Coating agent for corrosion-resistant coatings

Patent metadata

Field	Value
Publication number	US-10137476-B2
Application number	US-201615054923-A
Country	US
Kind code	B2
Filing date	Feb 26, 2016
Priority date	Feb 5, 2009
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

The invention relates to a multicoat color and/or effect paint system comprising, lying above one another in this order,
(1) at least one first basecoat comprising basecoat material (A), (2) preferably a second color and/or effect basecoat comprising basecoat material (B), and (3) optionally at least one transparent coating comprising clearcoat material (C),

wherein the basecoat material (A) forming the first basecoat comprises at least one binder (a.1), at least one color and/or effect pigment (a.2), and at least one water-soluble or water-dispersible, oligomeric or polymeric component (a.3) which comprises a parent structure (GK) having at least two repeating monomer units (ME) and also at least one uni- and/or multidentate, potentially anionic ligand (L) which is still capable of forming complexes after the multicoat paint system has been thermally cured.

First claim

What is claimed is:

1. A multicoat color and/or effect paint system comprising, lying above one another in this order,
(1) at least one first basecoat comprising a basecoat material (A);
(2) a second color and/or effect basecoat comprising a basecoat material (B); and
(3) at least one transparent coating comprising a clearcoat material (C);
wherein the basecoat material (A) comprises:
(a.1) at least one binder,
(a.2) at least one color or effect pigment, and
(a.3) at least one water-soluble or water-dispersible, corrosion-inhibiting, oligomeric or polymeric component comprising:
a parent structure (GK) comprising at least two repeating monomer units (ME) and
at least one uni- and/or multidentate, potentially anionic ligand (L) capable of forming complexes after the multicoat paint system has been thermally cured,
wherein the monomer units (ME) are ethylenimines units and the ligand (L) is hydroxyacetophenone.

2. The multicoat paint system as of claim 1 , wherein the basecoat material (A) and/or the basecoat material (B) is an aqueous basecoat material.

3. The multicoat paint system of claim 1 , wherein binder (a.1) comprises at least two components selected from the group consisting of water-dilutable polyester resins (a.1.1), water-dilutable polyurethane resins (a.1.2), and water-dilutable polyacrylate resins (a.1.3).

4. The multicoat paint system of claim 1 , wherein component (a.3) has a water-solubility or water-dispersibility at room temperature of at least 20 g/liter of water.

5. The multicoat paint system of claim 1 , which is applied to at least one of (i) an unprimed metallic substrate, (ii) a metallic substrate provided at least partly with a primer (G).

6. The multicoat paint system of claim 1 , wherein the binder (a.1) comprises a water-dilutable polyester resin (a.1.1), a water-dilutable polyurethane resin (a.1.2), and a water-dilutable polyacrylate resin (a.1.3).

7. The multicoat paint system of claim 1 , wherein the parent structure (GK) comprises polyethylenimine having a weight-average molecular weight (Mw) of more than 500 Daltons.

8. A process for producing a multicoat paint system of claim 1 comprising:
(1) the at least one first color and/or effect basecoat comprising the aqueous basecoat material (A) of claim 1 ,
(2) the second, color and/or effect basecoat comprising an aqueous basecoat material (B), and
(3) the at least one transparent coating comprising a clearcoat material (C), the process comprising:
applying the basecoat materials (A) and (B) and the clearcoat material (C) to at least one substrate selected from the group consisting of:
(i) an unprimed substrate,
(ii) a substrate coated with at least one uncured or partly cured primer (G), and
(iii) a substrate coated with at least one fully cured primer (G), and

jointly curing the wet films, comprising basecoat material (A), and basecoat material (B), and clearcoat material (C), and, optionally the uncured primer (G).

9. The process for producing a multicoat paint system of claim 8 , wherein the basecoat materials (A) and (B) are applied at a wet film thickness such that curing results in a joint dry film thickness of the basecoat material (A) and of the basecoat material (B) of 10 to 50 μm.

10. The process for producing a multicoat paint system of claim 9 , wherein the basecoat material (A) is applied with a wet film thickness such that curing results in a dry film thickness of the basecoat material (A) of 6 to 25 μm.

11. The process of claim 8 , wherein the parent structure (GK) comprises polyethylenimine having a weight-average molecular weight (Mw) of more than 500 Daltons.

Assignees

• Basf Coatings Gmbh

Inventors

• Richert Michael
• Duschek Wolfgang
• Dornbusch Michael

Classifications

• Y10T428/31504

  Composite [nonstructural laminate] · CPC title

• Y10T428/31786

  Of polyester [e.g., alkyd, etc.] · CPC title

• B05D2202/00

  Metallic substrate · CPC title

• B05D7/57 Primary

  the last layer being a clear coat · CPC title

• Y10T428/31681

  Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.] · CPC title