Bleach composition
AssigneeLever Brothers Company
InventorsRoger B. Cox, David C. Steer, John R. Woodward
Life of this patent
Estimating the term…
Abstract
A liquid bleach composition comprises a hydrogen peroxide precursor which includes as an enzyme an alcohol oxidase and as a substrate for the enzyme the corresponding alcohol, the enzyme and the substrate being incapable of substantial interaction in the composition. The composition contains less than 1 unit of catalase for every 2 units of the alcohol oxidase so that peroxide formation, when the composition is diluted with 100 times its volume of water to trigger the interaction of the enzyme and its substrate, it not substantially impaired. The diluted composition has a pH value of from 7.5 to 11. Preferably, the composition also comprises detergent active compound.
Claims20
An aqueous liquid bleach composition comprising a hydrogen peroxide precursor comprising
- (a) from 50 to 1000 units per ml of the composition of a C.sub.1 to C.sub.4 alkanol oxidase enzyme, and
- (b) from 5 to 25% by weight of the composition of a C.sub.1 to C.sub.4 alkanol substrate;
- the enzyme and substrate being incapable of substantial interaction in the composition to form hydrogen peroxide until the composition is diluted with water;
- the composition containing less than 1 unit of catalase for every 2 units of alkanol oxidase;
- and the composition on dilution with 100 times its volume of water having a pH value of from 7.5 to 11.
An aqueous liquid detergent bleach composition which comprises
- (i) from 1 to 90% by weight of detergent active compound;
- (ii) a hydrogen peroxide precursor comprising
- (a) from 50 to 1000 units of ethanol oxidase per ml of the composition;
- and
- (b) from 5 to 25% by weight of ethanol;
- the ethanol oxidase and ethanol being incapable of substantial interaction in the composition to form hydrogen peroxide until the composition is diluted with water, and
- (iii) from 0.1 to 10% by weight of organic bleach activator;
- the composition containing less than 1 unit of catalase for every 2 units of ethanol oxidase;
- and
- the composition on dilution with 100 times its volume of water having a pH value of from 7.5 to 11.
An aqueous liquid detergent bleach composition which comprises
- (i) from 1 to 90% by weight of detergent active compound;
- (ii) a hydrogen peroxide precursor comprising
- (a) from 50 to 1000 units of ethanol oxidase per ml of the composition;
- and
- (b) from 5 to 25% by weight of ethanol;
- the ethanol oxidase and ethanol being incapable of substantial interaction in the composition to form hydrogen peroxide until the composition is diluted with water;
- and
- (iii) a source of heavy metal ions of the transition series;
- the composition containing less than 1 unit of catalase for every 2 units of ethanol oxidase;
- and
- the composition on dilution with 100 times its volume of water having a pH value of from 7.5 to 11.
Dependencies are inferred from the claim text.