Photosensitive resin composition for optical waveguide formation, optical waveguide and method for producing optical waveguide
The present invention has an object to provide a photosensitive resin composition for optical waveguide formation, which has low transmission loss and can form a waveguide pattern with high shape accuracy at low cost; an optical waveguide; and a method for producing an optical waveguide. The present invention provides a photosensitive resin composition for optical waveguide formation comprising at least: a polymer containing at least a (meth)acrylate structure unit having an epoxy structure, and a (meth)acrylate structure unit having a lactone structure and/or a vinyl monomer structure unit having an aromatic structure; and a photoacid generator, of which one or both of a core layer and a cladding layer are formed of a cured product.
1. A photosensitive resin composition for optical waveguide formation comprising at least:
a polymer containing
a repeating structural unit represented by the following general formula (1), and
at least one of a repeating structural unit represented by the following general formula (2) and a structural unit represented by the following general formula (3);
a photoacid generator; and
an epoxy compound (except for a polymer containing a repeating structural unit represented by the general formula (1), a repeating structural unit represented by the general formula (2) and/or a repeating structural unit represented by the general formula (3)):
wherein R 1 represents hydrogen atom or methyl group and R 2 represents an organic group having an epoxy structure which is selected from the group consisting of
5,6-epoxy-2-bicyclo[2,2,1]heptyl group,
5-epoxyethyl-2-bicyclo[2,2,1]heptyl group,
6-epoxyethyl-2-bicyclo[2,2,1]heptyl group,
5,6-epoxy-2-bicyclo[2,2,1]heptylmethyl group,
3,4-epoxytricyclo[5.2.1.0 2,6 ]decyl group,
3,4-epoxytricyclo[5.2.1.0 2,6 ]decyloxyethyl group,
3,4-epoxytetracyclo[4.4.0.1 2,5 .1 7,10 ]dodecyl group, and
3,4-epoxytetracyclo[4.4.0.1 2,5 .1 7,10 ]dodecylmethyl group;
wherein R 3 represents hydrogen atom or methyl group and R 4 represents an organic group having a lactone structure;
wherein R 5 represents hydrogen atom or methyl group and R 6 represents an organic group having an aromatic structure;
wherein the repeating structural unit represented by the general formula (2) is selected from the group consisting of the following formulae:
wherein the repeating structural unit represented by the general formula (3) is selected from the group consisting of the following formulae:
2. The photosensitive resin composition for optical waveguide formation according to claim 1 , further comprising an oxetane compound.
3. The photosensitive resin composition for optical waveguide formation according to claim 1 , further comprising at least one additive selected from the group consisting of alumina, silica, glass, silicone and titanium oxide.
4. The photosensitive resin composition for optical waveguide formation according to claim 3 , wherein the additive has any one form selected from fiber, bead, liquid and powder.