KR20130060468A - Cosmetic composition of w/o type comprising hydrophilic macromolecules - Google Patents

Abstract

PURPOSE: A water-in-oil type cosmetic composition containing a hydrophilic polymer is provided to ensure long-term stability using a small amount of surfactants. CONSTITUTION: A water-in-oil type cosmetic composition is stabilized by 0.05-0.1 wt% of a surfactant in an outer phase and 0.5-3 wt% of a hydrophilic polymer in an inner phase. The hydrophilic polymer is selected from a group consisting of hydroxyethylacrylate/sodium acryloyldimethyl taurate copolymer, ammonium acryloyldimethyltaurate/VP copolymer, carbomer 700, carbomer 981, and carbomer 2020. The outer phase is vegetable oil-based wax. The composition contains 0.5-2 wt% of the wax.

Description

Cosmetic composition of water-in-oil type containing hydrophilic macromolecules {Cosmetic composition of W / O type comprising hydrophilic macromolecules}

The present invention relates to a water-in-oil cosmetic composition using a small amount of a surfactant, and more particularly, to a water-in-oil emulsion cosmetic composition having excellent long-term stability even by using a small amount of a surfactant by using a hydrophilic polymer, which is a thickener, in an aqueous phase. It is about.

In the general water-in-oil type composition, a small amount of surfactant is used in the aqueous phase of the inner phase to maintain the stability of the formulation, and a large amount of a surfactant, a thickener, and a wax are used in the external phase of the oil phase. However, in order to prepare such a water-in-oil type composition, the process is complicated, and due to the use of a large amount of surfactants and waxes, there is a problem in that the texture becomes stiff and the feeling of use decreases.

On the other hand, in the oil-in-water composition, in order to maintain the stability of the formulation, a product stabilizer or a thickener has been used in addition to the surfactant, and a polymer widely used as a product stabilizer or thickener in conventional cosmetics or human products is mostly a hydrophilic polymer. Consists of. Polymers composed of hydrophilic polymers have a strong affinity with water, so they are easy to use because they are very well dispersed when used in an appropriate amount.The chains between the polymers are strongly connected, so they are easily broken even when subjected to strong shear or force from the outside. It has the property of not losing. For this reason, the amount of the polymer used to stabilize the emulsion constituting the cosmetics is increased. However, since the molecular weight is large and the structure is huge due to the physical and chemical properties of the polymer material, the stickiness may be severe as the amount of the polymer in the total content increases. In addition, when the contents are taken by hand and the interface is destroyed when applied to the skin, polymers are entangled with each other, resulting in agglomeration of polymers.

In addition, in the case of cosmetics, in order to increase moisturizing power, in general, polyhydric alcohols such as glycerin, propylene glycol, 1,3-butylene glycol, sorbitol, and the like are commonly used. There is a limit to getting.

Therefore, the use of a large amount of thickener may increase the stability of the cosmetic, but it is very limited to the practical industrial application because it decreases the feeling of use.

Republic of Korea Patent Application No. 2010-7023839

Accordingly, the present inventors have tried to find a way to improve the usability by reducing the content of surfactants and waxes used in water-in-oil type formulations and to simplify the manufacturing process. When introduced into water-in-oil type, even if a small amount of surfactant is used in the outer phase, it is possible to increase the stability of the formulation by reducing the fluidity in the emulsion while increasing dispersibility, and to provide a composition that is non-sticky and also simplifies the manufacturing process. The invention was completed.

Accordingly, it is an object of the present invention to provide a water-in-oil emulsion cosmetic composition which is excellent in long-term formulation stability and gives a unique feeling without stickiness even with the use of a small amount of surfactant in the inner phase.

In order to achieve the above object, the present invention provides a water-in-oil cosmetic composition stabilized by containing a surfactant of 0.05 ~ 0.1% by weight based on the total weight of the composition and a hydrophilic polymer in the inner phase.

The water-in-oil emulsion cosmetic composition of the present invention can be stored for a long time, and because the fluidity is smaller than that of the general emulsion water particles, the water particles spread over the skin for a long time to give a unique feeling, there is no sticky feeling great.

The present invention relates to a water-in-oil emulsion cosmetic composition in the form of a gel / oil, wherein the gel phase is prepared using a hydrophilic polymer, which is a polymer gel as an aqueous thickener, to prepare a gel phase and stabilize it through activity with a surfactant present in the outer phase. It relates to a water-in-oil emulsion cosmetic composition.

When the water-based thickener used in the conventional oil-in-water type formulation is introduced into the water-in-oil type formulation, the thickener interacts with molecules in the oil to act as a surfactant. Therefore, it is not necessary to use the surfactant in the inner phase used in the general water-in-oil formulation, and even if only a small amount of the surfactant and wax used in the amount of 1 to 5% by weight in the traumatic oil phase is used. The stability of the formulation will be improved. In addition, the use of the water-based thickener in this way can simplify the manufacturing process of the water-in-oil type composition, it is possible to derive a new feeling.

In the present invention, the hydrophilic polymer used as the aqueous phase thickener is included in the aqueous phase, which may be a hydrophilic dispersible polymer commonly used in manufacturing cosmetics, but is not limited thereto. Phosphorous hydroxyethyl acrylate / sodium acryloyl dimethyl taurate copolymer, ammonium acryloyl dimethyl taurate / V-pico polymer, carbomer 700 constituting the carbomer structure, carbomer 981, carbomer 2020, etc. Can be used.

The hydrophilic polymer is preferably contained in an amount of 0.5 to 3% by weight based on the total weight of the composition. The cosmetic composition according to an embodiment of the present invention has similar emulsion stability when the hydrophilic polymer is contained in the above range, and excellent in usability without precipitation even at room temperature. If the content is less than 0.5% by weight, the emulsion stability is inferior to the phase separation occurs, when the content exceeds 3% by weight is difficult to disperse in water, as well as a rapid drop in fluidity at room temperature is difficult to use as a cosmetic.

In the present invention, the surfactant is included in the oil phase, which is a traumatic oil, and may be a material in which silicone and sebum are combined, but is not limited thereto. Light / Pig-10 dimethicone and the like can be used.

In the composition of the present invention, the surfactant is used in an amount of 0.05 to 0.1% by weight based on the total weight of the composition, which is 10 times less than the amount of the surfactant used in the conventional water-in-oil type composition, but the content is 0.05 If the amount is less than the weight%, the effect on stability cannot be expected, so an amount of more than 0.05 wt% should be included.

In the present invention, various oils known in the art may be used for the preparation of a water-in-oil emulsion cosmetic composition, and examples thereof include silicone oils such as dimethicone or cyclomethicone; Ester oils such as cetyl ethyl hexanoate or C12-15 alkyl benzoate; Hydrocarbon-based oils such as hydrogenated polydecene, hydrogenated vegetable oils or squalanes, and mixtures thereof. The oil is preferably used in an amount of 1 to 30% by weight based on the total weight of the composition.

The water-in-oil cosmetic composition according to the present invention may use wax on an external oil, and examples thereof include, but are not limited to, vegetable oil-based waxes such as carnauba wax, candelilla wax, and beeswax. The wax may be used in an amount of 0.5 to 2% by weight based on the total weight of the composition.

In addition, the water-in-oil cosmetic composition according to the present invention may further contain auxiliary components such as pigments, flavors, and preservatives commonly used in the preparation of water-in-oil cosmetics in an amount of 0 to 1% by weight based on the total weight of the cosmetic composition. have.

The cosmetic composition according to the present invention may be prepared in any formulation commonly prepared in the art, and may be, for example, formulated as a solution, a suspension, an emulsion, a cream, or a lotion, but is not limited thereto. . More specifically, it may be prepared as a flexible lotion, nutrition lotion, nutrition cream, massage cream, essence or eye cream formulation.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto, and other applications, modifications and the like of the present invention will be apparent to those skilled in the art. Hereinafter, the present invention will be described more specifically with reference to examples and test examples. These examples are provided only for understanding the contents of the present invention, but the scope of the present invention is not limited to these examples and test examples, and modifications, substitutions, and insertions commonly known in the art may be performed. It may be included in the scope of the present invention.

Reference Example 1 Preparation of Examples 1 to 6 and Comparative Examples 1 and 2

The water-in-oil emulsions of Examples 1 to 6 and Comparative Examples 1 and 2 were prepared using the compositions shown in Tables 1 and 2 below (unit: wt%).

division Raw material name Example 1 Example 2 Example 3 Example 4 Example 5 Paid
part Glyceryl stearate 0.5 0.5 0.5 0.5 0.5 Caprylic / capric triglyceride 25 25 25 25 25 Glyceryl Behenate / Eco Sioate 0.5 0.5 0.5 0.5 0.5 Surfactants Piggy-10 Dimethicone 0.1 0.1 0.1 0.1 0.1 Awards
part Purified water Balance Balance Balance Balance Balance Disodium iodide Suitable amount Suitable amount Suitable amount Suitable amount Suitable amount Phenoxyethanol Suitable amount Suitable amount Suitable amount Suitable amount Suitable amount Tromethamine Suitable amount Suitable amount Suitable amount Suitable amount Suitable amount Butylene glycol 5 5 5 5 5 Polymer Hydroxyethylacrylate / Sodium Acryloyl Dimethyl Taurate Copolymer 1.5 - - - - Ammonium Acryloyl Dimethyl Taurate / V-Picopolymer - 1.5 - - - Carbomer 981 - - 1.5 - - Carbomer 700 - - - 1.5 - Carbomer 2020 - - - - 1.5

division ingredient Example 6 Example 7 Comparative Example 1 Comparative Example 2 Paid
ingredient Glyceryl stearate 0.5 0.5 0.5 0.5 Caprylic / capric triglyceride 25 25 25 25 Glyceryl Behenate / Eco Sioate 0.5 0.5 0.5 0.5 Hydrogenated Vegetable Oil - One - - Surfactants Cyclopentasiloxane / Disteadimonium hectorite / Pig-10 dimethicone 0.1 0.1 - 0.1 Polysorbate 20 - - 0.1 - Awards
ingredient Purified water Balance Balance Balance Suitable amount Disodium iodide Suitable amount Suitable amount Suitable amount Suitable amount Phenoxyethanol Suitable amount Suitable amount Suitable amount Suitable amount Tromethamine Suitable amount Suitable amount Suitable amount Suitable amount Butylene glycol 5 5 5 5 Polymer
(Increase) Carbomer 981 1.5 1.5 1.5 -

<Production process>

1) The oil phase component and the surfactant were mixed at 75 ° C.

2) Put all the water component in purified water and mixed.

3) The polymer was added to the mixed solution of 2) and dispersed.

4) The mixed solution of 1) was dispersed with a homogenizer.

5) The mixed solution of 3) was added to the solution of 1) and emulsified with a homogenizer.

[Test Example 1] Check the physical properties, stability and feel of the emulsion according to the polymer composition

Evaluation of the physical properties (30 days emulsification stability), smooth applicability and instant deterioration of the emulsion prepared in Examples 1-7 and Comparative Examples 1-2 were measured by the following method, the results are shown in Table 3 below It was.

Soft appetite (sensory) and immediate impairment were measured as average values of the values (five-point scale) evaluated by a professional panel test. In addition, the emulsion stability was determined by observing the oil separation and emulsion collapse of the sample stored for 30 days at a constant temperature of 30 ℃.

<Evaluation Criteria of Five-point Scale>

5 points: very much, 4 points: yes, 3 points: normal

2 points: No, 1 point: Not very.

<Emulsification Stability Evaluation Criteria>

Good: Oil does not separate at all

Medium: The oil is finely divided

Poor: Oil is separated or moisture in the interior is cut off

Evaluation items Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Comparative Example 1 Comparative Example 2 30 days oil painting stability good good good good good good good usually Bad Soft application (sensation) 5 5 5 5 5 4 4 3 3 Immediate loss of feeling 4 4 5 5 5 5 5 4 2

As can be seen from the results in Table 3, in the case of Examples 1 to 7 it was possible to obtain a cosmetic having excellent stability by using a suitable surfactant while including a polymer gel in the inner phase. This is because the gel made of polymer in the inner phase can not only reduce the fluidity of the emulsified phase to ensure stability, but also the hydrophilic portion of the surfactant in the outer phase can be expected to have higher stability through the activity between the polymer chains. However, as can be seen in Comparative Example 2, it was found that when the polymer is not used, the emulsion stability drops sharply. When the polymer is present, the stability could be maintained by the connection with the molecules in the oil phase, but without the polymer, the interaction with the molecules in the oil phase could not be seen that the stability is broken.

In addition, in Examples 1 to 7 compared to Comparative Examples 1 and 2 tends to tend to smooth smoothness and immediate deterioration. In this case, even if the polymer in the inner phase contains a high content of the polymer gel is well formed because the oil penetrates into the gel under external pressure and gently applied on the skin. In addition, since the elasticity of the cosmetic itself is increased by the polymer gel in the inner phase, a polymer film is formed on the skin, and as the oil is applied thereon, a feeling of deterioration can be given, so that the instant desensitization score is high in Examples 1 to 6. It can be seen as obtained.

Test Example 2 Measurement of Skin Irritability of Cosmetic Composition

The skin patch test was done about the cosmetic composition manufactured in Examples 1-5. The skin reactions of 15 healthy males in their 20s and 30s with no skin disease and allergic symptoms and no history of skin hypersensitivity were identified through human skin patch tests. The inner part of the forearm of the test subject was first wiped clean, and then completely dried, and 30 µg of each of the five cosmetics were sealed. After patching for 24 hours, the sample was removed, and after about 30 minutes, the test site was observed with a magnifying glass to observe skin abnormalities.

<Evaluation standard of around three points>

3 points: redness and a boil-like phenomenon, 2 points: slightly itchy

1 point: no abnormality

Evaluation items Example 1 Example 2 Example 3 Example 4 Example 5 Skin irritation One One One One One

As can be seen from the results of Table 4, the cosmetic according to the present invention was confirmed that it is safe when used in the human body does not cause skin irritation.

Claims (8)

A water-in-oil cosmetic composition stabilized by containing 0.05 to 0.1% by weight of surfactant based on the total weight of the composition and hydrophilic polymer in the inner phase. The method of claim 1, wherein the hydrophilic polymer is a hydroxyethyl acrylate / sodium acryloyl dimethyl taurate copolymer, ammonium acryloyl dimethyl taurate / V-pico polymer, carbomer 700, carbomer 981 and carbomer 2020 One or more water-in-oil cosmetic composition selected from the group consisting of. The water-in-oil cosmetic composition according to claim 1, wherein the hydrophilic polymer is contained in an amount of 0.5 to 3% by weight based on the total weight of the composition. The water-in-oil cosmetic composition according to claim 1, wherein the external wound comprises a wax. The water-in-oil cosmetic composition according to claim 4, wherein the wax is a vegetable oil wax. The water-in-oil cosmetic composition according to claim 4, wherein the wax is contained in an amount of 0.5 to 2% by weight based on the total weight of the composition. The water-in-oil cosmetic composition according to claim 1, wherein the composition comprises at least one selected from the group consisting of silicone oil, ester oil, hydrocarbon oil, and mixtures thereof on the outer phase. The water-in-oil cosmetic composition according to claim 7, wherein the oil is contained in an amount of 1 to 30% by weight based on the total weight of the composition.