Patent ID: 6242525
Filing Date: 2001-06-05
Classification: C08L,Y10T

Abstract:
Thermoplastic elastomers of high strength, high elasticity and good dyeability, comprising propylene polymers and incorporated elastomeric particles of elastomeric C.sub.2 to C.sub.8 olefin copolymers with an average diameter ranging from 0.05 to 5 .mu.m wherein the thermoplastic elastomers are prepared by a process from a mixture comprising(a) 40 to 60 percent by weight relative to total polymer, of a propylene polymer selected from the group consisting of propylene homopolymers, propylene copolymers and combinations thereof,(b) 60 to 40 percent by weight relative to total polymer, of an elastomeric polymer of C.sub.2 to C.sub.8 olefins selected from the group consisting of olefin copolymers, terpolymers and combinations thereof,(c) 0.2 to 1.5 percent by weight, relative to total polymer, of readily volatile C.sub.4 to C.sub.7 dienes,(d) 0.2 to 1.5 percent by weight, relative to total polymer, of thermally decomposing free radical-forming agents, selected from the group consisting of acyl peroxides, alkyl peroxides, hydroperoxides, peroxycarbonates, peresters, ketone peroxides, peroxyketals and azo compounds, and(e) 0.01 to 40 percent by weight, relative to total polymer, of auxiliary materialsby melting, reacting and removing the unreacted readily volatile C.sub.4 to C.sub.7 dienes from the produced thermoplastic elastomers.