LENS FOR SIGNAL DEVICE AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To provide a lens for a signal device with excellent transparency and heat resistance. SOLUTION: A lens for a signal device is obtained by hardening a resin composition containing the following components (A)-(C). (A) 30-60 pts.wt. of an unsaturated monomer mixture containing 20-90 wt.% unsaturated monomers consisting essentially of methyl methacrylate and 10-80 wt.% unsaturated monomers containing at least two double bonds capable of radical polymerization within a molecule is included. (B) 40-70 pts.wt. of resin particles comprising a polymer of unsaturated monomers consisting essentially of methyl methacrylate containing 20-100 wt.% partially cross-linked resin particles and 0-80 wt.% non-cross-linked resin particles is included. (C) 0.1-5 pts.wt. of a radical initiator per 100 pts.wt. of sum of components (A) and (B) is included.