Information signal recording disc

Details Information signal recording disc Information signal recording disc

1977-06-08

1978-11-14

Ansher, Harold

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

260 297T, 260879, 274 41A, 274 416S, 428520, 428522, 526328, 526329, H04N 128, H04N 130, C08L 902, B32B 2732

Patent

active

041256549

ABSTRACT:
A phonograph or video disc comprises at least one unsaturated 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.degree. to 120.degree. C, an absorbed impact energy of at least 0.5kg.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.

REFERENCES:
patent: 2997451 (1961-08-01), Miller
patent: 3130065 (1964-04-01), Manning et al.
patent: 3549725 (1970-12-01), Rose et al.
patent: 3690946 (1972-09-01), Hartmann et al.
patent: 3730767 (1973-05-01), Akashi et al.
patent: 3832274 (1974-08-01), Owston
patent: 4046932 (1977-09-01), Hartmann et al.
patent: 4057831 (1977-11-01), Jacobs et al.
patent: 4058649 (1977-11-01), Steiner
patent: 4065521 (1977-12-01), Lachowicz et al.

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