Compatibilized polymeric compositions comprising polyolefin-polylactic acid copolymers and methods of making the same

Patent metadata

Field	Value
Publication number	US-9327476-B2
Application number	US-201314037876-A
Country	US
Kind code	B2
Filing date	Sep 26, 2013
Priority date	Feb 15, 2011
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

Polymeric compositions and processes of forming the same are described herein. The processes generally include contacting a polyolefin with a polylactic acid in the presence of at least 800 ppm of a radical initiator under extrusion conditions to produce a polyolefin-polylactic acid copolymer.

First claim

What is claimed is:

1. A multilayer film comprising a polyolefin layer, a polyester layer and a tie layer disposed between the polyolefin layer and the polyester layer, wherein the tie layer comprises a polyolefin-polylactic acid copolymer, a second polyolefin, and a polyester, wherein the polyolefin-polylactic acid copolymer is formed by contacting a polyolefin with a polylactic acid in the presence of at least 800 ppm of a radical initiator.

2. The multilayer film of claim 1 , wherein the polyolefin of the polyolefin-polylactic acid copolymer is selected from polypropylene, polyethylene, copolymers thereof and combinations thereof.

3. The multilayer film of claim 1 , wherein the polyolefin of the polyolefin-polylactic acid copolymer is selected from polypropylene homopolymer, polypropylene-based random copolymer, and polypropylene heterophasic copolymer, and combinations thereof.

4. The multilayer film of claim 1 , wherein the polyolefin-polylactic acid copolymer comprises from about 30 wt. % to about 70 wt. % polyolefin.

5. The multilayer film of claim 1 , wherein the polylactic acid is selected from poly(D-lactide), poly(L-lactide), and combinations thereof.

6. The multilayer film of claim 1 , wherein the polyolefin-polylactic acid copolymer comprises from about 30 wt. % to about 70 wt. % polylactic acid.

7. The multilayer film of claim 1 , wherein the polyolefin-polylactic acid copolymer comprises a multifunctional monomer.

8. A process comprising:
forming a multilayer film comprising a polyolefin layer, a polyester layer and a tie layer disposed between the polyolefin layer and the polyester layer, wherein the tie layer comprises a polyolefin-polylactic acid copolymer, a second polyolefin, and a polyester, and wherein the polyolefin-polylactic acid copolymer is formed by contacting a polyolefin and a polylactic acid in the presence of at least 800 ppm of a radical initiator.

9. The process of claim 8 , wherein the polyolefin of the polyolefin-polylactic acid copolymer is selected from polypropylene, polyethylene, copolymers thereof and combinations thereof.

10. The process of claim 8 , wherein the polyolefin of the polyolefin-polylactic acid copolymer is selected from polypropylene homopolymer, polypropylene-based random copolymer, and polypropylene heterophasic copolymer, and combinations thereof.

11. The process of claim 8 , wherein the polyolefin-polylactic acid copolymer comprises from about 30 wt. % to about 70 wt. % polyolefin.

12. The process of claim 8 , wherein the polylactic acid is selected from poly(D-lactide), poly(L-lactide), and combinations thereof.

13. The process of claim 8 , wherein the polyolefin-polylactic acid copolymer comprises from about 30 wt. % to about 70 wt. % polylactic acid.

14. The process of claim 8 , wherein the polyolefin-polylactic acid copolymer comprises a multifunctional monomer.

15. The process of claim 8 , wherein, after contacting the polyolefin and the polylactic acid in the presence of at least 800 ppm of the radical initiator, the polyolefin-polylactic acid copolymer is combined with the second polyolefin and the polyester.

16. The process of claim 8 , wherein contacting the polyolefin and the polylactic acid in the presence of at least 800 ppm of the radical initiator to form the polyolefin-polylactic acid copolymer comprises:
melt blending the polyolefin and the polylactic acid in the presence of at least 800 ppm of the radical initiator to form the polyolefin-polylactic acid copolymer;
melt compounding the polyolefin and the polylactic acid in the presence of at least 800 ppm of the radical initiator to form the polyolefin-polylactic acid copolymer; or
combinations thereof.

Assignees

• Fina Technology

Inventors

• Li Fengkui
• Ashbaugh John
• Rauscher David
• Dotter Robert

Classifications

• B32B2323/04

  Polyethylene · CPC title

• C09J123/14

  Copolymers of propene (C09J123/16 takes precedence) · CPC title

• B29C47/36

  Operations & Transport · mapped topic

• C08L67/04

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title

• C09J167/04

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C09J167/06 takes precedence) · CPC title