Patent ID: 6153691
Filing Date: 2000-11-28
Classification: C08G,C08L

Abstract:
A method for preparing a thermoplastic elastomer, said method comprising:(I) first mixing(A) a thermoplastic resin selected from polyolefins, polyamides, thermoplastic polyurethanes or styrenic block copolymers,(B) at least one silanol-terminated diorganopolysiloxane having a viscosity of at least 10 Pa-s at 25.degree. C.,(C) optionally, up to 300 parts by weight of a filler for each 100 parts by weight of said diorganopolysiloxane, said filler being selected from the group consisting of(i) a reinforcing filler for said diorganopolysiloxane and(ii) a silicone resin,(D) an organohydrido silicon compound which contains an average of at least 2 silicon-bonded hydrogen groups in its molecule and(E) a platinum-free condensation catalyst, components (D) and (E) being present in an amount sufficient to cure said diorganopolysiloxane; and(II) dynamically curing said diorganopolysiloxane (B), wherein the amount of said diorganopolysiloxane (B) used is such that at least one property of the thermoplastic elastomer selected from tensile strength or elongation is at least 25% greater than the respective property for a corresponding blend wherein said diorganopolysiloxane is not cured and said thermoplastic elastomer has an elongation of at least 25%.