Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1975-04-02
1976-11-30
Lesmes, George F.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
427127, 428148, 428424, 428900, H01F 1000
Patent
active
039950891
ABSTRACT:
A magnetic recording medium in the form of a card having a non-magnetic support with a magnetic coating on one side of the support and a backcoating on the opposite side of the support, which backcoating exhibits improved scratch resistance and adherence to the support and improved frictional characteristics and consists essentially of 20 to 50% by weight of a binder mixture containing 10 to 60% by weight of an elastomeric polyurethane and, incorporated in the binder mixture, a non-magnetic pulverulent mixture of 10 to 40% by weight of conductive carbon powder and 60 to 90% by weight of platelet-shaped and spherical particles.
REFERENCES:
patent: 2804401 (1957-08-01), Cousino
patent: 3293066 (1966-12-01), Haines
patent: 3617378 (1971-11-01), Beck
patent: 3687725 (1972-08-01), Hartmann et al.
patent: 3734772 (1973-05-01), Shell et al.
Felleisen Peter
Hartmann Hans-Joerg
Hartmann Job Werner
Klein Ursula
Mayer Dieter
Badische Anilin- & Soda-Fabrik Aktiengesellschaft
Lesmes George F.
Roche R. J.
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