SELF-CROSSLINKABLE POLYURETHANE POLYACRYLATE HYBRID DISPERSION

• Main Authors: BLUM HARALD, KRAEMER WOLFGANG, IRLE CHRISTOPH DR, ROSCHU ROLF
• Format: Patent
• Language: English
• Published: 21.09.1999
• Edition: 6
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; 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 INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; USE OF MATERIALS THEREFOR; WOODSTAINS

PROBLEM TO BE SOLVED: To improve the crosslinkability of a one-package coating composition comprising a storage-stable aqueous polyurethane polyacrylate hybrid dispersion having room temperature self-curability so that it may form a coating film of improved properties. SOLUTION: The hybrid dispersion comprises (A) 10-95 wt.% (based on the total resin solid content of the dispersion) polyurethane dispersion; (B) 5-90 wt.% (based on the total resin solid content of the dispersion) polymer prepared from a vinyl monomer mixture containing 0.5-20 wt.% (based on the total resin solid of the dispersion) acetoacetoxy-containing vinyl monomer in the presence of component A; and (C) an at least difunctional prim. or sec. amine in an amount corresponding to an equivalent ratio of the amino groups to the acetoacetoxy groups of 0.5/1 to 1.1/1, provided that the total of wt.% of components A and B is 100.