Electrodeposition of aqueous dispersions of amine functional urethane copolymers

Claim 2

An amine functional urethane copolymer dispersible in water with the aid of a solubilizing acid and which is a copolymer of: A. 5-75% by weight of an ethylenically unsaturated urethane amine free of epoxy groups and formed by reacting a 1,2-epoxy functional urethane in which the urethane groups are ethylenically unsaturated with a monosecondary amine; and B. the balance consisting essentially of copolymerizable monoethylenically unsaturated monomers.

Claim 3

A water dispersible copolymer as recited in claim 1 in which said epoxy functional urethane is the urethane reaction product of an hydroxy functional 1,2-polyepoxide with an ethylenically unsaturated monoisocyanate which is the urethane reaction product of 1.8-2.4 isocyanate equivalents of organic diisocyanate with one equivalent of ethylenically unsaturated alcohol.

Claim 4

A water dispersible copolymer as recited in claim 2 in which said ethylenically unsaturated alcohol is a fatty alcohol.

Claim 5

A water dispersible copolymer as recited in claim 3 in which said fatty alcohol is selected from oleyl, linoleyl and linolenyl alcohols.

Claim 6

A water dispersible copolymer as recited in claim 2 in which said hydroxy functional polyepoxide is a diepoxide having a 1,2-epoxy equivalency of from about 1.2 to about 2.0.

Claim 7

A water dispersible copolymer as recited in claim 5 in which said diepoxide is a diglycidyl ether of a bisphenol having a 1,2-epoxy equivalency of from 1.4 to 2.0, and a molecular weight of from about 400 to about 4000.

Claim 8

A water dispersible copolymer as recited in claim 2 in which said reaction product of hydroxy functional polyepoxide with ethylenically unsaturated isocyanate terminated urethane consumes from 10% to 100% of the hydroxy groups in the diepoxide.

Claim 9

A water dispersible copolymer as recited in claim 7 in which at least about 0.9 mol up to about 2.0 mol of unsaturated urethane is used per mol of polyepoxide.

Claim 10

A water dispersible copolymer as recited in claim 1 in which said monosecondary amine is an hydroxy amine.

Claim 11

A water dispersible copolymer as recited in claim 1 in which said monosecondary amine provides at least one tertiary amine group per molecule of the amine-epoxide reaction product formed therefrom.

Claim 12

A water dispersible copolymer as recited in claim 5 in which said monosecondary amine is used to consume all of the epoxide groups in said diepoxide.

Claim 13

A water dispersible copolymer as recited in claim 1 in which said unsaturated urethane amine component (A) constitutes from 20%-60% of the copolymer.

Claim 14

A water dispersible copolymer as recited in claim 1 in which said monoethylenically unsaturated monomers include from 2-20% by weight of the copolymer of monoethylenically unsaturated amine.

Claim 15

A water dispersible copolymer as recited in claim 13 in which said unsaturated amine is a tertiary amine.

Claim 16

A water dispersible copolymer as recited in claim 14 in which said unsaturated amine is dimethyl aminopropyl methacrylamide.

Claim 17

A water dispersible copolymer as recited in claim 1 in which said unsaturated urethane amine component (A) constitutes from 20%-60% of the copolymer, and the balance of the copolymer consists essentially of copolymerized monoethylenically unsaturated monomers including from 6-15% of the copolymer of tertiary amine and at least 50% of said monomers being styrene.

Claim 18

A water dispersible copolymer as recited in claim 1 in which said monomers include water soluble monomers providing amide, hydroxy, or N-methylol functionality in a total amount of from 5-30% of the copolymer.

Claim 19

An amine functional urethane copolymer dispersible in water with the aid of a solubilizing acid and which is a copolymer of: A. 20-60% by weight of an ethylenically unsaturated urethane amine free of epoxy groups and formed by reacting a monosecondary amine with a polyepoxide reaction product of an hydroxy functional polyepoxide which is a diglycidyl ether of a bisphenol having a 1,2-epoxy equivalency of from 1.4 to 2.0, and a molecular weight of from about 400 to about 4000, with an ethylenically unsaturated isocyanate terminated urethane, said ethylenically unsaturated isocyanate terminated urethane being the reaction product of from 1.8-2.4 isocyanate equivalents of organic diisocyanate with one equivalent of ethylenically unsaturated fatty alcohol, there being at least about 0.9 mol up to about 2.0 mol of unsaturated urethane per mol of polyepoxide; and B. the balance consisting essentially of copolymerizable monoethylenically unsaturated monomers including from 2-20% by weight of the copolymer of monoethylenically unsaturated tertiary amine.

Claim 20

An amine functional urethane copolymer dispersible in water with the aid of a solubilizing acid and which is a copolymer of: A. 20-60% by weight of an ethylenically unsaturated urethane amine free of epoxy groups and formed by reacting a monosecondary amine with a polyepoxide reaction product of an hydroxy functional polyepoxide which is a diglycidyl ether of a bisphenol having a 1,2-epoxy equivalency of from 1.4 to 2.0, and a molecular weight of from about 400 to about 4000, with an ethylenically unsaturated isocyanate terminated urethane, said ethylenically unsaturated isocyanate terminated urethane being the reaction product of from 1.8-2.4 isocyanate equivalents of organic diisocyanate with one equivalent of ethylenically unsaturated fatty alcohol, there being at least about 0.9 mol up to about 2.0 mol of unsaturated urethane per mol of polyepoxide; and B. the balance consisting essentially of copolymerizable monoethylenically unsaturated monomers including from 2-20% by weight of the copolymer of monoethylenically unsaturated tertiary amine.

Claim 21

A water dispersion of the copolymer defined in claim 1 dispersed in water with the aid of a solubilizing acid, said dispersion having a pH in the range of 5.0-7.5.

Claim 22

A water dispersion as recited in claim 19 in which said water dispersion further includes an aminoplast or phenol-formaldehyde curing agent.

Claim 23

An aqueous electrocoat bath comprising the water dispersion of claim 20 having a resin solids content of from 4-20% by weight.

Claim 24

An aqueous electrocoat bath as recited in claim 21 in which said bath has a pH in the range of 5.5-7.0.

Claim 25

An aqueous electrocoat bath as recited in claim 22 in which said copolymer is solubilized with acetic acid.