JP3355257B2 - Cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Generally, polyglycerin fatty acid esters are widely used as additives in foods, cosmetics and the like, utilizing various properties thereof.

[0002]

2. Description of the Related Art Cosmetics cleanse and moisturize the skin,
It is desirable to form an oily film having air permeability that does not hinder skin respiration, and to be safe and have a role of keeping skin and hair healthy. In order to obtain cosmetics having such properties, the oil phase component, which is the main component, is less irritating, has no color or odor, has a good affinity with other components, and has properties on the skin surface and physiological effects. It is necessary to have a good feel and a viscosity suitable for the purpose without affecting. Oil phase components conventionally used in cosmetics are mainly natural animal and vegetable oils and fats,
Wax and mineral hydrocarbons. However, the quality and price of natural products fluctuate, and even if a sophisticated purification process is performed, the quality may deteriorate over time (hue, odor, etc.), which is not desirable. Mineral substances are chemically inert, stable in quality, and inexpensive, but have a strong oily feeling and have poor skin properties if there is a defect in the purification process. There are drawbacks. In addition, these oil phase components may have a problem in affinity with other additives (such as fragrances and pigments). Therefore, a medium-chain fatty acid triglyceride (MCT: Medium Cha) obtained by completely esterifying glycerin with caprylic acid or capric acid or a mixed fatty acid thereof.
in Triglyceride) is used. The average degree of polymerization is 4
One or two polyglycerol fatty acid esters obtained by esterifying the above polyglycerin with a mixed fatty acid of a higher fatty acid having 14 or more carbon atoms and a lower fatty acid having 2 to 4 carbon atoms.
Japanese Patent Application Laid-Open No. 58-7251 for cosmetics containing more than one kind
No. 0.

[0003]

However, since glycerin has a low molecular weight and low viscosity, MCT itself has almost no viscosity. In addition, glycerin has a small number of hydroxyl groups and cannot provide a large range of change in polarity, and glycerin has a lower viscosity than diglycerin and triglycerin. It will be limited. Polyglycerin is obtained by separating low-boiling substances from the heat polymerization product of glycerin, if necessary, at 260 to 280 ° C. using sodium hydroxide or the like as a catalyst during heat polymerization.
It is obtained by reacting at a high temperature for a long time, and therefore contains a large amount of high-boiling non-separable by-products. With the increase in the degree of polymerization, these polyglycerins increase in viscosity and boiling point and deteriorate the hue, so that purification becomes difficult and only low-boiling substances such as glycerin, diglycerin and triglycerin can be purified. The higher the molecular weight, the higher the cost of purification, and the cost of polyglycerin fatty acid esters using polyglycerin with a high degree of polymerization remains problematic. Further, polyglycerin having a high degree of polymerization has a poor feel and is not suitable for an oil phase component. In addition, carbon number 14
When the higher fatty acids described above are used for esterification, they have a strong oily feeling and a grease-like feel, resulting in poor usability.
Further, when an unsaturated substance is used, the stability of oxidation to heat, light, and metal ions is poor, and a peroxide is likely to be generated. When only lower fatty acids are used for the esterification, the polarity of the ester itself becomes too strong, so that the compatibility with the oil phase component deteriorates.

[0004]

Means for Solving the Problems The present invention has been intensively researched and developed for the purpose of providing an inexpensive cosmetic which has high safety and excellent functions and whose quality does not deteriorate over time. The invention has been reached. That is, the present invention provides a diglycerin fatty acid ester comprising a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof and / or a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof. Is a cosmetic comprising one or more triglycerin fatty acid esters having the following constituent fatty acids. Diglycerin fatty acid ester and / or carbon obtained by esterifying 20% or more of the hydroxyl groups of diglycerin (esterification degree: 20% or more) with a linear medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof. Number 6-1
(4) Either one or two or more triglycerin fatty acid esters obtained by esterifying 20% or more of the hydroxyl groups of diglycerin (esterification degree: 20% or more) with a straight-chain medium-chain saturated fatty acid or a mixed fatty acid thereof. It may be a cosmetic containing the same. Preferably, 80% or more of the hydroxyl groups of diglycerin is esterified with a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof (degree of esterification: 80% or more).
Of 80% or more of the hydroxyl groups of triglycerin (esterification degree: 80% or more) with diglycerin fatty acid ester and / or a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof. And at least one of triglycerin fatty acid esters obtained by the above method, and more preferably a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof. Diglycerol fatty acid ester (esterification degree: 80% or more) obtained by esterifying 20% or more of the hydroxyl groups of the remaining diglycerin with a lower fatty acid having 2 to 4 carbon atoms to form at least 80% of the hydroxyl groups, and 6 carbon atoms.
20% or more of the hydroxyl groups of triglycerin are esterified with a straight-chain medium-chain saturated fatty acid or a mixed fatty acid of 14 to 14, and 80% or more of the hydroxyl groups of the remaining triglycerin are esterified with a lower fatty acid having 2 to 4 carbon atoms. Triglycerin fatty acid ester (degree of esterification: 80%
Or a cosmetic comprising at least one of the above.

[0005] The medium-chain saturated fatty acid used in the present invention is a straight-chain fatty acid having 6 to 14 carbon atoms, preferably having 8 to 1 carbon atoms.
4 straight-chain fatty acids, more preferably 8,1 carbon atoms.
0,12,14 straight-chain fatty acids. For example, caproic acid, heptyl acid, caprylic acid, nonylic acid, capric acid,
Undecanoic acid, lauric acid, myristic acid and the like are preferable, and a hydrolyzate of coconut oil or palm oil or a hydrogenated product thereof can also be exemplified. These may contain palmitic acid, stearic acid, or oleic acid in a very small amount depending on the degree of purification, but there is no problem in use. These medium-chain saturated fatty acids may be used alone or in combination.
A combination of more than one species may be used. The lower fatty acid having 2 to 4 carbon atoms used in the present invention is one or a mixture of two or more of acetic acid, propionic acid and butyric acid. Furthermore, some medium-chain saturated fatty acids have a bactericidal action, and esters composed of such fatty acids also have a bactericidal or bacteriostatic action per se, to clean cosmetics and applied skin surfaces. Keep,
A mixed ester of a lower fatty acid and a medium-chain saturated fatty acid has the same property as an oily base as the medium-chain saturated fatty acid ester. When a side chain fatty acid is used as the medium chain saturated fatty acid, the ester also has a skin irritating property due to the skin irritating property of the side chain fatty acid, which is not preferable for use.

In the present invention, diglycerin fatty acid ester and triglycerin fatty acid ester are produced by direct esterification of diglycerin (or triglycerin) with fatty acid, reaction of diglycerin (or triglycerin) sodium alkoxide with fatty acid chloride. The diglycerin fatty acid ester and the triglycerin fatty acid ester of the present invention can be obtained by any production method. For example, diglycerin tetralaurate can be synthesized as follows. That is, a four-necked flask equipped with a thermometer, a nitrogen inlet tube and a water separation trap was charged with diglycerin and lauric acid at a molar ratio of 1: 4 (diglycerin: lauric acid = 1: 4), and 85% After adding 0.05% of the total amount of the phosphoric acid aqueous solution, 250 ° C. in a nitrogen stream
For 3 hours. The diglycerin fatty acid ester of the present invention thus obtained and the triglycerin fatty acid ester are very stable and have little skin sensitization, and are white to pale yellow liquid or soft solid at room temperature and have spreadability. And its melting point, viscosity, etc. can be adjusted by the type and amount of the constituent fatty acids. Furthermore, these fatty acid esters have good affinity with other oil phase components and are useful as an admixture or a lubricant when used in an emulsification system.

[0007] That is, cosmetics containing these fatty acid esters according to the present invention have little change in viscosity (viscosity) with respect to temperature changes in summer and winter. There is no problem with affinity and stability with other additives (pigments, preservatives, perfumes, etc.) as well as general oil phase components. Examples of the diglycerin fatty acid ester and triglycerin fatty acid ester of the present invention include surfactants such as triethanolamine salts, alkylammonium salts, alkylpyridium salts, sodium lauryl sulfate, lauromacrogol, magnesium sulfate, aluminum sulfate, and magnesium oxide. , Zinc oxide and other inorganic salts, castor oil, olive oil, cottonseed oil, egg yolk oil, mink oil, cocoa butter, wax and other oils and fats,
Or waxes such as beeswax, lanolin, carnauba wax, candelilla wax and montan wax, and further monovalent such as lauryl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, cholerin, sitosterin, lanolin alcohol. Or polyvalent alcohols, phenol
, Resorcinol, orthophenylphenol, paraoxybenzoic acid esters, cresol, benzoic acid and its salts, salicylic acid and its salts, benzethonium chloride, ethylene oxide, and other antibacterial agents, preservatives or jelly, cinnamon bark oil , Orange oil, benzyl alcohol-
No problem is recognized even when used in combination with natural or synthetic fragrances such as toluene, camphor and eugenol. Therefore, the diglycerin fatty acid ester and triglycerin fatty acid ester of the present invention exhibit excellent functions when used as a cosmetic base such as foundation, lipstick, and emulsion.

[0008] In preparing the diglycerin fatty acid ester and triglycerin fatty acid ester of the present invention, the degree of esterification with medium-chain saturated fatty acids is at least 20% of the total of diglycerin and triglycerin (degree of esterification: 20% or more). Desirably. If the value is smaller than this value, the polarity becomes high and the compatibility with the oil phase component decreases. The degree of esterification in the present application means the ester value (A) when polyglycerin is esterified with a fatty acid in an amount necessary and sufficient to theoretically completely esterify the polyglycerin, and the esterification degree with a certain amount of the fatty acid. The degree of esterification (%) was calculated from the ester value (B) in this case by B / A × 100.
The ester value may be a value measured by any known method. Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

[0009]

【Example】

Example 1 332 g of diglycerin in a two-liter four-necked flask
(2.0 mol), 1152 g of caprylic acid (8.0 mol,
After adding 8% of carbon atoms and adding 0.1% of the total amount of sodium hydroxide, the mixture was reacted at 220 ° C. for 3 hours while removing water under a nitrogen stream to obtain an ester (esterification degree: 100%). Example 2 A lipstick was prepared using the ester of Example 1 (diglycerin tetracaprylate). The numbers are parts by weight. Ester of Example 1 Castor oil 75.0 Pigment 10.0 Fragrance 2.0 Carnauba wax 3.0

Comparative Example 1 Lipstick was prepared using glycerin fatty acid ester (glycerin tri-2-caprylate) (degree of esterification: 100%). The numbers are parts by weight. Glycerin fatty acid ester 10.0 Castor oil 75.0 Pigment 10.0 Fragrance 2.0 Carnauba wax 3.0 Comparative Example 2 Lipstick using polyglycerin fatty acid ester (decaglycerin tricaprylate) (esterification degree: 25%) Was prepared. The numbers are parts by weight. Polyglycerin fatty acid ester 10.0 Castor oil 75.0 Pigment 10.0 Fragrance 2.0 Carnauba wax 3.0 Test example 1 Table 1 shows the effect measurement results of Example 2 and Comparative examples 1 and 2.

[0011]

[Table 1]

(Test Method) 1: Consistency The sensory evaluation was carried out by a practical use test by a panel of 25 girls aged 19 to 57 years. The evaluation was performed in the following five-step evaluation. A: Very good D: Not good B: Somewhat good C: Normal E: Not very good 2: Spreadability Same as for consistency 3: Colored (persistence) Same as for consistency 4 : Irritability to lips Same as consistency 5: Abnormal lips Same as consistency 6: Storage stability After the adjusted sample was left at 25 ° C for one month, A: No change B: Hardening or softening Example 3 240 g of triglycerin in a two-liter four-necked flask
(1.0 mol), 438 g (3.0 mol, carbon number 8) of caprylic acid and 456 g (2.0 mol, carbon number 14) of myristic acid, and after adding 0.1% of the total amount of sodium hydroxide, a nitrogen stream was added. 2. Under water at 240 ° C. while removing water.
The reaction was carried out for 5 hours to obtain an ester (esterification degree: 100%). Example 4 480 g of triglycerin in a two-liter four-necked flask
(2.0 mol), 684 g of myristic acid (3.0 mol,
After charging carbon number 14) and adding 0.05% of the total amount of anhydrous sodium acetate, 21.
React at 0 ° C for 3 hours to ester (esterification degree: 30%)
I got Example 5 An emulsion was prepared using the ester of Example 3. The numbers are parts by weight. Ester of Example 3 5.0 Olive oil 43.0 Purified water 51.5 Perfume 0.5 Perfume is mixed and melted in oily component, kept at 70 ° C, purified water is added, mixed at 70 ° C, and homomixed. And cooled to 30 ° C. while stirring.

Example 6 An emollient was prepared using the esters of Examples 1 and 4. The numbers are parts by weight. (1) Ester of Example 1 7.0 Stearic acid 2.0 Cetanol 1.0 Lanolin 2.0 Squalane 9.0 Ester of Example 4 3.0 Preservative 0.5 (2) Purified water 56. 0 Triethanolamine 1.0 Sorbitol 3.0 (3) Titanium oxide 7.5 Kaolin 4.5 Talc 2.0 (4) Fragrance 1.5 Disperse pigment (3) in aqueous phase (2), Add oil phase (1) and emulsify to mix (4).

Comparative Example 3 An emulsion was prepared using triglycerin fatty acid ester (triglycerin pentapropionate, degree of esterification: 100%). The numbers are parts by weight. Triglycerin fatty acid ester 5.0 Olive oil 43.0 Purified water 51.5 Fragrance 0.5 Comparative Example 4 Emulsion using triglycerin fatty acid ester (triglycerin pentastearate (degree of esterification: 100%)) Was prepared. The numbers are parts by weight. Triglycerin fatty acid ester 5.0 Olive oil 43.0 Purified water 51.5 Fragrance 0.5

Comparative Example 5 Using commercially available MCT (glycerin tricaprate (esterification degree: 100%)) and polyglycerin fatty acid ester (hexaglycerin distearate (esterification degree: 35%)), emollients were prepared. Was prepared. The numbers are parts by weight. (1) MCT 3.0 stearic acid 2.0 cetanol 1.0 lanolin 2.0 squalane 9.0 hexaglycerin distearate 7.0 preservative 0.5 (2) purified water 56.0 triethanolamine 1.0 Sorbitol 3.0 (3) Titanium oxide 7.5 Kaolin 4.5 Talc 2.0 (4) Fragrance 1.5 Pigment (3) is dispersed in aqueous phase (2), and oil phase (1) ) And emulsify to mix with (4).

Comparative Example 6 A commercially available polyglycerin fatty acid ester (decaglycerin monostearate (degree of esterification: 10%);
An emollient was prepared using hexaglycerin distearate (degree of esterification: 35%). The numbers are parts by weight. (1) Decaglycerin monostearate 3.0 Stearic acid 2.0 Cetanol 1.0 Lanolin 2.0 Squalane 9.0 Hexaglycerin distearate 7.0 Preservative 0.5 (2) Purified water 56 0.0 Triethanolamine 1.0 Sorbitol 3.0 (3) Titanium oxide 7.5 Kaolin 4.5 Talc 2.0 (4) Fragrance 1.5 Pigment (3) is dispersed in aqueous phase (2). Add oil phase (1), emulsify and blend (4). Test Example 2 Table 2 shows the effect measurement results of Examples 5 and 6 and Comparative Examples 3, 4, 5, and 6.

[0017]

[Table 2]

(Test Method) 1: Skin stickiness Sensory evaluation was carried out by a practical use test using a panel of 25 girls aged 19 to 57 years. The evaluation was performed in the following five-step evaluation. A: Very good D: Not good B: Somewhat good E: Very bad C: Normal 2: Adaptation to skin Same as skin stickiness 3: Spreadability Same as skin stickiness 4: Skin moist feeling Same as skin stickiness 5: Skin irritation Same as skin stickiness Test Example 3 Effect measurement results of Examples 5, 6 and Comparative Examples 3, 4, 5, 6 Are shown in Table 3. (Test Method) The prepared sample was stored in a thermostat at 50 ° C., and its appearance was visually observed to test the emulsion stability. Evaluation,
The procedure was as follows. A: No separation is observed B: Slight separation is observed C: Complete separation is observed

[0019]

[Table 3]

Example 7 166 g of diglycerin was placed in a one-liter four-necked flask.
(1.0 mol) and 200 g (1.0 mol, carbon number 12) of lauric acid were charged under a nitrogen stream while removing water.
Ester by reacting at 0 ° C for 2 hours (esterification degree: 25%)
Was prepared and 228 g of propionic acid (3.
0 mol, having 3 carbon atoms), and then adding 0.05% of the total amount of anhydrous sodium acetate, followed by reacting at 210 ° C. for 3 hours while removing water under a nitrogen stream to obtain an ester (esterification degree: 1).
00%). Test Example 4 The ester of Example 7, commercially available MCT (glycerin tricaprate ester (degree of esterification: 100%)), commercially available polyglycerin fatty acid ester (PGE: decaglycerin monostearate (degree of esterification: 10
%)), Acid value (AV) during storage, peroxide value (P
Table 4 shows changes in OV). (Test Method) A fixed amount of each sample was placed in a glass bottle with a lid, and left at 60 ° C. and 80% humidity, and the acid value (AV) and the peroxide value (POV) were measured according to a standard method.

[0021]

[Table 4]

Example 8 166 g of diglycerin was placed in a 1-liter four-necked flask.
(1.0 mol), and 116 g (1.0 mol, carbon number 10) of caproic acid were charged, and the water was removed under a nitrogen stream while removing water.
The reaction was carried out at 10 ° C. for 1.5 hours (esterification: 2
5%), and 180 g of acetic acid (3.
0 mol, carbon number 2), 0.05% of the total amount of 85
% Phosphoric acid aqueous solution, and then reacted at 200 ° C. for 2 hours while removing water under a nitrogen stream to obtain an ester (degree of esterification: 1).
00%). Test Example 5 The ester of Example 8, commercially available MCT (glycerin tricaprate ester (degree of esterification: 100%)), commercially available polyglycerin fatty acid ester (PGE: decaglycerin monostearate (degree of esterification: 10
%)), A change due to a low temperature state was observed, and the results are shown in Table 5. (Test method) A fixed amount of each sample was placed in a glass bottle with a lid, and the storage was switched to -10 ° C after 120 hours of storage at -7 ° C. The evaluation was performed in the following four-step evaluation. A: No crystal B: Crystal floating on the surface C: Semi-solid state D: Completely solid state

[0023]

[Table 5]

The embodiments of the present invention and the desired products are as follows. (1) Cosmetics containing one or more diglycerin fatty acid esters and / or triglycerin fatty acid esters having a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof as a constituent fatty acid . (2) Cosmetics containing one or more diglycerin fatty acid esters and / or triglycerin fatty acid esters having a straight-chain medium-chain saturated fatty acid having 8 to 14 carbon atoms or a mixed fatty acid thereof as a constituent fatty acid . (3) It contains one or more diglycerin fatty acid esters and / or triglycerin fatty acid esters having a straight-chain medium-chain saturated fatty acid having 8, 10, 12, or 14 carbon atoms or a mixed fatty acid thereof as a constituent fatty acid. Makeup cosmetics. (4) Diglycerin fatty acid ester and / or triglycerin obtained by esterifying 20% or more of the hydroxyl groups with a linear medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof (degree of esterification: 20% or more). A cosmetic comprising one or more glycerin fatty acid esters. (5) Diglycerin fatty acid ester and / or triglycerin obtained by esterifying 40% or more of hydroxyl groups with a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof (degree of esterification: 40% or more). A cosmetic comprising one or more glycerin fatty acid esters.

(6) Diglycerin fatty acid esters obtained by esterifying 60% or more of the hydroxyl groups (degree of esterification: 60% or more) with a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof; And / or a cosmetic comprising one or more triglycerin fatty acid esters. (7) Diglycerin fatty acid ester and / or triester obtained by esterifying 80% or more of the hydroxyl groups with a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof (degree of esterification: 80% or more). A cosmetic comprising one or more glycerin fatty acid esters. (8) Diglycerin fatty acid ester and / or triglycerin obtained by esterification (degree of esterification: 20% or more) of 20% or more of hydroxyl groups with a straight-chain medium-chain saturated fatty acid having 8 to 14 carbon atoms or a mixed fatty acid thereof. A cosmetic comprising one or more glycerin fatty acid esters. (9) Diglycerin fatty acid ester and / or triglycerin obtained by esterifying 40% or more of hydroxyl groups with a straight-chain medium-chain saturated fatty acid having 8 to 14 carbon atoms or a mixed fatty acid thereof (degree of esterification: 40% or more). A cosmetic comprising one or more glycerin fatty acid esters. (10) Diglycerin fatty acid ester and / or triglycerin obtained by esterification (degree of esterification: 60% or more) of a hydroxyl group with a linear medium-chain saturated fatty acid having 8 to 14 carbon atoms or a mixed fatty acid thereof. A cosmetic comprising one or more glycerin fatty acid esters.

(11) Diglycerol fatty acid esters obtained by esterifying 80% or more of the hydroxyl groups with a straight-chain medium-chain saturated fatty acid having 8 to 14 carbon atoms or a mixed fatty acid thereof (degree of esterification: 80% or more); And / or a cosmetic comprising one or more triglycerin fatty acid esters. (12) Diglycerin fatty acid ester obtained by esterification (degree of esterification: 20% or more) of 20% or more of hydroxyl groups with a linear medium-chain saturated fatty acid having 8, 10, 12, or 14 carbon atoms or a mixed fatty acid thereof. And / or a cosmetic containing one or more triglycerin fatty acid esters. (13) Diglycerin fatty acid ester obtained by esterification (degree of esterification: 40% or more) of a hydroxyl group by 40% or more of a hydroxyl group with a straight-chain medium-chain saturated fatty acid having 8, 10, 12, or 14 carbon atoms or a mixed fatty acid thereof. And / or a cosmetic containing one or more triglycerin fatty acid esters. (14) Diglycerin fatty acid esters obtained by esterifying 60% or more of the hydroxyl groups (esterification degree: 60% or more) with straight-chain medium-chain saturated fatty acids having 8, 10, 12, or 14 carbon atoms or mixed fatty acids thereof. And / or a cosmetic containing one or more triglycerin fatty acid esters. (15) Diglycerin fatty acid ester obtained by esterifying 80% or more of hydroxyl groups (esterification degree: 80% or more) with a linear medium-chain saturated fatty acid having 8, 10, 12, or 14 carbon atoms or a mixed fatty acid thereof. And / or a cosmetic containing one or more triglycerin fatty acid esters. (16) 40% or more of the hydroxyl groups are esterified with a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof,
Diglycerin fatty acid ester and / or triglycerin fatty acid obtained by esterifying 80% or more of the remaining hydroxyl groups of diglycerin or triglycerin with a lower fatty acid having 2 to 4 carbon atoms (esterification degree: 80% or more) A cosmetic comprising one or more esters. (17) 40% or more of the hydroxyl groups are esterified with a straight-chain medium-chain saturated fatty acid having 8 to 14 carbon atoms or a mixed fatty acid thereof,
Diglycerin fatty acid ester and / or triglycerin fatty acid obtained by esterifying 80% or more of the remaining hydroxyl groups of diglycerin or triglycerin with a lower fatty acid having 2 to 4 carbon atoms (esterification degree: 80% or more) A cosmetic comprising one or more esters.

[0027]

As shown in the examples, the cosmetics of the present invention (diglycerin fatty acid ester, triglycerin fatty acid ester) are not only stable themselves, but also have a feeling of use when used in cosmetics. And the stability of itself is improved, so that it can be widely used as an oily component.

Claims (3)

(57) [Claims] 1. Diglycerin fatty acid ester comprising a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof and / or a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixture thereof. A triglycerin fatty acid ester having a fatty acid as a constituent fatty acid, wherein 80% or more of the hydroxyl groups are esterified by a linear medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof (degree of esterification: 80% or more). A cosmetic composition containing a fatty acid ester obtained by the above method. 2. The method according to claim 1, wherein at least 20% of the hydroxyl groups are esterified with a straight-chain medium-chain saturated fatty acid having 6 to 14 carbon atoms or a mixed fatty acid thereof, and the remaining hydroxyl groups of diglycerin or triglycerin are converted to lower fatty acids having 2 to 4 carbon atoms. A cosmetic composition containing a fatty acid ester obtained by esterifying 80% or more of the hydroxyl groups by the method (esterification degree: 80% or more). 3. A cosmetic comprising the cosmetic composition according to claim 1.