阅读说明：本技术 包含微胶囊的染发组合物 (Hair dyeing composition comprising microcapsules ) 是由 G·维尔霍夫尼克 A·斯特鲁伊劳 J·考夫 于 2019-01-24 设计创作，主要内容包括：本发明涉及染发组合物领域。更具体地,本发明涉及一种氧化染发组合物,其包含由香料油基核和聚合物壳制成的微胶囊。用于染发的方法和染发套件也是本发明的目的。(The present invention relates to the field of hair coloring compositions. More particularly, the present invention relates to an oxidative hair coloring composition comprising microcapsules made of a fragrance oil-based core and a polymeric shell. A method for coloring hair and a hair coloring kit are also objects of the present invention.)

1. An oxidative hair coloring composition comprising:

(i) an oxidizing phase comprising an oxidizing agent;

(ii) a basic phase comprising a basic agent, a dye precursor and a coupling compound; and

(iii) core-shell microcapsules having a polymeric shell and a core comprising a perfume oil, the microcapsules having an average size equal to or greater than 25 μm.

2. The hair dyeing composition according to claim 1, characterized in that the average size of the core-shell microcapsules is from 100 to 500 μm.

3. Hair dyeing composition according to claim 1 or 2, characterized in that the core shell microcapsules are added in an amount of 0.1 to 10 wt. -%, preferably 0.2 to 5 wt. -%, based on the total weight of the composition.

4. The hair dyeing composition according to any of the preceding claims, characterized in that the polymeric shell of the core-shell microcapsules is made from a material selected from the group consisting of polyurea, polyurethane, polyamide, polyacrylate, polysiloxane, polycarbonate, polysulfonamide, urea formaldehyde, melamine formaldehyde resin crosslinked with polyisocyanate or aromatic polyol, melamine urea resin, melamine glyoxal resin, gelatin/gum arabic shell wall and mixtures thereof.

5. A hair dyeing composition according to any of the preceding claims wherein the microcapsules have a cationic coating.

6. A hair dyeing composition according to any of the preceding claims wherein the oil-based core comprises:

-25 to 100 wt% of a perfume oil comprising at least 15 wt% of a high impact perfume raw material having L og T < -4, and

-0 to 75% by weight of a density balancing material having a density of more than 1.07g/cm³。

7. The hair dyeing composition according to any of the preceding claims, characterized in that the dye precursor is selected from the group consisting of p-phenylenediamine, 2, 5-diaminotoluene, N-bis (2-hydroxymethyl) -p-phenylenediamine, 4-aminophenol, 1, 4-diaminobenzene and mixtures thereof.

8. The hair dyeing composition according to any of the preceding claims, characterized in that the coupling agent is selected from the group consisting of resorcinol, 2-methylresorcinol, 4-chlororesorcinol, 2, 5-diaminotoluene, 1, 3-diaminobenzene, 2, 4-diaminophenoxyethanol hydrochloride, 2-amino-hydroxyethylaminoanisole sulfate, 4-amino-2-hydroxytoluene and mixtures thereof.

9. Hair dyeing composition according to any of the preceding claims, characterized in that the oxidizing agent is hydrogen peroxide.

10. The hair dyeing composition according to any of the preceding claims, characterized in that the alkaline agent is selected from the group consisting of ammonia hydroxide, ethanolamine and mixtures thereof.

11. Hair dyeing composition according to any one of the preceding claims, characterized in that it also comprises one or more quaternary ammonium compounds, preferably chosen from the group consisting of cetyltrimethylammonium chloride, octadecyltrimethylammonium chloride, benzalkonium chloride, behenyltrimethylammonium chloride and mixtures thereof.

12. A hair coloring kit comprising:

(i) a first vessel containing an oxidizing agent; and

(ii) a second container comprising an alkaline agent, a precursor dye, and a coupling compound;

characterized in that said first and/or second container further comprises core-shell microcapsules having a polymeric shell and a core comprising an encapsulated perfume oil, said microcapsules having an average size equal to or greater than 25 μm.

13. A method of coloring hair comprising the steps of:

a) applying a hair coloring composition as defined in claims 1 to 11 to the hair,

b) the hair is allowed to stand, and

c) washing hair with shampoo.

Technical Field

The present invention relates to the field of hair coloring compositions. More particularly, the present invention relates to an oxidative hair coloring composition comprising microcapsules made of a fragrance oil-based core and a polymeric shell. A method for coloring hair and a hair coloring kit are also objects of the present invention.

Background

Delivery systems comprising perfumes (perfumes) to release fragrance in a controlled manner are commonly used in the perfume industry and are described in the art.

The growing consumer demand for intense and intense perfume release during and after use (i.e. good olfactory properties) is driving the development of new delivery systems.

In addition, these systems must be able to survive in challenging substrates without physical decomposition or degradation. In terms of stability of the delivery system, this is referred to as performance.

Depending on the consumer product, the consumer base is more or less attacked.

Among the consumer products comprising very aggressive media, mention may be made, for example, of hair coloring systems.

Indeed, hair coloring systems fall into two broad categories, oxidative and non-oxidative, and are also based on the persistence of color (temporary or permanent) after use.

Permanent hair dyes (also called oxidative hair dyes) are commonly used because they have a higher dyeing effect and are resistant to washing.

They are usually sold in the form of a two-component kit. One component comprises a dye precursor and a coupling agent in an alkaline binder, while the other component is a stable solution of hydrogen peroxide. The two components are mixed immediately before use.

Most permanent systems include ammonium hydroxide in the alkaline base. However, when the two phases are mixed, some ammonia is released, which gives the user an unpleasant feeling when mixing and leaves an unpleasant smell on the hair during use, even after rinsing when it is applied to the hair. Therefore, fragrances are often added to hair coloring compositions in an attempt to mask this ammonia odor.

When fragrances are present in the form of free oils, the main challenge is enhanced perfume performance and a long lasting smell sensation during and after use, for example after rinsing and drying the hair. Furthermore, hair coloring compositions contain high levels of aggressive components, which is very challenging with respect to perfume stability, thus greatly limiting the palette of raw materials that can be used by a perfume manufacturer.

Accordingly, there is a need to provide an oxidative hair coloring composition which not only releases fragrance on the hair after its application (e.g. after rinsing and drying the hair), but also during the application, which fragrance is stable in the hair coloring composition.

The present invention proposes a solution to the above problems based on a hair dye composition comprising a perfume encapsulated in core-shell microcapsules, the size of the core-shell microcapsules being larger than 25 μm. Encapsulation will protect the perfume from degradation by aggressive ingredients of the base outside the microcapsules. Furthermore, the proper size of the microcapsules helps to release the perfume upon application.

Disclosure of Invention

A first object of the present invention is an oxidative hair coloring composition comprising:

(i) an oxidizing phase comprising an oxidizing agent;

(ii) a basic phase comprising a basic agent, a dye precursor and a coupling compound; and

(iii) core-shell microcapsules having a polymeric shell and a core comprising a perfume oil, the microcapsules having an average size equal to or greater than 25 μm.

A second object of the present invention is a hair coloring kit comprising:

(i) a first vessel containing an oxidizing agent; and

(ii) a second container comprising an alkalizing agent, a precursor dye and a coupling compound;

characterised in that the first and/or second container further comprises core-shell microcapsules having a polymeric shell and a core comprising encapsulated perfume oil, the microcapsules having an average size equal to or greater than 25 μm.

A third object of the invention is a method of coloring hair comprising the steps of:

a) applying to the hair a hair coloring composition as defined above,

b) the hair is allowed to stand, and

c) the hair was washed with shampoo.

Detailed Description

Unless otherwise indicated, percentages (%) refer to weight percentages of the composition.

According to the present invention, "encapsulated oil" refers to oil encapsulated in core-shell microcapsules.

In the present invention, "core-shell microcapsules" or the like means that the capsules have a particle size distribution in the micrometer range (e.g. average diameter (d (v,0.5)) of equal to or greater than 25 μm, preferably equal to or greater than 30 μm, preferably equal to or greater than 70 μm, preferably equal to or greater than 100 μm, even more preferably equal to or greater than 150 μm) and comprise an outer polymer and an inner continuous oil phase surrounded by an outer shell. According to one embodiment, the average size of the microcapsules is between 25 and 2000. mu.m, preferably between 100 and 500. mu.m, more preferably between 150 and 500. mu.m.

According to the invention, the "average diameter" or "average size" is used indiscriminately.

The average size was measured by a laser diffraction particle size analyzer.

The inventors have surprisingly found that perfume release is particularly advantageous for microcapsules having an average size equal to or greater than 25 μm, preferably equal to or greater than 100 μm, because when the user applies the hair coloring composition to the hair and foams, a transient burst (or burst) of perfume release can be obtained from the encapsulated oil by mechanical action. In addition, the user can feel a lasting effect after application.

Accordingly, a first object of the present invention is an oxidative hair coloring composition comprising:

(i) an oxidizing phase comprising an oxidizing agent;

(ii) a basic phase comprising a basic agent, a dye precursor and a coupling compound;

characterized in that the coloring composition comprises core-shell microcapsules having a polymeric shell and a core comprising a perfume oil, said microcapsules having an average size equal to or greater than 25 μm.

It is understood that according to the present invention, the dye precursor and the coupling compound form an oxidative hair dye in the presence of an oxidizing agent.

The hair coloring composition comprises microcapsules in an oxidizing phase and/or an alkaline phase.

One of the essential features of the invention is the presence of microcapsules having a size equal to or greater than 25 μm.

The microcapsules of the invention show good properties in terms of their burst and persistence of action, which translates into good odor performance. In this regard, it must be noted that while it is desirable that the microcapsules exhibit optimal performance in bursts, combined with optimal performance on dry hair, depending on the application and capsules with slightly inferior burst performance, different situations may be very interesting and having a higher persistence performance may be very useful, and vice versa. The capsules of the present invention have a profile burst/persistence performance that varies depending on the size of the microcapsules. The skilled person will be able to select the optimum balance according to the application needs.

As non-limiting examples, microcapsules with an average size of 25 to 70 μm proved to be optimal for long-lasting efficacy, and microcapsules with an average size of more than 100 μm, preferably 100 to 500 μm proved to be optimal for burst.

Core-shell microcapsules

Oil-based core

According to the invention, the oil-based core comprises a perfume.

According to a particular embodiment, the oil-based core comprises a mixture of a fragrance with another ingredient selected from the group consisting of nutraceuticals, cosmetics, insect control agents and biocide actives.

According to a particular embodiment, the oil-based core consists of a perfume.

By "perfume oil" (or also "perfume") is meant herein an ingredient or composition that is liquid at about 20 ℃. According to any one of the above embodiments, the perfume oil can be a mixture of ingredients, either alone or in a perfuming composition. By "perfuming ingredient" is meant herein a compound, the main purpose of which is to impart or modify an odor. In other words, such an ingredient to be considered as perfuming one must be recognized by a person skilled in the art as being capable of imparting or modifying in at least an active or pleasant way the odor of a composition, and not just as having an odor. For the purposes of the present invention, perfume oils also include combinations of perfuming ingredients with substances that together improve, enhance or modify the delivery of the perfuming ingredients, such as pro-perfumes, emulsions or dispersions, as well as combinations that confer benefits other than modifying or imparting odor, such as longevity, eruption, malodor counteraction, antibacterial effect, microbial stability, insect control.

The nature and type of the perfuming ingredients present in the oil phase do not warrant a more detailed description here, which in any case would not be exhaustive, the skilled person being able to select them on the basis of his general knowledge and according to the intended use or application and the desired organoleptic effect. In general, these perfuming ingredients belong to different chemical classes as varied as alcohols, aldehydes, ketones, esters, ethers, acetates, nitriles, terpenoids, nitrogenous or sulphurous heterocyclic compounds and essential oils, and the perfuming co-ingredients can be of natural or synthetic origin. In any case, many of these co-ingredients are listed in references such as the works per and Flavor Chemicals of s.arctander, 1969, Montclair, New Jersey, USA or newer versions thereof or other works of similar nature, as well as in the patent literature abundant in the Perfume field. It will also be appreciated that said ingredients can also be compounds known to release in a controlled manner various types of perfuming compounds.

The perfuming ingredients can be dissolved in solvents currently used in the perfumery industry. The solvent is preferably not an alcohol. Examples of such solvents are diethyl phthalate, isopropyl myristate,(rosin resins, available from Eastman), benzyl benzoate, ethyl citrate, limonene or other terpenes or isoparaffins. Preferably, the solvent is very hydrophobic and highly sterically hindered, e.g.Or benzyl benzoate. Preferably, the solvent is very hydrophobic and is sterically hindered, e.g.Or benzyl benzoate.

According to one embodiment, the oil-based core comprises:

-25 to 100 wt% of a perfume oil comprising at least 15 wt% of a high impact perfume raw material having L og T < -4, and

-0 to 75% by weight of a density balancing material having a density of more than 1.07g/cm³。

The method includes measuring a volume of Fragrance oil component injected by a syringe, determining a concentration of the Fragrance oil component, determining a Fragrance oil component, measuring a Fragrance oil measuring a Fragrance.

High impact perfume raw materials with L og T < -4 and with more than 1.07g/cm are described in WO2018115250³The density of (a) balances the properties of the material, the contents of which are incorporated by reference.

According to one embodiment, L og T < -4 high impact perfume raw materials are selected from the list in Table 1 below.

TABLE 1 high impact perfume raw materials of L og T < -4

According to one embodiment, the flavor material of L og T < -4 > is selected from the group consisting of aldehydes, ketones, alcohols, phenols, esters, lactones, ethers, epoxides, nitriles, and mixtures thereof.

According to one embodiment, the perfume raw material of L og T < -4 comprises at least one compound selected from the group consisting of alcohols, phenols, esters, lactones, ethers, epoxides, nitriles and mixtures thereof, preferably in an amount of 20 to 70% by weight, based on the total weight of the perfume raw material of L og T < -4 >.

According to one embodiment, the L ogT < -4 perfume raw material comprises 20 to 70 wt.% of aldehydes, ketones and mixtures thereof based on the total weight of L og T < -4 perfume raw material.

Thus, L og T > -4 of the remaining perfume raw material contained in the oil-based core.

L og T > -4 are listed in Table B below.

Table B fragrance raw materials of L og T > -4

According to one embodiment, the oil-based core comprises 2 to 75% by weight of a density balancing material having a density of more than 1.07g/cm³。

The density of a component is defined as the ratio of its mass to its volume (g/cm)³)。

There are several methods available for determining the density of a component.

The d20 density of the essential oil can be measured, for example, with reference to the ISO 298:1998 method.

According to one embodiment, the density balancing material is selected from the group consisting of benzyl salicylate, benzyl benzoate, cyclohexyl salicylate, phenyl phenylacetate, phenylethyl phenoxyacetate, glyceryl triacetate, methyl and ethyl salicylates, benzyl cinnamate, and mixtures thereof.

According to a particular embodiment, the density balancing material is selected from the group consisting of benzyl salicylate, benzyl benzoate, cyclohexyl salicylate, and mixtures thereof.

According to another embodiment, the perfume comprises at least one perfume raw material selected from the group consisting of aldehydes, ketones and mixtures thereof, preferably in an amount of 20 to 70 wt% based on the total weight of the perfume oil.

As non-limiting examples of aldehydes which can be used according to the invention, mention may be made of aldehyde C6, aldehyde C7, aldehyde C8, aldehyde C9, aldehyde C10, aldehyde C11, aldehyde C12, undecenal, methyloctylacetaldehyde (aldehyde methylvinylcetaque), aldehyde mna, aldehyde supra, tridecenal (aldehyde tricyclodecenylique), nonenal (aldehyde nonylenique), cis-nonenal, citral, citronellal, costal (9-decenal), decenal, dimethylheptenal, dodecenal, dodecylaldehyde (dodecisal), heptenal, oxalal (herbaldehyde), hexenal,Cucumis melo aldehyde (2, 6-dimethylhept-5-enal), nonadienal, nonanal, pelargonium dienal, (Z) -4-dodecenal (tanderinal) ((4Z) -4-dodecenal), trans-decenal, undecenal, nonadienal, pelargonium dienal, pelargonium,(3, 7-dimethyloctanal), acropal (4- (4-methyl-3-pentenyl) -3-cyclohexene-1-carbaldehyde), cyclovertal (3, 6-dimethyl-3-cyclohexenyl-1-carbaldehyde),(2,6, 10-trimethylundec-9-enal), isocyclocitral, isofreshal (isofreshal) ((5 or 6) -methyl- (7 or 8) - (1-methylethyl) bicyclo [2.2.2]Octyl-5-ene-2-carbaldehyde),Nonanal, octanal, trans-2 hexenal, trimenal (2,5, 9-trimethyl-4, 9-decadienal), tristal (3, 5-dimethyl-3-cyclohexene-1-carbaldehyde), ligustral (zestower) (2, 4-dimethyl-3-cyclohexene-1-carbaldehyde), amyl cinnamaldehyde, benzaldehyde, cinnamaldehyde, hexyl cinnamaldehyde, phenylpropionaldehyde, benzaldehyde, cyclosol, cyaninal (florydral), mimosol (mimosol),(+ -) -3-phenylbutanal, hydrargyrazone, Paracetal (pivonal),neo (neoqing winteraldehyde), boraginaldehyde (borageonal), lilial (lilial),Vanillyl isobutyrate (isobutavan), anisaldehyde, foliaver (3- (4-methoxy-1-phenyl) -2-methylpropionaldehyde), humusal, ethyl vanillin, heliotropin (heliotroponal), heliotropin (heliotropane), penoloacetaldehyde (pinoacetaldehyde), mysoral (maisol sandalwood), saffron aldehyde (safranal),Straw aldehyde (herbaldehydee),Lilial aldehyde 50(2- (3, 7-dimethyloct-6-enyloxy) acetaldehyde), methyl citral B (precyclemone B), and mixtures thereof.

As non-limiting examples of ketones which may be used according to the invention, mention may be made of methylheptylacetone, ethylpentyl (amyl) acetone, ethylvinylketone, homoaralkene (koavone), methylheptenone, methylhexylacetone, methylpentylacetone, mulantone, -damascenone, α -damascenone, damascenone,total (methyl ionone),α, Iso E super (1- (octahydro-2, 3,8, 8-tetramethyl-2-naphthyl) -1-ethanone), Violet BC ((3E) -4- (2,6, 6-trimethyl-1-cyclohexen-1-yl) -3-buten-2-one), Violet AT and mixtures thereof.

According to another embodiment, the perfume oil comprises an elevating (evaporating) raw material as defined in WO2012/084916, the content of which is included by reference.

In particular, examples of PRMs identified as elevated PRMs include isopropyl methyl butyrate, saffron aldehyde, citronellol, linalool, butyl acetate, α -bisabolol, carvone, and combinations thereof,(cyclopentadecanolide, source: FirmenichhSA from Geneva, Switzerland),(Yl 1, 4-Cyclohexanedicarboxylic acid)Diethyl ester, source: firmenich SA of Geneva, Switzerland),((3aRS,6SR,7aSR) -perhydro-3, 6-dimethyl-benzo [ B)]Furan-2-one derived from Firmenich SA of Geneva, Switzerland, methyl benzoate, dihydroestragole, allyl heptanoate, and hydroxycitronellal, wherein isopropyl butyrate, saffron aldehyde, citronellol, butyl acetate, α -bisabolol, carvone, and carvone,(Cyclopentadecanolide, source: Firmenich SA from Geneva, Switzerland),(diethyl 1, 4-cyclohexanedicarboxylate, from Firmenich SA, Geneva, Switzerland),((3aRS,6SR,7aSR) -perhydro-3, 6-dimethyl-benzo [ B)]Furan-2-one, source: firmenich SA from geneva, switzerland), methyl benzoate and allyl heptanoate are most preferred. According to one embodiment, the perfume comprises at least 10 wt% elevated PRM relative to the total weight of the perfume. According to one embodiment, the perfume comprises at least 20 wt% elevated PRM relative to the total weight of the perfume. According to one embodiment, the perfume comprises at least 30 wt% elevated PRM relative to the total weight of the perfume. According to one embodiment, the perfume comprises at least 40 wt% elevated PRM relative to the total weight of the perfume. According to one embodiment, the perfume comprises at least 50 wt% elevated PRM relative to the total weight of the perfume. According to one embodiment, the perfume comprises at least 60 wt% elevated PRM relative to the total weight of the perfume. According to one embodiment, the perfume comprises at least 70 wt% elevated PRM relative to the total weight of the perfume. According to one embodiment, the perfume comprises at least 80 wt% elevated PRM relative to the total weight of the perfume. According to one embodiment, the perfume comprises, relative to the total weight of the perfume, up to90 wt% less elevated PRM. According to another embodiment, it consists entirely of elevated PRMs.

Polymer shell

The nature of the polymeric shell of the microcapsules of the present invention may vary. By way of non-limiting example, the shell may be made from a material selected from the group consisting of polyureas, polyurethanes, polyamides, polyacrylates, polysiloxanes, polycarbonates, polysulfonamides, urea formaldehyde, melamine formaldehyde resins crosslinked with polyisocyanates or aromatic polyols, melamine urea formaldehyde resins, melamine glyoxal resins, gelatin/gum arabic shell walls, and mixtures thereof.

According to one embodiment, the shell of the microcapsule is based on a melamine formaldehyde resin, or a melamine formaldehyde resin crosslinked with at least one polyisocyanate or aromatic polyol.

The shell may also be composite, i.e. organic-inorganic, such as a composite shell consisting of at least two crosslinked inorganic particles, or a shell resulting from hydrolysis and condensation reactions of a polyalkoxysilane macromonomer composition.

According to one embodiment, the shell comprises an aminoplast copolymer, such as melamine-formaldehyde or urea-formaldehyde or cross-linked melamine formaldehyde or melamine glyoxal.

According to a particular embodiment, the core-shell microcapsules are cross-linked melamine formaldehyde microcapsules obtainable by a process comprising the steps of:

1) mixing a perfume oil with at least one polyisocyanate having at least two isocyanate functional groups to form an oil phase;

2) dispersing or dissolving an aminoplast resin and optionally a stabilizer in water to form an aqueous phase;

3) adding the oil phase into the water phase to form an oil-in-water dispersion, wherein the average droplet size is 1-100 μm by mixing the oil phase and the water phase;

4) performing a curing step to form the wall of the microcapsule; and

5) optionally drying the final dispersion to obtain dried core-shell microcapsules;

this method is described in more detail in WO2013/092375 and WO2015/110568, the contents of which are incorporated herein by reference.

According to another embodiment, the shell is a polyurea-based shell made from, for example, but not limited to, isocyanate-based monomers and an amine-containing crosslinking agent such as guanidine carbonate and/or guanazole. Preferred polyurea-based microcapsules comprise: a polyurea wall that is the polymerization reaction product between at least one polyisocyanate comprising at least two isocyanate functional groups and at least one reactant selected from the group consisting of amines (e.g., water-soluble guanidinium salts and guanidinium); a colloidal stabilizer or emulsifier; and encapsulated perfume. However, the use of amines may be omitted.

According to another embodiment, the shell is polyurethane-based, made from, for example, but not limited to, polyisocyanates and polyols, polyamides, polyesters, and the like.

According to a particular embodiment, the colloidal stabilizer comprises from 0.1% to 0.4% of polyvinyl alcohol, from 0.6% to 1% of an aqueous solution of a cationic copolymer of vinylpyrrolidone and quaternized vinylimidazole (all percentages being defined by weight relative to the total weight of the colloidal stabilizer). According to another embodiment, the emulsifier is an anionic or amphiphilic biopolymer, preferably selected from the group consisting of gum arabic, carboxymethylcellulose, soy protein, sodium caseinate, gelatin, bovine serum albumin, sugar beet pectin, hydrolyzed soy protein, hydrolyzed sericin, pseudocollagen, biopolymer SA-N, Pentacare-NA PF, polyvinyl alcohol, modified starch, modified cellulose, polysaccharides and mixtures thereof.

According to a particular embodiment, the polyisocyanate is an aromatic polyisocyanate, preferably comprising phenyl, toluyl, xylyl, naphthyl or diphenyl moieties. Preferred aromatic polyisocyanates are biurets and polyisocyanurates, more preferably the polyisocyanurate of toluene diisocyanate (available from Bayer under the trade nameRC purchased), trimethylolpropane addition of toluene diisocyanateCompound (available from Bayer under the trade name3575 available from Mitsui Chemicals), trimethylolpropane adduct of xylylene diisocyanate (available under the trade name Mitsui Chemicals)D-110N available).

According to one embodiment, the polyisocyanate is a trimethylolpropane adduct of xylylene diisocyanate (available under the trade name Mitsui Chemicals)D-110N available).

The preparation of aqueous dispersions/slurries of core-shell microcapsules is well known to those skilled in the art in one form, the microcapsule wall materials may comprise any suitable resin and include, inter alia, melamine, glyoxal, polyurea, polyurethane, polyamide, polyester, and the like suitable resins include reaction products of aldehydes with amines, suitable aldehydes include formaldehyde and glyoxal suitable amines include melamine, urea, benzoguanamine, glycoluril, and mixtures thereof suitable melamines include methylolmelamine, methylated methylolmelamine, iminomelamine, and mixtures thereof suitable ureas include dimethylol urea, methylated dimethylol urea, urea-resorcinol, and mixtures thereof suitable materials of manufacture are available from one or more of Solutia Inc. (St L ouis, Missouri U.S.A.), Cytec Industries (West Patersey U.S.A.), Sigma-rich (St. L, Missori U.S.A.).

According to a particular embodiment, the core-shell microcapsules are formaldehyde-free capsules. A typical process for preparing aminoplast formaldehyde-free microcapsule slurries comprises the steps of:

1) preparing an oligomeric composition comprising the reaction product of, or obtained by reacting together:

a) in the form of melamine orMelamine with at least one catalyst comprising two NH groups₂C of functional group₁-C₄A polyamine component in the form of a mixture of compounds;

b) glyoxal, C_4-6Aldehyde component in the form of a mixture of a 2, 2-dialkoxyacetal and optionally a glyoxylate, glyoxal/C of said mixture_4-6The molar ratio of the 2, 2-dialkoxy ethanol is 1/1-10/1; and

c) a protic acid catalyst;

2) preparing an oil-in-water dispersion, wherein the droplet size is 25 to 1000 μm, and comprising:

i. an oil;

aqueous medium

At least one oligomeric composition as obtained in step 1;

at least one cross-linking agent selected from the group consisting of:

A)C₄-C₁₂aromatic or aliphatic di-or triisocyanates and their biuret, triurea, trimer, trimethylolpropane adducts and mixtures thereof; and/or

B) Di-or tri-oxirane compounds of the formula

A- (Oxiran-2-ylmethyl)_n

Wherein n represents 2 or 3, and 1 represents C optionally containing 2 to 6 nitrogen and/or oxygen atoms₂-C₆A group;

v. optionally, containing two NH groups₂C of functional group₁-C₄A compound;

3) heating the dispersion;

4) cooling the dispersion.

This method is described in more detail in WO2013/068255, the content of which is incorporated herein by reference.

According to another embodiment, the shell of the microcapsules is polyurea-based or polyurethane-based. Examples of processes for preparing polyurea-based and polyurethane-based microcapsule slurries are described, for example, in WO2007/004166, EP2300146, EP2579976, the contents of which are also incorporated herein by reference. The process generally used for preparing polyurea-based or polyurethane-based microcapsule slurries comprises the following steps:

a) dissolving at least one polyisocyanate having at least two isocyanate groups in an oil to form an oil phase;

b) preparing an aqueous solution of an emulsifier or colloidal stabilizer to form an aqueous phase;

c) adding the oil phase to the water phase to form an oil-in-water dispersion, wherein the average droplet size is 25-1000 μm, preferably 100-1000 μm;

d) conditions sufficient to initiate interfacial polymerization are applied and microcapsules in the form of a slurry are formed.

According to the present invention, it is understood that, after encapsulation, the core of the capsule is made of only the core oil consisting of perfume oil, regardless of the nature of the microcapsule.

The hair coloring compositions of the present invention may comprise microcapsules which may vary according to the core perfume oil inside and/or according to the wall (different chemical nature or the same chemical nature, but different process parameters such as cross-linking temperature or duration).

Cationic coating

According to a particular embodiment of the invention, the microcapsules have an outer coating selected from the group consisting of nonionic polysaccharides, cationic polymers and mixtures thereof.

Such a coating will help to drive deposition and retention of the capsules during washing so that most of the capsules that are not broken during use/during the washing stage/lathering will be transferred to the hair and will release perfume when the capsules are broken after rubbing after drying.

Nonionic polysaccharide polymers are well known to those skilled in the art. Preferred nonionic polysaccharides are selected from the group consisting of locust bean gum, xyloglucan, guar gum, hydroxypropyl guar, hydroxypropyl cellulose and hydroxypropyl methylcellulose.

Cationic polymers are also well known to those skilled in the art. Preferred cationic polymers have a cationic charge density of at least 0.5meq/g, more preferably at least about 1.5meq/g, but also preferably less than about 7meq/g, more preferably less than about 6.2 meq/g. The cationic charge density of the cationic polymer can be determined by the kjeldahl method, as described in the united states pharmacopeia, for nitrogen determination in chemical tests. Preferred cationic polymers are selected from those comprising units containing primary, secondary, tertiary and/or quaternary amine groups which may form part of the main polymer chain or may be carried by pendant substituents directly attached thereto. The cationic polymer preferably has a weight average molecular weight (Mw) of between 10,000 and 3.5M daltons, more preferably between 50,000 and 2M daltons.

According to a particular embodiment, cationic polymers based on acrylamide, methacrylamide, N-vinylpyrrolidone, quaternized N, N-dimethylaminomethacrylates, diallyldimethylammonium chloride, quaternized vinylimidazoles (3-methyl-1-vinyl-1H-1-imidazole-3-ammonium chloride), vinylpyrrolidone, acrylamidopropyltrimethylammonium chloride, cassia hydroxypropyltrimethylammonium chloride, guar hydroxypropyltrimethylammonium chloride or polygalactomannan 2-hydroxypropyltrimethylammonium chloride ether, starch hydroxypropyltrimethylammonium chloride and cellulose hydroxypropyltrimethylammonium chloride will be used. Preferably, the copolymer should 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 hydroxypropyltrimethylammonium chloride, guar hydroxypropyltrimethylammonium chloride or polygalactomannan 2-hydroxypropyltrimethylammonium chloride ether, starch hydroxypropyltrimethylammonium chloride and cellulose hydroxypropyltrimethylammonium chloride.

As specific examples of commercially available products, mention may be made ofSC60 (cationic copolymer of acrylamidopropyltrimethylammonium chloride and acrylamide, source: BASF) orSuch as PQ 11N, FC 550 or Style (polyquaternium)-11-68 or quaternized copolymers of vinylpyrrolidone, source: BASF), can also be(C13S or C17, source: Rhodia).

According to a particular embodiment, the microcapsules are polyurea-based microcapsules having a core-shell morphology and comprising:

-an oil-based core comprising a fragrance;

-a shell consisting essentially of a polymeric polyisocyanate consisting of at least one polyisocyanate comprising at least three isocyanate functional groups in the absence of a polyamine or amine and an emulsifier selected from the group consisting of gum arabic, carboxymethyl cellulose, soy protein, caseinate, gelatin, bovine serum albumin, sugar beet pectin, hydrolyzed soy protein, hydrolyzed sericin, pseudocollagen, biopolymer SA-N, Pentacare-NA PF, polyvinyl alcohol, modified starch, modified cellulose, polysaccharides and mixtures thereof, and wherein the microcapsules do not comprise a cationic coating.

According to one embodiment, the microcapsules of the polyurea group are obtained by a process comprising the following steps:

a) mixing a perfume oil with at least one polyisocyanate having at least three isocyanate functional groups to form an oil phase, with the proviso that the oil phase is substantially free of diisocyanates;

b) dissolving an ionic or nonionic emulsifier in water to form an aqueous phase, wherein the ionic emulsifier is selected from the group consisting of gum arabic, carboxymethylcellulose, soy protein, sodium caseinate, gelatin, bovine serum albumin, sugar beet pectin, hydrolyzed soy protein, hydrolyzed sericin, pseudocollagen, biopolymer SA-N, Pentacare-NA PF, and mixtures thereof, and wherein the nonionic emulsifier is selected from the group consisting of polyvinyl alcohol, modified starch, modified cellulose, polysaccharides, and mixtures thereof;

c) adding the oil phase to the aqueous phase to form an oil-in-water dispersion;

d) applying conditions sufficient to cause interfacial polymerization and formation of microcapsules in the form of a slurry;

the method is characterized in that:

at least one polyisocyanate having at least three isocyanate functional groups is present in an amount of 1 to 15% by weight of the oil phase,

no substantial addition of amine or polyamine at any stage of the process, and

it does not comprise the further step of adding a cationic polymer to form an outer coating of the microcapsules.

It has been shown that the burst effect is particularly strong when the average size of the microcapsules is greater than 100 μm.

Thus, according to a particular embodiment, the average size of the microcapsules is greater than 100 μm, preferably from 100 to 500 μm, most preferably from 150 to 500 μm.

According to one embodiment, the microcapsules are used in an amount of 0.1 to 10 wt%, preferably 0.2 to 5 wt%, based on the total weight of the composition.

Of course, the above concentrations can be adjusted according to the olfactory effect desired for each product.

According to the present invention, an oxidative hair coloring composition comprises:

(i) an oxidizing phase comprising an oxidizing agent;

(ii) a basic phase comprising a basic agent, a dye precursor and a coupling compound, and

(iii) core-shell microcapsules having a polymeric shell and a core comprising a perfume oil, the microcapsules having an average size equal to or greater than 25 μm.

The hair coloring composition of the present invention is an oxidative hair coloring composition.

By "oxidative hair dye composition" is meant a composition comprising two groups of leuco dye molecules: a dye precursor and a coupling agent. When reacting with each other through an oxidation process, they form various colored molecules (dyes) which are then trapped in the hair due to their size. In other words, the dye precursor and the coupling compound form an oxidative hair dye in the presence of an oxidizing agent.

In the present invention, "dye precursor" and "oxidation dye precursor" are used indiscriminately.

Dye precursors

The dye precursor may be an aromatic compound derived from benzene substituted at the para-or ortho-position with at least two electron donor groups (e.g. NH)₂And OH) to impart an easily oxidizable characteristic thereto.

According to one embodiment, the dye precursor is selected from the group consisting of p-phenylenediamine, 2, 5-diaminotoluene, N-bis (2-hydroxymethyl) p-phenylenediamine, 4-aminophenol, 1, 4-diaminobenzene, and mixtures thereof.

The primary dye precursor is used in combination with a coupling agent. The coupling agent is preferably derived from benzene substituted in the meta position with e.g. NH₂And OH, and do not alone produce color, but rather change the color, shade, or color intensity formed by the dye precursor.

According to one embodiment, the coupling agent is selected from the group consisting of resorcinol, 2-methylresorcinol, 4-chlororesorcinol, 2, 5-diaminotoluene, 1, 3-diaminobenzene, 2, 4-diaminophenoxyethanol hydrochloride, 2-amino-hydroxyethylaminoanisole sulfate, 4-amino-2-hydroxytoluene, and mixtures thereof.

The oxidation dye precursor is preferably used in an amount of 0.001 to 5 wt%, preferably 0.1 to 4 wt%, based on the total weight of the composition.

The use of oxidative dye precursors and coupling agents in hair coloring formulations is widely disclosed in the prior art and is well known to those skilled in the art. Mention may be made, for example, of EP0946133A1, the content of which is also incorporated herein by reference.

Alkaline phase

The alkaline phase comprises an alkaline agent, preferably selected from the group consisting of ammonia hydroxide, ammonia carbonate, ethanolamine, potassium hydroxide, sodium borate, sodium carbonate, triethanolamine, and mixtures thereof.

The alkaline agent is preferably used in an amount of 1 to 10 wt%, more preferably 3 to 9 wt%, based on the total weight of the composition.

According to the present invention, the coupling agent and the dye precursor in the alkaline medium form an oxidative hair dye in the presence of an oxidizing agent.

Oxidizing agent

The oxidizing agent will provide the necessary oxygen to form color molecules and change the color of the hair.

The oxidizing agent should be safe and effective for use in the compositions herein.

Preferably, the oxidizing agent suitable for use herein will be soluble in the composition according to the invention when used in liquid form and/or in the form intended for use.

Preferably, the oxidizing agent suitable for use herein will be water soluble. Suitable oxidizing agents for use herein are selected from inorganic peroxygen oxidizing agents, preformed organic peroxyacid oxidizing agents and organic peroxide oxidizing agents or mixtures thereof.

The amount of the oxidizing agent is preferably 5 to 30 wt%, more preferably 5 to 25 wt%, based on the total weight of the composition.

Optional Components

The components commonly used in cosmetic compositions may be added to the hair coloring composition as defined herein. Examples thereof include surfactants, cationic polymers, oily substances, silicone derivatives, free perfumes, preservatives, ultraviolet absorbers, antioxidants, bactericides, propellants and thickeners.

According to a particular embodiment, the hair coloring composition comprises one or more quaternary ammonium compounds, preferably selected from the group consisting of cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, benzalkonium chloride, behenyltrimethylammonium chloride and mixtures thereof, to impart a hair care benefit.

The quaternary ammonium compound is preferably used in an amount of 0.1 to 5 wt% based on the total weight of the composition.

Hair dyeing kit

Permanent hair coloring formulations are typically sold in a two-component kit to avoid oxidation reactions prior to use.

Accordingly, another object of the present invention is a hair coloring kit comprising:

(i) a first vessel containing an oxidizing agent; and

(ii) a second container comprising an alkaline agent, a precursor dye, and a coupling compound;

characterised in that the first and/or second container further comprises core-shell microcapsules having a polymeric shell and a core comprising encapsulated perfume oil, the microcapsules having an average size equal to or greater than 25 μm.

According to one embodiment, a hair coloring kit comprises:

(i) a first vessel comprising an oxidation phase, wherein the oxidation phase comprises an oxidant; and

(ii) a second container comprising a basic phase, wherein the basic phase comprises a basic agent, a precursor dye, and a coupling compound;

characterized in that the oxidizing and/or basic phase further comprises core-shell microcapsules having a polymeric shell and a core comprising encapsulated perfume oil, said microcapsules having an average size equal to or greater than 25 μm.

The embodiments previously described for hair coloring compositions are also applicable to hair coloring kits.

According to a preferred embodiment, the microcapsules are present in a container comprising an alkaline agent.

Method for dyeing hair

The hair coloring compositions according to the present invention may be prepared according to methods well known in the art.

In order to apply the hair dyeing composition according to the present invention to the hair, it is only necessary to apply the hair dyeing composition to the hair, leave it at rest, and then wash the hair using shampoo. More specifically, an appropriate amount of the composition is applied to the hair with, for example, a comb or a brush, and the thus-applied hair is left to stand for about 1 to 30 minutes after application and then washed with shampoo.

Therefore, another object of the present invention is a method for coloring hair comprising the steps of:

a) applying to the hair a hair coloring composition as defined above,

b) the hair is allowed to stand, and

c) washing hair with shampoo.

As previously mentioned, since hair coloring formulations are typically provided in a two-component kit to avoid oxidation reactions prior to use, a user may need to mix the contents of the first container with the contents of the second container in the kit prior to applying the composition to the hair.