Hair dye composition with improved viscosity

Abstract

The present disclosure relates to the field of cosmetics. In particular, the present disclosure relates to hair dye compositions (aqueous hair coating solutions) having improved viscosity. These compositions are characterized in that such compositions comprise a complex selected from the group consisting of iron-tannic acid complexes, iron-gallic acid complexes or mixtures thereof.

Description

Technical Field

[0001] The present disclosure relates to the field of cosmetics. In particular, the present disclosure relates to hair dye compositions (aqueous hair coating solutions) with improved viscosity. Background Art

[0002] Traditional permanent hair dyes have several significant disadvantages, including:

[0003] (1) They destroy hair texture;

[0004] (2) they pose potential risks to human health;

[0005] (3) they pose potential environmental problems during cleanup;

[0006] (4) The processing time for both the customer and the hairstylist is very long.

[0007] CN106477559A relates to a modified graphene hair dye comprising a colorant and a developer. The colorant comprises modified graphene, gallic acid, an auxiliary agent, a cosolvent, and distilled water. The graphene acts as a far-infrared therapy for hair care after dyeing. However, the prior art does not mention the use of any iron-tannic acid complex or iron-gallic acid complex, and the prior art does not mention the viscosity problem of the graphene hair dye or a technical solution to such a problem.

[0008] CN106477559A relates to graphene and its preparation method. In this prior art method, gallic acid and tannic acid are added to a modified graphene oxide dispersion to obtain the final graphene product. However, the prior art does not mention the use of any iron-tannic acid complex or iron-gallic acid complex, and the prior art does not mention the viscosity problem of graphene hair dyes or technical solutions to such problems.

[0009] While there are alternatives to traditional permanent hair dyes on the market, these alternatives have some drawbacks during application. Some semi-permanent hair dyes are free of irritants like ammonia and hydrogen peroxide, but they still contain the carcinogen paraphenylenediamine (PPD). Secondly, there are hair dyes on the market that claim to be natural and therefore less harmful, but these natural-based hair dyes have actually been reported to contain toxic heavy metals. For temporary hair color spray products with quick processing times, application is via a spray of a low-viscosity pigment solution, and the coloring effect is not long-lasting.

[0010] Therefore, there is a great industry demand for hair dye products that are easy to apply, safe, environmentally friendly and long-lasting. Summary of the Invention

[0011] One of the subjects of the present disclosure is a hair dye composition. These compositions are characterized herein in that they contain a complex selected from an iron-tannic acid complex, an iron-gallic acid complex, or a mixture thereof.

[0012] Another subject of the present disclosure is the use of a complex chosen from iron-tannic acid complexes, iron-gallic acid complexes or mixtures thereof as defined in a composition according to the preceding claims for increasing the viscosity of said composition.

[0013] Furthermore, another subject matter is a method for dyeing hair, in which the above-described composition is used.

[0014] Other features, elements, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown are the structures of (a) graphene, (b) graphene oxide, and (c) reduced graphene oxide.

[0016] Figure 2 Shown is the difference between functionalized graphene and other pigments and dyes on hair.

[0017] Figure 3 Proposed π-π interactions between functionalized graphene and tannic acid ligands are shown.

[0018] Figure 4 The process for aqueous hair coating solutions is shown.

[0019] Figure 5 A viscosity comparison between hair coating solutions with and without iron (III) ions is shown. DETAILED DESCRIPTION

[0020] The present invention provides a safe and environmentally friendly water-based coating for hair coloring that contains functionalized graphene as a coloring component. This non-invasive coating solution for hair coloring does not damage the hair structure. Furthermore, it is formulated into a water-based (aqueous) solution with non-hazardous components, resulting in a safe and environmentally friendly product. The hair coloring process can be as fast as 10 minutes, saving significant time compared to the long processing time of conventional hair coloring treatments (up to one hour).

[0021] The water-based hair paint uses functionalized graphene as a coloring component. Graphene is composed of carbon atoms arranged in a hexagonal lattice, forming a two-dimensional sheet that is one atom thick. The structures of graphene and some functionalized graphene are as follows Figure 1As shown. Graphene is composed only of carbon atom elements throughout its structure. However, according to different methods for preparing graphene from different precursors, the resulting prepared graphene will also be composed of different additional functional groups (which are not necessarily composed of carbon atom elements). Some examples of the above-mentioned functional groups include hydroxyl groups and carboxylic acid groups. Different properties are produced by the presence of different functional groups in the graphene structure, such as color and the interaction between the functional graphene-polymer coating solution. For example, the reduced graphene oxide (rGO) mentioned in the program example is composed of hydroxyl groups (-OH) in the graphene structure and is prepared by reducing the graphene oxide precursor with ascorbic acid.

[0022] The extended two-dimensional sheet structure of functionalized graphene provides a large surface area for good attachment to the hair surface, thus providing better adhesion without the need for large amounts of adhesive additives that promote adhesion. On the other hand, most pigments and dyes do not have such a 2D sheet structure and cannot provide the same adhesion as functionalized graphene, see Figure 2 .

[0023] For ease of application and long-lasting effect, the viscosity of the aqueous hair coating solution was increased by adding iron-tannic acid and iron-gallic acid complexes. These complexes also facilitated the dispersion of functionalized graphene in the aqueous solution. This effect can be explained by π-π interactions between functionalized graphene and the tannic acid or gallic acid ligands ( Figure 3 Theoretically, the π-π interaction is predicted to be between the π-electron cloud of the graphene structure and the π-electron cloud of the hydroxylated phenyl groups of tannic acid and gallic acid. Regarding the iron-gallic acid interaction, the iron(III) ions are predicted to interact with the hydroxyl groups of the gallic acid in the hair styling solution.

[0024] Unless otherwise noted, the viscosity of samples (including hair coating solutions prepared according to the present invention and other comparative samples from the art) was measured using a viscometer. An Ametek Brookfield DV1M viscometer was used for the measurements. It can measure solutions with viscosities ranging from 15 to 2,000,000 cP. To measure viscosity, a selected spindle was placed in a beaker containing the sample to be measured and the sample's viscosity was measured at different rotational speeds. Thus, the viscosities of the samples at the same rotational speed were compared.

[0025] One difference between prior art graphene hair dyes and the graphene hair coating solution according to the present invention is the viscosity of the resulting solution. The presence of iron-tannic acid and / or iron-gallic acid complex additives in the formulation creates a solution texture similar to traditional hair dye solutions, providing a sense of familiarity for hairstylists during handling. The role of the iron (in the form of iron(III)) in the solution is to interact with the tannic acid / gallic acid to provide a solution with a higher viscosity.

[0026] By combining the functionalized graphene with the iron-tannic acid / gallic acid complex to improve adhesion and viscosity, the aqueous hair coating solution according to the present invention can be applied to hair within a 10-minute processing time, significantly faster than the nearly one-hour processing time of conventional hair coloring. Therefore, this aqueous hair coating is expected to revolutionize the hair coloring market.

[0027] With the aqueous hair coating solution according to the present invention on hand, it can be applied to human hair using the same brushing method as conventional hair coloring dyes ( Figure 4 ).

[0028] The aqueous hair coating solution according to the present invention can be prepared by mixing graphene oxide solution, L-ascorbic acid, tannic acid, gallic acid, iron (III) nitrate nonahydrate, and deionized / distilled water.

[0029] Non-limiting examples of the composition invention are as follows:

[0030] Example 1

[0031] Preparation and Application of Water-Based Hair Coating Solution (Black)

[0032] 1. Materials

[0033] -2.5wt% graphene oxide solution, brand: Graphenea

[0034] -L-Ascorbic acid, CAS No. 50-81-7, Brand: TCI

[0035] -Tannic acid, CAS No. 1401-55-4, Brand: Sigma Aldrich

[0036] -Gallic acid, CAS No. 5995-86-8, Brand: TCI

[0037] -Iron(III) nitrate nonahydrate, CAS number 7782-61-8, brand: Sigma Aldrich

[0038] - Deionized / distilled water

[0039] 2. Personal protective equipment

[0040] -Gloves

[0041] - Goggles

[0042] -mask

[0043] -Laboratory coat

[0044] 3. Equipment and Instruments

[0045] -Scale, Shimadzu

[0046] -Hot plate stirrer, IKA

[0047] -Ultrasound machine with probe, Qsonica

[0048] -Air condenser, Chemglass Life Sciences

[0049] -Magnetic stirring bar

[0050] -Round bottom flask

[0051] -Buchner funnel with Erlenmeyer flask

[0052] -Beaker

[0053] -Automatic pipette

[0054] 4. Procedure

[0055] 4.1 Synthesis of reduced graphene oxide (rGO) paste:

[0056] 4.1.1 Add 40 g of 2.5 wt% graphene oxide solution, 1 g of tannic acid, 10 g of ascorbic acid, and 100 g of deionized / distilled water to a 500 mL round-bottom flask equipped with a magnetic stir bar.

[0057] 4.1.2 Connect the flask to an air condenser and heat it at 120°C for 1 hour.

[0058] 4.1.3 The reaction mixture was filtered by suction filtration, and rGO paste was obtained as the residue.

[0059] 4.1.4 The rGO paste was washed several times with deionized water until the filtrate became clear and its pH reached 7.

[0060] 4.2 Synthesis of black aqueous hair coating solution:

[0061] 4.2.1 Add deionized / distilled water to the prepared rGO paste (obtained from procedure 4.1.4) to make up to 54 g, and then add 0.5 g of gallic acid. Mix the entire solution evenly under ultrasonic treatment for 1 minute (treatment time: 30 seconds pulse on and 30 seconds pulse off).

[0062] 4.2.2 Add 5.94 mL of a 0.4 g / mL aqueous solution of iron (III) nitrate nonahydrate (prepared by mixing 4 g of iron (III) nitrate nonahydrate with deionized / distilled water until a 10 mL solution forms) to the mixture. The entire solution is further homogenized under ultrasonication for 1 minute (treatment time: 30 seconds pulse on and 30 seconds pulse off).

[0063] 4.3 Dye application process

[0064] 4.3.1 Apply black aqueous hair coating solution (obtained from procedure 4.2.2) to the hair and dry with a hair dryer using the hot air setting for 4 minutes.

[0065] 4.3.2 Apply the black water-based hair coating solution again to the hair and dry it with a hair dryer using the hot air setting for 8 minutes.

[0066] 4.3.3 Allow the coated hair to stand in air for 30 minutes.

[0067] 4.3.4 Wash the coated hair with shampoo, rinse thoroughly with tap water, and dry with a hair dryer.

[0068] Example 2

[0069] The graphene hair dye solution prepared according to the present invention was compared with four prior art hair dyes:

[0070] - Traditional permanent hair dye

[0071] Example: L'Oreal Paris Excellence Creme Permanent Hair Color; ingredients and details: please refer to

[0072] https: / / www.lorealparisusa.com / products / hair-color / products / permanent / excellence-crème-permanent-triple-protection-hair-color.aspx? shade=4-dar k-brown

[0073] -Semi-permanent hair dye

[0074] Example: L'Oréal Paris Casting Crème Gloss Semi-Permanent Hair Dye, Ammonia-Free Formula & Honey-Infused Conditioner, Glossy Finish; Ingredients and details: Please refer to

[0075] https: / / www.amazon.co.uk / LOreal-Casting-Semi-Permanent-leaving-radiant / dp / B087XLP661

[0076] -Natural-based hair dyes

[0077] Example: Vatika Henna Hair Colour Natural-Black; ingredients and details: see https: / / www.tesco.com / groceries / en-GB / products / 294497170

[0078] -Temporary hair coloring spray

[0079] Example: B-Wild Temporary Hair Color Spray; Ingredients and details: Please refer to

[0080] https: / / www.walgreens.com / store / c / b-wild-temporary-hair-color-spray / ID=prod9333-product

[0081] The test results are shown in the following table.

[0082] surface

[0083]

[0084] A fast, safe, and environmentally friendly aqueous hair coating solution has been prepared by using functionalized graphene as the coloring component, which has a short processing time and long color retention without damaging the hair texture.

[0085] The inventors have discovered a non-invasive hair dye formulation that eliminates the use of harmful chemicals commonly used in traditional hair dye formulations, such as ammonia, hydrogen peroxide, and carcinogenic paraphenylenediamine (PPD) additives. Functionalized graphene, consisting of an extended two-dimensional sheet structure, serves as the colorant for this water-based hair dye. This sheet structure provides a large surface area covering the entire hair surface, providing strong adhesion and durability. The presence of iron-tannic acid and iron-gallic acid complex additives in the formulation creates a solution texture similar to traditional hair dye solutions, providing a familiar feel for hairstylists during the process. Most importantly, the developed water-based hair dye solution can reduce processing time from the traditional one hour to just 10 minutes, significantly impacting the hair coloring industry.

[0086] Example 3

[0087] The viscosities of the graphene hair dye solution according to the present invention and the graphene hair dye of the prior art prepared as described above were tested using the above-mentioned viscometer.

[0088] Figure 5 Available test results comparing the viscosity between hair coating solutions with and without iron (III) ions are shown.

[0089] It was found that in the presence of iron(III) ions of the iron-tannic acid / iron-gallic acid complex according to the invention, the hair coating solution has a significantly higher viscosity.

[0090] In addition, the viscosity of the prior art graphene hair dye was measured and found to be lower than 15 cP when the rotation rate was higher than 10 rpm. The extremely low viscosity of the prior art formulation would hinder its application in practical situations.

[0091] The iron-tannic acid / iron-gallic acid complex in the hair coating solution was found to be the longest lasting and had the most suitable viscosity for hair coating application.

[0092] While at least one exemplary embodiment has been presented in the foregoing detailed description, it should be appreciated that a wide variety of variations exist. It should also be understood that one or more exemplary embodiments are merely examples and are not intended to limit the scope, applicability, or configuration of the various embodiments in any way. On the contrary, the foregoing detailed description will provide those skilled in the art with a convenient guide to implementing the exemplary embodiments contemplated herein. It will be appreciated that various changes may be made to the functions and arrangements of the elements described in the exemplary embodiments without departing from the scope of protection of the various embodiments.

Claims

1. A hair dye composition comprising graphene and a complex selected from an iron-tannic acid complex, an iron-gallic acid complex or a mixture thereof.

2. The composition according to claim 1, wherein the graphene is reduced graphene oxide.

3. The composition according to claim 1 or 2, wherein the reduced graphene oxide comprises hydroxyl groups in the graphene structure.

4. The composition according to claim 1 or 2, wherein the complex is a mixture of an iron-tannic acid complex and an iron-gallic acid complex.

5. The composition of claim 1 or 2, wherein the iron in the complex is in the form of iron (III).

6. Use of a complex selected from an iron-tannic acid complex, an iron-gallic acid complex or a mixture thereof as defined in the preceding claim in a composition for increasing the viscosity of said composition.

7. A method for dyeing hair, wherein a composition according to the preceding claim is used.

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