Patent ID: 9346945
Filing Date: 2016-05-24
CPC Classification: C08G,C08K,C08L,C09D,C09J

Claim Text:
1. A filled silicone composition comprising a mixture of: (A) an in situ-prepared treated silica; (B) an in situ-prepared (siloxane-alkylene)-endblocked polydiorganosiloxane (“SAE Polymer”); (C) a catalytically effective amount of a cure catalyst; and (D) a crosslinking effective amount of a crosslinker; wherein the composition is prepared by: treating an untreated silica with a treating effective amount of a treating agent in presence of an alkenyl-endblocked polydiorganosiloxane (“AE Polymer”) so as to produce a liquid silicone rubber master batch (“LSR MB”) comprising a mixture of the treated silica and the AE Polymer; converting the AE Polymer in the LSR MB with a converting effective amount of a SiH containing siloxane and a catalytically effective amount of a hydrosilation catalyst so as to produce a SiH converted polymer master batch (“SCP MB”) comprising a mixture of the treated silica and the SAE Polymer; and mixing the SCP MB with sufficient amounts of the cure catalyst and the crosslinker so as to produce the composition, and wherein the AE Polymer is an alkenyl-endcapped polydimethylsiloxane of formula (VE1): wherein n is an average number of from 100 to 1000, and a dynamic viscosity of from 100 to 100,000 milliPascal-seconds (mPa·s) when tested as described in ASTM D1084; the untreated silica has a surface area of from 200 to 400 square meters per gram (m wherein each R