Patent ID: 7456231
Filing Date: 2008-11-25
Classification: C08L,Y10S

Abstract:
1. A radiation-crosslinked, thermoset article comprised of a polymer composition, the polymer composition comprising: (a) at least 60 percent by weight of a polyethylene homopolymer or copolymer selected from the group consisting of high density polyethylene (HDPE), medium density polyethylene (MDPE), linear medium density polyethylene (LMDPE), and a copolymer of ethylene with 1-butene, 1-hexene or 1-octene; (b) from about 5 percent by weight to less than 50 percent by weight of a polypropylene selected from the group consisting of polypropylene homopolymer and polypropylene copolymers; and (c) from 0 to 20 percent by weight of an ethylene-propylene elastomer; wherein the article is crosslinked by exposure to radiation and possesses a sufficient degree of crosslinking such that when the article is heated to a temperature above the crystalline melting point of the polypropylene, it is softened but does not become liquid.