Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Reexamination Certificate
2000-04-19
2001-03-27
Gupta, Yogendra (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
C510S372000, C510S376000
Reexamination Certificate
active
06207634
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to non-aqueous laundry detergent products which are in the form of a liquid and which are in the form of stable dispersions of particulate material such as bleaching agents and/or bleach precursor.
BACKGROUND OF THE INVENTION
Detergent products in the form of liquid are often considered to be more convenient to use than are dry powdered or particulate detergent products. Said detergents have therefore found substantial favor with consumers. Such detergent products are readily measurable, speedily dissolved in the wash water, capable of being easily applied in concentrated solutions or dispersions to soiled areas on garments to be laundered and are non-dusting. They also usually occupy less storage space than granular products. Additionally, such detergents may have incorporated in their formulations materials which could not withstand drying operations without deterioration, operations which are often employed in the manufacture of particulate or granular detergent products.
Although said detergents have a number of advantages over granular detergent products, they also inherently possess several disadvantages. In particular, detergent composition components which may be compatible with each other in granular products may tend to interact or react with each other. Thus such components as enzymes, surfactants, perfumes, brighteners, solvents and especially bleaches and bleach activators can be especially difficult to incorporate into liquid detergent products which have an acceptable degree of chemical stability.
One approach for enhancing the chemical compatibility of detergent composition components in detergent products has been to formulate non-aqueous (or anhydrous) detergent compositions. In such non-aqueous products, at least some of the normally solid detergent composition components tend to remain insoluble in the liquid product and hence are less reactive with each other than if they had been dissolved in the liquid matrix. Non-aqueous liquid detergent compositions, including those which contain reactive materials such as peroxygen bleaching agents, have been disclosed for example, in Hepworth et al., U.S. Pat. No. 4,615,820, Issued Oct. 17, 1986; Schultz et al., U.S. Pat. No. 4,929,380, Issued May 29, 1990; Schultz et al., U.S. Pat. No. 5,008,031, Issued Apr. 16, 1991; Elder et al., EP-A-030,096, Published Jun. 10, 1981; Hall et al., WO 92/09678, Published Jun. 11, 1992 and Sanderson et al., EP-A-565,017, Published Oct. 13, 1993.
A particular problem that has been observed with the incorporation of bleach precursors in non-aqueous detergents, includes the chemical stability of the bleach and bleach precursor. Bleach and bleach precursors should remain chemically stable in the concentrate, while rapidly reacting with each other upon dilution in the wash liquor. EP 339 995 describes a non-aqueous liquid detergent composition comprising a persalt bleach and a bleach precursor, the composition containing a capped alkoxylated nonionic surfactant. EP 540 090 proposes to use a bleach precursor which is relatively insoluble in the non-aqueous liquid phase of the liquid detergent composition.
Given the foregoing, there is clearly a continuing need to identify and provide non-aqueous, bleach precursor containing detergent compositions in the form of liquid products that have a high degree of chemical stability in the concentrate along with an efficient bleaching performance in the wash liquor.
Accordingly, it is an object of the present invention to provide a non-aqueous detergent composition wherein the bleach precursors have improved chemical stability in the concentrate, while at the same time still being effective as bleach species in the wash liquor.
According to the present invention, there is provided a liquid non-aqueous detergent composition which is in the form of a liquid, containing a bleaching agent and/or a bleach precursor characterized in that the free water content of said liquid non-aqueous detergent composition is less than 1%, more preferably less than 0.7%.
SUMMARY OF THE INVENTION
The present invention provides a liquid non-aqueous heavy-duty detergent composition, said composition comprising a bleaching agent and a bleach precursor characterized in that the free water content of said liquid non-aqueous detergent composition is less than 1%.
DETAILED DESCRIPTION OF THE INVENTION
The particulate-containing liquid detergent compositions of this invention are substantially non-aqueous (or anhydrous) in character. According to the present invention, it has been found that improved chemical stability of the bleach activator is obtained in case the free water content of the non-aqueous liquid detergent is below 1% by weight in the liquid part of the composition. Free water as used herein means the water that remains in the liquid phase after separation of the solids by means of a centrifuge or filtration techniques. The amount of free water can be measured, for example, by Karl Fischer titration of the clear liquid after centrifugation of the solid material.
Total water content as used herein means the total amount of the free water and the bound water. Total amount of water can also be measured by Karl Fischer titration, if needed after anhydrous methanol extraction.
Without wishing to be bound by theory, it is believed that the free water is available to dissolve compounds such as bleach activators or to release hydrogen peroxide from the bleach source, thereby chemically destabilizing the bleach precursor and/or the bleaching agent.
Bleach source
An essential component of the invention is a bleach precursor and/or a bleaching agent.
Bleach precursors for inclusion in the composition in accordance with the invention typically contain one or more N- or O- acyl groups, which precursors can be selected from a wide range of classes. Suitable classes include anhydrides, esters, imides, nitriles and acylated derivatives of imidazoles and oximes, and examples of useful materials within these classes are disclosed in GB-A-1 586789.
Suitable esters are disclosed in GB-A-836988, 864798, 1147871, 2143231 and EP-A-0170386. The acylation products of sorbitol, glucose and all saccharides with benzoylating agents and acetylating agents are also suitable.
Specific O-acylated precursor compounds include 3,5,5-tri-methyl hexanoyl oxybenzene sulfonates, benzoyl oxybenzene sulfonates, cationic derivatives of the benzoyl oxybenzene sulfonates, nonanoyl-6-amino caproyl oxybenzene sulfonates, monobenzoyltetraacetyl glucose and pentaacetyl glucose. Phthalic anhydride is a suitable anhydride type precursor. Useful N-acyl compounds are disclosed in GB-A-855735, 907356 and GB-A-1246338.
Preferred precursor compounds of the imide type include N-benzoyl succinimide, tetrabenzoyl ethylene diamine, N-benzoyl substituted ureas and the N,N-N′N′ tetra acetylated alkylene diamines wherein the alkylene group contains from 1 to 6 carbon atoms, particularly those compounds in which the alkylene group contains 1, 2 and 6 carbon atoms. A most preferred precursor compound is N,N-N′,N′ tetra acetyl ethylene diamine (TAED).
N-acylated precursor compounds of the lactam class are disclosed generally in GB-A-955735. Whilst the broadest aspect of the invention contemplates the use of any lactam useful as a peroxyacid precursor, preferred materials comprise the caprolactams and valerolactams.
Suitable caprolactam bleach precursors are of the formula:
wherein R
1
is H or an alkyl, aryl, alkoxyaryl or alkaryl group containing from 1 to 12 carbon atoms, preferably from 6 to 12 carbon atoms.
Suitable valero lactams have the formula:
wherein R
1
is H or an alkyl, aryl, alkoxyaryl or alkaryl group containing from 1 to 12 carbon atoms, preferably from 6 to 12 carbon atoms. In highly preferred embodiments, R
1
is selected from phenyl, heptyl, octyl, nonyl, 2,4,4-trimethylpentyl, decenyl and mixtures thereof.
Other suitable materials are those which are normally solid at <30° C., particularly the phenyl derivatives, ie. benzoyl valerolac
Boutique Jean-Pol
Coosemans Steven Jozef Louis
Johnston James Pyott
Meyer Axel
Parry Diane
Cook C. Brant
Gupta Yogendra
Miller Steven W.
Petruncio John M.
The Procter & Gamble & Company
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