| 摘要 |
PURPOSE:To obtain a methacrylic resin excelling in heat resistance and flow without detriment to its excellent optical properties by copolymerizing methyl methacrylate with phenyl acrylate in a specified ratio. CONSTITUTION:A methacrylic resin comprising 80-99.5 wt. % methyl methacrylate units and 20-0.5wt.% phenyl acrylate units. When the content of methyl methacrylate units is above 99.5wt.%, the molecular weight must be decreased in order to maintain its molding flow, and therefore the mechanical strengths are decreased. When the content of phenyl acrylate units is above 20wt.%, the mechanical strengths are markedly decreased. To produce the methacrylic resin, a conventional method for producing a methacrylic resin such as suspension polymerization, bulk polymerization or the like can be used. the obtained methacrylic resin can be molded into a substrate by injection molding or compression molding. |
