Biaxially-oriented polyethylene multilayer film with a matte surface

Abstract

A biaxially-oriented polyethylene (BOPE) multilayer film comprises a skin layer with a matte surface and a core, the skin layer with a matte surface comprising, in weight percent (wt %) based upon the weight of the skin layer: (1) from 20 to 80 wt % of an ethylene-based polymer, and (2) from 80 to 20 wt % of a propylene-based polymer; each of the ethylene-based polymer and the propylene-based polymer having a storage modulus, with a difference between the storage modulus of the ethylene-based polymer and the propylene-based polymer of greater than 40 megaPascals (MPa) at 110° C., and greater than 18 MPa at 120° C.

Claims

1. A biaxially-oriented polyethylene (BOPE) multilayer film comprising a skin layer with a matte surface and a core, the core comprising one or more layers, the film characterized by the following: (A) the skin layer with a matte surface comprising, in weight percent (wt %) based upon the weight of the skin layer: (1) from 20 to 80 wt % of one or more ethylene-based polymers, each ethylene-based polymer having a density from 0.870 g/cc to 0.930 g/cc, and (2) from 80 to 20 wt % of a propylene-based polymer; each of the ethylene-based polymer and the propylene-based polymer having a storage modulus, with a difference between the storage modulus of the ethylene-based polymer and the propylene-based polymer of greater than 40 MPa at 110° C., and greater than 18 MPa at 120° C.; (B) the matte surface of the skin layer has a gloss of less than 50% as measured by ASTM D2457 at an angle of 45°; (C) the core comprising at least 50 wt % of an ethylene-based polymer based on the weight of all of the core layers; (D) the film having a thickness, and the core comprising at least 50% of the film thickness; and (E) the film is oriented in the machine direction at a draw ratio from 2:1 to 6:1, and in the cross direction from 2:1 to 11:1.

2. The BOPE multilayer film of claim 1 in which the difference between the storage modulus of the ethylene-based polymer and the propylene-based polymer is greater than 50 MPa at 110° C., and greater than 50 MPa at 120° C.

3. The BOPE multilayer film of claim 1 in which the ethylene-based polymer of the skin layer with a matte surface is a linear low density polyethylene (LLDPE).

4. The BOPE multilayer film of claim 1 in which the propylene-based polymer of the skin layer with a matte surface is one or more of a propylene random copolymer and a propylene-ethylene-butene terpolymer.

5. The BOPE multilayer film of claim 1 comprising two skin layers, one of which has a matte surface with a gloss of less than 50%, and the other of which has a gloss of 50% or greater.

6. The BOPE multilayer film of claim 1 in which the matte surface of the skin layer has a haze of greater than 50% as measured by ASTM D1003.

7. The BOPE multilayer film of claim 1 wherein the core comprises a plurality of layers comprising more than one core layer.

8. The BOPE multilayer film of claim 1 wherein the core comprises at least 3 layers comprising at least 3 core layers.

9. The BOPE multilayer film of claim 1 wherein the skin layer with a matte surface directly contacts the core; and the core comprises from 50 wt % to 100 wt % of the ethylene-based polymer, based on the weight of all of the core layers.

10. The BOPE multilayer film of claim 1 wherein the skin layer with a matte surface comprises an ethylene/C.sub.4-C.sub.8 α-olefin copolymer; a propylene/ethylene copolymer, having a difference in storage modulus from 100 MPa to 130 MPa at 110° C., and from 70 MPa to 80 MPa at 120° C.; and the matte surface of the skin layer has (i) a gloss from 3% to 15% and (ii) a haze from 70% to 90%.

11. The BOPE multilayer film of claim 10 wherein the skin layer with a matte surface comprises a single ethylene-based polymer that is a single ethylene/C.sub.4-C.sub.8 α-olefin copolymer; and a single propylene-based polymer that is a single propylene/ethylene copolymer.

12. The BOPE multilayer film of claim 1 wherein the skin layer with a matte surface comprises an ethylene/C.sub.4-C.sub.8 α-olefin copolymer; a propylene/ethylene/butene terpolymer, having a difference in storage modulus from greater than 40 MPa to 50 MPa, and from greater than 18 MPa to 20 MPa at 120° C.; and the matte surface of the skin layer has (i) a gloss from 15% to 19% and (ii) a haze from greater than 50% to 55%.

13. The BOPE multilayer film of claim 12 wherein the skin layer with a matte surface comprises a single ethylene-based polymer that is a single ethylene/C.sub.4-C.sub.8α-olefin copolymer; and a single propylene-based polymer that is a single propylene/ethylene/butene terpolymer.

14. The BOPE multilayer film of claim 1 comprising at least two core layers, each core layer composed of the same ethylene-based polymer.

15. The BOPE multilayer film of claim 14 wherein the ethylene-based polymer in the skin layer with a matte surface and the ethylene-based polymer in each core layer is the same ethylene-based polymer.

16. The BOPE multilayer film of claim 1 wherein the one or more ethylene-based polymers in the skin layer with a matte surface consist of one or more ethylene-based polymers having a density from 0.870 g/cc to 0.930 g/cc.

17. The BOPE multilayer film of claim 1 wherein each ethylene-based polymer in the film contains greater than 50 weight percent polymerized ethylene monomer and a comonomer.

18. The BOPE multilayer film of claim 17 wherein each propylene-based polymer in the BOPE film contains greater than 50 weight percent polymerized propylene monomer and at least one comonomer.

19. A package comprising the BOPE multilayer film of claim 1.

Description

DETAILED DESCRIPTION

(1) The present disclosure provides a biaxially-oriented polyethylene (BOPE) multilayer film. The BOPE multilayer film includes (i) a skin layer with a matte surface and (ii) a core. The core contains one or more layers, and the core contains at least 50 wt % of an ethylene-based polymer, based on the weight of all of the core layers. The skin layer with a matte surface contains from 20 wt % to 80 wt % of an ethylene-based polymer and from 20 wt % to 80 wt % of a propylene-based polymer, based on the total weight of the skin layer; and each of the ethylene-based polymer and the propylene-based polymer has a storage modulus, with a difference between the storage modulus of the ethylene-based polymer and the propylene-based polymer of greater than 40 megaPascals (MPa) at 110° C. and greater than 18 MPa at 120° C. The matte surface of the skin layer has a gloss of less than 50%. The film has a thickness, and the core is at least 50% of the film thickness. The film is oriented in the machine direction at a draw ratio from 2:1 to 6:1, and in the cross direction at a draw ratio from 2:1 to 11:1.

(2) The BOPE multilayer film contains two layers (i.e., the skin layer and one core layers), or more than three layers. For example, the multilayer film can have two, or three, four, five, six, seven, eight, nine, ten, eleven, or more layers. In an embodiment, the multilayer film contains only two layers, or only three layers, or only four layers, or only five layers.

(3) In an embodiment the BOPE multilayer film contains, consists essentially of, or consists of: (i) two skin layers and (ii) one or more core layers. In another embodiment, the BOPE multilayer film contains, consists essentially of, or consists of: (i) two skin layers and (ii) three core layers.

(4) The BOPE multilayer film is oriented in the machine direction at a draw ratio from 2:1 to 6:1, and in the cross direction at a draw ratio from 2:1 to 11:1. In an embodiment, the BOPE multilayer film is oriented in the machine direction at a draw ratio from 2:1, or 3:1, or 4:1 to 5:1, or 6:1; or from 2:1 to 5:1, or from 4:1 to 6:1, or from 4:1 to 5:1. In an embodiment, the BOPE multilayer film is oriented in the cross direction at a draw ratio from 2:1, or 3:1, or 4:1, or 6:1, or 8:1 to 9:1, or 10:1, or 11:1; or from 2:1 to 10:1, or from 2:1 to 9:1, or from 4:1 to 11:1, or from 6:1 to 11:1, or from 8:1 to 11:1, or from 8:1 to 9:1.

(5) In an embodiment, the BOPE multilayer film has an overall draw ratio (draw ratio in machine direction times the draw ratio in cross direction) of from 8, or 9, or 10, or 20, or 30, or 32 to 36, or 40, or 45, or 50, or 54, or 60, or 66; and the ratio of the draw ratio in the machine direction to the draw ratio in the cross direction is from 1.0:1.0, or 1.0:1.5 to 1.0:2.0, or 1.0:2.5, or 1.0:3.0, or 1.0:1.35, or 1.0:4.0, or 1.0:4.5, or 1.0:5.0, or 1.0:5.5.

(6) In an embodiment, the BOPE multilayer film is oriented in the machine direction at a draw ratio from 3:1 to 5:1 and in the cross direction at a draw ratio from 3:1 to 9:1. In addition, the BOPE multilayer film has an overall draw ratio (draw ratio in machine direction times the draw ratio in cross direction) of from 9 to 45, and the ratio of the draw ratio in the machine direction to the draw ratio in the cross direction is from 1.0:1.5 to 1.0:2.0.

(7) The BOPE multilayer film has a thickness. In an embodiment, the BOPE multilayer film has a thickness from 10 μm, or 20 μm, or 30 am to 50 μm, or 80 μm, or 100 μm, or 200 μm, or 300 μm, or 400 am, or 500 μm, or 750 μm, or 1000 μm, or 1500 μm, or 2000 μm, or 3000 μm. In another embodiment, the BOPE multilayer film has a thickness from 10 μm to 3000 μm, or from 10 am to 100 μm, or from 10 am to 1000 μm, or from 500 am to 1500 μm.

(8) The core is at least 50% of the film thickness. In an embodiment, the total thickness of the core (containing one or more layers) is from 50%, or 60%, or 70%, or 80%, or 90% to 95%, or 98% of the total thickness of the BOPE multilayer film. In another embodiment, the total thickness of the core (containing one or more layers) is from 50% to 98%, or from 60% to 95%, or from 70% to 95%, or from 80% to 95%, or from 90% to 95%, or from 70% to 90% of the total thickness of the BOPE multilayer film.

(9) In an embodiment, the skin layer with a matte surface is from 1%, or 2%, or 5% to 10%, or 20%, or 30%, or 40%, or 50% of the total thickness of the BOPE multilayer film. In another embodiment, the skin layer with a matte surface is from 1% to 50%, or from 2% to 50%, or from 5% to 40%, or from 5% to 30%, or from 5% to 20%, or from 5% to 10%, or from 10% to 30%, of the total thickness of the BOPE multilayer film.

(10) Skin Layer

(11) The BOPE multilayer film includes (i) a skin layer with a matte surface and (ii) a core. The skin layer with a matte surface contains from 20 wt % to 80 wt % of an ethylene-based polymer and from 20 wt % to 80 wt % of a propylene-based polymer, based on the total weight of the skin layer; and each of the ethylene-based polymer and the propylene-based polymer has a storage modulus, with a difference between the storage modulus of the ethylene-based polymer and the propylene-based polymer of greater than 40 megaPascals (MPa) at 110° C. and greater than 18 MPa at 120° C. The matte surface of the skin layer has a gloss of less than 50%.

(12) The BOPE multilayer film includes at least one skin layer. In an embodiment, the BOPE multilayer film contains one and only one skin layer. In another embodiment, the BOPE multilayer film contains two skin layers.

(13) The skin layer has two opposing surfaces. In an embodiment, the skin layer is a continuous layer with two opposing surfaces.

(14) At least one surface of the skin layer is a matte surface having a gloss of less than 50%. In an embodiment, each surface of the skin layer is a matte surface having a gloss of less than 50%. The matte surface is an outermost surface of the multilayer film.

(15) The BOPE multilayer film contains at least one skin layer with a matte surface having a gloss of less than (<) 50%, or less than 40%, or less than 20%. In an embodiment, the BOPE multilayer film includes at least one skin layer with a matte surface having a gloss from 0%, or 1%, or 2%, or 3%, or 4% to 10%, or 15%, or 18%, or 19%, or 20%, or 30%, or 40%, or less than 50%; or from 0% to less than 50%, or from 1% to 30%, or from 1% to 20%, or from 4% to 19%.

(16) In an embodiment, the BOPE multilayer film has two skin layers of which one skin layer has a matte surface with a gloss of less than 50%, or less than 40%, or less than 20%. In another embodiment, the BOPE multilayer film has two skin layers of which both skin layers have a matte surface with a gloss of less than 50%, or less than 40%, or less than 20%.

(17) In an embodiment, the BOPE multilayer film contains at least one skin layer with a matte surface having a haze of greater than 50%, or greater than 70%, or greater than 80%. In another embodiment, the BOPE multilayer film contains at least one skin layer with a matte surface having a haze from greater than 50%, or 51%, or 60%, or 70%, or 80% to 88%, or 90%, or 95%, or 100%; or from greater than 50% to 100%, or from 51% to 100%, or from 51% to 90%.

(18) In an embodiment, the BOPE multilayer film has two skin layers of which one skin layer has a matte surface with a haze of greater than 50%, or greater than 70%, or greater than 80%. In another embodiment, the BOPE multilayer film has two skin layers of which both skin layers have a matte surface with a haze of greater than 50%, or greater than 70%, or greater than 80%.

(19) In an embodiment, the skin layer with a matte surface has a thickness from 1 μm, or 2 μm, or 5 μm, or 8 μm, or 10 μm to 15 μm, or 20 am, or 50 μm, or 100 μm, or 200 μm, or 500 μm, or 750 μm, or 1000 μm, or 1500 μm. In another embodiment, the skin layer with a matte surface has a thickness from 1 μm to 1500 μm, or from 1 μm to 100 μm, or from 1 μm to 50 μm, or from 1 μm to 20 μm, or from 5 μm to 10 μm.

(20) Ethylene-Based Polymer

(21) The skin layer with a matte surface contains (i) from 20 wt % to 80 wt % of an ethylene-based polymer; and (ii) from 20 wt % to 80 wt % of a propylene-based polymer, based on the total weight of the skin layer.

(22) Nonlimiting examples of suitable ethylene-based polymer include Ziegler-Natta catalyzed linear low density polyethylene, single site catalyzed (including metallocene) linear low density polyethylene, and medium density polyethylene (MDPE), high density polyethylene (HDPE), and low density polyethylene (LDPE), as well as combinations of two or more of the foregoing. Exemplary commercially available ethylene-based polymers include low density polyethylene (LDPE, e.g., LDPE having a density from 0.917 to 0.924 g/cc and a melt index (I2) of from 0.2 to 75 g/10 min available from The Dow Chemical Company), linear low density polyethylene (LLDPE, e.g., DOWLEX™ made by The Dow Chemical Company with a typical density between about 0.915 and 0.940 g/cc and a typical I2 between about 0.5 and 30 g/10 min), homogeneously branched, linear ethylene/alpha-olefin copolymers (e.g., TAFMER™ polymers by Mitsui Chemicals America, Inc. and EXACT™ polymers by ExxonMobil Chemical (ExxonMobil)), homogeneously branched, substantially linear ethylene/alpha-olefin polymers (e.g., AFFINITY™ and ENGAGE™ polymers commercially available from The Dow Chemical Company olefin block copolymers (e.g., INFUSE™ which are commercially available from The Dow Chemical Company, and high pressure, free radical polymerized ethylene copolymers such as ethylene/vinyl acetate (EVA) and ethylene/acrylate and ethylene/methacrylate polymers (e.g., ELVAX™ and ELVALOY™ polymers, respectively, commercially available from E. I. Du Pont du Nemours & Co. (Du Pont)) and ethylene/acrylic (EAA) and ethylene/methacrylic acid (EMAA) polymers (e.g., PRIMACOR™ EAA polymers commercially available from SK Global Chemical and NUCREL™ EMAA polymers commercially available from Du Pont). Nonlimiting examples of suitable ethylene-based polymer also include ethylene/α-olefin interpolymer and ethylene/α-olefin copolymer. Nonlimiting examples of suitable α-olefins include C.sub.3-C.sub.20 α-olefins, or C.sub.4-C.sub.20 α-olefins, or C.sub.3-C.sub.10 α-olefins, or C.sub.4-C.sub.10 α-olefins, or C.sub.4-C.sub.8 α-olefins. Representative α-olefins include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene and 1-octene.

(23) In an embodiment, the ethylene-based polymer is a LLDPE.

(24) In an embodiment, the ethylene-based polymer is an ethylene/α-olefin copolymer. The ethylene/α-olefin copolymer contains, consists essentially of, or consists of: (i) ethylene and (ii) C.sub.3-C.sub.20, or C.sub.4-C.sub.20, or C.sub.3-C.sub.10, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8, or C.sub.8 α-olefin comonomer.

(25) In an embodiment, the ethylene-based polymer is an ethylene/octene copolymer. The ethylene/octene copolymer contains, consists essentially of, or consists of (i) ethylene and (ii) octene comonomer.

(26) In an embodiment, the ethylene-based polymer contains greater than 50 wt % units derived from ethylene, or from 51 wt %, or 55 wt %, or 60 wt % to 70 wt %, or 80 wt %, or 90 wt %, or 95 wt %, or 99 wt %, or 100 wt % units derived from ethylene; and a reciprocal amount of units derived from an α-olefin comonomer, or from less than 50 wt %, or 49 wt %, or 45 wt %, or 40 wt % to 30 wt %, or 20 wt %, or 10 wt %, or 5 wt %, or 1 wt %, or 0 wt % units derived from an α-olefin comonomer, based on the weight of the ethylene-based polymer.

(27) In an embodiment, the ethylene-based polymer has a density from 0.870 g/cc, or 0.885 g/cc, or 0.900 g/cc, or 0.905 g/cc, or 0.910 g/cc to 0.926 g/cc, or 0.930 g/cc, or 0.940 g/cc, or 0.950 g/cc, or 0.960 g/cc. In another embodiment, the ethylene-based polymer has a density from 0.870 g/cc to 0.960 g/cc, or from 0.900 g/cc to 0.960 g/cc, or from 0.910 g/cc to 0.930 g/cc.

(28) In an embodiment, the ethylene-based polymer has a melt index (I.sub.2) from 0.1 g/10 min, or 1.0 g/10 min to 2.0 g/10 min, or 5.0 g/10 min, or 10 g/10 min, or 15 g/10 min, or 20 g/10 min, or 30 g/10 min, or 40 g/10 min, or 50 g/10 min. In another embodiment, the ethylene-based polymer has a melt index (I.sub.2) from 0.1 g/10 min to 50 g/10 min, or from 0.1 g/10 min to 20 g/10 min, or from 1 g/10 min to 15 g/10 min.

(29) In an embodiment, the ethylene-based polymer has a storage modulus at 110° C. from greater than 0 MPa, or 0.01 MPa to 23 MPa, or 25 MPa, or 30 MPa. In another embodiment, the ethylene-based polymer has a storage modulus at 110° C. from greater than 0 MPa to 30 MPa, or from 0.01 MPa to 25 MPa, or from 0.01 MPa to 23 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa.

(30) In an embodiment, the ethylene-based polymer has a storage modulus at 120° C. from greater than 0 MPa, or 0.01 MPa to 8 MPa, or 10 MPa, or 15 MPa, or 20 MPa. In another embodiment, the ethylene-based polymer has a storage modulus at 120° C. from greater than 0 MPa to 20 MPa, or from 0.01 MPa to 15 MPa, or from 0.01 MPa to 10 MPa, or from 0.01 MPa to 8 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa.

(31) In an embodiment, the ethylene-based polymer is an ethylene/α-olefin copolymer containing, consisting essentially of, or consisting of: (i) ethylene and (ii) C.sub.3-C.sub.20, or C.sub.4-C.sub.20, or C.sub.3-C.sub.10, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8, or C.sub.8 α-olefin comonomer. The ethylene/α-olefin copolymer has one, some, or all of the following properties: (a) a density from 0.870 g/cc to 0.960 g/cc, or from 0.900 g/cc to 0.960 g/cc, or from 0.910 g/cc to 0.930 g/cc; and/or (b) a melt index (I.sub.2) from 0.1 g/10 min to 50 g/10 min, or from 0.1 g/10 min to 20 g/10 min, or from 1 g/10 min to 15 g/10 min; and/or (c) a storage modulus at 110° C. from greater than 0 MPa to 30 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa; and/or (d) a storage modulus at 120° C. from greater than 0 MPa to 20 MPa, or from greater than 0 MPa to 15 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa.

(32) In an embodiment, the ethylene-based polymer is an ethylene/α-olefin copolymer containing, consisting essentially of, or consisting of: (i) ethylene and (ii) C.sub.3-C.sub.20, or C.sub.4-C.sub.20, or C.sub.3-C.sub.10, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8, or C.sub.8 α-olefin comonomer. The ethylene/α-olefin copolymer has one, some, or all, of the following properties: (a) a density from 0.870 g/cc to 0.960 g/cc, or from 0.900 g/cc to 0.960 g/cc, or from 0.910 g/cc to 0.930 g/cc, or from 0.910 g/cc to 0.915 g/cc; and/or (b) a melt index (I.sub.2) from 0.1 g/10 min to 50 g/10 min, or from 1 g/10 min to 20 g/10 min, or from 10 g/10 min to 15 g/10 min; and/or (c) a storage modulus at 110° C. from greater than 0 MPa to 30 MPa, or from 0.01 MPa to 25 MPa, or from 10 MPa to 25 MPa, or from 20 MPa to 23 MPa; and/or (d) a storage modulus at 120° C. from greater than 0 MPa to 20 MPa, or from 0.01 MPa to 15 MPa, or from 5 MPa to 10 MPa, or from 6 MPa to 8 MPa.

(33) In an embodiment, ethylene-based polymer is a LLDPE that is an ethylene/α-olefin copolymer containing, consisting essentially of, or consisting of: (i) ethylene and (ii) C.sub.3-C.sub.20, or C.sub.4-C.sub.20, or C.sub.3-C.sub.10, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8, or C.sub.8 α-olefin comonomer. The LLDPE has one, some, or all, of the following properties: (a) a density from 0.870 g/cc to 0.960 g/cc, or from 0.915 g/cc to 0.940 g/cc, or from 0.920 g/cc to 0.930 g/cc, or from 0.925 g/cc to 0.930 g/cc; and/or (b) a melt index (I.sub.2) from 0.1 g/10 min to 30 g/10 min, or from 0.1 g/10 min to 10 g/10 min, or from 0.1 g/10 min to 2 g/10 min; and/or (c) a storage modulus at 110° C. from greater than 0 MPa to 30 MPa, or from 0.01 MPa to 25 MPa, or from 10 MPa to 25 MPa, or from 20 MPa to 23 MPa; and/or (d) a storage modulus at 120° C. from greater than 0 MPa to 20 MPa, or from 0.01 MPa to 15 MPa, or from 5 MPa to 10 MPa, or from 6 MPa to 8 MPa.

(34) The skin layer with a matte surface may contain more than one ethylene-based polymer. In an embodiment, the skin layer with a matte surface includes at least two ethylene-based polymers, wherein each ethylene-based polymer differs from one another compositionally, structurally, and/or physically. For example, the skin layer with a matte surface may contain an LLDPE and a LDPE.

(35) The ethylene-based polymer may comprise two or more embodiments disclosed herein.

(36) Propylene-Based Polymer

(37) The skin layer with a matte surface contains (i) from 20 wt % to 80 wt % of the ethylene-based polymer; and (ii) from 20 wt % to 80 wt % of a propylene-based polymer, based on the total weight of the skin layer.

(38) Nonlimiting examples of suitable propylene-based polymers include ethylene/propylene copolymers, butylene/propylene copolymers, propylene-ethylene-butylene terpolymers and polypropylene homopolymers, as well as combinations of two or more of the foregoing. Exemplary commercially available propylene-based polymers include TOPILENE™ PPR R200P from Hyosung Corporation, TF451 from Hanwha Total, BOREALIS™ PP RD208CF, and VERSIFY™ from The Dow Chemical Company.

(39) In an embodiment, the propylene-based polymer is selected from propylene/α-olefin random copolymer, propylene/ethylene/butylene terpolymer, and combinations thereof.

(40) In an embodiment, the propylene-based polymer is a propylene/α-olefin copolymer. The propylene/α-olefin copolymer contains, consists essentially of, or consists of: (i) propylene and (ii) C.sub.2, or C.sub.4-C.sub.20, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8 α-olefin comonomer.

(41) In an embodiment, the propylene-based polymer is a propylene-ethylene-butylene terpolymer containing, consisting essentially of, or consisting of: (i) propylene, (ii) ethylene comonomer, and (iii) butylene comonomer.

(42) In an embodiment, the propylene-based polymer contains greater than 50 wt % units derived from propylene, or from 51 wt %, or 55 wt %, or 60 wt % to 70 wt %, or 80 wt %, or 90 wt %, or 95 wt %, or 99 wt %, or 100 wt % units derived from propylene; and a reciprocal amount of units derived from an α-olefin comonomer, or from less than 50 wt %, or 49 wt %, or 45 wt %, or 40 wt % to 30 wt %, or 20 wt %, or 10 wt %, or 5 wt %, or 1 wt %, or 0 wt % units derived from an α-olefin comonomer, based on the weight of the propylene-based polymer.

(43) In an embodiment, the propylene-based polymer has a density from 0.895 g/cc, or 0.900 g/cc to 0.910 g/cc, or 0.915 g/cc, or 0.920 g/cc, or 0.930 g/cc, or 0.940 g/cc, or 0.950 g/cc. In another embodiment, the propylene-based polymer has a density from 0.895 g/cc to 0.950 g/cc, or from 0.895 g/cc to 0.920 g/cc, or from 0.895 g/cc to 0.915 g/cc, or from 0.900 g/cc to 0.910 g/cc.

(44) In an embodiment, the propylene-based polymer has a melt flow rate from 0.01 g/10 min, or 0.10 g/10 min, or 0.20 g/10 min to 7 g/10 min, or 10 g/10 min, or 15 g/10 min, or 20 g/10 min, or 30 g/10 min. In another embodiment, the propylene-based polymer has a melt flow rate from 0.01 g/10 min to 30 g/10 min, or from 0.01 g/10 min to 15 g/10 min, or from 0.10 g/10 min to 10 g/10 min.

(45) In an embodiment, the propylene-based polymer has a storage modulus at 110° C. from greater than 40 MPa, or 45 MPa, or 49 MPa, or 50 MPa, or 70 MPa, or 80 MPa, or 100 MPa, or 120 MPa to 125 MPa, or 130 MPa, or 140 MPa, or 150 MPa. In another embodiment, the propylene-based polymer has a storage modulus at 110° C. from greater than 40 MPa to 150 MPa, or from 45 MPa to 140 MPa, or from 45 MPa to 130 MPa.

(46) In an embodiment, the propylene-based polymer has a storage modulus at 120° C. from greater than 18 MPa, or 19 MPa, or 20 MPa, or 40 MPa, or 50 MPa, or 70 MPa, or 75 MPa to 80 MPa, or 90 MPa, or 100 MPa, or 120 MPa. In another embodiment, the propylene-based polymer has a storage modulus at 120° C. from greater than 18 MPa to 120 MPa, or from 19 MPa to 100 MPa, or from 19 MPa to 80 MPa.

(47) In an embodiment, the propylene-based polymer has one, some, or all of the following properties: (i) a density from 0.895 g/cc to 0.950 g/cc, or from 0.895 g/cc to 0.920 g/cc, or from 0.895 g/cc to 0.915 g/cc, or from 0.900 g/cc to 0.910 g/cc; and/or (ii) a melt flow rate from 0.01 g/10 min to 30 g/10 min, or from 0.01 g/10 min to 15 g/10 min, or from 0.10 g/10 min to 10 g/10 min; and/or (iii) a storage modulus at 110° C. from greater than 40 MPa to 150 MPa, or from 45 MPa to 140 MPa, or from 45 MPa to 130 MPa; and/or (iv) a storage modulus at 120° C. from greater than 18 MPa to 120 MPa, or from 19 MPa to 100 MPa, or from 19 MPa to 80 MPa.

(48) In an embodiment, the propylene-based polymer is a propylene/α-olefin random copolymer containing, consisting essentially of, or consisting of: (i) propylene and (ii) C.sub.2, or C.sub.4-C.sub.20, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8 α-olefin comonomer. The propylene/α-olefin random copolymer has one, some, or all of the following properties: (a) a density from 0.895 g/cc to 0.950 g/cc, or from 0.895 g/cc to 0.920 g/cc, or from 0.895 g/cc to 0.915 g/cc, or from 0.900 g/cc to 0.910 g/cc; and/or (b) a melt flow rate from 0.01 g/10 min to 30 g/10 min, or from 0.01 g/10 min to 15 g/10 min, or from 0.10 g/10 min to 10 g/10 min, or from 0.01 g/10 min to 1.0 g/10 min; and/or (c) a storage modulus at 110° C. from greater than 40 MPa to 150 MPa, or from 45 MPa to 140 MPa, or from 45 MPa to 130 MPa, or from 100 MPa to 150 MPa, or from 120 MPa to 130 MPa; and/or (d) a storage modulus at 120° C. from greater than 18 MPa to 120 MPa, or from 19 MPa to 100 MPa, or from 19 MPa to 80 MPa, or from 50 MPa to 120 MPa, or from 70 MPa to 80 MPa.

(49) In an embodiment, the propylene-based polymer is a propylene-ethylene-butylene terpolymer containing, consisting essentially of, or consisting of: (i) propylene, (ii) ethylene comonomer, and (iii) butylene comonomer. The propylene-ethylene-butylene terpolymer has one, some, or all of the following properties: (a) a density from 0.895 g/cc to 0.950 g/cc, or from 0.895 g/cc to 0.920 g/cc, or from 0.895 g/cc to 0.915 g/cc, or from 0.900 g/cc to 0.910 g/cc; and/or (b) a melt flow rate from 0.01 g/10 min to 30 g/10 min, or from 0.01 g/10 min to 15 g/10 min, or from 1 g/10 min to 10 g/10 min; and/or (c) a storage modulus at 110° C. from greater than 40 MPa to 150 MPa, or from 45 MPa to 100 MPa, or from 45 MPa to 60 MPa; and/or (d) a storage modulus at 120° C. from greater than 18 MPa to 120 MPa, or from 19 MPa to 80 MPa, or from 19 MPa to 30 MPa.

(50) The skin layer with a matte surface may contain more than one propylene-based polymer. In an embodiment, the skin layer with a matte surface includes at least two propylene-based polymers, wherein each propylene-based polymer differs from one another compositionally, structurally, and/or physically. For example, the skin layer with a matte surface may contain a propylene/α-olefin random copolymer and a propylene/ethylene/butylene terpolymer.

(51) The propylene-based polymer may comprise two or more embodiments disclosed herein.

(52) Each of the ethylene-based polymer and the propylene-based polymer has a storage modulus. The difference between the storage modulus of the ethylene-based polymer (SM.sub.PE) and the storage modulus of the propylene-based polymer (SM.sub.pp) in the skin layer with a matte surface (the “Δ Storage Modulus”) is greater than 40 MPa at 110° C., and greater than 18 MPa at 120° C. The Δ Storage Modulus is calculated in accordance with Equation (A):
ΔStorage Modulus=|SM.sub.PE−SM.sub.PP|  Equation (A).

(53) In an embodiment, the difference between the storage modulus of the ethylene-based polymer and the storage modulus of the propylene-based polymer (Δ Storage Modulus) at 110° C. is from greater than 40 MPa, or 45 MPa, or 49 MPa, or 50 MPa, or 75 MPa, or 100 MPa to 125 MPa, or 130 MPa, or 140 MPa, or 150 MPa. In another embodiment, the Δ Storage Modulus at 110° C. is from greater than 40 MPa to 150 MPa, or from 45 MPa to 130 MPa, or from 49 MPa to 125 MPa.

(54) In an embodiment, the difference between the storage modulus of the ethylene-based polymer and the storage modulus of the propylene-based polymer (Δ Storage Modulus) at 120° C. is from greater than 18 MPa, or 19 MPa, or 20 MPa, or 40 MPa, or 50 MPa, or 60 MPa, or 70 MPa to 80 MPa, or 85 MPa, or 90 MPa, or 100 MPa, or 110 MPa, or 120 MPa. In another embodiment, the Δ Storage Modulus at 120° C. is from greater than 18 MPa to 120 MPa, or from 19 MPa to 100 MPa, or from 19 MPa to 80 MPa.

(55) In an embodiment, (i) the Δ Storage Modulus at 110° C. is from greater than 40 MPa to 150 MPa, or from 45 MPa to 130 MPa, or from 49 MPa to 125 MPa; and (ii) the Δ Storage Modulus at 120° C. is from greater than 18 MPa to 120 MPa, or from 19 MPa to 100 MPa, or from 19 MPa to 80 MPa.

(56) In an embodiment, the skin layer with a matte surface contains, consists essentially of, or consists of: (i) from 20 wt % to 80 wt %, or from 40 wt % to 60 wt %, or from 50 wt % to 60 wt % of an ethylene-based polymer; and (ii) a reciprocal amount of propylene-based polymer, or from 20 wt % to 80 wt %, or from 40 wt % to 60 wt %, or from 40 wt % to 50 wt % of a propylene-based polymer, based on the total weight of the skin layer.

(57) It is understood that the sum of the components in each of the layers disclosed herein, including the foregoing layers, yields 100 weight percent (wt %), based on the total weight of each respective layer.

(58) In an embodiment, the skin layer with a matte surface contains a single, or one and only one, ethylene-based polymer.

(59) In an embodiment, the ethylene-based polymer is the only polymer containing ethylene monomer in the skin layer with a matte surface.

(60) In an embodiment, the skin layer with a matte surface contains a single, or one and only one, propylene-based polymer.

(61) In an embodiment, the propylene-based polymer is the only polymer containing propylene monomer in the skin layer with a matte surface.

(62) In an embodiment, the ethylene-based polymer and the propylene-based polymer are the only polymeric components in the skin layer.

(63) In an embodiment, the BOPE multilayer film contains at least one, or two, or one and only one, skin layer with a matte surface. The skin layer with a matte surface contains, consists essentially of, or consists of:

(64) (A) from 20 wt % to 80 wt %, or from 40 wt % to 60 wt %, or from 50 wt % to 60 wt % of an ethylene-based polymer that is an ethylene/α-olefin copolymer containing, consisting essentially of, or consisting of: (i) ethylene and (ii) C.sub.3-C.sub.20, or C.sub.4-C.sub.20, or C.sub.3-C.sub.10, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8, or C.sub.8 α-olefin comonomer; the ethylene/α-olefin copolymer having one, some, or all of the following properties: (a) a density from 0.870 g/cc to 0.960 g/cc, or from 0.900 g/cc to 0.960 g/cc, or from 0.910 g/cc to 0.930 g/cc; and/or (b) a melt index (I.sub.2) from 0.1 g/10 min to 50 g/10 min, or from 0.1 g/10 min to 20 g/10 min, or from 1 g/10 min to 15 g/10 min; and/or (c) a storage modulus at 110° C. from greater than 0 MPa to 30 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa; and/or (d) a storage modulus at 120° C. from greater than 0 MPa to 20 MPa, or from greater than 0 MPa to 15 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa; and

(65) (B) from 20 wt % to 80 wt %, or from 40 wt % to 60 wt %, or from 40 wt % to 50 wt % of a propylene-based polymer selected from propylene/α-olefin random copolymer, propylene/ethylene/butylene terpolymer, and combinations thereof, the propylene-based polymer having one, some, or all of the following properties: (i) a density from 0.895 g/cc to 0.950 g/cc, or from 0.895 g/cc to 0.920 g/cc, or from 0.895 g/cc to 0.915 g/cc, or from 0.900 g/cc to 0.910 g/cc; and/or (ii) a melt flow rate from 0.01 g/10 min to 30 g/10 min, or from 0.01 g/10 min to 15 g/10 min, or from 0.10 g/10 min to 10 g/10 min; and/or (iii) a storage modulus at 110° C. from greater than 40 MPa to 150 MPa, or from 45 MPa to 140 MPa, or from 45 MPa to 130 MPa; and/or (iv) a storage modulus at 120° C. from greater than 18 MPa to 120 MPa, or from 19 MPa to 100 MPa, or from 19 MPa to 80 MPa; and

(66) the skin layer with a matte surface has one, some, or all of the following properties: (i) a gloss from 0% to less than 50%, or from 1% to 30%, or from 1% to 20%, or from 4% to 19%; and/or (ii) a haze from greater than 50% to 100%, or from 51% to 100%, or from 51% to 90%; and/or (iii) a Δ Storage Modulus at 110° C. from greater than 40 MPa to 150 MPa, or from 45 MPa to 130 MPa, or from 49 MPa to 125 MPa; and/or (iv) a Δ Storage Modulus at 120° C. from greater than 18 MPa to 120 MPa, or from 19 MPa to 100 MPa, or from 19 MPa to 80 MPa; and/or (v) a thickness from 1 μm to 1500 μm, or from 1 μm to 100 μm, or from 1 μm to 50 μm, or from 1 μm to 20 μm, or from 5 μm to 10 μm.

(67) In those embodiments in which the BOPE multilayer film comprises two skin layers, the two skin layers can be the same or different. As long as one skin layer has a matte surface, then the composition of the other skin layer can vary to convenience. Typically, the other skin layer contains at least 50 wt % of one or more ethylene-based polymers.

(68) In an embodiment, the BOPE multilayer film includes (i) a first skin layer with a matte surface and (ii) a second skin layer containing, consisting essentially of, or consisting of an ethylene-based polymer. The ethylene-based polymer in the second skin layer may be the same or different than the ethylene-based polymer in the first skin layer with a matte surface. In an embodiment, the ethylene-based polymer in the second skin layer is different than the ethylene-based polymer in the first skin layer with a matte surface.

(69) In an embodiment, the ethylene-based polymer in the second skin layer is the same as the ethylene-based polymer in the first skin layer with a matter surface. In other words, each ethylene-based polymer has identical comonomer type, comonomer content, structure, and properties.

(70) The skin layer with a matte surface may comprise two or more embodiments disclosed herein.

(71) The skin layer may comprise two or more embodiments disclosed herein.

(72) Core

(73) The BOPE multilayer film includes (i) the skin layer with a matte surface and (ii) a core. The core contains one or more layers. The core contains at least 50 wt % of an ethylene-based polymer, based on the total weight of all of the core layers.

(74) Each core layer has two opposing surfaces. In an embodiment, each core layer is a continuous layer with two opposing surfaces.

(75) The BOPE multilayer film includes a core that contains at least one core layer. In one embodiment, the core of the BOPE multilayer film includes two or more core layers. The core of the BOPE multilayer film contains at least 50 wt %, or 60 wt %, or 70 wt %, or 80 wt %, or 90 wt %, or greater than 99 wt % ethylene-based polymer, e.g., a linear low density polyethylene. The amount of ethylene-based polymer in the core is based on the total weight of the core, and not on the weight of a single layer in the core. As such, in some embodiments, the BOPE multilayer film may contain one or more individual core layers in which the amount of ethylene-based polymer is less than 50 wt %, or is completely absent, based on the weight of the individual core layer, but in these embodiments the amount of ethylene-based polymer in the other layers of the core is sufficient such that the total amount of ethylene-based polymer in the core is at least 50 wt %.

(76) In an embodiment, the core contains from 50 wt %, or 60 wt %, or 70 wt %, or 80 wt %, or 90 wt % to 100 wt % ethylene-based polymer, based on the total weight of all of the core layers. In another embodiment, the core contains from 50 wt % to 100 wt %, or from 70 wt % to 100 wt %, or from 90 wt % to 100 wt % ethylene-based polymer, based on the total weight of all of the core layers.

(77) In an embodiment, the core consists essentially of, or consists of ethylene-based polymer. In other words, the core contains 100 wt % ethylene-based polymer, based on the total weigh of all the core layers.

(78) The ethylene-based polymer may be any ethylene-based polymer disclosed herein. In an embodiment, the ethylene-based polymers of the core layer or core layers are the same as those described for the skin layer with a matte surface. Any thermoplastic polymer compatible with the ethylene-based polymer, and that contributes to the desired properties of the BOPE multilayer film, can be used in combination with the ethylene-based polymer in any given core layer. Typical of such polymers are the propylene-based polymers described for the skin layer with a matte surface.

(79) In an embodiment, the BOPE multilayer film includes a core with from one, or two to three, or four, or five core layers. Each core layer may the same or different. In an embodiment, each core layer is structurally, compositionally, and/or physically the same. In another embodiment, each core layer is structurally, compositionally, and/or physically different.

(80) In an embodiment, the core has a thickness from 5 μm, or 10 μm, or 20 μm, or 30 μm to 40 μm, or 50 μm, or 100 μm, or 200 μm, or 300 μm, or 400 μm, or 500 μm, or 600 μm, or 700 μm, or 800 μm, or 900 μm, or 1000 μm, or 1200 μm, or 1500 μm, or 2000 μm, or 2500 μm, or 2900 μm, or less than 3000 μm. In another embodiment, the core has a thickness from 5 μm to less than 3000 μm, or from 5 μm to less than 1000 μm, or from 50 μm to less than 3000 μm, or from 500 am to 2000 μm, or from 500 μm to 1000 μm, or from 10 μm to 90 μm, or from 20 μm to 80 μm.

(81) In an embodiment, the BOPE multilayer film includes a core with from one, or two to three, or four, or five core layers. Each core layer contains, consists essentially of, or consists of an ethylene-based polymer that is an ethylene/α-olefin copolymer containing, consisting essentially of, or consisting of: (i) ethylene and (ii) C.sub.3-C.sub.20, or C.sub.4-C.sub.20, or C.sub.3-C.sub.10, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8, or C.sub.8 α-olefin comonomer. The ethylene/α-olefin copolymer has one, some, or all of the following properties: (a) a density from 0.870 g/cc to 0.960 g/cc, or from 0.900 g/cc to 0.960 g/cc, or from 0.910 g/cc to 0.930 g/cc; and/or (b) a melt index (I.sub.2) from 0.1 g/10 min to 50 g/10 min, or from 0.1 g/10 min to 20 g/10 min, or from 1 g/10 min to 15 g/10 min; and/or (c) a storage modulus at 110° C. from greater than 0 MPa to 30 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa; and/or (d) a storage modulus at 120° C. from greater than 0 MPa to 20 MPa, or from greater than 0 MPa to 15 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa. The core contains from 50 wt % to 100 wt %, or from 70 wt % to 100 wt %, or from 90 wt % to 100 wt %, or 100 wt % ethylene-based polymer, based on the total weigh of all the core layers. The core has a thickness from 5 μm to less than 3000 μm, or from 5 μm to less than 1000 μm, or from 50 μm to less than 3000 μm, or from 500 μm to 2000 μm, or from 500 μm to 1000 μm, or from 10 μm to 90 μm, or from 20 μm to 80 μm.

(82) In an embodiment, the core contains a single, or one and only one, ethylene-based polymer.

(83) In an embodiment, the ethylene-based polymer is the only polymer containing ethylene monomer in the core.

(84) In an embodiment, the ethylene-based polymer of the core is the same or different than the ethylene-based polymer of the skin layer. In an embodiment, the ethylene-based polymer of the core is different than the ethylene-based polymer of the skin layer.

(85) In an embodiment, the ethylene-based polymer of the core is the same as the ethylene-based polymer of the skin layer. In other words, the ethylene-based polymer of the core and the ethylene-based polymer of the skin layer each has identical comonomer type, comonomer content, structure, and properties.

(86) In one embodiment the overall content of ethylene-based polymer in the BOPE multilayer film is at least 50 wt %, or 60 wt %, or 70 wt %, or 80 wt %, or 90 wt % or more. However, the weight percent of ethylene-based polymer in the core of the BOPE multilayer film may exceed the weight percent of ethylene-based polymer in the BOPE multilayer film itself due to the presence of propylene-based polymer in the skin layer(s).

(87) The core may comprise two or more embodiments disclosed herein.

(88) Additives

(89) In an embodiment, the BOPE multilayer film contains (i) the skin layer containing ethylene-based polymer and propylene-based polymer, and (ii) the core containing ethylene-based polymer, and one or both of the skin layer and the core contains one or more additives.

(90) The additives are used in known amounts and in known ways, and include, without limitation, antioxidants, ultraviolet light stabilizers, thermal stabilizers, slip agents, antiblock agents, pigments or colorants, processing aids, crosslinking catalysts, flame retardants, fillers and foaming agents. The additives can be included in one or more of the skin and core layers.

(91) In an embodiment, the BOPE multilayer film is void of, or substantially void of, metal oxide (such as titanium dioxide).

(92) In an embodiment, the BOPE multilayer film is void of, or substantially void of, silicon dioxide.

(93) In an embodiment, the overall content of ethylene-based polymer in the BOPE multilayer film is from 50 wt %, or 60 wt %, or 70 wt %, or 80 wt %, or 90 wt % to 95 wt %, or 98 wt %, or 99 wt %, based on the total weight of the BOPE multilayer film. In another embodiment, the overall content of ethylene-based polymer in the BOPE multilayer film is from 50 wt % to 99 wt %, or from 60 wt % to 98 wt %, or from 80 wt % to 98 wt %, based on the total weight of the BOPE multilayer film.

(94) The core is in contact with the skin layer with a matte surface. The core layer may be in direct contact or in indirect contact with the skin layer with a matte surface. In an embodiment, the core directly contacts the skin layer with a matte surface. The term “directly contacts,” as used herein, is a layer configuration whereby the core is located immediately adjacent to the skin layer with a matte surface and no intervening layers, or no intervening structures, are present between the core and the skin layer with a matte surface.

(95) In another embodiment, the core indirectly contacts the skin layer with a matte surface and no intervening layers. The term “indirectly contacts,” as used herein, is a layer configuration whereby an intervening layer, or an intervening structure, is present between the core and the skin layer with a matte surface and no intervening layers.

(96) In an embodiment, the BOPE multilayer film contains, consists essentially of, or consists of:

(97) (A) from one to two, or one and only one, skin layer with a matte surface, the skin layer with a matte surface containing, consisting essentially of, or consisting of: (i) from 20 wt % to 80 wt %, or from 40 wt % to 60 wt %, or from 50 wt % to 60 wt % of a first ethylene-based polymer that is a first ethylene/α-olefin copolymer containing, consisting essentially of, or consisting of ethylene and C.sub.3-C.sub.20, or C.sub.4-C.sub.20, or C.sub.3-C.sub.10, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8, or C.sub.8 α-olefin comonomer; the first ethylene/α-olefin copolymer having one, some, or all of the following properties: (a) a density from 0.870 g/cc to 0.960 g/cc, or from 0.900 g/cc to 0.960 g/cc, or from 0.910 g/cc to 0.930 g/cc; and/or (b) a melt index (I.sub.2) from 0.1 g/10 min to 50 g/10 min, or from 0.1 g/10 min to 20 g/10 min, or from 1 g/10 min to 15 g/10 min; and/or (c) a storage modulus at 110° C. from greater than 0 MPa to 30 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa; and/or (d) a storage modulus at 120° C. from greater than 0 MPa to 20 MPa, or from greater than 0 MPa to 15 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa; and (ii) from 20 wt % to 80 wt %, or from 40 wt % to 60 wt %, or from 40 wt % to 50 wt % of a propylene-based polymer selected from propylene/α-olefin random copolymer, propylene/ethylene/butylene terpolymer, and combinations thereof, the propylene-based polymer having one, some, or all of the following properties: (i) a density from 0.895 g/cc to 0.950 g/cc, or from 0.895 g/cc to 0.920 g/cc, or from 0.895 g/cc to 0.915 g/cc, or from 0.900 g/cc to 0.910 g/cc; and/or (ii) a melt flow rate from 0.01 g/10 min to 30 g/10 min, or from 0.01 g/10 min to 15 g/10 min, or from 0.10 g/10 min to 10 g/10 min; and/or (iii) a storage modulus at 110° C. from greater than 40 MPa to 150 MPa, or from 45 MPa to 140 MPa, or from 45 MPa to 130 MPa; and/or (iv) a storage modulus at 120° C. from greater than 18 MPa to 120 MPa, or from 19 MPa to 100 MPa, or from 19 MPa to 80 MPa;

(98) (B) a core containing from one, or two to three, or four, or five core layers, wherein each core layer contains, consists essentially of, or consists of a second ethylene-based polymer that is a second ethylene/α-olefin copolymer containing, consisting essentially of, or consisting of ethylene and C.sub.3-C.sub.20, or C.sub.4-C.sub.20, or C.sub.3-C.sub.10, or C.sub.4-C.sub.10, or C.sub.4-C.sub.8, or C.sub.8 α-olefin comonomer, the second ethylene/α-olefin copolymer has one, some, or all of the following properties: (a) a density from 0.870 g/cc to 0.960 g/cc, or from 0.900 g/cc to 0.960 g/cc, or from 0.910 g/cc to 0.930 g/cc; and/or (b) a melt index (I.sub.2) from 0.1 g/10 min to 50 g/10 min, or from 0.1 g/10 min to 20 g/10 min, or from 1 g/10 min to 15 g/10 min; and/or (c) a storage modulus at 110° C. from greater than 0 MPa to 30 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa; and/or (d) a storage modulus at 120° C. from greater than 0 MPa to 20 MPa, or from greater than 0 MPa to 15 MPa, or from greater than 0 MPa to 10 MPa, or from greater than 0 MPa to 5 MPa, or from greater than 0 MPa to 1 MPa; and

(99) the skin layer with a matte surface has (i) a Δ Storage Modulus at 110° C. from greater than 40 MPa to 150 MPa, or from 45 MPa to 130 MPa, or from 49 MPa to 125 MPa; and (ii) a Δ Storage Modulus at 120° C. from greater than 18 MPa to 120 MPa, or from 19 MPa to 100 MPa, or from 19 MPa to 80 MPa;

(100) the skin layer with a matte surface has a gloss from 0% to less than 50%, or from 1% to 30%, or from 1% to 20%, or from 4% to 19%;

(101) the core contains from 50 wt % to 100 wt %, or from 70 wt % to 100 wt %, or from 90 wt % to 100 wt %, or 100 wt % ethylene-based polymer, based on the total weigh of all the core layers;

(102) the total thickness of the core (containing one or more layers) is from 50% to 98%, or from 60% to 95%, or from 70% to 95%, or from 80% to 95%, or from 90% to 95%, or from 70% to 90% of the total thickness of the BOPE multilayer film;

(103) the BOPE multilayer film is oriented in the machine direction at a draw ratio from 2:1 to 6:1, or from 2:1 to 5:1, or from 4:1 to 6:1, or from 4:1 to 5:1;

(104) the BOPE multilayer film is oriented in the cross direction at a draw ratio from 2:1 to 11:1, or from 2:1 to 10:1, or from 2:1 to 9:1, or from 4:1 to 11:1, or from 6:1 to 11:1, or from 8:1 to 11:1, or from 8:1 to 9:1; and

(105) the BOPE multilayer film has one, some, or all of the following properties: (i) the skin layer with a matte surface has a gloss from 0% to less than 50%, or from 1% to 30%, or from 1% to 20%, or from 4% to 19%; and/or (ii) the skin layer with a matte surface has a haze from greater than 50% to 100%, or from 51% to 100%, or from 51% to 90%; and/or (iii) the skin layer with a matte surface has a thickness from 1 μm to 1500 μm, or from 1 μm to 100 μm, or from 1 μm to 50 μm, or from 1 μm to 20 μm, or from 5 μm to 10 μm; and/or (v) the BOPE multilayer film has a thickness from 10 μm to 3000 μm, or from 10 μm to 100 μm, or from 10 μm to 1000 μm, or from 500 μm to 1500 μm; and/or (vi) the skin layer with a matte surface is from 1% to 50%, or from 2% to 50%, or from 5% to 40%, or from 5% to 30%, or from 5% to 20%, or from 5% to 10%, or from 10% to 30%, of the total thickness of the BOPE multilayer film; and/or (vii) the BOPE multilayer film has an overall draw ratio (draw ratio in machine direction times the draw ratio in cross direction) from 8 to 66, or from 8 to 54, or from 10 to 50, or from 20 to 40, or from 32 to 36; and/or (viii) the ratio of the draw ratio in the machine direction to the draw ratio in the cross direction is from 1.0:1.0 to 1.0:5.5, or from 1.0:1.0 to 1.0:2.5, or from 1.0:1.5 to 1.0:2.0; and/or (ix) the core directly contacts the skin layer with a matte surface.

(106) The BOPE multilayer film may comprise two or more embodiments disclosed herein.

(107) Applications

(108) The present BOPE multilayer films are well suited for use in packaging of liquids, powders, frozen foods, meat, and the like. Typical package structures in which these films can used include, but are not limited to, standup pouch, pillow pouch, 3-side seal pouch, sachets, and the like.

(109) Byway of example, and not limitation, some embodiments of the present disclosure will now be described in detail in the following Examples.

EXAMPLES

(110) The materials used in the inventive and comparative examples are reported in Table 2.

(111) TABLE-US-00002 TABLE 2 Materials Used in the Inventive and Comparative Examples Storage Storage Modulus Modulus Melt PE at 110° C. at 120° C. Density Index Component (MPa) (MPa) (g/cc) (g/10 min) PE1 <0.1 <0.1 0.910 15 PE2 22.4 7.6 0.926 1.7 Storage Storage Modulus Modulus Melt PP at 110° C. at 120° C. Density Flow Rate Component (MPa) (MPa) (g/cc) (g/10 min) PP1 124.0 77.8 0.900 0.25 PP2 49.1 19.0 0.910 7.0 PP3 54.2 24.9 0.900-0.910 8.0

(112) PE1 is ELITE™ 5815, an enhanced polyethylene (ethylene/octene copolymer), available from The Dow Chemical Company.

(113) PE2 is a linear low density polyethylene (ethylene/octene copolymer). PE2 can generally be prepared as described in the Examples of WO2018/048580 for the polyethylene identified as “2.sup.nd PE Comp,” the contents of which are herein incorporated by reference.

(114) PP1 is TOPILENE™ PPR R200P, a propylene random copolymer, available from Hyosung Corporation.

(115) PP2 is TF451, a propylene-ethylene-butene terpolymer, available from Hanwha Total.

(116) PP3 is Borealis PP RD208CF, a propylene random copolymer, and available from Borealis AG.

(117) Procedure

(118) Cast samples with 1000 micron (μm) thickness are made on a Dr. Collin cast film line with four extruders (named A, B, C and D). The length/diameter ratio of the extruder screw is 25/1. The screw diameter for A, B and D is 25 millimeters (mm) and for C it is 30 mm. These four extruders make a five layer (A/B/C/B/D) structure. Layers A, B and C use the same materials. The PE Component and the PP Component are blended and extruded by extruder D to provide the skin layer. Layer D is ˜10% of the total thickness of the film. In other words, Layer D has a thickness of 100 μm.

(119) The biaxial stretching on cast samples is conducted by an ACCUPULL™ biaxial stretcher. 4× stretching and 8× stretching are applied in the machine direction and cross direction of cast samples, respectively. In other words, each multilayer film is oriented in the machine direction at a draw ratio of 4:1, and in the cross direction at a draw ratio of 8:1. The stretching temperature is from 110° C. to 120° C.

(120) Results

(121) As reported in Table 3, only PE2 is used in skin layer A and core layers B and C of all the samples, both inventive and comparative. Only the formulation of skin layer D is different in the samples. The composition of skin layer A and the core layers B and C is not changed in order to evaluate the surface properties provided by the different skin layer D formulations. It will be appreciated that a variety of resins can be used in skin layer A and the core layers in other embodiments of the present BOPE multilayer film.

(122) By blending the PE Component (selected from different PE grades in Table 2) with the PP Component (selected from the different propylene-based polymers listed in Table 2), the sample films of Examples 1-3 (Ex. 1-3) have a matte surface with a gloss of less than 20% and a haze greater than 50%. In Examples 1-3, the storage modulus of the PP Component is larger than the storage modulus of the PE Component by more than 40 MPa at 110° C., and by more than 18 MPa at 120° C. In contrast, the films of Comparative Samples 1 and 2 have a gloss of greater than 50% and a haze less than 10%. In those comparative samples, the difference in the storage modulus of the PE Component and the PE Component is less than 40 MPa at 110° C., and less than 18 MPA at 120° C.

(123) In Table 3, “CS” refers to a comparative sample.

(124) TABLE-US-00003 TABLE 3 Sample Multilayer Film (A/B/C/B/D) Formulations and Properties Difference in storage modulus between PE Component and Skin Skin Gloss Haze PP Component (MPa) Sample Layer A.sup.1 Core.sup.2 Layer D.sup.3 (%) (%) 110° C. 120° C. Ex. 1 PE2 PE2 50% PE1 + 50% PP1 4.8 86.5 124.0 77.8 Ex. 2 PE2 PE2 60% PE2 + 40% PP1 9.8 76.8 101.6 70.2 Ex. 3 PE2 PE2 60% PE1 + 40% PP2 17.0 51.9 49.1 19.0 CS 1 PE2 PE2 50% PE2 + 50% PP2 58.1 4.2 26.7 11.4 CS 2 PE2 PE2 50% PE2 + 50% PP3 65.8 9.2 31.8 17.3 .sup.1Each sample Skin Layer A contains 100 wt % PE2, based on the total weight of the Skin Layer A. .sup.2Each sample Core contains three core layers (core layers B, C, and B), and each core layer contains 100 wt % PE2, based on the total weight of the respective core layer. Each sample Core contains 100 wt % PE2, based on the total weight of all of the core layers. .sup.3Weight percent of Skin Layer D is based on the total weight of the respective Skin Layer D. For example, Ex. 1 contains 50 wt % PE1 and 50 wt % PP1, based on the total weight of Ex. 1's Skin Layer D.

(125) It is specifically intended that the present disclosure not be limited to the embodiments and illustrations contained herein, but include modified forms of those embodiments including portions of the embodiments and combinations of elements of different embodiments as come within the scope of the following claims.