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AssigneeThe Regents of the University of California
InventorsCraig J. Hawker, Rosette G. Guino, Keiichi Seki, Kenichi Takizawa, Yutaka Moti
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A process is provided for producing curable polyorganosiloxanes where noble metal oxides are used as hydrosilylation catalysts. The noble metals can be used in solid granular form or as part of a fixed bed, and do not form part of the final curable composition or cured product. The cured polyorganosiloxanes have increased stability and can be used as encapsulation resins at a temperature far lower than 300° C., have excellent light transmission properties (colorless transparency) in a wavelength region of from ultraviolet light to visible light, light resistance, heat resistance, resistance to moist heat and UV resistance, and do not generate cracks and peeling even in use over a long period of time.
A method for producing a curable polyorganosiloxane in which a silane compound contains at least one vinyl group or hydrosilyl group, and one condensable group, is reacted with a siloxane backbone in the presence of a hydrosilylation catalyst to produce said curable polyorganosiloxane, wherein the catalyst is removed from the curable polyorganosiloxane prior to curing.
Dependencies are inferred from the claim text.