G - Physics – 11 – B
Patent
G - Physics
11
B
117/24.4
G11B 5/702 (2006.01) C08G 18/30 (2006.01) H01F 10/00 (2006.01)
Patent
CA 1226765
ABSTRACT OF THE DISCLOSURE HYDRATED ALUMINA BINDER SYSTEM The composition and method of making a magnetic recording media using a polyurethane binder system with high lubricant retention and a high concentration of magnetic particles is described. The use of hydrated alumina with a solvent blocked isocyanate is used to produce an open cell microporosity in the cured coating wherein the individual voids are not greater than the magnetic bit cell size and the alumina particles remain in the coating to improve abrasion resistance. The porosity size is controlled by a surface active agent additive. Also shown is the method of preparing hydrated alumina with small particle size, dispersibility, and compatibility, and wherein the dehydrating temperature has the same range as the isocyanate deblocking temperature whereby the CO2 formation that creates the porosity occurs as the polyurethane components cure.
495658
Piltingsrud Douglas H.
Shen John C.s.
International Business Machines Corporation
Saunders Raymond H.
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