Information signal recording disc

Details Information signal recording disc Information signal recording disc

G - Physics

11

B

352/31.3

G11B 19/00 (2006.01) C08L 33/18 (2006.01) G11B 3/70 (2006.01)

Patent

CA 1089564

ABSTRACT OF THE DISCLOSURE A audio or video disc comprises at least one nitrile copolymer and has therein an unsaturated nitrile content of from 40 to 90 percent by weight, and the disc exhibits a Clash-Berg flex temperature of from 50 to 120°C, an absorbed impact energy of at least 0.5 kg.cm. when tested with a test specimen thereof of a 2-mm. thickness by a Dynstat impact test according to BS-1330-1946, and a Shore D hardness of from 75 to 95.

280281

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