Title:
【発明の名称】ポリカ-ボネ-ト共重合体
Document Type and Number:
Japanese Patent JP2575683
Kind Code:
B2
Abstract:
PURPOSE:To obtain a polycarbonate copolymer having low photoelastic coefficient and extremely useful for an optical information recording disk recordable with laser beam, by bonding two specific kinds of bisphenols through a carbonate bond. CONSTITUTION:The objective copolymer can be produced by bonding 95-5mol% 1,1'-bis(4-hydroxyphenyl)-m-diisopropylbenzene of formula I and 5-95mol% 2,2-bis(4-hydroxy-3-tert-butylphenyl)propane of formula II through a carbonate bond. The viscosity-average molecular weight of the copolymer is preferably 13,000-50,000. The formation of the carbonate bond is carried out by the use of a potassium-based catalyst.
Inventors:
SUGANO TATSUYA
SASAKI KENICHI
TAKAHASHI IKUO
SASAKI KENICHI
TAKAHASHI IKUO
Application Number:
JP2025287A
Publication Date:
January 29, 1997
Filing Date:
January 30, 1987
Export Citation:
Assignee:
DAICEL CHEM
International Classes:
G02B1/04; B41M5/26; C08G64/00; C08G64/06; G11B7/24047; G11B7/2534; (IPC1-7): C08G64/06
Attorney, Agent or Firm:
Furuya Kaoru