Method of electrodepositing primary amine group-containing cationic resins
AssigneePPG Industries, Inc.
InventorsRobert D. Jerabek, Joseph R. Marchetti, Robert R. Zwack
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Abstract
The pH, dispersibility and throw power of amine group-solubilized, epoxy resin-derived, cationic electrodepositable resins can be enhanced by the incorporation of primary amine groups into the resin molecule. The primary amine groups are incorporated by reacting certain polyamine compounds in which the primary amine groups are blocked by ketimine groups into the acid solubilizable, amine group-containing electrodepositable resins derived from epoxy group-containing resins.
Claims7
In a method of electrocoating an electrically conductive surface serving as a cathode, which method comprises passing electrical current between said cathode and an anode in contact with an aqueous electrodepositable composition,
- the improvement wherein said electrodepositable composition comprises an acid-neutralized, amine group-solubilized synthetic organic resin, wherein said organic resin contains hydroxyl groups curable through urethane group crosslinking, wherein at least a portion of said amine groups are primary amine groups and wherein said organic resin is formed from a compound containing epoxy functionality, at least a portion of said epoxy functionality having been reacted with a polyamine, said polyamine having latent primary amine groups blocked by ketimine groups and having at least one secondary amine group.
Dependencies are inferred from the claim text.