JP2016013979A - Oil-in-water emulsion composition for creamy cosmetics, and cosmetics - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-in-water emulsion composition for creamy cosmetics, and cosmetics which do not substantially contain synthetic surfactant, are hard to take off from the water, are excellent in stability, and also have an excellent feeling of use, such as compatibility.SOLUTION: The invention relates to an oil-in-water emulsion composition for creamy cosmetics which contains water, an oil component, fatty acid, and alkali salt of fatty acid, and has a viscosity of 2,000 to 90,000 mPa s. In the entire emulsion composition, a synthetic surfactant is not contained substantially, behenic acid, stearic acid, and palmitic acid are contained as fatty acids. The total content of the alkali salt of fatty acid and the fatty acid is 3 to 15 wt.%, the weight ratio of the behenic acid/stearic acid/palmitic acid in the fatty acid is 13 to 68/17 to 57/15 to 50, and the weight ratio of the behenic acid alkali salt/stearic acid alkali salt/palmitic acid alkali salt in the alkali salt of fatty acid is 13 to 68/17 to 57/15 to 50.

Description

  The present invention relates to an oil-in-water emulsion composition for creamy cosmetics, and cosmetics.

  The emulsified composition is obtained by mixing an oily component and a water-soluble component and uniformly emulsifying it. In cosmetic applications, it is mainly used for skin care products such as creams and emulsions. These skin care products are intended to effectively supplement moisture and oil, but of course are required to realize an excellent feeling of use. On the other hand, water may separate over time after production, and the occurrence of such water separation is feared to adversely affect the quality of the emulsified composition. For this reason, the emulsified composition is required to have stability over time with emulsification (hereinafter referred to as emulsion stability), and it is essential to include a so-called amphiphilic substance as an emulsifier in the composition. In general, emulsification stability is improved by using a synthetic surfactant that is highly effective as an emulsifier and can be produced at low cost.

  On the other hand, some synthetic surfactants are likely to induce a stimulating reaction on the skin and indicate the cause of rough skin. For this reason, especially in the emulsified composition for cosmetics often used for the skin, there are not a few consumers who seek a product having excellent emulsification stability and usability without containing a synthetic surfactant.

As a technique for producing an emulsified composition for cosmetics without containing a synthetic surfactant, there is a method of containing a higher alcohol as described in Patent Documents 1 and 2, for example. Thus, it is possible to improve the emulsification stability by producing a cosmetic emulsified composition containing a higher alcohol.
In addition, using both a cosmetic oil component that is liquid at normal temperature and a cosmetic oil component that is solid at normal temperature, these oil components are heated with an aqueous alkali neutralized salt solution (aqueous gel) of carboxyvinyl polymer. It has also been proposed to produce an emulsified composition for cosmetics without containing a synthetic surfactant by stirring at high speed under conditions (see Patent Document 3).
Furthermore, it has also been proposed to produce an emulsified composition for cosmetics by containing a water-soluble polymer such as carrageenan without containing a synthetic surfactant (see Patent Document 4).

JP-A-6-271421 JP 7-267814 A JP 2004-224722 A JP-A-8-245363 JP 59-139920 A

However, since it is necessary to contain a relatively large amount of a higher alcohol in order to stabilize an emulsion composition with a higher alcohol, depending on the composition, there may be a decrease in the feeling of use such as a film feeling or powderiness. is there. For this reason, it is more preferable if stability of an emulsion composition can be improved, without using a higher alcohol.
In addition, in the method in which the cosmetic oil component that is liquid at normal temperature and the cosmetic oil component that is solid at normal temperature are stirred at high speed with an aqueous gel under heating conditions, the aqueous gel needs to be adjusted. It becomes complicated. In addition, when the emulsion composition contains a large amount of aqueous gel, there is a problem that it is difficult to adjust the feeling of use.
In addition, when water-soluble polymers are used, the viscosity and altitude of the emulsion change over time, which may cause storage problems, and it is difficult to dissolve both the aqueous phase and the oil phase. Since it tends to occur, a process such as pre-dissolution in a polyhydric alcohol such as glycerin or application of mechanical force such as a homogenizer is required, which causes a problem that the process becomes complicated.

  Therefore, the present inventors have intensively studied and incorporated behenic acid, stearic acid, palmitic acid, and alkali salts of these three types of fatty acids as fatty acid and fatty acid alkali salts in the emulsion composition, thereby producing a synthetic interface. The present invention was completed by successfully realizing excellent emulsion stability without using an activator.

  Here, in Patent Document 5, a total of three or more fatty acids containing at least one linear saturated fatty acid such as behenic acid, stearic acid, and palmitic acid and at least one fatty acid that is liquid at room temperature are converted into salts. A technique of using an oil-in-water emulsion containing 0.5 to 5 wt% in total for cosmetics such as emulsions, creams and foundations is described. However, in this technique, there are problems with rough skin and feeling of use due to the use of a synthetic surfactant or a large amount of higher alcohol.

  The present invention has been made in view of the above circumstances, and does not substantially contain a synthetic surfactant, and on top of that, it is difficult to release water, has excellent stability, and has excellent usability such as ease of adaptation. The object is to provide an oil-in-water emulsified composition for creamy cosmetics and a cosmetic.

  In order to achieve this object, the oil-in-water emulsion composition for creamy cosmetics of the present invention contains water, an oil component, a fatty acid, and an alkali salt of the fatty acid, and has a viscosity of 2,000 to 90,000 mPa · s. An oil-in-water emulsified composition for creamy cosmetics, comprising substantially no synthetic surfactant in the entire oil-in-water emulsified composition for creamy cosmetics, and behenic acid, stearic acid and palmitic acid as the fatty acids The total content of the fatty acid and the alkali salt of the fatty acid is 3 to 15% by weight, and the weight ratio of behenic acid / stearic acid / palmitic acid in the fatty acid is 13 to 68/17 to 57/15 to The weight ratio of alkali salt of behenic acid / alkaline stearate / alkali palmitate in the alkali salt of fatty acid is 13 to 68/17 to 57/15 to 50 There as a thing.

  Moreover, the oil-in-water emulsion composition for creamy cosmetics of the present invention is an alkali of the fatty acid with respect to the total content of the fatty acid and the alkali salt of the fatty acid contained in the oil-in-water emulsion composition for creamy cosmetics. It contains 20 to 45% by weight of salt.

Moreover, the oil-in-water type emulsion composition for creamy cosmetics of this invention shall contain 0.1 to 1weight% of higher alcohol in the whole oil-in-water type emulsion composition for creamy cosmetics.
Furthermore, in the oil-in-water emulsion composition for creamy cosmetics of the present invention, the weight ratio of higher alcohol / fatty acid contained in the oil-in-water emulsion composition for creamy cosmetics is less than 1/2.

The oil-in-water emulsion composition for creamy cosmetics of the present invention contains 2 to 14% by weight of oily components excluding behenic acid, stearic acid, and palmitic acid in the entire oil-in-water emulsion composition for creamy cosmetics. There is something to do.
The oil-in-water emulsion composition for creamy cosmetics of the present invention contains only behenic acid, stearic acid, and palmitic acid as the fatty acid.
Furthermore, the cosmetic of the present invention contains the above oil-in-water emulsion composition for creamy cosmetics.

  According to the present invention, an oil-in-water emulsification for creamy cosmetics that does not substantially contain a synthetic surfactant, is difficult to release water on the surface, has excellent stability, and also has an excellent feeling of familiarity. Compositions and cosmetics can be provided.

It is a figure which shows the result of the test 1 for specifying the suitable mixture ratio of behenic acid, a stearic acid, and a palmitic acid in the oil-in-water type emulsion composition for creamy cosmetics which concerns on embodiment of this invention. It is a figure which shows the result of the test 2 for specifying the suitable mixture ratio of behenic acid, a stearic acid, and a palmitic acid in the oil-in-water type emulsion composition for creamy cosmetics which concerns on embodiment of this invention. It is a figure which shows the result of the test 3 for specifying the suitable mixture ratio of behenic acid, a stearic acid, and a palmitic acid in the oil-in-water type emulsion composition for creamy cosmetics which concerns on embodiment of this invention. It is a triangular figure which shows the suitable mixture ratio of behenic acid, a stearic acid, and a palmitic acid in the oil-in-water type emulsion composition for creamy cosmetics which concerns on embodiment of this invention. It is a figure which shows the result of the test 4 for specifying the suitable content rate of the alkali salt (soap part) of the fatty acid in the oil-in-water type emulsion composition for creamy cosmetics which concerns on embodiment of this invention. It is a figure which shows the result of the test 5 for specifying the suitable sum total content of the fatty acid contained in the oil-in-water type emulsion composition for creamy cosmetics which concerns on embodiment of this invention, and the alkali salt of a fatty acid. It is a figure which shows the result of the test 6 for verifying the influence on emulsification stability, a viscosity, and a feeling of use by combined use of the higher alcohol in the oil-in-water type emulsion composition for creamy cosmetics concerning embodiment of this invention. It is a figure which shows the result of the test 7 for specifying the suitable combination of the kind of mixing | blending fatty acid in the oil-in-water type emulsion composition for creamy cosmetics which concerns on embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail.
The oil-in-water emulsion composition for creamy cosmetics according to an embodiment of the present invention contains water, an oily component, a fatty acid and an alkali salt of a fatty acid, and has a viscosity of 2,000 to 90,000 mPa · s. An oil-in-water emulsion composition for use in a creamy cosmetic composition, which is substantially free of a synthetic surfactant and contains behenic acid, stearic acid and palmitic acid as fatty acids, The total content of the fatty acid alkali salt is 3 to 15% by weight, the weight ratio of behenic acid / stearic acid / palmitic acid in the fatty acid is 13 to 68/17 to 57/15 to 50, and the fatty acid alkali salt The weight ratio of alkali behenate / alkali stearate / palmitic acid alkali is 13 to 68/17 to 57/15 to 50.

That is, in the emulsified composition for cosmetics, when the synthetic surfactant is not used or the amount of higher alcohol used is reduced, the emulsification stability is extremely lowered. The creamy cosmetic according to this embodiment According to the oil-in-water emulsion composition for use, behenic acid, stearic acid, palmitic acid, and alkali salts of these three types of fatty acids are used in a specific composition to promote the formation of liquid crystals in the external phase, and to emulsify In addition, the stability is greatly improved, and the emulsion is increased in hardness (increased viscosity), and the flowability of the outer phase is suppressed, so that the destabilization of the emulsification can be suppressed.
In addition, in combination with higher alcohols, which are conventionally known as an emulsion stabilization approach that does not use synthetic surfactants, a relatively high amount (1% or more) of higher alcohol is required, which makes the coating feel and familiarity. The feeling of use such as difficulty is likely to decrease. On the other hand, according to the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, sufficient emulsification stability can be obtained even in a state where no higher alcohol is added, and a small amount of higher alcohol (e.g. 25%), it is possible to obtain an emulsified composition for cosmetics that is excellent in both stability of emulsification and usability.

The “oil-in-water emulsified composition for creamy cosmetics” according to the present embodiment widely includes emulsified compositions used for makeup or beauty.
Examples of products comprising the oil-in-water emulsified composition for creamy cosmetics according to this embodiment include moisture cream, cleansing cream, cold cream, burnishing cream, nourishing cream, foundation cream, shaving cream, hair cream, and hand cream. , Body cream, shampoo, conditioner, emulsion and the like.

The oil-in-water emulsion composition for creamy cosmetics according to the present embodiment contains three types of behenic acid, stearic acid, and palmitic acid as “fatty acids”.
Moreover, the oil-in-water emulsion composition for creamy cosmetics which concerns on this embodiment contains behenic acid alkali salt, stearic acid alkali salt, and palmitic acid alkali salt as "alkali salt of fatty acid (soap part)".
In the production of an oil-in-water emulsion for creamy cosmetics, these fatty acid alkali salts may be contained in the oil-in-water emulsion for creamy cosmetics by reacting the fatty acid and alkali in the system. it can.
Moreover, it can also be made to contain in the oil-in-water type emulsion composition for creamy cosmetics by mix | blending the alkali salt of the fatty acid prepared previously.
Furthermore, it is also possible to make it contain in the oil-in-water emulsion composition for creamy cosmetics by using together the reaction of the fatty acid and alkali in a system, and the mixing | blending of the alkali salt of the fatty acid prepared previously.

  In producing the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, the fatty acid alkali salt is included in the oil-in-water emulsion composition for creamy cosmetics by reacting the fatty acid and alkali in the system. In this case, the oil-in-water emulsion composition for creamy cosmetic contains an alkali salt of a fatty acid obtained by the reaction and a fatty acid (residual fatty acid) remaining without reacting.

  In producing the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, the fatty acid alkali salt is included in the oil-in-water emulsion composition for creamy cosmetics by reacting the fatty acid and alkali in the system. In this case, the ratios of behenic acid, stearic acid, and palmitic acid (sometimes these three types of fatty acids may be referred to as blended fatty acids) to be blended into the oil component as a raw material are the oil-in-water emulsion composition for creamy cosmetics produced. Content of behenic acid, stearic acid and palmitic acid contained in the product, and behenic acid alkali salt, stearic acid alkali salt and alkali palmitate contained in the creamy cosmetic oil-in-water emulsion composition It can be considered equivalent to the salt content.

Examples of the alkali salt of behenate include anionic surfactants such as sodium behenate and potassium behenate, and potassium behenate is particularly preferable.
Similarly, examples of the alkali stearate include anionic surfactants such as sodium stearate and potassium stearate, and potassium stearate is particularly preferred.
Similarly, examples of alkali palmitate include anionic surfactants such as sodium palmitate and potassium palmitate, and potassium palmitate is particularly preferred.

The oil-in-water emulsified composition for creamy cosmetics according to this embodiment has 13 to 68% by weight of behenic acid, 17 to 57% by weight of stearic acid, and 15 to 15% palmitic acid with respect to a total of 100% by weight of fatty acids. To 50% by weight, 13 to 68% by weight of alkali behenate, 17 to 57% by weight of alkali stearate, and 15 to 15% of palmitate Contains 50% by weight.
That is, in FIG. 4, the following five points: (A = 68, B = 17, C = 15); (A = 28, B = 57, C = 15); (A = 13, B = 57, C = 30); (A = 13, B = 37, C = 50); and (A = 33, B = 17, C = 50), each containing a fatty acid and an alkali salt of a fatty acid in a weight ratio within the range surrounded by .
When the content ratio of behenic acid, stearic acid, and palmitic acid, and the content ratio of the alkali salts of these three fatty acids are set in this manner, the resulting oil-in-water emulsion composition for creamy cosmetics is difficult to release and is stable. The state can be maintained for a long period of time, and the usability can be improved.

From such a point of view, the oil-in-water emulsion composition for creamy cosmetics according to this embodiment has 20 to 60% by weight of behenic acid and 20 to 57% by weight of stearic acid with respect to 100% by weight of the total fatty acids. 20 to 40% by weight of palmitic acid, 20 to 60% of behenic acid alkali salt, 20 to 57% by weight of stearic acid alkali salt, and palmitic acid to 100% by weight of the total alkali salt of fatty acid It is preferable to contain 20 to 40% by weight of an alkali salt.
That is, in FIG. 4, the following five points: (A = 60, B = 20, C = 20); (A = 23, B = 57, C = 20); (A = 20, B = 57, C = 23); (A = 20, B = 40, C = 40); and (A = 40, B = 20, C = 40), each containing a fatty acid and an alkali salt of a fatty acid in a weight ratio within the range surrounded by It is preferable.

In addition, the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment comprises 20 to 40% by weight of behenic acid, 30 to 50% by weight of stearic acid, and palmitic acid with respect to 100% by weight of the total fatty acids. 30 to 40% by weight, 20 to 40% of behenic acid alkali salt, 30 to 50% by weight of stearic acid alkali salt, and 30 palmitic acid alkali salt to 100% by weight of the total of alkali salt of fatty acid It is more preferable to contain -40% by weight.
That is, in FIG. 4, the following four points: (A = 40, B = 30, C = 30); (A = 20, B = 50, C = 30); (A = 20, B = 40, C = 40); and (A = 30, B = 30, C = 40), and it is more preferable to contain the fatty acid and the fatty acid alkali salt in a weight ratio within the range surrounded by each.

In the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, the total content of fatty acids and fatty acid alkali salts contained in the oil-in-water emulsion composition for creamy cosmetics is the oil-in-water emulsion for creamy cosmetics. It is preferable to set it as 3 to 15 weight% with respect to the whole quantity of a composition.
When the total content of the fatty acid and the alkali salt of the fatty acid is made in this way, the obtained oil-in-water emulsified composition for creamy cosmetics is difficult to release water, and it is possible to make the feel excellent, and the viscosity can be reduced. This is because it can be made more appropriate.
From such a viewpoint, it is more preferable that the total content of the fatty acid and the alkali salt of the fatty acid is 4 to 13% by weight with respect to the total amount of the oil-in-water emulsion composition for creamy cosmetics, and 9 to 13% by weight. More preferably, it is more preferable to set it as 10 to 12 weight%.

  The oil-in-water emulsified composition for creamy cosmetics according to this embodiment is produced as having a hardness according to the viscosity, and can be used particularly suitably when the viscosity is 2000 to 90000 mPa · s. is there.

In the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, the fatty acid alkali salt, behenic acid alkali salt, stearic acid alkali salt, and palmitic acid alkali salt serve as an emulsifier.
In the oil-in-water emulsion composition for creamy cosmetics according to this embodiment, the content of the fatty acid alkali salt is preferably 20 to 45% by weight with respect to the total content of the fatty acid and the fatty acid alkali salt.
This is because, when the content of the fatty acid alkali salt is set as described above, both the stability and feeling of use of the obtained creamy cosmetic oil-in-water emulsion composition can be improved.
From such a viewpoint, the content of the fatty acid alkali salt is more preferably from 24 to 42% by weight, and even more preferably from 26 to 42% by weight, based on the total content of the fatty acid and the fatty acid alkali salt. .

The oil-in-water emulsion composition for creamy cosmetics according to this embodiment comprises an emulsifier comprising an oily component containing behenic acid, stearic acid and palmitic acid, and an aqueous component containing water in the presence of the alkali salt of the fatty acid. It can be produced by mixing and emulsifying.
The oily components excluding behenic acid, stearic acid, and palmitic acid, which are raw materials of the creamy cosmetic oil-in-water emulsion composition according to the present embodiment, are oil components that are blended in a normal oil-in-water emulsion composition. There are no particular restrictions, such as olive oil, almond oil, sesame oil, avocado oil, castor oil, camellia oil, macadamia nut oil, hazelnut oil, kukui nut oil, rosehip oil, apricot oil, rapeseed oil, baobab oil, Arganian spinosa kernel oil , Sunflower oil, rice bran oil, jojoba oil, flaxseed oil, corn oil, grape seed oil, wheat germ oil, rice germ oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil, mink oil, egg yolk oil, palm Oil, palm oil, palm kernel oil, shea fat, cacao butter, beef tallow, sheep fat, lard, horse tallow and other acylglycerols and their hardened oil, fractionated oil, esterification Oil, jojoba oil, beeswax, candelilla wax, carnauba wax, Japan wax, jojoba wax, cotton wax, sunflower wax, rice wax, wax and lanolin, squalane, may be appropriately contained a hydrocarbon oil such as squalene.
In the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, the content of oily components excluding behenic acid, stearic acid, and palmitic acid is based on the total amount of the oil-in-water emulsion composition for creamy cosmetics, For example, the content is preferably 2 to 14% by weight.

The water-soluble component that is the raw material of the creamy cosmetic oil-in-water emulsion composition according to the present embodiment is not limited to water, and may include other components such as a moisturizing agent. Examples of humectants include glycerin, propanediol, 1,3-butylene glycol, sorbitol, xylitol, inositol, trehalose, betaine, glucose, maltose, maltitol, D-mannitol, sucrose, fructose, raffinose, sodium hyaluronate, Examples thereof include glucosylceramide, amylolytic sugar, and amylolytic reduced alcohol.
In the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, the content of the humectant can be, for example, 2 to 25% by weight with respect to the total amount of the oil-in-water emulsion composition for creamy cosmetics. .

  Moreover, in the oil-in-water emulsion composition for creamy cosmetics which concerns on this embodiment, the various extract which has various medicinal effects can be contained as another component of a water-soluble component. For example, aloe extract, fennel extract, chamomile extract, crayfish extract, columbine extract, chimpi extract, birch extract, loquat extract, perilla extract, hiba mata extract, button pi extract, loofah extract, mugwort extract, diou extract, honeysuckle extract, juicy extract, green tea extract , Oat extract, sage extract, rosemary extract, clove extract, licorice extract, quince seed extract, maple leaf extract, peppermint extract, yokuinin extract, hawthorn extract, wild rose extract, bilberry extract, pomegranate extract, rice bran extract, ginseng extract, carrot extract , Tomato extract, Sakuhakuhi extract, Peonies extract, Yukinoshita extract, Eucalyptus extract, Placenta extract, Sil It may contain an extract and the like.

In producing the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, the fatty acid alkali salt is included in the oil-in-water emulsion composition for creamy cosmetics by reacting the fatty acid and alkali in the system. In this case, as described above, the alkali is preferably blended so that the content of the alkali salt of the fatty acid is 20 to 45% by weight with respect to the total content of the fatty acid and the alkali salt of the fatty acid. It is more preferable to mix | blend so that it may become%, and it is still more preferable to mix | blend so that it may become 26 to 42 weight%.
As the alkali, potassium hydroxide, sodium hydroxide, or the like can be used, and potassium hydroxide is preferably used.

The oil-in-water emulsion composition for creamy cosmetics according to the present embodiment can be produced without containing a synthetic surfactant. This "synthetic surfactant" is a non-naturally occurring component that has both a hydrophilic group and a lipophilic group in one molecule and has emulsifying power, solubilizing power, dispersing power, etc. It is.
Specifically, for example, sucrose fatty acid ester, sorbitan fatty acid ester, POE-sorbitan fatty acid ester, fatty acid alkanolamide, POE-alkyl ether, POE-alkyl phenyl ether, POE · POP-glycol, POE · POP-alkyl ether, and Examples thereof include POE (polyoxyethylene chain, POP represents polyoxypropylene chain).
In addition, the soap component contained in the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment is a kind of surfactant, but it is a synthetic surfactant as “pure soap fraction” in the household goods quality labeling method. And is distinct from synthetic surfactants.

In the production of the oil-in-water emulsion composition for creamy cosmetics according to this embodiment, the remaining amount of water excluding other components is blended.
The water content in the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment can be 60 to 90% by weight, for example, with respect to the total amount of the oil-in-water emulsion composition for creamy cosmetics.
In addition, to the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, other commonly used antioxidants, preservatives, thickeners, pH adjusters, chelating agents, ultraviolet scattering agents, You may contain a ultraviolet absorber, an inorganic mineral, a whitening agent, a fragrance | flavor, a pigment | dye, etc.

Furthermore, a higher alcohol can also be contained in the oil-in-water emulsion composition for creamy cosmetics according to this embodiment. Examples of the higher alcohol include jojoba alcohol, cured jojoba alcohol, lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, and the like.
As described above, in order to stabilize an emulsified composition with a higher alcohol, it is necessary to contain a relatively large amount of a higher alcohol. Therefore, depending on the composition, the feeling of use such as film feeling and powderiness may be reduced. May bring. However, by using a higher alcohol together with the fatty acid composition in the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, a dramatic improvement in stability can be seen even with the addition of a relatively small amount of a higher alcohol. It is possible to produce an oil-in-water emulsified composition for creamy cosmetics that is excellent in feeling and has improved stability.
At this time, the content of the higher alcohol is preferably 0.1 to 1% by weight, and preferably 0.25 to 0.9% by weight, based on the total amount of the oil-in-water emulsion composition for creamy cosmetics. It is more preferable.
Further, the content of the higher alcohol is preferably less than 1/2 with respect to the content of the fatty acid contained in the oil-in-water emulsion composition for creamy cosmetics.

Hereinafter, although the test etc. which were performed in order to identify the composition of the fatty acid suitable for the creamy cosmetic oil-in-water emulsion composition for cosmetics and the alkali salt of the fatty acid will be described in detail, the present invention has the following configuration It is not limited to.
In the following tests, the fatty acid alkali salt is contained in the oil-in-water emulsion composition for creamy cosmetics by reacting the fatty acid and alkali in the system. The ratio of behenic acid, stearic acid, and palmitic acid to be blended in the oil-in-water emulsion composition for ingredients is the content ratio of behenic acid, stearic acid, and palmitic acid contained in the oil-in-water emulsion composition for creamy cosmetics, Moreover, since it is the same as the content rate of the behenic acid alkali salt, the stearic acid alkali salt, and the palmitic acid alkali salt which are contained in the oil-in-water emulsion composition for creamy cosmetics, a composition is represented as a ratio of a blended fatty acid.

[Test 1]
In order to specify a fatty acid composition suitable for the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, among the three types of fatty acids of behenic acid, stearic acid, and palmitic acid, first, one type or a combination of two types The oil-in-water emulsified composition for creamy cosmetics was produced for each composition ratio, and the emulsion stability, viscosity, and feeling of use were evaluated.

Specifically, in order to specify a suitable blending ratio range of three components of behenic acid, stearic acid, and palmitic acid to be blended in the oil-in-water emulsion composition for creamy cosmetics according to this embodiment, the following B1 The test was carried out for six fatty acid compositions up to ~ B6.
Hereinafter, the ratios of behenic acid, stearic acid, and palmitic acid to the total blending amount of behenic acid, stearic acid, and palmitic acid to be blended in the oil-in-water emulsion composition for creamy cosmetics according to this embodiment are Acid (wt%): stearic acid (wt%): palmitic acid (wt%)).

B1 (100: 0: 0)
B2 (0: 100: 0)
B3 (0: 0: 100)
B4 (50: 50: 0)
B5 (0:50:50)
B6 (50: 0: 50)

Manufacture of the oil-in-water type emulsion composition for creamy cosmetics was performed as follows.
First, as the oil component, the total blending amount of the blended fatty acid was 10% by weight of the total amount of the oil-in-water emulsion composition for creamy cosmetics, and the fatty acid component was formulated in each of the above ratios for each of B1-6. As other oil components, 8% by weight of liquid oil composed of high oleic sunflower oil, jojoba oil, olive squalane, 0.12% by weight of preservative, and 0.05% by weight of antioxidant were formulated. And these oil-based components were mixed.

  Further, as the water-soluble component, 18% by weight of glycerin and 0.1% by weight of the extract component were formulated. Further, a 48% KOH aqueous solution was formulated as an alkali so that the total content of fatty acid alkali salts was 3.0% by weight, and the remaining components were all water, and these water-soluble components were mixed.

  Next, the oil component was heated to 70 ° C., the water-soluble component was heated to 75 ° C., the oil component was added to the water-soluble component, and the mixture was uniformly emulsified using a vacuum emulsifier PVQ-3UN (manufactured by Mizuho Kogyo Co., Ltd.). . Then, it cooled to room temperature, stirring and mixing the obtained emulsion composition, and obtained the oil-in-water type emulsion composition for creamy cosmetics.

The emulsion stability of the oil-in-water emulsion composition for creamy cosmetics was evaluated by the following test method.
That is, 40 g of creamy cosmetic oil-in-water emulsified composition one day after manufacture is placed in the bottom of a stand pack bag with a zipper Lami Zip LZ-9 (manufactured by Production Nippon Co., Ltd.) and the bag is inflated to some extent. The chuck was sealed and sealed with a heat seal. This was put into a 10 degreeC thermostat and left to stand for 3 hours or more. Next, the rheometer lifting table to which the pressure rod was fixed was placed in a thermostatic bath, and the bag was fixed to the table with double-sided tape. The table was operated and adjusted so that the pressure bar could sufficiently press the cream at the bottom of the bag. And using this pressurizer, pressurization was performed 24 times per minute for 24 hours. After the pressurization was completed, the cream was brought to the bottom and turned upside down, and stored as it was in a 10 ° C. thermostatic bath.

Moreover, about the following commercially available cream, the emulsion stability was evaluated by the same method as the above.
That is, an emulsified composition for cosmetics (commercial cream A) in which glyceryl (stearic acid / malic acid), which is a synthetic surfactant, is used as an emulsifier, and hydrogenated lecithin, which is a natural surfactant, are used as an emulsifier. The cosmetic emulsion composition (commercial cream B) was evaluated.
As a result, the commercially available cream A was separated on the 4th day after the start of storage, and the commercially available cream B was separated on the second day after the start of storage.

Therefore, the evaluation standard of the emulsion stability of the oil-in-water emulsion composition for creamy cosmetics in the above test is based on the period from the storage start date to the date when water separation was confirmed (period until water separation in the figure), It was defined as follows.
・ Water separation during pressurization: very low (X in the figure)
・ Water separation in 1 to 3 days: Relatively low (△ in the figure)
・ Water separation in 4-6 days: Relatively high (○ in the figure)
・ Wet water in 7-19 days: very high (◎ in the figure)
・ Weaning after 20 days: Extremely high (☆ in the figure)

  The viscosity of the oil-in-water emulsified composition for creamy cosmetics was evaluated by measuring the viscosity [mPa · s] for the cream on the next day of manufacture using a VISCOMETER (BROOKFIELD) and No. 4 rotor. .

Evaluation of the feeling of use of the oil-in-water emulsion composition for creamy cosmetics was performed by evaluating the feeling of use when the cream on the next day of manufacture was applied to the skin in a room at 20 ° C.
Specifically, each of the four indicators of familiarity, wateriness, moisturizing feeling, and film feeling was evaluated according to the following four criteria, and these were totaled for comprehensive evaluation.
(Individual evaluation of each indicator)
・ 4 points: very good ・ 3 points: relatively good ・ 2 points: relatively bad ・ 1 point: very bad (overall evaluation)
・ 13 points or more: Very good (◎ in the figure)
・ 11,12 points: Relatively good (○ in the figure)
・ 9,10 points: Relatively bad (△ in the figure)
・ 8 points or less: Very bad (× in the figure)

  The evaluation results of the emulsion stability, viscosity, and feeling of use of the oil-in-water emulsion composition for creamy cosmetics for B1 to B6 and the evaluation results of the emulsion stability for commercial creams A and B are shown in FIG. In addition, since B1-B3 was water-separated immediately after manufacture, the usability | use_condition is not evaluated.

As FIG. 1 shows, the oil-in-water type emulsion composition for creamy cosmetics obtained by mix | blending only 1 component or 2 components among behenic acid, stearic acid, and palmitic acid (Comparative Examples 1-6) It can be seen that the stability is very low or relatively low.
Commercial cream A (Comparative Example 7) in which glyceryl (stearic acid / malic acid), which is a synthetic surfactant, was used as an emulsifier was relatively stable and was obtained by blending only one or two components. It can be seen that the oil-in-water emulsion composition for creamy cosmetics is inferior in stability to the commercially available cream A.
Moreover, the commercially available cream B (Comparative Example 8) in which hydrogenated lecithin, which is a natural surfactant, was used as an emulsifier, had relatively low stability.

[Test 2]
Next, the ratio of the three components behenic acid, stearic acid, and palmitic acid to be blended in the oil-in-water emulsion composition for creamy cosmetics is set to 10 types of E1 to E10 below, and each oil-in-water type for creamy cosmetics. Emulsified compositions were produced and evaluated for emulsion stability, viscosity, and usability. The production method of the oil-in-water emulsion composition for creamy cosmetics in this test and the evaluation method for emulsion stability, viscosity, and feeling of use are the same as in Test 1.

E1 (80:10:10)
E2 (10:80:10)
E3 (10:10:80)
E4 (45:45:10)
E5 (10:45:45)
E6 (45:10:45)
E7 (33:33:33)
E8 (57:22:22)
E9 (22:57:22)
E10 (22:22:57)

The evaluation results of the emulsion stability, viscosity, and feeling of use of the oil-in-water emulsion composition for creamy cosmetics for E1 to 10 are shown in FIG.
In FIG. 2, the fatty acid composition of E7 (33:33:33) (Example 1), E8 (57:22:22) (Example 2), and E9 (22:57:22) (Example 3). The oil-in-water emulsion composition for creamy cosmetics exhibits extremely high or very high stability. Moreover, the feeling of use of these oil-in-water emulsion compositions for creamy cosmetics is very good or relatively good, and the viscosity shows an appropriate value.

[Test 3]
Next, in order to specify a suitable blending ratio of three components of behenic acid, stearic acid, and palmitic acid to be blended in the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment, the following nine patterns are further specified. The oil-in-water emulsion compositions for creamy cosmetics were produced, and the emulsion stability, viscosity, and feeling of use were evaluated. The production method of the oil-in-water emulsion composition for creamy cosmetics in this test and the evaluation method for emulsion stability, viscosity, and feeling of use are the same as in Test 1.

G1 (20:70:10)
G2 (20:60:20)
G3 (20:40:40)
G4 (40:20:40)
G5 (20:50:30)
G6 (20:30:50)
G7 (30:20:50)
G8 (67:17:17)
G9 (60:20:20)

The evaluation results of emulsion stability, viscosity, and feeling of use of the oil-in-water emulsion composition for creamy cosmetics for G1 to 9 are shown in FIG.
In FIG. 3, G3 (20:40:40) (Example 4), G4 (40:20:40) (Example 5), G5 (20:50:30) (Example 6), G6 (20: 30:50) (Example 7), G7 (30:20:50) (Example 8), G8 (67:17:17) (Example 9), and G9 (60:20:20) (Example) The oil-in-water emulsified composition for creamy cosmetics having the fatty acid composition of 10) is extremely high, very high, or exhibits relatively high stability. Moreover, the feeling of use of these oil-in-water emulsion compositions for creamy cosmetics is very good or relatively good, and the viscosity shows an appropriate value.

(Specification of emulsion stability range)
The composition of the blended fatty acid that was confirmed to show excellent emulsification stability and usability in tests 1 to 3 is shown in a triangular diagram. In addition, as above-mentioned, in this test, the ratio of a mixing | blending fatty acid is the content rate of the fatty acid in the oil-in-water type emulsion composition for creamy cosmetics, and the alkali of the fatty acid in the oil-in-water type emulsion composition for creamy cosmetics. It is the same as the salt content. The result is shown in FIG.
4, (A) shows behenic acid, (B) shows stearic acid, (C) shows palmitic acid, the right hypotenuse shows the weight percent of behenic acid, and the left hypotenuse shows stearic acid. The bottom side represents the weight percent of palmitic acid. An arbitrary point in the triangular diagram can represent a fatty acid composition in which the total of these three types of fatty acids is 100% by weight.

  The fatty acid composition confirmed to exhibit excellent emulsification stability and usability is as follows: (A = 68, B = 17, C = 15); (A = 28, B = 57, C = 15) ); (A = 13, B = 57, C = 30); (A = 13, B = 37, C = 50); and (A = 33, B = 17, C = 50) It can be seen that it is present in the range, that is, behenic acid in the range of 13-68% by weight, stearic acid in the range of 17-57% by weight, and palmitic acid in the range of 15-50% by weight.

  Most of them are the following five points: (A = 60, B = 20, C = 20); (A = 23, B = 57, C = 20); (A = 20, B = 57, C = 23) ); (A = 20, B = 40, C = 40); and (A = 40, B = 20, C = 40), a range of weight ratio, that is, behenic acid is 20 to 60% by weight, stearic acid Is present in the range of 20 to 57% by weight and palmitic acid in the range of 20 to 40% by weight.

Furthermore, the following four points: (A = 40, B = 30, C = 30); (A = 20, B = 50, C = 30); (A = 20, B = 40, C = 40); (A = 30, B = 30, C = 40) The range of weight ratios, that is, behenic acid is 20-40% by weight, stearic acid is 30-50% by weight, and palmitic acid is 30-40% by weight. It can be seen that the range has concentrated fatty acid compositions particularly excellent in emulsion stability.
Thus, the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment is the composition of the above-described blended fatty acid, that is, the fatty acid content in the oil-in-water emulsion composition for creamy cosmetics, and the creamy makeup. In the range of the content ratio of the fatty acid alkali salt in the oil-in-water emulsion composition for use in foods, it became clear that particularly excellent emulsification stability and usability were exhibited.

[Test 4]
The test for specifying the suitable content rate of the alkali salt of the fatty acid in the oil-in-water type emulsion composition for creamy cosmetics which concerns on this embodiment was done.
Specifically, the total amount of blended fatty acids in the oil-in-water emulsion composition for creamy cosmetics is 10% by weight, and the content of the fatty acid alkali salt is 2.0% by weight, 2.5% by weight, 3.0%. Each creamy makeup with weight%, 3.5 weight%, 4.0 weight%, 4.5 weight%, 5.0 weight%, 5.5 weight% and fatty acid composition (20:50:30) An oil-in-water emulsion composition was prepared and evaluated for each emulsion stability, viscosity, and feeling of use. The production method of the oil-in-water emulsion composition for creamy cosmetics and the evaluation method for the emulsion stability, viscosity, and feeling of use for the other points of this test are the same as in Test 1. The result is shown in FIG. In addition, the oil-in-water emulsion composition for cream cosmetics of K3 in FIG. 5 is the same as that of G5 (Example 6) mentioned above.

In FIG. 5, “fatty acid blending amount” indicates the total blending amount of behenic acid, stearic acid, and palmitic acid blended in the oil-in-water emulsion composition for creamy cosmetics.
“Fatty acid alkali salt (A)” indicates the total content of potassium behenate, potassium stearate and potassium palmitate contained in the oil-in-water emulsion composition for creamy cosmetics.
“Fatty acid + fatty acid alkali salt (B)” indicates the total content of fatty acid and fatty acid alkali salt contained in the oil-in-water emulsion composition for creamy cosmetics. It corresponds to the total blending amount.
“Soap fraction (A / B)” indicates the ratio of the total content of fatty acid alkali salt to the total content of fatty acid and fatty acid alkali salt contained in the oil-in-water emulsion composition for creamy cosmetics. Yes.
These definitions are the same in FIGS. 6 and 7 described later.

As shown in FIG. 5, the oil-in-water emulsion composition for creamy cosmetics (Comparative Example 18) having a fatty acid alkali salt of 2.0% by weight and a soap content of 19.4% by weight has an appropriate viscosity. Although it showed a relatively good feeling of use, it showed very low stability.
On the other hand, an oil-in-water emulsion composition for creamy cosmetics having a fatty acid alkali salt content of 2.5 to 4.5% by weight and a soap content of 24.0 to 41.9% by weight (Examples 11, 7, 12 to In 14), the viscosity was an appropriate value, very good or relatively good feeling of use, and extremely high or very high stability.
In addition, the oil-in-water emulsion composition for creamy cosmetics (Comparative Examples 19 and 20) having a fatty acid alkali salt of 5.0 to 5.5% by weight and a soap content of 46.2 to 50.4% by weight, Although the viscosity was an appropriate value and showed a very good or relatively good feeling of use, it showed a very low or relatively low stability.

  Therefore, the oil-in-water emulsified composition for creamy cosmetics according to the present embodiment has a fatty acid alkali salt relative to the total content of fatty acids and fatty acid alkali salts contained in the creamy cosmetic oil-in-water emulsified composition. It has been found that it is preferable to contain 20 to 45% by weight.

[Test 5]
A test for specifying a suitable total content of fatty acids and fatty acid alkali salts contained in the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment was conducted.
Specifically, for each of the cases where the amount of fatty acid in the oil-in-water emulsion composition for creamy cosmetics is 2 wt%, 4 wt%, 8 wt%, 12 wt%, 16 wt%, Each creamy cosmetic oil-in-water emulsion composition was prepared with 28.6% by weight and the fatty acid composition (33:33:33), and the emulsion stability, viscosity, and feeling of use were evaluated. The production method of the oil-in-water emulsion composition for creamy cosmetics and the evaluation method for the emulsion stability, viscosity, and feeling of use for the other points of this test are the same as in Test 1. The result is shown in FIG.

As shown in FIG. 6, the oil-in-water emulsion composition for creamy cosmetics having a total content of fatty acid and fatty acid alkali salt of 2.1% by weight showed a very good feeling of use, but its viscosity was extremely low. It showed very low stability (Comparative Example 21).
On the other hand, the oil-in-water emulsified composition for creamy cosmetics having a total content of fatty acids and fatty acid alkali salts of 4.2 to 12.6% by weight has an appropriate viscosity and exhibits a relatively good feeling of use. It showed very high stability (Examples 15 to 17).
In addition, the oil-in-water emulsion composition for creamy cosmetics having a total content of fatty acids and fatty acid alkali salts of 16.8% by weight has extremely high stability but is relatively poor in use. A feeling was shown (Comparative Example 22).
Therefore, the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment has a total content of fatty acids and fatty acid alkali salts contained in the oil-in-water emulsion composition for creamy cosmetics of 3 to 15% by weight. Has been found to be suitable.

[Test 6]
The test for verifying the influence on the emulsification stability, the viscosity and the feeling of use by the combined use of the higher alcohol in the oil-in-water emulsion composition for creamy cosmetics according to the present embodiment was conducted.
Specifically, the fatty acid content in the oil-in-water emulsion composition for creamy cosmetics is 10% by weight, the soap fraction is 28.6% by weight, the fatty acid composition is (33:33:33), and the behenyl alcohol content is The oil-in-water type emulsion composition for creamy cosmetics was manufactured as 0.25 weight%, 0.5 weight%, and 0.75 weight%. At this time, the water content contained in the oil-in-water emulsion composition for creamy cosmetics was reduced by the content of behenyl alcohol. About the other point, manufacture of the oil-in-water type emulsion composition for creamy cosmetics of this test was performed by the method similar to Test 1. FIG.
And evaluation about the emulsion stability, viscosity, and usability | use_condition of each oil-in-water type emulsion composition for creamy cosmetics was performed. Evaluation methods for emulsion stability, viscosity, and feeling in use are the same as in Test 1. The result is shown in FIG. In addition, the oil-in-water emulsion composition for creamy cosmetics of P1 in FIG. 7 is the same as that of E7 (Example 1) mentioned above.

  As shown in FIG. 7, each of the oil-in-water emulsion compositions for creamy cosmetics produced by containing behenyl alcohol exhibits extremely high stability, very good or relatively good feeling of use, and viscosity. It was an appropriate value (Examples 18 to 20).

[Test 7]
The test for confirming the suitable combination of the kind of mixing | blending fatty acid in the oil-in-water type emulsion composition for creamy cosmetics which concerns on this embodiment was done.
Specifically, in the oil-in-water emulsion composition for creamy cosmetics, the total blending amount of fatty acids is 10% by weight, the soap fraction is 28.6% by weight, and the fatty acid composition is (behenic acid: stearic acid: palmitic acid). ) = (33:33:33), (behenic acid: palmitic acid: oleic acid) = (33:33:33), (behenic acid: stearic acid: myristic acid) = (33:33:33) The oil-in-water emulsion composition for creamy cosmetics was manufactured, and each emulsion stability, viscosity, and usability were evaluated. The production method of the oil-in-water emulsion composition for creamy cosmetics and the evaluation method for the emulsion stability, viscosity, and feeling of use for the other points of this test are the same as in Test 1. The result is shown in FIG. In addition, the oil-in-water emulsion composition for creamy cosmetics of R1 in FIG. 8 is the same as that of E7 (Example 1) mentioned above.

In FIG. 8, “fatty acid blending amount” indicates the total blending amount of behenic acid, stearic acid, palmitic acid, oleic acid, and myristic acid blended in the oil-in-water emulsion composition for creamy cosmetics.
The “fatty acid alkali salt (A)” is the total content of potassium behenate, potassium stearate, potassium palmitate, potassium oleate and potassium myristate contained in the oil-in-water emulsion composition for creamy cosmetics. Show.
“Fatty acid + fatty acid alkali salt (B)” and “soap ratio (A / B)” are the same as defined in Test 4.

As shown in FIG. 8, when the fatty acid composition is (behenic acid: stearic acid: palmitic acid) = (33:33:33), the viscosity is an appropriate value, indicating a very good feeling of use and very high. Stability was shown (Example 1).
On the other hand, when the fatty acid composition is (behenic acid: palmitic acid: oleic acid) = (33:33:33), the viscosity is an appropriate value, and although it shows a very good feeling of use, it has a very low stability. (Comparative Example 22) In addition, when the fatty acid composition is (behenic acid: stearic acid: myristic acid) = (33:33:33), the viscosity is an appropriate value and a relatively good usability is shown, but a relatively low stability is obtained. (Comparative Example 23)
Therefore, it was confirmed that (behenic acid: stearic acid: palmitic acid) was suitable as a combination of the types of blended fatty acids in the oil-in-water emulsion composition for creamy cosmetics.

As mentioned above, although preferable embodiment and the Example of the oil-in-water type emulsion composition for creamy cosmetics of this invention were demonstrated, the oil-in-water type emulsion composition for creamy cosmetics of this invention is limited to these embodiment and Example. It goes without saying that various modifications can be made within the scope of the present invention.
For example, as the oily component other than the fatty acid, other liquid oils different from those in Examples can be appropriately changed.

  The present invention can be suitably used when producing an emulsified composition for cosmetics without containing a synthetic surfactant.

Claims (7)

An oil-in-water emulsion composition for creamy cosmetics comprising water, an oily component, a fatty acid and an alkali salt of the fatty acid, and having a viscosity of 2,000 to 90,000 mPa · s,
In the whole oil-in-water emulsion composition for creamy cosmetics, it contains substantially no synthetic surfactant,
Containing the behenic acid, stearic acid and palmitic acid as the fatty acid, the total content of the fatty acid and the alkali salt of the fatty acid is 3 to 15 wt%,
The weight ratio of behenic acid / stearic acid / palmitic acid in the fatty acid is 13-68 / 17-57 / 15-50,
The weight ratio of alkali behenate / alkali stearate / alkali palmitate in the alkali salt of fatty acid is 13 to 68/17 to 57/15 to 50. Emulsified composition.   2. The alkali salt of the fatty acid is contained in an amount of 20 to 45% by weight based on the total content of the fatty acid and the fatty acid alkali salt contained in the oil-in-water emulsion composition for creamy cosmetics. The oil-in-water emulsified composition for creamy cosmetics described in 1.   The oil-in-water type emulsion composition for creamy cosmetics of Claim 1 or 2 which contains 0.1 to 1weight% of higher alcohol in the whole oil-in-water type emulsion composition for creamy cosmetics.   The oil-in-water emulsion composition for creamy cosmetics according to claim 3, wherein the weight ratio of higher alcohol / fatty acid contained in the oil-in-water emulsion composition for creamy cosmetics is less than 1/2.   The oily component excluding behenic acid, stearic acid, and palmitic acid is contained in an amount of 2 to 14% by weight based on the whole oil-in-water emulsion composition for creamy cosmetics. An oil-in-water emulsion composition for creamy cosmetics.   The oil-in-water emulsion composition for creamy cosmetics according to any one of claims 1 to 5, wherein the fatty acid contains only behenic acid, stearic acid, and palmitic acid.   Cosmetics containing the oil-in-water emulsion composition for creamy cosmetics in any one of Claims 1-6.

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