Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1976-11-26
1978-09-12
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
C25D 1306, C25D 1310
Patent
active
041135970
ABSTRACT:
A simplified method for the cathodic electrodeposition of polyamine resin from a dispersion thereof in an aqueous electrocoating bath is provided in which the polyamine is selected to be stably dispersible in water in the form of a salt with a solubilizing acid at a pH of from 6.0-7.5, and this polyamine resin is substantially completely neutralized with carbonic acid and dispersed in water in the form of an amine carbonate or bicarbonate. A unidirectional electrical current is passed through an aqueous electrocoating bath containing the amine carbonate or bicarbonate to deposit the polyamine resin at the cathode and cause the release of carbon dioxide. In preferred practice, a proportion of the amine groups in the polyamine resin within the bath, low enough to maintain the pH of the bath at a pH of about 6.0 or higher, is reacted with a relatively nonvolatile solubilizing acid, and the polyamine resin solids in the electrocoating bath are replenished by adding to bath polyamine resin substantially completely neutralized with carbonic acid.
REFERENCES:
patent: 3939051 (1976-02-01), Anderson et al.
Basoms John A.
Murphy Edward J.
Rabi Rafat T.
DeSoto, Inc.
Williams Howard S.
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