Data storage disk

US4777632A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Franz Wenzel · Darmstadt, DE
• Peter J. Arndt · Seeheim-Jugenheim, DE
• Werner Siol · Pfungstadt, DE

Key dates

• Filing date: Jul 30, 1987
• Grant date: Oct 11, 1988
• Expiry date: Jul 30, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F220/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Data storage disks containing optically readable information made from a copolymer having low water absorption and good optical and mechanical properties, said copolymer being at least ternary and comprising PA1 (A) methyl methacrylate, and further comonomers selected from at least two of the groups PA1 (B) ##STR1## where R' is hydrogen or methyl and R" is hydrogen or alkyl, and (C) ##STR2## where R'" is aliphatic or alicyclic hydrocarbon, and (D) styrene and/or alpha-methyl styrene.