| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid curable resin composition excellent in flexibility and mechanical strength and suitable for forming an optical-fiber primary coating material.SOLUTION: The liquid curable resin composition is a radiation-curable resin composition which contains (A) a urethane oligomer which contains a reaction product of an aliphatic polyether diol, a diisocyanate and a monohydric alcohol; or a urethane oligomer which is obtained by reacting a monohydric alcohol with a reaction product of an aliphatic polyether diol and a diisocyanate and then reacting with a hydroxyl-containing (meth)acrylate, (B) a monofunctional acrylic monomer, and (C) a polyfunctional acrylic monomer with a content of 2 mass% or less. |
