Patent ID: 6780471
Filing Date: 2004-08-24
Classification: C07F,C08G,C08K,C08L,C09D

Abstract:
A curable silicone resin composition comprising (A) an uncured silicone resin having units of the formula (R*)a(R)bSiO(4âˆ’aâˆ’b)/2, where each R* is a functional group capable of reacting with Siâ€”OH and/or Si-alkoxy groups and each R is a nonfunctional monovalent hydrocarbon group, a+b is from 1.0 to 3.0 and each molecule of uncured silicone resin contains an average of at least two groups R*, and (B) a silanol or hydrolysable compound of the formula where each Râ€² represents a hydroxyl group or a hydrolysable group; each Râ€³ represents hydrogen, a monovalent hydrocarbon which optionally is substituted, or a group within the above definition of Râ€²; and Ar is a substantially nonflexible linkage including at least one para-arylene moiety, so that the groups (Râ€²)hRâ€³Siâ€” are spatially separatedwherein (A) and (B) are present in amounts to have a weight ratio of (A) to (B) of 5:1 to 20:1.