JPS5942038B2 - Hair shampoo - composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hair shampoo composition that has significantly reduced irritation to the skin.

Traditionally, Jump's top surfactants, whether used by professionals such as those used in hair salons or commercially available products, are mainly alkyl sulfate salts, polyoxyethylene alkyl sulfate salts, alkylbenzene sulfonates,
α-olefin sulfonate and the like have been widely used.
However, although JUMP products containing these surfactants have excellent cleaning power, they are known to be highly irritating to the skin, albeit to varying degrees, and are not recommended by barbers and beauticians. Professionals who often come into contact with jump equipment are more likely to develop skin problems such as rough hands.

Also, these days, young people who have a particularly developed sense of hygiene wash their hair more often, but even the general public washes their hair less than 3 to 3 times.
The number of hair washes has increased to four times a week or every day, and if you continue to wash your hair with Jump Ichi, which contains a highly irritating surfactant, your scalp will become rough, leading to dandruff and itching. There is a problem.

From these points of view, the current situation is that there is a strong demand for the use of low skin irritation Jump 1, not only for professional use but also for general commercial use.

The present inventors have focused on the above points and have conducted extensive research. As a result, surfactants and surfactant compositions with strong protein denaturing power have been found to cause severe roughness of hands when used repeatedly.
On the other hand, surfactants and surfactant compositions with low protein denaturing power are less likely to cause skin disorders such as rough hands even if used for a long period of time, and they also cause significant dandruff on the scalp. I found that it decreased.

That is, for various surfactants and surfactant compositions, measurement of protein denaturation rate, roughness test using actual human hands,
We measured the amount of dandruff caused by actual use (prolonged use) and found a correlation that surfactants and surfactant compositions with a low protein denaturation rate are less likely to cause rough hands and tend to reduce the amount of dandruff. This led to the completion of one invention.

That is, the present invention provides the following formula: (wherein R1 is an alkyl group or alkenyl group having an average of 7 to 19 carbon atoms, R2 is a lower alkyl group having an average of 1 to 3 carbon atoms, and M is an alkali metal or an organic Represents amines.

) and (B) general formula (wherein R3 is an alkyl group or alkenyl group having an average carbon number of 8 to 20, R4 and R5 are an average carbon Represents a lower alkyl group having 1 to 3 atoms.

), a trialkylaminoacetic acid betaine type amphoteric surfactant represented by (C) general formula (wherein R6 represents an alkyl group or alkenyl group having an average number of carbon atoms of 7 to 19, m and n are integers) , m
+n is 1 to 5.

) as an active ingredient. The preferred blending ratio of the active ingredients is:
) is about 3:1 to about 1:2, and the molecular ratio of
):(C) is in the range of about 15:1 to about 1:1, and B+(B)+(C) accounts for about 10 to about 50 parts by weight of the total.

The present inventors have determined that an alkyl alkyl taurine salt type anionic surfactant represented by the above general formula (B) and a trialkylaminoacetate betaine type amphoteric surfactant represented by the above general formula (B) are mixed in an appropriate molecular ratio. They discovered that when mixed with each other, phenomena such as increased viscosity, increased pH, and decreased critical micelle concentration were observed compared to when each was mixed alone, and a complex of anionic surfactant and amphoteric surfactant was formed. However, in this mixture, the surfactant abilities such as foaming and detergent properties are as good as those of each agent alone, and at the same time, the protein denaturation ability is lower than that of each agent alone. It was discovered that there was a significant decrease in

A suitable molecular ratio of this prisoner:(B) is about 3:1 to about 1
:2, and a molecular ratio as close as possible to 1:1 is desirable.

If the mixing ratio is outside this range or if a large amount of other aninocytic surfactant is added to disrupt the balance of the system, a sufficient effect of lowering protein denaturation performance cannot be obtained.

In addition, the alkylolamide type nonionic surfactant represented by the general formula (O) used in the present invention has been known to have a foaming enhancement effect, a thickening effect, a low temperature effect, and an anionic surfactant type jump. Although it is blended for the purpose of improving stability, etc., in the present invention, this (C) is blended in a certain ratio to the mixture of the above-mentioned drug and (B). It was found that the protein denaturation ability was further reduced.

A preferred ratio of (B):(C) is about 15: by weight.
It ranges from 1 to about 1:1, and from this ratio prisoner + (B
) If the amount is too high, the protein-lowering ability of (C) will not be fully exhibited, and if the amount of (C) is too high, the detergency and foaming power of Jump One will be impaired. Also, prisoner + (B) + (
C) is preferably about 10 to about 50 parts by weight of the total to form a liquid jump. In the present invention 1
An alkylyl alkyl taurine salt type anionic surfactant represented by the general formula is, for example, an alkylyl group RlC
Examples of O- include lauroyl, myristoyl, palmitoyl, stearoyl, oleoyl, and cocoyl groups from oil fatty acids; examples of the alkyl group R2 include methyl, ethyl, and propyl groups; and counterions M include lithium and potassium. , sodium, triethanolamine, diethanolamine, monoethanolamine, and the like.

In the trialkylaminoacetic acid betaine type amphoteric surfactant represented by the general formula (B), for example, the alkyl group R3 is a mixed alkyl group having 8 to 18 carbon atoms obtained from lauryl, myristyl, palmityl, stearyl, oleoyl, and perilla oil. Examples of the alkyl groups R4 and R5 include cases in which one or both of methyl, ethyl, and propyl groups are used in combination. In the alkylolamide type nonionic surfactant represented by the general formula (O), examples of the alkylyl group R6CO- include lauroyl, myristoyl, palmitoyl, stearoyl, oleoyl, and a cocoyl group derived from an oil fatty acid. Jump 1 of the present invention may contain ingredients commonly added to Jump 1 if desired, such as higher alcohols, lanolin derivatives, protein derivatives, oily components such as fatty acid esters of polyethylene glycol, propylene glycol, glycerin, polyethylene glycol, etc. Moisturizing agent ingredients, nonionic surfactants such as polyoxyethylene alkyl ether and polyethylene oxide polypropylene oxide block polymers, water-soluble polymer substances, sequestering agents, preservatives, bactericidal agents,
It can contain a PH adjuster, an ultraviolet absorber, an antioxidant, a pigment, a fragrance, and the like.

Next, the present invention will be explained in detail with reference to examples, but prior to that, the test methods and evaluation methods employed in each example will be explained.

Foaming Test Method A 1% sample concentration solution was prepared for 400 days using CacO37Oppm artificial hard water, and the amount of foaming was measured at a temperature of 40° C. using a cylindrical cylinder equipped with a stirrer.

Cleanability Test Method CaO/MgO=3/15-DH A solution with a sample concentration of 1% was prepared using artificial hard water, and an artificial sebum-stained cloth using wool surge was washed.

Tergotometer (JISK-3) under the condition of temperature 40℃
371), and the cleaning efficiency was determined from the reflectance before and after. Using aqueous high performance liquid chromatography, the denaturation rate of bovine serum albumin was measured using an absorption peak at 220 nm when a sample was added to a bovine serum albumin PH7 buffer solution at a sample concentration of 1%.

Method for measuring dandruff production General commercially available lauryl ether sulfate type Jump 1 (products that do not contain drugs for dandruff and itch)
A panel of people using the sample were asked to wash their hair five times with the same frequency and method as usual, and the amount of dandruff before and after using the sample was compared.

The amount of dandruff on the 3rd day after hair washing with a commercially available Jump 1 and on the 3rd day from the last day after washing hair 5 times with a sample was measured. Dandruff is collected by suction from the head using a suction device with a cloth.
In order to eliminate errors due to other foreign substances, the amount of nitrogen was determined by the gel tar method, and this was multiplied by 6.25 to determine the average protein amount, which was defined as the amount of dandruff (skill/head). The number of panels was 3 for each sample, and the average values were compared. Rough hand test method For each sample, a panel of 10 people (5 men and 5 men) was used, and one hand was placed in an aqueous solution with a sample concentration of 5% and a temperature of 35°C, and the other hand was placed in water at the same temperature for 10 minutes. The soaking operation was performed twice a day for two consecutive days, and the difference in the roughness of the skin between the left and right hands was visually determined.

Example 1 Jump 1 having the formulation shown in Table 1 below was prepared, and its foaming properties, detergency, protein denaturation rate, roughness on hands, and amount of dandruff were examined.

These results are shown in Table 1 (invention examples) and Table 2 (comparative examples).

Claims (1)

[Claims] 1 (A) General formula ▲ Numerical formula, chemical formula, table, etc. ▼ (In the formula, R_1 is an alkyl group or alkenyl group having an average of 7 to 19 carbon atoms, and R_2 is an (3) lower alkyl group, M represents an alkali metal or organic amine. In the formula, R_3 represents an alkyl group or alkenyl group having an average of 8 to 20 carbon atoms, and R_4 and R_5 represent a lower alkyl group having an average of 1 to 3 carbon atoms. (C) General formula ▲ Numerical formula, chemical formula, table, etc.
m+n is 1 to 5. ) as an active ingredient; The amount ratio of the nonionic surfactant is as follows (i) to (
A hypoallergenic hair shampoo composition that satisfies all of iii). (i) Amount of alkyl alkyl taurine salt type anionic surfactant: Amount of trialkylaminoacetic acid betaine type amphoteric surfactant = 3:1
~1:2 (molecular ratio) (ii) Total amount of alkyl alkyl taurine salt type anionic surfactant and trialkylaminoacetic acid betaine type amphoteric surfactant: Amount of alkylolamide type nonionic surfactant = 15 :1 to 1:1 (weight ratio) (iii) Total amount/composition of alkylyl alkyl taurine salt type anionic surfactant, trialkylaminoacetic acid betaine type amphoteric surfactant, and alkylolamide type nonionic surfactant Total amount of things = 10-50% (weight)