| 主权项 |
1. An organopolysiloxane composition X which is a precursor of a silicone foam, comprising:
at least one polyorganosiloxane A having a viscosity of from 10 to 300 000 mPa.s and exhibiting, per molecule, at least two C2-C6 alkenyl groups bonded to the silicon, at least one polyorganosiloxane B having a viscosity of from 1 to 5000 mPa.s and exhibiting, per molecule, at least two ≡SiH units, a catalytically effective amount of at least one catalyst C which is a compound derived from at least one metal belonging to the platinum group, at least one porogenic agent D, optionally at least one diorganopolysiloxane oil E blocked at each end of a diorganopolysiloxane chain thereof, by a triorganosiloxy unit, the organic radicals of which bonded to the silicon atoms are selected from alkyl radicals having from 1 to 8 carbon atoms inclusive, cycloalkyl groups, and aryl groups, at least one inorganic filler F which is a fumed silica, with a specific surface area S of less than 65 m2/g, optionally at least one additive G, and optionally at least one polyorganosiloxane resin H, with the additional condition that the choice, the nature and the amount of the constituents are determined such that the viscosity of said organopolysiloxane composition X is less than 55 000 mPa.s and said viscosities are dynamic viscosities measured at 25° C. using a Brookfield viscometer according to the instructions of the AFNOR NFT 76-102 standard, wherein the amount of the inorganic filler F is from 0.1 to 20 parts by weight per 100 parts by weight of the organopolysiloxane composition X. |
