Release components to increase anti-adhesion properties of thermoplastic packaging material

Abstract

The invention relates to a composition Z comprising a component A, component B and/or C, and component D, wherein the component A is a thermoplastic material selected from the group consisting of polyolefins, polyolefin copolymers and polystyrenes; the component B is an organic additive selected from the group consisting of glycerol, a polyglycerol, a glycerol ester, a polyglycerol ester and a combination thereof; the component C is an organic additive selected from the group consisting of sorbitol, a sorbitol ester, sorbitan, a sorbitan ester, and a combination thereof; the component D is an inorganic additive selected from the group of layered double hydroxides.

Claims

1. A formed plastic container having an inner surface layer comprising a composition Z; wherein composition Z includes a component A, a component D and at least one of component B or component C, or both components B and C, wherein: the component A is a thermoplastic material selected from the group consisting of a polyolefin, polyolefin copolymer and polystyrene; the component B is an organic additive selected from the group consisting of glycerol, a polyglycerol, a glycerol ester, a polyglycerol ester and a combination thereof; the component C is an organic additive selected from the group consisting of sorbitol, a sorbitol C.sub.8-C.sub.18 alkyl ester, sorbitan, a sorbitan C.sub.8-C.sub.18 alkyl ester, and a combination thereof; the component D is an inorganic additive selected from the group of layered double hydroxides in an amount from 0.1 to 15%, based on a total weight of composition Z; wherein said container is a multilayer container, provided that when component A is a polystyrene composition Z includes component A, component D and both components B and C.

2. The formed plastic container as claimed in claim 1, wherein component B is present in an amount of from 0.05 to 20%, based on a total weight of composition Z.

3. The formed plastic container as claimed in claim 1, wherein component C is present in an amount of from 0.05 to 20%, by weight, based on a total weight of composition Z.

4. The formed plastic container as claimed in claim 1, wherein component D is present in an amount of from 1 to 5%, based on a total weight of composition Z.

5. The formed plastic container as claimed in claim 1, wherein component D is a hydrotalcite.

6. The formed plastic container as claimed in claim 1, wherein composition Z further comprises one or more further additives as component E.

7. The formed plastic container as claimed in claim 6, wherein component E is a colorant.

8. The formed plastic container as claimed in claim 1, wherein the composition Z contains from 14 to 99.98% by weight of component A; from 0.01 to 70% by weight of component C; wherein component C is sorbitan, or a sorbitan ester; from 1 to 15% by weight of component D; from 0 to 80% by weight component E; with the % by weight being based in each case on a total weight of the composition Z; and with the % by weight of the components A, C, D and optionally E always adding up to 100%.

9. The formed plastic container as claimed in claim 1, wherein the container contains a food or beverage product.

10. The formed plastic container as claimed in claim 1, wherein the container contains personal care, cosmetics, pharmaceutical, household, or industrial products.

11. A method for preparing composition Z as claimed in claim 1, comprising the step of physically mixing component A, component D and at least one of component B or component C, or both components B and C.

12. A method for preparing composition Z as claimed in claim 11, comprising the step of physically mixing components A, C, and D.

13. A formed plastic container having an inner surface layer comprising a composition Z; wherein composition Z includes a component A, a component D and a component C, wherein: the component A is a thermoplastic material selected from the group consisting of a polyolefin, polyolefin copolymer and polystyrene; the component C is an organic additive selected from the group consisting of sorbitol, a sorbitol C.sub.8-C.sub.18 alkyl ester, sorbitan, a sorbitan C.sub.8-C.sub.18 alkyl ester, and a combination thereof; and the component D is an inorganic additive selected from the group of layered double hydroxides in an amount from 0.1 to 15%, based on a total weight of composition Z.

14. The formed plastic container as claimed in claim 13, wherein component C is sorbitan, or a sorbitan ester.

15. The formed plastic container as claimed in claim 13, wherein component C is present in an amount from 0.05 to 20%, by weight, based on a total weight of composition Z.

16. The formed plastic container as claimed in claim 14, wherein component C is present in an amount from 0.1 to 5%, by weight, based on a total weight of composition Z.

17. The formed plastic container as claimed in claim 13, wherein component D is a hydrotalcite.

18. The formed plastic container as claimed in claim 13, wherein component D is present in an amount from 1 to 5%, based on a total weight of composition Z.

19. The formed plastic container as claimed in claim 13, wherein the composition Z contains: from 88% to 99.98% by weight of component A; from 0.01 to 5% by weight of component C; from 0.01 to 10% by weight of component D; from 0 to 10% by weight of an optional component E; with the % by weight being based in each case on a total weight of the composition Z; and with the % by weight of the components A, C, D and optionally E always adding up to 100%.

20. The formed plastic container as claimed in claim 13, wherein said container is a multilayer container.

Description

EXAMPLES

(1) % by weight mentioned in the following examples are based on the total weight of the mixture, composition or article; parts are parts by weight;

(2) “ex” means example; “cpex” means comparative example; MB means masterbatch; CO means compound; unless indicated otherwise.

(3) Substances Used

(4) Component A1:

(5) Low Density Polyethylene (LDPE) powder: LDPE Riblene®, M.F.I. 2 g/10 min 190° C. 2.16 kg; density 0.925 g/cm.sup.3 (ASTM D3236-88)

(6) Component A2:

(7) Low Density Polyethylene (LDPE) powder: LDPE, M.F.I. 20 g/10 min 190° C. 2.16 kg (ASTM D1238); density 0,922 g/cm.sup.3 (ASTM D1505)

(8) Component A3:

(9) High Density Polyethylene (HDPE) powder: HDPE, M.F.I. 25 g/10 min 190° C. 2.16 kg (ASTM D1238); density 0,955 g/cm.sup.3 (ASTM D1505)

(10) Component A4:

(11) High Density Polyethylene (HDPE) granules: HDPE Eraclene® BC82 M.F.I. 0.25 g/10 min 190° C. 2.16 kg; density 0,953 g/cm.sup.3 (ASTM D1505)

(12) Component B1:

(13) Grindsted® PGE 308D (mixture of mono-, di-, tri-, and tetraglycerol esterified with vegetable fatty acids; total ester content >90%) commercially available from Danisco

(14) Component C1:

(15) Atmer® 100 Liquid sorbitan ester (mp 10° C.) CAS. No. 8028-02-2, available from Croda:

(16) Component D1:

(17) Additive commercially available from Clariant as Sorbacid® 911 CAS 11097-59-9

(18) Component D2:

(19) Additive commercially available from Clariant as Hycite® 713 CAS 11097-59-9

(20) Component E1:

(21) Pigment Blue 29 Ultramarine Blue CAS 101357-30-6

(22) Masterbatches MB1 to MB6

(23) The components were homogenized together on a Leistritz® ZSE18HP extruder at a temperature of 150° C. to obtain solid masterbatches MB1 to MB6; Table 1 gives the details.

(24) TABLE-US-00001 TABLE 1 Components used [parts] Masterbatches A1 A2 A3 B1 C1 D1 D2 E1 MB1 90 10 MB2 92 8 MB3 90 10 MB4 80 20 MB5 70 30 MB6 70 30
Ex1 to Ex7 and Cpex a) to Cpex7:

(25) Component A4 and the other components were mixed and homogenized in the ratios according to Table 2. The obtained Compounds CO1 to CO15 were used to manufacture 250 ml two-layer bottles via Extrusion Blow Molding process on a Magic Mp® machine. As an example of operational mode, components A4 was inserted in the main hopper applied to the main stream of a Magic Mp® machine (model ME-500/ND), the other components (MB1, MB2, MB3, MB4, MB5, MB6) are added through a secondary dosing unit, each hopper is connected to an extrusion barrel. The melt flow of the material A4 and of the other components is then pushed through a die to produce the parison. Barrel temperatures can be kept at temperatures between 180 and 190° C.; cycle time can vary between 15 and 18 seconds.

(26) The hot thermoplastic polymeric parison is received within a mould cavity whereupon pressurized gas provides the blow moulding of the container to the shape of the mould cavity.

(27) This unit, equipped e.g. with a mould for 250 ml (nominal capacity) bottle, the parison is inserted in the bottle moulds and blown by injecting dry air with a profile of pressure reaching 6 to 8 bar at its maximum, the blowing process requiring 10 to 15 seconds time. Blown bottles are then collected from the blowing unit for the necessary testing.

(28) The end-consumer product selected for the tests was the ketchup Calvé®, the residue of ketchup remaining in the bottles, prepared with compounds CO1 to CO15 as described above, was then measured by following the methods described above. Table 3 gives the details.

(29) TABLE-US-00002 TABLE 2 A + B + ex- Components used [parts] C + D cpex Compounds A4 MB1 MB2 MB3 MB4 MB5 MB6 [%] cpex a) CO1 100 — (virgin HDPE) cpex1 CO2 80 20 2 cpex2 CO3 70 30 3 cpex3 CO4 58 40 2 4 ex1 CO5 60 20 20 4 ex2 CO6 68 20 10 2 4 ex3 CO7 75.5 15 7.5 2 3 cpex4 CO8 81.3 2 16.7 5 cpex5 CO9 64.7 2 33.3 10 ex4 CO10 65.5 10 12.5 10 2 4 ex5 CO12 55 25 20 4 ex6 CO13 63 25 10 2 4 cpex7 CO14 62.5 37.5 3 ex7 CO15 71.7 18.8 7.5 2 3

(30) TABLE-US-00003 TABLE 3 Compounds Ketchup Calvè residue percentage CO1 (virgin HDPE) 5.6 CO2 (comp) 4.6 CO3 (comp) 4.8 CO4 (comp) 4.8 CO5 (inv) 3.4 CO6 (inv) 3.2 CO7 (inv) 3.5 CO8 (comp) 5.7 CO9 (comp) 5.6 CO10 (inv) 3 CO12 (inv) 2.9 CO13 (inv) 2.8 CO14 (comp) 4 CO15 (inv) 3.5