Patent ID: 8334021

Claim:
A method for reducing the level of residual aldehydes in coatings formed on flexible substrates or on substantially aldehyde free substrates comprising applying to the substrate one or more aqueous emulsion or suspension composition of (i) an acrylic polymer or silicon containing polymer that is made from, contains or degrades on storage or in use to form a lower alkyl alcohol, and (ii) one or more water-insoluble to slightly water soluble aldehyde scavenger compound in the amount of from 1 to 10 molar equivalents based on the number of molar equivalents of free aldehyde found in the polymer, the compound chosen from aminoguanidine bicarbonate (AGB), guanamine bicarbonate, aminoguanidine (di)borate, guanamine (di)borate, aminoguanidine metaphosphate, guanamine metaphosphate, aminoguanidine polyphosphate, guanamine polyphosphate, a dihydrazide of a C 6 -C 18 (aryl)alkyl dicarboxylic acid, a fatty acid salt of aminoguanidine, a fatty acid salt of a guanamine, a C 6 -C 12 carboxylic acid salt of aminoguanidine, a C 6 -C 12 carboxylic acid salt of a guanamine, an aromatic carboxylic acid salt of aminoguanidine, an aromatic carboxylic acid salt of a guanamine, an unsaturated carboxylic acid salt of aminoguanidine, an unsaturated carboxylic acid salt of a guanamine, a C 1 -C 18 alkyl substituted aminoguanidine, a C 1 -C 18 alkyl substituted guanamine, a C 6 -C 18 (alkyl)aryl substituted aminoguanidine, and a C 6 -C 18 (alkyl)aryl substituted guanamine, wherein the aqueous composition has a pH of 6 or greater, and drying the applied composition to form a coating on the substrate, whereby aldehyde emissions from thus formed coating or the resulting coated substrate are reduced.