# US 5,705,558 A · Water-based reflow coating composition

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- Number: US 5,705,558 A
- Document ID: US5705558A
- Status: Granted
- Kind: A
- Application number: 08/114,736
- Filed: 1993-08-30
- Granted: 1998-01-06
- Earliest claimed: 1993-08-30
- Assignees: C.P. Company S.p.A.
- Inventors: James N. Krouse
- Web page: https://patentgrep.com/patent/US5705558A

## CPC

- C09D 133/062: {Copolymers with monomers not covered by C09D133/06}
- C08L 61/20: Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen (with aminophenols C08L61/04)
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Water-reducible coating formulations suitable for use in thermal reflow coating protocols are described. The water-based coating formulations comprise an aqueous dispersion of a resin solids composition. The resin solids comprise about 70 to about 99% by weight of an acrylic resin having a glass transition temperature less than 150.degree. F. and an effective amount of a reflow modifier selected from a thermoplastic resin having a glass transition temperature greater than 150.degree. F. or less than 80% of the stoichiometric amount of a cross-linking agent for the acrylic resin. The improved water-based formulations in accordance with the invention provide high gloss, thermally reflowable coatings without the high organic volatiles content of art-recognized thermal reflow coating systems.

## Claims

### Claim 1

A water-based coating composition comprising a dispersion of a resin solids composition in water, said resin solids composition comprising
(1) about 70 to about 99% by weight of an acrylic resin having a glass transition temperature of about 68.degree. to about 150.degree. F. said acrylic resin selected from carboxy-functional, hydroxy-functional and epoxy-functional acrylic resins and,
(2) a reflow modifier selected from the group consisting of (a) and (b), wherein (a) is about 10 to about 30% by weight of a thermoplastic resin having a glass transition temperature of about 150.degree. F. to about 250.degree. F., and (b) is about 0.1 to about 12% by weight of a cross-linking agent for the acrylic resin wherein the cross-linking agent is melamine or a melamine formaldehyde condensation resin, provided that the amount of cross-linking agent is not more than 80% of the stoichiometric amount calculated based on the amount of acrylic resin,
said coating composition further characterized by its capacity to provide a thermally reflowable high gloss coating having acceptable print resistance within a temperature range of about 140.degree. to about 180.degree. F.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the reflow modifier is a cross-linking agent employed in an amount not more than 50% of the stoichiometric amount calculated based on the amount of the acrylic resin.