ES2551384T3 - Composition of bicontinuous microemulsion detergent - Google Patents

Abstract

Bicontinuous microemulsion detergent composition, comprising: a 40-90% by weight of a surfactant system comprising: i 10-50% by weight of the surfactant system of a linear or branched fatty alcohol having 5-8 carbon atoms or a condensation product of a linear or branched fatty alcohol having 5-8 carbon atoms and containing no more than alkylene oxide groups and mixtures thereof; and ii an additional surfactant; and b 5-30% by weight of an aqueous solution comprising: i water; and ii an electrolyte, excluding the surfactant system (a) characterized in that the aqueous solution has an ionic strength of 0.1-4 mol / l; and c 5-30% by weight of an oil or solvent characterized by having i a Hansen solubility of between 14 and 20 (MPa) 0.5; and ii a solid trilaurine fat solubility in the oil of more than 3% by weight; and further characterized in that the viscosity of the composition is less than 1000 mPa.s (25ºC and 20 s-1).

Description

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DESCRIPTION

Composition of bicontinuous microemulsion detergent

5 Field of the invention

The present invention lies in the field of detergent compositions; in particular liquid detergent compositions with high active component content, for use in laundry and / or household cleaning among others. The compositions of the present invention refer to the field of microemulsions, in particular bicontinuous microemulsions.

Background of the invention

Liquid detergent compositions are widely appreciated and preferred by many consumers in the

15 news in both developed and developing and emerging markets. Such liquid detergent compositions are mainly used in laundry and household care applications.

One of the most common problems is the removal of grease stains and / or dirt, especially solid and solidified grease stains and / or dirt. This is a problem in the field of household cleaning (for example kitchen surfaces, dishwashing) and in the field of laundry and washing of textile materials (for example cuffs and necks).

Liquid detergent compositions are widely known in the art. Liquid detergent compositions generally comprise an active surfactant component and a solvent. The compositions of

Liquid detergent may further comprise perfume, adjuvant, polymers, bleach, thickeners, fluorescent agents and other common detergent components. Liquid detergent compositions are often structured, for example to control the viscosity of the liquid or to improve stability and prevent phase separation or to incorporate components that are insoluble in water.

One form of a stable liquid detergent composition is a detergent composition in the form of an emulsion. A defined emulsion class is the microemulsion. Generally emulsions are opaque liquids that are not appreciated by modern consumers. The microemulsions can be made transparent and also usually have a lower viscosity.

35 WO 95/27034 discloses detergent compositions in the form of oil-in-water microemulsions that provide rapid stain removal. The composition of WO 95/27034 comprises a surfactant system comprising non-ionic short chain length alcohol ethoxylates having less than 12 carbon atoms and with at least 45% C10 material. It is found that these oil-in-water microemulsions do not provide adequate dissolution of grease stains and dirt when applied pure. Rapid solubilization of the grease (or oily dirt) is still desired when pure is applied on a stain or grease dirt for, among other things, the sebum dissolution on shirt collars and grease soils on solid surfaces.

Microemulsions have also been disclosed in several other documents such as US.

45 5,415,812, which discloses a detergent composition for delicate clothing; or US 4,438,009, which discloses laundry pretreatment compositions with low solvent content.

Other pretreatment compositions have been proposed, primarily in the field of laundry and cleaning of textile materials, to provide stain removal.

US 4,561,991 discloses laundry pretreatment compositions in the form of microemulsions. It discloses mixtures of polyamines and solvents that cut the fat. Other surfactants such as non-ionic surfactants are also disclosed.

US 5,891,836 discloses a microemulsion composition that provides good fat cutting performance and which comprises alkyl ether sulfate surfactant, non-ionic surfactant, fatty acid amines and solvents.

What is still desired is a liquid detergent composition that removes dirt and / or stains of solid or solidified fatty material in the main wash at neutral pH.

An object of the present invention is to provide a composition that provides a rapid dissolution of solid fatty material.

Another object of the invention is to provide a stable concentrated detergent composition having up to 90% surfactant material.

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Another object of the invention is to provide a transparent concentrated detergent composition.

Another object of the invention is to provide a concentrated detergent composition that shows rapid dissolution in water.

Still another object of the invention is to provide a concentrated detergent composition having a low viscosity.

Still another object of the invention is to provide a liquid detergent composition that provides a rapid dissolution of oily / grease stains or dirt when applied pure.

Surprisingly, it has been found that a bicontinuous microemulsion detergent composition comprising a short chain non-ionic surfactant provides a liquid detergent composition

15 concentrate that removes dirt and / or stains of solid or solidified fatty material in the main wash at neutral pH.

Summary of the invention

Accordingly, the present invention provides a bicontinuous microemulsion detergent composition comprising 40-90% by weight of a surfactant system comprising: 10-50% by weight of the surfactant system of a linear or branched fatty alcohol which it has 5-8 carbon atoms or a condensation product of a linear or branched fatty alcohol having 5-8 carbon atoms and containing no more than 5 alkylene oxide groups and mixtures thereof and an additional surfactant, the 5 -30% by weight of an aqueous solution that

25 comprises: water and electrolyte; characterized in that the aqueous solution has an ionic strength of 0.1 -4 mol / l, 5-30% by weight of an oil or solvent characterized by having a Hansen solubility of between 14 and 20 (MPa) 0.5; and a solubility of solid trilaurin fat in the oil of more than 3% by weight; and further characterized in that the viscosity of the composition is less than 1000 mPa.s (25 ° C and 20 s-1).

In another aspect the invention provides a process for preparing a microemulsion according to any one of claims 1 to 9 which comprises the steps in sequence of: adding the surfactant system to an oil / solvent, mixing them together by means of a top stirrer, adding hydrophobic components optional, add an aqueous phase containing electrolytes.

35 Although the examples in this application predominantly show laundry applications, it is indicated that household cleaning applications, including hard surface cleaning applications, dishwashing, etc., are also included within the scope of this application. and conditioning applications of textile materials.

These and other aspects, features and advantages will be apparent to those of ordinary skill in the art from a reading of the following detailed description and the appended claims. For the avoidance of doubt, any feature of one aspect of the present invention can be used in any other aspect of the invention. The term "comprising" is intended to mean "including" but not necessarily "consisting of"

or "that is composed of." In other words, it is not necessary that the stages or options indicated are exhaustive. It is indicated that the examples provided in the description below are intended to clarify the invention and are not intended to

45 to limit the invention to those examples in themselves. Similarly, all percentages are weight / weight percentages unless otherwise indicated. Except in the operating and comparative examples, or when explicitly stated otherwise, it should be understood that all numbers in this description that indicate amounts of material or reaction conditions, physical properties of materials and / or use are modified by the word “ approximately". It is understood that the numerical intervals expressed in the format "from x to y" include x and y. When multiple preferred intervals are described for a specific characteristic in the "from x to y" format, it is understood that all intervals combining the different endpoints are also contemplated.

Detailed description

The invention relates to a bicontinuous microemulsion detergent composition.

BICONTINUOUS MICROEMULSION

A bicontinuous microemulsion has a microstructure of oil and water channels that extends through a sample (sample extension) as opposed to a differentiated droplet configuration as found in types of oil-in-water microemulsion (o / w ) and / or water in oil (w / o). These oil or water channels that extend through the sample interact with hydrophobic or hydrophilic soils, present on substrates, just as well and help faster solubilization of dirt / grime, especially stains or soils of solid grease or oil. These structures can be characterized by various known experimental techniques, including electrical conductivity, viscosity, light scattering, SAXD, SANS and

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NMR autodiffusion.

The oil-water interfacial tension is the lowest in this structure compared to microemulsions of type o / w or w / o. The viscosity of a bicontinuous microemulsion is normally greater than that of the corresponding type o / w or w / o 5 due to the channels that extend through the sample.

The bicontinuous microemulsion also has a greater ability to solubilize additional components in emulsions, compared to o / w and w / o microemulsions.

The bicontinuous microemulsions according to the invention are normally Newtonian liquids. Normally they do not have a pseudoplastic behavior.

Surfactant system

The compositions of the invention comprise from 40 to 90% by weight of the composition of a surfactant system, preferably at least 45% by weight, more preferably at least 50% by weight, or even at least 60% by weight. weight.

Compositions with high active component content even preferably comprise at least 50% by weight, more preferably at least 60% by weight or even at least 70% by weight of the surfactant system.

Other liquid laundry or textile cleaning compositions, textile material conditioning compositions and household cleaning compositions (for example dishwashing compositions) preferably comprise no more than 80% by weight, more preferably no more than 70 % in

25 weight, still more preferably not more than 60% by weight or even not more than 50% by weight.

The surfactant system of the compositions of the present invention comprises a linear or branched fatty alcohol or a condensation product of a linear or branched fatty alcohol and alkylene oxide (for example ethylene oxide and / or propylene oxide), preferably oxide ethylene (also known as fatty alcohol

30 ethoxylated or alcohol ethoxylate). The linear or branched fatty alcohol chain comprises from 5 to 8 carbon atoms. When the fatty alcohol is alkoxylated, the number of alkylene oxide groups is not more than 5, preferably it is between 1 and 4. Ethylene oxide (EO) groups are most preferred.

Linear or branched fatty alcohol, or alkoxylated fatty alcohol is present in the composition in a

Concentration from 10 to 50% by weight based on the surfactant system, preferably at least 15% or even at least 20% by weight based on the surfactant system, but preferably not more than 40%, more preferably not more than 35% or even not more than 30% by weight based on the surfactant system.

40 Additional surfactant

The surfactant system further comprises an additional surfactant. In general, surfactants can be chosen from the surfactants described in textbooks well known as "Surface Active Agents" vol. 1, by Schwartz & Perry, Interscience 1949, vol. 2 by Schwartz, Perry & Berch, Interscience 1958, and / or the current edition of

45 “McCutcheon’s Emulsifiers and Detergents” published by Manufacturing Confectioners Company or in “Tenside-Taschenbuch,” H. Stache, 2nd ed., Carl Hauser Verlag, 1981.

Such surfactants include anionic surfactants, cationic surfactants, nonionic surfactants, zwitterionic surfactants and / or amphoteric surfactants and mixtures thereof.

In laundry and textile cleaning compositions, anionic and non-ionic surfactants are most preferred, while any surfactant can be used in household cleaning compositions.

For dishwashing liquids, anionic and non-ionic surfactants, and combinations, are the most

55 preferred. For hard surface spray cleaners (spray and rub) any surfactant can be used.

Especially preferred are hard water tolerant surfactants, such as alkyl ether sulfates (eg SLES), alkoxylated nonionic surfactants, alkanolamides and AOS (alpha-olefin sulphonates).

60 OIL OR SOLVENT

The composition further comprises 5 to 30% by weight of an oil or a solvent characterized by having a Hansen solubility of between 14 and 20 (MPa) 0.5; and a solubility of solid triglyceride fat in the oil

65 and / or solvent of more than 3% by weight.

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Hansen's solubility is at least 15 (MPa) 0.5, more preferably at least 16 (MPa) 0.5 and usually no more than 19 (MPa) 0.5 or even no more than 18 (MPa) 0 ,5 .

Preferably, the solubility of solid trilaurine fat (a triglyceride) in the oil is more than 5%, or even more than 10%. This percentage is based on the aggregate amount of the oil and / or solvent and the trilaurin dissolved in it.

The oil is preferably selected from essential oils, fatty acid, mono, di and triglyceride oils, sugar derived polyesters and sucrose polyesters, and terpenes.

Preferred essential oils are essential oils derived from vegetable sources, for example citronella, orange peel, lemongrass oil, citrodora oil, neem (Azadirachta indica), etc. Preferred fatty acids are C8-22 fatty acids and including di and tricarboxylic acids and oligomeric fatty acids (such as those commercially available as Unichema Pripol 1017). Also preferred mono, di and triglycerides are contemplated.

15 including those of medium chain glycerides, which are liquid under ambient conditions. Preferred terpenes are limonene, eugenol and terpineol.

The solvent is preferably selected from alkyl esters of fatty acids and / or fatty alcohols preferably derived from renewable sources such as palm, coconut, soy, with C7-C22 fatty acid chain length distributions and alkyl chain length distributions 1-22 for the ester group.

Also included are combinations of any of the oils and / or solvents within the scope of this invention.

The melting point of said fatty acid ester is preferably less than 40 ° C, more preferably less than 25 ° C and most preferably less than 5 ° C.

When biodegradability is not a requirement, other solvents and oils that are considered are linear and / or branched alkanes.

WATERPROOF DISSOLUTION

The composition comprises 5-30% by weight of an aqueous solution, which has an ionic strength of from 0.1 to 4 mol / l, preferably at least 0.2 mol / l or at least 0.5 mol / l, but preferably not more than 3.5 mol / l, or even not more than 3 mol / l.

The aqueous composition comprises water and an electrolyte. The electrolyte is normally present in the composition in a concentration such that the ionic strength is in the range provided above. The electrolyte is normally present in a concentration of up to 15% by weight based on the aqueous solution, when the electrolyte is a monovalent electrolyte salt. The amount required depends on the type of electrolyte used and its valence.

Without wishing to restrict the theory, it is found that the electrolyte requirement follows the Schulze-Hardy rule for colloidal solutions, which defines the amount needed based on the required concentration of a monovalent electrolyte divided by (valence) 6; for example, when 15% NaCl is required to form a

45 microemulsion could be replaced by CaCl2 at a concentration of approximately 15% / 26 = 15% / 64 = 0.23%.

Preferably, monovalent electrolytes are present in a concentration of between 1 and 15% based on the aqueous solution.

Preferably, divalent electrolytes are present in a concentration of between 0.01 and 4% based on the aqueous solution.

Preferably, trivalent and multivalent electrolytes are present in a concentration between 0.005 and 55% based on the aqueous solution.

Preferred electrolytes are citrates, halides (preferably chlorides), phosphates, sulfates and sulphites of alkali metals and alkaline earth metals; Other suitable electrolytes are aluminum chloride and ferric chloride and mixtures of any of the above. Hydroxide salts are not preferred, due to unfavorable pH effects and undesirable reactions.

OPTIONAL COMPONENTS

The composition may further comprise adjuvant, anti-redeposition agents, mosquito repellents and / or

65 insects, shading dyes, antimicrobial agents (oil based), oil soluble bleach, oil soluble fluorescent agent, enzymes, perfumes and dirt release polymers.

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The bleach is preferably in the form of an organic peracid (for example PAP = phthalimidoperhexanoic acid) and is normally incorporated into the composition up to 10% by weight, preferably up to 8% by weight, more preferably up to 5% by weight; normally between 0.5 and 4%, or even between 1 and 1

5 2% by weight. The bleaching component preferably has a low water solubility (less than 200 ppm at 30 ° C), but high solubility (more than 0.5% by weight) in oil / solvent. The bleaching component is preferably solubilized in the oil / solvent phase of the bicontinuous microemulsion. The bleach component is expected to act on dirt during the interaction of oil droplets with the soiled substrates. When the bleach is incorporated, the pH of the composition is preferably acidic to neutral for stability reasons; the preferred pH is in the range of 5 to 7.

Mosquito repellent components such as citrodora oil, citronella oil, lemongrass oil and mixtures thereof can be incorporated up to 30% by weight. Mosquito repellency has been demonstrated in washed shirts with compositions containing at least 6% by weight of any one of the above agents and

15 mixtures thereof.

Perfume can be incorporated into the composition in a concentration of between 0.1 and 5% by weight. Normally the concentration is less than 3%, even less than 2%; Generally the perfume is present in a concentration between 0.5 and 1% by weight. It is shown that the perfume incorporated in a microemulsion provides up to 10 times better deposition on textile materials and the perfume remains for a longer period compared to only a surfactant solution containing an equivalent amount of perfume.

VISCOSITY

The viscosity of the composition is preferably low. By low means no more than 1000 mPa.s, more preferably not more than 500 mPa.s, preferably less than 300 mPa.s, still more preferably less than 200 mPa.s or even less than 150 mPa.s. It is preferred that the composition has a viscosity of more than 5 mPa.s, more preferably more than 10 mPa.s, still more preferably more than 20 mPa.s or even more than 50 mPa.s. All the mentioned viscosities are measured by a Carrimed CSL-100 viscometer with conventional cone and plate geometry, at 20 s-1 and 25 ° C.

pH

Preferably the pH is approximately neutral in a range of 5 to 9, preferably at least 6 and not more than 8. Any known pH adjusting buffer or agent can be used when required.

For compositions containing peach bleacher, the pH is preferably between 5 and 7.

PROCESS

The microemulsion is preferably carried out by sequentially adding the surfactant system to an oil / solvent, mixing them together by a superior stirrer, adding optional hydrophobic components such as fluorescent agent, essential oils / perfumes; adding an aqueous phase containing

45 electrolytes and adding enzymes / bleach.

Optional hydrophobic components include fluorescent agent, perfume and water-insoluble soil release polymers (e.g., Gerol, Rhodia trademark).

Components such as bleach, enzymes, water soluble dirt release polymers (sodium carboxymethyl cellulose) are usually only added to the composition after forming the microemulsion.

PRODUCT FORMAT

55 The product for washing clothes can be packaged in a conventional bottle. Precleaner stain cleaning products are normally loaded into a dispensing device, such as stain remover pencils, rolling ball applicators, brushes, and / or spray dispensers (e.g. trigger spray dispensers

or compressible bottles). Household cleaning products are normally in the form of trigger sprayers. Dishwashing liquids are usually sold in bottles.

The invention will now be illustrated by means of the following non-limiting examples:

Examples

The performance of the bicontinuous microemulsions of the present invention is compared with similar compositions that are not in the form of a microemulsion and with concentrated liquid detergent compositions.

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commercially available.

In the compositions, all concentrations are given by weight based on the total composition.

5 Example 1: Process of preparing a microemulsion detergent composition

Sodium LAS (linear sodium alkylbenzenesulfonate, Unilever) was mixed with ethoxylated alcohol (Imbentin OA / 030, CaEO3, 100%, clear liquid). Mixing was carried out by a high speed homogenizer (at 14000 rpm for 15 min). Sodium lauryl ether sulfate (3 EO) (SLES, Galaxy surfactants, Bombay, India) was added after

10 complete homogenization of the first two components. Water containing fluorescent agent, electrolytes (NaCl, Na2CO3, etc.) and dissolved enzymes was added to the mixer. Mixing was continued until a homogeneous suspension was obtained. D-Limonene oil / solvent (99%, Sigma) was added to the mixer at less RPM (2000). A transparent / translucent product of low viscosity was obtained. The working temperature was maintained at 25 ° C.

15 Two compositions (composition 1 and comparative composition A, see the table below) were prepared, according to the above method.

Component

Composition 1 (% by weight) Composition A (% by weight)

Na LAS

26 26

SLES

22 22

C8-EO3 *)

16

C9-11-EO3 *)

16

d-limponen

18 18

Water

16.8 16.8

NaCl

1.2 1.2

Composition

Clear, transparent microemulsion Liquid crystalline, opaque

Viscosity (mPa.s)

300 > 10,000

*) ethoxylated alcohol nonionic surfactant 20 Example 2: Cleaning performance (bulk washing)

Unsupported textile materials (cotton (C), polycotton (PC), polyester (PE)) of 10 by 10 cm were soiled by deposition of a mixture of trilaurin and carbon soot (1000: 1, homogenized by sonication) 25 in condition of heat (80 ° C) without using any solvent. 200 µl were applied per sample (10 per 10 cm)

The textile materials were soaked for 30 minutes in a washing liquid containing water and 1.2 g / l of microemulsion (composition 1) or the cleaning liquid of comparative composition A. The water hardness was 6 ° FH. The textile materials were then washed for 15 min in a tergotometer loaded with 300 ml at 25 ° C, at

30 90 rpm, liquid ratio: clothes = 30 and rinsed twice for 2 min in 6ºfH water. Then the samples were dried.

Before washing and after drying, the reflectance of the samples was measured using a Macbeth color eye spectrophotometer at a wavelength of 460 nm (UV exclusive SCI). The reflectance value is the percentage of light reflected at the indicated wavelength. Cleaning performance is measured in the difference (dR) between before and after washing (dR460 = After -Rare); The higher the value of dR the better the cleanliness.

6ºfH water cleaning performance:

Cleaning system

dR460 *

Cotton

Polycotton Polyester

Composition 1

20.5 14.9 twenty

Comparative composition A

10.6 eleven 3.7

The same experiments were repeated with 48ºfH water instead of 6ºfH water. 48ºfH water cleaning performance:

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Cleaning system

dR460 *

Cotton

Polycotton Polyester

Composition 1

16.4 19.9 16

Comparative composition A

11.9 12.7 6.5

Conclusion: The microemulsion cleaning performance of 1.2 g / l on soils, which contain solid fat, is superior to that of an equivalent surfactant solution. 5 Example 3: Cleaning performance (bulk washing) versus commercial product

A commercially available concentrated liquid detergent composition (comparative composition B, Persil Small & Mighty, Unilever, R.U.) was compared with the microemulsion of composition 1.

10

Comparative composition B

Concentration (% in w / w)

Nonionic alcohol ethoxylate (C12-15 EO7)

twenty

LAS acid

13

SLES-3EO

5

Fatty Acid (Prifac 5908)

4,5

Citric acid

one

NaOH

3

Monopropylene glycol

9

Glycerol

5

Triethanolamine

3

Minority components (perfume, fluorescent agent, enzymes, opacifier, sequestrant)

4

Water

Rest up to 100%

All concentrations are based on the total composition.

In order to be able to make a fair comparison between the concentrated microemulsion and the commercial product less

After concentrating, the samples were washed with a washing liquid containing 1.2 g / l of microemulsion (composition 1) or 2.0 g / l of the commercial product (comparative composition B) respectively.

Textile materials without soiling (C, PC and PE) were soiled as in Example 2.

20 The textile materials were soaked in the washing liquid containing the concentration of surfactant indicated above in water with a water hardness of 6 ° FH for 30 min. They were then washed for 15 min in a tergotometer loaded with 300 ml at 25 ° C, and 75 rpm. The samples were rinsed twice for 2 min in 6 ° FH water and dried.

25 The reflectance values were measured as in example 2

Cleaning system

dR460 *

Cotton

Polycotton Polyester

Composition 1

20.96 19.89 26.95

Comparative composition B

16.3 16.26 13.17

It is shown that the microemulsion has better performance than a commercial liquid detergent. Example 4: Perfume incorporation In this example perfume was incorporated into the microemulsion (composition 2) and compared with a liquid detergent composition that was not in microemulsion (comparative composition C).

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Component

Composition 2 (%) Composition C (%)

LAS of Na

9.9 9.9

SLES

8.5 8.5

C8-EO3 *)

eleven eleven

C12-EO7 *)

27 27

C12 fatty acid methyl ester

19

Water

19 38

NaCl

2.65 2.65

Fragrance

1.4 1.4

Fluorescent and enzyme agent

1.24 1.24

Composition

Clear, transparent microemulsion Liquid crystalline, opaque

Viscosity (mPa.s)

100 > 10,000

*) Non-ionic ethoxylated alcohol surfactant

The table above shows a microemulsion, compared to the same composition without oil / solvent, which is not a microemulsion.

The perfume deposited on the textile material was quantified by SPM-CG (gas chromatography by solid phase microextraction).

CG counts (peak area)

Composition 2 (x106) Composition C (x106)

After washing (wet)

14 1.5

1 day (dry)

1.35 0.9

3 days after drying

0.7 0.5

10 The table above shows that the effect of the microemulsion perfume is better than for a regular detergent (which is not in microemulsion).

Example 5: Mosquito Repellency

In this example, mosquito repellent (citrodora oil) was incorporated into the microemulsion (composition 3) and compared to the same composition without mosquito repellent, a liquid detergent composition that was not in microemulsion (comparative composition D).

Component

Comp. 4 (%) Comp. 5 (%) Comp. 6 (%) Comp. 7 (%)

LAS of Na

7.7 7.7 7.7 7.7

SLES

6.2 6.2 6.2 6.2

C8-EO3 *)

9.2 9.2 9.2 9.2

C12-EO7 *)

25.7 25.7 25.7 25.7

C12 fatty acid methyl ester

24.4 18.3 6.1

Citrodora

6.1 18.3 24.4

Water

24.4 24.4 24.4 24.4

NaCl

2.4 2.4 2.4 2.4

Composition

Microemulsion, clear, transparent Microemulsion, clear, transparent Microemulsion, clear, transparent Microemulsion, clear, transparent

Viscosity (mPa.s)

100 100 100 100

20 *) Ethoxylated alcohol non-ionic surfactant

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The table above shows a microemulsion, compared to the same composition without oil / solvent, which is not a microemulsion.

Mosquito repellency was tested by a panel of 4 volunteers. Each panel member wore a washed shirt with 2 g / l (see previous washing method) of any of the compositions in an area where there were many mosquitoes. The example was repeated twice (4 times 2 = 8 tests). The table below provides average values.

Component

Comp. 4 (%) Comp. 5 (%) Comp. 6 (%) Comp. 7 (%)

No mosquitoes approach

0 0 one 2

Few mosquitoes

0 2 one 0

Many mosquitoes

2 0 0 0

The table above shows that mosquito repellent is achieved by deposition of mosquito repellent through a microemulsion.

Claims (11)

1. A bicontinuous microemulsion detergent composition, comprising: 5 to 40-90% by weight of a surfactant system comprising: i 10-50% by weight of the surfactant system of a linear or branched fatty alcohol having 5-8 atoms carbon or a condensation product of a linear or branched fatty alcohol having 5-8 carbon atoms and containing no more than 5 alkylene oxide groups and mixtures thereof; and ii an additional surfactant; Y b 5-30% by weight of an aqueous solution comprising: water, and ii an electrolyte, excluding the surfactant system (a) characterized in that the aqueous solution has an ionic strength of 0.1 -4 mol / l; Y c 5-30% by weight of an oil or solvent characterized by having a Hansen solubility of between 14 and 20 (MPa) 0.5; and ii a solubility of solid trilaurine fat in the oil of more than 3% by weight; 25 and further characterized in that the viscosity of the composition is less than 1000 mPa.s (25 ° C and 20 s-1).

2.

Composition according to claim 1, wherein the alkylene oxide is ethylene oxide.

3.

Composition according to any one of the preceding claims, wherein the Hansen solubility is between 16 and 18 MPa0.5.

Four.

Composition according to any one of claims 1 to 3, wherein the oil is selected from oils

essential oils of fatty acids, mono, di and triglycerides, sugar-derived polyesters and sucrose polyesters, and terpenes and mixtures thereof.

5.

Composition according to any one of claims 1 to 3, wherein the solvent is selected from alkyl esters of fatty acids and / or fatty alcohols preferably derived from renewable sources such as palm, coconut, soy, with acid chain length distributions C7-C22 fatty acid and alkyl chain length distributions of 1-22 for the ester group and mixtures thereof.

6.

Composition according to any one of the preceding claims, wherein the pH of the composition is between 5 and 9.

Composition according to any one of the preceding claims, further comprising a mosquito repellent agent.

8.

Composition according to claim 7, wherein the mosquito repellent is selected from citrodora oil, citronella oil and lemongrass oil and mixtures thereof.

9.

Composition according to any one of the preceding claims, further comprising a perfume.

10.

Trigger spray dispenser comprising the composition according to any one of the

claims 1 to 9. 55

eleven.

Pre-spot cleaning device selected from stain remover pencils, rolling ball applicators and brushes, comprising the composition according to any one of claims 1 to 9.

12.

Process for preparing a microemulsion according to any one of claims 1 to 9, comprising the steps in sequence of:

to add the surfactant system to an oil / solvent, b mix them together using a top stirrer, 65 c add optional hydrophobic components eleven d add an aqueous phase containing electrolytes. 12