Optical disk substrate and optical information-storage medium

Details Optical disk substrate and optical information-storage medium Optical disk substrate and optical information-storage medium

1991-03-04

1993-06-01

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428412, 428913, 430945, 346 76L, 3461351, 369288, B32B 300

Patent

active

052157997

ABSTRACT:
Disclosed is an optical disk substrate which comprises a polycarbonate resin containing not more than 1 ppm of each metal belonging to the IA group and the VIII group of the Periodic Table, and not more than 0.3 mol percent, per polymerization repeating unit, of a terminal hydroxyl group. Also disclosed is an optical information-storage medium comprising an optical recording layer formed on the optical disk substrate.

REFERENCES:
patent: 3981707 (1976-09-01), Araujo et al.
patent: 4199540 (1980-04-01), Adelmann et al.
patent: 4509163 (1985-04-01), Kamada et al.
patent: 4701770 (1987-10-01), Ito et al.
patent: 4918160 (1990-04-01), Kondoh et al.

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