Patent ID: 6403716
Filing Date: 2002-06-11
Classification: C08L

Abstract:
A thermoplastic rubber composition which comprises(A) 1-99 parts by weight of a crosslinkable rubbery polymer having a glass transition temperature not higher than âˆ’30Â° C. and comprising at least one selected from the group consisting of a diene type rubber, a hydrogenated rubber obtained by hydrogenating not less than 50% of total double bonds of said diene type rubber, an ethylene/&agr;-olefin copolymer rubber, an ehthylene-propylene-diene terpolymer rubber, an isoprene rubber, a chloroprene rubber, an acrylic rubber, and a thermoplastic elastomer comprising a rubber component described above and (B) 1-99 parts by weight of a polypropylene resin (B) containing propylene units of not less than 50% by weight and units of ethylene or an &agr;-olefin with 4-20 carbon atoms as a comonomer copolymerizable with propylene (total amount of (A) and (B) being 100 parts by weights), said thermoplastic rubber composition being crosslinked, wherein said (B) comprises a polypropylene resin (B-1) which generates a torque higher than Mo after melting, and a polypropylene resin (B-2) which generates a torque not higher than Mo after melting, in a melting test of said (B) in the presence of an organic peroxide (temperature condition being at 200Â° C.), and Mo being a torque right after complete melting.