POLYOLEFIN COMPOSITION WITH IMPROVED IMPACT PROPERTIES

摘要

The present invention includes a composition comprising a coupled impact propylene copolymer. Preferably, the coupled impact propylene copolymer has an elastomeric phase that is present in an amount of at least 9 weight percent of the coupled propylene copolymer. Articles formed from the coupled propylene copolymer exhibit improved directionally balanced impact properties as compared with articles formed form comparable noncoupled impac t propylene copolymers and also exhibit improved ducfile-to-brittle transition temperatures compared with comparable noncoupl ed impact propylene copolymers. The invention also includes methods for making the coupled impact propylene copolymers using coupling agents, preferably, poly(sulfonyl azides). The invention further includes articles of manufacture that are made from th e coupled impact propylene copolymer of the invention.