Gas barrier enhancing additives and methods

Patent metadata

Field	Value
Publication number	US-9764872-B2
Application number	US-201414776108-A
Country	US
Kind code	B2
Filing date	Mar 14, 2014
Priority date	Mar 14, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

Polyesters compositions comprising gas barrier enhancing additives and containers comprising such polyester compositions are provided herein. Also provided are methods for preparing polyester containers comprising said gas barrier enhancing additives. The polyester containers of the present invention exhibit decreased permeability to gases thereby providing improved shelf-life.

First claim

The invention claimed is:

1. A polyester container having enhanced gas barrier properties comprising a polyester composition comprising a polyester and a gas barrier enhancing additive, wherein the gas barrier enhancing additive is a purine derivative selected from the group consisting of purine dimers, purine trimers and purine tetramers.

2. The polyester container of claim 1 , wherein the polyester is selected from the group consisting of polyethylene terephthalate, polyethylene terephthalate copolymer, polyethylene naphthalate, polyethylene isophthalate, aliphatic polyesters and combinations thereof.

3. The polyester container of claim 2 , wherein the polyester is polyethylene terephthalate or a polyethylene terephthalate copolymer.

4. The polyester container of claim 1 , wherein the loading level of the gas barrier enhancing additive is in the range of about 0.1 to about 40 weight percent of the polyester composition.

5. The polyester container of claim 1 , wherein the gas barrier enhancing additive has a molecular weight greater than about 194 g/mole.

6. The polyester container of claim 1 , wherein the vapor pressure of the gas barrier enhancing additive at 260° C. is less than about 25 Pa.

7. A method for forming a hollow plastic container comprising:
(i) providing a polyester resin material;
(ii) heating the polyester resin material to provide a molten resin;
(iii) adding a gas barrier enhancing additive to the molten resin, wherein the gas barrier enhancing additive is a purine derivative selected from the group consisting of purine dimers, purine trimers and purine tetramers;
(iv) introducing the molten resin into a mold;
(v) cooling the molten resin to form a preform;
(vi) removing the perform from the mold; and
(vii) blow molding the perform to form a hollow plastic container.

8. A method for forming a hollow plastic container comprising:
(i) providing a polyester resin material comprising a polyester and a gas barrier enhancing additive, wherein the gas barrier enhancing additive is a purine derivative selected from the group consisting of purine dimers, purine trimers and purine tetramers;
(ii) heating the polyester resin material to provide a molten resin;
(iii) introducing the molten resin into a mold;
(iv) cooling the molten resin to form a preform;
(v) removing the perform from the mold; and
(vi) blow molding the perform to form a hollow plastic container.

9. The method of claim 8 , wherein the polyester is polyethylene terephthalate or a polyethylene terephthalate copolymer.

10. The method of claim 9 , wherein the container is a polyethylene terephthalate bottle.

11. The polyester container of claim 1 , wherein the polyester container comprises a plurality of layers.

12. The polyester container of claim 1 , wherein the polyester container exhibits increased shelf-life from about 1.0 times to about 2.0 times relative to a standard polyester container.

13. The polyester container of claim 1 , wherein oxygen permeation is reduced greater than about 10% relative to a standard polyester container.

14. The polyester container of claim 1 , wherein carbon dioxide permeation is reduced greater than about 10% relative to a standard polyester container.

15. The method of claim 9 , wherein the container is a polyethylene terephthalate copolymer bottle.

Assignees

• Coca Cola Co
• Cspc Innovation Pharmaceutical Co Ltd

Inventors

• Kriegel Robert
• Hui Liu

Classifications

• B29C49/071

  Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties · CPC title

• B29C2949/0715

  the preform having one end closed · CPC title

• B29B11/14 Primary

  characterised by structure or composition · CPC title

• B29B2911/1404

  Operations & Transport · mapped topic

• B29L2031/7158

  Bottles · CPC title