# US 5,705,548 A · Polyester powder coating composition

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- Number: US 5,705,548 A
- Document ID: US5705548A
- Status: Granted
- Kind: A
- Application number: 08/771,934
- Filed: 1996-12-23
- Granted: 1998-01-06
- Earliest claimed: 1995-12-25
- Assignees: Sumitomo Chemical Company, Limited
- Inventors: Yoshiki Matsuoka; Toshiaki Hayashi; Hiroshi Nakamura
- Web page: https://patentgrep.com/patent/US5705548A

## CPC

- C09D 179/04: Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08K 5/315: Compounds containing carbon-to-nitrogen triple bonds
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A powder coating composition comprising as essential components: (A) polyester resin having at least two hydroxyl groups in a molecule, and (B) polyvalent organic cyanate having at least two cyanate groups in a molecule of the following formula and/or its prepolymer; ##STR1## wherein A is C1-C6 hydrocarbon group, and A may be different from each other; X is a single bond, C1-C20 hydrocarbon group, carbonyl group, sulfone group, divalent sulfur atom or oxygen atom; i is an integer of 0 to 3, which may be different from each other; and n is 0 or 1. The powder coating compound gives improved environmental sanitation in curing and high surface smoothness and high corrosion resistance of the coated product.

## Claims

### Claim 1

A powder coating composition comprising as essential components: (A) polyester resin having at least two hydroxyl groups in a molecule, and (B) polyvalent organic cyanate having at least two cyanate groups in a molecule of the following formula and/or its prepolymer as essential components; ##STR3## wherein A is C1-C6 hydrocarbon group, and A may be different from each other;
X is a single bond, C1-C20 hydrocarbon group, carbonyl group, sulfone group, divalent sulfur atom or oxygen atom;
i is an integer of 0 to 3, which may be different from each other; and
n is 0 or 1.

### Claim 2 (depends on 1)

The powder coating composition according to claim 1, wherein the hydrocarbon group (A) in the polyvalent organic cyanate is in an ortho position to the cyanate group.

### Claim 3 (depends on 1)

The powder coating composition according to claim 1, wherein the hydroxyl value of the polyester resin is in the range of 20 mgKOH/g to 60 mgKOH/g, the number average molecular weight is in the range of 2000 to 50000, and the glass transition temperature is in the range of 40.degree. C. to 100.degree. C.

### Claim 4 (depends on 1, 2)

The powder coating composition according to claim 1 or 2, wherein the polyvalent organic cyanate is 1,1-bis(3-t-butyl-4-cyanate-6-methylphenyl)butane.

### Claim 5 (depends on 1, 2)

The powder coating composition according to claim 1 or 2, which further contains (C) a catalyst to accelerate the curing reaction.

### Claim 6 (depends on 1, 2)

The powder coating composition according to claim 1 or 2, further containing a catalyst (C), wherein the catalyst (C) is a tin-based organometal compound.

### Claim 7 (depends on 1, 2)

A coated product made by coating the powder coating composition of claim 1 or 2.