JP2007332046A - Hair shampoo - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hair shampoo which little gives a sense of skin irritation and can impart a sufficient sense of refreshment over a long time. <P>SOLUTION: This hair shampoo is characterized by comprising a surfactant as a base agent, and a cold-sensing agent comprising (a) menthol, (b) camphor and (c) a fatty acid isopropyl ester, and having a pH value of 3.0 to 6.0. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hair shampoo (hair washing agent) that has little irritation and excellent coolness.

A large number of hair shampoos that contain a cooling sensation agent such as menthol that gives a refreshing and cool feeling during and after shampooing are commercially available. In order to improve the sustainability of such cool feeling, a hair cleansing composition has been proposed in which several kinds of cool sensation substances are blended in combination, or a cool sensation substance and a warm sensation substance are used in combination to provide a sensual sustaining effect. (For example, refer to Patent Document 1). Furthermore, the device which uses a menthol or camphor and a skin penetrant together is also proposed (refer patent document 2).
JP 2005-8535 A JP 2004-269368 A

However, with the improved technology so far, the cooling sensation still cannot be maintained sufficiently, and there is a demand for a hair shampoo that maintains the cooling sensation for a longer time. On the other hand, there is a demand for products with less irritation in consideration of the effect on the scalp.
An object of the present invention is to provide a hair shampoo that maintains a cool feeling for a long time after shampooing and has little irritation.

  As a result of diligent research to solve the problems in the prior art, the present inventors have used menthol and camphor together as a cooling agent component, further blended with fatty acid isopropyl, and the pH value of the hair shampoo is within a specific range. In some cases, the present inventors have found that the cool feeling lasts for a long time and that the feeling of irritation is small, and thus the present invention has been completed.

  That is, the present invention includes a cooling sensation agent composition comprising (a) menthol, (b) camphor and (c) fatty acid isopropyl together with a base surfactant, and has a pH value of 3.0 to 6. A hair shampoo characterized by being 0.0.

  The hair shampoo is characterized in that the pH value is adjusted to 3.0 to 6.0 by adding an acid, and the acid is selected from citric acid, malic acid, succinic acid and phosphoric acid. Or one or more acids.

  Moreover, in the said hair shampoo, 0.1-20 mass parts of component (b) and 10-200 mass parts of component (c) are mix | blended with respect to 100 mass parts of cooling sensation agents composition (a). The component (c) is one or two types of fatty acid isopropyl selected from isopropyl palmitate and isopropyl myristate.

  Furthermore, the cooling sensation agent composition is mix | blended so that content of the component (a) in the said hair shampoo may be 0.6-1 mass%.

According to the present invention, it is possible to provide a hair shampoo that can impart a sufficient cool feeling over a long period of time and has less skin irritation.

The present invention will be described in detail below.
(1) Cooling Sensitive Composition A menthol and a camphor of the component (b) are used in combination as the cooling sensitive component (a) constituting the cooling sensitive composition.

  Menthol, Mentone, Pregole, Isopulegol, Cineol, Peppermint oil, Peppermint oil, Sparemint oil, Eucalyptus oil, etc. have a cooling effect, although they have different effects due to their chemical structures. In the present invention, menthol excellent in cooling effect and its sustainability is used.

  The amount of camphor of component (b) blended with menthol to further enhance the refreshing feeling is 0.1 to 20 parts by mass, more preferably 100 parts by mass of component (a) such as menthol. Is 2 to 10 parts by mass.

Component (c) is a fatty acid isopropyl having 12 to 20 carbon atoms, and specific examples include isopropyl palmitate and isopropyl myristate. These can be used alone or in combination to improve the skin permeability of sensation agents such as menthol, and to provide a cool feeling with less irritating effect efficiently in a small amount without using a large amount of menthol etc. Used. The compounding quantity of a component (c) is 10-200 mass parts with respect to 100 mass parts of components (a), such as menthol, More preferably, it is 50-170 mass parts.
Further, in the hair shampoo, the cooling sensation agent composition is preferably blended so that the menthol of the component (a) is 0.6 to 1% by mass.

(2) Surfactant The surfactant used as the base for the hair shampoo of the present invention is an anionic surfactant, an amphoteric surfactant, or a nonionic surfactant.

  Anionic surfactants include sodium lauryl sulfate, triethanolamine lauryl sulfate, polyoxyethylene (3) sodium lauryl ether sulfate, polyoxyethylene (2) sodium lauryl ether sulfate, polyoxyethylene (3) lauryl ether sulfate tri Examples include ethanolamine.

  Examples of amphoteric surfactants include coconut oil fatty acid amidopropyl betaine, lauryldimethylaminoacetic acid betaine, stearyldimethylaminoacetic acid betaine, lauryldimethylamine oxide, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, etc. Is mentioned.

  Nonionic surfactants include coconut oil fatty acid monoethanolamide, glyceryl monostearate, glyceryl monocaprylate, glyceryl monooleate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan monolaurate, monolaurate Sorbitan palmitate, sorbitan tristearate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, polyoxytrioleate Examples include ethylene sorbitan.

(3) Hair shampoo The hair shampoo of the present invention contains, in addition to the essential components of the surfactant and the cooling sensation agent composition, other components used in a normal hair shampoo within a range not impairing the effects of the present invention. Can be added. For example, cationization of powder components, liquid fats and oils, solid fats and oils, hydrocarbons, higher fatty acids, higher alcohols, esters, silicones, humectants, O- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose chloride, etc. Polymers, water-soluble polymers, salts such as sodium chloride, UV absorbers, sequestering agents, sugars, amino acids, organic amines, polymer emulsions, skin nutrients, vitamins, antioxidants, antioxidant aids, fragrances, Water, organic acid salt, preservatives.
The hair shampoo of the present invention can be produced by a conventional method by appropriately blending them as necessary.

  In order to enhance the persistence of cool feeling, the pH value of the hair shampoo is in the range of 3.0 to 6.0, and the preferable pH value is 5.0 to 6.0, particularly preferably 5.4 to 5.8. is there. This is because the permeability of a cooling sensation agent such as menthol to the skin can be improved by adjusting the pH value of the product in contact with the scalp to an acidic range.

  The pH value of the hair shampoo is determined according to the pH measurement method listed in the Japanese Pharmacopoeia. In actual measurement, a predetermined amount of hair shampoo is placed in a glass beaker, and a glass electrode is immersed therein to measure. The measurement is performed while standing until the numerical value is stabilized or while stirring the shampoo substrate as necessary (so as not to apply an external shock to the glass electrode).

As mentioned above, it is preferable to add an acid in order to adjust the hair shampoo product to the acidic range.
Examples of the acid include citric acid, malic acid, succinic acid, phosphoric acid and the like, and these may be used alone or in combination.
The blending amount of the acid is a hair shampoo blended with the cooling sensation agent composition, that is, an amount such that the pH value of the product after production is in the above acidic range, but the approximate blending amount is the above component (a ) Although it is adjusted in the range of 1 to 200 parts by mass with respect to 100 parts by mass, it is preferable to adjust appropriately so that the pH value of the hair shampoo is in the above acidic range.

EXAMPLES Next, although an Example is shown and this invention is demonstrated further more concretely, this invention is not limited to these Examples.
<Preparation of cooling agent composition (A)>
A cooling sensation agent composition (A) was obtained by blending 4.0 parts by mass of camphor and 170 parts by mass of isopropyl palmitate with respect to 100 parts by mass of menthol.

<Preparation of cooling agent composition (B)>
0.5 parts by mass of camphor and 20 parts by mass of isopropyl palmitate were added to 100 parts by mass of menthol to obtain a cooling sensation agent composition (B).

<Example 1>
A hair shampoo (1) having a formulation shown in Table 1 was prepared using the cooling sensation agent composition (A).

  The hair shampoo was prepared by adding the ingredients (excluding citric acid and a part of purified water) in the formulation components to a 2000 mL glass beaker, and finally the hair shampoo pH value was 5.5 and the final total amount was 1500 parts by mass. Then, citric acid and the remaining purified water were added to adjust. In addition, the measurement of pH value was performed using "HORIBA pH METER F-22" by Horiba.

  In the same manner as in the case of the hair shampoo (1) except that malic acid is used instead of citric acid in Table 1 and malic acid is added so that the pH of the hair shampoo is 5.5. Prepared.

  Use hair shampoo (3) in the same manner as hair shampoo (1) except that succinic acid is used instead of citric acid in Table 1 and succinic acid is added so that the pH of the hair shampoo is 5.8. Prepared.

  Use hair shampoo (4) in the same way as hair shampoo (1) except that phosphoric acid is used instead of citric acid in Table 1 and phosphoric acid is added so that the pH of the hair shampoo is 5.4. Prepared.

<Example 2>
A hair shampoo (5) having a formulation shown in Table 2 was prepared using the cooling sensation agent composition (B).
In the same manner as in Example 1, the pH value was adjusted to 5.5 with citric acid.

<Comparative Example 1>
A hair shampoo (6) was prepared in the same manner as in Example 1 except that the pH value was not adjusted with citric acid. Its pH value was 6.2.

<Comparative example 2>
Instead of 2.74 parts by mass of the cooling agent composition (A) of Example 1, 1 part by mass of menthol was blended to obtain a hair shampoo (7) whose pH value was not adjusted with citric acid. It was 6.1 when pH value was measured on the same conditions.

<Comparative Example 3>
1 mass part of menthol was mix | blended instead of 2.74 mass parts of cooling sensation agent composition (A) of Example 1, and hair shampoo (8) was obtained. The pH value was adjusted with the amount of citric acid so as to be 5.5, the same as in Example 1.

  About the intensity | strength of the cool feeling of the hair shampoos (1)-(5) of the said Examples 1 and 2, and the hair shampoos (6)-(8) of Comparative Examples 1-3, and the irritation | stimulation at the time of use, it is the following Sensory evaluation was performed by the method described above, and the effect of cooling sensation was examined.

<Testing method of coolness>
Sensory evaluation was performed using a general panel (n = 9) according to the following procedure.
(1) Soak both hands in hot water at 40 ° C for 30 seconds.
(2) Drip 200 μL of hair shampoo on the back of the hand with a micropipette, spread it over the back of the hand, and keep it as it is for 1 minute.
(3) Rinse for 30 seconds without rubbing with hot water.
(4) Immediately after washing, the coolness intensity after 5 minutes, 10 minutes, and 30 minutes is evaluated.
(5) Get comments on overall feeling of stimulation at the end of each evaluation.

The evaluation criteria of cool feeling are as follows. The results (average score of evaluation) are shown in Table 3.
3 points: Cool feeling is strong 2 points: Cool feeling is moderate 1 point: Cool feeling is weak 0 point: Cool feeling is not felt at all

<Cooling sensation effect>
Hair Shampoo (1) ≒ Hair Shampoo (4)> Hair Shampoo (2)> Hair Shampoo (3)> Hair Shampoo (5)> Hair Shampoo (6)> Hair Shampoo (8)> Hair Shampoo (7) The cool feeling effect and its sustainability were good results.

<Evaluation of stimulation>
Hair shampoos (6) and (7) felt irritation, and hair shampoos (1) to (5) and (8) resulted in less irritation than hair shampoos (6) and (7).

Claims (6)

  A cooling agent composition comprising (a) menthol, (b) camphor and (c) fatty acid isopropyl, together with a base surfactant, and having a pH value of 3.0 to 6.0. Characteristic hair shampoo.   The hair shampoo according to claim 1, wherein the pH value is adjusted to 3.0 to 6.0 by adding an acid.   The hair shampoo according to claim 2, wherein the acid is one or more acids selected from citric acid, malic acid, succinic acid and phosphoric acid.   The cooling sensation agent composition comprises 0.1 to 20 parts by mass of component (b) and 10 to 200 parts by mass of component (c) with respect to 100 parts by mass of component (a). The hair shampoo according to any one of claims 1 to 3, wherein:   The hair shampoo according to any one of claims 1 to 3, wherein the component (c) is one or two fatty acid isopropyls selected from isopropyl palmitate and isopropyl myristate.   The hair shampoo according to claim 4, wherein the cooling sensation agent composition is blended so that the content of the component (a) in the hair shampoo is 0.6 to 1% by mass.