JP2000355519A - Production of emulsified cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an emulsified cosmetic having high quality in high efficiency by preventing the gelation of oil phase and keeping the viscosity to a low level in the production process. SOLUTION: The objective emulsified cosmetic is produced by using (A) a long-chain monoalkyl quaternary ammonium salt having a water content of 5-75 wt.% (e.g. hydrogenated beef tallow monoalkyltrimethylammonium salt; 25-35 wt.%), (B) a higher alcohol (e.g. cetostearyl alcohol) and (C) a polyhydric alcohol (e.g. ethylene glycol) as raw materials. It can be produced by preparing a mixture of the components A and B, mixing the component C to the mixture to obtain an oily phase and mixing and dispersing the oily phase in a water phase. The liquid crystal structure of the components A and B is destroyed by this process to prevent the gelation of the oil phase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing an emulsified cosmetic from a long-chain monoalkyl quaternary ammonium salt containing water, a higher alcohol and a polyhydric alcohol. The present invention relates to a production method for efficiently producing an emulsified cosmetic while preventing the viscosity during the production process while maintaining the viscosity at a low level.

[0002]

2. Description of the Related Art Conventionally, long-chain monoalkyl quaternary ammonium salts, higher alcohols and polyhydric alcohols have been used in various cosmetics because of their excellent effects on skin and hair. Long-chain monoalkyl quaternary ammonium salts have been treated as raw materials in a form to which water has been added for the purpose of reducing the risk of ignition.

[0003] When producing an emulsified cosmetic using such a water-containing long-chain monoalkyl quaternary ammonium salt and a higher alcohol or a polyhydric alcohol as a raw material, gelation of an oil phase occurs, and the production process becomes difficult. Since the viscosity is extremely high, there are problems that a special emulsifying device for high viscosity is required and that a long time is required for production.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention relates to a method for producing an emulsified cosmetic from a water-containing long-chain monoalkyl quaternary ammonium salt, a higher alcohol and a polyhydric alcohol. It is an object of the present invention to provide a production method for efficiently producing an emulsified cosmetic while preventing the gelation of the emulsion and maintaining the viscosity in the production process at a low viscosity.

[0005]

Means for Solving the Problems and Embodiments of the Invention The present inventors have conducted intensive studies and found that the cause of the gelation is as follows.
The present invention is based on the formation of a liquid crystal structure of a long-chain monoalkyl quaternary ammonium salt and a higher alcohol, and has found that a polyhydric alcohol can suppress gel formation by destroying the liquid crystal structure, thereby completing the present invention. did.

The process for producing the emulsified cosmetic of the present invention comprises the steps of: a) emulsifying a long-chain monoalkyl quaternary ammonium salt containing 5 to 75% by weight of water, b) a higher alcohol and c) a polyhydric alcohol as raw materials. When manufacturing cosmetics,
After preparing a mixture of a) and b), the mixture is mixed with c) to prepare an oil phase, and the oil phase and the aqueous phase are mixed and dispersed. Hereinafter, the present invention will be described in more detail. The percentages of the amounts described below are% by weight.

In the present invention, the long-chain monoalkyl quaternary ammonium salt has 6 to 24 carbon atoms, preferably 12 to 24 carbon atoms.
To 18 monoalkyltrimethylammonium salts, for example, hydrogenated tallow monoalkyltrimethylammonium salt,
And stearyltrimethylammonium salt. Here, the alkyl is optionally -OH, -O-, -CO
It refers to an alkyl group that is substituted or blocked by a functional group such as NH, -COO-, and the like. The long-chain monoalkyl quaternary ammonium salt contains 5 to 75% by weight, preferably 20 to 75% by weight of water, and may further contain a lower alcohol such as ethanol or isopropanol. The content of secondary ammonium salt is 20
-50% by weight, especially 25-35% by weight is preferred.

The higher alcohol used in the present invention has 12 to 24 carbon atoms, preferably 12 to 18 carbon atoms, particularly 16 to 1 carbon atoms.
8 saturated aliphatic alcohols. For example, cetostearyl alcohol, behenyl alcohol, cetyl alcohol, isostearyl alcohol and the like.

The polyhydric alcohol used in the present invention includes, for example, ethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, 1,3-butyleleglycol, glycerin, polyglycerin, sorbitol, dipropylene glycol and the like. is there.

In the present invention, a) the water content is previously 5 to 7;
After preparing a mixture of a long chain monoalkyl quaternary ammonium salt containing 5% by weight and b) a higher alcohol, the mixture is mixed with c) a polyhydric alcohol to prepare an oil phase. In this case, it is preferable that the ratio and the total amount of the above a) and b) and the content of c) are as follows. a) / b) = 2/1 to 1/2 a) + b) = 15 to 25% by weight, c) = 5 to 10% by weight

The oil phase may contain an oil component, an emulsifier, and other hydrophobic components. As the oily component, waxes and waxes such as higher fatty acids, higher fatty acid esters and paraffin, animal and vegetable fats and oils, squalane, liquid paraffin, silicone oil and the like can be used. These lipophilic components can be blended by any method provided that the blending method of the above a), b) and c) is maintained. That is, an oil component or an emulsifier is previously mixed in a), b) is mixed therein to prepare a mixture, and then c) is mixed to prepare an oil phase. The oil phase is prepared at a temperature equal to or higher than the melting point of the oil phase.

In the present invention, no gelation occurs during the preparation of the oil phase, so that the oil phase can be prepared using a conventional stirrer such as a paddle or a propeller. Next, the oil phase and the aqueous phase are mixed and dispersed (emulsified) using an emulsifier to obtain an emulsified cosmetic. The temperature at this time is maintained at a temperature equal to or higher than the melting point of the oil phase, and is cooled to a temperature equal to or lower than the melting point of the oil phase after the mixing and dispersion. It is preferable to blend low-boiling components such as fragrances at a temperature of 40 ° C. or less in the cooling step. At this time, the oil phase may be maintained at a temperature equal to or higher than the melting point of the oil phase, the water phase may be set to a temperature equal to or lower than the melting point of the oil phase, and the temperature after mixing the oil phase and the water phase may be equal to or lower than the melting point of the oil phase. Preferably, the mixing and dispersion of the oil phase and the aqueous phase are performed using a high-shear emulsifier such as a homomixer, and the degree of reduced pressure is preferably 100 to 600 mmHg.

As the emulsifier which can be blended in the oil phase, a nonionic emulsifier, an anionic emulsifier, a cationic emulsifier, an amphoteric emulsifier and the like can be used, and a nonionic emulsifier which is oil-soluble is preferable. Specific examples of nonionic surfactants include:
For example, sorbitan monooleate, sorbitan fatty acid esters such as sorbitan sesquioleate, lipophilic glycerin monostearate, glycerin monostearate,
Glycerin fatty acid esters such as polyglycerin monostearate, polyglycerin distearate, polyoxyethylene cetyl ether, polyoxyethylenated sterol, polyoxyethylenated lanolin, polyoxyethylenated beeswax, polyoxyethylene hydrogenated castor oil, poly Polyoxyethylene type nonions such as oxyethylene glyceryl triisostearate, and EO and PO modified silicones.

Other hydrophobic components that can be incorporated in the oil phase include oil-soluble preservatives such as methyl p-oxybenzoate, ethyl p-oxybenzoate, butyl p-oxybenzoate, and benzoic acid, and oil-soluble medicinal components. And so on.

In the present invention, the aqueous phase is purified water or a mixture of purified water and a water-soluble component. The weight ratio between the oil phase and the aqueous phase (oil phase / water phase) is 1.5 to 0.1, preferably 1 to 0.1.
0.2, particularly preferably 0.7 to 0.4. After mixing and dispersing using a part of the oil phase and the aqueous phase, the remaining aqueous phase may be mixed therein.

The water phase can contain a water-soluble component. Examples of the water-soluble component include a water-soluble polymer, water-soluble organic and inorganic salts, and the like. The water-soluble polymer may be any of a natural polymer, a semi-synthetic polymer, and a synthetic polymer. Preferred are carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, cationized cellulose, carbopol and the like. The blending amount of the polymer is not particularly limited, and is appropriately selected depending on the kind, application, etc., and is preferably 0.05 to 5%, more preferably 0 to 5%, based on the whole composition. .
It is preferable to add about 05 to 3%.

Here, the emulsified cosmetic obtained by the present invention comprises:
It is in the form of an emulsion, a suspension or the like, and these cosmetics can be specifically used for a hair composition such as a rinse, a conditioner, a treatment, and a styling agent.

Therefore, in addition to the above components, the composition obtained according to the present invention may further comprise a clay mineral, a hydrophilic surfactant, an alcohol, a humectant, a thickener, Preservatives, antioxidants, chelating agents, pH adjusters, pigments, ultraviolet absorbers / scatterers, vitamins, amino acids and the like can be added. The components that can be blended are not limited to these.

[0019]

According to the method for producing an emulsified cosmetic of the present invention, the gelation of the oil phase can be prevented and the viscosity during the production process can be kept low, so that a high-quality emulsified cosmetic can be efficiently produced. Can be manufactured.

[Examples and Comparative Examples] Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

Test Example a) Stearyltrimethylammonium chloride (solid content 3)
3%, geraniol denatured ethanol 29%, water 35%)
100 parts by weight, b) 71 parts of cetostearyl alcohol,
c) The three components of 82 parts by weight of glycerin were mixed at a temperature of 70 ° C. with a paddle stirrer by changing the charging order, and the properties of the mixture were observed. Table 1 shows the results. It can be seen from Table 1 that when a mixture of a) and b) is prepared and this is mixed with c) (Nos. 5 and 6), a low-viscosity uniform oil phase is obtained without gelling.

[0022]

[Table-1]

Example 1 In a mixing tank equipped with a propeller stirrer, 5 parts by weight of sorbitan sesquioleate, 2 parts by weight of isostearic acid, and polyoxyethylene glyceryl triisostearate (20E)
O) 5 parts by weight, stearyltrimethylammonium chloride (solid content 33%, geraniol-modified ethanol 29%,
96% by weight of water 35%), cetostearyl alcohol 70
, 3 parts by weight of methyl paraoxybenzoate and 2 parts by weight of benzoic acid were mixed and dissolved at 70 ° C., and then 80 parts by weight of glycerin (purity: 99%) were mixed to prepare an oil phase. 680 parts by weight of purified water and 3 parts by weight of hydroxyethyl cellulose were put into an Ajihomo mixer (manufactured by Tokushu Kika Kogyo Co., Ltd.), mixed and dissolved, and heated to prepare a 70 ° C. aqueous phase.
After adjusting the Ajihomo mixer to a vacuum of 350 mmHg,
The oil phase was introduced in about 30 minutes while rotating the homomixer at 1500 rpm, and the mixture was further stirred for 10 minutes.
Next, the homomixer was stopped, and the paddle mixer was turned off for 18 minutes.
Cooling was performed by flowing cooling water at 10 ° C. into the jacket of the Ajihomo mixer while rotating at rpm, and 4 parts by weight of fragrance was added at a temperature of 45 ° C., followed by stirring to 40 ° C. to obtain an emulsified cosmetic. . The tank capacity of the Ajihomo mixer is 1K
L. This emulsified cosmetic has no gelation of the oil phase in the manufacturing process, has good dispersibility of the emulsified particles, and has been subjected to a storage test at 50 ° C. for one month, but no separation of oil can be seen in the upper layer portion.
The stability was also excellent. In addition, as a result of a use test of this emulsified cosmetic, the feeling of use was also good.

Claims (1)

[Claims] 1. An emulsion cosmetic comprising a) a long-chain monoalkyl quaternary ammonium salt containing 5 to 75% by weight of water, b) a higher alcohol and c) a polyhydric alcohol as raw materials. , A) and b) are prepared, then the mixture is mixed with c) to prepare an oil phase, and the oil phase and the aqueous phase are mixed and dispersed. Production method.