EP3600643A1 - Procédé de préparation de capsules comprenant au moins un composé volatile et capsules obtenues - Google Patents
Procédé de préparation de capsules comprenant au moins un composé volatile et capsules obtenuesInfo
- Publication number
- EP3600643A1 EP3600643A1 EP18711369.1A EP18711369A EP3600643A1 EP 3600643 A1 EP3600643 A1 EP 3600643A1 EP 18711369 A EP18711369 A EP 18711369A EP 3600643 A1 EP3600643 A1 EP 3600643A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- composition
- emulsion
- temperature
- solid
- preparation process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- 239000004009 herbicide Substances 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- PYGSKMBEVAICCR-UHFFFAOYSA-N hexa-1,5-diene Chemical group C=CCCC=C PYGSKMBEVAICCR-UHFFFAOYSA-N 0.000 description 1
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- PMKGJTOCRFPWSS-UHFFFAOYSA-N n-[(1,3-dioxoisoindol-2-yl)methyl]prop-2-enamide Chemical compound C1=CC=C2C(=O)N(CNC(=O)C=C)C(=O)C2=C1 PMKGJTOCRFPWSS-UHFFFAOYSA-N 0.000 description 1
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- 239000000123 paper Substances 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
- 235000010987 pectin Nutrition 0.000 description 1
- 229920001277 pectin Polymers 0.000 description 1
- YKNWIILGEFFOPE-UHFFFAOYSA-N pentacosane Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCC YKNWIILGEFFOPE-UHFFFAOYSA-N 0.000 description 1
- 229920011301 perfluoro alkoxyl alkane Polymers 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
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- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
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- 239000010452 phosphate Substances 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- 229910052615 phyllosilicate Inorganic materials 0.000 description 1
- 229920003190 poly( p-benzamide) Polymers 0.000 description 1
- 229920003197 poly( p-chlorostyrene) Polymers 0.000 description 1
- 229920003196 poly(1,3-dioxolane) Polymers 0.000 description 1
- 229920002863 poly(1,4-phenylene oxide) polymer Polymers 0.000 description 1
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- 229920000075 poly(4-vinylpyridine) Polymers 0.000 description 1
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- 229920000191 poly(N-vinyl pyrrolidone) Polymers 0.000 description 1
- 229920013655 poly(bisphenol-A sulfone) Polymers 0.000 description 1
- 229920001490 poly(butyl methacrylate) polymer Polymers 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920003201 poly(di-n-hexylsilylene) polymer Polymers 0.000 description 1
- 229920003206 poly(di-n-propylsiloxane) Polymers 0.000 description 1
- 229920001643 poly(ether ketone) Polymers 0.000 description 1
- 229920000205 poly(isobutyl methacrylate) Polymers 0.000 description 1
- 229920000889 poly(m-phenylene isophthalamide) Polymers 0.000 description 1
- 229920003217 poly(methylsilsesquioxane) Polymers 0.000 description 1
- 229920003195 poly(n-butyl isocyanate) Polymers 0.000 description 1
- 229920003255 poly(phenylsilsesquioxane) Polymers 0.000 description 1
- 229920003224 poly(trimethylene oxide) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
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- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 description 1
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- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920001289 polyvinyl ether Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- ARJOQCYCJMAIFR-UHFFFAOYSA-N prop-2-enoyl prop-2-enoate Chemical compound C=CC(=O)OC(=O)C=C ARJOQCYCJMAIFR-UHFFFAOYSA-N 0.000 description 1
- FBCQUCJYYPMKRO-UHFFFAOYSA-N prop-2-enyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC=C FBCQUCJYYPMKRO-UHFFFAOYSA-N 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- 239000011347 resin Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229910000275 saponite Inorganic materials 0.000 description 1
- 229910000276 sauconite Inorganic materials 0.000 description 1
- 150000003333 secondary alcohols Chemical class 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 235000011071 sorbitan monopalmitate Nutrition 0.000 description 1
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- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 229950003429 sorbitan palmitate Drugs 0.000 description 1
- 229950011392 sorbitan stearate Drugs 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229920000638 styrene acrylonitrile Polymers 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- QCKKBOHAYRLMQP-UHFFFAOYSA-N tris[(2-methylpropan-2-yl)oxy]silane Chemical compound CC(C)(C)O[SiH](OC(C)(C)C)OC(C)(C)C QCKKBOHAYRLMQP-UHFFFAOYSA-N 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000000341 volatile oil Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 239000002888 zwitterionic surfactant Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/06—Making microcapsules or microballoons by phase separation
- B01J13/14—Polymerisation; cross-linking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/06—Making microcapsules or microballoons by phase separation
- B01J13/14—Polymerisation; cross-linking
- B01J13/18—In situ polymerisation with all reactants being present in the same phase
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
- C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
Definitions
- the present invention relates to a method for preparing capsules comprising at least one volatile compound. It also relates to the capsules as obtained and compositions containing them.
- capsules have been developed in order to protect and / or isolate active ingredients in the formulated products, and in particular volatile compounds. These capsules result from manufacturing processes such as spray-drying, interfacial polymerization, interfacial precipitation or solvent evaporation among many others.
- the diffusion time of volatile compounds through the capsule-forming materials made by most of these methods remains very short, resulting in very rapid leakage of the capsules.
- the life of the odorant properties of the formulated product that contains them is not significantly longer.
- the difficulty of providing a truly effective barrier to the diffusion of volatile compounds means that, to date, there is no capsule with satisfactory protection and retention properties of these volatile compounds. In other words, the development of capsules with improved protection and retention properties of volatile compounds remains a constant goal.
- the present invention therefore aims to provide a method for encapsulating volatile compounds, or very volatile, and avoiding the aforementioned drawbacks.
- the present invention also aims to provide a double emulsion encapsulation process for obtaining controlled size capsules, in particular of size less than 20 ⁇ , or even 5 ⁇ .
- the present invention also aims to provide capsules containing at least one volatile compound, or very volatile, with excellent retention capacity.
- the present invention also aims to provide capsules containing at least one volatile compound, or very volatile, limiting the diffusion of chemical species capable of degrading said volatile compounds and thus protect the volatile compounds from degradation.
- the present invention also aims to improve the performance of formulated products containing highly volatile compounds by providing capsules having an effective barrier to their evaporation and protection against degradation.
- the present invention relates to a method for preparing solid microcapsules comprising the following steps:
- composition C1 which is either a composition C1a, comprising a single hydrophobic solid particle, or a composition C1b comprising a plurality of hydrophobic solid particles dispersed in a hydrophilic phase
- hydrophobic solid particle (s) containing one or more lipophilic volatile compounds and one or more hydrophobic materials, solid at room temperature and liquid at a temperature greater than T m ,
- the temperature T b being greater than T m when the composition C1 is a composition C1 a and the temperature T b being less than T m when the composition C1 is a composition C1 b
- the composition C2 comprising at least one monomer or polymer, at least one crosslinking agent, and optionally at least one (photo) initiator or crosslinking catalyst
- the viscosity of the composition C2 being between 500 mPa.s and 100 000 mPa.s at 25 ° C., and preferably being greater than the viscosity of the composition C1,
- the temperature T c being greater than T m when the emulsion (E1) comprises drops of composition C1a dispersed in composition C2 and the temperature T c being less than T m when the emulsion (E1) comprises drops of composition C1 b dispersed in the composition C2,
- the viscosity of the composition C3 being between 500 mPa.s and 100 000 mPa.s at 25 ° C, and preferably being greater than the viscosity of the emulsion (E1),
- the method of the invention thus makes it possible to prepare solid microcapsules comprising a core and a solid envelope completely encapsulating at its periphery the core, in which the core is a composition C1 comprising at least one hydrophobic solid particle containing one or more volatile lipophilic compounds.
- the capsules of the invention have excellent retention capacities of volatile compounds they contain through several mechanisms to reduce or even eliminate their evaporation:
- the heart of the capsules contains a material or a mixture of materials in which the volatile compounds are soluble.
- the volatile compounds thus have a high affinity for this material, which greatly limits their volatile character.
- the heart of the capsules contains more than one particle, they are dispersed in a hydrophilic phase in which the solubility of the volatile compounds is negligible. This makes it possible to contain the volatile compounds in the particles and to prevent their diffusion towards the outside of the capsules.
- the polymer forming the rigid envelope of the capsules advantageously limits the diffusion of the chemical species through this envelope, in particular the diffusion of the volatile compounds towards the outside of the capsules.
- the polymer forming the rigid envelope of the capsules also advantageously limits the diffusion (or penetration) of chemical species capable of degrading the volatile compounds through this envelope, thus protecting the volatile compounds from degradation.
- the process of the invention consists in producing a double emulsion composed of droplets containing the particles of volatile compounds enveloped in a crosslinkable liquid phase. These double drops are then rendered monodisperse in size before being converted by crosslinking or polymerization in rigid capsules.
- the preparation involves 5 steps described below in detail.
- Stage a) of the process according to the invention consists in preparing a composition C1 comprising at least one hydrophobic solid particle containing at least one volatile lipophilic compound.
- step a) comprises a step of heating the hydrophobic material (s) at a temperature greater than T m , followed by a step of adding the one or more lipophilic volatile compounds, and a step of mixing the assembly at a temperature greater than T m .
- composition C1a the hydrophobic material or the mixture of hydrophobic materials for forming the particles is heated above T m .
- the volatile compounds are then added and the mixture formed is stirred while maintaining the temperature above T m .
- step a) further comprises a step of dispersing the composition C1a in a hydrophilic phase optionally further comprising at least one dispersing agent and / or at least one gelling agent, followed by a cooling step of the dispersion thus obtained at a temperature below T m , whereby hydrophobic solid particles dispersed in said hydrophilic phase are obtained.
- the C.sub.1a mixture is dispersed in a hydrophilic phase immiscible with C.sub.1a, preferably in the presence of at least one dispersing agent and / or at least one gelling agent. as described below.
- the emulsion obtained is then cooled below T m in order to make the particles of volatile compounds solid.
- composition C1 according to the invention comprises at least one hydrophobic solid particle, said particle containing at least one volatile lipophilic compound and at least one hydrophobic material, solid at room temperature and liquid at a temperature greater than T m .
- the composition C1 comprises a single hydrophobic solid particle. This one is named C1 a.
- the composition C1 comprises a plurality of hydrophobic solid particles which are then dispersed in a hydrophilic phase.
- a composition is named C1 b.
- the composition C1 b thus corresponds to the dispersion of a composition C1 a in a hydrophilic phase.
- the hydrophobic solid particle (s) according to the invention contain one or more volatile lipophilic compounds and one or more hydrophobic materials which are solid at room temperature and which are liquid at a temperature greater than T m ,
- composition C1 according to the invention comprises at least one volatile lipophilic compound. It may also include a mixture of several volatile compounds.
- volatile compound is meant a compound capable of evaporating in less than one hour at ambient temperature (25 ° C.) and atmospheric pressure (760 mmHg).
- a volatile compound according to the invention is therefore liquid at ambient temperature, in particular having a non-zero vapor pressure, at ambient temperature and atmospheric pressure, in particular having a vapor pressure ranging from 0.13 Pa to 40 000 Pa (10 ⁇ 3 to 300 mm Hg), and preferably ranging from 1.3 Pa to 13 000 Pa (0.01 to 100 mm Hg), and preferably ranging from 1.3 Pa to
- the evaporation rate of a volatile compound according to the invention can be evaluated in particular by means of the protocol described in the international application WO2006 / 013413, and more particularly by means of the protocol described below.
- the liquid is allowed to evaporate freely, without stirring, providing ventilation by a fan (PAPST-MOTOREN, reference 8550 N, rotating to
- the mass of volatile compound remaining in the crystallizer is measured at regular intervals of time.
- the evaporation profile of the volatile compound is then obtained by plotting the curve of the amount of product evaporated (in mg / cm 2 ) as a function of time (in min). Then we calculate the evaporation rate that corresponds to the tangent to the origin of the curve obtained. The evaporation rates are expressed in mg of volatile compound evaporated per unit area (cm 2 ) and per unit of time (minute).
- the volatile compounds are lipophilic, which are thus miscible in the hydrophobic material, in particular the waxes / butters and immiscible in the hydrophilic phase, when present, in which the particles are suspended.
- the volatile lipophilic compound may be a single compound or a mixture comprising any volatile lipophilic compound that can be used within the meaning of the invention.
- the volatile lipophilic compounds are chosen from perfuming agents, flavonoids, polyunsaturated fatty acids, and mixtures thereof.
- the volatile lipophilic compound may be in the form of a mixture.
- the volatile lipophilic compound according to the invention may comprise a single perfuming agent (or single perfume) or a mixture of several perfuming agents (or a mixture of several perfumes).
- perfumes or fragrances are well known to those skilled in the art and include, in particular, those mentioned, for example, in S. Arctander, Perfume and Flavor Chemicals (Montclair, NJ, 1969), S. Arctander, Perfume and Flavor Materials of Natural Origin (Elizabeth, NJ, 1960), in the International Fragrance Association's list (IFRA http://www.ifraorg.org/en/ingredients) and in "Flavor and Fragrance Materials," 1991 (Allured Publishing Co. Wheaton, III, USA).
- the perfumes used in the context of the present invention may comprise natural products such as extracts, essential oils, absolutes, resinoids, resins, concretes, etc., as well as basic synthetic substances such as hydrocarbons, alcohols, aldehydes, ketones, ethers, acids, esters, acetals, ketals, nitriles, etc., including saturated and unsaturated compounds, aliphatic, alicyclic and heterocyclic compounds.
- the perfuming agent comprises less than 10% or even less than 7.5%, by weight of compound (s) with a ClogP less than 2.1, relative to the total weight of said perfuming agent. According to one embodiment, the perfuming agent does not comprise a compound with a ClogP less than 2.1.
- the volatile lipophilic compounds are chosen from organic solvents such as saturated and unsaturated, halogenated and non-halogenated, linear, branched and cyclic aliphatic hydrocarbons; halogenated and non-halogenated aromatic hydrocarbons; alcohols; glycols such as ethylene glycol, propylene glycol and their derivatives; ketones such as acetone, butanone or methyl isobutyl ketone; esters; linear and cyclic, aliphatic and aromatic ethers, such as methyl t-butyl ether or tetrahydrofuran; glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether,
- the volatile lipophilic compounds are chosen from flame retardants or flame retardants such as brominated compounds, for example decabromodiphenyl ethers, hexabromocyclododecanes, brominated epoxide oligomers; phosphorus compounds, for example alkyl phosphates, aryl phosphates, bisaryl phosphates; short- and medium-chain chloroparaffins (containing up to about 25 carbon atoms).
- flame retardants or flame retardants such as brominated compounds, for example decabromodiphenyl ethers, hexabromocyclododecanes, brominated epoxide oligomers
- phosphorus compounds for example alkyl phosphates, aryl phosphates, bisaryl phosphates
- short- and medium-chain chloroparaffins containing up to about 25 carbon atoms.
- the content by weight of volatile compounds is between 50% and 99%, preferably between 70% and 98%, relative to the weight of the composition C1 a.
- the composition C1a when the composition C1 is a composition C1b, the composition C1a represents between 20% and 70% of the weight of C1b.
- the weight of volatile compounds then represents between 10% and 69.3% of the weight of C1b, preferably between 14% and 68.6%.
- the heart of the capsules represents between 20% and 70% of the weight of the capsules.
- the weight of volatile compounds therefore represents between 10% and 69.3% (preferably between 14% and 68.6%) of the weight of the capsules for capsules whose heart is formed by a composition C1 a (a single particle), or between 2% and 48.5% (preferably between 2.8% and 48%) of the weight of the capsules for capsules whose core is formed by a composition C1 b (dispersion of several particles).
- the hydrophobic particles of the composition C1 according to the invention contain at least one hydrophobic material.
- said hydrophobic material is a solid compound at ambient temperature and liquid at a temperature T greater than T m .
- T m is between 30 ° C and 80 ° C, and preferably between 35 ° C and 55 ° C.
- the hydrophobic material or materials are chosen from waxes, butters or pasty fatty substances, and mixtures thereof.
- the term "wax” means a lipophilic compound, solid at room temperature (25 ° C.), with reversible solid / liquid state change, having a melting point greater than or equal to 30 ° C. up to 120 ° C, preferably 80 ° C.
- the waxes that may be used according to the invention may be chosen from waxes, solid, deformable or not at room temperature, of animal, vegetable, mineral or synthetic origin, and mixtures thereof.
- hydrocarbon-based waxes such as beeswax, lanolin wax, and Chinese insect waxes; rice wax, Carnauba wax, Candelilla wax, Ouricurry wax, Alfa wax, cork fiber wax, sugar cane wax, Japanese wax and sumac wax ; montan wax, microcrystalline waxes, paraffins and ozokerite; polyethylene waxes, waxes obtained by Fisher-Tropsch synthesis and waxy copolymers and their esters.
- Polyvinyl ether waxes waxes based on cetyl palmitate, glycerol ester and fatty acid waxes, ethylene copolymer waxes, oxidized polyethylene waxes, ethylene homopolymer waxes, polyethylene, polyether waxes, copolymer waxes ethylene / vinyl acetate and polypropylene waxes, the waxes sold under the names Kahlwax®2039 (INCI name: Candelilla cera) and Kahlwax®6607 (INCI name: Helianthus Annuus Seed Wax) by the company Kahl Wachsraffinerie, Casid HSA (INCI name: Hydroxystearic Acid) by SACI CFPA, Performa®260 (INCI name: Synthetic wax) and Performa®103 (INCI name: Synthetic wax) by New Phase, and AJK-CE2046 (INCI name: Cetearyl alcohol, dibutyl lauroyl glutamide , dibut
- waxes obtained by catalytic hydrogenation of animal or vegetable oils having linear or branched C 8 -C 32 fatty chains.
- hydrogenated jojoba oil hydrogenated sunflower oil, hydrogenated castor oil, hydrogenated coconut oil and hydrogenated lanolin oil
- di-tetrastearate trimethylol-1, 1, 1 propane
- HEST 2T-4S di-tetrastearate sold under the name "HEST 2T-4S” by the company HETERENE
- di- (trimethylol-1, 1, 1 propane) tetraprenate sold under the name HEST 2T-4B by the company HETERENE.
- waxes obtained by transesterification and hydrogenation of vegetable oils, such as castor oil or olive oil, such as waxes sold under the names Phytowax ricin 16L64 and 22L73 ® ® and Phytowax Olive 18L57 by the company Sophim. Such waxes are described in application FR-A-2792190.
- hydrocarbons n-alkanes, branched alkanes, olefins, cyclic alkanes, isoprenoids
- ketones monocetones, ⁇ -diketones
- secondary alcohols alkanediols ( alkane-1,2-diols, alkane-2,3-diols, alkane- ⁇ , o-diols), acids (alkenoic acid and alkanoic acid), ester waxes (primary alcohol esters and secondary alcohol esters) ), the diester waxes (alkanediol diesters, hydroxyl acid diesters), the triesterglycerols, triesters of alkane-1,2-diol, ⁇ -hydroxy acid and fatty acid, esters of hydroxymalonic acid, fatty acid and alcohol, triesters of hydroxyl acids, fatty acid and fatty alcohol, triesters of hydroxyl acids, fatty acid and fatty alcohol, tries
- n-octacosan n-heptacosane, n-hexacosane, n-pentacosan, n-tetracosane, n-tricosane, n-docosan, n-heneicosane and n-eicosane may be mentioned.
- n-nonadecane myristyl alcohol, pentadecyl alcohol, cetyl alcohol, palmitoleyl alcohol, heptadecyl alcohol, stearyl alcohol, nonadecyl alcohol, arachidyl alcohol, henicosyl alcohol, behenyl alcohol, erucyl alcohol, lignocyl alcohol, ceryl alcohol, 1-heptacosanol, montanyl alcohol, cluytyl alcohol, 1-octacosanol, 1-nonacosanol, myricylic alcohol, melissyl alcohol, 1-triacontanol and 1-dtriacontanol.
- fatty acids that can be used as waxes in the context of the invention are, for example, cerotic acid, palmitic acid, stearic acid, behenic acid, lignoceric acid, arachidic acid, myristic acid, lauric acid, tridecyclic acid, pentadecyclic acid, margaric acid, nonadecyclic acid, henicosylic acid, tricosylic acid, pentacosylic acid, heptacosylic acid, montanic acid, and nonacosylic acid.
- fatty acid esters which can be used as waxes in the context of the invention are, for example, cetyl palmitate, cetyl octanoate, cetyl laurate, cetyl lactate, cetyl isononanoate, cetyl stearate, stearyl stearate, myristyl stearate, cetyl myristate, isocetyl stearate, glyceryl trimyristate, glyceryl tripalmitate, glyceryl monostearate and glyceryl and cetyl palmitate.
- silicone waxes which may advantageously be substituted polysiloxanes, preferably at a low melting point.
- the silicone waxes that may be used may also be alkyl or alkoxydimethicones such as the following commercial products: Abilwax 2428, 2434 and 2440 (GOLDSCHMIDT), or VP 1622 and VP 1621 (WACKER), as well as (C 2 o C 6 o) alkyldimethicones , in particular the (C30-C45) alkyldimethicones, such as the silicone wax sold under the name SF-1642 by the company GE-Bayer Silicones.
- alkyl or alkoxydimethicones such as the following commercial products: Abilwax 2428, 2434 and 2440 (GOLDSCHMIDT), or VP 1622 and VP 1621 (WACKER), as well as (C 2 o C 6 o) alkyldimethicones , in particular the (C30-C45) alkyldimethicones, such as the silicone wax sold under the name SF-1642 by the company GE-Bayer
- hydrocarbon waxes modified with silicone or fluorinated groups such as, for example, siliconyl candelilla, siliconyl beeswax and Fluorobeeswax by Koster Keunen.
- the waxes may also be chosen from fluorinated waxes.
- the term “butter” (also referred to as "pasty fatty substance”) is intended to mean a lipophilic fat compound with a reversible solid / liquid state change and comprising at a temperature of 25 ° C. a liquid fraction. and a solid fraction, and at atmospheric pressure (760 mm Hg).
- the starting melting temperature of the pasty compound may be less than 25 ° C.
- the liquid fraction of the pasty compound measured at 25 ° C. may represent from 9% to 97% by weight of the compound. This liquid fraction at 25 ° C is preferably between 15% and 85%, more preferably between 40% and 85% by weight.
- the one or more butters have an end-of-melting temperature of less than 60 ° C.
- the one or more butters have a hardness less than or equal to 6 MPa.
- the butters or pasty fatty substances have in the solid state an anisotropic crystalline organization, visible by X-ray observations.
- the melting temperature corresponds to the temperature of the most endothermic peak observed in thermal analysis (DSC) as described in the ISO 1 1357-3 standard; 1999.
- the melting point of a paste or a wax can be measured using a differential scanning calorimeter (DSC), for example the calorimeter sold under the name "DSC Q2000" by the company TA Instruments .
- DSC differential scanning calorimeter
- sample preparation and measurement protocols are as follows: A sample of 5 mg of pasty fatty substance (or butter) or wax previously heated at 80 ° C. and taken with magnetic stirring using an equally heated spatula is placed in an airtight aluminum capsule or crucible. Two tests are carried out to ensure the reproducibility of the results.
- the measurements are carried out on the calorimeter mentioned above.
- the oven is subjected to a nitrogen sweep.
- the cooling is ensured by the RCS 90 heat exchanger.
- the sample is then subjected to the following protocol, first being brought to a temperature of 20 ° C and then subjected to a first temperature rise ranging from 20 ° C to 80 ° C. ° C, at the heating rate of 5 ° C / minute, then cooled from 80 ° C to -80 ° C at a cooling rate of 5 ° C / minute and finally subjected to a second temperature rise from - 80 ° C to 80 ° C at a heating rate of 5 ° C / minute.
- the variation of the power difference absorbed by the empty crucible and the crucible containing the butter sample is measured as a function of temperature.
- the melting point of the compound is the value of the temperature corresponding to the peak apex of the curve representing the variation of the power difference absorbed as a function of temperature.
- the end of melting temperature corresponds to the temperature at which 95% of the sample melted.
- the liquid fraction by weight of the butter (or pasty fatty substance) at 25 ° C. is equal to the ratio of the heat of fusion consumed at 25 ° C. on the enthalpy of melting of the butter.
- the enthalpy of melting of the butter or pasty compound is the enthalpy consumed by the compound to pass from the solid state to the liquid state.
- the butter is said to be in the solid state when the entirety of its mass is in crystalline solid form.
- the butter is said to be in the liquid state when the entirety of its mass is in liquid form.
- the melting enthalpy of the butter is equal to the integral of the whole of the melting curve obtained with the aid of the calorimeter evoked, with a rise in temperature of 5 ° C. or 10 ° C. per minute, according to the standard ISO 1,1357-3: 1999.
- the melting enthalpy of the butter is the amount of energy required to pass the compound from the solid state to the liquid state. It is expressed in J / g.
- the enthalpy of fusion consumed at 25 ° C is the amount of energy absorbed by the sample to change from the solid state to the state it has at 25 ° C consisting of a liquid fraction and a solid fraction.
- the liquid fraction of the butter measured at 32 ° C preferably represents from 30% to 100% by weight of the compound, preferably from 50% to 100%, more preferably from 60% to 100% by weight of the compound.
- the temperature of the end of the melting range of the pasty compound is less than or equal to 32 ° C.
- the liquid fraction of the butter measured at 32 ° C. is equal to the ratio of the enthalpy of fusion consumed at 32 ° C. on the enthalpy of melting of the butter.
- the enthalpy of fusion consumed at 32 ° C. is calculated in the same way as the heat of fusion consumed at 23 ° C.
- the sample preparation and measurement protocols are as follows: the butter is placed in a 75 mm diameter mold that is about 75% full. In order to overcome the thermal past and control the crystallization, the mold is placed in the Vôtsch VC0018 programmable oven where it is first heated to 80 ° C for 60 minutes, then cooled from 80 ° C to 0 ° C at a cooling rate of 5 ° C / minute, then left at the stabilized temperature of 0 ° C for 60 minutes, then subjected to a temperature rise from 0 ° C to 20 ° C, at a rate of heat of 5 ° C / minute, then left at the stabilized temperature of 20 ° C for 180 minutes.
- the compression force measurement is performed with Swantech TA / TX2i texturometer.
- the mobile used is chosen according to the texture: - mobile cylindrical steel 2 mm diameter for raw materials very rigid; - Cylindrical 12 mm diameter steel for rigid raw materials.
- the measurement comprises 3 steps: a first step after automatic detection of the surface of the sample where the mobile moves at a measuring speed of 0.1 mm / s, and penetrates the butter at a depth of penetration of 0 , 3 mm, the software notes the value of the maximum force reached; a second so-called relaxation stage where the mobile stays at this position for one second and where the force is noted after 1 second of relaxation; finally a third so-called withdrawal step where the mobile returns to its initial position at the speed of 1 mm / s and the energy of withdrawal of the probe (negative force) is recorded.
- the value of the hardness measured in the first step corresponds to the maximum compression force measured in Newton divided by the surface area of the texturometer cylinder expressed in mm 2 in contact with the butter or emulsion according to the invention.
- the value of hardness obtained is expressed in mega-pascals or MPa.
- the pasty fatty substance or butter may be chosen from synthetic compounds and compounds of plant origin.
- a pasty fatty substance can be obtained synthetically from starting materials of plant origin.
- lanolin and its derivatives such as lanolin alcohol, oxyethylenated lanolins, acetylated lanolin, lanolin esters such as isopropyl lanolate, oxypropylenated lanolines,
- polymeric or non-polymeric silicone compounds such as polydimethylsiloxanes of high molecular weight, polydimethylsiloxanes with side chains of the alkyl or alkoxy type having from 8 to 24 carbon atoms, especially stearyl dimethicones,
- linear or branched oligomers homo or copolymers of alkyl (meth) acrylates preferably having a C 8 -C 30 alkyl group,
- the homo- and copolymer oligomers of vinyl ethers having C 8 -C 3 alkyl groups the liposoluble polyethers resulting from the polyetherification between one or more C 2 -C 0 0 diols, preferably C 2 -C 5 o diols,
- the particular butter or butters are of plant origin such as those described in Ullmann's Encyclopedia of Industrial Chemistry ("Fats and Fatty Oils", A. Thomas, published on 15/06/2000, D01 : 10.1002 / 14356007.a10_173, point 13.2.2.2F, Shea Butter, Borneo Tallow, and Related Fats (Vegetable Butters).
- C10-C18 triglycerides having at a temperature of 25 ° C and at atmospheric pressure (760 mm Hg) a liquid fraction and a solid fraction, shea butter, Nilotica Shea butter (Butyrospermum parkii), Galam butter (Butyrospermum parkii), Borneo butter or fat or Tengkawang tallow) (Shorea stenoptera), Shorea butter, Illipé butter, Madhuca butter or Bassia Madhuca longifolia, mowrah butter (Madhuca Latifolia), Katiau butter (Madhuca mottleyana), Phulwara butter (M.
- C10-C18 triglycerides having at a temperature of 25 ° C and at atmospheric pressure (760 mm Hg) a liquid fraction and a solid fraction
- shea butter Nilotica Shea butter (Butyrospermum parkii), Galam butter (Butyrospermum parkii), Borneo butter or fat or Teng
- the content by weight of hydrophobic materials is between 1% and 50%, preferably between 2% and 30%, relative to the composition of composition C1 a.
- the composition C1a represents between 20% and 70% of the weight of C1b.
- the content by weight of hydrophobic materials is therefore between 0.2% and 35%, preferably between 0.4% and 21%, relative to the weight of composition C1b.
- composition C1 is a composition C1b, it comprises a hydrophilic phase in which the above-mentioned hydrophobic solid particles are dispersed.
- the hydrophilic phase of C1b comprises at least one dispersing agent and / or at least one gelling agent.
- said hydrophilic phase contains between 1% and 10%, preferably between 2% and 6%, by weight of one or more gelling agents and between 1% and 10%, preferably between 1% and 4%, in weight of one or more dispersing agent (s) relative to the weight of said hydrophilic phase.
- the aforementioned hydrophilic phase may further comprise at least one dispersing agent, different from the gelling agent below.
- the dispersing agent is preferably selected from the group consisting of polyacrylates; sugar / polysaccharide esters and fatty acid (s), in particular esters of dextrin and fatty acid (s), esters of inulin and fatty acid (s) or esters of glycerol and of 'Fatty acids ; polyamides; polyethers and polyesters of silicone; ethoxylated alcohols; and their mixtures.
- the dispersing agent is a surfactant which may be selected from the group consisting of nonionic surfactants, anionic surfactants, amphoteric or zwitterionic surfactants and mixtures thereof, preferably nonionic surfactants.
- a surfactant that can be used in the present invention is a nonionic surfactant chosen from sorbitan fatty acid esters and their oxyethylenated derivatives, such as sorbitan monostearate (CTFA name: Sorbitan stearate) sold by ICI under the name Span 60, sorbitan monopalmitate (CTFA name: Sorbitan palmitate) sold by ICI under the name Span 40, sorbitan stearates, palmitates and oleates oxyethylenated (CTFA name: Polysorbate) sold by ICI under the names Tween, including Polysorbate 60 (Tween 60), Polysorbate 65 (Tween 65), Polysorbate 80 (Tween 80).
- the aforementioned hydrophilic phase may further comprise at least one gelling agent, different from the dispersing agent described above.
- the gelling agent contributes to increasing the viscosity of the hydrophilic phase, and therefore of the composition C1b, which advantageously ensures the kinetic stability of the composition C1 b, thus preventing the risk of phase shift during the duration of the process of manufacturing. Also, the relatively high viscosity of the composition C1b ensures the stability of the emulsion (E1) obtained at the end of step b).
- the gelling agent is chosen from branched polymers, preferably with a molecular weight greater than 5,000 g. mol “1 , polymers of molecular weight greater than 5000 g. mol “ 1 , and mixtures thereof. These gelling agents are described in more detail below.
- the gelling agent is a branched polymer, preferably with a molecular weight greater than 5,000 g. mol "1, preferably between 10 000 g. mol” 1 and 500 000 g. mol “1 , for example between 50,000 g mol -1 and 300,000 g. mol "1 .
- the gelling agent is a polymer with a molecular weight greater than 5,000 g. mol "1, preferably between 10 000 g. mol” 1 and 500 000 g. mol "1 , for example between 50,000 g mol -1 and 300,000 g. mol "1 .
- the gelling agent is chosen from cellulose derivatives, polyacrylates, polyurethanes and their derivatives, polyethers and their derivatives, polyacrylamides, polyvinylpyrrolidone (PVP) and its derivatives, polyvinyl alcohol. (PVA) and its derivatives, poly (ethylene glycol), poly (propylene glycol) and their derivatives, polysaccharides, protein derivatives, fatty acid salts, glycerol derivatives, glycoluril derivatives and mixtures thereof .
- PVP polyvinylpyrrolidone
- PVA polyvinyl alcohol
- poly (ethylene glycol) poly (ethylene glycol), poly (propylene glycol) and their derivatives, polysaccharides, protein derivatives, fatty acid salts, glycerol derivatives, glycoluril derivatives and mixtures thereof .
- hydrophilic or water-soluble gelling agents in view of their implementation in the hydrophilic phase. This selection is a general knowledge of the skilled person.
- the hydrophilic phase represents between 30% and 80% by weight relative to the weight of C1 b.
- the heart of the capsules represents between 20% and 70% of the weight of the capsules.
- the hydrophilic phase therefore preferably represents between 6% and 56% of the weight of the capsules.
- the composition C1b comprises from 30% to 80% by weight of hydrophilic phase and from 20% to 70% by weight of hydrophobic particles relative to the total weight of composition C1b.
- Step b) of the process according to the invention consists in preparing a first emulsion (E1).
- the first emulsion consists of a dispersion of droplets of composition C1a (respectively C1b) in a polymeric composition C2 immiscible with C1a (respectively C1b), created by dropwise addition of C1a (respectively C1b) in C2 with stirring.
- the composition C1 is at a temperature of between 0 ° C. and 100 ° C., preferably between 10 ° C. and 80 ° C., and preferably between 15 ° C. and 60 ° C.
- the composition C2 is at a temperature of between 0 ° C. and 100 ° C., preferably between 10 ° C. and 80 ° C., and preferably between 15 ° C. and 60 ° C.
- the compositions C1 and C2 are not miscible with each other, which means that the amount (by weight) of the composition C1 capable of being solubilized in the composition C2 is less than or equal to 5%, preferably less than 1%, and preferably less than 0.5%, relative to the total weight of composition C2, and that the amount (by weight) of the composition C2 capable of to be solubilized in composition C1 is less than or equal to 5%, preferably less than 1%, and preferably less than 0.5%, relative to the total weight of composition C1.
- the composition C1 comes into contact with the composition C2 with stirring, the latter is dispersed in the form of drops, called simple drops.
- composition C2 is stirred to form an emulsion comprising drops of composition C1 dispersed in composition C2.
- This emulsion is also called “simple emulsion” or emulsion C1-in-C2.
- step b it is possible to use any type of stirrer usually used to form emulsions, such as, for example, a mechanical stirrer, a static emulsifier, an ultrasonic homogenizer, a membrane homogenizer, a homogenizer at high pressure, a colloid mill, a high shear disperser or a high speed homogenizer.
- a mechanical stirrer such as, for example, a mechanical stirrer, a static emulsifier, an ultrasonic homogenizer, a membrane homogenizer, a homogenizer at high pressure, a colloid mill, a high shear disperser or a high speed homogenizer.
- a mechanical stirrer such as, for example, a mechanical stirrer, a static emulsifier, an ultrasonic homogenizer, a membrane homogenizer, a homogenizer at high pressure, a colloid mill, a high shear disperser or a high speed homogenizer.
- composition C1 is as defined above.
- the heart of the drops of the first emulsion is entirely formed of C1 a or a single hydrophobic solid particle.
- composition C2 is intended to form the future solid envelope of the microcapsules.
- the volume fraction of C1 in C2 can vary from 0.1 to 0.7 in order to control the thickness of the envelope of the capsules obtained at the end of the process.
- the ratio between the volume of composition C1 and the volume of composition C2 varies between 1: 10 and 10: 1.
- this ratio is between 1: 3 and 5: 1, preferably between 1: 3 and 3: 1.
- the destabilization kinetics of the drops of the emulsion (E1) is significantly slow, which allows the envelope of the microcapsules to be polymerized during step e) before the emulsion is destabilized. .
- the polymerization once completed, then provides a thermodynamic stabilization.
- the relatively high viscosity of the composition C2 ensures the stability of the emulsion (E1) obtained at the end of step b).
- the viscosity of the composition C2 at 25 ° C is between 1000 mPa.s and 50,000 mPa.s, preferably between 2000 mPa.s and 25,000 mPa.s, and for example between 3000 mPa. s and 15,000 mPa.s.
- the viscosity of the composition C2 is greater than the viscosity of the composition C1.
- the viscosity is measured using a Haake Rheostress TM 600 rheometer equipped with a cone of 60 mm diameter and 2 degrees angle, and a temperature control cell set at 25 ° C. The value of the viscosity is read for a shear rate of 10 s -1 .
- the interfacial tension between compositions C1 and C2 is low.
- these interfacial tensions vary between 0 mN / m and 50 mN / m, preferably between 0 mN / m and 20 mN / m.
- the low interfacial tension between the compositions C1 and C2 also advantageously makes it possible to ensure the stability of the emulsion (E1) obtained at the end of step b).
- composition C2 contains at least one monomer or polymer, at least one crosslinking agent, and optionally at least one (photo) initiator or crosslinking catalyst, thus making it crosslinkable.
- the composition C2 comprises from 50% to 99% by weight of monomer or polymer, or a mixture of monomers or polymers, relative to the total weight of the composition C2.
- the composition C2 comprises from 1% to 20% by weight of crosslinking agent or of a mixture of crosslinking agents, relative to the total weight of the composition C2.
- the composition C2 comprises from 0.1% to 5% by weight of photoinitiator or a mixture of photoinitiators, relative to the total weight of the composition C2.
- the composition C2 comprises from 0.001% to 70% by weight of crosslinking agent with respect to the weight of said composition C2.
- the term “monomer” or “polymer” denotes any base unit suitable for the formation of a solid material by polymerization, either alone or in combination with other monomers or polymers.
- These monomers may be chosen from monomers comprising at least one reactive functional group chosen from the group consisting of acrylate, methacrylate, vinyl ether, N-vinyl ether, mercaptoester, thiolene, siloxane, epoxy, oxetane, urethane, isocyanate and peroxide functions.
- the monomers may be chosen from monomers carrying at least one of the above-mentioned reactive functional groups and additionally bearing at least one functional group selected from the group consisting of primary, secondary and tertiary alkylamine functions, quaternary amino functions, sulfate functions, sulfonate, phoshate, phosphonate, carboxylate, hydroxyl, halogen, and mixtures thereof.
- the polymers used in the composition C2 can be chosen from polyethers, polyesters, polyurethanes, polyureas, polyethylene glycols, polypropylene glycols, polyamides, polyacetals, polyimides, polyolefins, polysulphides and polydimethylsiloxanes, said polymers additionally bearing at least one reactive function chosen. in the group consisting of acrylate, methacrylate, vinyl ether, N-vinyl ether, mercaptoester, thiolene, siloxane, epoxy, oxetane, urethane, isocyanate and peroxide functions.
- polymers examples include, but are not limited to, the following polymers: poly (2- (1-naphthyloxy) ethyl acrylate), poly (2- (2-naphthyloxy) ethyl acrylate), poly (2- (2-naphthyloxy) ethyl methacrylate), polysorbitol dimethacrylate, polyacrylamide, poly ((2- (1-naphthyloxy) ethanol), poly (2- (2-naphthyloxy) ethanol), poly (1-chloro-2) , 3-epoxypropane), poly (n-butyl isocyanate), poly (N-vinyl carbazole), poly (N-vinyl pyrrolidone), poly (p-benzamide), poly (p-chlorostyrene), poly (p-methyl styrene) poly (p-phenylene oxide), poly (p-phenylene sulfide), poly (N- (methacryloxye
- crosslinking agent is meant a compound carrying at least two reactive functional groups capable of crosslinking a monomer or a polymer, or a mixture of monomers or polymers, during its polymerization.
- the crosslinking agent may be chosen from molecules bearing at least two functional groups chosen from the group consisting of acrylate, methacrylate, vinyl ether, N-vinyl ether, mercaptoester, thiolene, siloxane, epoxy, oxetane, urethane, isocyanate and peroxide functions.
- crosslinking agent there may be mentioned in particular:
- diacrylates such as 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, polyethylene glycol dimethacrylate, 1, 9-nonanediol dimethacrylate, 1,4-butanediol dimethacrylate, 2,2-bis (4) methacryloxyphenyl) propane, 1,3-butanediol dimethacrylate, 1,10-decanediol dimethacrylate, bis (2-methacryloxyethyl) N, N'-1,9-nonylene biscarbamate, 1,4-butanediol diacrylate, ethylene glycol diacrylate, 1,5-pentanediol dimethacrylate, 1,4-phenylene diacrylate, allyl methacrylate, ⁇ , ⁇ '-methylenebisacrylamide, 2,2-bis [4- (2-hydroxy-3-methacryloxypropoxy) ) phenyl] propane, t
- multifunctional acrylates such as dipentaerythritol pentaacrylate, 1,1,1-trimethylolpropane triacrylate, 1,1,1-trimethylolpropane trimethacrylate, ethylenediamine tetramethacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate;
- acrylates which also have other reactive functional groups, such as propargyl methacrylate, 2-cyanoethyl acrylate, tricyclodecane dimethanol diacrylate, hydroxypropyl methacrylate, N-acryloxysuccinimide, N- (2-hydroxypropyl) methacrylamide, N- ( 3-aminopropyl) methacrylamide hydrochloride, N- (t-BOC-aminopropyl) methacrylamide, 2-aminoethyl methacrylate hydrochloride, monoacryloxyethyl phosphate, o-nitrobenzyl methacrylate, acrylic anhydride, 2- (tert-butylamino) ethyl methacrylate, N, N-diallylacrylamide, glycidyl methacrylate, 2-hydroxyethyl acrylate, 4- (2-acryloxyaheoxy) -2-hydroxybenzophenone, N- (Phthalimidomethyl) acrylamide, cinnamy
- photoinitiator is meant a compound capable of fragmenting under the effect of light radiation.
- photoinitiators which can be used according to the present invention are known in the art and are described, for example in "Photoinitiators in crosslinking”. Coatings ", G. Li Bassi, Double Bond - Chemistry of Paints, No. 361, November 1985, p.34-41” Industrial Applications of Photoinduced Polymerization “, Henri Strub, L'ActualInstitut Chimique, February 2000, p. .5-13 and "Photopolymers: theoretical considerations and reaction of taking", Marc, JM Abadie, Double Liaison - Chemistry of the Paintings, n ° 435-436, 1992, p.28-34.
- photoinitiators include:
- ⁇ -hydroxyketones such as 2-hydroxy-2-methyl-1-phenyl-1-propanone, sold for example under the names DAROCUR® 1 173 and 4265, IRGACURE® 184, 2959, and 500 by the company BASF, and ADDITOL® CPK by CYTEC;
- ⁇ -aminoketones in particular 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, sold, for example, under the names Irgacure® 907 and 369 by the company BASF;
- acylphosphine oxides such as, for example, bis-acylphosphine oxides (BAPO) sold for example under the names IRGACURE® 819, 1700, and 1800, DAROCUR® 4265, LUCIRIN® TPO, and LUCIRIN® TPO-L by the company BASF.
- BAPO bis-acylphosphine oxides
- aromatic ketones such as benzophenone, phenylglyoxylates, such as the methyl ester of phenylglyoxylic acid, oxime esters, such as [1- (4-phenylsulfanylbenzoyl) heptylideneamino] benzoate, sulphonium salts, iodonium salts and oxime sulphonates.
- composition C2 may further comprise an additional monomer or polymer capable of improving the properties of the envelope of the microcapsules and / or to give new properties to the envelope of the microcapsules.
- monomers or polymers bearing a group sensitive to pH, temperature, UV or IR there may be mentioned monomers or polymers bearing a group sensitive to pH, temperature, UV or IR.
- Additional monomers or polymers may be chosen from monomers or polymers bearing at least one reactive functional group chosen from the group consisting of acrylate, methacrylate, vinyl ether, N-vinyl ether, mercaptoester, thiolene, siloxane, epoxy, oxetane and urethane functions. isocyanate and peroxide, and also bearing one of the following groups:
- a hydrophobic group such as a fluorinated group, for example trifluoroethyl methacrylate, trifluoroethyl acrylate, tetrafluoropropyl methacrylate, pentafluoropropyl acrylate, hexafluorobutyl acrylate, or fluorophenyl isocyanate;
- a group that is sensitive to pH such as primary, secondary or tertiary amines, carboxylic acids, phosphate, sulphate, nitrate or carbonate groups;
- UV-sensitive or UV-cleavable group such as azobenzene, spiropyran, 2-diazo-1, 2-naphthoquinone, o-nitrobenzyl, thiol, or 6-nitro-veratroyloxycarbonyl, for example poly (ethylene) oxide) -block-poly (2-nitrobenzylmethacrylate), and other block copolymers, as described in particular in Liu et al., Polymer Chemistry 2013, 4, 3431-3443;
- an IR-sensitive or IR-cleavable group such as o-nitrobenzyl or 2-diazo-1,2-naphthoquinone, for example the polymers described in Liu et al., Polymer Chemistry 2013, 4, 3431-3443; and
- a temperature-sensitive group such as poly (N-isopropylacrylamide).
- Step c) of the process according to the invention consists in preparing a second emulsion (E2).
- the second emulsion consists of a dispersion of droplets of the first emulsion in a composition C3 immiscible with C2, created by dropwise addition of the first emulsion in C3 with stirring.
- a composition C1 a the preparation of the second emulsion is carried out at a temperature above T m .
- the preparation of the second emulsion is carried out at a temperature below T m .
- the compositions C2 and C3 are not miscible with each other, which means that the amount (by weight) of the composition C2 capable of being solubilized in the composition C3 is less than or equal to 5%, preferably less than 1%, and preferably less than 0.5%, relative to the total weight of composition C3, and that the amount (by weight) of the composition C3 capable of to be solubilized in composition C2 is less than or equal to 5%, preferably less than 1%, and preferably less than 0.5%, relative to the total weight of composition C2.
- a double drop formed during step c) corresponds to a single drop of composition C1 as described above, surrounded by a composition envelope C2 which completely encapsulates said single drop.
- the double drop formed during step c) may also comprise at least two single drops of composition C1, said single drops being surrounded by a composition envelope C2 which completely encapsulates said single drops.
- said double drops comprise a heart consisting of one or more single drops of composition C1, and a layer of composition C2 surrounding said heart.
- the resulting emulsion (E2) is generally a double polydisperse emulsion (C1-in-C2-in-C3 emulsion or C1 / C2 / C3 emulsion), which means that the double drops do not have a distinct size distribution in the emulsion (E2).
- the immiscibility between the compositions C2 and C3 makes it possible to avoid mixing between the layer of composition C2 and the composition C3 and thus ensures the stability of the emulsion (E2).
- compositions C2 and C3 also makes it possible to prevent the volatile compound of the composition C1 from migrating from the heart of the drops to the composition C3.
- step c it is possible to use any type of stirrer usually used to form emulsions, such as, for example, a mechanical stirrer, a static emulsifier, an ultrasonic homogenizer, a membrane homogenizer, a homogenizer at high pressure, a colloid mill, a high shear disperser or a high speed homogenizer.
- a mechanical stirrer such as, for example, a mechanical stirrer, a static emulsifier, an ultrasonic homogenizer, a membrane homogenizer, a homogenizer at high pressure, a colloid mill, a high shear disperser or a high speed homogenizer.
- a mechanical stirrer such as, for example, a mechanical stirrer, a static emulsifier, an ultrasonic homogenizer, a membrane homogenizer, a homogenizer at high pressure, a colloid mill, a high shear disperser or a high speed homogenizer.
- the viscosity of the composition C3 at 25 ° C is higher than the viscosity of the emulsion (E1) at 25 ° C.
- the viscosity of the composition C3 at 25 ° C is between 500 mPa.s and 100,000 mPa.s.
- the viscosity of the composition C3 at 25 ° C. is between 3,000 mPa.s and 100,000 mPa.s, preferably between 5,000 mPa.s and 80,000 mPa.s, for example between 7,000 mPa.s. and 70,000 mPa.s.
- the destabilization rate of the double drops of the emulsion (E2) is significantly slow compared to the duration of the process of the invention. , which then provides a kinetic stabilization of the emulsions (E2) and then (E3) until the polymerization of the capsule shell is completed.
- the capsules once polymerized are thermodynamically stable.
- the very high viscosity of the composition C3 ensures the stability of the emulsion (E2) obtained at the end of step b).
- a high viscosity of the system advantageously ensures the kinetic stability of the double emulsion (E2), preventing it from being out of phase for the duration of the manufacturing process.
- the interfacial tension between compositions C2 and C3 is low.
- the low interfacial tension between the compositions C2 and C3 also advantageously makes it possible to ensure the stability of the emulsion (E2) obtained at the end of step c).
- the volume fraction of the first emulsion (E1) in C3 can be varied from 0.05 to 0.5 in order, on the one hand, to improve the production yield and, on the other hand, to vary the mean diameter of the capsules. At the end of this step, the size distribution of the second emulsion is relatively wide.
- the ratio between the emulsion volume (E1) and the composition volume C3 varies between 1: 10 and 10: 1.
- this ratio is between 1: 9 and 3: 1, preferably between 1: 9 and 1: 1.
- composition C3 may further comprise at least one gelling agent as described above.
- the composition C3 further comprises at least one connected polymer, preferably with a molecular weight greater than 5000 g. mol "1 , and / or at least one polymer of molecular weight greater than 5,000 g. mol " 1 , and / or solid particles such as silicates.
- the composition C3 comprises at least one plugged polymer that can be used as a gelling agent, preferably with a molecular weight greater than 5,000 g. mol "1, preferably between 10 000 g. mol” 1 and 500 000 g. mol "1 , for example between 50,000 g mol -1 and 300,000 g. mol "1 .
- branched polymer (or branched polymer) is meant a polymer having at least one branch point between its two end groups, a branch point (also called branch point) being a point of a chain on which is fixed a side chain also called branch or hanging chain.
- branched polymers there may be mentioned for example graft polymers, comb, or star polymers or dendrimers.
- the composition C3 comprises at least one polymer with a molecular weight greater than 5,000 g. mol "1 , preferably between 10,000 g. mol "1 and 500,000 g mol -1 , for example between 50,000 g. mol "1 and 300 000 g mol -1 can be used as a gelling agent.
- polymer that can be used as a gelling agent mention may be made of the following compounds, used alone or mixed together:
- cellulose derivatives such as cellulose ethers: methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, methylhydroxyethyl cellulose, ethylhydroxyethyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose or methylhydroxypropyl cellulose;
- polyacrylates also called carbomers
- PAA polyacrylic acid
- PMAA polymethacrylic acid
- HPEMA poly (hydroxyethyl methacrylate)
- HPMA poly (N-2-hydroxypropyl methacrylate)
- polyacrylamides such as poly (N-isopropylacrylamide) (PNIPAM);
- PVP polyvinylpyrrolidone
- PVA polyvinyl alcohol
- poly (ethylene glycol), poly (propylene glycol) and their derivatives such as poly (ethylene glycol) acrylate / methacrylate, poly (ethylene glycol) diacrylate / dimethacrylate, polypropylene carbonate;
- polysaccharides such as carrageenans, carob gum or tara gums, dextran, xanthan gums, chitosan, agarose, hyaluronic acids, gellan gum, guar gum, gum arabic, gum tragacanth , gum diutane, oat gum, karaya gum, ghatti gum, curdian gum, pectin, konjac gum, starch;
- protein derivatives such as gelatin, collagen, fibrin, polylysine, albumin, casein;
- silicone derivatives such as polydimethylsiloxane (also called dimethicone), alkyl silicones, aryl silicones, alkyl aryl silicones, polyethylene glycol dimethicones, polypropylene glycol dimethicone;
- waxes such as diester waxes (alkanediol diesters, hydroxyl acid diesters), triester waxes (triacylglycerols, triesters of alkane-1, 2-diol, ⁇ -hydroxy acid and fatty acid, esters of hydroxymalonic acid, fatty acid and alcohol, triesters of hydroxyl acids, fatty acid and fatty alcohol, triesters of fatty acid, hydroxyl acid and diol) and polyester waxes (polyesters of Fatty acids).
- the fatty acid esters which can be used as waxes in the context of the invention are, for example, cetyl palmitate or octanoate.
- fatty acids that can be used as waxes such as cerotic acid, palmitic acid, stearic acid, dihydroxystearic acid, behenic acid, lignoceric acid, arachidic acid, myristic acid, lauric acid, tridecyclic acid, pentadecyclic acid, margaric acid, nonadecyclic acid, henicosylic acid, tricosylic acid, pentacosylic acid, heptacosylic acid, montanic acid or nonacosylic acid;
- fatty acid salts in particular fatty acid aluminum salts, such as aluminum stearate, hydroxyl aluminum bis (2-ethylhexanoate);
- castor oil and its derivatives especially modified hydrogenated castor oil or compounds obtained by esterification of castor oil with fatty alcohols;
- styrenic polymers such as styrene butadiene
- polyolefins such as polyisobutene.
- the composition C3 comprises solid particles such as clays, silicas and silicates that can be used as gelling agents.
- clays and silicates belonging in particular to the category of phyllosilicates also known as layered silicas.
- silicates also known as layered silicas.
- the fumed synthetic silicas can also be used.
- the clays, silicates and silicas mentioned above can advantageously be modified by organic molecules such as polyethers, ethoxylated amides, quaternary ammonium salts, long chain diamines, long chain esters, polyethylene glycols, polypropylene glycols.
- These particles can be used alone or mixed together.
- the composition C3 comprises at least one polymer with a molecular weight greater than 5,000 g. mol- 1 and solid particles Any mixture of the compounds mentioned above may be used.
- Step d) of the process according to the invention consists in refining the size of the drops of the second emulsion (E2).
- the refining in size is carried out at a temperature greater than T m .
- the second monodisperse emulsion is then allowed to cool below to a temperature below T m .
- the refining in size is carried out at a temperature below T m .
- Step d) may consist in applying a homogeneous controlled shear to the emulsion (E2), said shear rate applied being between 10 s -1 and 100,000 s -1 .
- the double polydisperse drops obtained in step c) are subjected to a size refinement consisting of shearing them capable of breaking them into new double drops of homogeneous and controlled diameters.
- this fragmentation step is carried out using a Couette type high-shear cell according to a process described in patent application EP 15 306 428.2.
- step d) the second emulsion (E2), obtained at the end of step c), consisting of polydisperse double droplets dispersed in a continuous phase, is subjected to shear in a mixer, which applies a homogeneous controlled shear.
- step d) consists in applying a homogeneous controlled shear to the emulsion (E2), said applied shearing speed being between 1000 s -1 and 100,000 s -1 .
- the shear rate is said to be controlled and homogeneous, regardless of the duration, when it passes to an identical maximum value for all parts of the emulsion, at a given instant that may vary. from one point of the emulsion to another.
- the exact configuration of the mixer is not essential according to the invention, as long as the entire emulsion has been subjected to the same maximum shear out of this device.
- Mixers adapted to perform step d) are described in particular in US 5,938,581.
- the second emulsion can undergo homogeneous controlled shear as it flows through a cell formed by:
- the shear rate applied to the second emulsion is between 1,000 s -1 and 100,000 s -1 , preferably between 1,000 s -1 and 50,000 s -1 , and preferably between 2,000 s "1 and 20,000 s " 1 .
- the second emulsion is introduced into the mixer and is then subjected to shear resulting in the formation of the third emulsion.
- the third emulsion (E3) is chemically identical to the second emulsion (E2) but consists of monodisperse double drops while the emulsion (E2) consists of double polydisperse drops.
- the third emulsion (E3) typically consists of a dispersion of double drops comprising a core consisting of one or more drops of composition C1 and a layer of composition C2 encapsulating said core, said double drops being dispersed in composition C3.
- the difference between the second emulsion and the third emulsion is the size variance of the double drops: the drops of the second emulsion are polydisperse in size while the drops of the third emulsion are monodisperse, thanks to the fragmentation mechanism described above.
- the second emulsion is introduced continuously into the mixer, which means that the quantity of double emulsion (E2) introduced at the mixer inlet is the same as the quantity of third emulsion ( E3) at the mixer outlet.
- the size of the drops of the emulsion (E3) corresponds essentially to the size of the drops of the solid microcapsules after polymerization, it is possible to adjust the size of the microcapsules and the thickness of the envelope by adjusting the speed of the shearing during step d), with a strong correlation between decrease in drop size and increase in shear rate. This makes it possible to adjust the resulting dimensions of the microcapsules by varying the shear rate applied during step d).
- the mixer implemented during step d) is a Couette type mixer, comprising two concentric cylinders, an outer cylinder of inner radius R 0 and an inner cylinder of outer radius R , the cylinder external being fixed and the inner cylinder being rotated with an angular velocity ⁇ .
- a Couette type mixer adapted for the process of the invention may be provided by T.S.R. France.
- the angular velocity ⁇ of the internal rotating cylinder of the Couette type mixer is greater than or equal to 30 rad.s 1 .
- the angular velocity ⁇ of the inner rotating cylinder of the Couette type mixer is about 70 rad.s -1 .
- the distance d between the two concentric cylinders is equal to 100 ⁇ .
- the second emulsion is introduced at the inlet of the mixer, typically via a pump, and is directed towards the space between the two concentric cylinders, the outer cylinder being fixed and the inner cylinder being rotated at an angular velocity ⁇ .
- the shear rate applied to said emulsion is given by the following equation:
- R 0 is the internal radius of the fixed outer cylinder
- - R is the outer radius of the inner cylinder in rotation.
- the step d) consists in applying to the emulsion (E2) a shear rate of less than 1000 s "1 .
- the fragmentation step d) can be carried out using any type of mixer usually used to form emulsions with a shear rate of less than 1000 s -1 , in which case the viscosity of the composition C3 is greater than 2,000 mPa.s, namely under conditions such as those described in the patent application FR 16 61787.
- step d) the emulsion (E2), consisting of polydisperse drops dispersed in a continuous phase, is subjected to shearing, for example in a mixer, at a low shear rate, to be less than 1,000 s "1 .
- the shear rate applied in step d) is, for example, between 10 s -1 and 1000 s -1 .
- the shear rate applied in step d) is strictly less than 1000 s -1 .
- the emulsion drops (E2) can be efficiently fragmented into fine and monodisperse emulsion drops (E3) only if a high shear stress is applied thereto.
- the shear stress ⁇ applied to a drop of emulsion (E2) is defined as the tangential force per unit area of drop resulting from the macroscopic shear applied to the emulsion during its stirring during step d).
- the high viscosity of the composition C3 makes it possible to apply a very high shear stress to the emulsion drops (E2) in the mixer, even if the shear rate is low and the shear inhomogeneous.
- step d) it is possible to use any type of stirrer usually used to form emulsions, such as, for example, a mechanical stirrer, a static emulsifier, an ultrasonic homogenizer, a homogenizer membrane, a high pressure homogenizer, a colloid mill, a high shear disperser or a high speed homogenizer.
- a mechanical stirrer such as, for example, a mechanical stirrer, a static emulsifier, an ultrasonic homogenizer, a homogenizer membrane, a high pressure homogenizer, a colloid mill, a high shear disperser or a high speed homogenizer.
- a mechanical stirrer such as, for example, a mechanical stirrer, a static emulsifier, an ultrasonic homogenizer, a homogenizer membrane, a high pressure homogenizer, a colloid mill, a high shear disperser or a high speed homogenizer.
- a simple emulsifier such as a mechanical stirrer with pale or a static emulsifier is used to implement step d). Indeed, this is possible because this embodiment requires neither controlled shear nor shear greater than 1,000 s -1 .
- Step e) of the process of the invention consists of the crosslinking and therefore the formation of the shell of the solid microcapsules according to the invention.
- This step makes it possible both to achieve the expected performance of protection and retention of the capsules and to ensure their thermodynamic stability, permanently preventing any destabilizing mechanism such as coalescence or ripening.
- step e) is a photopolymerization step of exposing the emulsion (E3) to a light source capable of initiating the photopolymerization of the composition C2, in particular to a UV light source emitting preferably in the wavelength range of between 100 nm and 400 nm, and in particular for a duration of less than 15 minutes.
- step e) consists of subjecting the emulsion (E3) to photopolymerization, which will allow the photopolymerization of the composition C2. This step will make it possible to obtain microcapsules encapsulating the volatile compound as defined above.
- step e) consists in exposing the emulsion (E3) to a light source capable of initiating the photopolymerization of the composition C2.
- the light source is a source of UV light.
- the UV light source emits in the wavelength range of between 100 nm and 400 nm.
- the emulsion (E3) is exposed to a light source for less than 15 minutes, and preferably for 5 to 10 minutes.
- the envelope of the aforementioned double drops consisting of photocurable composition C2
- the envelope of the aforementioned double drops is crosslinked and thus converted into a viscoelastic polymeric envelope, encapsulating and protecting the volatile compound (s) from their) release in the absence of a mechanical trigger.
- step e) is a polymerization step, without exposure to a light source, the duration of this polymerization step e) being preferably between 8 hours and 100 hours and / or this step e) being carried out at a temperature between 20 ° C and 80 ° C.
- the polymerization is initiated for example by exposure to heat (thermal initiation), or simply by contacting the monomers, polymers and crosslinking agents with each other, or with a catalyst.
- the polymerization time is then generally greater than several hours.
- the polymerization step e) of the composition C2 is carried out for a period of between 8 hours and 100 hours at a temperature of between 20 ° C. and 80 ° C.
- composition obtained at the end of stage e comprising solid microcapsules dispersed in composition C3, is ready for use and can be used without any additional step of post-treatment of the capsules is required.
- the thickness of the envelope of the microcapsules thus obtained is typically between 0.1 ⁇ m and 20 ⁇ m, preferably between 0.2 ⁇ m and 10 ⁇ m, preferably between 0.2 ⁇ m and 8 ⁇ m.
- the solid microcapsules obtained at the end of step e) are devoid of surfactant at the interface between the solid shell and the external medium (or continuous phase), in particular represented by the composition C3. .
- the method of the invention has the advantage of not requiring a surfactant, in any of steps b) to e) of formation of the envelope of the solid microcapsules.
- the method of the invention thus makes it possible to reduce the presence of additives which could modify the properties of the final product obtained after the release of the volatile compound.
- the present invention also relates to a series (or set) of solid microcapsules, obtainable by the method as defined above, in which each microcapsule comprises:
- a core comprising a composition C1 as defined above, and
- a solid envelope completely encapsulating at its periphery the core, in which the mean diameter of said microcapsules is between 1 ⁇ and 30 ⁇ , the thickness of the rigid envelope is between 0.1 ⁇ and 20 ⁇ and the difference type of the diameter distribution of the microcapsules is less than 50%, in particular less than 25%, or less than 1 ⁇ .
- the process of the invention makes it possible to obtain monodisperse particles.
- the series of solid microcapsules mentioned above is formed of a population of monodisperse particles in size.
- the standard deviation of the diameter distribution of the microcapsules is less than 50%, in particular less than 25%, or less than 1 ⁇ m.
- the size distribution of the solid microcapsules can be measured by light scattering technique using a Mastersizer 3000 (Malvern Instruments) equipped with a Hydro SV cell.
- the aforementioned solid microcapsules comprise a solid shell entirely composed of crosslinked polymer (obtained from composition C2).
- the present invention therefore also relates to solid microcapsules comprising a core and a rigid envelope completely encapsulating at its periphery the core, the core being a composition C1 and said rigid envelope being made of crosslinked polymer,
- the diameter of said capsule being between 1 ⁇ and 30 ⁇ and the thickness of the rigid envelope being between 0.1 ⁇ and 20 ⁇ ,
- composition C1 is:
- composition C1a comprising a single hydrophobic solid particle
- composition C1b comprising a plurality of hydrophobic solid particles dispersed in a hydrophilic phase
- hydrophobic solid particles containing one or more lipophilic volatile compounds and one or more hydrophobic materials, solid at room temperature and liquid at a temperature above T m , T m being between 30 ° C and 80 ° C.
- the present invention also relates to a composition comprising a series of solid microcapsules as defined above.
- the composition comprises at least one double population of solid microcapsules according to the invention which differ from each other at least in the composition C1, in particular at the level of the perfuming agent.
- This embodiment is advantageous in that it notably makes it possible to stably and efficiently encapsulate incompatible volatile compounds when present within the same solution.
- the capsules of the invention may advantageously be used to protect the active ingredients used in the polymer, elastomer, rubber, paint, adhesive, seal, mortar, paper, varnish or coating; in synthetic chemistry products; laundry, detergent, laundry and home care products; in agrochemicals such as fertilizers, herbicides, insecticides, fungicides or pesticides; textiles; petrochemicals such as lubricants, fuels, bitumens, drilling fluids and well stimulation.
- the present invention also relates to a method for releasing a volatile compound, comprising a step of applying a mechanical shear stress to a composition comprising a series of solid microcapsules as defined above.
- a mechanical stirrer (Ika Eurostar 20) equipped with a deflocculating stirring propeller is used to carry out all the stirring steps.
- composition C1a is placed in a bath thermostated at 35 ° C and stirred at 500 rpm until complete dissolution of the wax.
- Composition B is placed in a bath thermostated at 35 ° C and stirred at 200 rpm until complete homogenization.
- the composition C1 a is then added to the composition B dropwise with stirring at 2000 rpm, still at 35 ° C.
- the mixture is stirred at 2000 rpm for 5 minutes and then sonicated (Vibra-cell 75042, Sonics) for 20 minutes (draws 5s / 2s) at 30% amplitude. If the temperature exceeds 35 ° C during sonication, the mixture is cooled by ice.
- the first emulsion (E1) is thus obtained.
- composition C3 is stirred at 1000 rpm until complete homogenization.
- the second monodisperse emulsion (E3) obtained in the previous step is irradiated for 15 minutes with the aid of a UV light source (Dymax LightBox ECE 2000) having a maximum light intensity of 0.1 W / cm 2 at a wavelength of 365 nm.
- a UV light source Dymax LightBox ECE 2000
- the solid microcapsules according to Example 1 have a good size distribution, namely an average size of 2.4 ⁇ and a standard deviation of 1.1 ⁇ , ie 46%. Moreover, the quality of encapsulation of the volatile lipophilic compound, namely the organic solvent, with the microcapsules according to Example 1 was followed for 30 days at room temperature.
- the solid microcapsules according to Example 1 thus prove to be particularly suitable for effectively encapsulating a volatile lipophilic compound, in particular an organic solvent.
- Example 2 Manufacture of solid capsules according to the invention
- a mechanical stirrer (Ika Eurostar 20) equipped with a deflocculating stirring propeller is used to carry out all the stirring steps.
- Beta-ionone (4- (2,6,6-Trimethyl-1-cyclohexenyl) -3-buten-2-one, Sigma 2
- composition C1a is placed in a bath thermostated at 35 ° C and stirred at 500 rpm until complete dissolution of the wax.
- Composition B is placed in a bath thermostated at 35 ° C and stirred at 200 rpm until complete homogenization.
- the composition C1 a is then added to the composition B dropwise with stirring at 2000 rpm still at 35 ° C. It is then subjected to high agitation using an emulsification rod for 5 min (19G, Ultra-Turrax®, IKA) and sonication for 3 minutes (Vibra-cell 75042, Sonics, 5s / 2s) at 30% amplitude. If the temperature exceeds 35 ° C during sonication, the mixture is cooled by ice.
- the first emulsion (E1) is thus obtained.
- composition C3 is stirred at 2000 rpm until complete homogenization.
- a monodisperse emulsion (E3) is thus obtained.
- the second monodisperse emulsion (E3) obtained in the previous step is irradiated for 15 minutes with the aid of a UV light source (Dymax LightBox ECE 2000) having a maximum light intensity of 0.1 W / cm 2 at a wavelength of 365 nm.
- a UV light source Dymax LightBox ECE 2000
- the solid microcapsules according to Example 2 have a good size distribution, namely an average size of 10 ⁇ and a standard deviation of 3.7 ⁇ is 37%.
- the capsules according to the invention are capable of efficiently retaining 99.5% +/- 0.2% of the initially encapsulated beta-ionone.
- the solid microcapsules according to Example 2 thus prove to be particularly suitable for effectively encapsulating a volatile lipophilic compound, in particular an odoriferous molecule such as beta-ionone.
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- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing Of Micro-Capsules (AREA)
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Abstract
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1752332A FR3064192B1 (fr) | 2017-03-21 | 2017-03-21 | Procede de preparation de capsules comprenant au moins un compose volatile et capsules obtenues |
PCT/EP2018/057216 WO2018172433A1 (fr) | 2017-03-21 | 2018-03-21 | Procédé de préparation de capsules comprenant au moins un composé volatile et capsules obtenues |
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EP3600643A1 true EP3600643A1 (fr) | 2020-02-05 |
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EP18711369.1A Pending EP3600643A1 (fr) | 2017-03-21 | 2018-03-21 | Procédé de préparation de capsules comprenant au moins un composé volatile et capsules obtenues |
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US (1) | US20210113984A1 (fr) |
EP (1) | EP3600643A1 (fr) |
JP (1) | JP7258770B2 (fr) |
KR (1) | KR102528482B1 (fr) |
CN (1) | CN110831693A (fr) |
FR (1) | FR3064192B1 (fr) |
WO (1) | WO2018172433A1 (fr) |
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FR3091877B1 (fr) * | 2019-01-22 | 2023-06-16 | Calyxia | Compositions de detergence avec des propriétés olfactives améliorées |
FR3091878B1 (fr) * | 2019-01-22 | 2023-06-16 | Calyxia | Compositions de produits d’entretien avec des propriétés olfactives améliorées |
WO2024089135A1 (fr) | 2022-10-27 | 2024-05-02 | Calyxia Sas | Procédé de fabrication de microcapsules et microcapsules |
WO2024133458A1 (fr) | 2022-12-20 | 2024-06-27 | Calyxia Sas | Pluralité de microcapsules et leur utilisation dans des polymères |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2747321B1 (fr) | 1996-04-16 | 1998-07-10 | Centre Nat Rech Scient | Procede de preparation d'une emulsion |
FR2792190B1 (fr) | 1999-04-16 | 2001-09-28 | Sophim | Procede de fabrication d'un emollient non gras a base de cires-esters |
DE10139171A1 (de) | 2001-08-16 | 2003-02-27 | Basf Ag | Verwendung von Mikrokapseln in Gipskartonplatten |
FR2867075B1 (fr) * | 2004-03-03 | 2006-07-14 | Ethypharm Sa | Procede de preparation de microspheres biodegradables calibrees |
WO2006013413A1 (fr) | 2004-07-28 | 2006-02-09 | L'oreal | Composition cosmétique comportant un trisiloxane alkyle linéaire volatile |
FR2890858B1 (fr) | 2005-09-20 | 2008-02-22 | Oreal | Composition demaquillante |
ES2761937T3 (es) * | 2005-10-24 | 2020-05-21 | Magsense Life Sciences Inc | Método para preparar micropartículas recubiertas con polímero |
GB0526416D0 (en) * | 2005-12-23 | 2006-02-08 | Syngenta Ltd | Formulation |
EP1844653B1 (fr) | 2006-03-30 | 2017-07-26 | GAT Microencapsulation GmbH | Nouvelles formulations agrochimiques contenant des microcapsules |
DK1840145T3 (en) * | 2006-03-30 | 2018-02-12 | Fmc Corp | Microcapsules of acetylenecarbamide derivatives-polyurea polymers and controlled release formulations |
US8163207B2 (en) * | 2006-10-17 | 2012-04-24 | Basf Aktiengesellschaft | Microcapsules |
CA2711200A1 (fr) * | 2008-01-15 | 2009-07-23 | Basf Se | Microcapsules contenant un parfum et a comportement de liberation ameliore |
JP5730295B2 (ja) | 2009-06-15 | 2015-06-10 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | 架橋剤として高分岐型ポリマーを有するマイクロカプセル |
BR112015004387A2 (pt) * | 2012-08-28 | 2017-07-04 | Basf Se | microcápsula, composição para cuidado com tecido e cuidado doméstico, formulação cosmética, uso de uma microcápsula, e, processo para a fabricação de uma microcápsula |
CA2966941A1 (fr) | 2014-11-24 | 2016-06-02 | The Procter & Gamble Company | Compositions comprenant des agents actifs encapsules a l'interieur de gouttelettes et d'autres compartiments |
EP3124112A1 (fr) | 2015-07-30 | 2017-02-01 | DWI - Leibniz-Institut für Interaktive Materialien e.V. | Procédé pour l'encapsulation de substances dans des capsules à base de silice et produits ainsi obtenus |
-
2017
- 2017-03-21 FR FR1752332A patent/FR3064192B1/fr active Active
-
2018
- 2018-03-21 WO PCT/EP2018/057216 patent/WO2018172433A1/fr unknown
- 2018-03-21 CN CN201880020511.6A patent/CN110831693A/zh active Pending
- 2018-03-21 JP JP2019552456A patent/JP7258770B2/ja active Active
- 2018-03-21 EP EP18711369.1A patent/EP3600643A1/fr active Pending
- 2018-03-21 KR KR1020197030797A patent/KR102528482B1/ko active IP Right Grant
- 2018-03-21 US US16/496,057 patent/US20210113984A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
FR3064192B1 (fr) | 2019-04-26 |
US20210113984A1 (en) | 2021-04-22 |
KR102528482B1 (ko) | 2023-05-03 |
WO2018172433A1 (fr) | 2018-09-27 |
FR3064192A1 (fr) | 2018-09-28 |
JP2020514044A (ja) | 2020-05-21 |
JP7258770B2 (ja) | 2023-04-17 |
CN110831693A (zh) | 2020-02-21 |
KR20190127881A (ko) | 2019-11-13 |
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