Verfahren und Mittel zur Herstellung eines Belages auf einem Gegenstand mittels elektrischen Stromes

1303480 Electro-phoretic coating M & T CHEMICALS Inc 3 Nov 1970 [24 Nov 1969] 52206/70 Heading C7B [Also in Division C3] An electrocoated article is prepared by maintaining a liquid bath composition having dispersed therein (a) particles of an amine-containing polymeric organic coating material having a positive charge and (b) a blocked multi-functional isocyanate, maintaining a first electrode in intimate electrical contact with the bath as anode, immersing in the bath an electrically conductive article at least a portion of which bears a negative charge as cathode, passing an electric current through the electrodes and the bath thereby electrocoating the cathode, and heating the electrocoated article after removal from the bath to form a water-resistant cross-linked polymerized electrocoated surface on the article. The polymeric material may be a polyaddition or polycondensation product, and the amine groups may be present in the polymer, or a fatty ammonium salt or fatty amine may be added to a non-amine containing polymer as emulsifier. The bath may also contain a heat-curable resinous material having a molecular weight of 300-20, 000 in amounts of up to 50% by weight based on the weight of (a) and (b) above. The heat-curable resinous material may be a polyepoxide, polysulphide or a formaldehyde condensate of a phenol, urea or melamine. The bath may also contain a pigment, such as red iron oxide, titanium dioxide or carbon black.