Patent ID: 6214962
Filing Date: 2001-04-10
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) a polymerization catalyst of thermal decomposition type with the mixture, and effecting polymerization at a temperature of 80 to 130.degree. C., and(III) heating the reaction mixture of step (II) at a temperature of 130 to 200.degree. C. under subatmospheric pressure for deactivating the catalyst, thereby terminating the polymerization reaction.