COATING SYSTEM

• US 20150004424A1
• Filed: 09/14/2012
• Published: 01/01/2015
• Est. Priority Date: 09/16/2011
• Status: Active Grant

• Current Assignee: Sun Chemical NV (DIC Corporation)
• Original Assignee: BASF SE
• Inventors: Kruesemann, Juliane, Henning, Rainer, Sierakowski, Claudia, Frey, Thomas, Pietsch, Annegret, Landuydt, Tom
• Granted Patent: US 10,174,213 B2
• Time in Patent Office: Days
• US Class Current: 428/523
• CPC Class Codes: C09D 101/14 Mixed esters, e.g. cellulose acetate-butyrate
• CPC Class Codes: C09D 123/06 Polyethene
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes
• CPC Class Codes: C09D 5/004 Reflecting paints; Signal paints
• CPC Class Codes: C09D 5/028 Pigments; Filters
• CPC Class Codes: C09D 7/41 Organic pigments; Organic dyes
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: Y10T 428/31938 Polymer of monoethylenically unsaturated hydrocarbon

Abstract

A coating formed on a substrate is provided which coating comprises (a) an organic NIR-transparent pigment and/or an inorganic NIR-reflective pigment; (b) a dye having a transmittance of at least 75% in the range of from 700 to 2500 nm; and (c) optionally an effect pigment; wherein said coating exhibits a total solar reflectance (TSR) of (i) ≧40%, if 60<L*<100, or (ii) ≧30%, if 30<L*≧60, or (iii) ≧20%, if 0<L*≦30, wherein L* is the lightness. The coating is suitable for an exterior-use coating like an industrial coating or a coating for vehicles, especially an automotive finish, having improved jetness.

Claims

1. A coating formed on a substrate, the coating comprising:

a polymeric binder;

(a) an organic pigment, an inorganic pigment, or both;

(b) a dye having a transmittance of at least 75% in the range of from 700 to 2500 nm; and

(c) optionally an effect pigment,

wherein the coating exhibits a total solar reflectance (TSR) of

(i) ≧

40%, if 60<

L*<

100, or

(ii) ≧

30%, if 30<

L*≦

60, or

(iii) ≧

20%, if 0<

L*≦

30,

wherein L* is a lightness.

2. The coating according to claim 1, wherein the pigment (a) is a near infrared (NIR) transparent organic pigment, a NIR reflective inorganic pigment, or both.

3. The coating according to claim 1,

wherein the coating exhibits a TSR of

(i) ≧

45%, if 60<

L*<

100, or

(ii) ≧

35%, if 30<

L*≧

60, or

(iii) ≧

25%, if 0<

L* 30.

4. The coating according to claim 1, wherein an amount of the dye (b) is from 0.01 to 10.0% by weight, based on a total weight of the pigment (a).

5. The coating according to claim 1, wherein an amount of the effect pigment (c) is from 0.1 to 60% by weight, based on a total weight of the pigment (a).

6. The coating according to claim 1, wherein the organic pigment is a NIR transparent pigment selected from the group consisting of Color Index (C.I.) Pigment Yellow 110, 139, 151;

C.I. Pigment Orange 69, 73;

C.I. Pigment Red 122, 179, 202, 254, 282;

C.I. Pigment Brown 29;

C.I. Pigment Violet 19;

C.I. Pigment Blue 15;

1, 15;

2, 15;

3, 15;

4, 15;

6, 60;

C.I. Pigment Green 7, 36;

C.I. Pigment Black 31, 32;

a perylene pigment comprising an isomer of formula Ia′

or Ib′

or a mixture thereof,

7. The coating according to claim 1, wherein the inorganic pigment is selected from the group consisting of C.I. Pigment Yellow 53, 184, C.I. Pigment Brown 24, 29, 33, 35, C.I. Pigment Blue 28, 36, C.I. Pigment Green 17, 26, 50, C.I. Pigment Black 12, 30 and a pigment preparation thereof.

8. The coating according to claim 1, wherein pigment (a) is a NIR transparent organic pigment, and the substrate is a metallic substrate.

9. The coating according to claim 1, wherein

the coating is a multilayer coating,

the multilayer comprises a primer, a basecoat comprising one or two layers, and a clearcoat as the outer layer,

the organic pigment (a) is comprised in the basecoat,

the inorganic pigment (a) is comprised in the primer, and

the dye (b) is comprised in the clearcoat or the basecoat.

10. The coating according to claim 9, wherein

the primer comprises a white pigment.

11. The coating according to claim 10, wherein the basecoat comprises an organic pigment (a) and an inorganic pigment (a).

12. The coating according to claim 1, comprising:

(a) a perylene pigment, C.I. Pigment Brown 29, or both;

(b) a dye selected from the group consisting of C.I. Solvent Black 27, 28 and 29; and

(c) optionally an effect pigment,

wherein the coating exhibits a TSR of at least 20% and L* is ≦

30.

13. The coating according to claim 12, wherein the coating exhibits a TSR of at least 25%, and L* is ≦

20.

14. The coating according to claim 1, wherein the coating is an exterior coating.

16. The coating according to claim 13, wherein L is ≦

15.

17. The coating according to claim 14, wherein the exterior coating is an industrial coating or an automotive coating.

15. A method for improving the jetness of a coating exhibiting a TSR of

(i) ≧

40%, if 60<

L*<

100, or

(ii) ≧

30%, if 30<

L*≦

60, or

(iii) ≧

20%, if 0<

L*≦

30,

wherein L* is a lightness,

the method comprising employing a dye having a transmittance of at least 75% in the range of from 700 to 2500 nm.