Composition and method for suppressing fading of dyed hair, and hair cosmetic for dyed hair and method for producing the same.

Abstract

To provide a technology for suppressing fading of dyed hair.SOLUTION: Provided is a composition for suppressing fading of dyed hair, containing as an active ingredient a reduced starch syrup having the following sugar composition of (a) or (b): (a) less than 30 mass% of monosaccharide and less than 50 mass% of pentasaccharide or higher saccharide; and (b) 50 mass% or more of pentasaccharide or higher saccharide. According to the present invention, a hair cosmetic that can suppress discoloration of dyed hair can be obtained by blending a predetermined reduced starch syrup as a raw material. If the hair cosmetic is used as, for example, a hair styling product, a hair nourishing product, or a hair washing product, and these products are used in a normal manner on a daily basis, fading of dyed hair can be easily suppressed.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a composition for inhibiting fading of dyed hair, a hair cosmetic for dyed hair, and a method for producing the same. [Background technology]

[0002] Traditionally, hair coloring has been performed by changing the color of hair using pigments, dyes, oxidative bleaches, etc. Among hair coloring products, semi-permanent hair dyes and permanent hair dyes, excluding temporary hair dyes (which temporarily color hair by attaching pigments to the surface of the hair), are dyed by penetrating the dye into the hair or by generating the dye inside the hair, and are required to have a color that lasts for a long period of time, about two weeks to three months.

[0003] However, in reality, the dye inside the hair is washed away by daily washing, etc., or the pigment is thermally decomposed by hair dryers, hair irons, sunlight, etc., resulting in gradual fading. Therefore, research and development of technologies to suppress fading of dyed hair has been conducted, and for example, Patent Document 1 discloses a technology to suppress fading of dyed hair by using a specific silicone. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-132779 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology described in Patent Document 1 shows that it is effective when applied to dried dyed hair, i.e., when used like a hair styling product, but it is unclear whether the fading suppression effect can be obtained in other usage modes, such as when mixed with a hair wash. In other words, even in light of the prior art, there is not a sufficient supply of technology for suppressing fading of dyed hair. The present invention has been made to solve the above problem, and aims to provide a technology for suppressing fading of dyed hair. [Means for solving the problem]

[0006] As a result of intensive research, the present inventors have found that reduced starch syrup (medium to low sugar content reduced starch syrup) obtained by reducing starch syrup with a relatively small degree of hydrolysis of starch can suppress fading of dyed hair. Based on this knowledge, the present inventors have completed the following inventions.

[0007] (1) A first aspect of the composition for inhibiting fading of dyed hair according to the present invention contains, as an active ingredient, a reduced starch syrup having a sugar composition of the following (a) or (b): (A) Less than 30% by mass of monosaccharides and less than 50% by mass of 5 or more sugars; (i) Five or more sugars constitute 50% or more by mass.

[0008] (2) In the present invention, the sugar composition of the reduced starch syrup may be (c) 2 to 10 mass% monosaccharides, 15 to 55 mass% disaccharides, 15 to 65 mass% trisaccharides, 1 to 15 mass% tetrasaccharides, and 1 to 38 mass% pentasaccharides or more.

[0009] (3) In the present invention, the sugar composition of the reduced starch syrup may be (e) 2 to 10 mass% monosaccharides, 6 to 21 mass% disaccharides, 7 to 23 mass% trisaccharides, 5 to 13 mass% tetrasaccharides, and 50 to 82 mass% pentasaccharides or more.

[0010] (4) A second embodiment of the composition for inhibiting fading of dyed hair according to the present invention comprises, as an active ingredient, (e) reduced starch syrup obtained by reducing starch syrup having a dextrose equivalent of 10 or more and less than 40.

[0011] (5) The hair cosmetic composition for dyed hair according to the present invention is characterized in that it contains any one of reduced starch syrups selected from the following (C) to (E): (C) reduced starch syrup having a sugar composition of 2 to 10% by mass of monosaccharides, 15 to 55% by mass of disaccharides, 15 to 65% by mass of trisaccharides, 1 to 15% by mass of tetrasaccharides, and 1 to 38% by mass of pentasaccharides or more; (D) reduced starch syrup having a sugar composition of 2 to 10% by mass of monosaccharides, 6 to 21% by mass of disaccharides, 7 to 23% by mass of trisaccharides, 5 to 13% by mass of tetrasaccharides, and 50 to 82% by mass of pentasaccharides or more; (O) Reduced starch syrup obtained by reducing starch syrup having a dextrose equivalent of 10 or more but less than 40.

[0012] (6) The hair cosmetic composition according to the present invention may be used to inhibit fading of dyed hair (hair cosmetic composition for inhibiting fading).

[0013] (7) In the hair cosmetic composition according to the present invention, the blending amount of reduced starch syrup may be, for example, more than 0.5% by mass and not more than 20% by mass.

[0014] (8) The hair cosmetic composition according to the present invention may be any one selected from a hair wash, a hair care product, and a hair rinse.

[0015] (9) A method for producing a hair cosmetic composition for dyed hair according to the present invention includes a step of blending the composition for inhibiting fading of dyed hair according to the present invention as a raw material. Effect of the Invention

[0016] According to the present invention, it is possible to suppress fading of dyed hair. According to the present invention, by blending a specific reduced starch syrup as a raw material, it is possible to obtain a hair cosmetic that can suppress fading of dyed hair. If the hair cosmetic is used as a hair styling product, hair care product, or hair washing product, and is used in a normal manner on a daily basis, it is possible to easily suppress fading of dyed hair. [Brief description of the drawings]

[0017] [Figure 1]1 is a table showing the raw materials of the shampoo and treatment of the examples. [Diagram 2] This is a bar graph showing the color difference before and after washing for dyed hair washed with water (sample 1), shampoo containing no polyhydric alcohol (sample 2), or shampoo containing polyhydric alcohol (various types of reduced starch syrup, reduced maltose syrup, sorbitol) (samples 3 to 7). [Diagram 3] This is a bar graph showing the color difference before and after washing for dyed hair washed with water (sample 1), shampoo containing no polyhydric alcohol (sample 2), or shampoos containing various polyhydric alcohols (glycerin, low-saccharified reduced starch syrup, low-saccharified starch syrup) (samples 3 to 5). [Figure 4] 1 is a bar graph showing the color difference before and after washing for dyed hair washed with water (sample 1) or shampoos containing 0 to 15 mass% low-saccharified reduced starch syrup (samples 2 to 7). [Diagram 5] Photographs showing the appearance of dyed hair washed with water (sample 1) or shampoos containing 0 to 15 mass% low-saccharified reduced starch syrup (samples 2 to 7). [Figure 6] 1 is a bar graph showing the color difference before and after washing hair dyed with a blue-based oxidative hair dye when the hair was washed with water (sample 1), a shampoo containing no polyhydric alcohol (sample 2), or a shampoo containing low-saccharification reduced starch syrup (sample 3). [Figure 7] This is a photograph showing the appearance of hair dyed with a blue-based oxidative hair dye after washing with water (sample 1), shampoo containing no polyhydric alcohol (sample 2), or shampoo containing low-saccharification reduced starch syrup (sample 3). [Figure 8] This is a photograph showing the appearance of the immersion liquid (water or diluted shampoo) used in the hair washing process after hair dyed with a blue-based oxidative hair dye was washed with water (sample 1), shampoo containing no polyhydric alcohol (sample 2), or shampoo containing low-saccharification reduced starch syrup (sample 3). [Figure 9]1 is a bar graph showing the color difference before and after washing hair dyed with green, yellow-brown, red-brown, and black oxidative hair dyes, when the hair was washed with water (sample 1), a shampoo containing no polyhydric alcohol (sample 2), or a shampoo containing low-saccharified reduced starch syrup (sample 3). [Figure 10] This is a photograph showing the appearance of hair dyed with a green oxidative hair dye after washing with water (sample 1), shampoo containing no polyhydric alcohol (sample 2), or shampoo containing low-saccharification reduced starch syrup (sample 3). [Figure 11] These are photographs showing the appearance of the immersion liquid (water or diluted shampoo) used in the hair washing process after hair dyed with green, yellow-brown, red-brown, and black oxidative hair dyes was washed with water (sample 1), shampoo containing no polyhydric alcohol (sample 2), or shampoo containing low-saccharified reduced starch syrup (sample 3). [Figure 12] This is a bar graph showing the color difference before and after washing hair dyed with a semi-permanent hair dye when the hair was washed with water (sample 1), a shampoo containing no polyhydric alcohol (sample 2), or a shampoo containing low-saccharification reduced starch syrup (sample 3). [Figure 13] 1 is a bar graph showing the color difference before and after heat treatment of hair dyed with a green oxidative hair dye, when the hair was treated with water (sample 1), a treatment containing no polyhydric alcohol (sample 2), or a treatment containing medium-saccharified reduced starch syrup (sample 3). [Figure 14] 1 is a bar graph showing the color difference before and after heat treatment of hair dyed with a green oxidative hair dye, when the hair was treated with water (sample 1), a treatment containing no polyhydric alcohol (sample 2), or a treatment containing low-saccharification reduced starch syrup (sample 3). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The present invention will be described in detail below.

[0019] The present invention provides a composition for suppressing discoloration of dyed hair according to the above two aspects. The compositions for suppressing discoloration of dyed hair according to the two aspects may be collectively referred to as "the composition" or any one of them.

[0020] The above reduced starch syrups (A) to (E) may be collectively referred to as "predetermined reduced starch syrup" or may refer to any one or more of them. The present invention provides a hair cosmetic composition for dyed hair, which contains the specified reduced starch syrup.

[0021] The term "dyed hair" refers to hair that has been dyed. The dyed hair that is the subject of the present invention is hair in which the pigment is present inside the hair (cortex) and the color is expected to last for several days or more.

[0022] The term "suppressing fading of dyed hair" refers to reducing the degree of change in color of dyed hair. In other words, this includes cases where the color of dyed hair does not change at all, and cases where the color change, if any, is small compared to when the present invention is not used.

[0023] The degree of change in hair color can be confirmed by a conventional method. That is, for example, the color of dyed hair is measured (quantified) using a commercially available color measuring device. Next, the color of the same hair after a certain period of time or after a damaging treatment such as washing or heat treatment is similarly quantified using the color measuring device, and the color difference ΔE between these two measurements is calculated. * If the color difference is large, it can be determined that the color change is large, and if the color difference is small, it can be determined that the color change is small.

[0024] As shown in the examples below, a specific reduced starch syrup can suppress fading due to washing, even in hair dyed with a different mechanism of action (semi-permanent hair dye or oxidative hair dye). Also, it can suppress fading due to washing, even in hair dyed with a different pigment (red, blue, green, yellow, brown, or black). Here, it is considered that fading due to washing is caused in part by the washing action of surfactants, alcohol, and the like contained in the hair wash, which causes the dye present inside the hair to flow out. From this, it is considered that a specific reduced starch syrup can at least suppress the outflow of dye from inside the hair during washing. In other words, it can be said that a specific reduced starch syrup can suppress fading by suppressing the outflow of dye from inside the dyed hair, regardless of the dyeing mechanism of action or the type of pigment.

[0025] Furthermore, as shown in the examples described below, the specified reduced starch syrup can suppress fading of dyed hair due to heat even when it is blended into a treatment used in a rinse-off mode. Here, it is believed that one of the causes of fading due to heat is the decomposition of pigments present inside the hair due to heat. From this, it is believed that the specified reduced starch syrup can at least remain on the hair surface or inside the hair even when it is blended into a hair cosmetic used in a rinse-off mode, and suppress pigment decomposition due to heat. In other words, it can be said that the specified reduced starch syrup can suppress pigment decomposition in dyed hair and suppress fading, regardless of whether it is used in a rinse-off or leave-on mode.

[0026] Therefore, the specified reduced starch syrup can be used by blending it into hair cosmetics for dyed hair. In particular, it can be suitably used in hair cosmetics whose purpose includes suppressing fading of dyed hair (hair cosmetics for suppressing fading).

[0027] Specific examples of hair cosmetics include hair washing products (shampoo, hair washing powder, etc.), hair care products (tonic, hair lotion, hair essence, hair treatment, hair conditioner, hair pack, etc.), hair rinse (rinse, etc.), hair styling products (hair oil, camellia oil, styling products, setting products, blow-dry products, brushing products, hair sticks, pomade, hair cream, hair milk, hair solid, hair wax, hair balm, hair spray, hair mist, hair lacquer, hair liquid, hair water, hair foam, hair gel, etc.).

[0028] When a specific reduced starch syrup is blended into a hair washing product, it is possible to suppress fading during hair washing using the hair washing product. On the other hand, when a specific reduced starch syrup is blended into a hair cosmetic product other than a hair washing product (hair styling products, hair care products, hair rinses, etc.), it is possible to expect at least an effect of suppressing fading during subsequent hair washing, and also to suppress fading due to heat applied in daily life, such as with a hair dryer, hair iron, or sunlight.

[0029] "Reduced starch syrup" is a type of sugar alcohol obtained by reducing starch syrup. Here, the raw material starch syrup is obtained by hydrolyzing (saccharifying) starch with acids or enzymes, and is a mixture of monosaccharides (glucose) and polysaccharides (oligosaccharides, dextrin, etc.). Therefore, reduced starch syrup is also a mixture containing two or more types of sugar alcohols, including monosaccharide sugar alcohols and polysaccharide (disaccharides, trisaccharides, tetrasaccharides, or pentasaccharides or more) sugar alcohols.

[0030] Reduced starch syrup may generally be divided into high saccharification reduced starch syrup, medium saccharification reduced starch syrup, and low saccharification reduced starch syrup depending on the degree of saccharification. The present inventors have found that among reduced starch syrups, medium saccharification reduced starch syrup and low saccharification reduced starch syrup, which have a relatively low degree of saccharification, exhibit the effect of inhibiting fading of dyed hair. That is, among the specified reduced starch syrups, the above (A) and (C) correspond to medium saccharification reduced starch syrup, and (B) and (D) correspond to low saccharification reduced starch syrup. Also, (E) corresponds to medium to low saccharification reduced starch syrup.

[0031] In other words, in the present invention, the sugar composition of the medium-saccharification reduced starch syrup can be, for example, (a) less than 30% by mass of monosaccharides and less than 50% by mass of pentasaccharides or more, and more specifically, (c) 2 to 10% by mass of monosaccharides, 15 to 55% by mass of disaccharides, 15 to 65% by mass of trisaccharides, 1 to 15% by mass of tetrasaccharides, and 1 to 38% by mass of pentasaccharides or more.

[0032] In addition, in the present invention, the sugar composition of the low-saccharification reduced starch syrup can be, for example, (a) 50% by mass or more of pentasaccharides, and more specifically, (d) 2 to 10% by mass of monosaccharides, 6 to 21% by mass of disaccharides, 7 to 23% by mass of trisaccharides, 5 to 13% by mass of tetrasaccharides, and 50 to 82% by mass of pentasaccharides or more.

[0033] The "sugar composition" refers to the mass percentage of each sugar relative to the total mass of sugars. In other words, it is the mass percentage of each sugar when the total mass of sugars is taken as 100.

[0034] The sugar composition can be confirmed using high performance liquid chromatography (HPLC). That is, reduced starch syrup or starch syrup is subjected to HPLC as a sample to obtain a chromatogram. In the chromatogram, the sum of the areas of all peaks corresponds to the "total mass of sugars," and the area of ​​each peak corresponds to the "mass of each sugar." Therefore, the mass percentage of each sugar in the sample can be calculated as the ratio of the area of ​​each peak to the sum of the areas of all peaks detected. The HPLC conditions can be set appropriately according to a standard method, and the following conditions can be exemplified. HPLC conditions Column: MCI GEL CK04S (10mm ID x 200mm) Eluent; high purity water Flow rate; 0.4mL / min Injection volume: 20μL Column temperature: 65°C Detection: Differential refractive index detector RI-10A (Shimadzu Corporation)

[0035] Reduced starch syrup can also be specified by the dextrose equivalent of the starch syrup used as the raw material. "Dextrose equivalent (DE)" is a value used as an index of the degree of decomposition of starch syrup, and is the ratio (percentage) of reducing sugars in a sample to the total solid content when the reducing sugars are measured as glucose. The maximum DE value is 100, which means that all of the solid content is glucose, and the smaller the DE, the more oligosaccharides and polysaccharides there are.

[0036] In the present invention, the DE of the raw starch syrup of medium sugar content reduced starch syrup can be exemplified as, for example, 32 or more, 36 or less, 37 or less, 38 or less, 39 or less, and less than 40. Furthermore, the DE of the raw starch syrup of low sugar content reduced starch syrup can be exemplified as, for example, 10 or more, 11 or more, 12 or more, 13 or more, 14 or more, 16 or less, 18 or less, 20 or less, 22 or less, 24 or less, 26 or less, 28 or less, 30 or less, and less than 32. In other words, the DE of the raw starch syrup of medium to low sugar content reduced starch syrup can be exemplified as (e) 10 or more and less than 40.

[0037] The DE of starch syrup can be measured by the following method. <<DE measurement method>> Accurately weigh out 2.5 g of sample and dissolve in water to make 200 mL. Measure out 10 mL of this solution, add 10 mL of 1 / 25 mol / L iodine solution (note 1) and 15 mL of 1 / 25 mol / L sodium hydroxide solution (note 2), and leave in the dark for 20 minutes. Next, add 5 mL of 2 mol / L hydrochloric acid (note 3), mix, and then titrate with 1 / 25 mol / L sodium thiosulfate solution (note 4). When the solution turns slightly yellow near the end of the titration, add 2 drops of starch indicator (note 5) and continue the titration. The end point is when the color of the solution disappears. Measure the blank value using water and calculate the DE using the following formula 1. TIFF2024018962000002.tif49165

[0038] (Note 1) 1 / 25 mol / L iodine solution: Place 20.4 g of potassium iodide and 10.2 g of iodine in a 2 L measuring flask, dissolve in a small amount of water, and then add water up to the marked line. (Note 2) 1 / 25 mol / L sodium hydroxide solution: Place 3.2 g of sodium hydroxide in a 2 L measuring flask, dissolve it in a small amount of water, and then add water up to the marked line. (Note 3) 2 mol / L hydrochloric acid: Gradually add 150 mL of hydrochloric acid to 750 mL of water while stirring. (Note 4) 1 / 25 mol / L sodium thiosulfate solution: Place 20 g of sodium thiosulfate in a 2 L measuring flask, dissolve it in a small amount of water, and then add water up to the marked line. (Note 5) Starch indicator: Dissolve 5 g of soluble starch in 500 mL of water, and dissolve 100 g of sodium chloride in this.

[0039] The reduced starch syrup may be a commercially available product as it is, or may be produced according to a method known to those skilled in the art. Examples of the commercially available product of the reduced starch syrup include "Aquaol #1", "SE 57", "Aquaol #2", "Sweet NT", "SE 30", "SE 100" (all from Bussan Food Science), "PO-10", "PO-20" (all from Mitsubishi Corporation Life Science), etc.

[0040] A known method for producing reduced starch syrup is a reduction reaction in which hydrogen is added to the starch syrup as a raw material. The reduction reaction by hydrogen addition may be carried out, for example, by charging a 40-75% by mass raw material sugar aqueous solution together with a reduction catalyst into a high-pressure reactor, setting the hydrogen pressure in the reactor to 4.9-19.6 MPa and the reaction liquid temperature to 70-180°C, while mixing and stirring, until hydrogen absorption is no longer observed. Thereafter, the reduction catalyst is separated, and the mixture is decolorized and desalted by ion exchange resin treatment, and if necessary, activated carbon treatment, etc., and then concentrated to a predetermined concentration to produce a high-concentration reduced starch syrup.

[0041] The specified reduced starch syrup is blended as a raw material in the normal process of producing hair cosmetics. The blending method can be appropriately performed by a method known to those skilled in the art depending on the type of product, the type and blending amount of other raw materials, the desired feeling of use, etc. Since reduced starch syrup is a polyhydric alcohol, it can be handled in the same way as other polyhydric alcohols that are conventionally blended, such as glycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, and pentylene glycol, to produce hair cosmetics.

[0042] In addition to the reduced starch syrup, the hair cosmetic may contain other ingredients (for example, surfactants, solvents, dispersion media, other polyhydric alcohols, preservatives, chelating agents, pH adjusters, other sugars such as sorbitol, colorants, animal and plant extracts, vitamins, inorganic salts, organic salts, solubilizers, bactericides, moisturizers, antioxidants, humectants, ultraviolet absorbers, thickeners, fragrances, cationic polymers, refreshing agents, cooling agents, oils, etc.) as long as the features of the present invention are not impaired.

[0043] The amount of reduced starch syrup in the hair cosmetic can also be appropriately set depending on the type of product, the type and amount of other raw ingredients, the desired feel when used, etc. For example, from the viewpoint of obtaining a fading suppression effect, the lower limit of reduced starch syrup can be exemplified as more than 0.5% by mass, 0.6% by mass or more, 0.7% by mass or more, 0.8% by mass or more, or 0.9% by mass or more, assuming that the total mass of the cosmetic is 100% by mass. Also, the upper limit can be exemplified as 20% by mass or less, 19% by mass or less, 18% by mass or less, 17% by mass or less, or 16% by mass or less.

[0044] The present invention will be described below based on examples. It should be noted that the technical scope of the present invention is not limited to the characteristics shown in these examples. EXAMPLES

[0045] <Ingredients> The ingredients used were as follows unless otherwise specified. (1) Ingredients for shampoo and treatment The shampoo and treatment were made using the raw materials (all commercially available) shown in Figure 1. The sugar composition and DE value of reduced starch syrup, reduced maltose starch syrup, and starch syrup (DE value of raw sugar for reduced starch syrup and reduced maltose starch syrup) are also shown in Figure 1.

[0046] (2) Hair A hair bundle consisting of bleached hair of level 16 (product name: human hair light brown (16LV), Beaulax) was used.

[0047] (3) Dye The hair was dyed using the dyes [3-1] and [3-2] below. [3-1] Oxidative hair dye Red oxidative hair dye: Product name: Ordeve Addiccy Naked Coral (Milbon Co., Ltd.), active ingredients (1st agent); resorcinol, paraaminophenol, metaaminophenol, 2,4-diaminophenoxyethanol hydrochloride, 2,5-diamine toluene sulfate, 5-amino orthocresol Blue oxidative hair dye: Product name: Ordeve Addiccy Matte Ash (Milbon Co., Ltd.), active ingredients (1st agent); resorcinol, para-aminophenol, meta-aminophenol, 2,4-diaminophenoxyethanol hydrochloride, para-phenylenediamine Green oxidative hair dye: Product name: Ordeve Addicthy Emerald (Milbon Co., Ltd.), active ingredients (1st agent); resorcinol, 2,4-diaminophenoxyethanol hydrochloride, 2,5-diamine toluene sulfate Green oxidative hair dye: Product name: Ordeve Addiccy Sapphire (Milbon Co., Ltd.), active ingredients (1st agent); resorcinol, 2,4-diaminophenoxyethanol hydrochloride, 2,5-diamine toluene sulfate Yellow-brown oxidative hair dye: Product name: Ordeve Beaute Beige Brown (Milbon Co., Ltd.), active ingredients (1st agent); resorcinol, para-aminophenol, meta-aminophenol, para-phenylenediamine, 2,5-diamine toluene sulfate, 5-amino orthocresol Reddish-brown oxidative hair dye: Product name: Ordeve Beaute Rouge Brown (Milbon Co., Ltd.), active ingredients (1st agent); resorcinol, para-aminophenol, meta-aminophenol, para-phenylenediamine, 5-amino-o-cresol Black oxidative hair dye: Product name: "Synfree Treatment Hair Color Cream Type 2N" (POLA Co., Ltd.), active ingredients (1st agent): resorcinol, paraphenylenediamine, metaaminophenol In both cases, hydrogen peroxide solution (product name: Ordeve Addicthy Oxy (6% hydrogen peroxide, Milbon Co., Ltd.) was used as the second agent. The oxidative hair dye was mixed with agent 1 and agent 2 in a 1:1 (weight ratio) immediately before use.

[0048] [3-2] Semi-permanent hair dye Product name: "Hoyu Bigen Color Treatment Natural Brown" (Hoyu Co., Ltd.), Ingredients: Water, glycerin, stearyl alcohol, cetanol, behentrimonium chloride, taurine, dimethicone, mineral oil, camellia seed oil, sodium hyaluronate, lactic acid, hydroxyethyl cellulose, cetrimonium chloride, isopropanol, phenoxyethanol, fragrance, (+ / -) HC Yellow 4, HC Blue 2, Basic Blue 75, Basic Brown 16

[0049] <Test Method> Unless otherwise specified, the tests were carried out according to the following methods. (1) Hair Dye The dye was applied to the hair and left to stand for 30 minutes (in the case of oxidation hair dyes) or 15 minutes (in the case of semi-permanent hair dyes), after which it was washed with running water and air-dried to obtain dyed hair.

[0050] (2) Shampoo and treatment formulations The formulations of the shampoo and treatment in this example are shown in Table 1. [Table 1]

[0051] (3) Shampoo manufacturing The raw materials were weighed out to obtain the composition shown in Table 1, and the shampoo was prepared by manually stirring and mixing at room temperature to obtain a homogeneous solution.

[0052] (4) Manufacturing of treatments Shampoos were prepared using the formulation shown in Table 1 and following the steps (1) to (4) below. [1] Weigh out glyceryl stearate, behentrimonium chloride, and cetanol, combine them, and warm them in an 80°C water bath to dissolve. [2] Weigh out purified water and various polyhydric alcohols and heat them in an 80°C water bath. [3] [2] was added to [1] while stirring with a homogenizer (3000 rpm, 2 minutes). [4] After confirming that the temperature of the solution had dropped to around 50°C, phenoxyethanol was added.

[0053] (5) Evaluation of fading by color difference measurement [1] Color measurement 1: The transmittance of dyed hair was measured at wavelengths of 380 to 740 nm using a spectrophotometer (Shimadzu Corporation). From the transmission spectrum, the tristimulus values ​​X, Y, and Z of the XYZ color system were calculated using Equation 2. Next, based on X, Y, and Z, the values ​​of the L*a*b* color system (L*, a*, b*) were calculated using Equation 3. These calculations were performed using the color measurement software COL-UVPC (Shimadzu Corporation) in accordance with the Japanese Industrial Standards (JIS) Z8781-4. JPEG2024018962000004.jpg51165 JPEG2024018962000005.jpg51155 [2] Color measurement 2: For dyed hair after washing or heat treatment, the transmittance was measured using the method described in [1] to obtain L*a*b* values. [3] Calculation of color difference: The measured values ​​of color measurements 1 and 2 (L*a*b* of [1] and [2]) were substituted into the following formula 4 to calculate the color difference ΔE*ab. Formula 4: ΔE*ab=[(ΔL*) 2 +(Δa*) 2 +(Δb*) 2 〕 1 / 2

[0054] Here, the color difference is the distance between two colors in color space (in this embodiment, the color of hair before washing / heat treatment and the color of hair after washing / heat treatment). Therefore, it can be said that the larger the color difference, the easier it is to distinguish the two colors from each other, and the smaller the color difference, the harder it is to distinguish them. For reference, the general guideline in the paint and coating industry for the correspondence between the color difference value and the visual perception is shown in Table 2 (Ishikawa Norio, Color Measurement Basics and Practice, Journal of the Imaging Society of Japan, Vol. 44, No. 6, 2005, pp. 489-498). In addition, the correlation proposed by the National Bureau of Standards (NBS) is shown in Table 3. [Table 2]

[0055] [Table 3]

[0056] Example 1: Examination of polyhydric alcohols (1) Comparison of sugar alcohols The hair was dyed using a red-based oxidative hair dye (color: naked coral) as described in Test Method (1). As the polyhydric alcohol, sorbitol and reduced starch syrup were used to prepare shampoo as described in Test Methods (2) and (3). The amount of polyhydric alcohol in the shampoo was 10% by mass. The shampoo was diluted 7 times with water to prepare a diluted shampoo solution, and the dyed hair was immersed in water or the diluted shampoo solution, incubated at 40°C for 20 minutes, and then washed with running water for 30 seconds (hair washing process). It was then air-dried. In the hair washing process, the hair bundle using water was sample 1, the hair bundle using a shampoo not containing a polyhydric alcohol was sample 2, and the hair bundle using a shampoo containing medium saccharification reduced starch syrup, low saccharification reduced starch syrup, sorbitol, reduced maltose starch syrup, and high saccharification reduced starch syrup, respectively, were sample 3 to 7. The color difference before and after washing of samples 1 to 7 was measured by the method described in Test Method (5). The results are shown in Figure 2.

[0057] As shown in Figure 2, Sample 5 (sorbitol), Sample 6 (reduced maltose starch syrup) and Sample 7 (highly saccharified reduced starch syrup) had a greater color difference than Sample 2 (no polyhydric alcohol). In contrast, Sample 3 (medium saccharified reduced starch syrup) and Sample 4 (low saccharified reduced starch syrup) had a smaller color difference than Sample 2. Dyed hair washed with a shampoo containing medium to low saccharified reduced starch syrup had a smaller color difference before and after washing compared to when a shampoo containing no polyhydric alcohol was used. These results demonstrate that medium to low saccharified reduced starch syrup can suppress fading of dyed hair.

[0058] (2) Comparison with glycerin and starch syrup The hair was dyed using a red-based oxidative hair dye (color: naked coral) as described in Test Method (1). Shampoo was produced using glycerin, low-saccharified reduced starch syrup, and low-saccharified starch syrup as polyhydric alcohols as described in Test Methods (2) and (3). The amount of polyhydric alcohol in the shampoo was 5% by mass. The hair was then washed and air-dried by the method described in Example 1 (1). In the hair washing process, the hair bundle using water was sample 1, the hair bundle using a shampoo containing no polyhydric alcohol was sample 2, and the hair bundle using a shampoo containing glycerin, low-saccharified reduced starch syrup, and low-saccharified starch syrup was sample 3, sample 4, and sample 5, respectively. The color difference before and after washing of samples 1 to 5 was measured by the method described in Test Method (5). The results are shown in FIG. 3.

[0059] As shown in FIG. 3, sample 3 (glycerin) had a larger color difference than sample 2 (no polyhydric alcohol), and sample 5 (low-saccharified starch syrup) had a color difference equivalent to that of sample 2. In contrast, sample 4 (low-saccharified reduced starch syrup) had a significantly smaller color difference than sample 2. In other words, dyed hair washed with shampoo containing low-saccharified reduced starch syrup had a smaller color difference before and after washing compared to shampoos not containing polyhydric alcohols or shampoos containing glycerin or low-saccharified starch syrup. These results demonstrate that low-saccharified reduced starch syrup can suppress fading of dyed hair.

[0060] Example 2: Examination of blending amount Hair was dyed using a red-based oxidative hair dye (color: naked coral) as described in Test Method (1). Shampoos were produced as described in Test Methods (2) and (3) with the low sugar reduced starch syrup blended in an amount of 0 to 15% by mass. Next, hair was washed and air-dried using these shampoos as described in Example 1 (1). In the hair washing process, the hair bundles using water were designated Sample 1, and the hair bundles using shampoos containing 0 to 15% by mass of low sugar reduced starch syrup were designated Samples 2 to 7. The color differences of Samples 1 to 7 before and after washing were measured as described in Test Method (5). The results are shown in FIG. 4, and photographs of the appearance of the hair bundles after washing are shown in FIG. 5.

[0061] As shown in Fig. 4, Sample 3 had a larger color difference than Sample 2. In contrast, Samples 4, 5, 6, and 7 had smaller color differences than Sample 2. That is, compared to the case where a shampoo containing 0% low saccharified reduced starch syrup was used, the color difference of dyed hair before and after washing was larger when a shampoo containing 0.5% by mass of the low saccharified reduced starch syrup was used, but the color difference was smaller when a shampoo containing 1 to 15% by mass of the low saccharified reduced starch syrup was used.

[0062] 5, it was visually confirmed that Sample 3 had a similar color intensity to Sample 2, while Samples 4 to 7 were darker than Sample 2. In other words, compared to hair dyed with a shampoo containing 0% low saccharified reduced starch syrup, hair dyed with a shampoo containing 0.5% by mass of the low saccharified reduced starch syrup had a similar color intensity, but hair dyed with a shampoo containing 1 to 15% by mass of the low saccharified reduced starch syrup was darker.

[0063] These results demonstrate that a high color fading inhibition effect can be achieved by incorporating medium to low sugar content reduced starch syrup in a hair wash at a content of more than 0.5% by mass.

[0064] Example 3: Dye study: Blue-based oxidation hair dye The hair was dyed using a blue-based oxidative hair dye (color: matte ash) as described in test method (1). A shampoo was produced using low-saccharification reduced starch syrup as the polyhydric alcohol as described in test methods (2) and (3). The amount of low-saccharification reduced starch syrup in the shampoo was 5% by mass. Next, the hair was washed twice by the method described in Example 1 (1) and then air-dried. In the hair washing process, the hair bundle using water was sample 1, the hair bundle using a shampoo containing no polyhydric alcohol was sample 2, and the hair bundle using a shampoo containing low-saccharification reduced starch syrup was sample 3. The color difference between before and after the second hair washing of samples 1 to 3 was measured by the method described in test method (5). The results are shown in FIG. 6, a photograph of the appearance of the hair bundle after the second hair washing is shown in FIG. 7, and a photograph of the appearance of the immersion liquid (water or shampoo dilution) used in the second hair washing process is shown in FIG. 8.

[0065] As shown in Figure 6, Sample 3 had a smaller color difference than Sample 2. In other words, when hair was washed with a shampoo containing low-saccharified reduced starch syrup, the color difference of dyed hair before and after washing was smaller than when a shampoo not containing polyhydric alcohol was used.

[0066] In addition, as shown in Fig. 7, it was visually confirmed that Sample 3 was darker in color than Sample 2. In other words, compared to hair dyed with a shampoo that did not contain polyhydric alcohol, hair dyed with a shampoo that contained low saccharified reduced starch syrup was darker in color.

[0067] Furthermore, as shown in Figure 8, the diluted shampoo solution of Sample 3 was lighter in color than Sample 2. In other words, the diluted shampoo solution containing low saccharification reduced starch syrup was lighter in color after use than the diluted shampoo solution not containing polyhydric alcohol. This revealed that when shampoo containing low saccharification reduced starch syrup was used, color fading from dyed hair during washing was suppressed.

[0068] These results demonstrate that the fading of dyed hair with a blue-based oxidative hair dye can be suppressed by using medium to low sugar content reduced starch syrup, just as in the case of dyeing hair with a red-based oxidative hair dye (Examples 1 and 2).

[0069] Example 4: Dye examination: Green, yellow-brown, red-brown and black oxidative hair dyes The hair was dyed as described in Test Method (1) using oxidation hair dyes of green (color: emerald), yellow-brown (color: beige brown), red-brown (color: rouge brown) and black (color: black). Shampoos were produced as described in Test Methods (2) and (3) using low-saccharification reduced starch syrup as the polyhydric alcohol. The amount of low-saccharification reduced starch syrup in the shampoo was 5% by mass. The hair was then washed and air-dried as described in Example 1 (1). In the hair washing process, the hair bundle using water was sample 1, the hair bundle using shampoo not containing polyhydric alcohol was sample 2, and the hair bundle using shampoo containing low-saccharification reduced starch syrup was sample 3. The color difference before and after washing of samples 1 to 3 was measured as described in Test Method (5). The results are shown in Figure 9, a photograph of the appearance of the hair bundle after washing (only the sample dyed with a green-based oxidative hair dye is shown as a representative photograph) is shown in Figure 10, and a photograph of the appearance of the immersion liquid (water or diluted shampoo) used in the hair washing process is shown in Figure 11.

[0070] As shown in Figure 9, in hair dyed with any of the green, yellow-brown, red-brown, and black oxidative hair dyes, sample 3 had a smaller color difference than sample 2. In other words, when hair was washed with a shampoo containing low-saccharified reduced starch syrup, the color difference in dyed hair before and after washing was smaller than when a shampoo containing no polyhydric alcohol was used.

[0071] In addition, as shown in Fig. 10, it was visually confirmed that Sample 3 was darker in color than Sample 2. In other words, compared to hair dyed with a shampoo that did not contain polyhydric alcohol, hair dyed with a shampoo that contained low saccharified reduced starch syrup was darker in color.

[0072] Furthermore, as shown in FIG. 11, the diluted shampoo solution of Sample 3 was lighter in color than Sample 2 in dyed hair using any of the green, yellow-brown, red-brown, and black oxidative hair dyes. In other words, the diluted shampoo solution containing low saccharification reduced starch syrup was lighter in color after use than the diluted shampoo solution containing no polyhydric alcohol. This revealed that when using a shampoo containing low saccharification reduced starch syrup, color fading from dyed hair during washing was suppressed.

[0073] These results demonstrate that the use of medium to low sugar content reduced starch syrup can suppress fading of dyed hair, regardless of whether the hair has been dyed with a green, yellow-brown, red-brown or black oxidative hair dye, just as in the case of dyeing with a red or blue oxidative hair dye (Examples 1 to 3).

[0074] <Example 5> Dye examination: semi-permanent hair dye Hair was dyed using a semi-permanent hair dye (color: natural brown) as described in test method (1). Shampoo was produced using low-saccharified reduced starch syrup as the polyhydric alcohol as described in test methods (2) and (3). The amount of low-saccharified reduced starch syrup in the shampoo was 5% by mass. The hair was then washed and air-dried as described in Example 1 (1). In the hair washing process, the hair bundle using water was sample 1, the hair bundle using shampoo containing no polyhydric alcohol was sample 2, and the hair bundle using shampoo containing low-saccharified reduced starch syrup was sample 3. The color difference of samples 1 to 3 before and after washing was measured as described in test method (5). The results are shown in FIG. 12.

[0075] As shown in Fig. 12, sample 3 had a smaller color difference than sample 2. In other words, when hair was washed with a shampoo containing low saccharified reduced starch syrup, the color difference in dyed hair before and after washing was smaller than when a shampoo not containing polyhydric alcohol was used. This result revealed that, even for hair dyed with a semi-permanent hair dye, medium to low saccharified reduced starch syrup can suppress fading of dyed hair, as in the case of dyeing with an oxidative hair dye (Examples 1 to 4).

[0076] Example 6: Evaluation of fading prevention by treatment Hair was dyed using a green oxidative hair dye (color: sapphire) as described in test method (1). Treatments were produced using medium-sugar reduced starch syrup and low-sugar reduced starch syrup as polyhydric alcohols as described in test methods (2) and (3). The amount of medium-sugar reduced starch syrup and low-sugar reduced starch syrup in the treatments was 10% by mass. In addition, 20 g of sodium cocoyl glutamate was uniformly dissolved in 80 g of water to prepare a model shampoo.

[0077] After dyeing, the dyed hair was left for one day, immersed in a solution obtained by diluting the model shampoo 7 times with water, incubated at 40°C for 10 minutes, and then washed with running water for 1 minute. Moisture was removed from the hair with a Kimtowel, and 1g of treatment or water was applied to 4 hair strands, which were then covered with plastic wrap and left at room temperature (approximately 25°C) for 5 minutes. The hair strands to which water was applied were sample 1, the hair strands to which a treatment containing no polyhydric alcohol was applied were sample 2, and the hair strands to which a treatment containing medium saccharification reduced starch syrup or low saccharification reduced starch syrup was applied were sample 3. The hair strands were then washed with running water for 1 minute and air-dried.

[0078] As color measurement 1 of test method (5), samples 1 to 3 were subjected to color measurement before heat treatment. Next, the hair was clamped between hair irons and fixed, and heat-treated by heating at 160 degrees for 10 seconds. After that, as color measurement 2 of test method (5), samples 1 to 3 were subjected to color measurement after heat treatment, and the color difference before and after heat treatment was calculated. The results when medium sugar content reduced starch syrup was used as the polyhydric alcohol are shown in FIG. 13, and the results when low sugar content reduced starch syrup was used are shown in FIG. 14 (N=4 for both).

[0079] As shown in Figure 13, Sample 3 had a smaller color difference than both Sample 1 and Sample 2. In other words, when treated with a treatment containing medium-saccharification reduced starch syrup, the color difference of dyed hair before and after heat treatment was smaller than when no treatment was used or when treatment was used with a treatment not containing polyhydric alcohol.

[0080] 14, sample 3 had a smaller color difference than both sample 1 and sample 2. In other words, when treated with a treatment containing low-saccharified reduced starch syrup, the color difference in dyed hair before and after heat treatment was smaller than when no treatment was used or when treatment was used with a treatment not containing polyhydric alcohol.

[0081] These results demonstrate that when medium to low sugar reduced starch syrup is added to a hair care product, it can inhibit fading of dyed hair, just as when it is added to a hair wash (Examples 1 to 5).

Claims

1. A composition for suppressing the fading of dyed hair, comprising a reduced starch syrup having the sugar composition of (a) or (b) below as an active ingredient, wherein the active ingredient is incorporated into a hair cosmetic to impart to the hair cosmetic an effect of suppressing the fading of dyed hair; (i) 50% by mass or more of pentasaccharides or higher, (a) Monosaccharides make up less than 30% by mass and pentasaccharides or more make up less than 50% by mass.

2. The composition according to claim 1, wherein the sugar composition of (i) is (d) 1 to 10% by mass of monosaccharides, 6 to 21% by mass of disaccharides, 7 to 23% by mass of trisaccharides, 5 to 13% by mass of tetrasaccharides and 50 to 82% by mass of pentasaccharides or more.

3. The composition according to claim 1, wherein the sugar composition of (a) is (c) 2 to 10% by mass of monosaccharides, 15 to 55% by mass of disaccharides, 15 to 65% by mass of trisaccharides, 1 to 15% by mass of tetrasaccharides and 1 to 38% by mass of pentasaccharides or more.

4. A composition for suppressing the fading of dyed hair, comprising as an active ingredient reduced starch syrup obtained by reducing starch syrup having a dextrose equivalent of 10 or more and less than 40, and the composition for which the active ingredient is incorporated into a hair cosmetic to impart to the hair cosmetic an effect of suppressing the fading of dyed hair.

5. Hair cosmetic for dyed hair, containing any of the following reduced starch syrups selected from (d), (c), and (e); (e) Reduced starch syrup having a sugar composition of 1-10% by mass of monosaccharides, 6-21% by mass of disaccharides, 7-23% by mass of trisaccharides, 5-13% by mass of tetrasaccharides, and 50-82% by mass of pentasaccharides or more. (c) Reduced starch syrup having a sugar composition of 2-10% by mass of monosaccharides, 15-55% by mass of disaccharides, 15-65% by mass of trisaccharides, 1-15% by mass of tetrasaccharides, and 1-38% by mass of pentasaccharides or more. (O) Reduced starch syrup obtained by reducing starch syrup with a dextrose equivalent of 10 or more and less than 40.

6. The hair cosmetic according to claim 5, which is a hair cosmetic for suppressing the fading of dyed hair.

7. The hair cosmetic composition according to claim 5, further containing more than 0.5% by mass and 20% by mass or less of the reduced starch syrup.

8. The hair cosmetic according to claim 5, which is selected from a shampoo, a hair tonic, and a hair rinse.

9. A method for producing a hair cosmetic for dyed hair, comprising the step of incorporating the composition described in any one of claims 1 to 4 as a raw material.

10. A method for suppressing fading of dyed hair, comprising the step of incorporating one or more reduced starch syrups selected from (i), (a), and (e) below as raw materials into a hair cosmetic; (i) Reduced starch syrup having a sugar composition of 50% or more by mass of pentasaccharides, (a) Reduced starch syrup having a sugar composition of less than 30% by mass of monosaccharides and less than 50% by mass of pentasaccharides or more, (O) Reduced starch syrup obtained by reducing starch syrup with a dextrose equivalent of 10 or more and less than 40.

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