# US 5,705,595 A · Aqueous intercoat composition

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- Number: US 5,705,595 A
- Document ID: US5705595A
- Status: Granted
- Kind: A
- Application number: 08/595,788
- Filed: 1996-02-02
- Granted: 1998-01-06
- Earliest claimed: 1995-02-07
- Assignees: Kansai Paint Co., Ltd.
- Inventors: Hiroaki Oda; Mikio Shimakawa; Hisashi Isaka; Naoji Matsumoto
- Web page: https://patentgrep.com/patent/US5705595A

## CPC

- C09D 175/06: from polyesters
- C08G 18/302: {Water}
- C08G 18/4263: {containing carboxylic acid groups}
- C08G 18/4286: {prepared from a combination of hydroxycarboxylic acids and/or lactones with polycarboxylic acids or ester forming derivatives thereof and polyhydroxy compounds}
- C09D 167/00: Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers
- 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

This invention provides an aqueous intercoat composition comprising, as main components, (A) a polyester resin having a hydroxyl group and a carboxyl group in one molecule, (B) a blocked product of at least one polyisocyanate selected from a polymer of aliphatic polyisocyanate, an adduct of said polymer with an active hydrogen-containing compound and an adduct of aliphatic polyisocyanate with an active hydrogen-containing compound, and (C) water. The aqueous intercoat composition of the invention is capable of forming a coating film excellent in chipping resistance.

## Claims

### Claim 1

An aqueous intercoat composition comprising, as main components, (A) a polyester resin having a weight average molecular weight of about 10,000 to about 20,000 and containing a hydroxyl group and a carboxyl group in one molecule, (B) a blocked product of at least one polyisocyanate selected from the group consisting of dimers to pentamers of aliphatic polyisocyanate, an adduct of said dimers to pentamers with an active hydrogen-containing compound and an adduct of aliphatic polyisocyanate with an active hydrogen-containing compound, and (C) water.

### Claim 2 (depends on 1)

The aqueous intercoat composition according to claim 1 wherein the polyester resin (A) is at least one species selected from the group consisting of polyester resins prepared by reacting a hydroxyl- and carboxyl-containing polyester resin with a lactone and polyester resins prepared by subjecting a polyester resin having at least two hydroxyl groups in one molecule and an acid anhydride to half-esterification reaction.

### Claim 3 (depends on 1)

The aqueous intercoat composition according to claim 1 wherein the polyester resin (A) has a hydroxyl value of about 50 to about 200 mg KOH/g, and an acid value of about 10 to about 50 mg KOH/g.

### Claim 4 (depends on 3)

The aqueous intercoat composition according to claim 3 wherein the polyester resin (A) has a hydroxyl value of about 80 to about 150 mg KOH/g, and an acid value of about 20 to about 40 mg KOH/g.

### Claim 5 (depends on 1)

The aqueous intercoat composition according to claim 1 wherein components (A) and (B) are present in proportions such that a composition containing only components (A) and (B) in such proportions gives upon curing a film coating having a glass transition temperature of 0.degree. to 70.degree. C.

### Claim 6 (depends on 5)

The aqueous intercoat composition according to claim 5 wherein components (A) and (B) are present in proportions such that a composition containing only components (A) and (B) in such proportions gives upon curing a film coating having a glass transition temperature of 30.degree. to 50.degree. C.

### Claim 7 (depends on 1)

The aqueous intercoat composition according to claim 1 wherein the proportions of the components (A) and (B) are in the range in which 0.5 to 1.5 moles of the blocked isocyanate group of the component (B) is present per mole of the hydroxyl group of the component (A).

### Claim 8 (depends on 7)

The aqueous intercoat composition according to claim 7 wherein the proportions of the components (A) and (B) are in the range in which 0.8 to 1.2 moles of the blocked isocyanate group of the component (B) is present per mole of the hydroxyl group of the component (A).