Optical disc |
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| 申请号 | JP23317186 | 申请日 | 1986-10-02 | 公开(公告)号 | JPS6389524A | 公开(公告)日 | 1988-04-20 |
| 申请人 | Daicel Chem Ind Ltd; | 发明人 | SUGANO TATSUYA; TAKAHASHI IKUO; SASAKI KENICHI; | ||||
| 摘要 | PURPOSE:To obtain an optical disc exhibiting a small double refraction when laser beams run through it, by using low-photoelastic constant aromatic polycarbonate copolymer produced by using two specified bisphenol compounds as a base material. CONSTITUTION:97-3mol% 2,2-bis(4-hydroxyphenyl)butane of formula I is mixed with 3-97mol% 4,4'-dihydroxy-2,2,2-triphenylethane of formula II. This mixture is transesterified with diphenyl carbonate or polycondensed with phosgene to produce an aromatic polycarbonate copolymer. An optical information recording disc on which a signal is recorded by using laser beams and from which the recorded signal is read by reflection or transmission of laser beams is produced by using the above copolymer as a base material. | ||||||
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