Aqueous coating compositions based on self-crosslinking polyurethane dispersions
AssigneeSaint-Gobain Weber France
InventorsPedro Miguel Ribeiro De Sousa Ferreira, Frank Hesselbarth
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Abstract
The present invention is drawn to an aqueous polyurethane dispersion comprising: —anionic polyurethane particles comprising both free pending carboxylate groups of formula —COO−M+ where M+ is a cation resulting from neutralization of carboxylic acid groups with a base, and pending carboxylate ester groups resulting from esterification of free carboxylic acid groups with an epoxysilane, —crosslinking particles made of water-insoluble transition metal compounds. It is also drawn to a method of coating a substrate comprising applying such an aqueous polyurethane dispersion onto a substrate and letting it dry, preferably without applying any heat or radiation.
Claims19
An aqueous self-crosslinking polyurethane dispersion, comprising;
- anionic polyurethane particles comprising both free pendant carboxylate groups of formula —COO−M+, wherein M+ is a cation resulting from neutralization of carboxylic acid groups with a base, and pendant carboxylate ester groups resulting from esterification of free carboxylic acid groups with an epoxysilane;
- and
- crosslinking particles comprising a water-insoluble transition metal compound, wherein the transition metal of the water-insoluble transition metal compound is selected from zinc, aluminum, tin, and tungsten.
Dependencies are inferred from the claim text.