JPS59139920A - Emulsified composition - Google Patents

Abstract

PURPOSE:To improve the coating feeling, the stability with the elapse of time and the emulsifiability of an obtained emulsified composition, by using a fatty acid salt mixture containing three kinds or more of an Na or K salt of a higher straight chain saturated fatty acid and an Na or K salt of a higher fatty acid liquid at a room temp. in the total amount. CONSTITUTION:A mixture which contains one or more of a component selected from an Na or K salt of a 14-22C straight saturated fatty acid and one or more of a component selected from an Na or K salt of 14-22C fatty acid liquid at a room temp. and comprising three kinds or more of the above mentioned fatty acid salts in the total is compounded. This inventive oil in water type emulsified compositon is prepared by mixing and emulsifying the mixture comprising the above mentioned fatty acid salts, an oil component and water and is good in coating feeling to the skin, free from crystal precipitation, excellent in longterm stability and satisfactory emulsifiability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a higher fatty acid salt (soap) emulsion type emulsion composition. More specifically, the present invention relates to an improved higher fatty acid salt (soap) emulsion type emulsion composition that is less likely to cause crystals of higher fatty acids and higher fatty acid salts (soap) to precipitate over time and has good stability.

In general, higher fatty acid salts exhibit a thixotropic gel-like or core-gel-like form in an aqueous solution of 10 wt% or less, have a good feel when applied to the skin, and have good oil emulsifying properties, so they are used in cosmetics, pharmaceuticals, etc. It is useful as an emulsifier. In particular, salts with a weak base such as triethanolamine as a counter ion have a stable gel region extending around room temperature, have good stability over time, and have good emulsifying properties, so they have been widely used as emulsifiers. However, recently, questions have been raised regarding the safety of triethanolamine on the skin, and many attempts have been made to use sodium salts and potassium salts instead.

However, sodium salts or potassium salts of straight chain fatty acids having 14 or more carbon atoms have good emulsifying properties and are safe for the skin (no problem), but their Krafft point is above room temperature, and they do not form crystals at room temperature. One.

On the other hand, sodium salts or potassium salts of higher fatty acids, such as isostearic acid and oleic acid, which are liquid at room temperature, have a Krafft point lower than room temperature, but do not produce a viscous gel and have poor emulsifying properties.

For this reason, conventionally, when sodium or potassium salts of higher fatty acids are used as emulsifiers, linear fatty acid salts with good emulsifying properties are used, and surfactants such as fatty acid monoglycerides are added to these to suppress crystal precipitation. However, it is difficult to suppress crystal precipitation for a long period of time even with this method.Also, liquid fatty acid salts have poor emulsifying properties, so they are rarely used as emulsifiers. However, only a few examples of its use as a viscosity modifier for emulsion systems are known.

In view of these circumstances, the inventors of the present invention have conducted intensive research to solve the above drawbacks, and as a result, the number of carbon atoms] 4 to 22
If a sodium or potassium salt of a straight chain fatty acid is skillfully combined with a sodium or potassium salt of a fatty acid having 14 to 22 carbon atoms that is liquid at room temperature, it will feel good when applied to the skin and will not cause crystal precipitation. It was discovered that an emulsified composition having excellent stability over time and good emulsifying properties can be obtained, and based on this knowledge, the present invention was completed.

That is, the present invention provides: (1) at least one selected from thorium salts and potassium salts of linear saturated fatty acids having 14 to 22 carbon atoms;
(11) oil; ) Water is an oil-in-water emulsion composition.

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

The straight chain saturated fatty acids having 14 to 22 carbon atoms used in the present invention include myristic acid, □-bentatecanoic acid, palmitic acid, n-heptatecanic acid, stearic acid, n-nonatecanic acid, alaxic acid, and n-heneaicosanoic acid. , behenic acid.

The fatty acids having 14 to 22 carbon atoms that are liquid at room temperature used in the present invention include inomiristic acid, inobalmitic acid, isostearic acid, inobehenic acid, inobehenic acid, myristoleic acid, palmitoleic acid, oleic acid, /acid, linoleic acid, arachidonic acid, erucic acid, etc.

Himi BA uses at least one straight chain saturated fatty acid from among the above straight chain saturated fatty acids and fatty acids that are liquid at room temperature.
A total of three or more types of fatty acids are selected and used, including seeds and at least one type of fatty acid that is liquid at room temperature. For example, when selecting and using three types, a combination of two types of linear saturated fatty acids and one type of fatty acid that is liquid at room temperature may be used, or a combination of one type of linear saturated fatty acid and two types of fatty acids that are liquid at room temperature may be used.

"Part 2, Type 3" The total amount of fatty acids in Part 2 is 05 to 5w.
t%. If it is less than 0.5wt%, emulsification will not be good.
If it exceeds t%, it is not favorable in terms of skin safety.

The blending amount of the liquid fatty acid is 02 to 06 when the total weight of the three or more types of fatty acids is 1. This is because, when used as a sulfur/lium salt or a potassium salt, a good gel is formed in which crystals do not precipitate over a long period of time within this range of fatty acid mixing ratio.

The proportion of liquid fatty acids in the total amount of fatty acids is 20 wt%
If it is less than 60 wt%, fatty acid crystals tend to precipitate, and
If it exceeds this, the emulsifying property will deteriorate significantly.

As mentioned above, in the present invention, for example, when three types of fatty acids are combined, two types of straight chain saturated fatty acids are used, or two types of fatty acids that are liquid at room temperature are used.The weight ratio of the other straight chain saturated fatty acid is 82. They may be mixed at a ratio of ~2:8. Furthermore, if you want to increase the types of straight chain saturated fatty acids and use three or more types, the blending ratio of one fatty acid,
Alternatively, λ, which is the blending ratio of other fatty acids, may be divided at an arbitrary ratio. This means that liquid fatty acids at room temperature can be
The same applies when using a combination of more than one species.

In the present invention, as described above, by combining three or more types of fatty acids, an emulsified composition that does not precipitate fatty acid crystals and has good emulsifying properties can be obtained. The Kraft point of straight chain saturated fatty acids is
When combined with a liquid fatty acid and another type of straight chain saturated fatty acid or fatty acid that is liquid at room temperature, it is considered to be lower than *poison≠.

In the present invention, salts and/or potassium salts of the above three or more fatty acids are used.

To convert fatty acids into sodium or potassium salts, use aqueous solutions such as potassium hydroxide, sodium hydroxide, potassium carbonate, sodium carbonate, potassium phosphate, sodium citrate, sodium glutamate, sodium casei, potassium hyaluronate, etc. as usual. l-1) One or more salt-forming substances such as lamb salt or potassium salt are used.

Fatty acids may be salted and then mixed with the salt, or may be mixed and then neutralized. Furthermore, it may be incorporated into the oil-in-water emulsion composition of the present invention after being made into a salt, or a method in which the fatty acid is mixed with oil and the salt-forming substance is mixed with water to form a salt upon emulsification. I don't mind taking it.

The amount of the above-mentioned salt-forming substance blended is equal to or more than the equivalent amount of fatty acids. If the blending amount is less than the equivalent amount, fatty acids that do not ionize are likely to crystallize, and crystals will precipitate over time at low temperatures.
A stable emulsified composition cannot be obtained.

The amount of water used in the present invention is 30 to 99 wt%.

The oils used in the present invention include animal and vegetable oils such as beef tallow, squalane, olive oil, and rice bran oil, hydrocarbons, and minerals such as liquid paraffin and petrolatum. Influrovir myristate, pentaerythritol-tetra-2-
Esters such as ethylhexanoate, vitamin A balmite-1, vitamin E acetate? It is an oil commonly used in the cosmetics, pharmaceutical, food, and other industries, such as silicone oil such as methylphenyllunorifone.

The blending amount of the oil is generally 0.1 to 70% by weight.

In addition to the above-mentioned essential ingredients, the emulsified composition according to the present invention may include a humectant such as a polyhydric alcohol, a nonionic surfactant, an alon surfactant, a cationic surfactant, an amphoteric surfactant, and an amphoteric surfactant. Active agents, medicines including vitamins, ultraviolet absorbers, preservatives, antioxidants, powder components, etc. may be mixed and added. Furthermore, alcohol, other fatty acids, water-soluble polymers, etc. may be added for the purpose of homogeneity stabilization and viscosity adjustment.

In addition to sodium and potassium, basic amino acids such as arginine, lysine, and histidine can be used as counter ions for unsaturated fatty acids, as well as basic substances such as basic oligopeptides and amine sugars containing one or two of these9. By adding , an even better emulsified composition can be obtained.

The oil-in-water emulsion composition obtained in the present invention is a milky white gel-like or viscous emulsion composition in which uniform fine particles are dispersed, and is used in cosmetics such as emulsions, creams, and cosmetics/yellows. It can be suitably used in all fields as a base for toiletry products such as /boo, rinse, pharmaceuticals such as urea cream, aqui, cream, and foods such as mayonnaise.

Below, the present invention will be explained in more detail with reference to Examples and Comparative Examples. The present invention is not limited thereby.

Examples 1-5, Comparative Examples 1-5 Table 1 shows the amount of each component in weight%.

After heating and dissolving 1 part of FB at 80°C, it was added to part of FA, which had been heated and dissolved at 70°C, with stirring, and emulsified.

After homomixer treatment, it was rapidly cooled to 30°C.
An oil-in-water emulsion composition was obtained. The state of the emulsified composition was observed, the characteristic values were measured, and o'c1 room temperature, 4.

The condition was observed and evaluated after 3 months at 1°C, and the results are shown in Table 1.

Palmitic acid, stearic acid, hehenic acid 1fmt
Examples 1 to 5 according to the present invention, which contain a total of three or more mixed fatty acids, including one or two types of inostearic acid and oleic acid, are emulsion compositions in the form of milky lotions or creams. However, the stability over 3 months was very good, and no fatty acid or soap crystals were observed even at a pH around neutrality. On the other hand, in Comparative Examples 1 to 4, in which one type of strained and two types of fatty acids were blended, the amounts of ingredients other than fatty acids were the same as in Examples 1 to 5, and although emulsification was possible, After aging at 0°C for 3 months, soap or fatty acid crystals precipitated.Also, Comparative Example 6 A nutritional emulsion was obtained using the same manufacturing method as in Example 1.

This nutritional emulsion has a persimmon temperature of 4300 CP X pH 7 at 30°C.
, 4, the emulsified particle diameter was 1 to 5 μm. When this emulsion was applied to the skin, it fit the skin well and gave a moist feeling. There was no crystal precipitation over time.

Example 7 Sanocare Cream O3 Sanocare Cream O3 was obtained using the same manufacturing method as in Example 1. This Sanogaa cream had a hardness of 25″C, 20°, and an emulsion particle diameter of 1 to 3 μm, felt smooth when applied to the skin, and had sufficient UV protection effects against sunlight. The stability over time was also good.

Example 8 Funday “/, N” After thoroughly mixing 1 part of FB, it is pulverized through a pulverizer.

? Nih, wo, 70t2 VC heated stamens/tonite and kalhoki/methyl cellulose were added to the well-dissolved +Aj part and dispersed by homomixer treatment. Furthermore, TCT part dissolved at 80"C was added and emulsified. After being treated with a homomixer, it was cooled to 30°C to obtain a foundation with a hardness of 15 at 25"C. The amount of creamy foundation was 7g, and the emulsion particle size was 1 to 5μ.

Furthermore, the stability over time was good, and the finish when applied to the skin was good.

Claims (1)

[Claims] (1) (i) Straight chain saturated fatty acid having 14 to 22 carbon atoms) l) At least one selected from lamb salt and potassium salt and 14 to 22 carbon atoms which is liquid at room temperature.
A mixture of three or more fatty acid salts, including at least one selected from sodium salts and potassium salts of fatty acids, (11) oil, and (iii) water. An oil-in-water emulsion composition.