Coating composition for forming self-layering or self-coating lacquer systems

• US 7,186,772 B2
• Filed: 09/26/2003
• Issued: 03/06/2007
• Est. Priority Date: 09/27/2002
• Status: Expired due to Fees

• Current Assignee: Daimler AG (Mercedes-Benz Group AG)
• Original Assignee: DaimlerChrysler AG (Mercedes-Benz Group AG)
• Inventors: Mezger, Fritz, Gruber, Thomas, Holdik, Karl, Gailberger, Michael, Berkau, Reinhold, Meichsner, Georg
• Primary Examiner(s): McClendon; Sanza L.
• Application Number:
  US10/672,372
• Publication Number:
  US 20040127593A1
• Time in Patent Office: 1,257 Days
• Field of Search: 525/228, 525/191, 525/227, 524/500, 524/501, 524/502, 524/504, 524/505, 524/800, 524/804, 524/805, 524/806, 524/837, 524/845, 524/507, 522/84, 522/85, 522/86, 522/90, 522/104, 522/100, 522/108, 428/332, 428/333, 428/334, 428/341, 427/508, 427/512, 427/517, 427/283, 427/401, 427/388.4
• US Class Current: 524/501
• CPC Class Codes: B05D 1/34 Applying different liquids or other fluent materials simultaneously
• CPC Class Codes: B05D 3/0263 with IR heaters
• CPC Class Codes: B05D 3/029 with microwaves
• CPC Class Codes: B05D 3/067 Curing or cross-linking the coating
• CPC Class Codes: B05D 7/16 using synthetic lacquers or varnishes
• CPC Class Codes: B05D 7/52 Two layers
• CPC Class Codes: C09D 5/02 Emulsion paints including aerosols
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/261 In terms of molecular thickness or light wave length
• CPC Class Codes: Y10T 428/263 Coating layer not in excess of 5 mils thick or equivalent
• CPC Class Codes: Y10T 428/273 of coating

Abstract

Self-coating or self-layering lacquer systems from at least two different resins, oligomers, or polymers, which are emulsifiable or dispersible in water, have different surface tensions, and form self-layering phases. After the application, the phases separate into the components of the formulation.

Claims

1. A coating composition for formation of a self-layering or self-coating lacquer system, comprising:

at least two components selected from the group consisting of a resin, an oligomer, and a polymer, the at least two components being emulsified or dispersed in water and each of the at least two components having a different surface tension, wherein at least one of the at least two components is a UV-hardenable clear lacquer and wherein a difference in the surface tensions of the at least two components is greater than 5 mN/m.

2. The coating composition as recited in claim 1, wherein the at least two components are thermally dried or hardened by radiation.

3. The coating composition as recited in claim 2, wherein the at least two components are hardened by at least one of UV radiation, NIR radiation and IR radiation.

4. The coating composition as recited in claim 2, wherein the at least two components are dried by microwave drying.

5. The coating composition as recited in claim 1, wherein the resin and the polymer are selected from the group consisting of aminoplasts, epoxy resins, phenolic resins, polyurethane resins, polyester resins, polyvinyl acetate, amine resins, and alkyd resins.

6. The coating composition as recited in claim 5, wherein the alkyd resins include fluorine- or silicon-containing resins.

7. The coating composition as recited in claim 1, further comprising at least one starter for a radiation-induced radical polymerization.

8. The coating composition as recited in claim 1, wherein at least one of the at least two components has a surface tension lying in a range from 20 to 35 mN/m.

9. A lacquer coating produced from a coating composition as recited in claim 1, wherein one of the at least two components forms a clear lacquer coating having a thickness of 1 μ

m to 100 μ

m and wherein another of the at least two components forms a coloring coating having a thickness of 5 μ

m to 100 μ

m.

10. A lacquer coating, produced from a coating composition as recited in claim 1, wherein one of the at least two components forms a filler material layer and wherein another of the at least two components forms a base lacquer or a protective paint coat.

11. A method of coating a surface of an automobile part or component, the method comprising:

providing a coating composition according to claim 1;

using the coating composition to coat the surface of the automobile part or component.

12. A method for manufacturing a self-coating or self-layering lacquer coating, the method comprising:

introducing a first component in water so as to emulsify or disburse the first component in the water in a first mixture;

introducing a second component in water so as to emulsify or disburse the second component in the water in a second mixture, wherein each of the at least two different components are selected from the group consisting of a resin, a polymer, and an oligimer;

adding a UV hardener to at least one of the first and second mixtures;

mixing the first and second mixtures to form a coating;

applying the coating to an object;

pre-drying the coating; and

performing a final drying of the coating including at least one radiation treatment using UV light.

13. The method as recited in claim 12, wherein the applying is performed by doctor blading, electrostatically or pneumatically.