Pigmented coating agent and method for producing a multilayer coating using the pigmented coating agent for producing a pane adhesion

Patent metadata

Field	Value
Publication number	US-9528025-B2
Application number	US-201414898772-A
Country	US
Kind code	B2
Filing date	May 20, 2014
Priority date	Jun 21, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

The present invention relates to a solvent-based, pigmented coating composition having a solids content of at least 35%, comprising
(A) at least one melamine resin, (B) at least one pigment, (C) at least one organic solvent, and (D) at least one organosiloxane of the general formula (I)

where R 1 =C n H 2n with n=1 to 3; R 2 =H or C m H 2m+1 with m=1 to 4; a=0 to 20; b=0 to 20; and a+b=2 to 40. The present invention further relates to a process for producing a multicoat coating system, using the coating composition, and to the use of the multicoat coating system for adhesively bonding glazing sheets.

First claim

The invention claimed is:

1. A solvent-based, pigmented coating composition having a solids content of at least 35%, comprising
(A) at least one melamine resin,
(B) at least one pigment,
(C) at least one organic solvent, and
(D) at least one organosiloxane of the general formula (I)

where R 1 =C n H 2n with n=1 to 3; R 2 =H or C m H 2m+1 with m=1 to 4; a=0 to 20; b=0 to 20; and a+b=2 to 40.

2. The solvent-based, pigmented coating composition as claimed in claim 1 , which comprises (E) at least one acrylate polymer, polyurethane polymer, and/or polyester as a binder.

3. The solvent-based, pigmented coating composition as claimed in claim 2 , wherein the binder (E) has an OH number of 15 to 300 mg KOH/g.

4. The solvent-based, pigmented coating composition as claimed in claim 2 , wherein at least one polyester is included as binder (E).

5. The solvent-based, pigmented coating composition as claimed in claim 1 , wherein at least one aluminum flake pigment is included as pigment (B).

6. The solvent-based, pigmented coating composition as claimed in claim 1 , wherein for the organosiloxane (D) R 1 =C 2 H 4 ; R 2 =H or CH 3 ; a=2 to 18; b=0 to 10; and a+b=4 to 20.

7. The solvent-based, pigmented coating composition as claimed in claim 6 , wherein for the organosiloxane (D) R 1 =C 2 H 4 , R 2 =H; a=5 to 15; and b=0.

8. A process for producing a multicoat paint system, in which
(a) at least one basecoat material is applied to a substrate,
(b) a polymer film is formed from the basecoat material applied in stage (a),
(c) at least one clearcoat material is applied to the resultant basecoat film, and subsequently
(d) the basecoat film is cured together with the clearcoat material applied in stage (c),

which comprises using as the basecoat material a coating composition as claimed in claim 1 , and with the topmost coat of the multicoat paint system being the clearcoat film.

9. The process as claimed in claim 8 , wherein first at least one primer and then at least one surfacer are applied to the substrate before the basecoat material is applied.

10. The process as claimed in claim 8 , wherein said clearcoat material used is a solvent-based clearcoat material having a solids content of at least 45%.

11. The process as claimed in claim 8 , wherein the clearcoat material comprises at least one polyurethane resin and/or polyacrylate resin and/or polyester resin comprising hydroxyl groups and/or carbamate groups as binder and at least one melamine resin as crosslinking agent.

12. The process as claimed in claim 8 , wherein said substrate used is a metallic substrate or a plastics substrate.

13. A multicoat paint system produced by a process as claimed in claim 8 .

14. A process for producing a multicoat coating system, in which
(1) a multicoat paint system as claimed in claim 13 is produced and
(2) an adhesive is applied directly to the topmost clearcoat film of the multicoat paint system, forming a layer of adhesive.

15. A multicoat coating system produced by the process as claimed in claim 14 .

16. A method for adhesively bonding a glazing sheet on a substrate coated with a multicoat coating system, wherein
(1) a multicoat paint system as claimed in claim 13 is produced,
(2) an adhesive is applied directly to the topmost clearcoat film of the multicoat paint system, forming a layer of adhesive on the multicoat paint system,
and
(3) a glazing sheet is applied to the layer of adhesive and then the adhesive is cured.

Assignees

• Basf Coatings Gmbh

Inventors

• Kunszt Carmen
• Loew Norbert
• Farwick Thomas
• Feldmann Bjoern

Classifications

• C09D7/70

  characterised by shape, e.g. fibres, flakes or microspheres · CPC title

• C09D7/63

  organic · CPC title

• C09D7/65

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title

• B60J10/00

  Sealing arrangements · CPC title

• C08G77/46

  containing polyether sequences · CPC title