Method of preparing crosslinked polydiorganosiloxane using...

Details Method of preparing crosslinked polydiorganosiloxane using... Method of preparing crosslinked polydiorganosiloxane using...

C - Chemistry, Metallurgy

09

K

402/15, 403/24

C09K 3/10 (2006.01) C08G 18/61 (2006.01) C08J 9/06 (2006.01) C08K 5/29 (2006.01)

Patent

CA 1129582

Abstract of the Disclosure A crosslinked polydiorganosiloxane is prepared by mixing a mercapto-functional polydiorganosiloxane endblocked with organosiloxy units of formulae Image , Image Image , Image , and an organic diisocyanate, a catalyst, such as a tertiary organic amine and water. The resulting product is a sponge if the water is added in the liquid state or a non-porous elastomer if the water in the gas state is allowed to penetrate a blend of the polydiorsanosiloxane, organic diisocyanate and tertiary organic amine. Density of sponge prepared by this method can range from about 35 kilograms per cubic meter to about 750 kilograms per cubic meter. A blend of the mercapto-functional polydiogranosiloxane, organic diisocyanate and tertiary organic amine can be used to make sponge by adding water in the liquid state or a non-porous elastomer by exposing it to air. Sponge elastomer prepared herein is useful as thermal and sound insulation. Solid elastomer is useful as a sealant or caulk.

335558

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