# US 12,110,411 B2 · Powder coating composition

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- Number: US 12,110,411 B2
- Document ID: US12110411B2
- Status: Granted
- Kind: B2
- Application number: 17/422,533
- Filed: 2019-11-20
- Published: 2022-03-31
- Granted: 2024-10-08
- Earliest claimed: 2019-01-28
- Assignees: Kcc Corporation
- Applicants: Kcc Corporation
- Inventors: Jae Jun Lee; Hyeon Ung Wang; Jin Seok Lee
- Web page: https://patentgrep.com/patent/US12110411B2

## CPC

- C08G 59/4021: {Ureas; Thioureas; Guanidines; Dicyandiamides}
- C09D 163/00: Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C08G 59/245: {aromatic}
- C08G 59/686: {containing nitrogen}
- C09D 5/03: Powdery paints
- C09D 5/033: {characterised by the additives}
- C09D 7/61: inorganic
- C09D 7/63: organic
- C09D 7/69: {Particle size larger than 1000 nm}
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 3/04: Carbon
- C08K 3/22: of metals
- C08K 3/30: Sulfur-, selenium- or tellurium-containing compounds
- C08K 5/3445: Five-membered rings
- C08K 2003/2241: {Titanium dioxide}
- C08K 2003/3045: {Sulfates}
- C08K 2201/014: Additives containing two or more different additives of the same subgroup in C08K
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- 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

The present invention relates to a powder coating composition comprising an epoxy resin, a curing agent, a pigment, and a catalyst, wherein the pigment comprises an extender pigment having an average particle size of 1.0 μm to 8.0 μm, and the catalyst comprises an aliphatic imidazole compound and an aromatic imidazole compound.

## Claims

### Claim 1

A powder coating composition comprising an epoxy resin, a curing agent, a pigment, and a catalyst,
wherein the pigment comprises an extender pigment having an average particle size of 1.0 μm to 8.0 μm, and
the catalyst comprises an aliphatic imidazole compound and an aromatic imidazole compound, and a mixing ratio of the aliphatic imidazole compound to the aromatic imidazole compound is from 0.1:1 to 3:1 by weight.

### Claim 2 (depends on 1)

The powder coating composition of claim 1, wherein the curing agent is an amine-based curing agent having an amine value of 15 mgKOH/g to 30 mgKOH/g and an active hydrogen equivalent weight of 10 g/eq to 50 g/eq.

### Claim 3 (depends on 1)

The powder coating composition of claim 1, wherein the extender pigment comprises at least one selected from the group consisting of calcium carbonate, clay, talc, magnesium silicate, kaolin, mica, silica, aluminum silicate, aluminum hydroxide, and barium sulfate.

### Claim 4 (depends on 1)

The powder coating composition of claim 1, comprising 45 wt % to 80 wt % of the epoxy resin, 0.1 wt % to 10 wt % of the curing agent, 15 wt % to 50 wt % of the pigment, and 0.01 wt % to 10 wt % of the catalyst, with respect to a total weight of the powder coating composition.