JP2021031477A - Composition for scalp protection - Google Patents

Abstract

To provide a composition for scalp protection that has the protection power to protect the user's scalp from dyeing with a coloring agent, can be easily washed away, and can omit an emulsifying process in hair coloring.SOLUTION: A composition for scalp protection contains vaseline of 10-99.8 mass% relative to the total mass, and hydrophilic silica particles of 0.2-8 mass% relative to the total mass. Before hair treatment, the composition is applied to the user's scalp, so that a protective film to protect the scalp is formed on the scalp.SELECTED DRAWING: None

Description

The present invention relates to a scalp protective composition, and more particularly to a scalp protective composition which has a protective power to protect the scalp from dyeing with a coloring agent and can be easily washed away.

Conventionally, hair treatments such as perm treatment and hair dyeing treatment are known. When the hair treatment agent used for such hair treatment adheres to the scalp, the scalp may be irritated, causing pain and inflammation.

In addition, when a hair treatment agent having a dyeing or discoloring action adheres to the scalp, the scalp may be dyed or discolored. Therefore, a scalp protective agent for protecting the scalp from the hair treatment agent by applying it to the scalp in advance before the hair treatment is known.

Such a scalp protective agent is required not only to prevent dyeing and discoloration of the scalp but also to be easy to wash off, and a scalp protective agent that can be washed away after use has been reported (for example, a patent). Reference 1).

Japanese Unexamined Patent Publication No. 2016-160187

However, the scalp protective agent of Patent Document 1 still has room for improvement in terms of ease of washing. Specifically, for example, in a hair salon, hair coloring is performed as follows. That is, first, a scalp protective agent is applied to the scalp, and then a coloring agent or the like is applied to the hair to color the hair. After that, emulsification is performed as a pretreatment for washing away the coloring agent and the like. This emulsification is performed by mixing a scalp protective agent on the scalp with a coloring agent or the like. After that, shampoo and the like are applied to wash away the coloring agent and the scalp protective agent.

In the scalp protective agent of Patent Document 1, the above emulsification is still a necessary work, and the colorant and the scalp protective agent cannot be sufficiently washed off without emulsification.

This emulsification is an operation in which the hair treatment practitioner touches the scalp of the practitioner with bare hands or gloves and mixes the coloring agent and the scalp protective agent. During this work, not only with bare hands, but even with gloves on, if there are small holes in the gloves, the practitioner's fingertips will come into contact with the coloring agent, etc., and the practitioner's fingertips will be dyed. Sometimes. In addition, the practitioner may not wear gloves in consideration of the feeling that the practitioner receives. Further, the emulsification may cause the sebum to be washed away excessively, which causes the skin to become dry for the person to be treated such as dry skin. In addition, the emulsification may wash away makeup and sunscreen, and the person to be treated needs to reapply these after coloring.

For these reasons, it has been desired to develop a scalp protective composition that can be easily washed away and can omit the emulsification work in hair coloring.

The present invention has been made in view of the problems of the prior art, and the problem is that it has a protective power to protect the scalp from dyeing with a coloring agent and can be easily washed away. It is an object of the present invention to provide a scalp protective composition capable of omitting emulsification work in hair coloring.

According to the present invention, the following compositions for protecting the scalp are provided.

[1] Vaseline, which is 10 to 99.8% by mass of the total mass, and
Contains hydrophilic silica particles, which is 0.2-8% by mass of the total mass.
A scalp protective composition that is applied to the scalp to form a protective film that protects the scalp on the scalp before the treatment of hair.

[2] The composition for protecting the scalp according to the above [1], further containing 5 to 80% by mass of a heavy liquid isoparaffin based on the total mass.

[3] The composition for protecting the scalp according to the above [1] or [2], which has a viscosity at 24 ° C. of 300 to 340,000 mPas.

[4] The scalp protection according to any one of [1] to [3] above, which contains an anionic surfactant, an amphoteric surfactant, or a nonionic surfactant and does not contain a cationic surfactant. Composition.

[5] The composition for protecting the scalp according to the above [4], which further contains hydrophobic silica particles which are 0.1 to 8.0% by mass of the total mass.

[6] The composition for protecting the scalp according to any one of [1] to [5] above, wherein the total of the blending ratio of the hydrophilic silica particles and the blending ratio of the hydrophobic silica particles is 0.3 to 8% by mass. Stuff.

[7] The value of the ratio of the mixing ratio of the hydrophobic silica particles to the mixing ratio of the hydrophilic silica particles (the mixing ratio of the hydrophobic silica particles / the mixing ratio of the hydrophilic silica particles) is 0.0125 to 40. The composition for protecting the scalp according to any one of [1] to [6].

The scalp protective composition of the present invention has a protective power to protect the scalp from dyeing with a coloring agent and can be easily washed away, and as a result, emulsification work in hair coloring can be omitted.

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments, and is described below based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that those having been appropriately modified, improved, etc. from the embodiments of the above are also within the scope of the present invention.

[1] Scalp protection composition:
The scalp protective composition of the present invention is used for the scalp before the hair treatment, and contains petrolatum which is 10 to 99.8% by mass of the total mass and 0.2 to 8% by mass of the total mass. It contains hydrophilic silica particles.

This scalp protective composition is applied to the scalp before the hair treatment to form a protective film on the scalp, and in the hair treatment performed after the protective film is formed, the scalp is dyed with a coloring agent or the like to remove the scalp. Has protective power to protect. That is, it is possible to prevent the scalp from being dyed or discolored by a coloring agent or the like.

Furthermore, the scalp protective composition of the present invention can be easily washed away. Therefore, the emulsification work in hair coloring can be omitted. That is, the scalp protection composition of the present invention is easily washed away to the extent that the emulsification work in hair coloring can be omitted. The scalp protection composition of the present invention is easy to wash off by itself, and can also be washed with a coloring agent or the like. Specifically, when a coloring agent or the like is attached to the protective film formed by the scalp protective composition of the present invention, it means that the scalp is protected from the coloring agent or the like by this protective film and is not dyed. Of course, this colorant or the like can be easily washed away together with the protective film simply by applying water or the like. Here, "omitting the emulsification work" means that the coloring practitioner touches the scalp of the practitioner with bare hands or gloves and mixes the coloring agent and the scalp protective agent as in the conventional case. Means not to do. According to the scalp protection composition of the present invention, it is not necessary to perform the above-mentioned work, but even if the coloring agent or the like remains on the protective film, when washing the hair with shampoo or the like. By applying a small amount of this shampoo or the like, the coloring agent and the protective film can be easily washed away.

Here, for example, in a hair salon, hair coloring is performed as follows. That is, first, a scalp protective agent is applied to the scalp, and then a coloring agent or the like is applied to the hair to color the hair. After that, emulsification is performed as a pretreatment for washing away the coloring agent and the like. This emulsification is performed by mixing a scalp protective agent on the scalp with a coloring agent or the like. After that, shampoo and the like are applied to wash away the coloring agent and the scalp protective agent.

With conventional scalp protective agents, the above emulsification is still a necessary work, and the situation is that the coloring agent and the scalp protective agent cannot be sufficiently washed off without emulsification.

In particular, when petrolatum is blended in the scalp protection composition, this petrolatum has a protective power to protect the scalp from a coloring agent or the like, but from the viewpoint of rinsing, it is very sticky and causes difficulty in rinsing. It becomes.

This emulsification is an operation in which the hair treatment practitioner touches the scalp of the practitioner with bare hands or gloves and mixes the coloring agent and the scalp protective agent. During this work, not only with bare hands, but even with gloves on, if there are small holes in the gloves, the practitioner's fingertips will come into contact with the coloring agent, etc., and the practitioner's fingertips will be dyed. Sometimes. In addition, the practitioner may not wear gloves in consideration of the feeling that the practitioner receives. Further, the emulsification may cause the sebum to be washed away excessively, which causes the skin to become dry for the treated person (particularly, the treated person such as dry skin). In addition, the emulsification may wash away makeup and sunscreen, and the person to be treated needs to reapply these after coloring.

The scalp protection composition of the present invention can be used as a protective agent against hair treatment agents such as colorants usually used in hair treatment. Here, examples of the hair treatment agent (that is, a coloring agent, etc.) include a hair dye, a bleaching agent, and the like.

Examples of hair dyes include alkaline oxidative hair dyes, acidic oxidative hair dyes, acidic hair dyes (hair manicure), HC hair dyes, basic hair dyes, so-called henna, legal pigments (for example, Black 401), and silver salts. , Pigments and the like.

[1-1] Vaseline:
The scalp protective composition of the present invention contains petrolatum. This petrolatum is one of the components that exerts a protective effect on the scalp.

The content ratio of petrolatum is 10 to 99.8% by mass, preferably 40 to 99.8% by mass, and more preferably 45 to 99.8% by mass based on the total mass. When the content ratio is in the above range, a high protective effect can be obtained.

[1-2] Hydrophilic silica particles:
The hydrophilic silica particles act to wrap petrolatum when they come into contact with water or the like. According to the present invention, in a scalp protection composition containing petrolatum as a base material in a predetermined ratio, extremely excellent washing performance is exhibited by containing hydrophilic silica particles in a predetermined ratio. Since it has such an extremely excellent wash-out performance, it is possible to avoid performing the emulsification work that has been normally performed in the past (that is, omit the emulsification work). By blending hydrophilic silica particles, it is possible to prevent dripping of the scalp protection composition. Specifically, the scalp protective composition is applied to the scalp, a coloring agent or the like is further applied to the hair, and then the hair is left as it is for several minutes. At the time of this leaving, a protective film is formed. The scalp protection composition in the state of being dripping may cause dripping. By blending the hydrophilic silica particles, this dripping can be prevented and the shape retention of the protective film formed by the scalp protective composition can be improved. This is because when dripping occurs, the scalp protective composition permeates the eyes of the treated person, which makes the treated person feel uncomfortable.

The hydrophilic silica particles are not particularly limited in terms of average particle size and specific surface area, and can be appropriately set.

Specific examples of the hydrophilic silica particles include AEROSIL 90, AEROSIL 130, AEROSIL 150, AEROSIL 200, AEROSIL 255, AEROSIL 300, AEROSIL 380, AEROSIL OX 50, AEROSIL TT 600, AEROSIL 200 SP, AEROSIL 300. Examples include 200 Pharma, AEROSIL 300 Pharma, AEROSIL 300/30 (manufactured by Ebonic), HDK S13, HDK V15, HDK V15P, HDK N20, HDK N20P, HDK T30, HDK T40 (manufactured by Asahi Kasei Wacker Silicone). ..

Here, the hydrophilic silica particles are silica particles in which a hydroxyl group is present on the surface and hydrogen of the hydroxyl group is not hydrophobized (not substituted with a hydrophobic group).

The content ratio of the hydrophilic silica particles is 0.2 to 8% by mass, preferably 2.5 to 8% by mass, and 4.5 to 8% by mass, based on the total mass of the scalp protection composition. Is even more preferable. By setting the above range, it can be easily washed off by applying water or hot water from a shower or the like. If the content of the hydrophilic silica particles is less than 0.2% by mass of the total mass of the scalp protective composition, it cannot be easily washed away. If the content of the hydrophilic silica particles exceeds 8% by mass of the total mass of the scalp protective composition, the scalp protective composition will solidify.

[1-3] Heavy liquid isoparaffin:
The scalp protection composition of the present invention may further contain heavy liquid isoparaffin. By containing this heavy liquid isoparaffin, petrolatum and heavy liquid isoparaffin are combined to exert a high protective effect from coloring agents and the like on the scalp.

The content ratio of the heavy liquid isoparaffin is preferably 5 to 80% by mass, more preferably 7 to 80% by mass, based on the total mass of the scalp protection composition. Within the above range, in combination with petrolatum, a high protective effect from coloring agents and the like on the scalp is exhibited. If the content of the heavy liquid isoparaffin is less than 5% by mass of the total mass of the scalp protective composition, the ease of rinsing from the scalp is reduced, and the protective effect of the scalp against a coloring agent or the like may be reduced. .. Even if the content of the heavy liquid isoparaffin exceeds 80% by mass of the total mass of the scalp protective composition, the ease of rinsing from the scalp may be reduced, and the protective effect of the scalp against a coloring agent or the like may be reduced. .. The heavy liquid isoparaffin may be composed of only one kind, or may be composed of two or more kinds.

[1-4] Hydrophobic silica particles:
The scalp protection composition of the present invention may further contain hydrophobic silica particles. That is, the scalp protection composition of the present invention may contain both hydrophobic silica particles and hydrophilic silica particles. By containing the hydrophobic silica particles, the protective power of the protective film formed by the scalp protective composition is further improved. The functions of the hydrophobic silica particles are as follows. That is, the hydrophobic silica particles reinforce the protective power of the scalp with petrolatum and the heavy fluid isoparaffin compounded as needed. Furthermore, the hydrophobic silica particles play a role in assisting the action of hydrophilic silica when a large amount of water (moisture) for rinsing is supplied to the scalp. The action of the hydrophilic silica is that when the hydrophilic silica comes into contact with water for rinsing, it gels so as to wrap around petrolatum and the like. By gelling, it becomes a state where it can be easily washed away by water or the like.

The hydrophobic silica particles preferably have an average particle size of 1 nm to 15 μm, more preferably 5 nm to 1 μm, and particularly preferably 5 to 50 nm. Within such a range, the hydrophobic silica particles are more uniformly dispersed in petrolatum. As a result, a high protective effect on the scalp can be obtained.

Here, the average particle size of the primary particles referred to in the present specification is measured by a dynamic scattering method (photon correlation method) when the average particle size of the primary particles is 1 μm or less, and the particle size analysis method “CONTIN” is used. It is a measured value (mode diameter) derived from the number distribution using the method. When the average particle size of the primary particles is more than 1 μm, it is a value (median diameter) measured by a laser diffraction method.

Specific examples of the hydrophobic silica particles include AEROSIL R972, AEROSIL R974, AEROSIL R104, AEROSIL R106, AEROSIL R202, AEROSIL R805, AEROSIL R812, AEROSIL R812S, AEROSIL R816, AEROSIL R7200, AEROSIL R7200, AEROSIL R8 , AEROSIL R972 Pharma (Ebonic), VM-2270 Aerogel Fine Particles (Dow Corning), HDK H15, HDK H15P, HDK H20, HDK H30, HDK H18, HDK H2000, HDK H1018, HDK H20 (Made by Asahi Kasei Wacker Silicone Co., Ltd.) and the like.

The content ratio of the hydrophobic silica particles is preferably 0.1 to 8.0% by mass, more preferably 0.1 to 6.0% by mass, based on the total mass of the scalp protection composition. It is particularly preferable that the content is .0 to 6.0% by mass. Within the above range, the protective power of the protective film formed by the scalp protective composition is further improved. If the content of the hydrophobic silica particles is less than 0.1% by mass of the total mass of the scalp protective composition, the protective effect of the scalp is lowered and sufficient protection may not be achieved. If the content of the hydrophobic silica particles exceeds 8.0% by mass of the total mass of the scalp protective composition, the ease of rinsing from the scalp may decrease.

The value of the ratio of the hydrophobic silica particles to the hydrophilic silica particles (hydrophobic silica particles / hydrophilic silica particles) is often 0.0125 to 40, more preferably 0.0125 to 39. It is particularly good to be 0.25 to 39. Within the above range, it becomes easy to wash away from the coloring agent and the like, and the protective power of the scalp protective composition is sufficiently exhibited. If it is less than the above lower limit, the protective effect of the scalp may be reduced. On the other hand, if it exceeds the above upper limit value, the ease of rinsing from the scalp may decrease.

[1-5] Surfactant:
The scalp protective composition of the present invention may contain an anionic surfactant, an amphoteric surfactant, or a nonionic surfactant, and may not contain a cationic surfactant. In this way, the ease of rinsing from the scalp and the protective effect of the scalp are sufficient. That is, when a cationic surfactant is contained, the ease of washing from the scalp tends to decrease, and further, the protective effect of the scalp tends to decrease.

Examples of the anionic surfactant include alkyl ether sulfate, alkyl sulfate, alkenyl ether sulfate, alkenyl sulfate, olefin sulfonate, alkane sulfonate, alkyl or alkenyl ether carboxylate, and α-sulfon fatty acid. Examples thereof include salts, N-acylamino acid-type surfactants, monophosphate or diester-type surfactants, and sulfosuccinic acid esters. Examples of the counterion of the anion group of these surfactants include sodium ion, potassium ion, triethanolamine and the like. Examples of the alkyl ether sulfate include sodium laureth sulfate and sodium lauryl sulfate. Examples of the N-acylamino acid type surfactant include N-lauroyl and sodium L-glutamate. Of these, sodium lauryl sulfate is preferable.

Examples of amphoteric surfactants include amino acid type, betaine type, and natural products. Specifically, alkylamino fatty acid sodium, alkylbetaine, alkylamine oxide, alkyldimethylamine oxide, alkylcarboxybetaine, alkylamine oxide, and lauryl. Betain, stearyl betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl isodazolinium betaine, lauryldimethylamine oxide, lauryldimethylaminoacetic acid betaine, stearyldimethylaminoacetic acid betaine, dodecylaminomethyldimethylsulfopropyl betaine, octadecylamino Methyldimethylsulfopropyl betaine, cocamidopropyl betaine, cocamidopropyl hydroxysultaine, cocamide MEA, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, sodium lauroyl glutamate, potassium lauroyl glutamate, lauroyl methyl- Examples thereof include β-alanine, lauryldimethylamine N-oxide, oleyldimethylamine N-oxide, and lecithin. Among these, betaine-type amphoteric surfactants are preferable, and lauryl betaine is particularly preferable.

Examples of the nonionic surfactant include polyoxyalkylene alkyl ether, polyoxyalkylene alkenyl ether, polyoxyethylene sorbitan fatty acid ester, sucrose fatty acid ester, sorbitan fatty acid ester, alkyl saccharide surfactant, glycerin fatty acid ester, and poly. Examples thereof include oxyethylene hydrogenated castor oil, fatty acid alkanolamide, coconut oil fatty acid ethanolamide, and alkylamine oxide. Examples of the polyoxyalkylene alkyl ether include polyoxyethylene lanolin alcohol (lanes), polyoxyethylene cetyl ether (cetes), polyoxyethylene stearyl ether (steales), polyoxyethylene oleyl ether (oles), and palace. Be done. Among these, polyoxyethylene lanolin alcohol (lanes), particularly lanes-5, polyoxyethylene alkylamine, sorbitan trioleate, and polyoxyethylene lauryl ether are preferable.

As the nonionic surfactant, a nonionic surfactant having an HLB value of 10 or less is preferably used, and an HLB value of 2 to 7 is more preferable. The blending ratio of the nonionic surfactant having an HLB value of 10 or less is not particularly limited, but is preferably 0.3 to 75% by mass, more preferably 0.3 to 50% by mass. It is particularly good that it is 0.3 to 30% by mass.

As the surfactant consisting of an anionic surfactant, an amphoteric surfactant, and a nonionic surfactant, only one type may be used, or two or more types may be used in combination.

[1-6] Other ingredients:
The scalp protection composition of the present invention may further contain other components other than the above components, if necessary.

The scalp protection composition of the present invention may further contain a hydrocarbon other than petrolatum and heavy liquid isoparaffin, and an oily component other than this hydrocarbon, if necessary.

Examples of hydrocarbons other than petrolatum and heavy liquid isoparaffin include saturated or unsaturated hydrocarbons that can be used as a base for scalp protection compositions, and among them, paraffin-based hydrocarbons having 15 or more carbon atoms. Hydrogen is preferred. Specifically, selecin, squalane, squalene, α-olefin oligomer, hydrogenated polydecene, polydecene, dodecane, solid paraffin (paraffin wax), mineral oil (liquid paraffin), hydrogenated polyisobutene (liquid isoparaffin, light liquid isoparaffin; , Excluding heavy liquid isoparaffin), isododecane, pristane, etc.

Examples of oily components other than hydrocarbons include waxes, higher alcohols, higher fatty acids, vegetable fats and oils, animal fats and oils, esters, silicones and the like.

Examples of the silicone contained in the scalp protection composition of the present invention include linear or cyclic silicones such as dimethicone and cyclomethicone, and in particular, dimethicone.

In addition, the composition for protecting the scalp of the present invention, for example, water, polyhydric alcohol, lower fatty acid, lower alcohol, antioxidant, storage stabilizer, fragrance, moisturizer, anti-inflammatory agent, thickening agent, if necessary. It may contain agents, UV absorbers, pH regulators, plant extracts, animal extracts, preservatives, antibacterial agents and the like.

[1-7] Viscosity of scalp protection composition:
The viscosity of the scalp protection composition of the present invention is not particularly limited and can be appropriately set, but can be 300 to 340,000 mPas (cP) at room temperature (24 ° C.). By setting the viscosity within such a range, the scalp can be easily washed away and the scalp protective effect can be sufficiently exhibited. If the viscosity is less than 300 mPas, it is easy to wash off from the scalp, but the protective effect of the scalp tends to decrease. On the other hand, when the viscosity is more than 340,000 mPas, the ease of rinsing from the scalp is lowered, and the protective effect of the scalp tends to be lowered.

[2] How to use the scalp protection composition:
The scalp protective composition of the present invention is used to protect the scalp from a hair treatment agent. That is, it has an effect of preventing dyeing and discoloration of the scalp by the hair treatment agent. Specifically, the scalp protective composition is applied by applying the scalp protective composition on the scalp to form a protective film on the scalp, and then performing hair treatment after the protective film is formed to apply the scalp protective composition. The scalp is prevented from being stained or the like in the portion.

Here, "application" is a concept that includes not only applying the scalp protective composition directly to the scalp but also spraying it onto the head. When the scalp protective composition is applied to the scalp, a protective film is formed on the scalp, but even if the scalp protective composition adheres to the hair, the scalp protective composition does not inhibit the dyeing of the hair.

The scalp protection composition of the present invention can be in the form of a liquid, a semi-solid, or a gel at room temperature.

The scalp protective composition of the present invention is used by applying it on the scalp before treating the hair. If necessary, in addition to the scalp, it may be applied to a portion to which the hair treatment agent may adhere (forehead, border with temples, ears, etc.). Examples of the method of application include a method using a finger, a palm, a brush, a comb, a brush, a roller, a container with a nozzle, a spray, and the like.

Then, after forming a protective film with the scalp protective composition of the present invention, the hair is treated by a conventionally known method using a hair treatment agent. When the hair treatment agent such as a coloring agent is washed off with water or the like after the hair treatment, the scalp protection composition of the present invention wraps the hair treatment agent when exposed to water or the like (specifically, , The scalp protective composition gels while encapsulating the hair treatment agent) and immediately flows off the scalp. For this reason, for example, in hair coloring, an emulsification operation is usually performed, but this emulsification operation can be omitted. In addition, this emulsification work causes the practitioner's fingertips to be colored, the practitioner to dry the skin, and the makeup and sunscreen to fall off. By using the scalp protection composition of the present invention, it is possible to avoid such problems that occur in the practitioner and the practitioner.

When the scalp protection composition of the present invention is used, the emulsification work can be omitted, but it goes without saying that the emulsification work may be performed as needed.

Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to these examples.

[Preparation of scalp protection composition]
(Example 1)
Vaseline (trade name: Snow White Pet-V USP, manufactured by Kaneda), mineral oil (trade name: Hicall K-140N, manufactured by Kaneda), polyoxylanolin alcohol (lanes-5) (trade name: POLYCHOL 5-SO) -(JP), Claude Japan), heavy fluid isoparaffin (trade name: Pearl Ream 18, manufactured by Nichiyu), and hydrophilic silica (trade name: AEROSIL 200, manufactured by Ebonic, specific surface area: 200). , The composition was added and mixed so as to have the blending ratio shown in Table 1 to obtain a composition for protecting the scalp.

(Examples 2 to 110, Comparative Examples 1 to 19)
A scalp protection composition was obtained in the same manner as in Example 1 except that the components and blending ratios shown in Tables 1 to 12 were used for preparation. In Tables 1 to 12, "%" means mass%.

The components used in each Example and Comparative Example are specifically shown below.
・ Hydrophilic silica:
Product name "AEROSIL 200" manufactured by Evonik Industries, Ltd., specific surface area (specific surface area by BET method): 200 m / g, described as "Aerosil 200 hydrophilic silica" in Tables 1 to 12.
・ Nonionic surfactant:
Polyoxylanolin alcohol (trade name "POLYCHOL 5-SO- (JP)", manufactured by Croda Japan, Lanes-5). In Tables 1 to 12, it is referred to as "Lane's-5 nonionic surfactant".
・ Heavy liquid isoparaffin (hydrogenated polyisobutene):
Product name "Pearl Dream 18" manufactured by NOF CORPORATION. In Tables 1 to 12, it is referred to as "Pearl Ream 18 Hydrogenated Polyisobutene (Heavy Liquid Isoparaffin)".
Product name "Pearl Dream 46" manufactured by NOF CORPORATION. In Table 8, it is described as "Pearl Ream 46 Hydrogenated Polyisobutene (Heavy Liquid Isoparaffin)".
・ Anionic:
Emar 0 (Na Lauryl Sulfate, manufactured by Kao Corporation)
・ Cationic:
Cationic 2ABT (distearyldimonium chloride / isopropanol manufactured by NOF CORPORATION)
・ Amphoterism:
Anchor 20BS (manufactured by Lauryl Betaine Kao)
・ Nonionic:
Polychol 5-SO- (JP) (Lane's -5: Polyoxyethylene lanolin alcohol manufactured by Croda Japan)
・ Hydroxypropyl methylcellulose:
Product name Metrose 60SH-50, manufactured by Shin-Etsu Chemical Co., Ltd. Hydrolyzed collagen:
Molecular weight 5000, manufactured by Nitta Gelatin (acryloyldimethyltaurine ammonium / VP) copolymer:
Made by Clariant Japan, Talc:
Particle size 7 μm Specific surface area 7.5 m ² / g Made by Japan Talc Al (OH) ₃ Surface treatment Titanium oxide (hydrophilic):
Particle size 0.01 μm to 0.03 μm Specific surface area 75-85 m ² / g Made by Ishihara Sangyo Co., Ltd. Hexagonal columnar zinc oxide:
Average particle size 0.1 μm, manufactured by Sakai Chemical Industry Co., Ltd. Hydrophobic silica:
Product name: AEROSIL R812, manufactured by Evonik, average particle size (primary particles): 7 nm

Various evaluations were performed using the scalp protection composition obtained above.

[Easy to wash off]
First, 2 g of each of the prepared scalp protective compositions was taken and applied to half of the surface of pig skin to form a protective film. Next, 5g of hair dye (trade name: Wella Colleton Perfect 1 Tone Black, manufactured by Procter & Gamble Japan) and hair dye oxidizer (trade name: Welloxon Perfect, Procter & Gamble Japan) A mixture (referred to as "hair dye mixture") was obtained by mixing with 5 g of (manufactured by the company), which was scooped with a comb brush and applied to the entire surface of the pig skin on which the protective film was formed. After leaving for 15 minutes, the hair dye mixture was washed away. At this time, the hair dye mixture was rinsed with hot water (36 ° C.) together with the scalp protective composition, and the ease of flushing from the pig skin was evaluated. The evaluation criteria are as follows. It should be noted that the longer the time of applying the hot water for rinsing, the better the rinsing becomes possible, but the shorter the time of applying the hot water to the person to be treated is, the better. This is because the person to be treated feels uncomfortable or anxious.

A: When you apply hot water at 36 ° C in the shower, everything flows immediately (in less than 2 seconds).
B: If you apply hot water at 36 ° C in the shower, everything will flow in 2 seconds.
C: If you apply hot water at 36 ° C in the shower for 2 seconds, it will almost flow.
D: If you shower with hot water at 36 ° C for 2 seconds, about half of it will flow, but about half will remain.
E: When hot water of 36 ° C is applied in the shower for 2 seconds, only a part (less than half) flows (emulsification is required).

[Dyeing prevention performance]
After washing off the hair dye mixture by the above [easy to wash off] test, the moisture was wiped off, and the "dyeing prevention performance" was evaluated according to the following evaluation criteria. The evaluation was performed visually, and the evaluation criteria were as follows. In Tables 1 to 12, this evaluation is referred to as "prevention of nail polish dyeing".
A: The surface of pig skin is not dyed at all.
B: The surface of the pig skin is slightly dyed, but 90% or more is not dyed.
C: The surface of pig skin is dyed, but 70% or more is not dyed.
D: The surface of pig skin is dyed, but more than 50% is not dyed.
E: The surface of the pig skin was almost dyed.

[Dripping]
The presence or absence of dripping was confirmed for some of the prepared scalp protection compositions. The presence or absence of this dripping was confirmed as follows. That is, in the same manner as in the above-mentioned "easy to wash off" test, the hair dye mixture is further applied to the entire surface of the pig skin on which the protective film is formed, and then warm air is applied to the applied portion with a hair dryer for 15 minutes. It was confirmed that there was no dripping after the operation. Then, the case where dripping was confirmed was defined as "yes", and the case where no dripping was confirmed was defined as "absent".

[viscosity]
The viscosity of some of the prepared scalp protection compositions was measured. The viscosity was measured at room temperature (24 ° C.) with a TVC-7 type viscometer (manufactured by Toki Sangyo Co., Ltd., rotation speed 20 rpm).

Even with a viscosity of about 300 to 340,000 mPas, sufficient evaluation was obtained for "easiness to wash off" and "dyeing prevention performance".

[Hair dyeing]
Although not shown in Tables 1 to 12, the degree of hair dyeing was also confirmed. As a result, hair dyeing was confirmed in all the examples. That is, it was found that the scalp protective composition of the present invention does not inhibit hair dyeing in the hair dyeing treatment.

The method for evaluating hair dyeing is shown below. First, a hair bundle of gray human hair was prepared, and the scalp protection composition of Examples and Comparative Examples was applied to the lower half of the hair bundle so as to be imprinted. Next, 5g of hair dye (trade name: Wella Colleton Perfect 1 Tone Black, manufactured by Procter & Gamble Japan) and hair dye oxidizer (trade name: Welloxon Perfect, Procter & Gamble Japan) A mixture of 5 g (manufactured by Co., Ltd.) (hair dye mixture) was scooped with a comb brush and applied to the entire hair bundle. After leaving for 15 minutes, the hair dye mixture was rinsed with water. Moisture was wiped off with a paper towel, and the hair bundle was visually observed.

(Discussion)
From the results of Tables 1, 4 and 8, it can be seen that the blending ratio of the hydrophilic silica particles is 0.2 to 8% by mass. If this range is not satisfied, it can be seen that the ease of rinsing from the scalp and the protective effect of the scalp cannot be obtained.

From the results of Tables 2, 4 and 9, it can be seen that the lower limit of the blending ratio of petrolatum is 10% by mass and the upper limit is 99.8% by mass.

From the results in Tables 5 and 7, when an anionic surfactant, an amphoteric surfactant, or a nonionic surfactant is contained and no cationic surfactant is contained, the ease of rinsing from the scalp and the scalp are observed. The protective effect of is sufficient. That is, it was found that the inclusion of the cationic surfactant reduces the ease of rinsing from the scalp and further reduces the protective effect of the scalp.

From the results in Table 6, it can be seen that the blending ratio of the weight-fluidized isoparaffin is 5 to 80% by mass of the total mass.

From the results in Table 10, it can be seen that the blending ratio of the hydrophobic silica particles is 0.1 to 8.0% by mass of the total mass.

Table 11 shows the results of evaluation of "easiness to wash off" and "prevention of nail polish dyeing" for a scalp protection composition containing a compound having hydrophilicity instead of hydrophilic silica particles. As can be seen from Table 12, with the compounds other than the hydrophilic silica particles, sufficient results were not obtained in the evaluation of "easiness to wash off" and "prevention of nail polish dyeing".

From the results in Table 12, if the viscosity of the scalp protection composition is 300 to 340,000 mPas at 24 ° C., the evaluation results of "easy to wash off" and "prevention of nail polish dyeing" are good. On the other hand, if the viscosity of the scalp protection composition is out of the above-mentioned predetermined range, it can be seen that the evaluation results of "easiness to wash off" and "prevention of nail polish dyeing" cannot be sufficiently obtained.

The scalp protective composition of the present invention can be suitably used as a protective agent for protecting the scalp in hair treatment.

Claims (7)

Vaseline, which is 10-99.8% by mass of the total mass, and
Contains hydrophilic silica particles, which is 0.2-8% by mass of the total mass.
A scalp protective composition that is applied to the scalp to form a protective film that protects the scalp on the scalp before the treatment of hair. The scalp protection composition according to claim 1, further comprising a heavy liquid isoparaffin which is 5 to 80% by mass of the total mass. The scalp protection composition according to claim 1 or 2, wherein the viscosity at 24 ° C. is 300 to 340,000 mPas. The scalp protective composition according to any one of claims 1 to 3, which contains an anionic surfactant, an amphoteric surfactant, or a nonionic surfactant and does not contain a cationic surfactant. The scalp protection composition according to any one of claims 1 to 4, further containing hydrophobic silica particles which are 0.1 to 8.0% by mass of the total mass. The composition for protecting the scalp according to any one of claims 1 to 5, wherein the total of the blending ratio of the hydrophilic silica particles and the blending ratio of the hydrophobic silica particles is 0.3 to 8% by mass. Claims 1 to 40, wherein the value of the ratio of the mixing ratio of the hydrophobic silica particles to the mixing ratio of the hydrophilic silica particles (the mixing ratio of the hydrophobic silica particles / the mixing ratio of the hydrophilic silica particles) is 0.0125 to 40. The composition for protecting the scalp according to any one of 6.