CA2546107A1 - Use of an aqueous dispersion of at least one biodegradable polymer containing at least one stabilizing agent for the preparation of an aqueous filmogenic composition - Google Patents

Abstract

The invention relates to the use for the preparation of an aqueous film-forming composition of a dry matter of at least 35%, an aqueous dispersio composed of an organic phase dispersed in a dispersant aqueous phase, said dispersion containing, relative to its dry matter, from 9 to 99.5% by weight of organic phase comprising at least one biodegradable polymer, and from 0.5 to 6% of at least one stabilizing agent.

Description

USE OF AQUEOUS DISPERSION OF AT LEAST ONE POLYMER
BIODEGRADABLE CONTAINING AT LEAST ONE STABILIZING AGENT FOR
PREPARATION OF AQUEOUS FILMOGENIC COMPOSITION
The present invention relates to the use an aqueous dispersion of at least one polymer biodegradable material containing at least one stabilizing agent, for the preparation of a high aqueous film-forming composition dry matter.
The invention relates more particularly the use of the film-forming composition thus obtained for the preparation of aqueous adhesive compositions and aqueous pigment compositions.
For the purposes of the present invention, the term "Aqueous film-forming composition", a composition suitable for to form a film or a film by departure of the contained water initially in said composition.
By "aqueous adhesive composition" is meant a aqueous film-forming composition capable of adhering to a support or to create a joint between two other materials, whether of identical or different nature.
It may be in particular a composition of temporary protection of metal sheets, varnish for wood, an anti-graffiti composition, a waterproofing composition for walls, of a composition of textile finishing or gluing, of a composition coating of fertilizers, pharmaceutical products or seeds, or glue for leather, paper, wood, textile materials (woven or not), synthetic fibers, plastics, glasses and other materials.
Such aqueous adhesive compositions exhibit variable water contents, usually between 30 and 95 ~ of the total weight of these compositions.
Water acts as an inert solvent or dispersant constituents of these compositions and generally allows to adjust the viscosity and the rheology of these compositions to allow their easy application on the surface or

2 the material to be coated or glued, by coating, casting, spraying, soaking, immersion or by use of brushes, rolls, clichés or other instruments.
Such adhesive compositions include essentially binders and adjuvants, in the state solubilized in water or simply dispersed in water.
For the purposes of the invention, it is also understood "Aqueous pigment composition" means a composition film-forming agent in the form of an aqueous suspension pigments, binders and adjuvants.
It may be in particular sleeping sauces, aqueous paints and film-forming preparations aqueous pigments, such as for example glues loaded.
In paper applications, for example, a such an aqueous pigment composition is at the origin of the finished appearance of the paper (opaque, white, smooth and shiny) and is responsible for his printability and especially to color printing.
Water is an indispensable component of the pigmentary composition because it usually constitutes ~ and up to 95% of the total weight of said compositions pigmentary. She is the vector of all the others 25 elements.
The pigments constitute the solid charge of said aqueous pigment composition. They are usually calcium carbonate, sulphate calcium, barium sulfate, calcium sulfoaluminate, Kaolin, talc, titanium oxide or plastic pigments.
In the case of coating sauces, the pigments generally constitute 80 to 92% by weight of the material (MS) of the aqueous pigment composition and have generally for the purpose of covering the fibers of the paper or to give them a smoothness, to bring optics (whiteness, opacity, gloss) or properties

3 (in the case of bedding coating film).
In the case of paints and preparations aqueous pigment film-forming agents, the amounts of pigments generally represent from 10 to 95% by weight of dry matter of the aqueous pigment composition, and more generally 35 to 95 ~ by weight of the material dry, depending on the types of formulations used (paints matte, satiny or shiny).
Adjuvants are products auxiliaries present in the film-forming compositions aqueous, whether they are pigmentary or adhesive, small quantities.
These additives introduced represent generally from 0.3 to 5 ~, or even from 1 to 3 ~ by weight of the dry matter of said aqueous film-forming composition.
They are generally classified into three categories.
The first category corresponds to agents of formulation of alkaline agents type, dispersing agents (sodium hexametaphosphate, sodium polyacrylate), wetting agents, defoamers (mineral oils, products silicones, fatty acid esters, fatty amines), biocides (quaternary ammonium, phenols, aldehydes, dyes).
The second category confers on the said composition film-forming ability to behave properly on machines it these are rheology modifying agents (such as cellulosic compounds, polyurethane thickeners), water retainers (Carboxy Methyl Cellulose, starches and derivatives, caseins, proteins, polyols) or lubricants (calcium stearate, sulfonated oils, polyols).
It is indeed necessary that this film-forming composition water may be, in some cases, speed on machines (rate likely to be greater than 1500 m / min for paper machines).
The third category improves or to adjust the final characteristics of the composition aqueous film-forming it can be insolubilizers

4 (resins and crosslinking agents such as urea formaldehyde, melamine formalin, glyoxal, zirconium salt), brighteners optical (stilbene derivatives di, tetra or hexasulphonated), of coalescing agents or shading dyes (violet helium BNZ, blue uniperse).
The last constituent elements of the composition aqueous film former, whether pigmentary or adhesive, are the binders, which represent usually .
from 5 to 20% of the dry matter of the composition aqueous film-forming agent in the case of coating colors, from 5 to 90% of the dry matter of the composition aqueous film-forming agent in the case of film-forming preparations aqueous pigments, such as filled glues, - and from 5 to 65% of the dry matter of aqueous film-forming composition in the case of paints, depending on whether the paints are polished, satin or polished by.
Their role is to ensure the cohesion of the pigment layer, the film or the film, obtained from the water.
Their quantity is chosen with regard to the binding power the adhesive used, the nature of the pigment or pigments) possibly incorporated) and the concentration of aqueous film-forming composition.
The binders used are usually of origin natural, eg starch (wheat, corn), protein (casein), or of synthetic origin, eg latex or polyvinyl alcohol.
More particularly, a latex (or "Aqueous dispersion of polymer") which corresponds to a colloidal dispersion of synthetic polymers in a aqueous phase, ie a dispersion of microparticles of polymers in suspension in an aqueous phase, sometimes also called polymer suspension or emulsion.
The conventional manufacture of an aqueous dispersion of t synthetic polymers is mainly based on direct polymerization processes in emulsion of monomers synthetic.
This type of latex generally comprises particles of polymers synthesized by direct polymerization into

Emulsion pairs of monomers, for example type styrene / butadiene, styrene / butyl acrylate, methyl methacrylate / butadiene or vinyl acetate /
butyl acrylate.
Each of these monomers confers on the latex properties of.
- rigidity, gloss, absorption of inks (in the styrene, acrylonitrile, methacrylate methyl) - resistance to solvents and oils (with acrylonitrile) - resistance to aging by UV (with the methyl methacrylate, butyl acrylate, butadiene) - porosity (with vinyl acetate) - binding power, flexibility (with acrylate butyl, butadiene).
Generally a synthetic latex thus implemented in a film-forming composition has a dry matter from 45 to 60 ~, a density close to 1, a viscosity Brookfield from 100 to 300 mPa.s and a pH of between 4.5 and 8.
However, it is known to those skilled in the art that the major disadvantage of this type of aqueous dispersion of synthetic polymers, which limits its use, is the fact that these synthetic products are not biodegradable, neither compostable and are more difficult to recycle.
The absence of biodegradability poses serious environmental problems, especially during treatments waste by landfilling.
It was then proposed to use derivatives of starch as binders. However, if the starch is biodegradable, it has a lower binding power and is sensitive to water, which is particularly troublesome

6 for the application of the film-forming composition for example in multi-color offset printing where water is applied to each station, in water engravings or in flexographic inks.
In order to remedy this problem, dispersions aqueous polymers prepared from polymers biodegradable products were then researched and intensive development.
The term "biodegradable polymer" means a polymer able to be degraded under the action of microorganisms, soil microorganisms, but also under the action of natural agents, especially water.
Such aqueous dispersions of polymers biodegradable are known but can not be generally obtained only by the use of solvents volatile organic compounds such as, for example, described in JP patent application 10-101911 and US patent 5,747,584.
More particularly, in US Patent 5,747,584, the use of aqueous dispersions of biodegradable polymers of the PHA type to formulate adhesive dispersions suitable for bonding non woven.
However, such aqueous dispersions are always prepared using toluene, acetate of ethyl, acetone, halogenated solvents or other appropriate volatile organic solvents.
"Volatile organic compound" means any organic compound having a vapor pressure of 10 Pa or more at a temperature of 25 ° C or having a volatility corresponding under given conditions.
To the knowledge of the applicant company, it is However, to date, three types of process have been to have aqueous dispersions of at least one polymer biodegradable, devoid of volatile organic solvents.
The first type of process of the state of the art consists in the extrusion manufacturing of a dispersion

7 biodegradable polyester with high dry matter (DM) and very high viscosity.
The patent application EP 1.302.502 proposes in this regard a process of treating at high temperature and high pressure, by such an extrusion process, a mixture of biodegradable polyesters in the molten state with a aqueous emulsifier having a certain tension of surface and with certain additives, so as to obtain a aqueous dispersion having an MS of at least 40% and a viscosity of at least 1,000 mPa.s and preferably within between 1,500 and 10,000 mPa.s.
The process consists of melting the polyesters biodegradable in the extruder and then introduce the aqueous emulsifier downstream of the molten mixture. The mixture is then kneaded at a temperature below or equal to 100 ° C.
The patent application WO 97/49762 also describes a aqueous dispersion of biodegradable polymers capable of to be obtained by extrusion, which contains starches modified by esterification, dispersed in a phase aqueous, and a solvent-free process for producing said aqueous dispersions.
The process consists of preparing a mixture in phase melted at a temperature of 100 to 180 ° C of polymers and plasticizers, then to keep this mixture under stir at high temperature, before adding gradually water and dispersants.
The second type of state of the art process making available aqueous dispersions of at least a biodegradable polymer, devoid of solvents volatile organic compounds, is that proposed by the company Applicant, and consists of aqueous dispersions of less a biodegradable polymer constituted by a phase organic dispersed in a dispersing aqueous phase and free of volatile organic compounds, whose phase dispersed organic compound comprises at least one reducing agent viscosity.

8 These aqueous dispersions of at least one polymer biodegradable have been the subject of a non-patent still examined, filed in France by the company Applicant on September 12, 2003.
These aqueous dispersions of at least one polymer biodegradable contain a viscosity reducing agent having particular characteristics in terms of parameter of solubility and ability to form hydrogen bonds, used in a weight ratio specific with said biodegradable polymer.
The viscosity reducing agent (or "plasticizer") here is a heavy organic compound preferably biodegradable or compostable, which, incorporated into polymers, at least partially destroys the interactions between chains responsible for the high viscosity and the mechanical cohesion of said polymers.
Moreover, the absence of volatile organic compounds in these aqueous dispersions results in a content of volatile organic compound (or VOC) that does not exceed ingredients of said aqueous dispersions, ie at most equal to 5,000 ppm, preferably not more than 1,000 ppm, and more preferably still at most 500 ppm.
The third type of process of the state of the technique makes it possible to obtain dispersions directly of at least one biodegradable bacterial polymer of polyhydroxyalkanoate type, stability ~ variable, from of microorganisms containing it.
This process can lead to obtaining dispersions aqueous biodegradable polymers without solvents volatile organic substances when it is based on the extraction by cell lysis followed by purification by lanes chemical or enzymatic polymer native granules biodegradable.
A. DUFRESNE and E. SAMAIN in Macromolecules, 1998, 31, 6426-6433 describe the production of aqueous dispersions of stable poly ((3-hydroxyoctanoate) or PHO from

9 microbial strains of Pseudomonas oleovorans. The production takes place by fermentation under pH conditions controlled, and the extraction of the aqueous dispersion of PHO
is carried out using sodium hypochlorite.
The spontaneous stability of these aqueous dispersions of PHO is explained by the persistence around the granules of polymers in suspension of residues of a protein particular, in this case here the murein sacculus.
This type of process is also known for obtaining aqueous dispersions of polymers biodegradable of microbial origin other than PHO, as for example hydroxy-valerate copolymers and hydroxybutyrate (PHBV).
The use of aqueous dispersions of biodegradable polymers, free of organic solvents volatile, as binders in film-forming compositions aqueous solutions, has mainly been developed in the state of the with these aqueous polymer dispersions biodegradable isolated from microbial strains.
Patent application WO 91 / 13,207 describes in fact aqueous dispersions comprising a colloidal suspension in the water of essentially amorphous particles of a polymer or a copolymer of (3-hydroxyalkanoates) for example i-hydroxybutyrate and (3-hydroxyvalerate), extracted in particular from the biomass of Alcaligenes eutrophus or Pseudomonas oleovorans and its use for produce self-supporting films or papers biodegradable.
This patent describes the possibility of disposing of latex from microorganisms that possess the characteristics necessary for their use as binding agents for pigmentary compositions, and which have the advantage of lead to coated papers or coating films biodegradable and recyclable.
However, the binding properties of the latexes described in this patent application are only carried by a only family of polyhydroxyalkanoates whose chains side include 1 to 12 carbon atoms.
Moreover, if these latexes are in the state native in the form of essentially wet granules 5 amorphous, they have the disadvantage of getting organized in a very crystalline state, especially when dried and / or after deposit on a support.
However, this ability to crystallize these latexes do not intend to be properly implemented in

10 applications where it is essential on the one hand, to promote the coalescence of the particles of the emulsion, and on the other hand to obtain dried films with adequate mechanical and optical properties.
The film formation of the aqueous dispersions of polymers requires that a perfect result be obtained interpenetration / fusion of polymer particles dispersed after evaporation of water (phenomenon of "Coalescence").
For some applications in coating coatings, coating films or paints, it is therefore essential to maintain the latex in a non-crystalline state in order to favor said melting of the particles on the surface of the support and to obtain mechanical and optical properties similar to those usually obtained with latex synthetic polymers not biodegradable or difficult recyclable.
It is therefore necessary, and that is what is besides recommended in the patent application WO
91 / 13.207, for preparing the pigment compositions, to improve the properties of this bacterial latex using surfactants, soap or detergent, so precisely to limit the effects of latex crystallization induced by heat.
As a result, the pigment compositions described in this international patent application, because of the ability of the biodegradable polymer to crystallize strongly after deposit on a support, do not appear in

11 practical adapted to the use in the fields applications covered by the present invention of the Applicant company.
Moreover, in this patent application international law, only the possible use of latex having a solids content of 15 to 30% for film formation, which is a particularly handicapping penalizing in terms of drying speed and cadence on industrial machinery.
It is described that after evaporation of the water of the latex at room temperature, however, it is possible to obtain a dense and transparent film, with the qualities slightly improved, thanks to the use of halogenated chloroform solvents and / or by exposure to the vapors of these solvents at the time of drying the film.
Mandatory use of volatile organic solvents constitutes a second serious handicap to the application of this process.
In US Patent 6,024,784, it is described the use of poly (3-hydroxyalkanoates) having mono or polyunsaturated side chains of 6 to 16 atoms of carbon extracts of Pseudomonas fluorescens, as binders in pigment compositions for preparation of paintings.
However, although biodegradable polymers can be presented in all general terms in the form of latex, US Patent 6,024,784 does not envisage experimentally in fact that the use of organic solutions of poly 3 hydroxyalacanoates (PHA) for the preparation of paints Solvent.
Organic solvents of the petroleum ether type, diethyl ether or chloroform, aromatic solvents toluene or xylene type, or else aliphatic solvents are recommended to solubilize the PHA before use as a binder.

12 This technical solution does not therefore satisfy the environmental requirements, because only proposed solventborne paint formulations.
From all the above, it follows that there is a unmet need to have a composition film-forming agent containing an aqueous dispersion of at least one biodegradable polymer, preferentially free from all volatile organic compounds, with high dry matter, may only include biodegradable ingredients and easily used for the preparation of compositions aqueous film formers, whether they are pigmentary or adhesives such as coating sauces; prep ~ atations aqueous pigment film-forming agents, glues, or paints water, without the need to implement heavy, difficult and complex steps.
The Applicant Company had the merit of reconciling all these objectives, which until then were hardly known reconcilable by proposing the use of an aqueous dispersion at least one biodegradable polymer containing at least one stabilizing agent present in a sufficient amount but not excessive, for the manufacture of such compositions film.
The present invention thus relates to use, for the preparation of a composition aqueous film-forming agent of a dry matter at least equal to ~, an aqueous dispersion composed of a phase organic dispersed in a dispersant aqueous phase, said dispersion containing in relation to its material dry.
From 94 to 99.5% by dry phase of organic phase comprising at least one biodegradable polymer, and from 0.5 to 6% of at least one stabilizing agent.
According to a particular embodiment of the invention, the dispersion used for the preparation of an aqueous film-forming composition of a dry substance less than 30 ° s, contains in relation to its material dry.

13 - from 95 to 99.5 ~ in dry organic phase comprising at least one biodegradable polymer, and from 0.5 to 5% of at least one stabilizing agent.
Preferably, the present invention relates to the use of an aqueous dispersion as defined previously for the preparation of a composition aqueous film-forming agent having a dry matter, at least equal to 35 ~ by dry weight, preferably between 45 and 99.9% by weight on dry basis, and more preferably still between 50 and 75% by weight on a dry basis.
It is the merit of the applicant company of propose to use this aqueous dispersion having a such a wealth of biodegradable polymers for the preparation of high aqueous film-forming compositions dry matter.
As has been established above, the dry matter, in the case of aqueous pigment compositions classics, is brought mainly by pigments, complemented by binders and of lesser importance by adjuvants.
The Applicant Company has thus overcome the prejudices technique according to which it is all the more difficult, even impossible, to prepare a film-forming composition stable aqueous solution, whether pigmentary or adhesive, from an aqueous dispersion of at least one polymer biodegradable, that the dry matter content of the said film-forming composition is high.
Indeed, the aqueous dispersions of at least one biodegradable polymer of the state of the art usually too high viscosity.
As a result, in high dry matter, it is the case of aqueous pigment compositions, strong interactions between the pigments and the components of the aqueous dispersion.
Strong interactions can then cause phase inversions that lead to breaking the homogeneity

14 of the pigment composition while increasing considerably viscosity.
This increase in viscosity becomes so strong that it renders the pigment composition unsuitable for use in coating sauces, in film-forming preparations aqueous pigment or in aqueous paints.
To avoid this phenomenon of phase inversion, it is merit of the Applicant company to have found that it required the presence of a stabilizing agent in the aqueous dispersion constitutive of the composition film-forming, in an appropriate amount, sufficient but not excessive, so as not to interfere with the good coalescence of particles of dispersed organic phase.
These stabilizing agents can be proteins, starches, polyvinyl alcohols, gums, celluloses and polyols, in native or modified form, taken alone or in combination.
These stabilizing agents can also be polymeric emulsifiers such as, for example, high molecular weight crosslinked acrylic copolymers comprising a hydrophobic comonomer, and in particular a cross-linked copolymer of acrylic acid and methacrylates alkyl radicals of 10 to 30 carbon atoms (such as PEMULEN ~ marketed by the company NOVEON).
Stabilizing agents are preferably polyvinyl alcohols of degree of hydrolysis between 60 and 98 ~, preferably 70 to 90%, of the gum arabic, xanthan gum, starches or celluloses modified, preferably esterified (methylated, carboxymethylated, acetylated or alkyl succinylated) or etherified (cationic or hydroxypropylenes).
These stabilizing agents must be present in the aqueous dispersion in a proportion of between 0.5 to 6 ~ in dry weight, preferably between 1 to 5.5 ~ in dry weight, e ~ more preferably between 0.5 and 5 ~ and very preferably between 1.5 and 5 ~ in dry weight of the dry matter of said aqueous dispersion.

It is then possible to incorporate from 94 to 99.5 ~, preferably 95 to 99%, of polymers) biodegradable) in said aqueous dispersion, which makes it possible to obtain a aqueous dispersion of a richness never before reached For the preparation of the aqueous film-forming composition according to the invention.
The Applicant Company has indeed found that levels of stabilizing agents below 0.5 ~, the aqueous dispersion does not have sufficient stability To be incorporated as a binder in a composition aqueous film-forming agent with a high dry matter content.
At contents greater than 5 ~, the content too high in stabilizing agents is detrimental to coalescence properties necessary for manufacture by

Example of coating sauces, film-forming preparations aqueous pigments, aqueous paints or aqueous adhesive compositions.
The aqueous film-forming composition conforms to the invention is also characterized by the fact that 2 0 both in its content and in its implementation, it is preferably obtained by using a dispersion aqueous free of volatile organic solvents.
The absence of volatile organic compounds in this aqueous film-forming composition results in a content of VOC that does not exceed that of the ingredients of said aqueous film-forming composition, ie at most equal to 15,000 ppm, preferably at most 5,000 ppm, and more preferably still at most 1000 ppm.
The aqueous film-forming composition conforms to the invention therefore has none of the disadvantages of preparations of the prior art, and thus allows to escape to the problems of toxicity, additional costs, complexity of implemented, the obligation to install leak prevention devices, devices anti-flash or solvent recovery volatile organic compounds and their inevitable impact on the environment.

16 The Applicant Company found that the choice of the type aqueous dispersion without organic solvents volatiles is not a limiting factor, which in itself is remarkable.
Each of the known types of process for obtaining the aqueous dispersions of at least one biodegradable polymer described above, may therefore be suitable.
Indeed, it is by the choice of a stabilizing agent given, in given proportions, that it is permitted to incorporate all types of biodegradable polymer into said aqueous dispersion.
The applicant company only recommends the use of aqueous dispersions comprising from 0.5 to 6% by weight of at least one stabilizing agent with respect to dry weight of said aqueous dispersion, for the preparation aqueous film-forming compositions of high dry matter.
Advantageously, the applicant company recommends choosing more specifically two families aqueous dispersions consisting of an organic phase dispersed in a dispersant aqueous phase devoid of volatile organic compounds for the preparation of aqueous film-forming composition with high dry matter according to the invention.
The first family corresponds to dispersions aqueous solutions developed by the company Applicant, comprising in their organic phase.
at least one viscosity reducing agent having a solubility parameter between 15 and 28 (J. cm s ~ o, s, preferably between 16 and 23 (J. cm 3) o, s ~ more preferentially still between 18 and 21 (J. cm 3) o, s ~
and a hydrogen bonding parameter 8H between 3.5 and 15 (J. cm 3) 0, s, and preferably between 4 and 13 (J.cni3) o, s, and more preferably still between 5 and 10 (J.cnl3) o, s, and - at least one biodegradable polymer in a ratio Polymeric weight reduction agent viscosity reducing agent 99.8 / 0.2

17 at 60/40, preferably between 97/3 to 70/30, more preferably between 92/8 and 70/30.
These aqueous dispersions have a low viscosity even at high dry matter, so that they particularly suitable for the preparation of pigment compositions with a high solids content the invention.
The applicant company recommends choosing the agent viscosity reducer in the group of acid esters and alcohols, optionally ethoxylated, preferably mono-, di- or tri-esters of organic acids, acid carbonic acid and phosphoric acid, sugars or polyols.
It can also be chosen from the group of optionally ethoxylated ethers of sugars, polyols (including isosorbide), glycol or phenol, ether-esters of glycols or triglyceride oils epoxidized.
It is desirable to choose it biodegradable or compostable and food grade.
The viscosity reducing agent also has advantageously a boiling point greater than 130.degree.
preferably greater than 150 ° C and more preferably still above 200 ° C, which places it in the category heavy solvents particularly well adapted to their function.
The applicant company recommends in particular that choose the viscosity reducing agent in the group consisting of glycerol triacetate, diacetate isosorbide, isosorbide dibutylate, di-isobutylate isosorbide, isosorbide dioctanoate, dimethyl isosorbide, ethyl lactate, butyl lactate, tributyl citrate, triethyl citrate, bis (2 ethyl) hexyl) adipate, diisobutyladipate, dibutyl phthalate, propionic acid, glycerol tributyrate, glycerol triisobutyrate, ethylene glycol dibenzoate, diethylene glycol dibenzoate, propylene glycol

18 dibenzoate, dipropylene glycol dibenzoate, sorting ethylene glycol benzoate, dibutyl sebacate, diisobutyl sebacate, propylene carbonate, poly ethylene glycol 400, polyethylene glycol 600, caprolactone diols of molecular weight close to 500, the methyl esters of vegetable oil and esters dibasic adipic acid, succinic and / or glucaric acid.
The biodegradable polymer is not crystallizable, and is selected from the group consisting of biodegradable polymers of the polylactate (or PLA) type, polymalates (or PMA), polyhydroxyalkanoates (or PHA), polycaprolactone (or PCL), polyesteramides (PEA), aliphatic copolyesters (PBSA) and copolyesters aliphatic co-teratephatalates (PBAT), celluloses or starches highly acetylated or hydrophobicized by introduction of fixed fatty chains, taken alone or combination, as homopolymers, of heteropolymers, they are linear, branched, crosslinked, dendritic or grafted.
Advantageously, the biodegradable polymers are heteropolymers, preferably di-, tri- or tetra-polymers, the monomers of which are diols, caprolactones or acids and hydroxy acids selected in the group consisting of D-lactic acid, lactic acid, glycolic, tetramethylglycolic, malic, (3 propiolactic, butyric, valeric, phthalic, terephthalic, succinic, adipic, sebacic, hexanoic, octanoic, decanoic, dodecanoic, tetradecanoic, hexadecanoic and octadecanoic.
For heteropolymers, the applicant company recommends selecting at least two monomers polymerize so that the first is solid to room temperature, and the second most fluid at this temperature. In this case, aqueous dispersions are obtained well suited to film formation.

19 The biodegradable polymers may be random heteropolymers, alternating, sequenced or blocks.
The applicant company has shown that the aptitude of the polymers to strongly crystallize was not recommended for aqueous dispersions intended for the preparation of aqueous film-forming compositions.
It is therefore advantageous to retain a polymer biodegradable occurring in said dispersions under non-crystallizable form, ie in amorphous form or under semicrystalline form, and preferentially in the form amorphous.
The applicant company recommends that maintain said polymer in amorphous or semi-solid form after application and / or drying on a support.
For the purposes of the invention, the "amorphous" form of biodegradable polymer contains at most 25% polymers in crystallized form. The "semi-crystalline" form contains not more than 60% of polymers in crystalline form.
Optionally, a polymer is chosen functionalized biodegradable, preferably by a aldehyde group, fluorinated group, carboxylic acid, amine and alcohol.
The Applicant Company has finally found that amorphous or semi-crystalline biodegradable polymers, type PHA proposed in particular by the company PROCTER & GAMBLE
under the brand name NODAX ~, and polymers biodegradable PLA type proposed in particular by the GALACTIC company under the brand name GALASTIC ~ L68, were particularly suitable.
In particular, it is possible to use a mixture of NODAX ~
with amorphous or semi-crystalline PLA and / or starches strongly acetylated or rendered totally hydrophobic.
To prepare the aqueous dispersion suitable as binding agent of the aqueous film-forming composition according to the invention, the presence of a given stabilizing agent in particular proportions, is necessary.
This goal is easily achieved here by the succession of the following steps which consist of:
1) prepare the organic phase to disperse the aqueous dispersion by melting the mixture of biodegradable polymer and viscosity reducing agent, a temperature above the transition temperature vitreous of the biodegradable polymer so as to obtain a Homogeneous melt blend, the ratio of polymer biodegradable and viscosity reducing agent being included between 99.8 / 0.2 to 60/40, preferably between 97/3 to 70/30, more preferably between 92/8 and 70/30, 2) completely solubilize at least one agent Stabilizer in the aqueous dispersant phase so as to what it represents 0.5 to 6%, preferably 0.5 to 5%, in dry weight of the dry matter of the aqueous dispersion, 3) Simultaneously and continuously introduce the dispersant aqueous phase and the organic phase to be dispersed

Thus obtained in the mixer of an emulsifier group, in having previously settled the charges for the introduction of two phases so that the organic phase dispersed represents at least 80 ~ by weight of the material drying said aqueous dispersions, preferentially at least 90 ~ by weight, more preferably still at least 95% by weight, and 4) recover the aqueous dispersions thus obtained.
For the preparation of said aqueous dispersions, uses an emulsifier group, for example a group emulsifier as one of those marketed by society EMULBITUME (Trégueux - France) including.
a turbomaxer, - two sets to prepare the organic phase to dispersing and the aqueous dispersant phase comprising each an insulated tank, a positive displacement pump and a set of insulated pipes.

21 This type of device allows the preparation of aqueous dispersions at atmospheric pressure and at a flow rate at least 100 l / h, by simultaneous contact in the mixer of the organic phase to be dispersed in the molten state, comprising on the one hand the one or more polymers) biodegradable) with the viscosity reducing agent, and on the other hand the aqueous dispersant phase comprising the stabilizing agents.
The second family of aqueous dispersions constituted by an organic phase dispersed in a dispersant aqueous phase free of organic compounds volatile substances that can be used for the preparation of aqueous film-forming compositions of high dry matter, is directly extracted and purified microorganisms.
The Applicant Company has found that for the preparation of said aqueous film-forming composition according to the invention, it is necessary to adjust the conditions of purification of the native polymer granules biodegradable, so that their agent content stabilizers, in particular protein, between 1 and 5 ~, preferably between 1 and 4% by dry weight per ratio to the dry weight of polymers.
The Applicant Company has indeed found that levels of stabilizing agents, especially proteins, less than 1%, aqueous polymer dispersions in general did not show a level of sufficient stability to be incorporated as a binder aqueous film-forming compositions with a high dry matter content.
At contents greater than 5 ~, the content too high in stabilizing agents, especially in proteins, becomes detrimental to coalescing properties necessary for the manufacture of coating colors, aqueous pigment film preparations and aqueous paints, or aqueous adhesive compositions.
The protein content of native granules bacterial polymers can be adjusted by any method

22 known in itself by those skilled in the art, during the steps of purification.
The applicant company recommends using purification methods of the type of those putting in sodium hypochlorite, methods which make it possible to digest the biomass without degrading polyhydroxyalkanoates, and leaving a quantity of stabilizing proteins of the colloidal suspension sufficient to facilitate the coalescence of the granules native.
Preferably, the dry matter of the dispersion aqueous used for the preparation of the compositions aqueous film-forming is between 25 and 70 ~ by weight, preferably between 35 and 70% by weight, and more preferably between 45 and 65% in weight.
An aqueous dispersion composed of an organic phase dispersed in a dispersing aqueous phase, characterized in that it has a solids content of between 25.
and 70 ~ by weight, preferably between 35 and 70 by weight, and even more preferably between 45 and 65 ~ by weight and with respect to its dry matter, 95 to 99, 5% in dry phase organic comprising at least a biodegradable polymer, and from 0.5 to 5 ~ of at least one stabilizing agent, appears particularly suitable for preparation of an aqueous film-forming composition according to the invention.
The preparation of the aqueous film-forming composition according to the invention is carried out by the mixture of its constituents, by any method known in by the person skilled in the art, as will be exemplified below.
after.
The aqueous film-forming composition thus obtained is particularly well suited to the manufacture of aqueous pigment compositions such as sauces coating, aqueous pigment film preparations or paints, or aqueous adhesive compositions.

23 Preferably, the aqueous pigment composition according to the invention has a dry matter at least equal at 30 ~ and contains.
as a binder, an aqueous dispersion of biodegradable polymer belonging to one of the families defined above, at least one adjuvant, and at least one pigment.
Preferably, the aqueous adhesive composition according to the invention has a solids content of at least 30 and contains.
as a primary binder, an aqueous dispersion of biodegradable polymer belonging to one of the families defined above, as a secondary binder, a polysaccharide selected from among the native and modified starches, native and modified celluloses, preferably soluble in water, at least one adjuvant, and optionally at least one pigment.
The aqueous adhesive composition according to the invention may be in particular an adhesive for labeling, for spiral mandrels, for corrugated board, for bags, for wallpapers, for carpets and carpet, for laminating, for non-woven, for cigarettes, mural.
It can also be a textile primer, a varnish, of a composition for temporary protection, of a anti-graffiti composition, a coating composition or of a waterproofing composition.
The aqueous adhesive composition can be easily diluted with water according to its mode of application on the surface or material to be coated or glued.
Other features and advantages of the invention will appear on reading non-limiting examples described below.

24 Example 1 Three aqueous pigment compositions are prepared high dry matter from three aqueous dispersions devoid of volatile organic solvent.
A first aqueous dispersion (DISPERSION No. 1) is prepared from GALASTIC ~ L68 polylactate, manufactured marketed by the company GALACTIC, presenting a weight number of 68,000 Da, an index of polydispersity of 2.78, a transition temperature glassy at 55 ° C, a complex viscosity of 2.380 Pa.s at 130 ° C and 34 Pa.s at 160 ° C, a degree of crystallinity close to 0 ~ and a lactic acid D after hydrolysis of 12.4 As a viscosity reducing agent of this polylactate, diethylglycoldibenzoate marketed by the company VELSICOL under the brand name BENZOFLEX ~ 2-45, boiling point 236 ° C.
For the aqueous phase, the stabilizing agent used is polyvinyl alcohol POVAL JP 18Y, having a degree hydrolysis rate of 88 ~ 1%, a viscosity of 25 ~ 2 mPa.s, purity greater than 94 ~ marketed by society TVP JAPAN VAM & Co. Ltd.
The process for producing the aqueous dispersion of polylactate, comprises the following steps.
1) preparation of the organic phase to be dispersed In a tank heated electrically and maintained at 160 ° C., 1,300 g of pellets of PLA type are introduced GALASTIC ~ L68 and 700 g of BENZOFLEX ~ 2-45 (a report between a biodegradable polymer and a reducing agent viscosity 65/35).
When these products are completely melted, the mixture is made homogeneous by stirring.
2) preparation of the aqueous dispersant phase.

Under mechanical agitation, it is dispersed in 3.200 g deionized water and at 80 ° C, 135 g of polyvinyl alcohol POVAL JP 18Y.
3) production of the aqueous dispersion.
Simultaneous mixing of the organic phase with dispersing and dispersing aqueous phase is achieved in a commercial laboratory emulsifier group by the company EMULBITUME.
The organic and aqueous phases are decanted into 10 their respective heat insulated tanks, thermostated at 160 ° C and 60 ° C.
Volumetric pumps are put into operation in closed circuit to adjust the respective temperatures and adjust the flow rates so as to obtain a Dispersed organic phase of 97.2% and an stabilizer of 2, 8% compared to the dry matter of the aqueous dispersion.
After opening the valves, the organic phases and water are sent simultaneously and continuously The ATOMIX C turbomaxer at 8900 rpm.
We then prepare a second, a third and a fourth aqueous dispersion of polylactate according to the same procedure as above, with the difference that.
- for DISPERSION No. 2, we incorporate as agents

Stabilizers 85 g POVAL JP 18Y, 3.5 g xanthan gum (SIGMA ALDRICH) and 32 g of acetylated starch (IA - 1,8) and extruded, manufactured and marketed by the company Applicant - for DISPERSION No. 3, we incorporate as agents stabilizers 85 g of POVAL JP 18Y, 7 g of xanthan (SIGMA
ALDRICH) and 64 g of acetylated starch (IA - 1,8) and extruded, manufactured and marketed by the company Applicant, and - for DISPERSION No. 4, we replace the 700 g of BENZOFLEX viscosity reducer ~ 2-45 by 325 g of diisobutyl adipate, is incorporated as stabilizing agents 85 g POVAL JP 18Y, 7 g xanthan (SIGMA ALDRICH) and 64

26 g of acetylated starch (IA - 1,8) and extruded, manufactured and marketed by the applicant company and the pH at a value of 5.0 by adding 1N sodium hydroxide.
Production tests of two other dispersions by exactly reproducing the conditions manufacturing of DISPERSION No. 1 but, for the first time adding only 18 g of POVAL JP 18Y
stabilizing agent on dry / MS of 0.4 ~) and for second, adding 375 g of POVAL JP 18Y
stabilizing agent on dry / MS 7%). We observe that in both cases, unlike the other 4 preparations, it is impossible to obtain an aqueous dispersion, it is impossible to make an aqueous dispersion having a stability greater than a few hours (immediate coagulation).
The characteristics of the four aqueous dispersions stable are given in the following Table I.

27 Table I

DISPERSIONDISPERSIONDISPERSIONDISPERSION

Dry Matters 59, 599, 577, 46.1.

Content in phase organic dry 97.2 97.5 96.4 94.6 /

MS (%) Agent content stabilizers in 2.8 2.5 3.6 5.4 sec / MS (%) pH 2.2 2.2 2.2 5.0 Average diameter 5.1 5, 0 5, 4 4, 2 (1 ~) viscosity Brookfield 20C 390 495 870 3200 (MPa.s) Coagulation after absence absence absence 2 months With 5,000 DISPERMAT mechanical stirring is prepared t / min and for 2 min, three pigment compositions according to the invention, by progressively adding, to 16 g of an aqueous pigment suspension of carbonate of calcium, marketed by OMYA under the brand name SETACARB ~, 75 ~ dry matter, 8 g of demineralized water and 35 g of either DISPERSIONS No. 1, 2 or 3 having the characteristics given in Table I.
These aqueous pigment compositions, respectively obtained with dispersions 1, 2 and 3 are named CP1, CP2 and CP3. Their main characteristics are given in the following Table II.

28 Table II

Dry matter (~) 55.7 55.6 54.5 pH 6, 46, 6, 6, 5 Brookfield Viscosits 20C (mPa.s) It is found that the pigment compositions aqueous solutions thus obtained are stable in the sense that does not observe coagulation, flocculation or inversion phase. These pigment compositions exhibit elsewhere good film-forming properties and viscosity acceptable level to be used as a aqueous pigment film preparations.
Moreover, we prepare from the DISPERSION
No. 2 of new aqueous dispersions (DISPERSIONS No. 5 to n ° 9) adding to this dispersion n ° 2 by simple mixing, as complementary stabilizing agents, increasing amounts of a hydrogenated glucose syrup POLYSORB ~ 70/12/12 as marketed by the company Applicant.
The added quantities of this syrup diluted to 59.5%
MS for 100 g DISPERSION No. 2 itself at 59, 5 ~ MS, as well as the film-forming characteristics at 20 ° C and 95 ° C
DISPERSIONS No. 5 to 9 are given in Tables III
and IV following.

29 Table III
DISPERSIONS n 2 5 6 7 8 9 59, 5 ~ MS (g) 0 1 2 5 10 15 Agent content stabilizers in 2,5 3,5 4,5 7,5 12,5 17,5 sec / MS (%) Content in phase organic in 97.5 96.5 95.5 92.5 87.5 82.5 sec / Ms (%) Table IV

not Features filmognes Trs bonne Good Bonne MauvaisTrs (Cohsion of the bad dry film) 20C

Features filmognes Trs bonne Good Bonne MauvaisTrs (cohsion of bad dry film) 95C

(Tuvage) Content water very good very good bad bad (got good bad movies 95C) Visual Aspect Transpa- Lger Lger Trouble Trouble Trouble 20C rent troubletrouble Visual Aspect Transpa- Trs Lger Trouble Trouble Trouble 95C rent lger trouble trouble Coalescence Good Good Good Insuffi- Insuffi- Insuffi-20C health health Coalescence Good Good Good Insuffi- Insuffi- Insuffi-95C health and health It appears ultimately that an agent content stabilizers between 0.5 and 5 ~ dry on the MS of aqueous dispersions allows both.
to obtain stable aqueous dispersions (absence 5 coagulation or caking even after several months), and having more good properties film-forming and good water-proof properties, and to prepare pigmentary compositions also having good film-forming properties while 10 by presenting rheological characteristics adapted to their use as pigmentary film-forming preparations aqueous.
Example 2 An aqueous pigment composition is prepared intended for a TOP-LAYER type of coating type / MONO-LAYER (top coat, single coat) from the DISPERSION No. 4 of Example 1 and compares it to a formula coating sauce prepared from a dispersion synthetic aqueous as follows.
1) Formulation of a sleeping sauce called TOP-LAYER / MONO-LAYER (top coat-single coat) from the DISPERSION No. 4 of Example 1 (SAUCE 1, according to the invention) Is added successively with mechanical stirring RAYNERI at 700 rpm and for 1 hour.
- 1.115 g of an aqueous pigment suspension of calcium carbonate, marketed by the company OMYA
under the brand SETACARB ~ 80 OG at 76 ~ MS, 328 g of an aqueous pigment suspension of kaolin, marketed by the company IMERYS under the brand SUPRAGLOSS ~ 95 to 66 ~ of MS, - 340 g of DISPERSION No. 4, 126 g of polyol type plasticizer manufactured and marketed by the applicant company under the name of brand NEOSORB ~ 70/70 to 70 ~ of MS, 12 g of dispersant marketed by the company CIBA under the trademark DISPEX ~ N40, - 61 g of Carboxy Methyl thickener Cellulose marketed by the company NOVIANT under the FINNFIX mark ~ 10 to 10% MS, - 10 g of insolubilizer marketed by the company BASF under the brand URECOLL ~ S at 56 ~ MS and - 8 g of lubricant marketed by the company Nopco Paper Technology under the brand NOPCOTE ~ C 104 at 48%
dry matter.
The dry matter of the pigment composition is adjusted to 60% with deionized water. The pH of this same pigment composition is adjusted to 9 with welded.
The viscosity measured at the Brookfield viscometer is 620 mPa.s at 100 rpm - 30 ° C.
The viscosity measured with the Hercules rheometer (model of type DV-10 manufactured by Kaltec Scientific, Inc.) at a shear strength of 40,000 s-1 is 42 mPa.s.
2) Formulation of a so-called top-layer coating sauce / Mono-Layer (Top Coat / Single Coat) control from synthetic aqueous dispersion (SAUCE 2):
The preparation of the control pigment composition is identical to that previously described but the Dispersion No. 4 is replaced by an aqueous dispersion Synthetic Styrene-Butadiene type marketed by the company DOW under the brand DOW ~ DL 950 (50% of material dry; pH of 5.7; Brookfield viscosity of 98 mPa.s).
The dry matter of the pigment composition is adjusted to 60% with deionized water. The pH of this same pigment composition is adjusted to 9 with welded.
The viscosity measured by the Brookfield viscometer is 580 mPa.s at 100 rpm - 30 ° C.

The viscosity measured with the Hercules rheometer (model of type DV-10 manufactured by Kaltec Scientific, Inc.) at a cisaïllement of 40 000 s-1 is 24 mPa.s.
3) Coatings and physical measurements of papers coatings These two pigment compositions are coated on support paper with a weight of 39 g / m 2 using a HELICOATER ~ 2000 type coating apparatus manufactured and marketed by DIXON. The sleeping done is blade type (Blade coating).
The deposits of these two pigmentary compositions are respectively 19 g / m ~ for the composition containing DISPERSION No. 4 and 18 g / m composition containing the synthetic aqueous dispersion.
The papers are then calendered using a laboratory type radiator RK 22 HU manufactured by the Ramisch & Co. company The calendering step is a necessary step to give the coated papers a smooth and shiny appearance.
The calendering conditions are 1 pass at 2.5 bars and at 120 ° C.
Papers after being stored in the room packaged (23 ° C / 50% RH) are then analyzed.
The results are shown in Table V below.
Table V

(According to (according to art invention) Whiteness () 82.3 81.4 Opacit (~) 92.1 90.7 Liss (ml / min) 25 26 Porosit (ml / min) 9 6 Rigid sense walking (mN) Papers coated with sleeping sauce, according to the invention, containing DISPERSION No. 4 (SAUCE
1) give, compared to the sleeping sauce containing the synthetic aqueous dispersion (SAUCE 2), identical results in terms of smoothness, porosity, rigidity and better in terms of whiteness and opacity.
Example 3 The aqueous pigment composition CP1 is used as obtained in Example 1, as a film-forming preparation adhesive aqueous pigment, in comparison to a control adhesive formulation.
Said control adhesive formulation is prepared by mixing at 5000 rpm for 2 min.
- 16 g of pigment suspension SETACARB ° 85 OG to 75 dry matter marketed by the company OMYA, - 8 g of demineralised water, - 35 g of RHODOPASS® A 013P latex such as sold by the company RHODIA (MS 54 ~, pH 4.5, viscosity of 6000 mPa.s) and corresponding to an acetate of vinyl plasticized with dibutyl adipate. This formulation control adhesive has a BROOKFIELD viscosity of 8500 mPa.s at 20 ° C.
We evaluate the bonding performance of the aqueous pigment composition CP1 of Example 1 and the comparison formulation according to a test FIPAGO measuring the development of adhesiveness on STROHLEIN apparatus.
The principle of this test is to appreciate the evolution over time of resistance to pulling developed by the adhesive compositions tested between two papers, one laid on a fixed support, the other attached to an articulated arm.
Both papers are of the same quality, of dimensions 20 cm x 6 cm and whose main characteristics are the following .

- Weight. 66 g / m2 - Cobb: 19 g / m2 - AFNOR porosity: 7.6 ml / min - internal cohesion (SCOTT BOND). 550 J / m2 The value 100 corresponds to an impossibility of separation of papers, and the value 0 at a detachment immediate.
For a deposit of 40 g of adhesive compositions tested (CP1 or control preparation) by m ~ of paper, obtains the FIPAGO adhesiveness results presented in the following table VI
Table VI
Adhsivit after. 10 30 50 seconds seconds Pigment composition 2 36 Dibrillation adhsive according to paper the invention Adhesion Formulation 24 82 Deterioration witness of the paper It appears that the adhesive pigment composition according to the invention, although leading to less gluing fast as the control adhesive formulation, presents good adhesive characteristics.
Example 4 Two aqueous masts are prepared and two satin aqueous paints according to the given compositions in the following Table VII, replacing totally weight for weight acrylic styrene binder resin REPOLEM ~ 2423 (latex at 50 ° MS, BROOKFIELD viscosity of 10,000 mPa.s at 20 ° C, with pH close to 8, minimum temperature of + 15 ° C filming and transition temperature vitreous temperature of + 18 ° C) by either of the DISPERSIONS n ° 1 and No. 2 acting as a binder resin.
Table VII
Compositions in g Paintings Paintings Satines Water of Mineralise 259.7 139.0 Cellulose thickener 3,7 1,0 (NATROSOL ~ PLUS 430 -Aquacon) Ammonia (22 ~ MS) 0, 1 0.1 Thickener polyurethane 4.2 12.8 50% MS

(COATEX ~ BR 10 ~ OP - CORTEX) Dispersant 40% MS 2.4 4.9 (COATEX ~ P / 90 - CORTEX) Antifoam 0,4 1,5 (NOPCO 8034 ~ - HENKEL) Biocide 50% MS 1.7 2.0 (ACTICIDE ~ BX - THOR) Pigment white 77,8 222,6 (8960 Titanium Dioxide -DUPONT) Pigment Calcium carbonate 84.8 40.5 (DURCAL ~ S - OMYA) Pigment Calcium carbonate 424.2 60.7 (DURCAL ~ 2 - OMYA) Binding resin 84.9 458.1 Water of Mineralize 50.9 55.9 Coalescence Agent 4.3 0 (TEXANOL ~ - EASTMAN) Antifoam 0.9 0.9 (NOPCO 8034 ~ - HENKEL) Ammonia (22 ~ MS) Qsp pH Qsp pH

Neighbor's neighbor The ingredients of the paints are incorporated into the order of presentation of Table VII, following a fixed procedure, and using for this purpose a disperser of brand DISPERMAT ~ CV specially designed for preparation of paintings.
The characteristics of the different paintings Aqueous masts or satin are included in the table Following VIII.

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.I ~~ mz U1 ii U ~ N ~ - ~ -1 v DISPERSIONS No. 1 and No. 2 appear to both to completely replace the binder resin non-biodegradable plastic REPOLEM ° 2423, in the formulation of aqueous paints, satin or satin, without compromise neither their physical stability nor their basic properties.
It seems advantageous that the paintings including DISPERSIONS No. 1 and No. 2 present unlike the control paints, a flow threshold favorable to their application on a support.
Example 5 A compliant aqueous adhesive composition is produced to the invention from an aqueous dispersion without of organic solvents of GALASTIC ~ L 68 polylactate.
This aqueous dispersion is obtained according to described in Example 1 (Dispersion 5) and contains.
- Demineralized Water . 40.86 polyvinyl alcohol POVAL JP 18Y. 1.07 - xanthan. 0.07 - GALASTIC ~ L 68 polylactate. 46.40 - dipropylene glycol dibenzoate. 5.80 - methyl ester of vegetable oil. 5.80 This dispersion has a BROOKFIELD viscosity of 650 mPa.s for a dry matter of 56%.
The usable aqueous adhesive composition is prepared as a cigarette glue or counter glue gluing by proceeding with the dispersion of 300 g of starch soluble in cold water marketed by society Applicant under the brand name DEXYLOSE ~ 250 in 700 g of demineralised water.
After 30 minutes of mechanical stirring at 1500 rpm, 300 g of the above aqueous dispersion are introduced.

The pH is then adjusted to a value of 3 by adding of soda lye.
This gives a homogeneous adhesive having a BROOKFIELD viscosity of 4200 mPa.s for dry matter 35.2 Collage tests on FIPAGO material show that this highly biodegradable glue and repulpable has a very good aptitude to be used in laminating papers, since one notes a paper defibration after only 30 seconds.

Claims (13)

1. Use, for the preparation of a composition aqueous film-forming agent of a dry matter at least equal to 30%, an aqueous dispersion composed of a phase organic dispersed in a dispersant aqueous phase, said dispersion containing in relation to its material dried:
from 94 to 99.5% in dry phase of organic phase comprising at least one biodegradable polymer, and from 0.5 to 6% of at least one stabilizing agent. 2. Use according to claim 1, characterized in that the film-forming composition has a material at least 35%, preferably between 45 and 99.9% by weight on dry basis and more preferably still between 50 and 75% by weight on a dry basis. 3. Use according to one or the other claims 1 and 2, characterized in that the aqueous film-forming composition is a composition aqueous pigment or an aqueous adhesive composition. 4. Use according to any one of Claims 1 to 3, characterized in that the dispersion aqueous is devoid of volatile organic compounds. 5. Use according to any one of Claims 1 to 4, characterized in that the phase dispersed organic constituent of said dispersion aqueous, comprises:
at least one viscosity reducing agent having a solubility parameter between 15 and 28 (J.cm) 3) 0.5, preferably between 16 and 23 (J.cm-3) 0.5, plus preferentially still between 18 and 21 (J.cm-3) 0.5, and a hydrogen bonding parameter .delta.H between 3.5 and (J.cm-3) 0.5, and preferably between 4 and 13 (J.cm-3) 3) 0.5, and even more preferably between 5 and 10 (J.cm-3) 0-5, and - at least one biodegradable polymer in a ratio polymer weight / viscosity reducing agent 99.8 / 0.2 at 60/40, preferably between 97/3 to 70/30, more preferably between 92/8 and 70/30. 6. Use according to any one of Claims 1 to 4, characterized in that the dispersion aqueous is of bacterial origin and present between 1 and 5 %, preferably between 1 and 4% of stabilizing agents. 7. Use according to any one of Claims 1 to 6, characterized in that the dispersion aqueous composition comprises a non-biodegradable polymer crystallizable, preferably selected from the group consisting of biodegradable polymers of the type polylactates (or PLA), polymalates (or PMA), polyhydroxyalkanoates (or PHA), polycaprolactone (or PCL), polyesteramides (PEA), aliphatic copolyesters (PBSA) and the aliphatic-co-terphatalate copolyesters (PBAT), celluloses or starches highly acetylated or rendered hydrophobic by introduction of fixed fatty chains, taken alone or in combination, as homopolymers, heteropolymers, whether linear, branched, crosslinked, dendritic or grafted. 8. Use according to any one of Claims 1 to 7, characterized in that the agent stabilizer is selected from the group consisting of proteins, starches, polyvinyl alcohols, gums, polymeric emulsifiers, celluloses and polyols, in native or modified form, taken alone or in combination. 9. Use according to any one of Claims 1 to 8, characterized in that the composition aqueous film former thus obtained is intended for preparation of pigment coating sauces, aqueous pigment film preparations and aqueous paints. 10. Use according to any one of Claims 1 to 8, characterized in that the composition aqueous film-forming agent is intended for the preparation of aqueous adhesive compositions, in particular an adhesive for labeling, for spiral mandrels, for cartons corrugated, for bags, for wallpapers, for carpets and mats, for laminating, for nonwovens, for cigarettes, mural, a textile primer, a varnish, a composition for temporary protection, a composition anti-graffiti, a coating composition or a waterproofing composition. 11. Aqueous dispersion composed of an organic phase dispersed in a dispersing aqueous phase, characterized in that it presents:

a dry matter content of between 25 and 70%
weight, preferably between 35 and 70% by weight, and more preferably still between 45 and 65% in weight, and - in relation to its dry matter, from 95 to 99.5% in dry organic phase comprising at least one polymer biodegradable, and from 0.5 to 5% of at least one agent stabilizing. 12. Aqueous pigment composition characterized in what it includes an aqueous dispersion according to the claim 11. 13. An aqueous adhesive composition characterized in that that it comprises an aqueous dispersion according to claim 11.