Process for electrocoating aqueous dispersions of cathodic resin

Details Process for electrocoating aqueous dispersions of cathodic resin Process for electrocoating aqueous dispersions of cathodic resin

1978-08-21

1980-08-19

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25D 1306, C25D 1310

Patent

active

042182964

ABSTRACT:
Cathodically electrodepositable resin having sufficient cationogenic sites to form, when enough of such sites are ionized, a stable aqueous dispersion, is dispersed in water with anionogen satisfying at least the requisite number of such sites for generating such stable dispersion. The anionogen is proportioned to supply as the satisfying anionic moieties C.sub.1-4 fatty acid anions and H.sub.2 PO.sub.4 --anions in a ratio of about 0.25:1 to 5:1. When such sites are from ionizable amino functionality, a mixture of carboxylic acid (preferably acetic) and orthophosphoric acid is the anionogen, and such acids are proportioned so that their primary acid hydrogens are not substantially in excess of all the ionizable base functionality present. The dispersion can be used for various coating purposes, but is particularly notable for its use in cathodic electrocoating of iron and steel cathodic substrates using iron and steel equipment without appreciable staining and discoloration of the applied coating, while also suppressing corrosion of containing and processing equipment.

REFERENCES:
patent: 3682814 (1972-08-01), Gilchrist
patent: 3869366 (1975-03-01), Suzula
patent: 4076676 (1978-02-01), Sommerfeld

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