JPS5857477B2 - Liquid shampoo composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid shampoo composition that provides a bactericidal effect without irritating the skin, softens hair, has excellent foaming power, and has excellent storage stability. .

Higher alcohol sulfate ester salt, which is an anion activator,
Liquid shampoos in which a quaternary ammonium salt is dissolved in an aqueous solution of a sulfate salt of a higher alcohol polyglycol ester or a sulfate salt of an alkyl or allyl polyglycol ether are already known.

However, these products are not necessarily satisfactory in terms of detergency and foaming.

In addition, when fatty acid salts are used as anionic activators to increase detergency and improve lathering, precipitation occurs when left for a long period of time, reducing the detergency and foaming of soap and the hair softening effect and sterilization of quaternary ammonium salts. This is not preferable because it will be ineffective.

The present invention improves all of the above-mentioned drawbacks by combining the above-mentioned specific quaternary ammonium salt, common salt, higher fatty acid potassium salt, and higher fatty acid jetanolamide, and aims to: To provide a liquid shampoo composition that does not irritate the skin, has excellent detergency, provides a sterilizing effect, softens hair, has excellent foaming power, and has excellent storage stability.

That is, the present invention has the following formula: (In the above formula, R is an alkyl group or alkenyl group having 6 to 17 carbon atoms, and R' is a benzyl group or a methyl group.

) and 0.1 to 2.0% by weight of quaternary ammonium salt (weight% is based on the weight of the composition, hereinafter the same), and 0% of common salt.
．． 1-2.0% by weight, 10-4% higher fatty acid potassium salt
0% by weight, 1 to 10% by weight of higher fatty acid jetanolamide, and 45 to 89% by weight of water.

The specific quaternary ammonium salts used in the present invention are represented by the above general formula, and are used singly or in combination of two or more.

Its content is 0.1 to 2.0% by weight based on the weight of the composition.
, preferably 0.2 to 1.0% by weight.

When it is less than 0.1% by weight, it has no effect of softening the hair and tends to lose its bactericidal effect, and when it is more than 2.0% by weight, it becomes highly irritating.

The foaming power also decreases. Among the quaternary ammonium salts represented by the above general formula, particularly preferred are lauryldimethylbenzylammonium chloride, octyldimethylbenzylammonium chloride, lauryltrimethylammonium chloride, and the like.

The content of common salt is 0.1 to 2.0% by weight, preferably 0.2 to 1.0% by weight based on the weight of the composition.

If the amount is less than 0.1% by weight, the quaternary ammonium salt will precipitate and will not have the effect of softening hair and the bactericidal power will decrease.

When the amount exceeds 20% by weight, the higher fatty acid potassium salt tends to be easily salted out.

The higher fatty acid potassium salt is a potassium salt of a saturated or unsaturated fatty acid having 10 to 18 carbon atoms, preferably potassium caprate, potassium laurate, potassium laurate, potassium myristate, potassium valmitate, and stearic acid. Potassium, potassium oleate, potassium coconut fatty acid, etc. can be mentioned, and one kind or a mixture of two or more thereof (also a mixture) can be used.

The amount used (content) is 10-4% based on the weight of the composition.
0% by weight, preferably 15-35% by weight.

When the amount is less than 10% by weight, foaming becomes poor and detergency also decreases.

When the amount exceeds 40% by weight, the liquid state cannot be maintained and it becomes a gel-like mass, resulting in poor storage stability.

Higher fatty acid jetanolamide has 8 to 1 carbon atoms.
8 saturated or unsaturated fatty acid jetanolamide, such as caprylic acid jetanolamide, capric acid jetanolamide, lauric acid jetanolamide,
Examples include myristic acid jetanolamide, undecylenic acid jetanolamide, palmitic acid jetanolamide, stearic acid jetanolamide, oleic acid jetanolamide, and coconut fatty acid jetanolamide.

These higher fatty acid jetanolamides are one or two types.
It is possible to use a mixture of two or more species (or a mixture).

The amount (content) of higher fatty acid jetanolamide used is 1 to 10% by weight, preferably 2 to 8% by weight, based on the weight of the composition.

When it is less than 1% by weight, the viscosity decreases, stability deteriorates, and foaming power also decreases.

Further, the content of water is 45 to 89% by weight, preferably 50 to 80% by weight, based on the weight of the composition.

If it is less than 45% by weight, stability tends to decrease at low temperatures such as in winter, and if it is more than 89% by weight,
Stability tends to decrease under high temperatures such as in summer.

Incidentally, the composition of the present invention may contain additives commonly required for shampoos, such as fragrances, colorants, preservatives, and the like.

The liquid shampoo composition of the present invention is produced by dissolving a higher fatty acid potassium salt in a mixed aqueous solution prepared by dissolving common salt, higher fatty acid jetanolamide, and the quaternary ammonium salt in water.

The liquid shampoo composition of the present invention is a transparent viscous liquid, and the coexisting salt also acts as a stabilizer.
It has excellent long-term storage stability and does not form precipitates or become opaque even after being stored for 2 years, and maintains appropriate viscosity.

However, as shown in the comparative examples described below, even when common salt is present, a quaternary ammonium salt of the general formula other than the present invention, in which the chlorine atom is replaced with a bromine atom, quickly reacts with the fatty acid potassium salt. Produces a precipitate.

Thus, and as will be described later, the effect of the coexistence of common salt, the quaternary ammonium salt having the above-mentioned specific structure, and fatty acid jetanolamide is extremely unique.

Another feature of the present invention is that the detergency and foaming power of fatty acid potassium salts are promoted and the two together impart viscosity.

The present invention will be explained in detail below.

Note that "part" means part by weight, and "%" means % by weight.

(2) Preparation of liquid shampoo composition Salt, lauryldimethylbenzylammonium chloride, and coconut fatty acid jetanolamide were added and dissolved in water to prepare a mixed solution (4).

Thereafter, (4) was added to the coconut fatty acid potassium salt under stirring, and a fragrance was added and mixed to obtain a liquid shampoo composition of the present invention.

(3) Comparative Example Liquid Shampoo Composition ■ Comparative Example 1 was carried out in the same manner as in the present invention except that lauryl dimethyl benzyl bromide was used instead of lauryl dimethyl benzyl chloride.

(2) Comparative Example 2 was carried out in the same manner as in the present invention except that lauryldimethylbenzyl chloride was not used.

*Comparative Example 3 was carried out in the same manner as in the present invention except that only coconut fatty acid jetanolamide was not used.

(2) Comparative Example 4 was carried out in the same manner as in the present invention except that no salt was used.

(4) Next, the storage stability, viscosity, appearance, and sensory tests (cleansing properties, mildness, hair flexibility, foaming properties, and bactericidal properties) of the compositions of the present invention examples and comparative examples were investigated. .

The results are shown in Table 1.

In addition, the storage stability in Table 1 is 2 weeks at -10℃ and 45℃.
If it was stored in a constant temperature room for 6 months on a 2-week cycle, it was considered stable if it was transparent, and unstable if it was opaque.

The sensory test was conducted with a panel of 20 women, and the number is the number of people who answered that the product was good.

○Viscosity measurement using a Pruxfield rotational viscometer type B at 30°C
This is the centipoise (CPS) value measured in .

As is clear from the results, the liquid shampoo composition of the present invention is significantly superior in transparency, storage stability, viscosity, and sensory properties compared to the composition of the comparative example.

Even if similar components are used in place of the constituent components of the present invention, a good liquid shampoo composition cannot be obtained.

Example 2 A liquid shampoo composition of the present invention was prepared in the same manner as in Example 1, except that lauryltrimethylammonium chloride was used instead of lauryldimethylbenzylammonium chloride.

Comparative Example 5 was carried out in the same manner as in Example 1 of the present invention except that lauryltrimethylammonium bromide was used instead of lauryldimethylbenzylammonium chloride.

Comparative Example 6 was carried out in the same manner as in Example 1 of the present invention except that lauryltrimethylammonium chloride was used instead of lauryldimethylbenzylammonium chloride and coconut fatty acid jetanolamide was not used.

The results are shown in Table 2.

As described above, even if other related quaternary ammonium salts are mixed in place of the quaternary ammonium salt represented by the general formula of the present invention, a good liquid shampoo composition cannot be obtained.

The same procedure as in Example 1 of the present invention was conducted except that the content of lauryldimethylbenzylammonium chloride was changed as shown in Table 3.

The results are shown in Table 3.

As is clear from this result, the content of the specific quaternary ammonium salt is 0.1 to 2.0%, preferably 0.1% to 2.0%.
It is 2 to 1.0%.

○Foaming power test Sample 10i at 40℃ using Ross Miles foaming power tester
Using a solution diluted with water to 100 OP, measure the volume of foam after 10 seconds.

○Hair Dynamic Friction Coefficient Using a 0.1% aqueous solution of each sample, soak the hair in this for 3 minutes, then wash under running water and dry.

This hair was left for 24 hours under the condition of 20'065% RH, and then the coefficient was measured by the Leder method under the conditions of a friction speed of 2 m/min and a load of 500 η.

○Number of horny cells: Pinch the hair that has been washed with each sample and use an electric razor for about 2.
A 5x2.5m mow was cut and a glass cylinder (height: about 1.5CrrL) with an inner diameter of 2C1'n was placed and held there.

0.1% in 0.075 molar phosphate buffer (pH 7,9)
Tr 1tonX-100 (A 1kyl phen
oxy polyoxyethylene ether
s: Rohm and Hoas) solution 177
I71! into a glass cylinder.

Gently rub the scalp inside the glass cylinder with a Teflon rod for 1 minute.

Collect the liquid containing the corneocytes into a test tube. This operation 2
Let's go around.

The 2TLl test solution is diluted at an appropriate ratio.

For this diluted solution ITL1, 2% crystal violet staining solution 0.0577+7! ! The cells are stained with white blood cells and placed in a Karato slide glass to measure the number of corneocytes.

The number of cells is expressed per 1 d of scalp. ○Animal eye mucosal irritation test A sample of 0.1 TrLl is instilled into one eye, and the other eye is used as a control.

Observe on days 1.2.3.4.7 after treatment and continue if failure continues.

The degree of eye damage is multiplied by a factor depending on the magnitude of the effect on visual impairment.

The judgment criteria are as follows. (1) Cornea Example 4 Example 1 except that the salt content was changed as shown in Table 4.
This was carried out in the same manner as in the present invention.

The results are shown in Table 4.

As is clear from this result, the salt content is 0.1%.
When the amount is less than that, the quaternary ammonium salt precipitates and softens the hair, that is, the coefficient of dynamic friction of the hair increases, and the number of keratinocytes increases.

If the amount exceeds 2.0%, the higher fatty acid potassium salt will be salted out, and the viscosity will increase significantly and become gel-like, which is not preferable.

Comparative Example 7 The same procedure as in Example 1 of the present invention was carried out except that the potassium salt of coconut oil fatty acid in Example 1 was replaced with sodium lauryl sulfate.

The results are shown in Table 5. As is clear from these results, when the fatty acid potassium salt was replaced with sodium lauryl sulfate, the foaming power decreased, and many people answered that the detergency (performance) was unfavorable in the sensory test.

Example 5 The same procedure as in Example 1 of the present invention was carried out except that the content of coconut fatty acid jetanolamide was changed as shown in Table 6.

The results are shown in Table 6. As is clear from this result, the content of coconut fatty acid jetanolamide is 1 to 1.
0%, preferably 2-8%.

Comparative Examples 8 to 10 As Comparative Example 8, a shampoo composition was prepared in the same manner as in Example 1 of the present invention, except that the coconut fatty acid potassium salt of Example 1 was replaced with sodium tridecyl benzene sulfonate.

In addition, as Comparative Example 9, coconut fatty acid potassium salt was
It was prepared in the same manner as in Example 1, except that tridecyl benzene sulfonate was replaced with stearyl dimethyl benzyl ammonium chloride and lauryl dimethyl benzyl ammonium chloride was replaced.

Further, as Comparative Example 10, a sample was prepared in the same manner as in Example 1 of the present invention except that the common salt in the composition of Comparative Example 9 was replaced with sodium sulfate (mirabilite).

The results are shown in Table 7. As is clear from these results, even if higher sodium alkylbenzenesulfonate is used in place of the higher fatty acid jetanolamide used in the present invention, and Glauber's salt is used in place of common salt, the superiority of the present invention can be achieved. It is not possible to obtain the same shampoo composition.

Claims (1)

[Scope of Claims] 1. A quaternary ammonium salt represented by the general formula (in the above formula, R is an alkyl group or alkenyl group having 6 to 17 carbon atoms, and R' is a benzyl group or a methyl group). 0.1~2.0
% by weight (weight % is based on the weight of the composition, the same applies hereinafter), 0.1 to 2.0% by weight of common salt, 10 to 2.0% by weight of higher fatty acid potassium salt
40% by weight, 1 to 10 higher fatty acid jetanolamide
A liquid shampoo composition characterized by containing 45 to 89% by weight of water.