# US 2019/0168255 A1 · Method for forming multilayer coating film

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- Number: US 2019/0168255 A1
- Document ID: US20190168255A1
- Status: Published application
- Kind: A1
- Application number: 16/314,917
- Filed: 2017-04-11
- Published: 2019-06-06
- Earliest claimed: 2016-07-08
- Assignees: Kansai Paint Co., Ltd.
- Applicants: Kansai Paint Co., Ltd.
- Inventors: Hirohisa TSUDA; Toshiki TAKENAKA; Michihiro FUJITA; Hideaki KATSUTA
- Web page: https://patentgrep.com/patent/US20190168255A1

## CPC

- B05D 1/36: Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D 7/542: {the two layers being cured or baked together}
- C08G 18/4825: {Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence)}
- C08G 18/6229: {Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols}
- C08G 18/792: {formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates}
- C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes
- C09D 5/002: {Priming paints (C09D5/08 takes precedence)}
- C09D 5/08: Anti-corrosive paints
- C09D 7/61: inorganic
- C09D 133/00: Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D 133/04: Homopolymers or copolymers of esters {(C09D143/04 takes precedence)}
- C09D 163/00: Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D 175/16: having terminal carbon-to-carbon unsaturated bonds
- E02F 9/00: Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00 (laying-out or take-up devices for trailing electric cables B66C)
- B05D 1/02: performed by spraying
- B05D 2202/00: Metallic substrate
- B05D 2503/00: Polyurethanes
- B05D 2504/00: Epoxy polymers
- B05D 2601/02: used for pigmentation effect, e.g. metallic effect
- C08K 2003/3045: {Sulfates}
- C09D 5/084: {Inorganic compounds}
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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)
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

An object achieved by the present invention is to provide a coated article having excellent appearance, corrosion resistance, weatherability, and chipping resistance obtained by a wet-on-wet coating. The present invention provides a method for forming a multilayer coating film comprising the steps of forming, on a substrate, an uncured coating film of a primer paint composition (A) containing an epoxy resin (a1) having a weight average molecular weight of 20000 or more and pigments, forming, on the uncured coating film, a top coating film of a top paint composition (B) containing an acrylic resin (b1) and the like, and simultaneously drying the films, wherein the uncured coating film of the primer paint composition (A) during application of the top paint composition (B) has a viscosity of 5 Pa·s to 1000 Pa·s, and the value ANV obtained by subtracting the value (NV1) of application mass solids content (%) of the primer paint composition (A) from the value (NV2) of mass solids content (%) of the uncured coating film of the primer paint composition (A) during the application of the top paint composition is 15 or more.

## Claims

### Claim 1

A method for forming a multilayer coating film comprising forming an uncured coating film of a primer paint composition (A) as defined below on a substrate, forming a top coating film of a top paint composition (B) as defined below on the uncured coating film, and simultaneously drying the films,
wherein the uncured coating film of the primer paint composition (A) during application of the top paint composition (B) has a viscosity of 5 Pa·s to 1000 Pa·s, and
a value ΔNV obtained by subtracting a value (NV1) of application mass solids content (%) of the primer paint composition (A) from a value (NV2) of mass solids content (%) of the uncured coating film of the primer paint composition (A) during application of the top paint composition (B) is 15 or more;
Primer Paint Composition (A):
A paint composition comprising an epoxy resin (a1) having a weight average molecular weight of 20000 or more, a rust preventive pigment (a2), a color pigment (a3), and an extender pigment (a4), the composition containing the rust preventive pigment (a2) in an amount of 1 to 70 parts by mass, the color pigment (a3) in an amount of 40 to 150 parts by mass, and the extender pigment (a4) in an amount of 40 to 150 parts by mass, per 100 parts by mass of the total solids content of the epoxy resin (a1);
Top Paint Composition (B):
A paint composition comprising an acrylic resin (b1), a polyisocyanate compound (b2), a silane coupling agent (b3), and barium sulfate (b4) having an average particle size of 0.01 to 5.0 μm, the composition containing the acrylic resin (b1) and the polyisocyanate compound (b2) in a proportion of 60 to 90 parts by mass to 10 to 40 parts by mass, and the barium sulfate (b4) in an amount of 1 to 50 parts by mass, per 100 parts by mass of the total solids content of the acrylic resin (b1) and the polyisocyanate compound (b2).

### Claim 2 (depends on 1)

The method according to claim 1, wherein the primer paint composition (A) further comprises a silane coupling agent (a5) in an amount of 0.1 to 10 parts by mass, per 100 parts by mass of the total solids content of the epoxy resin (a1).

### Claim 3 (depends on 1)

The method according to claim 1, wherein the primer paint composition (A) comprises talc as at least part of the extender pigment (a4) in an amount of 0.1 to 30 parts by mass, per 100 parts by mass of the total solids content of the epoxy resin (a1).

### Claim 4 (depends on 1)

The method according to claim 1, wherein the top paint composition (B) further comprises polyether polyol in an amount of 0.1 to 30 parts by mass, per 100 parts by mass of the total solids content of the acrylic resin (b1) and the polyisocyanate compound (b2).

### Claim 5 (depends on 1)

A method for producing construction machinery or industrial machinery having a multilayer coating film, the method comprising the step of forming a multilayer coating film by using the method according to claim 1.

### Claim 6 (depends on 2)

The method according to claim 2, wherein the primer paint composition (A) comprises talc as at least part of the extender pigment (a4) in an amount of 0.1 to 30 parts by mass, per 100 parts by mass of the total solids content of the epoxy resin (a1).

### Claim 7 (depends on 2)

The method according to claim 2, wherein the top paint composition (B) further comprises polyether polyol in an amount of 0.1 to 30 parts by mass, per 100 parts by mass of the total solids content of the acrylic resin (b1) and the polyisocyanate compound (b2).

### Claim 8 (depends on 3)

The method according to claim 3, wherein the top paint composition (B) further comprises polyether polyol in an amount of 0.1 to 30 parts by mass, per 100 parts by mass of the total solids content of the acrylic resin (b1) and the polyisocyanate compound (b2).

### Claim 9 (depends on 6)

The method according to claim 6, wherein the top paint composition (B) further comprises polyether polyol in an amount of 0.1 to 30 parts by mass, per 100 parts by mass of the total solids content of the acrylic resin (b1) and the polyisocyanate compound (b2).

### Claim 10 (depends on 2)

A method for producing construction machinery or industrial machinery having a multilayer coating film, the method comprising the step of forming a multilayer coating film by using the method according to claim 2.

### Claim 11 (depends on 3)

A method for producing construction machinery or industrial machinery having a multilayer coating film, the method comprising the step of forming a multilayer coating film by using the method according to claim 3.

### Claim 12 (depends on 4)

A method for producing construction machinery or industrial machinery having a multilayer coating film, the method comprising the step of forming a multilayer coating film by using the method according to claim 4.

### Claim 13 (depends on 6)

A method for producing construction machinery or industrial machinery having a multilayer coating film, the method comprising the step of forming a multilayer coating film by using the method according to claim 6.

### Claim 14 (depends on 7)

A method for producing construction machinery or industrial machinery having a multilayer coating film, the method comprising the step of forming a multilayer coating film by using the method according to claim 7.

### Claim 15 (depends on 8)

A method for producing construction machinery or industrial machinery having a multilayer coating film, the method comprising the step of forming a multilayer coating film by using the method according to claim 8.

### Claim 16 (depends on 9)

A method for producing construction machinery or industrial machinery having a multilayer coating film, the method comprising the step of forming a multilayer coating film by using the method according to claim 9.