Thermoplastic silicone elastomers from compatibilized polyamide resins

A method for preparing a thermoplastic elastomer, 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 groups 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) for each 100 parts by weight of said polyamide resin, a compatibilizer selected from
• (i) from 0.1 to 5 parts by weight of a coupling agent having a molecular weight of less than 800 which contains at least two groups independently selected from ethylenically unsaturated group, epoxy, anhydride, silanol, carboxyl, hydroxyl, alkoxy, having 1 to 20 carbon atoms or oxazoline in its molecule,
• (ii) from 0.1 to 10 parts by weight of a functional diorganopolysiloxane having at least one group selected from epoxy, anhydride, silanol, carboxyl, amine, alkoxy having 1 to 20 carbon atoms or oxazoline in its molecule, or
• (iii) from 0.1 to 10 parts by weight of a copolymer comprising at least one diorganopolysiloxane block and at least one block selected from polyamide, polyether, polyurethane, polyurea, polycarbonate or polyacrylate,
• (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′),
• (F) a stabilizer 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;
• and
• (II) dynamically curing said diorganopolysiloxane (B′).