Patent ID: 6709753
Filing Date: 2004-03-23
Classification: C08G,C08L,H01L,Y10T

Abstract:
A resin composition comprising a silicone-modified phenolic resin obtained by reacting a phenolic resin having in a molecule at least two structural units of the following formula (1): wherein R3 is hydrogen and R4 is hydrogen or a monovalent hydrocarbon group having 1 to 6 carbon atoms, with an organopolysiloxane having the following average compositional formula (2):(R1)a(R2)bSiO(4âˆ’aâˆ’b)/2â€ƒâ€ƒ(2) wherein R1 is selected from the class consisting of a hydrogen atom, a hydroxyl group, an alkoxy group, an alkenyloxy group, and a monovalent organic group containing an amino, epoxy, hydroxyl or carboxyl group, R2 is a substituted or unsubstituted monovalent hydrocarbon group, letters a and b are positive numbers satisfying 0.001&lE;a&lE;1, 1&lE;b&lE;2.5 and 1&lE;a+b&lE;3, the number of silicon atoms in a molecule is an integer of 2 to 1,000, and the number of functional groups R1 directly attached to silicon atoms in a molecule is an integer of at least 1,said modified phenolic resin being such that after said modified phenolic resin is cured alone to form a cured product or after said modified phenolic resin is added to another phenolic resin and cured together to form a cured product, the organopolysiloxane component does not form a phase separation structure in the cured product.