Organosilicon compositions

Details Organosilicon compositions Organosilicon compositions

C - Chemistry, Metallurgy

08

G

402/27, 400/7223

C08G 77/20 (2006.01) C07F 7/08 (2006.01) C07F 7/21 (2006.01) C08G 77/50 (2006.01) C08K 5/5419 (2006.01) C08L 83/14 (2006.01)

Patent

CA 2008028

0897p PATENT Leibfried Case 5-6-8 ORGANOSILICON COMPOSITIONS Abstract of the Disclosure A process for making organosilicon prepolymer compositions by reacting, in the presence of a hydrosilation catalyst, (a) a cyclic polysiloxane or tetrahedral siloxysilane containing at least two ?SiH groups and (b) a polycyclic polyene having at least two non-aromatic, non-conjugated carbon-carbon double bonds in its rings, one of the compounds (a) and (b) having more than two reactive sites, in which the ratio of the carbon-carbon double bonds to the ?SiH groups is at least 1.8:1, and the use of the organosilicon prepolymer compositions made by the said process to make thermoset organosilicon polymers by curing them, including blending the organosilicon prepolymer compositions before curing with an additional cyclic polysiloxane or tetrahedral siloxysilane or a linear, short chain ?SiH - terminated polysiloxane.

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