Polyolefin compositions with improved impact strength

Details Polyolefin compositions with improved impact strength Polyolefin compositions with improved impact strength

1989-09-28

1991-03-05

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 80, 525301, C08L 5100

Patent

active

049978845

ABSTRACT:
The addition of a polyolefin-acrylic graft copolymer to blends of polyolefin and core-shell polymers improves compatibility and allows core-shell polymers to be used as processing and performance modifiers pololefins. Generally the compatibilizing additive is a graft copolymer of a polyolefin and a methacrylate. More specifically, the graft copolymer is derived from at least about 80% of a monomer of a methacrylic ester of the formula CH.sub.2 .dbd.C(CH.sub.3)COOR, where R may be alkyl, aryl, or aralkyl, substituted or unsubstituted, and less than 20%, based on a total monomer weight, off an acrylic or styrenic monomer copolymerizable with the methacrylic ester grafted on to a non-polar polyolefin trunk, so that at least one chain is a polymer with a weight averge molecular weight greater than about 20,000 and is present in a weight ratio with the polyolefin trunk of from about 1:9 to about 4:1.
A typical composition may contain about 20% core-shell modifier, about 10% compatibilizer, the balance being polyolefin.

REFERENCES:
patent: 3886227 (1975-05-01), VanBrederode et al.
patent: 4555546 (1985-11-01), Patel
patent: 4595726 (1986-06-01), Klosiewicz
patent: 4831079 (1989-05-01), Ting
patent: 4842947 (1989-06-01), Jachec et al.

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