Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Reexamination Certificate
2002-02-14
2004-04-13
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
C510S276000, C510S302000, C510S441000, C510S443000
Reexamination Certificate
active
06720299
ABSTRACT:
FIELD OF INVENTION
This invention relates to the stability of air bleaching in compositions.
BACKGROUND OF INVENTION
The use of bleaching catalysts for stain removal has been developed over recent years. The recent discovery that some catalysts are capable of bleaching effectively in the absence of an added peroxyl source has recently become the focus of some interest, for example: WO9965905; WO0012667; WO0012808; WO0029537, and, WO0060045.
The shelf life of a product may be regarded as the period of time over which the product may be stored whilst retaining its required quality. A satisfactory shelf life is in many instances a crucial factor for the success of a commercial product. A product with a short shelf life generally dictates that the product is made in small batches and is rapidly sold to the consumer. It is also a concern to the owners of a brand with a short shelf life that the consumer uses the product within the shelf life otherwise the consumer may be inclined to change to a similar product of another brand. In contrast a similar product with a long shelf life may be made in larger batches, held as stock for a longer period of time and the period of time that a consumer stores She product is not of a great concern to the owners of a particular brand.
It is an object of the present invention to provide an air bleaching composition that has improved storage properties.
SUMMARY OF INVENTION
We have found that the presence of an acidic component in an air bleaching composition containing a transition metal catalyst serves to enhance the stability of a transition metal catalyst in the composition.
The present invention provides 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, wherein the component is an acidic component.
The present invention further provides a process for the preparation of an air bleaching composition the air bleaching composition having improved storage properties comprising the steps of:
optionally mixing an air bleaching catalyst with a solid cogranulant and drying to form a dry solid mixture;
granulating the dry solid mixture with a solution of a binder material; and,
optionally coating of the obtained granulate with a coating material,
characterised in that least one component selected as cogranulant, binder material or coating material is acidic.
The composition of the present invention upon addition to an aqueous environment provides a solution for bleaching a substrate in which at least 10%, preferably at least 50% and optimally at least 90% of any bleaching of the substrate is effected by oxygen sourced from the air.
DETAILED DESCRIPTION OF THE INVENTION
The Acidic Component
The acidic component according to the present invention may be water-soluble acidic polymer. The polymer may be used in the compositions according to the present invention to coat, bind or act as cogranulent to the air bleaching catalyst. In a preferred embodiment of the present invention, the air bleaching catalyst, with or without cogranulant, is agglomerated, preferably with a water-soluble acidic polymer
In one embodiment of the invention the binder material and the coating material are different water-soluble acidic polymers, but in another, preferred embodiment of the present invention, the binder material and the coating material are the same water-soluble acidic polymer.
In determining the scope of the present invention one skilled in the art will appreciate that a coating agent, a binder and a cogranulent may be regarded as providing overlapping functions. Nevertheless, a single function is all that is required to provide the advantage of the present invention. Obviously, if the acidic component is applied so that all three roles are fulfilled a greater stability may be conferred.
Suitable water-soluble monomeric or oligomeric carboxylate builders include lactic acid, glycolic acid and ether derivatives thereof as disclosed in Belgian Patent Nos. 831,368, 821,3609 and 821,370. Polycarboxylates containing two carboxy groups include the water-soluble salts of succinic acid, malonic acid, (ethylenedioxy) diacetic acid, maleic acid, diglycolic acid, tartaric acid, tartronic acid and fumaric acid, as well as the ether carboxylates described in German Offenlegenschrift 2,446,686, and 2,446,687 and U.S. Pat. No. 3,935,257 and the sulfinyl carboxylates described in Belgian Patent No. 840,623. Polycarboxylates containing three carboxy groups include, in particular, water-soluble citrates, aconitrates and citraconates as well as succinate derivatives such as the carboxymethyloxysuccinates described in British Patent No. 1,379,241, lacoxysuccinates described in British Patent No. 1,389,732, and aminosuccinates described in Netherlands Application 7205873, and the oxypolycarboxylate materials such is 2-oxa-1,1,3-propane tricarboxylates described in British Patent No. 1,387,447.
Polycarboxylates containing four carboxy groups include oxydisuccinates disclosed in British Patent No. 1,261,829, 1,1,2,2-ethane tetracarboxylates, 1,1,3,3-propane tetracarboxylates and 1,1,2,3-propane tetracarboxylates. Polycarboxylates containing sulfo substituents include the sulfosuccinate derivatives disclosed in British Patent Nos. 1,398,421 and 1,398,422 and in U.S. Pat. No. 3,936,448, and the sulfonated pyrolysed citrates described in British Patent No. 1,439,000.
Another preferred polycarboxylate builder is ethylenediamine-N,N′-disuccinic acid (EDDS) or the alkali metal, alkaline earth metal, ammonium, or substituted ammonium salts thereof, or mixtures thereof. Preferred EDDS compounds are the free acid form and the sodium or magnesium salt thereof. Examples of such preferred sodium salts of EDDS include NaEDDS, Na2EDDS and Na4EDDS.
Examples of such other magnesium salts of EDDS include MgEDDS and Mg2EDDS. The magnesium salts are the most preferred for inclusion in compositions in accordance with the invention.
The structure of the acid form of EDDS is as follows:
EDDS can be synthesised, for example, from readily available, inexpensive starting material such as maleic anhydride and ethylene diamine. A more complete disclosure of methods for synthesising EDDS from commercially available starting materials can be found in U.S. Pat. No. 3,158,635, Kezerian and Ramsay, issued Nov. 24, 1964.
The synthesis of EDDS from maleic anhydride and ethylene diamine yields a mixture of three optical isomers, [R,R],[S,S), and (S,R], due to the two asymmetric carbon atoms. The biodegradation of EDDS is optical isomerspecific, with the [S,S] isomer degrading most rapidly and extensively, and for this reason the (S,S) isomer is most preferred for inclusion in the compositions of the invention.
The [S,S] isomer of EDDS can be synthesised by heating L-aspartic acid and 1,2-dibromoethane in the presence of sodiun hydroxide. A more complete disclosure of the reaction of L-aspartic acid with 1,2-dibromoethane to form the (S,S) isomer of EDDS can be found in Neal and Rose, Stereospecific Ligands and Their Complexes of Ehtylenediaminediscuccinic Acid, Inorganic Chemistry, Vol 7 (1968), pp. 2405-2412.
Alicyclic and heterocyclic polycarboxylates include cyclopentane-cis,cis,cis-tetracarboxylates, cyclopentadienide pentacarboxylates, 2,3,4,5-tetrahydrofuran-cis,cis,cis-tetracarboxylates, 2,5-tetrahydrofuran-cis-dicarboxylates, 2,2,5,5-tetrahydrofuran-tetracarboxylates, 1,2,3,4,5,6-hexane-hexacarboxylates and carboxymethyl derivatives of polyhydric alcohols such as sorbitol, mannitol and xylitol. Aromatic polycarboxylates include mellitic acid, pyromellitic acid and the phthalic acid derivatives disclosed in British Patent No. 1,425,343. Of the above, the preferred polycarboxylates are hydroxycarboxylates containing up to three carboxy groups per mol
Chapple Andrew Paul
Strijbosch Antonius Henricus J.
Gupta Yogendra N.
Honig Milton
Petruncio John M
Unilever Home & Personal Care USA , division of Conopco, Inc.
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