The present invention relates to a heterophasic polyolefin composition and articles produced therefrom with improved mechanical and optical properties, particularly low stress whitening. The present invention further relates to a process for the preparation of such a heterophasic polyolefin composition, articles made therefrom, particularly films, and uses of the heterophasic polyolefin composition. The heterophasic propylene copolymer composition comprises a heterophasic propylene copolymer (HECO) comprising a matrix (M) being a propylene homopolymer (H-PP) and an elastomeric propylene copolymer (EPC) dispersed in said matrix (M), wherein the heterophasic propylene copolymer (HECO) has (a) a melt flow rate MFf3/4 (2.16 kg, 230° C.) measured according to ISO 1133 in the range of 5.0 to 25.0 g/10 min, (b) a soluble fraction content (SF) determined by TREF fractionation on CRYSTEX QC, Polymer Char (Valencia, Spain) in the range of 10.0 to 25.0 wt. %, (c) an ethylene content of the soluble fraction content (SF) in the range of from 18 wt. % to less than 39 wt. %, (d) an intrinsic viscosity (IV) determined according to DIN ISO 1628/1 (in decalin at 135° C.) of the soluble fraction (SF) in the range of from 1.5 to 2.5 dl/g, (e) a crystalline fraction content (CF) determined by TREF fractionation on CRYSTEX QC, Polymer Char (Valencia, Spain) in the range of 75 to 90 wt. %, (f) an ethylene content of the crystalline fraction content (CF) of from 0.1 wt. % to 5.0 wt. %, and the heterophasic propylene copolymer composition has a total ethylene content in the range of from 7 to 30 wt. %, determined by quantitative NMR spectroscopy.

The present invention relates to a heterophasic polyolefin composition and articles produced therefrom with improved mechanical and optical properties, particularly low stress whitening. The present invention further relates to a process for the preparation of such a heterophasic polyolefin composition, articles made therefrom, particularly films, and uses of the heterophasic polyolefin composition. The heterophasic propylene copolymer composition comprises a heterophasic propylene copolymer (HECO) comprising a matrix (M) being a propylene homopolymer (H-PP) and an elastomeric propylene copolymer (EPC) dispersed in said matrix (M), wherein the heterophasic propylene copolymer (HECO) has (a) a melt flow rate MFf3/4 (2.16 kg, 230° C.) measured according to ISO 1133 in the range of 5.0 to 25.0 g/10 min, (b) a soluble fraction content (SF) determined by TREF fractionation on CRYSTEX QC, Polymer Char (Valencia, Spain) in the range of 10.0 to 25.0 wt. %, (c) an ethylene content of the soluble fraction content (SF) in the range of from 18 wt. % to less than 39 wt. %, (d) an intrinsic viscosity (IV) determined according to DIN ISO 1628/1 (in decalin at 135° C.) of the soluble fraction (SF) in the range of from 1.5 to 2.5 dl/g, (e) a crystalline fraction content (CF) determined by TREF fractionation on CRYSTEX QC, Polymer Char (Valencia, Spain) in the range of 75 to 90 wt. %, (f) an ethylene content of the crystalline fraction content (CF) of from 0.1 wt. % to 5.0 wt. %, and the heterophasic propylene copolymer composition has a total ethylene content in the range of from 7 to 30 wt. %, determined by quantitative NMR spectroscopy.

The present invention relates to a polymer comprising moieties derived from ethylene and moieties derived from 1-hexene, wherein the polymer has: (a) a density of ≥910 and ≤930 kg/m.sup.3 as determined in accordance with ASTM D1505 (2010); (b) a melt mass-flow rate of ≥0.5 and ≤5.0 g/10 min, as determined in accordance with ASTM D1238 (2013) at a temperature of 190° C. under a load of 2.16 kg; (c) a fraction that is not eluted in analytical temperature rising elution fractionation (a-TREF) at a temperature >30.0° C. of ≥8.0 wt %, with regard to the total weight of the polymer; and (d) a fraction eluted in a-TREF at a temperature >94.0° C. of ≥20.0 wt %, with regard to the total weight of the polymer. Such polymer allows for the production of bi-directionally oriented films having a particularly desirable ability to be stretched at a high stretching ratio, in both the machine direction and in the transverse direction, and particularly to be stretched to a high stretching ratio in the machine direction and the transverse direction combined. Further this polymer allows for production of bi-directionally oriented films within a particularly and desirably broad temperature range in which the stretching can be performed without imparting any deficiencies of hampering the film production processes in continuous film production.

The present invention relates to a polymer comprising moieties derived from ethylene and moieties derived from 1-hexene, wherein the polymer has: (a) a density of ≥910 and ≤930 kg/m.sup.3 as determined in accordance with ASTM D1505 (2010); (b) a melt mass-flow rate of ≥0.5 and ≤5.0 g/10 min, as determined in accordance with ASTM D1238 (2013) at a temperature of 190° C. under a load of 2.16 kg; (c) a fraction that is not eluted in analytical temperature rising elution fractionation (a-TREF) at a temperature >30.0° C. of ≥8.0 wt %, with regard to the total weight of the polymer; and (d) a fraction eluted in a-TREF at a temperature >94.0° C. of ≥20.0 wt %, with regard to the total weight of the polymer. Such polymer allows for the production of bi-directionally oriented films having a particularly desirable ability to be stretched at a high stretching ratio, in both the machine direction and in the transverse direction, and particularly to be stretched to a high stretching ratio in the machine direction and the transverse direction combined. Further this polymer allows for production of bi-directionally oriented films within a particularly and desirably broad temperature range in which the stretching can be performed without imparting any deficiencies of hampering the film production processes in continuous film production.

Provided herein are polyethylene compositions with unimodal molecular weight distribution exhibiting an excellent balance of physical properties. The polyethylene compositions may have density of 0.935 to 0.975 g/cm.sup.3 and Melt Index (I.sub.2.16) of 0.1 to 1 g/10 min. Polyethylene compositions of certain embodiments may exhibit environmental stress crack resistance (ESCR, 10% Igepal, ASTM D1693 Cond. B) within the range from 45 to 80 hours, and/or (ESCR, 100% igepal, ASTM D1693 Cond. B) within the range from 70 to 250 hours. Such ESCR outperforms other unimodal resins of similar melt index and density, approaching ESCR performance of more expensive and complex resins with bimodal molecular weight distribution. The polyethylene compositions of certain embodiments may have two distinct crystalline fractions as shown by temperature rising elution fractionation (TREF).

Provided herein are polyethylene compositions with unimodal molecular weight distribution exhibiting an excellent balance of physical properties. The polyethylene compositions may have density of 0.935 to 0.975 g/cm.sup.3 and Melt Index (I.sub.2.16) of 0.1 to 1 g/10 min. Polyethylene compositions of certain embodiments may exhibit environmental stress crack resistance (ESCR, 10% Igepal, ASTM D1693 Cond. B) within the range from 45 to 80 hours, and/or (ESCR, 100% igepal, ASTM D1693 Cond. B) within the range from 70 to 250 hours. Such ESCR outperforms other unimodal resins of similar melt index and density, approaching ESCR performance of more expensive and complex resins with bimodal molecular weight distribution. The polyethylene compositions of certain embodiments may have two distinct crystalline fractions as shown by temperature rising elution fractionation (TREF).

The present invention relates to an olefin-based polymer, which has (1) a density (d) ranging from 0.850 g/cc to 0.865 g/cc, (2) a melt index (MI, 190° C., 2.16 kg load conditions) ranging from 0.1 g/10 min to 3.0 g/10 min, (3) a melt temperature (Tm) of 10° C. to 100° C., and (4) a hardness (H, Shore A), the density (d) and the melt temperature (Tm) satisfying Equation 1, and Equation 2 or 3. The olefin-based polymer according to the present invention has low hardness and improved foaming properties, and exhibits improved impact strength at compounding.

The present invention relates to an olefin-based polymer, which has (1) a density (d) ranging from 0.850 g/cc to 0.865 g/cc, (2) a melt index (MI, 190° C., 2.16 kg load conditions) ranging from 0.1 g/10 min to 3.0 g/10 min, (3) a melt temperature (Tm) of 10° C. to 100° C., and (4) a hardness (H, Shore A), the density (d) and the melt temperature (Tm) satisfying Equation 1, and Equation 2 or 3. The olefin-based polymer according to the present invention has low hardness and improved foaming properties, and exhibits improved impact strength at compounding.

Disclosed herein are ethylene-based polymers generally characterized by a melt index of less than 15 g/10 min, a density from 0.91 to 0.945 g/cm.sup.3, a CY-a parameter at 190° C. from 0.2 to 0.6, an average number of long chain branches per 1,000,000 total carbon atoms of the polymer in a molecular weight range of 500,000 to 2,000,000 g/mol of less than 5, and a maximum ratio of η.sub.E/3η at an extensional rate of 0.03 sec.sup.−1 in a range from 3 to 15. The ethylene polymers have substantially no long chain branching in the high molecular weight fraction of the polymer, but instead have significant long chain branching in the lower molecular weight fraction, such that polymer melt strength and bubble stability are maintained for the fabrication of blown films and other articles of manufacture. These ethylene polymers can be produced using a dual catalyst system containing a single atom bridged metallocene compound with an indenyl group and a cyclopentadienyl group, and an unbridged hafnium metallocene compound with two cyclopentadienyl groups.

Disclosed herein are ethylene-based polymers generally characterized by a melt index of less than 15 g/10 min, a density from 0.91 to 0.945 g/cm.sup.3, a CY-a parameter at 190° C. from 0.2 to 0.6, an average number of long chain branches per 1,000,000 total carbon atoms of the polymer in a molecular weight range of 500,000 to 2,000,000 g/mol of less than 5, and a maximum ratio of η.sub.E/3η at an extensional rate of 0.03 sec.sup.−1 in a range from 3 to 15. The ethylene polymers have substantially no long chain branching in the high molecular weight fraction of the polymer, but instead have significant long chain branching in the lower molecular weight fraction, such that polymer melt strength and bubble stability are maintained for the fabrication of blown films and other articles of manufacture. These ethylene polymers can be produced using a dual catalyst system containing a single atom bridged metallocene compound with an indenyl group and a cyclopentadienyl group, and an unbridged hafnium metallocene compound with two cyclopentadienyl groups.