| 摘要 |
PROBLEM TO BE SOLVED: To provide a urethane resin composition, a hardened body and an optical semiconductor device, which are excellent in heat resistance and thermal discoloration resistance.SOLUTION: The urethane resin composition includes (A) a polyol component and (B) a polyisocyanate component. The polyisocyanate component (B) contains 30 mass% or more, based on the total amount of the polyisocyanate component (B), of one or both of a bifunctional or trifunctional alicyclic polyisocyanate having at least one isocyanate group bonded to secondary carbon atom and a prepolymer with residual isocyanate group of the alicyclic polyisocyanate, and the ratio of the isocyanate group equivalent of the polyisocyanate component (B) to the hydroxy group equivalent of the polyol component (A) (isocyanate group equivalent/hydroxy group equivalent) is larger than 1.0 and 1.4 or less. |
