JPS63198611A - Hair cosmetic - Google Patents

Abstract

PURPOSE:To obtain a hair cosmetic for preventing dandruff, easily applicable owing to its high water-solubility, producible at a low cost and safe to the scalp even by continuous application, by using a carboxylic acid metal salt and/or an oxycarboxylic acid metal salt as active components. CONSTITUTION:The objective cosmetic contains 0.005-1wt.% carboxylic acid metal salt (e.g. metal salt such as Na, K, Li, Zn, Mg salt, etc., of acetic acid, oxalic acid, malonic acid, pimelic acid, etc.) and/or oxycarboxylic acid metal salt (e.g. metal salt such as Na, K, Li, Zn, Mg salt, etc., of lactic acid, malic acid, etc.). In contrast with conventional cosmetic containing fungicide, the cosmetic can be safely applied to the scalp over a long period. Furthermore, it can be easily used as a cosmetic because of its water-solubility unlike conventional vitamin E esters. It can be used widely as hair tonic, milky lotion for scalp, hair shampoo, hair rinse, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a hair cosmetic, and more particularly to an anti-dandruff hair cosmetic containing a carboxylic acid metal salt and/or an oxycarboxylic acid metal salt.

[Prior Art] Generally, dandruff consists of secretions from sebaceous glands, secretions from sweat glands, peelings from the epidermal layer, etc., and is usually caused by increased secretion of sebaceous glands, etc., but when the skin is infected with bacteria or yeast, dandruff is It is said that the occurrence of misfortune is pathologically promoted. For this reason, hair cosmetics containing antibacterial agents have traditionally been used to prevent dandruff.

However, some disinfectants and antibacterial agents have safety issues for the human body due to their skin irritation, and cosmetics containing antibacterial agents and bactericides can be used daily to eliminate indigenous bacteria on the skin. It has been pointed out that this sometimes causes undesirable situations from an ecological perspective, such as disrupting the delicate balance. For example, zinc pyrithione (ZPT), which has traditionally been recognized as the most effective anti-dandruff drug, is also included in the category of antibacterial agents, and it is preferable to avoid using large amounts of this as much as possible. It is believed that.

Therefore, there has been a widespread desire to prevent the occurrence of dandruff without using such antibacterial agents or bactericidal agents. The search for safe substances has been carried out.

Until now, substances that have anti-dandruff effects that are not based on antibacterial or bactericidal properties include alpha-tocopherol and vitamin A.
acid ester (Japanese Unexamined Patent Publication No. 51-73137) and vitamin E nicotinic acid ester (German Patent No. 230158)
No. 5 and Specification No. 2301660) have been reported.

[Problems to be Solved by the Invention] However, these esters of vitamin E (ie, tocopherol) lack stability on the skin, and cannot be expected to have a sustained effect in suppressing dandruff. In addition, early vitamin E
Since these esters are insoluble in water, they have the disadvantage of forming oily precipitates depending on the dosage form. Also,
In order to add the required amount of the former material, a large amount of surfactant is required, and the former material also has the disadvantage of being expensive.

As a result of investigating the anti-dandruff effects of a wide variety of substances in order to solve these conventional drawbacks, the present inventor found that carboxylic acid metal salts and/or oxycarboxylic acid/metal salts are useful for preventing dandruff. The present invention has been completed.

[Means for Solving the Problems] That is, the present invention provides a hair cosmetic, in particular a hair cosmetic for preventing dandruff, which is characterized by containing a metal carboxylic acid salt and/or a metal oxycarboxylic acid salt. It is something.

Examples of the "carboxylic acid metal salts" that can be used in the present invention include metal acetates, metal oxalates, metal malonates, metal succinates, metal salts of maleates, metal fumarates, and metal glutarates. Examples of the "metal oxycarboxylic acid salts" that can be used in the present invention include metal salts of levulinic acid, metal salts of pimeline, metal salts of adipic acid, metal salts of suberic acid, and metal salts of sebacic acid. , lactic acid metal salts, phosphoric acid metal salts, citrate metal salts, tartrate metal salts, and the like. Furthermore, "metal salts" that can be used in the present invention include sodium, potassium, lithium, zinc, magnesium, and the like.

In the present invention, one or more of the above carboxylic acid metal salts and oxycarboxylic acid metal salts are selected and used.

The amount of carboxylic acid metal salt and/or oxymetal salt is 0.01% by weight based on 1 weight of the total hair cosmetic composition.
The content is preferably 0.005% by weight or more. The upper limit of the amount to be blended varies depending on the form of the hair cosmetic and cannot be limited as it can be blended arbitrarily, but generally it is 1% by weight.
That's about it.

The carboxylic acid metal salt and/or the oxycarboxylic acid metal salt can be dissolved in water or oil as is or by dissolving it in water or an aqueous alcohol solution.

The hair cosmetics of the present invention include conventional ingredients, such as oily ingredients (e.g., squalane, petrolatum, lanolin), ultraviolet absorbers, preservatives, humectants (e.g., glycerin), surfactants (e.g., coconut oil fatty acid monoethanolamide). , coconut oil fatty acid monoethanolamine), fragrance, water, alcohol (e.g. ethyl alcohol, cetyl alcohol)
Thickeners, coloring agents, drugs (vitamins, ZPT, TCC), etc. can be added.

The hair cosmetics of the present invention broadly refer to those used for the scalp, and include, for example, hair tonics, scalp emulsions, hair shampoos, hair rinses, and the like.

Although the mechanism by which the hair cosmetic according to the present invention exerts its effective anti-dandruff effect is not clear, it does not only moderate the metabolic reactions within the scalp tissue, but also reduce lipid peroxides on the scalp, which are the cause of dandruff. This is thought to be because the carboxylic acid metal salt and/or the oxycarboxylic acid metal salt inhibits the formation of .

[Examples] Hereinafter, the present invention will be explained in more detail with reference to Examples.
This is not intended to limit the technical scope of the invention.

Example 1 This example illustrates the anti-dandruff action of sodium citrate according to the invention.

A sample hair tonic was prepared by sequentially adding 0.58 g of sodium citrate, 25.53 g of purified water, a small amount of Yellow No. 1, and a small amount of perfume to 75 g of ethanol. Furthermore, a similar hair tonic was prepared, the only difference being that it did not contain sodium citrate.

On the other hand, lauryl sulfate triethanolamine 18
A shampoo was prepared consisting of 1% by weight carboxyvinyl polymer, 5% by weight glycerin, 1% by weight zinc pyrithione (ZPT), 10% by weight urea, and purified water to a total of 100% by weight. Furthermore, a similar shampoo was prepared that differed from this shampoo in that it did not contain zinc pyrithione.

The subjects for the study were 14 men between the ages of 22 and 45, who had a relatively high number of shortcomings. As a control period, all 14 test subjects were first washed with ZPT-free shampoo and styled with sodium citrate-free hair tonic. Twice a week for one month (
(8 times in total) and the amount of protein in the collected dandruff was measured.

Subsequently, the 14 test subjects were divided into two groups (two groups of seven people each). The 7 people in the first group had their hair washed with a ZPT-free shampoo and styled with a hair tonic containing sodium citrate, and the 7 people in the second group had their hair washed with a ZPT-free shampoo and styled with a hair tonic containing sodium citrate. I did it. In each group, hair washing,
Procedure to collect dandruff accumulated during 2 days of hair styling: Perform twice a week for 1 month (8 times in total) to collect the proteins in dandruff. The head was suctioned using suction, pulling and suction at the tip of the head. The reduction rate of dandruff during the sample period was determined and the results are shown in Table 1.

From the above results, hair tonics containing sodium citrate are recognized to have superior dandruff-preventing effects and improve the scalp when compared to shampoos containing ZPT, which has traditionally been known as an anti-dandruff drug. Ta.

(Margin below) Table 1 Example 2 The anti-dandruff effect was examined by varying the amount of sodium citrate. Six types of hair tonic samples shown in the composition column of Table 2 were prepared. As a test subject, 22-4
The test was conducted by randomly selecting 30 8-year-old males and assigning 5 to each sample. The hair tonic was to be used once a day, and the average amount of protein in the hair accumulated over two days after washing in the control period (using hair tonic without sodium citrate) and the sample period (using hair tonic containing sodium citrate) were calculated. The average protein content of dandruff accumulated over two days after hair washing was compared.

When the reduction rate of dandruff was 10% or more, it was judged that there was a dandruff suppressing effect, and when the reduction rate of dandruff was less than 10%, it was judged that there was no dandruff suppressing effect. The results are shown in Table 2.

(Margin below) Table 2 In the case of the hair tonic containing 0.0005% by weight of sodium citrate (trial 1Nnl), the dandruff suppressing effect was only observed in 3 of the 5 test subjects, elderly and middle school subjects. In the case of the hair tonic containing 0.005% by weight of sodium citrate (Sample No. 4), the dandruff suppressing effect was measured in all five test subjects.

Example 3 2 g of polyoxyethylene (8 mol) oleyl alcohol ether and appropriate amounts of fragrance were added to 55 g of ethyl alcohol and dissolved at room temperature to obtain an alcohol layer. Separately, 5 g of glycerin and 0.05 g of sodium L-phosphate were added to 37.5 g of purified water and dissolved by heating. After cooling, an appropriate amount of pigment was added, and an alcohol layer was added to the aqueous layer to solubilize it to obtain a hair tonic with an anti-dandruff effect.

Example 4 To 79.5 g of purified water, 15 g of lauryl sulfate triethanolamine, 5 g of coconut oil fatty acid monoethanolamide,
0.01 g of sodium succinate, appropriate amounts of Red No. 222 and fragrance were added, heated and mixed, and then cooled to obtain a hair shampoo with an anti-dandruff effect.

Example 5 Polyoxyethylene glycol 1.5003, 5
g and 1 g of triethanolamine to 74.3 g of purified water,
2.5 g of stearic acid, 1.5 g of cetyl alcohol, 5 g of petrolatum, 10 g of squalane and polyoxyethylene (
10 mol) monooleic acid ester (2 g) and an appropriate amount of perfume were heated to obtain an oil phase.

Separately, 0.2 g of potassium tartrate 5 g of propylene glycol
, 1 g of triethanolamine and 73.495 g of purified water
was heated to 80° C., and the above-mentioned oil phase was gradually added to the aqueous phase while promoting sales. After emulsification, the mixture was cooled to obtain a scalp emulsion with an anti-dandruff effect.

[Effects of the Invention] The hair cosmetic of the present invention is safe even when used on the human head for a long period of time, unlike conventional antibacterial or bactericidal cosmetics. Furthermore, unlike conventional vitamin E esters, it is water-soluble, so it can be easily used as a cosmetic. Moreover, it is also cheaper than the above-mentioned esters. Furthermore, it has excellent safety on the skin.

Claims (4)

[Claims] (1) A hair cosmetic containing a carboxylic acid metal salt and/or an oxycarboxylic acid metal salt. (2) The metal carboxylate is metal acetate, metal oxalate, metal malonate, metal succinate, metal maleate, metal fumarate, metal glutarate, metal levulinic acid, pimelic acid. The hair cosmetic according to claim 1, which is one or more selected from the group consisting of metal salts, adipate metal salts, suberate metal salts, azelaic acid metal salts, and sebacic acid metal salts. (3) The oxycarboxylic acid metal salt is one or more selected from the group consisting of lactic acid metal salt, malic acid metal salt, citrate metal salt, and tartrate metal salt. Hair cosmetics. (4) The hair cosmetic according to any one of claims 1 to 3, wherein the metal salt is one or more selected from the group consisting of sodium, potassium, lithium, zinc, and magnesium. .