# US 5,350,784 A · Water dispersible polyamine-epoxy adduct and epoxy coating composition

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- Number: US 5,350,784 A
- Document ID: US5350784A
- Status: Granted
- Kind: A
- Application number: 08/060,903
- Filed: 1993-05-13
- Granted: 1994-09-27
- Earliest claimed: 1992-06-03
- Assignees: Air Products and Chemicals, Inc.
- Inventors: Stuart P. Darwen; David A. Cornforth
- Web page: https://patentgrep.com/patent/US5350784A

## CPC

- C08G 59/184: {with amines}
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A two-component water-dispersible coating composition based on a blend of a water compatible polyamine-epoxy adduct and a resin compatible polyamine-epoxy adduct, and a polyepoxide resin. The water compatible polyamine-epoxy adduct is formed by reacting a polyamine having primary amine groups with a mixture of a monoepoxide and polyepoxide in which the amounts of monoepoxide and polyepoxide are such that the monoepoxide reacts with 10 to 50% of the primary amine groups and the polyepoxide reacts with 5 to 65% of the remaining primary amine groups. The resin compatible polyamine-epoxy adduct is formed by reacting a polyamine having primary amine groups with a monoepoxide or a polyepoxide in an amount which provides from about 0.4 to 1 equivalents epoxide per primary amine group. The amount of polyepoxide resin is such that there is from about 0.5 to 1.5 equivalents epoxide per active hydrogen equivalent.

## Claims

### Claim 1

A two component coating composition dispersed in an aqueous medium which comprises:
A. a blend comprising
(a) 0.25 to 4 weight parts of a water compatible polyamine-epoxy adduct formed by reacting a polyamine having primary amine groups with a mixture of a monoepoxide and polyepoxide wherein the monoepoxide is added in a proportion to react with from about 10 to 50% of the primary amine groups and the polyepoxide is added in an amount to react with from 5 to 65% of the remaining primary amine groups; and
(b) one weight part of a resin compatible polyamine,epoxy-adduct formed by reacting a polyamine having primary amine groups with a monoepoxide or a polyepoxide; said water compatible polyamine-epoxy adduct and said resin compatible polyamine-epoxy adduct blend having at least 25% of the remaining amine groups reacted with formaldehyde and the polyamine subsequently at least partially neutralized by reaction with an acid; and
B. a polyepoxide resin present in an amount such that there is from about 0.5 to 1.5 equivalents epoxide per amine active hydrogen in the blend.

### Claim 2 (depends on 1)

The composition of the claim 1 wherein the acid is a carboxylic acid.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the polyamine which reacts to form the water compatible polyamine-epoxy adduct is a polyalkylene polyamine having 3 to 6 amine nitrogen atoms.

### Claim 4 (depends on 3)

The composition of claim 3 wherein the polyamine is a polyethylene polyamine.

### Claim 5 (depends on 1)

The composition of claim 1 wherein an aliphatic diepoxide is a component of the polyepoxide which reacts with the polyamine to form the water compatible polyamine-epoxy adduct.

### Claim 6 (depends on 5)

The composition of claim 5 wherein the level of the aliphatic diepoxide is from about 0. 5 to 2 epoxide equivalents per epoxide equivalent of the polyepoxide.

### Claim 7 (depends on 1)

The composition of claim 1 wherein the polyamine which reacts to form the resin compatible polyamine-epoxy adduct is a polyethylene polyamine.

### Claim 8 (depends on 7)

The composition of claim 7 wherein the monoepoxide which reacts to form the resin compatible polyamine-epoxy adduct is an aromatic monoepoxide.

### Claim 9 (depends on 8)

The composition of claim 8 wherein the aromatic monoepoxide is phenyl glycidylether or cresol glycidylether.

### Claim 10 (depends on 9)

The composition of claim 9 wherein 40 to 100% of the available primary amine groups in the polyamine of the resin-compatible polyamine-epoxy adduct are reacted.