Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1999-10-04
2002-07-09
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S309000
Reexamination Certificate
active
06417151
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to use of activators which, when subjected to perhydrolysis, release a carboxylic acid with elimination of a leaving group suitable as a substrate for enzymes, more particularly redox-active enzymes, for boosting the bleaching effect of peroxygen compounds, more particularly inorganic peroxygen compounds, and to laundry detergents, cleaners and disinfectants which contain such activators and a peroxygen compound.
2. Discussion of Related Art
Inorganic peroxygen compounds, more particularly hydrogen peroxide, and solid peroxygen compounds which dissolve in water and release hydrogen peroxide in the process, such as sodium perborate and sodium carbonate perhydrate, having long been used as oxidizing agents for disinfecting and bleaching purposes. In dilute solutions, the oxidizing effect of these substances depends to a large extent on the temperature. For example, with H
2
O
2
or perborate in alkaline bleaching liquors, sufficiently rapid bleaching of soiled textiles is only achieved at temperatures above about 80° C. At lower temperatures, the oxidizing effect of the inorganic peroxygen compounds can be improved by addition of so-called activators for which there have been numerous proposals in the literature, above all from the classes of N- or O-acyl compounds, for example polyacylated alkylenediamines, more especially tetraacetyl ethylenediamine, acylated glycolurils, more especially tetraacetyl glycoluril, N-acylated hydantoins, hydrazides, triazoles, hydrotriazines, urazoles, diketopiperazines, sulfuryl amides and cyanurates, also carboxylic anhydrides, more especially phthalic anhydride, carboxylic acid esters, more especially sodium nonanoyloxybenzenesulfonate, sodium isononanoyloxybenzenesulfonate, and acylated sugar derivatives, such as pentaacetyl glucose. By adding these substances, the bleaching effect of aqueous peroxide liquors can be increased to such an extent that the same effects are obtained at temperatures as low as 60° C. as are obtained with the peroxide liquor alone at 95° C. The bleach-boosting effect of such substances is essentially attributable to the fact that, in the presence of peroxygen compounds, i.e. under perhydrolysis conditions, percarboxylic acids which generally have a greater oxidizing or bleaching effect than the peroxygen compound used are formed from the substances with elimination of the rest of the molecule, the so-called leaving group.
In the search to find energy-saving washing and bleaching processes, application temperatures well below 60° C. and, more particularly, below 45° C. down to the temperature of cold water have acquired increasing significance in recent years.
At temperatures as low as these, the effect of hitherto known activator compounds generally undergoes a distinct deterioration. Accordingly, there has been no shortage of attempts to develop more effective activators for this temperature range although, hitherto, they have failed to produce any convincing results. The problem addressed by the present invention also was to improve the oxidizing and bleaching effect of inorganic peroxygen compounds at low temperatures below 80° C. and, more particularly, in the temperature range from about 15° C. to 45° C.
DESCRIPTION OF THE INVENTION
It has now been found that, where compounds of the above-mentioned type which releases percarboxylic acids under perhydrolysis conditions are used as activators, more particularly in this temperature range, a substantial increase in the oxidizing and bleaching effect of peroxygen compounds, more especially inorganic peroxygen compounds, in oxidizing, bleaching, washing, cleaning or disinfecting solutions is achieved when, on perhydrolysis, these compounds release a leaving group which may be used as a substrate for enzymes, more particularly redox-active enzymes.
Preferred bleach activators which release an enzyme substrate leaving group of the type in question under perhydrolysis conditions include quaternized carboxylic acid alkanolamine esters, so-called esterquats. Esterquats are known group of cationic surfactants which are normally obtained by esterification of alkanolamines, such as triethanolamine, or triethanolamine polyglycol ethers with carboxylic acids and subsequent quaternization in organic solvents. By virtue of their fabric-softening effect, they have hitherto largely been used in detergents and, more particularly, laundry aftertreatment compositions. The production and properties of esterquats are described, for example, in International patent application WO 91/01295 and in the synoptic articles by O. Ponsati in C.R. CED Congress, Barcelona, 167 (1992) and R. Puchta in C.R. CED Congress, Sitges, 59 (1993).
In the context of the invention, esterquats are understood to be quaternized carboxylic acid monoesters, diesters or triesters corresponding to general formula (I):
in which R
1
CO— is a saturated and/or unsaturated acyl group containing 2 to 22 carbon atoms, more especially 2 to 12 carbon atoms and preferably 8 to 10 carbon atoms, R
2
is an optionally substituted, linear or branched alkyl, alkenyl or aryl group containing 1 to 22 carbon atoms, more particularly 1 to 3 carbon atoms, or the group —X—OH, R
3
and R
4
independently of one another have the same meaning as R
2
or stand for R
1
CO—O—X—, X is a linear or branched alkylene group containing 2 to 22 carbon atoms optionally interrupted by 1 to 10 oxygen atoms and Z
−
is a charge-equalizing anion, more especially halide, methosulfate or ethosulfate.
Preferred compounds of formula (I) are those in which at least one of the substituents of the quaternized nitrogen atom contains an alkylene group interrupted by oxygen atoms (X in formula I). The group O—X is preferably an optionally oligomeric ethyleneoxy and/or propyleneoxy group, the degrees of oligomerization in these groups preferably being from 2 to 5. The number of groups R
1
CO in the compounds corresponding to formula (I) is 1 to 3. Quaternization products of technical mono-/di-/triester mixtures, in which the degree of esterification, i.e. the average number of groups R
1
CO per molecule, is between 1.2 and 2.2 and preferably between 1.5 and 1.9, are preferably used. Derivatives of esters which are derived from technical C
12/18
or C
16/18
fatty acids, for example palm oil fatty acid, cocofatty acid or tallow fatty acid, and which may have an iodine value of 0 to 40 may also be used. Esterquats such as these are perhydrolyzed in the presence of hydrogen peroxide with cleavage of the ester bonds and release of the percarboxylic acid R
1
COOOH. A compound corresponding to general formula II:
in which X, R
2
, R
3
, R
4
and Z have the same meaning as in formula (I), is formed from the leaving group.
The above-mentioned substituents in R
2
may be, for example, halogens, such as chlorine, fluorine or iodine, an also ionic groups, such as sulfate, sulfonate, carboxylate, phosphate or phosphonate, or the acid groups on which they are based. In the last-mentioned cases, the anion (Z
−
in formula I) may even be absent.
The bleach activator containing an enzyme substrate leaving group, preferably an esterquat corresponding to formula (I), is preferably used for bleaching colored soils in the washing of textiles, more especially in an aqueous surfactant-containing liquor. The expression “bleaching of colored soils” is meant to be interpreted as its broadest sense and encompasses both the bleaching of soil present on the textile, the bleaching of soil detached from the textile and present in the wash liquid and the inhibition of dye transfer, i.e. the oxidative destruction of textile dyes present in the wash liquor, having been detached from the textiles under the washing conditions, before they can be absorbed by textiles of a different color. Where esterquats are used as the bleach activator in this preferred application, their fabric-softening properties can be instrumental as another advantage of the invention unless of course the esterquat is completely destroye
Grothus Marita
Kottwitz Beatrix
Pegelow Ulrich
Prueser Inken
Uphues Guenter
Gupta Yogendra N.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Murphy Glenn E.J.
Petruncio John M
LandOfFree
Activators for peroxide compounds in detergents and cleaning... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Activators for peroxide compounds in detergents and cleaning..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Activators for peroxide compounds in detergents and cleaning... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2869503