Crosslinking of (meth)acryloxyalkenylene functional siloxane...

Details Crosslinking of (meth)acryloxyalkenylene functional siloxane... Crosslinking of (meth)acryloxyalkenylene functional siloxane...

C - Chemistry, Metallurgy

08

G

402/25, 400/5323

C08G 77/20 (2006.01) C08L 83/06 (2006.01) C08L 83/07 (2006.01)

Patent

CA 2014064

A composition cureable to a solid crosslinked polyorganosiloxane comprises: (a) an acrylic functional silicon prepolymer having a plurality of acrylic groups of the formula: (see above formula) bound to silicon atoms thereof, where R is H or methyl, and R1 is a divalent olefinically unsaturated hydrocarbon group, (b) a silicone prepolymer having a plurality of organothiol groups thereon, and (c) an effective amount of a thiolene cure catalyst. Particularly preferred formulations are photoinitiated formulations employing alkylthiol functional silicones in which the total number of thiol groups is between 0.5 and 1.5 times the total number of ~ene groups counting both the acrylic and the linking group R1 as ~ene groups.

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