Aqueous coatings, the production thereof and the use thereof in the production of multi-layer paint coatings

US6069218A · kind A · utility

Assignee

• Herberts Gesellschaft mit beschrankter Haftung · DE

Inventors

• Bettina Vogt-Birnbrich · Solingen, DE
• Armin Gobel · Syke, DE
• Jurgen Dobert · Sprockhövel, DE
• Marcus Brunner · Wuppertal, DE

Key dates

• Filing date: Mar 8, 1999
• Grant date: May 30, 2000
• Expiry date: Mar 8, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aqueous coatings for the multi-layer painting of motor vehicles based on one or more binders and optionally crosslinking agents, pigments and/or fillers, paint industry additives and/or solvents, which contain as binder an aqueous dispersion based on polyurethane/polymer hybrid polymers having a numerical average of the molar mass (Mn) of 8000 to 1500000, a ratio by weight of polyurethane to polymer content of 0.05:1 to 50:1, a hydroxyl number of 0 to 150 mg KOH/g, based on solid resin, hydroxyl groups bound to silicon not being included when calculating the OH number, and an acid number of 1.5 to 40 mg KOH/g, based on solid resin, and a content of 0.5 to 150 mmole of silicon per 100 g of solid resin in the form of siloxane bridges (--Si--O--Si--) bound into the polyurethane content and/or in the form of silanol groups bound to the polyurethane content.