C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5323
C08L 43/00 (2006.01) C08G 77/50 (2006.01) C08J 3/24 (2006.01) C08L 43/04 (2006.01) C08L 83/14 (2006.01)
Patent
CA 2005495
METHOD FOR THE PREPARATION OF POLYORGANOSILOXANE AND RADIATION-CURABLE COMPOSITION ABSTRACT Polyorganosiloxane having the substructure Image where R8 is a divalent group generated by an addition reaction between SiH and acryloxy, methacryloxy, or alkenyl group ant R9 is acryloxy, methacryloxy, or alkenyl, is prepared by an addition method in which an organopolysiloxane having two kinds of unsaturated groups selected from acryloxy, methacryloxy, and alkenyl and organohydrogenpolysiloxane are reacted in the presence of a platinum-type catalyst. These organopolysiloxanes are prepared without gelation and the method is highly efficient. Radiation-curable compositions based on the polyorganosiloxane are characterized by a rapid cure upon exposure to radiation, while resisting curing inhibition even in the presence of oxygen, to give a cured material whose cured surface is slightly subject to time-dependent changes, and in particular whose peeling or release force undergoes little variation with the passage of time.
Masaoka Hiroshi
Sasaki Shosaku
Dow Corning Toray Silicone Company Limited
Gowling Lafleur Henderson Llp
Masaoka Hiroshi
Sasaki Shosaku
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