Manufacture of base for optical disc

Abstract

Abstract PURPOSE:To obtain under favorable mold releasing properties and easily the title base which has reproduced accurately a mold surface and is cloudless, by performing cast molding of an epoxy resin composite by making a thin film made of SiC formed on the inside of casting mold through a spattering method into a mold release film. CONSTITUTION:A thin film made of SiC is formed generally in a thickness of 500-3,000Angstrom on the inside of a casting mold through either a spattering method or a reactive vacuum metallizing method. Then the transparent target base is obtained by a method wherein a mixture of cycloaliphatic epoxy esin or said resin with aromatic epoxy resin and an epoxy resin composite containing an organic polybasic acid anhydride, cure accelerating agent and discoloration inhibitor are casted within a casting mold, for which said thin film is made into a mold release film, and made to cure.

Inventors

• 👤 Shoichi Nakayama
• 👤 正一 中山
• 👤 Morio Tsuge
• 👤 柘植　盛男

Bibliographic Details