Patent ID: 8129452
Filing Date: 2012-03-06
Classification: C08G,C08K,C08L

Abstract:
1. A composition comprising a stabilizing additive for improving resistance to decomposition of silicone elastomers, the additive comprising: a) at least one platinum complex selected from the products of formula (I): in which: L in which: L b) a combination of a) with at least one other platinum complex selected from the complexes: platinum in the zero oxidation state, platinum in the +2 oxidation state or platinum in the +4 oxidation state, and further comprising a curable polyorganosiloxane composition C, catalyst and optionally one or more compound(s) of reinforcing or semireinforcing or bulking fillers or fillers used to adjust rheology of the curable compositions, the composition comprising (a″) 100 parts by weight of at least one polydiorganosiloxane gum which is a linear homopolymer or copolymer exhibiting, per molecule, at least 2 vinyl groups bonded to different silicon atoms situated in a chain and/or at chain ends, other organic radicals of which bonded to silicon atoms are selected from the group consisting of methyl, ethyl and phenyl radicals, at least 60 mol % of these other radicals being methyl radicals, and said gum exhibiting a viscosity of at least 300 000 mPa·s at 25° C.; (b″) 0.1 to 7 parts by weight of an organic peroxide; and (c″) 0.5 to 120 parts by weight of siliceous filler(s) per 100 parts by weight of gum (a″).