Patent ID: 7256164

Claim:
A pourable, pumpable, high concentration, aqueous, liquid surfactant composition consisting of: (a) at least one surfactant selected from the group consisting of an amphoteric surfactant and an anionic surfactant; (b) at least about 0.1% by weight on a total composition weight basis of at least one liquid-stabilizing agent selected from the group consisting of a compound of formula (I) and a salt thereof; wherein A is —NH(R 1 ), —N(R 1 )(R 2 ), or —NHCOY; R 1 and R 2 are each independently —(CH 2 ) n —OH, —(CH 2 ) n —SO 3 H, —(CH 2 ) n —PO 3 H 2 , —(CH 2 ) n —COOH, or —CH(R 3 )—COOH; R 3 is —CH 2 OH, —CH(CH 3 )—OH, —CH 2 SH, —CH 2 CONH 2 , —CH 2 CH 2 CONH 2 , —CH 2 COOH, or —CH 2 CH 2 COOH; Y is saturated or unsaturated C 1 -C 30 alkyl; n is an integer in the range of about 2 to about 6; and m is 1 or 2; (c) optionally an alkali metal halide salt; and (d) water; wherein the surfactant is present in the high concentration, aqueous, liquid surfactant composition in a concentration of at least about 25% by weight, and the liquid-stabilizing agent is present in an amount of not more than about 10% by weight, on a total composition weight basis, and wherein the composition is non-liquid in the absence of the liquid stabilizing amount of the liquid stabilizing agent at an ambient temperature of about 20° C.