Methacrylic resin composition for optical discs

Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product

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430270, 430945, 3461351, 524310, 524312, 524315, 524317, 524318, 524385, G03C 100

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052524400

ABSTRACT:
A methacrylic resin composition for optical discs comprising 100 parts by weight of a copolymer composed of from 95 to 99.7% by weight of methyl methacrylate (A) and from 0.3 to 5% by weight of at least one monomer (B) selected from the group consisting of methyl acrylate, ethyl acrylate and butyl acrylate, and having a heat distortion temperature of at least 95.degree. C., a melt flow rate of from 1.0 to 10.0 g/10 min and a tensile strength of at least 660 kg/cm.sup.2, and from 0.05 to 2.0 parts by weight of at least one releasing agent (C) selected from the group consisting of a fatty acid alkyl ester of the formula R.sub.1 COOR.sub.2 wherein each of R.sub.1 and R.sub.2 is an alkyl group having from 5 to 20 carbon atoms, cetanol and a stearic acid glycerol ester.

REFERENCES:
patent: 2939898 (1960-06-01), Aron
patent: 4481324 (1984-11-01), Hall et al.
patent: 4510279 (1985-04-01), Kishimura et al.
European Patent Office Communication.
Patent Abstracts of Japan, unexamined applications, C.field, vol. 6, No. 219, Nov.2,1982 p. 96 C. 132.

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