Electrophoretic method of producing high-density magnetic record

Details Electrophoretic method of producing high-density magnetic record Electrophoretic method of producing high-density magnetic record

1986-01-27

1988-01-12

Demers, Arthur P.

Compositions

Magnetic

With wax, bitumen, resin, or gum

2041806, 252 6253, 427128, 427130, 428407, 428694, 428900, C04B 3504, H01F 100, H01F 126

Patent

active

047190264

ABSTRACT:
A magnetic recording medium having a coating of magnetic particles deposited thereon by electrophoresis. Magnetic particles are encapsulated by dry milling in a thermoplastic binder which is insoluble at ambient or room temperatures and is softenable at temperatures higher than 70.degree. C. A charge director for producing functional sites in the higher is incorporated in the encapsulating polymer during the dry-milling step. The encapsulated mass is comminuted or pulverized and then wet-milled with a major amount of a low-boiling aliphatic hydrocarbon liquid. A suspension is then formed with additional hydrocarbon liquid. Additional charge director may be added, either during the wet-milling step or during the suspension-forming step. The suspension is then used as a bath from which the coating is deposited by electrophoresis. The magnetic particles are oriented by the application of a magnetic field, either during the depositing step or subsequent thereto. If subsequent, the binder is heated to soften the same. The final coating is then cured by any appropriate means, such as an electron beam.

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patent: 4310611 (1982-01-01), Miskinis
patent: 4311779 (1982-01-01), Miyakawa et al.
patent: 4543312 (1985-09-01), Murakawa et al.

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