Method of producing multi-layer coatings

• US 6,025,033 A
• Filed: 11/05/1998
• Issued: 02/15/2000
• Est. Priority Date: 11/05/1997
• Status: Expired due to Fees

• Current Assignee: Herberts Gesellschaft Mit Beschrankter Haftung
• Original Assignee: Herberts GmbH (Corteva, Inc.)
• Inventors: Kalke, Herbert, Herrmann, Friedrich
• Primary Examiner(s): DUDASH, DIANA L
• Application Number:
  US09/186,327
• Time in Patent Office: 467 Days
• Field of Search: 427/409, 427/407.1, 427/385.5, 427/388.2, 427/140, 427/142
• US Class Current: 427/407.1
• CPC Class Codes: B05D 7/532 the two layers being cured or baked together, i.e. wet on wet
• CPC Class Codes: C09D 175/04 Polyurethanes

Abstract

A method of producing a multi-layer coating comprising the application of a color- and/or effect-imparting base lacquer coat of an aqueous base lacquer, the wet-into-wet-application on to the aqueous base lacquer coat of a clear lacquer coat of a two-component polyurethane clear lacquer, which is produced shortly before the application thereof by mixing a master lacquer component, which contains hydroxy-functional binder vehicles and solvents, with a polyisocyanate component, and joint stoving of the aqueous base lacquer and clear lacquer coats, wherein the two-component polyurethane clear lacquer which is used contains 0.01 to 1% by weight, with respect to the clear lacquer solids, of one or more additives with a surface tension-lowering effect, wherein at least 25% by weight of the additives with a surface tension-lowering effect is contained in the polyisocyanate hardener component before mixing.

Claims

1. A method of producing a multi-layer coating, comprising the application of a colour- and/or effect-imparting base lacquer coat of an aqueous base lacquer, the-wet-into-wet-application on to the aqueous base lacquer coat of a clear lacquer coat of a two-component polyurethane clear lacquer, which is produced shortly before the application thereof by mixing a master lacquer component, which contains hydroxy-functional binder vehicles and solvents, with a polyisocyanate component, and joint stoving of the aqueous base lacquer and clear lacquer coats, characterised in that the two-component polyurethane clear lacquer which is used contains 0.01 to 1% by weight, with respect to the clear lacquer solids, of one or more additives with a surface tension-lowering effect, wherein at least 25% by weight of the additives with a surface tension-lowering effect is contained in the polyisocyanate hardener component before mixing.

2. A method according to claim 1, characterised in that a two-component polyurethane clear lacquer is used, the polyisocyanate hardener component of which contains at least 50% by weight of additives with surface tension-lowering effect before mixing.