Coating finishing method

• US 20040180146A1
• Filed: 03/12/2004
• Published: 09/16/2004
• Est. Priority Date: 03/14/2003
• Status: Abandoned Application

• Current Assignee: Kansai Paint Company Limited
• Original Assignee: Kansai Paint Company Limited
• Inventors: Kitamura, Takashi, Inoue, Takeshi, Sugishima, Masami, Saikawa, Keiichiro, Tomita, Kenichi
• Application Number:
  US10/798,449
• Publication Number:
  US 20040180146A1
• Time in Patent Office: Days
• US Class Current: 427/407.1
• CPC Class Codes: B05D 7/14 to metal, e.g. car bodies involving a chemical reaction between the metal and the coating C23
• CPC Class Codes: B05D 7/52 Two layers
• CPC Class Codes: C08F 265/04 on to polymers of esters
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 51/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C08L51/04, C08L51/06 take precedence
• CPC Class Codes: C08L 67/08 Polyesters modified with higher fatty oils or their acids, or with resins or resin acids
• CPC Class Codes: C09D 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09D 151/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C09D151/04, C09D151/06 take precedence
• CPC Class Codes: C09D 5/02 Emulsion paints including aerosols

Abstract

The present invention relates to a coating finishing method comprising coating a water-based under coating material (I) on a surface of a metal substrate or an old coated face of a metal substrate and then coating a water-based coating material (II) comprising a water-based fatty acid-modified acryl resin as a base resin component, wherein the above water-based coating material (II) contains a pigment in a pigment volume concentration falling in a range of 5 to 45%, and the above water-based fatty acid-modified acryl resin has a form of a fine particle having an average particle diameter falling in a range of 50 to 500 nm. According to the method of the present invention, capable of being formed is a finished coating film which has a good finished appearance and which can maintain a fine view of metal surfaces used for structures such as buildings, bridges and plant facilities over a long period of time.

Claims

1. A coating finishing method comprising coating a water-based under coating material (I) on a surface of a metal substrate or an old coated face of a metal substrate and then coating on a coated surface thereof, a water-based coating material (II) comprising a water-based fatty acid-modified acryl resin as a base resin component, wherein the above water-based coating material (II) contains a pigment in a pigment volume concentration falling in a range of 5 to 45%, and the above water-based fatty acid-modified acryl resin has a form of a fine particle having an average particle diameter falling in a range of 50 to 500 nm.

2. The method as described in claim 1, wherein the water-based under coating material (I) contains a phosphoric acid base pigment.

3. The method as described in claim 1 or 2, wherein the water-based fatty acid-modified acryl resin is a resin comprising a structural unit derived from a fatty acid (a), an epoxy group-containing polymerizable unsaturated monomer (b), an acid group-containing polymerizable unsaturated monomer (c), a polymerizable unsaturated monomer (d) having an alkyl group having 4 or more carbon atoms and the other polymerizable unsaturated monomer (e).

4. The method as described in claim 3, wherein the polymerizable unsaturated monomer (d) having an alkyl group having 4 or more carbon atoms contains a polymerizable unsaturated monomer having a linear or branched hydrocarbon group having 6 or more carbon atoms.

5. The method as described in claim 3 or 4, wherein the polymerizable unsaturated monomer (d) having an alkyl group having 4 or more carbon atoms contains a polymerizable unsaturated monomer having a cycloalkyl group.

6. The method as described in any of claims 3 to 5, wherein the other polymerizable unsaturated monomer (e) contains a carbonyl group-containing polymerizable unsaturated monomer and/or a vinyl aromatic compound.

7. The method as described in any of claims 1 to 6, wherein the water-based coating material (II) further contains a hydrazine derivative.

8. The method as described in any of claims 1 to 7, wherein the water-based coating material (II) further contains at least one compound selected from the group consisting of nitrites, phytates, tannates, phosphates and polyamine compounds.

9. The method as described in any of claims 1 to 8, wherein the water-based coating material (II) forms a coating film having a water vapor permeability of 400 g/m²·

24 hr or less.

10. A coated article which is coated and finished by the method as described in any of claims 1 to 7.