Water-free high-solids base paints, the production thereof and the use thereof for producing multilayer paint coatings, and multilayer paint coatings comprising a base coating made of a water-free high-solids base paint

Patent metadata

Field	Value
Publication number	US-9528021-B2
Application number	US-201013265737-A
Country	US
Kind code	B2
Filing date	Apr 21, 2010
Priority date	Apr 21, 2009
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A waterless high-solids basecoat material having a solids content of at least 35% by weight, comprising (a) 1% to 10% by weight of at least one polyester binder with an acid number of at least 20 mg KOH/g, (b) 10% to 30% by weight of at least one acrylate binder, (c) 12% to 30% by weight of at least one kind of polymer microparticles, (d) 9.5% to 30% by weight of at least one crosslinking agent selected from free isocyanates, blocked isocyanates, and amino resins, (e) 1% to 3% by weight of at least one sulfonic acid catalyst, (f) 1% to 35% by weight of at least one pigment, (g) 30% to 65% by weight of at least one organic solvent, and (h) 0.5% to 47% by weight of at least one auxiliary or additive, based in each case on the total weight of the basecoat material.

First claim

What is claimed is:

1. A waterless high-solids basecoat material having a solids content of at least 35% by weight, comprising
(a) 1% to 6% by weight of at least one polyester binder which has an acid number of greater than 20 mg KOH/g,
(b) 10% to 30% by weight of at least one acrylate binder,
(c) 9.5% to 30% by weight of at least one crosslinking agent which is selected from the group consisting of free isocyanates, blocked isocyanates, and amino resins,
(d) 1% to 3% by weight of at least one sulfonic acid catalyst,
(e) 1% to 3 5% by weight of at least one pigment,
(f) 30% to 65% by weight of at least one organic solvent, and
(g) 0.5% to 47% by weight of at least one auxiliary or additive, based in each case on the total weight of the basecoat material.

2. The basecoat material of claim 1 , wherein the solids content of the basecoat material is at least 40% by weight.

3. The basecoat material of claim 1 , wherein the sulfonic acid catalyst (d) is a blocked sulfonic acid catalyst.

4. The basecoat material of claim 1 , wherein the polyester binder comprises structural units which originate from aliphatic, cycloaliphatic and/or aromatic dicarboxylic and/or polycarboxylic acids and from diols and/or polyols.

5. The basecoat material of claim 1 , wherein the polyester binder has a weight-average molecular weight of 400 to 6000 g/mol.

6. A metallic or plastics substrate coated with at least one high-solids basecoat material as claimed in claim 1 .

7. A metallic or plastics substrate of claim 6 , coated with a multicoat paint system as claimed in claim 1 .

8. The basecoat material of claim 1 , comprising 3% to 6% by weight, based in each case on the total weight of the basecoat material, of said at least one polyester binder.

9. The basecoat material of claim 1 , wherein the acrylate binder is selected from (meth)acrylate (co)polymers and derivatives obtained from (meth)acrylate (co)polymers by polymer-analogous reactions.

10. The basecoat material of claim 1 , wherein the acrylate binder comprises thio, hydroxyl, N-methylolamino, N-alkoxymethylamino, imino, carbamate, allophanate and/or carboxyl groups.

11. The basecoat material of claim 1 , comprising 2% to 6% by weight, based in each case on the total weight of the basecoat material, of said at least one polyester binder.

12. A process for preparing a waterless high-solids basecoat material as claimed in claim 1 , which comprises mixing the constituents with one another and homogenizing the mixture.

13. A multicoat paint system comprising at least one basecoat of a waterless high-solids basecoat material as claimed in claim 1 and at least one clearcoat.

14. The multicoat paint system of claim 13 , wherein the dry film thickness of the basecoat is 10-20 μm.

15. The multicoat paint system of claim 13 , which comprises precisely one basecoat and precisely one clearcoat.

16. The multicoat paint system of claim 14 , wherein the dry film thickness of the basecoat is 10-16 μm.

17. The multicoat paint system of claim 14 , wherein the dry film thickness of the basecoat is 11-13 μm.

18. A process of producing a multicoat paint system, comprising applying the waterless high-solids basecoat material of claim 1 to a substrate.

19. A process for producing a multicoat paint system which comprises applying, in this order—
a. first at least one waterless high-solids basecoat material as claimed in claim 1 , and subsequently
b. at least one clearcoat material—

to an optionally precoated substrate.

20. The process of claim 19 , wherein the clearcoat material has a solids fraction of at least 40% by weight.

Assignees

• Low Norbert
• Duchnik Veronika
• Lavalaye Jorn
• Basf Coatings Gmbh

Inventors

• Low Norbert
• Duchnik Veronika
• Lavalaye Jorn

Classifications

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08L67/00

  Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers · CPC title

• Y10T428/31786

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

• C08K5/29

  Compounds containing {one or more} carbon-to-nitrogen double bonds · CPC title

• Y10T428/265

  1 mil or less · CPC title