Patent ID: 6288196
Filing Date: 2001-09-11
Classification: C08G

Abstract:
A process for continuously preparing an organopolysiloxane gum, comprising the steps of:(I) mixing (A) at least one cyclopolysiloxane of the following general formula (1): ##STR6##wherein R.sup.1 and R.sup.2 are independently substituted or unsubstituted monovalent hydrocarbon groups, and n is an integer of at least 3, with (B) an end capping agent,(II) feeding the mixture of components (A) and (B) of step (I) to a self-cleaning continuous polymerization reactor, continuously feeding and mixing (C) an alkaline polymerization catalyst with the mixture, and effecting polymerization at a temperature of 100 to 250.degree. C. and under subatmospheric pressure, and(III) continuously adding a neutralizing agent to the reaction mixture of step (II) in a sufficient amount to neutralize the catalyst, thereby terminating the polymerization reaction.