Abstract A cross-linkable coating composition derived from an unsaturated compound containing a carboxylic acid group, an epoxidized material and a compound which contains a pendant amine group is dispersed in water by means of an acid such as phosphoric acid. The composition may be a blend of an epoxidized material with a copolymer having free carboxylic acid and amine groups, or a partially reacted precondensate thereof, or a condensate of a drying oil carboxylic acid, an epoxidized material and an amino acid. An article immersed in the dispersion as cathode is coated by electrodeposition and thereafter the coating cross linked by heating. The dispersion is replenished by a concentrate of coating composition.
A process according to claim 1 wherein alkylaminoalkyl monoalkenoate is a dialkylaminoethyl methacrylate.
Claim 2
Dependent Claim
19 words
A process according to claim 1 wherein the epoxidized material is a condensation product of epichlorhydrin and 2:2-di-p-hydroxyphenol propane.
Claim 3
Dependent Claim
16 words
A process according to claim 1 wherein the copolymer and the epoxidized material are partially interacted.
Claim 4
Dependent Claim
13 words
A process according to claim 1 wherein the epoxidized material is epoxidized polybutadiene.
Claim 5
Dependent Claim
13 words
A process according to claim 1 wherein the proton-donating acid is phosphoric acid.
Claim 6
Dependent Claim
20 words
A process according to claim 1 wherein the coating composition is dissolved in organic soLvent prior to dispersion in water.
Claim 7
Dependent Claim
19 words
A process according to claim 1 wherein the article is cured at a temperature in the range 100*-150* C.
Claim 8
Dependent Claim
18 words
A process according to claim 1 wherein the electric current has a voltage in the range 12-300 volts.
Claim 9
Dependent Claim
88 words
A process of coating an electrically conductive article by electrodeposition which comprises immersing the article in an aqueous coating composition and passing an electric current through the composition between the article as cathode and another electrode in electrical contact with the composition, characterized in that the composition comprises a member of the group consisting of (A) a blend of (1) a copolymer of an alkenoic monocarboxylic acid and an alkylaminoalkyl monoalkenoate or vinyl pyridine, (2) an epoxidized material selected from the group consisting of compounds having the formula: