Pigmented coating agent and coatings produced therefrom

Patent metadata

Field	Value
Publication number	US-10544250-B2
Application number	US-201515532248-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Dec 2, 2014
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

The present invention relates to a solventborne, pigmented coating composition, which comprises, based on the total amount of the coating composition, 0.02 to 0.75 wt % of at least one copolymer (A), where the copolymer (A) is obtainable by copolymerization of a mixture of olefinically unsaturated monomers (a) in at least one organic solvent and the copolymer (A) possesses a glass transition temperature Tg of at least −30° C.

First claim

What is claimed is:

1. A solventborne, pigmented coating composition, which comprises, based on the total amount of the coating composition, 0.02 to 0.75 wt % of at least one copolymer (A), where the copolymer (A) is obtained by copolymerization of a mixture of olefinically unsaturated monomers (a) in at least one organic solvent, the mixture of monomers (a) consists of
(a1) 10 to 60 mol % of at least one monomer of formula (I)

wherein R 1 is C 1 to C 4 alkoxy, R 2 is C 1 to C 4 alkyl, and m is 0 to 2,
and
(a2) 40 to 90 mol % of at least one further olefinically unsaturated monomer selected from the group consisting of monomers of the formulae H 2 C═CH—(C═O)—O—R x H 2 C═C(CH 3 )—(C═O)—O—R x , and H 2 C═H—O—(C═O)—R x , where R x is an alkyl radical having 1 to 20 carbon atoms,
and wherein the copolymer (A) has a glass transition temperature T g of at least −30° C.

2. The coating composition as claimed in claim 1 , wherein the fraction of the at least one copolymer (A), based on the total amount of the coating composition, is from 0.03 to 0.5 wt %.

3. The coating composition as claimed in claim 1 , wherein the monomers (a2) are at least one selected from the group consisting of monomers of the formulae: H 2 C═CH(CH 3 )—(C═O)—O—R x and H 2 C═CH—O—(C═O)—R x , wherein R x is an alkyl radical having 1 to 20 carbon atoms.

4. The coating composition as claimed in claim 1 , wherein the at least one copolymer (A) has a glass transition temperature T g of −25 to 50° C.

5. The coating composition as claimed in claim 1 , further comprising (B) at least one acrylate polymer, polyurethane polymer and/or polyester as binder.

6. The coating composition as claimed in claim 5 , wherein the binder (B) has an OH number of 15 to 350 mg KOH/g.

7. The solventborne, pigmented coating composition as claimed in claim 5 , which comprises at least one polyester as binder (B).

8. The coating composition as claimed in claim 1 , further comprising, as pigment, at least one aluminum flake pigment.

9. The coating composition of claim 1 , wherein the coating composition has a content of formaldehyde-based amino resins of less than 5 wt %, or wherein the coating composition does not comprise formaldehyde-based amino resins.

10. The coating composition of claim 1 , wherein the coating composition has a content of isocyanate-containing crosslinkers of less than 5 wt %, or wherein the coating composition does not comprise isocyanate-containing crosslinkers.

11. A method for producing a multicoat paint system, the method comprising:
(1) applying the coating composition of claim 1 as at least one basecoat material to a substrate,
(2) forming a polymer film from the basecoat material applied in (1), thereby obtaining a basecoat film,
(3) applying at least one clearcoat material to the basecoat film, and then
(4) curing the basecoat film together with the clearcoat material applied in (3),
wherein a clearcoat film is a topmost film of the multicoat paint system.

12. The method as claimed in claim 11 , wherein the substrate is a metallic substrate or a plastic substrate.

13. The method as claimed in claim 11 , wherein the substrate from (1) is a multicoat paint system which comprises defect sites.

14. The method of claim 13 , wherein the multicoat paint system, after curing the basecoat film together with the clearcoat material, has a score of at most 2 in a cross-cut test according to Ford test method BI 106-01, and wherein the multicoat paint system has a score of at least 2 in a stonechip test according to Ford test method BI 157-06.

15. The method of claim 11 , wherein the multicoat paint system has a Tukon hardness of at least 10.5.

16. The method as claimed in claim 11 , further comprising applying at least one primer and then at least one surfacer to the substrate before applying the basecoat material.

17. A multicoat paint system produced by the method as claimed in claim 11 .

Assignees

• Basf Coatings Gmbh

Inventors

• Poppe Andreas
• Loew Norbert
• Corten Cathrin
• Schnieders Britta
• Hu wei qiu

Classifications

• C08F220/1804

  C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate · CPC title

• C08L75/04

  Polyurethanes · CPC title

• C09D143/04 Primary

  Homopolymers or copolymers of monomers containing silicon · CPC title

• C08L33/06

  of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical · CPC title

• C08L67/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title