Patent ID: 6743868
Filing Date: 2004-06-01
Classification: C08G,C08J,C08L,Y10S

Abstract:
A method for preparing a thermoplastic elastomer comprising:(I) first mixing; (A) a polyamide resin having a melting point or glass transition temperature of 25Â° C. to 275Â° C., wherein the polyamide is nylon 11, (B) a silicone base comprising, (Bâ€²) 100 parts by weight of a diorganopolysiloxane gum having a plasticity of at least 30 and having an average of at least 2 alkenyl radicals in its molecule and, optionally, (Bâ€³) 5 to 200 parts by weight of a reinforcing filler, the weight ratio of the silicone base to the polyamide resin is from 35:65 to 85:15, (C) 0.1 to 5 parts by weight of a stabilizer for each 100 parts by weight of the polyamide and the silicone base, and optionally, (D) 0.1 to 10 parts of a compatibilizer for each 100 parts by weight of the polyamide resin, then; (II) adding (E) a hydrosilation catalyst, and subsequently, (F) an organohydrido silicon compound which contains an average of at least 2 silicon-bonded hydrogen groups in its molecule and components (E) and (F) being present in an amount sufficient to cure the diorganopolysiloxane (Bâ€²); and (III) dynamically curing the diorganopolysiloxane (Bâ€²), wherein 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 simple blend wherein the diorganopolysiloxane is not cured.