A method for the preparation of linear siloxanes having terminal hydroxyl groups

摘要

A process is disclosed for preparing linear hydroxy end-terminated linear siloxanes comprising the steps of; a) mixing chlorosiloxanes having the formula ClR2SiO(R1 2SiO)xSiR2Cl where x is an integer having a value from 1 - 10, each R and R1 is an independently selected monovalent hydrocarbon group, with volatile methyl siloxanes to form a solution of chlorosiloxanes in volatile methyl siloxanes; b) hydrolyzing the solution of chlorosiloxanes in volatile methyl siloxanes to form a hydrolysis mixture of reaction products; c) separating the hydrolysis mixture of reaction products into an aqueous phase and a siloxane phase comprising hydroxy end-terminated linear siloxanes and volatile methyl siloxanes; and d) recovering the hydroxy end-terminated linear siloxanes from the siloxane phase.