JP2008088092A - O/w-type emulsified liquid cosmetics - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide O/W-type emulsified liquid cosmetics compounded with a large amount of oleum and having a low viscosity and excellent stability after the elapse of time. <P>SOLUTION: The O/W-type emulsified liquid cosmetics having a viscosity of ≤500 mPa s at 25°C are produced by compounding (A) 0.5-2.0 mass% isostearic acid, (B) a basic amino acid, (C) 7-20 mass% oleum, (D) 0.2-1.5 mass% glycerol monostearate and (E) 0.2-1.5 mass% higher alcohol. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a liquid oil-in-water emulsified cosmetic containing isostearic acid, a basic amino acid, an oil, glyceryl monostearate, and a higher alcohol, and more specifically, a liquid oil-in-water type that is excellent in stability over time while having low viscosity. It relates to emulsified cosmetics.

The skin lotion is mainly used for the purpose of giving moisture to the skin, and it is possible to enhance the moisture retention by solubilizing a small amount of oil. Further, there are emulsified cosmetics that further improve the moisturizing effect by adding oil, and among them, oil-in-water emulsified cosmetics that give a fresh feeling to use.

However, oil-in-water emulsified cosmetics try to strengthen oil-water interface films by blending higher alcohols, etc., and blend water-soluble polymers to impart viscosity to aqueous systems in order to blend oil stably. There has been a need for an attempt to improve the stability over time. For this reason, many of the properties of oil-in-water emulsified cosmetics are often milky to creamy, and may have the disadvantage of poor usability such as poor spreading when high viscosity. In addition, there may be a sticky feeling caused by higher alcohols or water-soluble polymers.

Under such circumstances, emulsified cosmetics containing a large amount of oil by combining a fatty acid and a specific nonionic surfactant have been studied (for example, see Patent Document 1). Further, studies have been made on emulsions in which branched saturated fatty acids that are liquid at room temperature such as isostearic acid are blended as oils (see, for example, Patent Document 2).
JP-A-58-024325 JP 2001-270807 A

In patent document 1, although it is a technique regarding the emulsified composition using the fatty acid in a weakly acidic area | region, the skin familiarity resulting from a nonionic surfactant may be bad. Furthermore, all of the examples were emulsions or creams and were not low-viscosity. Further, in Patent Document 2, it is necessary to blend an appropriate amount of isostearic acid with respect to the oil agent, but sometimes stickiness or the like due to a nonionic surfactant used for stable blending may be felt.

The present invention has been made in view of the above circumstances, and provides a liquid oil-in-water emulsified cosmetic that is liquid and excellent in stability over time while containing a large amount of oil. .

In view of such a situation, the present inventors have intensively studied, and as a result, neutralized isostearic acid with a basic amino acid and combined with glyceryl monostearate and a higher alcohol to stably mix a large amount of oil in a liquid oil-in-water type. The present inventors have found that a cosmetic can be obtained and completed the present invention.

That is, the present invention includes the following components (A) to (E);
(A) 0.5-2.0 mass% isostearic acid
(B) Basic amino acid (C) Oil agent 7-20 mass%
(D) Glycerol monostearate 0.2-1.5 mass%
(E) Higher alcohol 0.2-1.5 mass%
And a liquid oil-in-water emulsified cosmetic having a viscosity of 500 mPa · s or less at 25 ° C.

Moreover, each compounding mass ratio of component (A), (D), (E), (A) / (E) is 2.0-4.0, (D) / (E) is 1.0-2. The present invention relates to a liquid oil-in-water emulsified cosmetic.

The present invention also relates to a liquid oil-in-water emulsified cosmetic, wherein component (B) is L-arginine.

The present invention also relates to a liquid oil-in-water emulsified cosmetic, wherein the average particle size of the emulsified droplets of the liquid oil-in-water emulsified cosmetic is 0.3 μm or less.

The liquid oil-in-water emulsified cosmetic of the present invention has a low viscosity and excellent usability even when a large amount of an oil agent is blended, and is excellent in stability over time.

The present invention will be described in detail.
The component (A) isostearic acid used in the present invention is used as an emulsifier in the present invention and is not particularly limited. As an example, there are 2-heptylundecanoic acid obtained by the gerbet method, 2-isoheptylisoundecanoic acid obtained by the aldol condensation method, and by-products produced during the production of dimer acid. Commercially available products include isostearic acid EX (manufactured by Higher Alcohol Industry).

In addition, component (A) isostearic acid stably emulsifies a large amount of oil agent, and the blending amount is 0.5 to 2.0% by mass (hereinafter,% by mass is%) from the viewpoint of stability over time. (Omitted) is preferable. If it is less than 0.5%, sufficient emulsifying power cannot be obtained, and if it exceeds 2.0%, it is not preferable from the viewpoint of stability over time and safety.

The basic amino acid of the component (B) of the present invention is used as a neutralizing agent for the component (A) and is not particularly limited. Specific examples include arginine, lysine, histidine and the like, and among them, arginine is preferable from the viewpoint of stability over time. Commercially available products include L-arginine Kyowa (manufactured by Kyowa Hakko).

Further, the component (B) needs an amount for neutralizing the component (A). The pH value of the liquid oil-in-water emulsified cosmetic of the present invention may be an amount that falls within the range of 6.0 to 8.0 at 25 ° C. Specifically, the blending mass ratio (A) / (B) may be in the range of 1 / 0.4 to 0.8.

The oil agent of component (C) used in the present invention is not limited to the origin of animal oils, vegetable oils, synthetic oils and the like commonly used in cosmetics and the properties of solid oils, semi-solid oils, liquid oils, volatile oils, etc. Hydrocarbons, fats and oils, waxes, hardened oils, ester oils, fatty acids, silicone oils, fluorine-based oils, lanolin derivatives, and the like. Specifically, hydrocarbons such as liquid paraffin, squalane, petrolatum, polyisobutylene, polybutene, paraffin wax, ceresin wax, microcrystalline wax, montan wax, fish trops wax, olive oil, castor oil, jojoba oil, mink oil , Vegetable oils such as macadamian nut oil, beeswax, carnauba wax, candelilla wax, waxes such as gay wax, owl, cetyl isooctanoate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, glyceryl trioctanoate, Polyglyceryl diisostearate, diglyceryl triisostearate, glyceryl tribehenate, pentaerythritol ester of rosin acid, neopentyl glycol dioctanoate, Esters of terol fatty acid esters, N-lauroyl-L-glutamic acid di (cholesteryl, behenyl, octyldodecyl), fatty acids such as stearic acid, lauric acid, myristic acid, behenic acid, isostearic acid, oleic acid, rosin acid, Silicones such as low polymerization dimethylpolysiloxane, high polymerization dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, polyether-modified polysiloxane, cross-linked organopolysiloxane, fluorine-modified silicone Fluorine oils such as perfluoropolyether, perfluorodecane, perfluorooctane, lanolin derivatives such as lanolin, lanolin acetate, lanolin fatty acid isopropyl, lanolin alcohol, etc. Gerare, these can be used singly or in combination, it is inter alia non-polar oil, squalane, hydrocarbon oil such as liquid paraffin are preferable in view of stability over time in a liquid state at 25 ° C..

As a compounding quantity of a component (C), it is 7 to 20%, and the emollient effect by an oil agent is fully acquired as it is this range. On the other hand, if the blending amount is less than 7%, the emollient effect required in the present invention cannot be sufficiently obtained, and if it exceeds 20%, stickiness of the oil agent and creaming are observed, which is not preferable in terms of stability over time.

The component (D) glyceryl monostearate used in the present invention is not particularly limited and is used as an emulsification aid in the present invention. Specifically, it is obtained by transesterification of glycerin and a vegetable hardened fat derived from palm or rapeseed. Examples of commercially available products include Poem V-100 (manufactured by Riken Vitamin Co., Ltd.).

The amount of component (D) is preferably 0.2 to 1.5%. If it is less than 0.2%, the effect as an emulsification aid is insufficient and the emulsified state is not good, and if it exceeds 1.5%, crystal precipitation of the component (D) is observed and the stability over time is not preferred.

The higher alcohol of component (E) used in the present invention is not particularly limited as long as it is used as an emulsification aid in the present invention and is usually used in cosmetics. Specific examples include hexyl alcohol, heptyl alcohol, octyl alcohol, nonyl alcohol, decyl alcohol, undecyl alcohol, dodecyl alcohol, tridecyl alcohol, tetradecyl alcohol, pentadecyl alcohol, cetyl alcohol, heptadecyl alcohol, octadecyl Alcohol, stearyl alcohol, nonadecyl alcohol, aralkyl alcohol, behenyl alcohol, etc. are mentioned, 1 type (s) or 2 or more types can be selected and used. In the present invention, cetostearyl alcohol in which cetyl alcohol and stearyl alcohol are blended is particularly preferred from the viewpoint of stability over time, and commercially available products include cetanol K (manufactured by Higher Alcohol Industry).

Moreover, the compounding quantity of a component (E) is 0.2-1.5%, and it can be set as the liquid oil-in-water-type emulsified cosmetics which are excellent in temporal stability though it is low viscosity in this range. If the blending amount is less than 0.2%, the effect of strengthening the film at the interface of the emulsified droplets is not sufficient and the temporal stability is not good. On the other hand, if it exceeds 1.5%, the viscosity exceeds 500 mPa · s at 25 ° C., which exceeds the target region in the present invention.

In this invention, (A), (D), each compounding mass ratio of (E), (A) / (E) is 2.0-4.0, (D) / (E) is 1.0-2. 5 is preferable. By blending each component within this range, it is possible to adjust an oil-in-water emulsified liquid cosmetic excellent in fluidity while maintaining good temporal stability.

The average particle size of the oil-in-water emulsified liquid cosmetic of the present invention is preferably 0.3 μm or less in view of stability over time, and if it is 0.3 μm or less, the progress of creaming can be effectively suppressed. The average particle size of the liquid oil-in-water emulsified cosmetic according to the present invention was measured with a submicron particle analyzer N5 (manufactured by Coulter Electronics Co., Ltd.).

In addition to the above components, the liquid oil-in-water emulsified cosmetic of the present invention usually includes components used in cosmetics, such as powders, surfactants, oil gelling agents, aqueous components, polymers, and oxidation. Inhibitors, antibacterial agents, ultraviolet absorbers, water-soluble polymers, film forming agents, preservatives, vitamins, cosmetic ingredients, fragrances, and the like can be appropriately blended within a range not impairing the effects of the present invention.

The oil-in-water emulsified liquid cosmetic of the present invention can be made more excellent in stability with time by being treated with a strong shearing force by a high-pressure emulsifier such as a microfluidizer.

The liquid state in the present invention means that the viscosity at 25 ° C. is 500 mPa · s or less. The viscosity value of the liquid oil-in-water emulsified cosmetic in the present invention was measured with a B-type rotational viscometer (manufactured by Shibaura Systems Co., Ltd.).

The use of the liquid oil-in-water emulsified cosmetic of the present invention can be exemplified by beauty liquid, body lotion, milky lotion, etc. The method of use is a method of hand use, a method of impregnating a nonwoven fabric, and the like. Can be given.

EXAMPLES Next, although an Example is given and this invention is further demonstrated, this invention is not limited at all.

Invention products 1-6 and comparative products 1-6: Liquid oil-in-water cosmetics Liquid oil-in-water compositions having the compositions shown in Tables 1 and 2 were prepared by the following production method, and “viscosity (mPa · s)”, Each item of “average particle diameter of emulsified droplets (μm)” and “time stability” was evaluated and determined by the following evaluation methods and criteria, and the results are shown in Table 1 and Table 2.

(Production method)
A: Components 1 to 6 are mixed and dispersed uniformly.
B: Components 7 to 14 are uniformly mixed and dispersed.
C: Both A and B are heated to 70 ° C., and A is added to B and mixed.
D: C is processed with a high-pressure emulsifier (manufactured by MICROFLUIDICS: Microfluidizer M-110EH 700 bar).
E: Add 15 to 18 to D and mix.

[Evaluation Method 1: Viscosity]
Each material was stored at 25 ° C., and the viscosity value was measured with a B-type rotational viscometer (manufactured by Shibaura Systems Co., Ltd.) on the next day.

[Evaluation Method 2: Average Particle Size]
About the lotion immediately after preparation, the average particle diameter of the emulsified droplet was measured with a submicron particle analyzer N5 (manufactured by Coulter Electronics Co., Ltd.) and evaluated according to the following evaluation criteria.
Judgment criteria:
[Average score]: [Judgment]
0.3 μm or less: ◎
More than 0.3μm and 0.5μm or less: ○
More than 0.5 μm and less than 5.0 μm: Δ
5.0 μm or more: ×

[Evaluation Method 3: Stability over time]
Each sample was stored in a thermostatic bath at 50 ° C. for 1 month, and the presence or absence of creaming, aggregation, gelation, etc. was compared with a product stored at room temperature for 1 month, and the difference in appearance was determined using the following four-stage criteria. .
Judgment criteria:
[Grade]: [Judgment]
No difference: ◎
Almost no difference: ○
Some differences: △
There is a considerable difference: ×

  As is clear from the results of Tables 1 and 2, the liquid oil-in-water emulsified cosmetics of the products 1 to 11 of the present invention have a fresh feeling of use and a high moisturizing effect. Also in each evaluation item, the viscosity was 500 mPa · s or less, the average particle diameter of the emulsified droplets was 3 μm or less, and the results were excellent in stability over time. On the other hand, in comparative product 1 in which component A was replaced with stearic acid, crystal precipitation of stearic acid over time was observed, and the stability over time was particularly poor. Comparative product 2 containing 3% of component A was inferior particularly in the item of “time stability”. Further, Comparative products 3 to 6 in which the base for neutralizing the component A was replaced with a substance other than the basic amino acid were not good in the item of “stability with time”. Moreover, in the comparative product 7 which mix | blended 25% of oil agents, it was inferior about all the items. In comparative product 8 in which component D was not blended, the temporal stability was very poor. Further, Comparative Product 9 containing 2% of Component D was slightly inferior with respect to the item of “aging stability”. Moreover, in the comparative product 10 containing no higher alcohol, creaming was observed in the comparative product 11 containing 2%, and crystal precipitation was observed, and the stability over time was inferior.

Example 2: Sunburn prevention lotion (ingredient) (%)
1. Isostearic acid 1.2
2. Behenyl alcohol 0.5
3. 2-Ethylhexyl paramethoxycinnamate 8.0
4). Vaseline 2.0
5. Glycerol monostearate 1.5
6). L-Arginine 0.6
7). Glycerin 3.0
8). Purified water balance 9. Citric acid 0.12
10.1,3-butylene glycol 10.0
11. Purified water 34.0

(Production method)
A: 1 to 5 are heated and mixed at 70 ° C.
B: 6-8 are heated and mixed at 70 ° C.
C: C is added to B and mixed. D: C is treated with a high-pressure emulsifier (MICROFLUIDICS: Microfluidizer M-110EH 700 bar). 9: 11 is added to E: D and mixed.

The liquid oil-in-water emulsified composition of Example 2, which is an embodiment of the present invention, had a viscosity of 150 mPa · s, an average particle size of the emulsified droplets of 0.3 μm or less, and was excellent in stability over time.

Claims (4)

The following components (A) to (E);
(A) 0.5-2.0 mass% isostearic acid
(B) Basic amino acid (C) Oil agent 7-20 mass%
(D) Glycerol monostearate 0.2-1.5 mass%
(E) Higher alcohol 0.2-1.5 mass%
A liquid oil-in-water emulsified cosmetic having a viscosity at 25 ° C. of 500 mPa · s or less. Each compounding mass ratio of said component (A), (D), (E), (A) / (E) is 2.0-4.0, (D) / (E) is 1.0-2.5. The liquid oil-in-water emulsified cosmetic according to claim 1, wherein The liquid oil-in-water emulsified cosmetic according to claim 1 or 2, wherein the component (B) is L-arginine. The liquid oil-in-water emulsified cosmetic according to any one of claims 1 to 3, wherein an average particle size of the emulsified droplets of the liquid oil-in-water emulsified cosmetic is 0.3 µm or less.