Cosmetic composition for styling hair

Abstract

The invention relates to a cosmetic composition for styling hair, comprising a film-forming vinylpyrrolidone polymer, a polysiloxane obtainable by reacting an alkoxysilane composition with water; and a non-aqueous solvent.

Description

[0001] Cosmetic composition for styling hair

[0002] field of technology

[0003] The invention relates to cosmetic compositions for shaping hair, such as hairspray and hair styling products.

[0004] Current state of the art

[0005] Hair styling products play a significant role in everyday cosmetics. A distinction can be made between permanent and temporary styling products. Permanent styling products work by chemically breaking disulfide bonds in the hair proteins, particularly keratin, which are then reformed after styling. Temporary styling products, on the other hand, work by using film-forming substances that create a continuous film on the hair fibers, thus fixing the styled hair. This film can usually be easily washed out of the hair.

[0006] Products for temporarily styling hair can be used, for example, in the form of hairsprays, mousses, hair waxes, or hair gels. In addition to their styling effect, there is interest in the additional effects these products can produce. For example, UV absorbers, oils to enhance shine, vitamins to nourish the scalp, and similar ingredients are added to such products. Therefore, there is a constant demand for further hair styling products that can achieve additional cosmetically desirable effects.

[0007] Polysiloxanes obtained by condensation of alkoxysilanes are known in cosmetics for the production of hair dyes. These polysiloxanes form a flexible film on the hair. By adding suitable dyes to the film, the hair can be colored. Corresponding compositions based on alkoxysilanes and processes for their preparation are disclosed, for example, in WO 2020 / 177945 A1. Technical problem

[0008] Popular hair styling products based on film-forming polymers often have the disadvantage of only allowing for a single styling application. These products wash out upon contact with water and thus lose their styling effect. To restyle the hair, these products must be reapplied.

[0009] The object of the present invention is to overcome these disadvantages and to provide a means for shaping hair that allows repeated shaping of the hair without the need to wash the means out of the hair in between.

[0010] Description of the invention

[0011] Surprisingly, it has been shown that a composition with a film-forming vinylpyrrolidone polymer and a polysiloxane creates a polymer film on hair that can reversibly switch between a rigid and a flexible state, thus enabling repeated shaping of the hair.

[0012] A first object of the invention is therefore a cosmetic composition for shaping hair, comprising a film-forming vinylpyrrolidone polymer, a polysiloxane obtainable by reacting an alkoxysilane composition with water; and a non-aqueous solvent.

[0013] Preferably, the alkoxysilane composition comprises at least one alkoxysilane selected from the group consisting of (3-aminopropyl)triethoxysilane, (3-aminopropyl)trimethoxysilane, (2-aminoethyl)triethoxysilane, (2-aminoethyl)trimethoxysilane, (3-dimethylaminopropyl)triethoxysilane, (3-dimethylaminopropyl)trimethoxysilane, (2-dimethylaminoethyl)triethoxysilane and (2-dimethylaminoethyl)trimethoxysilane; and / or at least one alkoxysilane selected from the group consisting of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, tetramethoxysilane and tetraethoxysilane.

[0014] Preferably, the film-forming vinylpyrrolidone polymer is selected from the group consisting of polyvinylpyrrolidone, VP / VA copolymers, and mixtures thereof.

[0015] Preferably, the film-forming vinylpyrrolidone polymer is selected from the group consisting of polyvinylpyrrolidone K-30, polyvinylpyrrolidone K-60, polyvinylpyrrolidone K-90 and mixtures thereof.

[0016] Preferably, the non-aqueous solvent is selected from the group consisting of ethanol, 1-propanol, iso-propanol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, dipropylene glycol, diethylene glycol monoethyl ether, glycerol, phenoxyethanol, benzyl alcohol, polyalkylene glycol ether and mixtures thereof.

[0017] Preferably the composition comprises

[0018] 1 wt.% to 50 wt.% polysiloxane,

[0019] 1 wt.% to 30 wt.% film-forming vinylpyrrolidone polymer and at least 10 wt.% non-aqueous solvent, each based on the total weight of the composition.

[0020] Preferably, the composition contains 10% by weight or less water, based on the total weight of the composition.

[0021] Another aspect of the invention is the use of the cosmetic composition for styling hair. Preferably, the composition is applied to the hair so that it forms a film on the hair that can be reversibly transformed from a rigid to a flexible state.

[0022] Preferably, the use of the composition comprises the steps of: applying the composition to the hair so that the composition forms a film on the hair;

[0023] Hair shapes;

[0024] Drying the hair, whereby the film hardens and sets the shape of the hair; moistening the hair, whereby the film softens;

[0025] Reshaping the hair; and

[0026] The hair is then dried again, causing the film to solidify and firm the shape of the hair.

[0027] Advantageous effects of the invention

[0028] The composition according to the invention is suitable for styling hair. Surprisingly, the composition according to the invention forms a polymer film on hair that can reversibly switch between a rigid and a flexible state. The film-forming vinylpyrrolidone polymer and the polysiloxane can be dissolved in the non-aqueous solvent, resulting in a composition that can be easily applied to hair by hand or sprayed onto the hair using a suitable spray device. As the hair dries, the solvent evaporates, leaving a rigid, cohesive film on the surface of the hair fibers. The film is not brittle but elastic. It stabilizes the shape of the hair and makes it possible to style the hair into a desired hairstyle.

[0029] A particular advantage of the invention is that the film softens and becomes flexible upon the addition of water, without dissolving in the water. In this flexible state, the film allows the hair to be reshaped. Upon drying the hair again, the film hardens and thus fixes the respective hairstyle. This process can be repeated several times. Description of the embodiments

[0030] The following section describes in detail embodiments of the present invention. However, the present invention is not limited to the following embodiments.

[0031] Cosmetic composition

[0032] A first object of the invention is a cosmetic composition for styling hair. The composition according to the invention can be, for example, a hairspray, a mousse, a hair gel, or a hair wax. The composition can be liquid, gel-like, or wax-like. It can also be sprayable.

[0033] The cosmetic formula can be applied to the hair, forming a film. This film hardens upon drying, thus fixing the shape of the hair.

[0034] Polysiloxane

[0035] A key component of the cosmetic composition is a polysiloxane obtained by reacting an alkoxysilane composition with water. The polysiloxane is a compound obtained by the condensation of alkoxysilanes. Upon reaction with water, the alkoxysilanes in the alkoxysilane composition condense, releasing alcohols, to form polymers of varying lengths and degrees of branching. These polymers constitute the polysiloxane according to the invention. The structure of the polysiloxane is thus determined by the composition of the alkoxysilane composition. The polysiloxane can comprise polymers of different chain lengths. It can also include monomeric alkoxysilanes and short-chain polymers (e.g., dimers or trimers).The alkoxysilane groups in the monomer units of the polysiloxane can be completely or only partially hydrolyzed, so that the polysiloxane according to the invention still contains reactive alkoxysilane groups. The alkoxysilane composition preferably comprises alkoxysilanes with the structural formula R. 1 n Si(OR 2 )4-n, where n is an integer from 0 to 3, R 2 an alkyl group with 1 to 6 carbon atoms, and R 1 an alkyl group, alkenyl group or aminoalkyl group with 1 to 20 carbon atoms. Preferably n = 0 or 1.

[0036] Preferably R 1 an alkyl group, alkenyl group, or aminoalkyl group with 1 to 12 carbon atoms. In a preferred embodiment, R 1an aminoalkyl group selected from 2-aminoethyl, 3-aminopropyl, 2-dimethylaminoethyl and 3-dimethylaminopropyl, an alkyl group selected from methyl, ethyl, hexyl, octyl and dodecyl, or an alkenyl group selected from vinyl, allyl, and butenyl.

[0037] R 2 is preferably selected from methyl, ethyl, propyl, butyl, pentyl or hexyl. R is particularly preferred. 2 selected from methyl and ethyl.

[0038] In a preferred embodiment, the alkoxysilane composition comprises at least one alkoxysilane wherein R 1 an aminoalkyl group. Such alkoxysilanes are preferably selected from the group consisting of (3-Aminopropyl)triethoxysilane, (3-Aminopropyl)trimethoxysilane, (2-Aminoethyl)triethoxysilane, (2-Aminoethyl)trimethoxysilane, (3-Dimethylaminopropyl)triethoxysilane, (3-Dimethylaminopropyl)trimethoxysilane, (2-Dimethylaminoethyl)triethoxysilane and (2-Dimethylaminoethyl)trimethoxysilane.

[0039] In a further preferred embodiment, the alkoxysilane composition comprises at least one alkoxysilane wherein R 1 an alkyl group or an alkenyl group, or where n = 0. Such alkoxysilanes are preferably selected from the group consisting of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, tetramethoxysilane, and tetraethoxysilane. 2024P00162WG 7 28.11.2025

[0040] In a preferred embodiment, the alkoxysilane composition comprises at least one alkoxysilane wherein R 1 an aminoalkyl group, and at least one alkoxysilane, in which R 1 an alkyl group or an alkenyl group, or where n = 0.

[0041] In one embodiment, the alkoxysilane composition comprises at least one alkoxysilane selected from the group consisting of (3-aminopropyl)triethoxysilane, (3-aminopropyl)trimethoxysilane, (2-aminoethyl)triethoxysilane, (2-aminoethyl)trimethoxysilane, (3-dimethylaminopropyl)triethoxysilane, (3-dimethylaminopropyl)trimethoxysilane, (2-dimethylaminoethyl)triethoxysilane, and (2-dimethylaminoethyl)trimethoxysilane, and at least one alkoxysilane selected from the group consisting of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, tetramethyl ethoxysilane, and Tetraethoxysilane has been selected.

[0042] In a preferred embodiment, the alkoxysilane composition comprises methyltriethoxysilane and (3-aminopropyl)triethoxysilane. A polysiloxane formed from these alkoxysilanes has proven to be particularly suitable for the purpose of the present invention. Preferably, the alkoxysilane composition from which the polysiloxane is produced comprises 50 wt.% to 70 wt.% methyltriethoxysilane and 20 wt.% to 40 wt.% (3-aminopropyl)triethoxysilane, based on the total weight of the alkoxysilane composition.

[0043] In one embodiment, the alkoxysilane composition from which the polysiloxane is produced comprises 0.1 wt.% to 50 wt.% alkoxysilanes, wherein R 1 an aminoalkyl group, and 0.1 wt.% to 50 wt.% alkoxysilanes, in which R 1an alkyl group or an alkenyl group, or where n = 0, in each case based on the total weight of the alkoxysilane composition. Preferably, the alkoxysilane composition comprises at least 5 wt.%, particularly preferably at least 15 wt.%, most preferably at least 20 wt.% alkoxysilanes, where R 1 an aminoalkyl group, and at least 5 wt.%, 2024P00162WG 8 28.11.2025 particularly preferably at least 15 wt.%, most preferably at least 20 wt.% alkoxysilanes, in which R 1 an alkyl group or an alkenyl group, or where n = 0, in each case based on the total weight of the alkoxysilane composition.

[0044] The alkoxysilane composition is reacted with water to form the polysiloxane. In this reaction, the alkoxy groups of the alkoxysilanes hydrolyze to free OH groups. These condense together to form the polysiloxane according to the invention. Preferably, water is used in an amount of 1 wt.% to 20 wt.%, more preferably 5 wt.% to 15 wt.%, and most preferably 8 wt.% to 12 wt.%, based on the total weight of the alkoxysilane composition. For the calculation of these amounts, water is considered as part of the alkoxysilane composition. The reaction is preferably carried out at a temperature of 20 °C to 90 °C, more preferably 30 °C to 70 °C, and most preferably 40 °C to 60 °C. The reaction mixture is preferably stirred at this temperature for several hours, for example, 1 to 24 hours, more preferably 4 to 8 hours. The reaction is preferably catalyzed by a basic agent, for example, in the presence of a strong base such as sodium hydroxide.

[0045] The polysiloxane is obtained in the form of the product mixture from this reaction. Free alcohols and water are formed during the condensation reaction. These are considered byproducts and may be present in small amounts in the product mixture. However, they are not essential components of the polysiloxane according to the invention. Alcohols and water can be removed from the product mixture after the condensation reaction by suitable separation processes, for example, by distillation. Whenever the amount of polysiloxane in the cosmetic composition according to the invention is specified, this refers to the amount of alkoxysilane monomers and alkoxysilane polymers in the product mixture.

[0046] The cosmetic composition according to the invention preferably contains the polysiloxane in an amount of 1 wt.% to 50 wt.%, preferably 2 wt.% to 30 wt.%, particularly preferably 5 wt.% to 20 wt.%, most preferably 10 wt.% to 15 wt.%, based on the total weight of the cosmetic composition.

[0047] Film-forming vinylpyrrolidone polymer

[0048] A second essential component of the cosmetic composition is a film-forming vinylpyrrolidone polymer. When dry, this film-forming polymer leaves a closed film on the hair, which firms the hair's shape.

[0049] A vinylpyrrolidone polymer is a homopolymer or copolymer comprising vinylpyrrolidone monomer units. The vinylpyrrolidone polymer preferably has a molar mass in the range of 2500 g / mol to 750,000 g / mol. Preferably, vinylpyrrolidone polymers with a glass transition temperature in the range of 130 °C to 175 °C are used.

[0050] The film-forming vinylpyrrolidone polymer is preferably selected from the group consisting of polyvinylpyrrolidone, VP / VA copolymers, and mixtures thereof.

[0051] Vinylpyrrolidone-vinyl acetate copolymers (VPA / A copolymers) are particularly suitable film-forming polymers. Vinylpyrrolidone-vinyl acetate copolymers with a vinylpyrrolidone content of 30% to 70% of the total monomers are preferred.

[0052] Homopolymers based on vinylpyrrolidone (polyvinylpyrrolidone) are also particularly suitable. Polyvinylpyrrolidones of different molar masses are characterized by their K-value. Suitable polyvinylpyrrolidones are selected, for example, from the group consisting of polyvinylpyrrolidone K-30, polyvinylpyrrolidone K-60, polyvinylpyrrolidone K-90, and mixtures thereof. Polyvinylpyrrolidone K-90 is a particularly suitable vinylpyrrolidone polymer.

[0053] The cosmetic composition according to the invention contains the film-forming vinylpyrrolidone polymer preferably in an amount of 1 wt.% to 50 wt.%, 2024P00162WG 10 28.11.2025 preferably 2 wt.% to 30 wt.%, particularly preferably 5 wt.% to 20 wt.%, most preferably 10 wt.% to 15 wt.%, based on the total weight of the cosmetic composition.

[0054] Non-aqueous solvent

[0055] A third essential component of the cosmetic composition is a non-aqueous solvent.

[0056] Alcohols or ethers are preferably used as non-aqueous solvents. Mixtures of non-aqueous solvents can also be used.

[0057] The non-aqueous solvent is preferably selected from the group consisting of ethanol, 1-propanol, iso-propanol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, dipropylene glycol, diethylene glycol monoethyl ether, glycerol, phenoxyethanol, benzyl alcohol, polyalkylene glycol ether and mixtures thereof.

[0058] Polyethylene glycols (PEG) and polypropylene glycols (PPG) are preferably used as polyalkylene glycol ethers.

[0059] The composition preferably comprises 1 wt.% to 25 wt.% polyalkylene glycol ethers, particularly preferably 5 wt.% to 20 wt.%, based on the total weight of the composition.

[0060] In a preferred embodiment, the non-aqueous solvent comprises ethanol.

[0061] The cosmetic composition preferably comprises the non-aqueous solvent in an amount of at least 10% by weight. The non-aqueous solvent preferably constitutes the predominant part of the cosmetic composition. Therefore, the composition preferably comprises 30% by weight or more non-aqueous solvent, more preferably 40% by weight or more, particularly preferably 50% by weight or more, further preferably 60% by weight or more, and most preferably 70% by weight or more, based on the total weight of the composition.

[0062] The cosmetic composition preferably contains no or very little water. If the water content in the composition is too high, the strength of the film that forms on the hair when the composition is applied is impaired. Therefore, the composition preferably contains 10% by weight or less, more preferably 5% by weight or less, and more preferably 1% by weight of water, based on the total weight of the composition. Preferably, the composition contains no water.

[0063] Auxiliary materials

[0064] The composition may include other cosmetic excipients.

[0065] The composition may, for example, contain other film-forming polymers besides the vinylpyrrolidone polymer described above. Suitable additional film-forming polymers include, for example, polymers comprising (meth)acrylic acid, polysaccharides, and polyaminosaccharides.

[0066] According to the invention, the polymers comprising (meth)acrylic acid are considered to be homo- or copolymers based on (meth)acrylic acid or (meth)acrylic acid esters. Suitable polymers are preferably homo- or copolymers comprising monomers selected from the group consisting of acrylic acid, methacrylic acid, alkyl (meth)acrylates, hydroxyalkyl (meth)acrylates, (meth)acrylamides, aminoalkyl (meth)acrylates, and maleic anhydride.

[0067] Particularly preferred film-forming polymers are copolymers of octyl acrylamide, acrylates and butylaminoethyl methacrylate.

[0068] Suitable polysaccharides are preferably selected from the group consisting of cellulose, starch, guar gum, agar, carrageenan, and gum arabic. The polysaccharides may be modified with alkylene oxides, in particular ethylene oxide or propylene oxide. Preferred alkylene oxide-modified polysaccharides are hydroxypropyl cellulose and propylene oxide-modified starch. Furthermore, the polysaccharides may be cationically modified. Suitable cationically modified polysaccharides are, for example, dimethyldiallylammonium-modified hydroxyethylcellulose and guar hydroxypropyltrimonium chloride. The polysaccharides preferably have a molecular weight of 30,000 g / mol to 50,000 g / mol.

[0069] Chitosan is preferably used as the polyaminosaccharide. Chitosan is obtained by deacetylation of chitin. The degree of deacetylation of chitosan is preferably 80% or more, particularly preferably 80% to 90%. The chitosan preferably has a molecular weight of 800,000 g / mol to 1,200,000 g / mol. The chitosan may optionally be cationically modified or alkoxylated.

[0070] The amount of other film-forming polymers is preferably 0.05 wt.% to 30 wt.%, preferably 0.10 wt.% to 20 wt.%, particularly preferably 1 wt.% to 15 wt.%, based on the total weight of the composition.

[0071] In one embodiment, the composition does not include any film-forming polymers other than the vinylpyrrolidone polymer and polysiloxane described above.

[0072] The composition may include, for example, one or more quaternary ammonium compounds. Examples of quaternary ammonium compounds used are behentrimonium chloride, cetrimonium chloride, stearamidopropyldimethylamine, quaternium-80, polyquaternium-10, quaternium-91, polyquaternium-7, and dicetyldimonium chloride.

[0073] The composition preferably comprises 0.005 wt.% to 2 wt.% quaternary ammonium compounds, particularly preferably 0.01 wt.% to 1.5 wt.%, and more preferably 0.1 wt.% to 0.5 wt.% based on the total weight of the composition. The composition may also comprise one or more oils.

[0074] Preferably, an oil from the group of silicone oils, ester oils and vegetable oils is used.

[0075] Ester oils are esters of fatty acids and aliphatic or aromatic alcohols. Suitable ester oils include, for example, isopropyl myristate, cetyl ethylhexanoate, cetearyl ethylhexanoate, and octyldodecyl stearate.

[0076] Suitable vegetable oils include, for example, argan oil, coconut oil, jojoba oil, olive oil, grapeseed oil, almond oil, avocado oil, castor oil, macadamia oil and hemp oil.

[0077] Preferably, hydrogenated and optionally alkoxylated vegetable oils are used, such as hydrogenated and ethoxylated castor oil.

[0078] In one embodiment, the composition preferably comprises no more than 3% by weight of oils, more preferably 0.001% to 3% by weight, and particularly preferably 0.01% to 1% by weight, based on the total weight of the composition. This embodiment could, for example, be a hairspray, a mousse, or a gel.

[0079] In an alternative embodiment, the composition comprises higher proportions of oil, preferably up to 30 wt.%, particularly preferably 10 wt.% to 30 wt.%, based on the total weight of the composition. In this embodiment, the composition could, for example, be a hair wax.

[0080] In one embodiment, the composition comprises one or more surfactants. Preferably, the composition comprises at least one nonionic surfactant. Suitable nonionic surfactants are, for example, fatty alcohol ethers and alkyl polyglycosides, with the use of fatty alcohol ethers being particularly preferred.

[0081] The composition preferably comprises 0.1 wt.% to 5 wt.% nonionic surfactants, particularly preferably 0.1 wt.% to 3 wt.%, based on the total weight of the composition. 2024P00162WG 14 28.11.2025

[0082] Fatty alcohol ethers are obtained by reacting fatty alcohols with alkylene oxides. Particularly preferred fatty alcohol ethers are obtained by reacting fatty alcohols with 8 to 20 carbon atoms and alkylene oxides, especially ethylene oxide and / or propylene oxide. Particularly preferred fatty alcohol ethers comprise cetyl alcohol, stearyl alcohol, or mixtures thereof. Preferably, the fatty alcohol ethers comprise 2 to 60 alkylene oxide units, and particularly preferably 10 to 30 alkylene oxide units.

[0083] The composition preferably comprises 0.1 wt.% to 5 wt.% fatty alcohol ethers, particularly preferably 0.1 wt.% to 3 wt.%, based on the total weight of the composition.

[0084] Alkyl polyglycosides are preferably used.

[0085] The composition preferably includes at least one vitamin suitable for skin care. Suitable vitamins also include provitamins and vitamin precursors. Preferred vitamins are panthenol and niacinamide.

[0086] The formula may also contain a protein hydrolysate. Protein hydrolysates have a conditioning effect on hair and scalp. In this context, protein hydrolysates are complex mixtures of amino acids and oligopeptides obtained by hydrolyzing protein mixtures. A plant-based protein hydrolysate is preferably used.

[0087] In one embodiment, the composition is sprayable and comprises a propellant for this purpose. Preferably, the composition comprises a propellant selected from the group consisting of alkanes with 3 to 5 carbon atoms, such as butane, isobutane, or propane; dimethyl ether; carbon dioxide; nitrogen; and mixtures thereof. The propellant is preferably used in an amount of up to 50% by weight, more preferably 0.1% to 45% by weight, and particularly preferably 2% to 40% by weight, based on the total weight of the composition. In one embodiment, the composition comprises a wax. Suitable waxes are, for example, selected from the group consisting of beeswax, carnauba wax, candelilla wax, ozokerite, Japan wax, castor oil wax, lanolin wax, sunflower wax, rice wax, and mixtures thereof. Particularly preferred waxes are beeswax, carnauba wax, and candelilla wax.

[0088] If the composition contains a wax, it preferably comprises the wax in an amount of 5 wt.% to 30 wt.%, particularly preferably 10 wt.% to 20 wt.%, based on the total weight of the composition.

[0089] Finally, the composition may contain one or more fragrances. Preferably, it is a fragrance composition. The fragrances may be in liquid or encapsulated form.

[0090] use

[0091] A second object of the invention is the use of the cosmetic composition described above for shaping hair. For the purposes of this invention, "hair" refers to keratinous fibers, in particular human hair, preferably human scalp hair.

[0092] The formula can be applied to the hair, forming a film. This film makes the hair easier to style. Once the treated hair dries, the film hardens, thus fixing the style.

[0093] The composition is preferably applied to the hair in such a way that a film forms on the hair which can be reversibly transformed from a rigid to a flexible state.

[0094] The product is preferably applied to the hair by hand and distributed throughout. Alternatively, it can be sprayed onto the hair as an aerosol. The hair can then be styled as desired, for example, by hand, combing, brushing, or blow-drying.

[0095] Hair treated with this formula can be air-dried to harden the film. Drying is preferably accelerated by blow-drying at a higher temperature.

[0096] The special properties of the composition according to the invention make it possible to moisten the hair after drying in order to restore it to a malleable state. Preferably, the hair is moistened with water or an aqueous solution. This softens the film, allowing the hair to be easily shaped. The hair can then be dried again, during which time the film hardens once more and the hair retains its shape.

[0097] In one embodiment, the use therefore comprises the following steps: applying the composition to the hair so that the composition forms a film on the hair;

[0098] Hair shapes;

[0099] Drying the hair, whereby the film hardens and sets the shape of the hair; moistening the hair, whereby the film softens;

[0100] Reshaping the hair; and

[0101] The hair is then dried again, causing the film to solidify and firm the shape of the hair.

[0102] Examples

[0103] The present invention is described in more detail below with reference to examples. However, the present invention is not limited to the following examples.

[0104] The following examples show compounds with different

[0105] Amounts of vinylpyrrolidone polymer and polysiloxane were prepared. Polyvinylpyrrolidone K-90 (PVP K-90) was used as the vinylpyrrolidone. The polysiloxane was prepared by condensation of an alkoxysilane composition. The alkoxysilane composition contained 30 wt% aminopropyltriethoxysilane, 60 wt% methyltriethoxysilane, and 10 wt% water and was reacted with NaOH at a temperature of 50 °C for 6 hours with stirring to yield polysiloxane.

[0106] PVP K-90 and the polysiloxane were used in amounts of 0 wt%, 5 wt%, 10 wt%, 15 wt%, and 20 wt% each and combined. PVP K-90 and polysiloxane were dissolved in ethanol in the specified amounts and dried at a temperature of 60 °C for three days. Subsequently, the optical and mechanical properties of the resulting films were evaluated. Furthermore, the adhesion of the films to a polystyrene surface was investigated.

[0107] A comparison composition with 20 wt% PVP K-90 and without polysiloxane formed a flexible but brittle film that could not be removed from polystyrene.

[0108] A comparison composition with 20 wt% polysiloxane and without PVP K-90 formed a brittle, glassy and inflexible film.

[0109] Compositions containing 5 wt% to 20 wt% polysiloxane and 5 wt% to 20 wt% PVP K-90 formed flexible, slightly brittle, and transparent films that adhered less strongly to polystyrene than the film made of pure PVP K-90. With increasing amounts of PVP K-90, the film became more plastic-like and adhered more strongly to polystyrene. An increasing proportion of polysiloxane improved the water resistance and hardness of the film.

[0110] Following this initial examination, the dried films were soaked in distilled water for 5 minutes and then dried and evaluated again as described above. The results showed that the film made of pure polysiloxane did not change its properties. The film made of pure PVP K-90 dissolved on the polystyrene surface after soaking.

[0111] Inventive films made from compositions with 5 wt% PVP K-90 and 20

[0112] wt% polysiloxane, 20 wt% PVP K-90 and 20 wt% polysiloxane, or 20 2024P00162WG 18 28.11.2025

[0113] In contrast, 5 wt% PVP K-90 and 5 wt% polysiloxane initially became flexible and regained their original properties after drying. These films could therefore be reversibly transformed from a rigid to a flexible state.

Claims

2024P00162WG 19 28.11.2025 Patent claims 1. Cosmetic composition for shaping hair, comprising a film-forming vinylpyrrolidone polymer, a polysiloxane obtainable by reacting an alkoxysilane composition with water; and a non-aqueous solvent.

2. Cosmetic composition according to claim 1, wherein the alkoxysilane composition comprises at least one alkoxysilane selected from the group consisting of (3-aminopropyl)triethoxysilane, (3-aminopropyl)trimethoxysilane, (2-aminoethyl)triethoxysilane, (2-aminoethyl)trimethoxysilane, (3-dimethylaminopropyl)triethoxysilane, (3-dimethylaminopropyl)trimethoxysilane, (2-dimethylaminoethyl)triethoxysilane and (2-dimethylaminoethyl)trimethoxysilane; and / or at least one alkoxysilane selected from the group consisting of Methyltrimethoxysilane, Methyltriethoxysilane, Ethyltrimethoxysilane, Ethyltriethoxysilane, Hexyltrimethoxysilane, Hexyltriethoxysilane, Octyltrimethoxysilane, Octyltriethoxysilane, Dodecyltrimethoxysilane, Dodecyltriethoxysilane, Vinyltrimethoxysilane, Vinyltriethoxysilane, Tetramethoxysilane and Tetraethoxysilane.

3. Cosmetic composition according to claim 1 or 2, wherein the film-forming vinylpyrrolidone polymer is selected from the group consisting of polyvinylpyrrolidone, VP / VA copolymers, and mixtures thereof.

4. Cosmetic composition according to claim 3, wherein the film-forming vinylpyrrolidone polymer is selected from the group consisting of polyvinylpyrrolidone K-30, polyvinylpyrrolidone K-60, polyvinylpyrrolidone K-90 and mixtures thereof.

5. Cosmetic composition according to any one of claims 1 to 4, wherein the non-aqueous solvent is selected from the group consisting of ethanol, 1-propanol, iso-propanol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2- Butylene glycol, dipropylene glycol, diethylene glycol monoethyl ether, glycerin, phenoxyethanol, benzyl alcohol, polyalkylene glycol ether and mixtures thereof.

6. Cosmetic composition according to any one of claims 1 to 5, wherein the composition 1 wt.% to 50 wt.% polysiloxane, comprising 1 wt.% to 30 wt.% film-forming vinylpyrrolidone polymer and at least 10 wt.% non-aqueous solvent, each based on the total weight of the composition.

7. Cosmetic composition according to any one of claims 1 to 6, wherein the composition contains 10% by weight or less water, based on the total weight of the composition.

8. Use of a cosmetic composition according to any one of claims 1 to 7 for shaping hair.

9. Use according to claim 8, wherein the composition is applied to hair such that the composition forms a film on the hair which can be reversibly transformed from a rigid to a flexible state.

10. Use according to claim 8 or 9, comprising the steps of: Apply the composition to the hair so that the composition forms a film on the hair; Hair shapes; Drying the hair, whereby the film hardens and sets the shape of the hair; Moistening the hair, thereby softening the film; Reshaping the hair; and The hair is then dried again, during which the film hardens once more and the shape of the hair is solidified.