Natural dye coloring with improved color intensity

Abstract

The invention relates to a method for dyeing keratin-containing fibers, in particular human hair, using a natural dye on the basis of anthocyans and at least one glycosylase (E.C. 3.2), and to compositions used for carrying out said dyeing method.

Description

[0001] Natural dye coloring with improved color intensity'

[0002] The invention relates to a process for dyeing keratin-containing fibers, in particular human hair, using a natural dye based on anthocyanins and at least one glycosylase (EC 3.2), as well as compositions for carrying out this dyeing process.

[0003] The desire to change one's hair color is a major need for many consumers. To satisfy this need, the cosmetics industry offers a diverse range of products. Hair dyes that achieve particularly long-lasting coloration with high coverage are usually oxidation dyes. These use oxidizing agents that can damage the hair structure. Certain cationic, direct azo dyes are also capable of enabling hair color changes with excellent fastness properties. These azo dyes are synthetic dyes. However, a growing number of consumers desire hair dyes and hair coloring processes based on natural dyes, even if these products and processes are often inferior to the aforementioned products and processes in terms of fastness properties, coverage, and color variety.

[0004] State of the art

[0005] Publication WO2019244920A1 discloses the production of color pigments obtained by pretreating anthocyanin-containing plant parts with cellulase at a pH of 4.5. The enzyme is then washed out, yielding enzyme-free pigments.

[0006] Task

[0007] The object of the present invention was to provide a process for coloring keratin-containing fibers, in particular human hair, using naturally occurring substances. A further object of the present invention was to provide a process for coloring keratin-containing fibers, in particular human hair, using naturally occurring substances, which achieve colorations with good coloring properties, in particular with high color intensity, good wash, light, and / or rubbing fastness, good homogeneity, and good balancing ability, i.e., low selectivity between damaged and undamaged areas along the keratin fibers.

[0008] Surprisingly, it was found that by combining at least one anthocyanin-containing plant part and at least one glycosylase (EC 3.2) located outside the plant part, dye compositions for keratin fibers are obtained which achieve dyeings with good application properties.

[0009] A first subject of the present invention is a method for the non-oxidative coloring of keratin fibers, in particular human hair, in which a composition containing at least one anthocyanin-containing plant part and at least one glycosylase (EC 3.2) located outside the plant part is applied to the keratin fibers and rinsed off again after a contact time.

[0010] Dyeing methods and dyeing compositions according to the invention are characterized in that the at least one glycosylase is located outside the anthocyanin-containing plant part. This means that the at least one glycosylase is provided separately from the composition containing the at least one anthocyanin-containing plant part. The glycosylases provided separately according to the invention therefore do not include those glycosylases that are naturally present in the anthocyanin-containing plant parts used.

[0011] Glycosylases (EC 3.2)

[0012] Without wishing to be bound by this theory, it is assumed that by adding at least one glycosylase (EC 3.2) to a composition containing at least one anthocyanin-containing plant part, the aglycone of the anthocyanin, i.e. the anthocyanidin, is produced in situ, which immediately causes the coloration of the keratin fiber.

[0013] In a preferred embodiment of the invention, the at least one glycosylase (EC 3.2) is selected from at least one glycosidase (EC 3.2.1). Among glycosidases (EC

[0014] 3.2.1) are understood to be enzymes that hydrolyze O-glycosyl components and S-glycosyl components.

[0015] Glycosidases preferred according to the invention (EC 3.2.1) are selected from a group of enzymes generally referred to as cellulases.

[0016] The term "cellulase," as used herein, refers to enzymes that catalyze the hydrolysis of 1,4-beta-D-glucoside bonds present in cellulose (cellobiose) and / or lichenin and / or beta-D-glucans. Cellulases are often also capable of hydrolyzing the 1,4-bonds in beta-D-glucans, which possess 1,3-bonds in addition to the 1,4-bonds. Cellulases are capable of cleaving cellulose into beta-glucose. Consequently, cellulases act particularly on cellulose-containing or cellulose-derivative-containing residues and catalyze their hydrolysis. The decisive factor in determining whether an enzyme is a cellulase within the scope of the invention is its ability to hydrolyze 1,4-beta-D-glucoside bonds in cellulose.

[0017] The term "cellulase activity" is defined here as an enzyme that catalyzes the hydrolysis of 1,4-beta-D-glucoside bonds in beta-1,4-glucan (cellulose). Cellulose activity is measured using a standard method, e.g., as follows: Cellulases release glucose from CMC (carboxymethylcellulose). Samples are incubated with a substrate (1.25 wt% CMC) under defined reaction conditions (100 mM sodium phosphate buffer pH 7.5, 40°C, 15 min). Reaction with p-hydroxybenzoic acid hydrazide (PAHBAH) in the presence of bismuth produces a yellow dye that can be determined photometrically at 410 nm. An alkaline pH value is required during the color reaction. The amount of sugar released corresponding to the color is a measure of enzyme activity (Lever, Anal. Biochem., 1972, 47 & 1977, 81).

[0018] Cellulases can be divided into three categories:

[0019] 1. Endoglucanase (EC 3.2.1.4), also known as endo-1,4-beta-glucanase, beta-1,4-glucanase, avice-lase, beta-1,4-endoglucanhydrolase, endo-1,4-beta-D-glucanohydrolase,

[0020] Carboxymethylcellulase or celludextrinase;

[0021] 2. Cellulose-1,4-beta-cellobiosidase (non-reducing end) (EC 3.2.1.91), also known as exoglucanase, 1,4-beta-cellobiohydrolase, 4-beta-D-glucan cellobiohydrolase (non-reducing end), avicelase, exo-1,4-beta-D-glucanase or exocellobiohydrolase, releases cellobiose from the non-reducing ends of the ß-D-glucan chains by hydrolysis of the (1->4)-beta-D-glucosidic bonds in cellulose and cellotetraose;

[0022] 3. beta-Glucosidase (EC 3.2.1.21), also known as cellobiase, beta-D-glucoside glucohydrolase, amygdalase or gentobiase, hydrolyzes terminal, non-reducing beta-D-glucosyl groups to release beta-D-glucose.

[0023] Suitable cellulases include those of bacterial or fungal origin. Chemically modified or protein-engineered mutants are included. Suitable cellulases are cellulases from the genera Bacillus, Pseudomonas, Humicola, Fusarium, Thielavia, and Acremonium, e.g., the fungal cellulases from Humicola insolens, Myceliophthora thermophila, and Fusarium oxysporum, disclosed in US 4,435,307, US 5,648,263, US 5,691,178, US 5,776,757, and WO 89 / 09259. Particularly suitable cellulases can be alkaline or neutral cellulases with color-care properties. Examples of such cellulases are cellulases described in EP495257, EP531372, WO 96 / 11262, WO 96 / 29397, WO 98 / 08940. Other examples are cellulase variants as described in WO 94 / 07998, EP531315, EP3212777, EP3502243, EP3653705, EP 3653706, US 5457046, US 5686593, US 5763254, WO 95 / 24471, WO 98 / 12307, WO 99 / 01544, and WO 2019 / 122520.Examples of glycosylases and glycosidases with endo-1,4-glucanase activity (EC 3.2.1.4) are described in WO 2002 / 099091, e.g., those with a sequence of at least 97% identity to the amino acid sequence of positions 1 to 773 of SEQ ID NO:2 of WO 2002 / 099091. Another example may comprise a GH44 xyloglucanase, e.g., a xyloglucanase enzyme with a sequence of at least 60% identity to positions 40 to 559 of SEQ ID NO:2 of WO 2001 / 062903.

[0024] Other examples of cellulases suitable according to the invention include the GH45 cellulases described in WO 96 / 29397 and in particular variants thereof with substitution, insertion and / or deletion at one or more of the positions corresponding to the following positions in SEQ ID NO:8 of WO 2002 / 099091: 2, 4, 7, 8, 10, 13, 15, 19, 20, 21, 25, 26, 29, 32, 33, 34, 35, 37, 40, 42, 42a, 43, 44, 48, 53, 54, 55, 58, 59, 63, 64, 65, 66, 67, 70, 72, 76, 79, 80, 82, 84, 86, 88, 90, 91, 93, 95, 95d, 95h, 95j, 97, 100, 101, 102, 103, 113, 114, 117, 119, 121, 133, 136, 137, 138, 139, 140a, 141, 143a, 145, 146, 147, 150e, 150j, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160c, 160e, 160k, 161 , 162, 164, 165, 168, 170, 171, 172, 173, 175, 176, 178, 181, 183, 184, 185, 186, 188, 191, 192, 195, 196, 200, and / or 20, preferably selected from P19A, G20K, Q44K, N48E, Q119H or Q146R.

[0025] Commercially available cellulases include Celluzyme™, Carezyme™, Carezyme Premium™, Celluclean™ (e.g. Celluclean™ 5000L and Cellulclean™ 4000T), Celluclean Classic™, Cellusoft™, Endolase®, Renozyme® and Whitezyme™ (Novozymes A / S), Clazinase™ and Puradax HA™ (Genencor International Inc.), KAC-500(B)™ (Kao Corporation), Revitalenz™ 1000, Revitalenz™ 2000 and Revitalenz™ 3000 (DuPont), as well as Ecostone® and Biotouch® (AB Enzymes).

[0026] In a further preferred embodiment of the invention, the at least one glycosidase (EC 3.2.1) is selected from endo-1,4-beta-glucanase (EC 3.2.1.4), beta-glucosidase (EC 3.2.1.21), exo-1,4-beta-glucosidase (EC 3.2.1.74), cellulose-1,4-beta-cellobiosidase (EC 3.2.1.176), exo-1,4-beta-D-glucanase (EC 3.2.1.91) and oligooxyloglucan-reducing end-specific cellobiohydrolase (EC 3.2.1.150) as well as mixtures of these enzymes.

[0027] In a further preferred embodiment of the invention, the at least one glycosidase (EC 3.2.1) is selected from endo-1,4-beta-glucanase (EC 3.2.1.4), beta-glucosidase (EC 3.2.1.21) and exo-1,4-beta-D-glucanase (EC 3.2.1.91) as well as mixtures of these enzymes.

[0028] A particularly preferred embodiment of the invention is characterized in that the coloring composition contains an enzyme mixture comprising at least one endo-1,4-beta-glucanase (EC 3.2.1.4), at least one beta-glucosidase (EC 3.2.1.21) and at least one enzyme selected from at least one exo-1,4-beta-D-glucanase (EC 3.2.1.91) and at least one oligooxyloglucan-reducing end-specific cellobiohydrolase (EC 3.2.1.150) and mixtures thereof.

[0029] A particularly preferred embodiment of the invention is characterized in that the coloring composition contains an enzyme mixture comprising at least one endo-1,4-beta-glucanase (EC 3.2.1.4), at least one beta-glucosidase (EC 3.2.1.21) and at least one exo-1,4-beta-D-glucanase (EC 3.2.1.91).

[0030] A further particularly preferred embodiment of the invention is characterized in that the coloring composition contains an enzyme mixture comprising at least one endo-1,4-beta-glucanase (EC 3.2.1.4) in a total amount of 20 - 35 wt.%, at least one beta-glucosidase (EC 3.2.1.21) in a total amount of 15 - 25 wt.%, and - in a total amount of 25 - 35 wt.% - at least one enzyme selected from at least one exo-1,4-beta-D-glucanase (EC 3.2.1.91) and at least one oligooxyloglucan-reducing end-specific cellobiohydrolase (EC 3.2.1.150) and mixtures thereof, wherein the amounts refer to the total weight of the enzyme mixture.

[0031] A further particularly preferred embodiment of the invention is characterized in that the coloring composition contains an enzyme mixture comprising at least one endo-1,4-beta-glucanase (EC 3.2.1.4) in a total amount of 20-35% by weight, at least one beta-glucosidase (EC 3.2.1.21) in a total amount of 15-25% by weight and at least one exo-1,4-beta-D-glucanase (EC 3.2.1.91) in a total amount of 25-35% by weight, wherein the amounts refer to the total weight of the enzyme mixture.

[0032] A further particularly preferred embodiment of the invention is characterized in that the coloring composition contains an enzyme mixture comprising at least one endo-1,4-beta-glucanase (EC 3.2.1.4) in a total amount of 20-35% by weight, at least one beta-glucosidase (EC 3.2.1.21) in a total amount of 15-25% by weight, furthermore - in a total amount of 25-35% by weight - at least one enzyme selected from at least one exo-1,4-beta-D-glucanase (EC 3.2.1.91) and at least one oligooxyloglucan-reducing end-specific cellobiohydrolase (EC 3.2.1.150) and mixtures thereof, and in a total amount of up to 100% by weight at least one further enzyme with cellulase activity, wherein the amounts refer to the total weight of the enzyme mixture.

[0033] A further particularly preferred embodiment of the invention is characterized in that the coloring composition contains an enzyme mixture comprising at least one endo-1,4-beta-glucanase (EC 3.2.1.4) in a total amount of 20-35% by weight, at least one beta-glucosidase (EC 3.2.1.21) in a total amount of 15-25% by weight, and at least one exo-1,4-beta-D-glucanase (EC 3.2.1.91) in a total amount of 25-35% by weight, as well as at least one further enzyme with cellulase activity in a total amount of up to 100% by weight, wherein the amounts refer to the total weight of the enzyme mixture.

[0034] A further particularly preferred embodiment of the invention is characterized in that the dyeing composition contains, based on its weight, at least one glycosylase (EC 3.2) in a total amount of 0.0001 - 1 wt.%, preferably 0.001 - 0.1 wt.%, more preferably 0.002 - 0.05 wt.%, particularly preferably 0.003 - 0.04 wt.%, extraordinarily preferably 0.01 - 0.03 wt.%.

[0035] Origin of anthocyanins a) Plants

[0036] A preferred embodiment of the invention is characterized in that the anthocyanin-containing plant used according to the invention is selected from Ribes nigrum, Euterpe oleracea (cabbage palm, agai), Aronia (chokeberry), Malus domestica, Solanum melongena, Fragaria, Vaccinium, Hibiscus, Sambucus nigra, Citrus sinensis, Rubus sect. Rubus, Rubus idaeus, Punus avium, Prunus cerasus, Ribes rubrum, red cabbage (Brassica oleracea convar. capitata var. rubra L.), and Vitis vinifera. Of course, the coloring compositions according to the invention and those used according to the invention can also contain plant parts from two or more different plants. In a particularly preferred embodiment of the invention, the anthocyanin-containing plant used according to the invention is selected from Ribes nigrum. b) Plant Parts

[0037] A preferred embodiment of the invention is characterized in that the anthocyanin-containing plant part is selected from berries, fruits, aggregate nuts, aggregate stone fruits, stone fruits, apple fruits, peels, cones, leaves, stems, branches, bark, trunk wood, seeds or roots of an anthocyanin-containing plant. In a particularly preferred embodiment of the invention, the plant parts used are used in dried and comminuted form. In an extremely preferred embodiment of the invention, berries are used as the anthocyanin-containing plant part, particularly preferably in dried and comminuted form. In a further extremely preferred embodiment of the invention, the berries of Ribes nigrum are used as the anthocyanin-containing plant part, particularly preferably in dried and comminuted form.

[0038] In a further extremely preferred embodiment of the invention, the at least one anthocyanin-containing plant part is used in powder form, particularly preferably as a water-soluble powder. Water solubility is understood here that at least 0.3% by weight, preferably at least 0.5% by weight of the powder dissolves clearly in water at 25°C. In a further preferred embodiment of the invention, the composition used for coloring is characterized in that it contains, based on its weight, at least one anthocyanin-containing plant part in a total amount of 0.05 - 20% by weight, preferably 0.1 - 10% by weight, more preferably 0.5 - 5% by weight, particularly preferably 0.7 - 2% by weight, extremely preferably 1 - 1.5% by weight.

[0039] In a further extremely preferred embodiment of the invention, it is not the at least one anthocyanin-containing plant part itself that is used, but rather an extract of the anthocyanin-containing plant part.

[0040] Plant parts preferred according to the invention from which extracts preferred according to the invention can be obtained are the berries, fruits, aggregate nuts, aggregate stone fruits, stone fruits, apple fruits, peels, cones, leaves, stems, branches, bark, trunk wood, seeds or roots of an anthocyanin-containing plant.

[0041] Suitable extractants are water, in particular hot water at a temperature of 45 - 100 °C, furthermore C1-C4 alkanols and C2-C4 polyols, in particular ethanol, isopropanol, n-propanol, ethylene glycol, 1,2-propanediol, glycerol and 1,3-butylene glycol, and mixtures of these extractants, in particular mixtures of water and at least one C1-C4 alkanol, mixtures of water and at least one C2-C4 polyol, particularly preferably water / ethanol mixtures.

[0042] The extract itself can preferably be used in concentrated form, obtainable by partially distilling off the extractant after extraction, as a viscous liquid. Other extracts preferred according to the invention are used in powder form, obtainable by drying, preferably spray drying, the solvent-containing extract.

[0043] In a further preferred embodiment of the invention, the composition used for coloring is characterized in that it contains, based on its weight, at least one anthocyanin-containing plant part extract in a total amount of 0.005 - 20 wt.%, preferably 0.01 - 5 wt.%, more preferably 0.1 - 2 wt.%, particularly preferably 0.2 - 1 wt.%, extraordinarily preferably 0.3 - 0.6 wt.%.

[0044] In a further preferred embodiment of the invention, the composition used for coloring is characterized in that it contains, based on its weight, at least one anthocyanin in a total amount of 0.001-2 wt.%, preferably 0.01-1 wt.%, more preferably 0.02-0.5 wt.%, particularly preferably 0.03-0.2 wt.%, extraordinarily preferably 0.05-0.1 wt.%. Incubation time

[0045] In this context, the incubation time refers to the time between the addition of the glycosylase solution to the composition containing the anthocyanin-containing plant part and the contact of the dye composition with the keratin fibers to be dyed. Surprisingly, it was found that the shortest possible incubation time is most suitable for the color result.

[0046] Exposure time

[0047] A feature of the dyeing process according to the invention is that a composition containing at least one anthocyanin-containing plant part and at least one glycosylase (EC 3.2) located outside the plant part is applied to the keratin fibers and rinsed off after a contact time. This contact time is preferably 1 to 60 minutes, more preferably 5 to 45 minutes, particularly preferably 20 to 35 minutes, and extremely preferably 25 to 30 minutes.

[0048] After the exposure time for the composition according to the invention or preferred according to the invention has elapsed, the keratin fibers are rinsed with water in order to wash out the composition according to the invention or preferred according to the invention.

[0049] A preferred subject of the present invention is a method for the non-oxidative coloring of keratin fibers, in particular human hair, in which a composition containing at least one anthocyanin-containing plant part and a second composition containing at least one glycosylase (EC 3.2) are mixed with one another and this mixture is applied to the keratin fibers within a time of zero seconds to 10 minutes, preferably 10 seconds to 5 minutes, particularly preferably 15 to 60 seconds, and is rinsed off again after a contact time of 1 to 60 minutes, further preferably 5 to 45 minutes, particularly preferably 20 to 35 minutes, extremely preferably 25 to 30 minutes.

[0050] What has been said regarding preferred embodiments of the dyeing method according to the invention as claimed in claim 1 applies mutatis mutandis to preferred embodiments of this dyeing method preferred according to the invention with the stated incubation and exposure times.

[0051] A preferred subject of the present invention is a method for the non-oxidative coloring of keratin fibers, in particular human hair, in which a composition containing at least one anthocyanin-containing plant part and a second composition containing at least one glycosylase (EC 3.2) are mixed with one another and this mixture is applied to the keratin fibers within a time of zero seconds to 10 minutes, preferably 10 seconds to 5 minutes, particularly preferably 15 to 60 seconds, and is rinsed off again after a contact time of 1 to 60 minutes, further preferably 5 to 45 minutes, particularly preferably 20 to 35 minutes, extremely preferably 25 to 30 minutes, wherein the ready-to-use coloring composition has a temperature of 15 - 50 °C, preferably 20 - 40 °C, preferably 25 - 35 °C.

[0052] What has been said regarding preferred embodiments of the dyeing process according to the invention as claimed in claim 1 applies mutatis mutandis to preferred embodiments of this dyeing process preferred according to the invention with the stated incubation and exposure times and temperatures of the dyeing composition.

[0053] A further preferred subject of the present invention is a process for the non-oxidative coloring of keratinic fibers, in particular human hair, in which a composition containing at least one anthocyanin-containing plant part and a second composition containing at least one glycosylase (EC 3.2) are mixed together and this mixture is applied to the keratin fibers within a time of zero seconds to 10 minutes, preferably 10 seconds to 5 minutes, particularly preferably 15 to 60 seconds, and is rinsed off again after a contact time of 1 to 60 minutes, more preferably 5 to 45 minutes, particularly preferably 20 to 35 minutes, extremely preferably 25 to 30 minutes, wherein the ready-to-use coloring composition has a temperature of 15 - 50 °C, preferably 20 - 40 °C, preferably 25 - 35 °C and wherein the keratin fibers are heated during the entire contact time or at least during part of the contact time. The heat is preferably supplied by a heat lamp, a hair dryer or a hair dryer. The heat supplied is within a physiologically acceptable range.

[0054] The keratin fibers are preferably dried after rinsing out the composition according to the invention or preferred according to the invention. Drying can take place without actively applying heat. However, drying can also take place with the application of heat at a temperature of 25–120°C, particularly preferably at a temperature of 30–80°C, and extremely preferably at a temperature of 35–60°C. Heat is preferably applied using a heat lamp, a drying rod, a hair dryer, a hair straightener, or a hair dryer. The keratin fibers can be dried after the respective rinsing steps using an absorbent cloth, such as a towel. Towel-dried hair can optionally be partially or completely dried with a hair dryer or other heat source. It is also possible to allow the keratin fibers to air dry. pH value

[0055] Further preferred embodiments of the invention (dyeing composition, dyeing process) are characterized in that the composition according to the invention has a pH in the range from 1.0 to less than 4.0, preferably 1.5 to 3.5, particularly preferably 2.0 to 3.0, in each case measured at 20°C. In this acidic range of the dyeing solution, particularly good absorption of the dyes onto the keratin fibers was observed. Further preferred embodiments of the invention (dyeing composition, dyeing process) are characterized in that the composition according to the invention comprises a cosmetic carrier.

[0056] In a first preferred embodiment of the invention, the carrier is water. Further preferred embodiments of the invention (dyeing composition, dyeing process) are characterized in that the composition according to the invention contains, based on its weight, water in an amount of 30.0-99.8 wt.%, preferably 50.0-98.0 wt.%, particularly preferably 70.0-90.0 wt.%, extremely preferably 80.0-86.0 wt.%.

[0057] To optimize the applicability of the composition and its retention time on the keratin fibers, it is preferred that the composition according to the invention or preferred according to the invention has a thickened consistency. Preferred compositions are in the form of a gel, cream, or paste. Such carriers ensure a homogeneous distribution and a sufficient retention time of the composition on the keratin fibers.

[0058] The compositions according to the invention and those preferred according to the invention may optionally contain further additives to optimize the application properties of this composition. Preferred additives are, in particular, thickeners, which ensure that the composition adheres better to the hair during application.

[0059] Compositions particularly preferred according to the invention contain at least one or more hydrophilic thickeners, which are preferably selected from polysaccharides other than cellulose, which may be chemically and / or physically modified. Compounds from the group of polysaccharides other than cellulose are particularly preferred as hydrophilic thickeners according to the invention, since the basic structures of the polysaccharides are of natural origin and biodegradable.Preferred hydrophilic polysaccharide thickeners are other than celluloses, cellulose ethers and cellulose esters and are selected from xanthan gum, alginic acids (as well as their corresponding physiologically acceptable salts, the alginates), agar agar (with the polysaccharide agarose present in agar agar as the main component), starch fractions and starch derivatives such as amylose, amylopectin and dextrins, karaya gum, locust bean gum, gum arabic, pectins, dextrans and guar gum and mixtures thereof.

[0060] In preferred embodiments, xanthan gum is included as a hydrophilic thickener with a view to reliable viscosity adjustment and residue-free application to keratin fibers and the scalp.

[0061] Further preferred compositions according to the invention contain, with a view to reliably adjusting the viscosity, at least one polymeric thickener selected from non-ionic polymers, such as vinylpyrrolidinone / vinyl acrylate copolymers, polyvinylpyrrolidinone, vinylpyrrolidinone / vinyl acetate copolymers and polyethylene glycols with a molecular weight of 100,000 to 10,000,000 Daltons; cationic polymers such as dimethyldiallylammonium chloride polymers, acrylamide-dimethyldiallylammonium chloride copolymers, diethyl sulfate-quaternized dimethylaminoethyl methacrylate-vinylpyrrolidinone copolymers, vinylpyrrolidinone-imidazolinium methochloride copolymers and quaternized polyvinyl alcohol; zwitterionic and amphoteric polymers, such as acrylamidopropyl trimethylammonium chloride / acrylate copolymers and octylacrylamide / methyl methacrylate / tert-butylaminoethyl methacrylate / 2-hydroxypropyl methacrylate copolymers, diallyldimethylammonium chloride / acrylate-

[0062] Copolymers, t-butylaminoethyl methacrylate / N-(1,1,3,3-tetramethylbutyl)acrylamide / acrylate( / methacrylate) copolymers, anionic homo- and copolymers based on polyacrylic acids, polymethacrylic acids, cross-linked polyacrylic acids, cross-linked polymethacrylic acids, the esters and amides of optionally cross-linked poly(meth)acrylic acids, homo- and copolymers of acrylamido-2-methylpropanesulfonic acids, vinyl acetate / crotonic acid copolymers, vinylpyrrolidinone / vinyl acrylate copolymers, vinyl acetate / butyl maleate / isobornyl acrylate copolymers, methyl vinyl ether / maleic anhydride copolymers and acrylic acid / ethyl acrylate / Nt-butyl acrylamide terpolymers, each in their acid or salt form.

[0063] Compositions particularly preferred according to the invention contain, in each case based on their weight, at least one hydrophilic thickener in a total amount of 0.1 to 5 wt.%, preferably 0.5 to 4 wt.%, more preferably 1 to 3.5 wt.% and most preferably 1.2 to 2 wt.%.

[0064] Particularly preferred compositions according to the invention contain at least one organic solvent containing a phenyl group in the molecule. This solvent is preferably selected from phenoxyethanol, benzyl alcohol, and mixtures thereof. Surprisingly, it has been found that such aromatic solvents can have a positive effect on the dyeing results of the dyeing process according to the invention.

[0065] In a further preferred embodiment of the present invention, the compositions preferred according to the invention contain, in each case based on their weight, 0.1 to 3 wt.%, preferably 0.5 to 2.5 wt.%, more preferably 0.8 to 1.0 wt.%, of at least one organic solvent which has a phenyl group in the molecule. In a further preferred embodiment of the present invention, the compositions according to the invention contain, in each case based on their weight, 0.1 to 3 wt.%, preferably 0.5 to 2.5 wt.%, more preferably 0.8 to 1.0 wt.%, of at least one organic solvent selected from phenoxyethanol, benzyl alcohol and mixtures thereof.Further compositions particularly preferred according to the invention contain at least one aliphatic solvent selected from C1-C14 alkanols and C2-C12 polyols, in particular selected from ethanol, isopropanol, n-propanol, ethylene glycol, 1,2-propanediol, glycerol, diethylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,2-hexanediol, 1,6-hexanediol and 1,2-octanediol, and mixtures of these solvents.

[0066] Further compositions which are particularly preferred according to the invention contain, based on their weight, at least one aliphatic solvent selected from C1-C4 alkanols and C2-C12 polyols, in a total amount of 0.01-60% by weight, preferably 0.1-30% by weight, particularly preferably 0.5-20% by weight, extraordinarily preferably 1-10% by weight, further preferably 2-5% by weight.

[0067] Other compositions particularly preferred according to the invention are characterized in that they do not contain an aliphatic solvent selected from C1-C4 alkanols and C2-C12 polyols.

[0068] Particularly preferred compositions according to the invention contain at least one oil. Preferred cosmetic oils are selected from natural and synthetic hydrocarbons, particularly preferably from paraffin oils, C18-C16 isoparaffins, in particular isoeicosane, polyisobutenes and polydecenes, C8-C16 isoparaffins, and 1,3-di-(2-ethylhexyl)cyclohexane; the benzoic acid esters of linear or branched C8-C22 alkanols; fatty alcohols having 6-30 carbon atoms, which are unsaturated or branched and saturated or branched and unsaturated; triglycerides of linear or branched, saturated or unsaturated, optionally hydroxylated C8-C10 fatty acids, in particular natural oils; the dicarboxylic acid esters of linear or branched C22-C10 alkanols;the esters of linear or branched saturated or unsaturated fatty alcohols with 2-30 carbon atoms with linear or branched saturated or unsaturated fatty acids with 2-30 carbon atoms, which may be hydroxylated; the addition products of 1 to 5 propylene oxide units with mono- or polyhydric C8-22-alkanols; the addition products of at least 6 ethylene oxide and / or propylene oxide units with mono- or polyhydric C8-22-alkanols; the C8-C8-22 fatty alcohol esters of monohydric or polyhydric C2-C7-hydroxycarboxylic acids; the symmetrical, asymmetrical or cyclic esters of carbonic acid with C3-22-alkanols, C3-22-alkanediols or C3-22-alkanetriols; the esters of dimers of unsaturated C12-C22 fatty acids (dimer fatty acids) with monohydric linear, branched, or cyclic C2-C18 alkanols or with polyhydric linear or branched C2-C6 alkanols; silicone oils and mixtures of the aforementioned substances.

[0069] Further compositions particularly preferred according to the invention contain at least one surfactant or one emulsifier.

[0070] Surfactants and emulsifiers within the meaning of the present application are amphiphilic (bifunctional) compounds consisting of at least one hydrophobic and at least one hydrophilic moiety. The hydrophobic moiety is preferably a hydrocarbon chain with 8-28 carbon atoms, which may be saturated or unsaturated, linear or branched. This C8-C28 alkyl chain is particularly preferably linear. Basic properties of surfactants and emulsifiers are oriented absorption at interfaces, aggregation into micelles, and the formation of lyotropic phases. When selecting surfactants suitable according to the invention, it may be preferable to use a mixture of surfactants in order to optimally adjust the stability of the compositions according to the invention. Preferred surfactants and emulsifiers are selected from anionic, cationic, zwitterionic, amphoteric, and nonionic surfactants and emulsifiers, as well as mixtures of these substances.

[0071] Further compositions particularly preferred according to the invention contain at least one linear saturated alkanol having 12 - 30 carbon atoms.

[0072] Preferred linear saturated alkanols having 12-30 carbon atoms, in particular having 16-22 carbon atoms, are selected from cetyl alcohol, stearyl alcohol, arachidyl alcohol, behenyl alcohol, and lanolin alcohol, as well as mixtures of these alkanols. Particularly preferred alkanol mixtures according to the invention are those obtainable from the industrial hydrogenation of vegetable and animal fatty acids. The total amount of at least one linear saturated alkanol having 12-30 carbon atoms is preferably 0.1-20 wt.%, preferably 0.5-16.5 wt.%, and particularly preferably 3-10 wt.%, in each case based on the weight of the composition according to the invention.

[0073] Preferred compositions and dyeing processes according to the invention are further characterized in that no hydrogen peroxide is used in them.

[0074] In order to make the compositions according to the invention also olfactory attractive for the user, further compositions which are particularly preferred according to the invention are characterized in that they contain at least one fragrance compound or odoriferous compound.

[0075] Compositions which are extraordinarily preferred according to the invention are characterized in that they contain, based on their weight, at least one fragrance in a total amount of 0.01 - 5 wt.%, preferably 0.1 - 3 wt.%, particularly preferably 0.5 - 2 wt.%, extraordinarily preferably 1 - 1.5 wt.%.

[0076] What has been said regarding preferred embodiments of the dyeing process according to the invention applies mutatis mutandis to preferred embodiments of the dyeing compositions according to the invention.

[0077] The exemplary embodiments presented below are intended to explain the subject matter of the invention in more detail without limiting it thereto.

[0078] The dyeing process according to the invention was carried out on strands of white buffalo belly hair (tied in a round shape, approx. 8 cm of free hair).

[0079] For all dyeing experiments described below, a 1 wt.% solution of a powder from dried Ribes nigrum berries in water, adjusted to a pH of 3 ± 0.15 with 10 wt.% hydrochloric acid, measured at 20°C, was prepared and used as the test dye.

[0080] The raw material used was "Black Currant Fruit Powder" from Matha Exports International LLP, Ashram, New Delhi, India. According to the manufacturer, it is powdered, spray-dried black currants (Ribes nigrum berries). The manufacturer states that this raw material contains 5.25% anthocyanins by weight, based on the Ribes nigrum berry powder.

[0081] Standard staining procedure for all staining tests described below

[0082] Buffalo belly hair strands were immersed in the respective dye solution for 30 minutes while stirring. The liquor ratio (amount of Ribes nigrum solution per gram of hair) was 50 ml of Ribes nigrum solution per gram of hair.

[0083] Unless otherwise stated, the staining solution was at 20°C (room temperature).

[0084] After coloring, the hair strands were rinsed under running deionized water for 30 seconds, combing 20 times (20°C).

[0085] The hair strands were then dried with a standard hairdryer at a defined distance (d = 10 cm) and a defined temperature (T = 80 ± 5 °C) with 20 combs. The strands were then colorimetrically measured.

[0086] Determination of the color shade achieved by the process according to the invention

[0087] All colorimetric measurements were performed using the Spectraflash SF 600 colorimetric device from Datacolor.

[0088] The color difference, also known as dE or AE, can be easily determined colorimetrically using a colorimeter that measures colors in the L*, a*, b* color space, for example, a Datacolor Spectraflash SF 600 colorimeter.

[0089] The L*,a*,b* color space refers to the CIELAB color space. The L value represents the brightness of the color (black-white axis); the higher the L value, the brighter the color. The a value represents the red-green axis of the system; the higher this value, the more the color is shifted toward red. The b value represents the yellow-blue axis of the system; the higher this value, the more the color is shifted toward yellow.

[0090] The color shift AE, i.e. the color difference between two (hair) colors, for each of which an L*, a*, b* value combination has been determined, is calculated according to the following formula:

[0091] AE = (AL 2 + Aa 2 + From 2 ) 05

[0092] The larger the value for AE, the more pronounced the color difference.

[0093] A D65 illuminant and a diffuse / 8° optical configuration were used for the spectrophotometer measurements. The spectral reflectance data for each sample from 380 nm to 700 nm were converted to colorimetric data using DCI Color software. Reflectance measurements were determined for each hair sample, with the average of four measurements recorded.

[0094] The color difference (AE) between the uncolored strand and the colored strand was calculated according to the following formula:

[0095] Lv, av, bv: colorimetric values ​​for dyed strands

[0096] Ln, an, bn: Colorimetric values ​​for undyed, untreated strands

[0097] Coloring with Ribes nigrum without enzyme addition

[0098] In an initial study, the hair was dyed – not according to the invention – only with Ribes nigrum without added enzymes. The influence of the temperature of the dyeing solution on the resulting color was also investigated. The colorimetric values ​​are summarized in Table 1. Table 1: Color results of the dyeing in a 1 wt. % Ribes nigrum solution without added enzymes at various dyeing solution temperatures; 30 minutes exposure time, pH 3

[0099] The AE values ​​refer to the L*, a*, b* values ​​of the untreated buffalo hair.

[0100] The resulting colors ranged from gray-brown to light brown to dark blonde. It was observed that the color intensity, represented by the L* value, increased with increasing temperature of the dye solution, reaching a maximum at 50°C. This means that the lowest L* value was observed at 50°C. The greatest temperature dependence was observed along the blue-yellow axis, represented by the colorimetric b* value. As the temperature of the dye solution increased, the b* value increased, meaning the color shifted toward yellow.

[0101] Color change due to addition of glycosylases

[0102] Surprisingly, it was discovered that the affinity of dyes from anthocyanin-containing plant parts to the keratin fiber, and the resulting color, depends significantly on the sugar residues and the molecular size and charge of the anthocyanins. The addition of glycosylases can split off sugar residues, forming the aglycones actually responsible for the color, the so-called anthocyanidins. In this way, more and different anthocyanins found in Ribes nigrum, particularly in the berries of Ribes nigrum, can bind to the keratin fiber compared to coloration without the addition of glycosylase.

[0103] In the experiment, a glycosylase mixture (EC 3.2) obtained from Novozymes was used. This enzyme mixture comprised at least one endo-1,4-beta-glucanase (EC 3.2.1.4) in a total amount of 20 - 35 wt.%, at least one beta-glucosidase (EC 3.2.1.21) in a total amount of 15 - 25 wt.%, furthermore at least one enzyme selected from at least one exo-1,4-beta-D-glucanase (EC 3.2.1.91) and at least one oligooxyloglucan-reducing end-specific cellobiohydrolase (EC 3.2.1.150) and mixtures thereof in a total amount of 25 - 35 wt.%, as well as at least one further enzyme with glycosylase activity in a total amount of up to 100 wt.%, wherein the amounts refer to the total weight of the enzyme mixture.

[0104] The enzyme active substance content in the mixture used, which was in the form of an aqueous composition, was 190 pg / pl.

[0105] For the stainings with Ribes nigrum in combination with the previously described glycosylase mixture, a 1 wt.% solution of a powder of dried Ribes nigrum berries in water, to which the respective amount of glycosylase mixture was added and which was adjusted to a pH value of 3 ± 0.15, measured at 20°C, with 10 wt.% hydrochloric acid, was prepared and used.

[0106] The strands were dyed according to the standard dyeing procedure described above. For the series of experiments presented in Table 2, the strands were dyed directly after adding the enzyme to the acidic Ribes nigrum solution.

[0107] As the colorimetric values ​​presented in Table 2 show, the addition of various amounts of glycosylase mixture led to an intensification of the violet tone in the solution and on the hair fiber. The most intense color result was achieved with 10 μl of enzyme solution / 50 ml of dye solution, i.e., with an enzyme active substance concentration of 1.9 mg of enzyme active substance / 50 ml.

[0108] Table 2: Color results of the staining in 1 wt.% Ribes nigrum solution with different concentrations of glycosylase solution (cellulase solution), 30 minutes exposure time, pH 3, room temperature

[0109] The AE values ​​refer to the L*, a*, b* values ​​of the untreated buffalo hair.

[0110] In another series of experiments, it was investigated whether it is necessary to allow the glycosylase to act on the anthocyanin-containing plant parts for a certain incubation period before dyeing the keratin fibers. The colorimetric measurements compiled in Table 3 show that no incubation period is necessary; rather, the shortest possible incubation period is best for the color result (see Table 3). In this context, incubation time is understood to be the time between the addition of the enzyme solution to the Ribes nigrum solution and the addition of the keratin fibers to be dyed.

[0111] The strands were treated according to the standard dyeing procedure described above. For the series of experiments presented in Table 3, the strands were either dyed directly after adding the enzyme to the acidic Ribes nigrum solution (incubation time 0 minutes) or added to the dyeing solution after the specified incubation time and then treated according to the standard dyeing procedure.

[0112] Table 3: Color results of the staining in 1 wt.% Ribes nigrum solution in combination with 10 pL glycosylase solution (cellulase solution) after different incubation times, 30 minutes exposure time, pH 3, room temperature

[0113] The AE values ​​refer to the L*, a*, b* values ​​of the untreated buffalo hair.

[0114] In a further series of experiments, the influence of the temperature of the staining solution on the resulting coloration in the presence of added glycosylases was investigated. The colorimetric values ​​are summarized in Table 4.

[0115] Table 4: Color results of staining 1 wt.% Ribes nigrum solution with 100 pL glycosylase solution (cellulase solution) at different temperatures of the staining solution, 30 minutes

[0116] Contact time, pH 3

[0117] The AE values ​​refer to the L*, a*, and b* values ​​of the untreated buffalo hair. The resulting colorations ranged from various shades of violet, initially becoming progressively darker and then transitioning to brown tones.

[0118] Here, too, the greatest temperature dependence was observed along the blue-yellow axis, represented by the colorimetric b* value. As the temperature of the staining solution increased, the b* value in particular increased, meaning the color shifted toward yellow. However, the L* value also showed a clear temperature dependence.

Claims

Patent claims 1. A process for the non-oxidative coloring of keratin fibers, in particular human hair, in which a composition containing at least one anthocyanin-containing plant part and at least one glycosylase (EC 3.2) located outside the plant part is applied to the keratin fibers and rinsed off after a contact time.

2. The method according to claim 1, characterized in that the at least one glycosylase (EC 3.2) is selected from at least one glycosidase (EC 3.2.1).

3. The method according to claim 2, characterized in that the at least one glycosidase (EC 3.2.1) is selected from at least one cellulase.

4. The method according to claim 2 or 3, characterized in that the at least one glycosidase (EC 3.2.1) or at least one cellulase is selected from endo-1,4-beta-glucanase (EC 3.2.1.4), beta-glucosidase (EC 3.2.1.21), exo-1,4-beta-glucosidase (EC 3.2.1.74), cellulose-1,4-beta-cellobiosidase (EC 3.2.1.176), exo-1,4-beta-D-glucanase (EC 3.2.1.91) and oligooxyloglucan-reducing end-specific cellobiohydrolase (EC 3.2.1.150) as well as mixtures of these enzymes.

5. The method according to any one of claims 1 to 4, characterized in that the composition used for dyeing contains an enzyme mixture comprising at least one endo-1,4-beta-glucanase (EC 3.2.1.4) in a total amount of 20-35% by weight, at least one beta-glucosidase (EC 3.2.1.21) in a total amount of 15-25% by weight, and at least one exo-1,4-beta-D-glucanase (EC 3.2.1.91) in a total amount of 25-35% by weight, as well as at least one further enzyme with cellulase activity in a total amount of up to 100% by weight, the amounts being based on the total weight of the enzyme mixture in the composition.

6. Process according to one of claims 1 to 5, characterized in that the composition used for dyeing contains, based on its weight, at least one glycosylase (EC 3.2) in a total amount of 0.0001 - 1 wt.%, preferably 0.001 - 0.1 wt.%, more preferably 0.002 - 0.05 wt.%, particularly preferably 0.003 - 0.04 wt.%, extraordinarily preferably 0.01 - 0.03 wt.%.

7. The method according to any one of claims 1 to 6, characterized in that the anthocyanin-containing plant is selected from Ribes nigrum, Euterpe oleracea (cabbage palm, agai), Aronia (chokeberry), Malus domestica, Solanum melongena, Fragaria, Vaccinium, Hibiscus, Sambu- cus nigra, Citrus sinensis, Rubus sect. Rubus, Rubus idaeus, Punus avium, Prunus cerasus, Ribes rubrum, red cabbage (Brassica oleracea convar. capitata var. rubra L.) and Vitis vinifera. Method according to one of claims 1 to 7, characterized in that the anthocyanin-containing plant part is selected from berries, fruits, aggregate nuts, aggregate stone fruits, stone fruits, apple fruits, peels, cones, leaves, stems, branches, bark, trunk wood, seeds or roots of an anthocyanin-containing plant. Method according to one of claims 1 to 8, characterized in that the at least one anthocyanin-containing plant part is used as a water-soluble powder. Method according to one of claims 1 to 9, characterized in that at least one anthocyanin-containing plant part extract is used as the anthocyanin-containing plant part.Method according to one of claims 1 to 10, characterized in that the composition used for dyeing contains, based on its weight, at least one anthocyanin-containing plant part in a total amount of 0.05 - 20 wt.%, preferably 0.1 - 10 wt.%, more preferably 0.5 - 5 wt.%, particularly preferably 0.7 - 2 wt.%, extraordinarily preferably 1 - 1.5 wt.%. Method according to one of claims 1 to 11, characterized in that the composition has a pH in the range from 1.0 to less than 4.0, measured at 20°C. Method according to one of claims 1 to 12, in which a composition containing at least one anthocyanin-containing plant part and a second composition containing at least one glycosylase (EC 3.2), are mixed together, and this mixture is applied to the keratin fibers within a time of zero seconds to 10 minutes, preferably 10 seconds to 5 minutes, particularly preferably 15 to 60 seconds, and is rinsed off again after a contact time of 1 to 60 minutes, more preferably 5 to 45 minutes, particularly preferably 20 to 35 minutes, extremely preferably 25 to 30 minutes. Composition for the non-oxidative coloring of keratin fibers, in particular human hair, which contains at least one anthocyanin-containing plant part and at least one glycosylase (EC 3.2) which is located outside the plant part. Composition according to claim 14, characterized in that it is a composition as described in any one of claims 2-12.

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