Memorex Corporation

Memorex Telex N.v.

Fred C Chung

Ross P Clark

Dennis W Karle

Zie A Payne

Frederic J Sischka, Ii

Compositions for magnetic recording media comprising a nonmagnetic support and a magnetic layer adhered to the nonmagnetic support, wherein the magnetic layer comprises a ferromagnetic substance and a binder system, preferably the binder system comprises primarily a polyester polyurethane polymer and small percentage amounts of a low molecular weight polyol crosslinked with a multifunctional isocyanate. Methods of formation of the compositions are also described. Presence of the low molecular weight polyol is particularly important in attaining desired performance characteristics in wound pile stability, layer-to-layer adhesion, and durability.

Magnetic recording medium comprising a polyester polyurethane polymer

Fabrication of magnetic recording media having a coating containing harsh pigment like CrO.sub.2 particles and adapted for frequent contact with a head, with good durability, abrasivity, etc., accommodated by using a lubricant system including a fluoro-silicone oil and a compatible fatty-acid-ester like butoxy ethyl stearate.

Fabrication of magnetic recording medium with lubricant

A novel resinous binder composition is disclosed for a magnetic recording tape or like media. Magnetic particles are dispersed within a resinous matrix having both a 'hard' and a 'soft' component. The 'hard' component is fabricated by exposing a resin capable of being cured by electron beam irradiation. The magnetic recording media coating is very apt for use with harsh pigment like CrO.sub.2 particles and is adapted for frequent contact with a head, being adapted to exhibit good durability, abrasivity, etc. by virtue of using a lubricant system including a fluoro-silicone oil and a compatible fatty-acid-ester like butoxy ethyl stearate.

Radiation-cured recording composition with bi-part lube

Magnetic recording media having a coating containing harsh pigment like CrO.sub.2 particles and adapted for frequent contact with a head, with good durability, abrasivity, etc., accommodated by using a lubricant system including a fluoro-silicone oil and a compatible fatty-acid-ester like butoxy ethyl stearate.

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Palo Alto, CA, United States of America

Fred C Chung