# US 12,180,604 B2 · Method for coating a substrate

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- Number: US 12,180,604 B2
- Document ID: US12180604B2
- Status: Granted
- Kind: B2
- Application number: 17/746,662
- Filed: 2022-05-17
- Published: 2023-05-25
- Granted: 2024-12-31
- Earliest claimed: 2021-11-19
- Assignees: Giant Glory International Limited
- Applicants: Giant Glory International Limited
- Inventors: Shun-Jie Yang; Hsiang-Jui Wang; Cheng-Ping Hsiao
- Web page: https://patentgrep.com/patent/US12180604B2

## CPC

- C25D 13/04: with organic material
- B05D 7/16: using synthetic lacquers or varnishes
- C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)}
- C09D 5/44: for electrophoretic applications (processes for coating by electrophoresis C25D13/00)
- C09D 5/4411: {Homopolymers or copolymers of acrylates or methacrylates}
- C09D 5/4457: {containing special additives, e.g. pigments, polymeric particles}
- C09D 5/448: {characterised by the additives used (C09D5/4403 - C09D5/4476, C09D5/4492 take precedence)}
- C09D 7/41: Organic pigments; Organic dyes
- C09D 7/61: inorganic
- C25D 13/20: Pretreatment
- C25D 13/22: Servicing or operating {apparatus or multistep processes}
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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)

## Abstract

A method for coating a substrate includes the steps of: forming a conductive coating layer on a surface of a substrate so as to form a semi-product; submerging a conductive sheet and the semi-product into an electrophoresis medium that includes charged colloid particles; and applying a voltage on the conductive sheet or the semi-product to form an electric field among the conductive sheet, the semi-product, and the electrophoresis medium, so that the colloid particles move along the electric field toward the semi-product and an electrophoretic covering layer formed by the charged colloid particles is thus deposited on the electrophoretic covering layer.

## Claims

### Claim 1

A method for coating a substrate, comprising the steps of:
forming a conductive coating layer on at least a part of a surface of the substrate so as to form a semi-product, the conductive coating layer being made of a conductive lacquer and having a surface resistance no greater than 500 Ω·m;
submerging a conductive sheet and the semi-product into an electrophoresis medium that includes charged colloid particles, the conductive sheet and the semi-product functioning as electrodes; and
applying a voltage ranging between 60V and 120V on one of the conductive sheet and the semi-product to form an electrical field among the conductive sheet, the semi-product and the electrophoresis medium, so that a part of the charged colloid particles move along a direction of the electric field toward the semi-product and an electrophoretic covering layer formed by the charged colloid particles is thus deposited on the conductive coating layer, the electrophoretic covering layer having a thickness no greater than 30 μm.

### Claim 2 (depends on 1)

The method according to claim 1, wherein a total thickness of the conductive coating layer and the electrophoretic covering layer is no greater than 50 μm.

### Claim 3 (depends on 1)

The method according to claim 1, wherein
the conductive lacquer includes a base material and a conductive material,
the base material is one of an epoxy resin and an acrylic resin, and
the conductive material is one of modified titanium oxide, metal, carbon-nanotube, graphite, and graphene.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the conductive lacquer further includes a colorant that is one of an inorganic pigment and an organic dye.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the substrate is made of a material which is one of magnesium, aluminum, magnesium alloy, aluminum alloy, and magnesium-aluminum alloy.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the charged colloid particles of the electrophoresis medium is a waterborne resin.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the voltage ranges from 80 v to 120 v.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the voltage ranges from 80 v to 100 v.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the step of forming the conductive coating layer on at least the part of the surface of the substrate is conducted by coating technique.