Patent ID: 6290892
Filing Date: 2001-09-18
Classification: B29C,B29K,B32B,C08G,C08J

Abstract:
A process for preparing a laminated composite of an addition type silicone rubber and a polyurethane comprising the following the steps:(a) mixing a modifier, a silicone gel of addition type and a curing agent for said silicone gel to form a mixture, said modifier having the following formula (I): ##STR7##wherein m=25.about.50; R.sub.1 m R.sub.2, R.sub.3, and R.sub.4, independently are --CH.sub.3 or --CH.sub.2 CH.sub.3 ; R' is R or OR, wherein R is a polymer backbone having a molecular weight of 1000.about.20000;(b) introducing said mixture from step (a) into a cavity of a mold, in which a surface of the cavity is formed by a material having a critical surface tension greater than that of a polymer having a repeating unit of said R;(c) curing said mixture in said cavity to form a shaped article;(d) removing said shaped article from said mold;(e) placing a polyurethane precursor on a surface of said shaped article which contacts said surface of said cavity; and(f) curing said polyurethane precursor to form an cured polyurethane bonding to said surface of said shaped article, so that a laminated composite is formed.