Title:
【発明の名称】光学式デイスク
Document Type and Number:
Japanese Patent JP2515993
Kind Code:
B2
Abstract:
PURPOSE:To obtain a low-photoelastic constant aromatic polycarbonate copolymer for optical discs, by bonding 1,1'-bis(4-hydroxyphenyl)-p-diisopropylbenzene to 1,1-bis(4-hydroxyphenyl)cyclohexane through a carbonate bond. CONSTITUTION:This optical disc is formed from an aromatic polycarbonate copolymer obtained by bonding 97-3mol% 1,1'-bis(4-hydroxyphenyl)-p- diisopropylbenzene with 3-97mol% 1,1-bis(4-hydroxyphenyl)cyclohexane through a carbonate bond. The viscosity-average MW of this copolymer is preferably 13,000-50,000.
Inventors:
SUGANO TATSUYA
TAKAHASHI IKUO
IGUCHI YOSHIHIRO
TAKAHASHI IKUO
IGUCHI YOSHIHIRO
Application Number:
JP23318286A
Publication Date:
July 10, 1996
Filing Date:
October 02, 1986
Export Citation:
Assignee:
DAICEL CHEM
International Classes:
B41M5/26; C08G64/00; C08G64/16; G02B1/04; G11B7/24047; G11B7/2534; G11B11/10; G11B11/105; (IPC1-7): C08G64/16; B41M5/26; G02B1/04; G11B7/24