Process and bath composition for increasing the rate of polymer deposition in electrocoating

Abstract

Abstract There is provided an electrocoating bath composition for depositing a coat of polymer material onto an anode. This bath composition comprises an essentially aqueous solution, emulsion or dispersion of the polymer and 0.01 by 2.0% by weight with reference to the bath composition of a compound of one of the general formulae: X -- R -- X' or R' -- X -- R -- X' wherein R and R' are each an organic radical, X is one of the following groups: -SH, -OH (phenolic or enolic), ═NH, -- NH.H, and X' is a hydrogen atom or X, the groups X being in such electronic configuration with reference to the organic radical R or the organic radicals R and R' that there is always a presence of labile protons therein under operative conditions of the electrocoating bath, or of a salt of said compound, and the compound or its salt being in an at least partially disassociated state in the electrocoating bath composition and capable of proton association in close vicinity of the anode under conditions of operation. When the electrocoating process is carried out in such bath, be it batchwise or continuously, an increased rate of polymer deposition onto the anode is achieved.

Inventors

• 👤 Michael A. Dudley

Bibliographic Details