Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Reexamination Certificate
1999-12-17
2001-04-24
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...
C510S370000, C510S382000, C510S490000
Reexamination Certificate
active
06221827
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to new water-based bleaching and disinfecting compositions with viscoelastic, i.e. non-Newtonian, flow behavior containing alkali metal hypochlorites, alkali metal hydroxides, amphoteric surfactants, hydrotropes and sequestrants in defined quantity ratios.
PRIOR ART
In the past, bleaching compositions based on alkali metal hypochlorites which have a remarkable viscosity and which are therefore particularly suitable for the treatment of fibers and hard surfaces have been successfully used both in the field of textile treatment and in the field of hygiene and disinfection. The effect of the high viscosity of these compositions is that the contact time between them and the surfaces to be treated is considerably longer than in the case of commercially available liquid products which soon flow off.
There has been no shortage of attempts in the past to provide bleaching and disinfecting compositions as viscous as this. For example, it was found that certain surfactants or surfactant mixtures have a thickening effect on aqueous hypochlorite solutions. EP 0 274 885 A1 (ICI), for example, recommends the use of mixtures of linear and branched amine oxides. According to the teaching of EP 0 145 084 A1 (Unilever), mixtures of amine oxides with soaps, sarcosinates, taurides or sugar esters may also be used for this purpose. The use of amine oxides with soap or sarcosinate and other anionic surfactants, for example alkyl sulfates, alkyl ether sulfates, secondary alkane sulfonates or alkyl benzenesulfonates as thickening components is known from EP 0 079 102 A1, EP 0 137 551 A1 and EP 0 447 261 A1 (Unilever). EP 0 156 438 A1 reports on the use of alkylaryl sulfonates as thickeners in water-based bleaching compositions which contain certain stilbene dyes as optical brighteners. In addition, water-based bleaching compositions containing sodium hypochlorite and anionic surfactants are known from EP 0 447 261 A1. However, the hypochlorite concentration of these compositions is between 0.1 and 8% by weight and preferably between 0.5 and 5% by weight active chlorine. In German patent DE 43 33 100 C1, applicants have already proposed stable and sufficiently viscous water-based bleaching and cleaning compositions based on hypochlorites, fatty alcohol ether sulfates and amine oxides which contain amine oxide phosphonic acids as a compulsory component. Finally, U.S. Pat. No. 4,588,514 (Lever) relates to alkaline hypochlorite bleaching compositions which contain amine oxides and small quantities of alkyl ether sulfates and soaps as viscosity regulators. However, all the known products mentioned above are attended by the disadvantage of Newtonian flow behavior, i.e. the velocity gradient is proportional to the shear stress at a given temperature which, although of advantage for the washing or bleaching process, makes dosing very difficult.
Accordingly, the complex problem addressed by the present invention was to provide new water-based bleaching and disinfecting compositions which would be distinguished by the fact that they would exhibit adequate chlorine and storage stability and would have a washing and bleaching performance at least equivalent to the products of the prior art. In addition, the products would be free from clouding and, in particular, would show viscoelastic behavior which would make them easy to dose, for example when used in washing machines, and also when applied to inclined surfaces.
BRIEF DESCRIPTION OF THE INVENTION
The present invention relates to viscoelastic bleaching and disinfecting compositions containing—based on the composition
(a) 1 to 8 and preferably 2 to 6% by weight of alkali metal hypochlorites,
(b) 0.1 to 2 and preferably 1 to 1.5% by weight of alkali metal hydroxides,
(c) 0.1 to 2 and preferably 0.5 to 1% by weight of betaines,
(d) 0.1 to 1 and preferably 0.2 to 0.5% by weight of hydrotropes and
(e) 0.05 to 1 and preferably 0.1 to 0.5% by weight of sequestrants,
with the proviso that the quantities shown add up to 100% by weight with water and, optionally other auxiliaries and additives.
It has surprisingly been found that the new liquid bleaching compositions not only show excellent chlorine and storage stability and improved bleaching and washing performance, they also exhibit—above all —the desired viscoelastic behavior, i.e. the flow rate of the compositions is above all a function of the shear stress or, in other words, the viscosity of the compositions only decreases significantly during shearing.
DETAILED DESCRIPTION OF THE INVENTION
Alkali Metal Hypochlorites
Alkali metal hypochlorites in the context of the invention are understood to be lithium, potassium and, in particular, sodium hypochlorite.
Alkali Metal Hydroxides
Suitable alkali metal hydroxides are potassium hydroxide and, in particular, sodium hydroxide which are preferably used to adjust the pH value of the compositions to an optimum value of 12.5 to 14.
Betaines
Betaines are known surfactants which are mainly produced by carboxyalkylation, preferably carboxymethylation, of aminic compounds. The starting materials are preferably condensed with halocarboxylic acids or salts thereof, more particularly with sodium chloroacetate, 1 mole of salt being formed per mole of betaine. The addition of unsaturated carboxylic acids, for example acrylic acid, is also possible. Information on the nomenclature and, in particular, on the difference between betaines and “true” amphoteric surfactants can be found in the article by U. Ploog. in Seifen-Ole-Fette-Wachse, 198, 373 (1982). Other overviews on this subject have been published, for example, by A. O'Lennick et al. in HAPPI, Nov. 70 (1986), by S. Holzman et al. in Tens. Surf. Det. 23, 309 (1986), by R. Bilbo et al. in Soap Cosm. Chem. Spec. Apr. 46 (1990) and by P. Ellis et al. in Euro Cosm. 1, 14 (1994). Examples of suitable betaines are the carboxyalkylation products of secondary and, in particular, tertiary amines which correspond to formula (I):
in which R
1
represents alkyl and/or alkenyl groups containing 6 to 22 carbon atoms, R
2
represents hydrogen or alkyl groups containing 1 to 4 carbon atoms, R
3
represents alkyl groups containing 1 to 4 carbon atoms, n is a number of 1 to 6 and X is an alkali metal and/or alkaline earth metal or ammonium. Typical examples are the carboxymethylation products of hexyl methyl amine, hexyl dimethyl amine, octyl dimethyl amine, decyl dimethyl amine, dodecyl methyl amine, dodecyl dimethyl amine, dodecyl ethyl methyl amine, C
12/14
cocoalkyl dimethyl amine, myristyl dimethyl amine, cetyl dimethyl amine, stearyl dimethyl amine, stearyl ethyl methyl amine, oleyl dimethyl amine, C
16/18
tallow alkyl dimethyl amine and technical mixtures thereof. Other suitable betaines are carboxyalkylation products of amidoamines corresponding to formula (II):
in which R
4
CO is an aliphatic acyl group containing 6 to 22 carbon atoms and 0 or 1 to 3 double bonds, m is a number of 1 to 3 and R
2
, R
3
, n and X are as defined above. Typical examples are reaction products of fatty acids containing 6 to 22 carbon atoms, namely caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselic acid, linoleic acid, linolenic acid, elaeostearic acid, arachic acid, gadoleic acid, behenic acid and erucic acid and technical mixtures thereof, with N,N-dimethyl amino-ethyl amine, N,N-dimethyl aminopropyl amine, N,N-diethyl aminoethyl amine and N,N-diethyl aminopropyl amine which are condensed with sodium chloroacetate. A condensation product of C
8/18
cocofatty acid-N,N-dimethyl aminopropyl amide with sodium chloroacetate is preferably used. Other suitable starting materials for the betaines to be used in accordance with the invention are imidazolines corresponding to formula (III):
in which R
5
is an alkyl group containing 5 to 21 carbon atoms, R
6
is a hydroxyl group, an OCOR
5
or NHCOR
5
group and m is 2 or 3. These imidazolines are also known substances which may be obtained, fo
de Jorge Elisabet
Mendoza Cruz Mercedes
Gupta Yogendra
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Murphy Glenn E. J.
Ortiz Daniel S.
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