PREPARATION OF AQUEOUS COATING COMPOSITION FOR BAKING

PROBLEM TO BE SOLVED: To obtain an aq. dispersion which can be dried to be powder and, after baking, exhibits resistance to water and solvents by passing a mixture of a polyol and a polyisocyanate, both of which may be if necessary rendered hydrophilic, through a specified dispersing apparatus. SOLU...

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Bibliographische Detailangaben
Hauptverfasser:	KLINKSIEK BERND, NACHTKAMP KLAUS DR, BOCK MANFRED DR, WILMES OSWALD DR, WAMPRECHT CHRISTIAN DR, KAHL LOTHAR DR
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON CORRECTING FLUIDS DYES FILLING PASTES GENERAL PROCESSES OF COMPOUNDING 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 PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain an aq. dispersion which can be dried to be powder and, after baking, exhibits resistance to water and solvents by passing a mixture of a polyol and a polyisocyanate, both of which may be if necessary rendered hydrophilic, through a specified dispersing apparatus. SOLUTION: A polyol component having a glass transition temp. above 30 deg.C and, if necessary, capable of being rendered hydrophilic, a (cyclo)aliph. polyisocyanate component having both an isocyanate group and a blocked isocyanate group and, if necessary, capable of being rendered hydrophilic, and optionally an external emulsifier are mixed together and then passed through a dispersing apparatus incorporating a flash nozzle to prepare an aq. dispersion which can form a powder coating at room temp., has an average particle size of 0.1 to 10μm, can form a film, and can be crosslinked upon being exposed to heat. According to the above constitution, a solvent-free thermosetting lacquer dispersion which can be dried as a powder can be obtd. in a cost-effective manner, and, in particular, a coating having high-quality surface properties can be provided.