JPS61137810A - Cosmetic - Google Patents

Abstract

PURPOSE:Cosmetic water-soluble transparently, causing no insoluble substances with time, solubilizing stably an oil-soluble substance such as perfume, etc., having improved water retention effect, using a polyglycerin fatty acid ester which is treated with an aqueous solution of a lower alcohol as a solubilizer for the oil-soluble substance. CONSTITUTION:Cosmetic containing a polyglycerin fatty acid ester which is treated with an aqueous solution of a lower alcohol as a solubilizer for an oil-soluble substance. In a method of treating the polyglycerin fatty acid ester with the aqueous solution of a lower alcohol, the polyglycerin fatty acid ester is dissolved in the aqueous solution of a lower alcohol such as ethanol, etc., the solution is cooled preferably to <=10 deg.C, and a precipitated insoluble substance is purified. The concentration of the fatty acid ester dissolved is preferably <=40wt%. A hydrophilic compound obtained by esterifying 4-18wt% hydroxy group of a polyglycerin (8-16 average polymerization degree) with >=12C higher fatty acid is used as the polyglycerin fatty acid ester.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cosmetic composition characterized in that a polyglycerol fatty acid ester treated with an aqueous solution of lower alcohol is used as an oil-soluble substance solubilizer.

Polyglycerin fatty acid esters are highly safe and are widely used in the food field as foaming agents for cakes, emulsifiers for coffee relish and whipped cream, viscosity lowering agents in the tempering process in chocolate manufacturing, etc.

However, it has hardly been used in pharmaceuticals or cosmetics yet.

Polyglycerin fatty acid ester has several hydroxyl groups in one molecule, and the greater the number of hydroxyl groups, the higher the water retention property. In addition, since it has excellent usability, the present inventors used it as a solubilizer for oil-soluble substances with water-retaining properties.
We focused on hydrophilic polyglycerin fatty acid esters. However, commercially available polyglycerin fatty acid esters are difficult to use because they dissolve in water but are cloudy or produce insoluble matter over time.

As a result of intensive research to solve these problems, the present inventors found that hydrophilic polyglycerol fatty acid ester treated with a lower alfur aqueous solution dissolves transparently in water and does not produce insoluble matter over time. It was discovered that oil-soluble substances such as fragrances and vitamins can be stably solubilized. Furthermore, due to the high water retention properties of polyglycerin fatty acid esters, cosmetics containing this have excellent water retention effects.

The method of treating polyglycerin fatty acid ester with an aqueous lower alcohol solution according to the present invention includes ethanol, inpropatol, ethylene glycol, glycerin, 1.3-
A polyglycerol fatty acid ester is dissolved in an aqueous solution of a lower alcohol such as butylene glycol, propylene glycol, or a mixture thereof. Basically, polyglycerin fatty acid ester, lower alcohol, and water may be dissolved in any order as long as they are uniform. If left for one day or more, insoluble matter will precipitate, and this will be removed by filtration, adsorption, etc. to form a transparent solution. In order to completely precipitate insoluble matter and perform sufficient purification, it is preferable to cool the mixture to 10° C. or lower. The precipitated insoluble matter is considered to be a lipophilic polyglycerol fatty acid ester with a high degree of esterification of higher fatty acids, as determined by gas chromatography and saponification value.

In the treatment of polyglycerol fatty acid ester with a lower alcohol aqueous solution of the present invention, the concentration of lower alfur in the lower alcohol aqueous solution is in the range of 20 to 80%,
Preferably it is 40 to 60% by weight. If the concentration of the lower alcohol is less than 20% by weight or more than 80% by weight, the amount of precipitated insoluble matter will be small and purification will not be sufficient, making it unsuitable for the present invention.

The concentration of polyglycerol fatty acid ester dissolved in the lower alcohol aqueous solution is preferably 40% by weight or less. When the concentration of polyglycerin fatty acid ester is 40% by weight or more, the solution viscosity of the three-component system of lower alcohol-water-polyglycerin fatty acid ester becomes high, making it difficult to remove insoluble matter by filtration, adsorption, etc.

In the present invention, polyglycerin fatty acid ester, which can be used as a solubilizer for oil-soluble substances by treatment with a lower alfur aqueous solution, is produced by converting 4 to 18% of the hydroxyl groups of polyglycerin (average degree of polymerization 8 to 16) into A compound obtained by esterification with the above higher fatty acids, whose H
LB is in the range of about 9-18. Polyglycerin fatty acid esters with HLBf of 9 or less are no longer hydrophilic and are difficult to purify by treatment with a lower alcohol aqueous solution. Furthermore, polyglycerol fatty acid esters having an HLE of 18 or more have a weak ability to solubilize oil-soluble substances and are therefore unsuitable for the present invention.

The higher fatty acids of the polyglycerin fatty acid ester used in the present invention are linear or side chain saturated or unsaturated fatty acids having 12 or more carbon atoms, such as lauric acid, myristic acid, valmitic acid, stearic acid, and behenic acid. ,
Examples include isopalmitic acid, isostearic acid, 12-hydroxystearic acid, and oleic acid.

Next, using polyglycerol laurate purified by the method of the present invention, an experiment was conducted to solubilize single fragrances geraniol and linalyl acetate using the following formulation. The results are also shown in Table 1.

Prescription for solubilization experiment Propylene glyfur 5.0wt J1% geraniol (or linalyl 0.2wt% acetate) Make up to 100% by weight with purified water.

When the LB of polyglycerol laurate is 18 or more, the solubilizing power of single fragrances decreases. Similar results were also obtained for other fatty acid esters. Therefore, in the present invention, HLBd; Polyglycerin fatty acid esters of 18 or more are unsuitable.

Table 1 PG; Polyglycerin Numbers in parentheses: Degree of polymerization of polyglycerin I, monolaurate 2L; dilaurate Next, the present invention will be specifically explained with reference to Examples. In addition, % in an example is weight %.

! [[1, Moisture rosin fragrance (green floral tone) O, OS glycerin
3 propylene glycol
3 Make it 100% with purified water.

First, decaglycerin monolaurate is uniformly dissolved in a 50% ethanol aqueous solution. After this was left in a cooled state at 5° C. for one day, the precipitated insoluble matter was filtered to obtain a transparent solution. Next, after dissolving a fragrance, which is an oil-soluble substance, in this solution, glycerin, propylene glycol, and purified water were sequentially added to obtain a transparent moisturizing lotion.

The obtained moisture lotion was stable without becoming cloudy over time or producing insoluble matter. It also has high water retention and provides an excellent feeling of use.

Example 2. Set low silane olive alcohol 0.2 ethanol
70 polyvinylpyrrolidone
Make 100% with 0.5 purified water.

A transparent setting lotion was obtained in the same manner as in Example 1. This setting low silane has high water retention and leaves hair supple.

Example 6. Vitamin-containing para, natural vitamin E0.1 Ethanol 10 Polyvinyl alcohol 13 Make 100% with purified water.

A transparent film-type vitamin-containing bank was obtained in the same manner as in Example 1. This pack has high water retention and leaves you feeling moisturized after use.

Example 4 Hand lotion fragrance (citrus tone) O,OS ethylene glycol 5 urea
2 Make it 100% with purified water.

A transparent hand lotion was obtained in the same manner as in Example 1. This hand lawn has high water retention and prevents cracks and redness.

Claims (2)

[Claims] (1) A cosmetic product characterized in that a polyglycerin fatty acid ester treated with an aqueous lower alcohol solution is used as a solubilizer for an oil-soluble substance. (2) The polyglycerin fatty acid ester is a hydrophilic compound obtained by esterifying 4 to 18% of the hydroxyl groups of polyglycerin (average degree of polymerization 8 to 16) with a higher fatty acid having 12 or more carbon atoms, or a mixture thereof. , the cosmetic according to claim (1).