Patent ID: 6465552
Filing Date: 2002-10-15
Classification: C08G,C08L

Abstract:
A method for preparing a thermoplastic elastomer, said method comprising:(I) mixing (A) a thermoplastic resin selected from (Aâ€²) a thermoplastic resin comprising more than 50 percent by volume of a polyamide resin or (Aâ€³) a thermoplastic resin comprising more than 50 percent by volume of a polyester resin, (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 groups per molecule and (Bâ€³) 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) for each 100 parts by weight of said thermoplastic resin, a compatibilizer selected from (Câ€²) 0.1 to 10 parts by weight of a coupling agent having at least two groups independently selected from epoxy, anhydride, silanol, carboxy, alkoxy, organohydrido or oxazoline per molecule, (Câ€³) 0.1 to 10 parts by weight of a functional diorganopolysiloxane having at least two groups selected from epoxy, anhydride, silanol, silicon hydride, carboxyl, alkoxy having 1 to 20 carbon atoms or oxazoline per molecule, or (Câ€²â€³) 0.5 to 20 parts by weight of a copolymer selected from (i) a copolymer comprising at least one diorganopolysiloxane block and at least one block selected from polyamide, polyether, polyurethane, polyurea, polycarbonate or polyacrylate when said resin is said polyamide, or (ii) a copolymer comprising at least one diorganopolysiloxane block and at least one block selected from polyester or polycarbonate when said resin is said polyester, (D) a radical initiator, present in an amount sufficient to cure said diorganopolysiloxane gum; and (II) dynamically vulcanizing said diorganopolysiloxanes gum, wherein said thermoplastic elastomers have an elongation of at least 25% and at least one property of said thermoplastic elastomers selected from tensile strength or elongation is at least 25% greater than the respective property for a corresponding simple blend wherein said diorganopolysiloxanes gum is not cured.