Patent ID: 6239089
Filing Date: 2001-05-29
Classification: C11D

Abstract:
A method of making a cleaning concentrate comprising solubilizing an N--C.sub.6-12 alkyl pyrrolidone in an aqueous medium at concentrations of at least 0.15% comprising admixing said N--C.sub.6-12 alkyl pyrrolidone, a C.sub.6-10 alkane sulfonate, 6 to 15 wt. % of an alkaline salt selected from the group consisting of alkaline metal carbonates, alkaline metal bicarbonates and mixtures thereof providing a pH greater than 10.0 and up to 13.0, and an aqueous medium to result in a cleaning concentrate, wherein said C.sub.6-10 alkane sulfonate is present in a weight ratio to said N--C.sub.6-12 alkyl pyrrolidone of about 0.9:1 to about 5.0:1.