Flexible magnetic disc sheet

Details Flexible magnetic disc sheet Flexible magnetic disc sheet

1985-05-07

1987-06-09

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

427 44, 427128, 427131, 428 64, 428323, 428324, 428325, 428327, 428329, 428340, 428694, 428900, 4284259, G11B 570

Patent

active

046719784

ABSTRACT:
A flexible magnetic disc sheet is described, which has a central circular hole therein and has a protective layer only on a surface portion surrounding the edge of the central circular hole, the protective layer comprising (a) a radiation polymerized polymer of a compound which is polymerizable and hardenable by radiation and (b) a matting agent.

REFERENCES:
patent: 3466156 (1969-09-01), Peters
patent: 3681225 (1972-08-01), Genma
patent: 4239828 (1980-12-01), Knope
patent: 4335183 (1982-06-01), Hosaka
patent: 4368239 (1983-01-01), Nakajima
patent: 4387114 (1983-06-01), Conner
patent: 4404247 (1983-09-01), Dominquez-Burguette
patent: 4434210 (1984-02-01), Nakajima
patent: 4486500 (1984-12-01), Naruo
patent: 4523246 (1985-06-01), Okuzawa
patent: 4539220 (1985-09-01), Martinelli
patent: 4578299 (1986-03-01), Kato
patent: 4581270 (1986-04-01), Kato

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