| 摘要 |
PURPOSE:To manufacture an optical element superior in optical isotropy, heat resistance and mechanical properties, by making the number of particulates of a foreign matter of 1mum or larger in resin into 10,000 pieces/g or less. CONSTITUTION:A resin composition composed of a polymer part mainly composed of an aromatic vinyl monomer and a polyphenylene ether part is dissolved into an organic solvent. Then after particulates of a foreign matter of 1mum or larger in the said resin have been made into 10,000 pieces/g or less by either recovering the same through filtration or passing the said resin through a sintered metallic filter after the resin has been molten, optical elements such as an optical card, lens, prism and optical disk base are manufactured by fusing and molding the same. An optical disk superior in heat resistance and possessing a sufficiently high C/N ratio at the time of reproduction of a record can be manufactured. |
