Olympus Optical Company, Ltd.

Toshiba Silicone Co., Ltd.

Kohei Hamanishi

Hitoshi Watanabe

Atsushi Kurita

Toshiyuki Kanno

Shigeki Matsushita

Nobuyuki Nishiwaki

Disclosed is a curable silicone composition comprising: (A) an organopolysiloxane having a silicon-bonded unsaturated aliphatic radical; (B) an organopolysiloxane having a silicon-bonded mercaptoalkyl radical; and (C) a photoreaction-initiating amount of photoreaction initiator. The photoreaction initiator includes arylcarbonyl phosphine oxide compounds, having a radical selected from the group consisting of substituted and unsubstituted aryl radicals, and another two radicals selected from the group consisting of substituted and unsubstituted monovalent hydrocarbon radicals. The above silicone, composition is efficiently cured by visible light radiation and usable for photo-curable adhesives.

Photo-curable silicone compositions and adhesive silicone compositions

An optical information recording medium includes an optical information recording layer supported on a substrate. The recording layer contains an organic dye represented by general formula: ##STR1## where R is 1,2-naphthylene group, 2,3-naphthylene group, 3,4-naphthylene group, or ##STR2##

Optical information recording medium

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Tokyo, Japan

Kohei Hamanishi