C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5328, 400/72
C08L 83/07 (2006.01) C08L 83/04 (2006.01)
Patent
CA 1296830
SOFT SILICONE ELASTOMERS Abstract of the Disclosure A curable mixture for preparing soft silicone elastomers having low exudation properties comprises: a) 100 parts by weight of a vinyl-containing base polymer of the formula Image in which R and R' are alkyl having 1 to 8 carbon atoms, aryl having 3 to 8 carbon atoms, vinyl having 3 to 8 carbon atoms, and fluoroalkyl having 3 to 8 carbon atoms, with the proviso that said base polymer contains a statistical average of 0.5 to 1.8 vinyl groups per molecule, and x is a sufficiently large number that the viscosity of the polymer is between 0.1 and 300,000 Pascal-seconds at 20°C, b) 0.1 to 50 parts by weight of an organohydrogensiloxane of the formula Image Le A 24 634-US wherein R" is an alkyl having 1 to 8 carbon atoms, aryl having 3 to 8 carbon atoms or fluoralkyl having 3 to 8 carbon atoms, m is at least 3, and the sum of n and m is a sufficiently large number that said siloxane has a viscosity of 0.005 to 0.1 Pascal-seconds at 25°C, c) 1 to 250 ppm of a platinum catalyst, and d) 0 to 200 parts by weight of filler. Le A 24 634
542457
Fetherstonhaugh & Co.
Ge Bayer Silicones Gmbh & Co. Kg
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