PROCESS FOR THE PREPARATION OF POLYURETDIONE RESINS

The present invention provides a process for the preparation of a carboxyl functional polyuretdione resin for the use in powder coating compositions comprising the steps a) reacting at least one isocyanate (NCO) functional uretdione with at least one alcohol in a ratio of free NCO groups to hydroxyl...

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Bibliographische Detailangaben
Hauptverfasser:	TEMELTAS, ENGIN, FLOSBACH, CARMEN
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	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 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:	The present invention provides a process for the preparation of a carboxyl functional polyuretdione resin for the use in powder coating compositions comprising the steps a) reacting at least one isocyanate (NCO) functional uretdione with at least one alcohol in a ratio of free NCO groups to hydroxyl groups in a range of 0.5 :1 to 0.5 : 3, preferably 0.5 :1 to 0.5 : 2, and, b) reacting the resulted hydroxyl functional polyuretdione with di-and/or polyfunctional acid(s) and/or their anhydride(s), wherein the resulted carboxyl functional polyuretdione resin having a carboxyl value in the range of 20 to 300 mg KOH/g, particularly 50 to 250 mg KOH/g, the carboxyl value defined according to DIN EN ISO 2114. The process according to the invention provides a carboxyl functional polyuretdione resin for the use in powder coating compositions, particularly for the use as hardener (crosslinker, curing agent) providing a higher crosslinking densitiy and provide desired technological properties, in particular, thin films and high flexibility in combination with an excellent weather resistance of the coating layers.