Patent ID: 8383695

Claim:
A resin composition comprising (A) a phenoxy resin for an optical material, (B) a polymerizable compound, and (C) a polymerization initiator, wherein the resin composition is capable of use in an optical waveguide, wherein the polymerizable compound (B) is at least one compound containing an ethylenically unsaturated group in a molecule thereof, wherein the phenoxy resin for an optical material is obtained by subjecting at least one selected from difunctional epoxy resins represented by the following Formulas (1) to (5) and at least one selected from difunctional phenols represented by the following Formulas (6) to (9) to polyaddition reaction, wherein a film comprising the above phenoxy resin has a refractive index of 1.580 or less at 25° C. and a wavelength of 830 nm: (wherein n 1 represents an integer of 0 to 5, and m represents an integer of 2 to 10); (wherein n 2 represents an integer of 0 to 5); (wherein n 3 represents an integer of 0 to 5); (wherein n 4 represents an integer of 0 to 5); (wherein p represents an integer of 2 to 10, and q represents an integer of 1 to 5); (wherein R 1 and R 2 each represent independently any of a hydrogen atom, a fluorine atom, an organic group having 1 to 12 carbon atoms and a fluorine-containing organic group having 1 to 12 carbon atoms); (wherein R 3 , R 4 and R 5 each represent independently any of a hydrogen atom, a fluorine atom, an organic group having 1 to 12 carbon atoms and a fluorine-containing organic group having 1 to 12 carbon atoms); (wherein R 6 , R 7 , R 8 and R 9 each represent independently any of a hydrogen atom, a fluorine atom, an organic group having 1 to 12 carbon atoms and a fluorine-containing organic group having 1 to 12 carbon atoms); (wherein R 10 , R 11 , R 12 and R 13 each represent independently any of a hydrogen atom, a fluorine atom, an organic group having 1 to 12 carbon atoms and a fluorine-containing organic group having 1 to 12 carbon atoms, and r represents an integer of 2 to 10), and wherein a blending amount of the component (A) is 10 to 85 mass % based on the total amount of the component (A) and the component (B); a blending amount of the component (B) is 15 to 90 mass % based on the total amount of the component (A) and the component (B); and a blending amount of the component (C) is 0.1 to 10 mass % based on the total amount of the component (A) and the component (B).