JPS5824325A - Oil-in-water type emulsified composition - Google Patents

Abstract

PURPOSE:To obtain an emulsified compsn. having good stability and ease of use by using an emulsifier making combination use of nonionic surfactants with higher fatty acid soap and adding an acid thereto. CONSTITUTION:The system emulsified with the emulsifier consisting of the soap of RCOOM (where R= an alkyl group or alkenyl group originating in fatty acids of 11-30 carbon numbers, M= alkali metals, triethanolamine, etc.) using higher fatty acids such as lauric acid, myristic acid or the like, nonionic hydrophilic surfactants of >=6 HLB such as polyoxyethylene higher alcohol ether and nonionic oil soluble surfactants of <=6 HLB such as glycerol monofatty acid ester is adjusted with acids to 4-7.4pH. Thus the oil-in-water type emulsifier having weakly acidic pH, good stability with time and an excellent effect upon the skin is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil-in-water emulsion composition having a slightly acidic pH, good stability over time, and excellent effects on the skin.

Conventionally, a bare emulsion composition has been made as an emulsifier by combining a stone residue obtained by reaction emulsification of a higher fatty acid and a basic substance and a nonionic lipophilic surfactant. At this time, since the basic substance used is strongly alkaline, the resulting emulsified composition has an alkaline pH of 8 to 10.

Recently, from the perspective of dermatology, it has been said that it is preferable for the pH of cosmetics to match the skin's H range of about 50 to 65. Therefore, it is said that it is desirable for the pH of cosmetics to be weakly acidic, and the number of weakly acidic cosmetics is increasing. There is a tendency to

Therefore, efforts have been made to lower the pH by reducing the amount of basic substances in conventional emulsified emulsion compositions, but it has been difficult to bring the pH to an acidic range. A product with acidic PL4 is a nonionic emulsion composition produced using a nonionic surfactant of 1,000 sulfur oxide adduct.

However, this nonionic emulsion composition is inferior to the bare emulsion composition in terms of usability such as familiarity with the skin and heavy feeling.

On the other hand, the higher fatty acid residue that gives the feeling of use of this naturalized emulsion composition varies somewhat depending on the type of fatty acid and basic substance that constitutes it, but when the pH is made acidic, the stone residue is hydrolyzed. - Decomposes into fatty acids and basic substances. As a result, the emulsification of the system is destroyed, the stability is deteriorated, and crystals caused by fatty acids such as separation or lumps (solid matter) and luster (shininess based on needle-like crystals) are generated, and in the raw emulsion composition, pl.
(It was difficult to make it acidic.

Therefore, the pH of emulsification with only the nonionic surfactant
One possible method is to add a higher fatty acid that gives a feeling of use to an acidic nonionic emulsified composition system and emulsify it. However, even in this method, if the amount of higher fatty acids added is 0.5% or more, at which the usability of higher fatty acids can be achieved, precipitation of higher fatty acids will occur. Addition of less than 0.05% is effective for threads with low viscosity such as emulsions, which give a somewhat sticky feel and improve blending, but it is difficult to make the emulsion particles thinner and stabilize the system. there were.

(Left below) In view of the current situation, the inventors of the present invention conducted intensive research to suppress the pH of the above-mentioned chemical emulsion composition.
By using an emulsifier consisting of a combination of a certain type of nonionic surfactant and a higher fatty acid, and adding an acid to lower the pH, the stability of the system will be close to the pH range of the skin. It was discovered that a good emulsified composition with excellent usability can be obtained, and the present invention was completed.

That is, the present invention has the general formula: RcooM (R is 1 carbon number
an alkyl group or alkenyl group derived from a fatty acid of 1 to 3, M represents an alkali metal, triethanolamine, or a basic amino acid); It is characterized by
It is an oil-in-water emulsion composition.

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

The higher fatty acid used in the present invention has the general formula RO
R in OOM is a higher fatty acid residue having 11 to 30 carbon atoms.

Higher fatty acids include lauric acid, myristic acid, noglumitic acid, stearic acid, Jl oleic acid, isostearic acid, hehenic acid, cerothiuric acid, lanolinic acid, etc., but preferred are those with ease of use. From this point of view, it is better to use solid fatty acids such as stearic acid.

In addition, basic substances used in the stone residue include hydroxides such as sodium hydroxide and potassium hydroxide, basic amino acids, and amines represented by triethylamine. Note that it is naturally possible and good to combine two or more of these higher fatty acids and basic substances;
・The amount of these basic substances added is preferably 0.5 to 1 in molar ratio to the higher fatty acid. Although the higher fatty acid may be added as a salt from the beginning, reaction emulsification is usually used.

If it is less than 0.01%, it is not sufficient to emulsify the system, and if it is more than w%', fatty acids will precipitate and the appearance of the surface will be poor.

It gives a solid feel in terms of usability and improves the stability of the system (hereinafter referred to as white).Next, as a nonionic hydrophilic surfactant with an HLB of 6 or higher, polyoxypropylene (hereinafter abbreviated as POE) higher alcohol ether is used. , POE higher fatty acid ester, POE
Sorbitan fatty acid ester, POE polyhydric alcohol fatty acid ester represented by glycerin fatty acid ester, PQE glycerin higher alcohol ether/PO
E-hardened castor? +h m conductor, sucrose fatty acid ester, PO, E sterolumi S form.

POEPOF, (polyoxypropylene) high grade Alpha 2.蓓 か（＊、、がる。Also, HLB6
Examples of nonionic lipophilic surfactants below include glycepolyglycerin fatty acid esters, hydrogenated castor oil derivatives,
Examples include sucrose fatty acid ester, sorbitan fatty acid ester, and sterol derivatives.

The amount of these nonionic surfactants added can be adjusted to a high grade level.

1゜Here, HI, 'B (lipophilicity,
There are various calculation methods for the hydrophilic and hydrophilic balance), and the resulting HI; Based on the calculation method.In the present invention, a nonionic hydrophilic surfactant with an HLB of 6 or more calculated by the above method and a HL
The nonionic lipophilic surfactant of less than B6 is adjusted to the optimum HLB of the system required depending on the amount and type of oil contained.・By adjusting the HLB of added ethylene oxide, etc.
Of course, it is also possible to use them alone.

In the present invention, organic acids added as pH adjusters include oxyacids, lower carboxylic acids, acidic amino acids, and the like. Examples of oxyacids include lactic acid, malic acid, tartaric acid, citric acid, etc., and relatively low molecular weight 9oxyacids such as these examples are preferred. Among the lower carboxylic acids, dibasic acids are preferred, such as ciparaginic acid and urocanic acid.

Examples of inorganic acids include hydrochloric acid, carbonic acid, phosphoric acid, and silicic acid.

Any other acid used in cosmetics can be used, and these can be used alone or in combination.・They are added in an amount such that p[1 of the system of the emulsified composition is 40 to 74. .

(Left below) Aqueous components added to the emulsified composition include lower alcohols, polyhydric alcohols such as pyrene glycol, glycerin, and polyethylene glycol, moisturizing agents such as sodium pyrrolidone carboxylate and amino acids, and oil-based components. For example, hydrocarbons such as liquid halafine, petrolatum/paraffin wax, squalane, esters such as beeswax, lanolin, jojoba oil, synthetic oils of higher alcohols and fatty acids, higher alcohols, alcohols such as lamelin alcohol, and olive oil. and triglycerides such as shortening oil.

Next, the effects of the present invention will be described.

Table 1 shows the emulsified composition according to the present invention, Comparative Example 1.2 which is a conventional raw emulsified composition prepared by adding acid to adjust pl+, and Comparative Example 3 which is a non-ionic emulsified composition. This is a comparison of physical properties such as pH 1 emulsified particles and stability for those to which fatty acids were added. Stability is 40
The results were compared after being left at °C for 7 days and at OoC for 1 month.

Table 1 Stability evaluation ○ Good × Bad Δ
Fairly bad xx Very bad As is clear from Table 1, the emulsion composition according to the present invention had good stability and fine emulsion particles.

(Margin below) Next, examples of the present invention will be shown.

Example 1 Cream■ Ihe=2 acid 4%■ Setanol 20 Piece wax 2■ Vaseline
2■ Squalane
4゜■ Propylene glycol monostearate 1■ POE (5 mol)
Glycerin monostearate 1～■
POE (60 mol) hydrogenated castor oil derivative
1 ■ Fragrance
Appropriate amount [Phase] Paraoxyamphoic acid methyl ester o2 ■ Tofuferol 001 @ Glycerin
10q of potassium hydroxide
020 Ion exchange water
3479■ Hydrochloric acid (l N )
1.8 Manufacturing method Heat and dissolve ① to ② at 70 to 75°C. Separately, heat and dissolve @~■ at 70~75°C, and while continuing to stir,
~■ is added to react and emulsify. Next, add [phase] and p
By adjusting H and processing with an emulsifying machine, an oil-in-water cream with fine and uniform emulsified particles can be obtained. This emulsified composition is p
It is an oil-based nutritional cream with an H value of 56 and excellent usability.

Example 2 Emulsion % ■ Stearic acid ] ■ Isostearic acid l ■ Setanol
o5■ Stearyl alcohol o5■ Vaseline
2■ Squalane
10■ Glycerin monooleate 1■
Glycerin monostearyl ether 1■ Fragrance
Applicable 6Φ1 so 7'plZ') L/Mekel 7S/
ノ)V o1■ Vitamin E acetate Q,05■ Propylene glycol 5■ Triethanolamine 1■ Ion exchange water
7545 [Phase] Carboxyvinyl polymer 010 Citric acid
03 Manufacturing method The manufacturing method of Example 1 was followed.

This emulsion composition is a stable emulsion with a pH of 72.

Example 3 F7 undation% ■ Stearic acid 1 ■ Dimer acid 1 ■ Ole,yl alcohol 05 ■ Liquid paraffin
10 ■ Sorbitan sesquiolate 1 ■ p OE (10 mol) behenyl alcohol ether 5 ■ Fragrance
Appropriate amount■
Paraoquin benzoic acid butyl ester O1■
Butylated hydroxytoluene 0.001
Cψ Propylene glycol 50■
Sodium hydroxide 005e L
-Arginine 050 Xanthan gum 0.05 ■ Montmorillonite 05 [Phase] Ion exchange water
to, f'1 [Phase] Inorganic pigments (titanium oxide, tar, kaolin, 75'' Manufacturing method ■ ~ ■ are heated and dissolved and adjusted to 70 ~ 75 ° C. On the other hand, [Phase] ~ O is similarly Dissolve the pigment by heating at 70-75°C and uniformly disperse and mix the pigment.
Add ■ to react and emulsify O After this, add [stock]
] If you adjust L, tepl( and process it with an emulsifying machine,
A small and uniform emulsification of emulsified particles)
Scream.

The pH of this emulsified composition is 68.

Patent applicant: Seido Co., Ltd. Procedural amendment ゛11Ji5, 1981 1. Displaying 1s items 1981 Patent Application No. 122704 a Name of the invention Oil-in-water emulsion composition 3. When using supplementary IF 4 Date of arrest order Self-originated 5 Target of correction Detailed description of the invention in the detailed description 6 Capture II This content

Claims (1)

[Claims] (R) General formula: ROOOM (R = number of carbon atoms u -30
77) a sulfalkyl group or alkenyl group derived from a fatty acid,
M buffalkali metal, triethanolamine, or basic amino acid)
Nonionic hydrophilic surfactant with HLB of 6 or higher and HLB
A system emulsified with an emulsifier consisting of a nonionic oil-soluble surfactant of less than
74. An oil-in-water emulsion composition characterized in that the composition is adjusted to 74. (2) Higher fatty acids Ishiyo's higher fatty acids are lauric acid and
The oil-in-water emulsion composition according to claim 1, which is selected from the group of myristic acid, palmitic acid, stearic acid, oleic acid, isostearic acid, behenic acid and lanolic acid. (3) A nonionic hydrophilic surfactant with an HLB of 6 or more,
The water according to claim 1 selected from the group of polyoxyethylene higher alcohol ether, polyoxyethylene glycerin monofatty acid ester 1, polyoxyethylene hydrogenated castor oil derivative, sucrose, fatty acid ester, and polyoxyethylene sterol derivative. Oil type emulsion composition. (4) A nonionic lipophilic surfactant with an HLE of less than 6,
The oil-in-water emulsion composition according to claim 1, which is selected from the group of glycerin monofatty acid ester, propylene glyfur monofatty acid ester, glycerin monohigher alcohol ether/hardened castor oil derivative, sucrose fatty acid ester, and sterol derivative. . (5) p)! The organic acid that adjusts the
The oil-in-water emulsion composition according to claim 1, which is one or more types. (6) The oil-in-water emulsion composition according to claim 1, wherein the inorganic acid for adjusting pH is one or more of hydrochloric acid, carbonic acid, phosphoric acid, or silicic acid.