JPS5857478B2 - 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 the hair, has good foaming power, and cleansing power, and has excellent storage stability. It is something.

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 diisopropanolamide. The object of the present invention is to provide a liquid shampoo composition that does not irritate the skin, has good detergency and foaming power, has a bactericidal effect, an anti-dandruff effect, softens hair, and has excellent storage stability. .

Further objects and advantages will become apparent from the description below.

That is, the present invention provides a quaternary ammonium salt represented by (in the above formula, R is an alkyl group or alkenyl group having 6 to 17 carbon atoms, and R' is a benzyl group) in a 0.1 to 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, and 10% of higher fatty acid potassium salt.
40% by weight, 1 to 10% by weight of higher fatty acid diisopropanolamide, 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 may be used singly or in combination of two or more.

Its content is o, i to 2.0% by weight based on the weight of the composition,
Preferably it is 0.2 to 1.0% by weight.

If it is less than 0.1% by weight, it will not have the effect of softening the hair, and the foaming power and bactericidal effect will tend to decrease, and if it is more than 20% by weight, the irritation will become stronger.

Also, the bubble power is reduced.

Particularly preferred among the quaternary ammonium salts represented by the above general formula are lauryldimethylbenzylammonium chloride, octyldimethylbenzylammonium 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.

If the amount exceeds 20% by weight, the higher fatty acid potassium salt tends to be salted out and the hair softening effect tends to decrease.

The higher fatty acid potassium salt is a potassium salt of a saturated or unsaturated fatty acid having 10 to 118 carbon atoms,
Preferably potassium caprate, potassium laurate,
Examples include potassium laurate, potassium myristate, potassium palmitate, potassium stearate, potassium oleate, potassium coconut fatty acid, etc., and one or more of them may be used as a mixture (also a mixture).

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 tends to aggregate into a gel-like state, resulting in poor storage stability.

Higher fatty acid diisopropanolamide has 8 carbon atoms.
Diisoproptoolamides of ~18 saturated or unsaturated fatty acids, such as caprylic acid diisopropaturamide, capric acid diisopropaturamide, lauric acid diisopropaturamide, myristic acid diisopropaturamide, undecylene Examples include acid diisopanolamide, palmitic acid diisobalanolamide, stearic acid diisopropanolamide, oleic acid jetanolamide, and coconut fatty acid diisopropanolamide.

These higher fatty acid diisopropanolamides can be used alone or in combination of two or more.

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

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.

When it is less than 45% by weight, stability tends to decrease at low temperatures such as in winter, and when 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 perfumes, colorants, preservatives, etc.

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 diisopropanolamide, and a quaternary ammonium salt of the general formula 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 maintains appropriate viscosity without forming precipitates or becoming opaque even after 2 years of storage.

However, as shown in the comparative example below, even if common salt is present, the quaternary ammonium salt of the above general formula in which the chlorine atom is replaced with a bromine atom, which is not according to the present invention, quickly reacts with the fatty acid potassium salt. to form a precipitate.

As described above, 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 higher fatty acid diisopropanolamide is extremely unique.

Furthermore, one of the features of the present invention is that the detergency and foaming power of the higher fatty acid potassium salt 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 percent by weight.

(2) Production of liquid shampoo composition Adding salt, lauryl dimethylpendelammonium chloride, and coconut fatty acid diisopropanolamide to water;
A mixed solution (4) was prepared by dissolving.

Then, (4) was added to the coconut fatty acid potassium salt while stirring.
A perfume 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.

(2) Comparative Example 3 was carried out in the same manner as in the present invention except that only coconut fatty acid diisopropanolamide 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, we will examine the storage stability, viscosity, appearance, and sensory tests of the compositions of the invention examples and comparative examples (mild cleansing properties, hair flexibility, foaming properties, cleansing properties, bactericidal properties, dandruff prevention)
I researched about it.

The results are shown in Table 1.

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

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 This is a centipoise (cps) value measured at 30°C using a Pruxfield rotational viscometer type B.

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 stearyltrimethylammonium 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 7 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.

Example 3 ** The same procedure as in Example 1 of the present invention was carried out 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 10f at 40℃ using Ross Miles foaming power tester
Using a solution diluted with water to 100 OP, the volume of foam after 10 seconds is measured using a function.

○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 at 20° C. and 65% RH for 24 hours, and then the coefficient was measured by the Leder method at 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 5×2.5n piece is taken out, and a glass cylinder (height: about 1.5CrrL) with an inner diameter of 2CIrL is placed and held there.

0.1 in 0.075 molar phosphate buffer (pH 7,9)
%TritonX-100 (AIKYI pheno
xy polYoxyethylene ethers
：Rohm and Hoas)
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 the tester. This operation 2
Let's go around.

Dilute the 21'Ll test solution at an appropriate ratio.

1 ml of this diluted solution is stained with 0.05 TLl of 2% crystal violet staining solution, placed in a white blood cell slide glass, and the number of corneocytes is measured.

The number of cells is expressed per 1 d of scalp. The higher the number of keratinocytes, the greater the amount of dandruff, and in Examples, the lower the number of keratinocytes, the better the dandruff prevention effect.

○Animal eye viscosity irritation test 0.1Vl! The sample is instilled into one eye, and the other eye serves as a control.

1.2.3.4.7 After treatment, observe the whites of the eyes and continue if the problem persists.

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 (a) Degree of cloudiness Score: Clear O The details of the iris can be seen through the opaque area.

1. The details of the iris are slightly unclear through the opaque area. 2. The details of the iris cannot be seen through the opaque area, but the pupil can be identified.

3 Neither the iris nor the pupil can be distinguished.

4(b) Area of cloudiness
Score 1/4 or less
11/4~1/2 21/2~3
/4 33/4 or more
4(a)X(b)X 5
Maximum 80 points Judgment standard score 0-0.5 Non-irritating 0.5-2.5 is mostly non-irritating 25-15
Very mild irritation 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 corneocytes 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 coconut fatty acid potassium salt 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 diisopropazuramide 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 diisopronolamide is 1 to 10%, preferably 2 to 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
A product was prepared in the same manner as in Example 1, except that trityl benzene sulfonate was replaced with stearyl dimethyl benzyl ammonium chloride and lauryl dimethyl benzyl ammonium chloride.

Comparative Example 10 was prepared in the same manner as in Example 1 of the present invention, except that sodium sulfate (mirabilite) was used instead of common salt in the composition of Comparative Example 9.

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 diisopropanolamide used in the present invention, and mirabilite is used in place of common salt, the present invention can still be achieved. Therefore, it is not possible to obtain an excellent shampoo composition.

Claims (1)

[Scope of Claims] 1 A quaternary ammonium salt represented by the following general formula (in the above formula, R is an alkyl group or alkenyl group having 6 to 17 carbon atoms, and K is a benzyl group. , i~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, higher fatty acid diimpropaturamide 1
A liquid shampoo composition characterized in that it contains ~10% by weight and 45-89% by weight of water.