Blowing agent compositions and compositions curable to give...

C - Chemistry – Metallurgy – 08 – L

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C08L 83/04 (2006.01) C08J 9/04 (2006.01) C08J 9/12 (2006.01) C08K 3/36 (2006.01)

Patent

CA 2094206

Blowing agent compositions (a) comprising aqueous emulsions containing organopolysiloxanes (1), emulsifiers (2), water (3) and thickeners (4) which may be used in the preparation of elastomeric silicone foams. The blowing agent compositions are used in curable compositions to form elastomeric silicone foams which comprise the blowing agent compositions (a), diorganopolysiloxanes (b), crosslinking agents (c) and, if appropriate, crosslinking catalysts (d) and optionally fillers (e). Elastomeric silicone foams are prepared by mixing the blowing agent compositions (a), with curable organopolysiloxane compositions containing diorganopolysiloxanes (b), crosslinking agents (c) and, if appropriate, crosslinking catalysts (d) and optionally fillers (e) and also optionally additional substances and then the resultant mixture is cured at temperatures in the range of from 100 to 250°C with simultaneous foaming to form the elastomeric silicone foams.

Divulgation de compositions d'agents d'expansion (a) comprenant des émulsions aqueuses contenant des organopolysiloxanes (1), des émulsifiants (2), de l'eau (3) et des épaississants (4), pouvant être utiles pour préparer des mousses silicone élastomères. Les compositions d'agents d'expansion sont utilisées dans des compositions polymérisables pour former des mousses silicone élastomères comprenant les compositions d'agents d'expansion (a), des diorganopolysiloxanes (b), des agents de réticulation (c) et, si cela est pertinent, des catalyseurs de réticulation (d) et, facultativement, des matières de charge (e). Les mousses silicone élastomères sont préparées en mélangeant les compositions d'agents d'expansion (a) avec des compositions d'organopolysiloxanes polymérisables contenant des diorganopolysiloxanes (b), des agents de réticulation (c) et, si cela est pertinent, des catalyseurs de réticulation (d) et, facultativement, des matières de charge, et de manière facultative également des substances additionnelles, et le mélange ainsi obtenu est polymérisé à des températures se situant dans la gamme allant de 100 à 250 degrés C, avec un moussage simultané de manière à former les mousses silicone élastomères.

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