Optical disk substrate

Details Optical disk substrate Optical disk substrate

1989-04-07

1991-02-05

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

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

Patent

active

049903861

ABSTRACT:
An optical disk substrate is disclosed, which is molded from a terpolymer composed of (A) an aromatic vinyl monomer, (B) cyclohexylmaleimide, and (C) at least one compound selected from the group consisting of (meth)acrylonitrile, isobornyl (meth)acrylate and cyclohexyl (meth)acrylate, with the cyclohexyl maleimide being copolymerized in an amount of from 5 to 60 wt % of said terpolymer. The optical disk substrate exhibits high heat resistance, low water absorption and low birefringence.

REFERENCES:
Jap. Abs. No. 89-231071/32, Showa Denko K.K., 6-29-89.
Jap. Abs. No. 86-160408/25, Toray Ind. Ins., 5-13-86.
CA, 109(20):171623d, Daicel/Chem. Ind. Ltd., 4-21-88.
Chemical Abstracts, vol. 111, No. 8, Aug. 21, 1989, p. 14, col. 1, Abstract No. 58547k.
Chemical Abstracts, vol. 111, No. 18, Oct. 30, 1989, p. 15, col. 1, Abstract No. 154589w.
World Patent Index, 1989, Abstract No. 231071/32 & Patent Abstracts of Japan, vol. 13, No. 436, Sep. 29, 1989.
Chemical Abstracts, vol. 107, No. 10, Sep. 7, 1987, p. 57, col. 2, Abstract No. 79076p.
Chemical Abstracts, vol. 108, No. 8, Feb. 22, 1988, p. 39, col. 1, Abstract No. 57183q.
Chemical Abstracts, vol. 107, No. 25, Dec. 21, 1987, p. 68, col. 2, Abstract No. 238259u.
Chemical Abstracts, vol. 106, No. 3, Jan. 19, 1987, p. 41, col. 1, Abstract No. 19624k.
Chemical Abstracts, vol. 105, No. 22, Dec. 1, 1986, p. 62, col. 1, Abstract No. 192445e.
Chemical Abstracts, vol. 100, No. 26, Jun. 25, 1984, p. 61, col. 2, Abstract No. 211313a.

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