Ppg Industries, Inc.

Gerald R Gacesa

William A Essary

Myron J Krupp

John P Knudtson

In an apparatus and method for electrocoating containers such as metal cans, continuity of liquid coating material with the inverted interiors of the containers is improved by partially blocking the flow of liquid from the containers by baffle means.

Nozzle arrangement for electrocoating container interiors

A method for coating an electroconductive article such as a continuous length of flat metal sheet is disclosed. The method of the invention involves passing the electroconductive article into an aqueous electrodeposition bath which contains as the electrocoating vehicle a water-soluble resinous coating material in combination with a water-insoluble emulsified resinous material. The vehicle is electrodeposited on said metal sheet to form a primer coating as the electroconductive article passes through the electrodeposition bath. A top coat is applied to said primer without having previously baked the primer, and the topcoated metal is then passed to a baking station where the top coat and primer coat are baked simultaneously. The combination of solubilized and emulsified resinous materials offers a number of processing advantages. For example, the electrodeposition bath can be operated at higher temperatures than are normally associated with electrodeposition and since only one baking station is needed, equipment and fuel costs are minimized.

Method of electrocoating

This invention relates to novel stain-resistant electrodepositable compositions. It has been found that electrodepositable resins, and especially those resins which are mixed fatty acid partial esters of high molecular weight polyols have a tendency to develop a stain when electrodeposited over an iron-containing substrate. This staining problem is eliminated or greatly reduced by use of a complex organic polyphosphoric ester acid anhydride.

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Baden, PA, United States of America

Gerald R Gacesa