Thermoplastic silicone elastomers employing radical cure

Thermoplastic elastomers are disclosed which are prepared by;(I) mixing,(A) a thermoplastic resin comprising more than 50 percent by volume of a polyamide or a polyester resin,(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 groups per molecule and(B'') 5 to 200 parts by weight of a reinforcing filler,wherein the weight ratio of said silicone base to said polyamide or polyester resin is from 35:65 to 85:15,(C) a compatibilizer,(D) a radical initiator, present in an amount sufficient to cure said diorganopolysiloxane gum, and optionally(E) a stabilizer,(II) dynamically vulcanizing said diorganopolysiloxanes gum,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%.