Magnetic recording element having a lubricative and protective c

Details Magnetic recording element having a lubricative and protective c Magnetic recording element having a lubricative and protective c

1985-07-29

1987-08-25

Lesmes, George F.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

427127, 427130, 427189, 427195, 427365, 428336, 428421, 428422, 428694, 428695, 428900, B32B 302, G11B 572, G11B 582

Patent

active

046892540

ABSTRACT:
A magnetic recording element comprised of a substrate having a magnetic recording layer disposed thereon is provided with a smooth uniform transparent lubricative and protective coating. The coating, which is composed of a telomer of tetrafluoroethylene, overlies the magnetic recording layer and also extends deeply into the topographical irregularities thereof so as to be strongly bonded thereto. To form the coating, a dispersion composed of particles of a telomer of tetrafluoroethylene dispersed in a liquid medium is applied to the surface of the magnetic recording layer, the liquid medium is removed to leave the telomer on the surface in the form of an opaque particulate film, and the particulate film is compacted, such as by use of buffing and calendering steps, to force telomer particles into the magnetic recording lever and to form a smooth uniform continuous layer of telomer over the surface of the magnetic recording layer. The coating is particularly useful as a lubricative and protective coating for high density floppy disks.

REFERENCES:
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patent: 4128673 (1978-12-01), Watanabe et al.
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patent: 4232072 (1980-11-01), Pardee
patent: 4267238 (1981-05-01), Chernega
patent: 4268556 (1981-05-01), Pedrotty
patent: 4390562 (1983-06-01), Yanagisawa
patent: 4419404 (1983-12-01), Arai et al.
patent: 4499121 (1985-02-01), Yamaguchi et al.
patent: 4526833 (1985-07-01), Bargnette et al.
IBM Technical Disclosure Bulletin; vol. 24, no. 11A, Apr. 1982, pp. 5477.

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