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Protective Coating for Magnetic Recording Surfaces

IP.com Disclosure Number: IPCOM000095723D
Original Publication Date: 1964-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Whitney, ML: AUTHOR

Abstract

A protective coating for electroplated magnetic recording surfaces such as tapes, discs, drums and the like is desirable. The protective coating saves the magnetic recording surface from wear and from loss of magnetic material. Further, it protects the magnetic surface from action of foreign materials and the atmosphere which tends to oxidize and thus degrade the electroplated ferromagnetic metallic surface. The protective coating must be of uniform thickness and be quite thin so that the spacing between the magnetic recording surface and the read-head is not so great as to cause a substantial loss of signal.

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Protective Coating for Magnetic Recording Surfaces

A protective coating for electroplated magnetic recording surfaces such as tapes, discs, drums and the like is desirable. The protective coating saves the magnetic recording surface from wear and from loss of magnetic material. Further, it protects the magnetic surface from action of foreign materials and the atmosphere which tends to oxidize and thus degrade the electroplated ferromagnetic metallic surface. The protective coating must be of uniform thickness and be quite thin so that the spacing between the magnetic recording surface and the read-head is not so great as to cause a substantial loss of signal.

The protective coating used is a cured blend of polymethylene polyphenyl isocyanate and the copolymer formed by the condensation of an aldehyde and a phenol. The particular phenol used may be any one or a combination of hydroxybenzene, resorcinol, cresols, xylenols, t-buty-phenols, naphthols, and the like. Any of the available aldehydes can be used such as formaldehyde, benzaldehyde, acetaldehyde, naththaldehyde and the like.

The polymethylene polyphenyl isocyanate is dissolved in monochlorobenzene, toluene or some other suitable solvent. The uncured thermosetting resinous condensate of an aldehyde and a phenol is dissolved in methyl ethyl ketone or some other suitable solvent by use of a high sheer mixer. These two solutions are then blended together with dilution to the required per cent solids for coating purpo...