POLYAMIDE MICROCAPSULES

Abstract

The present invention relates to polyamide microcapsules. A process for preparing polyamide microcapsules is also an object of the invention. Fragrance compositions and consumer products comprising the microcapsules, in particular fragranced consumer products in the form of household or personal care products, are also part of the invention.

Description

POLYAMIDE MICROCAPSULES Field of Invention The present invention relates to polyamide microcapsules. A process for preparing polyamide microcapsules is also an object of the invention. Fragrance compositions and consumer products comprising the microcapsules, in particular fragranced consumer products in the form of household or personal care products, are also part of the invention. Background of the Invention One of the challenges facing the perfume industry lies in the relatively rapid loss of the olfactory benefit provided by odoriferous compounds due to their volatility, particularly that of top notes. To adapt the release rates of volatiles, delivery systems such as microcapsules containing a perfume are needed to protect and then release the core payload upon activation. A key industry requirement for these systems is their ability to survive suspension in challenging bases without dissociating or physically degrading. This is known as the chemical stability of the delivery system. For example, cleaning products Ref. 336877 rncn Ln / zznz / E / YiAi Perfumed personal and household products containing high levels of aggressive surfactant detergents pose a major challenge to the stability of microcapsules. Polyurea- and polyurethane-based microcapsule suspensions are widely used, for example, in the perfume industry, as they provide a pleasant and long-lasting olfactory effect after application to various substrates. These microcapsules have been extensively described in the prior art (see, for example, WO 2007 / 004166 or EP 2300146 of the Applicant). There is still a need to provide new microcapsules without compromising the performance of the microcapsules, particularly in terms of stability in a challenging environment such as the base of a consumer product, as well as in providing good performance in terms of active ingredient delivery, for example, olfactory performance in the case of perfume ingredients. The present invention proposes a solution to the aforementioned problem by providing new polyamide microcapsules and a process for preparing the microcapsules. Summary of the Invention It has now been found that core-shell microcapsules encapsulating hydrophobic material can be obtained by reacting an acyl chloride as defined in the present invention with at least one amino compound during the preparation process. rncn Ln / zznz / E / YiAi A first object of the invention is a polyamide core-shell microcapsule comprising: - an oil-based core comprising a hydrophobic material, preferably a perfume, and - a polyamide cover comprising: • at least one acyl chloride, and • at least one amino compound, wherein the acyl chloride has the following formula wherein n is an integer ranging from 1 to 8, preferably from 1 to 6, more preferably from 1 to 4, and wherein X is a C3 to Ce (n+1)-valent alkyl group, or a C2 to C45 (n+1)-valent hydrocarbon group comprising at least one group selected from (i) to (vi), R OOO (i) (iii) (iv) (v) (vi) wherein R is a hydrogen atom or a methyl or ethyl group, preferably a hydrogen atom, provided that cyclohexane trichloride is excluded- 1,3,5-tricarbonyl and 2,2'-oxydiacetyl chloride. In a second aspect, the present invention relates to a process for preparing a suspension of polyamide core-shell microcapsules comprising the following steps: a) Dissolve at least one acyl chloride in a hydrophobic material, preferably a perfume, to form an oily phase; b) Disperse the oily phase obtained in step a) in an aqueous phase to obtain an oil-in-water emulsion; c) Perform a curing step to form polyamide microcapsules in suspension form; wherein a stabilizer is added to the oil phase and / or the aqueous phase, and wherein at least one amino compound is added to the aqueous phase before the formation of the oil-in-water emulsion and / or in the oil-in-water emulsion obtained after step b) wherein the acyl chloride has the following formula (I)0 / O \ VX“K ) d) cr \ Cl / n rncn Ln / zznz / E / YiAi where n is an integer ranging from 1 to 8, preferably from 1 to 6, more preferably from 1 to 4, and where X is a C3 to Cg (n+1)-valent alkyl group, or a C2 to C45 (n+1)-valent hydrocarbon group comprising rncn Ln / zznz / E / YiAi less a group selected from (i) to (vi). where R is a hydrogen atom or a methyl or ethyl group, preferably a hydrogen atom, with the condition that 1,3,5-tricarbonyl cyclohexane trichloride and 2,2'-oxydiacetyl chloride are excluded. A third object of the invention is a suspension of polyamide core-shell microcapsules that can be obtained by the process defined above. A fragrance composition comprising: (i) microcapsules as defined above, wherein the hydrophobic material comprises a perfume, (ii) at least one ingredient selected from the group consisting of a perfume carrier and a perfume base, (iii) optionally at least one perfume adjuvant is another object of the invention. Another object of the invention is a consumer product comprising: - an active personal care base, and microcapsules as defined above or the perfume composition as defined above, wherein the consumer product is in the form of a personal care composition. Another object of the invention is a consumer product comprising: - an active base for home care or fabric care, and microcapsules as defined above or the perfume composition as defined above, wherein the consumer product is in the form of a home care or fabric care composition. Detailed Description of the Invention Unless otherwise stated, percentages (%) are understood to designate a percentage by weight of a composition. An active ingredient is understood to be a single compound or a combination of ingredients. Perfume or flavor oil means a single perfume or flavoring compound or a mixture of several perfume or flavoring compounds. A consumer product or final product is understood to be a manufactured product ready to be distributed, sold and used by a consumer. For the purposes of clarity, the term dispersion in the present invention means a system in which the particles are dispersed in a continuous phase of different composition and specifically includes a suspension or an emulsion. By microcapsule, or similar, in the present invention means a core-shell microcapsule having a particle size distribution in the range of microns (e.g., an average diameter (d(v, 0.5)) between approximately 1 and 3000 microns) and comprising an outer solid polymer-based shell and an internal continuous oil phase enclosed by the outer shell. A microcapsule suspension refers to a microcapsule(s) dispersed in a liquid. In one formulation, the suspension is an aqueous suspension, meaning the microcapsule(s) are dispersed in an aqueous phase. An amino compound should be understood to be a compound that has at least two reactive amino groups. In the present invention, the terms acyl chloride and acid chloride are used interchangeably. In the present invention, the terms 2,2'-oxydiacetyl chloride and diglycolyl chloride are used interchangeably. Polyamide microcapsules are understood to mean that the microcapsule shell comprises a polyamide material made from a reaction product between an acyl chloride and at least one amino compound, with optionally a stabilizer. The term polyamide microcapsules may also encompass a shell made of a composite comprising a polyamide material and another material, for example, a biopolymer. Polyamide microcapsules An object of the invention is a polyamide-covered rncn Ln / zznz / E / YiAi core microcapsule comprising: - an oil-based core comprising a hydrophobic material, preferably a perfume, and - a polyamide cover comprising: • at least one acyl chloride • at least one amino compound, wherein the acyl chloride has the following formula (I) O / O \ Vx-K ) W Cl· \ Cl / Π where n is an integer ranging from 1 to 8, preferably from 1 to 6, more preferably from 1 to 4, and where X is a C3a Ce (n+1)-valent alkyl group, or a C2a C45 (n+1)-valent hydrocarbon group comprising at least one group selected from (i) to (vi), (i) (ii) (ii) (iii) (v) (v) (vi) wherein R is a hydrogen atom or a methyl or ethyl group, preferably a hydrogen atom, provided that 1,3,5-tricarbonyl cyclohexane trichloride and 2,2'-oxydiacetyl chloride are excluded. Another object of the invention is a suspension of polyamide core-shell microcapsules comprising at least one polyamide core-shell microcapsule as defined above. According to one modality, if the hydrocarbon group X comprises several groups selected from (i) to (vi), each of them is separated by at least one carbon atom from X. It is understood that by "hydrocarbon group" it means that the group is formed from hydrogen and carbon atoms and may be in the form of an aliphatic hydrocarbon, i.e., a linear or branched saturated hydrocarbon (e.g., an alkyl group), or a branched unsaturated hydrocarbon (e.g., an alkenyl or alkynyl group), a saturated cyclic hydrocarbon (e.g., a cycloalkyl group) or an unsaturated cyclic hydrocarbon (e.g., a cycloalkenyl or cycloalkynyl group), or it may be in the form of an aromatic hydrocarbon, i.e., an aryl group, or it may also be in the form of a mixture of groups, e.g., a specific group may comprise a linear alkyl, a branched alkenyl (e.g., having one or more carbon-carbon double bonds), a (poly)cycloalkyl, and an aryl moiety, unless a specific limitation is mentioned. only one type.Similarly, in all embodiments of the invention, when a group is referred to as having more than one type of topology (e.g., linear, cyclic, or branched) and / or being saturated or unsaturated (e.g., alkyl, aromatic, or alkenyl), it also means a group that may comprise residues having any of the topologies or being saturated or unsaturated, as explained above. Likewise, in all embodiments of the invention, when a group is referred to as having one type of saturation or unsaturation (e.g., alkyl), it is understood that the group may have any type of topology (e.g., linear, cyclic, or branched) or have several residues with various topologies. The term "...a hydrocarbon group, which possibly comprises..." is understood to mean that the hydrocarbon group optionally comprises heteroatoms to form ether, thioether, amine, nitrile or carboxylic acid groups and derivatives (including, for example, esters, acids, amides). These groups can either replace a hydrogen atom of the hydrocarbon group and thus bond laterally to the hydrocarbon, or replace a carbon atom (if chemically possible) of the hydrocarbon group and thus insert into the rncn Ln / zznz / E / YiAi chain or hydrocarbon ring. According to one modality, when group (vi) is present, it is only present in combination with any of groups (i) to (v). According to a particular embodiment, the acyl chloride is selected from the group consisting of 1,2,3-tricarbonyl propane trichloride, 1,2,4,5-tetracarbonyl cyclohexane tetrachloride, 2,2'-disulfanidiyldisuccinyl dichloride, 2-(2-chloro-2-oxo-ethyl)sulfanylbutanedioyl dichloride, (4-chloro-4-oxobutanoyl)-L-glutamoyl dichloride, (S)-4-((1,5-dichloro-1,5-dioxopentan-2-yl)amino)-4-oxobutanoic acid, 2,2-bis[(4-chloro-4-oxobutanoyl)oxymethyl]butyl 4-chloro-4-oxobutanoate, and 4-chloro-4-oxobutanoate of [2-[2,2bis[(4-chloro-4-oxo-butanoyl)oxymethyl]butoxymethyl]-2-[(4-chloro-4-oxo-butanoyl)oxymethyl]butyl], 2,2-bis[(2-chlorocarbonylbenzoyl)oxymethyl]butyl 2-chlorocarbonylbenzoate, [2-[2,2-bis[(2-chlorocarbonylbenzoyl)oxymethyl]butoxymethyl]-2-[(2-chlorocarbonylbenzoyl)oxymethyl]butyl 2-chlorocarbonylbenzoate, 4-(2,4,5-trichlorocarbonylbenzoyl)oxybutyl 2,4,5-trichlorocarbonylbenzoate, and mixtures thereof. A polyamide shell comprising at least one acyl chloride and at least one amino compound shall be understood to mean that the polyamide shell is derived from at least one acyl chloride and at least one amino compound. In other words, the polyamide shell rncn Ln / zznz / E / YiAi shall be understood to comprise the reaction product of at least one acyl chloride with at least one amino compound. According to one embodiment, when a stabilizer is present in the coating, the polyamide coating is understood to be derived from an acyl chloride, at least one amino compound, and a stabilizer. In other words, according to this embodiment, the polyamide coating comprises the reaction product of an acyl chloride with at least one amino compound and a stabilizer. The weight ratio between acyl chloride and hydrophobic material is preferably between 0.01 and 0.2, preferably between 0.01 and 0.09, more preferably between 0.03 and 0.07. According to one embodiment, the molar ratio between the NH2 functional group of the amino compound and the COCI functional group of the acyl chloride is between 0.01 and 50, preferably between 0.01 and 20, more preferably between 0.01 and 10. According to a particular embodiment, the acyl chloride of the present invention is a mixture of at least two different acyl chlorides defined in formula (I). According to a particular embodiment, the acyl chloride of the present invention defined in formula (I) can be used in combination with another acyl chloride, particularly selected from the group consisting of benzene-1,3,5-tricarbonyl chloride, benzene-1,2,4-tricarbonyl trichloride, benzene-1,2,4,5-tetracarbonyl tetrachloride, cyclohexane-1,3,5-tricarbonyl trichloride, isophthalyol dichloride, 2,2'-oxydiacetyl chloride (diglycolyl dichloride), succinic dichloride, and mixtures thereof. Hydrophobic material According to one modality, the hydrophobic material is a hydrophobic active ingredient. According to a preferred embodiment, the active ingredient comprises a perfume oil or a flavor oil. Alternative ingredients that could benefit from encapsulation could be used instead of, or in combination with, a perfume or flavor. Non-limiting examples of such ingredients include a cosmetic, skin care, odor-detergent, bactericidal, fungicidal, pharmaceutical, or agrochemical ingredient, a disinfectant, an insect repellent or attractant, and a mixture thereof. The nature and type of insect repellent or attractant that may be present in the internal hydrophobic phase does not warrant a more detailed description here, which in any case would not be exhaustive; the person experienced in the technique can select them based on their general knowledge and according to the intended use or application. rncn Ln / zznz / E / YiAi Examples of such insect repellents or attractants are birch, DEET (N,N-diethyl-m-toluamide), lemon eucalyptus (Corymbia citriodora) essential oil and its active compound p-menthane-3,8-diol (PMD), icaridin (hydroxyethyl isobutyl piperidine carboxylate), nepelactone, citronella oil, neem oil, swamp myrtle (Myrica gale), dimethyl carbate, tricyclodecenyl ether, IR3535 (3-[N-butyl-N-acetyl]-aminopropionic acid), ethyl ester, ethylhexanediol, dimethyl phthalate, metofluthrin, indalone, SS220, anthranilate-based insect repellents, and mixtures thereof. Perfume (or perfume oil) here refers to an ingredient or composition that is a liquid at approximately 20°C. According to any of the above definitions, perfume oil may be a single fragrance ingredient or a mixture of ingredients forming a fragrance composition. A fragrance ingredient here refers to a compound used primarily to impart or modulate an odor. In other words, for an ingredient to be considered a perfume, it must be recognized by someone skilled in the art as capable of positively or pleasantly imparting or modifying the odor of a composition, and not merely as having an odor of its own.For the purposes of the present invention, a perfume oil also includes combinations of perfume ingredients with substances that together improve, enhance, or modify the delivery of the perfume ingredients, such as perfume precursors, emulsions, or dispersions, as well as combinations that impart an additional benefit beyond modifying or imparting an odor, such as long-lasting fragrance, blooming, neutralizing bad odors, antimicrobial effect, microbial stability, and pest control. The nature and type of fragrance ingredients present in the oil phase do not warrant a more detailed description here, which in any case would not be exhaustive. A person experienced in the technique is able to select them based on their general knowledge and according to the intended use or application and the desired organoleptic effect. Generally speaking, these fragrance ingredients belong to chemical classes as varied as alcohols, lactones, aldehydes, zeotones, esters, ethers, acetates, nitriles, thiols, terpenoids, nitrogenous or sulfurous heterocyclic compounds, and essential oils. Fragrance co-ingredients can be of natural or synthetic origin. Many of these co-ingredients are listed in reference texts such as S. Arctander's book, *Perfume and Flavour Chemicals*, 1969, Montclair, New Jersey, USA., or its more recent versions, or in other works of a similar nature, as well as in the abundant patent literature in the field of perfumery. In particular, one can cite perfumery ingredients that are commonly used in perfume formulations, such as: - Aldehyde ingredients: decanal, dodecanai, 2-methylundecanal, 1O-undecenal, octanal, nonanal and / or nonenal; - Herbal ingredients: eucalyptus oil, camphor, eucalyptol, 5-methyltricyclo[6.2.1.0~2,7-]undecan-4-one, l-methoxy-3-hexanethiol, 2-ethyl-4,4-dimethyl-l,3-oxathian, 2,2,7 / 8,9 / 10-tetramethylspiro[5.5]undec-8-en-l-one, menthol and / or alpha-pinene; - Balsamic ingredients: coumarin, ethyl vanillin and / or vanillin; - Citrus ingredients: dihydromyrcenol, citral, orange oil, linalyl acetate, citronellyl nitrite, orange terpenes, limonene, lp-menten-8-yl acetate and / or 1,4(8)-p-mentadiene; Floral ingredients: methyl dihydrojasmonate, linalool, citronellol, phenylethanol, 3-(4-terc-butylphenyl)-2methylpropanal, hexylcinnamic aldehyde, benzyl acetate, benzyl salicylate, tetrahydro-2-isobutyl-4-4-4-pyranol, pyranol, and 2-(methylamino)methyl benzoate, (E) 3-methyl-4-(2,6,6-trimethyl-2-cyclohexen-l-yl)-3-butene-2-one, rncn Ln / zznz / E / YiAi (ΙΕ)-1- (2,6,6-trimethyl-2-cyclohexene-l-yl)-l-penten-3-one, 1(2,6,6-trimethyl-l,3-cyclohexadiene-l-yl)-2-butene-l-one, (2E)1- (2,6,6-trimethyl-2-cyclohexen-l-yl-yl-one, (2E)-1[2, 6,6-trimethyl-3-ciclohexen-l-yl] -2-butene-l-one, (2E) -1(2,6,6-trimethyl-l-ciclohexen-l-yl)-2-butene-l-one, 2,5dimethyl-2-indanmethanol, 2,6,6-trimethyl-3-cyclohexenol-lcarboxylate, 3- (4,4-dimethyl-l-cyclohexen-l-yl)propanal, hexyl salicylate, 3,7-dimethyl-l,6-nonadien-3-ol, 3-(4isopropylphenyl-2-propanel, demetallic green geraniol, p-menth-l-en-8-ol, 4-(1,1-dimethylethyl)1-cyclohexyl acetate, 1,l-dimethyl-2-phenylethyl acetate,4ciclohexil-2-metil-2-butanol, salicilato de amyl, dihidrojasmonato de metilo alto en cis, 3-metil-5-fenil-1pentanol, propionato de verdilo, acetato de geranilo, tetrahidrolinalol, cis-7-p-metanol, (3)-2-(1,1dimetilpropoxi)propanoato de propilo, 2-metoxinaftaleno, acetato de 2,2,2-tricloro-l-feniletilo, 4 / 3-(4-hidroxi-4metilpentil)-3-ciclohexeno-l-carbaldehido, aldehido amilcinámico, 8-decen-5-o 1 i do , 4 - f en i 1 - 2-bu t anona , acetato de isononil, acetato de 4 -(1, 1-dimethylethyl)-1cyclohexylo, verdigris isobutyrate and / or mixture of methylionone isomers;, Ingredientes afrutados: gamma-undecalactona, 2,2,5trimetil-5-pentilciclopentanona, 2-metil-4-propil-l,3oxatiano, 4-decanolida, 2-metil-pentanoato de ethylo, acetato rncn Ln / zznz / E / YiAi de hexilo, 2-metilbutanoato de ethylo, gamma-nonalactona, heptanoato de alilo, isobutyrato de 2-fenoxietilo, 2-metil1,3-dioxolano-2-acetato de ethylo, 3- (3,3 / 1,l-dimetil-5indanil)propanal, 1,4-ciclohexanodicarboxilato de diethylo, acetato de 3-metil-2-hexen-l-ilo, [ 3-etil-2-oxiranil]acetato de 1-[3,3-dimethylcyclohexyl]ethyl y / o dicarboxylate of diethyl 1,4-cyclohexane; - Green ingredients: 2-methyl-3-hexanona(E)-oxime, 2,4dimethyl-3-cyclohexeno-l-carbaldehyde, 2-tertbutyl-l-cyclohexylo acetate, estiralilo acetate, (2methylbutoxy)aliloacetate, 4-methyl-3-decen-5-ol, diphenyl ether, (Z)-3-hexen-1-ol y / o 1-(5,5-dimethyl-1-cyclohexen-1-yl)4-penten-1-one; Musk ingredients: 1,4-dioxa-5,17cycloheptadecanedione, (Z)-4-cyclopentadecen-l-one, 3methylcyclopentadecanone, l-oxa-12-cyclohexadecen-2-one, 1oxa-13-cyclohexadecen-2-one, (9Z)-9-cycloheptadecen-l-one, 2(1S)-1-[(IR)-3,3-dimethylcyclohexyl]ethoxy}-2-oxoethyl propionato 3-methyl-5-cyclopentadecen-l-one, 1,3, 4,6,7,8-hexahydro4,6,6,7,8,8-hexamethyl-cyclopenta-g-2-benzopyrano,propanoate de (1S,l'R)-2-[1-(3',3' -dimethyl-1'-cyclohexyl)ethoxy]-2-methylpropyl, oxacyclohexadecan-2-one and / or (1S,1'R)-[1-(3',3'dimethyl-1'-cyclohexyl)ethoxycarbonyl]-methyl propanoate; Wood ingredients: 1-[(1RS,6SR)-2,2,6trimethylcyclohexyl]-3-hexanol, 3,3-dimethyl-5-[(IR)-2,2,3rncn Ln / zznz / E / YiAi trimethyl-3-cyclopenten-l-yl]-4-2-penethenol,3'o oxirane-2,9'-tricyclo[6.2.1.02·7] undec [ 4 ] eno, (1ethoxyethoxy)cyclododecane, 2,2,9,11tetramethi1espiro[5.5]undec-8-en-l-ilo acetate, 1-(octahydro-2,3,8,8tetramethyl-2-naphthalenyl)-1-ethanone, patchouli oil, patchouli oil terpene fractions, clearwood®, (1'R,E)-2-ethyl-4-(2',2',3'-trimethyl-3'-ciclo-pentenyl-2',l-2' 2-ethyl-4-(2,2,3-trimethyl-3-cyclopenten-l-yl)-2buten-l-ol, methyl cedryl ketone, 5- (2,2,3-trimethyl-3cyclopentenyl)-3-methylpentan-2-ol, 1-(2,3,8,8-tetramethyl1,2,3,4,6,7,8,8a-octahydronaphthalene-2-yl)ethane-l-one y / o isobornyl acetate; - Other ingredients (for example, amber, spiced powder or aqueous): dodecahydro-3a,6,6,9a-tetramethyl-naphtho[2,1b]furan and any of its stereoisomers, heliotropin, anisaldehyde, eugenol, cinnamic aldehyde, clove oil, 3-(1,3-benzodioxol-5-yl)-2-methylpropanal, 7-methyl-2H1,5-benzodioxepin-3(4H)-one, 2,5,5-trimethyl-1-1,2,3,4,4a,5,6,7octahydro-2-naphthalene, 1-phenylvinyl acetate, 6-methyl-7oxa-l-thia-4-azaespiro[4,4]nonan and / or 3-(3-isopropyl-l-phenyl)butanal. According to a particular modality, the perfume ingredients have a high spherical hindrance and are in particular those of one of the following groups: - Group 1: Perfume ingredients comprising a cyclohexane, cyclohexene, cyclohexanone or cyclohexenone ring substituted with at least one linear or branched C4 alkyl or alkenyl substituent; - Group 2: perfume ingredients comprising a cyclopentane, cyclopentene, cyclopentanone or cyclopentenone ring substituted with at least one linear or branched C4a Cg alkyl or alkenyl substituent; - Group 3: Perfume ingredients comprising a phenyl ring or perfume ingredients comprising a cyclohexane, cyclohexene, cyclohexanone or cyclohexenone ring substituted with at least one linear or branched C5a C8 alkyl or alkenyl substituent or with at least one phenyl substituent and optionally one or more linear or branched C4a Cg alkyl or alkenyl substituents; - Group 4: perfume ingredients comprising at least two fused or joined C5 and / or Cg rings; - Group 5: perfume ingredients comprising a camphor-type ring structure; - Group 6: perfume ingredients comprising at least one C7 to C20 ring structure; - Group 7: perfume ingredients having a logP value greater than 3.5 and comprising at least one tere-butyl or at least one trichloromethyl substituent; Examples of ingredients from each of these groups rnen ίη / 77Π7 / E / γΐΛΐ Group 1: 2,4-dimethyl-3-cyclohexene-l-carbaldehyde (origin: Firmenich SA, Geneva, Switzerland), Isocyclocitral, menthone, isomenthone, methyl 2,2-dimethyl-6-methylene-lcyclohexanecarboxylate (origin: Firmenich SA, Geneva, Switzerland), nerone, terpineol, dihydroterpineol, terpenyl acetate, terpenyl acetate dihi dr o te rpen i 1 o , dipentene, eucalyptol, hexylate, rose oxide, (S)-l,8-pmentadiene-7-ol (origin: Firmenich SA, Geneva, Suiza), 1-p-men t eno - 4-o 1, acetate de (1RS, 3RS, 4SR) -3-pmentañilo, (lR,2S,4R)-4,6,6-trimethyl-bicyclo[3.1.1]heptan-2ol, tetrahydro-4-methyl-2-phenyl-2H-pyran (origen: Firmenich SA, Ginebra, Suiza), cyclohexil acetate, cyclanol acetate, diethyldicarboxylate de 1,4-cyclohexane (origen: Firmenich SA, Ginebra, Suiza), (3ARS,6SR,7ASR)perhidro-3,6dimethyl-benzo[B]furan-2-ona (origen: Firmenich SA, Ginebra, Suiza), (6R)-perhidro-3,6-dimethyl-benzo[B]furan-2-ona (origen: Firmenich SA, Ginebra, Suiza), 2,4,6-trimethyl-4phenyl-1,3-dioxane, 2,4,6-trimethyl-3-cyclohexeno-lcarbaldehido; - Group 2: (E)-3-methyl-5-(2,2,3-trimethyl-3-cyclopentene1-yl)-4-penten-2-ol (origin: Givaudan SA, Vernier, Switzerland), (1'R,E)-2-ethyl-4-(2',2',3'-trimethyl-3'-olcil-penten-yl-2') (origin: Firmenich SA, Geneva, Switzerland), (l'R,E)3,3-dimethyl-5-(2',2',3'-trimethyl-3'-cyclopentene-1'-11)-4penten-2-ol (origin: Firmenich SA, Geneva, Switzerland), methyl-cis-3-oxo-2-pentyl-lcyclopentane acetate (origin: Firmenich SA, Geneva, Switzerland), 2,2,5trimethyl-5-pentyl-l-cyclopentanone (origin: Firmenich SA, Geneva, Switzerland), 3,3-dimethyl-5-(2,2,3-trimethyl-3-cyclopentene1-yl)-4-penten-2-ol, origin: Firmenich SA, Geneva, Switzerland), 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-l-yl)-2-pentanol (origin SA, Givaudan, Vernier); Group 3: damascones, 1-(5, 5-dimethyl-l-cyclohexene-lil)-4-penten-l-one (origin: Firmenich SA, Geneva, Switzerland), necthalactone ((l'R)-2-[2-(4'-methy1-3'-cyclohexen-1-)propentanone] alpha-ionone, beta-ionone, damascenone, mixture of 1-(5,5-dimethyl-l-cyclohexen-l-yl)-4penten-l-one and 1-(3,3-dimethyl-l-cyclohexen-l-yl)-4-pentenone (origin: Firmenich SA, Geneva), Switzerland 1-(2,6,6trimethyl-l-cyclohexene-l-ilo)-butene-2-l-one (origin: Firmenich SA, Geneva, Switzerland), propanoate of (1S,1'R)-[1-(3,3'-Dimethyl1'-cyclohexyl)ethoxycarbonyl]methyl (origin: Firmenich SA, Geneva, Switzerland). Geneva, Switzerland), 2-tert-butyl-l-cyclohexyl acetate (origin: International Flavors and Fragrances, EUA), 1(2,2,3, 6-tetramethyl-cyclohexyl)-3-hexanol (origin: Firmenich SA, Geneva, Switzerland), trans-1-(2,2,6-trimethyl-l-cyclohexyl)-3hexanol (origin: Firmenich SA, Geneva, Switzerland), (E)-3-methyl4-(2,6,6-trimethyl-2-cyclohexen-l-yl)-3-buten-2-one, terpenyl isobutyrate, 4-(1,1-dimethylethyl)-1-cyclohexyl acetate (origin: Firmenich SA, Geneva, Switzerland), 8-methoxymethylene glycol Ln / zznz / E / YiAi 1-p-mentheno, (lS,l,R)-2-[l-(3',3'-dimetil-1' ciclohexil)etoxi]-2-metilpropil propanoato de metilo, origen: Firmenich SA, Ginebra, Suiza), para-terc-butilciclohexanona, mentenothiol, l-metil-4-(4-metil-3-pentenil)-3-ciclohexeno-lcarbaldehido, ciclohexilpropionato de alyl, salicilato de ciclohexilo, metil carbonato de 2-metoxi-4-metilfenilo, 2metoxi-4-metilfenil carbonato de ethylo, carbonato de 4-etil2-metoxifenil metilo; - Group 4: Methyl cedryl ketone (origin: International Flavors and Fragrances, USA), a mixture of (1RS,2SR6RS,7RS,8SR)-tricyclo[5.2.1.0~2,6~]dec-3-en-8-yl 2-methylpropanoate and (1RS,2SR,6RS,7RS,8SR)-tricyclo[5.2.1.0~2,6~]dec-4-en-8-yl 2-methylpropanoate, vetiverol, vetiverone, 1-(octahydro-2,3,8,8-tetramethyl-2-naphthalenyl)-1-ethanone (origin: International Flavors and Fragrances, USA), (5RS,9RS,10SR)-2,6,9,10-tetramethyl-l-oxaspiro[4.5]deca-3,6diene and the isomer (5RS,9SR,10RS), 6-ethyl-2,10,10-trimethyl-loxaspiro[4.5]deca-3,6-diene, 1,2,3,5,6,7-hexahydro-1,1,2,3,3-pentamethyl-4-indenone (origin: International Flavors and Fragrances, USA), a mixture of 3-(3,3-dimethyl-5-indanyl)propanal and 3-(1,1-dimethyl-5-indanyl)propanal, origin: Firmenich SA, Geneva, Switzerland), 3',4-dimethyltricyclo[6.2.1.0(2.7)]undec-4-ene-9-spiro-2'-oxirane (origin: Firmenich SA, Geneva, Switzerland), 9 / 10-ethyldiene-3-oxatricyclo[6.2.1.0(2.7)]undecane, acetate of perhydro rncn Ln / zznz / E / YiAi 5,5,8A-trimethyl-2-naphthalenyl (origen: Firmenich SA, Ginebra, Suiza), octalinol, (dodecahidro-3a,6,6,9a-tetramethylnaphtho[2,1-b]furan (origen: Firmenich SA, Ginebra, Suiza), acetate de tricyclo[5.2.1.0(2,6)]dec-3-en-8-ilo and tricyclo acetate[5.2.1.0(2,6)]dec-4-en-8-ilo as well as tricyclo propanoate[5.2.1.0 (2,6)]dec-3-en-8-ilo and tricyclo propanoate [5.2.1.0(2,6)]dec-4-en-8-ilo, (+)-(1S,2S,3S)-2,6,6-trimethylbiciclo[3.1.1]heptaño-3-espiro-2'-ciclohexen-4'-ona; - Group 5: alcanfor, borneol, isobornyl acetate, 8-isopropyl-6-methyl-bicyclo[2.2.2]oct-5-eno-2-carbaldehyde, pinene, campheno, 8-methoxycedrano, (8-methoxy-2,6,6,8tetrametil-trícícío[5.3.1.0(1,5)]undecane (origen: Firmenich SA, Ginebra, Suiza), cedreno, cedrenol, cedrol, mezcla de 9etiliden-3-oxatriciclo[6.2.1.0(2,7)]undecan-4-ona y 10etiliden-3-oxatriciclo[6.2.1.0(2,7)]undecan-4-ona, origen: Firmenich SA, Ginebra, Suiza), 3-methoxy-7,7-dimethyl-10-methylenebicyclo[4.3.1]decane (origen: Firmenich SA, Ginebra, Suiza); - Group 6: (trimethyl-13-oxabicyclo-[10.1.0]-trideca-4,8dieno (origin: Firmenich SA, Geneva, Switzerland), Ambrettolide LG ((E)-9-hexadecen-16-olida (origin: Firmenich SA, Geneva, Switzerland)), pentadecenolida (origin: Firmenich SA, Geneva, Switzerland), muscenolide (3-methyl-(4 / 5)-cyclopentadecenone, origin: Firmenich SA, Geneva, Switzerland), 3-methylcyclopentadecanone (origin: Firmenich SA, Geneva, Switzerland), pentadecanolide (origin: Firmenich SA, Geneva, Switzerland), cyclopentadecanone (origin: Firmenich SA, rncn Ln / zznz / E / YiAi Ginebra, Suiza), 1-ethoxietoxi)cyclododecane (origen: Firmenich SA, Ginebra, Suiza), 1-4,dioxacycloheptadecan5,17-diona, 4,8-cyclododecadien-l-ona; - Group 7: (+ -)-2-methyl-3-[4 -(2-methyl-2-propanyl-2propanyl)phenyl]propanal (origen: Givaudan SA, Vernier, Suiza), 2,2,2-trichloro-l-phenylethyl acetate. According to one embodiment, the perfume comprises at least 30%, in particular at least 50%, and more specifically at least 60% of ingredients selected from Groups 1 to 7, as defined above. According to one embodiment, the perfume comprises at least 30%, in particular at least 50% of ingredients from Groups 3 to 7, as defined above. According to one modality, the perfume comprises at least 30%, in particular at least 50% of ingredients from Groups 3, 4, 6 or 7, as defined above. According to one modality, the perfume comprises at least 30%, in particular at least 50%, more particularly at least 60% of ingredients having a logP greater than 3, in particular greater than 3.5 and even more particularly greater than 3.75. According to one embodiment, the perfume used in the invention contains less than 10% by weight of primary alcohols, less than 15% by weight of secondary alcohols, and less than 20% by weight of tertiary alcohols. According to another embodiment, the perfume used in the invention contains no primary alcohols and contains less than 15% of secondary and tertiary alcohols. It should also be understood that the perfuming ingredients can also be made up of ingredients that are known to release in a controlled manner different types of perfuming compounds that are also known as proper fumes or fragrances. Non-limiting examples of suitable smokes may include 4-(dodecylthio)-4-(2,6,6-trimethyl-2-cyclohexen-l-yl) 2-butanone, 4-(dodecylthio)-4-(2,6,6-trimethyl-l-cyclohexen-lyl)-2-butanone, trans-3-(dodecylthio)-1-(2, 6,6-trimethyl-3cyclohexen-l-yl)-1-butanone, 2-(dodecylthio)octane-4-one, 2-phenylethyl oxo(phenyl)acetate, 3,7dimethylocta-2,6-dien-l-yl oxo(phenyl)acetate, (Z)-hex-3-oxo(phenyl)acetate de en-l-yl, hexadecanoate de 3,7-dimethyl-2,6-octadien-l-yl, bis(3,7-dimethylocta-2,6-dien-l-yl) succinate, (2-((2methylundec-l-en-l-yl)oxy)ethyl)bencene, l-methoxy-4-(3-methyl-4-phenetoxybut-3-en-l-yl)bencene, (3-methyl -4-phenetoxybut-3-en-l-yl)bencene, 1-( ( (Z)-hex-3-en-l-yl)oxy)-2-methylundec-l-eno, (2-((2 -methylundec-l-en-l-yl)oxy)ethoxy)bencene,2-methyl-l(octane-3-yloxy)undec-l-eno, l-methoxy-4-(1-phenethoxyprop-l-en2-yl)benzene, l-methyl-4-(l-phenethoxyprop-l-en-2-yl)benzene, 2(l-phenethoxyprop-l-naphthalene,2)) (2phenethoxyvinyl)benzene, 2- (1-((3,7-dimethyloct-6-en-ylyl)oxy)prop-l-en-2-yl)naphthalene, (2-((2rncn Ln / zznz / E / YiAi pentylcyclopentylidene)methoxy)ethyl)benzene or a mixture of the same. The fragrance ingredients may be dissolved in a solvent commonly used in the perfume industry. According to one embodiment, the solvent is not an alcohol. Examples of such solvents are diethyl phthalate, isopropyl myristate, Abalyn® (rosin resins, available from Eastman), benzyl benzoate, ethyl citrate, limonene or other terpenes, or isoparaffins. According to one embodiment, the solvent is highly hydrophobic and highly spherically hindered, such as Abalyn® or benzyl benzoate. According to one embodiment, the perfume comprises less than 30% solvent. According to another embodiment, the perfume comprises less than 20%, and even more particularly less than 10%, solvent; all these percentages are defined by weight relative to the total weight of the perfume. According to another embodiment, the perfume is essentially solvent-free. According to one modality, the oil phase (or oil core) comprises: - 25-100% by weight of a perfume oil comprising at least 15% by weight of high-impact perfume raw materials having a Log T<-4, and 0-75% by weight of a density compensation material having a density greater than 1.07 g / cm3. rncn Ln / zznz / E / YiAi The nature of high-impact perfume raw materials having a Log T<-4 and density equilibrium material having a density greater than 1.07 g / cm3 are described in document WO 2018 / 115250, the content of which is included by reference. According to one particular embodiment, the hydrophobic material is free of any active ingredient (such as perfume). According to this particular embodiment, it comprises, preferably consists of, hydrophobic solvents, preferably selected from the group consisting of isopropyl myristate, triglycerides (e.g., Neobee® MCT oil, vegetable oils), D-limonene, silicone oil, mineral oil, and mixtures thereof with optionally hydrophilic solvents, preferably selected from the group consisting of 1,4-butanediol, benzyl alcohol, triethyl citrate, triacetin, benzyl acetate, ethyl acetate, propylene glycol (1,2-propanediol), 1,3-propanediol, dipropylene glycol, glycerol, glycol ethers, and mixtures thereof. Flavor (or flavor oil) herein means a flavoring ingredient or a mixture of flavoring ingredients, solvents, or adjuvants commonly used in the preparation of a flavoring formulation, that is, a particular mixture of ingredients intended to be added to an edible composition or chewable product to impart, enhance, or modify its organoleptic properties, particularly its flavor and / or taste. Taste modulator is also included in the definition. Flavoring ingredients are well known to a person skilled in the art, and their nature does not warrant a detailed description here, which in any case would not be exhaustive. A skilled person is capable of selecting them based on their general knowledge and in accordance with the intended use or application and the desired organoleptic effect.Many of these flavoring ingredients are listed in reference texts such as S. Arctander's book, Perfume and Flavor Chemicals, 1969, Montclair, NJ, USA, or its more recent versions, or in other works of a similar nature such as Fenaroli's Handbook of Flavor Ingredients, 1975, CRC Press or Synthetic Food Adjuncts, 1947, by MB Jacobs, Can Nostrand Co., Inc. The solvents and adjuvants or their actual use for the preparation of a flavoring formulation are also well known in the art. In one particular modality, the flavor is selected from the group consisting of terpene flavors that include citrus and peppermint oil, and sulfur flavors. The term biocide refers to a chemical substance capable of killing living organisms (e.g., microorganisms) or reducing or preventing their growth and / or accumulation. Biocides are commonly used in medicine, agriculture, forestry, and industry, where they prevent contamination of, for example, water, agricultural products (including seeds), and pipelines. A biocide can be a pesticide, including a fungicide, herbicide, insecticide, algaecide, molluscicide, acaricide, and rodenticide; and / or an antimicrobial such as a germicide, antibiotic, antibacterial, antiviral, antifungal, antiprotozoal, and / or antiparasitic. As used herein, a pest control agent refers to a substance that repels or attracts pests, or reduces, inhibits, or promotes their growth, development, or activity. Pests are any living organism—animal, plant, or fungus—that is invasive or troublesome to plants or animals. Pests include insects, particularly arthropods, mites, spiders, fungi, weeds, bacteria, and other microorganisms. Amino Compound The amino compound is preferably selected from the group consisting of an amino acid (such as L-lysine, L-lysine ethyl ester, L-arginine, L-histidine, L-tryptophan, L-serine, L-glutamine, L-threonine), guanidine carbonate, chitosan, 3-aminopropyltriethoxysilane, xylylenediamine, 1,2-diaminocyclohexane, 1,4-diaminocyclohexane, polyetheramines (Jeffamine®), ethylenediamine, diethylenetriamine, spermine, spermidine, polyamidoamine (PAMAM), guanidine carbonate, chitosan, tris-(2-aminoethyl)amine, 3-aminopropyltriethoxysilane, an amine having a disulfide bond such as cystamine, cystamine hydrochloride, cystine, cystine hydrochloride, dialkyl cystine ester, dialkyl cystine ester hydrochloride and mixtures thereof. According to a particular modality, the shell comprises two different amino compounds, namely a first amino compound and a second amino compound. According to a particular modality, the first amino compound is an amino acid, preferably chosen from the group consisting of L-Lysine, L-Arginine, L-Histidine, L-Tryptophan, L-Serine, L-Glutamine, L-Threonine and mixtures thereof, preferably L-Lysine, L-Arginine, L-Histidine, L-Tryptophan and mixtures thereof, more preferably L-Lysine, L-Arginine, L-Histidine and mixtures thereof. The amino acid preferably has two nucleophilic groups. The first amino compound may be chosen from the group consisting of L-lysine, L-lysine ethyl ester, guanidine carbonate, chitosan, 3-aminopropyltriethoxysilane, and mixtures thereof. According to a particular embodiment, the first amino compound is L-lysine. As non-limiting examples, the second amino compound is chosen from the group consisting of a xylenediamine, 1,2-diaminocyclohexane, 1,4-diaminocyclohexane, L-lysine, L-lysine ethyl ester, polyetheramines (Jeffamine®), ethylenediamine, diethylenetriamine, spermine, spermidine, polyamidoamine (PAMAM), guanidine carbonate, chitosan, tris-(2-aminoethyl)amine, 3-aminopropyltriethoxysilane, L-arginine, an amine having a disulfide bond such as cystamine, cystamine hydrochloride, cystine, cystine hydrochloride, cystine dialkyl ester, cystine dialkyl ester hydrochloride, and mixtures thereof. According to one modality, the second amino compound is an amine having a disulfide bond and is chosen from the group consisting of cystamine, cystamine hydrochloride, cystine, cystine hydrochloride, cystine dialkyl ester, cystine dialkyl ester hydrochloride, and mixtures thereof. According to another modality, the second amino compound is chosen from the group consisting of xylylenediamine, 1,2-diaminocyclohexane, 1,4-diaminocyclohexane, L-lysine, L-lysine ethyl ester, Jeffamine®, ethylenediamine, diethylenetriamine, spermine, spermidine, polyamidoamine (PAMAM), guanidine carbonate, chitosan, tris-(2-aminoethyl)amine, 3-aminopropyltriethoxysilane, L-arginine and mixtures thereof. According to a particular modality, the second amino compound is a mixture of two amino compounds, preferably a mixture of ethylenediamine and diethylenetriamine. According to one embodiment, the weight ratio between the first amino compound and the second amino compound is between 0.5 and 25, preferably between 1.3 and 10, more preferably between 1.3 and 7. When a first and second amino compound are present in the shell: - the molar ratio between the NH2 functional groups of the second amino compound and the COCI functional groups of the acyl chloride is preferably between 0.01 and 7.5, more preferably between 0.1 and 3.0, and / or - The NH2 functional groups of the first amino compound and the COCI functional groups of the acyl chloride are preferably between 0.2 and 3, more preferably between 0.5 and 2. Stabilizer According to one modality, the cover comprises a stabilizer. For the sake of clarity, in the present context, the term "stabilizer" or similar means the normal meaning understood by a person skilled in the art, i.e., a compound that is capable of, or is added to, stabilize the oil-in-water interface, for example, to prevent phase separation, or the aggregation or agglomeration of microcapsules, for example, during application or preparation. The use of the stabilizer is standard knowledge of a person skilled in the art. For the purposes of the present invention, the stabilizer may be an ionic or non-ionic surfactant, solid particles (pickling), or a colloidal stabilizer. The exact nature of such stabilizers is well known to a person skilled in the art. According to one modality, the stabilizer is chosen from the group consisting of gum arabic, modified starch, polyvinyl alcohol, polyvinylpyrrolidone (PVP), carboxymethylcellulose (CMC), anionic polysaccharides, acrylamide copolymer, inorganic particles, protein such as soy protein, rice protein, whey protein, egg white albumin, sodium caseinate, gelatin, bovine serum albumin, hydrolyzed soy protein, hydrolyzed sericin, pseudocollagen, silk protein, sericin powder, and mixtures thereof. According to one particular modality, the stabilizer is a biopolymer. Biopolymers are defined as biomacromolecules produced by living organisms. Biopolymers are characterized by molecular weight distributions ranging from 1,000 (thousand) to 1,000,000,000 (one billion) Daltons. These macromolecules can be carbohydrates (sugar-based) or proteins (amino acid-based) or a combination of both (gums) and can be linear or branched. According to a particular modality, the stabilizer is a biopolymer chosen from the group formed by proteins such as whey protein, casein, sodium caseinate, bovine serum albumin and mixtures thereof. According to a particular embodiment, the polyamide core-shell microcapsule comprises: - an oil-based core comprising a hydrophobic material, preferably a perfume, and - a polyamide cover comprising: • at least one acyl chloride as defined above, preferably in an amount between 5 and 98% w / w; • a first amino compound as defined above, preferably in an amount between 1% and 80% w / w; * optionally, a second amino compound as defined above, preferably in an amount between 1% and 80% w / w; rncn Ln / zznz / E / YiAi * optionally a stabilizer as defined above, preferably a biopolymer, preferably in an amount between 0 and 90% w / w. It should be understood that the total number of components of the cover is equal to 100%. According to a particular embodiment, the polyamide core-shell microcapsule comprises: - an oil-based core comprising a hydrophobic material, preferably a perfume, and - a polyamide cover comprising: • at least one acyl chloride as defined above, • a first amino compound which is an amino acid, preferably chosen from the group consisting of L-lysine, L-arginine, L-histidine, L-tryptophan and / or mixtures thereof. • a second amino compound selected from the group consisting of ethylenediamine, diethylenetriamine, cystamine and mixtures thereof, and • a biopolymer selected from the group consisting of casein, sodium caseinate, bovine serum albumin, whey protein and mixtures thereof. According to a particular modality, the polyamide core-shell microcapsule comprises an additional layer of polyurea. rncn Ln / zznz / E / YiAi Optional exterior cladding According to a particular embodiment of the invention, the microcapsules of the invention may comprise an outer coating containing a polymer selected from the group consisting of a non-ionic polysaccharide, an anionic coating, a cationic polymer, a polysuccinimidide derivative, and mixtures thereof to form an outer coating on the microcapsule. Non-ionic polysaccharide polymers are well known to persons experienced in the art and are described, for example, in WO 2012 / 007438, page 29, lines 1 to 25, and in WO 2013 / 026657, page 2, lines 12 to 19 and page 4, lines 3 to 12. The preferred non-ionic polysaccharides are selected from the group consisting of locust bean gum, xyloglucan, guar gum, hydroxypropyl guar, hydroxypropyl cellulose and hydroxypropyl methyl cellulose. Cationic polymers are well known to a person skilled in the art. Preferred cationic polymers have cationic charge densities of at least 0.5 meq / g, more preferably at least approximately 1.5 meq / g, but also preferably less than approximately 7 meq / g, and more preferably less than approximately 6.2 meq / g. The cationic charge density of cationic polymers can be determined by the Kjeldahl method as described in the U.S. Pharmacopeia under Chemical Tests for the Determination of Nitrogen. Preferred cationic polymers are selected from those containing units comprising primary, secondary, tertiary, and / or quaternary amine groups that may be part of the main polymer chain or may be supported by a side substituent directly attached thereto. The weight-average molecular weight (Mw) of the cationic polymer is preferably between 10,000 and 3.5 M Dalton, more preferably between 50,000 and 1.5 M Dalton. According to a particular embodiment, cationic polymers based on acrylamide, methacrylamide, N-vinylpyrrolidone, quaternized N,N-dimethylaminomethacrylate, diallyldimethylammonium chloride, quaternized vinylimidazole (3-methyl-l-vinyl-lH-imidazole-3-io chloride), vinylpyrrolidone, acrylamidopropyltrimonium chloride, cassia hydroxypropyltrimonium chloride, guar hydroxypropyltrimonium chloride or polygalactomannan 2-hydroxypropyltrimethylammonium chloride ether, starch hydroxypropyltrimonium chloride and cellulose hydroxypropyltrimonium chloride will be used.Preferably, the copolymers shall be selected from the group consisting of polyquaternium-5, polyquaternium-6, polyquaternium-7, polyquaternium-10, polyquaternium-11, polyquaternium-16, polyquaternium-22, polyquaternium-28, polyquaternium-43, polyquaternium-44, polyquaternium-46, cassia hydroxypropyltrimonium chloride, guar hydroxypropyltrimonium chloride or 2-hydroxypropyltrimethylammonium ether chloride, starch hydroxypropyltrimonium chloride and cellulose hydroxypropyltrimonium chloride. Specific examples of commercially available products include Saleare® SC60 (acrylamide acrylamide acrylamide cationic copolymer, source: BASF) or Luviquat®, such as PQ 11N, FC 550 or Style (polyquaternium-11 to 68 or vinylpyrrolidone quaternized copolymers: BASF), or also Jaguar® (C13S or C17, source: Rhodia). Another object of the invention is a solid particle comprising: a polymeric carrier material, preferably selected from the group consisting of polyvinyl acetate, polyvinyl alcohol, dextrins, natural or modified starch, vegetable gums, pectins, xanthan gums, alginates, carrageenans, cellulose derivatives and mixtures thereof, and microcapsules as defined above trapped in the carrier material, and - optionally free perfume trapped in the carrier material. Solid particles as defined above and microcapsule powders are used interchangeably in the present invention. rnen ίη / 77Π7 / E / γΐΛΐ POLYAMIDE MICROCAPSULE PREPARATION PROCESS Another object of the invention is a process for preparing a suspension of polyamide core-shell microcapsules comprising the following steps: a) Dissolve at least one acyl chloride in a hydrophobic material, preferably a perfume, to form an oily phase; b) Disperse the oily phase obtained in step a) in an aqueous phase to obtain an oil-in-water emulsion; c) Perform a curing step to form polyamide microcapsules in suspension form; wherein a stabilizer is added to the oil phase and / or to the aqueous phase, and wherein at least one amino compound is added to the aqueous phase before the formation of the oil-in-water emulsion and / or to the oil-in-water emulsion obtained after step b) wherein the acyl chloride has the following formula (I)0 / or \ VXK ) (I) cr \ CI / n where n is an integer ranging from 1 to 8, preferably from 1 to 6, more preferably from 1 to 4, and where X is a C3 to Ce (n+1)-valent alkyl group, or a C2 to C45 (n+1)-valent hydrocarbon group comprising rncn ίη / ζζηζ / E / γίΛΐ less a group selected from (i) to (vi), R OOO rncn Ln / zznz / E / YiAi (i) (¡i) (¡¡i) (¡v) (v) (vi) where R is a hydrogen atom or a methyl or ethyl group, preferably a hydrogen atom, on the condition that cyclohexane-1,3,5-tricarbonyl trichloride and diglycoyl chloride are excluded. In one step of the process, an oily phase is formed by mixing at least one hydrophobic material with at least one acyl chloride as defined above. Hydrophobic material is defined as above. According to any embodiment of the invention, the hydrophobic material represents between approximately 10% and 60% w / w, or even between 15% and 45% w / w, by weight, with respect to the total weight of the emulsion obtained after step b). According to a particular embodiment, an additional acyl chloride preferably chosen from the group consisting of benzene-1,3,5-tricarbonyl chloride, benzene-1,2,4-tricarbonyl trichloride, benzene-1,2,4,5-tetracarbonyl tetrachloride, cyclohexane-1,3,5-tricarbonyl trichloride, isophthalyol dichloride, diglycolyl dichloride, succinic dichloride and mixtures thereof with the acyl chloride of formula (I) to the oil phase. The weight ratio between acyl chloride and hydrophobic material is preferably between 0.01 and 0.2, preferably between 0.01 and 0.09, more preferably between 0.03 and 0.07. Acyl chloride can be dissolved directly in the hydrophobic material, preferably a perfume oil, or it can be pre-dispersed in an inert solvent such as benzyl benzoate before mixing it with the hydrophobic material. According to a particular modality, a polyisocyanate having at least two isocyanate functional groups is added to the oil phase. Suitable polyisocyanates used according to the invention include aromatic polyisocyanates, aliphatic polyisocyanates, and mixtures thereof. The polyisocyanate comprises at least two, preferably at least three, but may comprise up to six, or even only four, isocyanate functional groups. According to one particular embodiment, a triisocyanate (three isocyanate functional groups) is used. According to one modality, the polyisocyanate is an aromatic polyisocyanate. The term aromatic polyisocyanate herein means any polyisocyanate comprising an aromatic moiety. Preferably, it comprises a phenyl, toluyl, xylyl, naphthyl, or diphenyl moiety, more preferably a toluyl or xylyl moiety. Preferred aromatic polyisocyanates are biurets, polyisocyanurates, and trimethylolpropane adducts of diisocyanates, most preferably comprising one of the aforementioned specific aromatic moiety. More preferably, the aromatic polyisocyanate is a toluene diisocyanate polyisocyanurate (commercially available from Bayer under the trade name Desmodur® RC), a toluene diisocyanate trimethylolpropane adduct (commercially available from Bayer under the trade name Desmodur® L75), a xylylene diisocyanate trimethylol propane adduct (commercially available from Mitsui Chemicals under the trade name Takenate® D-110N).In a more preferred embodiment, aromatic polyisocyanate is a trimethylol propane-duct of xylylene diisocyanate. According to another embodiment, the polyisocyanate is an aliphatic polyisocyanate. The term aliphatic polyisocyanate is defined as a polyisocyanate that does not comprise any aromatic moieties. Preferred aliphatic polyisocyanates are a hexamethylene diisocyanate trimer, an isophorone diisocyanate trimer, a hexamethylene diisocyanate trimethylol propane adduct (available from Mitsui Chemicals), or a hexamethylene diisocyanate biuret (commercially available from Bayer under the trade name rncn Ln / zznz / E / YiAi). Desmodur® N 100), among which a hexamethylene diisocyanate biuret is even more preferred. According to another embodiment, the at least one polyisocyanate is presented as a mixture of at least one aliphatic polyisocyanate and at least one aromatic polyisocyanate, both comprising at least two or three isocyanate functional groups, such as a mixture of hexamethylene diisocyanate biuret with a trimethylol propane diisocyanate adduct of xylylene, a mixture of hexamethylene diisocyanate biuret with a toluene diisocyanate polyisocyanurate, and a mixture of hexamethylene diisocyanate biuret with a trimethylol propane diisocyanate adduct. Most preferably, it is a mixture of hexamethylene diisocyanate biuret with a trimethylol propane diisocyanate adduct of xylylene. Preferably, when used as a mixture, the molar ratio between aliphatic polyisocyanate and aromatic polyisocyanate is in the range of 80:20 to 10:90. According to one embodiment, the at least one polyisocyanate used in the process of the invention is present in amounts representing from 0.1 to 15%, preferably from 0.5 to 10% and more preferably from 0.8 to 6%, and even more preferably from 1 to 3% by weight based on the total amount of the oil phase. According to the process of the invention, a stabilizer is added to the oil phase and / or the aqueous phase. The stabilizer is defined as above. When the colloidal stabilizer is added to the oil phase, it is preferably chosen from the group consisting of proteins such as soy protein, rice protein, whey protein, egg albumin, sodium caseinate, gelatin, bovine serum albumin, hydrolyzed soy protein, sericin, pseudocollagen, silk protein, sericin powder, and mixtures thereof. When added to the oil phase, the stabilizer can be pre-dispersed in an inert solvent such as benzyl benzoate or can be mixed with the active ingredient, which preferably comprises a perfume oil. The stabilizer and acyl chloride can be premixed and heated to a temperature between, for example, 10 and 80°C before mixing with the hydrophobic material, which preferably comprises a perfume oil. When the colloidal stabilizer is added to the aqueous phase, it is preferably chosen from the group consisting of gum arabic, modified starch, polyvinyl alcohol, polyvinylpyrrolidone (PVP), carboxymethylcellulose (CMC), anionic polysaccharides, acrylamide copolymer, inorganic particles, proteins such as soy protein, rice protein, whey protein, egg white albumin, sodium caseinate, gelatin, bovine serum albumin, hydrolyzed soy protein, hydrolyzed sericin, pseudocollagen, silk protein, sericin powder, and mixtures thereof. According to any of the preceding embodiments of the present invention, the emulsion comprises from approximately 0.01% to 3.0% of at least one stabilizer, the percentage being expressed as a weight / weight percentage relative to the total weight of the oil-in-water emulsion as obtained after step b). In yet another aspect of the invention, the emulsion comprises from approximately 0.05% to 2.0%, preferably from 0.05% to 1%, of at least one colloidal stabilizer. In another aspect of the invention, the emulsion comprises from approximately 0.1% to 1.6%, preferably from 0.1% to 0.8% by weight, of at least one colloidal stabilizer. According to the process of the invention, at least one amino compound is added to the aqueous phase before the formation of the oil-in-water emulsion and / or in the oil-in-water emulsion obtained after step b). The nature of the amino compound is defined as above. According to a particular embodiment, the oily phase of step a) is dispersed in an aqueous phase comprising a first amino compound and optionally a stabilizer to form an oil-in-water emulsion. According to another embodiment, the oily phase of step a) is dispersed in an aqueous phase comprising two amino compounds and optionally a stabilizer to form an oil-in-water emulsion. The emulsion can be prepared by high-shear mixing and adjusted to the desired droplet size. The average droplet size of the emulsion is preferably between 1 and 1000 microns, more preferably between 1 and 500 microns, and even more preferably between 5 and 50 microns. The first amino compound is defined as above. According to one modality, in another step of the process according to one modality, a second amino compound is added to the oil-in-water emulsion obtained in step b). The second amino compound was defined as above. According to a particular modality, the process comprises the following steps: i) Dissolve at least one acyl chloride in a hydrophobic material, preferably a perfume, to form an oily phase; ii) Dispersing the oily phase obtained in step a) in an aqueous phase comprising a first amino compound to obtain an oil-in-water emulsion; iii) Adding a second amino compound to the oil-in-water emulsion; and iv) Performing a curing step to form polyamide microcapsules in suspension form; where a stabilizer is added to the oil phase and / or the aqueous phase, and where acyl chloride is defined as above. Without being limited by any theory, the inventors believe that when two amino compounds are added during the process, the first amino compound will react with the acyl chloride to form a polyamide and the second amino compound will react with the remaining acyl chloride groups of the acyl chloride. According to a particular modality, the first amino compound and the second amino compound are the same. According to another particular modality, the first amino compound and the second amino compound are different. According to one embodiment, the weight ratio between the first amino compound and the second amino compound is between 0.5 and 25, preferably between 1.3 and 10, more preferably between 1.3 and 7. According to a particular embodiment, two amino compounds are added, preferably sequentially, during the process. The first amino compound is added in step b) to the aqueous phase, and preferably at least a second amino compound is added once the emulsion has formed. In fact, without being limited by any theory, the inventors observed that the combination of both amino compounds resulted in stable microcapsules in consumer products. The amount of the second amino compound used is normally adjusted so that the molar ratio between the NH2 functional groups of the second amino compound and the COCI functional groups of the acyl chloride is between 0.01 and 7.5, preferably between 0.1 and 3.0. The amount of the first amino compound used is normally adjusted so that the molar ratio between the NH2 functional groups of the first amino compound and the COCI functional groups of the acyl chloride is between 0.2 and 3, preferably between 0.5 and 2. According to one method, a base is added at the end of step b) to adjust the pH. Non-limiting examples include guanidine carbonate, sodium bicarbonate, or triethanolamine. According to a particular modality, the base is not an amino compound. The base is preferably added in an amount between 0.1% and 10% by weight with respect to the oil-in-water emulsion, more preferably between 0.5% and 5%. This is followed by a curing step c) which allows the microcapsules to be formed into a suspension. According to a preferred embodiment, to improve the kinetics, the step is carried out at a temperature between 5 and 90°C, possibly under pressure, for 1 to 8 hours. More preferably, it is carried out between 10 and 80°C for between 30 minutes and 5 hours. According to a particular embodiment of the invention, at the end of step d) or during step d), a polymer selected from the group consisting of a nonionic polysaccharide, an anionic coating, a cationic polymer, a polysuccinimidide derivative, and mixtures thereof, may also be added to the suspension of the invention to form an outer coating of the microcapsule. The nonionic polysaccharides or cationic polymers are defined as above. According to any of the preceding embodiments of the invention, a quantity of polymer described above is added, comprising between approximately 0% and 5% w / w, or even between approximately 0.1% and 2% w / w, the percentage being expressed on a w / w basis in relation to the total weight of the suspension obtained after step c) or d). It is clearly understood by a person skilled in the art that only a portion of the added polymers will be incorporated / deposited on the microcapsule coating. Another object of the invention is a process for preparing a microcapsule powder comprising the steps defined above and an additional step (d) or (e) consisting of subjecting the suspension obtained in step (c) or (d) to spray drying to provide the microcapsules as such, i.e., in powder form. It is understood that any standard method known to a person skilled in the art for carrying out the drying is also applicable. In particular, the suspension may be spray dried, preferably in the presence of a polymeric carrier material such as polyvinyl acetate, polyvinyl alcohol, dextrins, natural or modified starch, vegetable gums, pectins, xanthan gums, alginates, carrageenans, or cellulose derivatives, to provide microcapsules in powder form. According to a particular modality, the carrier material contains free perfume oil, which may be the same as or different from the perfume of the microcapsule core. Another object of the invention is a suspension of polyamide microcapsules that can be obtained by the process described above. MULTI-CAPSULE SYSTEM According to one embodiment, the microcapsules of the invention (first type of microcapsules) can be used in combination with a second type of microcapsules. Another object of the invention is a microcapsule administration system comprising: the microcapsules of the present invention as a first type of microcapsule, and - a second type of microcapsules, wherein the first type of microcapsules and the second type of microcapsules differ in their hydrophobic material and / or their wall material and / or their coating material. PERFUME COMPOSITION / CONSUMER PRODUCTS The microcapsules of the invention can be used in combination with active ingredients. Therefore, the invention relates to a composition comprising: (i) microcapsules as defined above; (ii) an active ingredient, preferably chosen from the group consisting of a cosmetic ingredient, skin care ingredient, perfume ingredient, flavor ingredient, odor-counteracting ingredient, bactericidal ingredient, fungicidal ingredient, pharmaceutical or agrochemical ingredient, a disinfectant ingredient, an insect repellent or attractant, and mixtures thereof. The microcapsules of the invention can be used for the preparation of perfume or flavoring compositions that are also the subject of the invention. The capsules of the invention show good performance in terms of stability in challenging environments. rncn Ln / zznz / E / YiAi Another object of the present invention is a perfume composition comprising: (i) microcapsules as defined above, wherein the oil comprises a perfume; (ii) at least one ingredient selected from the group consisting of a perfumery carrier, a perfumery co-ingredient and mixtures thereof; (ii) optionally at least one perfumery adjuvant. Examples of liquid carriers used in perfumery include, but are not limited to, emulsifying systems (i.e., a solvent and surfactant system) or solvents commonly used in perfumery. A detailed description of the nature and types of solvents commonly used in perfumery cannot be exhaustive. However, examples of the most commonly used solvents include dipropylene glycol, diethyl phthalate, isopropyl myristate, benzyl benzoate, 2-(2-ethoxyethoxy)-1-ethanol, and ethyl citrate.For compositions comprising both a fragrance carrier and a fragrance co-ingredient, other suitable fragrance carriers besides those specified above may also be ethanol, water / ethanol mixtures, limonene or other terpenes, isoparaffins such as those known under the trade name Isopar® (origin: Exxon Chemical), or glycol ethers and glycol ether esters such as those known under the registered trademark Dowanol® (origin: Dow Chemical Company). A fragrance co-ingredient herein means a compound used in a fragrance preparation or composition to impart a hedonic effect and that is not a microcapsule as defined above.In other words, for a co-ingredient of this type to be considered a perfumer, it must be recognized by a person experienced in the technique as being able to at least impart or modify in a positive or pleasant way the smell of a composition, and not just as having a smell. The nature and type of the fragrance co-ingredients present in the fragrance composition do not warrant a more detailed description here, which in any case would not be exhaustive. A person experienced in the technique is able to select them based on their general knowledge and according to the intended use or application and the desired organoleptic effect. Generally speaking, these fragrance co-ingredients belong to chemical classes as varied as alcohols, lactones, aldehydes, zeotones, esters, ethers, acetates, nitriles, thiols, terpenoids, nitrogenous or sulfurous heterocyclic compounds, and essential oils, and the fragrance co-ingredients can be of natural or synthetic origin. Many of these co-ingredients are, in any case, listed in reference texts such as S. Arctander's book. Perfume and Flavour Chemicals, 1969, Montclair, New Jersey, USA, or its more recent versions, or in other works of a similar nature, as well as in the abundant patent literature in the field of perfumery. It is also understood that co-ingredients may also be compounds known to release various types of perfume compounds in a controlled manner. The co-ingredients can be chosen from the group consisting of 4-(dodecylthio)-4-(2,6,6-trimethyl-2cyclohexen-l-yl)-2-butanone, 4-(dodecylthio)-4-(2,6,6trimethyl1-1-cyclohexen-l-yl)-2-butanone, trans-3-(dodecylthio)1-(2,6,6-trimethyl-3-cyclohexen-l-yl)-1-butanone, 2(dodecylthio)octan-4-one, 2-phenylethyl oxo(phenyl)acetate, 3,7-dimethylocta-2,6-dien-l-yl oxo(phenyl)acetate, (Z)-hexoxo(phenyl)acetate 3-en-l-yl, 3,7dimethyl-2,6-octadien-l-yl hexadecanoate, bis(3,7-dimethylocta2,6-dien-l-yl), (2-((2-methylundec-l-en-lyl)oxy)ethyl)benzene, l-methoxy-4-(3-methyl-4-phenetoxybut-3-en1-yl)benzene,(3-methyl-4-phenetoxybut-3-en-l-yl)benzene, 1( ( (Z)-hex-3-en-l-yl)oxy)-2-methylundec-l-ene, (2- ( (2methylundec-l-en-l-yl)oxy)ethoxy)benzene, 2-methyl-l-(octan-3yloxy)undec-l-ene, l-methoxy-4-(1-phenetoxyprop-l-en-2-yl)benzene, l-methyl-4-(l-phenetoxyprop-l-en-2-yl)benzene, 2(l-phenetoxyprop-l-en-2-yl)naphthalene, (2-phenetoxyvinyl)benzene, 2-(1-((3,7-dimethyloct-6-en-lrncn Ln / zznz / E / YiAi il)oxy)prop-l-en-2-yl)naphthalene, (2-((256 pentylcyclopentylidene)methoxy)ethyl)benzene or a mixture thereof., By perfumery adjuvant, we mean here an ingredient capable of imparting an additional benefit, such as color, particular lightfastness, chemical stability, etc. A detailed description of the nature and type of adjuvant commonly used in perfume bases cannot be exhaustive, but it should be mentioned that the ingredients are well known to someone experienced in the technique. Preferably, the perfume composition according to the invention comprises between 0.01 and 30% by weight of microcapsules as defined above. The microcapsules of the invention can be used advantageously in many fields of application and can be used in consumer products. The microcapsules can be used in liquid form, applicable to liquid consumer products, as well as in powder form, applicable to powdered consumer products. According to a particular modality, the consumer product as defined above is liquid and comprises: a) from 2 to 65% by weight, with respect to the total weight of the consumer product, of at least one surfactant; b) water or a hydrophilic organic solvent miscible in water; and c) a suspension of microcapsules as defined above, d) optionally non-encapsulated perfume. According to a particular modality, the consumer product as defined above is presented in powder form and comprises: a) from 2 to 65% by weight, with respect to the total weight of the consumer product, of at least one surfactant; b) a microcapsule powder as defined above. c) optionally a perfume powder different from the microcapsules defined above. In the case of microcapsules containing a perfume oil-based core, the products of the invention, in particular, can be used in perfumed consumer products such as those belonging to the fine or functional perfumery sector. Functional perfumery includes, in particular, personal care products, including hair care, body cleansing, skin care, and hygiene products, as well as household care products, including laundry and air care products. Accordingly, another object of the present invention is a perfumed consumer product comprising, as a perfume ingredient, the microcapsules defined above or a perfume composition as defined above.The perfume element of the consumer product may be a combination of perfume microcapsules as defined above and a free or unencapsulated perfume, as well as other types of perfume microcapsules other than those described herein. In particular, a liquid consumer product comprising: a) from 2 to 65% by weight, with respect to the total weight of the consumer product, of at least one surfactant; b) water or a hydrophilic organic solvent miscible in water; and c) a perfume composition as defined above is another object of the invention. Furthermore, a powdered consumer product comprising (a) from 2 to 65% by weight, with respect to the total weight of the consumer product, of at least one surfactant; and (b) a perfume composition as defined above is part of the invention. Therefore, the microcapsules of the invention can be added as such or as part of a perfume composition of the invention to a perfumed consumer product. For clarity, it should be mentioned that a perfumed consumer product is understood to be a consumer product that is expected to provide, among other benefits, a perfumed effect on the surface to which it is applied (e.g., skin, hair, textiles, paper, or household surfaces) or in the air (air fresheners, deodorants, etc.). In other words, a perfumed consumer product according to the invention is a manufactured product comprising a functional formulation, also called a base, along with beneficial agents, including an effective quantity of microcapsules according to the invention. The nature and type of the other components of the perfumed consumer product do not warrant a more detailed description here, which in any case would not be exhaustive. A person skilled in the art is capable of selecting them based on their general knowledge and in accordance with the nature and desired effect of the product. Basic formulations of consumer products into which the microcapsules of the invention can be incorporated can be found in the abundant literature relating to such products. These formulations do not warrant a detailed description here, which in any case would not be exhaustive. A person skilled in the art of formulating such consumer products is perfectly capable of selecting the appropriate components based on their general knowledge and the available literature. rncn Ln / zznz / E / YiAi Non-limiting examples of suitable perfumed consumer products may include a perfume, such as a fine perfume, cologne, aftershave lotion, or body wash; a fabric care product, such as a liquid or solid detergent, tablets and capsules, fabric softener, dryer sheet, fabric refresher, ironing water, or bleach; a personal care product, such as a hair care product (e.g., shampoo, hair conditioner, hair coloring preparation, or hairspray), a cosmetic preparation (e.g., a vanishing cream, body lotion, or deodorant or antiperspirant), or a skin care product (e.g., a perfumed soap, shower or bath mousse, body wash, oil or gel, bath salts, or a hygiene product); an air care product, such as an air freshener or a ready-to-use powder air freshener;or a household care product, such as multipurpose cleaners, liquid or powder dishwashing products or tablets, toilet cleaners or products for cleaning various surfaces, for example, sprays and wipes intended for the treatment / renewal of textiles or hard surfaces (floors, tiles, stone floors, etc.); a hygiene product such as sanitary napkins, diapers, toilet paper.; rncn ίη / 77Π7 / E / γΐΛΐ Another object of the invention is a consumer product comprising: - an active self-care base, and - microcapsules as defined above or the perfume composition as defined above, wherein the consumer product is in the form of a personal care composition. The active bases for personal care products into which the microcapsules of the invention can be incorporated can be found in the extensive literature relating to such products. These formulations do not warrant a detailed description here, which, in any case, would not be exhaustive. A person experienced in the art of formulating such consumer products is perfectly capable of selecting the appropriate components based on their general knowledge and the available literature. The personal care composition is preferably chosen from the group consisting of a hair care product (for example, a shampoo, a hair conditioner, a coloring preparation or a hair spray), a cosmetic preparation (for example, a vanishing cream, a body lotion or a deodorant or antiperspirant), or a skin care product (for example, a perfumed soap, a shower or bath foam, a bath gel, an oil or gel, bath salts or a hygiene product); Another object of the invention is a consumer product comprising: - an active base for home care or fabric care, and microcapsules as defined above or the perfume composition as defined above, wherein the consumer product is in the form of a home care or fabric care composition. Active bases for household or fabric care products into which the microcapsules of the invention can be incorporated can be found in the extensive literature relating to such products. These formulations do not warrant a detailed description here, which, in any case, would not be exhaustive. A person experienced in the art of formulating such consumer products is perfectly capable of selecting the appropriate components based on their general knowledge and the available literature. Preferably, the consumer product comprises from 0.1 to 15% by weight, more preferably between 0.2 and 5% by weight, of the microcapsules of the present invention; these weight percentages are defined with respect to the total weight of the consumer product. Of course, the above concentrations may be adjusted according to the desired beneficial effect in each product. According to a particular modality, the consumer product in which the microcapsules are incorporated has a pH lower than 4.5. For the liquid consumer product mentioned below, by active base, it should be understood that the active base includes active materials (which normally include surfactants) and water. For the solid consumer products mentioned below, the active base should be understood to include active materials (which normally include surfactants) and auxiliary agents (such as bleaching agents, buffering agents, enhancers, soil release or suspension polymers; granulated enzyme particles, corrosion inhibitors, antifoaming agents, foam suppressants, colorants, fillers and mixtures thereof). Fabric softener An object of the invention is a consumer product in the form of a softening composition comprising: - an active fabric softening base; preferably comprising at least one active material selected from the group consisting of dialkyl quaternary ammonium salts, dialkyl ester quaternary ammonium salts (esterquats), Hamburg esterquat (HEQ), TEAQ (quaternary rncn Ln / zznz / E / YiAi triethanolamine), silicones and mixtures thereof, preferably using the active base in an amount between 85 and 99.95% by weight with respect to the total weight of the composition, a suspension of microcapsules as defined above, preferably in an amount between 0.05 and 15% by weight, more preferably between 0.1 and 5% by weight based on the total weight of the composition, - optionally free perfume oil. Liquid detergent An object of the invention is a consumer product in the form of a liquid detergent composition comprising: - an active base of liquid detergent; preferably comprising at least one active material selected from the group consisting of anionic surfactant such as alkylbenzenesulfonate (ABS), secondary alkyl sulfonate (SAS), primary alcohol sulfate (PAS), lauryl ether sulfate (LES), methyl ester sulfonate (MES) and non-ionic surfactant such as alkylamines, alkanolamide, fatty alcohol poly(ethylene glycol) ether, fatty alcohol ethoxylate (FAE), ethylene oxide (EO) and propylene oxide (PO) copolymers, amine oxides, alkyl polyglucosides, alkyl polyglucosamides, the active base preferably being used in an amount between 85 and 99.95% by weight of the total weight of the composition, a microcapsule suspension as defined above, preferably in an amount between 0.05 and 15 % by weight, more preferably between 0.1 and 5% by weight with respect to the total weight of the composition, - optionally free perfume oil. Solid detergent An object of the invention is a consumer product in the form of a solid detergent composition comprising: - a solid detergent active base; preferably comprising at least one active material selected from the group consisting of alkylbenzenesulfonate (ABS), secondary alkyl sulfonate (SAS), primary alcohol sulfate (PAS), lauryl ether sulfate (LES), methyl ester sulfonate (MES) and non-ionic surfactant such as alkylamines, alkanolamide, fatty alcohol poly(ethylene glycol) ether, fatty alcohol ethoxylate (FAE), ethylene oxide (EO) and propylene oxide (PO) copolymers, amine oxides, alkyl polyglucosides, alkyl polyglucosamides by weight based on the total weight of the composition, the active base being preferably used in an amount between 85 and 99.95% by weight relative to the total weight of the composition, - a microcapsule powder or a microcapsule suspension as defined above, preferably in an amount between 0.05 and 15% by weight, more preferably between 0.1 and 5% by weight on a rncn iη / 77P7 / E / γΐΛΐ basis to the total weight of the composition, - optionally free perfume oil. Shampoo / shower gel An object of the invention is a consumer product in the form of shampoo or shower gel comprising: - a shampoo or shower gel active base; preferably comprising at least one active material selected from the group consisting of sodium alkyl ether sulfate, ammonium alkyl ether sulfates, alkylamphoacetate, cocamidopropyl betaine, cocamide MEA, alkyl glucosides and amino acid-based surfactants and mixtures thereof, the active base being preferably used in an amount between 85 and 99.95% by weight based on the total weight of the composition, a microcapsule suspension as defined above, preferably in an amount between 0.05 and 15% by weight, more preferably between 0.1 and 5% by weight with respect to the total weight of the composition, - optionally free perfume oil. Rinse-out conditioner An object of the invention is a consumer product in the form of a rinse-off conditioner composition comprising: - an active rinse-off conditioner base; preferably comprising at least one active ingredient selected from the group consisting of cetyltrimonium chloride, stearyltrimonium chloride, benzalkonium chloride, behentrimonium chloride and mixtures thereof, the active base being preferably used in an amount between 85 and 99.95% by weight of the total weight of the composition, a microcapsule suspension as defined above, preferably in an amount between 0.05 and 15% by weight, more preferably between 0.1 and 5% by weight of the total weight of the composition, - optionally free perfume oil. Solid aroma enhancer An object of the invention is a consumer product in the form of a solid aroma enhancer composition comprising: - a solid carrier, preferably chosen from the group consisting of urea, sodium chloride, sodium sulfate, sodium acetate, zeolite, sodium carbonate, sodium bicarbonate, clay, talc, calcium carbonate, magnesium sulfate, gypsum, calcium sulfate, magnesium oxide, zinc oxide, titanium dioxide, calcium chloride, potassium chloride, magnesium chloride, zinc chloride, saccharides such as sucrose, mono-, di- and polysaccharides and derivatives such as starch, cellulose, methylcellulose, ethylcellulose, propylcellulose, sugar polyols / alcohols such as sorbitol, maltitol, xylitol, erythritol and isomalt, PEG, PVP, citric acid or any water-soluble solid acid, fatty alcohols or fatty acids and mixtures thereof, - a suspension of microcapsules as defined above, in powder form, preferably in an amount between 0.05 and 15% by weight, more preferably between 0.1 and 5% by weight based on the total weight of the composition, - optionally free perfume oil. Liquid aroma enhancer An object of the invention is a consumer product in the form of a liquid aroma enhancer composition comprising: - an aqueous phase, - a surfactant system consisting essentially of one or more nonionic surfactants, wherein the surfactant system has an average HLB between 10 and 14, preferably selected from the group consisting of ethoxylated aliphatic alcohols, POE / PPG (polyoxyethylene and polyoxypropylene) ethers, mono- and polyglyceryl esters, sucrose ester compounds, polyoxyethylene hydroxy esters, alkyl polyglucosides, amine oxides, and combinations thereof; - a linker selected from the group consisting of alcohols, salts and esters of carboxylic acids, salts and esters of hydroxycarboxylic acids, fatty acids, salts of fatty acids, fatty acids of glycerol, surfactants with an HLB less than 10 and mixtures thereof, and - a suspension of microcapsules as defined above, in suspension form, preferably in an amount between 0.05 and 15% by weight, more preferably between 0.1 and 5% by weight based on the total weight of the composition, - optionally free perfume oil. Hair coloring An object of the invention is a consumer product in the form of an oxidizing composition for hair coloring comprising: - an oxidizing phase comprising an oxidizing agent and an alkaline phase comprising an alkaline agent, a dye precursor and a coupling compound; wherein the dye precursor and the coupling compound form an oxidizing hair dye in the presence of the oxidizing agent, preferably in an amount between 85 and 99.95% by weight relative to the total weight of the composition, - a suspension of microcapsules as defined above, preferably in an amount between 0.05 and 15% by weight, more preferably between 0.1 and 5% by weight with respect to the total weight of the composition, rncn Ln / zznz / E / YiAi - optionally free perfume oil An oxidizing hair color composition is understood to be a composition comprising two groups of colorless dye molecules: the dye precursor and the coupling agent. By reacting with each other through an oxidation process, they form a wide range of colored molecules (dyes) that are then trapped in the hair due to their size. In other words, the dye precursor and the coupling compound form an oxidizing hair dye in the presence of the oxidizing agent. Dye precursor and oxidative dye precursor are used interchangeably in the present invention. Dye precursors can be aromatic compounds derived from benzene substituted by at least two electron-donating groups such as NH2 and OH in para or ortho positions to confer the property of easy oxidation. According to one modality, the dye precursors are selected from the group consisting of p-phenylenediamine, 2,5-diaminotoluene, N,N-bis(2-hydroxymethyl)-p-phenylenediamine, 4-aminophenol, 1,4-diaminobenzene, and mixtures thereof. The primary dye precursor is used in combination with coupling agents. The coupling agents are preferably aromatic compounds derived from benzene and rncn Ln / zznz / E / YiAi substituted with groups such as NH2 and OH in the meta position and do not produce color on their own, but rather modify the color, hue, or intensity of the colors developed by the dye precursor. According to one embodiment, the coupling agent is selected from the group consisting of resorcinol, 2-methylresorcinol, 4-chlorosorquinol, 2,5-diaminotoluene, 1,3-diaminobenzene, 2,4-diaminophenoxyethanol HCl, 2-aminohydroxyethylaminoanisole sulfate, 4-amino-2-hydroxytoluene, and mixtures thereof. The precursor of the oxidizing dye is preferably used in an amount between 0.001% and 5%, preferably between 0.1% and 4% by weight with respect to the total weight of the composition. The use of oxidative dye precursors and coupling agents in hair dye formulations has been extensively described in the prior art and is well known to those experienced in the technique. EP 0946133A1, the contents of which are incorporated by reference, may be cited, for example. The alkaline phase comprises an alkaline agent, preferably selected from the group consisting of ammonium hydroxide, ammonium carbonate, ethanolamine, potassium hydroxide, sodium borate, sodium carbonate, triethanolamine, and mixtures thereof. rncn Ln / zznz / E / YiAi The alkaline agent is preferably used in an amount between 1% and 10%, preferably between 3% and 9% by weight with respect to the total weight of the composition. According to the invention, the coupling agent and the dye precursor in an alkaline medium form an oxidizing hair dye in the presence of the oxidizing agent. The oxidizing agent will supply the oxygen gas needed to develop color molecules and create a change in hair color. The oxidizing agent should be safe and effective for use in the compositions of the present invention. Preferably, the oxidizing agents suitable for use in the present invention shall be soluble in the compositions according to the present invention when in liquid form and / or in the form intended for use. Preferably, the oxidizing agents suitable for use here will be water-soluble. Suitable oxidizing agents for use here are selected from inorganic peroxy oxidizing agents, preformed organic peroxyacid oxidizing agents, and organic peroxide oxidizing agents, or mixtures thereof. The oxidizing agent is preferably used in an amount between 5 and 30%, preferably between 5 and 25% by weight with respect to the total weight of the composition. Components commonly used in cosmetic compositions can be added to the hair coloring composition as defined in the present invention. Examples include surfactants, cationic polymers, oily substances, silicone derivatives, fragrances, preservatives, ultraviolet absorbers, antioxidants, germicides, propellants, and thickeners. According to a particular modality, the hair coloring composition comprises one or more quaternary ammonium compounds, preferably chosen from the group consisting of cetyltrimonium chloride, stearyltrimonium chloride, benzalkonium chloride, behentrimonium chloride and mixtures thereof to confer hair conditioning benefits. Perfume composition According to a particular modality, the consumer product is presented in the form of a perfume composition comprising: - 0.1 to 30%, preferably 0.1 to 20% of microcapsules as defined above, - 0 to 40%, preferably 3-40% perfume, and - 20-90%, preferably 40-90% ethanol, by weight with respect to the total weight of the perfume composition. rncn ίη / 77Π7 / E / γΐΛΐ The invention will now be further described by means of examples. It will be appreciated that the invention, as claimed, is not intended to be limited in any way by these examples. Examples The invention is described in more detail below by means of the following examples, in which abbreviations have their usual meanings in the art, and temperatures are given in degrees Celsius (°C). NMR spectral data were recorded on a Bruker AMX 500 spectrometer in deuterated tetrahydrofuran (THF)-d8 at 500 MHz for 1H and at 125.8 MHz for 13csi unless otherwise stated. Chemical shifts δ are given in ppm with respect to Si (0.375) as standard, and coupling constants J are expressed in Hz (br. = broad peak). Reactions were carried out in standard glassware under N2. Commercially available reagents and solvents were used without further purification unless otherwise stated. Although specific conformations or configurations are indicated for some of the compounds, this is not intended to limit the use of these compounds to the isomers described. According to the invention, all possible conformational or configurational isomers are expected to have a similar effect. Example 1 Preparation of acyl chlorides according to formula (I) (a) Synthesis of propane-1,2,3-tricarbonyl trichloride (acyl chloride 1) In a Schlenk tube, previously oven-dried at 150°C, thionyl chloride (20.0 mL, 1.64 g mL⁻¹, 276 mmol) and 2–3 drops of N,N-dimethylformamide (DMF) were added to propane-1,2,3-tricarboxylic acid (2.00 g, 11 mmol, source: TCI). The reaction mixture was heated under reflux overnight under a flow of nitrogen, which was neutralized through a wash bottle containing an aqueous solution of NaOH (10%). An aliquot of the reaction mixture (0.1 mL) was pipetted into a small vial. After evaporating the SOCl₂ and washing with argon, the sample (38 mg) was analyzed by NMR spectroscopy. The SOCl₂ from the remaining sample was evaporated, and the product was washed with argon. 3H NMR: 3.80 (quint., J = 5.9 Hz, 1 H), 3.64 (dd, J = 19.1, 6.0 Hz, 2 H), 3.56 (dd, J = 19.1, 5.8 Hz, 2 H). 13C NMR: 173.35, 172.32, 49.47, 47.08. (b) Synthesis of cyclohexane-1,2,4,5-tetracarbonyl tetrachloride (acyl chloride 2) In a Schlenk tube, previously oven-dried at 150°C, SOCl₂ (25.0 mL, 345 mmol) and 3 drops of DMF were added to cyclohexane-1,2,4,5-tetracarboxylic acid (6.64 g, 26 mmol, source: TCI). The reaction mixture was stirred at room temperature for 2 days under a flow of nitrogen, which was neutralized through a wash bottle containing an aqueous solution of NaOH (10%). An aliquot of the reaction mixture (0.05 mL) was pipetted and placed into a small vial. After evaporating the SOCl₂ and washing with argon, the sample (34 mg) was analyzed by NMR spectroscopy. The SOCl₂ from the remaining sample was evaporated, and the product was washed with argon. 3H NMR: 3.31-3.22 (m, 4 H), 2.46-2.39 (m, 2 H), 1,941.81 (m, 2 H). RMN13C: 173.43, 39.39, 21.97. (c) Synthesis of 2,2'-disulfanediyldisuccinyl dichloride (acyl chloride 3) Ferrous sulfate hydrate (FeSCg x 7 H2O, 80 mg, 0.3 mmol) was added to a stirred solution of 2-mercaptosuccinic acid (thiomalic acid, 32, 29.6 g, 197.1 mmol, source: TCI) in water (250 mL). Hydrogen peroxide (35%, 14.59 g, 150.1 mmol) was then added dropwise over 5–10 min, maintaining the temperature below 35 °C with an ice bath. After stirring at room temperature overnight, the reaction mixture was extracted with ethyl acetate (250 mL, 3x). The aqueous layer was re-extracted with ethyl acetate (250 mL), and the combined organic layers were washed with a saturated aqueous solution of rncn Ln / zznz / E / YiAi NaCl (100 mL, 2x) , were dried (Na2SO4) and concentrated (45°C, 5 mbar) to give 23.40 g of a white crystalline solid. The solid (22.38 g) was ground and dried in a desiccator (0.06 mbar) to give 22.10 g (79%) of 2,2'-disulfanidyldisuccinic acid as a mixture of diastereomers. 3H NMR (DMSO-de): 12.69 (br. s, 4 H), 3.81-3.73 (m, 2 H), 2.85 and 2.82 (dd, J = 9.6, 3.5 Hz, 2 H), 2.71 (dd, J = 17.0, 4.8 Hz, 2 H). 13C NMR (DMSO-d6): 171.45, 171.38, 171.27, 47.94, 47.35, 35.83, 35.59. In a Schlenk tube, 11.6 mL of SOCl₂ (160.0 mmol) was rapidly added to a suspension of 2,2'-disulfanyldisuccinic acid (5.96 g, 20.0 mmol) in 40 mL of dichloromethane. The reaction mixture was heated under reflux with a stream of nitrogen, which was neutralized through a wash bottle containing 10% aqueous NaOH. After 1 h, more dichloromethane (15 mL) was added, and the reaction continued under reflux overnight. The solvent and excess SOCl₂ were then removed by distillation under nitrogen through a distillation bridge. The product was dried using a membrane pump to yield the target compound. RMN3H: 4.53-4.45 (m, 1 H), 3.46 (dd, J = 10.3, 3.6 Hz, 0.5 H) y 3.42 (dd, J = 10.0, 3.6 Hz, 0.5 H), 3.14 (t, J = 6.3 rncn Ln / Yzn / Yzzz). Hz, 0.5 Η) and 3.10 (t, J = 6.3 Hz, 0.5 H) . NMR13C: 171.64, 171.54, 169.04, 169.02, 49.41, 49.13, 36.20, 35.66. (d) Synthesis of 2-(2-chloro-2-oxoethyl)sulfanylbutanodioyl dichloride (acyl chloride 4) In a Schlenk tube, previously oven-dried at 150°C, SOCl₂ (10.0 mL, 138 mmol) and 3 drops of DMF were added to 2-(carboxymethylsulfanyl)butanedioic acid (4.30 g, 20 mmol, source: Alfa Aesar). The reaction mixture was stirred at room temperature over the weekend under a flow of nitrogen, which was neutralized through a wash bottle containing an aqueous solution of NaOH (10%). An aliquot of the reaction mixture (0.1 mL) was pipetted into a small vial. After evaporating the SOCl₂ and washing with argon, the sample (38 mg) was analyzed by NMR spectroscopy. The SOCl₂ from the remaining sample was evaporated and washed with argon to obtain the target compound. 3H NMR: 4.43 (d, J = 17.3 Hz, 1H) ; 4.31-4.24 (m, 1 H), 4.21 (d, J = 17.3 Hz, 1 H), 3.44 (dd, J = 18.9, 9.9 Hz, 1 H), 2.94-2.79 (m, 1 H). 13C NMR: 171.65, 170.49, 169.21, 45.20, 40.64, 35.75. (e) Synthesis of (4-chloro-4-oxobutanoyl)-L-glutamoyl dichloride (acyl chloride 5) Sodium hydroxide (2.50 g) was rapidly added to a suspension of L-glutamic acid (8.83 g, 60 mmol) in water (100 mL), which was cooled in a water bath to maintain the temperature below 20°C. The pH was adjusted from 8.25 to 9.50 by adding an aqueous solution of NaOH (10%, 8 mL). Succinic anhydride (6.00 g, 60 mmol) was added in 1 g portions every 15 min, while maintaining the reaction temperature at approximately 20°C with a cold water bath. The pH was maintained between 9.0 and 9.5 after each addition with an aqueous solution of NaOH (10%, 10 mL were required each time, and a total of 50 mL were added). A colorless solution (pH 9.40) was obtained. The reaction mixture was left stirring at room temperature over the weekend (pH 9.13). A Dowex® Marathon resin (65 g) was washed in a Büchner filter with an aqueous solution of HCl (10%) and demineralized water until neutral.Dowex® resin was slowly added to the reaction in small portions (pH 2.76), stirred for 1 h, then filtered and rinsed with water (50 ml). The filtrate was lyophilized (for 16 h) and dried under vacuum (0.05 mbar) for 3 h to give 15.76 g (quantity) of (3-carboxypropanoyl)-L-glutamic acid. 3H NMR (DMSO-d6): 7.97 (d, J = 8.1 Hz, 1 H), 4.20-4.12 (m, 1 H), 2.47-2.29 (m, 4 H), 2.24 (t, J = 7.7 Hz), 2 H), 1.95-1.85 (m, 1 H), 1.81-1.70 (m, 1 H). 13C NMR-(DMSO-d6) : 174.02, 173.80, 173.53, 170.84, 51.53, 30.45, 29.86, 29.17, 26.96. rncn Ln / zznz / E / YiAi In a Schlenk tube, previously oven-dried at 150°C, SOCl₂ (20.0 mL, 276 mmol) and 3 drops of DMF were added to (3-carboxypropanoyl)-L-glutamic acid (6.18 g, 25 mmol). The reaction mixture was heated slowly under a stream of nitrogen, which was neutralized through a wash bottle containing an aqueous solution of NaOH (10%). After overnight heating at 60°C, an aliquot of the reaction mixture (0.2 mL) was pipetted into a small vial. After evaporation of the SOCl₂, the sample (63 mg) was analyzed by NMR spectroscopy (approximately 90% purity). The SOCl₂ from the remaining sample was evaporated, and the residue was dried under vacuum (0.26 mbar) to yield 7.12 g (94%) of the target compound. 3H NMR (CDCI3) : 4.95-4.89 (m, 1 Η), 3.27 (s, 2 Η), 3,092.93 (m, 2 Η), 2.87 (s, 2 Η), 2.64-2.52 (m, 1 Η), 2.49-2.38 (m, 1H). NMR33C (CDCI3): 175.66 (2x), 173.12, 170.22, 59.31, 43.18, 41.51, 28.15, 23.89. f) Synthesis of a mixture of (4-chloro-4-oxobutanoyl)-L-glutamoyl dichloride (acyl chloride 5) and (S)-4((1,5-dichloro-l,5-dioxopentan-2-yl)amino)-4-oxobutanoic acid (acyl chloride 6) In a Schlenk tube, previously oven-dried at 150°C, SOCl₂ (10.0 mL, 138 mmol) was added to (3-carboxypropanoyl)-L-glutamic acid (1.24 g, 5 mmol). The reaction mixture was stirred under a flow of nitrogen, which was neutralized through a wash bottle containing an aqueous solution of NaOH (10%). After heating at 70°C overnight and stirring at room temperature for 9 days, an aliquot of the reaction mixture (0.15 mL) was pipetted into a small vial. The SOCl₂ was evaporated, and the sample (48 mg) was analyzed by NMR spectroscopy. The analysis indicated the formation of a mixture of acyl chloride 6 and acyl chloride 5 in a ratio of approximately 1:1.7 (~ 40:60%). NMR3H Acyl chloride 6, CDCI3) : 4.94-4.90 (m, 1 H), 3.08-2.94 (m, 2 H), 3.01 (s, 2 H), 2.87 (s, 2 H), 2.61-2.54 (m, 1 H), 2.47-2.39 (m, 1 H). 13C NMR (6-acyl chloride, CDCI3): 175.70 (2x), 173.13, 170.22, 59.32, 43.17, 41.51, 28.14, 23.88. g) Synthesis of 2,2-bis[(4-chloro-4-oxo-butanoate of acyl chloride 7) In a three-necked round-bottom flask, 1,1,1-tris-(hydroxymethyl)propane (5.01 g, 37.31 mmol) and triethylamine (30 mL, 215.24 mmol) were dissolved in THE (250 mL) to give a colorless solution. Succinic anhydride (23.49 g, 234.75 mmol) was added, and the reaction mixture was stirred at room temperature for 15 h. The solvent was removed by distillation, and ethyl acetate was added to the crude oil. The organic layer was washed with a saturated aqueous solution of rncn Ln / zznz / E / YiAi NH4C1 (2x) , with a saturated aqueous solution of NaCl and was dried (MgSO4) . After filtration, the solvent was removed by distillation to provide a brown solid (17.7 g). NMR (acetone-dg): 4.07 (s, 6 H), 3.06 (m, 6 H), 2.62 (m, 12 H), 1.53 (q, 2 H), 0.89 (t, 3 H). 13C NMR (acetone-dg): 173.81, 172.52, 64.50, 41.70, 29.61, 29.31, 29.15, 23.58, 7.65. h) Synthesis of 4-chloro-4-oxo-butanoate of [2-[2,2bis[(4-chloro-4-oxo-butanoyl)oxymethyl]butoxymethyl]-2-[(4-chloro-4-oxo-butanoyl)oxymethyl]butyl] (acyl chloride 8) In a three-necked round-bottom flask, 2-[2,2-bis(hydroxymethyl-1)butoxymethyl-1]-2-ethyl-1-propane-1,3-diol (2.01 g, 8.04 mmol) and triethylamine (9 mL, 64.57 mmol) were dissolved in THF (100 mL) to give a colorless solution. Succinic anhydride (6.4 g, 64 mmol) was added, and the reaction mixture was stirred at room temperature for 6 h. The solvent was then removed by distillation, and the residue was diluted with ethyl acetate. The organic phase was washed with a saturated aqueous solution of NH4Cl (2x), with a saturated aqueous solution of NaCl, and dried with MgSO4. After filtration, ethyl acetate was removed by distillation to provide 4-[2-[2,2-bis(3-carboxypropanoyloxymethyl)butoxymethyl]-2(3-carboxypropanoyloxymethyl)butoxy]-4-oxo-butanoic acid as a solid. 3H NMR (acetone-de): 4.03 (s, 8 H), 3.36 (s, 4 H), 2.62 (m, 16 H), 1.48 (q, 4 H), 0.88 (t, 6 H). 13C NMR (acetone-dg): 174.01, 172.50, 71.50, 64.88, 42.53, 29.66, 29.21, 23.67, 7.78. In a three-necked round-bottom flask, 4-[2[2,2-bis(3-carboxypropanoyloxymethyl)butoxymethyl]-2-(3-carboxypropanoyloxymethyl)butoxy]-4-oxobutanoic acid (13.39 g, 20.58 mmol) was dissolved in THF (60 mL). SOCl₂ (12.01 mL, 164.64 mmol) was then added dropwise over a period of 10 min (yellow solution), and the reaction mixture was stirred at room temperature for 3 h. The solvent and excess SOCl₂ were removed by distillation, and the product was dried using a membrane pump to yield the target compound. 3H NMR (acetone-dg): 4.07 (m, 6 H), 4.04 (m, 2 H), 3.36 (m, 10 H), 2.77 (m, 6 H), 2.62 (s, 3 H), 1.49 (q, 4 H), 0.89 (t, 6 H). 13C NMR (acetone-dg): 173.82, 171.48, 71.42, 65.20, 42.60, 42.52, 29.97, 23.62, 7.73. (i) Synthesis of 2,2-bis[(2-chlorocarbonylbenzoyl)oxymethyl]butyl (acyl chloride 9) 2-chlorocarbonylbenzoate In a three-necked round-bottom flask, 1,1,1-tris-(hydroxymethyl)propane (5 g, 37.27 mmol) and triethylamine (20.78 mL, 149.06 mmol) were dissolved in THF (250 mL) to give a colorless solution. The reaction mixture was cooled to 5°C in a cold water bath. Italic anhydride (17.11 g, 115.53 mmol) was added, and the reaction mixture was stirred for 15 minutes while being heated to room temperature. The solvent was removed by distillation, and a saturated aqueous solution of NaHCCg was added. Diethyl ether was added, and the organic layer was removed. An aqueous solution of HCl (10%) was added to the aqueous phase to obtain a pH of 3. A white solid precipitated and was separated by filtration. The solid was dissolved in acetone and the solution was dried with magnesium sulfate (MgSO4) before removing the solvent by distillation to provide 21.16 g of 2-[2,2-bis[(2-carboxybenzoyl)oxymethyl]butoxycarbonyl]benzoic acid as a white solid. 3H NMR (acetone-ds): 7.81 (m, 3 H), 7.68 (m, 3 H), 7.58 (m, 6 H), 4.36 (s, 6 H), 1.62 (q, 2 H), 0.97 (t, 3H). 13C NMR (acetone-dg) : 169.79, 168.60, 134.39, 133.65, 131.63, 131.61, 129.80, 129.31, 65.69, 41.75, 23.57, 7.69. In a three-necked round-bottom flask, 2-[2,2-bis[(2-carboxybenzoyl)oxymethyl]butoxycarbonyl]benzoic acid (19.56 g, 33.82 mmol) and SOCl2 (100 ml, 1370.9 mmol) were mixed to give a yellow solution. The reaction mixture was stirred for 4 h. Then, the SOCl2 was removed by distillation and the crude product was vacuum dried overnight to produce an orange-colored oil. rncn Ln / zznz / E / YiAi 3H NMR (acetone-dg): 7.98 (m, 3 H), 7.86 (m, 3 H), 7.81 (m, 3 H), 7.74 (m, 3 H), 4.54 (s, 6 H), 1.78 (q, 2 H), 1.08 (t, 3 H). 13C NMR (acetone-dg): 168.80, 166.04, 137.75, 133.55, 133.50, 130.80, 129.87, 129.05, 66.37, 42.22, 23.78, 7.68. j) Synthesis of 2-chlorocarbonylbenzoate of [2-[2,2bis[(2-chlorocarbonylbenzoyl)oxymethyl]butoxymethyl]-2-[(2-chlorocarbonylbenzoyl)oxymethyl]butyl] (acyl chloride 10) In a three-necked round-bottom flask, 2-[2,2-bis(hydroxymethyl)butoxymethyl]-2-ethylpropane-1,3-diol (2.01 g, 8.02 mmol) and triethylamine (5.8 mL, 41.61 mmol) were dissolved in THF (75 mL). The solution was cooled to 5°C using a cold water bath. Italic anhydride (5 g, 33.75 mmol) was added, and the reaction mixture was stirred for 15 h while being heated to room temperature. The solvent was distilled, and diethyl ether was added. Deionized water was added, and the organic layer was removed. A 10% aqueous solution of HCl was added to the aqueous phase to obtain a pH of 4. A white solid precipitated, which was filtered, dissolved in acetone, and dried (MgSO4). The solvent was then removed by distillation to provide 6.3 g of 2-[2-[2,2-bis[(2-carboxybenzoyl)oxymethyl]butoxymethyl]2-[(2-carboxybenzoyl)oxymethyl]butoxy]carbonylbenzoic acid as a solid blank. 3H NMR (acetone-dg): 7.79 (m, 4 H), 7.68 (m, 4 H), 7.58 (m, 8 H), 4.31 (s, 8 H), 3.51 (s, 4 H), 1.57 (q, 4 H), 0.91 rncn ίη / ζζηζ / Ε / γίΛΐ (t, 6 Η) . 13C NMR (acetone-de): 169.46, 168.39, 133.78, 133.64, 131.84, 131.68, 129.75, 129.50, 71.64, 66.38, 42.62, 23.85, 7.90. In a three-necked round-bottom flask, 2-[2-[2,2-bis[(2-carboxybenzoyl)oxymethyl]butoxymethyl]-2-[(2-carboxybenzoyl)oxymethyl]butoxy]carbonylbenzoic acid (20.2 g, 23.52 mmol) and SOCl2 (100 ml, 1370.9 mmol) were mixed to give a yellow solution. DMF (50 mg) was added and the reaction mixture was stirred for 15 h. The SOCl2 was then removed by distillation to provide an orange oil, which was vacuum-dried overnight. Η3NMR (de-acetone): 7.94 (m, 4 H), 7.83 (m, 4 H), 7.78 (m, 4 H), 7.71 (m, 4 H), 4.42 (s, 8 H), 3.61 (s, 4 H), 1.66 (q, 4 H), 0.98 (t, 6 H) . 13C NMR (acetone-de): 133.45, 133.38, 130.77, 129.90, 128.88, 71.49, 66.68, 42.90, 23.71, 7.77. (k) Synthesis of 4(2,4,5-trichlorocarbonylbenzoyl)oxybutyl (acyl chloride 11) 2,4,5-trichlorocarbonylbenzoate In a three-necked round-bottom flask, 2,2,4,5-benzene-tetracarboxylic anhydride (4.93 g, 22.6 mmol) and triethylamine (8 mL, 57.4 mmol) were dissolved in 150 mL of THE to give an orange solution. A solution of 1,4-butanediol (1 mL, 11.28 mmol) was added dropwise to 20 mL of THE. The reaction mixture was stirred at room temperature for 4 h. The solvent was then removed by distillation to produce a solid. Acetone (25 mL) was added, and the suspension was stirred for 15 h. A saturated aqueous solution of NaHCO3 (100 mL) was added, and the reaction mixture was stirred until complete dissolution of the solid. The solution was washed with ethyl acetate (100 mL). The organic layer was removed, and the pH of the aqueous phase was adjusted to 3 with an aqueous solution of HCl (10%). A white, viscous oil phase was separated. The water was removed, and the precipitate was washed with water, dissolved in acetone, dried (MgSCg), and filtered.The solvent was removed by distillation to provide 6.2 g of 5-[4-(2,4,5-tricarboxybenzoyl)oxybutoxycarbonyl]benzene1,2,4-tricarboxylic acid in the form of a white solid. 3H NMR (acetone-de): 8.03 (s, 2 H), 7.94 (s, 2 H), 4.32 (m, 4 Η), 1.82 (m, 4 H). 13C NMR (acetone-dg): 167.14, 166.99, 166.62, 166.21, 5.23, 134.56, 134.12, 133.70, 128.90, 128.26, 65.14, 24.41. In a three-necked round-bottom flask, 5-[4(2,4,5-tricarboxybenzoyl)oxybutoxy-carbonyl]benzene-1,2,4-tricarboxylic acid (5.52 g, 9.81 mmol), SOCl2 (50 mL, 236.4 mmol), and DMF (0.05 g, 0.68 mmol) were mixed to give an orange solution. The reaction mixture was stirred at 80°C for 24 h. Then, the SOCl2 was removed by distillation to obtain an orange oil. 4H NMR (acetone-dg): 8.35-7.90 (m, 4H, mixture of isomers), 4.33 (m, 4H), 1.83 (m, 4H). rncn Ln / zznz / E / YiAi 13C NMR (acetone-dg): 167.04, 166.91, 166.52, 166.22, 5.17, 134.52, 134.22, 133.74, 128.92, 128.29, 65.23, 24.51. Example 2 Preparation of polyamide A microcapsules using an oil-phase colloidal stabilizer and acyl chlorides of formula (I) Perfume oils 1 and 2 were prepared by mixing the ingredients listed in Tables 1 and 2. Table 1: Composition of perfume oil 1. rncn ίη / 77Π7 / E / γΐΛΐ Ingredients O 2,4-Dimethyl-3-cyclohexene-lcarbaldehyde 3.30 Allyl Heptanoate 5.50 Allyl (2- and 3-methylbutoxo)acetate 10.99 DeIta-Damascone 1.65 Tricyclo[5.2.1.0-2,6-]dec-3- and 4-en-8-yl acetate 20.30 Hedione®1* 4.95 Iso E Super®2> 16.49 Hexylcinnamic aldehyde 9.89 Ethyl 2-methylpentanoate 3.30 Lilial®3' 21.98 (3Z)-3-Hexen-l-yl butyrate 1.10 Ambrox®4' 0.55 Total 100 methyl dihydrojasmonate, origin: Firmenich SA, Geneva, Switzerland2)1-(Octahydro-2,3,8,8-tetramethyl-2-naphthalenyl)-1- ethanone, origin: International Flavors & Fragrances, USA. 3)2-Methyl-3-[4 - (2-methyl-2-propanyl)phenyl]propanal, origin Givaudan SA, Geneva, Switzerland4)(-)- (8R)-8,12-Epoxy-13,14,15,16-tetranorlabdane, origin: Firmenich SA, Geneva, Switzerland Table 2: Composition of perfume oil 2. rncn Ln / zznz / E / YiAi Ingredients 0 Ethyl 2-Methylpentanoate 3.20 Eucalyptol 7.80 Decanal 0.75 2,4-Dimethyl-3-cyclohexene-lcarbaldue® 0.75 Citronellyl nitrile 4.30 Isobornyl acetate 3.00 Verdox®2' 9.80 Citronellyl acetate 1.30 2-Methyldecanal 3.00 Diphenyloxide 0.80 Dodecanal 1.30 Dicyclopentadiene acetate 9.85 Beta-Ionone 3.30 Gamma-Undecalactone 18.75 Hexyl salicylate 15.90 Benzyl salicylate 16.20 Total 100 1) Origin: Firmenich SA, Geneva, Switzerland 2) 2-tert-butyl-l-cyclohexyl acetate, origin: International Flavors & Fragrances, USA An acyl chloride of formula (I) according to the invention (20 mmol, Table 3) was dissolved in benzyl benzoate (5 g). Sodium caseinate (2 g) was dispersed in benzyl benzoate (5 g) and optionally maintained at 60°C with stirring for one hour. Both solutions were mixed, stirred at room temperature for 10 min, and then added to a perfume oil (25 g, Table 1 or Table 2) at room temperature to form an oil phase. The oil phase was mixed with a solution of L-lysine (2.5 g) in water (95 g). The reaction mixture was stirred with an Ultra Turrax® at 24,000 rpm for 5 min to produce an emulsion. Ethylenediamine (0.24 g) was dissolved in water (5 g), and this solution was added dropwise to the emulsion. The reaction mixture was stirred at 30°C for 4 h to give a white dispersion. Table 3: Compositions of polyamide A microcapsules. rncn Ln / zznz / E / YiAi Acyl Chloride Capsules (g) Al 2 (Example Ib) 1.70 A2 4 (Example Id) 2.14 A3 7 (Example Ig) 3.26 A4 8 (Example Ih) 3.58 A5 9 (Example li) 8.89 A6 10 (Example Ij) 4.32 A7 11 (Example Ik) 2.22 Example 3 Preparation of polyamide B microcapsules using an oil-phase colloidal stabilizer and a mixture of 1,3,5-benzene tricarbonyl chloride and acyl chlorides of formula (I) The polyamide B microcapsules were prepared according to the protocol used for the polyamide A microcapsules (Example 2). Acyl chlorides of formula (I) according to the invention and 1,3,5-benzenetricarbonyl chloride (with a total of 20 mmol of acid chloride functions) were dissolved in benzyl benzoate (5 g). The compositions of the acid chloride mixtures are listed in Table 4. Table 4: Compositions of polyamide B microcapsules. rncn Ln / zznz / E / YiAi Capsules 1,3,5benzene tricarbonyl chloride (g) Acyl chloride (g) B1 0.50 3 (Example 1e) 1.47 B2 0.89 3 (Example 1e) 1.04 B3 1.32 3 (Example 1e) 0.48 B4 0.44 5 (Example 1e) 1.49 B5 0.86 5 (Example 1e) 0.96 B6 1.60 5 (Example 1e) 0.51 B7 0.46 7 (Example 1g) 2.46 B8 0.87 7 (Example 1g) 1.63 B9 1.34 7 (Example 1g) 0.85 B10 0.43 8 (Example 1h) 2.70 BU 0.90 8 (Example lh) 1.79 B12 1.31 8 (Example lh) 0.93 Example 4 Storage stability of microcapsules in a fabric softening composition The storage stability of the capsules was evaluated in a fabric softener formulation. Dispersions of polyamide microcapsules (0.27 g) according to the present invention (with encapsulated perfume oil 2, Table 2) were diluted with the fabric softener composition described in Table 5 (29.73 g). The softener was stored for up to one month at 37°C. The amount of perfume that escaped from the capsules was then measured by solvent extraction and GC-FID analysis (Table 6). Table 5: Composition of fabric softener. rncn Ln / zznz / E / YiAi Product % by weight Stepantex® VL 90A 8.88 10% calcium chloride solution 0.36 Proxel® GXL 0.04 Perfume Oil 2 1.00 Water 89.72 TOTAL 100 Table 6: Oil leakage from microcapsules in fabric softener composition rncn Ln / zznz / E / YiAi 3-day leak capsules (%) B2 20 B3 10 The data in Table 6 demonstrate that the microcapsules according to the present invention show satisfactory stability in demanding application formulations, such as a fabric softener. Example 4 Liquid detergent composition The A1-A7 and B1-B12 microcapsules of the present invention are dispersed in a liquid detergent base described in Table 7 to obtain an encapsulated perfume oil concentration of 0.22%. Table 7: Composition of liquid detergent Ingredients Concentration [% by weight] Sodium C14-17 Sec Alkyl Sulfonate 7 Fatty acids, C12-18 and C18 unsaturated 21 7.5 Polyglycol fatty alcohol ether C12 / 14 with 7 mol EO 3) 17 Triethanolamine 7.5 Propylene Glycol 11 Citric Acid 6.5 Potassium Hydroxide 9.5 Protease 0.2 Amylase 0.2 Mannanase 0.2 Acrylates / Methacrylate Structuring Crosslinked Copolymer Steareth20 4> 6 ​​Deionized Water 27.4 rncn Ln / zznz / E / YiAi 1) Hostapur® SAS 60; Origin: Clariant 2) Edenor® K 12-18; Origin: Cognis 3) Genapol® LA 070; Origin: Clariant 4) Aculyn® 88; Origin: Dow Chemical Example 5 Rinse-out conditioner The A1-A7 and B1-B12 microcapsules of the present invention are dispersed in a rinse-out conditioner base described in Table 8 to obtain an encapsulated perfume oil concentration of 0.5%. rncn Ln / zznz / E / YiAi Table 8: Rinse-out conditioner composition Ingredients Concentration [% by weight] A Deionized Water 81.8 Behentrimonium Chloride 2.5 Hydroxyethylcellulose 2) 1.5 B Cetearyl Alcohol 3) 4 Glyceryl Stearate (and) PEG-100 Stearate 4) 2 Behentrimonium Methosulfate (and) Cetyl Alcohol (and) Butylene Glycol 5) 4 Stearyl Alcohol Ethoxy (20) 6) 1 C Amodimethicone (and) Trideceth-12 (and) Cetrimonium Chloride 7) 3 20% Aqueous Chlorhexidine Digluconate Solution 8) 0.2 D 10% Aqueous Citric Acid Solution to pH 3.5-4 qs TOTAL: 100 1) Genamin KDM P, Clariant 2) Tylose H10 Y G4, Shin Etsu 3) Laneta O, BASF 4) Arlacel 165-FP-MBAL-PA-(RB), Croda 5) Incroquat Behenyl TMS-50-MBAL-PA-(ΜΗ) HA4112, Croda 6) SP Brij S20 MBAL-PA(RB), Croda 7) Xiameter DC MEM-0949 Emulsion, Dow Corning 8) Alpha Aesar Example 6 Shampoo composition The A1-A7 and B1-B12 microcapsules of the present invention are weighed and mixed into a shampoo composition to add the equivalent of 0.2% perfume (Table 9). Table 9: Shampoo composition rncn Ln / zznz / E / YiAi Ingredients Concentration [% by weight] A Deionized water 44.4 Polyquaternium-10 11 or ω G1 i ce riña al 85% 2) 1 DMDM ​​Hydantoin 3) 0.2 B Sodium Laureth Sulfate 4) 28 Cocamidopropyl Betaine 5) 3.2 Disodium Cocoamphodiacetate 6> 4 Stearyl Alcohol Ethoxy (20) 6) 1 C Sodium Laureth Sulfate 4> 3 Glyceryl Laureate 7) 0.2 D Deionized water 1 Sodium Methylparaben 8) 0.1 E 10% Aqueous Sodium Chloride Solution 15 10% Aqueous Citric Acid Solution to pH 5.5-6 qs Perfume 0.5 TOTAL: 100 1) Ucare Polymer JR-400, Noveon 2) Schweizerhall 3) Glydant, Lonza 4) Texapon NSO TS, Cognis 5) Tego Betain F 50, Evonik 6) Amphotensid GB 2009, Zschimmer & Schwarz 7) Monomuls 90 L-12, Gruenau 8) Nipagina monosodica, ÑIPA Example 7 Composition of antiperspirant roll-on emulsion The A1-A7 and B1-B12 microcapsules of the present invention are weighed and mixed into an antiperspirant roll-on emulsion composition to add the equivalent of 0.2% perfume (Table 10). Table 10: Composition of rncn Ln / zznz / E / YiAi antiperspirant roll-on emulsion Ingredient Quantity (weight) (% in Steareth-211 (Part A) 3.25 Steareth-212) (Part A) 0.75 PPG-15 Stearyl Ether3) (Part A) 4 Deionized WATER (Part B) 51 50% aqueous solution Aluminum Chlorohydrate (Part C) 4) 40 Fragrance (Part D) 1 1) BRIJ 72; origin: ICI 2) BRIJ 721; origin: ICI 3) ARLAMOL E; origin: UNIQEMA-CRODA 4) LOGRON L; origin: CLARIAN Parts A and B are heated separately to 75°C; Part A is added to Part B with stirring and the mixture is homogenized for 10 minutes. The mixture is then cooled while stirring; and Part C is added slowly when the mixture reaches 45°C and Part D when the mixture reaches 35°C while stirring. The mixture is then cooled to room temperature. Example 8 Deodorant spray composition The A1-A7 and B1-B12 microcapsules of the present invention are weighed and mixed into an antiperspirant roll-on emulsion composition to add the equivalent of 0.2% perfume (Table 11). Table 11: Composition of the rncn Ln / zznz / E / YiAi deodorant spray Ingredient Amount (% by weight) Ethanol 95% 90.65 Triclosan 1' 0.26 Isopropyl Myristate 9.09 1) Irgasan® DP 300; registered trademark and origin: BASF All ingredients according to the sequence of the Table 11 mixes and dissolves. Then the aerosol cans are filled, folded, and the propellant is added (Aerosol Fill: 40% active solution, 60% Propane / Butane, 2.5 bar). Example 9 Shower gel composition The A1-A7 and B1-B12 microcapsules of the present invention are weighed and mixed in the following composition to add the equivalent of 0.2% perfume (Table 12). Table 12: Composition of the shower gel rncn Ln / zznz / E / YiAi Ingredients Quantity (% by weight) Function Deionized Water 49.350 Solvent Tetrasodium EDTA 0.050 Chelating Agent Acrylates Copolymer 6.000 Thickener Pareth Sodium Sulfate C12-C15 35.000 Surfactant 20% Aqueous Sodium Hydroxide Solution 1.000 pH Adjuster Cocamidopropyl Betaine 8.000 Surfactant Methylchloroisothiazolinone and Methylisothiazolinone 0.100 Preservative Citric Acid (40%) 0.500 pH Adjuster 100 1) EDETA B POWDER; registered trademark and origin: BASF 2) CARBOPOL AQUA SF-1 POLYMER; registered trademark and origin: NOVEON 3) ZETESOL AO 328 U; registered trademark and origin: ZSCHIMMER & SCHWARZ 4) TEGO-BETAIN F 50; registered trademark and origin: GOLDSCHMIDT 5) KATHON GC; registered trademark and origin: ROHM & HASS It is hereby stated that, as of this date, the best method known to the applicant for putting the aforementioned invention into practice is the one that is clear from the present description of the invention.

Claims

1. A polyamide core-shell microcapsule, characterized in that it comprises: - an oil-based core comprising a hydrophobic material, preferably a perfume, and - a polyamide shell comprising: * at least one acyl chloride, • at least one amino compound, wherein the acyl chloride has the following formula (I) (I) wherein n is an integer ranging from 1 to 8, preferably from 1 to 6, more preferably from 1 to 4, and wherein X is a C3 to C4(n+1)-valent alkyl group, or a C2 to C4(n+1)-valent hydrocarbon group comprising at least one group selected from (i) to (vi), 102 wherein R is a hydrogen atom or a methyl or ethyl group, preferably a hydrogen atom, provided that cyclohexane-1,3,5-tricarbonyl trichloride and chloride are excluded 2,2'-oxydiacetyl.

2. The microcapsule according to claim 1, characterized in that the acyl chloride is selected from the group consisting of propane-1,2,3-tricarbonyl trichloride, cyclohexane-1,2,4,5-tetracarbonyl tetrachloride, 2,2'-disulfanidiyldisuccinyl dichloride, 2-(2-chloro-2-oxo-ethyl)sulfanylbutanedioyl dichloride, (4-chloro-4-oxobutanoyl)-L-glutamoyl dichloride, (S)4-((1,5-dichloro-1,5-dioxopentan-2-yl)amino)-4-oxobutanoic acid, 2,2-bis[(4-chloro-4-oxo-butanoyl)oxymethyl]butyl 4-chloro-4-oxobutanoate, 4-chloro-4-oxobutanoate of [2-[2,2bis[(4-chloro-4-oxo-butanoyl)oxymethyl]butoxymethyl]-2-[(4-chloro-4-oxo-butanoyl)oxymethyl]butyl], 2,2-bis[(2-chlorocarbonylbenzoyl)oxymethyl]butyl 2-chlorocarbonylbenzoate, [2-[2,2-bis[(2-chlorocarbonylbenzoyl)oxymethyl]butoxymethyl]-2-[(2-chlorocarbonylbenzoyl)oxymethyl]butyl 2-chlorocarbonylbenzoate], 4-(2,4,5-trichlorocarbonylbenzoyl)oxybutyl 2,4,5-trichlorocarbonylbenzoate and mixtures thereof.

3. The microcapsule according to claim 1 or 2, characterized in that the amino compound is selected from the group consisting of guanidine carbonate, chitosan, 3-aminopropyltriethoxysilane, xylylenediamine, 1,2-diaminocyclohexane, 1,4-diaminocyclohexane, L-lysine, L-lysine ethyl ester, polyetheramines, ethylenediamine, diethylenetriamine, spermine, spermidine, polyamidoamine (PAMAM), guanidine carbonate, chitosan, tris-(2-aminoethyl)amine, 3-aminopropyltriethoxysilane, L-arginine, an amine with a disulfide bond such as cystamine, cystamine hydrochloride, cystine, cystine hydrochloride, cystine dialkyl ester, dialkyl hydrochloride cystine ester and mixtures thereof.

4. The microcapsule according to any of the preceding claims, characterized in that the coating comprises a first amino compound and a second amino compound.

5. The microcapsule according to claim 4, characterized in that the first amino compound is selected from the group consisting of L-Lysine, L-Lysine ethyl ester, guanidine carbonate, chitosan, 3-aminopropyltriethoxysilane, and mixtures thereof.

6. The microcapsule according to claim 4, characterized in that the second amino compound is selected from the group consisting of xylylenediamine, 1,2-diaminocyclohexane, 1,4-diaminocyclohexane, L-lysine, L-lysine ethyl ester, polyetheramines (Jeffamine®), ethylenediamine, diethylenetriamine, spermine, spermidine, polyamidoamine (PAMAM), guanidine carbonate, chitosan, tris-(2-aminoethyl)amine, 3-aminopropyltriethoxysilane, L-arginine, an amine having a disulfide bond such as cystamine, cystamine hydrochloride, cystine, cystine hydrochloride, cystine dialkyl ester, dialkyl ester hydrochloride of cystine and mixtures thereof.

7. The microcapsule according to any of the preceding claims, characterized in that the weight ratio between the acyl chloride and the hydrophobic material is between 0.01 and 0.

2.

8. The microcapsule according to any of the preceding claims, characterized in that the molar ratio between the NH2 functional group of the amino compound and the COCI functional group of the acyl chloride is between 0.01 and 50.

9. The microcapsule according to any of the preceding claims, characterized in that the microcapsule comprises a cationic outer coating.

10. A process for preparing a suspension of core-shell polyamide microcapsules, characterized in that it comprises the following steps: a) Dissolving at least one acyl chloride in a hydrophobic material, preferably a perfume, to form an oily phase; b) Dispersing the oily phase obtained in step a) in an aqueous phase to obtain an oil-in-water emulsion; c) Performing a curing step to form polyamide microcapsules in suspension form;wherein a stabilizer is added to the oil phase and / or the aqueous phase, and wherein at least one amino compound is added to the aqueous phase before the formation of the oil-in-water emulsion and / or in the oil-in-water emulsion obtained after step b) wherein the acyl chloride has the following formula (I) or zox V- XH ) (1) cr \ oi L where n is an integer ranging from 1 to 8, preferably from 1 to 6, more preferably from 1 to 4, and wherein X is a C3 to Cg (n+1)-valent alkyl group, or a C2 to C45 (n+1)-valent hydrocarbon group comprising rncn Ln / zznz / E / YiAi A. ,Ή (¡) wherein R less a group selected from (i) to (vi), R (ii) (iii) (iv) (V) (vi) is a hydrogen atom or a methyl or ethyl group, preferably a hydrogen atom, 106 on the condition that cyclohexane-1,3,5-tricarbonyl trichloride and 2,2'-oxydiacetyl chloride are excluded.; 11. The process according to claim 10, characterized in that a first amino compound is added to the aqueous phase and wherein a second amino compound is added to the oil-in-water emulsion.

12. The process according to any of claims 10 or 11, characterized in that the stabilizer is selected from the group consisting of gum arabic, modified starch, polyvinyl alcohol, polyvinylpyrrolidone (PVP), carboxymethylcellulose (CMC), anionic polysaccharides, acrylamide copolymer, inorganic particles, protein such as soy protein, rice protein, whey protein, white egg albumin, sodium caseinate, gelatin, bovine serum albumin, hydrolyzed soy protein, hydrolyzed sericin, pseudocollagen, silk protein, sericin powder, and mixtures thereof.

13. A perfume composition, characterized in that it comprises (i) a perfume microcapsule according to claims 1-9, wherein the hydrophobic material comprises a perfume, (ii) at least one ingredient selected from the group that consists of a perfume carrier and a perfume base, (iii) optionally at least one perfume adjuvant.

14. A consumer product, characterized in that it comprises: - an active personal care base, and - microcapsules according to claims 1-9 or the perfume composition according to claim 13, wherein the consumer product is in the form of a personal care composition.

15. A consumer product, characterized in that it comprises: - an active base for home care or fabric care, and - microcapsules according to claims 1-9 or the perfume composition according to claim 13, wherein the consumer product is in the form of a composition for home care or fabric care.