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US 6,720,299 B2Granted
Bleaching composition of enhanced stability and a process for making such a composition
AssigneeUnilever Home & Personal Care USA, Division of Conopco, Inc.
InventorsAndrew Paul Chapple, Antonius Henricus J. Strijbosch
Life of this patent
Estimating the term…
Abstract
The invention relates to an air bleaching catalyst that has been coated with a polymer that serves to promote the stability of the air bleaching catalyst. The invention also provides a method of coating the air bleaching catalyst.
Claims13
An air bleaching composition having improved storage properties, for bleaching a substrate in an aqueous solution, comprising:
- particles of an air bleaching catalyst in the form of a granule comprising a transition metal complex;
- and, a component selected from the group consisting of:
- a cogranulent with said granule, a binder of said granule, and a coating of said granule, the component being an acidic component which is a water soluble acidic polymer, said polymer having a water solubility greater than 5 g/l at 20° C., a molecular weight of from 1000 to 250000, and wherein a 1% solution of said polymer has a pH of less than 7.
A process for the preparation of an air leaching composition the air bleaching composition having improved storage properties comprising the step of:
- granulating an air bleaching catalyst with a component selected from the group consisting of:
- binder, cogranulent, and a coating, the component selected being a water soluble acidic polymer, said polymer having a water solubility greater than 5 g/l at 20° C., a molecular weight of from 1000 to 250000, and wherein a 1% solution of said polymer has a pH of less than 7.
Dependencies are inferred from the claim text.