Inventors:
Igor Chorvath - Midland MI
Frances Marie Fournier - Flint MI
Michael Kang-Jen Lee - Midland MI
Dawei Li - Midland MI
Robert Leo Oldinski - Bay City MI
Richard Leroy Rabe - Midland MI
Jeffrey Paul Sage - Midland MI
Dean Curtis Gray - Midland MI
Yongjun Lee - Kanagawa, JP
Koji Nakanishi - Chiba, JP
Assignee:
Dow Corning Corporation - Midland MI
International Classification:
C08K 513
US Classification:
525431, 525903, 524741, 524740, 524736, 524721, 524714, 524862
Abstract:
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 25Â C. to 275Â C. , (B) a silicone base comprising (Bâ) 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 (Bâ) 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; 2,2â-(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 (Bâ); and (II) dynamically curing said diorganopolysiloxane (Bâ), 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%.