EP1381661A1

EP1381661A1 - Composition containing cellulose sulphoacetate and surfactant

Info

Publication number: EP1381661A1
Application number: EP02727695A
Authority: EP
Inventors: Etienne Fleury; Ian Harrison; Gaelle Royer; Jean-Louis Doublier; Luc Saulnier
Original assignee: Institut National de la Recherche Agronomique INRA; Rhodia Chimie SAS
Current assignee: Institut National de la Recherche Agronomique INRA; Rhodia Chimie SAS
Priority date: 2001-04-26
Filing date: 2002-04-25
Publication date: 2004-01-21
Also published as: FR2824069A1; FR2824069B1; WO2002088288A1

Abstract

The invention concerns a composition containing at least a cellulose sulphoacetate and/or at least one of its derivatives, and at least a surfactant. The invention also concerns the method for preparing said composition, in particular in gel form. The invention further concerns the use of said composition.

Description

COMPOSITION CONTAINING CELLULOSE SULFO-ACETATE AND SURFACTANT

The present invention relates to a composition which contains at least one cellulose sulfo-acetate and / or at least one of its derivatives, and at least one surfactant.

It also relates to the process for the preparation of said composition. It also relates to the use of this composition. Many industries incorporate surfactants into their formulations.

Surfactants are mainly used for their specific properties which make it possible to make dispersions, in particular emulsions or suspensions. Indeed, the surfactants are substances which lower the surface tension of the water or the medium in which they are dissolved. They can be fat-soluble or water-soluble. The rheology of formulations incorporating surfactants is of great interest to manufacturers. Indeed it is important to be able to incorporate surfactants as well in liquids, solids, as gels, according to the fields of applications.

The present invention relates in particular to gels of surfactants, which are very useful for manufacturers.

By gel is meant any type of system exhibiting a viscoelastic solid behavior over long periods of time (for example, beyond 100 s in a creep experiment or below 10 ^"2 Hz in harmonic regime). from a rheological point of view, this results in the presence of a plateau of G '(conservative module) and values of G' greater than G "(loss module), these two criteria being obtained at low frequency (in practice between 10 ^"3 and 10 ^{~ 2} Hz).

The known gelling methods for making surfactant gels notably use phase gelling. In these methods, the surfactants and electrolytes are mixed in previously optimized concentrations which cause a lamellar structure.

However, these methods are limited to lamellar structures and are unsatisfactory. Indeed, many problems arise during the preparation of these gels, in particular problems of compatibility of the media and problems of loss of viscosity of the gels obtained. In addition, when a formulation is sought in the form of a gel, incorporating surfactants, the known methods do not make it possible to obtain formulations which dissolve quickly in an aqueous medium. Another drawback is the limit in the choice of surfactants used in the composition of these gels. In fact, not all surfactants make it possible to obtain structured phases.

One of the problems which the invention proposes to solve is in particular to be able to provide gels which dissolve quickly in an aqueous medium.

In addition, another problem which the invention proposes to solve is notably to be able to supply gels incorporating large quantities of surfactants, and which dissolve quickly in an aqueous medium.

The invention further aims to provide gels of surfactants which are more particularly thermoreversible and thixotropic gels.

The term “thermoreversible” means a gel which forms after cooling and after having undergone a heat treatment beyond its melting point, and which has a melting point. This melting temperature is the temperature above which the gel melts. The term “thixotropy” is understood to mean the property of a gel losing its structure under the effect of a shearing force and, then, recovering all or part of its initial state after a certain period of rest.

Another object of the invention is to provide a simple and inexpensive process for the preparation of the compositions according to the invention. The object of the present invention is mainly to meet all of these requirements in a single formulation.

Other advantages and characteristics of the present invention will become apparent on reading the description and examples which follow.

The solution provided by the invention is to introduce the surfactants into an aqueous composition which contains at least one cellulose sulfoacetate and / or at least one of its derivatives.

Thus the subject of the present invention is an aqueous composition which contains at least one cellulose sulfo-acetate and / or at least one of its derivatives, and at least one surfactant. The invention also relates to the process for the preparation of said composition, in particular in the form of a gel having the desired properties.

It also relates to the use of this composition in various industrial fields.

The present invention will now be described in detail in these objects and other characteristics and with the aid of examples given purely by way of non-limiting illustration with reference to the appended figures in which: Figure 1 (1/1 and 2/1) shows the change in the apparent viscosity of the sulfo-cellulose acetate (15 g / l) / surfactant / water mixtures as a function of the amount of surfactant , figure n ° 2 represents the mechanical spectrum of mixtures sulfo-cellulose acetate (15 g / l) / surfactant (0 and 10 times the CMC / water for SDS and C12E8, figure n ° 3 (1 / 3 and 2/3) represents the evolution of the module G 'at 1 rad / s of the sulfo-cellulose acetate (15 g / l) / surfactant mixtures as a function of the amount of surfactant (spectrum a: tensio anionic active agents SDS and LABS; spectrum b: nonionic surfactant C12E8) The invention relates first of all to a composition which contains at least one cellulose sulfoacetate and / or at least one of its derivatives, and to the minus a surfactant.

This composition can be in the form of a gel.

The first essential constituent of the composition consists of at least one surfactant. The term "surfactants" means any substance which lowers the surface tension of the water or of the medium in which it is dissolved.

The surfactants used according to the invention can be ionic or nonionic, and can be used alone or in mixtures.

As ionic surfactants, non-limiting mention may be made of alkyl esters sulfonates, alkyl sulfates and their alkoxylated derivatives (in particular ethoxylated

(OE) and / or propoxylated (OP)), alkylamide sulfates and their alkoxylated derivatives

(in particular (OE) and / or (OP)), the salts of saturated or unsaturated fatty acids and / or their alkoxylated derivatives (in particular (OE) and / or (OP)), alkylbenzenesulfonates, primary or secondary alkylsulfonates, alkyl glycerol sulfonates, polycarboxylic acids sulfones, paraffin sulfonates, N-acyl N-alkyltaurates, alkylphosphates, isethionates, alkylsuccinamates, alkylsulfosuccinates, monoesters or diesters of sulfosuccinates, N-acyl sarcosinates, 'alkylglycosides, sophorolipids, such as those in particular in acid or lactone form and derivatives of 17-hydroxyoctadecenic acid. As examples of ionic surfactants, non-limiting mention may be made of anionic surfactants such as:

• the alkyl esters sulfonates of formula of the R-CH (Sθ3M) -COOR 'type, where R represents a Cβ-20 alkyl radical. preferably at C- | o-Cl6 'R' ^a C- - alkyl radical

CQ, preferably in C1-C3 and M an alkali cation (sodium, potassium, lithium), substituted or unsubstituted ammonium (methyl-, dimethyl-, trimethyl-, tetramethylammonium, dimethylpiperidinium ...) or derived from an alkanolamine

(monoethanolamine, diethanolamine, triethanolamine ...). Mention may very particularly be made of methyl ester sulfonates whose radical R is C14-C-16; • alkylsulphates of formula ROSOβM type wherein R represents an alkyl or hydroxyalkyl radical, C5-C24, preferably C- | 0 ^"c 18 ^'M representing a hydrogen atom or a cation with the same definition as above , as well as their alkoxylated derivatives (in particular (OE) and / or (OP)), having on average from 0.5 to 30 units, preferably from 0.5 to 10 OE and / or OP units;

• sulfated alkylamides in particular of formula of the RCONHROSO3M type where R represents a C2-C22 alkyl radical. preferably Cβ-C20. R 'a C2-C3 alkyl radical, M representing a hydrogen atom or a cation of the same definition as above, as well as their alkoxylated derivatives (in particular (OE) and / or (OP)), having on average of 0.5 to 60 OE and / or OP motifs;

• the salts of saturated or unsaturated fatty acids in particular and / or their alkoxylated derivatives (in particular (EO) and / or (OP)), in C8-C24, preferably in C14-C20, Cb-C20 alkylbenzenesulfonates _> ' es primary or secondary C8-C22 alkylsulfonates. alkyl glycerol sulfonates, paraffin sulfonates, N-acyl N-alkyltaurates, alkylphosphates, isethionates, alkylsuccinamates alkylsulfosuccinates, monoesters or diesters of sulfosuccinates, N-acyl sarcosinates, alkylglycoside sulfates; the cation being an alkali metal (sodium, potassium, lithium), a substituted or unsubstituted ammonium residue (methyl-, dimethyl-, trimethyl-, tetramethylammonium, dimethylpiperidinium ...) or derived from an alkanolamine (monoethanolamine, diethanolamine, triethanolamine ...);

By way of examples of ionic surfactants, non-limiting mention may be made of cationic surfactants such as:

• alkylammonium salts of formula of the type R1 R2R3R4N ⁺ X ^" where X ^" is a halogen ion, methylsulfate (CH ₃ SO ₄ ^~ ) or ethylsulfate (C ₂ H ₅ SO ₄ ), R1 and R2 are similar or different and represent an alkyl radical in CrC ₂₀ , a benzyl or alkylbenzyl radical in C ₁ -C ₄ , R3 and R4 are similar or different and represent an alkyl radical in CC ₂₀ , a benzyl or alkylbenzyl radical in Cι-C or an oxide condensate d ethylene and / or propylene (CH ₂ CH ₂ O) _x - (CH ₂ CHCH ₃ O) _y -H, where x and y range from 0 to 30 and are never zero together, such as methyl methyl bromide, alkylammonium halides, alkylpyrtdinium halides; quaternized triethanolamine diester;

N-methylimidazoline tallow methyl sulfate ester; di-hardened tallow-diethyl ammonium chloride (Arquad 2HT ®); • dialkyldimethylammonium chloride; alkylbenzyldimethylammonium chloride; By way of examples of ionic surfactants, non-limiting mention may be made of amphoteric and zwitterionic surfactants such as:

• alkyldimethylbetaines, alkylamidopropyldimethylbetaines, alkyltrimethylsulfobetaines, condensation products of fatty acids and protein hydrolysates.

As nonionic surfactants, non-limiting mention may be made of alkoxylated alkylphenols (in particular (EO) and / or (OP)), aliphatic alcohols more particularly of C ₈ -C ₂₂ , the products resulting from condensation ethylene oxide or propylene oxide with propylene glycol or ethylene glycol, the products resulting from the condensation of ethylene oxide or propylene oxide with ethylene diamine, alkoxylated fatty acids (especially (OE) and / or (OP)), alkoxylated fatty acid amides (especially (OE) and / or (OP)), alkoxylated amines (especially (OE) and / or (OP) )), alkoxylated amidoamines (in particular (OE) and / or (OP)), amine oxides, alkoxylated terpene hydrocarbons (in particular (OE) and / or (OP)), alkylpolyglycosides, amphiphilic polymers or oligomers .

By way of examples of nonionic surfactants, non-limiting mention may be made of surfactants such as:

• alkoxylated alkylphenols (in particular (OE) and / or (OP)), the alkyl substituent of which is in particular C6-C-12 and containing from 5 to 25 oxyalkylene units; by way of example, mention may be made TRITON ^® X-45, X-114, X-100 or X-102 sold by Rohm and Haas Cy. ;

• glucosamide, glucamide, glycerolamide;

• aliphatic alcohols, in particular C8-C22 and their alkoxylated derivatives (in particular (OE) and / or (OP)), containing from 1 to 25 units (OE) and / or (OP); by way of example, mention may be made of TERGITOL ^® 15-S-9, TERGITOL ^® 24-L-6 NMW sold by Union Carbide Corp., NEODOL ^® 45-9, NEODOL ^® 23-65, NEODOL ^® 45-7 , NEODOL ^® 45-4 marketed by Shell Chemical Cy., KYRO EOB ^® marketed by The Procter & Gamble Cy. ; • products resulting from the condensation of ethylene oxide, the compound resulting from the condensation of propylene oxide with propylene glycol, such as PLURONIC ^® marketed by BASF;

• products resulting from the condensation of ethylene oxide, the compound resulting from the condensation of propylene oxide with ethylenediamine, such as TETRONIC ^® marketed by BASF;

• amine oxides such as in particular alkyl oxides, more particularly ^C 10 ″ ^C 18 dimethylamines, C8-C22 alkoxy oxides ethyl dihydroxy ethylamines; • the alkylpolyglycosides in particular described in US-A-4,565,647;

• fatty acid amides, more particularly C8-C20

As for the nonionic amphiphilic polymers or oligomers entering into the composition according to the invention, they are more particularly chosen, alone or in mixtures, among the polymers, oligomers or copolymers at least partially miscible in the aqueous composition.

By amphiphilic polymers or oligomers is meant polymers or oligomers having a surface tension in an aqueous medium.

The amphiphilic polymers or oligomers can have a statistical distribution or a multiblock distribution.

By way of example of such amphiphilic polymers or oligomers, mention may in particular be made of polysaccharides having hydrophobic groups, in particular alkyl groups. Examples include guars.

Examples of amphiphilic polymers or oligomers can also be made of triblock polymers polyhydroxystearate - polyethylene glycol - polyhydroxystearate (products of Arlacel ^® range of ICI are an example), the hydrophobic polyacrylamides.

As regards non-ionic amphiphilic polymers more particularly alkoxylated (in particular (OE) and / or (OP)), the latter are more particularly chosen from polymers of which at least a part (at least 50% by weight) is miscible in water.

Examples of polymers of this type that may be mentioned, inter alia, are polyethylene glycol / polypropylene glycol / polyethylene glycol triblock polymers.

The preferred surfactants according to the invention are nonionic surfactants and anionic surfactants.

Mention may be made, as preferred nonionic surfactants, of alkoxylated fatty alcohols (EO and / or OP).

According to a preferred embodiment of the invention, the preferred surfactant is mono-n-dodecyl ether octaethylene glycol, alone or as a mixture. As preferred anionic surfactants, mention may be made of alkylbenzenesulfonates, in particular C ₉ -C ₂ o-

Mention may also be made, as preferred anionic surfactants, of sodium dodecyl sulfate or the sodium salt of dodecylbenzene sulfonic acid.

In the context of the present invention the concentration of nonionic surfactant in the composition is less than or equal to 150 times the critical micellar concentration of the surfactant, preferably less than or equal to 100 times the critical micellar concentration of the surfactant . As for the concentration of ionic surfactant, it is less than or equal to 10 times the critical micellar concentration.

The term “critical micellar concentration” (CMC) of a compound is understood to mean the concentration of this compound, in the medium, above which the compound micelles are formed in this medium. For concentrations lower than CMC, the surfactant molecules are free and for concentrations higher than CMC, an aggregation of these surfactant molecules appears to form micelles.

It should be noted that the critical micellar concentration can be determined by interfacial tension. In the case of ionic surfactants, the critical micelle concentration can also be determined by conductimetry.

The second essential constituent of the composition consists of at least one cellulose sulfo-acetate and / or at least one of its derivatives.

By cellulose sulfo-acetate derivatives is meant cellulose sulfo-butyrate or cellulose sulfo-aceto-butyrate or cellulose sulfo-propionate or cellulose sulfo-aceto-propionate.

These products, which are advantageously water-soluble, are well known to those skilled in the art and are prepared by esterification of a cellulosic compound.

The concentration of cellulose sulfo-acetate and / or one of its derivatives can be between 0.01% and 20%, preferably between 0.1% and 5%, more particularly between 0.5% and 3% in weight of the composition.

The second aspect of the present invention relates to the process for preparing the composition.

This process consists in contacting an aqueous phase, at least one surfactant and the cellulose sulfoacetate or one of its derivatives (step (i)).

Preferably, the preparation process is carried out by introducing, during step (i), into an aqueous phase the cellulose sulfoacetate or one of its derivatives, then at least one surfactant.

According to a variant of the invention in particular for preparing the composition according to the invention in the form of a gel, the preparation process can comprise a heat treatment step after step (i) where the temperature is between 30 ° C. and 140 ° C, advantageously between 60 ° C and 120 ° C.

According to another variant of the process according to the invention, the preparation process is implemented by introducing at least one surfactant into an aqueous phase containing the cellulose sulfoacetate or one of its derivatives having undergone this same heat treatment.

The duration of the heat treatment can vary from 1 minute to 6 hours, preferably from 15 minutes to 4 hours. At the end of the heat treatment, said solution obtained from step (i) can be cooled to a temperature between 0 ° C and room temperature (20 ° C - 25 ° C).

The purpose of this step is to structure the gel, when it is desired to obtain a gel.

Another aspect of the present invention relates to the use of the compositions in the fields of cosmetics, detergency, food, paper, agrochemicals, pharmaceuticals, dyes, drilling fluids.

In these fields, the compositions according to the invention, whatever their variants, can be used in formulations as a detergent agent.

The invention also extends to detergent formulations comprising compositions according to the invention.

The following examples illustrate the invention without, however, limiting its scope.

EXAMPLES

EXAMPLE 1 Preparation of Cellulose Sulfo Acetate or One of Its Derivatives

10 grams of Avicel cellulose are suspended in 200 ml of acetic acid and left under magnetic stirring for 30 minutes at room temperature. After filtration or centrifugation, the excess liquid is removed and the same operation is repeated twice.

The final filter cake is then immersed in 192 ml of acetic acid containing 1.32 ml of sulfuric acid. The whole is then stirred at room temperature for 1 minute, after which 19.1 ml of acetic anhydride are added. After stirring for 1 minute, the medium is heated at 40 ° C for 30 minutes. The reaction is stopped by adding 46 ml of a water / acetic acid mixture (15/30). Then, the medium is partially neutralized, at room temperature, by addition of sodium hydroxide. The polymer is isolated by precipitation or dialysis then lyophilization.

The product obtained is analyzed by gel permeation chromatography in the elution solvent Dimethyl acetate / LiCI (DMAc / UCI). The molar mass by weight measured is 80,000. The content of acetate function is obtained by prior saponification of the acetate functions, the degree of substitution for acetate function calculated is then equal to 2.5. The content of sulfate functions is estimated by the method described by Quemener et al. (Appl. Phycology, 9, p 179-188 1997). The degree of substitution according to sulfate is equal to 0.3 Example 2 Preparation of a Composition of Cellulose Sulfo Acetate and Surfactant and Appearance of the Mixtures

15 grams of cellulose sulfo-acetate are introduced into 1 liter of distilled water. The mixture is dispersed with stirring for 1 hour at 80 ° C and then left for 1 hour at room temperature. Then, the quantity of surfactants is introduced and the mixture is again stirred for 30 minutes then left to stand for 24 hours before the measurement.

Different experiments have been carried out with sodium dodecyl sulfate (SDS), the sodium salt of dodecylbenzene sulfonic acid (LABS) and mono-n-dodecyl ether octaethylene glycol (C12E8).

With SDS and LABS, a gel is obtained at 25 ° C. at a concentration of 10 × the critical micellar concentration of the surfactant. For C12E8, a gel is obtained at 25 ° C at a concentration of 100 x the critical micellar concentration of the surfactant

EXAMPLE 3 Rheological Properties of the Gels

The measurements are carried out using a rheometer (Rheometrics Fluid Spectrometer II, Piscataway, USA) and a "flat cone" measurement system. The sample undergoes a stress between the plane perpendicular to the axis of the cone, rotating at a certain speed Ω and the fixed cone of radius 25 mm. During the imposed deformation, the shear stress at any point of the air gap is given by σ = 3c / 3πr ³ and the shear speed by γ = Ω / α (with α = 0.0397 rad).

The flow curves are established over a range of shear rates from 100 to 0.025 s ^"1 .

Figure 1 (1/1 and 2/1) shows the evolution of the apparent viscosity of the sulfo-cellulose acetate (15 g / l) / surfactant / water mixtures as a function of the amount of surfactant.

The flow curves all exhibit marked shear thinning behavior and a Newtonian plateau at low shear rates. The apparent viscosity increases first with the concentration of surfactants up to an optimal concentration which depends on the nature of the surfactant. The viscosity then decreases but always remains greater than or equal to the apparent viscosity of the control gel containing no surfactant. The viscoelastic behavior of the mixtures has been studied. Figure 2 represents the mechanical spectrum of the sulfo-cellulose acetate (15 g / l) / surfactant (0 and 10 times the CMC / water for SDS and C12E8) mixtures.

Thus, in the absence of surfactant, the modules G 'and G "increase with frequency and G' is greater than G" which indicates that the system is structured (gel). In the presence of the surfactant SDS, G 'and G "are independent of the frequency up to a frequency of 0.1 rad / s then the modules increase with the frequency. For the two types of surfactants, G' is greater than G ". With the C12E8, the modules increase with frequency from 0.01 to 100 rad / s. Again, G 'is greater than G ".

These results indicate that the gel structure is preserved in the presence of surfactant whatever their nature.

The evolution of the module G 'at 1 rad / s for the SDS, LABS and C12E8 surfactants is given in FIG. 3 (1/3 and 2/3). In addition, the tan δ at 0.01 rad / s is reported in table 2.

These data indicate the more or less pronounced elastic nature of these gels and confirm that the mechanical properties of these gels are preserved, or even improved, compared to gels without surfactant.

Figure 3 (1/3 and 2/3) shows the evolution of the G 'module at 1 rad / s of the sulfo-cellulose acetate (15 g / l) / surfactant mixtures as a function of the quantity in surfactant (spectrum a: anionic surfactants SDS and LABS; spectrum b: nonionic surfactant C12E8)

Table n ° 2: Evolution of tan δ at 0.01 rad / s of cellulose sulfo-acetate gels (15 g / l), surfactant (nxCMC), water at 25 ° C.

Claims

1. An aqueous composition characterized in that it contains at least one cellulose sulfoacetate and / or at least one of its derivatives, and at least one surfactant.

2. Composition according to claim 1 characterized in that it is in the form of a gel.

3. Composition according to any one of claims 1 or 2 characterized in that the surfactant is chosen from ionic, nonionic surfactants, alone or as a mixture.

4. Composition according to claim 3 characterized in that the surfactant is ionic.

5. Composition according to any one of claims 3 or 4 characterized in that the ionic surfactant is chosen from alkyl esters sulfonates, alkyl sulfates as well as their alkoxylated derivatives (in particular ethoxylated (OE) and / or propoxylated (OP)) , alkylamide sulfates and their alkoxylated derivatives

(in particular (OE) and / or (OP)), the salts of saturated or unsaturated fatty acids and / or their alkoxylated derivatives (in particular (OE) and / or (OP)), alkylbenzenesulfonates, primary or secondary alkylsulfonates, alkyl glycerol sulfonates, polycarboxylic acids sulfones, paraffin sulfonates, N-acyl N-alkyltaurates, alkylphosphates, isethionates, alkylsuccinamates, alkylsulfosuccinates, monoesters or diesters of sulfosuccinates, N-acyl sarcosinates, 'alkylglycosides, sophorolipids.

6. Composition according to claim 3 characterized in that the surfactant is non-ionic.

7. Composition according to any one of claims 3 or 6 characterized in that the nonionic surfactant is chosen from alkoxylated alkylphenols (in particular (OE) and / or (OP)), aliphatic alcohols more particularly of C ₈ - C ₂₂ , the products resulting from the condensation of ethylene oxide or propylene oxide with propylene glycol or ethylene glycol, the products resulting from the condensation of ethylene oxide or l propylene oxide with ethylene diamine, alkoxylated fatty acids (in particular (OE) and / or (OP)), alkoxylated fatty acid amides (especially (OE) and / or (OP)), alkoxylated amines (especially (OE) and / or (OP)), alkoxylated amidoamines (especially (OE) and / or (OP)) , amine oxides, alkoxylated terpene hydrocarbons (in particular (OE) and / or (OP)), alkylpolyglycosides, amphiphilic polymers or oligomers.

8. Composition according to any one of claims 3 or 6 or 7 characterized in that the surfactant is mono-n-dodecyl ether octaethylene glycol.

9. Composition according to any one of claims 1 to 3 and 6 to 8 characterized in that the concentration of nonionic surfactant is less than or equal to 150 times the critical micellar concentration of the surfactant, preferably less than or equal to 100 times the critical micellar concentration of the surfactant.

10. Composition according to any one of claims 1 to 5 characterized in that the concentration of ionic surfactant is less than or equal to 10 times the critical micellar concentration of the surfactant.

11. Composition according to any one of claims 1 to 10 characterized in that the concentration of cellulose sulfo-acetate or one of its derivatives is between 0.01% and 20%, preferably between 0.1% and 5% , more particularly between 0.5% and 3% by weight of the composition.

12. Process for preparing the composition according to any one of claims 1 to 11, characterized in that this process consists in bringing an aqueous phase into contact, at least one surfactant and the cellulose sulfoacetate or one of its derivatives (step (i)).

13. Preparation process according to claim 12 characterized in that one introduces, during step (i), into an aqueous phase at least one surfactant and then the cellulose sulfoacetate or one of its derivatives.

14. Method according to one of claims 12 or 13 characterized in that a heat treatment is carried out at a temperature between 30 ° C and 140 ° C, advantageously between 60 ° C and 120 ° C, after step (i).

15. The method of claim 14 characterized in that the heat treatment is carried out for a period of 1 minute to 6 hours, preferably from 15 minutes to 4 hours.

16. Method according to any one of claims 12 to 15 characterized in that said solution from step (i) is cooled to a temperature between 0 ° C and room temperature.

17. Use of the composition according to any one of claims 1 to 11 in formulations intended for the fields of cosmetics, detergency, food, paper, agrochemistry, pharmaceuticals, dyes, drilling.

18. Detergent formulation comprising the composition according to one of claims 1 to 11.