Oxygen scavengers, compositions comprising the scavengers, and articles made from the compositions

Patent metadata

Field	Value
Publication number	US-10040922-B2
Application number	US-201514935953-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	Nov 13, 2009
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

The present disclosure relates to oxygen scavenging molecules, compositions comprising the molecules, and articles made from the compositions.

First claim

What is claimed is:

1. A method for making an oxygen scavenging polymer composition comprising the step of combining:
a) a thermoplastic polymer;
b) a transition metal in a positive oxidation state, the metal present in the composition in an amount of from about 10 ppm to about 400 ppm; and
c) a compound having the formula:

wherein R 1 is chosen from:
i) —CH 3 ;
ii) —CHO; or
ii) a combination thereof; and
the index n is equal to 1 or 2.

2. A method of preparing an article comprising the step of providing a polymer composition, the composition comprising:
a) a thermoplastic polymer;
b) a transition metal in a positive oxidation state, the metal present in the composition in an amount of from about 10 ppm to about 400 ppm; and
c) a compound having the formula:

wherein R 1 is chosen from:
i) —CH 3 ;
ii) —CHO; or
ii) a combination thereof; and
the index n is equal to 1 or 2, and
forming an article from the composition.

3. The method of claim 2 , wherein the step of forming comprises injection moulding, stretch blow moulding, extrusion, thermoforming, or extrusion blow moulding.

4. The method of claim 2 , wherein the step of forming is sheet or film extrusion.

5. The method of claim 2 , wherein the article is a bottle or a preform.

6. The method of claim 1 , wherein the transition metal is present in the composition in an amount of from about 30 ppm to about 150 ppm.

7. The method of claim 1 , wherein the thermoplastic polymer is a polyester homopolymer or polyester copolymer.

8. The method of claim 1 , wherein the thermoplastic polymer comprises polyethylene terephthalate or a copolymer thereof.

9. The method of claim 1 , wherein the compound comprises from about 1% to about 10% by weight of the composition.

10. The method of claim 1 , wherein the compound comprises from about 1% to about 5% by weight of the composition.

11. The method of claim 1 , wherein the compound comprises from about 1% to about 3% by weight of the composition.

12. The method of claim 1 , further comprising the step of combining a colorant.

13. The method of claim 2 , wherein the transition metal is present in the composition in an amount of from about 30 ppm to about 150 ppm.

14. The method of claim 2 , wherein the thermoplastic polymer is a polyester homopolymer or polyester copolymer.

15. The method of claim 2 , wherein the thermoplastic polymer comprises polyethylene terephthalate or a copolymer thereof.

16. The method of claim 2 , wherein the compound comprises from about 1% to about 10% by weight of the composition.

17. The method of claim 2 , wherein the compound comprises from about 1% to about 5% by weight of the composition.

18. The method of claim 2 , wherein the compound comprises from about 1% to about 3% by weight of the composition.

19. The method of claim 2 , further comprising the step of combining a colorant.

20. The method of claim 2 , wherein the article is a sheet, a cup, or a jar.

Assignees

• Deshpande Girish N
• Plastipak Packaging Inc

Inventors

• Deshpande Girish N

Classifications

• C08K5/3417 Primary

  condensed with carbocyclic rings · CPC title

• C08K5/098

  Metal salts of carboxylic acids · CPC title

• B65D81/266

  for absorbing gases, e.g. oxygen absorbers or desiccants (B65D51/244, B65D51/30 take precedence) · CPC title

• C08L67/00

  Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers · CPC title

• C08K5/0083

  Nucleating agents promoting the crystallisation of the polymer matrix · CPC title