Patent ID: 6441075
Filing Date: 2002-08-27
Classification: C08L

Abstract:
A polyolefin-based resin composition that is in an amount of 100 wt % in total, said composition consisting essentially:(a) 60-66 wt % of a crystalline propylene-ethylene block copolymer, said block copolymer comprising a first segment of a homopolymer of propylene and a second segment of a copolymer of propylene and ethylene, said block copolymer having an isotactic pentad tacticity of at least 0.96, a ratio of a weight average molecular weight of said block copolymer to a number average molecular weight of said block copolymer being not greater than 6; (b) 12-20 wt % of an ethylene-propylene copolymer rubber containing therein 50-60 wt % of ethylene, said rubber having a Mooney viscosity of from 45 to 55 at 125Â° C.; (c) 18-25 wt % of an inorganic filler that is one selected from the group consisting of a talc, a first combination of said talc and a glass fiber, and a second combination of said talc and a whisker, said talc having an average particle diameter of not greater than 2 &mgr;m, said glass fiber having an average fiber length of from 5 to 10 mm and an average diameter of from 15 to 20 &mgr;m, and said whisker having an average fiber length of from 15 to 25 &mgr;m and an average diameter of from 0.5 to 1 &mgr;m.