Thermoplastic silicone elastomers formed from nylon resins

The present invention relates to a thermoplastic elastomer composition wherein a silicone base and a stabilizer are blended with a polyamide resin and a silicone gum contained in the base is dynamically vulcanized in the mixture. A method for preparing a thermoplastic elastomer is disclosed, said method comprising (I) mixing(A) a rheologically stable polyamide resin having a melting point or glass transition temperature of 25° C. to 275° C.,(B) a silicone base comprising(B′) 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(B″) 5 to 200 parts by weight of a reinforcing filler,the weight ratio of said silicone base to said polyamide resin is from 35:65 to 85:15,(C) 0.01 to 5 parts by weight of a stabilizer per 100 parts by weight of said polyamide resin plus said silicone base, said stabilizer being selected from hindered phenols; thioesters; hindered amines; 2,2′-(1,4-phenylene)bis(4H-3,1-benzoxazin-4-one); and 3,5-di-tert-butyl-4-hydroxybenzoic acid, hexadecyl ester,(D) an organohydrido silicon compound which contains an average of at least 2 silicon-bonded hydrogen groups in its molecule and(E) a hydrosilation catalyst,components (D) and (E) being present in an amount sufficient to cure said diorganopolysiloxane (B′); and(II) dynamically curing said diorganopolysiloxane (B′),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 said diorganopolysiloxane is not cured and said thermoplastic elastomer has an elongation of at least 25%.