Resin composition, optical fiber, optical fiber manufacturing method, optical fiber ribbon, and optical fiber cable

Abstract

A resin composition for primary coating of an optical fiber contains photopolymerizable compounds including a bifunctional urethane (meth)acrylate (A) and a monofunctional urethane (meth)acrylate (B), a photopolymerization initiator, and a silane coupling agent, in which the urethane (meth)acrylate (A) is a reaction product of a diol having a number average molecular weight of 8000 or more and 20000 or less, a diisocyanate, and a hydroxyl group-containing (meth)acrylate, a total amount of vinyl groups in 100 parts by mass of a total amount of the resin composition is 70 mmol or more and 200 mmol or less, and a ratio of an amount of vinyl groups of the urethane (meth)acrylate (B) with respect to an amount of vinyl groups of the urethane (meth)acrylate (A) is 3.7 or more and 15.0 or less.

Dependencies are inferred from the claim text.