EP0912696B1 - Aqueous bleach and disinfectant - Google Patents

Description

Field of the Invention

The invention relates to new aqueous bleaching and disinfecting agents containing alkali metal hypochlorites, Alkyl ether sulfates, amine oxides, fatty acid salts and alkali metal hydroxides in selected proportions.

State of the art

In the past, such bleaches have appeared in the areas of hygiene and disinfection proven on the basis of alkali metal hypochlorites, which have a remarkable viscosity and therefore suitable for both horizontal and inclined and above all vertical treatment Surfaces. The viscosity of these agents causes the contact time between them and the surfaces to be treated is much larger than that of commercially available liquid products drain quickly from the surface.

There has been no shortage of attempts in the past to provide such viscous bleaching and disinfecting agents. For example, it has been found that certain surfactants or surfactant mixtures have a thickening effect on aqueous hypochlorite solutions. For example, EP-A 0 274 885 (ICI) recommends the use of mixtures of linear and branched amine oxides. According to the teaching of EP-A 0 145 084 (Unilever), mixtures of amine oxides with soaps, sarcosinates, taurides or sugar esters can also be used for this purpose. From the documents EP-A 0 137 551 and EP-A 0 447 261 (Unilever) 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 benzene sulfonates as a thickening component, is known. EP-A 0 156 438 reports on the use of alkylarylsulfonates as thickeners in aqueous bleaching agents which contain certain stilbene dyes as optical brighteners. The subject of ES-A 8801389 (Henkel Ibérica) are bleaching agents based on aqueous hypochlorite solutions, which predominantly contain alkyl ether sulfates and small amounts of amine oxides as surfactant components. From EP-A1 0 447 261 aqueous bleaching agent compositions containing sodium hypochlorite and anionic surfactants are also known. However, the hypochlorite concentration of these agents is 0.1 to 8 and preferably 0.5 to 5% by weight of active chlorine.

Aqueous bleaching and cleaning agents containing alkali metal hypochlorites, Alkyl sulfates, amine oxides, fatty acid and alkali metal hydroxides are known from WO-A-95/08610, WO-A-95/03383 and EP-A-0635568.

In German patent DE-C1 43 33 100 , the applicant has already proposed stable and sufficiently viscous aqueous bleaching and cleaning agents based on hypochlorites, fatty alcohol ether sulfates and amine oxides, which contain amine oxide phosphonic acids as a mandatory component. Even if the preparations are not objectionable from an application point of view, the use of phosphonic acids is not without problems with regard to the introduction of phosphorus compounds into surface waters. Since the amine oxide phosphonic acids are also comparatively expensive ingredients, there continues to be a need on the market for simple, viscous formulations which are characterized by high storage stability, chlorine resistance and good dispersing properties with a low hypochlorite content.
The object of the invention was therefore to provide new aqueous bleaching and disinfecting agents which are free from the disadvantages described.

Description of the invention

(a) 1 bis 3 Gew.-% Alkalimetallhypochlorite,

(b) 1 bis 5 Gew.-% Alkylethersulfate der Formel (I), R¹O-(CH₂CH₂O)_nSO₃X in der R¹ für einen Alkylrest mit 12 bis 18 Kohlenstoffatomen, n für Zahlen 2 bis 5 und X für Natrium oder Kalium steht,

(c) 1 bis 4 Gew.-% Aminoxide,

(d) 1 bis 4 Gew.-% Fettsäuresalze und

(e) 0,1 bis 2 Gew.-% Alkalimetallhydroxide

sowie gegebenenfalls weitere übliche Hilfs- und Zusatzstoffe. The invention relates to aqueous bleaching and disinfecting agents with a viscosity above 100 mPas - measured at 20 ° C. in a Brookfield viscometer - and free of amine oxide phosphonic acids, containing - based on the agents -

(a) 1 to 3% by weight of alkali metal hypochlorites,

(b) 1 to 5% by weight of alkyl ether sulfates of the formula (I), R ¹ O- (CH ₂ CH ₂ O) _n SO ₃ X in which R ^{1 represents} an alkyl radical having 12 to 18 carbon atoms, n represents numbers 2 to 5 and X represents sodium or potassium,

(c) 1 to 4% by weight of amine oxides,

(d) 1 to 4% by weight of fatty acid salts and

(e) 0.1 to 2 wt% alkali metal hydroxides

and, if appropriate, other customary auxiliaries and additives.

Surprisingly, it was found that bleaching agents and disinfectants of the stated composition with the desired requirement profile even without the use of amine oxide phosphonic acids can be made available if one of the ingredients mentioned in the specified Mixes quantities.

alkali metal hypochlorites

Alkali metal hypochlorites are to be understood as meaning lithium, potassium and in particular sodium hypochlorite. The hypochlorites can preferably be used in amounts of 1.5 to 2% by weight, based on the composition become.

alkyl ether

Alkyl ether sulfates are known anionic surfactants which are obtained by sulfation of nonionic surfactants of the alkyl polyglycol ether type and subsequent neutralization. The alkyl ether sulfates which are suitable for the purposes of the agents according to the invention follow the formula ( I ) R ¹ O- (CH ₂ CH ₂ O) _n SO ₃ X in which R ^{1 represents} an alkyl radical having 12 to 18 carbon atoms, n represents numbers 2 to 5 and X represents sodium or potassium. Typical examples are the sodium salts of sulfates of the C _12/14 cocoalcohol-2, -2,3- and -3-EO adduct. The alkyl ether sulfates can have a conventional or narrow homolog distribution. The alkyl ether sulfates are preferably used in amounts of 2 to 4% by weight, based on the composition.

amine oxides

in der R² für einen linearen oder verzweigten Alkylrest mit 12 bis 18 Kohlenstoffatomen sowie R³ und R⁴ unabhängig voneinander für R² oder einen gegebenenfalls hydroxysubstituierten Alkylrest mit 1 bis 4 Kohlenstoffatomen stehen. Vorzugsweise werden Aminoxide der Formel (II) eingesetzt, in der R² und R³ für C_12/14- bzw. C_12/18-Kokosalkylreste stehen und R4 einen Methyl- oder einen Hydroxyethylrest bedeutet. Ebenfalls bevorzugt sind Aminoxide der Formel (II), in denen R² für einen C_12/14- bzw. C_12/18-Kokosalkylrest steht und R³ und R⁴ die Bedeutung eines Methyl- oder Hydroxyethylrestes haben. Vorzugsweise werden die Aminoxide in Mengen von 1,5 bis 3 Gew.-% - bezogen auf die Mittel - eingesetzt.Amine oxides are also known substances, which are occasionally attributed to the cationic, but usually the nonionic surfactants. They are prepared from tertiary fatty amines, which usually have either one long and two short or two long and one short alkyl radical, and are oxidized in the presence of hydrogen peroxide. The amine oxides which are suitable for the purposes of the invention follow the formula ( II )

in which R ^{2 represents} a linear or branched alkyl radical having 12 to 18 carbon atoms and R ³ and R ⁴ independently of one another represent R ² or an optionally hydroxy-substituted alkyl radical having 1 to 4 carbon atoms. Amine oxides of the formula ( II ) are preferably used in which R ² and R ^{3 are} C _12/14 and C _12/18 cocoalkyl radicals and R4 is a methyl or a hydroxyethyl radical. Also preferred are amine oxides of the formula (II) in which R ^{2 is} a C _12/14 or C _12/18 cocoalkyl radical and R ³ and R ⁴ are methyl or hydroxyethyl. The amine oxides are preferably used in amounts of 1.5 to 3% by weight, based on the composition.

fatty acid salts

The agents according to the invention may contain fatty acid salts of the formula ( III ) as further constituents, R ⁵ CO-OX in which R ⁵ CO represents an acyl radical having 12 to 22 carbon atoms and X represents an alkali metal. Typical examples are the sodium and / or potassium salts of lauric acid, myristic acid, palmitic acid, palmoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, linoleic acid, linolenic acid, elaeostearic acid, arachic acid, gadoleic acid, behenic acid and erucic acid and their mixtures, and their mixtures the pressure splitting of technical fats and oils. Salts of technical coconut or tallow fatty acids are preferably used. Since the formulations according to the invention are strongly alkaline, it is also possible to use the fatty acids instead of the salts, which are neutralized in situ when introduced into the mixture. The fatty acid salts are preferably used in amounts of 1.5 to 2% by weight.

alkali metal hydroxides

Potassium hydroxide and in particular sodium hydroxide come into consideration as alkali metal hydroxides. which are preferably used in amounts of 1.5 to 2 wt .-% and serve the pH to set the mean to an optimal value of 12.5 to 14.

Industrial applicability

The agents according to the invention have a viscosity above 100 mPas - measured at 20 ° C. in a Brookfield viscometer - are stable on storage, resistant to chlorine consumption and stand out with an excellent dispersibility for dye pigments.

Examples of auxiliaries and additives which the preparations may further contain are further chlorine-stable surfactants or hydrotropes, such as alkyl sulfates, alkyl sulfonates, alkylbenzenesulfonates, Xylene sulfonates, sarcosinates, taurides, isethionates, sulfosuccinates, betaines, sugar esters, Fatty alcohol polyglycol ethers and alkyl oligoglycosides. Preferably the sum of these makes additional ones Surfactants at most 10 wt .-% of the total amount of surfactants in the recipe. The shared use of alkyl sulfates in amounts of 0.5 to 3% by weight is particularly preferred. Furthermore can the agents active chlorine-stable fragrances, optical brighteners, dyes and pigments in a total of 0.01 to 0.5 wt .-% - based on the agent - included. To those as active chlorine resistant Known fragrances include, for example, monocyclic and bicyclic monoterpene alcohols and their esters with acetic or propionic acid (e.g. isoborneal, dihydroterpene oil, Isobomylacetate, dihydroterpenylacetate). The optical brighteners can be, for example the potash salt of 4,4'-bis (1,2,3-triazolyl) - (2-) - stilbin-2,2-sulfonic acid act under the brand name Phorwite® BHC 766 is sold. The color pigments include green chlorophthalocyanines (Pigmosol® Green, Hostaphine® Green) or yellow Solar Yellow® BG 300 (Sandoz) in question. The The agents according to the invention are produced by stirring. If necessary, the obtained Decant or filter product to remove foreign bodies and / or agglomerates.

Examples

The viscosity was determined at 20 ° C. using a Brookfield viscometer (model RCT, spindle No. 1 or No. 2, 200 rpm). To determine the chlorine stability, the test mixtures were stored in a colorless plastic bottle under the influence of daylight and the active chlorine content was determined. The formulas R1 to R3 are according to the invention, the formulas R4 to R7 are used for comparison. The results are summarized in Table 1 (quantitative data as% by weight)

It can be seen that the preparations according to the invention are those which are amine oxidephosphonic acids Stabilizers contain not only equivalent in terms of viscosity, storage stability and chlorine consumption, but z. T. are even superior.

Claims (5)

1. Water-based bleaching and disinfecting preparations which have a viscosity above 100 mPas, as measured at 20°C in a Brookfield viscosimeter, and which are free from amine oxide phosphonic acids, characterized in that they contain - based on the preparation -

   (a) 1 to 3% by weight of alkali metal hypochlorites,

   (b) 1 to 5% by weight of C_12-18 alkyl ether sulfates corresponding to formula (I): R¹O-(CH₂CH₂O)_nSO₃X in which R¹ is an alkyl group containing 12 to 18 carbon atoms, n is a number of 2 to 5 and X stands for sodium or potassium.,

   (c) 1 to 4% by weight of amine oxides,

   (d) 1 to 4% by weight of fatty acid salts and

   (e) 0.1 to 2% by weight of alkali metal hydroxides

   and, optionally, other typical auxiliaries and additives.
2. Preparations as claimed in claim 1, characterized in that they contain sodium hypochlorite.
3. Preparations as claimed in claim 1 or 2, characterized in that they contain amine oxides corresponding to formula (II):

   

   in which R² is a linear or branched alkyl group containing 12 to 18 carbon atoms and R³ and R⁴ independently of one another have the same meaning as R² or represent an optionally hydroxysubstituted alkyl group containing 1 to 4 carbon atoms.
4. Preparations as claimed in claims 1 to 3, characterized in that they contain fatty acid salts corresponding to formula (III): R⁵CO-OX in which R⁵CO represents an acyl group containing 12 to 22 carbon atoms and X stands for an alkali metal.
5. Preparations as claimed in claims 1 to 4, characterized in that they contain sodium hydroxide.