Unsaturated polysiloxanes, polymerizable compositions and...

Details Unsaturated polysiloxanes, polymerizable compositions and... Unsaturated polysiloxanes, polymerizable compositions and...

C - Chemistry, Metallurgy

08

G

88/40, 400/5346,

C08G 77/20 (2006.01) C08F 290/14 (2006.01) C08F 299/08 (2006.01) C08G 18/61 (2006.01) C08G 18/81 (2006.01) C08G 77/26 (2006.01) C08G 77/388 (2006.01) C08G 77/54 (2006.01) C08L 83/07 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1238135

Unsaturated polysiloxanes, polymerizable compositions and contact lenses thereof Abstract of the Disclosure Polysiloxanes of uniform molecular weight (MW) distribution with 400-10,000 MW segments of polysiloxane and containing at least one vinyl group connected to said polysiloxane segments through intervening alkylene-urea or -urethane linkages are prepared from polysiloxane-polyols, -polyamines or -polythiols by reaction with an unsaturated compound containing an isocyanato moiety, for example 2-isocyanatoethyl methacrylate. The polysiloxanes containing the vinyl groups are useful as radiation- or thermally curable coatings for glass, textiles, plastics, wood, ceramics, metals, as films or bandages for medicinal purposes, or molded shapes, in form of contact lenses, catheters or implants, either by themselves or in combination with other vinyl monomers; and are particularly useful in preparing hard or soft contact lenses, including hydrogel contact lenses.

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