JPH0717490B2 - Hair cosmetics - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hair cosmetic composition that keeps the scalp healthy and effectively suppresses dandruff and itch.

[Prior Art] Conventionally, hair cosmetics for the purpose of preventing dandruff and itch have mainly been blended with a bactericide, and examples thereof include zinc pyrithione, trichlorocarbanilide, and piroctone ola. Min, sulfur, etc. are known.

[Problems to be Solved by the Invention] However, many of these fungicides have a problem with safety on the scalp, and there are also problems with respect to price and odor, and their use is significantly limited. Met.

[Means for Solving Problems] The present inventors have focused their attention on the above problems, and as a result of earnest studies on dandruff and itch suppressants that can be easily incorporated into products,
Hydroxyapatite powder has excellent safety for the scalp, is easy to use in terms of odor and price, and is mixed into hair cosmetics. Furthermore, a predetermined amount of acid is mixed therein to adjust the pH of hair cosmetics to 2 to 7. It was discovered that the effect of controlling the scalp to be superior to the scalp and the effect of suppressing dandruff and itch can be achieved by adjusting the amount to be adjusted to 1.

Although the mechanism by which hydroxyapatite powder effectively suppresses dandruff and itch is not clear, hydroxyapatite powder stimulates the scalp and stops the cycle of keratinization (turnover), which is a causative agent that easily causes dandruff. It is considered to have the property of specifically adsorbing free fatty acids and lipid peroxides, which is considered to be the cause of suppressing dandruff and itch.

That is, the present invention provides a hair cosmetic composition containing 0.0001 to 10% by weight of hydroxyapatite powder, 0.01 to 10% by weight of an acid, and pH 2 to 7 with respect to the total amount of the hair cosmetic composition. Is.

Hereinafter, the configuration of the present invention will be described in detail.

In the present invention, hydroxyapatite compounded in hair cosmetics is a mineral name, and its chemical formula is Ca ₁₀ (PO ₄ ) ₆
It is represented by (OH) ₂ and is also known as an inorganic component constituting the vertebrate skeleton. Most naturally occurring apatite minerals are fluorapatite Ca ₁₀ (PO ₄ ) ₆ F ₂ . Usually, hydroxyipatite powder is synthesized by a wet method or a dry method.

As an example of the synthesis by the wet method, calcium hydroxide and phosphoric acid are reacted in an aqueous solution at a temperature of room temperature to 60 ° C. to obtain hydroxyapatite powder. On the other hand, as an example of the synthesis by the dry method, calcium carbonate and calcium phosphate are mixed in air or in a water vapor atmosphere, for example, 900
Hydroxyapatite powder is obtained by solid state reaction at a high temperature of ~ 1200 ° C. When a particulate hydroxyapatite powder is required, the wet method is preferred.

The average particle size of the hydroxyapatite powder used in the present invention is preferably 0.01 to 100 μm, more preferably 1
It is 0 μm or less.

The amount of hydroxyapatite powder used in the present invention is 0.0001 to 10% by weight, preferably 0.01 to 5% by weight, based on the total amount of the hair cosmetic composition.

The hair cosmetic composition of the present invention is adjusted to pH 2 to 7. As a result, a more excellent effect of suppressing dandruff and itch is exhibited.

If the compounding amount of the hydroxyapatite powder is less than 0.0001% by weight, the effect of suppressing dandruff and itch cannot be expected, and if it exceeds 10% by weight, usability may be impaired, which is not preferable. If the pH of the hair cosmetic composition is less than 2, the safety to the scalp may be deteriorated, and the pH of the hair cosmetic composition may be 7 or less.
If it exceeds, the tendency to suppress the dandruff and itching tend to be weakened.

In the present invention, an acid is added to adjust the pH to 2-7.
In the present invention, as the acid, lauric acid, myristic acid, palmitic acid, stearic acid, aliphatic monocarboxylic acids such as oleic acid, oxalic acid, malonic acid, aliphatic dicarboxylic acids such as succinic acid, carbocyclic ring such as benzoic acid Heterocyclic carboxylic acids such as carboxylic acids and pyrrolidonecarboxylic acids,
Hydroxy acids such as lactic acid, malic acid, tartaric acid and citric acid, or amino acids are added. The compounding amount is generally 0.01 to 10% by weight in the lower part total.

Hair cosmetics according to the present invention include shampoo, hair rinse, hair treatment, hair mousse, hair cream, hair lotion and the like.

In addition to the above components, the hair cosmetic composition according to the present invention, depending on the type of hair cosmetic composition, comprises esters of fatty acids with lower alcohols and polyhydric alcohols, paraffin hydrocarbons,
Fatty acids, linear or branched higher alcohols, oils such as alkyl glycerin ether, silicone oil, and polyoxyethylene alkyl ether acetates, higher fatty acid salts, N-acyl amino acid salts, alkyl sulfates, alkylaryl sulfates, α Anionic surfactants such as olefin sulfonate, acyl isethionate, alkyl sulfosuccinate, N-acyl methyl taurine salt, polyoxyethylene alkyl ether sulfate, alkyl phosphate, polyoxyethylene alkyl ether phosphate , And polyoxyethylene alkyl ethers, esters of fatty acids with lower alcohols and higher alcohols or their ethylene oxide adducts, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene alkyls Phenyl ether, polyoxyethylene alkylamine, fatty acid alkanolamides, fatty acid and a polyhydric ethylene oxide adduct of an alcohol of the ester and a nonionic surfactant of the hydrogenated product or the like,
And amphoteric surfactants such as carboxybetaine, sulfobetaine and imidazoline derivatives, and cationic surfactants such as monoalkyltrimethylammonium chloride, dialkyldimethylammonium chloride and monoalkenyltrimethylammonium chloride, and polyvalent Moisturizer such as alcohol, lower alcohol, anionic,
Cationic and nonionic water-soluble polymers, vitamins and other drugs, zinc pyrithione, trichlorocarbanilide, piroctone olamine, sulfur and other germicides, preservatives, UV absorbers, antioxidants, metal ion sealing Agents, fragrances, pigments,
Insoluble fine powders of nylon, polyethylene, cellulose, chitin, inorganic compounds and the like can be appropriately blended within a range that does not impair the purpose and effects of the present invention.

EXAMPLES Next, the present invention will be described in detail with examples.

Prior to the examples, the test method and evaluation method adopted in each example will be described.

Method for measuring dandruff suppression effect Normally, a sample using a lauryl ether sulfate-based general commercially available shampoo (which does not contain a drug for dandruff itch) is used with the same hair washing frequency and the same hair washing method as usual. They were used to wash their hair 5 times, and the amount of dandruff before and after using the sample was compared. The amount of dandruff on the 3rd day after washing the hair with a general commercial shampoo and the amount of dandruff on the 3rd day from the final day of washing the sample 5 times were measured.

The dandruff is collected by suction from the head with a suction device with a filter cloth, nitrogen is quantified by the Kjeldahl method in order to remove errors due to other foreign substances, and this is multiplied by 6.25 to obtain the average protein mass, and the amount of dandruff (mg / Head). The number of panels was 3 for each sample, and the average values were compared.

◎ …… The amount of dandruff decreased by 35% or more after using the sample ○ …… The amount of dandruff decreased by 30% or more and less than 35% after using the sample △ …… The amount of dandruff after using the sample was 10% or more and 30% Less than x × ... After use of the sample, the amount of dandruff decreased from 0% to less than 10% or the amount of dandruff increased Comparative Examples 1 to 9 A shampoo having the composition shown in Table 1 was prepared. ,
The antidandruff effect was examined by the above method.

As shown in Table 1, none of the comparative examples exhibited a significant anti-dandruff effect, and particularly Comparative Examples 1 to 3 exhibited almost no anti-dandruff effect.

Comparative Example 10, Examples 1 to 5 A hair rinse having the composition shown in Table 2 was prepared,
The antidandruff effect was investigated.

The test was carried out using the above hair rinse after washing the hair with a shampoo containing no antidandruff agent, and the antidandruff effect was examined by the same method as in the shampoo of the example. As shown in Table 2, this example showed an excellent dandruff suppressing effect.

Example 6 A hair lotion having the following composition was prepared.

95% Ethyl alcohol 50.0 Dimethylpolysiloxane 2.0 Liquid paraffin 2.0 Stearyltrimethylammonium chloride 0.5 1,3-Butylene glycol 5.0 Citric acid 0.1 Hydroxyapatite 0.5 Fragrance 0.2 Water Residue This hair lotion had a pH of 4 and showed excellent dandruff suppression effect. .

[Effects of the Invention] The hair cosmetic composition of the present invention is a hair cosmetic composition having an excellent effect of keeping the scalp healthy and suppressing dandruff and itch.

Claims (1)

[Claims] 1. A hair cosmetic composition comprising 0.001 to 10% by weight of hydroxyapatite powder, 0.01 to 10% by weight of an acid, and pH 2 to 7 with respect to the total amount of the hair cosmetic composition.