Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
  • C08K5/098—Metal salts of carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/24—Macromolecular compounds
  • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B24/2641—Polyacrylates; Polymethacrylates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
  • C04B40/0039—Premixtures of ingredients
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
  • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
  • C08J3/05—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from solid polymers
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
  • C04B2103/0045—Polymers chosen for their physico-chemical characteristics
  • C04B2103/0057—Polymers chosen for their physico-chemical characteristics added as redispersable powders

Definitions

• the present invention relates to powders redispersible in water of film-forming polymers prepared from ethylenically unsaturated monomers, their preparation process and their use.
• Redispersible powders obtained by spraying and drying dispersions of acrylic film-forming polymers, and especially dispersions of polymers of vinyl esters, are already known.
• Film-forming polymers prepared from ethylenically unsaturated monomers are frequently used as adjuvants in compositions of hydraulic mineral binders to improve their processing and properties after hardening, such as adhesion to various substrates, sealing, flexibility. , mechanical properties.
• Redispersible powders have the advantage over aqueous dispersions of being able to be premixed with cement in the form of powdery compositions ready for use usable for example for the manufacture of mortars and concretes intended to be hung on construction materials, or for the manufacture of adhesive mortars or for the production of protective and decorative plasters inside or outside buildings.
• French patent FR-A-2 245 723 relates to a freeze-dried preparation, stable and dispersible in water containing a powder of a polymer latex and a water-soluble dispersing agent which is a saccharide.
• the object of the present invention is to provide a new pulverulent composition redispersible totally or almost completely in water, which is based on a film-forming polymer prepared from ethylenically unsaturated monomers.
• Another object of the present invention is to provide a redispersible powder of the above type which is stable on storage without agglomeration.
• Another object of the present invention is to provide a process for the preparation of the powders of the above type from latex of film-forming polymer.
• Another object of the present invention is to provide a redispersible powder of the above type which, in the form of a powder or after possible redispersion in water in the form of pseudo latex, can be used in all fields of application of latexes. make coatings (in particular paints, paper coating composition) or adhesive compositions (in particular pressure-sensitive adhesives, tile adhesives).
• Another object of the present invention is to provide a redispersible powder of the above type (or the pseudo-latex resulting therefrom) more particularly with a view to its use as additives to hydraulic binders of the mortar or concrete type.
• pulverulent composition which is redispersible in water obtained by mixing and then drying an emulsion of at least one film-forming polymer insoluble in water, of at least a main surfactant, of at least one water-soluble compound comprising:
• the invention also relates to a process for the preparation of such a pulverulent composition consisting in:
• aqueous emulsion consisting of a film-forming polymer insoluble in water prepared by polymerization in aqueous emulsion and comprising at least one main surfactant, at least one water-soluble compound and optionally at least one surfactant extra or an anti-caking agent,
• composition according to the invention has the advantage of spontaneously redispersing in water, to again give an emulsion having a particle size close to that of the initial emulsion.
• the invention firstly relates to a pulverulent composition redispersible in water obtained by mixing and then drying an emulsion of at least one film-forming polymer insoluble in water, of at least one main surfactant, of at least one water-soluble compound comprising: - an emulsion of at least one film-forming polymer insoluble in water and prepared from ethylenically unsaturated monomers,
• the binary phase diagram of water - surfactant includes an isotropic fluid phase at 25 ° C up to a concentration of at least 50% by weight of surfactant, followed by an ⁇ gide liquid crystal phase of hexagonal or cubic type at higher concentrations, stable at least up to the drying temperature,
• the water-insoluble film-forming polymers are prepared from ethylenically unsaturated monomers, in particular of vinyl and / or acrylate type.
• the water-insoluble film-forming polymers are preferably vinyl or acrylate homopolymers, or vinyl acetate, styrene / butadiene, styrene / acrylate, acrylate and styrene / butadiene / acrylate.
• the film-forming polymers preferably have a glass transition temperature of between about -20 ° C and + 50 ° C, preferably between 0 ° C and 40 ° C.
• These polymers can be prepared in a manner known per se by emulsion polymerization of ethylenically unsaturated monomers using polymerization initiators and in the presence of conventional emulsifiers and / or dispersants.
• the polymer content in the emulsion is generally between 30 and 70% by weight, more specifically between 35 and 65% by weight.
• vinyl esters and more particularly vinyl acetate alkyl acrylates and methacrylates in which the alkyl group contains from 1 to 10 carbon atoms, for example methyl, ethyl, n-butyl, 2-ethylhexyl acrylates and methacrylates; vinyl aromatic monomers, in particular styrene.
• These monomers can be copolyme ⁇ ses with each other or with other ethylenically unsaturated monomers.
• ethylene and olefins such as isobutene
• monomers vinyl aromatics such as methylstyrenes, vinyltoluenes
• vinyl halides such as vinyl chloride, vinylidene chloride, diolefins especially butadiene.
• the emulsion polymerization of the monomers is carried out in the presence of an emulsifier and of a polymerization initiator.
• the monomers used can be introduced as a mixture or separately and simultaneously into the reaction medium, either before the start of the polymerization in one go, or during the polymerization by successive fractions or continuously.
• an emulsifying agent use is generally made of the conventional anionic agents represented in particular by fatty acid salts, alkylsulfates, alkylsulfonates, alkylarylsulfates, alkyl arylsulfonates, arylsulfates, arylsulfonates, sulfosuccinates.
• alkali metal alkylphosphates, salts of abietic acid, hydrogenated or not They are used in an amount of 0.01 to 5% by weight relative to the total weight of the monomers
• the polymé ⁇ sation initiator emulsion which is water soluble is represented more particularly by hydroperoxides such as I hydrogen peroxide, cumene hydroperoxide, hydroperoxide diisopropylbe ⁇ zene, the para-menthane hydroperoxide, and by persulphates such as sodium persulfate potassium persulfate, ammonium persulfate. It is used in amounts of between 0.05 and 2% by weight relative to the total of the monomers.
• hydroperoxides such as I hydrogen peroxide, cumene hydroperoxide, hydroperoxide diisopropylbe ⁇ zene, the para-menthane hydroperoxide, and by persulphates such as sodium persulfate potassium persulfate, ammonium persulfate. It is used in amounts of between 0.05 and 2% by weight relative to the total of the monomers.
• a reducing agent such as sodium bisulfite or formaldehyde sulfoxylate, polyethyleneamine
• the reaction temperature is generally between 0 and 100 C C and preferably between 30 and 70 ° C.
• a transfer agent can be used in proportions ranging from 0 to 3% by weight relative to the monomer (s), generally chosen from mercaptans such as N-dodecylmercaptan, tertiododecylmercaptan, cyclohexene; halogenated hydrocarbons such as chloroform, bromoform, carbon tetrachloride. It makes it possible to adjust the proportion of grafted polymer and the length of the grafted molecular chains. It is added to the reaction medium either before the polymerization, or during polymerization.
• the film-forming polymer of the composition according to the invention has a weakly carboxylated surface and therefore a low surface acidity level. Thus, it preferably has a surface acidity level of at most 100 microequivalent of -COOH function per gram of polymer, preferably of at most 50 microequivalent of -COOH function per gram of polymer.
• the composition according to the invention also comprises at least one main surfactant, the binary phase diagram of water - surfactant comprises an isotropic phase which is fluid at 25 ° C. up to a concentration of at least 50% by weight of surfactant, followed by a rigid liquid crystal phase of hexagonal or cubic type at higher concentrations, stable at least up to the drying temperature.
• the binary phase diagram of water - surfactant comprises an isotropic phase which is fluid at 25 ° C. up to a concentration of at least 50% by weight of surfactant, followed by a rigid liquid crystal phase of hexagonal or cubic type at higher concentrations, stable at least up to the drying temperature.
• the rigid liquid crystal phase of the main surfactant is stable up to a temperature at least equal to 60 ° C.
• the rigid liquid crystal phase is stable up to a temperature at least equal to 55 ° C.
• the fluid isotropic phase can be poured, while the rigid liquid crystal phase cannot.
• the main surfactant can be of the nonionic or ionic type. According to a particular embodiment of the invention, said pnncipal surfactant is ionic.
• main surfactants using a binary phase diagram as described above are used and chosen from ionic glycolipid surfactants.
• ionic glycolipid surfactants derivatives of uronic acids are used more particularly.
• n an integer varying from 1 to 4.
• compounds of this type are in particular galacturo ⁇ ic, glucuronic, D-mannuronic, L-iduronic and L-guiuronic acids, without however being limited to these acids.
• the hydrocarbon chain of the surfactant which may or may not be substituted, is a saturated or unsaturated chain comprising from 6 to 24 carbon atoms and preferably from 8 to 16 carbon atoms.
• derivatives of galacturonic acid in the form of salts are used as main surfactants.
• hydroxyl group carried by the carbon bonded to the endocyclic oxygen is replaced by an OR group in which R represents an alkyl radical, linear or branched, having from 9 to 22 carbon atoms
• the counter ion of the salt of said surfactant is an alkali metal, an alkaline earth metal or else a quaternary ammonium group in which the radicals linked to the nitrogen atom, identical or different, are chosen from hydrogen or an alkyl or hydroxyalkyl radical having 1 to 6 carbon atoms.
• a main surfactant of amphoteric type is used
• amphoteric surfactants suitable for carrying out the invention more particularly have the following general formula
• R represents an alkyl or alkenyl radical comprising 7 to 22 carbon atoms
• Ri represents a hydrogen atom or an alkyl radical comprising 1 to 6 carbon atoms
• A represents a group (CO) or (OCH2CH2)
• n is 0 or 1
• x is 2 or 3
• y is 0 to 4
• Q represents a radical -R2 - COO M with R2 representing an alkyl radical comprising 1 to 6 carbon atoms
• M represents H, Na, K, NH4 and B represents H or Q
• surfactants of this type are used comprising at least two carboxylic groups.
• B represents the radical Q.
• the acid function of these compounds can be presented either in acid form, in salified form, partially or totally.
• these surfactants corresponding to the preceding formula use is more particularly made of amphoteric derivatives of alkyl polyamines such as Amphionic XL®, Mirataine H2C-HA® marketed by Rhône-Poulenc as well as Ampholac 7T / X® and Ampholac 7C / X® sold by Berol Nobel.
• the main surfactants which have just been described can be used alone.
• the pulverulent composition according to the invention also comprises at least one water-soluble compound. More particularly, this compound is a solid.
• the water-soluble compounds can in particular be chosen from mineral species such as the alkali or alkaline earth metal silicates, the alkali or alkaline earth metal phosphates, such as sodium hexametaphosphate.
• the most advantageous silicates in this type of application are those having a molar ratio SiO 2 / M 2 0 comp ⁇ s between 1, 6 and 3.5 with M representing a sodium or potassium atom.
• the water-soluble compounds can likewise be chosen from organic species such as urea, sugars and their derivatives.
• oses or monosaccharides
• osides highly depolymerized polyholosides.
• Compounds whose molecular weight by weight is more particularly less than 20,000 g / mol are understood.
• Aldoses such as glucose, mannose, galactose and ketoses such as fructose are examples of dares suitable for the present invention.
• Osides are compounds which result from the condensation, with elimination of water, of daring molecules between them or even of daring molecules with non-carbohydrate molecules.
• saccharide it is preferred holosides which are formed by the union of exclusively carbohydrate units, and more particularly oligosaccharides (or oligosaccharides) that comprise that a limited number of these units, that is to say a number in general below 10.
• oligoholosides that may be mentioned are sucrose, lactose, cellobiose, maltose.
• Suitable polyholosides that is to say compounds which are highly depolymerized and whose molecular weights by weight are more particularly less than 20,000 g / mole, are described for example in the work by P. ARNAUD entitled “ organic chemistry course ", GAUTHIER-VILLARS sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-sky-N-N-N-N-N-N-N
• dextran By way of nonlimiting example of highly depolymerized polyholosides, mention may be made of dextran, starch, xanthan gum and galactomannans such as guar or carob. These polysaccharides preferably have a melting point above 100 ° C. and a solubility in water of between 50 and 500 g / l.
• polyelectrolytes of organic nature resulting from the polymerization of monomers which have the following general formula:
• copolymers obtained from the monomers corresponding to the preceding general formula and those obtained using these monomers and other monomers in particular vinyl derivatives such as vinyl alcohols and vinyl amides such as than vinylpyrrolidinone.
• vinyl derivatives such as vinyl alcohols and vinyl amides
• peptide polymers derived from polyco ⁇ densation amino acids especially aspartic acid and glutamic acid or precursors of diamino diacids.
• These polymers can be homopolymers derived from aspartic or glutamic acid as well as copolymers derived from aspartic acid and glutamic acid in any proportions, or copolymers derived from aspartic acid and / or glutamic acid and d other amino acids.
• the copolymerizable amino acids include glycine, alanine, leucine, isoleucine, phenyl alanine, methionine, histidine, proline, lysine, ia serine, threonine, cysteine ...
• the preferred polyelectrolytes have a low degree of polymerization.
• the molecular weights by weight of these macromolecules are more particularly less than 20,000 g / mole and, preferably between 1,000 and 5,000 g / mole.
• the water-soluble compound is a main surfactant.
• composition of the present invention may further contain at least one additional ionic surfactant.
• the additional ionic surfactants can more particularly be amphoteric surfactants such as alkyl betaines, alkyldimethylbetaines, alkylamidopropylbétaines, alkylamidopropyl-diméthylbétaines, aJkyltrimethyl-sulfobetaines, imidazoline derivatives such as alkylamphoacetates, alkylamod alkylampho-propionates, alkytamphodi-propionates, alkylsultaines or alkylamidopropyl-hydroxysultaines, condensation products of fatty acids and protein hydrolysates.
• amphoteric surfactants such as alkyl betaines, alkyldimethylbetaines, alkylamidopropylbétaines, alkylamidopropyl-diméthylbétaines, aJkyltrimethyl-sulfobetaines, imidazoline derivatives such as al
• anionic surfactants such as the water-soluble salts of alkylsulphates, of alkylethersulphates, the alkylisethionates and the alkyltaurates or their salts, the alkylcarboxylates, the alkylsulphosuccinates or the alkylsuccinamates, the alkylsarcosinates, the alkyl derivatives.
• the cation is generally an alkali or alkaline earth metal, such as sodium, potassium, lithium, magnesium, or an ammonium group NR 4 + with R, identical or different, representing an alkyl radical substituted or not by a oxygen or nitrogen atom.
• the content of film-forming polymer powder is advantageously between 40 to 90 parts by weight in the pulverulent composition.
• the content of film-forming polymer powder is at least 50 parts, preferably at least 70 parts by weight.
• the amount of main surfactant is generally between 1 and 20 parts by weight in the pulverulent composition. Preferably, this content is between 2 and 10 parts by weight.
• the amount of water-soluble compound is generally between 7 and 50 parts by weight in the pulverulent composition. According to a particular variant, this quantity is between 8 and 25 parts by weight.
• the weight ratio of the concentrations between the main surfactant and the water-soluble compound is generally between 20/80 - 90/10. If they are identical, that is to say if the pulverulent composition according to the invention comprises at least one main surfactant also playing the role of water-soluble compound, the total amount of this compound corresponds of course to the sum of the two ranges mentioned above. In the case where the pulverulent composition of the invention comprises an additional surfactant, the weight ratio of the concentrations between the main surfactant and the additional surfactant is generally between 5 and 10.
• composition according to the invention can also comprise at least one mineral filler having a particle size of less than approximately 10 ⁇ m, preferably less than 3 ⁇ m.
• a filler chosen in particular from calcium carbonate, kaolin, barium sulphate, titanium oxide, talc, hydrated alumina, bentonite and silicon sulfoaluminate (white satin), silica.
• This mineral filler can be added directly to the pulverulent composition, or it can be obtained from the process for preparing the composition.
• the amount of mineral filler can be between 0.5 and 40, preferably from 2 to 20 parts by weight, per 100 parts of film-forming polymer powder insoluble in water.
• the pulverulent compositions obtained are stable on storage; they can be easily redispersed in water in the form of pseudo-latex and used directly in the form of powder or in the form of pseudo-latex in all known fields of application of latexes.
• the method consists of.
• aqueous emulsion consisting of a water-insoluble film-forming polymer in water prepared by aqueous emulsion polymerization and comprising at least one main surfactant, at least one hydrosoluble compound and optionally at least one surfactant additional or an anti-motta ⁇ t agent,
• the water in this emulsion is then removed and the product obtained sprayed to obtain a powder.
• the steps for removing water from the latex emulsion and obtaining a powder can be separate or concomitant. Thus, one can use a freezing process, followed by a sublimation step, or lyophilization, drying or spray drying (spraying - drying)
• Spray drying is the preferred method because it allows the powder to be obtained directly at the desired particle size without necessarily going through the grinding stage.
• the granulometry of the powder is generally less than 500 ⁇ m.
• Spray drying can be carried out in the usual manner in any known device such as for example an atomization tower associating a spraying carried out by a nozzle or a turbine with a stream of hot gas
• the inlet temperature of the hot gas (generally air), at the top of the column, is preferably between 100 and 115 ° C. and the outlet temperature is preferably between 55 and 65 ° C.
• the mineral filler can be added to the aqueous emulsion of starting polymer All or part of the mineral filler can also be introduced during the spraying step in the spray drying process. Finally, it is possible to add the mineral filler directly to the final powdery composition.
• the pulverulent compositions according to the invention are completely redispersible in water at room temperature by simple stirring.
• completely redispersible is meant a powder according to the invention which, after the addition of a suitable quantity of water, makes it possible to obtain a pseudo-latex whose particle size is substantially identical to the particle size of the latex particles present in the 'starting emulsion.
• the invention also relates to the pseudo-latex obtained by redispersion in water of a pulverulent composition as defined above.
• the invention relates to the use of the pulverulent compositions described above in the building industry as additives to mixtures of hydraulic mineral binders for the production of protective and decorative coatings, adhesive mortars and cements. adhesives for laying tiles and floor coverings. They are particularly suitable for the preparation of ready-to-use powdered products based on cement and plaster.
• the powder compositions of the invention or the pseudolatex derived therefrom can be used also in all other areas of application of latex, particularly in the field of adhesives, paper coating and paints.
• the pulverulent compositions according to the invention may also contain the usual additives, in particular biocides, microbiostats, Dacte ⁇ ostatician, and silicone and organic antifoams.
• composition% weight styrene / butadiene latex (*) 80 decyl D-galactoside sodium uronate (* * ) 10 water 10
• this latex has a dry extract of 50% and was obtained by emulsion polymerization of a weight mixture of 58% of styrene and 42% of butadiene. Its average particle size measured at BROOKHAVEN &. is 0.12 ⁇ m. Its surface is weakly carboxylated: it has a surface charge equal to 30 microequivalents of -COOH function / g of polymer.
• the binary water / surfactant phase diagram includes a fluid isotropic phase at 25 ° C up to a concentration of 60% by weight of surfactant followed by a liquid crystal phase of hexagonal type.
• This hexagonal phase has been identified and characterized by X-ray scattering at small angles, in accordance with the work by V. LUZZATI entitled "BIOLOGICAL MEMBRANES, PHYSICAL FACT AND FUNCTION", at from an aqueous solution containing 62% by weight of surfactant.
• the X-ray scattering spectrum at small angles contains two fine lines, the BRAGG spacings of which are in the ratios 1: 1 / (3) 1/2 .
• the mesh parameter obtained by measuring the line spacings is equal to 47 Angstroems.
• the particle size is between 10 and 100 ⁇ m
• composition by weight of the dry powder is as follows: styrene latex / butadiene 70% decyl D-galactoside sodium uronate 17% kaolin 12% water 1%
• the atomized product spontaneously redisperses in water at room temperature.
• the average particle size of the emulsion obtained, measured using a BROOKHAVEN® particle size analyzer. is 0.13 ⁇ m.
• composition% styrene / butadiene latex 77.5 alkyl polyaminocarboxylate (*) 22.5
• the alkyl polyaminocarboxylate is marketed under the name of AMPHIONIC XL by Rhône-Poulenc.
• This surfactant is in solution in water and has a dry extract equal to 40% by weight.
• the binary water / surfactant phase diagram includes an isotropic fluid phase at 25 ° C up to a concentration of 50% by weight of surfactant, followed by an optically isotropic viscous liquid crystal phase of cubic type. This phase has been identified and characterized by X-ray scattering at small angles in an aqueous solution containing 52% surfactant. The small angle X-ray scattering spectrum contains a series of five characteristic lines.
• the latex is the same as in Example 1.
• This mixture is atomized using a BUCHI® device with an inlet temperature of 110 ° C and an outlet temperature of 70 ° C.
• the powder obtained after atomization has a spontaneous dispersion in water.
• the pseudo-latex obtained has a particle size identical to that of the starting latex.
• the latex is the same as in Example 1.
• This mixture is atomized using a BUCHI® device with an inlet temperature of 110 C C and an outlet temperature of 70 ° C.
• the powder obtained after atomization displays spontaneous dispersion in water.
• the pseudo-latex obtained has a particle size identical to that of the starting latex.
• the sodium silicate has a SiO 2 / Na 2 O ratio equal to 2. It is in solution in water (dry extract equal to 45% by weight).
• the sodium silicate is mixed with the sodium decyl D-galactoside uronate and the urea, then the mixture is added to the styrene / butadiene latex, which makes it possible to have a fluid dispersion.
• This mixture is then atomized using a BUCHI® device with an inlet temperature of 110 ° C and an outlet temperature of 70 ° C.
• the powder obtained after atomization has a spontaneous dispersion in water.
• the pseudo-latex obtained has a particle size identical to that of the starting latex.
• the latex is the same as in Example 1.
• sodium hexametaphosphate is mixed with sodium decyl D-galactoside uronate and urea, then this mixture is added to the styrene / butadiene latex.
• This mixture is atomized using a BUCHI® device with an inlet temperature of 110 ° C and an outlet temperature of 70 ° C.
• the powder obtained after atomization has a spontaneous dispersion in water.
• the pseudo-latex obtained has a particle size identical to that of the starting latex.

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