Process for preparing aqueous dispersions of cathodic resins...

Details Process for preparing aqueous dispersions of cathodic resins... Process for preparing aqueous dispersions of cathodic resins...

C - Chemistry, Metallurgy

25

D

204/97.06

C25D 13/10 (2006.01)

Patent

CA 1153987

ABSTRACT OF THE DISCLOSURE 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 genera- ting such stable dispersion. The anionogen is proportioned to supply as the satisfying anionic moieties C1-4 fatty acid anions and H2PO4 - anions in a ratio of about 0.25:1 to 5:1. When such sites are from ionizable amino functionality, a mixture of car- boxylic 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 vari- ous 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 cor- rosion of containing and processing equipment.

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