Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1985-03-11
1986-04-29
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041814, 252 6253, 252 6254, C25D 1302, C25D 1500
Patent
active
045855358
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 binder 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.
REFERENCES:
patent: 3846356 (1974-11-01), Hou et al.
patent: 4039697 (1977-08-01), Isawa et al.
Sabo Karen
Sher Arden
Savin Corporation
Williams Howard S.
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