| abstract |
(57) Abstract: Provided is a liquid curable resin composition suitable as an optical fiber coating material, particularly a hard material, which can stably obtain a coated optical fiber having a uniform wire diameter even in high-speed drawing. thing. (A) A polymerizable compound having a (meth) acrylate group in a molecule, and (B) a number average molecular weight of 1,000. Less than 3% of reactive diluent and (C) a polymerization initiator, having a viscosity in the range of 500 to 3000 cP at 40 ° C., and a flow activation energy of 1 to 60 kJ / mo. The liquid curable resin composition in the range of l. |