Optical data storage media. Davis, Gary Charles; Rosenquist, Niles Richard; Sybert, Paul Dean; Dhinojwala, Ali; Hubbard, Steven F.; King, Joseph Anthony, Jr.; Raymond, Paul Cletu, Iii; Van, Hout Ruud; Ishiwa, Kenichi. (General Electric Company, USA). PCT Int. Appl. (2000), 26 pp. CODEN: PIXXD2 WO 0062287 A1 20001019 Designated States W: CN, JP, SG. Designated States RW: AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE. Patent written in English. Application: WO 99-US8042 19990413. CAN 133:315680 AN 2000:742386 CAPLUS

Patent No. Kind Date Application No. Date

WO 2000062287 A1 20001019 WO 1999-US8042 19990413

W: CN, JP, SG

RW: AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE

There is provided herein an optical storage media which has low vertical birefringence (VBR). In a preferred embodiment, there is provided an optical disk comprising a genus of copolycarbonates, including copolyestercarbonates, which have excellent phys. and optical properties. Said copolycarbonates have proportions of structural units which fall within a specific compn. range, and said range defines certain materials, a large percentage of which can be molded into optical disks having the desired optical properties, including low VBR.