JPS5857479B2 - 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 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 is an improvement over the above-mentioned runner-up by combining the above-mentioned specific quaternary ammonium salt, common salt, higher fatty acid potassium salt, and higher fatty acid monoisopropanolamide, and achieves the above-mentioned objective. What we do is provide a liquid shampoo composition that does not irritate the skin, has good detergency and foaming power, has bactericidal and anti-dandruff effects, softens hair, and has excellent storage stability. It's about doing.

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

That is, the present invention provides 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.

) of the quaternary ammonium salt represented by 0.1 to 2.0
Weight% (weight% is based on the weight of the composition, hereinafter the same large salt
．． 1-2.0% by weight, 10-4% higher fatty acid potassium salt
0% by weight, 1% higher fatty acid monoisopropanolamide
It is a liquid shampoo composition characterized by containing ~10% by weight and 45-89% 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 0.1 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 o, i% by weight, it will not have the effect of softening the hair, and the foaming power and bactericidal power will tend to decrease.
When the amount exceeds % by weight, the irritation becomes strong.

The foaming power also decreases.

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 2.0% by weight, the higher fatty acid potassium salt tends to be salted out, and the hair softening effect also tends to decrease.

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.

If the amount exceeds 2.0% by weight, the higher fatty acid potassium salt tends to be salted out, resulting in poor conditions.

The content of fatty acid potassium salt is 1% based on the weight of the composition.
0 to 40% by weight, preferably 15 to 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.

Examples of higher fatty acid monoisopropanolamides include monoisopropanolamides of saturated or unsaturated fatty acids having 8 to 18 carbon atoms, such as caprylic acid monoisopropanolamide, capric acid monoisopropanolamide, and lauric acid monoisopropanazine. Paturamide, myristic monoisopropaturamide, palmitic acid monoisopropaturamide, stearic acid monoisopropaturamide, oleic acid monoisopropaturamide, coconut fatty acid monoisopropaturamide, and the like can be mentioned.

These higher fatty acid monoisopropanolamides can be used alone or in combination (or a mixture) of two or more.

The amount (content) of higher fatty acid monoisopropanolamide 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 water content 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 exceeds 89% by weight, stability tends to decrease at 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 monoisopropanolamide, 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 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. Forms 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 monoisopropanol amide 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 % by weight.

Example 1 (1) Composition of liquid shampoo of the present invention 16 Coconut fatty acid potassium salt 25 parts 2 Coconut fatty acid monoisopropazylamide 4 parts 3 Lauryldimethylbenzylammonium 1 part Chloride (pure content) (2) Liquid shampoo composition Preparation of Composition A mixed solution (A) was prepared by adding and dissolving common salt, lauryldimethylbenzylammonium chloride, and coconut fatty acid monoisopropanolamide in water.

Thereafter, (A) 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.

■ Comparative example 2 is lauryldimethylbenzyl bitterness.
The same procedure as in the present invention was carried out except that only 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 monoisopropazuramide 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 of the compositions of the present invention and comparative examples,
Appearance and sensory tests (mild cleansing properties, hair flexibility, foaming properties, bactericidal properties, and anti-dandruff properties) were investigated.

The results are shown in Table 1.

In addition, the storage stability in Table 1 is 2 weeks at 10°C and 45°C.
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 (OPS) 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 stearyldimethylammonium chloride was used instead of lauryldimethylbenzylammonium chloride.

In Comparative Example 5, lauryltrimethylammonium bromide was used instead of lauryldimethylbenzylammonium chloride, and as Comparative Example 6, lauryltrimethylammonium chloride was used instead of lauryldimethylbenzylammonium chloride, and coconut fatty acid monoisopropylene The same procedure as in Example 1 of the present invention was carried out except that Paturamide 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 10g sample at 40℃ using Ross Miles foaming power tester
Using a solution diluted with 1,00 μl of water, the height of the bubbles after 10 seconds is measured in terms of numbers.

○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 at 20°, 065% RH, and then the coefficient was measured by the radar method at a friction speed of 2 m/min and a load of 500 cm.

○Number of horny cells: Pinch the hair that has been washed with each sample and use an electric razor for about 2.
Cut 5X2.5crrL and put an inner diameter of 2cm there.

A glass cylinder (height approximately 1.5 CrIl) is placed and held.

0.1% in 0.075 molar phosphate buffer (PH7,9)
Tri ton X-100 (Alkyl phenol
xy polyoxyethylene ethers
: 1r of solution containing Rohm and Hoas Co.
Place the rtl 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.

27711 test solution is diluted at an appropriate ratio.

0.0 of 2% crystal violet staining solution per 1ml of this diluted solution! The cells are stained with MLl and placed in a white blood cell slide glass to measure the number of corneocytes.

The number of cells is scalp IC/? Expressed in number per L.

The higher the number of keratinocytes, the greater the amount of dandruff, and in the Examples, the lower the number of keratinocytes, the better the effect of preventing dandruff.

○Animal ocular mucosal irritation test Instill 0 or 1 ml of the sample into one eye, and use the other eye as a control.

Observe on days 1, 2, 3, 4, and 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.

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 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 content of coconut fatty acid monoisopropaturamide was
The same procedure as in Example 1 of the present invention was carried out except for the changes shown in the table.

The results are shown in Table 6.

As is clear from this result, the content of coconut fatty acid monoisopropaturamide is 1 to 10%, 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 of the present invention, except that tridecyl benzene sulfonate was replaced and lauryldimethylbenzyl ammonium chloride was replaced with stearyl dimethyl benzyl ammonium chloride.

Comparative Example 10 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.

The results are shown in Table 7. As is clear from this result, even if higher sodium alkylbenzenesulfonate is used in place of the higher fatty acid monoisopropanolamide used in the present invention, and even if mirabilite is used in place of common salt, the present invention can 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 R' is a benzyl 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
A liquid shampoo composition characterized in that it contains 40% by weight, 1 to 10% by weight of higher fatty acid monoisopropazuramide, and 45 to 89% by weight of water.