| 摘要 |
PURPOSE:To obtain a resin having excellent flame retardance as well as optical and mechanical properties, by copolymerizing a monomeric mixture consisting of specific amounts of styrene, methyl methacrylate and bisalkylvinyl phosphonate compound. CONSTITUTION:A monomeric mixture consisting of 20-80wt% styrene, 15-75wt% methyl methacrylate and 5-30wt% bisalkylvinyl phosphonate compound expressed by the formula [R is -CnH2n- (n is 1, 2 or 3; X1-X3 are H or Cl; X is Cl or Br], e.g. bis(beta-chloroethyl)vinyl phosphonate, etc., is copolymerized to afford the aimed flame-retardant resin having preferably 0.03-0.1l/g intrinsic viscosity [eta] measured in chloroform at 25 deg.C. This resin is used for electronic and electric parts, OA device parts, building materials, signboards, etc.
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