KR20070008522A - 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 preparation of an aqueous filmogenic composition wherein dry matter, which is at least equal to 35 %, for, is used in addition to an aqueous dispersion consisting of an organic phase dispersed in a dispersing aqueous phase, said dispersion containing, in relation to the dry matter,94 - 99.5 % dry organic phase comprising at least one biodegradable polymer, and 0.5-6 % of at least one stabilizing agent. ® KIPO & WIPO 2007

Description

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}

The present invention relates to the use of an aqueous dispersion of one or more biodegradable polymers containing one or more stabilizers for the production of high solids aqueous film-forming compositions.

The present invention more particularly relates to the use of the aqueous adhesive composition and the aqueous pigment composition of the film-forming composition thus obtained.

Within the meaning of the present invention, the term "aqueous film-forming composition" is interpreted to mean a composition capable of forming a film or coating by removing water initially present in the composition.

The term “aqueous adhesive composition” is interpreted to mean an aqueous film-forming composition that can form a seal between two different materials of the same or different properties or can be adhered to a support.

In particular compositions for the temporary protection of metal sheets, wood varnishes, anti-scribing compositions, wall waterproofing compositions, textile finishes or textile sizing compositions, fertilizers, pharmaceutical or seed coating compositions, or else leather, paper, wood, textiles (woven or Nonwoven fabrics), synthetic fibers, plastics, glass and other materials.

The aqueous adhesive compositions exhibit varying water contents and are generally 30 to 95% of the total weight of these compositions.

Water acts as an inert dispersant or solvent for the constituents of these compositions, and by coating, casting, spraying, dipping or impregnation, or by the use of brushes, rollers, blocks or other tools, to the surface or material to be coated or sized It is generally possible to control the viscosity and flowability of these compositions so that the compositions are easily applied.

The adhesive composition essentially comprises the binder and the auxiliary in a form dissolved in water or simply dispersed in water.

Within the meaning of the present invention, the term "aqueous pigment composition" is also understood to mean a film-forming composition which is provided in the form of an aqueous suspension of pigments, binders and auxiliaries.

The aqueous pigment composition may in particular be a coating colorant, an aqueous paint and an aqueous film-forming pigment formulation, for example a filler-comprising adhesive.

In the field of paper making, for example, the aqueous pigment composition is a source of the paper's final appearance (opacity, whiteness, smoothness and gloss) and is responsible for the suitability of printing, in particular color printing.

Water is generally an important component of the pigment composition, which constitutes 30% to 95% of the total weight of the pigment composition. It is a vector of all other components.

The pigment constitutes a solid filler of the aqueous pigment composition. It is generally a material of the calcium carbonate, calcium sulfate, barium sulfate, calcium sulfoaluminate, kaolin, talc, titanium oxide or plastic pigment type.

In the case of coating colorants, the pigments generally comprise 80 to 92% by weight of the aqueous pigment composition solids content (SC) and generally cover or impart smoothness to the paper fibers or optical properties (whiteness, opacity, gloss) Or to printing properties (in the case of coating colorants or coating films).

In the case of aqueous film-forming pigment preparations and paints, the amount of pigment is generally from 10 to 95% by weight of the solid content of the aqueous pigment composition, more generally from the solids content, depending on the type of formulation selected (matte, glossy or glossy paint). 35 to 95 wt%.

Adjuvants of these portions are aids present in small amounts in an aqueous film-forming composition that is an aqueous pigment composition or an aqueous adhesive composition.

These adjuvant agents in fact generally represent 0.3 to 5%, or 1 to 3% by weight of the solid film-forming composition solids content.

These are generally classified into three categories.

The first category is alkalizing agents, dispersants (sodium hexametaphosphate, sodium polyacrylates), wetting agents, antifoaming agents (mineral oils, silicone products, fatty acid esters, fatty amines) or biocides (quaternary ammonium, phenol, aldehydes, dyes) Corresponds to the forming agent (formulating agent).

The second category gives the film-forming compositions the ability to work well on the machine, including flow modifiers (e.g. cellulose compounds, polyurethane thickeners), moisturizing aids (carboxymethylcellulose, starches and derivatives, casein, Protein, polyol) or lubricant (calcium stearate, sulfonated oil, polyol).

This is because in some cases, it is necessary for the aqueous film-forming composition to be applied to the machine at a high speed (speed can be faster than 1500 mm / min in paper machine).

The third category makes it possible to improve or control the final properties of aqueous film-forming compositions, insolubilizing agents (crosslinking agents and resins such as urea-formaldehyde, melamine-formaldehyde, glyoxal, zirconium salts), fluorescence Corresponding to whitening agents (di-, tetra- or hexasulfonated stilbene derivatives), coalescence agents or shading dyes (violet helio BNZ, Unisperse blue).

The last component of the aqueous film-forming composition, which is an aqueous pigment composition or an aqueous adhesive composition, is a binder, and generally these portions

5-20% of the aqueous film-forming composition solids content for coating colorants,

5 to 90% of the aqueous film-forming composition solids content for aqueous film-forming pigment preparations, such as filler-containing adhesives,

For paints comprising matte, gloss or glossy paints, 5 to 65% of the aqueous film-forming composition solids content.

These serve in particular to ensure that the pigment layer or film or coating obtained by the subsequent removal of water is cohesion.

Their amount is selected according to the adhesive used, the nature of the pigment (s) optionally incorporated and the concentration of the aqueous film-forming composition.

The binder used is generally a natural raw material, for example starch (wheat, corn) or protein (casein), or a synthetic raw material, for example polyvinyl alcohol or latex.

More specifically, latex (or “aqueous polymer dispersion”) corresponding to a colloidal dispersion of the synthetic polymer in an aqueous phase, sometimes also referred to as a polymer emulsion or suspension, is a dispersion of the polymer microparticles suspended in the aqueous phase. .

Synthetic polymer aqueous dispersions are conventionally prepared based primarily on methods of direct emulsion polymerization of synthetic monomers.

Latexes of this type generally include polymer particles synthesized by direct emulsion polymerization of monomer pairs of, for example, styrene / butadiene, styrene / butyl acrylate, methyl methacrylate / butadiene or vinyl acetate / butyl acrylate types. .

Each of these monomers

Stiffness, gloss or absorption of ink (for styrene, acrylonitrile or methyl methacrylate),

Resistance to solvents and oils (for acrylonitrile),

Resistance to aging by UV irradiation (for methyl methacrylate, butyl acrylate or butadiene),

Porosity (for vinyl acetate),

To impart the properties of bonding or ductility (in the case of butyl acrylate or butadiene).

Generally, the synthetic latex thus used in the film-forming composition has a solids content of 45 to 60%, a density of about 1, a Brookfield viscosity of 100 to 300 mPa · s and a pH of 4.5 to 8 Indicates.

However, it is known to those skilled in the art that these synthetic products are not biodegradable or cannot be composted and furthermore difficult to regenerate, which is a major disadvantage of this type of synthetic polymer aqueous dispersion, which limits their use.

The absence of biodegradability poses serious environmental problems, particularly during landfill disposal.

There has been a proposal to use starch derivatives as binders. However, while starch is biodegradable, it is poorly bound and water sensitive, which is, for example, film in multicolor offset printing, wash-outs or flexographic printing inks where water is applied at each station. Particularly detrimental to the application of the forming composition.

To overcome this problem, polymer aqueous dispersions made from biodegradable polymers have been the subject of intensive research and development.

The term "biodegradable polymer" is understood to mean a polymer that can be degraded not only under the action of microorganisms, in particular soil microorganisms, but also under the action of natural agents, in particular water.

Such biodegradable polymer aqueous dispersions are known, but can generally be obtained only by the use of volatile organic solvents, for example as known from Japanese Patent Application No. 10-101911 and US Pat. No. 5,747,584. .

More specifically, US Pat. No. 5,747,584 discloses the use of biodegradable polymer aqueous dispersions, especially of the PHA type, to form adhesive dispersions that can be used for adhesive bonding of nonwovens.

However, the aqueous dispersions are always prepared using toluene, ethyl acetate, acetone, halogenated solvents or other suitable volatile organic solvents.

The term “volatile organic compound” is interpreted to mean any organic compound having a vapor pressure of at least 10 Pa at a temperature of 25 ° C. or having the corresponding volatility under certain conditions.

However, to the best of our knowledge, three types of processes are known to date that make it possible to utilize one or more biodegradable polymer aqueous dispersions free of volatile organic solvents.

The first type of process known in the art consists of extruding a biodegradable polyester dispersion having a high solids content (SC) and a very high viscosity.

In this regard, European Patent Application No. 1 302 502 discloses an aqueous solution having a constant surface tension in order to obtain an aqueous dispersion having an SC of at least 40%, a viscosity of at least 1000 mPa · s and preferably 1500 to 10000 mPa · s. There is provided a process consisting of treating a melt blend of biodegradable polyesters with emulsifiers and certain additives at high temperatures and pressures by methods such as extrusion processes.

The method consists of melting the biodegradable polyester in an extruder and then introducing an aqueous emulsifier downstream of the melt blend. Subsequently the blend is kneaded at a temperature below 100 ° C.

International patent application WO 97/49762 also discloses a biodegradable polymer aqueous dispersion obtainable by extrusion comprising starch modified by esterification dispersed in an aqueous phase. The patent application also discloses a solventless method for the preparation of the aqueous dispersion.

The method includes preparing a melt blend of polymer and optional plasticizer at a temperature of 100 to 180 ° C. and then maintaining the blend at a high temperature before adding water and dispersant gradually.

 A second type of method known in the art that makes available one or more biodegradable polymeric aqueous dispersions free of volatile organic solvents is provided by the applicant and is dispersed in an aqueous phase for dispersion and which comprises one or more viscosity-lowering agents. It consists of an aqueous dispersion of at least one biodegradable polymer composed of an organic phase comprising and free of volatile organic compounds.

Aqueous dispersions of one or more of these biodegradable polymers were filed in France on September 12, 2003 by the applicant, but have not yet been examined.

Aqueous dispersions of these one or more biodegradable polymers exhibit properties relating to solubility parameters and hydrogen bond formation ability and include such biodegradable polymers and viscosity-lowering agents used in specific weight ratios.

In this case, the viscosity-lowering agent (or "plasticizer") is a heavy organic compound incorporated into the polymer and is preferably a cross between the high viscosity and the chains which can be biodegradable or compostable, which is responsible for the mechanical aggregation of the polymer. At least partially destroy the action.

In addition, the absence of volatile organic compounds in these aqueous dispersions does not exceed the content of components of the aqueous dispersion, i.e. volatile organic compounds (or VOCs) of 5000 ppm or less, preferably 1000 ppm or less, more preferably 500 ppm or less. ) Is reflected by the content.

A third type of method known in the art makes it possible to obtain an aqueous dispersion of one or more bacterial biodegradable polymers of various stability of the polyhydroxyalkanoate type directly from the microorganism comprising them.

Since the method is based on purifying the natural biodegradable polymer granules by chemical or enzymatic routes after extraction by cell lysis, the method can lead to the preparation of biodegradable polymer aqueous dispersions free of volatile organic solvents.

A. Dufresne and E. Samain, Macromolecules , 1998, 31 , 6426-6433 disclose the preparation of stable aqueous dispersions of PHO from poly (β-hydroxyoctanoate) or microbial strain Pseudomonas oleovorans . It is. It is produced by fermentation under controlled pH conditions and the aqueous PHO dispersion is extracted using sodium hypochlorite.

The spontaneous stability of these aqueous PHO dispersions is explained by the persistence around the polymer granules in the suspension of the residues of certain proteins, in this case murein sacculus.

Processes of this type are also known for the preparation of aqueous dispersions of biodegradable polymers of microbial raw materials other than PHO, such as, for example, hydroxyvalerates and hydroxybutyrate copolymers (PHBV).

The use of biodegradable polymer aqueous dispersions free of volatile organic solvents as binders in aqueous film-forming compositions has been developed in the art, particularly with these biodegradable polymer aqueous dispersions isolated from microbial lines.

Specifically, international patent application WO 91/13207 is formed of β-hydroxyalkanoate (e.g., β-hydroxybutyrate and β-hydroxyvalerate), in particular alkali genes eutropus ( Alcaligenes eutrophus ) or an aqueous dispersion comprising a colloidal suspension in water of essentially amorphous particles of a polymer or copolymer extracted from the biomass of Pseudomonas oleoboranth , and their self-supporting films or Uses in the manufacture of biodegradable paper are disclosed.

The patent discloses the possibility of having available latexes produced from microorganisms having the properties necessary for their use as binders for pigment compositions and exhibiting the advantages of causing biodegradable and renewable coating films or coated papers.

However, the binding properties of the latex disclosed in this patent application are only manifested by a single class of polyhydroxyalkanoates having 1 to 12 carbon atoms in the side chain.

In addition, these latexes exist in their original form in the form of essentially amorphous wet granules, but they have the disadvantage that they are arranged in a highly crystalline state, especially after they have been deposited on the substrate and / or dried.

Indeed, this trend towards crystallization of these latexes on the one hand prevents them from being used correctly in areas where it is important to improve the particle adhesion of emulsions and on the other hand to obtain dry films that exhibit adequate mechanical and optical properties.

Specifically, the ability of aqueous polymer dispersions to form films requires that complete interpenetration / melting of the dispersed polymer particles is obtained after evaporation of water (a phenomenon referred to as "coalescence").

Thus, for some applications in coating colorants, coating films or paints, mechanical and optical properties similar to those typically obtained with latex of synthetic polymers which promote the melting of the particles on the surface of the substrate and are non-biodegradable or difficult to recycle It is important to keep the latex amorphous in order to obtain.

Thus, in order to prepare pigment compositions, improving the properties of the bacterial latex using soap or detergent type surfactants is necessary to precisely limit the effects of heat-induced crystallization of the latex, which is an international patent application. It is further recommended in WO 91/13207.

For this reason, the pigment compositions disclosed in the above international patent application are suitable for practical use in the field of application targeted by the applicant of the present invention because of the ability of biodegradable polymers to be strongly crystallized after being deposited on a substrate. It doesn't look.

In addition, in the above international patent application, it is envisioned for the production of films only for the possible use of latexes which exhibit a solids content of 15 to 30%, which is a particularly disadvantageous factor in terms of drying rate and proportion on industrial machines.

However, after evaporating water from latex at ambient temperature, it is possible to obtain dense and transparent films with slightly improved mechanical properties by using halogenated solvents of the chloroform type and / or by exposure to the vapors of these solvents during drying of the film. It is disclosed that.

The essential use of such volatile organic solvents constitutes a second serious obstacle to the industrial application of the process.

U.S. Patent No. 6 024 784 discloses as in the pigment composition intended for the preparation of paint binders, Pseudomonas fluorescein sense (Pseudomonas The use of poly (3-hydroxyalkanoates) having 6 to 16 carbon atoms in a monounsaturated or polyunsaturated side chain extracted from fluorescens ) is disclosed.

However, while biodegradable polymers can be provided in the form of latex very generally, in practice US Pat. No. 6,024,784 describes experimentally that of poly (3-hydroxyalkanoate) (PHA) for the preparation of solvent paints. Only use of organic solvents is envisioned.

Petroleum ether, diethyl ether or chloroform type organic solvents, toluene or xylene type aromatic solvents, or aliphatic solvents are recommended for dissolving PHA before use as a binder.

The solutions of this technique therefore do not meet the desired environmental requirements because only solvent paint formulations are provided.

Thus, without the need to perform harsh, difficult and complicated steps, it is preferably free of any volatile organic compounds, has a high solids content, contains only biodegradable components, coating colorants, aqueous film-forming pigment formulations, adhesives or An unmet need for providing a film-forming composition comprising an aqueous dispersion of one or more biodegradable polymers that is readily used in the preparation of an aqueous film-forming composition that is an aqueous pigment composition or an aqueous adhesive composition, such as an aqueous paint. exist.

The Applicant has thus far been considered unsatisfactory by providing the use of an aqueous dispersion of at least one biodegradable polymer comprising at least one stabilizer present in sufficient but not excess, for the production of such film-forming compositions. All of the above objectives were met.

Accordingly, the present invention is directed to producing an aqueous film-forming composition having a solids content of at least 30% in an aqueous dispersion consisting of an organic phase dispersed in an aqueous phase for dispersion,

About solid content

94-99.5% by dry weight of an organic phase comprising at least one biodegradable polymer, and

To the use of said dispersion comprising 0.5 to 6% of at least one stabilizer.

According to certain embodiments of the invention, the dispersions used for the preparation of aqueous film-forming compositions having a solids content of at least 30% are based on solids content.

95-99.5% by dry weight of an organic phase comprising at least one biodegradable polymer, and

0.5 to 5% of one or more stabilizers.

Preferably, the present invention exhibits a solids content of at least 35% by weight based on dry weight, preferably 45 to 99.9% by weight based on dry weight, more preferably 50 to 75% by weight based on dry weight. It relates to the use of the above defined aqueous dispersion for the preparation of an aqueous film-forming composition.

Applicants propose herein to use such aqueous dispersions with a high content of biodegradable polymers for the preparation of aqueous films-forming compositions with a high solids content.

As set out above, in the case of conventional aqueous pigment compositions, the solids content is provided primarily by the pigment and is completed by the binder and by the auxiliary to a lesser extent.

Accordingly, Applicants have found that making a stable aqueous film-forming composition, which is an aqueous pigment composition or an aqueous adhesive composition, from one or more biodegradable polymeric aqueous dispersions becomes increasingly difficult or virtually difficult as the dry matter content of the film-forming composition increases. It even overcomes technical biases that make it impossible.

This is because one or more biodegradable polymer aqueous dispersions known in the art generally exhibit excessively high viscosity.

For this reason, in the case of aqueous pigment compositions, the high solids content encourages strong interaction between the pigment and the components of the aqueous dispersion.

Afterwards, strong interactions can lead to phase inversion, which disrupts the homogeneity of the pigment composition while greatly increasing the viscosity.

The increase in viscosity is so great that the pigment composition becomes unsuitable for use in coating colorants, aqueous film-forming pigment formulations or aqueous paints.

In order to avoid such phase inversion, the Applicant has finally found that the stabilizer in the aqueous dispersion component of the film-forming composition needs to be present in an amount sufficient but not in excess, so as not to damage the good adhesion of the particles of the dispersed organic phase. It was.

These stabilizers may be proteins in natural or modified form, starch, polyvinyl alcohol, gum, cellulose and polyols, which may be used alone or in combination.

These stabilizers also include, for example, high molecular weight crosslinked acrylic copolymers comprising hydrophobic comonomers, especially crosslinked copolymers of alkyl methacrylates having 10 to 30 carbon atoms and acrylic acid (e.g. Noveon) Fe mulren ^® (Pemulen ^®)) can be a polymer emulsion, available from the best.

The stabilizer is preferably polyvinyl alcohol, gum arabic, xanthan gum or modified starch or cellulose with a degree of hydrolysis of 60 to 98%, preferably 70 to 90%, preferably esterification (methylation, carboxymethylation, Acetylated or alkyl succinylated) or etherified (cationic or hydroxypropyleneated) starch or cellulose.

These stabilizers are 0.5 to 6 dry weight percent, preferably 1 to 5.5 dry weight percent, more preferably 0.5 to 5 dry weight percent, very preferably 1.5 to 5 dry weight of the aqueous dispersion solids content in the aqueous dispersion. It should be present at a rate of%.

It is then possible to incorporate the biodegradable polymer (s) in the aqueous dispersion at 94 to 99.5%, preferably 95 to 99%, which has been achieved so far for the preparation of the aqueous film-forming composition according to the invention. High levels of aqueous dispersions have never been achieved.

This is because the Applicant has finally found that at a stabilizer content of less than 0.5%, the aqueous dispersion does not exhibit sufficient stability to be incorporated as a binder in an aqueous film-forming composition having a high solids content.

Excessively high stabilizer content with a content of more than 5% is detrimental to the adhesion properties required for the preparation of, for example, coating colorants, aqueous film-forming pigment formulations, aqueous paints or aqueous adhesive compositions.

The aqueous film-forming composition according to the invention is also characterized in that it is preferably obtained by using an aqueous dispersion, preferably both in its content and in the treatment, free of volatile organic solvents.

The absence of volatile organic compounds in the aqueous film-forming composition does not exceed the content of the components of the aqueous film-forming composition, i.e., VOC content of 15000 ppm or less, preferably 5000 ppm or less, more preferably 1000 ppm or less. Is reflected.

Thus, the aqueous film-forming composition according to the present invention does not exhibit any of the manufacturing drawbacks of the prior art and therefore inevitably impacts toxicity, additional costs, problems of manufacturing steps, spill-proofing, explosion-proofing or the environment. It is possible to avoid the need to install a device for recovering volatile organic solvents.

Applicants have finally discovered that the choice of an aqueous dispersion type without volatile organic solvents is not a limiting factor, which is essentially notable.

Thus, any method of known type for preparing one or more of the aforementioned biodegradable polymer aqueous dispersions may be suitable.

This is because it is possible to incorporate any type of biodegradable polymer into the aqueous dispersion by selecting a predetermined ratio of the desired stabilizer.

Applicants recommend using only aqueous dispersions comprising 0.5 to 6% by weight of one or more stabilizers relative to the dry weight of the aqueous dispersion for the preparation of high solids aqueous film-forming compositions.

Advantageously, Applicant has more particularly composed of two classes of aqueous dispersions, consisting of an organic phase dispersed in a dispersible aqueous phase free of volatile organic compounds for the preparation of a high solids aqueous film-forming composition according to the invention. It is recommended to choose.

The first class corresponds to aqueous dispersions developed by the Applicant and in their organic phase

A solubility parameter of 15 to 28 (J · cm ⁻³ ) ^0.5 , preferably 16 to 23 (J · cm ⁻³ ) ^0.5 , more preferably 18 to 21 (J · cm ⁻³ ) ^0.5 , It is a hydrogen bonding parameter δH 3.5 to 15 (J and cm ^{-3) 0.5,} preferably from 4 to 13 (J and cm ^{-3) 0.5,} more preferably from 5 to 10 (J and ^-3 cm) ^{0. 5} At least one viscosity-lowering agent, and

At least one biodegradable polymer having a polymer / viscosity-lowering agent weight ratio of 99.8 / 0.2 to 60/40, preferably 97/3 to 70/30, more preferably 92/8 to 70/30.

These aqueous dispersions have a low viscosity even at high solids content, and are particularly suitable for the preparation of pigment compositions having a high solids content according to the present invention.

Applicants choose to select viscosity-lowering agents from esters of acids or optionally ethoxylated alcohols, preferably mono-, di-, or triesters of organic acids, carbonic acids and phosphoric acids, sugars or polyols. Recommended.

It may also be selected from the group of ether esters of sugars, polyols (especially isosorbide), glycols or phenols, optionally ethoxylated ethers, glycols or epoxidized triglyceride oils.

It is desirable to choose biodegradable or compostable and food grade.

Viscosity-lowering agents are also advantageously classified within the category of heavy solvents having boiling points above 130 ° C., preferably above 150 ° C., more preferably above 200 ° C., which are particularly well suited for these functions.

The Applicant specifically applies viscosity-lowering agents to glycerol triacetate, isosorbide diacetate, isosorbide dibutylate, isosorbide diisobutylate, isosorbide dioctanoate, dimethyl isosorbide, ethyl lactate, Butyl lactate, tributyl citrate, triethyl citrate, bis (2-ethylhexyl) adipate, diisobutyl adipate, dibutyl phthalate, propionic acid, glycerol tributyrate, glycerol triisobutyrate, ethylene glycol dibenzoate , Diethylene glycol dibenzoate, propylene glycol dibenzoate, dipropylene glycol dibenzoate, triethylene glycol benzoate, dibutyl sebacate, diisobutyl sebacate, propylene carbonate, polyethylene glycol 400, polyethylene glycol 600, molecular weight This is about 500 caprolactone diols, vegetable It is recommended to select from the group consisting of oil methyl esters and dibasic esters of adipic acid, succinic acid and / or glucaric acid.

Biodegradable polymers, on the other hand, are amorphous, polylactate (or PLA), polymaleate (or PMA), polyhydroxyalkanoate (or PHA), polycaprolactone (or PCL), polyesteramide (PEA). ), Aliphatic copolyester (PBSA) and aliphatic-co-terephthalate copolyester (PBAT), cellulose or starch made highly hydrophobic by introducing acetylated or fixed fatty chains alone or in combination , Linear, branched, crosslinked, dendrimerized or grafted, homopolymers or heteropolymers.

Advantageously, the biodegradable polymers are heteropolymers, preferably the monomers thereof are D-lactic acid, L-lactic acid, glycolic acid, tetramethylglycolic acid, malic acid, β-propiolactic acid, butyric acid, valeric acid, phthalic acid, terephthalic acid, Succinic acid, adipic acid, sebacic acid, hexanoic acid, octanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid and octadecanoic acid and hydroxy acids, diols, and caprolactone Di-, tri- or tetrapolymers.

In the case of heteropolymers, we recommend selecting two or more monomers to be polymerized such that the first monomer is solid at ambient temperature and the second monomer is more fluid at ambient temperature. In this case an aqueous dispersion is obtained which is very suitable for forming a film.

Biodegradable polymers can be random, alternating, sequential or block heteropolymers.

Applicants have found that the strong crystallization ability of polymers is not recommended for aqueous dispersions for the preparation of aqueous film-forming compositions.

Therefore, it is advantageous to select a biodegradable polymer present in the dispersion in amorphous form, ie in amorphous or semicrystalline form, preferably in amorphous form.

In addition, Applicants recommend that the polymer be applied and / or dried on a support and then maintained in amorphous or semicrystalline form.

Within the meaning of the present invention, biodegradable polymers in "amorphous" form comprise up to 25% of polymers in crystalline form. “Semicrystalline” forms include up to 60% of the polymer in crystalline form.

Optionally, functionalized biodegradable polymers are preferably selected which are functionalized with groups of the aldehyde, fluoric acid, carboxylic acid, amine or alcohol type.

Finally, the Applicant has in particular by the Procter & Gamble (Procter & Gamble) four furnace DAX ^® (Nodax ^®) tradename amorphous or semicrystalline biodegradable polymer, and in particular to go lactic (Galactic) four of the PHA type sold as that in Gala stick ^® biodegradable PLA polymer of the type sold under the trade name of (Galastic ^®) L68 were found to be particularly suitable.

In particular, highly acetylated furnace DAX ^® and amorphous or semi-crystalline PLA and (or) or may be a blend of a fully hydrophobized starch.

In order to produce an aqueous dispersion suitable as a binder of the aqueous film-forming composition according to the invention, certain stabilizers present in certain proportions are required.

In this case, the object is easily achieved by the following sequential steps, which steps

1) Biodegradable polymer and viscosity-lowering agent having a ratio of biodegradable polymer and viscosity-lowering agent of 99.8 / 0.2 to 60/40, preferably 97/3 to 70/30, more preferably 92/8 to 70/30. Melting the blend at a temperature above the glass transition temperature of the biodegradable polymer to obtain a homogeneous melt to produce an organic phase to be dispersed in the aqueous dispersion,

2) dissolving at least one stabilizer completely, so that it is 0.5 to 6%, preferably 0.5 to 5%, based on the dry weight of the solids content of the aqueous dispersion,

3) The aqueous phase for dispersion and the organic phase to be dispersed thus obtained are dispersed into a mixer of the emulsifying apparatus, wherein the dispersed organic phase is at least 80% by weight, preferably at least 90% by weight, more preferably of the solids content of the aqueous dispersion. Introducing simultaneously and continuously at a pre-adjusted rate of introduction to be at least 95% by weight, and

4) recovering the aqueous dispersion thus obtained.

For the preparation of the aqueous dispersion, for example

A turbomixer, and

Emulbitume (Tregie, France) comprising two devices for producing the organic phase to be dispersed and the aqueous phase for dispersion (each comprising a thermal insulation vessel, a volumetric pump and a set of thermal insulation pipes). The same emulsifier is used as one sold at.

An apparatus of this type is characterized by an atmospheric pressure by simultaneously contacting, on the one hand, a biodegradable polymer (s) and an organic phase to be dispersed in a molten state comprising a viscosity-lowering agent, and, on the other hand, a dispersion aqueous phase comprising a stabilizer into the mixer simultaneously. And to prepare an aqueous dispersion at a flow rate of at least 100 l / h.

A second class of aqueous dispersions consisting of organic phases dispersed in a dispersible aqueous phase free of volatile organic compounds, which can be used in the preparation of high solids aqueous film-forming compositions, is directly extracted and purified from microorganisms.

Applicant has determined for the preparation of the aqueous film-forming compositions according to the invention the purification conditions of the natural granules of the biodegradable polymers with a stabilizer content, in particular a protein content of 1 to 5 by dry weight relative to the dry weight of the polymer. It was found that it is necessary to adjust to be%, preferably 1 to 4%.

This indicates that at less than 1% stabilizer, especially protein content, the aqueous dispersions of bacterial polymers generally do not show a sufficient level of stability to be incorporated as binders of aqueous film-forming compositions with high solids content. I found it.

At contents above 5%, an excessively high content of stabilizers, especially proteins, is detrimental to the adhesion properties required for the preparation of coating colorants, aqueous film-forming pigment formulations, aqueous paints or aqueous adhesive compositions.

The protein content in the natural granules of the bacterial polymer can be adjusted during the purification step by any method known per se to those skilled in the art.

Applicants are of the type using sodium hypochlorite, which is capable of digesting biomass without degrading polyhydroxyalkanoates while leaving an amount of stabilizing protein for colloidal suspensions sufficient to facilitate adhesion of natural granules. We recommend the use of purification methods.

Preferably, the solids content of the aqueous dispersion used in the preparation of the aqueous film-forming composition is 25 to 70% by weight, preferably 35 to 70% by weight, more preferably 45 to 65% by weight.

The solids content is 25 to 70% by weight, preferably 35 to 70% by weight, more preferably 45 to 65% by weight, and 95 to 99.5% based on the dry weight of the solids content comprises at least one biodegradable polymer. It is shown that an aqueous dispersion composed of an organic phase dispersed in an aqueous phase for dispersion, characterized in that it is an organic phase, and 0.5 to 5% is at least one stabilizer, is particularly suitable for the preparation of the aqueous film-forming composition according to the invention.

On the other hand, the preparation of the aqueous film-forming composition according to the present invention is accomplished by blending its components by any method known per se to the person skilled in the art, as illustrated below.

The aqueous film-forming compositions thus obtained are particularly suitable for the preparation of aqueous pigment compositions such as coating colorants, aqueous film-forming pigment preparations or paints, or aqueous adhesive compositions.

Preferably, the aqueous pigment composition according to the invention exhibits a solids content of at least 30%,

Aqueous dispersions of biodegradable polymers belonging to one of the classes defined above, as binders,

One or more adjuvants,

-And at least one pigment

It includes.

Preferably, the aqueous adhesive composition according to the invention exhibits a solids content of at least 30%,

Aqueous dispersions of biodegradable polymers belonging to one of the classes defined above, as main binders,

As secondary binders, in particular natural and modified starches, preferably dissolved in water, and polysaccharides selected from natural and modified celluloses,

-One or more supplements

And optionally at least one pigment.

The aqueous adhesive composition according to the invention can in particular be an adhesive for labeling, spiral mandrel, cardboard, bag making, wallpaper, carpets (including custom carpets), linings, nonwovens, tobacco, walls.

It may also be a textile finish, varnish, a composition for temporary protection, a composition for preventing graffiti, a coating composition or a waterproofing composition.

The aqueous adhesive composition can be easily diluted with water depending on how it is applied to the surface, or on the material to be coated or sized.

Other features and advantages of the invention will become apparent upon reading the following non-limiting examples.

Example  One

Three aqueous pigment compositions having a high solid content were prepared from three aqueous dispersions without a volatile organic solvent.

The first aqueous dispersion (dispersion 1) was prepared and sold from Galactic, having a number average molecular weight of about 68000 Da, a polydispersity of 2.78, a glass transition temperature of 55 ° C., 2380 Pa · s at 130 ° C. and 34 at 160 ° C. Prepared from Polylactate Galstick ^® L68 having a complex viscosity of Pa.s, crystallinity close to 0%, and a D-lactic acid content of 12.4% after hydrolysis.

The agonists for lowering the viscosity of the poly-lactate was used as a call belsi benzo Flex ^® (Benzoflex ^®) in (Velsicol) four diethyl glycol dibenzoate of boiling point 236 ℃ sold under the trade name 2-45.

For the aqueous phase, the selected stabilizer is 88 ± 1% hydrolysis degree, 25 ± 2 mPa · s, and 94 sold by TVP Japan Vam & Co. Ltd. It was a polyvinyl alcohol Poval JP 18Y having a purity greater than%.

The process for preparing the aqueous polylactate dispersion included the following steps.

1) Preparation of the organic phase to be dispersed:

1300 g of Galstick ^® L68 type PLA pellets and 700 g of Benzoflex ^® 2-45 (ie the ratio of biodegradable polymer and viscosity-lowering agent is 65/35) are introduced into an electric heating vessel maintained at 160 ° C. It was.

When the materials were completely melted, the blend was stirred to make it homogeneous.

2) Preparation of Dispersible Aqueous Phases:

135 g of polyvinyl alcohol foam JP 18Y was dispersed in 3200 g of deionized water at 80 ° C. under mechanical stirring.

3) Preparation of Aqueous Dispersion:

The organic phase to be dispersed and the aqueous phase for dispersion were simultaneously blended in a laboratory emulsifier sold by Emulvitium.

The organic and aqueous phases were transferred to respective thermally insulated vessels thermostated to 160 ° C and 60 ° C.

The volumetric pump was run in a closed circuit to adjust each temperature and control the flow rate to obtain 97.2% dispersed organic phase content and 2.8% stabilizer content relative to the solids content of the aqueous dispersion.

After opening the valve, the organic and aqueous phases were transferred simultaneously and continuously into an Atomix C turbomixer at 8900 rpm.

A second, third and fourth aqueous polylactate dispersion was then prepared according to the same procedure as above except for the following.

For dispersion 2, 85 g of foamed JP 18Y, 3.5 g of xanthan gum (Sigma Aldrich), and extruded acetylated potato starch prepared and sold by the applicant (AN = 1.8) 32 g was incorporated as a stabilizer.

For dispersion 3, 85 g of foamed JP 18Y, 7 g of xanthan gum (Sigma Aldrich), and 64 g of extruded acetylated potato starch (AN = 1.8) manufactured and sold by the applicant as stabilizers Incorporated.

- the case of dispersion 4, 700 g of the viscosity-lowering agent benzo Flex ^® substituting 2-45 as diisobutyl adipate in 325 g of xanthan gum in 85 g Ipoh JP 18Y, 7 g of (Sigma-Aldrich), and 64 g of extruded acetylated potato starch (AN = 1.8) prepared and sold by the applicant were incorporated as a stabilizer and the pH was adjusted to a value of 5.0 by addition of 1N sodium hydroxide.

Repeat the same preparation conditions for dispersion 1, with only 18 g of foam JP 18Y added to the first one (i.e. 0.4% stabilizer content based on dry weight of solids content) and 375 g for the second one. A test was carried out to prepare two different dispersions in which foamed JP 18Y was added (ie, the stabilizer content was 7% based on the dry weight of the solids content). In both cases, in contrast to the other four preparations, it was impossible to obtain an aqueous dispersion or to prepare an aqueous dispersion that exhibited stability over several hours (immediately coagulation).

The properties of the four stable aqueous dispersions are listed in Table I below.

Dispersion 1 Dispersion 2 Dispersion 3 Dispersion 4 Solid content (%) 59.7 59.5 57.5 46.1 Organic phase content (%) based on dry weight of solids content 97.2 97.5 96.4 94.6 Stabilizer content (%) based on dry weight of solids content 2.8 2.5 3.6 5.4 pH 2.2 2.2 2.2 5.0 Average diameter (㎛) 5.1 5.0 5.4 4.2 Brookfield viscosity at 20 ° C (mPas) 390 495 870 3200 Solidification after 2 months none none none none

Under Dispermat mechanical agitation at 5000 rpm for 2 minutes, 8 g of demineralized water and 35 g of any of the dispersions 1, 2 or 3 exhibiting the properties described in Table I above were setacarb ^® by Omya. 3 kinds of the water-based pigment composition according to the present invention (Setacarb ^®) is, the solid content sold under the brand gradually to 75% of the aqueous pigment suspension 16 g of calcium carbonate that was added was prepared.

These aqueous pigment compositions obtained from dispersions 1, 2 and 3 respectively were called PC1, PC2 and PC3. Their main features are listed in Table II below.

PC1 PC2 PC3 Solid content (%) 55.7 55.6 54.5 pH 6.4 6.6 6.5 Brookfield viscosity at 20 ° C (mPas) 2500 7200 4500

It has been found that the aqueous pigment composition obtained as above is stable in that no solidification, condensation or phase inversion is observed. In addition, these pigment compositions exhibited good film-forming properties and acceptable levels of viscosity for aqueous film-forming pigment formulations.

Further, the dispersion liquid 2 with a starting material, a hydrogenated glucose syrup poly sorbitan probe ^® stabilizer add (Polysorb ^®) 70/12/12, sold by the applicant in the dispersion 2, was added in an amount increasing By simple mixing, a new aqueous dispersion (dispersion 5 to 9) was prepared.

In dispersions 5 to 9, the amount of the syrup added to 100 g of dispersion 2 having a solid content of 59.5% by dilution with 59.5% solids, and the film-forming properties at 20 ° C and 95 ° C are shown in Table III and IV.

Dispersion 2 5 6 7 8 9 Polysorb 70/12/12 with 59.5% solids (g) 0 One 2 5 10 15 Stabilizer content (%) based on dry weight of solids content 2.5 3.5 4.5 7.5 12.5 17.5 Organic phase content (%) based on dry weight of solids content 97.5 96.5 95.5 92.5 87.5 82.5

Dispersion 2 5 6 7 8 9 Film-forming Properties at 20 ° C. (Agglomeration of Dry Film) Very good Good Good Bad Bad Very bad Film-forming Properties (Agglomeration of Dry Film) at 95 ° C. (Storbing) Very good Good Good Bad Bad Very bad Water resistance (film obtained at 95 ° C.) Very good Very good Good Bad Bad Very bad Appearance at 20 ℃ Transparency Slightly cloudy Slightly cloudy blur blur blur Appearance at 96 ℃ Transparency Very slightly cloudy Slightly cloudy blur blur blur Adhesion at 20 ℃ Good Good Good insufficiency insufficiency insufficiency Adhesion at 95 ℃ Good Good Good insufficiency insufficiency insufficiency

In fact, it is evident that a stabilizer content of 0.5 to 5% based on the dry weight of the solids content of the aqueous dispersion enables both of

Obtaining a stable aqueous dispersion which additionally exhibits good film-forming properties and good water resistance (no coagulation or solidification after several months), and

Preparation of pigment compositions that exhibit rheological properties suitable for aqueous film-forming pigment preparations and also exhibit good film-forming properties.

Example  2

As follows, a coating colorant formulation of the top coat / single coat type was prepared from Dispersion 4 of Example 1 in the following manner and compared to coating colorant formulations prepared from synthetic aqueous dispersions.

1) Formulation of "Top Coat / Single Coat" Coating Colorant from Dispersion 4 of Example 1 (Coating Colorant 1, Invention)

The following ingredients were added sequentially under Laneyri mechanical stirring for 1 hour at 700 rpm.

1115 g of an aqueous pigment suspension of calcium carbonate with a solids content of 76%, sold under the brand Setacarb ^® 80 OG by Omjasa,

- the Marys (Imerys) used in gloss Supra ^® (Supragloss ^®) water-based pigment of the kaolin, the solid content is 66% to 95 sold under the brand of the suspension 328 g,

Dispersion 4 340 g,

- the neo probe sorbitan ^® (Neosorb ^®) manufactured under the trade name of 70/70 and a polyol type are sold, the solid content is 70% by the applicant plasticizer 126 g,

- Shiva 12 g dispersant sold by (Ciba) used the brand name Di perspex ^® (Dispex ^®) N40,

- Novi, ANT (Noviant) four pin fixes ^® (Finnfix ^®) sold as 10 of a brand, a solids content of 10% of the carboxymethyl cellulose type thickener 61 g in,

- BASF (BASF) four urethane call ^® insoluble agent, a solid content of 56% sold under the brand name (Urecoll ^®) in S 10 g,

- nopko Paper Technology (Nopco Paper Technology) knobs Cote ^® (Nopcote ^®) C to 104 sold under the brand of, the solid content is 48% in the lubricant 8 g.

Solid content of the pigment composition was adjusted to 60% using deionized water. The pH of this same pigment composition was adjusted to 9 using sodium hydroxide.

The viscosity measured by the Brookfield viscometer was 620 mPa * s at 100 rpm and 30 degreeC.

The viscosity measured at a shear rate of 40,000 s ^{−1 with} a Hercules rheometer (DV-10 type model manufactured by Caltec Scientific Inc.) was 42 mPa · s.

2) Formulation of Control "Top Coat / Single Coat" Coating Colorant from Synthetic Aqueous Dispersion (Coating Colorant 2):

For a quiet fabrication, Dow (Dow) use of the pigment composition Dow ^® (Dow ^®) DL 950 that brand (solid content 50%: pH 5.7; a Brookfield viscosity of 98 mPa · s) of styrene sold by-butadiene type synthetic aqueous It was the same as the above except having substituted dispersion 4 with the dispersion.

Solid content of the pigment composition was adjusted to 60% using demineralized water. The pH of this same pigment composition was adjusted to 9 using sodium hydroxide.

The viscosity measured by the Brookfield viscometer was 580 mPa * s at 100 rpm and 30 degreeC.

The viscosity measured at a shear rate of 40,000 s ^{−1 with} a Hercules rheometer (model DV-10 manufactured by Caltec Scientific Inc.) was 24 mPa · s.

3) physical measurement of coatings and coated paper

Using a heli-coater manufactured and sold ^® (Helicoater ^®) coating apparatus of the type 2000 from the Dixon (Dixon) used the pigment composition of the two above was coated on a base paper with a basis weight (grammage) of 39 g / ㎡. Coating was carried out with blade type (blade coating).

The deposition amounts of these two pigment compositions were 19 g / m 2 for the composition containing the dispersion 4 and 18 g / m 2 for the composition containing the synthetic aqueous dispersion.

Subsequently, the paper was calendered using an experimental calendar of type RK 22 HU manufactured by Ramish & Co. (Ramisch & Co.).

The calendering step is necessary to give the coated paper a smooth and glossy appearance. Calendering conditions were one pass at 2.5 bar and 120 ° C.

The paper was analyzed after storage in a climate control chamber (23 ° C./50% RH) and the results are shown in Table V below.

Coating Colorant 1 (Invention) Coating Colorants 2 (Prior Art) Whiteness (%) 82.3 81.4 Opacity (%) 92.1 90.7 Smoothness (ml / min) 25 26 Porosity (ml / min) 9 6 Machine direction stiffness (mN) 11 13

Paper coated with a coating colorant (coating colorant 1) according to the invention, comprising dispersion 4, had the same smoothness, porosity and stiffness as compared to coating colorant (coating colorant 2) comprising a synthetic aqueous dispersion, Opacity gave better results.

Example  3

The aqueous pigment composition PC1 obtained according to Example 1 was used as the adhesive aqueous film-forming pigment formulation and compared with the control adhesive formulation.

The control adhesive formulation is

16 g of pigment suspension Cetacarb ^® 85 OG with 75% solids, sold by Omya

8 g of demineralized water,

- Rhodia (Rhodia) Inc., dibutyl adipate to as the latex corresponding to a stylized vinyl acetate plasticized by Pate Pas ^® (Rhodopass ^®) A 013P (solid content 54%, pH 4.5, viscosity 6,000 mPa · s) for sale in Was prepared by blending at 5,000 rpm for 2 minutes. This control adhesive formulation exhibited a Brookfield viscosity of 8,500 mPa · s at 20 ° C.

The adhesive binding performance of the aqueous pigment composition PC1 of Example 1 and the control formulation was compared in accordance with the FIPAGO test, which measures adhesion expression on a Strohlein apparatus.

The principle of this test is to measure the change over time in tear strength expressed by the test adhesive composition between two sheets of paper, one located on a stationary support and the other attached to a rotating arm.

The two sheets of paper are of the same quality, have dimensions of 20 cm x 6 cm and have the following main characteristics.

Basis weight: 66 g / ㎡

Cobb: 19 g / m 2

AFNOR porosity: 7.6 ml / min

Internal cohesion (Scott-Bond): 550 J / m2

A value of 100 means that the paper cannot be separated and a value of 0 means that it will be separated immediately.

At 40 g of test adhesive composition (PC1 or control formulation) deposit per square meter of paper, the FIPAGO adhesion results described in Table VI below were obtained.

Adhesive Measurement Point 10 seconds later After 30 seconds 50 seconds later Adhesive Pigment Composition According to the Invention 2 36 Defiberization of Paper Control Adhesive Formulation 24 82 Defiberization of Paper

It is evident that the adhesive pigment compositions according to the invention produce slower adhesive bonds than the control adhesive formulations but exhibit good adhesion properties.

Example  4

Two kinds of matt water-based paint and the two types of gloss to a water-based paint was prepared according to the proportion described in Table VII, styrene-acrylic binder resin Lee polrem ^® (Repolem ^®) 2423 (solid content of 50%, a Brookfield viscosity Is a latex with a 10,000 at 20 ° C., a pH of about 8, a minimum film-forming temperature of + 15 ° C., and a glass transition temperature of + 18 ° C.) Acted as.

Composition (g) Matte paint Glossy paint Demineralized water 259.7 139.0 Cellulosic thickeners (as sodium Sol ^® (Natrosol ^®) plus 430, Aqua cone (Aquacon) g) 3.7 1.0 Ammonia water (solid content 22%) 0.1 0.1 Of solid content of 50% polyurethane thickener (Core-Tex ^® (Coatex ^®) BR 100P, Core-Tex (Coatex) g) 4.2 12.8 Dispersant with 40% solids content (Coatex ^® P / 90, Coatex) 2.4 4.9 Defoamer (Nopco 8034 ^® , Henkel) 0.4 1.5 50% buy the biological solids content (actinoids site ^® (Acticide ^®) BX, ssoreu (Thor), Inc.) 1.7 2.0 White Pigment (Titanium Dioxide R960, DuPont) 77.8 222.6 Calcium carbonate pigment (wrapped around a knife ^® (Durcal ^®) S, ohm Yasawa) 84.8 40.5 Calcium Carbonate Pigment (Durcal ^® 2, Omniyasa) 424.2 60.7 Bound resin 84.9 458.1 Demineralized water 50.9 55.9 The adhesion (Tec sanol ^® (Texanol ^®), Eastman (Eastman) g) 4.3 0 Defoamer (Novco 8034 ^® , Henkel) 0.9 0.9 Ammonia water (solid content 22%) Sufficient amount to pH about 8 Sufficient amount to pH about 8

The components of the paints were incorporated in the order indicated in Table VII, using a Dispermat ^® CV brand dispersing device specially designed for paint production, following a fixed procedure.

The properties of the various matt or glossy aqueous paints are listed in Table VIII below.

Matte paint Glossy paint Repolem 2423 Control Using dispersion 1 Using dispersion 2 Repolem 2423 Control Using dispersion 1 Using dispersion 2 Solid content (%) 63.8 63.8 63.8 57.4 57.4 57.4 Brookfield Viscosity (mPas)-Initial-After 7 days   9,500 9,700   11,100 15,000   8,400 12,500   19,000 18,000   13,000 15,000   8,900 13,000 pH-initial-after 7 days  8.0 8.0  8.3 7.4  8.4 7.7  8.1 8.1  8.0 7.6  8.1 7.7 The presence of a yield point none has exist has exist none has exist has exist Measurement of flow (mm) ^* One One One One One One Dripping none none none none none none Exterior of paint film after drying Smooth, Matte Smooth, Matte Less smooth, matte Smooth, glossy Less flat, less glossy Less flat, somewhat matte Note: ^* = The gap height, measured in mm, corresponds to a pair of stripes that appear to be separated.

Dispersions 1 and 2 it is apparent that both without compromising the physical stability or the basic matte or glossy can be completely replaced with a non-biodegradable synthetic resins binding Lee polrem ^® 2423 for aqueous paint formulations.

Advantageously, it is evident that the paint comprising dispersions 1 and 2 exhibits a yield point suitable for application on the support as opposed to the control paint.

Example  5

An aqueous adhesive composition according to the present invention was prepared from an aqueous dispersion of polylactate galastic ^® L 68 free of organic solvents.

This aqueous dispersion was obtained according to the conditions described in Example 1 (dispersion 5), and included the following.

Demineralized water: 40.86%

Polyvinyl alcohol foam JP 18Y: 1.07%

Xanthan gum: 0.07%

Polylactate Galastic ^® L 68: 46.40%

Dipropylene glycol dibenzoate: 5.80%

Vegetable oil methyl ester: 5.80%

The dispersion exhibited a Brookfield viscosity of 650 mPa · s at 56% solids content.

By the applicant deksil Los ^® (Dexylose ^®) was dispersed, soluble starch, 300 g of cold water, sold under the trade name of 250 in 700 g of deionized water to prepare an aqueous adhesive composition which can be used as adhesives for cigarette adhesive or lining for It was.

After mechanical stirring for 30 minutes at 1500 rpm, 300 g of the aqueous dispersion were introduced.

The pH value was then adjusted to 3 by addition of sodium hydroxide solution.

Thus, a homogeneous adhesive having a Brookfield viscosity of 4200 mPa · s at a solid content of 35.2% was obtained.

Adhesive bonding tests conducted on a FIPAGO device showed that the highly biodegradable and repulpable adhesive can be used very well for paper lining, as the defiberization of the paper was recorded only 30 seconds later.

Claims (13)

For the preparation of an aqueous film-forming composition having a solids content of at least 30%, About solid content 94-99.5% by dry weight of an organic phase comprising at least one biodegradable polymer, and 0.5 to 6% of one or more stabilizers, Use of an aqueous dispersion consisting of an organic phase dispersed in an aqueous phase for dispersion. 2. The solid content of the aqueous film-forming composition according to claim 1, wherein the solids content of the aqueous film-forming composition is at least 35% by weight based on dry weight, preferably 45 to 99.9% by weight based on dry weight, more preferably 50 to 9% by dry weight. Use characterized in that it is 75% by weight. Use according to claim 1 or 2, characterized in that the aqueous film-forming composition is an aqueous pigment composition or an aqueous adhesive composition. 4. Use according to any one of claims 1 to 3, characterized in that the aqueous dispersion is free of volatile organic compounds. 5. The dispersed organic phase component of claim 1, wherein the dispersed organic phase component of the aqueous dispersion A solubility parameter of 15 to 28 (J · cm ⁻³ ) ^0.5 , preferably 16 to 23 (J · cm ⁻³ ) ^0.5 , more preferably 18 to 21 (J · cm ⁻³ ) ^0.5 , and a hydrogen bond The parameter δH is at least one viscosity of 3.5 to 15 (J · cm ⁻³ ) ^0.5 , preferably 4 to 13 (J · cm ⁻³ ) ^0.5 , more preferably 5 to 10 (J · cm ⁻³ ) ^0.5 . -Lowering agent, and At least one biodegradable polymer having a weight ratio of polymer / viscosity-lowering agent of 99.8 / 0.2 to 60/40, preferably 97/3 to 70/30, more preferably 92/8 to 70/30 Use comprising a. The use according to any one of claims 1 to 4, characterized in that the aqueous dispersion is of bacteriostatic origin and the stabilizer is 1 to 5%, preferably 1 to 4%. The aqueous dispersion according to claim 1, wherein the aqueous dispersion is an amorphous biodegradable polymer, preferably polylactate (or PLA), polymaleate (or PMA), polyhydroxyalkanoate ( Or PHA), polycaprolactone (or PCL), polyesteramide (PEA), aliphatic copolyester (PBSA) and aliphatic-co-terephthalate copolyester (PBAT), and highly acetylated or fixed fatty chains In the group consisting of cellulose or starch made hydrophobic by introducing alone or in combination, it is selected in the form of linear, branched, crosslinked, dendrimer type or grafted homopolymer or heteropolymer. 8. The method according to claim 1, wherein the stabilizers are alone or in combination in their natural or modified form from the group consisting of proteins, starches, polyvinyl alcohols, gums, polymeric emulsifiers, celluloses and polyols. Use, characterized in that the selected. Use according to any of the preceding claims, characterized in that the obtained aqueous film-forming composition is for the production of pigment coating colorants, aqueous film-forming pigment preparations and water paints. The aqueous film-forming composition of claim 1, wherein the aqueous film-forming composition is an aqueous adhesive composition, in particular labeling, spiral mandrel, corrugated cardboard, bag making, wallpaper, carpet (including custom carpets), lining , Nonwovens, tobacco, adhesives for walls, textile finishes, varnishes, compositions for temporary protection, anti-scribing compositions, coating compositions or waterproofing compositions. The solids content is from 25 to 70% by weight, preferably from 35 to 70% by weight, more preferably from 45 to 65% by weight, In an aqueous phase for dispersion, characterized in that it comprises 95 to 99.5% (by dry weight) of an organic phase comprising at least one biodegradable polymer, and 0.5 to 5% of at least one stabilizer relative to the solids content An aqueous dispersion consisting of a dispersed organic phase. An aqueous pigment composition comprising the aqueous dispersion of claim 11. An aqueous adhesive composition comprising the aqueous dispersion of claim 11.