Hydrated alumina binder system

Details Hydrated alumina binder system Hydrated alumina binder system

1985-03-21

1986-01-28

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

252 6254, 360134, 360135, 360136, 427128, 4283159, 4283171, 4283177, 428329, 428694, 428695, 428900, 4284259, G11B 570

Patent

active

045670960

ABSTRACT:
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 CO.sub.2 formation that creates the porosity occurs as the polyurethane components cure.

REFERENCES:
patent: 4135016 (1979-06-01), Ogawa
patent: 4404238 (1983-09-01), Baldwin
patent: 4405684 (1983-09-01), Blumentritt
patent: 4410440 (1983-10-01), Ito
patent: 4510203 (1985-04-01), Ogawa

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