JPH0764716B2 - Cosmetics - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a cosmetic composition comprising a monoester of a fatty acid and an alcohol constituting medforum oil.

2. Description of the Related Art As properties required for an oil solution for cosmetics, it is desired that skin irritation is low, safety is high, and the skin is not sticky and has a refreshing feel.

Conventional cosmetic oils include liquid paraffin, petroleum, hydrocarbons such as squalane, animal and vegetable oils and fats,
Isopropyl myristate, cetyl octylate, and waxes such as wood wax, beeswax, carnauba wax, lanolin and its derivatives are used.

In recent years, natural vegetable oils such as jojoba oil, olive oil, safflower oil, camellia oil, etc.
It has come to be favorably used as an oil agent in cosmetics. However, conventional vegetable oils and fats are oily, and have a sticky feeling on the skin, resulting in poor usability. Recently, medforum oil and its hydrogenated products have been proposed as fats and oils having a use performance that conventional natural oils do not have.
-144311).

However, since most natural fats and oils such as medhoum oil have a polyunsaturated fatty acid composition, deterioration due to oxidation cannot be avoided. As a method of improving the stability of natural fats and oils against oxidation, a method of hydrogenation is conventionally known. However, when natural fats and oils are hydrogenated, the freezing point becomes high, and the features of natural fats and oils are lost in terms of usability.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to provide a cosmetic containing a natural oily base which is excellent in stability against oxidation and has a good feeling in use.

Means for Solving the Problem The object of the present invention is solved by using a monoester of a fatty acid and an alcohol that constitute medforum oil (hereinafter, abbreviated as “medforum oil fatty acid monoester”).

That is, the present invention is based on [Limnanthes a
[lba] (commonly known as "Meadowfoam") seeds, and a cosmetic composition characterized by blending a medforum oil fatty acid monoester derived from medforum oil contained in the seeds.

Medfoam oil, which is a raw material for the medfoum oil fatty acid monoester of the present invention, is triglyceride obtained by squeezing oil or extraction from medhoum seeds, and its fatty acid composition is about 65% eicosenoic acid, about 20% docosenoic acid, and about docosadienoic acid. Made up of 10%. As described above, medforum oil contains 95% or more of unsaturated fatty acids having 20 or more carbon atoms, and has a very characteristic fatty acid composition containing almost no fatty acids having 18 or less carbon atoms.

The alcohol used as the other raw material of the medforum oil fatty acid monoester of the present invention is at least one selected from straight chain or branched chain saturated and unsaturated alcohols having 1 to 20 carbon atoms. Among these alcohols, in terms of feeling of use, etc., a straight chain saturated alcohol having 1 to 10 carbon atoms, 2
.About.20 straight chain unsaturated alcohol and C.sub.3-18 side chain saturated alcohol are preferable, and specifically, for example, medforum oil fatty acid methyl ester, ethyl ester, n-propyl ester, isopropyl ester, butyl ester, octyl ester. , 2-ethylhexyl ester,
Examples include decyl ester, oleyl ester, isostearyl ester, cocoyl ester and the like.

The medforum oil fatty acid monoester of the present invention is obtained by saponifying and decomposing medhoum oil, neutralizing and washing with water to obtain medforum oil fatty acid, and esterifying it with the alcohol by a known method. In the case of a lower alcohol ester such as methyl ester or isopropyl ester, an alcoholysis reaction between medhol oil and a lower alcohol is carried out in the presence of an alkali catalyst such as sodium hydroxide or sodium alkoxide to neutralize the catalyst after the reaction. After that, glycerin produced as a by-product may be separated, washed with water and dehydrated.

The medforum oil fatty acid monoester thus obtained is blended in a cosmetic as it is or after purification such as decolorization, deodorization or distillation. The cosmetic subject to the present invention is not particularly limited as long as it is a cosmetic using an oily base, for example, various creams, emulsions, skin cosmetics such as face wash, shampoos, rinses, conditioners, hair oils, pomades, etc. Hair cosmetics and lipstick. The present invention will be described in detail below with reference to examples and examples.

Reference Example 1 The oxidative stability of the medforum oil fatty acid monoester of the present invention was measured and compared with that of medforum oil and olive oil.
The results are shown in Table 1.

The oxidation stability is 2.4.12-71 of the standard oil and fat analysis test method.
The peroxide value (POV) was measured by (60 ℃ -10 days, 25
Days) and evaluated according to the following criteria. The lower the POV, the better the stability against oxidation.

(Evaluation Criteria) ◎: POV 0-5 ○: POV 5-10 △: POV 10-20 ▲: POV 20-100 ×: POV 100 <skin 1 of the medforum oil fatty acid monoester of the present invention
In order to examine the secondary irritation, a closed patch test was performed on 20 healthy people using a patch test plaster made by Torii Pharmaceutical Co., Ltd. When judged 24 hours later and 48 hours later, no skin irritation was observed in any of the medforum oil fatty acid monoesters shown in Table 1.

Example 1 Using the various oily bases shown in Table 2, creams having the following formulations were prepared, and the feeling of use and storage stability were examined.

[Prescription] (A) Oil phase-Oil base (Table 2) 38 parts (B) Water phase-Glycerin monostearate 3-Polyoxyethylene sorbitan monolaurate 2-Purified water 57 Preparation method (A) 80 The mixture is heated and stirred at 0 ° C, (B) at the same temperature is added thereto, and the mixture is cooled with stirring.

[Feeling in use] When 5 men and 5 men use the cream, and when the novi and stickiness at the time of use are the same as those of the cream containing medphoum oil, it is 0, when it is excellent, it is +1 and when it is inferior − An evaluation score of 1 was assigned, and the evaluation was made as follows according to the total score of 10 evaluation scores.

Total score Judgment -10 to -6 ... x -5 to 0 ... △ 1 to 5 ... ○ 6 to 10 ... ◎ [Storage stability] Put the prepared cream in a sample bottle and put it in a constant temperature bath at 50 ° C. It was stored for 45 days and the state of the cream was visually evaluated. The criteria for judgment are as follows.

∙ No change in appearance and odor ○ ‥ Slightly colored △ ‥ Slightly colored and slightly offensive From the results shown in Table 2, it is clear that the cream containing the medforum oil fatty acid monoester of the present invention is excellent in storage stability and usability. Various cosmetics were prepared in Examples 2 to 6 below.

Example 2 Hair oil / Olive oil 19 parts / Medholm oil Fatty acid isopropyl 80 / Fragrance 1 All raw materials were mixed at 60 ° C and uniformly dissolved.

Example 3 Emulsion (A) Oil phase- Liquid paraffin 20 parts- Medfoum oil fatty acid isostearyl 4.5- Polyoxyethylene cetyl ether (3) 1.1- Polyoxyethylene oleyl ether (8) 2.2 (B) Aqueous phase- Polyethylene glycol ( 1000) 0.25 ・ Propylene glycol 5.0 ・ Glycerin 3.0 ・ Carboxy vinyl polymer (0.5% aqueous solution) 10.0 ・ Lauroyl glutamic acid monosodium salt 0.1 ・ Methylparaben 0.1 ・ Purified water Residual 100 parts (A) is heated and stirred at 80 ° C and stirred at the same temperature. (B) was gradually added with stirring to emulsify.

Example 4 Cream (A) oil phase-Spalm aceti 4.0 parts-Cetanol 5.0-Medfoam oil fatty acid-2-ethylhexyl 7.0-Polyoxyethylene cetyl ether (15) 1.0-Polyethylene glycol monostearate (400) 7.0 (B) Water phase -Propylene glycol 1.0 -Purified water The remaining 100 (A) was heated and stirred at 80 ° C, and (B) at the same temperature was gradually added with stirring to emulsify.

Example 5 Hair rinse (A) Oil phase-Distearyl dimethyl ammonium chloride 2.5 parts-Stearyl trimethyl ammonium chloride 1.0-Cetanol 2.0-Medphoum oil fatty acid oleyl 1.0-Glycerin monostearate 1.0-Polyoxyethylene oleyl ether (10) 1.0 ( B) Aqueous phase-Methylparaben 0.1-Propylene glycol 3.0 -Purified water Residual 100 (A) is heated and stirred, and the same is heated (B) and stirred. Cooled with stirring.

Example 6 Oil Shapoue N-Cocoyl-L-glutamic acid triethanolamine salt (30%) 30 parts Lauric acid diethanolamide 5 Medofum oil fatty acid butyl 0.5 Lauryl ether sulfate sodium salt (25%)
37 ・ Edetic acid disodium salt 0.1 ・ Methylparaben 0.2 ・ Citric acid pH = 6 amount ・ Purified water Residual 100 The storage stability and feeling of use of the various cosmetics of Examples 2 to 6 were examined. there were.

EFFECTS OF THE INVENTION The cosmetic composition of the present invention is excellent in oxidative stability and usability even though it contains a natural fat derivative.

Claims (2)

[Claims] 1. A cosmetic comprising a monoester of a fatty acid and alcohol constituting medforum oil. 2. The cosmetic according to claim 1, wherein the alcohol is at least one alcohol selected from straight-chain or branched-chain saturated alcohols having 1 to 20 carbon atoms and unsaturated alcohols.