JP5720998B2 - Cosmetic base and cosmetic comprising the same - Google Patents

Description

  The present invention relates to a cosmetic base comprising a polyalkylene glycol derivative and a cosmetic comprising the same.

Oily bases are widely used in cosmetics in order to impart smoothness and moist feeling to the skin and hair. Oily bases include hydrocarbon oils such as liquid paraffin and squalane, oils and triglycerides such as vegetable oils, ester oils with ester bonds, and silicone oils such as dimethylsiloxane. For this purpose, there are various emulsified forms such as an oil-in-water type and a water-in-oil type (hereinafter sometimes abbreviated as O / W type and W / O type, respectively).
Among these, W / O type emulsified cosmetics have excellent functions such as prevention of moisture transpiration and protecting the skin from drying, and consumer needs are also increasing. However, although there is such a function, since the outer phase is an oil phase, there is a drawback in the feeling of use that oiliness remains. Furthermore, it was difficult to maintain the stability of emulsification as compared with O / W type emulsified cosmetics. One reason for this is a decrease in the viscosity of the oil phase (continuous phase). It is believed that the decrease in viscosity results in an increase in particle movement speed and, as a result, promotes particle aggregation and creaming according to Stokes' law. Therefore, there has been a proposal to obtain a highly stable emulsion by adding viscosity to the oil phase by blending solid and semi-solid oils, but it is sticky and sufficiently satisfactory for use. It wasn't.

As a method for improving the feeling of use, there is a proposal for increasing the internal water phase ratio to provide a fresh feeling of use (for example, Patent Document 1). In this proposal, emulsification stability is maintained by using an emulsifier selected from glyceryl monooleate, glyceryl monoisostearate, polyoxyethylene glyceryl monoisostearate, but smoothness during application and familiarity with the skin It was not satisfactory enough.
Furthermore, as a method for improving the feeling of use, there is a proposal of blending a volatile oil component in the oil phase (for example, Patent Document 2). This proposal is characterized by containing a highly volatile oil component composed of a chain silicone oil or a hydrocarbon oil and a polyoxyalkylene-organopolysiloxane alternating block copolymer. However, when a volatile oil component having a high volatilization rate is blended as a main component, skin conformity after application and emulsification stability are not satisfactory.
Furthermore, the proposal of the gel-like composition using a linear block type alkylene oxide derivative is also made | formed (for example, patent document 3). In this proposal, moderate viscosity can be imparted and the feeling in use is good, but the emulsion stability is not sufficiently satisfactory.
For this reason, it has been desired to develop a W / O type emulsified cosmetic having good usability such as smoothness at the time of application and familiarity with the skin and good emulsification stability.

JP 2008-24630 A JP 2010-159222 A JP 2008-19239 A

  The problem to be solved by the present invention is to provide a cosmetic base having good usability such as smoothness at the time of application and familiarity with the skin, and also excellent in emulsion stability. Furthermore, it is to provide a cosmetic having excellent feel and emulsion stability, in particular, a water-in-oil emulsion cosmetic.

As a result of intensive studies to solve the above problems, the present inventors have found that the problems of the present invention can be achieved by blending a specific polyalkylene glycol derivative as a cosmetic base.
That is, the present invention is as follows.
(1) A cosmetic base comprising a polyalkylene glycol derivative represented by the following formula (I).
Z- {O- (AO) _a- (EO) _k- (AO) _b -R} _m (I)

(In the formula, Z is a residue obtained by removing a hydroxyl group from a water-soluble polyhydric alcohol having 3 to 6 hydroxyl groups, m is 3 to 6, EO is an oxyethylene group, and AO is an oxyalkylene group having 4 to 8 carbon atoms. EO and AO are bonded in a block form.
a and b are the average addition mole number of AO, k is the average addition mole number of EO, a is 0 , b is 1 to 50, a + b is 1 to 50, k is 10 to 45 , (a + b + k) × m is it is 120-250. Further, the total amount of 100 parts by mass of the EO and AO, the mass ratio of EO is 40-75 parts by weight.
R represents a hydrogen atom or a fatty acid residue having 12 to 24 carbon atoms. )
(2) The cosmetic base according to (1) , wherein AO is a 1,2-oxybutylene group.
(3) A cosmetic comprising the cosmetic base according to (1) or (2).
(4) Contains the following components (A), (I), (U), (E), the content of component (A) relative to the total mass is 0.01 to 30% by mass, component (A) and component The total amount of (U) is 10 to 95% by mass, the content of component (D) is 1 to 70% by mass, and the amount of component (A) is 100 parts by mass with respect to the total amount of component (A) and component (U). A water-in-oil emulsified cosmetic, the amount of which is 10 parts by mass or more.
(A) Base for cosmetics as described in (1) or (2) (I) One or more polar oils selected from ester oils or triglycerides (U) Hydrocarbon oils (E) Water

  The base for cosmetics of the present invention has particularly good compatibility with oily components, and cosmetics formulated with these are excellent in emulsion stability. In particular, water-in-oil emulsified cosmetics formulated with this are excellent when applied to the skin, such as smooth and stretchy, have a good feeling on the skin, are well-familiar with the skin, have less film feeling after application, There is no oiliness and it is excellent in the feeling of use. That is, the present invention has a remarkable effect in that it provides an excellent cosmetic base that satisfies both the emulsion stability and the feeling in use, and a water-in-oil emulsified cosmetic containing the same.

[Cosmetic base]
The cosmetic base according to the present invention is a polyalkylene glycol derivative represented by the following formula (I).
_{Z- {O- (AO) a -} (EO) k - (AO) b -R} m (I)

In formula, Z shows the residue remove | excluding the hydroxyl group from the water-soluble polyhydric alcohol which has 3-6 hydroxyl groups. The water-soluble polyhydric alcohol includes three hydroxyl groups, glycerin, trimethylolpropane, four hydroxyl groups, diglycerin, erythritol, pentaerythritol, sorbitan, methyl glucoside, five hydroxyl groups xylitol, triglycerin, hydroxyl group Are 6 sorbitol, inositol and dipentaerythritol. A residue obtained by removing a hydroxyl group from an alcohol having 4 or more hydroxyl groups is preferable, and diglycerin and pentaerythritol having 4 hydroxyl groups are more preferable from the viewpoints of emulsion stability and usability.
m is 3-6, preferably 4-6, more preferably 4. When m is 2 or less, the desired emulsion stability cannot be obtained when blended in a W / O emulsion cosmetic. When m is 7 or more, the smoothness at the time of application may be impaired, which is not preferable.
EO is an oxyethylene group and is a hydrophilic group of the polyalkylene glycol derivative of the present invention. k is the average number of moles of EO added, and k × m is the total number of moles of EO added in formula (I). k is 1 to 50, preferably 10 to 45. When k is less than 1, sufficient hydrophilicity cannot be obtained, and when used as a W / O type emulsifier, the effect of enclosing water may be inferior. Moreover, when k is larger than 50, not only a sticky feeling is produced, but also the compatibility with the oil agent may be inferior.

AO is an oxyalkylene group having 4 to 8 carbon atoms and serves as a lipophilic group of the polyalkylene glycol derivative of the present invention. 1,2-oxybutylene group having 4 carbon atoms, 1,2-oxypentylene group having 5 carbon atoms, 1,2-oxyhexylene group having 6 carbon atoms, 1,2-oxyheptylene group having 7 carbon atoms And a 1,2-oxyoctylene group having 8 carbon atoms is preferable, and a 1,2-oxybutylene group or a 1,2-oxyoctylene group is preferable, and a 1,2-oxyoctylene group is more preferable. It is a butylene group.
AO may be one type or two or more types, but in the case of two or more types, the addition form may be either random or block.
a and b are average addition mole number of AO, a is 0-50, b is 0-50, a + b is 1-50, Preferably, it is 5-30. When a + b is smaller than 1, even if R is a fatty acid residue, sufficient lipophilicity cannot be obtained and the emulsion stability is poor. On the other hand, if it exceeds 50, the conformability to the skin may be inferior. (A + b) × m is the total number of added AO moles of formula (I).
Furthermore, when Z is a hydrophilic group-lipophilic group arrangement, that is, a = 0, it is more effective.
(A + b + k) × m is 100 to 300, preferably 120 to 250. If it is less than 100, the desired emulsion stability cannot be obtained. On the other hand, if it is larger than 300, the smoothness during application and the familiarity with the skin may be impaired.
When the total amount of EO and AO is 100 parts by mass, the mass ratio of EO is 10 to 75 parts by mass, preferably 20 to 75 parts by mass, and more preferably 40 to 75 parts by mass. When it is less than 10 parts by mass, sufficient lipophilicity cannot be obtained and the emulsion stability is poor. On the other hand, if it is larger than 75 parts by mass, the effect of encapsulating water as a W / O type emulsifier may be inferior.
EO and AO are combined in a block shape. In a random state, sufficient emulsification solubilization power cannot be obtained.

R represents a hydrogen atom or a fatty acid residue having 12 to 24 carbon atoms.
When the polyalkylene glycol derivative of the formula (I) is used as a W / O type emulsifier, it is considered that the (AO) _b -R portion that is lipophilic is oriented toward the oil phase.
When R is a fatty acid residue, the esterification rate is 85% or less, preferably 70% or less, assuming that the ratio of the number of hydroxyl groups esterified to the total hydroxyl groups before esterification is the esterification rate. If it is higher than 85%, the smoothness during application may be inferior, which is not preferable. The number of carbon atoms of the fatty acid residue is preferably 16-22. If the carbon number is less than 12, it does not contribute to the improvement of the emulsion stability. When it is larger than 24, the smoothness at the time of application is inferior, which is not preferable.
The fatty acid residue having 12 to 24 carbon atoms may be a saturated fatty acid, an unsaturated fatty acid or a branched fatty acid, and may further be a hydroxyl group-substituted fatty acid. Such fatty acids include lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, eicosanoic acid, behenic acid, tetracosanoic acid, myristolenic acid, palmitoleic acid, olein Acid, elaidic acid, erucic acid, linoleic acid, linolenic acid, arachidonic acid, hydroxystearic acid, coconut oil fatty acid, palm kernel oil fatty acid, hardened palm kernel oil fatty acid, palm oil fatty acid, beef tallow fatty acid, hardened tallow fatty acid, pork tallow fatty acid And fatty acids such as castor oil fatty acid and hydrogenated castor oil fatty acid, and a mixture thereof may be used. Preferred are lauric acid, palmitic acid, stearic acid, isostearic acid, oleic acid, castor oil fatty acid, hardened castor oil fatty acid, and more preferred are castor oil fatty acid and hardened castor oil fatty acid.

The polyoxyalkylene glycol derivative represented by the formula (I) of the present invention can be produced by a known method. For example, after addition polymerization of water-soluble polyhydric alcohol having 3 to 6 hydroxyl groups in the order of oxyethylene, oxyalkylene having 4 to 8 carbon atoms, and oxyethylene in the order of an alkali or acid catalyst, if necessary, with a fatty acid. It can be obtained by an esterification reaction or a transesterification reaction with a fatty acid ester of a lower alcohol.
When a = 0, the formula (I) can also be expressed by the formula (II).
Z- {O- (EO) _k- (AO) _b -R} _m (II)

The polyalkylene glycol derivative of the formula (II) is obtained by adding AO to the polyalkylene glycol derivative of the following formula (III) obtained by addition polymerization of oxyethylene to Z and esterifying with a fatty acid as necessary. Can be obtained.
Z- {O- (EO) _k -H} _m (III)
The polyalkylene glycol derivative of the formula (III) has a polydispersity Mw / Mn of 1.04 in all peaks from the elution start point to the elution end point in gel permeation chromatography (hereinafter sometimes abbreviated as GPC). It is preferable that Those having a polydispersity close to 1 are substances having a narrow molecular weight distribution.
In the formula (I) of the present invention, when a = 0, the polydispersity at the end of the EO addition reaction is 1.04 or less and the distribution is narrow. And the emulsification stability is increased.

  The cosmetic base of the present invention also has an effect of improving the emulsion stability by imparting an appropriate viscosity to the oil agent. Therefore, it is used as a viscosity control agent for oil agents in addition to the W / O type emulsifier. You can also

[Cosmetics]
The cosmetic of the present invention can be blended with various components that are generally used in cosmetics, pharmaceuticals, and the like as long as the effects of the present invention are not impaired. For example, hydrocarbons, higher alcohols, higher fatty acids and their triglycerides, ester oils, waxes, animal and vegetable oils, silicone oils, vitamins, UV absorbers, water-soluble polymers, antioxidants, cationic surfactants, Examples include anionic surfactants, amphoteric surfactants, nonionic surfactants, sequestering agents, ethanol, thickeners, preservatives, dyes, pigments, fragrances, and water.
The cosmetic of the present invention can be suitably used particularly as a W / O type emulsified cosmetic. When used as a W / O emulsified cosmetic, it is effective to use an oil phase composed of ester oil, triglyceride and / or hydrocarbon oil.
For example, it contains the following components (A), (I), (U), (D), the content of the component (A) is 0.01 to 30% by mass relative to the total mass, the component (A) and the component ( The total amount of c) is 10 to 95% by mass, the content of component (d) is 1 to 70% by mass, and the amount of component (a) relative to 100 parts by mass of the total amount of components (b) and (c) Is a water-in-oil emulsified cosmetic composition having a mass of 10 parts by mass or more.

  Among the components (I), triglycerides include caproic acid, caprylic acid, capric acid, 2-ethylhexanoic acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, Eicosanoic acid, behenic acid, tetracosanoic acid, myristolenic acid, palmitoleic acid, oleic acid, elaidic acid, erucic acid, linoleic acid, linolenic acid, arachidonic acid, hydroxystearic acid, palm oil fatty acid, palm kernel oil fatty acid, hardened palm Triglycerides of higher fatty acids having 6 or more carbon atoms such as nuclear oil fatty acid, palm oil fatty acid, beef tallow fatty acid, hardened beef tallow fatty acid, pork tallow fatty acid, castor oil fatty acid, hardened castor oil fatty acid, olive oil, sunflower oil, palm oil, palm kernel oil , Safflower oil, castor oil, hydrogenated castor oil, Shea oil, camellia oil, cacao butter, animal and vegetable fats and oils such as shea butter can be exemplified. As ester oils, ethyl oleate, ethyl linoleate, isopropyl myristate, isopropyl palmitate, isopropyl isostearate, lanolin fatty acid isopropyl, cetyl 2-ethylhexanoate, isocetyl 2-ethylhexanoate, stearyl 2-ethylhexanoate , 2-ethylhexanoate isostearyl, cetyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl isostearate, isostearyl isostearate, trimethylolpropane triisostearate, myristyl myristate, cetyl myristate, octyl myristate Dodecyl, isostearyl myristate, isocetyl myristate, hexyl laurate, decyl oleate, octyldodecyl oleate, isos pivalate Allyl, isopropyl isostearate, isononyl isononanoate, 2-ethylhexyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, octyldodecyl erucate, neopentyl glycol didecanoate, pentaerythrityl tetraethylhexanoate, diisostearyl malate, triethylhexane Acid trimethylolpropane didecyl adipate, didecyl adipate, (adipic acid, 2-ethylhexanoic acid, stearic acid) glyceryl oligoester, glyceryl isostearate, isostearic acid hydrogenated castor oil, cholesteryl isostearate, batyl isostearate, isostearic acid Phytosteryl, octyl oxystearate, dihydrocholesteryl oleate, phytosteryl oleate, di Teratrit fatty acid ester, coconut oil fatty acid pentaerythritol, stearic acid hydrogenated castor oil, soft lanolin fatty acid cholesteryl, hydroxy stearic acid cholesteryl, hexahydroxystearic acid dipentaerythritol, monohydroxy stearic acid hydrogenated castor oil, lanolin fatty acid isostearyl, lanolin Fatty acid isopropyl, lanolin fatty acid octyldodecyl, cholesteryl stearate, lanolin fatty acid cholesteryl, cetyl ricinoleate, dioctyl succinate, cetyl lactate, propylene glycol dicaprylate, propylene glycol dicaprate, propylene glycol dinonanoate, di (capryl / caprate) propylene Glycol, propylene glycol distearate, propylene glycol diisostearate And propylene glycol dioleate. In addition, waxes such as beeswax, mole, carnauba wax, lanolin, candelilla wax, jojoba oil can be used. One or more of these can be used. Preferably, triglycerides of higher fatty acids having 6 or more carbon atoms, animal and vegetable oils and fats, cetyl 2-ethylhexanoate, isocetyl 2-ethylhexanoate, isopropyl palmitate, 2-ethylhexyl palmitate, isopropyl isostearate, 2-hexyl isostearate Examples thereof include decyl, octyldodecyl myristate, isopropyl myristate, isostearyl myristate, isocetyl myristate, isononyl isononanoate, 2-ethylhexyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, beeswax, and mole.

  As the component (c) hydrocarbon oil, liquid paraffin, polybutene, hydrogenated polyisobutene, hydrogenated polydecene, squalane, squalene, pristane, light isoparaffin, light liquid isoparaffin, heavy liquid isoparaffin, liquid isoparaffin, tetradecene, isohexadecane, Examples thereof include isododecane, α-olefin oligomer, petrolatum, microcrystalline wax, paraffin, polyethylene, and ceresin. Preferred are liquid paraffin, hydrogenated polyisobutene, squalane, petroleum jelly and microcrystalline wax. One or more of these can be used.

When the total amount of component (I) and component (U) is 100 parts by weight, the amount of component (I) is 10 parts by mass or more, and preferably 10 to 90 parts by mass. When the amount is 10 parts by mass or less, the compatibility between the component (a) and the oil phase is inferior, and the emulsion stability may be inferior.
The water of component (d) is not particularly limited as long as it is generally used as the water phase of W / O emulsified cosmetics. For example, purified water such as distilled water or ion exchange water, physiological saline, phosphorus An acid buffer aqueous solution or the like can be used. Water is used in an amount of 1 to 70% by mass. When it exceeds 70 mass%, it becomes difficult to encapsulate as a water phase, and a stable emulsified cosmetic cannot be obtained.

Furthermore, the form of the water-in-oil emulsified cosmetic of the present invention can take any form of liquid, semi-solid, and solid at room temperature. It is also possible to contain other components as long as the performance of the present invention is not impaired. For example, lower alcohols, silicone oils, anionic surfactants, amphoteric surfactants, nonionic surfactants, cationic surfactants, semipolar surfactants, water-soluble polymers, organic or inorganic salts, Examples include pH adjusters, bactericides, chelating agents, antioxidants, ultraviolet absorbers, vitamins, natural extracts derived from animals and plants, pigments, pigments, and fragrances.
Moreover, the product form of the cosmetic formed by blending the cosmetic base of the present invention is not particularly limited to the above-described form, but is preferably a skin external preparation. Skin external preparations include skin care cosmetics such as lotions, emulsions, creams and packs; makeup cosmetics such as foundations, lipsticks and eye shadows; sunscreen cosmetics; body cosmetics; aromatic cosmetics; cleansing oils, etc. Skin cosmetics such as make-up removers, body shampoos, hand soaps; hair cosmetics such as hair liquids, hair oils, hair tonics, hair restorers; ointments and the like.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to this.
The synthesis example of the base for cosmetics which concerns on this invention is shown. In each synthesis example, the hydroxyl value is JISK1557.
Measured according to 6.4.
The polydispersity in GPC was measured by the following system.
Analytical instrument: SHODEX GPC SYSTEM-11 (manufactured by Showa Denko)
Standard substance: Polyethylene glycol Sample size: 10% x 100 x 0.001 mL
Eluent: THF
Flow rate: 1.0 mL / min
Column: SHODEX KF804L (manufactured by Showa Denko)
Column size: I.D. D. 8mm x 30cm x 3
Column temperature: 40 ° C
Detector: RI x 8

[Synthesis example]
Synthesis Example 1: Polyoxybutylene (48 mol) Polyoxyethylene (88 mol) Pentaerythritol ether (Compound 1)
After charging 45 g of pentaerythritol, 50 g of toluene, and 8.0 g of potassium hydroxide into the autoclave and replacing the air in the autoclave with dry nitrogen, 1292 g of ethylene oxide was dropped from a dropping device at 110 ° C. with stirring. Stir for 2 hours. Subsequently, 1160 g of 1,2-butylene oxide was added dropwise at 110 ° C. and stirred for 2 hours. Thereafter, the reaction product is taken out from the autoclave, neutralized with hydrochloric acid to pH 6-7, and subjected to vacuum treatment at 115 ° C. for 1 hour to remove contained toluene and moisture, and finally filtered. The salt was removed to give 2345 g of compound 1. The hydroxyl value was 56.0 mgKOH / g after the ethylene oxide reaction and 30.0 mgKOH / g after the 1,2-butylene oxide reaction. Moreover, the polydispersity was 1.025 as a result of GPC after the ethylene oxide reaction.

Synthesis Example 2: Tricastor oil fatty acid polyoxybutylene (30 mol) polyoxyethylene (60 mol) glyceryl (compound 2)
After charging 31 g of glycerin and 5.0 g of potassium hydroxide into the autoclave and replacing the air in the autoclave with dry nitrogen, 885 g of ethylene oxide was added dropwise from a dropping device at 140 ° C. with stirring and stirred for 2 hours. Subsequently, 725 g of 1,2-butylene oxide was added dropwise at 140 ° C. and stirred for 2 hours. Thereafter, the reaction product is taken out from the autoclave, neutralized with hydrochloric acid to pH 6-7, and subjected to reduced pressure treatment at 100 ° C. for 1 hour to remove the contained water, and finally filtered to obtain a salt. Then, 1550 g of polyoxybutylene (30 mol) polyoxyethylene (60 mol) glyceryl ether (compound 3a) was obtained. The hydroxyl value was 62.1 mgKOH / g after the ethylene oxide reaction and 35.0 mgKOH / g after the 1,2-butylene oxide reaction.
The compound 3a1223g obtained and the castor oil hardened fatty acid 150g were made to react at 200 degreeC for 10 hours, and the compound 2 was obtained. Since the hydroxyl value was 11.5 mgKOH / g, the esterification rate was 67%. In addition, as a result of GPC after the ethylene oxide reaction, the polydispersity was 1.028.
According to the synthesis examples 1 and 2, polyalkylene glycol derivatives having the compositions shown in Table 1 below were synthesized.

<Example 1-7, Comparative Examples 1-7>
A W / O type emulsion was prepared with the composition shown in Table 2, and the feeling of use and the emulsion stability were evaluated. Preparation method [oil phase]
(A) or (A ') component (I) component (U) component sorbitan monooleate polyoxyethylene (20 mol) sorbitan monooleate monoglycerin polyoxyethylene (5 mol) glyceryl monoisostearate preservative Fragrance [Aqueous phase]
(D) Component 1,3-butylene glycol dipropylene glycol glycerin

  The oil phase and the aqueous phase are dissolved by heating at 70 to 80 ° C., respectively. While stirring at 5000 rpm using a homogenizer at the same temperature, the water phase was gradually added to the oil phase and stirred at 5000 rpm for 10 minutes. Then, it cooled rapidly to 40 degrees C or less, and obtained the emulsion.

Usability Evaluation Method Twenty professional female panelists evaluated the obtained emulsion for [smoothness during application] and [familiarity to the skin after application] according to the following criteria. An acceptance criterion of 3.5 points or more was used. The evaluation results are also shown in Table 2.
[Smoothness during application]
Under the environment of 25 ° C. and 50% relative humidity, the emulsion immediately after the preparation was applied to the inner side of the forearm, and the usability during application was evaluated according to the following criteria.
5: Very good and very light touch 4: Good and light feel 3: Slightly poor, slightly squeezed feel 2: Slightly poor and heavy feel 1: Very poor and sticky feel [ Familiarity to skin]
Subsequent to the evaluation of [Smoothness during application], conformity to the skin after 1 hour in an environment of 25 ° C. and 50% relative humidity was evaluated according to the following criteria.
5: Feeling of the skin is good and the skin is softening 4: Feeling of the skin is moderate and the skin is softening 3: The skin feeling is slightly strong, but the skin is softening 2: The film Feels slightly strong and feels slightly softer on the skin 1: Feels strong and the skin feels tight

Evaluation Method of Emulsification Stability Immediately after emulsification, the state of storage at room temperature and 40 ° C. for 1 month was visually observed.
◯: Maintain the emulsified state.
○: Slightly separated at the bottom, but stable overall.
X: An oil phase appears in the upper part, a surfactant phase in the middle part, and an aqueous phase in the lower part.
XX: Separation

Examples of the formulation of the present invention are given below. In all the formulation examples, “smoothness during application”, “familiarity with skin”, and “emulsification stability” were good.
<Prescription Example 1 W / O Massage Cream>
[Oil phase]
(A) Compound 1 3.5% by mass
(I) Tri (capryl / capric acid) glyceride 3.0% by mass
(I) Beeswax 5.0% by mass
(U) Paraffin 3.0% by mass
(C) Microcrystalline wax 5.0% by mass
(U) Vaseline 15.0% by mass
(U) Liquid paraffin 40.0% by mass
Sorbitan monostearate 0.5% by mass
Polyoxyethylene (20 mol) sorbitan monostearate 0.5% by mass
Polyoxyethylene monostearate (75 mol) 1.0% by mass
Perfume appropriate amount [water phase]
(D) Water 19.1% by mass
1,2-hexylene glycol 1.0% by mass
1,3-butylene glycol
4.0% by mass
Preparation method An oil phase and an aqueous phase are dissolved by heating at 70 to 80 ° C, respectively. While stirring at 5000 rpm using a homogenizer at the same temperature, the water phase was gradually added to the oil phase and stirred at 5000 rpm for 10 minutes. Then, it cooled rapidly to 40 degrees C or less, and obtained the emulsion.

<Prescription Example 2 W / O Emollient Cream>
[Oil phase]
(A) Compound 2 2.0% by mass
(I) Cetyl 2-ethylhexanoate 3.0% by mass
(I) Olive oil 5.0% by mass
(I) Lanolin 6.0% by mass
(I) Beeswax 2.0% by mass
(U) Paraffin 2.0% by mass
(C) Microcrystalline wax 7.0% by mass
(U) Vaseline 3.0% by mass
(U) Squalane 35.0% by mass
Lipophilic glyceryl monostearate 0.5% by mass
Polyglyceryl-2 triisostearate 0.5% by mass
Polyoxyethylene (20 mol) sorbitan monostearate 1.0% by mass
Preservative
Appropriate amount Perfume Appropriate amount [Aqueous phase]
(D) 26.8% by mass of water
PEG # 1500 3.0% by mass
Propylene glycol 3.0% by mass
Preparation method An oil phase and an aqueous phase are dissolved by heating at 70 to 80 ° C, respectively. While stirring at 5000 rpm using a homogenizer at the same temperature, the water phase was gradually added to the oil phase and stirred at 5000 rpm for 10 minutes. Then, it cooled rapidly to 40 degrees C or less, and obtained the emulsion.

<Prescription Example 3 W / O Sunscreen Cream>
[Oil phase]
(A) Compound 1 3.0% by mass
(I) Tri (capryl / capric acid) glyceride 8.0% by mass
(U) Squalane 30.0% by mass
(C) Hydrogenated polyisobutene 2.5% by mass
Octyl paramethoxycinnamate 5.0% by mass
Hydrophobized titanium oxide 3.0% by mass
Organically modified montmorillonite 2.0% by mass
Preservative appropriate amount perfume appropriate amount [aqueous phase]
(D) Water 42.2% by mass
1,3-butylene glycol 4.0% by mass
Preparation method An oil phase and an aqueous phase are dissolved by heating at 70 to 80 ° C, respectively. While stirring at 10,000 rpm using a homogenizer at the same temperature, the water phase was gradually added to the oil phase and stirred at 10000 rpm for 30 minutes. Then, it cooled rapidly to 40 degrees C or less, and obtained the emulsion.

<Prescription Example 4 Emollient Oil Gel>
[Oil phase]
(A) Compound 5 10.0% by mass
(I) Tri (2-ethylhexanoic acid) glyceride 70.0% by mass
(U) Liquid paraffin 5.0% by mass
(C) Hydrogenated polyisobutene 5.0% by mass
Polyethylene glycol diisostearate (8 mol) 5.0% by mass
Preservative
Appropriate amount Perfume Appropriate amount [Aqueous phase]
(D) 3.8% by mass of water
Dipropylene glycol 1.0% by mass
Preparation method An oil phase and an aqueous phase are dissolved by heating at 70 to 80 ° C, respectively. While stirring at the same temperature, the aqueous phase was gradually added to the oil phase and stirred until uniform. Thereafter, it was cooled to obtain an emollient oil gel.
It was 4550 mPa * s when the viscosity in 25 degreeC of the formulation example 4 was measured with the E-type viscosity meter RE105U (rotor code No. 1, 100 rpm: Toki Sangyo Co., Ltd. product).

Claims (4)

A cosmetic base comprising a polyalkylene glycol derivative represented by the following formula (I).
Z- {O- (AO) _a- (EO) _k- (AO) _b -R} _m (I)

(In the formula, Z is a residue obtained by removing a hydroxyl group from a water-soluble polyhydric alcohol having 3 to 6 hydroxyl groups, m is 3 to 6, EO is an oxyethylene group, and AO is an oxyalkylene group having 4 to 8 carbon atoms. EO and AO are bonded in a block form.
a and b are the average addition mole number of AO, k is the average addition mole number of EO, a is 0 , b is 1 to 50, a + b is 1 to 50, k is 10 to 45 , (a + b + k) × m is it is 120-250. Further, the total amount of 100 parts by mass of the EO and AO, the mass ratio of EO is 40-75 parts by weight.
R represents a hydrogen atom or a fatty acid residue having 12 to 24 carbon atoms. )   The cosmetic base according to claim 1, wherein AO is a 1,2-oxybutylene group.   A cosmetic comprising the cosmetic base according to claim 1. Contains the following components (A), (I), (U), (E), the content of the component (A) relative to the total mass is 0.01 to 30% by mass, the components (A) and (U) The total amount of the component (a) is 10 to 95% by mass, the content of the component (e) is 1 to 70% by mass, and the amount of the component (a) is 10 parts by mass with respect to 100 parts by mass of the total amount of the components (a) and (c). A water-in-oil emulsified cosmetic that is at least part by mass.
(A) Base for cosmetics according to claim 1 or 2 (I) One or more polar oils selected from ester oils or triglycerides (U) Hydrocarbon oils (E) Water