Patent ID: 6875881

Claim:
A method for preparing a branched tetrasiloxane, comprising the steps of: preforming a liquid mixture of a disiloxane compound having the general formula (1): R 1 3 SiOSiR 1 3 (1) wherein R 1 is hydrogen or a substituted or unsubstituted monovalent hydrocarbon group of 1 to 20 carbon atoms, an alcohol and an acid catalyst, adding a trialkoxysilane compound having the general formula (2): R 2 Si(OR 3 ) 3 (2) wherein R 2 and R 3 each are a substituted or unsubstituted monovalent hydrocarbon group of 1 to 20 carbon atoms to the mixture and effecting reaction, and adding water to the reaction mixture to effect co-hydrolysis, thereby forming a branched tetrasiloxane having the general formula (3): R 2 Si(OSiR 1 3 ) 3 (3) wherein R 1 and R 2 are as defined above.