Pe-pla compositions for caps and closures

Patent metadata

Field	Value
Publication number	US-2016208083-A1
Application number	US-201414898218-A
Country	US
Kind code	A1
Filing date	Jul 2, 2014
Priority date	Jul 2, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A cap or closure may be made of a high density polyethylene and polylactic acid composition. The cap or closure may be made by injection moulding or compression moulding. The cap or closure may be a screw-on cap for carbonated or still drinks.

First claim

1 . A cap or closure made from a resin composition consisting of at least 50 wt % of a polyethylene based on a total weight of the resin composition having a density of at least 0.940 g/cm 3 and of at most 0.970 g/cm 3 when measured following the ASTM D-1505 method at 23° C. and 2 to 50 wt % of polylactic acid based on the total weight of the resin composition.

2 . The cap or closure according to claim 1 , wherein the polyethylene has a melt index MI 2 of from 1 g/10 min to 10 g/10 min when measured following the ASTM D-1238 method at 190° C. under a load of 2.16 kg.

3 . The cap or closure according to claim 1 , wherein the polyethylene has a density of at least 0.945 g/cm 3 and of at most 0.965 g/cm 3 .

4 . The cap or closure according to claim 3 , wherein the polyethylene has a density of at least 0.950 g/cm 3 and of at most 0.960 g/cm 3 .

5 . The cap or closure according to claim 1 , wherein the resin composition comprises consists of at least 5 wt % and at most 30 wt % of polylactic acid, based on the total weight of said resin composition.

6 . The cap or closure according to claim 5 wherein the resin composition consists of at least 10 wt % and at most 20 wt % of polylactic acid, based on the total weight of said resin composition.

7 . The cap or closure according to claim 1 , wherein the cap or closure is a screw cap.

8 . A process for the production of a cap or closure, said process consisting of:
(a) blending at least 50 wt % of a polyethylene, based on a total weight of the blend, having a density of at least 0.940 g/cm 3 and of at most 0.970 g/cm 3 and 2 to 50 wt % of polylactic acid based on the total weight of the blend, (b) extruding the blend, (c) injection moulding or compression moulding the extruded blend into the cap or closure.

9 . A process comprising using the cap or closure of claim 1 , in the food or drink industry.

10 . The process according to claim 9 , wherein the cap or closure is used for carbonated and still drinks.

11 . A process comprising using a resin composition for the manufacture of a cap or closure by injection moulding or compression moulding, wherein the resin composition consists of at least 50 wt % of a polyethylene based on a total weight of the resin composition having a density of at least 0.940 g/cm 3 and of at most 0.970 g/cm 3 when measured following the ASTM D-1505 method at 23° C. and 2 to 50 wt % of polylactic acid based on the total weight of the resin composition.

12 . A cap or closure made from a resin composition comprising at least 50 wt % of a polyethylene based on a total weight of the resin composition having a density of at least 0.940 g/cm 3 and of at most 0.970 g/cm 3 when measured following the ASTM D-1505 method at 23° C. and 2 to 50 wt % of polylactic acid based on the total weight of the resin composition.

Assignees

• Total Res & Technology Feluy

Inventors

• Standaert Alain
• Luijkx Romain
• Ribour David
• Pereira Antonio

Classifications

• C08L2207/06

  Properties of polyethylene · CPC title

• C08L23/06

  Polyethylene · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• B65D41/04

  Threaded or like caps or cap-like covers secured by rotation · CPC title

• C08J2467/04

  Polyesters derived from hydroxy carboxylic acids, e.g. lactones (C08J2467/06 takes precedence) · CPC title