# US 5,705,557 A · One-component aqueous coating systems containing a reactive additive component

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- Number: US 5,705,557 A
- Document ID: US5705557A
- Status: Granted
- Kind: A
- Application number: 08/568,816
- Filed: 1995-12-07
- Granted: 1998-01-06
- Earliest claimed: 1994-07-09
- Assignees: Huels Aktiengesellschaft
- Inventors: Hartwig Lange; Martina Ortelt
- Web page: https://patentgrep.com/patent/US5705557A

## CPC

- C09D 175/04: Polyurethanes
- C08G 18/0823: {containing carboxylate salt groups or groups forming them}
- C08G 18/4018: {Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48}
- C08G 18/4063: {Mixtures of compounds of group C08G18/62 with other macromolecular compounds}
- C08G 18/4263: {containing carboxylic acid groups}
- C08G 18/792: {formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates}
- C08G 18/8077: {Oximes}
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A one-component aqueous coating system comprising (A) a hydrophilic polyacrylate polyol or polyesterpolyol containing at least one hydroxyl group, (B) a polyisocyanate which is water resistant at room temperature or a blocked polyisocyanate, (C) optionally a pigment or a conventional paint auxiliary, such as an antifoam, a levelling agent, a catalyst or a thixotropic agent, and a further reactive additive component (D), in a quantity of from 2 to 20% by weight, based on the overall solids content of (A), (B) and (D), the additive component (D) being characterized in that it contains at least one reactive OH, NH, NH.sub.2 or SH group and has a functionality of at least 1.5 to 3.0 relative to the crosslinking agent (B), a solubility in water of below 2% by weight and a molecular weight of 500-2000 g/mol.

## Claims

### Claim 1

A one-component aqueous coating system, consisting essentially of:
(A) a hydrophilic polyurethane containing at least one hydroxyl group,
(B) a melamine resin,
(C) optionally a pigment of a conventional paint auxiliary,
(D) a reactive additive component in an amount of from 2 to 20% by weight, based on the overall solids content of (A), (B) and (D), said additive component (D) being a polyether polyol which is reactive to component (B), said component (D) having a solubility in water of below 2% by weight and a molecular weight of 500-2000 g/mol; and
water.

### Claim 2 (depends on 1)

The coating system of claim 1, wherein said reactive additive polyether polyol (D) is polytetramethylene glycol.

### Claim 3 (depends on 1)

The coating system of claim 1, wherein said aqueous system is present as a suspension, dispersion, emulsion or solution.

### Claim 4 (depends on 1)

The coating system of claim 1, wherein said auxiliary is an antifoam, a leveling agent, a catalyst or a thixotropic agent.

### Claim 5

A process for the preparation of a one-component aqueous coating system consisting essentially of:
(A) a hydrophilic polyurethane containing at least one hydroxyl group,
(B) a melamine resin,
(C) optionally, a pigment or a conventional paint auxiliary,
wherein a mixture is obtained by mixing said components (A) to (C) and a further reactive additive component (D) which is a polyether polyol, said polyether polyol being present in a quantity of from 2 to 20% by weight, based on the overall solids content of said (A), (B) and (D), having a solubility in water of below 2% by weight and a molecular weight of 500-2000 g/mol,
and wherein said mixture is subsequently converted into an aqueous system.

### Claim 6 (depends on 5)

The process of claim 5, wherein (A), (B), optionally (C) and (D) are mixed in an organic solvent.

### Claim 7 (depends on 5)

The process of claim 5, wherein said auxiliary is an antifoam, a leveling agent, a catalyst or a thixotropic agent.

### Claim 8 (depends on 5)

The process of claim 5, wherein said reactive additive polyether polyol (D) is polytetramethylene glycol.