Mixing system for producing water-dilutable coating agents

US6403701B1 · kind B1 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Gerhard Reusmann · Essen, DE
• Bernhard Lettmann · Drensteinfurt, DE
• Egon Wegner · Munster, DE

Key dates

• Filing date: Nov 11, 1999
• Grant date: Jun 11, 2002
• Expiry date: Nov 11, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A mixer system, for preparing two-component water-dilutable coating agents, includes a plurality of substantially water-free base colors and a pigment-free aqueous component. One or more of the base colors can be mixed together with a suitable amount of the aqueous component to match a preexisting coating color on a substrate to be repaired. Each of the base colors includes a pigment, an organic solvent and a first binder. The pigment-free aqueous component includes water and a second binder. The second binder is a polymer made from a mixture which includes a monomer component, an initiator, and an aqueous dispersion of a polyurethane resin. Cured coatings which are prepared from compositions using the disclosed mixer system exhibit improved condensation resistance, as compared with previously known coatings.