METHOD FOR PRODUCING LIQUID SILICONE RUBBER BASE AND METHOD FOR PRODUCING ADDITION CURING TYPE LIQUID SILICONE RUBBER COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a liquid silicone rubber base giving an addition curing type liquid silicone rubber composition greatly suppressing increase in viscosity in storage over the time period and containing a silica filler losing no fluidity even by addition of a tackifier.;SOLUTION: The method for producing a liquid silicone rubber base includes: a first process for kneading (C) a silica surface treatment agent and (D) water or (E) an ammonium solution in compounding (A) an alkenyl group-containing organopolysiloxane and (B) silica fine powder with a specific surface of 50 m²/g or more; a second process for performing heat treatment on a mixture obtained in the first process; a third process for kneading (C) the surface treatment agent with a mixture obtained in the second process; and a fourth process for performing heat treatment on a mixture obtained in the third process.;COPYRIGHT: (C)2009,JPO&INPIT