Aqueous polyurethane resin dispersion, processes for its...

Details Aqueous polyurethane resin dispersion, processes for its... Aqueous polyurethane resin dispersion, processes for its...

C - Chemistry, Metallurgy

09

D

C09D 175/04 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/83 (2006.01) C08G 18/84 (2006.01) C09D 161/00 (2006.01)

Patent

CA 2104845

Abstract An aqueous coating composition which is self- drying or is crosslinked by external agents, processes and dispersions for its preparation and its use. The coating composition comprises: I) 40 to 100% by weight of a film-former in the form of an aqueous dispersion of one or more polyurethane resins having a number-average molecular mass (Mn) of from 2500 to 1,000,000 and a content of ionic groups, groups which can be converted to ionic groups, and/or hydrophilic groups of from 5 to 200 meq per 100 g of solid resin, and at least one CM-acid group per molecule and a OH-number of 0 to 100, wherein some or all of the Ch-acid groups can be reacted with one ore more compounds which are able to react with at least two CH-acid groups for chain-lengthening, and II) 60 to 0% by weight of one or more crosslinkers based on compounds which can react with at least two CH-acidic groups, based on formaldehyde condensation resins and/or polyisocyanates containing free or blocked isocyanate groups, the percentages by weight of I) and II) relating to the resin solids content and adding up to 100% by weight, and optionally pigments, fillers, organic solvents and/or conventional coating additives.

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