Ester perhydrolysis by preconcentration of ingredients

Claim 1

A bleaching composition comprising: (i) a peroxygen compound capable of generating perhydroxyl anion in an aqueous solution; and (ii) an organic carbonate bleach precursor having a leaving group whose conjugate asset has a pKa of greater than 13 and a structure which is: ##STR5## wherein: ##STR6## R 1 , R 2 and R 3 are each a radical selected from the group consisting of alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, alkaryl, aryl, phenyl, hydroxyalkyl, polyoxyalkylene, and R 4 (O) m C(O) n R 1 ; R 4 is selected from a bridging group consisting of alkylene, cycloalkylene, alkylenephenylene, phenylene, arylene, and polyalkoxylene, and wherein the bridging group can be unsubstituted or substituted with C 1 -C 20 atoms selected from the group consisting of alkyl, alkenyl, benzyl, phenyl and aryl radicals; Z - is a monovalent or multivalent anion leading to charge neutrality when combined with Q + in the appropriate ratio and wherein Z + is sufficiently oxidatively stable not to interfere significantly with bleaching by a peroxy carbonic acid; Q is nitrogen; m and n are 1; and B is A or an alkyl radical; and the peroxygen compound and precursor being present in a relative molar ratio of greater than about 1:1.