FR3015243A1 - PROCESS FOR MATIFYING FATTY SKIN WITH POLYTHIOL - Google Patents

Abstract

The invention relates to a cosmetic process for matting oily skin, comprising: a step consisting in applying to the oily skin a cosmetic composition comprising, in a physiologically acceptable medium, at least one compound comprising at least two thiol functions and a photoactive compound and a step of exposing the treated skin to light radiation.

Description

The invention relates to a cosmetic process for mattifying oily skin using a composition comprising a compound comprising at least two thiol functions, a photoactive compound (photoinitiator) and exposure to light of the skin. treated. The shine of the skin, often related to a high secretion of sebum, and in particular of oily skin, is a problem which affects adolescents in particular but which can also manifest itself in adulthood under the effect, in particular, of hyperproduction of androgens. It can also be related to sweat resulting from physical activity or weather conditions. However, a shiny skin is considered unsightly, especially since it often results in less good hold makeup that tends to degrade visually during the day. In order to absorb sebum and excess oil from the composition not absorbed by the skin, use is conventionally made of powders of natural or synthetic origin, among which mention may be made in particular of fillers such as talc, starch, mica, silica, nylon powders, polyethylene powders, poly-beta-alanine, poly (meth) acrylate powders. This type of fillers has the disadvantage of giving the skin a powdery appearance, not natural, which can even accentuate skin defects. In addition, the compositions containing them are generally drying in the long term and their effect is not very durable over time. It thus appears necessary to have other means to matify the oily skin different from the powders already known for this use. The Applicant has demonstrated that by applying to the oily and / or shiny skin a composition comprising at least one compound comprising two or more thiol groups and at least one photoactive compound and exposing the treated skin to light radiation. the shiny appearance of the oily skin could be diminished and thus make it look duller. The subject of the present invention is therefore a cosmetic process for matting oily skin, comprising: a step consisting in applying to the oily skin a composition, in particular a cosmetic composition comprising, in a physiologically acceptable medium, at least one compound comprising two or more two thiol groups, and at least one photoactive compound 40 - a step of exposing the skin to light radiation, preferably for at least 5 seconds. This step can be repeated several times during the day.

The sources of light radiation according to the invention can be almost monochromatic such as sources using "light emitting diodes" (LEDs). In this case, light radiation having a monochromatic wavelength between 360 nm to 600 nm and preferably 400 nm to 480 nm is used.

In this case, the exposure lasts from 5 seconds to 15 minutes. Alternatively, daylight can be used as light radiation. In this case, the skin is exposed to daylight preferably for at least 3 minutes and up to 12 hours.

The step of exposure to light radiation can be repeated several times during the day. The process according to the invention makes it possible to matify oily skin: it has in fact been found that the gloss of the skin is attenuated after the application to the oily skin of the composition comprising the compound with thiol functions and the photoactive compound and exposure to the light of the treated skin. The oily skin thus treated regains a more matte appearance.

By physiologically acceptable medium is meant a medium compatible with keratin materials, which has a pleasant color, odor and feel, and which does not generate unacceptable discomfort (tingling, tightness, redness), which can divert the consumer. For the purposes of the invention, the term "keratin materials" means the skin (body, face, eye contour, scalp) and the lips. One of the steps of the process according to the invention consists in applying to the skin, preferably the skin of the face and / or the eye contour, a cosmetic composition comprising, in a physiologically acceptable medium, at least one thiol-patterned compound. . By thiol-containing compound is meant an entire compound bearing two or more thiol groups SH. It can be a non-polymeric organic molecule carrying two or more thiol groups, a polymer carrying two or more thiol groups, particles carrying two or more thiol groups or particles coated with compound. (s) carrying two or more thiol functions (coating) or particles functionalized by two or more thiol functions.

According to the invention, the names polythiol compound, thiol compound, thiol compound compound or compound comprising at least two thiol functions are equivalent.

The thiol compound according to the invention must not contain vinyl (C = C) or acetylenic (CEC) functions. The thiol unit compound may be aromatic, or heteroaromatic, or include an aromatic radical.

The thiol unit compound according to the invention may also contain one or more heteroatoms chosen from O, N, S and / or one or more functions chosen from the ester, ketone, amide, urea and isocyanurate functions. Preferably, the compound the thiol unit according to the invention may further contain one or more heteroatoms chosen from O, N, S and / or one or more functions chosen from among the ester and ketone functions. According to a first variant, the thiol unit compound according to "invention" denotes a non-polymeric organic compound and can be represented by the formula (I) W (SH) n (I) in which n denotes an integer greater than or equal to 2, preferably between 2 and 10, preferably between 2 and 5. and W denotes a linear or branched or saturated (hetero) cyclic multivalent (at least divalent) C2-C80 radical, an aromatic radical, a heteroaromatic cyclic radical, W which may also contain one or more heteroatoms s, such as O, N, S, and / or one or more functions chosen from esters, ketones, amides, ureas, preferably esters, ketones) and / or be substituted by one or more C1-C10 alkyl groups. linear or branched C1-C10 alkoxy linear or branched, it being understood that when the radical W is substituted, the thiol functions can be borne by the substituent (s). By cyclic radical is meant a saturated monocyclic radical, hydrocarbon or heterocyclic, a saturated or aromatic polycyclic radical for example biphenyl or condensed rings such as for example the naphthyl radical. The molar mass of the compounds of formula (I) is generally between 90 and 1500.

According to a first embodiment, the thiol unit compound of formula (I) is such that n = 2 and W denotes a divalent linear or branched C2-C20 hydrocarbon saturated radical, preferably C2-C12. According to this embodiment, the thiol unit compound of the invention designates, for example, 1,2-ethanedithiol, 1,2-propanedithiol, 1,3-propanedithiol, 1,4-butanedithiol, 1, 6-hexanedithiol, 1,7-heptanedithiol, 1,8-octanedithiol, 1,9-nonanedithiol, 1,10-decanedithiol, 1,12-dodecanedithiol, 2,2-dimethy1-1,3- propanedithiol, 3-methyl-1,5-pentanedithiol, 2-methyl-1,8-octanedithiol, According to a second embodiment, the thiol-containing compound of formula (I) is such that n = 3 and W denotes a linear or branched C3-C20 saturated hydrocarbon trivalent radical, preferably linear or branched C2-C12. According to this embodiment, the thiol unit compound may be chosen for example from 1,1,1-tris (mercaptomethyl) ethane, 2-ethyl-2-mercaptomethyl-1,3-propanedithiol, 1,2,3 propanetrithiol. According to a third embodiment, the thiol unit compound of formula (I) is such that n = 2 or 3 and W denotes a linear or branched linear or branched C 1 -C 20 saturated divalent or trivalent hydrocarbon radical, preferably linear C2-C12 or branched, said radical containing one or more non-adjacent heteroatom (s) selected from O, S. According to this embodiment, the thiol unit compound may be selected for example from C2-C12 bis-mercaptoalkyl ethers and sulfides such as bis (2-mercaptoethyl) ether, bis (2-mercaptoethyl) sulfide, bis (2-mercaptoethylthio-3-mercaptopropane) sulfide, alkanes (C 1 -C 5) bis (2-mercapto alkyl (C 1 -C 3) ) thio) or mercaptoalkanes (C1-05) bis (2-mercapto (C1-C3) alkylthio) such as, for example, bis (2-mercaptoethylthio) methane, 1,2-bis (2-mercaptoethylthio) ethane, 1,3-bis (2-mercaptoethylthio) propane, 1,2-bis (2-mercaptoethylthio) propanethiol, 1,2-bis (2-mercaptoethyl) thio-3-mercaptopropane, 1,2,3 tris (2-me Preferably, according to this embodiment, the compound (I) is chosen from 1,2-bis (2-mercaptoethylthio) propanethiol and 1,2,3-tris (2-mercaptoethylthio). proprane, tetrakis (2-mercaptoethylthiomethyl) methane. According to a fourth embodiment, the thiol unit compound of formula (I) is such that n denotes an integer greater than or equal to 2 and W denotes a linear or branched C3-C20 saturated hydrocarbon saturated (at least divalent) radical of preferably C2-C12 linear or branched, said radical containing at least one ester function. According to this embodiment, the thiol unit compound may be chosen for example from: polyol esters (glycols, triols, tetraols, pentaols, hexaols) and 40 of C1-C6 mercaptocarboxylic acid such as ethylene glycol bis (2-mercaptoacetate), ethylene glycol bis (3-mercaptopropionate), ethylene glycol bis (thioglycolate), trimethylolpropane tris (thioglycolate), trimethylolpropane tris (beta-mercaptopropionate), pentaerythritol tetrakis (thioglycolate), pentaerythritol tetrakis (.beta.-mercaptopropionate), dipentaerylthritol hexakis (.beta.-mercaptoproprionate), trimethylolpropane tris (2-mercaptoacetate), trimethylolpropane tris (3-mercaptopropionate), pentaerythritol tetra-kis (2-mercaptoacetate), pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptobutanate), dipentaerythritol hex 3 -mercaptopropionate, Preferably, according to this embodiment, the thiol-patterned compound is selected from the group consisting of trimethylolpropane tris (2-mercaptoacetate), trimethylolpropane tris (3-mercaptopropionate), pentaerythritol tetrakis (2-mercaptoacetate), pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptobutanate), dipentaerythritol hex -3-mercaptopropionate.

In a particularly preferred manner, the thiol unit compound is pentaerythritol tetrakis (3-mercaptopropionate). According to a fifth embodiment, the thiol unit compound of formula (I) is such that n = 4 and W denotes a C4-C20, preferably branched C8-C14 saturated hydrocarbon saturated radical, interrupted by one or more carbon atoms. According to this embodiment, the thiol unit compound may be chosen for example from tetrakis (2-mercaptoethylthiomethyl) methane, bis (2-mercaptoethylthio-3-mercaptopropane) sulfide. According to a sixth embodiment, the thiol unit compound of formula (I) is such that n = 2 and W denotes a cyclic divalent hydrocarbon radical optionally containing one or more non-adjacent sulfur atoms, optionally substituted by one or more radicals. linear or branched C1-C10 alkyls. According to this embodiment, the thiol unit compound may be chosen for example from 1,4-cyclohexane dithiol, 1,4-bis (mercaptomethyl) cyclohexane, 1,1-cyclohexane dithiol, cyclohexane dithiol, 1,1-bis (mercaptomethyl) cyclohexane, 2,5-dimercapto-1,4-dithiane. According to a seventh embodiment, the thiol unit compound of formula (I) is such that n = 3 and W denotes a cyclic radical of the substituted isocyanurate type. According to this embodiment, the thiol unit compound may be selected for example from the polythiols of the isocyanurate class described in US Pat. Nos. 3,676,440 and US20110230585 such as tris ((mercaptopropionyloxy) ethyl) isocyanurate.

According to this embodiment, the thiol-patterned compound refers to the tris ((mercaptopropionyloxy) -ethyl) isocyanurate. According to an eighth embodiment, the thiol unit compound of formula (I) is such that n = 2 or 3 or 4 and W denotes an aromatic radical optionally substituted by one or more identical or different radicals of C1-C10 alkyl type, C1-C10 alkoxy, it being understood that when the radical W is substituted, the thiol functions may be borne by the substituent (s).

According to this embodiment, the thiol unit compound may be chosen, for example, from 1,2-dimercaptobenzene, 1,3-dimercaptobenzene, 1,4-dimercaptobenzene, 1,2-bis (mercaptomethyl) benzene, , 3-bis (mercaptomethyl) benzene, 1,4-bis (mercaptomethyl) benzene, 1,2-bis (2-mercaptoethyl) benzene, 1,3-bis (2-mercaptoethyl) benzene, 1,4 bis (2-mercaptoethyl) benzene, 1,2-bis (2-mercaptoethyleneoxy) benzene, 1,3-bis (2-mercaptoethyleneoxy) benzene, 1,4-bis (2-mercaptoethyleneoxy) benzene, , 2,3-trimercaptobenzene, 1,2,4-trimercaptobenzene, 1,3,5-trimercaptobenzene, 1,2,3-tris (mercaptomethyl) benzene, 1,2,4-tris (mercaptomethyl) benzene 1,3,5-tris (mercaptomethyl) benzene, 1,2,3-tris (2-mercaptoethyl) benzene, 1,2,4-tris (2-mercaptoethyl) benzene, 1,3,5-tris tris (2-mercaptoethyl) benzene, 1,2,3-tris (2-mercaptoethyleneoxy) benzene, 1,2,4-tris (2-mercaptoethyleneoxy) benzene, 1,3,5-tris (2- mercaptoethyleneoxy) benzene, 1,2,3,4-tetramercaptobenzene, 1 2,3,5-tetramercaptobenzene, 1,2,4,5-tetramercaptobenzene, 1,2,3,4-tetrakis (mercaptomethyl) benzene, 1,2,3,5-tetrakis (mercaptomethyl) benzene, 1,2,4,5-tetrakis (mercaptomethyl) benzene, 1,2,3,4-tetrakis (2-mercaptoethyl) benzene, 1,2,3,5-tetrakis (2-mercaptoethyl) benzene, 1,2,4,5-tetrakis (2-mercaptoethyl) benzene, 1,2,3,4-tetrakis (2-mercaptoethyleneoxy) benzene, 1,2,3,5-tetrakis (2-mercaptoethyleneoxy) benzene, 1,2,4,5-tetrakis (2-mercaptoethyleneoxy) benzene, 2,2'-dimercaptobiphenyl, 4,4'-dimercaptobiphenyl, 4,4'-dimercaptobibenzyl, 2,5-toluenedithiol, 3 , 4-toluenedithiol, 1,4-naphthalenedithiol, 1,5-naphthalenedithiol, 2,6-naphthalenedithiol, 2,7-naphthalenedithiol, 2,4-dimethylbenzene-1,3-dithiol, 4,5 1,3-bis (2-mercaptoethylthio) benzene, 1,4-bis (2-mercaptoethylthio) benzene, 1,2-bis (2-dimethylbenzene-1,3-dithiol, 9,10-anthracenedimethanethiol, 1,3-bis (2-mercaptoethylthio) benzene) -mercaptoethylthiomethyl) benzene, 1,3-bis (2-mercaptoethylthiomethyl) benzene, 1,4-bis (2-mercaptoethylthiomethyl) benzene, 1,2,3-tris (2-mercaptoethylthio) benzene, 1,2,4-tris (2-mercaptoethylthio) benzene, 1,3,5-tris (2-mercaptoethylthio) benzene, 1,2,3,4-tetrakis (2-mercaptoethylthio) benzene, 1,2,3,5-tetrakis (2-mercaptoethylthio) benzene, 1,2,4,5- tetrakis (2-mercaptoethylthio) benzene, 3,4-thiophenedithiol ,. According to this embodiment, the compound (I) is chosen from 1,2,3-trimercaptobenzene, 1,2,4-trimercaptobenzene, 1,3,5-trimercaptobenzene, 1,2,3-tris ( mercaptomethyl) benzene, 1,2,4-tris (mercaptomethyl) benzene, 1,3,5-tris (mercaptomethyl) benzene, 1,2,3-tris (2-mercaptoethyl) benzene, 1,2, 4-tris (2-mercaptoethyl) benzene, 1,3,5-tris (2-mercaptoethyl) benzene, 1,2,3-tris (2-mercaptoethyleneoxy) benzene, 1,2,4-tris (2-mercaptoethyl) benzene, mercaptoethyleneoxy) benzene, 1,3,5-tris (2-mercaptoethyleneoxy) benzene, 1,2,3,4-tetramercaptobenzene, 1,2,3,5-tetramercaptobenzene, 1,2,4,5 tetramercaptobenzene, 1,2,3,4-tetrakis (mercaptomethyl) benzene, 1,2,3,5-tetrakis (mercaptomethyl) benzene, 1,2,4,5-tetrakis (mercaptomethyl) benzene, 2,3,4-tetrakis (2-mercaptoethyl) benzene, 1,2,3,5-tetrakis (2-mercaptoethyl) benzene, 1,2,4,5-tetrakis (2-mercaptoethyl) benzene, 1,2,3,4-Tetrakis (2-mercaptoethyleneoxy) benzene, 1,2,3,5-tetrakis (2-mercaptoethyleneoxy) benzene, 1,2,4,5-Tetrakis (2-mercaptoethyleneoxy) benzene, 1,2,3-tris (2-mercaptoethylthio) benzene, 1,2,4-tris (2-mercaptoethylthio) benzene, 1, 3,5-tris (2-mercaptoethylthio) benzene, 1,2,3,4-tetrakis (2-mercaptoethylthio) benzene, 1,2,3,5-tetrakis (2-mercaptoethylthio) benzene, 1,2,3,5-tetrakis (2-mercaptoethylthio) benzene, , 4,5-Tetrakis (2-mercaptoethylthio) benzene, 3,4-thiophenedithiol. According to a ninth embodiment, the thiol unit compound of formula (I) is such that n = 2 or 3 or 4 and W denotes a fatty acid triglyceride or vegetable oil, optionally substituted, it being understood that when the radical W is substituted, the thiol functions can be carried by the substituent (s). According to this embodiment, the thiol unit compound may be chosen for example from: triglycerides of fatty acids or vegetable oils modified with thiol groups by chemical reaction, for example thiolated soybean oils and soybean oil and thiolated products, in particular the polymercaptan® products from Chevron Phillips, such as polymercaptan 358 (mercaptanised soybean oil) and polymercaptan 407 (mercapto hydroxy soybean oil) 0 SH -O-LL (CH 2) 7 SH HS 01-1- ( According to this first variant, the compounds of formula (I) for which n denotes an integer greater than or equal to 3, preferably of between 3 and 10 and more preferably of between 3 and 10, will be preferred. 5. Preferably, according to this variant, the compounds of formula (I) are chosen from the compounds of the second embodiment; or among the compounds of the third embodiment; or among the compounds of the fourth embodiment, such as trimethylolpropane tris (2-mercaptoacetate), trimethylolpropane tris (3-mercaptopropionate), pentaerythritol tetrakis (2-mercaptoacetate), pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptobutanate), dipentaerythritol hex-3-mercaptopropionate; or among the compounds of the fifth embodiment; or among the compounds of the seventh embodiment, such as in particular tris ((mercaptopropionyloxy) -ethyl) isocyanurate. Particularly preferably, according to this variant, the compounds of formula (I) denote trimethylolpropane tris (2-mercaptoacetate), trimethylolpropane o (cH2) 8cH3 tris (3-mercaptopropionate), pentaerythritol tetrakis (2-mercaptoacetate) ), pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptobutanate), dipentaerythritol hex-3-mercaptopropionate, tris ((mercaptopropionyloxy) -ethyl) isocyanurate.

According to a second variant, the thiol unit compound according to the invention denotes a polymeric compound and can be represented by the formula (II) POL (SH) n (II) in which n denotes an integer greater than or equal to 5, preferably between 5 and 5000, preferably between 5 and 1000. and POL denotes a multivalent (at least pentavalent) polymeric radical carbon or silicone, POL may additionally contain one or more heteroatoms such as O, N, S, and / or a or more functions selected from ester, ketone, amide, urea, carbamate functions, and / or be substituted by one or more linear or branched C1-C10 alkyl or C1-C10 linear or branched alkoxy groups, it being understood that when POL is substituted the thiol functions can be carried by the substituent (s).

The molar mass of the compounds of formula (II) is generally between 500 and 400,000, preferably between 500 and 150,000. POL may designate a multivalent radical of the homopolymer or copolymer type; POL may denote a polymeric radical of star, comb, brush or denititic type. The POL radical may be of natural origin (such as polysaccharides, peptides) or synthetic (such as acrylic polymers, polyesters, polyglycols). The thiol functions (-SH) may be terminal and / or pendant groups.

According to a first embodiment, the thiolated compound of formula (II) is such that POL denotes a polymeric hydrocarbon radical. Examples include the polymers described in the following articles: Polymers containing groups of biological activity, CG Overberger et al., Polytechnic Institute of Brooklyn, http://pac.iupac.org/publications/pac/pdf/1962/pdf/ 0402x0521.pdf and Mercaptan-containing polymers, Advances in Polymer Science Volume 15, 1974, pp 61-90. In particular, mention may be made of thiol-containing compounds of formula (II) such as poly (vinylmercaptan), poly (4-mercaptostyrene), poly (vinylbenzylmercaptan), poly (4-mercaptostyrene) -co-poly (methylmethacrylate), and also polymers containing the amide functions in the polymer such as poly (hexamethylene adipamide thiolated).

The compounds of formula (II) also denote proteins and peptides with thiol units, for example the structures represented in the following table: ## STR1 ## ## STR2 ## ## STR2 ## ## STR2 ## ## STR2 ## ## STR2 ## -12 cH2 - SH SH SH oo CH3 II II -OCH, -CH-CH, -CH2-O-C-NH-R-NH-C --- -CH2 --- C CH2 i SH CO CH-OCO The thiolated compound of formula (II) also denotes compounds of formula (II) such that POL denotes a so-called dendrimer radical, branched or hyperbranched polymer and the thiol groups are terminal. Examples are the polymers described in the article Proqress in Orqanic Coatinqs, Volume 63, Is. 1, July 2008, Pages 100-109.

As an example of synthesis of such polymers, mention may be made of the synthesis described in this article, in which the Boltorn H40 polymer is converted into the thiolated polymer of formula (II) according to the scheme below: The structure of the thiolated polymer (II) obtained is given below. The thiol-form compound of formula (II) may also denote a hyperbranched or dendritic polymer modified with thiol functions as described in patent application FR 2761691.10 Polypropylene ether glycol bis (beta-mercaptopropionate) type polymers are also usable. They are prepared from polypropylene ether glycol (e.g., Pluracol P201, Wyandotte Chemical Corp.) and beta-mercaptopropionic acid by esterification reaction and known to those skilled in the art.

Certain thiol-patterned polymers of formula (II) are also commercially available such as THIOCURE® products from Bruno Brock, THIOCURE® ETTMP 1300 (Ethoxylated-Trimethylolpropan Tri-3-Mercaptopropionate (CAS # 345352-19-4) and THIOCURE® ETTMP 700 (Ethoxylated-Trimethylolpropan Tri-3-Mercaptopropionate (CAS # 345352-19-4) According to a second embodiment, the compound of formula (II) is such that POL denotes a polymeric silicone radical. polythiol inorganic polymers include polythiol silicones The polythiol silicones are especially polydimethylsiloxane comprising two or more thiol groups such as for example the products SMS20 022, SMS 042 and SMS 992 sold by the company Gelest Inc. S C11 .CII2 i According to a third variant, the thiol-containing compound is a particle bearing two or more thiol groups (radical-functionalized silica, e.g. alkyl-type example, substituted with thiol functions) or a particle coated with compound (s) carrying two or more thiol functions (coating), said particle being able to be a sphere, a fiber, a rod, an amorphous structure .

According to a first embodiment, the thiol-containing compound is a particle carrying two or more thiol groups (silica functionalized with radicals, for example of the alkyl type, substituted by thiol functions).

According to this embodiment, the thiol-patterned compound may designate the particles sold under the name SiliaMetS® Thiol by Silicycle or under the name SP-THIO-SILICA by Suprasciences.

The thiol-containing compound may denote polythiol silicas prepared according to the procedure described in. J. Mater. Chem., 2007, 17, 3726-3732; J. Am. Chem. Soc., 2005, 127 (23), pp 8492-8498; 10.1109 / ICBBE.2010.5517542; Chemical Engineering Journal, 2011, 171 (3), 1004-1011; Minerals Engineering, 2012, 35, 20-26; Colloids and Surfaces A: Physicochemical and Engineering Aspects, 380, (1-3), 229-233), Advanced Science, Engineering and Medicine, Volume 5, Number 9, September 2013, pp. 984-987 (4) The particle bearing two or more thiol groups may also be obtained by reacting a silica particle such as Sunsphere® particles marketed by Asahi Glass with mercaptoalkylalkoxysilanes such as 3-mercaptopropyltriethoxysilane. Preferably, the thiol-containing compound is a particle bearing two or more thiol groups obtained by reacting a Sunsphere® silica particle marketed by Asahi Glass, preferably a Sunsphere particle of 5 μm with 3-mercaptopropyltriethoxysilane according to US Pat. publicationJournal of Chromatopraphy A, Volume 1217, Issue 47, 19 November 2010, Pages 7448-7454. According to a second embodiment, the polythiol particles may be present in the form of latices (bearing thiol groups (Colloids and Surfaces A: Physiochemical and Engineering Aspects 153_1999, 421-427) According to a third embodiment, the compound The thiol unit is a coated particle of compound (s) having two or more thiol functional groups, The preferred thiol unit compound, whether they are compounds of formula (I), compounds of formula (II) or particles (according to the third variant), are those for which the odor is zero or low so that it can be masked if necessary by the presence of other additional ingredients present in the composition. with thiol units, is preferably present in the composition, in an amount ranging from 0.001% to 95% by weight, relative to the total weight of the composition, preferably ranging from 0.01% to 50% by weight, preferably from 0.5 to 10% by weight, more preferably from 0.1 to 5% by weight. The second ingredient ii) used in the process of the invention is a photoactive compound.

By "photoactive compound" also called PACs (PhotoActive Compounds) or photoinitiators (photoinitiators: PI), is meant a compound capable of absorbing light and of transforming itself by generating atoms or molecules having a radical chemical reactivity (see for example Macromol Rapid Common Christian Decker, 23, 1067-1093 (2002), Encyclopedia of Polymer Science and Technology, "free radical photopolymerization" http://onlinelibrary.wiley.com/doi/10.1002/0471440264.pst490/pdf; "Photopolymerization, cationic", http://onlinelibrary.wiley.com/doi/10.1002/0471440264.pst491/pdf; Macromol., Sym., 143, 45-63 (1999)). These photoactive compounds are not chemical oxidizing agents such as peroxides including hydrogen peroxide or systems generating hydrogen peroxides. Two major families are to be distinguished: The type I family in which the photoactive compounds will, under irradiation, cause a unimolecular cleavage of the covalent bond to lead to a free radical compound also symbolized by a "point" =, and - The type II family in which the photactive compounds under irradiation will lead to a bimolecular reaction in which the excited state of the photoactive compounds interacts with a second molecule (or co-initiator) to generate free radicals. More particularly, the active compound is chosen from the compounds of formula (VI), (VII), (VIII) or (IX), as well as their salts of organic or inorganic acid, their optical, geometric isomers, tautomers and their solvates. such as hydrides: ## STR5 ## R 1 R 1 (VIII) (IX) Formula (VI), (VII), (VIII) or (IX) in which: - R represents a group chosen from: i) (Ci-Cio) alkyl, optionally substituted, preferably by one or a plurality of atoms or groups selected from halogen, hydroxy, (Ci-Cio) alkoxy, (hetero) cycloalkyl comprising between 5 and 10 members such as morpholinyl, and amino RaRbN- with Ra, Rb, identical or different, representing a hydrogen atom or a (C 1 -C 10) alkyl group or alternatively Ra and Rb together with the nitrogen atom carrying them a heteroaryl or heterocycloalkyl group such as morpholino; ii) (C1-C10) alkoxy optionally substituted, preferably by the same substituents as for i) (C1-C10) alkyl; iii) hydroxy; iv) optionally substituted hetero) aryl such as optionally substituted phenyl of formula (X) R 'Ravec R'1, R'2, R'3, identical or different, being as defined for R1, R2 , R3 and representing the point of attachment to the rest of the molecule; y) (hetero) cycloalkyl optionally substituted preferably with a hydroxy group; (vi) R 4 - (X) n - C (X) - (X), -, - with R 4 representing an optionally substituted (C 1 -C 10) alkyl, optionally substituted (hetero) aryl group such as optionally substituted phenyl of optionally substituted formula (X), (hetero) cycloalkyl, n and n ', which may be identical or different, ranging from 0 to 1; vii) RCRdP (X) - with Rb representing an optionally substituted (C1-C10) alkyl group, or optionally substituted (hetero) aryl, and Rd representing an optionally substituted (hetero) aryl group; viii) or else R1 with R in ortho of the group C (X) -R or R "and R" 1 in ortho of the group R'-Y + -R "together with the atoms which carry them a (hetero) ring fused to the phenyl or (hetero) aryl fused to the optionally substituted phenyl especially on the non-aromatic part by one or more oxo group, or thiooxo, preferably R1 with R in the ortho group C (X) -R form together with the atoms which carry and the fused phenyl ring an anthraquinone group (XI): (XI) - R1, R2 or R3, identical or different, represent a i) hydrogen atom, ii) halogen such as chlorine, iii) a group ( C 1 -C 10) optionally substituted alkyl, iv) (C 1 -C 10) alkoxy optionally substituted, in particular with an optionally substituted hydroxy, y) (hetero) aryl group, vi) (hetero) cycloalkyl optionally substituted, vii) carboxy, viii) cyano, ix) nitro, x) nitroso, xi) -S (O) p-OM with p valant 1 or 2, M representing a hydrogen atom, an alkali metal or alkaline earth, xii) R4R5N-; xiii) R4- (X), -C (X) - (X), - with R4, n and n 'as defined previously, R5 is as defined for R4 or R4 and R5 form together with the nitrogen atom which carries them an optionally substituted heterocycloalkyl or heteroaryl such as morpholino, identical or different, ranging 0 or 1, xiv) hydroxy, or xv) thiol; - R "1, R" 2 or R "3, identical or different, are as defined for R1, R2, R3, preferably are chosen from hydrogen or R4-Y - with R4 being as defined previously and preferably a phenyl group - or else R and R1 contiguous, together with the carbon atoms which carry them, form an optionally unsaturated and optionally substituted (hetero) cycloalkyl group, preferably optionally substituted cycloalkyl and in particular by one or more oxo group and / or optionally fused with an aryl group such as benzo; or two contiguous substituents R1, R2 and / or R'1, R'2 together form a group derived from maleic anydryde such as -C (X) -XC (X) -X, identical or different, represents an oxygen atom, sulfur or an NR5 group with R5 as defined above, preferably representing a hydrogen atom or a group (Ci-Cio) alkyl, more particularly X represents an oxygen atom Y is as defined for X, preferably Y represents a sulfur atom; Metal represents a transition metal such as iron or chromium, preferably Fe ', said metal may be cationic in which case the photoactive compound of formula (XVIII) comprises an anionic counterion number An "as defined above, allowing to achieve the electroneutrality of the molecule; - L and L ', identical or different, representing a transition metal ligand preferably selected from the following electron donors C (X) with X as defined above, cyano CN Optionally substituted (C1-C6) alkenyl, (hetero) aryl such as bipyridinyl, amines such as amines R4R5R6N with R4 and R5 as defined above and R6 representing a hydrogen atom, or a group as defined for R4, phosphine R4R5R6P such that the tri (hetero) arylphosphine, (hetero) cycloalkyl is preferably unsaturated such as cyclopentadiene, carbene as arduengo carbene, q representing an integer inclusive incl advantageously between 1 and 6, making it possible to reach the stability of the metal complex i.e. so as to obtain a number of electrons around the metal equal to 16 or 18 electrons (we also speak of coordination sphere with 16 or 18 electrons),; R 'and R ", which may be identical or different, represent an optionally substituted (hetero) aryl group; An" represents an anionic counterion as defined above preferably chosen from (1-1a1) 613-' or (1-1a1) 6S1D- 'with Hal, identical or different, representing a halogen atom such as fluorine; and Ra, Rb, Rc or Rd, which may be identical or different, represent a hydrogen atom or a (Ci-Cio) alkyl group. According to a preferred embodiment of the invention, the photoactive compound (s) are chosen from the following compounds: CAS No. Benzophenone 0000119-61-9 Benzophenone, 2-methyl-0000131-58-8 Benzophenone, 4-methyl-0000134-84 Benzoic acid, 2-benzoyl-, methyl ester 0000606-28-0 Benzophenone, 3-methyl-0000643-65-2 2-Isopropylthioxanthone 0005495-84-1 Benzoic acid, 4- (dimethylamino) -ethyl ester 0010287 Benzoic acid, p- (dimethylamino) -, 2-ethylhexyl ester 0021245-02-3 Poly (ethylene glycol) bis (p-dimethylaminobenzoate) 0071512-90-8 Phosphine oxide, diphenyl (2,4,6- trimethylbenzoyl) - 0075980-60-8 4-Isopropylthioxanthone 0083846-86-0 144- (2-Hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propan-1-one 0106797-53-9 1-Butanone 2- (dimethylamino) -144- (4-morpholinyl) phenyl] -2- (phenylmethyl) -O119313-12-1 1-butanone, 2- (dimethylamino) -2 - [(4-methylphenyl) methyl] -1 - [4- (4-morpholinyl) phenyl] - 0119344-86-4 Phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide 0162881-26-7 Benzene, (1-meth) ylethenyl), homopolymer, ar- (2-hydroxy-2-methyl-1-oxopropyl) derivs. Oxy-phenyl-acetic acid 2- [2-oxo-2-phenyl-acetoxy-ethoxy] - 0211510-16-6 ethyl ester Oxy-phenyl-acetic 2- [2-hydroxy-ethoxy] -ethyl Ester 0442536-99-4 Poly [oxy (methy1-12-ethandyl)], alpha- [4- (dimethylamino) benzoyl-omega-butoxy O234346-45-4 1- (4 - [(4-Benzoylphenyl) thio] phenyl) -2-methyl-2 - [(4-methylphenyl) sulfonyl] -1-propan-1-one 0272460-97-6 2-Hydroxy-1- (4- (4- (2-hydroxy-2 - 0474510-57-1 methylpropionyl) benzyl) phenyl-2-methyl-2-propanone Di-ester of carboxymethoxy benzophenone and polytetramethylene glycol 250 0515136-48-8 Di-ester of carboxymethoxy-benzophenone and polyethylene glycol Poly (oxy-1,4-butanediyl), .alpha .- [2 - [(9-oxo-9H-thioxanthenyl) oxy] acetyl] - .omega .- [[2 - [(9-oxo-9Hthioxanthenyl) oxy] acetyl] oxy] - 0813452-37-8 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone 0106797-53-9-OH OH (Methylamino) diethane-2,1-diisbis (4-dimethylamino amino benzoate) Riboflavin Anthraquinone, 2-ethyl-0000084-51-5 Thioxanthen-9-one, 2-chloro-0000086-39-5 Benzo phenone, 4,4'-bis (diethylamino) -0000090-93-7 Phosphine oxide, triphenyl-0000791-28-6 Methanone, (1-hydroxycyclohexyl) phenyl-0000947-19-3 Methanone, phenyl (2,4,6-bis (diethylamino)) -trimethylphenyl) - 0000954-16-5 Glyoxylic acid, phenyl-, ethyl ester 0001603-79-8 4-Phenylbenzophenone 0002128-93-0 Benzoic acid, 2- (dimethylamino) ethyl ester 0002208-05-1 Acetophenone, 2,2 1H-Imidazole, 2- (2-chlorophenyl) -1- [2- (2-chlorophenyl) -4,5-diphenyl-2H-imidazol-2-yl] -4,5-diethoxy-1-yl-imidazol 1-propanone, 2-hydroxy-2-methyl-1-phenyl-0007473-98-5 d, 1-camphorquinone 0010373-78-1 Glyoxylic acid, phenyl-, methyl ester 0015206- 55-0 2,2-Dimethoxy-2-phenylacetophenone 0024650-42-8 Phenoxyethylacrylate 0048145-04-6 0000606-28-0 0119313-12-1 0010287-53-3 Methyl-2-benzoylbenzoate 2-Benzyl-2- ( dimethylamino) -4-morpholino butyrophenone Ethyl-4-dimethylamobenzoate Iodonium, bis (4-methylphenyl) -, hexafluorophosphate (1-) 0060565-88-0 bis (4-tert-butylphenyl) iodonium hexafluorophosphate 0061358-25-6 1, 2-Propanedione, 1-phenyl-, 2- [O- (ethoxycarbonyl) oxime] 0065894-76-0 Benzoic acid, 4- (dimethylamino) -, 2-butoxyethyl ester 0067362-76-9 Sulfonium, diphenyl [(phenylthio) phenyl] -, hexafluorophosphate (1-) (1: 1) 0068156-13-8 1-Propanone, 144- (1,1-dimethylethyl) phenyl] -2-hydroxy-2-methyl-0068400-54-4 Sulfonium, diphenyl [4- (phenylthio) phenyl] -, (OC-6-11) -hexafluoroantimonate (1-) (1: 1) 0071449-78-0 Iodonium, bis (4-dodecylphenyl) -, (OC-6-11 ) Hexafluoroantimonate (1-) (1: 1) 0071786-70-4 1-Propanone, 2-methyl-1 - [(4-methylthio) phenyl] -2- (4-morpholinyl) - 0071868-10-5 1H- Azepine-1-propanoic acid, hexahydro-, 2,2-bis [[(1-oxo-2-propenyl) oxy] methyl] butyl ester 0073003-78-8 Bis (4-diphenylsulphonium) phenylsulphide-bis (hexafluorophosphate) 0074227 Diphenyl [(phenylthio) phenyl] sulfonium hexafluorophosphate 0075482-18-7 Anthracene, 9,10-dibutoxy 0076275-14-4 2,4-D-ethyl-9H-thioxanthen-9-on 0082799-44- 8 9H-Thioxanthene-2-carboxylic acid, 9-oxo-ethyl ester 0083817-60-1 Methanone, [4 - [(4-methylp henyl) thio] phenyl] phenyl- 0083846-85-9 Phosphinic acid, phenyl (2,4,6-trimethylbenzoyl) ethyl ester 0084434-11-7 Triphenyl sulfonium hexafluorophosphate (mono + di) salts 0086481-78-9 Tryptophan 000073-22-3 Thiobis (4,1-phenylene) -S, S, S ', N'-tetraphenyldisulfonium bis-hexafluoroantimonate 0089452-37-9 Triphenylsulfonium hexafluorophosphate 0104558-95-4 Bis (eta (5) -cyclopentadienyl) - bis (2,6-difluoro-3- [pyrrol-1-yl] phenyl) titanium 0125051-32-3 1-Chloro-4-propoxythioxanthone 0142770-42-1 Phosphine oxide, bis (2,6-dimethoxybenzoyl) (2,4,4 trimethylpentyl) - (9Cl) 0145052-34-2 Iodonium, [4- (1-methylethyl) phenyl] (4-methylphenyl) -, tetrakis (2,3,4,5,6- pentafluorophenyl) borate (1-) (1: 1) 0178233-72-2 4,4'-Bis (methylethylamino) benzophenone 0194655-98-6 Iodonium, (4-methylphenyl) [4- (2-methylpropyl) phenyl] - hexafluorophosphate (1-) 0344562-80-7 9H-thioxanthenium, 1041,1'biphenyl] -4-yl-2- (1-methylethyl) -9-oxo, hexafluorophosphate 0591773-92-1 Oxirane, 2- methyl-, polymer with oxirane, 2-benzoylb Nzoate 1003557-16-1 {α-4- (Dimethylamino) benzoylpoly (oxyethylene) -poly [oxy (1-methylethylene)] - poly (oxyethylene)} -4- (dimethylamino) benzoate 1003557-17-2 1.3- Di ({α-2- (phenylcarbonyl) benzoylpoly [oxy (1-methylethylene)]} oxy) -2,2-bis ({α-2- (phenylcarbonyl) benzoylpoly [oxy (1-methylethylene)]} oxymethyl) propane 1003567-82-5 1,3-Di ({a- [1-chloro-9-oxo-9H-thioxanthen-4- (1003567-83-yl) oxy] acetylpoly [oxy (1-methylethylene)]} oxy) 2,2-bis ({α- [1-chloro-9-oxo-9H-thioxanthen-4-yloxy] acetylpoly [oxy (1-methylethylene)]} oxymethyl) propane 1,3-Di ({-4- (dimethylamino) benzoylpoly [oxy (1-methylethylene)]] oxy) -2,2-bis ({4- (dimethylamino) benzoylpoly [oxy (1-methylethylene)]} oxymethyl) propane 1003567-84-7 Poly (oxy) -1,2-ethanediyl), a- [2- (4-chlorobenzoyl) benzoyl] -w - [[2- (4-chlorobenzoyl) benzoyl] oxy] - 1007306-69-5 2-Propenoic acid, 1.1 1- [9 - [[(1-Fluoro-9-oxo-9H-thioxanthen-4-yl) oxy] methyl]] 7,12-dimethyl-3,6,6,11,13,16-hexaoxaoctadecan-1 , 18-diyl] ester 1253390-33-8 2,3-Dihydroxy-6- (2-hydroxy-2-methyl-1-oxopropyl) 1) -1,1,3-Tri-Methyl-3- [4- (2-hydroxy-2-methyl-1-oxopropyl) phenyl] -1-Hindene 2-Hydroxy- [4 '- (2-hydroxypropoxy) phenyl] -2-methylpropanone Polyethylene glycol (200) di (p-4 [p-acetylphenyl] piperazine) propionate Polyethylene glycol (200) di (p-4 [4- (2-dimethylamino-2-benzyl) butanoylphenyl] piperazine) propionate 2 Hydroxy-4 '- (2-hydroxyethoxy) -2-methylpropiophenone 1,3-di ({α-2- (phenylcarbonyl) benzoylpoly [oxy (1-methylethylene)]} oxy) -2,2-bis ({ α-2- (phenylcarbonyl) benzoylpoly [oxy (1-methylethylene)]} oxymethyl) propane 1003567-82-5 1, 3-Di ({a-2- (phenylcarbonyl) benzoylpoly [oxy (1-methylethylene)]} oxy) -2,2-bis ({a-2- (phenylcarbonyl) benzoyl-1003567-82-5 poly [oxy (1-methylethylene)]} oxymethyl) propane 1,3-Di ({4- (dimethylamino)} benzoylpoly [oxy (1-methylethylene)]] oxy) -2,2-bis ({4- (dimethylamino) benzoylpoly [oxy (1-methylethylene)]} oxymethyl) propane 1003567-84-7. photoactive dyes called "photosensitizing dyes" such as ethyl eosin, eosi Y, fluorescein, bengal rose, methylene blue, erythrosine, phloxime, thionine, riboflavin, and methylene green. According to a particular embodiment of the invention, use will be made of a combination of photoactive compounds containing 1 to 5 photoactive compounds in a mixture, in particular in proportions of 0.001 to 4% by weight for each photoactive compound relative to the total weight of the composition.

Particularly preferred photoactive compounds are chosen from: Designation CAS No. Poly (ethylene glycol) bis (p-dimethylaminobenzoate) 0071512-90-8144- (2-Hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propane 1-one 0106797-53-9 1-Butanone, 2- (dimethylamino) -144- (4-morpholinyl) phenyl] -2- (phenylmethyl) - 0119313-12-1 Phenyl bis (2,4,6-trimethylbenzoyl) ) phosphine oxide 0162881-26-7 Benzene, (1-methylethenyl) -, homopolymer, ar- (2-hydroxy-2-methyl-1-oxopropyl) derivs. 0163702-01-0 2-Hydroxy-4 '- (2-hydroxyethoxy) -2-methylpropiophenone Oxy-phenyl-acetic acid 2- [2-oxo-2-phenyl-acetoxyethoxy] ethyl ester 0211510-16- Oxy-phenyl-acetic 2- [2-hydroxy-ethoxy] -ethyl ester 0442536-99-4 Poly [oxy (methyl-12-ethanyl)], alpha- [4- (dimethylamino) benzoyl-omega-butoxy] 0223463-45-4 2-Hydroxy-1- (4- (4- (2-hydroxy-2- [0474510-57-1 methylpropionyl] benzyl) phenyl-2-methyl-2-propanone 4- (2-hydroxyethoxy) phenyl - (2-hydroxy-2-propyl) ketone 0106797-53-9 d, 1-Camphorquinone 0010373-78-1 2,2-Dimethoxy-2-phenylacetophenone 0024650-42-8 1-Propanone, 144- (1,1 dimethylethyl) phenyl] -2-hydroxy-2-methyl-1-propanone, 2-methyl-1 - [(4-methylthio) phenyl] -2- (4-morpholino) -2- 4,4'-Bis (methylethylamino) benzophenone 0194655-98-6 {α-4- (Dimethylamino) benzoylpoly (oxyethylene) -poly [oxy (1-methylethylene)] - poly (oxyethylene)} 4- (dimethylamino) benzoate 1003557-17-2 1,3-Di ({a-2- (phenylcarbonyl) benzoylpoly [oxy (1-methylethylene)]} oxy) -2,2-bis ({a-2- (phenylcarbonyl) benzoyl) ly [oxy (1-methylethylene)]} oxymethyl) propane 1003567-82-5 1,3-Di ({4- (dimethylamino) benzoylpoly [oxy (1-methylethylene)]} oxy) -2,2-bis ( {4- (dimethylamino) benzoylpoly [oxy (1-methylethylene)]} oxymethyl) propane 1003567-84-7 Poly (oxy-1,2-ethanediyl), a- [2- (4-chlorobenzoyl) benzoyl] - N - [[2- (4-chlorobenzoyl) benzoyl] oxy] 1007306-69-5 2-Hydroxy- [4 '- (2-hydroxypropoxy) phenyl] -2-methylpropanone Polyethylene glycol (200) di (p-4) [p-acetylphenyl] piperazine) propionate Polyethylene glycol (200) di (p-4- [4- (2-dimethylamino-2-benzyl) butanoylphenyl] piperazine) propionate Preferably, the photoactive compound refers to 2-hydroxy-4 ' - (2-hydroxyethoxy) -2-methylpropiophenone.

The photoactive compound (or the mixture of photoactive compounds) is preferably present in the composition, in an amount ranging from 0.001% to 20% by weight, relative to the total weight of the composition, preferably ranging from 0.01% to 10% by weight, preferably ranging from 0.05 to 5% by weight, more preferably from 0.1 to 3% by weight.

Composition The composition according to the invention may be in any of the galenical forms conventionally used for topical application and in particular in the form of aqueous gels, aqueous or aqueous-alcoholic solutions. It may also, by addition of a fatty or oily phase, be in the form of a dispersion of the lotion type, of a liquid or semi-liquid consistency emulsion of the milk type, obtained by dispersion of a fatty phase in an aqueous phase. (W / O) or conversely (W / O), or suspension or emulsion of soft, semi-solid or solid consistency of the cream or gel type, or multiple emulsions (W / O / W or O / W). / H), microemulsion, vesicular dispersion of ionic and / or nonionic type, or dispersion wax / aqueous phase, or even anhydrous composition, or solid composition. These compositions will be prepared by those skilled in the art according to the usual methods. They may further comprise, in the physiologically acceptable medium, the ingredients generally used in this type of product and well known to those skilled in the art, such as water, waxes, oils, gelling agents, thickeners, film-forming polymers, fillers, dyes, preservatives, perfumes, and mixtures thereof. Light Radiation The method according to the invention also comprises a step of exposing the skin to light radiation preferably having a wavelength of between 400 and 480 nm. The irradiation is preferably irradiation with radiation in the UVA or in the visible range, and still more preferably radiation in the visible range. By irradiation in the visible range is meant in the sense of the present invention, either an irradiation carried out with a suitable device (laser or lamps), or the simple action of daylight.

Preferably, the light radiation used in the process according to the invention has a wavelength of between 400 and 480 nm. The light radiation preferably has a fluence (amount of energy per unit area) ranging from 3 to 100 J / cm 2, preferably from 3 to 10 J / cm 2.

The light radiation can be natural light (daylight). The light radiation may be continuous or non-continuous light. As a source of light radiation, arc lamps such as xenon lamps and mercury lamps, fluorescent lamps, incandescent lamps such as halogens, LEDs and lasers can be mentioned. These include the Philips goLITE BLU, Philips Energylight HF 3319/01, Dayvia White and Messa lamps by Solvital, Lumino Plus lamp by Lanaform, 35 dibeam from Medibeam, the M-LED 01 lamp from Meimed, the Lifemax light pod lamp from Lifemax, the Lite-Pad lamp from Reicorp, the Baby Blue lamp from Quasar Biotech, the OMNI300 from the LOT-ORIEL Company and the Camag Box 3 (4x8W) lamp from the company Camag, 40 Process The non-therapeutic cosmetic process according to the invention comprises a step of application to the keratin materials of the cosmetic composition comprising a compound comprising two or more thiol groups, and at least one photoactive compound, followed by a step of exposing said compositions deposited on the keratin materials to light radiation, in particular having a long wavelength between 360 and 600 nm.

It is possible to proceed with a rinsing step, for example with water, of the skin between each step of the process, or at the end of the process. It is also possible to leave the composition according to the invention before proceeding to the light irradiation and / or rinsing step.

According to one particular form of the invention, the cosmetic process for mattifying oily skin comprises: a step of applying to the oily skin a composition, in particular a cosmetic composition comprising, in a physiologically acceptable medium, at least one compound comprising two or more more than two thiol groups, and at least one photoactive compound - an optional rinsing step for example with water - an optional exposure time - a step of exposing the skin to light radiation, preferably for at least 5 seconds. This step can be repeated several times during the day. It is possible to perform the step of exposing the treated surface to light radiation after or at the same time (simultaneously) as the step of applying the particular cosmetic composition containing a compound comprising two or more thiol groups. , and at least one photoactive compound. Preferably, in a first step, the cosmetic composition according to the invention is applied to the skin, and then, in a second step, the skin is exposed to light radiation. According to this step of the process, it is possible to apply 0.1 to 100 mg of cosmetic composition comprising the thio compound and a photoactive compound, in particular 1 to 50 mg of composition, per cm 2 of skin. As mentioned above, the light radiation may be natural light (daylight) or emitted by a device such as arc lamps such as xenon lamps and mercury lamps, fluorescent lamps, fluorescent lamps incandescent such as halogens, LEDs and lasers. The duration of exposure to the light radiation of the skin treated and provided by a device is preferably at least 5 seconds, preferably this exposure time can range from 10 seconds to 15 minutes, in particular between 15 seconds and 10 minutes, even better between 20 seconds and 5 minutes, regardless of the order of the steps (one before the other or simultaneous).

By way of example, in the case of simultaneous application of the light radiation provided by a device and of the composition comprising a compound comprising two or more thiol groups, and at least one photoactive compound, the duration of exposure to the light can advantageously go from 5 seconds to 15 minutes. It is possible to rinse the composition, but this is not mandatory. For example, in case of application of the composition according to the invention, and then exposure to light radiation provided by a device, the duration of exposure to light may advantageously be between 5 seconds and 15 minutes. It is possible to leave the composition according to the invention for a period of 1 second to 3 hours, before proceeding to the step of applying the light radiation. It is possible to rinse the composition after the step of exposure to light radiation, but this is not mandatory.

The duration of exposure of the treated skin in the light of day as light radiation is preferably at least 3 minutes, preferably this exposure time can range from 3 minutes to 12 hours, in particular between 5 minutes and 90 minutes. even better between 10 minutes and 30 minutes, regardless of the order of the steps (one before the other or simultaneous). By way of example, in the case of simultaneous application of daylight and of the composition comprising a compound comprising two or more thiol groups, and at least one photoactive compound, the duration of exposure to light may advantageously go from 3 minutes to 12 hours. It is possible to rinse the composition, but this is not mandatory. By way of example, in the case of application of the composition, a compound comprising two or more thiol groups, and at least one photoactive compound, then exposure to daylight, the duration of exposure to light. may advantageously be between 3 minutes to 12 hours. It is possible to leave the composition according to the invention for a period of 1 second to 3 hours, before proceeding to the step of exposure to light radiation. It is possible to rinse the composition after the step of exposure to light radiation, but this is not mandatory. Examples: On artificial skins Bioskin® Plate 20 (Reference K278, supplier Medresos, France) was added 20 microliters / cm 2 of a composition of artificial sebum known to be shiny of the following composition (amounts in percent by weight Oleic acid 60% Oleyl oleate 20% Cholesterol oleate 1% Cholesterol 3% Squalene 16% The sebum composition was spread on the artificial skin and allowed to diffuse for 5 minutes at room temperature. 10 microliters / cm 2 of a test composition were then spread on the skin area impregnated with sebum. Test Thiol Compounds - No.1: Pentaerythritol tetrakis (3-mercaptopropionate). - No.2: Polymer connected polyethyleneimine of average molecular weight MW = 25000 having 125 SH functions on average per unit (example 2 of patent FR2772771). 20 - No.3: Sunsphere® 5pm silica particles functionalized with 3-mercaptopropyltriethoxysilane. Compound No.3 (Sunsphere® 5pm silica particles functionalized with 3-mercaptopropyltriethoxysilane) was manufactured according to the following method: in a three-necked refrigerant bearing thermometer, microspheres of amorphous silica (particle size: 5 microns; 6g), toluene (200mL) and 3-mercaptopropyltriethoxysilane (0.6g). The reaction mixture is heated at reflux for 8 hours with stirring and then allowed to cool overnight before being centrifuged at 4000 rpm for 4 minutes. The precipitate obtained is isolated, washed with ethanol (200 ml) and then centrifuged. The precipitate obtained is isolated and then dried under vacuum at 80 ° C. for 24 hours. Sunsphere® particles of 5 μm silica functionalized with 3-mercaptopropyltriethoxysilane are thus obtained in the form of a white powder (0.6 g). Photoactive compound - 2-Hydroxy-4 '- (2-hydroxyethoxy) -2-methylpropiophenone. Solvent - Poly (ethylene glycol) 400. The following compositions were tested. Ingredients Polythiol compounds Exposure to light Exempt 1 2 3 compound Solvent Series 1 Series 2 e photoactiv 1 yes 5 2 no 3 20pL yes 4 20pL no 3pg yes 6 3pg no 7 3pg 20pL yes 8 3pg 20pL no 9 10pL yes 10pL no 11 (inv) 10pL 3pg yes 12 10pL 3pg no 13 (inv) 10pL 3pg 20pL yes 14 10pL 3pg 20pL no 10pg yes 16 10pg no 17 (inv) 10pg 3pg yes 18 10pg 3pg no 19 (inv) 10pg 3pg 20pL yes 10pg 3pg 20pL no 21 10p yes g 22 10p no g 23 (inv) 1 0p 3pg yes g 24 10p 3pg no g (inv) 10p 3pg 20pL yes g 26 10p 3pg 20pL no 27 20pL yes 28 20pL no 29 3pg yes 3pg no 31 3pg 20pL yes 32 3pg 20pL no 33 10pL yes 34 10pL no (inv) 10pL 3pg yes 36 10pL 3pg no 37 (inv) 10pL 3pg 20pL yes 38 10pL 3pg 20pL no Series 1 to 26: For odd examples, after the application of the composition the skin was exposed to sunlight for 1 hour. The irradiation dose received for one hour is equal to 20 J / cm 2 (measured with a UV Integrator device from UV-Design).

For even examples, the skins were not exposed to light and were covered with aluminum foil and left exposed skin. Series 27 to 38: The light source used is a Xenon lamp (reference OMNI300 from the company LOT-ORIEL) coupled to a computer and a monochromator. This equipment makes it possible to select a wavelength and to irradiate a surface by means of a light guide. The guide is located at a distance of about 1cm from Bioskin (artificial skin). The characteristics for this study are: 430nm wavelength, light power measured at the surface of the Bioskin is 18.3 mW / cm2, the irradiation time is 5 minutes giving a radiation dose received on the surface of 5490mJ / cm2. Evaluation of the shine At the end of the experiment, the appearance of the sebum film on the skin is noted and in particular the shine of the skin by looking at the skin at a distance of about 30 cm and an angle of about 45 cm. °. a score between 0 and 10 is assigned to each example: a score of 10 represents a shiny appearance and a score of 0 represents a matte (non-shiny) appearance. The reference for a score of 10 is Example 1 before exposure to light. The reference for a score of 0 is the bare artificial skin (without application of sebum or other ingredients). Results Example Score (0 to 10) - strength 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 10 10 11 4 12 10 13 2 14 10 15 10 16 10 17 6 18 10 19 4 20 1 2 1 2 3 1 2 3 1 2 3 4 5 6 7 10 9 10 9 10 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 10 9 10 9 9 9 9 10 1 2 3 irradiated (examples with even numbers between 1 and 26) there is no change in the smoothness of the skin by comparison of the shine before storing away from light for 1 hour and compared to the EXAMPLE 1 For the irradiated examples containing only the polythiol compounds 10 (Examples 9, 15 or 21) there is no decrease in gloss compared to the examples (Examples 10, 16 or 22) not irradiated and using the same compounds and by comparison with Example 1. For Example 5, irradiated and containing only one initiator, there is no decrease in gloss compared to Example 6 ( non-irradiated) and compared to Example 1. For Example 3, irradiated and containing only one solvent, there was no decrease in gloss compared to Example 4 (non-irradiated) and compared to Example 1. For Examples containing a polythiol compound and the photoactive compound according to the invention (Examples 11, 17 & 23), there is a decrease in gloss compared to non-irradiated examples (Examples 12, 18 & 24), and using the same thiol compounds and the photoactive compound and also compared to Example 1. For the examples containing a polythiol compound, a photoactive compound and a solvent (Examples 13, 19, 25) there is a greater decrease in gloss. to the non-irradiated examples (Examples 14, 20, 26) and using the same polythiol compounds, the photoactive compound and the solvent and also by comparison to Example 1.

Series 2 (Examples 27 to 38) For the examples containing a polythiol compound, the initiator and with or without a solvent there is a greater decrease in gloss on exposure to light (Examples 35, 37) compared to non-polar examples. -radiated (Examples 36, 38) and also by comparison with Examples 27 to 34.

Conclusions It can be concluded that a composition containing a polythiol compound and a photoactive compound and with the action of light radiation makes it possible to matify the shiny skin.

Claims (36)

REVENDICATIONS1. A cosmetic process for mattifying oily skin comprising: - a step of applying to the oily skin a cosmetic composition comprising, in a physiologically acceptable medium, at least one compound comprising two or more thiol groups, and at least one photoactive compound a step of exposing the skin to light radiation, preferably for at least 5 seconds. 10 2. Method according to the preceding claim, wherein the compound comprising two or more thiol groups is chosen from, alone or as a mixture: a nonpolymeric organic compound and can be represented by the formula (I) W (SH) n (I) wherein n denotes an integer greater than or equal to 2, preferably between 2 and 10, preferably between 2 and 5. 20 and W denotes a linear or branched C2-C80 (at least divalent) multivalent radical or (hetero) cyclic, saturated, an aromatic radical, a heteroaromatic cyclic radical, W may also contain one or more heteroatoms such as O, N, S, and / or one or more functions chosen from ester, ketone, amide functions, ureas, preferably esters, ketones) and / or be substituted with one or more linear or branched C1-C10 alkyl groups, linear or branched C1-C10 alkoxy, it being understood that when the radical W is substituted, the thio functions They can be carried by the substituent (s), a polymeric compound and can be represented by the formula (II) POL (SH) n (II) in which n denotes an integer greater than or equal to 5, preferably between 5 and 5000, and POL denotes a multivalent (at least pentavalent) polymeric radical, carbon or silicone, which POL may additionally contain one or more heteroatoms such as O, N, S, and / or one or more selected functions. among the functions esters, ketones, amides, ureas, carbamates, and / or be substituted by one or more linear or branched C1-C10 alkyl groups, linear C1-C10 alkoxy or branched 40, it being understood that when POL is substituted, the functions thiols may be carried by the substituent (s). a particle bearing two or more thiol groups (silica functionalized with radicals, for example of the alkyl type, substituted with thiol functions) or a particle coated with compound (s) carrying two or more thiol functional groups (coating ) said particle may be a sphere, a fiber, a rod, an amorphous structure. 3. Method according to one of the preceding claims, wherein the compound comprising two or more thiol groups is selected from a compound of formula (I) such that n = 2 and W denotes a linear divalent hydrocarbon radical C2-C20 linear or branched, preferably C2-C12. 4. Method according to the preceding claim, wherein the compound comprising two or more thiol groups is selected from - 1,2-ethanedithiol, 1,2-propanedithiol, 1,3-propanedithiol, 1,4- butanedithiol, 1,6-hexanedithiol, 1,7-heptanedithiol, 1,8-octanedithiol, 1,9-nonanedithiol, 1,10-decanedithiol, 1,12-dodecanedithiol, 2,2-dimethyl 1,3-propanedithiol, 3-methyl-1,5-pentanedithiol, 2-methyl-1,8-octanedithiol, 5. Process according to one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (I) such that n = 3 and W denotes a linear C3-C20 saturated hydrocarbon saturated radical. or branched, preferably C2-C12 linear or branched. 6. Method according to the preceding claim, wherein the compound comprising two or more thiol groups is selected from 1,1,120 tris (mercaptomethyl) ethane, 2-ethyl-2-mercaptomethyl-1,3-propanedithiol, 1 , 2,3-propanetrithiol. 7. Process according to one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (I) such that such n = 2 or 3 and W denotes a divalent radical or linear or branched, preferably C2-C12 linear or branched C3-C20 saturated hydrocarbon saturated, said radical containing one or more non-adjacent heteroatom (s) chosen from O, S. 8. Process according to the preceding claim, in which the compound comprising two or more thiol groups is chosen from bis (2-mercaptoethyl) ether bis (2-mercaptoethyl) ether bis (2-mercaptoalkyl) ethers and sulfides. mercaptoethyl) sulfide, bis- (2-mercaptoethylthio-3-mercaptopropane) sulfide o (C 1 -C 5) alkanes bis (2-mercapto (C 1 -C 3) alkyl) thio or mercaptoalkanes (C 1 -C 5) bis (2-mercapto) alkyl (C1-C3) thio), such as, for example, bis (2-mercaptoethylthio) methane, 1,2-bis (2-mercaptoethylthio) ethane, 1,3-bis (2-mercaptoethylthio) propane, 1,2-bis (2-mercaptoethylthio) ethane, bis (2-mercaptoethylthio) propanethiol, 1,2-bis (2-mercaptoethyl) thio-3-mercaptopropane, 1,2,3-tris (2-mercaptoethylthio) propane, and is preferably selected from the group consisting of 1,2-bis (2-mercaptoethylthio) propanethiol, 1,2,3-tris (2-mercaptoethylthio) propane, tetrakis (2-mercaptoethylthiomethyl) methane. 9. Process according to one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (I) such that n denotes an integer greater than or equal to 2 and W denotes a multivalent radical. (at least divalent) C3-C20 linear or branched, preferably C2-C12 linear or branched, saturated hydrocarbon radical, said radical containing at least one ester function. 10. Process according to the preceding claim, in which the compound comprising two or more thiol groups is chosen from esters of polyols (glycols, triols, tetraols, pentaols, hexaols) and of C 1 -C 6 mercaptocarboxylic acid such as ethylene glycol bis (2-mercaptoacetate), ethylene glycol bis (3-mercaptopropionate), ethylene glycol bis (thioglycolate), trimethylolpropane tris (thioglycolate), trimethylolpropane tris (beta- mercaptopropionate), pentaerythritol tetrakis (thioglycolate) pentaerythritol tetrakis (.beta.-mercaptopropionate), dipentaerylthritol hexakis (.beta.-mercaptoproprionate), trimethylolpropane tris (2-mercaptoacetate), trimethyllopropane tris (3-mercaptopropionate), pentaerythritol tetrakis (2-mercaptoacetate) ), pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptobutanate), dipentaerythritol hex-3-mercaptopropionate. 11. Process according to one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (I) such that n = 4 and W denotes a C4-C20 saturated hydrocarbon tetravalent radical, preferably branched C8-C14, interrupted by one or more non-adjacent sulfur atoms, 12. Method according to the preceding claim, wherein the compound comprising two or more thiol groups is selected from tetrakis (2-mercaptoethylthiomethyl) methane, bis- (2-mercaptoethylthio-3-mercaptopropane) sulfide. 13. Process according to one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (I) such that n = 2 and W denotes a divalent cyclic hydrocarbon radical optionally containing one or several non-adjacent sulfur atoms, optionally substituted by one or more linear or branched C1-C10 alkyl radicals. 14. Process according to the preceding claim, in which the compound comprising two or more thiol groups is chosen from 1,4-cyclohexane dithiol, 1,4-bis (mercaptomethyl) cyclohexane and 1,1-cyclohexane. dithiol, 1,2-cyclohexane dithiol, 1,1-bis (mercaptomethyl) cyclohexane, 2,5-dimercapto-1,4-dithiane. 15. Process according to one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (I) such that n = 3 and W denotes a cyclic radical of substituted isocyanurate type. 16. The process according to the preceding claim, wherein the compound comprising two or more thiol groups is chosen from tris ((mercaptopropionyloxy) -ethyl) isocyanurate. 17. Process according to one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (I) such that n = 2 or 3 or 4 and W denotes an optionally substituted aromatic radical. by one or more identical or different radicals of alkyl type C1-C10, C1-C10 alkoxy, it being understood that when the radical W is substituted, the thiol functions may be borne by the substituent (s). 18. The method according to the preceding claim, wherein the compound comprising two or more thiol groups is chosen from 1,2-dimercaptobenzene, 1,3-dimercaptobenzene, 1,4-dimercaptobenzene, 1,2-bis ( mercaptomethyl) benzene, 1,3-bis (mercaptomethyl) benzene, 1,4-bis (mercaptomethyl) benzene, 1,2-bis (2-mercaptoethyl) benzene, 1,3-bis (2-mercaptoethyl) benzene, 1,4-bis (2-mercaptoethyl) benzene, 1,2-bis (2-mercaptoethyleneoxy) benzene, 1,3-bis (2-mercaptoethyleneoxy) benzene, 1,4-bis (2- mercaptoethyleneoxy) benzene, 1,2,3-trimercaptobenzene, 1,2,4-trimercaptobenzene, 1,3,5-trimercaptobenzene, 1,2,3-tris (mercaptomethyl) benzene, 1,2,4-trimercaptobenzene tri (mercaptomethyl) benzene, 1,3,5-tris (mercaptomethyl) benzene, 1,2,3-tris (2-mercaptoethyl) benzene, 1,2,4-tris (2-mercaptoethyl) benzene, 1,3,5-tris (2-mercaptoethyl) benzene, 1,2,3-tris (2-mercaptoethyleneoxy) benzene, 1,2,4-tris (2-mercaptoethyleneoxy) benzene, 1,3, 5-tris (2-mercaptoethyleneox y) benzene, 1,2,3,4-tetramercaptobenzene, 1,2,3,5-tetramercaptobenzene, 1,2,4,5-tetramercaptobenzene, 1,2,3,4-tetrakis (mercaptomethyl) benzene, 1,2,3,5-tetrakis (mercaptomethyl) benzene, 1,2,4,5-tetrakis (mercaptomethyl) benzene, 1,2,3,4-tetrakis (2-mercaptoethyl) benzene, 1,2,3,5-tetrakis (2-mercaptoethyl) benzene, 1,2,4,5-tetrakis (2-mercaptoethyl) benzene, 1,2,3,4-tetrakis (2-mercaptoethyleneoxy) benzene, 1,2,3,5-tetrakis (2-mercaptoethyleneoxy) benzene, 1,2,4,5-tetrakis (2-mercaptoethyleneoxy) benzene, 2,2'-dimercaptobiphenyl, 4,4'-dimercaptobiphenyl, 4,4'-dimercaptobibenzyl, 2,5-toluenedithiol, 3,4-toluenedithiol, 1,4-naphthalenedithiol, 1,5-naphthalenedithiol, 2,6-naphthalenedithiol, 2,7-naphthalenedithiol, 2,4-dimethylbenzene-1,3-dithiol, 4,5-dimethylbenzene-1,3-dithiol, 9,10-anthracenedimethanethiol, 1,3-bis (2-mercaptoethylthio) benzene, 1,4 bis (2-mercaptoethylthio) benzene, 1,2-bis (2-mercaptoethylthiomethyl) benzene, 1,3-bis (2-mercaptoethylthiomethyl) benzene, 1,4-bis (2-mercaptoethylthiomethyl) benzene, 1,2,3-tris (2-mercaptoethylthio) benzene, 1,2,4-tris ( 2-mercaptoethylthio) benzene, 1,3,5-tris (2-mercaptoethylthio) benzene, 1,2,3,4-tetrakis (2-mercaptoethylthio) benzene, 1,2,3,5-tetrakis (2-mercaptoethylthio) benzene, -mercaptoethylthio) benzene, 1,2,4,5-tetrakis (2-mercaptoethylthio) benzene, 3,4-thiophenedithiol. 19. The process as claimed in one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (I) such that n = 2 or 3 or 4 and W denotes an acid triglyceride. optionally substituted, it being understood that when the radical W is substituted, the thiol functions may be carried by the substituent (s). 20. Process according to the preceding claim, in which the compound comprising two or more thiol groups is chosen from fatty acid triglycerides or vegetable oils modified by thiol groups by chemical reaction, such as, for example, thiolated soybean oils and soybean and thiolated oils. 21. Method according to one of the preceding claims, wherein the compound comprising two or more thiol groups is chosen from a compound of formula (II) in which POL denotes a polymeric hydrocarbon radical) such as for example poly (vinyl mercaptan). ), poly (4-mercaptostyrene), poly (vinylbenzylmercaptan), poly (4-mercaptostyrene) -co-poly (methylmethacrylate), as well as polymers containing amide functions in the polymer such as poly (hexamethylene adipamide) thiole). 22. Method according to one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from proteins and peptides with thiol units, for example the structures represented in the following table (CH2CH). CH 2 CH 3 CH 2 CH 3 CH 2 CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 SH 2 CH 2 CH 2 CH 2 CH 2 CH 2 (CH2) 8-NG --- (CH2) 4- C- -C-CH- (CH2) 2-CH-C-NH- (CH2) G-NH- 1} {2 cH2 - ii 1 SH 1 SH ## STR5 ## ## STR2 ## ## STR2 ## ## STR2 ## ## STR13 ## HSCH-CONH-Protein HS-CH2-CONH IProtein CH2-COOH / HS-CH2-CONH HSCH2CH2CH-NH-Protein NH COCH3 23. The process as claimed in one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (II) in which POL denotes a radical known as dendrimer, polymer which is ramified or hyperbranched and the thiol groups are terminal. 24. The process as claimed in one of the preceding claims, in which the compound comprising two or more thiol groups is chosen from a compound of formula (II) in which POL denotes a polymeric silicone radical. 25. Method according to one of the preceding claims, wherein the compound comprising two or more thiol groups is a particle carrying two or more thiol groups (silica functionalized with radicals, for example of alkyl type, substituted by thiol functions). 26. The method according to one of the preceding claims, wherein the compound comprising two or more thiol groups is a particle bearing two or more thiol moieties polythiol particles in latex form. 27. Method according to one of the preceding claims, wherein the compound comprising two or more thiol groups is a coated particle of compound (s) carrying two or more thiol functions. 28. Process according to one of the preceding claims, in which the compound comprising two or more thiol groups, alone or as a mixture, is present in the composition, in an amount ranging from 0.001% to 95% by weight, relative to total weight of the composition, preferably ranging from 0.01% to 50% by weight, preferably ranging from 0.5 to 10% by weight, more preferably ranging from 0.1 to 5% by weight. 29. Process according to one of the preceding claims, in which the photoactive compound is chosen from the compounds of formula (VI), (VII), (VIII) or (IX), as well as their salts of organic or inorganic acid, their optical isomers, geometers, tautomers and their solvates such as hydrates: 3 XL R ', 3 R' Ra Rb R2 R 1 .. 1 + Rd to x R1 Metal (L ') q Y Rc X An-R "R" 1 (VI) (VII) (VIII) (IX) Formula (VI), (VII), (VIII) or (IX) in which: - R represents a group chosen from: i) (Ci-Cio) alkyl, optionally substituted, preferably with one or more atoms or groups selected from halogen, hydroxy, (Ci-Cio) alkoxy, (hetero) cycloalkyl comprising between 5 and 10 members such as morpholinyl, and amino RaRbN- with Ra, Rb, which may be identical or different, representing a hydrogen atom or a (Ci-Cio) alkyl group or else Ra and Rb together with the nitrogen atom carrying them form a heteroaryl or heterocycloalkyl group such as morpholino ; ii) (C1-C10) alkoxy optionally substituted, preferably by the same substituents as for i) (C1-C10) alkyl; iii) hydroxy; iv) optionally substituted hetero) aryl such as optionally substituted phenyl of formula (X) R 'with R'1, R'2, R'3, same or different, being as defined for R1, R2, R3 and representing the point of attachment to the rest of the molecule; y) (hetero) cycloalkyl optionally substituted preferably with a hydroxy group; R'3 30152 4 3 39 vi) R4- (X) ,, - C (X) - (X), -, - with R4 representing an optionally substituted (C1-C10) alkyl group, (hetero) aryl optionally substituted such that optionally substituted phenyl of formula (X), (hetero) cycloalkyl optionally substituted, n and n ', identical or different, ranging 0 or 1; (Vii) RCRdP (X) - with R, representing optionally substituted (C1-C10) alkyl, or (hetero) aryl optionally substituted, and Rd representing an optionally substituted (hetero) aryl group; viii) or else R1 with R in ortho of the group C (X) -R or R "and R" 1 in ortho of the group R'-Y + -R "together with the atoms which carry them a (hetero) ring fused to phenyl or (hetero) aryl fused to phenyl optionally substituted especially on non-aromatic part by one or more oxo group, or thiooxo, preferably R1 with R in ortho group C (X) -R together with the atoms which carry them and the phenyl ring fused an anthraquinone group (XI): (XI) - R1, R2 or R3, identical or different, represent a i) hydrogen atom, ii) halogen such as chlorine, iii) a optionally substituted (C1-C10) alkyl group, (iv) (C1-C10) alkoxy optionally substituted, in particular with an optionally substituted hydroxy, y) (hetero) aryl group, vi) (hetero) cycloalkyl optionally substituted, vii) carboxy, viii ) cyano, ix) nitro, x) nitroso, xi) -S (O) p-OM with p valant 1 or 2, M representing a hydrogen atom, a metal a alkaline or alkaline earth metal, xii) R4R5N-; xiii) R4- (X), -C (X) - (X), - with R4, n and n 'as defined above, R5 is as defined for R4 or R4 and R5 together with the atom of nitrogen which carries them a heterocycloalkyl or optionally substituted heteroaryl such as morpholino, identical or different, ranging 0 or 1, xiv) hydroxy, or xv) thiol; - R "1, R" 2 or R "3, identical or different, are as defined for R1, R2, R3, preferably are chosen from hydrogen or R4-Y - with R4 being as defined previously and preferably a phenyl group - or else R and R1 contiguous, together with the carbon atoms which carry them, form an optionally unsaturated and optionally substituted (hetero) cycloalkyl group, preferably optionally substituted cycloalkyl, and in particular by a or more oxo group and / or optionally fused with an aryl group such as benzo; or two contiguous substituents R1, R2 and / or R'1, R'2 together form a group derived from maleic anydryde such as -C ( X) -XC (X) -X, which may be identical or different, represents an oxygen atom, a sulfur atom or an NR5 group with R5 as defined above, preferably representing a hydrogen atom or a group C10) alkyl, more particularly X represents an oxygen atom; Y is as defined for X, preferably Y represents a sulfur atom; Metal represents a transition metal such as iron or chromium, preferably Fe, said metal being cationic in which case the photoactive compound of formula (XVIII) comprises an anionic counterion number An "as defined above, to achieve the electroneutrality of the molecule; - L and L ', identical or different, representing a transition metal ligand preferably selected from the following electron donors C (X) with X as defined above , optionally substituted cyano CN, (Ci-C6) alkenyl, (hetero) aryl such as bipyridinyl, amines such as amines R4R5R6N with R4 and R5 as defined above and R6 representing a hydrogen atom, or a group as defined for R4, phosphine R4R5R6P such that tri (hetero) arylphosphine, (hetero) cycloalkyl is preferably unsaturated such as cyclopentadiene, carbene such as arduengo carbene, q representing an integer inclusive inc advantageously between 1 and 6, making it possible to achieve the stability of the metal complex i.e. so as to obtain a number of electrons around the metal equal to 16 or 18 electrons (it is also referred to as a 16 or 18 electron coordination sphere); R 'and R ", which may be identical or different, represent an optionally substituted (hetero) aryl group; An" represents an anionic counterion as defined above preferably chosen from (1-1a1) 613-' or (1-1a1) 6SID- 'with Hal, identical or different, representing a halogen atom such as fluorine; and Ra, Rb, Rc or Rd, which may be identical or different, represent a hydrogen atom or a (Ci-Cio) alkyl group. 30. Method according to one of the preceding claims, wherein the ooactive compound is selected from the following compounds: CAS designation No. Poly (ethylene glycol) bis (p-dimethylaminobenzoate) 0071512-90-8 144- (2-Hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propan-1-one 0106797-53-9 1-Butanone, 2- (dimethylamino) -144- (4-morpholinyl) phenyl] -2- 0119313-12-1 (phenylmethyl) - Phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide 0162881-26-7 Benzene, (1-methylethenyl) -, homopolymer, ar- (2-hydroxy-2-methyl-1-oxopropyl) derivs. 0163702-01-0 2-Hydroxy-4 '- (2-hydroxyethoxy) -2-methylpropiophenone Oxy-phenyl-acetic acid 2- [2-oxo-2-phenyl-acetoxyethoxy] ethyl ester 0211510-16- Oxy-phenyl-acetic 2- [2-hydroxy-ethoxy] -ethyl ester 0442536-99-4 Poly [oxy (methyl-12-ethanyl)], alpha- [4- (dimethylamino) benzoyl-omega-butoxy] 0223463-45-4 2-Hydroxy-1- (4- (4- (2-hydroxy-2- [0474510-57-1 methylpropionyl] benzyl) phenyl-2-methyl-2-propanone 4- (2-hydroxyethoxy) phenyl - (2-hydroxy-2-propyl) ketone 0106797-53-9 d, 1-Camphorquinone 0010373-78-1 2,2-Dimethoxy-2-phenylacetophenone 0024650-42-8 1-Propanone, 144- (1,1 dimethylethyl) phenyl] -2-hydroxy-2-methyl- 0068400-54-4 1-Propanone, 2-methyl-1 - [(4-methylthio) phenyl] -2- (4-morpholinyl) -0071868-10- 4,4'-Bis (methylethylamino) benzophenone 0194655-98-6 {α-4- (Dimethylamino) benzoylpoly (oxyethylene) -poly [oxy (1-methylethylene)] - poly (oxyethylene)} 4- (dimethylamino) benzoate 1003557-17-2 1,3-Di ({a-2- (phenylcarbonyl) benzoylpoly [oxy (1-methylethylene)]} oxy) -2,2-bis ({a-2- (phenylcarbonyl) benzoylpol) y [oxy (1-methylethylene)]} oxymethyl) propane 1003567-82-5 1,3-Di ({4- (dimethylamino) benzoylpoly [oxy (1-methylethylene)]} oxy) -2,2-bis ( {4- (dimethylamino) benzoylpoly [oxy (1-methylethylene)]} oxymethyl) propane 1003567-84-7 Poly (oxy-1,2-ethanediyl), a- [2- (4-chlorobenzoyl) benzoyl] - N - [[2- (4-chlorobenzoyl) benzoyl] oxy] 1007306-69-5 2-Hydroxy- [4 '- (2-hydroxypropoxy) phenyl] -2-methylpropanone Polyethylene glycol (200) di (p-4) [p-acetylphenyl] piperazine) propionate Polyethylene glycol (200) di (p-4 [4- (2-dimethylamino-2-benzyl) butanoylphenyl] piperazine) propionate 31. The process according to any one of the preceding claims, wherein the photoactive compound is 2-hydroxy-4 '- (2-hydroxyethoxy) -2-methylpropiophenone. The process according to any one of the preceding claims, wherein the photoactive compound (or mixture of photoactive compounds) is present in the composition, in an amount of from 0.001% to 20% by weight, based on the total weight of the composition, preferably from 0.01% to 10% by weight, preferably from 0.05 to 5% by weight, more preferably from 0.1 to 3% by weight. The method according to any of the preceding claims, wherein the step of applying light radiation is performed after or at the same time (simultaneously) as the step of applying the cosmetic composition comprising the polythiol compound and the compound photoactive. 34. Non-therapeutic cosmetic process for the treatment of keratin materials, comprising the application to the keratin materials of a cosmetic composition according to any one of Claims 1 to 32, then the exposure of the deposit formed on the keratin materials to natural light. or artificial light of wavelength between 360 and 600 nm. 35. The method according to one of the preceding claims, wherein the light radiation has a source selected from arc lamps such as xenon lamps and mercury lamps; fluorescent lamps; incandescent lamps such as halogens, LEDs and lasers. 36. Method according to the preceding claim, wherein the duration of exposure to light radiation is at least 5 seconds, preferably this exposure time can range from 10 seconds to 15 minutes, in particular between 15 seconds and 10 minutes, even better between 20 seconds and 5 minutes, regardless of the order of the steps (one before the other or simultaneous).