POLYOLEFIN MASTERBATCH FOR PREPARING IMPACT-RESISTANT POLYOLEFIN ARTICLES

摘要

A masterbatch composition comprising 1 10-50 wt% of a crystalline propylene homopolymer and 2 50-90 wt% of a blend consisting of a a copolymer of ethylene and one or more C4-CIO a-olefins, containing 10-40 of C4-CIO a-olefins, and b an amorphous copolymer of propylene and ethylene. Copolymer b has an ethylene content from 20-70 wt%, and an intrinsic viscosity value of the xylene-soluble moiety of from 2.2 to 3.5 dL/g, this value being equal to 0.8 to 1.2 times the intrinsic viscosity value of the xylene-soluble moiety of copolymer a. The weight ratio of copolymers a/b is from 3/1 to 1/3. Polyolefin compositions comprising the said masterbatch composition are suitable for the manufacture of automotive parts.