FR3116725A1 - MASK COMPOSITION AND PROCESS - Google Patents

Abstract

MASK COMPOSITION AND PROCESS The present invention relates to a mask for the care of keratinous materials, comprising: (1) at least one hydrogel layer(s); (2) at least one of the fiber-based layer(s), wherein at least one fiber-based layer is the layer that is closer to the keratinous materials than the hydrogel layer(s) present in the mask. The present invention relates to a preparation process thereof and its uses. Figure for abstract: figure 1

Description

MASK COMPOSITION AND PROCESS

FIELD OF THE INVENTION

The present invention relates to a mask composition for topical application which comprises a water-insoluble substrate, including a composition providing a functional benefit to the skin. Furthermore, the present invention relates to the corresponding non-therapeutic process involving the use of the same mask.

BACKGROUND OF THE INVENTION

A sheet which is formed by a substrate sheet such as a non-woven fabric sheet impregnated with a lotion or the like is used for cosmetic treatments of the skin, particularly the face. Such masks for cosmetic treatment are disclosed, for example in patent application WO 02/062132, which provides the skin with an acute benefit of modifying the complexion.

It is also known to use active ingredients in cosmetic products to treat or care for the skin, such as hydration, whitening, anti-aging, pore minimization, freshness, smoothness, softness, etc. Among these, the skin conditioning effect such as moisturizing is always of interest to consumers around the world. Cosmetic masks impregnated with lotion containing skin conditioning agents can be applied to the skin to provide, in particular, a moisturizing effect. To meet this demand, various masks have been developed.

In addition to activity agents, the mask support is an important part. Currently, the general mask products on the market are divided into two types: one uses non-woven type fabric sheet, the other uses gel type sheet.

The disadvantage of a mask made of a fiber-like sheet is that it can only contain or load a limited quantity of a functional liquid whose activity agent(s), the ) activity agent(s) included in the fiber-like sheet being directly exposed to air. Therefore, the application time of the mask made of a fiber-like sheet is limited to a short period because the activity agent(s) included in the fiber-like sheet volatilizes or dries in a short time. Such a mask made of a fiber-like sheet cannot fail to have continuous effects on the skin. In addition, the mask made of fiber type sheet has sufficient moisture at the beginning of its use, which causes the skin to absorb too much water; then, when the mask made of dry fiber type sheet, the mask made of fiber type sheet will absorb water from the skin conversely, which will make the skin feel uncomfortable, such as stretching it.

The downside to a gel sheet mask is that, as the gel sheet is normally used as a backing material, it must be used in conjunction with fluid formulas; otherwise, no cosmetic efficacy can be brought to the skin. In other words, the mask made of a sheet of gel does not allow a good supply of active ingredients to the skin, even with the filling of a functional liquid including one or more active agents.

However, the masks to date still need to be improved, especially in terms of long-term active effects with potency agents in large quantities.

Based on the above, there is a need for a mask that is effective in delivering skin conditioning actives to skin with high amounts of actives during long term application. In particular, there is a need for a mask with a high loading of actives (for example, providing the skin with a good conditioning benefit, in particular hydration, freshness, smoothness and softness, etc.), and in the same time, excellent delivery capacity when applied to the skin.

DISCLOSURE OF INVENTION

An object of the present invention is to provide a novel solid hydrogel sheet mask with a high amount of active loading and excellent delivery capacity. This mask is effective in delivering skin conditioning actives to the skin with high amounts of actives during long term application.

The above object of the present invention can be achieved by a mask comprising at least

(1) fiber-based layer(s) as defined in the present invention;

(2) a hydrogel layer(s) as defined in the present invention, which is (are) in contact with the fiber-based layer, optionally comprising an agent(s) assets) ;

wherein at least one fiber-based layer is the layer which is closer to the keratinous materials after application than any hydrogel layer(s) present in the mask.

Another aspect of the present invention is to provide a mask preparation process, comprising the steps of:

- supply of a fiber-based layer;

- supply of a hydrogel layer comprising active agent(s),

- coating of the fiber-based layer on the hydrogel layer.

Another aspect of the present invention consists in providing a dressing for skin wounds, comprising at least:

(1) fiber-based layer(s) as defined in the present invention;

(2) a layer(s) of hydrogel as defined in the present invention, which is (are) in contact with the fiber-based layer, optionally comprising an active agent(s) );

wherein at least one fiber-based layer is the layer which is closer to the keratinous materials than the (all) hydrogel layer(s) present.

These and other features, aspects and advantages of the present invention will be better understood upon reading the following description and the claims.

Preferably, the "keratinous material" according to the present invention is the skin. By "skin" is meant all the skin of the body, including the scalp. Preferably again, the keratinous material is the face, or the neck, in particular the face.

By “topical application”, is meant that the composition is applied or spread on the surface of the keratinous material, such as the skin.

DETAILED DESCRIPTION OF THE INVENTION

In what follows and unless otherwise indicated, the limits of a range of values are included in this range, in particular in the expressions "between ... and" and "from ... to ...".

The terms "a", "an", "the", "the", and "the" are understood to include the plural as well as the singular.

The term “at least one” means “one or more” and vice versa, and therefore includes individual components as well as mixtures/combinations.

The term "approximately", when referring to a value, specifically means that a measurement may be rounded to the value using a standard convention for rounding numbers. For example, "about 1.5" means between 1.45 and 1.54. All values given here may be modified by the term "approximately", if it is desired to give them the above meaning, or be quoted without this term, whether the term "approximately" is specifically stated (or it is absent) in conjunction with a particular value in the specification.

According to the present invention, the mask comprises a mask for the care of keratinous materials, comprising at least:

(1) fiber-based layer(s) as defined in the present invention;

(2) hydrogel layer(s) as defined in the present invention, which is (are) in contact with the fiber-based layer, optionally comprising active ingredient(s);

wherein at least one fiber-based layer is the layer which is closer to the keratinous materials than the (all) hydrogel layer(s) present in the mask.

Hydrogel layer

The hydrogel layer used in this mask is an insoluble solid hydrogel layer, in which active ingredients are optionally added. In general, all kinds of insoluble solid hydrogel layers comprising at least one cosmetically acceptable water-soluble alkali metal salt can be used in the present invention.

The hydrogel layer is prepared by the following substances including water, a gelling composition and at least one water-soluble alkali metal salt.

Co m gelling position

According to one aspect, the gelling composition according to the present invention comprises at least one hydrophilic thickener (also known as an aqueous-phase thickening polymer).

There is no particular limitation on the hydrophilic thickener. For example, the hydrophilic thickener can be chosen from the following compounds:

1. homopolymers or copolymers of acrylic or methacrylic acid or their salts and esters.

The examples which may be cited in particular include the products sold under the names Versicol F or Versicol K by the company Allied Colloid, Ultrahold 8 by the company Ciba-Geigy, Cosmedia SP by the company BASF, Lecigel (mixture of copolymer of sodium acrylates/lecithin) by the company Lucas Meyer Cosmetics; polyacrylic acids of the Synthalen K type, and salts, in particular sodium salts, of polyacrylic acid (corresponding to the INCI name sodium acrylate copolymer) and more particularly a crosslinked sodium polyacrylate (corresponding to the INCI name sodium acrylate copolymer (and) caprylic /capric triglyceride) sold under the name Luvigel EM.

Mention may also be made of polyacrylic acid/alkyl acrylate copolymers, preferably modified or unmodified carboxyvinyl polymers, most particularly acrylate/C _10-30 alkyl acrylate copolymers (INCI name: Acrylate/C _10-30 Alkyl Acrylate Crosspolymer ) such as the products sold by Lubrizol under the trade names Pemulen TR1, Pemulen TR2, Carbopol 1382, Carbopol EDT 2020 and even more preferably Pemulen TR-2; copolymers of methacrylic acid, methyl methacrylate, methylstyrene isocyanate and PEG-40 behenate (INCI name: polyacrylate-3) (Viscophobe DB 1000 sold by the company Dow),

ii) copolymers of acrylic acid and acrylamide

Mention may be made of those in the form of their sodium salt sold under the names Reten by the company Hercules, the sodium polymethacrylate sold under the name Darvan No. 7 by the company Vanderbilt, and the sodium salts of polyhydroxycarboxylic acids sold under the name Hydagen F by the company Henkel.

(iii) homopolymers and copolymers based on acrylamidopropanesulfonic acid

We can cite for example:

- the polyacrylamidomethylpropanesulfonic acid partially neutralized by aqueous ammonia and highly cross-linked, for example the product Hostacerin AMPS sold in particular by the company Clariant,

- acrylamidopropanesulfonic acid/acrylamide copolymers, for example of the Sepigel or Simulgel type sold in particular by the company SEPPIC,

- polyoxyethylenated acrylamidopropanesulfonic acid/alkyl methacrylate copolymers (crosslinked or not) of the type, among others, Aristoflex HMS and Aristoflex TAC, sold by the company Clariant,

- copolymers of acrylamidomethylpropanesulfonic acid and hydroxyethyl acrylate, for example the copolymer of acrylamidomethylpropanesulfonic acid/hydroxyethyl acrylate, in particular such as the product used in the commercial product sold under the name Simulgel NS by the company SEPPIC, or the acrylamido methylpropanesulfonic acid/hydroxyethyl acrylate copolymer, in particular such as the product used in the commercial product sold under the name Sepinov EMT 10 by the company SEPPIC (INCI name: Hydroxyethyl acrylate/sodium acryloyldimethyl taurate copolymer);

- copolymers of acrylamidomethylpropanesulfonic acid and vinylpyrrolidone, such as the product Aristoflex AVC (copolymer of ammonium acryloyldimethyl taurate and PV in water) sold by the company Clariant; And

- mixtures thereof.

As a variant, the hydrophilic thickener can be chosen from:

- anionic, cationic, amphoteric or nonionic chitin or chitosan polymers;

- Cellulose polymers, in particular (C ₁ -C ₃ )hydroxyalkylcelluloses, chosen from hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxymethylcellulose, ethylhydroxyethylcellulose, carboxymethylcellulose and quaternized derivatives of cellulose;

- vinyl polymers, for example polyvinylpyrrolidones, copolymers of methylvinyl ether and malic anhydride, copolymer of vinyl acetate and crotonic acid, copolymers of vinylpyrrolidone and vinyl acetate; copolymers of vinylpyrrolidone and caprolactam; polyvinyl alcohol,

- optionally modified polymers of natural origin, such as galactomannans and their derivatives, for example carrageenan gum, konjac gum, gellan gum, locust bean gum, fenugreek gum, karaya gum, gum tragacanth, gum arabic, gum acacia, guar gum and its derivatives (carboxymethyl guar, hydroxypropyl guar, hydroxypropyl guar modified with sodium methylcarboxylate groups (Jaguar XC97-1, Rhodia)), xanthan gum and its derivatives;

- alginates and carrageenans, for example carrageenans of the μ, κ, v, ι or λθ type, and mixtures thereof in all proportions, preferably of the κ type;

- mucopolysaccharides such as hyaluronic acid;

- and mixtures thereof.

According to certain embodiments, the thickening polymer is selected from xanthan gum, carrageenan gum, konjac gum, guar gum, hydroxypropyl gum, locust bean gum and carboxymethylcellulose.

According to certain embodiments, the composition according to the present invention comprises carrageenan gum and konjac gum as hydrophilic gums.

According to certain embodiments, the composition according to the present invention comprises xanthan gum and konjac gum as hydrophilic gums.

According to certain embodiments, the composition according to the present invention comprises hydroxypropyl guar as a hydrophilic gum.

In order to increase the resistance of the gel, the composition according to the present invention may additionally comprise a crosslinking agent.

As an example of a crosslinking agent, mention may be made of sodium borate.

According to one embodiment, the composition according to the present invention comprises hydroxypropyl guar as hydrophilic gum and borax as crosslinking agent.

Within the framework of the teaching of the present description, the person skilled in the art can adjust the quantity and/or the type of thickening agent and/or crosslinking agent to obtain the composition according to the present invention.

In certain preferred embodiments, the composition according to the present invention comprises carrageenan gum and konjac gum as hydrophilic gums, the total amount of carrageenan gum and konjac gum is from 0.2% to 10% by weight , based on the total weight of the composition.

In certain preferred embodiments, the composition according to the present invention comprises xanthan gum and konjac gum as hydrophilic gums, the total amount of xanthan gum and konjac gum is from 0.5% to 10% by weight, based on the total weight of the composition.

In certain preferred embodiments, the composition according to the present invention comprises hydroxypropyl guar as hydrophilic gum, the amount of hydroxypropyl guar being from 0.5% to 10% by weight, based on the total weight of the composition.

In certain preferred embodiments, the composition according to the present invention comprises hydroxypropyl guar as hydrophilic gum and borax as crosslinking agent, the amount of hydroxypropyl guar is from 0.5% by weight to 10% by weight, based on the total weight of the composition.

As a commercial carrageenan product, mention may be made of those sold under the names Satiagum UTC 30 Carrageenan lamda Cargill, Satiagum UTC 10 Carrageenan lamda, and Cargill SATIAGEL™ UHD 300 by the company Cargill, under the name CARRAGEENAN BLK120 by the company BLG and under the name KA120LMO by Greenfresh company.

As a commercial product of konjac gum, mention may be made of that sold under the name KONJAC GEL CKAA1220 by the company XieLi, and that sold under the name KONJAC FLOUR HWG1002 by the company BLG.

As a commercial xanthan gum product, mention may be made of that sold under the name KELTROL CG or KELTROL CG-T by the company CP KELCO; and under the name RHODICARE XC by the company PMC OUVRIE.

As a commercial product of hydroxypropyl guar, mention may be made of that sold under the name JAGUAR HP 105 SGI by the company RHODIA (SOLVAY).

Salt of m water-soluble alkali metal ' water

In one embodiment of the present invention, the water-soluble alkali metal salt which can be used includes all kinds of alkali metal (e.g., Li, Na, K, etc.) which form soluble salts (chlorides, nitrates, etc.) acceptable in the cosmetic field.

In one embodiment of the present invention, the water-soluble alkali metal salt is selected from water-soluble alkali metal salts of inorganic acid(s) and/or acid( s) organic(s). The water-soluble alkali metal salt of an inorganic acid is selected, for example, from alkali metal chlorides, nitrates of alkali metal salts, an alkali metal citrate, an alkali metal sulphate, a carbonate alkali metal, an alkali metal bicarbonate, an alkali metal phosphate, an alkali metal acetate and the like. The water-soluble alkali metal salt of organic acid is selected from, for example, an alkali metal salt of EDTA, alkali metal salt of carboxylic acid, alkali metal salt of lactic acid, salt of alkali metal of acetic acid, alkali metal salt of formic acid, alkali metal salt of uric acid, alkali metal salt of malic acid, alkali metal salt of tartaric acid, and the like.

In one embodiment of the present invention, the alkali metal is chosen from Li, Na and K.

In one embodiment of the present invention, the water-soluble alkali metal salt is selected from the disodium salt of ethylenediaminetetraacetic acid (i.e., the disodium salt of EDTA) and sodium citrate. .

In one embodiment of the present invention, the amount of water-soluble alkali metal salt is between 0.01 and 15% by weight, preferably between 0.05 and 12% by weight, or between 0. 1 and 10% by weight, or even between 1 and 8% by weight, based on the weight of the hydrogel layer.

In one embodiment of the present invention, the weight of the hydrogel layer ranges from 400 g/m ² to 1600 g/m ² .

In addition to water, water-soluble alkali metal salt and hydrophilic thickener mentioned above, the hydrogel layer of the present invention may include additional components.

Additional components

As additional components, mention may be made of water-miscible or at least partially water-miscible compounds to improve the sensation of hydration, for example polyols C ₂ to C ₈ lower monoalcohols or, such as ethanol and isopropanol.

The term "polyol" should be understood as meaning any organic molecule comprising at least two free hydroxyl groups. Examples of polyols include glycols, for example pentylene glycol, butylene glycol, propylene glycol, and isoprene glycol, caprylyl glycol, glycerol (i.e. glycerine) and polyethylene glycols.

As additional components, a sebum-absorbing ingredient may also be mentioned.

The sebum-absorbing ingredient can be inorganic or organic sebum-absorbing particles. The particles of one or more inorganic compounds used in the hydrogel layer can have different shapes, for example spheres, solid or hollow, flakes, needles or platelets and are preferably approximately spherical.

More specifically, the sebum-absorbing particles can be chosen from:

- silica powders,

- polyamide powders (Nylon ^® ),

- acrylic polymer powders, in particular polymethyl methacrylate, poly(methyl methacrylate/ethylene glycol dimethacrylate), poly(allyl methacrylate/ethylene glycol dimethacrylate), ethylene glycol dimethacrylate/lauryl methacrylate copolymer ,

- silicone elastomer powders, obtained in particular by polymerization of an organopolysiloxane containing at least two hydrogen atoms each bonded to a silicon atom and of an organopolysiloxane comprising at least two ethylenically unsaturated groups (in particular two vinyl groups) in the presence of a platinum catalyst,

- polylactic acid,

- cellulose,

- talc,

- carbon black,

- pearlite

- clays, and

- a mixture of these.

The sebum-absorbing particle may be a powder coated with a hydrophobic treatment agent.

The hydrophobic treatment agent can be chosen from fatty acids, for example stearic acid; metallic soaps, for example aluminum dimyristate, hydrogenated tallow glutamate aluminum salt; amino acids; N-acylamino acids or their salts; lecithin, isopropyl triisostearyl titanate, waxes and mixtures thereof.

The N-acylamino acids can comprise an acyl group containing from 8 to 22 carbon atoms, for example a 2-ethylhexanoyl, caproyl, lauroyl, myristoyl, palmitoyl, stearoyl or cocoyl group. The salts of these compounds can be aluminum, magnesium, calcium, zirconium, zinc, sodium or potassium salts. The amino acid can be, for example, lysine, glutamic acid or alanine.

As non-limiting illustrations of the sebum-absorbing particles according to the invention, mention may be made more particularly of the particles below.

The silicas which can be used can be natural and untreated. Mention may thus be made of the silicas supplied under the names Sillitine N85, Sillitine N87, Sillitine N82, Sillitine V85 and Sillitine V88 by Hoffmann Mineral.

They may be fumed silicas.

Fused silicas can be obtained by high temperature hydrolysis of a volatile silicon compound in an oxyhydrogen flame, producing finely divided silica. This process makes it possible in particular to obtain hydrophilic silicas which contain a large number of silanol groups on their surface. It is possible to chemically modify the surface of said silica by a chemical reaction which causes a reduction in the number of silanol groups. It is in particular possible to replace the silanol groups with hydrophobic groups; a hydrophobic silica is then obtained.

Hydrophobic groups can be:

(a) trimethylsiloxyl groups, obtained in particular by treatment of fumed silica in the presence of hexamethyldisilazane. The silicas thus treated are known by the name “silica silylate” according to the CTFA (6th edition, 1995);

b) dimethylsilyloxyl or polydimethylsiloxane groups, which are obtained in particular by treatment of fumed silica in the presence of polydimethylsiloxane or dimethyldichlorosilane. The silicas thus treated are called “silica dimethyl silylate” according to the CTFA (6th edition, 1995).

Silica powders that can be specifically mentioned include:

- porous silica microspheres sold under the name Silica Beads SB-700 by Miyoshi; Sunsphere H51, Sunsphere H33 by Asahi Glass;

- amorphous silica microspheres coated with polydimethylsiloxane sold under the name SA Sunsphere H33 and SA Sunsphere H53 by Asahi Glass;

- precipitated silica microspheres, for example coated with inorganic wax such as polyethylene, and sold in particular under the name Acematt OK 412 by Evonik Degussa

- Silica silylate, such as DC VM-2270 sold by DOW CORNING and KTL 10 sold by TOKUYAMA.

Acrylic polymer powders that may be mentioned include:

Acrylic copolymer powder, such as EXPANCEL 551 sold by the company AKZO NOBEL;

Lauryl methacrylate/glycol dimethacrylate crosslinked polymer powder, such as Polytrap 6603 sold by the company AMCOL HEALTH & BEAUTY SOLUTIONS;

Polymethyl methacrylate, such as SEPIMAT H10 sold by the company MATSUMOTO YUSHI-SEIYAKU.

A nylon powder which may be mentioned is the nylon powder sold under the name Orgasol 4000 by Atochem.

The silicone elastomers are in particular partially or totally crosslinked organopolysiloxanes, having a three-dimensional structure, such as those sold under the names KSG6 ^® , KSG16 ^® and KSG18 ^® by SHIN-ETSU, Trefil E-505C ^® and Trefil E-506C ^® by DOW-CORNING, Gransil SR-CYC ^® , SR DMF10 ^® , SR-DC556 ^® , SR 5CYC gel ^® , SR DMF 10 gel ^® and SR DC 556 gel ^® by GRANT INDUSTRIES, SF 1204 ^® and JK 113 ^® by GENERAL ELECTRIC.

Silicone elastomer powders which may be mentioned include powders sold under the names "Trefil Powder E-505C" and "Trefil Powder E-506C" by Dow Corning.

As silicone powder, mention may be made of beads of crosslinked polydimethylsiloxane gum coated with silsesquioxane resin, in particular sold under the name KSP100 by Shin Etsu, silicone resin powders in the form of rugby balls such as in particular the product sold under the name NLK-602 by TAKEMOTO.

As polylactic acid, mention may be made of PLA TORAYPEARL sold by the company TORAY INDUSTRIES.

As a cellulose powder, mention may be made of CELLULOBEADS USF sold by the company DAITO KASEI.

Perlite is a natural glass of volcanic origin, light gray or shiny black in color, which results from the rapid cooling of lava and which appears in the form of small particles resembling pearls.

The perlite particles used according to the invention are in particular commercially available from World Minerals Europe under the trade name Perlite P1430, Perlite P2550 or Perlite P2040. These particles are sold as matting agents for paints. They are in the form of a white powder having a crystalline silica content of less than 0.1% by weight, based on the total weight of the composition.

Preferably, the perlite particles according to the invention have a particle size distribution such that at least 50% by weight of the particles have a size of less than 25 μm, preferably less than 20 μm. Furthermore, they preferably have a particle size distribution such that 90% by weight of the particles have a size of less than 55 μm and preferably less than 40 μm. Furthermore, it is preferable that 90% by weight of the particles have a size greater than 5 μm.

Boron nitride particles can be mentioned, such as PUHP1030L by Saint Gobain Ceramics, UHP-1010 by Carborundum, Ronaflair Extender by Merck, Covalumine Atlas White AS by Sensient, Boroneige 601 by ESK, PUHP3008 by Saint Gobain Ceramics.

Clays are products that are already well known per se, which are described, for example, in the publication Mineralogy of clays, S. Caillère, S. Hénin, M. Rautureau, 2nd edition 1982, Masson.

Clays are silicates containing a cation which can be chosen from calcium, magnesium, aluminium, sodium, potassium and lithium cations, and mixtures thereof.

Examples of products which may be mentioned include clays of the smectite family such as montmorillonites, hectorites, bentonites, beidellites and saponites, as well as those of the vermiculite family, stevensite and chlorites.

Clays can be of natural or synthetic origin. Clays which are cosmetically compatible and acceptable with keratinous fibers such as the hair are preferably used.

Clays can be selected from montmorillonite, bentonite, hectorite, attapulgite, sepiolite and mixtures thereof. Preferably, the clay is a bentonite or a hectorite.

The clays can be selected from organophilic clays.

Organophilic clays are clays modified with a chemical compound chosen from among quaternary amines, tertiary amines, amine acetates, imidazolines, amine soaps, fatty sulphates, alkyl aryl sulphonates and amine oxides , and mixtures thereof.

Preferably, the organophilic clays according to the invention are clays modified with a chemical compound chosen from quaternary amines.

Organophilic clays which may be mentioned include quaternium-18 bentonites such as those sold as Bentone 3, Bentone 38 and Bentone 38V by Elementis, Tixogel VP by United Catalyst, and Claytone 34, Claytone 40 and Claytone XL by Southern Clay. ; stearalkonium bentonites such as those sold under the names Bentone 27V by Elementis, Tixogel LG by United Catalyst, and Claytone AF and Claytone APA by Southern Clay and quaternium-18/benzalkonium bentonites such as those sold under the names Claytone HT and Claytone PS by Southern Clay.

The organophilic clay is in particular selected from modified hectorites such as hectorite modified with a C ₁₀ -C ₁₂ fatty acid ammonium chloride, in particular distearyldimethylammonium chloride and stearylbenzyldimethylammonium chloride.

The clays are selected in particular from montmorillonites and kaolin.

Particularly preferred particles which absorb sebum are silica powders, in particular especially precipitated silica powders and more specifically wax-coated precipitated silica, boron nitride, acrylic polymer powders.

The particles preferably have a number-average size of between 50 nm and 350 microns, better still between 100 nm and 100 microns and even more preferably between 0.5 and 100 microns.

Fiber-based layer

According to the present invention, the fiber-based layer(s) can be (all) fiber-based layers that can effectively absorb the active ingredients of the hydrogel and deliver them to the skin.

The fiber-based layer(s) comprises a compound (e.g. fiber salt(s), e.g. calcium alginate etc.) which is capable of reacting with the water-soluble alkali metal salt. water (eg, EDTA disodium salt or sodium citrate, etc.) included in the hydrogel layer to form an alkali metal salt (eg, sodium alginate), wherein the metal salt alkali obtained is a hydrophilic substance. The obtained hydrophilic alkali metal salt can therefore absorb water and/or aqueous substances, including water-soluble components enclosed in the hydrogel layer, so that water and water-soluble components water from the gel are continuously transferred out of the gel into the fiber-based layer. Thus, the fiber-based layer brings water and water-soluble components to keratinous materials, in particular to the skin.

The present invention relates to a sheet of the fiber-based diaper. Since the fibrous layer is used as a part of the sheet, the material of the fibrous layer is a material which can absorb the active substances of the hydrogel and deliver them to the skin, the fibrous layer being based on at least one of following elements selected from natural, natural, artificial and/or synthetic fibers which can all be layers based on fibers which can effectively absorb the active substances of the hydrogel and deliver them to the skin, for example, fibers of (bio )natural cellulose or (bio)cellulose fibers preferably made from alginate fibers and cellulose fibers, a mixture thereof. Two or more substances selected from those mentioned above may be used in combination.

In one embodiment of the present invention, preferably, the fiber-based layer is based on alginate fiber and other fibers.

In one embodiment of the present invention, preferably, the fiber-based layer is based on alginate fibers and cellulose fibers.

In one embodiment of the present invention, the compound used in the fiber-based layer(s) which is capable of reacting with the water-soluble alkali metal salt included in the hydrogel layer is a divalent fiber salt, for example, calcium alginate.

In one embodiment of the present invention, the weight of the fiber-based layer ranges from 18 g/m ² to 60 g/m ² .

In one embodiment of the present invention, the fiber-based diaper is an alginate-based diaper, comprising from 0.1% to 50% by weight calcium alginate fibers with 50% to 99.9 % by weight of at least one other cellulose fibre, based on the total weight of the composition.

In one embodiment, the present fiber-based layer (preferably alginate-based layer) can effectively absorb the active substances of the hydrogel and deliver them to keratinous materials, in particular the skin. The present fiber-based layer (preferably alginate-based layer) has an excellent supply capacity when applied to keratinous materials, in particular the skin.

Mask

According to the present invention, the present fiber-based layer is coated on the hydrogel layer, and the present fiber-based layer can help the actives provided by the hydrogel so that the mask greatly improves the delivery capacity of the hydrogel type mask, and making the hydrogel layer of the "carrier material" a real functional layer.

The folded mask according to the present invention may consist of two or more layers. Thus, for example, the mask may consist of two or more stacked layers. If a layered mask is used, the materials in each stacked layer can be the same or different from each other. For example, the layered mask can be prepared by laminating the above layer(s) or sheet, for example by a hot stamping process.

The mask can be made in a wide variety of shapes such as flat pads, thick pads, thin sheets of irregular thickness, depending on the intended use and characteristics of the mask. The mask is typically designed to conform to the area of keratinous material (particularly the skin, and more preferably the skin of the face) to which topical application is desired. For example, when the mask is applied to the face, it is designed to match the shape of the face avoiding the eye, nostril and mouth areas where necessary.

The weight ratio between the hydrogel layer and the fiber-based layer applied to the hydrogel layer is between 99:1 and 80:20, preferably between 99:1 and 80:15, or between 99: 1 and 85:15, or even between 98:2 and 90:10.

In one embodiment, in the present mask, the fiber-based layer (as the primary layer, i.e. the lowest layer) is the layer which is in direct contact with the keratinous materials.

Considering the presence of active agent and hydrophilic substances beneficial to keratinous materials (e.g. skin) in the hydrogel layer, the mask of the present invention showed considerable improvement over the high loaded amount of actives and hydrophilic substances, namely the mask of the present invention loads more actives and hydrophilic substances so as to supply them effectively to keratinous materials (e.g. skin) and shows good skin conditioning effect, such as hydration, freshness, smoothness, softness effect and for long-term use.

Active Agents

According to an embodiment of the present invention, the mask of the present invention can comprise at least one functional agent (called active agent or actives), such as, for example, at least one active agent (preferably, added in the layer hydrogel), chosen from: drugs; desquamating or moisturizing agents; depigmentation or anti-depigmentation agents; anti-glycation agents; anti-NO agents; agents for stimulating the synthesis of dermal or epidermal macromolecules and/or for preventing their degradation; agents for stimulating the proliferation of fibroblasts or keratinocytes and/or the differentiation of keratinocytes; muscle relaxants or dermo-decontracting agents; free radical scavengers or anti-pollution agents; tightening agents; agents acting on capillary circulation; certainly, the following particularly active agents, and mixtures thereof.

Among all the active agents which can be used in the present invention, mention may be made in particular of: α- or β-hydroxy acids such as lactic acid, glycolic acid, citric acid, 5-octanoylsalicylic acid, α-hydroxydecanoic acid, α-hydroxylauric acid, tartaric acid, glucuronic acid, galacturonic acid, acrylic acid, α-hydroxybutyric acid, α-hydroxyisobutyric acid, malic acid, mandelic acid, phosphoric acid, pyruvic acid, lactobionic acid and salicylic acid.

It is also possible to use anti-acne agents, such as salicylic acid or benzoyl peroxide, octopirox, dextrorotatory and levorotatory sulfur amino acids, their salts, and their N-acetyl derivatives such as N- acetyl cysteine, or agents aimed at preventing aging of the skin and/or improving its condition, for example the aforementioned α- and β-hydroxy acids, retinoids such as retinoic acid, retinol and its esters, such as retinyl propionate and retinyl acetate, or retinyl palmitate, niacinamide, allantoin, aloe extracts, azelaic acid, bisabolol, phytic acid, collagen, or agents stimulating the formation of collagen, vitamins such as vitamin C or their derivatives, such as ascorbyl glucoside, vitamin E or its derivatives, vitamin A or its derivatives, vitamin F or its derivatives, dextrorotatory sulfur amino acids and levogyres and their derivatives as mentioned above , elastin, N-acetyl D-glucosamine, luteolin, or antioxidants such as green tea or its active fractions, glycerin, laponite, caffeine, aromatic essential oils, coloring agents, carbon scavengers, free radicals, moisturizers, depigmentation agents, agents intended to improve the color of the skin such as artificial tanning agents of the dihydroxyacetone or tyrosine ester type, lipo-regulators, softeners, anti-wrinkle agents, agents keratolytics, fresheners, deodorants, anesthetics, nourishing agents and mixtures thereof. It is also possible to use bleaching agents such as kojic acid, ascorbyl phosphates, ascorbyl glucosides, ascorbic acid and mixtures thereof.

It is also possible to use active agents to improve the condition of the skin in the case of masks, such as moisturizers or agents serving to improve the natural lipid barrier, such as ceramides, cholesterol sulphates and/ or fatty acids, and mixtures thereof. It is also possible to use enzymes which have an activity on the skin, such as proteases, lipases, cerebrosidases and/or melanases, and mixtures thereof.

Other examples of active agents that may be suitable for the implementation of the present invention include agents for drugs, peptides, proteins, detectable labels, contrast reagents, analgesics, anesthetics, antibacterial agents, anti-yeast agents, antifungal agents, antiviral agents, antidermatitis agents, antipruritic agents, antiemetics, vascular protectants, motion sickness agents, anti-irritants, anti-inflammatories, immunomodulators, anti-hyperkeratolytics, dry skin treatment agents, antiperspirants, anti - psoriatics, anti-dandruff agents, anti-aging agents, anti-asthmatic agents and bronchodilators, sunscreen agents, antihistamines, healing agents, corticosteroids, tanning agents and mixtures thereof.

The content of at least one active agent in the first composition and/or in the second composition can be adjusted according to the desired purpose of the mask.

Additives

In a known manner, the mask of the present invention may also contain adjuvants which are common in cosmetics and/or in dermatology, such as preservatives, antioxidants, pH modifiers (acidic or basic), perfumes, fillers , bactericides, odor absorbers, colorants (pigments and tints), emulsifiers, and also lipid vesicles.

It goes without saying that those skilled in the art will take care to choose this or these optional additional compounds, and/or their quantity, so that the benefits of the second composition according to the present invention are not, or are substantially not substantially affected by the proposed addition.

Method and use

The mask or a dressing for skin wounds according to the present invention can be prepared by following the following steps:

- (1) provision of a fiber-based layer; And

- (2) providing a hydrogel layer comprising active agent(s),

- (3) coating of the fiber-based layer on the hydrogel layer.

According to one embodiment, the step (3) of coating the fiber layer on the hydrogel layer is carried out by the hot coating process.

According to one embodiment, the mask according to the present invention is prepared by the process comprising the following steps:

- fixation of the fabric on a cylinder, and one end is inserted between the 2 pressing cylinders,

- maintaining the hydrogel in the tank at a temperature of 50-70°C,

- pouring the hot fluid hydrogel in bulk drop by drop onto the fabric,

- fixing the distance between the 2 cylinders at 0.1-0.2 cm,

- compression and cooling of the hydrogel layer using 2 pressing cylinders with cooling system,

- cutting of the final mask in the shape of a face (normally 300-350cm ² with holes for the eyes, nose and mouth).

According to one embodiment, the mask according to the present invention can be used to treat keratinous materials, preferably the skin, and more preferably the skin of the face; and can also be used to manage skin injuries, to prevent the formation of post-surgical adhesions, or to fill or repair osteochondral defects, and so on. Such use may manifest as a process of managing skin wounds, preventing the formation of post-surgical adhesions, or filling or repairing osteochondral defects, including the application of this mask or this skin wound dressing of the present invention to a location that needs it.

Although the numerical ranges and parameters defining the broad scope of the present invention are approximate, the numerical values specified in the specific examples are reported as accurately as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective measurements. The following examples are intended to illustrate the present invention without limiting its scope.

The following examples are intended to illustrate the compositions and processes according to the present invention, but in no way constitute a limitation of the scope of the invention. All parts and percentages in the examples are given on a weight basis and all measurements were obtained at about 25°C, unless otherwise noted.

DESCRIPTION OF DRAWINGS

There shows the coating process during the preparation of this mask.

EXAMPLES

exe m ple 1 : Fiber-based diaper preparation

Preparation protocol:

The alginate based layer was prepared by the fiber which was available from Eastex company as E8080142（20 wt% calcium alginate, 80 wt% cellulose, fabric density was 40g/ ^m2 .

exe m ple 2 : Preparing the layer ' hydro gel

Preparation protocol:

The formulas for the hydrogel layer were as follows:

INCI name Content (% by weight of the active ingredient relative to the total weight of the hydrogel layer) Formula 1a Form 2a Formula 3a Niacinamide 1 - 1 caffeine - 2.5 2.5 Xanthan gum - 0.6 0.4 Carrageenan 0.5 0.2 0.2 Glucomannan 0.5 0.2 0.4 Glycerine 3 7 10 Sodium citrate 1 1.5 0.5 water Up to 100 Up to 100 Up to 100

PROCESS :

1. Adding all the ingredients to a cooker.

2. Heat the mixture to 70-80°C, mix until all the ingredients are well dissolved

3. Stop the mixture, maintain the mixture at 80-85°C.

4. Cooling to room temperature.

exe m ple 3 : Preparation of m ascus

The alginate-based layer as above was in close contact with the hydrogel layer obtained as above by the hot-melt process.

Preparation protocol:

The coating process has been presented in the form of the snapshot below on the .

PROCESS :

1. Fixing the fabric on a cylinder, and inserting one end between the 2 pressing cylinders,

2. Maintaining the hydrogel in the tank at the temperature of 50-60°C,

3. Drop by drop pouring the volume of hot fluid hydrogel onto the fabric,

4. Fixing the distance between the 2 cylinders to 0.1-0.2 cm,

5. Compression and cooling of the hydrogel layer using the 2 pressing cylinders with cooling system,

6. Cutting of the final mask in the shape of a face (normally 300-350cm ² with holes for the eyes, nose and mouth).

exe m pls co m paratives : preparation ( fabric 5*5 c m ² )

The following examples have been prepared:

1. Co m parative example 1 :

The masks of Comparative Example 1 were prepared by coating the hydrogel layer over the alginate-based layer (the formula of the hydrogel layer and the composition of the alginate base layer are as follows)

[Table 2]

Formula 1 INCI % in weight Niacinamide 0 caffeine 2.5 Xanthan gum 0.2 Carrageenan 0.6 Glucomannan 0.4 Glycerine 8 Sodium citrate 1.5 water Up to 100

[Table 3]

Fabric 1 Making up % in weight Calcium alginate fiber 20 Cellulose fiber 80 fabric weight ^40gsm

Preparation protocol:

1. Fixing the fabric on a cylinder, and inserting one end between the 2 pressing cylinders,

2. Maintaining formula 1 of the hydrogel in the tank at a temperature of 60°C,

3. Drop by drop pouring the volume of hot fluid hydrogel onto the fabric,

4. Fixing the distance between the 2 cylinders at 0.15 cm,

5. Compression and cooling of the hydrogel layer using the 2 pressing cylinders with cooling system,

6. Cutting of the final mask in the shape of a small square (5*5 cm ² fabric).

2. Co m parative example 2 :

The masks of Comparative Example 2 were prepared by impregnating the alginate fabric with the following function formula.

[Table 4]

Formula 2 INCI % weight caffeine 2.5 Xanthan gum 0.5 Glycerine 8 Sodium citrate 1.5 water Up to 100

[Table 5]

Tissue 1 Making up % in weight Calcium alginate fiber 20 Cellulose fiber 80 fabric weight ^40gsm

Preparation protocol:

1. Cutting the fabric in the shape of 5cm*5cm

2. Impregnation of the small tissue in 2.5 g of juice

3. Lifting the fabric.

3. Co m parative example 3 :

The masks in Comparative Example 3 were prepared by forming a hydrogel layer without a fabric layer, the formula is the same as in Example 1.

[Table 6]

Formula 3 INCI % in weight Niacinamide 0 caffeine 2.5 Xanthan gum 0.2 Carrageenan 0.6 Glucomannan 0.4 Glycerine 8 Sodium citrate 1.5 water Up to 100

Preparation protocol:

1. Fixing the fabric on a cylinder, and inserting one end between the 2 pressing cylinders,

2. Maintaining the hydrogel formula 1 in the tank at the temperature of 50-60°C,

3. Drop by drop pouring the hot fluid hydrogel in bulk onto a plastic or steel plate,

4. Fixing the distance between the 2 cylinders at 0.15 cm,

5. Compression and cooling of the hydrogel layer using the 2 pressing cylinders with cooling system,

6. Cutting of the final mask in the shape of a small square (5*5 cm ² ).

Assessment :

1. Capacity to contribute

Evaluation protocol:

- Mask (1) (the mask of the present invention): coating of 2.5 g of hydrogel on top of the 20% by weight of alginate fibers; then application of the alginate tissue side on a flat plate for 20 minutes (A); then measure the total amount of residual functional liquid on the plate.

Mask (2) (comparative mask including only the alginate-based layer): Supply the 2.5 g of the same functional liquid as indicated in Table 1 to impregnate the alginate-based layer, then apply the tissue side to alginate base on a flat plate for 20 minutes (A); then measurement of the total quantity of residual functional liquid on the plate; and measurement of the residual active ingredient content on the plate

- Mask (3) (Comparative mask including only the hydrogen layer): production of the hydrogel layer without alginate fiber, weighing 2.5 g, then application of the hydrogel side on the plate for 20 minutes (B) Then measure the total amount of residual functional liquid on the plate. Measurement of residual active ingredient on the plate

- Mask (4) (comparative mask using the hydrogel layer to provide the active ingredients): coating of 2.5 g of hydrogel on the alginate fiber at 20% by weight; then application of the tissue side of the hydrogel to a flat plate for 20 minutes (B); then measurement of the total quantity of residual functional liquid on the plate; measurement of the residual active ingredient content on the plate

Evaluation result

The results of the evaluation were as shown in the table below.

Mask (1)
(the mask of the present invention) Mask (2)
(Comparative mask only including the alginate-based layer) Mask (3)
(Comparative mask only including the hydrogen layer) Mask (4)
(Comparative mask using the hydrogel layer to provide active ingredients) Original functional fluid used
(expressed in mg) 2500 2500 2500 2500 Total amount of residual functional liquid
(expressed in mg) 75 80 0.60 0.74 Total amount of functional ingredient (caffeine, expressed in mg) 2.5 2.0 below detection limit below detection limit

The results showed that the supply of active ingredients by the mask (1) (the mask of the present invention) was much greater than that of masks (comparative mask, not according to the present invention).

2. Number of loading in functional liquid on the M ascus

Evaluation protocol:

- Mask (1) (the mask of the present invention): coating of a hydrogel layer of 33 g on the alginate fiber, measurement of the weight of the hydrogel filler on the alginate fiber

- Mask (2) (Comparative mask only including the alginate-based layer): Fusion of the alginate fabric in the functional liquid of 33g as shown in Table 1, lifting and measuring the loaded amount of liquid functional on the mask.

The results of the evaluation were as shown in the table below.

Mask (1)
(the mask of the present invention) Mask (2)
(Comparative mask only including the alginate-based layer) Original functional fluid used
(expressed in g) 33 33 charged amount of the functional liquid on the mask
(expressed in g) 33 28

The result showed that the weight of the functional liquid loaded on the mask (2) was 28g; while the mask according to the present invention, there remained 33g of functional liquid on the mask.

Conclusion

Compared to the prior art (a hydrogel layer alone or an alginate-based layer alone), the mask of the present invention showed a considerable improvement on the high loaded quantity of active ingredients and a good ability to supply, that is, the mask of the present invention loads more actives to effectively supply them to the skin and shows good skin conditioning effect, such as moisturizing, freshness, character smooth, the effect of softness and long-term use.

Claims (10)

Mask for the care of keratinous materials, comprising:
(1) at least one hydrogel layer,
(2) at least one fiber-based layer,
wherein one or more fiber-based layers is the layer which is closer to the keratinous materials after application than any hydrogel layer present in the mask. A mask according to claim 1, wherein the hydrogel layer(s) comprises (include) water, at least one gelling composition and at least one water-soluble alkali metal salt. Mask according to Claim 2, in which the gelling composition comprises at least one hydrophilic thickener, in particular the hydrophilic thickener is chosen from:
- anionic, cationic, amphoteric or nonionic chitin or chitosan polymers;
- Cellulose polymers, in particular (C ₁ -C ₃ )hydroxyalkylcelluloses, chosen from hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxymethylcellulose, ethylhydroxyethylcellulose, carboxymethylcellulose and quaternized derivatives of cellulose;
- vinyl polymers, for example polyvinylpyrrolidones, copolymers of methylvinyl ether and malic anhydride, copolymer of vinyl acetate and crotonic acid, copolymers of vinylpyrrolidone and vinyl acetate; copolymers of vinylpyrrolidone and caprolactam; polyvinyl alcohol,
- optionally modified polymers of natural origin, such as galactomannans and their derivatives, for example carrageenan gum, konjac gum, gellan gum, locust bean gum, fenugreek gum, karaya gum, gum tragacanth, gum arabic, gum acacia, guar gum, carboxymethyl guar, hydroxypropyl guar, hydroxypropyl guar modified with sodium methylcarboxylate groups, xanthan gum and their derivatives;
- alginates and carrageenans, for example carrageenans of the μ, κ, v, ι or λ type, and mixtures thereof in all proportions, preferably of the κ type;
- mucopolysaccharides such as hyaluronic acid; And
- mixtures thereof. Mask according to claim 2 or 3, wherein the water-soluble alkali metal salt is selected from the disodium salt of EDTA or sodium citrate. A mask according to any preceding claim, wherein the hydrogel layer(s) comprises at least one active agent. A mask according to any preceding claim, wherein the fiber-based layer comprises a compound, for example a divalent salt such as calcium alginate, which is capable of reacting with the water-soluble alkali metal salt. water, such as EDTA disodium salt or sodium citrate, included in the hydrogel layer to form a hydrophilic alkali metal salt, such as sodium alginate. A mask according to any preceding claim, wherein the fiber-based layer is an alginate-based layer, comprising from 0.1% to 50% by weight calcium alginate fibers and 50% to 99 9% by weight of cellulose fibers, based on the total weight of said layer. Process for the preparation of the mask as claimed in any one of the preceding claims, comprising the following steps:
- supply of a fiber-based layer;
- providing a hydrogel layer comprising active agent(s),
- coating of the fiber-based layer on the hydrogel layer. Use of the mask as claimed in any one of claims 1 to 7 and of the mask obtained by the process as claimed in claim 8, for the care of keratinous materials, preferably the skin, and more preferably the skin of the face, in particular, in which at least one fiber-based layer is the layer which is closer to the keratinous materials than the (all) layer(s) of hydrogel present in the mask. A non-therapeutic process involving the use of the mask as claimed in any one of claims 1 to 7 and the mask obtained by the process as claimed in claim 8, wherein the fiber-based layer is applied to the materials keratinous materials, preferably the skin, and more preferably the skin of the face, such that the fiber-based layer is in direct contact with the keratinous materials, preferably the skin, and more preferably the skin of the face .