Process for the production of multi-coat lacquer coatings

• US 5,425,970 A
• Filed: 05/06/1993
• Issued: 06/20/1995
• Est. Priority Date: 05/07/1992
• Status: Expired due to Fees

• Current Assignee: Herberts Gesellschaft Mit Beschrankter Haftung
• Original Assignee: Herberts Gesellschaft Mit Beschrankter Haftung
• Inventors: Drueke, Stefan, Lahrmann, Edgar
• Primary Examiner(s): Dudash, Diana L.
• Application Number:
  US08/058,481
• Time in Patent Office: 775 Days
• Field of Search: 427/493, 427/409, 427/407.1, 427/379, 427/496, 427/517, 427/508
• US Class Current: 427/493
• CPC Class Codes: B05D 3/067 Curing or cross-linking the coating
• CPC Class Codes: B05D 3/068 using ionising radiations (gamma, X, electrons)
• CPC Class Codes: B05D 7/576 each layer being cured, at least partially, separately

Abstract

A process is described for the production of multi-coat lacquer coatings in which at least one heat-curable clear lacquer coat is applied onto a substrate provided with a pigmented base lacquer coat and is thermally cured, on top of which is applied a further clear lacquer coat based on radiation-curable coating compositions and this is cured by the action of actinic radiation. Lacquer coatings of particularly good optical quality are obtained.

Claims

1. A process for the production of a multi-coat lacquer coating by applying a clear lacquer coat onto a substrate provided with a pigmented base lacquer coat and subsequent curing of the clear lacquer coat wherein at least one heat-curable clear lacquer coat is applied onto the base lacquer coat, which is thermally cured, and then at least one further clear lacquer coat of a radiation-curable coating composition is applied and this coat is cured by UV radiation or electron beam irradiation.

2. A process according to claim 1 wherein curing the clear lacquer coat of the radiation-curable coating composition further comprises exposure to heat.

3. A process according to claim 1 wherein the clear lacquer coat of the radiation-curable coating composition is cured with UV radiation and contains at least one photoinitiator.

4. A process according to claim 2, wherein the radiation-curable clear lacquer coating composition is used which additionally contains at least one thermally activatable free-radical initiator.

5. A process according to claim 1 wherein the multi-coat lacquer coating is applied to motor vehicle bodies and the parts thereof.