Electrodeposition coating method

Details Electrodeposition coating method Electrodeposition coating method

1988-08-08

1989-06-20

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041817, C25D 1306

Patent

active

048407151

ABSTRACT:
A method of electrodeposition coating, which comprises performing a first electrodeposition coating on an article as a cathode using (I) a cationic electrodeposition paint comprising (A) a resin and (B) at least one pigment, said pigment (B) containing at least 5% by weight of a pigment having an oil absorption of at least 100 and being incorporated so that the total oil absorption of the pigment (B) is in the range of 1,000 to 10,000 per 100 g of the resin (A), then while the resulting coated film is in the uncured state, performing a second electrodeposition coating on it using (II) an emulsion-type cationic electrodeposition coating paint comprising a resin (C) and a pigment (D) and having a minimum electrodeposition current density of not more than 0.7 mA/cm.sup.2 and a degree of emulsification of at least 80% by weight, said pigment (D) having a lower total oil absorption than the total oil absorption of the pigment (B) in the cationic electrodeposition paint (I), and thereafter curing the applied films under heat to form a composite cured coated film.

REFERENCES:
patent: 3408278 (1968-10-01), Stoodley
patent: 3846356 (1974-11-01), Hou et al.
patent: 4624762 (1986-11-01), Abbey et al.

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