JP5038941B2 - Oil-in-water emulsified cosmetic - Google Patents

Description

  The present invention relates to an oil-in-water emulsified cosmetic, and more particularly to an oil-in-water emulsified cosmetic that has a refreshing feel without being sticky even when multiple glycerins are added.

Conventionally, glycerin has been known as a cosmetic ingredient having a skin improvement effect such as a high moisturizing effect and a rough skin improvement effect. However, when trying to add glycerin to obtain a skin improvement effect, a high skin improvement effect can be obtained, but on the other hand, there is a lack of freshness and a sense of penetration that the active ingredient penetrates into the skin, resulting in stickiness Will have.
Therefore, in recent years, in order to reduce and refresh the stickiness due to glycerin blending, Patent Document 1 suppresses stickiness derived from glycerin by using a fatty acid glycerin ester in combination. However, this technique has not yet fully satisfied the stickiness reduction effect.
Patent Document 2 discloses a water-in-oil emulsified cosmetic for preventing rough skin, containing 0.1 to 20% by mass of an organopolysiloxane elastomer spherical powder and 3 to 25% by mass of glycerin. However, since this technique is a water-in-oil type, the freshness peculiar to the oil-in-water emulsification type has been insufficient.
As described above, in the conventional technique, in order to reliably obtain a high skin improvement effect by glycerin, in a high blending system of glycerin of about 10% by mass or more, it is possible to sufficiently satisfy the stickiness reducing effect and the refreshing effect. The current situation has not yet been reached.

JP 11-246329 A JP 2002-356416 A

  The present invention has been made in order to solve the conventional problems as described above, and when using a high amount of glycerin, the feeling of use is poor, causing stickiness, and resulting in a heavy, crisp cream. It is an object of the present invention to provide an oil-in-water emulsified cosmetic that does not become sticky even when highly blended with glycerin and has a fresh feel.

  As a result of intensive studies in order to solve the above problems, the present inventors have improved the feeling of use by using a sorbitan surfactant, and obtained a fresh feeling of use, and a specific substance containing this surfactant. It has been found that, by blending three kinds of activators and a higher alcohol at an appropriate blending ratio, a stable and non-sticky base can be provided despite the high blending of glycerin.

That is, the present invention
(A) 10-25% by mass of glycerin;
(B) a surfactant composed of “polyoxyethylene sorbitan fatty acid ester”, “glycerin monofatty acid ester or glycerin monofatty acid ether”, and “polyethylene glycol stearate (100E.O.)”;
(C) one or more selected from higher alcohols having 14 to 22 carbon atoms;
And the total molar concentration of (b) is 0.2 to 0.8 when the molar concentration of (c) is 1, which is an oil-in-water emulsified cosmetic.

  According to the present invention, since glycerin is highly blended at 10 to 25% by mass, it has an excellent moisturizing effect, has a fresh and pleasant feel, has no stickiness, and has good emulsifying properties and stability. An oil-in-water emulsified cosmetic can be provided.

The best mode of the present invention will be described below.
(A) Glycerin used in the present invention has a skin improvement effect such as a high moisturizing effect and a rough skin improvement effect as described in the section of the prior art. In the present invention, the glycerin is blended in an amount of 10 to 25% by mass, preferably 10 to 20% by mass.

  The component (b) used in the present invention is composed of “polyoxyethylene sorbitan fatty acid ester”, “glycerin mono fatty acid ester or glycerin mono fatty acid ether” and “polyethylene glycol stearate (100E.O.)”. The surfactant must contain all three components, and “polyoxyethylene sorbitan fatty acid ester” and “glycerin monofatty acid ester or glycerin monofatty acid ether” should each be used alone or in combination of two or more. I can do it.

  Among the components (b), the “polyoxyethylene sorbitan fatty acid ester” is preferably derived from a single-bonded fatty acid having a fatty acid portion of 14 to 18 carbon atoms, particularly polyoxyethylene (POE) (20) mono. Preferred are sorbitan stearate (polysorbate 60), POE (20) sorbitan monopalmitate (polysorbate 40), POE (20) sorbitan monooleate (polysorbate 80), and POE (20) sorbitan monoisostearate, among which polysorbate 60 Is preferred. In the present invention, one or more of these are selected and used. By blending “polyoxyethylene sorbitan fatty acid ester”, a fresh and refreshing feel is imparted.

  Among the components (b), examples of the “glycerin monofatty acid ester or glycerin monofatty acid ether” include glyceryl stearate, glyceryl oleate, and glyceryl monostearyl ether (batyl alcohol), and preferably glyceryl stearate. In the present invention, one or more of these are selected and used.

  Among the components (b), “polyethylene glycol stearate (100EO)” is obtained by addition-polymerizing ethylene oxide to stearic acid to obtain a polyethylene glycol ester having 100 polyethylene glycol units.

  (B) Although the compounding quantity of 3 components which are components is not specifically limited, It is preferable that each is 0.1 mass% or more. Moreover, 0.5-6 mass% is preferable, and, as for the total compounding quantity of 3 components which are (b) components, More preferably, it is 1.4-4 mass%.

  Further, the total blending amount of the component (b) is required to be 0.2 to 0.8 when the molar concentration of the component (c) described later is 1. Yes, preferably the total molarity is 0.4 to 0.65. If the total molar concentration of the component (b) is less than 0.2, the higher alcohol is liable to precipitate in the long-term stability, so that the stability is lacking, and if the total molar concentration of the component (b) exceeds 0.8, the high temperature Leads to separation and viscosity instability and lacks stability.

  The higher alcohol (c) used in the present invention is preferably an unbranched higher alcohol having 14 to 22 carbon atoms, such as myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, oleyl alcohol, etc. Among them, cetyl alcohol It is preferable that 1 or more types of stearyl alcohol and behenyl alcohol are contained.

  In the present invention, the blending amount of the higher alcohol (c) is preferably 0.1 to 7.0% by mass, and more preferably 0.2 to 6.0% by mass.

  Furthermore, an organic acid or a salt thereof can be added to the cosmetic of the present invention as a component effective for stabilizing or applying the cosmetic. Examples of such organic acids include citric acids, amino acids, ascorbic acid and derivatives thereof, salicylic acid and derivatives thereof, tranexamic acid and derivatives thereof, glycolic acid and derivatives thereof, pyrrolidone carboxylic acid, sodium lactate, ellagic acid, glycyrrhizic acid, Examples include edetic acid, and these salts are also effective. As for the compounding quantity of organic acids, 0.1-3.0 mass% is preferable.

  The embodiment of the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and is in a state corresponding to each form such as emulsion, cream, cosmetic liquid, foundation, makeup base, lipstick, hair styling agent, hair care agent, etc. It is possible to use.

  In the oil-in-water emulsified cosmetic of the present invention, in addition to the above essential components, powders, oils, active agents other than those described above, moisturizers, drugs, sequestering agents, as necessary, as long as the effects are not hindered. Lower alcohols, polyhydric alcohols, antioxidants, preservatives, fragrances and the like can be blended.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. Unless otherwise specified, the amount is shown in mass%.

Examples 1-11, Comparative Examples 1-11
Oil-in-water emulsified cosmetics were prepared by a conventional method with the formulations shown in Tables 1 and 2 below.
Subsequently, the characteristics of these oil-in-water emulsified cosmetics were evaluated. The results are also shown in Tables 1 and 2. Evaluation items are freshness, non-stickiness, emulsification, and emulsification stability during application, and the evaluation methods are shown below.

(Freshness during application)
Freshness at the time of application was evaluated by 20 specialist panels.
○ (Good): 15 or more panel evaluated as fresh △ (Slightly bad): 8 or more panel evaluated as fresh 14 or less × (Bad): 7 or less panel evaluated as fresh

(No stickiness)
Twenty expert panels evaluated the non-stickiness after application.
○ (Good): 15 or more panels evaluated as non-sticky △ (Slightly bad): 8 or more panels evaluated as non-sticky 14 or less × (Poor): 7 panels evaluated as non-sticky Below

(Emulsifying)
The state of the emulsified particles immediately after sample preparation was evaluated.
○ (Good): The particles are fine and uniform.
Δ (slightly poor): The particle diameter is not uniform, and coalescence and aggregation are observed at a ratio of 20% or less.
X (defect): Particles are irregularly shaped, coalesced or aggregated.

(Emulsification stability)
The sample was stored at 50 ° C. for 1 month and its stability was evaluated.
○ (Good): There is no change in appearance, and the decrease or increase in viscosity or hardness is less than 25% compared to the initial value.
Δ (slightly poor): Slight oil floating at the gas-liquid interface, and a decrease or increase in viscosity or hardness of 25% or more and less than 50% are observed.
X (defect): Separation and a decrease or increase in viscosity or hardness of 50% or more are observed.

Example 12 (milky lotion)
Compounding ingredients Compounding amount (% by mass)
(1) POE (20) sorbitan stearate 0.8
(2) Polyethylene glycol stearate (100 EO) 0.1
(3) Glyceryl stearate 0.5
(4) Behenyl alcohol 0.5
(5) Stearyl alcohol 0.5
(6) Glycerin 10
(7) Sodium hyaluronate 0.005
(8) Butylene glycol 5
(9) Chelating agent 0.05
(10) Methylparaben 0.3
(11) Squalane 5
(12) Triethylhexanoin 5
(13) Citric acid 0.02
(14) Sodium citrate 0.08
(15) Alcohol 2
(16) Water residue

(Production method)
The aqueous phase and oil phase were heated to 70 ° C. and then emulsified with a homomixer and cooled.

Example 13 (cream)
Compounding ingredients Compounding amount (% by mass)
(1) POE (20) sorbitan isostearate 2.5
(2) Polyethylene glycol stearate (100 EO) 0.5
(3) Glyceryl stearate 1.2
(4) Behenyl alcohol 1.5
(5) Stearyl alcohol 1.5
(6) Glycerin 15
(7) Dipropylene glycol 8
(8) Chelating agent 0.01
(9) Phenoxyethanol 0.5
(10) Mineral oil 4
(11) Cetyl ethylhexanoate 4
(12) Pentaerystyl tetraoctanoate 4
(13) Dimethicone 3
(14) Citric acid 0.01
(15) Sodium citrate 0.09
(16) Bentonite 0.3
(17) Water residue

Claims (1)

(A) 10-25% by mass of glycerin;
(B) a surfactant composed of “polyoxyethylene sorbitan fatty acid ester”, “glycerin monofatty acid ester or glycerin monofatty acid ether”, and “polyethylene glycol stearate (100E.O.)”;
(C) one or more selected from higher alcohols having 14 to 22 carbon atoms;
An oil-in-water emulsified cosmetic, wherein the total molar concentration of (b) is 0.2 to 0.8 when the molar concentration of (c) is 1.