Articles including a compatibilized polypropylene and polylactic acid blend

Patent metadata

Field	Value
Publication number	US-9290647-B2
Application number	US-201414253535-A
Country	US
Kind code	B2
Filing date	Apr 15, 2014
Priority date	Jun 30, 2008
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A composition comprising a blend of a polyolefin, polylactic acid, and a reactive modifier. A method of producing an oriented film comprising reactive extrusion compounding a mixture comprising polypropylene, polylactic acid, a reactive modifier to form a compatibilized polymeric blend, casting the compatibilized polymeric blend into a film, and orienting the film. A method of preparing a reactive modifier comprising contacting a polyolefin, a multifunctional acrylate comonomer, and an initiator under conditions suitable for the formation of an epoxy-functionalized polyolefin wherein the epoxy-functionalized polyolefin has a grafting yield of from 0.2 wt. % to 15 wt. %.

First claim

What is claimed is:

1. An article comprising:
a blend of polypropylene, polylactic acid, and glycidyl methacrylate grafted polypropylene;
wherein the glycidyl methacrylate grafted polypropylene is prepared by grafting glycidyl methacrylate onto polypropylene in the presence of an initiator and a multi-functional acrylate comonomer, and wherein the multi-functional acrylate comonomer comprises polyethylene glycol diacrylate or alkoxylated hexanediol diacrylate.

2. The article of claim 1 , wherein the article is a blowmolded article, an extrusion article, injection blowmolded article, an injection stretch blowmolded article, or a thermoformed article.

3. The article of claim 1 , wherein the article is a fiber.

4. The article of claim 1 , wherein the article is an injection molded article.

5. The article of claim 4 , wherein the article exhibits a tensile modulus of from 200 kpsi to 350 kpsi as determined in accordance with ASTM D638.

6. The article of claim 4 , wherein the article exhibits a tensile strength at yield of from 4,000 psi to 6,000 psi as determined in accordance with ASTM D882.

7. The article of claim 4 , wherein the article exhibits a flexural modulus of from 170 kpsi to 300 kpsi as determined in accordance with ASTM D790.

8. The article of claim 4 , wherein the article exhibits a notched Izod impact strength of from 0.2 ft lb/in to 2.0 ft lb/in.

9. The article of claim 1 , wherein the article is an oriented film.

10. The article of claim 9 , wherein the oriented film is oriented in the machine direction, the transverse direction, or both.

11. The article of claim 9 , wherein the oriented film exhibits a secant modulus of from 200 kpsi to 400 kpsi.

12. The article of claim 9 , wherein the oriented film exhibits a tensile elongation at break of from 50% to 150%.

13. The article of claim 9 , wherein the oriented film exhibits a tensile strength at break of from 20 kpsi to 40 kpsi.

14. The article of claim 1 , wherein the glycidyl methacrylate grafted polypropylene has a grafting yield of from 0.2 wt. % to 15 wt. %.

15. The article of claim 14 , wherein the polypropylene is present in an amount of from 51 wt. % to 99 wt. % based on a total weight of the blend, the polylactic acid is present in an amount of from 1 wt. % to 40 wt % based on the total weight of the blend, and the glycidyl methacrylate grafted polypropylene is present in an amount of from 0.5 wt. % to 15 wt. % based on the total weight of the blend.

16. The article of claim 1 , wherein the multi-functional acrylate comonomer has a flash point of from 50° C. to 120° C.

17. The article of claim 1 , wherein a ratio of GMA to multifunctional acrylate comonomer in the PP-g-GMA is from 1:5 to 10:1.

Assignees

• Fina Technology

Inventors

• Li Fengkui
• Coffy Tim J
• Daumerie Michel

Classifications

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L23/10 Primary

  Homopolymers or copolymers of propene · CPC title

• C08L23/12 Primary

  Polypropene · CPC title

• B29C48/022

  characterised by the choice of material · CPC title

• C08L23/00 Primary

  Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers · CPC title