Title:
OPTICAL DISK AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JPH02304742
Kind Code:
A
Abstract:
PURPOSE: To obtain an optical disk having small retardation, excellent optical homogeneity and high read-out sensitivity for the information recorded therein by using a specified polycarbonate resin and/or polyformal resin as a substrate.
CONSTITUTION: Polycarbonate resin and/or polyformal resin derived from 20 - 90 wt.% bis-anthracene compd. expressed by formula I is used as the substrate. In formula I, R1 - R2 represents H or lower alkyl or phenyl group with C1-4. Thereby, the obtd. optical disk has excellent shock resistance, heat resistance, moisture resistance, transparency, small retardation and excellent optical homogeneity, high read-out sensitivity of information and high reliability.
Inventors:
TAJIMA TETSUO
MIWA HIROAKI
SUDO RYOICHI
MIWA HIROAKI
SUDO RYOICHI
Application Number:
JP12435989A
Publication Date:
December 18, 1990
Filing Date:
May 19, 1989
Export Citation:
Assignee:
HITACHI LTD
HITACHI MAXELL
HITACHI MAXELL
International Classes:
B29D17/00; C08G64/00; C08G64/04; C08G65/38; C08L69/00; G11B7/24047; G11B7/24076; G11B7/24079; G11B7/24085; G11B7/24091; G11B7/2533; G11B7/2534; (IPC1-7): B29D17/00; C08G64/04; C08G65/38; C08L69/00; G11B7/24
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)