Patent ID: 6403749
Filing Date: 2002-06-11
Classification: C08G

Abstract:
A method for preparing an organoxy-terminated organopolysiloxane, comprising the steps of:reacting (1) an organopolysiloxane of the following general formula (I): wherein R is a monovalent hydrocarbon group and n is such an integer that the organopolysiloxane has a viscosity of 10 to 100,000 centistokes at 25Â° C., with (2) an organopolysiloxane of the following general formula (II): wherein â€œaâ€  is an integer of 0, 1 or 2, R1 is a substituted or unsubstituted monovalent hydrocarbon group of 1 to 18 carbon atoms, and R2 is an organic group of 1 to 18 carbon atoms, or a partial hydrolyzate thereof, to form an organoxy-terminated organopolysiloxane of the general formula (A): wherein R, R1, R2, â€œaâ€  and n are as defined above,the reaction of components (1) and (2) being effected in the presence of (3) a tetraalkoxytitanium of the following general formula (III): Ti(OR3)4â€ƒâ€ƒ(III) â€ƒwherein R3 is an alkyl group, and adding methanol during or at the end of the reaction.