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US 5,078,907 AGranted
Unsymmetrical dicarboxylic esters as bleach precursors
AssigneeLever Brothers Company, Division of Conopco, Inc.
InventorsStephen A. Madison, Pamela C. Lam
Life of this patent
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Abstract
A bleach precursor compound, its peroxygen derivative, and detergent compositions containing these materials are disclosed herein. The bleach precursors structurally comprise a pair of different diesters, one ester containing an electrically-charged functional group. Perhydrolysis of the precursor in the presence of hydrogen peroxide and a basic aqueous media generates a peroxycarboxylic acid.
Claims29
A bleach precursor compound having the formula:
- ##STR7## wherein:
- A is a C.sub.1 -C.sub.12 radical which is selected from the group consisting of alkylene, alkenylene, alkynylene, cycloalkylene, cycloalkenylene, alkarylene, arylene and mixtures thereof;
- X is selected from the group consisting of a quaternized heterocyclic ring system and a quaternary ammonium substituted C.sub.1 -C.sub.20 radical the hydrocarbyl portion of which is different from that of Z and selected from the group consisting of alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, alkaryl, and aryl;
- and
- Z is a leaving group whose conjugate acid has a pKa from about 6 to 13.
2 more elements
Dependencies are inferred from the claim text.