Flowable aqueous dispersions of polycarboxylic acid corrosion inhibitors

Claim 1

A storage-stable, flowable aqueous dispersion of a solid polycarboxylic acid corrosion inhibitor comprising 25-57% by weight of a solid polycarboxylic acid corrosion inhibitor of formula I or II ##STR2## wherein Z is C 1 -C 11 alkylene, cyclohexylene or phenylene, R 1 and R 2 are each independently of the other H, C 1 -C 4 alkyl or a group --Z--COOH, R 3 is C 1 -C 12 alkyl, phenyl or a group --N(R 4 )(R 5 ), --OR 6 or --SR 6 , R 4 and R 5 are each independently of the other H, C 1 -C 12 alkyl, C 2 -C 4 hydroxyalkyl, cyclohexyl, phenyl or a group --Z--COOH, or R 4 and R 5 , when taken together, are C 4 -C 6 alkylene or 3-oxapentylene, R 6 is hydrogen, C 1 -C 12 alkyl or phenyl, m is 0 or 1, X is sulfur, oxygen or NH, R 7 is hydrogen, C 1 -C 4 alkyl, halogen, C 1 -C 4 alkoxy, carboxy, amino or nitro, R 8 , R 9 , R 10 and R 11 are each independently of one another hydrogen, C 1 -C 12 alkyl, C 1 -C 4 hydroxyalkyl, C 2 -C 6 carboxyalkyl, C 2 -C 10 alkoxyalkyl, carboxyl, phenyl or benzyl, or R 8 and R 9 , when taken together, are a direct bond, with the proviso that at least two of the groups R 8 , R 9 , R 10 and R 11 are a carboxyl or carboxylalkyl group, or an alkali metal salt, ammonium salt or amine salt, of such solid polycarboxylic acid corrosion inhibitor of formula I or II, 4- 72% by weight of water, 0.1-2% by weight of a dispersant and 0.01 to 0.5% by weight of a thickener.