Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1988-09-09
1990-11-27
Thibodeau, Paul J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
428480, 428692, 428900, G11B 2300
Patent
active
049735152
ABSTRACT:
Disclosed herein is a magnetic card comprising a monoaxially or biaxially stretched minute-cellular polyester film which has an apparent density of 0.4 to 1.3 g/cm.sup.3 and an opacifying power of 0.2 or more and a magnetic layer applied on at least one surface of said film.
By using the polyester film containing small air bubbles as the base material of the magnetic card, flexibility, flatness and punching property, which were insufficient in a magnetic card using a conventional polyester film, are improved.
REFERENCES:
patent: 3755499 (1973-08-01), Heijo et al.
patent: 3937754 (1976-02-01), Shimotsuma et al.
patent: 4654249 (1987-03-01), Barbey et al.
patent: 4670319 (1987-06-01), Katoh et al.
patent: 4781963 (1988-11-01), Utsumi et al.
patent: 4857396 (1989-08-01), Otonari et al.
Akatsu Kazuyuki
Masuda Narihiro
Otonari Satoshi
Sato Yoshinori
Buckley Linda M.
Conlin David G.
Diafoil Company, Ltd.
Thibodeau Paul J.
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