Optical waveguide forming epoxy resin composition, optical waveguide forming curable film, light transmission flexible printed board, and production method for the flexible printed board

摘要

An optical waveguide forming epoxy resin composition is free from a diluent component irrelevant to a curing reaction, and comprises:
(A) a liquid epoxy resin; and(B) a photoacid generator;
wherein the liquid epoxy resin (A) comprises a liquid epoxy resin represented by the following general formula (1) in a proportion of 40 to 75 wt % based on the overall amount of a resin component:;
wherein R1 and R2 are each a hydrogen atom or a methyl group; R3 to R6 are each a hydrogen atom, a methyl group, a chlorine atom or a bromine atom; X is a C2 to C15 alkylene group, an ethyleneoxy group, a di(ethyleneoxy) group, a tri(ethyleneoxy) group, a propyleneoxy group, a propyleneoxypropyl group, a di(propyleneoxy)propyl group or a tri(propyleneoxy)propyl group; and n is a natural number and has an average value of 1.2 to 5.

主权项

1. An optical waveguide forming epoxy resin composition comprising:
(A) a liquid epoxy resin; and (B) a photoacid generator;
wherein the liquid epoxy resin (A) comprises a liquid epoxy resin represented by the following general formula (I) as a major component thereof in a proportion of 50 to 75 wt % based on the overall amount of a resin component: wherein R1 and R2 are each a hydrogen atom or a methyl group;wherein R3 to R6 are each a hydrogen atom, a methyl group, a chlorine atom or a bromine atom;wherein X is a C2 to C15 alkylene group, an ethyleneoxy group, a di(ethyleneoxy) group, a tri(ethyleneoxy) group, a propyleneoxy group, a propyleneoxypropyl group, a di(propyleneoxy)propyl group or a tri(propyleneoxy)propyl group;wherein n is a natural number and has an average value of 1.2 to 5,wherein the optical waveguide forming epoxy resin composition is free from a diluent component irrelevant to a curing reaction,wherein the optical waveguide forming epoxy resin composition is free from a solid epoxy resin component, andwherein the optical waveguide forming epoxy resin composition has a viscosity satisfying the following conditions: (x) the viscosity is 12.6 to 99.7 Pa·s as measured at 25° C.; and (y) the viscosity is 1.2 to 5.2 Pa·s as measured at 50° C. with heating.