Polycarbonate copolymer containing oxaspiroundecane group and pr

Details Polycarbonate copolymer containing oxaspiroundecane group and pr Polycarbonate copolymer containing oxaspiroundecane group and pr

1996-12-19

1999-01-12

Buttner, David

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

528196, 528204, C08G 6406

Patent

active

058584994

ABSTRACT:
A polycarbonate copolymer which consists essentially of 5 to 95 mol % of recurring units containing a specific spiroglycol unit and 95 to 5 mol % of recurring units containing a specific biphenol unit, and has a reduced viscosity (.eta..sub.sp /c), measured at 20.degree. C. in a solution containing methylene chloride as a solvent and having a concentration of 0.5 g/dl, of at least 0.3 dl/g, a photoelasticity coefficient of 70.times.10.sup.-13 cm.sup.2 /dyne or less, and a glass transition temperature of at least 95.degree. C.; and a process for the production thereof. This polycarbonate copolymer is useful as a material for an information transmission medium or an information recording medium.

REFERENCES:
patent: 2945008 (1960-07-01), Caldwell et al.
patent: 4495345 (1985-01-01), Kawakami et al.
patent: 5021541 (1991-06-01), Masumoto
Chemical Abstract 116:195635 (of J04008761).
Patent Abstracts of Japan, vol. 12, No. 248 (C-511), 13 Jul. 1988 & JP 63 035619 A (Hitachi Ltd.) 16 Feb. 1988.

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