Coating compounds, a process for their production and their use for the production of coatings

US6319981A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rolf Dhein · Krefeld, DE
• Knud Reuter · Krefeld, DE
• Lothar Backer · Gräfenhainichen, DE
• Joachim Probst · Leverkusen, DE
• Werner Kubitza · Leverkusen, DE
• Rainer Rettig · Amagasaki, JP

Key dates

• Filing date: Apr 13, 1994
• Grant date: Nov 20, 2001
• Expiry date: Apr 13, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/7831
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to coating compounds of which the binder consists essentially of a combination of PA1 a) a polyol component dissolved and/or dispersed in water or a water/solvent mixture, and PA1 b) a polyisocyanate component emulsified in the solution and/or dispersion of the polyol component with a viscosity at 23.degree. C. of 50 to 10,000 mPa.s, in quantities corresponding to an equivalent ratio of isocyanate groups of component a) to alcoholic hydroxyl groups of component b) of 0.5:1 to 5:1, characterized in that component consists essentially of PA1 a1) a water-dilutable, hydroxyfunctional polycondensate resin free from urethane and sulfonate groups and having a molecular weight Mn above 500 or PA1 a2) a mixture of such a polycondensation resin with up to 100% by weight, based on the weight of the polycondensation resin, of at least one water-dilutable, hydroxyfunctional polymerization resin having a molecular weight Mn above 500. The present invention also relates to a process for the preparation of these coating compounds and to their use for the production of coatings.