Patent ID: 6875881
Filing Date: 2005-04-05
Classification: C07F

Abstract:
1. A method for preparing a branched tetrasiloxane, comprising the steps of: preforming a liquid mixture of a disiloxane compound having the general formula (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): 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): wherein R 1 and R 2 are as defined above.