Thermoplastic silicone elastomers from compatibilized polyester resins

A method for preparing a thermoplastic elastomer comprising:

• (I) mixing
• (A) a thermoplastic resin comprising more than 50 percent by volume of a polyester resin said thermoplastic resin having a softening point of 23° C. to 300° C.,
• (B) a silicone elastomer 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 in its molecule and, optionally,
• (B″) up to 200 parts by weight of a reinforcing filler, the weight ratio of said silicone elastomer to said thermoplastic resin is from 35:65 to 85:15,
• (C) a glycidyl ester compatibilizer,
• (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 vulcanizing 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 30%.