EP1047766A1

EP1047766A1 - Aqueous bleaching agents in the form of a microemulsion

Info

Publication number: EP1047766A1
Application number: EP99906103A
Authority: EP
Inventors: Rafael Pi Subirana; Joaquin Bigorra; Nuria Bonastre Gilabert
Original assignee: Cognis Deutschland GmbH and Co KG
Current assignee: BASF Personal Care and Nutrition GmbH
Priority date: 1998-01-14
Filing date: 1999-01-07
Publication date: 2000-11-02
Also published as: DE19801086C1; WO1999036502A1

Abstract

The invention relates to novel aqueous bleaching agents in the form of a microemulsion, containing a) hydrogen peroxide and b) a ternary emulsifier mixture consisting of b1) esterquats, b2) alkyl- and/or alkenyl oligoglycosides and b3) alkyl benzene sulphonates. These preparations are not only excellent bleaches and disinfectants but are also stable in storage, even if they contain over 20 wt.% hydrogen peroxide in relation to the non-aqueous part.

Description

Aqueous bleach in microemulsion form

Field of the Invention

The invention relates to aqueous bleaching agents in microemulsion form, containing hydrogen peroxide and a ternary emulsifier mixture.

State of the art

Preparations are used to clean hard surfaces, particularly in the sanitary area, which simultaneously have a bleaching and disinfecting effect. For this purpose, in addition to hypochlorite lyes, aqueous hydrogen peroxide solutions are also used, to which tensides are added as cleaning and emulsifying components.

Preparations of this type are described, for example, in the following publications: EP-A 0415652, EP-B 0431747, EP-A 0463801, EP-A 0463802, EP-A 0694607, EP-B 0530949 (Clorox), EP-A 0745664 (Eka ), EP-B 0332259, EP-B 0468103, EP-A 0751214, EP-A 0776966, EP-A 0790297, EP-A 0794245 (Procter & Gamble) and EP-B 0687293 (Unilever).

For technical reasons, it is desirable to set the hydrogen peroxide content as high as possible, but in practice this leads to problems, since preparations with more than 5% by weight of H2O2, based on the composition, are not sufficiently stable, in particular when stored at temperature, ie that their initial viscosity either collapses or increases sharply during storage. The object of the invention was therefore to provide aqueous bleaching agents with a high hydrogen peroxide content which have a sufficiently high and largely stable viscosity and at the same time have excellent cleaning properties. Description of the invention

The invention relates to aqueous bleaching agents in microemulsion form containing

(a) hydrogen peroxide and

(b) a ternary emulsifier mixture consisting of (b1) ester quats,

(b2) alkyl and / or alkenyl oligoglycosides and (b3 alkyl benzene sulfonates.

Surprisingly, it was found that preparations of the type mentioned which contain a ternary mixture of special cationic, nonionic and anionic emulsifiers as emulsifiers and are in the form of microemulsions, even when large amounts are used, for example 5 to 15% by weight, based on the preparations (or 20 to 40% by weight of hydrogen peroxide - based on the non-aqueous portion) - in addition to the desired bleaching and disinfecting action, also have a sufficiently high and constant viscosity.

Esterquats

The term “esterquats” (component b1) is generally understood to mean quaternized fatty acid triethanolamine ester salts. These are known substances which can be obtained by the relevant methods of preparative organic chemistry. In this connection, reference is made to the international patent application WO 91 / 01295 (Henkel), according to which triethanolamine is partially esterified with fatty acids in the presence of hypophosphorous acid, air is passed through and then quaternized with dimethyl sulfate or ethylene oxide. German Patent DE-C1 4308794 (Henkel) also describes a process for the preparation solid ester quats, in which the quaternization of triethanolamine esters is carried out in the presence of suitable dispersants, preferably fatty alcohols, and reviews on this topic are given, for example, by R. Puchta et al. in Tens. Surf. De, 30, 186 (1993), M .Brock in Tens.Surf.Det. 30, 394 (1993), R. Lagerman et al. In J.Am.Oil Chem.Soc, 71, 97 (1994) and I. Shapiro in Cosm.Toil. 109, 77 (1994) appeared.

The quaternized fatty acid triethanolamine ester salts follow the formula (I)

I [RiCO- (OCH ₂ CH ₂ ) mOCH2CH2-N ⁺ -CH ₂ CH ₂ 0- (CH2CH2θ) nR ² ] X- (I)

in which R ¹ CO for an acyl radical with 6 to 22 carbon atoms, R ² and R ³ independently of one another for hydrogen or R ¹ CO, R ⁴ for an alkyl radical with 1 to 4 carbon atoms or a (CH2CH2θ) _q H group, m, n and p in total stand for 0 or numbers from 1 to 12, q stands for numbers from 1 to 12 and X stands for halide, alkyl sulfate or alkyl phosphate. Typical examples of ester quats which can be used in the context of the invention are products based on caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, isostearic acid, stearic acid, oleic acid, elaidic acid, arachic acid, behenic acid and erucic acid and their technical mixtures , as they occur, for example, in the pressure splitting of natural fats and oils. Technical C12 / 18 coconut fatty acids and in particular partially hardened Ci6 / ßβ-tallow or palm fatty acids as well as elaidic acid-rich Ci6 / ιβ fatty acid cuts are preferably used. The fatty acids and the triethanolamine can be used in a molar ratio of 1.1: 1 to 3: 1 to produce the quaternized esters. With regard to the application properties of the ester quats, an application ratio of 1.2: 1 to 2.2: 1, preferably 1.5: 1 to 1.9: 1 has proven to be particularly advantageous. The preferred esterquats are technical mixtures of mono-, di- and triesters with an average degree of esterification of 1.5 to 1.9 and are derived from technical C16 / 18-tallow or palm fatty acid (iodine number 0 to 40). From an application point of view, quaternized fatty acid triethanolamine ester salts of the formula (I) have proven to be particularly advantageous in which R ¹ CO for an acyl radical having 16 to 18 carbon atoms, R ² for R ¹ CO, R ³ for hydrogen, R ⁴ for a methyl group , m, n and p is 0 and X is methyl sulfate.

In addition to the quaternized fatty acid triethanolamine ester salts, quaternized ester salts of fatty acids with diethanolalkylamines of the formula (II) are also suitable as esterquats,

R ⁴

I [R ¹ CO- (OCH ₂ CH2) mOCH2CH2-N ⁺ -CH2CH2θ- (CH2CH ₂ 0) nR ² ] X ^" (II)

IR ⁵

in which R ^{1 is} C0 for an acyl radical with 6 to 22 carbon atoms, R ² for hydrogen or R ¹ CO, R ⁴ and R ⁵ independently of one another for alkyl radicals with 1 to 4 carbon atoms, m and n in total for 0 or numbers from 1 to 12 and X represents halide, alkyl sulfate or alkyl phosphate.

Finally, a further group of suitable ester quats are the quaternized ester salts of fatty acids with 1,2-dihydroxypropyl dialkylamines of the formula (III)

R ⁶ 0- (CH ₂ CH ₂ 0) mOCR ¹ l ⁺ I

[R -N ⁺ -CH ₂ CHCH2θ- (CH ₂ CH2θ) nR ² ] X "(III)

I.

R7 in which R ¹ CO for an acyl radical with 6 to 22 carbon atoms, R ² for hydrogen or R ¹ CO, R ⁴ , R ⁶ and R ⁷ independently of one another for alkyl radicals with 1 to 4 carbon atoms, m and n in total for 0 or numbers from 1 to 12 and X represents halide, alkyl sulfate or alkyl phosphate.

With regard to the selection of the preferred fatty acids and the optimal degree of esterification, the examples given for (I) also apply to the esterquats of the formulas (II) and (III). The esterquats usually come on the market in the form of 50 to 90% strength by weight alcoholic solutions, which can be diluted with water if required.

Alkyl and / or alkenyl oligoglycosides

Alkyl and alkenyl oligoglycosides (component b2) are known nonionic surfactants which follow the formula (IV)

in which R ^{8 is} an alkyl and / or alkenyl radical having 4 to 22 carbon atoms, G is a sugar radical having 5 or 6 carbon atoms and p is a number from 1 to 10. They can be obtained according to the relevant procedures in preparative organic chemistry. As representative of the extensive literature, reference is made here to the documents EP-A1 0301298 and WO 90/03977.

The alkyl and / or alkenyl oligoglycosides can be derived from aldoses or ketoses with 5 or 6 carbon atoms, preferably glucose. The preferred alkyl and / or alkenyl oligoglycosides are thus alkyl and / or alkenyl oligoglucosides. The index number p in the general formula (IV) indicates the degree of oligomerization (DP), i.e. H. the distribution of mono- and oligoglycosides is present and stands for a number between 1 and 10. While p must always be an integer in a given compound and can in particular assume the values p = 1 to 6, the value p is for a specific alkyl oligoglycoside an analytically calculated quantity, which usually represents a fractional number. Alkyl and / or alkenyl oligoglycosides with an average degree of oligomerization p of 1.1 to 3.0 are preferably used. From an application point of view, preference is given to those alkyl and / or alkenyl oligoglycosides whose degree of oligomerization is less than 1.7 and in particular between 1.4 and 1.6.

The alkyl or alkenyl radical R ⁸ can be derived from primary alcohols having 4 to 11, preferably 8 to 10, carbon atoms. Typical examples are butanol, capro alcohol, caprylic alcohol, capric alcohol and undecyl alcohol and their technical mixtures, such as are used, for example, in the hydrogenation of technical fatty acid methyl esters or in the course of the hydrogenation of aldehydes from Roeien's oxosynthesis can be obtained. Alkyl oligoglucosides of chain length Cβ-C10 (DP = 1 to 3) are preferred which are obtained as a preliminary step in the separation of technical Cβ-Ciβ-coconut fatty alcohol by distillation and are contaminated with a proportion of less than 6% by weight of Ci2-alcohol can as well as alkyl oligoglucosides based on technical Cg / n-oxo alcohols (DP = 1 to 3). The alkyl or alkenyl radical R ⁸ can also be derived from primary alcohols having 12 to 22, preferably 12 to 14, carbon atoms. Typical examples are lauryl alcohol, myristyl alcohol, cetyl alcohol, Paim oleyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, elaidyl alcohol, petroselinyl alcohol, arachyl alcohol, gadoleyl alcohol, behenyl alcohol, erucyl alcohol, brassidyl alcohol as well as their technical mixtures can be obtained as well as their technical mixtures. Alkyl oligoglucosides based on hydrogenated Ci2 / i4 coconut alcohol with a DP of 1 to 3 are preferred.

Alkylbenzenesulfonates

Alkylbenzenesulfonates which form component (b3) are anionic surfactants which follow the formula (V)

R ^Q -Ph-SOsX (V)

in which R ^{9 is} a linear or branched alkyl radical having 12 to 18 carbon atoms, Ph is a phenyl radical and X is an alkali and / or alkaline earth metal or ammonium. Typical examples are dodecylbenzenesulfonate, tetradecylbenzenesulfonate, hexadecylbenzenesulfonate and octadecylbenzenesulfonate and their technical mixtures in the form of the sodium, potassium, calcium or ammonium salts.

Bleach composition

In a preferred embodiment of the invention, the bleaching agents contain 20 to 60, preferably 30 to 50% by weight hydrogen peroxide and 40 to 80, preferably 50 to 70% by weight surfactants, based on the nonaqueous fraction. Preparations containing - again based on the non-aqueous portion - are particularly preferred.

(a) 20 to 40, preferably 25 to 35% by weight of hydrogen peroxide,

(b1) 20 to 30, preferably 22 to 28% by weight of ester quats,

(b2) 20 to 30, preferably 22 to 28% by weight of alkyl and / or alkenyl oligoglycosides and

(b3) 20 to 30, preferably 22 to 28% by weight of alkylbenzenesulfonates with the proviso that the amounts given may be supplemented with other auxiliaries and additives to 100% by weight. As a rule, the preparations have an aqueous fraction of 50 to 90 and preferably 60 to 80% by weight. The mixtures can be prepared, for example, by introducing the aqueous emulsifiers, for example in the form of 30 to 60% by weight solutions or pastes, heating them to 70 to 80 ° C., homogenizing them and cooling them into the microemulsion obtained aqueous, for example 35 wt .-% hydrogen peroxide solution. Microemulsions are obtained which have a droplet size below 100 μm. A typical microemulsion of the invention has the following composition:

(a) 3 to 15, preferably 5 to 10% by weight of hydrogen peroxide,

(b1) 3 to 10, preferably 5 to 10% by weight of ester quats,

(b2) 3 to 10, preferably 5 to 10% by weight alkyl oligoglucoside,

(b3) 3 to 10, preferably 8 to 12% by weight of alkylbenzenesulfonates and

(c) 0 to 5, preferably 1 to 4% by weight of auxiliaries and additives

and water ad 100 wt .-%.

Industrial applicability

The aqueous bleaching agents according to the invention have a viscosity which is high enough on the one hand to ensure simple metering, and on the other hand so low that the preparations can be pumped. Compared to other products of the prior art, which have a comparatively high hydrogen peroxide concentration, they are distinguished by a particularly high storage stability. Another object of the invention therefore relates to the use of ternary mixtures consisting of esterquats, alkyl and / or alkenyl oligoglycosides and alkylbenzenesulfonates as emulsifiers for the production of bleaching agents with a minimum content of - based on the non-aqueous portion - 20 wt .-% hydrogen peroxide.

Auxiliaries and additives

Auxiliaries and additives which the preparations may further contain include, for example, other peroxide-stable surfactants or hydrotropes, such as, for example, alkyl sulfates, alkyl sulfonates, xylene sulfonates, sarcosinates, taurides, isethionates, sulfosuccinates, betaines, sugar esters, fatty alcohol polyglycol ethers, Fatty acids, soaps and (alkanol) amines. Preferably, the sum of these additional lent tensides at most 10% by weight of the total amount of surfactants in the formulation. The use of C8-C22, preferably Ci2-Ci8 fatty alcohol polyglycol ethers with degrees of ethoxylation in the range from 1 to 10 in amounts of 0.5 to 3% by weight is particularly preferred. In addition, the agents can contain peroxide-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 as peroxide-resistant include, for example, monoeyclic and bicyclic monoterpene alcohols and their esters with acetic or propionic acid (for example isoborneal, dihydroterpene oil, isobornylacetate, dihydroterpenylacetate). The optical brighteners can be, for example, the potassium salt of 4,4'-bis (1, 2,3-triazolyl) - (2 -) - stilbin-2,2-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 sequestering agent may furthermore contain electrolyte salts in amounts of 0.1 to 2 and preferably 0.5 to 1% by weight, which are polyacrylates, carbonates, silicates, phosphates, amine oxide phosphonates and lignin sulfonates and mixtures thereof can.

Examples

6 bleaches were produced by mixing different microemulsion phases, each with 27% by weight of active substance and 35% by weight of hydrogen peroxide. The viscosity of the preparations was determined using the Brookfield method in an RVF viscometer (20 ° or 40 ° C, spindle 1, 10 rpm) and the stability was assessed after a storage period of 1 to 2 months at 20 or 40 ° C . The results are summarized in Table 1. Mixtures 1 and 2 are according to the invention, and mixtures V1 to V4 are used for comparison

Table 1

Aqueous bleaching agents (quantities as% by weight)

*) two-phase

Claims

claims

1. Containing aqueous bleaching agents in microemulsion form

(a) hydrogen peroxide and

(b) a ternary emulsifier mixture consisting of (b1) ester quats,

(b2) alkyl and / or alkenyl oligoglycosides and (b3) alkyl benzene sulfonates.

2. Composition according to claim 1, characterized in that they contain esterquats of the formula (I),

R ⁴

I.

[R ¹ CO- (OCH ₂ CH2) mOCH2CH2-N ⁺ -CH2CH2θ- (CH2CH ₂ 0) nR ² ] X- (I)

in which R ¹ CO is an acyl radical having 6 to 22 carbon atoms, R ² and R ^{3 are} independently hydrogen or R ¹ CO, R ^{4 is} an alkyl radical having 1 to 4 carbon atoms or a (CH2CH2θ) _q H group, m, n and p in total stand for 0 or numbers from 1 to 12, q stands for numbers from 1 to 12 and X stands for halide, alkyl sulfate or alkyl phosphate.

according to claim 1, characterized in that they contain ester quats of the formula (II),

R ⁴

I [R ¹ CO- (OCH2CH2) _m OCH2CH2-N ⁺ -CH ₂ CH2θ- (CH ₂ CH2θ) nR ² ] X- (II)

IR ⁵

in which R ¹ CO for an acyl radical with 6 to 22 carbon atoms, R ² for hydrogen or R ¹ CO, R ⁴ and R ⁵ independently of one another for alkyl radicals with 1 to 4 carbon atoms, m and n in total for 0 or numbers from 1 to 12 and X represents halide, alkyl sulfate or alkyl phosphate.

4. Composition according to claim 1, characterized in that they contain ester quats of the formula (III),

R6 0- (CH ₂ CH ₂ 0) mOCRi

I I

[R ⁴ -N ⁺ -CH2CHCH ₂ 0- (CH2CH ₂ 0) nR ² ] X "(III)

I.

R ⁷

in which R ^{1 is} C0 for an acyl radical with 6 to 22 carbon atoms, R ² for hydrogen or R ¹ CO, R ⁴ , R ⁶ and R ⁷ independently of one another for alkyl radicals with 1 to 4 carbon atoms, m and n in total for 0 or numbers from 1 to 12 and X represents halide, alkyl sulfate or alkyl phosphate.

5. Compositions according to claims 1 to 4, characterized in that they contain alkyl and alkenyl oligoglycosides of the formula (IV),

R ⁸ 0- [G] _p (IV)

in which R ^{8 is} an alkyl and / or alkenyl radical having 4 to 22 carbon atoms, G is a sugar radical having 5 or 6 carbon atoms and p is a number from 1 to 10.

6. Composition according to claims 1 to 5, characterized in that they contain alkylbenzenesulfonates of the formula (V),

in which R ^{9 is} a linear or branched alkyl radical having 12 to 18 carbon atoms, Ph is a phenyl radical and X is an alkali and / or alkaline earth metal or ammonium.

7. Composition according to claims 1 to 6, characterized in that - based on the non-aqueous portion -

(a) 20 to 60% by weight hydrogen peroxide and

(b) 40 to 80 wt% surfactants

contain.

8. Composition according to claims 1 to 7, characterized in that - based on the non-aqueous portion - (a) 20 to 40% by weight hydrogen peroxide,

(b1) 20 to 30% by weight of ester quats,

(b2) 20 to 30% by weight of alkyl and / or alkenyl oligoglycosides and

(b3) 20 to 30% by weight of alkylbenzenesulfonates

with the proviso that the amounts given may be supplemented with other auxiliaries and additives to 100% by weight.

9. Composition according to claims 1 to 8, characterized in that they have a droplet size below 100 microns.

10. Use of temporary mixtures consisting of esterquats, alkyl and / or alkenyl oligoglycosides and alkylbenzenesulfonates as emulsifiers for the production of aqueous bleaching agents with a minimum content of 20% by weight of hydrogen peroxide, based on the non-aqueous portion.

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