JPH01113310A - Weak acidic oil-in-water type emulsified cosmetic - Google Patents

Abstract

PURPOSE:To obtain the titled cosmetic, containing a higher fatty acid salt, colloidal hydrous silicate and further a compound selected from aldonic acid and aldonolactone and having excellent usability and emulsion stability. CONSTITUTION:The titled cosmetic containing a higher fatty acid salt (preferably Na, K and triethanolamine salt) expressed by formula I (R is 11-21C straight-chain or branched alkyl or alkenyl; M is alkaline metal, ammonium, alkanolamine, etc.), a colloidal hydrous silicate (e.g. montmorillonite) and further one or two or more selected from aldonic acid (preferably gluconic acid) and aldonolactone (preferably glucono-delta-lactone) expressed by formula Il (n is >=3). This cosmetic is capable of exhibiting the same weak acidity as that of skin surface and simultaneously has excellent emulsion stability. The aldonic acid, etc., are preferably dissolved in water and added before previous emulsification from aspects of preventing smell from changing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a weakly acidic oil-in-water emulsion cosmetic, more specifically,
Usability containing aldonic acid or aldonolactone,
This invention relates to a weakly acidic oil-in-water emulsion cosmetic with excellent emulsion stability.

[Prior Art] Generally, it is said that it is preferable for skin cosmetics to be made weakly acidic because the surface of the skin is weakly acidic, and there has recently been a tendency for weakly acidic emulsified cosmetics to increase.

In addition, when considering ease of use, which is an important characteristic of skin cosmetics, the lack of stickiness found in oil-in-water emulsion cosmetics that combine higher fatty acid salts and colloidal hydrated silicates is very attractive. . Since both higher fatty acid salts and colloidal hydrated silicates are alkaline compounds, oil-in-water cosmetics that use these compounds in combination are inevitably alkaline, so conventionally they were used to make them weakly acidic. Acidic substances such as citric acid and lactic acid, which are commonly used in cosmetics, have been added. However, the addition of acidic substances such as citric acid and lactic acid has the disadvantage that emulsion stability deteriorates.

[Problems to be Solved by the Invention] In view of the above circumstances, the present inventors have developed an emulsified cosmetic containing a higher fatty acid salt and a colloidal hydrated silicate.
After extensive research into the possibility of obtaining something with excellent usability and emulsion stability, we have finally completed the present invention.

[Means for Solving the Problems] That is, the present invention provides a weakly acidic oil-in-water emulsion cosmetic containing a higher fatty acid salt and a colloidal hydrated silicate, which contains one or more of the group consisting of aldonic acid and aldonolactone. The present invention provides a weakly acidic oil-in-water emulsion cosmetic ↓ characterized by containing two types.

Hereinafter, the configuration of the present invention will be explained in detail.

The higher fatty acid salt used in the present invention is a compound represented by the following general formula (I).

R-COOM (I) (wherein, R is a linear or branched alkyl or alkenyl group having 11 to 21 carbon atoms, M is an alkali metal, ammonium, or ammonium substituted with an alkyl group having 1 to 5 carbon atoms. , is selected from the group consisting of alkanolamines having a hydroxyalkyl group having 2 to 3 carbon atoms and represents a counter ion.) Among the higher fatty acid salts used in the present invention, from the viewpoint of effectiveness, lauric acid, myristic acid, valmitic acid, Preferred are sodium, potassium and triethanolamine salts of straight chain fatty acids such as stearic acid and behenic acid, unsaturated fatty acids such as oleic acid, and branched fatty acids such as isostearic acid.

One or more kinds of higher fatty acid salts used in the present invention are appropriately selected and blended.

The higher fatty acid salts used in the present invention can be produced either by blending those produced outside the system or by individually blending the fatty acids and basic substances into the system to produce higher fatty acid salts in the system. However, the latter method of in-situ production is preferred.

The colloidal hydrated silicate used in the present invention includes:
Montmorillonite, Bentonite, Veegum series (
Natural colloidal hydrated silicates such as Vanderb I II) and Kunivia series (Kunimine Industries), synthetic colloidal hydrated silicates such as Laponite series (Laporte) and Smectone series (Kunimine Industries), and the above compounds. Examples include organic modified products of.

One or more of these are appropriately selected and blended.

Colloidal hydrous silicates are generally used as thickeners and contribute to improving emulsion stability. This type of thickener differs from other types of thickeners such as carboxyvinyl polymers in that it is less sticky and cannot coexist with powder.

Examples of the aldonic acids used in the present invention include compounds represented by the following general formula (II). Compounds are preferred, particularly gluconic acid.

HOH2C(CHOH)nCO○H(II) (in the formula, n
is 3 or more) In addition, as the aldonolactone used in the present invention,
Lactones of the compound represented by the above general formula (II) may be mentioned, but glucono-δ-lactone is preferred from the viewpoint of easy availability and price.

One or more kinds of aldonic acids or aldonolactones used in the present invention can be appropriately selected and blended.

The amounts of aldonic acid and aldonolactone are necessary to make the system weakly acidic, and therefore vary depending on the system.

The aldonic acid or aldonolactone used in the present invention is preferably dissolved in water and added after preliminary emulsification from the viewpoint of preventing odor.

In addition to the above-mentioned essential ingredients, the oil-in-water emulsion cosmetic of the present invention includes ultraviolet absorbers, drugs, oils, nonionic surfactants,
Components known for use in cosmetics, such as thickeners, fragrances, antibacterial agents, dyes, and pigments, can be added as necessary.

The oil-in-water emulsion cosmetic of the present invention can be in various forms, such as vanishing cream, milky lotion, cold cream, cleansing cream, hair cream, foundation cream, hand cream, and the like.

[Effects of the Invention] The present invention provides an oil-in-water emulsion cosmetic containing a higher fatty acid salt and a colloidal hydrated silicate, by incorporating aldonic acid or aldonolactone, thereby improving usability,
It has excellent emulsion stability and is weakly acidic.

[Example] The invention will now be explained in more detail by way of examples.

The present invention is not limited to these. The blending amount is in weight%.

Example 1, Comparative Example 1 An oil-in-water emulsified cosmetic having the formulation shown in Table 1 below was prepared, and the average particle size of the emulsified particles, pH 140°C
The emulsion stability after 1 month and the usability (less stickiness) were examined by expert panelists. The results are shown in Table 2.

(Margin below) Table 1 (Production method) Aqueous phase 1 was heated at 70 to 80°C, treated with a homomixer, and then triethanolamine was added and stirred. Add the dissolved oil phase and fragrance by heating at 70 to 80°C with stirring, stir and emulsify, and after adding the aqueous phase 2: - Treat with a homomixer and cool to 30°C.

As shown in Table 2, the oil-in-water emulsion cosmetic of the present invention was excellent in usability and emulsion stability, and was weakly acidic. On the other hand, the comparative product was weakly acidic and difficult to use, but had problems with emulsion stability.

Example 2, Comparative Example 2 An oil-in-water emulsified cosmetic having the formulation shown in Table 3 below was prepared, and the average particle size of the emulsified particles was: , pH, 4
The emulsion stability after 1 month at 0°C and usability (less stickiness) were investigated by expert panelists. The results are shown in Table 4.

(Margins below) (Production method of Example 2) Aqueous phase 1 and Veegum HV are heated at 70 to 80°C and treated with a homomixer. The powder is added to this, treated with a homomixer, and then an aqueous sodium hydroxide solution is added and stirred. The oil phase and fragrance dissolved by heating at 70 to 80°C are added to this while stirring, and emulsified by stirring. After adding the aqueous phase 2, the mixture is treated with a homomixer and cooled to 30°C.

(Production method of Comparative Example 2) After heating the aqueous phase 1 and the powder at 70 to 80°C and subjecting them to a homomixer treatment, an aqueous sodium hydroxide solution is added and stirred. The oil phase and fragrance dissolved by heating at 70 to 80°C are added to this while stirring, and the mixture is stirred and emulsified. After adding Ker Ice Ball 941 aqueous solution and water phase 2, it is treated with a homomixer and cooled to 30°C.

(Hereinafter, blank spaces) Table 4 As shown in Table 4, the oil-in-water emulsion cosmetic of the present invention was excellent in usability and emulsion stability, and was weakly acidic. On the other hand, although the comparative amount was weakly acidic, it had problems in emulsion stability and usability.

Example 3, Comparative Example 3 An oil-in-water emulsified cosmetic having the composition shown in Table 5 below was prepared, and the emulsified particles had a large average particle size, pH, and 40°C.
The emulsion stability after 1 month and the usability (less stickiness) were examined by expert panelists. The results are shown in Table 6.

(Manufacturing method) Water phase 1 is heated at 70 to 80°C, treated with a homomixer, powder is added thereto, and the mixture is treated with a homomixer again, and an aqueous potassium hydroxide solution is added and stirred. Add this to 70 to 80 ml while stirring.
The oil phase and fragrance dissolved by heating at 0°C are added and stirred to emulsify, and after adding the aqueous phase 2, the mixture is treated with a homomixer and cooled to 30°C.

As shown in Table 6, the oil-in-water emulsion cosmetic of the present invention was excellent in usability and emulsion stability, and was weakly acidic. On the other hand, although the comparative amount was weakly acidic, it had problems in emulsion stability and usability.

Patent applicant: Shiseido Co., Ltd. Procedural amendment (voluntary) July 21, 1988 Director General of the Patent Office Kunio Ogawa 1, Indication of the case 1988 Patent Application No. 272088 2, Name of the invention Weakly acidic oil-in-water type Emulsified cosmetics 3, relationship to the case of the person making the amendment Patent applicant address: 7-5-5, Ginza, Chuo-ku, Tokyo Contents of the amendment (1) 7th line from the bottom of page 2 of the specification , delete.

(2) Line 1 from the bottom of page 3 of the specification. ``Yo'' can be cited as ``Yo''.

(3) Add ``Yo'' next to ``R Selected'' on page 4, line 1 of the specification.

(4) From the bottom of page 8 of the specification, add "sodium" next to cellulose 1 on line 6.

(5) Page 14, line 8 of the specification, ``behenic acid'' is corrected to ``behenic acid''.

＞Komiou

Claims (3)

[Claims] (1) A weakly acidic oil-in-water emulsified cosmetic containing a higher fatty acid salt and a colloidal hydrated silicate, which is characterized by containing one or two of the group consisting of aldonic acid and aldonolactone. Oil-in-water emulsion cosmetic. (2) The weakly acidic oil-in-water emulsion cosmetic according to claim 1, wherein the aldonic acid is gluconic acid. (3) The weakly acidic oil-in-water emulsion cosmetic according to claim 1, wherein the aldonolactone is glucono-δ-lactone.