Polyolefin compositions with improved impact strength

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

C - Chemistry, Metallurgy

08

L

400/3029

C08L 51/00 (2006.01) C08L 23/02 (2006.01) C08L 51/06 (2006.01) C08L 57/00 (2006.01)

Patent

CA 2025403

RHCP-010 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 polyolefins. 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 CH2=C(CH3)COOR, where R may be alkyl, aryl, or aralkyl, substituted or unsubstituted, and less than 20%, based on a total monomer weight, of 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 average 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.

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