Quaternary ammonium compounds for use in bleaching systems
AssigneeLever Brothers Company
InventorsJames R. Darwent, Keith C. Francis, John Oakes, David W. Thornthwaite
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Abstract
A quaternary ammonium-substituted peroxycarboxylic acid bleach precursor, its quaternary ammonium peroxycarboxylic acid derivative, and bleaching-detergent compositions containing these materials are disclosed herein. The bleach precursor structurally comprises a quaternized ammonium group linked to a carboxyl moiety having a leaving group via an aromatic or heterocyclic bridging group which, upon perhydrolysis in the presence of hydrogen peroxide, generates a highly effective, quaternary ammonium-substituted aromatic or heterocyclic peroxycarboxylic acid bleach.
Claims6
A bleaching-detergent composition comprising:
- (i) from 2 to 40% by weight of a peroxide bleaching compound capable of yielding hydrogen peroxide in aqueous solution;
- (ii) from 0.1 to 20% by weight of a peroxycarboxylic acid precursor having the formula:
- ##STR16## wherein R.sub.1, R.sub.2 and R.sub.3 are each a radical selected from the group consisting of alkyl, alkenyl, hydroxyalkyl and polyoxyalkylene containing from 1 to 18 carbon atoms;
- or two or more of R.sub.1, R.sub.2 and R.sub.3 together with the N-atom form an optionally substituted, nitrogen-containing heterocyclic ring system;
- R.sub.4 is a bridging group selected from ##STR17## wherein each n can individually be 0, 1 or 2;
- L is a leaving group, the conjugate acid of which has a pK.sub.a in the range of from 4 to 13, and
- Z.sup.- can be a chloride, bromide, hydroxide, nitrate, methosulphate, bisulphate, acetate, sulphate, citrate, borate or phosphate anion;
- (iii) from 0 to 50% by weight of a surface-active material selected from the group consisting of anionic, nonionic, amphoteric, zwitterionic and cationic surfactants and mixtures thereof;
- (iv) from 0 to 80% by weight of a detergency builder.
Dependencies are inferred from the claim text.