A method of colouring hair comprising the application of an adhesive composition comprising a polyurethane

Abstract

The present invention relates to a method of treating hair, wherein the method comprises the following steps a) applying an adhesive composition (AC) on at least partially dry hair sections (SD), wherein the adhesive composition (AC) comprises as component (A) at least one polyurethane and as component (B) at least one cosmetically acceptable carrier, b) drying the adhesive composition (AC) to form hair sections (SC) coated with the adhesive composition (AC), c) applying a hair colouring composition (HCC) onto the remaining hair which is not coated with the adhesive composition (AC) and, optionally, onto the hair sections (SC) coated with the adhesive composition (AC), d) leaving the hair colouring composition (HCC) on the hair, and e) subsequently rinsing both the adhesive composition (AC) and the hair colouring composition (HCC) from the hair. The present invention further relates to the use of an adhesive composition (AC) comprising at least one polyurethane (A), and at least one cosmetically acceptable carrier (B) for preventing or altering bleaching or dyeing effects on hair when contacting the hair with a hair colouring composition (HCC).

Description

[0001] A method of treating hair

[0002] Description

[0003] FIELD OF THE INVENTION

[0004] The present invention relates to a method of treating hair, wherein the method comprises the following steps a) applying an adhesive composition (AC) on at least partially dry hair sections (SD), wherein the adhesive composition (AC) comprises as component (A) at least one polyurethane and as component (B) at least one cosmetically acceptable carrier, b) drying the adhesive composition (AC) to form hair sections (Sc) coated with the adhesive composition (AC), c) applying a hair colouring composition (HCC) onto the remaining hair which is not coated with the adhesive composition (AC) and, optionally, onto the hair sections (Sc) coated with the adhesive composition (AC), d) leaving the hair colouring composition (HCC) on the hair, and e) subsequently rinsing both the adhesive composition (AC) and the hair colouring composition (HCC) from the hair. The present invention further relates to the use of an adhesive composition (AC) comprising at least one polyurethane (A), and at least one cosmetically acceptable carrier (B) for preventing or altering bleaching or dyeing effects on hair when contacting the hair with a hair colouring composition (HCC).

[0005] BACKGROUND OF THE INVENTION

[0006] Hair colouring or dyeing involves applying one or more dyes to the hair, resulting in a colouring of the hair fibres. There are different ways of colouring hair: For example, the hair colour can be subtly or dramatically changed as a whole. Nevertheless, only the root growth can be coloured to match the rest of the hair, or the same colour can be "refreshed" to counteract fading and / or wash-out. In addition, effects such as highlights or other sectional effects can be added.

[0007] While it is relatively easy to change the colour of the hair as a whole by dyeing to make it darker, or by bleaching to lighten it, the result of just dyeing or just bleaching can be disappointing. Hair treated in this way tends to have an uninteresting and boring uniform colour. Therefore, it is common to follow the dyeing or bleaching with a further step in which selected strands of hair are further treated so that their colour changes and these selected strands stand out against the background of the rest of the hair. Selected strands of a person's natural hair can also be treated in a similar way. The treatment of selected strands of hair to change the colour is called streaking / highlighting if the selected strands are lightened, or reverse streaking / reverse highlighting if they are darkened.

[0008] Colouring selected strands of hair is a difficult task for the hairdresser, as many strands of hair all over the head have to be treated individually with the appropriate treatment material, while the general mass of hair has to be protected from contact with the treatment material. Due to the time involved, the process is also exhausting for the client.

[0009] To date, two main methods have been known for creating streaks. In the first method, a thin elastic cap in the shape of a swimming cap is placed on the head of the person whose hair is to be streaked, into which holes are pierced with a needle in the shape of a crochet hook, and fine strands are pulled outwards. To these strands, hair dye is applied. In a similar process, strands of hair to be dyed are separated with a comb, a sheet of aluminium foil is placed under the strands, the hair dye is applied to the strands with a brush and the aluminium foil is then folded around the strands and sealed.

[0010] Alternatively, several coloured streaks can be created using a method in which several adhesive strips are painstakingly stuck to the hair to partially block the colouring in the desired areas. This method is feasible for shows and photo shoots for a limited time, but not in a commercially viable, consumer-relevant range as it is very tedious and time-consuming.

[0011] In an alternative method, each strand to be coloured is treated with an applicator brush to which the hair dye is applied by drawing the soaked applicator brush through the isolated strand from the root of the hair. This creates streaks that have sharply defined edges, giving an unnatural look.

[0012] EP 3 263 180 A1 discloses a method for coloring hair fibers into a first and a second patterns, wherein the hair fibers have one or more initial color shades. The method comprises the steps: a) providing an adhesive composition, wherein the adhesive composition comprises, in a cosmetically acceptable carrier, a film-forming polymer; b) providing a hair coloring composition for forming a final color shade, which differ from the one or more initial color shades; c) applying the adhesive composition to a first plurality of hair fiber portions to form a first pattern, wherein the first plurality of hair fiber portions are covered and immobilized by the first pattern; d) drying the first plurality of hair fiber portions; e) applying the hair coloring composition to a second plurality of hair fiber portion including the first plurality of hair fibers comprising the first pattern; f) rinsing the adhesive composition and the hair coloring composition out of the hair fibers, and drying the hair fibers, to form a second pattern, wherein the second pattern comprises the second plurality of hair fiber portions without the first pattern, such that the hair fibers comprises the first pattern which has the one or more initial color shades and the second pattern which has the final color shade. The film-forming polymer comprises aryl-sulfonated polyesters or acrylic copolymers.

[0013] However, it is difficult for aryl-sulfonated polyesters and acrylic copolymers to obtain safety approval in accordance with the German or European Cosmetics Regulation. The object of the present invention therefore was to provide an improved method of treating hair sections with a hair colouring composition (HCC), wherein the method does not retain the disadvantages of the prior art or only in diminished form, and which can be carried out at relatively low costs.

[0014] SUMMARY OF THE INVENTION

[0015] This object is achieved by a method of treating hair, wherein the method comprises the following steps a) applying an adhesive composition (AC) on at least partially dry hair sections (SD), wherein the adhesive composition (AC) comprises as component (A) at least one polyurethane and as component (B) at least one cosmetically acceptable carrier, b) drying the adhesive composition (AC) to form hair sections (Sc) coated with the adhesive composition (AC), c) applying a hair colouring composition (HCC) onto the remaining hair which is not coated with the adhesive composition (AC) and, optionally, onto the hair sections (Sc) coated with the adhesive composition (AC), d) leaving the hair colouring composition (HCC) on the hair, and e) subsequently rinsing both the adhesive composition (AC) and the hair colouring composition (HCC) from the hair.

[0016] It has surprisingly been found that, by the inventive method, it is possible to colour selected sections or strands of hair safely, quickly and cost-effectively.

[0017] The adhesive composition (AC) advantageously prevents or alters bleaching or dyeing effects on the hair sections (Sc) coated with the adhesive composition (AC) when contacting these hair sections (Sc) with a hair colouring composition (HCC). In this way, interesting and creative colour effects like multi shades effects can be achieved in the hair and / or porous and thin hair sections or strands can be protected from further breakage through the, often aggressive, hair colouring composition (HCC). Furthermore, the hair sections (Sc) coated with the adhesive composition (AC) can also be protected from bleeding in case a bleaching composition (BC) is applied as hair colouring composition (HCC).

[0018] Beyond that, the adhesive composition (AC) dries fast and can be easily rinsed by water and, optionally, shampoo. Moreover, by using the adhesive composition (AC), it is no longer necessary to use aluminium foils for colouring hair sections or strands which reduces time, waste and costs.

[0019] In addition, there are no problems to obtain safety approval in accordance with the German or European Cosmetics Regulation for the adhesive composition (AC) comprising as component (A) at least one polyurethane and as component (B) at least one cosmetically acceptable carrier.

[0020] DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention will be described in more detail hereinafter.

[0022] Method of treating hair

[0023] The method of treating hair comprises the steps a) to e).

[0024] Step a)

[0025] In step a), an adhesive composition (AC) is applied on at least partially dry hair sections (SD), wherein the adhesive composition (AC) comprises as component (A) at least one polyurethane and as component (B) at least one cosmetically acceptable carrier.

[0026] The term “at least partially dry hair sections (SD)” in the context of the present invention means that the adhesive composition (AC) is applied on completely dry to towel-dry hair sections (SD).

[0027] The at least partially dry hair sections (SD) may be selected from the group consisting of a plurality of tips of the hair fibers, a plurality of roots of the hair fibers, a plurality of parts of the hair fibers across the length of the respective hair fibers, the whole length of one or more hair fibers, and combinations thereof.

[0028] The adhesive composition (AC) may be applied with an application tool for a relatively easy and overall or localized application. The adhesive composition (AC) can be applied using any suitable application tools known to a skilled person. Preferably, the adhesive composition (AC) is applied using a tool for precise application selected from the group consisting of a slim nozzle applicator, a sponge brush applicator, a spatula, and a fine paintbrush applicator, and combinations thereof.

[0029] A slim nozzle applicator allows the provision of filigree patterns as lines and dots. A sponge brush applicator can adhere to a sufficient amount of the adhesive composition (AC), so that the application of the adhesive composition (AC) is relatively easy for relatively extensive and broad patterns.

[0030] A spatula may be another alternative to draw a plurality of fine lines.

[0031] With a fine paintbrush applicator all types of pattern of the adhesive composition (AC) may be achieved.

[0032] In addition, the application tool is preferably chosen in dependence with the rheology of the adhesive composition (AC).

[0033] Therefore, another object of the present invention is a method, wherein, in step a), the adhesive composition (AC) is applied using a tool for precise application selected from the group consisting of a slim nozzle applicator, a sponge brush applicator, a spatula, and a fine paintbrush applicator, and combinations thereof.

[0034] Adhesive

[0035] According to the present invention, the adhesive composition (AC) comprises as component (A) at least one polyurethane and as component (B) at least one cosmetically acceptable carrier.

[0036] In the context of the present invention the terms “component (A)” and “at least one polyurethane” are used synonymously and therefore have the same meaning.

[0037] The same applies to the terms “component (B)” and “at least one cosmetically acceptable carrier”. These terms are likewise used synonymously in the context of the present invention and therefore have the same meaning.

[0038] The adhesive composition (AC) may comprise components (A) and (B) in any desired amounts.

[0039] For example, the adhesive composition (AC) can comprise in the range from 10 to 50 % by weight of component (A), based on the total weight of the adhesive composition (AC).

[0040] Therefore, another object of the present invention is a method, wherein the adhesive composition (AC) comprises in the range from 10 to 50 % by weight of component (A), based on the total weight of the adhesive composition (AC). Accordingly, the adhesive composition (AC) can also comprise, for example, in the range from 50 to 90 % by weight of component (B), based on the total weight of the adhesive composition (AC).

[0041] The adhesive composition (AC) may further comprise at least one additive (C).

[0042] The present invention therefore also provides an adhesive composition (AC) comprising the following components:

[0043] (A) at least one polyurethane,

[0044] (B) at least one cosmetically acceptable carrier, and

[0045] (C) optionally at least one additive.

[0046] In the context of the present invention the terms “component (C)” and “at least one additive” are used synonymously and therefore have the same meaning.

[0047] The adhesive composition (AC) may for example comprise component (C) in a range from 0 to 20 % by weight, preferably in a range from 0.1 to 15 by weight, based on the total weight of the adhesive composition (AC).

[0048] Therefore, another object of the present invention is a method, wherein the adhesive composition (AC) comprises in the range from 0 to 20 % by weight of component (C), based on the total weight of the adhesive composition (AC).

[0049] The at least one additive (C) may be selected from the group consisting of surfactants, conditioning agents, preservatives, colourants, fragrances, thickening agents, and rheology modifiers.

[0050] Therefore, another object of the present invention is a method, wherein the adhesive composition (AC) further comprises at least one additive (C) selected from the group consisting of surfactants, conditioning agents, preservatives, colourants, fragrances, thickening agents, and rheology modifiers.

[0051] In a preferred embodiment, the adhesive composition (AC) comprises in the range from 10 to 50 % by weight of component (A), in the range from 50 to 90 % by weight of component (B) and in the range from 0 to 20 % by weight of component (C), based on the total weight of the adhesive composition (AC).

[0052] In a more preferred embodiment, the adhesive composition (AC) comprises in the range from 20 to 40 % by weight of component (A), in the range from 60 to 80 % by weight of component (B) and in the range from 0 to 20 % by weight of component (C), based on the total weight of the adhesive composition (AC). The percentages by weight of components (A), (B) and optionally (C) typically add up to 100% by weight.

[0053] The adhesive composition (AC) preferably has a viscosity in the range from 50 to 10 000 mPas at a temperature range of from 25 to 40°C, determined according to DIN EN 12092.

[0054] Therefore, another object of the present invention is a method, wherein the adhesive composition (AC) has a viscosity in the range from 50 to 10 000 mPas at a temperature range of from 25 to 40°C, determined according to DIN EN 12092.

[0055] Preferably, the adhesive composition (AC) has a pH from 7 to 10, more preferably from 8 to 9, determined according to DIN ISO 976.

[0056] Therefore, another object of the present invention is a method, wherein the adhesive composition (AC) has a pH from 7 to 10, determined according to DIN ISO 976.

[0057] Component (A) / Polyurethane

[0058] According to the invention, component (A) is at least one polyurethane.

[0059] In the context of the present invention, “at least one polyurethane (A)” means either exactly one polyurethane (A) or a mixture of two or more polyurethanes (A).

[0060] In a preferred embodiment, component (A) is one polyurethane.

[0061] The at least one polyurethane (A) generally has at least one glass transition temperature (TG). The at least one glass transition temperature (TG) of component (A) is preferably in the range from -20 °C to 70 °C. The glass transition temperature (TG) of the polyurethane (A) is determined by means of DSC.

[0062] In a preferred embodiment, the at least one polyurethane (A) has a first glass transition temperature (TG1) in the range from -15 °C to 0 °C, preferably in the range from -6 °C to -10 °C, and a second glass transition temperature (TG2) in the range from 50 °C to 65 °C, preferably in the range from 55 °C to 60 °C.

[0063] Therefore, another object of the present invention is a method, wherein the at least one polyurethane (A) has at least one glass transition temperature (TG) in the range from - 20 °C to 70 °C.

[0064] Suitable components (A) have a weight-average molecular weight (MW(A)) in the range from 5 000 to 20 000 g / mol, preferably in the range from 10 000 to 15 000 g / mol. Therefore, another object of the present invention is a method, wherein the at least one polyurethane (A) has a weight-average molecular weight Mwin the range from 5 000 to 20 000 g / mol.

[0065] The at least one polyurethane may be prepared by any method known to a person skilled in the art.

[0066] In a preferred embodiment, the at least one polyurethane (A) is prepared by a polyaddition reaction of isophorone diisocyanate, neopentyl glycol, a first polyesterdiol, a second polyesterdiol and dimethylol propionic acid (DM PA).

[0067] Therefore, another object of the present invention is a method, wherein the at least one polyurethane (A) is prepared by a polyaddition reaction of isophorone diisocyanate, neopentyl glycol, a first polyesterdiol, a second polyesterdiol and dimethylol propionic acid (DMPA).

[0068] The first polyesterdiol is preferably a polyesterdiol prepared by a reaction of adipic acid, isophthalic acid and 1 ,6-hexane diol, and the second polyesterdiol is preferably prepared by a reaction of adipic acid, neopentyl glycol and 1 ,6-hexane diol.

[0069] Therefore, another object of the present invention is a method, wherein the first polyesterdiol is a polyesterdiol prepared by a reaction of adipic acid, isophthalic acid and 1 ,6-hexane diol, and the second polyesterdiol is prepared by a reaction of adipic acid, neopentyl glycol and 1,6-hexane diol.

[0070] After the polyaddition reaction, the resulting polyurethane (A) is preferably neutralized by aminomethyl propanol.

[0071] Component (B) / Cosmetically acceptable carrier

[0072] According to the invention, component (B) is at least one cosmetically acceptable carrier.

[0073] In the context of the present invention, “at least one cosmetically acceptable carrier (B)” means either exactly one cosmetically acceptable carrier (B) or a mixture of two or more cosmetically acceptable carriers (B).

[0074] In the context of the present invention, the term “cosmetically acceptable” means that the carrier is suitable for use in contact with human keratinous tissue without undue toxicity, incompatibility, instability, allergic response, and the like. The at least one cosmetically acceptable carrier (B) may be selected from either an aqueous medium or an aqueous-alcoholic medium, preferably from an aqueous- alcoholic medium.

[0075] In a preferred embodiment, the at least one cosmetically acceptable carrier (B) therefore comprises the following components

[0076] (B1) at least one alcohol and

[0077] (B2) water.

[0078] Therefore, another object of the present invention is a method, wherein the at least one cosmetically acceptable carrier (B) comprises the following components

[0079] (B1) at least one alcohol and

[0080] (B2) water.

[0081] For example, the adhesive composition (AC) comprises 5 to 15 % by weight of component (B1) and 45 to 75 % by weight of component (B2), each based on the total weight of the adhesive composition (AC).

[0082] Therefore, another object of the present invention is a method, wherein the adhesive composition (AC) comprises 20 to 40 % by weight of component (A), 5 to 15 % by weight of component (B1) and 45 to 75 % by weight of component (B2), each based on the total weight of the adhesive composition (AC).

[0083] The at least one alcohol (B1) can be selected from the group consisting of ethanol, isopropanol, propanol, and mixtures thereof. In a preferred embodiment, the at least one alcohol (B1) is ethanol.

[0084] Therefore, another object of the present invention is a method, wherein the at least one alcohol (B1) is ethanol.

[0085] Component (C) / Additive

[0086] According to the invention, component (C) is at least one additive.

[0087] In the context of the present invention, “at least one additive (C)” means either exactly one additive (C) or a mixture of two or more additives (C).

[0088] As mentioned above, the at least one additive (C) may be selected from the group consisting of surfactants, conditioning agents, preservatives, colourants, fragrances, thickening agents, and rheology modifiers. Surfactants may be selected from the group consisting of anionic, cationic, amphoteric and non-ionic surfactants.

[0089] Conditioning agents may be selected from the group consisting of silicones and derivatives thereof, polyquaternium salts and derivatives thereof, natural botanical oils and derivatives thereof.

[0090] Preservatives may be selected from the group consisting of organic acids such as para-hydroxybenzoic acid; organic acid salts such as sodium benzoate; compounds such as benzyl alcohol, phenoxyethanol, 1 ,3-bis(hydroxymethyl)-5,5- dimethylimidazolidine-2, 4-dione; capryl glycol, and mixtures thereof.

[0091] The fragrances may be selected from animal fragrances or plant fragrances. The animal fragrances may be selected from the group consisting of musk oil, civet, castoreum, ambergris, and mixtures thereof.

[0092] The plant fragrances may be selected from the group consisting of nutmeg extract, cardomon extract, ginger extract, cinnamon extract, patchouli oil, geranium oil, orange oil, mandarin oil, orange flower extract, cedarwood, vetyver, lavandin, ylang extract, tuberose extract, sandalwood oil, bergamot oil, rosemary oil, spearmint oil, peppermint oil, lemon oil, lavender oil, citronella oil, chamomille oil, clove oil, sage oil, neroli oil, labdanum oil, eucalyptus oil, verbena oil, mimosa extract, narcissus extract, carrot seed extract, jasmine extract, olibanum extract, rose extract, and mixtures thereof.

[0093] A person skilled in the art will take care to select the optional additives (C) and the amount thereof such that they do not harm the properties of the adhesive composition (AC) according to the present invention.

[0094] Preferably, the adhesive composition (AC) comprises component (C) in a range from 0 to 20 % by weight, preferably in a range from 0.1 to 15 % by weight, based on the total weight of the adhesive composition (AC).

[0095] Step b)

[0096] In step b), the adhesive composition (AC) is dried to form hair sections (Sc) coated with the adhesive composition (AC).

[0097] The period, during which the adhesive composition (AC) dries, depends, for example, on the concentration of the at least one polyurethane (A), the used amount of the adhesive composition (AC) and the used application tool.

[0098] Preferably, in step b), the adhesive composition (AC) is dried for a period in the range from > 1 minute to < 35 minutes. Therefore, another object of the present invention is a method, wherein, in step b), the adhesive composition (AC) is dried for a period in the range from > 1 to < 35 minutes.

[0099] The adhesive composition (AC) can air dry. However, it is also possible to carry out drying by a hair dryer, or a blow dryer, or a hood device, preferably by a hair dryer or a hood device. Hair dryer or blow dryer distances between device and heads may be typically at a distance of 20 or 30 or 40 centimetres, at a temperature between 50°C and 100°C.

[0100] Step c)

[0101] In step c), a hair colouring composition (HCC) is applied onto the remaining hair which is not coated with the adhesive composition (AC) and, optionally, onto the hair sections (Sc) coated with the adhesive composition (AC).

[0102] Hair colouring composition (HCC)

[0103] The hair colouring composition (HCC) can be any hair colouring composition known to a person skilled in the art.

[0104] Preferably, the hair colouring composition (HCC) is a direct dye, an oxidative hair colouring composition (OHCC) or a bleaching composition (BC).

[0105] In one embodiment, the hair colouring composition (HCC) is plant-based.

[0106] Therefore, another object of the present invention is a method, wherein the hair colouring composition (HCC) is a direct dye, an oxidative hair colouring composition (OHCC) or a bleaching composition (BC).

[0107] The direct dye may be at least one direct dye selected from the group consisting of nitro dyes to provide a blue color, nitro dyes to provide either a red color or a yellow color, quinone dyes, basic dyes, neutral azo dyes, acid dyes, and mixtures thereof.

[0108] Preferably, the at least one direct dye may be selected from the group consisting of Acid dyes such as Acid Yellow 1, Acid Orange 3, Acid Black 1 , Acid Black 52, Acid Orange 7, Acid Red 33, Acid Yellow 23, Acid Blue 9, Acid Violet 43, HC Blue 16, Acid Blue 62, Acid Blue 25, Acid Red 4; Basic Dyes such as Basic Brown 17, Basic Red 118, Basic Orange 69, Basic Red 76, Basic Brown 16, Basic Yellow 57, Basic Violet 2, Basic Violet 14, Basic Blue 7, Basic Blue 26, Basic Red 2, Basic Blue 99, Basic Yellow 29, Basic Red 51 , Basic Orange 31 , Basic Yellow 87, Basic Blue 124, 4-(3-(4-amino- 9,10-dioxo-9,10-dihydroanthracen-1-ylamino)propyl)-4-methylmorpholin-4-ium- methylsulfate, (E)-1-(2-(4-(4,5-dimethylthiazol-2-yl)diazenyl)phenyl)(ethyl)amino)ethyl)- 3-methyl-1H-imidazol-3-ium chloride, (E)-4-(2-(4-(dimethylamino)phenyl)diazenyl)-1- methyl-1H-imidazol-3-ium-3-yl)butane-1 -sulfonate, (E)-4-(4-(2-methyl-2- phenylhydrazono)methyl)pyridinium-1-yl)butane-1-sulfonate, N,N-dimethyl-3-(4- (methylamino)-9,10-dioxo-4a,9,9a, 10-tetrahydroanthracen-1-ylamino)-N-propylpropan- 1-aminium bromide; Disperse Dyes such as Disperse Red 17, Disperse Violet 1, Disperse Red 15, Disperse Black 9, Disperse Blue 3, Disperse Blue 23, Disperse Blue 377; Nitro Dyes such as 1-(2-(4-nitrophenylamino)ethyl)urea, 2-(4-methyl-2- nitrophenylamino)ethanol, 4-nitrobenzene-1 ,2-diamine, 2-nitrobenzene-1 ,4-diamine, Picramic acid, 2-hydroxyethyl Picramic acid, HC Red No. 13, 2,2'-(2-nitro-1 ,4- phenylene)bis(azanediyl)diethanol, HC Yellow No. 5, HC Red No. 7, HC Blue No.2, HC Yellow No. 4, HC Yellow No. 2, HC Orange No. 1 , HC Red No. 1, 2-(4-amino-2-chloro- 5-nitrophenylamino)ethanol, HC Red No. 3, 4-amino-3-nitrophenol, 4-(2- hydroxyethylamino)-3-nitrophenol, 2-amino-3-nitrophenol, 2-(3-(methylamino)-4- nitrophenoxy)ethanol, 3-(3-amino-4-nitrophenyl)propane-1,2-diol, HC Yellow No. 11, HC Violet No. 1 , HC Orange No. 2, HC Orange No. 3, HC Yellow No. 9, HC Red No. 10, HC Red No. 11 , 2-(2-hydroxyethylamino)-4,6-dinitrophenol, HC Blue No. 12, HC Yellow No. 6, HC Yellow No. 12, HC Blue No. 10, HC Yellow No. 7, HC Yellow No. 10, HC Blue No. 9, 2-chloro-6-(ethylamino)-4-nitrophenol, 6-nitropyridine-2,5-diamine, HC Violet No. 2, 2-amino-6-chloro-4-nitrophenol, 4-(3-hydroxypropylamino)-3-nitrophenol, HC Yellow No. 13, 6-nitro-1,2,3,4-tetrahydroquinoxaline, HC Red No. 14, HC Yellow No. 15, HC Yellow No. 14, N2-methyl-6-nitropyridine-2,5-diamine, N1-allyl-2- nitrobenzene-1,4-diamine, HC Red No. 8, HC Green No.1, HC Blue No. 14, HC Blue No. 16; Natural dyes such as Annato, Anthocyanin, Beetroot, Carotene, Capsanthin, Lycopene, Chlorophyll, Henna, Indigo, Cochineal; and mixtures thereof.

[0109] The oxidative hair colouring composition (OHCC) or the bleaching composition (BC) preferably comprises at least one oxidizing agent (HD) selected from the group consisting of hydrogen peroxide, urea peroxide, alkali metal bromates, peroxygenated salts, peracids, percarbonates, persulfates and precursors thereof, and mixtures thereof.

[0110] The oxidative hair colouring composition (OHCC) preferably comprises as components

[0111] (HA) at least one oxidative coupler dye precursor,

[0112] (HB) at least one oxidative primary dye precursor,

[0113] (HC) at least one alkalizing agent, and

[0114] (HD) at least one oxidizing agent.

[0115] The oxidizing agent (HD) is preferably as described above, wherein hydrogen peroxide is especially preferred. For the at least one oxidative coupler dye precursor (HA), the at least one oxidative primary dye precursor (HB), and the at least one alkalizing agent (HC) commonly known components in the field of hair colouring and hair bleaching can be used.

[0116] In one embodiment, the at least one alkalizing agent (HC) is at least one alkalizing agent selected from the group consisting of ammonia and alkanolamines. In one embodiment, the alkanolamines are selected from the group consisting of monoethanolamine, propanolamine, isopropanolamine, 2-amino-2-methyl-1-propanol, 2-amino-1-propanol, 2-amino-1-butanol, 1-amino-2-propanol, 3-amino-1-propanol, 2- aminopropane-1,3-diol, 1-amino-2-butanol, 4-amino-2-butanol, 4-amino-1-butanol, 3- amino-1-butanol, 3-amino-2-butanol, 2-amino-1-butanol, dimethyl glucamine, 2,5- diaminocyclohexane-1 ,4-diol, 2-aminocycohexan-1-ol, 2,4,6-triaminocyclohexane-

[0117] 1.3.5-triol , 2-amino-2-methyl-1 ,3-popanediol, 2-amino-1-hydroxylmethyl-1 ,3- propanediol and 2-dimethylamino-2-methyl-1-propanol. In a preferred embodiment, the at least one alkalizing agent (A) is selected from the group consisting of ammonia, monoethanolamine, propanolamine, isopropanolamine and 2-amino-1 -propanol; more preferably the at least one alkalizing agent (A) is monoethanolamine and / or ammonia.

[0118] In one embodiment of the at least one oxidative primary dye precursors (HB), is at least one oxidative primary dye precursors selected from of the group consisting of toluene-

[0119] 2.5-diamine, p-phenylenediamine, n-phenyl-p-phenylenediamine, N,N-bis(2- hydroxyethyl)-p-phenylenediamine, hydroxyethyl-p-phenylenediamine sulphate, hydroxypropyl bis(n-hydroxyethyl-p-phenylenediamine), 2-methoxymethyl-p- phenylenediamine, 2-chloro-p-phenylenediamine, p-aminophenol, p- methylaminophenol, 4-amino-m-cresol, 6-amino-m-cresol, bis(5-amino-2- hydroxyphenyl)methane, tetraaminopyrimidine, 2,5,6-triamino-4-pyrimidinol, 4,5- diamino-1-(2-hydroxyethyl)pyrazol 2,3-diaminodihydroxypyrazolopyrazolone dimethosulfonate, 4,5-diamino-1-hexylpyrazol, hydroxypropyl-p-phenylenediamine, dimethylpiperazinium aminopyrazolopyridine chloride hydrochloride, methyl- imidazoliumpropyl p-phenylenediamine, hydroxyethoxy aminopyrazolopyridine and salts thereof.

[0120] In one embodiment the at least one oxidative coupler dye precursors (HA) is at least one oxidative coupler dye precursors selected from the group consisting of resorcinol, 4-chlororesorcinol, 2-chlororesorcinol, 2-methylresorcinol, m-aminophenol, 4-amino-2- hydroxytoluene, 2-methyl-5-hydroxyethylaminophenol, 3-amino-2,6-dimethylphenol, 3- amino-2,4-dichlorophenol, 5-amino-6-chloro-o-cresol, 5-amino-4-chloro-o-cresol, hydroxybenzo-rnorpholine, 2-amino-5-ethylphenol, 6-amino-m-cresol, 6-amino-o- cresol, 2,4-diaminophenoxyethanol, 2-amino-4-hydroxyethylaminoanisole, 1 ,3-bis-(2,4- diamino_,phenoxy)propane, 2,6-dihydroxyethylaminotoluenep, m-phenylenediamine,

[0121] 2.4-diamino-1 ,5-di(2-hydroxyethoxybenzene, 1 -naphthol, 2-methyl-1 -naphthol, 1,5- naphthalenediol, 2,7-naphthalenediol, 1-acetoxy-2-methylnaphthalene, 2,6-dihydroxy-

[0122] 3.4-dimethylpyridine, 2,6-dimethoxy-3,5-pyridinediamine, 3-amino-6-methoxy-2- (methylamino)-pyridine, 2-amino-3-hydroxypyridine, 2,6-diaminopyridine, dihydroxyindole, 6-hydroxyindole, dihydroxyindoline, phenyl methyl pyrazolone, 1,2,4- trihydroxybenzene, 5-((2-hydroxyethyl)amino)-1,3-benzodioxol, isatin, hydroquinone, 4- formyl-1-methylquinolinium-p-toluenesulfonate, resveratrol and salts thereof.

[0123] The oxidative hair colouring composition (OHCC) can also comprise at least one direct dye, preferably at least one oxidatively stable direct dye.

[0124] Step d)

[0125] In step d), the hair colouring composition (HCC) is left on the hair.

[0126] It is clear for a skilled person that during step d), the remaining hair which is not coated with the adhesive composition (AC) is coloured.

[0127] The time in which the hair colouring composition (HCC) is left on the hair depends on the results to be achieved, the hair colouring composition (HCC), and the technique. Preferably, in step d), the hair colouring composition (HCC) is left on the hair for a period from 5 to 50 minutes, more preferably from 10 to 45 minutes, most preferably from 20 to 40 minutes.

[0128] When leaving the hair colouring composition (HCC) for a relatively short time from 5 to 10 minutes, as a result, the hair shows a glossing final shade. When leaving the hair colouring composition (HCC) for a time from 35 to 50 minutes, as a result the hair shows a full coloration.

[0129] Step e)

[0130] In step e), subsequently, the adhesive composition (AC) and the hair colouring composition (HCC) both are rinsed from the hair.

[0131] Preferably, the adhesive composition (AC) and the hair colouring composition (HCC) both are rinsed from the hair by using a standard shampoo.

[0132] In a preferred embodiment, after rinsing, the hair is cared with conditioner.

[0133] In one preferred embodiment, in a first step, the adhesive composition (AC) and the hair colouring composition (HCC) both are rinsed from the hair with water and the hair is emulsified thoroughly with water. Then, in a second step, the remaining adhesive composition (AC) and the remaining hair colouring composition (HCC) both are rinsed from the hair by using a standard shampoo, and, in a third step, the hair is post-colour treated, for example, by using a conditioner. Use of the adhesive

[0134] The adhesive composition (AC) comprising at least one polyurethane (A), and at least one cosmetically acceptable carrier (B) can be used for preventing or altering bleaching or dyeing effects on hair when contacting the hair with a hair colouring composition (HCC).

[0135] Therefore, another object of the present invention is the use of an adhesive composition (AC) comprising at least one polyurethane (A), and at least one cosmetically acceptable carrier (B) for preventing or altering bleaching or dyeing effects on hair when contacting the hair with a hair colouring composition (HCC).

[0136] The grade of preventing or altering depends, for example, on the dilution factor of the adhesive composition (AC).

[0137] Reference signs

[0138] AC adhesive composition

[0139] SDat least partially dry hair sections

[0140] A at least one polyurethane

[0141] B at least one cosmetically acceptable carrier

[0142] Schair sections coated with the adhesive composition

[0143] HCC hair colouring composition

[0144] B1 at least one alcohol

[0145] B2 water

[0146] C at least one additive

[0147] TGglass transition temperature

[0148] Mwweight-average molecular weight

[0149] OHCC oxidative hair colouring composition

[0150] BC bleaching composition

[0151] Embodiments

[0152] In the following, there is provided a list of embodiments to further illustrate the present disclosure without intending to limit the disclosure to the specific embodiments listed below.

[0153] 1. A method of treating hair, wherein the method comprises the following steps a) applying an adhesive composition (AC) on at least partially dry hair sections (SD), wherein the adhesive composition (AC) comprises as component (A) at least one polyurethane and as component (B) at least one cosmetically acceptable carrier, b) drying the adhesive composition (AC) to form hair sections (Sc) coated with the adhesive composition (AC), c) applying a hair colouring composition (HCC) onto the remaining hair which is not coated with the adhesive composition (AC) and, optionally, onto the hair sections (Sc) coated with the adhesive composition (AC), d) leaving the hair colouring composition (HCC) on the hair, and e) subsequently rinsing both the adhesive composition (AC) and the hair colouring composition (HCC) from the hair. The method according to embodiment 1 , wherein the at least one cosmetically acceptable carrier (B) comprises the following components

[0154] (B1) at least one alcohol and

[0155] (B2) water. The method according to embodiment 1 or 2, wherein the adhesive composition (AC) further comprises at least one additive (C) selected from the group consisting of surfactants, conditioning agents, preservatives, colourants, fragrances, thickening agents, and rheology modifiers. The method according to any one of embodiments 1 to 3, wherein the adhesive composition (AC) comprises in the range from 10 to 50 % by weight of component (A), based on the total weight of the adhesive composition (AC). The method according to any one of embodiments 2 to 4, wherein the adhesive composition (AC) comprises 20 to 40 % by weight of component (A), 5 to 15 % by weight of component (B1) and 45 to 75 % by weight of component (B2), each based on the total weight of the adhesive composition (AC). The method according to any one of embodiments 1 to 5, wherein the adhesive composition (AC) has a pH from 7 to 10, determined according to DIN ISO 976. The method according to any one of embodiments 1 to 6, wherein the at least one polyurethane (A) has i) at least one glass transition temperature (TG) in the range from -20 °C to 70 °C, and / or ii) a weight-average molecular weight (Mw) in the range from 5 000 to 20 000 g / mol.

[0156] 8. The method according to any one of embodiments 1 to 7, wherein the adhesive composition (AC) has a viscosity in the range from 50 to 10 000 mPas at a temperature range of from 25 to 40°C, determined according to DIN EN 12092.

[0157] 9. The method according to any one of embodiments 1 to 8, wherein the at least one polyurethane (A) is prepared by a polyaddition reaction of isophorone diisocyanate, neopentyl glycol, a first polyesterdiol, a second polyesterdiol and dimethylol propionic acid (DMPA).

[0158] 10. The method according to claim 9, wherein the first polyesterdiol is a polyesterdiol prepared by a reaction of adipic acid, isophthalic acid and 1,6- hexane diol, and the second polyesterdiol is prepared by a reaction of adipic acid, neopentyl glycol and 1,6-hexane diol.

[0159] 11. The method according to any one of embodiments 2 to 10, wherein the at least one alcohol (B1) is selected from the group consisting of ethanol, isopropanol, propanol, and mixtures thereof.

[0160] 12. The method according to any one of embodiments 1 to 11, wherein, in step b), the adhesive composition (AC) is dried for a period in the range from > 1 minute to < 35 minutes.

[0161] 13. The method according to any one of embodiments 1 to 12, wherein the hair colouring composition (HCC) is a direct dye, an oxidative hair colouring composition (OHCC) or a bleaching composition (BC).

[0162] 14. The method according to any one of embodiments 3 to 13, wherein the adhesive composition (AC) comprises in the range from 0 to 20 % by weight of component (C), based on the total weight of the adhesive composition (AC).

[0163] 15. The method according to any one of embodiments 1 to 14, wherein, in step a), the adhesive composition (AC) is applied using a tool for precise application selected from the group consisting of a slim nozzle applicator, a sponge brush applicator, a spatula, and a fine paintbrush applicator, and combinations thereof.

[0164] 16. The method according to embodiment 11, wherein the at least one alcohol (B1) is ethanol. The method according to embodiment 13, wherein the oxidative hair colouring composition (OHCC) or the bleaching composition (BC) comprises at least one oxidizing agent (HD) selected from the group consisting of hydrogen peroxide, urea peroxide, alkali metal bromates, peroxygenated salts, peracids, percarbonates, persulfates and precursors thereof, and mixtures thereof. The method according to any one of embodiments 1 to 17, wherein, in step d), the hair colouring composition (HCC) is left on the hair for a period from 5 to 50 minutes, preferably from 10 to 45 minutes, more preferably from 20 to 40 minutes. The method according to any one of embodiments 1 to 18, wherein, in step b), the adhesive composition (AC) air dries. The method according to any one of embodiments 1 to 18, wherein, in step b), drying of the adhesive composition (AC) is carried out by a hair dryer, or a blow dryer, or a hood device. The use of an adhesive composition (AC) comprising at least one polyurethane (A), and at least one cosmetically acceptable carrier (B) for preventing or altering bleaching or dyeing effects on hair when contacting the hair with a hair colouring composition (HCC).

Claims

Claims1. A method of treating hair, wherein the method comprises the following steps e) applying an adhesive composition (AC) on at least partially dry hair sections (SD), wherein the adhesive composition (AC) comprises as component (A) at least one polyurethane and as component (B) at least one cosmetically acceptable carrier, f) drying the adhesive composition (AC) to form hair sections (Sc) coated with the adhesive composition (AC), g) applying a hair colouring composition (HCC) onto the remaining hair which is not coated with the adhesive composition (AC) and, optionally, onto the hair sections (Sc) coated with the adhesive composition (AC), h) leaving the hair colouring composition (HCC) on the hair, and i) subsequently rinsing both the adhesive composition (AC) and the hair colouring composition (HCC) from the hair.

2. The method according to claim 1 , wherein the at least one cosmetically acceptable carrier (B) comprises the following components(B1) at least one alcohol and(B2) water.

3. The method according to claim 1 or 2, wherein the adhesive composition (AC) further comprises at least one additive (C) selected from the group consisting of surfactants, conditioning agents, preservatives, colourants, fragrances, thickening agents, and rheology modifiers.

4. The method according to any one of claims 1 to 3, wherein the adhesive composition (AC) comprises in the range from 10 to 50 % by weight of component (A), based on the total weight of the adhesive composition (AC).

5. The method according to any one of claims 2 to 4, wherein the adhesive composition (AC) comprises 20 to 40 % by weight of component (A), 5 to 15 % by weight of component (B1) and 45 to 75 % by weight of component (B2), each based on the total weight of the adhesive composition (AC).

6. The method according to any one of claims 1 to 5, wherein the adhesive composition (AC) has a pH from 7 to 10, determined according to DIN ISO 976.

7. The method according to any one of claims 1 to 6, wherein the at least one polyurethane (A) has iii) at least one glass transition temperature (TG) in the range from -20 °C to 70 °C, and / or iv) a weight-average molecular weight (Mw) in the range from 5 000 to 20 000 g / mol.

8. The method according to any one of claims 1 to 7, wherein the adhesive composition (AC) has a viscosity in the range from 50 to 10 000 mPas at a temperature range of from 25 to 40°C, determined according to DIN EN 12092.

9. The method according to any one of claims 1 to 8, wherein the at least one polyurethane (A) is prepared by a polyaddition reaction of isophorone diisocyanate, neopentyl glycol, a first polyesterdiol, a second polyesterdiol and dimethylol propionic acid (DMPA).

10. The method according to claim 9, wherein the first polyesterdiol is a polyesterdiol prepared by a reaction of adipic acid, isophthalic acid and 1,6- hexane diol, and the second polyesterdiol is prepared by a reaction of adipic acid, neopentyl glycol and 1 ,6-hexane diol.

11. The method according to any one of claims 2 to 10, wherein the at least one alcohol (B1) is ethanol.

12. The method according to any one of claims 1 to 11 , wherein, in step b), the adhesive composition (AC) is dried for a period in the range from > 1 minute to < 35 minutes.

13. The method according to any one of claims 1 to 12, wherein the hair colouring composition (HCC) is a direct dye, an oxidative hair colouring composition (OHCC) or a bleaching composition (BC).

14. The method according to any of claims 3 to 13, wherein the adhesive composition (AC) comprises in the range from 0 to 20 % by weight of component (C), based on the total weight of the adhesive composition (AC).

15. The method according to any one of claims 1 to 14, wherein, in step a), the adhesive composition (AC) is applied using a tool for precise application selected from the group consisting of a slim nozzle applicator, a sponge brush applicator, a spatula, and a fine paintbrush applicator, and combinations thereof.

16. The use of an adhesive composition (AC) comprising at least one polyurethane (A), and at least one cosmetically acceptable carrier (B) for preventing or altering bleaching or dyeing effects on hair when contacting the hair with a hair colouring composition (HCC).

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