Patent ID: 6407193
Filing Date: 2002-06-18
Classification: C08G

Abstract:
A process of producing a random siloxane copolymer comprising the step of reacting at least one diol, at least one dicarbonate and a silicon compound as copolymerization components in the presence of an esterification or transesterification catalyst, wherein said silicon compound is at least one selected from the group consisting of compounds represented by the general formulas (I) and (II): wherein R1, R2, R3, R4, X and Y are each independently a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, or a substituted or non-substituted organic group; a represents an integer of 0 to 5,000; and b represents an integer of 3 to 20; further comprising the step of reacting at least one diester of a dicarboxylic acid as an additional copolymerization component, wherein said diester of a dicarboxylic acid is represented by the general formula (IV): wherein R8 is a bivalent hydrocarbon group having 1 to 20 carbon atoms wherein at least some of the hydrogen atoms in the hydrocarbon group may be substituted with at least one group selected from a halogen atom, a hydrocarbon group, an alkoxy group and a phenoxy group; or â€”R10â€”Dâ€”R11â€”, and R9 is a hydrocarbon group having 1 to 20 carbon atoms, wherein R10 and R11 are each independently a bivalent aromatic hydrocarbon group having 6 to 20 carbon atoms; and D is selected from the group consisting of a single bond, â€”Oâ€”, â€”Sâ€”, â€”SOâ€”, â€”SO2â€”, â€”COâ€” and a bivalent hydrocarbon group having 1 to 20 carbon atoms.