Method for forming protective layer on a flexible magnetic disc

Details Method for forming protective layer on a flexible magnetic disc Method for forming protective layer on a flexible magnetic disc

1986-07-31

1987-09-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

427214, 427 541, 427128, 427131, 428212, 428216, 428137, 428195, 428694, 428695, 428900, G11B 572

Patent

active

046968466

ABSTRACT:
A method for forming protective layer on a surface portion surrounding the edge of a central aperture of a flexible magnetic disc sheet is described, comprising providing a radiation polymerizable composition on a surface portion surrounding the edge of the central aperture of the flexible magnetic disc sheet by screen printing, and hardening the composition by exposure to radiation; a flexible magnetic disc is also described, wherein a protective layer by the foregoing method is provided, with said protective layer having an inner diameter larger than the diameter of the aperture of the disc sheet and an outer diameter smaller than the diameter of the aperture of a jacket enclosing the disc sheet.

REFERENCES:
patent: 3466156 (1969-09-01), Peters
patent: 3681225 (1972-08-01), Genma
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patent: 4368239 (1983-01-01), Nakajima
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patent: 4539220 (1985-09-01), Martinelli
patent: 4578299 (1986-03-01), Kato
patent: 4581270 (1986-04-01), Kato
patent: 4652480 (1987-03-01), Kato

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