| 主权项 |
1. A silicone composition X capable of curing by means of a polyaddition reaction, the composition comprising:
(1) at least one organopolysiloxane A comprising, per molecule, at least two alkenyl radicals bonded to silicon atoms, (2) at least one organohydropolysiloxane B comprising, per molecule, at least two hydrogen atoms bonded to silicon atoms, (3) at least one catalyst C which is a platinum compound and even more preferentially a Karstedt platinum, in which the amount by weight of platinum of the catalyst C relative to the total weight of the silicone composition X is less than 50 ppm, (4) at least one inhibitor D which is capable of being obtained by mixing, optionally in situ:
at least one inhibitor D1 which is an acetylenic alcohol, andat least one acid D2 which has, in aqueous solution and at 25° C., at least a pKa<−0.9, said constituents D1 and D2 being initially present in said silicone composition X in amounts sufficient to:
maintain the inhibition of the catalyst C so as to prevent the formation of a gel or of an elastomer when said silicone composition X is stored at ambient temperature, andallow the partial or complete degradation of said acetylenic alcohol D1 by chemical reaction between the inhibitor D1 and the acid D2 when the silicone composition X is cured by heating at a temperature between 70° C. and 200° C. |
