Method of manufacturing a magnetic recording element

Details Method of manufacturing a magnetic recording element Method of manufacturing a magnetic recording element

1981-12-14

1983-05-17

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

427127, 427132, 427343, B05D 512

Patent

active

043840124

ABSTRACT:
A magnetic recording element with a carrier and a magnetic coating which comprises a magnetic pigment dispersed in a binder in which the sulphate ions present on the surface of the pigment particles are bound in the form of a water-insoluble salt, as well as methods of manufacturing the magnetic recording element in which the magnetic pigment or a non-magnetic FeOOH pigment from which the magnetic pigment can be manufactured is treated with an aqueous solution of a water-soluble salt the cations of which form water-insoluble salts with the sulphate ions present on the surface of the pigment particles and the treated pigment is then processed according to known methods to a magnetic recording element or in which the above-mentioned salt is mixed with the ingredients of the magnetic coating and the resulting magnetic coating lacquer is provided on a carrier and dried.

REFERENCES:
patent: 3904540 (1975-09-01), Bennetch et al.
patent: 4268540 (1981-05-01), Scott et al.
patent: 4303699 (1981-12-01), Tamura

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