Thermoplastic resin base film for magnetic recording medium

Details Thermoplastic resin base film for magnetic recording medium Thermoplastic resin base film for magnetic recording medium

1985-02-20

1986-02-04

McCamish, Marion C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428147, 428149, 428152, 428201, 428206, 428327, 428330, 428333, 428336, 428447, 428480, 428481, 428483, 428694, 428900, 428910, H01F 1004

Patent

active

045686009

ABSTRACT:
A thermoplastic resin base film for a magnetic recording medium including a thermoplastic resin film and a discontinuous film adhering closely to at least one surface of the thermoplastic resin film. The discontinuous film has a thickness of not larger than 500 angstroms and is composed of a polymer blend containing fine particles. The polymer blend comprises a water-soluble polyester copolymer and a water-soluble polymer having at least one hydroxyl group in the recurring unit thereof. Fine protrusions are formed on the discontinuous film due to the presence of the fine particles therein. A magnetic recording medium using the base film is suitable for high density magnetic recording and has extremely excellent durability to repeated use.

REFERENCES:
patent: 4233352 (1980-11-01), Ono et al.
patent: 4489117 (1984-12-01), Ono et al.

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