Dow Corning France, S.a.

Bernard F Grisoni

David Pocknell

Non-friable siloxane gels which can be used for gel dressings and in medical prostheses are made from compositions comprising (A) alkenyl-containing polydiorganosiloxanes; (B) hydrosilicon compounds having at least 3 Si-H groups; (C) SiH end-blocked polydiorganosiloxanes and (D) a catalyst. These compositions cure rapidly at room temperature having a ratio (RHAlk) of SiH:Si-Alkenyl of from 3:1 to 20:1, the percentage of silicon-bonded H atoms provided by (C) not being less than 81.36-(3.6.times.RHAlk) and having a value of from 10% to 90%.

Organosiloxane gel-forming compositions and use thereof

The invention relates to silicone foams. It concerns a silicone foam composition consisting of two or more components, the said composition being capable of rapid cure at 20.degree. C. on mixing its components, to give a foamed mass having a density of less than 200 kg/m.sup.3, characterised in that it comprises (A) one or more polysiloxanes having at least three alkylhydrogensiloxane units per molecule, (B) one or more polydiorganosiloxanes having at least two siloxane units of the formula ##EQU1## in which R represents a monovalent hydrocarbon group containing from 1 to 20 carbon atoms, Q represents a hydroxylated alkylene or alkoxylene chain, a has a value of 0, 1 or 2 and the value of b is 1 or 2 and c is a platinum catalyst for promoting the reaction between the components. Useful for the production of medical dressings.

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El Toro, CA, United States of America

Bernard F Grisoni