Compatibilized polypropylene heterophasic copolymer and polylactic acid blends for injection molding applications

Patent metadata

Field	Value
Publication number	US-9416264-B2
Application number	US-201514686930-A
Country	US
Kind code	B2
Filing date	Apr 15, 2015
Priority date	Jun 30, 2008
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A method of forming a compatibilized polymeric blend may include providing a polyolefin that includes a propylene heterophasic copolymer. The polyolefin may have an ethylene content of at least 10 weight percent based on a total weight of the polyolefin. The method may include melt blending the polyolefin with a polylactic acid and a reactive modifier to form the compatiblized polymeric blend. The reactive modifier may be a glycidyl methacrylate grafted polypropylene (PP-g-GMA). The reactive modified may be produced by contacting a polypropylene, a glycidyl methacrylate, a multifunctional acrylate comonomer, and an initiator under conditions suitable for the formation of PP-g-GMA having a grafting yield in a range from 1 wt. % to 15 wt. %.

First claim

What is claimed is:

1. A method comprising:
providing a polyolefin comprising one or more propylene heterophasic copolymers, the polyolefin having an ethylene content of at least 10 wt. % based on the total weight of the polyolefin; and
melt blending the polyolefin with a polylactic acid and a reactive modifier to form a compatiblized polymeric blend, wherein the reactive modifier comprises a glycidyl methacrylate grafted polypropylene (PP-g-GMA) that is produced by contacting a polypropylene, a glycidyl methacrylate, a multifunctional acrylate comonomer, and an initiator to form the PP-g-GMA having a grafting yield in a range from 1 wt. % to 15 wt. %.

2. The method according to claim 1 , wherein the one or more propylene heterophasic copolymers has an average ethylene content in a range from 11.5 wt. % to 18 wt. % based on the total weight of the copolymers.

3. The method according to claim 1 , wherein the polyolefin further comprises an elastomer comprising ethylene.

4. The method according to claim 1 , wherein the polyolefin further comprises polyethylene.

5. The method according to claim 1 , wherein the grafting yield of glycidyl methacrylate (GMA) from 1.5 wt. % to 15 wt. %.

6. The method according to claim 1 , wherein the grafting yield of glycidyl methacrylate (GMA) is in a range from about 2 wt. % to about 15 wt. %.

7. The method according to claim 1 , wherein the grafting yield of glycidyl methacrylate (GMA) is from 1.5 wt. % to 10 wt. %.

8. The method according to claim 1 , wherein the multifunctional acrylate comonomer is selected from polyethylene glycol diacrylate, alkoxylated hexanediol diacrylate, trimethylolpropane triacrylate, propoxylated neopentyl glycol diacrylate, ethoxylated trimethylolpropane triacrylate, diethylene glycol diacrylate, tris(2-hydroxyethyl)isocyanurate triacrylate, and combinations thereof.

9. The method according to claim 1 , wherein the PP-g-GMA is produced by contacting from 80 wt. % to 99.5 wt. % of the polypropylene, from 0.5 wt. % to 20 wt. % of the glycidyl methacrylate, from 0.5 wt. % to 15 wt. % of the multifunctional acrylate comonomer, and from 0.05 wt. % to 1.5 wt. % of the initiator under conditions suitable for the formation of the PP-g-GMA.

10. The method according to claim 1 , wherein the melt blending step includes melt blending the polyolefin with the polylactic acid, an inorganic filler, and the reactive modifier to form the compatiblized polymeric blend.

11. A method comprising:
contacting a polypropylene, a glycidyl methacrylate, a multifunctional acrylate comonomer, and an initiator to form glycidyl methacrylate grafted polypropylene (PP-g-GMA) having a grafting yield in a range from 1 wt. % to 15 wt. %;
providing a polyolefin comprising one or more propylene heterophasic copolymers, the polyolefin having an ethylene content of at least 10 wt. % based on the total weight of the polyolefin; and
melt blending the polyolefin with a polylactic acid and the PP-g-GMA to form a compatiblized polymeric blend.

12. The method of claim 11 , wherein the multifunctional acrylate comonomer comprises polyethylene glycol diacrylate, alkoxylated hexanediol diacrylate, or combinations thereof.

13. The method of claim 11 , wherein the multifunctional acrylate comonomer comprises propoxylated neopentyl glycol diacrylate, diethylene glycol diacrylate, or tris(2-hydroxyethyl)isocyanurate triacrylate.

14. The method of claim 11 , wherein from 80 wt. % to 99.5 wt. % of the polypropylene, from 0.5 wt. % to 20 wt. % of the glycidyl methacrylate, from 0.5 wt. % to 15 wt. % of the multifunctional acrylate comonomer, and from 0.05 wt. % to 1.5 wt. % of the initiator are contacted to form the PP-g-GMA.

15. The method of claim 11 , wherein the propylene heterophasic copolymer is a propylene based polymer comprising at least about 50 weight percent polypropylene based on a total weight of the propylene heterophasic copolymer.

16. The method of claim 11 , wherein the compatiblized polymeric blend has a melt flow rate of from 0.5 to 100 dg/min.

17. A melt blended compatiblized polymeric blend comprising:
a polyolefin, wherein the polyolefin comprises one or more propylene heterophasic copolymers, the polyolefin having an ethylene content of at least 10 wt. % based on the total weight of the polyolefin;
a polylactic acid; and
a reactive modifier, wherein the reactive modifier comprises a glycidyl methacrylate grafted polypropylene (PP-g-GMA) that is produced by contacting a polypropylene, a glycidyl methacrylate, a multifunctional acrylate comonomer, and an initiator to form the PP-g-GMA having a grafting yield in a range from 1 wt. % to 15 wt. %.

Assignees

• Fina Technology

Inventors

• Li Fengkui
• Ashbaugh John
• Desille Gabriel
• Schils Caroline

Classifications

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L23/142 Primary

  at least partially crystalline copolymers of propene with other olefins · CPC title

• C08L67/04

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

• C08L2201/06

  Biodegradable · CPC title

• C08L2205/08

  containing additives to improve the compatibility between two polymers · CPC title