LIQUID CURABLE RESIN COMPOSITION.

摘要

PURPOSE:To obtain a liquid curable resin composition suitable for a cladding material of optical fiber which has a high Young's modulus, a small shrinkage stress and also high toughness, curability and reliability by blending a specific urethane (meth)acrylate and a specific polymerizable monofunctional vinyl monomer with a polymerization initiator. CONSTITUTION:The title composition comprises a urethane (meth)acrylate having 3 or more ring structures in the molecule, a polymerizable monofunctional vinyl monomer whose homopolymer has a glass transition point of 50 deg.C or above, and a polymerization initiator, the concentration of the urethane bond in the composition being 2.0X10<-3> mol/g or more.