| 摘要 |
An optical waveguide comprising a substrate, a lower clad layer on the substrate, a core layer and an upper clad layer, at least one of the lower clad layer, the core layer and the upper clad layer is formed of a cured product of a photo-curable organopolysiloxane composition comprising (A) a (meth)acryloyloxy group-containing organopolysiloxane of the following average compositional formula (1): <?in-line-formulae description="In-line Formulae" end="lead"?>(CH<SUB>2</SUB>-CR<SUP>1</SUP>COO(CH<SUB>2</SUB>)<SUB>n</SUB>)<SUB>a</SUB>(Ph)<SUB>b</SUB>R<SUP>2</SUP><SUB>c</SUB>(R<SUP>3</SUP>O)<SUB>d</SUB>SiO<SUB>(4-a-b-c-d)/2</SUB> (1)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein R<SUP>1 </SUP>is hydrogen or methyl, R<SUP>2 </SUP>is an C<SUB>1</SUB>-C<SUB>8 </SUB>alkyl or C<SUB>2</SUB>-C<SUB>8 </SUB>alkenyl group, Ph is phenyl, R<SUP>3 </SUP>is hydrogen or an unsubstituted or alkoxy-substituted C<SUB>1</SUB>-C<SUB>4 </SUB>alkyl group, subscripts a, b, c and d are numbers satisfying: 0.05<=a<=0.9, 0.1<=b<=0.9, 0<=c<=0.2, 0<d<=0.5, and 0.8<=a+b+c+d<=1.5, and n is an integer of 2 to 5, and having a weight average molecular weight of 1,000 to 100,000 as measured by GPC using a polystyrene standard, and (B) a photosensitizer.
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