JP2010222317A - Oil-in-water type emulsified cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-in-water type emulsified cosmetic as a higher fatty acid soap type emulsion, excellent in use feeling and penetration feeling into skin even without adding a special component for improving the penetration feeling. <P>SOLUTION: This oil-in-water type emulsified cosmetic is characterized by comprising (A) behenic acid, stearic acid and isostearic acid, (B) triethanolamine and (C) 40 to 90 mass% water. The blending amount of the behenic acid, stearic acid and isostearic acid is preferably 0.1 to 3 mass% in total, and the blending amount of the triethanolamine is preferably 0.1 to 2.5 mass%. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a higher fatty acid salt (soap) type oil-in-water emulsified cosmetic that has a quick familiarity with the skin and excellent permeability.

Higher fatty acid salts (soaps) are generally used as emulsifiers in cosmetics and pharmaceuticals because they have a good skin feel and excellent emulsifiability in oils, and various studies have been conducted to improve their properties. I have been.
For example, Patent Document 1 discloses that one or two or more higher fatty acid soaps and lipophilic and hydrophilic nonionic substances are used in preparing an emulsion using a higher fatty acid soap, which is usually basic, as an emulsifier at an acidic pH. It is described that a stable acidic emulsion can be obtained by using a combination of type surfactants.

  Patent Document 2 includes an oil-in-water solution having good emulsifiability, no crystal precipitation, and excellent stability over time by containing three or more sodium salts or potassium salts of fatty acids having 14 to 22 carbon atoms. It is described that a mold emulsion composition is obtained.

  However, in the emulsion compositions described in Patent Documents 1 and 2, an alkali metal such as sodium or potassium is used as a higher fatty acid neutralizer, and a composition using such a higher fatty acid alkali metal salt as an emulsifier. The product had insufficient penetration into the skin.

On the other hand, in order to improve the penetration feeling of the oil-in-water emulsion composition into the skin, a volatile silicone oil component is added (Patent Document 3), or skin penetration comprising oleic acid ester, liquid alcohol, liquid higher fatty acid, etc. Attempts have been made to blend components (Patent Document 4).
However, even when a special component for imparting a penetrating feeling as described above is not blended, it has not been achieved to improve the penetrating feeling of the higher fatty acid soap type oil-in-water emulsion into the skin. It was.

JP 58-24325 A JP 59-139920 A JP 2007-145719 A JP 2007-238488 A

  Therefore, the subject in the present invention is an oil-in-water emulsified cosmetic excellent in feeling of use and skin penetration, regardless of the presence or absence of a special component for improving penetrability in higher fatty acid soap type emulsions. Is to provide.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have selected a combination of three higher fatty acids, behenic acid, stearic acid and isostearic acid as the surfactant, and triethanol as the neutralizing agent. It has been found that an oil-in-water emulsified cosmetic with a penetrating sensation can be obtained by blending an amine, and the present invention has been completed.

That is, the present invention
(A) behenic acid, stearic acid, and isostearic acid,
(B) triethanolamine, and (C) 40-90% by weight of water,
An oil-in-water emulsified cosmetic comprising the following:

  The oil-in-water emulsified cosmetic of the present invention is particularly excellent in usability such as familiarity with the skin and permeation into the skin.

  The cosmetic of the present invention is a higher fatty acid soap type oil-in-water emulsified cosmetic, and contains a combination of three specific higher fatty acids (component A) as higher fatty acids: behenic acid, stearic acid, and isostearic acid. This is the first feature.

  The blending amount of behenic acid, stearic acid and isostearic acid in the cosmetic of the present invention is usually 0.1 to 3% by mass, preferably 0.4 to 2% by mass, more preferably 0. It is 5-1.5 mass%. If the blending amount is less than 0.1% by mass, good emulsification becomes difficult, and even if the blending amount exceeds 3% by mass, no further improvement in characteristics can be obtained.

  In the cosmetic of the present invention, it is necessary to contain all of behenic acid, stearic acid and isostearic acid, but the blending ratio of each fatty acid is not particularly limited. That is, the blending ratio of behenic acid: stearic acid: isostearic acid may be varied within the range of 1 to 98: 1 to 98: 1 to 98, for example, when the total of the three mixtures is 100, preferably 20-50: 20-60: 10-60, More preferably, it can be set to 25-40: 25-50: 20-50.

  The second feature of the cosmetic of the present invention is that a specific neutralizing agent called triethanolamine (component B) is blended. Triethanolamine is used as a neutralizing agent for higher fatty acid soap type emulsions together with alkali metals such as sodium and potassium (see Patent Document 1). The present invention is characterized in that the above three kinds of higher fatty acids such as behenic acid, stearic acid and isostearic acid are combined with triethanolamine.

  The blending amount of triethanolamine in the cosmetic of the present invention is usually 0.1 to 2.5% by mass, preferably 0.1 to 2% by mass, more preferably 0.4 to 1.5% by mass. . If the blending amount is less than 0.1% by mass, it becomes difficult to obtain a good penetration feeling, and even if the blending amount exceeds 2.5% by mass, no further improvement in characteristics can be obtained.

  In the cosmetic of the present invention, it is essential to add triethanolamine, but other neutralizers such as sodium salt and potassium salt may be further added. When mix | blending another neutralizing agent, the molar ratio of the triethanolamine in the whole neutralizing agent shall be 0.25-1, and preferably 0.5-1. When the molar ratio of triethanolamine is less than 0.25, it is difficult to obtain a penetrating feeling.

  The third feature of the cosmetic of the present invention is that it contains water (component C) in an amount of 40 to 90% by mass, preferably 50 to 85% by mass, more preferably 55 to 82% by mass. When the blending amount of water is less than 40% by mass or when the blending exceeds 90% by mass, the effect of the present invention may not be obtained.

  The cosmetics of this invention can mix | blend other components other than said essential component AC in the range which does not inhibit the effect of this invention. Examples of other components include humectants, thickeners, surfactants, oils, chelating agents, preservatives, fragrances, whitening agents, ultraviolet absorbers, and drugs.

  The form of the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and is used as a normal skin cosmetic, for example, a lotion, a milky lotion, a cosmetic liquid, a cream, etc. It can also be used as a form of cosmetics.

  The cosmetic of the present invention can be prepared according to a method conventionally used for preparing an oil-in-water emulsion composition. Briefly, by dissolving a water-soluble component in water to form an aqueous phase, mixing an oil-soluble component to form an oil phase, and adding and emulsifying the oil phase to the aqueous phase while stirring with a homomixer or the like Can be prepared.

The cosmetic of the present invention is particularly suitable for use as a skin cosmetic because it has a feature of excellent permeation to the skin. For example, when it is in the form of a milky lotion or cream containing a moisturizing agent, it is possible to give a feeling that the moisturizing component penetrates into the skin when applied to the skin.
The pH of the cosmetic of the present invention is not particularly limited, but is usually preferably 7.0 or higher.

  Hereinafter, the present invention will be described in more detail with specific examples, but the present invention is not limited to the following examples. Moreover, unless otherwise indicated, the compounding quantity in the following Examples etc. shows the mass%.

(Example 1 and Comparative Example 1)
Oil-in-water emulsion compositions having the compositions listed in Table 1 below were prepared.
About the obtained composition, pH was measured and the penetration feeling at the time of apply | coating to skin was evaluated. These results are also shown in Table 1.
The permeation feeling was evaluated according to the following criteria by a specialized panel (N = 3).
A: Everyone felt that there was a sense of penetration.
○: Two people felt there was a sense of penetration.
Δ: One person felt that there was a sense of penetration.
X: Everyone did not feel the penetration.
As is apparent from Table 1, in Example 1 where only potassium hydroxide was used as the neutralizing agent, no penetrating sensation was felt, but in Example 1 where the neutralizing agent was triethanolamine, significant penetration was observed. A feeling was obtained.

(Examples 2-9)
The composition listed in the following Table 2 was used as the basic composition, and an oil-in-water emulsion composition was prepared in which the amount of triethanolamine to be blended was changed within the range described in Table 3, and the composition obtained was the same as in Example 1. The pH of the product was measured, and the penetration feeling when applied to the skin was evaluated. The results are shown in Table 3.

(Examples 10 to 15)
Prepare an oil-in-water emulsion composition in which the composition listed in Table 4 below (an acidic composition containing 4-methoxysalicylic acid) is used as the basic composition and the amount of triethanolamine to be blended is changed within the range described in Table 5. In the same manner as in Example 1, the pH of the obtained composition was measured, and the permeation feeling when applied to the skin was evaluated. The results are shown in Table 5.

(Examples 16 to 19 and Comparative Example 2)
The composition listed in Table 6 below (an acidic composition containing 4-methoxysalicylic acid) was used as the basic composition, and triethanolamine and / or potassium hydroxide was used as a neutralizing agent to be blended. The oil-in-water emulsion composition changed in the range was prepared, and the pH of the resulting composition was measured in the same manner as in Example 1 to evaluate the permeation feeling when applied to the skin. The results are shown in Table 7.

  From the results of Table 7, if triethanolamine is contained as a neutralizing agent, a penetrating sensation can be obtained even when used in combination with a neutralizing agent such as an alkali metal such as a potassium salt. It was found that the greater the blending ratio of ethanolamine, the better the penetrating sensation.

(Examples 20 to 29 and Comparative Examples 3 to 5)
The composition listed in the following Table 8 is used as a basic composition, and an oil-in-water emulsion composition is prepared by changing the blending amount of fatty acids (behenic acid, isostearic acid, stearic acid) within the range described in Table 9, and Examples In the same manner as in Example 1, the pH of the obtained composition was measured, and the penetration feeling when applied to the skin was evaluated. The results are shown in Table 9.

  From the results of Table 9, in Examples 20 to 29 containing three types of fatty acids, behenic acid, isostearic acid, and stearic acid, excellent penetration feeling can be obtained even when the blending ratio is changed. It can be seen that even a single composition (Comparative Examples 3 to 5) lacks sufficient penetration.

(Formulation example 1) Name of emulsion raw material Compounding amount (% by mass)
Liquid paraffin 7
Vaseline 3
Decamethylcyclopentasiloxane 2
Behenyl alcohol 0.7
Glycerin 5
Dipropylene glycol 7
Polyethylene glycol 1500 2
Jojoba oil 1
Isostearic acid 0.5
Stearic acid 0.5
Behenic acid 0.5
Tetra-2-ethylhexanoic acid pentaerythrit 3
Cetyl 2-ethylhexanoate 3
Glycerol monostearate 1
Polyoxyethylene glyceryl monostearate 1
Triethanolamine 0.05
Stearyl glycyrrhetinate 0.05
L-Arginine 0.1
Royal Jelly Extract 0.1
Yeast extract 0.1
Tocopherol acetate 0.1
Acetylated sodium hyaluronate 0.1
Edetate trisodium 0.05
4-t-butyl 4′-methoxydibenzoylmethane 0.1
2-Ethylhexyl paramethoxycinnamate 0.1
Carboxyvinyl polymer 0.15
Paraben Appropriate amount Purified water Residual perfume Appropriate amount

Production Method Dissolve the carboxyvinyl polymer in a small amount of purified water (phase A). Polyethylene glycol 1500 and triethanolamine are added to the remaining purified water, dissolved by heating and kept at 70 ° C. (aqueous phase). The other ingredients are mixed, dissolved by heating and kept at 70 ° C. (oil phase). Preliminarily emulsify by adding an oil phase to the aqueous phase, add phase A and uniformly emulsify with a homomixer. After emulsification, cool to 30 ° C. with good stirring.

(Formulation example 2) Cream raw material name Amount (mass%)
Liquid paraffin 3
Vaseline 1
Dimethylpolysiloxane 1
Stearyl alcohol 1.8
Behenyl alcohol 1.6
Glycerin 8
Dipropylene glycol 5
Macadamia nut oil 2
Hardened oil 3
Squalane 6
Behenic acid 0.6
Stearic acid 0.6
Isostearic acid 0.8
Cholesteryl hydroxystearate 0.5
Cetyl 2-ethylhexanoate 4
Polyoxyethylene hydrogenated castor oil 0.5
Self-emulsifying glyceryl monostearate 3
Triethanolamine 0.4
Sodium hexametaphosphate 0.05
Trimethylglycine 2
α-tocopherol 2-l-ascorbic acid diester potassium salt 1
Tocopherol acetate 0.1
Green tea extract 0.1
Paraben appropriate amount trisodium edetate 0.05
4-t-butyl 4′-methoxydibenzoylmethane 0.05
Diparamethoxycinnamate mono-2-ethylhexanoate glyceryl 0.05
Colorant Appropriate amount Carboxyvinyl polymer 0.05
Purified water residue

Production method Dipropylene glycol is added to purified water, dissolved by heating and kept at 70 ° C (aqueous phase). The other ingredients are mixed, dissolved by heating and kept at 70 ° C. (oil phase). The oil phase is added to the aqueous phase, preliminarily emulsified, and uniformly emulsified with a homomixer, and then cooled to 30 ° C. with good stirring.

(Formulation example 3) Daytime cream ingredient name Formulation amount (% by mass)
Methylphenylpolysiloxane 5
Stearyl alcohol 2
Glycerin 5
Dipropylene glycol 5
Sorbit liquid (70%) 5
Behenic acid 0.75
Stearic acid 0.9
Isostearic acid 0.85
Tetra-2-ethylhexanoic acid pentaerythrit 4
Self-emulsifying glyceryl monostearate 1
Triethanolamine 0.5
Octyl methoxycinnamate 6
Vaseline 2
Tranexamic acid 2
1,3-butylene glycol 4
Squalane 3
Sodium citrate 0.1
Acetylated sodium hyaluronate 0.1
Xanthan gum 0.2
Bentonite 1
Paraben Appropriate amount Purified water Residual perfume Appropriate amount

Production method Dipropylene glycol is added to purified water, dissolved by heating and kept at 70 ° C (aqueous phase). The other ingredients are mixed, dissolved by heating and kept at 70 ° C. (oil phase). The oil phase is added to the aqueous phase, preliminarily emulsified, and uniformly emulsified with a homomixer, and then cooled to 30 ° C. with good stirring.

Claims (5)

(A) behenic acid, stearic acid, and isostearic acid,
(B) triethanolamine, and (C) 40-90% by weight of water,
Containing an oil-in-water emulsion cosmetic. The cosmetic according to claim 1, wherein the total amount of behenic acid, stearic acid and isostearic acid is 0.1 to 3% by mass. The cosmetic composition according to claim 1 or 2, wherein the amount of triethanolamine is 0.1 to 2.5 mass%. The neutralizing agent other than triethanolamine is further contained, and the molar ratio of triethanolamine in the whole neutralizing agent is 0.25 to 1, characterized by the above-mentioned. Cosmetics. The cosmetic according to any one of claims 1 to 4, wherein the cosmetic is in the form of an emulsion or cream.