Claims
- 1. A method of electrodepositing a physically tough, corrosion resistant coating on the cathode of a unidirectional electrical system from an aqueous bath having a pH of 5.0-7.5 comprising passing a unidirectional electrical current through an aqueous bath comprising a water dispersible polymer which is a copolymer of:
- (A) an ethylenically unsaturated hydroxy functional amine adduct free of epoxy groups and containing from about 1.4 to about 2.0 ethylenically unsaturated amine groups per molecule, formed from a polyepoxide having a 1,2-epoxy equivalency of from about 1.4 to about 2.0 and at least a stoichiometric amount of an ethylenically unsaturated secondary amine having two ethylenically unsaturated groups; and
- (B) copolymerizable monoethylenically unsaturated monomers, a portion of which is amine-functional, said copolymer being dispersed in water with the aid of a solubilizing acid, said bath including an aminoplast or phenol-formaldehyde curing agent, and said electrical current depositing a coating of said polymer and said curing agent on the cathode, removing the coated cathode from the bath, and baking the same.
- 2. A method as recited in claim 1 in which said bath has a resin solids content of from 4-20% by weight.
- 3. A method as recited in claim 2 in which said bath has a pH in the range of 6.0-7.0.
- 4. A method as recited in claim 3 in which said copolymer is solubilized with acetic acid.
- 5. A method as recited in claim 1 in which said copolymer is formed by copolymerization in organic solvent solution and is present in admixture with from 10% to 150% of a water miscible organic solvent and said polyepoxide is a polyglycidyl ether of a bisphenol having a molecular weight of from about 700 to about 4000.
- 6. A method as recited in claim 1 in which said unsaturated secondary amine is derived from a drying or semi-drying fatty acid and constitutes from 5-75% of the polymer and said copolymer includes from 2-20% of said monoethylenically unsaturated amine-functional monomer.
- 7. A method as recited in claim 6 in which said amine functional monomer is a tertiary amine and said secondary amine is disoya amine.
Parent Case Info
This is a division of Ser. No. 860,908, filed Dec. 15, 1977, now U.S. Pat. No. 4,172,062.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4064090 |
Gibson et al. |
Dec 1977 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
860908 |
Dec 1977 |
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