JP7790692B2 - Oxidative hair dye composition - Google Patents

Description

The present disclosure relates to an oxidative hair dye composition.

Oxidative hair dyes are known as hair dyes. Oxidative hair dyes work by allowing an oxidative dye to penetrate into hair that has been swollen by the action of an alkaline agent, and then using the oxidizing agent to break down the melanin pigment contained in the hair and develop color through oxidative polymerization of the oxidative dye, thereby dyeing the hair.

However, even if the same oxidative hair dye is used, the new growth of hair, i.e., the part that has grown since the previous dyeing treatment, and the previously dyed part of hair, i.e., the part that grew before the previous dyeing treatment, may not achieve the same level of dyeing. In response to this, for example, hair salons may use different oxidative hair dyes to apply to the new growth and previously dyed parts. However, selecting an appropriate oxidative hair dye that will achieve the same level of dyeing can be difficult.

Patent Document 1 describes that an oxidative hair dye composition containing a specific oxidative dye and one or more selected from threonine and serine provides equivalent dyeing results for newly grown and already dyed hair.

JP 2015-59110 A

Hair typically fades during repeated washing after dyeing. Research by the inventors has revealed that because the degree of fading differs between new growth and previously dyed hair, even if the new growth and previously dyed hair are dyed to the same degree immediately after dyeing, the degree of dyeing can become uneven after fading. Specifically, when the degree of dyeing between the new growth and previously dyed hair was rigorously evaluated after fading, it was found that there were cases where the degree of dyeing was uneven in terms of hue, saturation, or brightness.

It was also found that in addition to the degree of dyeing, the feel of the hair may differ between the newly grown hair and the already dyed hair.
One aspect of the present disclosure provides an oxidation hair dye composition that maintains long-lasting uniformity in the dyeing of new growth and previously dyed parts of hair, and that provides a uniform feel to the new growth and previously dyed parts, thereby maintaining the uniform feel to the touch.

One aspect of the present disclosure is an oxidation hair dye composition, which contains (A) a polyhydric alcohol having an IOB value of 3.5 or more, (B) an oily component that is solid or pasty at room temperature, (C) an oxidation dye, and (D) an amino acid or a salt thereof.
In one embodiment of the present disclosure, component (A) may include glycerin.
In one embodiment of the present disclosure, component (B) may include shea butter.

In one embodiment of the present disclosure, the mass ratio (A)/(B) of the content of the component (A) in the oxidative hair dye composition to the content of the component (B) in the oxidative hair dye composition may be 1 or more and 10 or less.
In one embodiment of the present disclosure, the component (C) may contain (C-1) at least one or more selected from α-naphthol, 1,5-dihydroxynaphthalene, and 2,2′-[(4-aminophenyl)imino]bisethanol sulfate.

In one embodiment of the present disclosure, the component (C) may contain at least (C-2) resorcinol.
In one embodiment of the present disclosure, (E) a synthetic cationic polymer may be further contained.

One aspect of the present disclosure provides an oxidation hair dye composition that maintains long-lasting uniformity in dyeing between new growth and previously dyed hair sections, and also provides a uniform feel between the new growth and previously dyed sections, maintaining a long-lasting uniform feel.

An oxidation hair dye composition according to one embodiment of the present disclosure contains (A) a polyhydric alcohol having an IOB value of 3.5 or more, (B) an oily component that is solid or pasty at room temperature, (C) an oxidation dye, and (D) an amino acid or a salt thereof.

As mentioned above, it is difficult to achieve the same degree of dyeing between new hair growth and previously dyed hair, and even if the dyeing is the same immediately after the dyeing process, the dyeing may become uneven after fading. In addition to the dyeing of the hair, the feel of the hair may also be different.

This difference is thought to be due to the different condition of the hair in the new growth section and the previously dyed section. In other words, in the previously dyed section, damage has accumulated from the history of previous dyeing treatments, causing the cuticle to peel off and losing the hydrophobicity that is maintained in healthy hair, making it more susceptible to absorbing excess moisture.

During hair dyeing, the action of alkaline agents causes the hair to swell, making it easier for ingredients such as oxidative dyes and oxidizing agents to penetrate into the hair. However, previously dyed areas, which tend to absorb excess moisture, swell more easily than new growth areas, making these ingredients more likely to penetrate into the hair than new growth areas. As a result, previously dyed areas end up dyed relatively darker than new growth areas. On the other hand, previously dyed areas are more likely to absorb water when washed, making it easier for the dye to wash out of the hair. As a result, after dyeing, the hair fades more in the previously dyed areas than in the new growth areas.

Furthermore, such differences in hair condition directly manifest as differences in the feel of the hair. In particular, previously dyed sections are more likely than newly dyed sections to be dry, rough, difficult to run your fingers through, and prone to catching when combed.
According to the investigations of the present inventors, by using the above component (A) and the above component (B) in combination, it is possible to make the degree of dyeing and feel of the newly dyed and already dyed parts uniform.

It is thought that the polyhydric alcohol (A) with an IOB value of 3.5 or more reduces the amount of water adsorbed in the already dyed area and increases the amount of water adsorbed in the newly dyed area, thereby adjusting the amount of water adsorbed in both areas. Also, the oily component (B) that is solid or paste-like at room temperature is thought to contribute to the hydrophobicity of the already dyed area.
In this way, the components (A) and (B) can make the amount of moisture adsorbed by the newly dyed part and the already dyed part closer to each other, thereby making the dyeing degree and feel of the newly dyed part and the already dyed part uniform.

Furthermore, component (D) remains in the hair for a long time while preventing the oxidative dye (component (C)) from washing away, thereby maintaining the uniformity of the dyeing between the newly grown and already dyed sections for a long time. Component (D) also has the effect of improving the feel of the hair, particularly by reducing the dryness, roughness, and difficulty in running fingers through the hair, which tend to occur in already dyed sections, as well as the tendency for the hair to get caught when combed or combed by hand, thereby improving the feel of the hair, and allowing the uniformity of the feel of the newly grown and already dyed sections to be maintained for a long time.

The oxidation hair dye composition according to one embodiment of the present disclosure will be described in detail below.
[Oxidative hair dye composition]
Examples of oxidative hair dye compositions include multi-component compositions containing a first component containing an alkaline agent and a second component containing an oxidizing agent. The first and second components are mixed and applied to the hair at the time of use. The mixing operation may be performed before or after application to the hair. For example, they may be mixed just before application to the hair, or the first and second components may be taken up with a comb or the like and mixed on the hair using the comb or the like. A multi-component composition may be composed of only two components, the first and second components, or may be composed of three or more components including other components. Furthermore, an oxidative hair dye composition may be composed of only one component.

The form of each component constituting the oxidation hair dye composition and the form in which the components are mixed together at the time of use are not particularly limited. Examples of forms include cream, liquid, powder, tablet, gel, and foam. If foaming is desired at the time of use, this can be achieved using a known foaming device. Examples of known foaming devices include non-aerosol foamers, aerosol foamers, and shakers. In the case of aerosol foamers, known propellants and foaming agents can be used.

[Component (A)]
(A) A polyhydric alcohol with an IOB value of 3.5 or more can be used in combination with component (B) as described above to make the dyeing and feel of the newly grown and already dyed parts of the hair uniform.

IOB stands for Inorganic/Organic Balance. The IOB value is the ratio of a compound's inorganic value to its organic value and is an index of the polarity of an organic compound. Specifically, it is expressed as "IOB value = inorganic value / organic value." A compound's inorganic value and organic value are set according to the various atoms or functional groups, such as a carbon atom with an organic value of 20 and a hydroxyl group with an inorganic value of 100. The IOB value is calculated by integrating the inorganic and organic values of all atoms and functional groups in the organic compound (see, for example, Yoshio Koda, "Organic Conceptual Diagram: Fundamentals and Applications," pages 11-17, Sankyo Publishing, 1984). The IOB value of a compound is calculated using the integrated inorganic and organic values.

(A) Examples of polyhydric alcohols with an IOB value of 3.5 or greater include glycerin, diglycerin, sorbitol, maltitol, erythritol, xylitol, mannitol, glucose, maltose, sucrose, and trehalose. Only one of these may be contained, or two or more may be contained.

As component (A), a polyhydric alcohol with an IOB value of 4 or more is preferred, as this allows for more uniform dyeing and feel between the newly dyed and already dyed areas.
Furthermore, as component (A), it is preferable to contain at least one selected from glycerin, diglycerin, and sorbitol, as this can make the dyeing and feel of the newly dyed and already dyed areas more uniform, and it is more preferable to contain glycerin.

The content of component (A) in the oxidation hair dye composition is preferably 0.01% by mass or more, more preferably 0.03% by mass or more, even more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and even more preferably 0.5% by mass or more. Furthermore, the content of component (A) is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less. A content of component (A) within this range can ensure more uniform dyeing and feel between newly dyed and previously dyed areas.

The content of component (A) in the oxidative hair dye composition refers to the content in the oxidative hair dye composition at the time of use. For example, in the case of a two-component composition, it refers to the content of component (A) in the mixture when the two components are mixed. The same applies to the contents below.

[(B) Component]
(B) The oily component that is solid or pasty at room temperature can be used in combination with component (A) as described above to achieve a more uniform dyeing and feel between the new and already dyed parts of the hair.
In the case of a multi-component composition, component (B) may be contained in any of the first, second, or other components. However, component (B) is preferably contained in the first component containing an alkaline agent, since this allows for more uniform dyeing of the newly dyed and previously dyed areas and the uniformity of dyeing lasts longer. Furthermore, component (B) is preferably contained in the same component as component (A), since this allows for more uniform dyeing of the newly dyed and previously dyed areas and the uniformity of dyeing lasts longer.

Here, an oily component that is solid or pasty at room temperature specifically refers to an oily component that is solid or pasty at 25°C. An oily component that is pasty at 25°C specifically refers to a component that can freely change shape while maintaining a constant volume at 25°C and is able to maintain that changed shape.

Component (B) is preferably at least one selected from vegetable oils, waxes, hydrocarbons, and esters, and is solid or pasty at 25°C.
Examples of vegetable oils include vegetable fats, hydrogenated vegetable oils, and other vegetable oils. Examples of vegetable fats include shea butter, cacao butter, Theobroma grandiflorum seed oil, mango seed oil, and Japan wax. Examples of hydrogenated vegetable oils include hydrogenated coconut oil, hydrogenated castor oil, hydrogenated castor oil stearate, and hydrogenated palm oil. Examples of other vegetable oils include partially hydrogenated isomerized jojoba oil, rice bran fatty acid phytosteryl, oleic acid phytosteryl, and macadamia nut fatty acid phytosteryl.

Examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba wax, lanolin, reduced lanolin, spermaceti wax, rice bran wax, sugarcane wax, palm wax, montan wax, cotton wax, bayberry wax, privet wax, kapok wax, and shellac wax.

Examples of hydrocarbons include ozokerite, paraffin, ceresin, and microcrystalline wax.
Examples of esters include tri(caprylic acid/capric acid/myristic acid/stearic acid)glyceryl, dipentaerythrityl tetra(hydroxystearate/isostearate), dipentaerythrityl hexahydroxystearate, hydroxyalkyl dimer fatty acid ether, and bisdiglyceryl polyacyladipate-2.

Only one of these may be contained, or two or more may be contained.
As component (B), it is preferable to contain vegetable oils and fats, and more preferable to contain vegetable fats, because this can make the dyeing and feel between the newly dyed and already dyed parts more uniform. This is because vegetable oils and fats, particularly vegetable fats, have moderate polarity and are more easily absorbed into hair. As the vegetable fat, it is preferable to contain at least one selected from shea butter and cocoa butter, and more preferable to contain shea butter.

The content of component (B) in the oxidation hair dye composition is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.5% by mass or more. Furthermore, the content of component (B) is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 2% by mass or less. A content of component (B) within this range can ensure more uniform dyeing and feel between newly dyed and previously dyed areas.

The mass ratio (A)/(B) of the content of component (A) in the oxidative hair dye composition to the content of component (B) in the oxidative hair dye composition is preferably 0.05 or more, and more preferably 1 or more. Furthermore, the mass ratio (A)/(B) is preferably 20 or less, and more preferably 10 or less. When the mass ratio (A)/(B) is within this range, the blending balance between components (A) and (B) is good, and the amount of moisture adsorbed to the newly dyed and previously dyed portions can be adjusted more uniformly.

[(C) Component]
The oxidation dye, which is the component (C), is composed of a dye intermediate that develops color by oxidation of itself, and a coupler that develops color by reacting with this.

Examples of dye intermediates include p-phenylenediamine, toluene-2,5-diamine, N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, p-aminophenol, o-aminophenol, p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, 1-hydroxyethyl-4,5-diaminopyrazole, and salts thereof. Examples of salts include hydrochlorides and sulfates. Only one of these may be contained, or two or more may be contained.

Examples of couplers include resorcinol, α-naphthol, 1,5-dihydroxynaphthalene, 2,2'-[(4-aminophenyl)imino]bisethanol, 5-amino-o-cresol, m-aminophenol, 5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine, 2,4-diaminophenoxyethanol, toluene-3,4-diamine, 2,6-diaminopyridine, diphenylamine, N,N-diethyl-m-aminophenol, phenylmethylpyrazolone, and salts thereof. Examples of salts include hydrochlorides and sulfates.

Examples of oxidation dyes other than those mentioned above include oxidation dyes listed in "Standards for Quasi-drug Raw Materials" (published in June 2006 by Yakuji Nipposha).
Only one of these oxidation dyes may be contained, or two or more of them may be contained.

The coupler in component (C) preferably contains at least one selected from (C-1) α-naphthol, 1,5-dihydroxynaphthalene, and 2,2'-[(4-aminophenyl)imino]bisethanol sulfate. Component (C-1) has a relatively large molecular size and tends to remain in the hair, which helps maintain the uniformity of dyeing between the new and previously dyed sections for a longer period of time.

Furthermore, it is preferable to include (C-2) resorcinol as a coupler in component (C). Component (C-2) has the effect of reducing the color difference between the newly dyed and previously dyed areas, making it possible to achieve a more uniform dyeing degree between the newly dyed and previously dyed areas.

The oxidation hair dye composition may contain both the component (C-1) and the component (C-2), or may contain only one of them, but it is preferable that both are contained.
The content of the component (C-1) in the oxidation hair dye composition is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more. Furthermore, the content of the component (C-1) is preferably 5% by mass or less, more preferably 1% by mass or less, and even more preferably 0.5% by mass or less. When the content of the component (C-1) is within this range, the uniformity of the dyeing between the newly dyed portion and the already dyed portion can be maintained for a longer period of time.

The content of component (C-2) in the oxidation hair dye composition is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more. Furthermore, the content of component (C-2) is preferably 5% by mass or less, more preferably 1% by mass or less, and even more preferably 0.5% by mass or less. A content of component (C-2) within this range can ensure more uniform dyeing of the newly dyed and previously dyed areas.

The total content of component (C) in the oxidative hair dye composition is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, as this provides a high hair dyeing effect. There is no particular upper limit to the total content of component (C), but it is preferably 20% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less.

[(D) Component]
As described above, when component (D) is used in combination with components (A) and (B), it is possible to prolong the uniformity of the dyeing and feel between the newly dyed and already dyed areas.

Examples of amino acids include threonine, serine, taurine, glycine, theanine, arginine, lysine, histidine, aspartic acid, and glutamic acid. Examples of salts include hydrochlorides. Only one of these may be contained, or two or more may be contained.

The amino acid is not particularly limited, but preferably contains at least one selected from threonine, serine, and taurine, and more preferably contains threonine.
The content of component (D) in the oxidation hair dye composition is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more. Furthermore, the content of component (D) is preferably 5% by mass or less, more preferably 1% by mass or less, and even more preferably 0.5% by mass or less. When the content of component (D) is within this range, the uniformity of the dyeing and feel between the newly dyed and already dyed areas can be maintained for a longer period of time.

The mass ratio (B)/(D) of the content of component (B) in the oxidation hair dye composition to the content of component ( D ) in the oxidation hair dye composition is preferably 0.3 or more, more preferably 3 or more. Furthermore, the mass ratio (B)/(D) is preferably 300 or less, more preferably 30 or less. When the mass ratio (B)/(D) is within this range, the blending balance between component (B) and component (D) is good, and the uniformity of the dyeing condition and feel between the newly dyed and already dyed parts can be maintained for a longer period.

[(E) component]
The oxidation hair dye composition may contain (E) a synthetic cationic polymer.
A cationic polymer is a polymer that has been cationized by introducing a cationic group, for example, a nitrogen-containing group exhibiting cationicity, such as a quaternary ammonium base. Cationic polymers are broadly classified into natural cationic polymers and synthetic cationic polymers. Natural cationic polymers are polymers obtained by cationizing common naturally occurring polymers, such as cellulose, starch, and guar gum. In contrast, synthetic cationic polymers are polymers obtained by cationizing non-naturally occurring polymers, and are usually synthesized chemically.

While components (A) and (B) have the above-mentioned effects, compositions containing components (A) and (B) tend to make hair feel slightly sticky. In contrast, by further including a cationic polymer, hair stickiness is reduced. Furthermore, synthetic cationic polymers are more easily absorbed into hair than natural cationic polymers, allowing this effect of improving hair feel to last longer.

In addition, like component (D), synthetic cationic polymers also have the effect of preventing the oxidative dye (component (C)) from washing away, thereby prolonging the uniformity of the dyeing between the newly dyed and previously dyed areas. Therefore, by adding component (E) to the above components (A) to (D), the uniformity of the dyeing between the newly dyed and previously dyed areas can be maintained for a longer period of time.

(E) Examples of synthetic cationic polymers include polydimethyldimethylenepyrrolidinium chloride, dimethyldimethylenepyrrolidinium chloride-(meth)acrylamide copolymer, (meth)acrylamide-(meth)acrylic acid-dimethyldiallylammonium chloride copolymer, N,N-dimethylaminoethyl diethyl (meth)acrylate sulfate, N,N-dimethyl polyethylene glycol (meth)acrylate, and cationized polyvinylpyrrolidone. Only one of these may be contained, or two or more may be contained.

As component (E), it is preferable to contain polydimethyldimethylenepyrrolidinium chloride, as this has the effect of improving the feel of the hair and maintaining the uniformity of the feel between the newly dyed and previously dyed parts for a longer period of time.
The content of component (E) in the oxidation hair dye composition is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more. Furthermore, the content of component (E) is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less. When the content of component (E) is within this range, the effect of improving the feel of hair and the uniformity of the feel between the newly dyed and dyed parts can be maintained for a longer period.

[Alkaline agent]
As described above, in the case of a multi-component composition, the alkaline agent is contained in the first component. The pH of the first component is not particularly limited, but is preferably from 8 to 12. The content of the alkaline agent in the oxidation hair dye composition is not particularly limited, but is preferably from 0.5 to 20% by mass.

Examples of alkaline agents include ammonia, ammonium salts, alkanolamines, organic amines, inorganic alkalis, and carbonates.
Examples of ammonium salts include ammonium salts of inorganic acids such as ammonium chloride, ammonium carbonate, ammonium hydrogencarbonate, ammonium sulfate, ammonium phosphate, and ammonium nitrate, and ammonium salts of organic acids such as ammonium citrate, ammonium acetate, ammonium oxalate, and ammonium tartrate.

Examples of alkanolamines include monoethanolamine, diethanolamine, triethanolamine, monopropanolamine, isopropanolamine, dipropanolamine, tripropanolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and 2-amino-2-hydroxymethyl-1,3-propanediol.

Examples of organic amines include 2-amino-2-methyl-1,3-propanediol and guanidine.
Examples of inorganic alkalis include sodium hydroxide and potassium hydroxide.

Examples of carbonates include sodium carbonate, potassium carbonate, ammonium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, ammonium hydrogen carbonate, and guanidine hydrogen carbonate.
Only one of these alkaline agents may be contained, or two or more of them may be contained.

[Oxidizing agent]
As described above, in the case of a multi-component composition, the oxidizing agent is contained in the second component. The pH of the second component is not particularly limited, but is preferably from 1 to 6. The content of the oxidizing agent in the oxidation hair dye composition is not particularly limited, but is preferably from 0.1% by mass to 15% by mass.

Examples of oxidizing agents include hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, potassium percarbonate, sodium perborate, potassium perborate, ammonium persulfate, potassium persulfate, sodium persulfate, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adducts of sulfates, hydrogen peroxide adducts of phosphates, hydrogen peroxide adducts of pyrophosphates, peracetic acid and its salts, performic acid and its salts, permanganates, bromates, and the like. Only one of these may be contained, or two or more may be contained. Persulfates such as ammonium persulfate, potassium persulfate, and sodium persulfate may also be contained as oxidizing aids.

[Other ingredients]
The oxidizing agent composition may contain other components as needed. Examples of other components include solvents, oily components other than the component (B), polyhydric alcohols other than the component (A), higher fatty acids, higher alcohols, silicones, alkyl glyceryl ethers, surfactants, polymers such as natural cationic polymers, preservatives, antioxidants, chelating agents, stabilizers, inorganic salts, direct dyes, pH adjusters, hair growth ingredients, plant extracts, herbal extracts, urea, vitamins, fragrances, and ultraviolet absorbers. Only one of these may be contained, or two or more may be contained.

Solvents include, for example, purified water and other water and organic solvents. Examples of organic solvents include ethanol, n-propanol, isopropanol, methyl cellosolve, ethyl cellosolve, methyl carbitol, ethyl carbitol, benzyl alcohol, benzyloxyethanol, phenethyl alcohol, γ-phenylpropyl alcohol, cinnamic alcohol, anise alcohol, p-methylbenzyl alcohol, α-dimethylphenethyl alcohol, α-phenylethanol, ethylene glycol phenyl ether, phenoxyisopropanol, 2-benzyloxyethanol, N-alkylpyrrolidone, and alkylene carbonate. Only one of these may be contained, or two or more may be contained. Water is preferably contained as the solvent.

Examples of oily components other than component (B) include vegetable oils, hydrocarbons, esters, and the like.
Examples of vegetable oils include argania spinosa kernel oil, olive oil, camellia oil, almond oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, corn oil, rapeseed oil, rice bran oil, rice germ oil, grape seed oil, avocado oil, macadamia nut oil, castor oil, coconut oil, evening primrose oil, apricot kernel oil, persic oil, peach kernel oil, palm oil, and egg yolk oil.

Examples of hydrocarbons include olefin oligomers, polyisobutene, hydrogenated polyisobutene, squalane, polyethylene, liquid paraffin, light isoparaffin, light liquid isoparaffin, isoparaffin, α-olefin oligomers, and synthetic squalane.

Examples of esters include diisopropyl adipate, isopropyl myristate, cetyl ethylhexanoate, isononyl isononanoate, octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, octyldodecyl ricinoleate, cetyl lactate, lanolin acetate, cetyl caprate, glyceryl tricaprylate, diisostearyl malate, dioctyl succinate, diethoxyethyl succinate, and cetyl 2-ethylhexanoate. Only one of these may be contained, or two or more may be contained.

Only one of these oily components may be contained, or two or more of them may be contained.
Examples of polyhydric alcohols other than component (A) include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, 1,3-butylene glycol, etc. Only one of these may be contained, or two or more may be contained.

Examples of higher fatty acids include isostearic acid, oleic acid, etc. Only one of these may be contained, or two or more of these may be contained.
Examples of higher alcohols include cetyl alcohol, 2-hexyldecanol, oleyl alcohol, 2-octyldodecanol, lauryl alcohol, myristyl alcohol, decyltetradecanol, and lanolin alcohol.

Examples of silicones include dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, hydroxyl-terminated dimethylpolysiloxane, highly polymerized silicones with an average degree of polymerization of 650 to 10,000, polyether-modified silicones (e.g., (PEG/PPG/butylene/dimethicone) copolymers), betaine-modified silicones, alkyl-modified silicones, alkoxy-modified silicones, mercapto-modified silicones, carboxy-modified silicones, and fluorine-modified silicones. Only one of these may be contained, or two or more may be contained.

Examples of alkyl glyceryl ethers include batyl alcohol, chimyl alcohol, selachyl alcohol, and isostearyl glyceryl ether. Only one of these may be contained, or two or more may be contained.

Surfactants include cationic surfactants, anionic surfactants, nonionic surfactants, and amphoteric surfactants. In the following description, POE represents a polyoxyethylene chain, and POP represents a polyoxypropylene chain.

Examples of cationic surfactants include lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, cetrimonium methosulfate, behentrimonium methosulfate, behenyl PG trimonium chloride, stearoxypropyltrimonium chloride, arachidyltrimethylammonium chloride, alkyltrimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, lanolin fatty acid aminopropylethyldimethylammonium ethyl sulfate, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin, methacryloyloxyethyltrimethylammonium chloride, behenyltrimethylammonium methylsulfate, behenyldimethylamine, behenic acid diethylaminoethylamide, behenic acid dimethylaminopropylamide, behenic acid dimethylaminoethylamide, stearyldimethylamine, palmitoxypropyldimethylamine, stearoxypropyldimethylamine, and stearic acid dimethylaminopropylamide.

Examples of anionic surfactants include alkyl ether sulfates, alkyl sulfates, alkyl ether sulfate ester salts, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylate salts, α-sulfonic acid salts, N-acylamino acid surfactants, phosphate mono- or diester surfactants, sulfosuccinate esters, N-alkyloylmethyl taurine salts, and derivatives thereof. Examples of counterions to the anionic groups of these surfactants include sodium ions, potassium ions, and triethanolamine. More specifically, examples of alkyl ether sulfate ester salts include sodium POE lauryl ether sulfate. Examples of alkyl sulfate salts include sodium lauryl sulfate and sodium cetyl sulfate. Examples of alkyl sulfate derivatives include sodium POE lauryl sulfate. Examples of sulfosuccinate esters include disodium lauryl sulfosuccinate. Examples of N-alkyloylmethyltaurine salts include sodium N-stearoyl-N-methyltaurine.

Examples of amphoteric surfactants include cocobetaine, lauramidopropyl betaine, cocamidopropyl betaine, sodium lauroamphoacetate, sodium cocoamphoacetate, coconut oil fatty acid amidopropyl betaine, lauryl betaine (lauryl dimethylaminoacetic acid betaine), and sodium lauryl aminopropionate.

Examples of nonionic surfactants include ether-type nonionic surfactants, ester-type nonionic surfactants, and alkyl glucosides.
Examples of ether-type nonionic surfactants include POE cetyl ether, POE stearyl ether, POE behenyl ether, POE oleyl ether, POE lauryl ether, POE octyldodecyl ether, POE hexyldecyl ether, POE isostearyl ether, POE nonylphenyl ether, POE octylphenyl ether, POE/POP cetyl ether, and POE/POP decyltetradecyl ether.

Examples of ester-type nonionic surfactants include POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monopalmitate, POE sorbitan monolaurate, POE sorbitan trioleate, POE glycerin monostearate, POE glycerin monomyristate, POE sorbitol tetraoleate, POE sorbitol hexastearate, POE sorbitol monolaurate, POE sorbitol beeswax, polyethylene glycol monooleate, and polyethylene glycol monostearate. Examples include ricin, polyethylene glycol monolaurate, lipophilic glyceryl monooleate, lipophilic glyceryl monostearate, self-emulsifying glyceryl monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monolaurate, sucrose fatty acid esters, decaglyceryl monolaurate, decaglyceryl monostearate, decaglyceryl monooleate, and decaglyceryl monomyristate.

Examples of alkyl glucosides include alkyl (C ₈ -C ₁₆ ) glucoside, POE methyl glucoside, and POE dioleate methyl glucoside.
Only one of these surfactants may be contained, or two or more of them may be contained.

Examples of preservatives include phenoxyethanol, paraben, methylparaben, and sodium benzoate. Examples of antioxidants include ascorbic acid and anhydrous sodium sulfite. Examples of chelating agents include ethylenediaminetetraacetate, diethylenetriaminepentaacetate, and hydroxyethanediphosphonate. Examples of stabilizers include phenacetin, 8-hydroxyquinoline, acetanilide, and sodium pyrophosphate. Examples of inorganic salts include sodium chloride. Only one of these ingredients may be contained, or two or more may be contained.

[Preparation of Oxidative Hair Dye Composition]
A cream-like first agent containing each component shown in Tables 1 to 5 and a cream-like second agent shown in Table 6 were prepared in a conventional manner, and the first and second agents were mixed to obtain oxidation hair dye compositions. In each table, the unit of the numerical values representing the content of each component is % by mass.

[evaluation]
The oxidation hair dye compositions thus prepared were evaluated as follows. The evaluation results are shown in the lower columns of Tables 1 to 5.

(Evenness of dyeing immediately after dyeing)
The tip 5 cm of a 10 cm long white hair bundle sample was bleached using a bleach (Promaster (registered trademark) EX LT, manufactured by Hoyu Corporation). Next, the prepared oxidation hair dye composition was applied to the entire hair bundle sample using a brush in a ratio of 1 g of oxidation hair dye composition per 1 g of hair bundle sample, and left to stand at room temperature for 30 minutes. Next, the oxidation hair dye composition was rinsed off with water, and the hair bundle sample was washed twice with a shampoo composition (Bigen (registered trademark) Treatment Shampoo, manufactured by Hoyu Corporation). Next, the hair bundle sample was dried with warm air.

The root portion of the unbleached hair bundle sample can be likened to the new growth portion of hair, while the tip portion of the bleached hair bundle sample can be likened to the dyed portion of hair. Therefore, by comparing the degree of dyeing of both samples after dyeing, it is possible to evaluate whether the degree of dyeing is equivalent between the new growth portion of hair and the dyed portion of hair.

Ten expert panelists visually inspected the dyeing of the entire hair bundle sample under a standard light source and scored the uniformity of dyeing between the new and previously dyed sections according to the following criteria. Dyeing was evaluated primarily in terms of hue, saturation, and brightness.

4 points: No difference in the degree of dyeing was observed.
3 points: Almost no difference in the degree of dyeing.
2 points: There is a slight difference in the degree of dyeing.
1 point: There is a clear difference in the degree of dyeing.

The average scores of the 10 panelists were calculated, and an average score of 3.6 or higher was rated as "A: Excellent (5)", 2.6 to less than 3.6 was rated as "B: Good", 1.6 to less than 2.6 was rated as "C: Fairly poor", and less than 1.6 was rated as "D: Poor".

(Uniformity of texture immediately after dyeing)
Ten expert panelists touched the entire hair bundle sample prepared in the above "Uniformity of dyeing immediately after dyeing" with their fingers and compared the difference in feel between the newly grown and already dyed parts, and scored the uniformity of feel according to the following criteria.

4 points: There is absolutely no difference in feel.
3 points: There is almost no difference in feel.
2 points: There is a slight difference in feel.
1 point: There is a clear difference in feel.

The average scores of the 10 panelists were calculated, and an average score of 3.6 or higher was rated as "A: Excellent (5)", 2.6 to less than 3.6 was rated as "B: Good", 1.6 to less than 2.6 was rated as "C: Fairly poor", and less than 1.6 was rated as "D: Poor".

(Evenness of dyeing after washing)
The following test was conducted to evaluate the uniformity of dyeing of dyed hair bundle samples after a certain number of washings.
The hair bundle sample prepared in the above "Evenness of dyeing immediately after dyeing" was immersed for 20 minutes in a 2% aqueous solution of sodium lauryl sulfate at 50° C. Next, the hair bundle sample was removed from the 2% aqueous solution of sodium lauryl sulfate, washed twice with a shampoo composition ("Bigen (registered trademark) Treatment Shampoo" manufactured by Hoyu Corporation), and then dried with warm air.

Afterwards, 10 expert panelists visually inspected the dyeing of the entire hair bundle sample after washing under a standard light source, and scored the uniformity of dyeing between the new and previously dyed sections according to the following criteria. Dyeing was evaluated primarily in terms of hue, saturation, and brightness.

4 points: No difference in the degree of dyeing was observed.
3 points: Almost no difference in the degree of dyeing.
2 points: There is a slight difference in the degree of dyeing.
1 point: There is a clear difference in the degree of dyeing.

The average scores of the 10 panelists were calculated, and an average score of 3.6 or higher was rated as "A: Excellent (5)", 2.6 to less than 3.6 was rated as "B: Good", 1.6 to less than 2.6 was rated as "C: Fairly poor", and less than 1.6 was rated as "D: Poor".

(Uniformity of feel after washing)
Ten expert panelists touched the entire washed hair bundle sample prepared in the above "Uniformity of dyeing after washing" with their fingers and compared the difference in feel between the newly dyed and already dyed parts, and scored the uniformity of feel according to the following criteria.

4 points: There is absolutely no difference in feel.
3 points: There is almost no difference in feel.
2 points: There is a slight difference in feel.
1 point: There is a clear difference in feel.

The average scores of the 10 panelists were calculated, and an average score of 3.6 or higher was rated as "A: Excellent (5)", 2.6 to less than 3.6 was rated as "B: Good", 1.6 to less than 2.6 was rated as "C: Fairly poor", and less than 1.6 was rated as "D: Poor".

[Consideration]
As shown in Examples 1 to 22, the oxidation hair dye compositions containing components (A) to (D) provided uniform dyeing and texture between the new growth and already dyed parts of the hair, and this uniformity lasted for a long time.

As shown in Examples 1 to 4, the compositions of Examples 1 and 2, which contain a synthetic cationic polymer (component (E)) as the cationic polymer, were able to maintain the uniformity of dyeing and feel between the newly dyed and already dyed areas for a longer period of time than the composition of Example 3, which contains a natural cationic polymer, and the composition of Example 4, which contains no cationic polymer whatsoever.

In addition, when Example 1 and Example 3 were compared separately in terms of the degree of stickiness of hair immediately after the hair dyeing treatment, it was found that Example 1, which contains a synthetic cationic polymer (E) as the cationic polymer, was more effective in reducing hair stickiness than Example 3, which contains a natural cationic polymer.

As shown in Examples 1 and 5, the composition of Example 1, which contained component (C-2) as the component (C), was able to achieve more uniform dyeing between the newly dyed and previously dyed areas than the composition of Example 5, which did not contain component (C-2).

As shown in Examples 1, 6 to 8, the compositions of Examples 1, 6, and 7, which contained component (C-1) as component (C), were able to achieve more uniform dyeing between the newly dyed and previously dyed areas than the composition of Example 8, which did not contain component (C-1).

As shown in Examples 1, 9, and 10, the compositions of Examples 1 and 10, which contain vegetable fat as component (B), were able to achieve more uniform dyeing between the newly dyed and previously dyed areas than the composition of Example 9, which contains hydrocarbons as component (B).

As shown in Examples 1, 15, and 16, the composition of Example 1, which contained glycerin as component (A), and the composition of Example 15, which contained sorbitol, maintained uniformity of dyeing and feel for a longer period of time than the composition of Example 16, which contained diglycerin.

As shown in Examples 25 and 26, even when serine or taurine was used instead of threonine as component (D), the uniformity of the dyeing and feel was maintained for a long time.
As shown in Examples 11 to 14, 17 to 20, 21 to 24, and 27 to 30, the uniformity of the dyeing and feel was maintained for a long time even when the content of each component was changed.
On the other hand, as shown in Comparative Example 1, with the composition not containing component (A), the degree of dyeing and the uniformity of the feel were not uniform even immediately after dyeing.

Furthermore, as shown in Comparative Examples 2 and 3, even when a composition containing propylene glycol or dipropylene glycol, which is a polyhydric alcohol with an IOB value of less than 3.5, instead of (A) a polyhydric alcohol with an IOB value of 3.5 or more, was used, the degree of dyeing and the uniformity of the feel were not uniform immediately after dyeing the hair.

As shown in Comparative Example 4, with the composition not containing component (B), the degree of dyeing and the uniformity of the feel were not uniform immediately after dyeing.
Furthermore, as shown in Comparative Examples 5 and 6, even in the case of a composition containing liquid paraffin or cetyl ethylhexanoate, which is an oily component that is liquid at room temperature, instead of (B) an oily component that is solid or pasty at room temperature, the degree of dyeing and the uniformity of the feel were not uniform immediately after dyeing the hair.

As shown in Comparative Example 7, the composition containing neither component (A) nor component (B) was less able to maintain the uniformity of dyeing and feel compared to the compositions of Comparative Examples 1 to 6, which contained either component (A) or component (B).

As shown in Comparative Example 8, with a composition that did not contain component (D), the color and feel immediately after dyeing were uniform, but this uniformity did not last long.

Claims (7)

An oxidation hair dye composition comprising:
(A) a polyhydric alcohol having an IOB value of 3.5 or more;
(B) an oily component that is solid or pasty at room temperature;
(C) an oxidation dye;
(D) an amino acid or a salt thereof;
Contains
The component (A) contains at least one or more selected from glycerin, diglycerin, and sorbitol,
The (B) component is shea butter,
The oxidation hair dye composition, wherein the mass ratio (A)/(B) of the content of the component (A) in the oxidation hair dye composition to the content of the component (B) in the oxidation hair dye composition is 0.5 or more and 20 or less . The component (D) contains at least one or more selected from threonine, serine, and taurine,
2. The oxidative hair dye composition according to claim 1, wherein the mass ratio (B)/(D) of the content of the component (B) in the oxidative hair dye composition to the content of the component (D) in the oxidative hair dye composition is 5 or more and 20 or less. 3. The oxidation hair dye composition according to claim 1, wherein the component (A) contains at least glycerin. The oxidative hair dye composition according to any one of claims 1 to 3, wherein the mass ratio (A)/(B) of the content of component (A) in the oxidative hair dye composition to the content of component (B) in the oxidative hair dye composition is 1 or more and 10 or less. The oxidative hair dye composition according to any one of claims 1 to 4, wherein the component (C) contains at least one selected from (C-1) α-naphthol, 1,5-dihydroxynaphthalene, and 2,2'-[(4-aminophenyl)imino]bisethanol sulfate. The oxidative hair dye composition according to any one of claims 1 to 5, wherein the component (C) contains at least (C-2) resorcinol. The oxidative hair dye composition according to any one of claims 1 to 6, further comprising (E) a synthetic cationic polymer.