International Business Machines Corporation

Max R Lorenz

Andrew M Homola

Guido Galli

Karl H Loeffler

Charles Chiou

Heinrich Sussner

Calvin A Bruce

A monolayer magnetic coating is prepared by applying magnetic particles which have an electrostatic charge in an aqueous environment to an active layer on a substrate, the active layer having an electrostatic charge in an aqueous environment opposite to the charge on the magnetic particles so that the particles bond to the active layer. The concentration of the electrolyte in which the charged particles are dispersed is adjusted to reduce the coulombic repulsive forces between the particles, permitting them to move close together and thereby increasing the magnetic particle packing in the resultant magnetic coating.

Increasing magnetic particle concentration in magnetic coatings

A method for producing a magnetic recording composition involves preparing an aqeuous dispersion of magnetic particles and colloidal silica particles, the pH of this dispersion being adjusted so that the magnetic and silica particles are electrostatically attracted to and bond to each other, removing the water from the dispersion, and dispersing the silica-coated magnetic particles in an organic liquid binder system for application to a recording substrate.

Mono-particle magnetic dispersion in organic polymers for magnetic

A monolayer magnetic coating is prepared by applying magnetic particles which have an electrostatic charge in an aqueous environment to an active layer on a substrate, the active layer having an electrostatic charge in an aqueous environment opposite to the charge on the magnetic particles so that the particles bond to the active layer.

Preparation of thin, aligned magnetic coatings

A nozzle array structure for pressurized fluid jets includes a uniform deposited membrane having an array of uniform small orifices therein overlaying a planar substrate having an array of larger aperture openings therethrough with approximately the same central axes as the orifice array. The method of making includes forming a substrate of a planar single crystal material oriented with the (100) planes parallel to the surface. A membrane comprising a uniform coating of an inorganic material is applied to the planar surface of the substrate. The substrate is preferentially etched from the rear surface to form an array of openings therein extending therethrough to the membrane. The membrane is then selectively eroded to form an array of uniform small orifices therein.

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San Jose, CA, United States of America

Max R Lorenz