Transparent storage-stable polysiloxanes which crosslink...

Details Transparent storage-stable polysiloxanes which crosslink... Transparent storage-stable polysiloxanes which crosslink...

C - Chemistry, Metallurgy

08

L

400/5311

C08L 83/06 (2006.01) C08L 83/04 (2006.01) C08L 83/10 (2006.01)

Patent

CA 1037186

Abstract A polysiloxane composition which can be cross- linked under atmospheric condition and which consists essentially of: a) 100 parts by weight of an .alpha.,.omega.-dihydroxymethyl- phenylpolysiloxane with about 7-15 mole % of diphenylsiloxy units or about 14-28 mole % of ethylphenylsiloxy units, and having a viscosity of between about 1.000 and 500,000 cSt (at 20°C), b) about 1 to 40 parts by weight of an uncoated reinforcing filler consisting essentially of SiO2 having a specific surface area of about 40 to 500 m2/g by the BET method, and c) about 1 to 10 parts by weight of a cross- linking agent of the formula Image wherein R is an alkyl, halogenoalkyl, aryl or arylalkyl radical, and X is an alkoxy, acyloxy, oximato or alkylamino radical. A curing catalyst nay also be present. The composition is clear as are the silicone rubbers produced upon curing. - 1 -

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