POWDER COATING COMPOSITION HAVING LOW BAKING TEMPERATURE

PROBLEM TO BE SOLVED: To obtain a polyurethane powder coating composition curable at a low baking temperature and to coat a heat-resistant substrate with the composition. SOLUTION: This polyurethane powder coating composition comprises (A) a binder component which is solid at =130 deg.C and has 25-2...

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Bibliographische Detailangaben
Hauptverfasser:	LAAS HANS JOSEF DR, MEIER-WESTHUES HANS-ULRICH DR, HALPAAP REINHARD DR, KLEE HANS-PETER, FREUDENBERG ULRICH DR
Format:	Patent
Sprache:	eng
Schlagworte:	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
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a polyurethane powder coating composition curable at a low baking temperature and to coat a heat-resistant substrate with the composition. SOLUTION: This polyurethane powder coating composition comprises (A) a binder component which is solid at =130 deg.C and has 25-200 OH value and 400-10,000 number-average molecular weight, (B) a polyaddition compound which is solid at =125 deg.C, contains a uretedione group and optionally a free isocyanate and is prepared from an aliphatic and/or alicyclic diisocyanate and (C) one or more catalysts containing an N,N,N'- trisubstituted amidine group and having 12.0-47.0wt.% amidine group content [calculated as CN2 (molecular weight: 40)]. The components A and B exist in amounts to give 0.6-1.4 isocyanate groups of the component B based on each hydroxyl group existing in the component A and the amount of the component C is 0.05-5wt.% based on the total weight of the coating composition.