EP0912696A1

EP0912696A1 - Aqueous bleach and disinfectant

Info

Publication number: EP0912696A1
Application number: EP97924946A
Authority: EP
Inventors: Mercedes Mendoza; Maite Canellas; Elisabet Dejorge
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 1996-05-24
Filing date: 1997-05-14
Publication date: 1999-05-06
Anticipated expiration: 2017-05-14
Also published as: WO1997045520A1; DE19621048C2; ES2196334T3; DE19621048A1; EP0912696B1

Abstract

Novel aqueous bleaches and disinfectants are proposed which contain, in relation to the agents, (a) 1 to 3 wt % alkaline metal hypochlorites, (b) 1 to 5 wt % alkyl ether sulphates, (c) 1 to 4 wt % amine oxides, (d) 1 to 4 wt % fatty acid salts and (e) 0.1 to 2 wt % alkaline metal hydroxides, and possibly other customary auxiliaries and additives. Even without the addition of amine oxide phosphonic acids, the preparations have sufficiently high viscosity and a very long shelf life, the ability to disperse dye pigments and chlorine stability.

Description

Aqueous bleach and disinfectant

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 bleaching agents based on alkali metal hypochlorites have proven themselves in the fields of hygiene and disinfection which have a remarkable viscosity and are therefore suitable for the treatment of horizontal as well as inclined and, above all, vertical surfaces. The viscosity of these agents has the effect 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 flow off rapidly from the surface.

In the past there has been no shortage of attempts 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 (1CI) 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 further anionic surfactants, for example alkyl sulfates, alkyl ether sulfates, secondary alkane sulfonates or alkyl benzene sulfonates as thickening agents Component known. About the sales The use of alkylarylsulfonates as thickeners in aqueous bleaching agents which contain certain stilbene dyes as optical brighteners is reported in EP-A 0 156438. ES-A 8801389 (Henkel Iberica) relates to bleaching agents based on aqueous hypochlorite solutions which, as surfactant components, predominantly contain alkyl ether sulfates and also small amounts of amine oxides. EP-A1 0 447 261 also includes aqueous bleaching agent compositions with a content known to sodium hypochlorite and anionic surfactants. However, the hypochlorite concentration of these agents is 0.1 to 8 and preferably 0.5 to 5% by weight of active chlorine.

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 in 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

The invention relates to aqueous bleaching and disinfecting agents free from 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,

(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 has been found that bleaching agents and disinfectants of the stated composition with the desired profile of requirements can also be made available without the use of amine oxide phosphonic acids if the stated ingredients are mixed in the stated amounts.

Alkali metal hypochlorites

Alkali metal hypochlorites are to be understood as 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.

Alkyl ether sulfates

Alkyl ether sulfates are known anionic surfactants which are obtained by sulfation of nonionic surfactants of the alkylpolyglycol 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 0- (CH ₂ CH2θ) „Sθ3X (I)

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 Ci2 / i4-coconut alcohol-2, - 2,3- and -3-EO adduct. The alkyl ether sulfates can have a conventional or restricted homolog distribution. The alkyl ether sulfates are preferably used in amounts of 2 to 4% by weight, based on the composition.

Amine oxides

Amine oxides are also known substances, which are occasionally attributed to the cationic, but usually the nonionic surfactants. For their preparation, one starts from tertiary fatty amines, which usually have either one long and two short or two long and one short alkyl radical, and is oxidized in the presence of hydrogen peroxide. The amine oxides which are suitable for the purposes of the invention follow the formula (II) R ³

I.

R2-N-> 0 (II)

I R *

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 R ² or an optionally hydroxyl-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} C12 / 14- and Ci∑viβ-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 C12 / 14 or C12 / 18 cocoalkyl radical and R ³ and R ^{4 have} the meaning of a methyl or hydroxyethyl radical. 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 (III)

in which R ⁵ CO is an acyl radical having 12 to 22 carbon atoms and X is 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, arachidic acid, gadoleic acid, behenic acid and erucic acid technical blends, such as those that occur during the pressure splitting of technical fats and oils. Salts of technical coconut or tallow fatty acids are preferably used. Since the recipes according to the invention are strongly alkaline, the fatty acids which are neutralized in situ when they are introduced into the mixture can also be used instead of the salts. The fatty acid salts are preferably used in amounts of 1.5 to 2% by weight. Alkali metal hydroxides

Suitable alkali metal hydroxides are potassium hydroxide and, in particular, sodium hydroxide, which are preferably used in amounts of 1.5 to 2% by weight and serve to adjust the pH of the compositions 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 in storage, resistant to chlorine consumption and are distinguished by excellent dispersibility for dye pigments.

Auxiliaries and additives which the preparations may further contain include, for example, other chlorine-stable surfactants or hydrotropes, such as alkyl sulfates, alkyl sulfonates, alkyl benzenesulfonates, xylene sulfonates, sarcosinates, taurides, isethionates, sulfosuccinates, betaines, sugar esters, Fatty alcohol polyglycol ethers and alkyl oligoglycosides. The sum of these additional surfactants preferably makes up at most 10% by weight of the total amount of surfactants in the formulation. The use of alkyl sulfates in amounts of 0.5 to 3% by weight is particularly preferred. In addition, the agents can contain active chlorine-stable fragrances, optical brighteners, dyes and pigments in a total amount of 0.01 to 0.5% by weight, based on the agents. The fragrances known to be active chlorine-resistant include, for example, monocyclic and bicyclic monoterpene alcohols and their esters with acetic or prapionic acid (for example isoborneal, dihydroterpene oil, isobomylacetate, dihydroterpenylacetate). The optical brighteners can be, for example, the potassium salt of 4,4 ^, -bis- (1 _l 2,3-triazolyl) - (2 -) - stilbin-2 _l 2-sulfonic acid, which is sold under the Phorwite® BHC brand 766 is distributed. Possible color pigments include green chlorophthalocyanines (Pigmosol® Green, Hostaphine® Green) or yellow Solar Yellow® BG 300 (Sandoz). The agents according to the invention are produced by stirring. If necessary, the product obtained can be decanted or filtered 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)

Table 1 Viscosity, storage stability and chlorine consumption

^* ) Amine oxide based on aminotrimethylenephosphonic acid

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

Claims

claims

1. Aqueous bleaching and disinfecting agents, 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,

(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,

2. Composition according to claim 1, characterized in that they contain sodium hypochlorite.

3. Composition according to claims 1 and 2, characterized in that they contain alkyl ether sulfates of the formula (I),

RiO- (CH ₂ CH ₂ 0) _n Sθ3X (I)

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.

4. Composition according to claims 1 to 3, characterized in that they contain amine oxides of the formula (II),

R ³

I R2-N-> 0 (II)

I.

R ⁴

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 R ² or an optionally hydroxyl-substituted alkyl radical having 1 to 4 carbon atoms.

5. Composition according to claims 1 to 4, characterized in that they contain fatty acid salts of the formula (III),

R ⁵ CO-OX (III)

in which R ⁵ CO is an acyl radical having 12 to 22 carbon atoms and X is an alkali metal.

6. Composition according to claims 1 to 5, characterized in that they contain sodium hydroxide.

7. Composition according to claims 1 to 6, characterized in that they have a viscosity above 100 mPas - measured at 20 ° C in a Brookfield viscometer.