Thermoplastic silicone elastomers formed from nylon resins

US6713569B2 · kind B2 · utility

Assignee

• Dow Corning Corporation · US

Inventors

• Igor Chorvath · Midland, US
• Frances Fournier · Marietta, US
• Michael Kang-Jen Lee · Midland, US
• Dawei Li · Midland, US
• Robert Leo Oldinski · Bay City, US
• Richard Rabe · Midland, US
• Jeffrey Paul Sage · Midland, US
• Dean Curtis Gray · Midland, US
• Yongjun Lee · Yongin-si, KR
• Koji Nakanishi · Konan, JP

Key dates

• Filing date: Oct 26, 2001
• Grant date: Mar 30, 2004
• Expiry date: Nov 7, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/903
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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 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 radicals 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) 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; 2,2′-(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 (B′); and(II) dynamically curing said diorganopolysiloxa…