| 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): (CH2=CR<1>COO(CH2)n)a(Ph)bR<2>c(R<3>O)dSiO(4-a-b-c-d)/2 (1) wherein R<1 >is hydrogen or methyl, R<2 >is an C1-C8 alkyl or C2-C8 alkenyl group, Ph is phenyl, R<3 >is hydrogen or an unsubstituted or alkoxy-substituted C1-C4 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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