Patent ID: 6114295
Filing Date: 2000-09-05
Classification: D06L

Abstract:
A dry cleaning system for removing stains from fabrics comprising:(a) an effective amount of densified carbon dioxide;(b) 0.001% to 10% by weight of a surfactant having the formula: ##STR11## wherein the ratio of x:y and y' is greater than 0.5:1, R, R', an R"" are each independently a CH.sub.3, have the following formula:--(CH.sub.2).sub.a (C.sub.6 H.sub.4).sub.b (A).sub.d --{(L).sub.c (A').sub.f }.sub.n --(L').sub.g Z.sup.2 (G).sub.ha is 1-30,b is 0 or 1,C.sub.6 GH.sub.4 is an unsubstituted or substituted with a C.sub.1-10 alkyl or alkenylene which is a branched or straight chain,A and A' are each independently a linking moiety representing an ester, a keto, an ether, a thio, an amido, an amino, a C.sub.1-4 fluoroalkylene, a C.sub.1-4 fluoroalkenylene, a branched or straight chain polyalkylene oxide, a phosphate, a sulfonyl, a sulfate, an ammonium, a lactam, and mixtures thereof,d is 0 or 1;L and L' are each independently a C.sub.1-30 straight chain or branched alkyl or alkenylene or an aryl which is unsubstituted or substituted and mixtures thereof;e is 0-3;f is 0 or 1;n is 0-10;g is 0-3;Z.sup.2 is a hydrogen, a carboxylic acid, a hydroxy, a phosphato, a phosphato ester, a sulfonyl, a sulfonate, a sulfate, a branched or straight-chained polyalkylene oxide, a nitryl, a glyceryl, an aryl unsutstituted or substituted with a C.sub.1-30 alkylene or alkenylene, a carbohydrate unsubstituted or substituted with aC.sub.1-10 alkylene or alkenylene or an ammonium;G is an anion or cation selected from H.sup.+, Na.sup.+, Li.sup.+, K.sup.+, NH.sub.4.sup.+, Ca.sup.+2, Mg.sup.+2, Cl.sup.-,Br.sup.-, I.sup.-, mesylate, or tosylate, andh is 0-3;or a carboxylic acid substituted lactam having the formula ##STR12## with the proviso that at least one of R, R' or R"" is the carboxylic acid substituted lactam.