Patent ID: 8034756

Claim:
A chelating composition suitable for low-temperature use or storage, comprising: a) 20 to 70 wt. percent of water; and b) 30 to 80 wt. percent of a first component, of the formula: wherein R is a hydroxyalkyl group having from 1 to about 10 carbon atoms; each R′ is individually selected from the group consisting of hydrogen, unsubstituted or inertly substituted alkyl groups; carbonyl-containing alkyl groups, carboxylate-containing alkyl groups, hydroxyalkyl groups and alkoxy groups; R″ has from 1 to about 10 carbon atoms and is selected from the group consisting of unsubstituted or inertly substituted alkyl groups; carbonyl-substituted alkyl groups, carboxylate-containing alkyl groups, hydroxyalkyl groups and alkoxy groups; or hydrogen; M 1 and M 2 are individually selected from the group consisting of Na+ and K+, wherein M 1 has a greater atomic weight than M 2 ; wherein x+y=n and the mole fraction of M 1 is greater than 0.70 up to 1; and wherein the weight percentages are based on the amounts of the first component and the polar solvent.