| 摘要 |
PURPOSE:To obtain the title molding low in a double refraction to an oblique incident light and excellent in heat resistance, mechanical strengths, dimensional stability and adhesion to recording media, by mixing a specified copolymer with a polyphenylene ether. CONSTITUTION:80-99wt.% aromatic vinyl monomer (e.g., styrene) and 20-1wt.% carboxylated vinyl monomer (e.g., methacrylic acid) are bulk- polymerized or suspension-polymerized in the presence of a radical initiator to obtain a copolymer of a melt flow rate (at 230 deg.C under a load of 3.8kg) of 0.5-200. 30-70wt.% this copolymer is mixed with 70-30wt.% polyphenylene ether of the formula (wherein R<1-4> are each H, halogen or hydrocarbon group), having an intrinsic viscosity of 0.1-1.0 until these polymers are dispersed in the form of particles of 1mu or below, and mixture is injection-molded to obtain an optical resin molding having a transmittance (wavelength of 800nm, thickness of 1.2mm) >=75%.
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