Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1983-12-27
1986-06-17
Robinson, Ellis P.
Stock material or miscellaneous articles
Composite
Of inorganic material
252 6254, 360134, 360135, 360136, 427128, 427131, 427132, 428900, G11B 572
Patent
active
045956405
ABSTRACT:
An improved lubricant system for magnetic recording media such as helical scan video tapes is disclosed. The resulting improved magnetic recording media comprise the usual flexible or rigid backing and a magnetizable layer on the backing, but the lubricant is comprised of an organic compound selected from the group consisting of isomeric carboxylic acids and isomeric alcohols (e.g. iso-stearic acid and iso-stearyl alcohol). A fatty acid ester may be included in the lubricant.
A typical composition utilizes 0.5 parts by weight iso-stearic acid per 100 parts of magnetizable material (e.g., cobalt doped ferric oxide particles) and 1 part by weight of isopropyl palmitate per 100 parts of the magnetizable material. Video tapes lubricated with this new system, have shown improved electromagnetic output (e.g., higher signal-to-noise ratios). In addition, they are able to withstand the stop motion of a helical scan video head better than prior known lubricant systems.
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Tabor, D., "Friction, Adhesion and Boundary Lubrication of Polymers" in Advances in Polymer Friction and Wear, Polymer Science and Technology, vol. 5A, 1974.
Little D. B.
Minnesota Mining and Manufacturing Company
Robinson Ellis P.
Sell D. M.
Smith J. A.
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