| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid curable resin composition which is excellent in storage stability as the liquid curable resin composition, little stains a transparent cylinder with evaporated components, when forming optical fiber coating layers, and gives cured coating films with large stress relaxation rate. SOLUTION: This liquid curable resin composition comprises (A) at least the following two urethane (meth)acrylate oligomers (A1) and (A2), (A1): a urethane (meth)acrylate oligomer which is a reaction product of (a) a polyetherpolyol, (b) a polyisocyanate, and (c) a hydroxy group-containing (meth)acrylate, and (A2): a urethane (meth)acrylate oligomer which is a reaction product of (b) a polyisocyanate with two or more kinds of different (c) hydroxy group-containing (meth)acrylates, (B) a compound represented by the following formula (1): CH<SB>2</SB>=CR<SP>1</SP>COOR<SP>2</SP>(R<SP>1</SP>is H or methyl; R<SP>2</SP>is a straight chain or branched chain 4 to 12C alkyl), and (C) a polymerization initiator. COPYRIGHT: (C)2007,JPO&INPIT
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