WÄSSRIGE DISPERSIONEN AUS PYRAZOL-BLOCKIERTEN POLYISOCYANATEN UND DARAUS HERGESTELLTE BESCHICHTUNGEN

• Main Authors: MELCHIORS, MARTIN, PETZOLDT, JOACHIM, IRLE, CHRISTOPH, MUELLER, HEINO
• Format: Patent
• Language: German
• Published: 15.09.2005
• Edition: 7
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

The invention relates to a waterborne coating composition containing a physical mixture present in the form of a dispersion in water and optionally organic solvents and containing A at least one polyol having urethane groups and chemically bound hydrophilic groups, and B at least one polyisocyanate having no chemically bound hydrophilic groups and which is blocked with pyrazole derivatives corresponding to formula (I) wherein R1 represents a (cyclo)aliphatic hydrocarbon radical having 1 to 12, carbon atoms and wherein n is an integer from 0 to 3, the molar ratio of blocked NCO groups of crosslinking agent B to NCO-reactive groups of polyol A or binder mixtures containing polyol A is 0.2:1 to 5:1. for the production of chemical-resistant, chip-resistant and non-yellowing coatings.