KR0164261B1 - Cosmetic dye composition - Google Patents

Abstract

The present invention relates to a cosmetic composition containing a liquid crystal, and more particularly to a cosmetic composition containing a liquid crystal that minimizes skin irritation by containing a polymer silicone gum liquid crystal formed using a thickener without using a surfactant. It is about.

Description

Cosmetic composition containing polymer silicone gum liquid crystal without skin irritation

The present invention relates to a cosmetic composition containing a liquid crystal, and more particularly to a cosmetic composition containing a liquid crystal that minimizes skin irritation by containing a polymer silicone gum liquid crystal formed using a thickener without using a surfactant. It is about.

Recently, the water retention function of the stratum corneum of the skin was found to be due to the formation of a lipid double layer in the liquid crystal state of the mixture of lipid ceramide, cholesterol, etc. in the intracellular keratinocytes, mimics the principle of living body in cosmetics. A cosmetic research is ongoing.

Biofilms that play an important role in life are also basically bilayers of lipids. That is, since the liquid crystal exists in the form of lamella similar to the intercellular lipid in the lipid bilayer of the biofilm or the stratum corneum of the skin, the liquid crystal in the cosmetics is expected to play a role similar to the intercellular lipid. In addition, since the liquid crystal-containing cosmetic composition has good affinity with the skin, when used on the skin, the stratum corneum layer defense function is increased, and the skin moisturizing and softening effect is enhanced. In addition, emulsified products also have the advantage of contributing to the stabilization of the emulsion because it forms a rigid liquid crystal film of the interfacial film between the oil and water.

Here, the liquid crystal is defined as follows. In general, when an organic compound rises in temperature, the crystal structure starts to break down and is converted to isotropic where the crystal structure is completely destroyed above a certain temperature. The phase is called a meso phase, and the organic compound in this meso phase state is called a liquid crystal. Liquid crystals are classified into a thermotropic liquid crystal in which a phase change occurs with temperature, and a lyotropic liquid crystal in which a phase change occurs with a change in composition.

There are three types of thermotropic liquid crystals: smectic, nematic, and cholesteryl liquid crystals. In particular, the cholesteryl ester liquid crystal has a variety of colors depending on the temperature and the angle of light, cholesterol and its derivatives are important for the natural intercellular lipids that represent the important moisturizing function of the biological membrane, so the hydration power has a unique appearance for a long time and It has been frequently used in high value-added products with excellent moisturizing properties. However, cholesteryl ester-based liquid crystals are very oily, so they are not sticky when they are applied to the skin. They are discolored as time passes and there is an unpleasant smell of the raw material itself. Because of the thermotropic nature, the liquid crystal effect is particularly sensitive to temperature. Therefore, it appears as an oil phase that does not exhibit the liquid crystal effect at high temperature (60 ° C.), and at low temperatures (10 ° C.), crystals of liquid crystal precipitate and become cloudy. do.

On the other hand, examples of lyotropic liquid crystals that form lamellar liquid crystals that are structurally very stable based on a large amount of surfactants, oils, polyols, and the like may be liquid crystals using polymer silicon gum. The present applicant has filed a patent application for the formation of a polymer silicon gum liquid crystal (Korean Patent Application No. 1995-3282, filed February 20, 1995). According to the invention, the silicon gum liquid crystal has no smell and no stickiness. It has a very good usability, and forms a thin film on the skin to suppress transdermal moisture evaporation, so it has excellent moisturizing effect, and it is structurally very stable due to lyotropic liquid crystal, so it is always stable regardless of temperature change (0 ~ 65 ℃). It can provide an effect having a constant appearance. However, in the case of lyotropic liquid crystals, a large amount of surfactants are used for liquid crystal formation and structural stability, and these surfactants are causing factors for skin irritation.

Accordingly, the inventors of the present invention, while finding a way to reduce the amount of the surfactant that can cause the skin irritation while forming a stable liquid crystal in the cosmetic containing polymer silicone gum liquid crystal, conventional liquid crystal containing a liquid crystal By adding a thickener added to the makeup base and used to stabilize the liquid crystal in the makeup base at the time of liquid crystal formation, stable liquid crystal formation is possible without using a surfactant, and a silicone gum using the surfactant of the prior invention The present invention has been accomplished by discovering that a cosmetic composition with reduced skin irritation can be provided, which can provide the excellent properties of liquid crystal, that is, structural stability, excellent usability and the like as it is.

Accordingly, an object of the present invention is to provide a cosmetic composition containing a liquid crystal minimized skin irritation by containing a liquid crystal formed by using a thickener in the cosmetic composition containing a polymer silicon gum liquid crystal, without using a surfactant. .

In order to achieve the above object, the composition according to the present invention, (A) 5.0-50.0% by weight of a non-volatile polymer silicone gum solution; (B) 10.0 to 50.0 weight percent of a polyol; And (c) a liquid crystal formed of 0.05 to 40% by weight of an organic and inorganic thickener.

Other objects and functions of the present invention will become apparent to those skilled in the art from the following detailed description.

Hereinafter, the present invention will be described in more detail.

The polymer silicon gum liquid crystal provided in accordance with the present invention is a lyotropic liquid crystal which exhibits a liquid crystal effect according to a change in a composition having excellent usability and no smell at all.

Hereinafter, each component which comprises the polymer silicon gum liquid crystal of this invention is demonstrated.

First, the silicone gum of the polymer silicone gum solution ((a) component) has a viscosity of 1,000,000 to 15,0.

A polydimethylsiloxane in the range of 00,000 centistokes (cts), wherein the molecular weight is about 400,000 to 700,000 molecular weight of 5,000 to 9,000 units of dimethylsiloxane. The polymer silicone gum solution is obtained by dissolving a polymer silicone gum in a cyclomethicone, preferably decamethylcyclopentasiloxane, such that the weight ratio of the cyclomethicone to the polymeric silicone gum is 1:99 to 50:50.

Dimethicone, cetyldimethicone, stearyl dimethicone, etc. may be further added to the silicon gum solution in order to improve the solubility of the silicon gum.

The polyol which is (b) component can illustrate propylene glycol, 1, 3- butylene glycol, isoprene glycol glycerin, sorbitol, maltitol, sugar PEG-10 (-20) methyl glucose ether, etc.

The (C) component is used as an oil dispersion stabilizer, and has been used to stabilize liquid crystals in a cosmetic base by adding to a cosmetic base in a liquid crystal containing cosmetics. In the present invention, a thickener closely related to the stabilization of the liquid crystal is introduced and used in forming the liquid crystal. In this way, it is possible to form a liquid crystal without using a large amount of surfactants, which have been used as essential components in connection with liquid crystal formation.

Thickeners used in the formation of liquid crystals in the present invention are related to the formation and maintenance of liquid crystals, and include carboxyvinyl polymer, xanthan gum, hydroxyethyl cellulose, carboxymethyl cellulose, polyacrylamide, and glyceryl poly. Organic thickeners such as methacrylate, acrylate / alkyl acrylate crosspolymer having 10 to 30 carbon atoms, PVM (polyvinyl methyl ether) / MA (maleic anhydride) decadiene crosspolymer; Inorganic thickeners, such as sodium magnesium silicate and magnesium aluminum silicate, are mentioned, It is 1 type, or 2 or more types selected from these.

The cosmetic composition containing the liquid crystal according to the present invention has a beautiful appearance, excellent usability, and is stable to heat, and can also alleviate skin irritation since it does not use a surfactant during liquid crystal formation.

Hereinafter, the configuration and effect of the present invention will be described in more detail with reference to Examples and Test Examples of the present invention.

[Example]

[Liquid crystal manufacturing]

With the composition shown in Table 1 below, the oil component was slowly added to the aqueous component under strong stirring to form a translucent or transparent liquid crystal.

Manufacturing method

(1) Mix 1-6 uniformly.

(2) Mix 7-14 uniformly.

(3) Add slowly to A while homomixing A rule.

Example 1 and Comparative Examples 1 and 2

Table 2 below relates to a transparent product containing a liquid crystal.

Manufacturing method

(1) Mix 1-8.

(2) mix 9-10.

(3) Slowly add B to A.

(4) 11 was added to form a transparent gel.

(5) Inject 12-14 into the desired shape into D to make the final product.

Experimental Example 1

[Comparison of stability]

Table 3 is about the liquid crystals A to F obtained in the preparation example, Table 4 is to investigate the stability according to the change by temperature in order to confirm the stability for the liquid crystal containing cosmetics of Example 1 and Comparative Examples 1-2.

(Note) ◎ very good, ○ good, × separation

(Note) ◎ very good, ○ good, × separation

From Table 3 above, it can be seen that the liquid crystal according to the present invention is stable regardless of temperature change, and from Table 4 it can be seen that the gel cream of the cholesteryl ester liquid crystal is slightly degraded by heat.

[Test Example 2]

[Skin Stability Comparison]

For 20 women in their 20s and 30s, the surfactant-free liquid crystal of the present invention and the conventional surfactant-containing silicon gum liquid crystal and cholesteryl ester liquid crystal were used in the liquid crystal-containing cosmetics of Examples 1 and Comparative Examples 1 and 2. The safety (human patch test) was performed, and the results of Table 5 and Table 6 were obtained.

(Note) +++ There is a problem in using because it is very irritating.

++ Not recommended due to severe irritation.

+ Slightly irritating.

± almost no stimulation.

-No irritation at all, so it can be used for sensitive skin.

From Table 5, it can be seen that the silicone gum liquid crystal without the use of a surfactant is most safe for the skin.

(Note) +++ There is a problem in using because it is very irritating.

++ Not recommended due to severe irritation.

+ Slightly irritating.

± almost no stimulation.

-No irritation at all, so it can be used for sensitive skin.

[Test Example 3]

[Usability check]

As a result of performing the usability product name for the products of Example 1, Comparative Examples 1 to 2 for 40 women in their 20s to 30s, the results shown in Table 7 were obtained.

It can be seen from Table 7 that the usability of the silicone gum liquid crystal-containing product is much better than that of the cholesteryl ester liquid crystal-containing product, and among them, the usability of the silicone gum liquid crystal-containing product without the use of a surfactant is superior.

Claims (3)

(A) A polydimethylsiloxane having a viscosity in the range of 1,000,000 to 15,000,000 centistokes (cts), having 5,000 to 9,000 units of dimethylsiloxane, and having a molecular weight of about 400,000 to 700 5.0-50.0 weight% of polymer silicone gum solution which is 2,000; (B) 10.0-50.0 weight% of polyols; And (c) a liquid crystal formed from 0.05 to 40% by weight of a thickener. The cosmetic composition according to claim 1, wherein the polymer silicone gum solution is dissolved in a cyclomethicone such that the weight ratio of polymer silicone gum: cyclomethicone is 1:99 to 50:50. The thickener is carboxyvinyl polymer, xanthan gum, hydroxyethyl cellulose, carboxymethyl cellulose, polyacrylamide, glyceryl polymethacrylate, acrylate / alkyl having 10 to 30 carbon atoms. Cosmetic composition, characterized in that one or more mixtures selected from the group consisting of acrylate crosspolymer, PVM (polyvinyl methyl ether) / MA (maleic anhydride) decadiene crosspolymer, sodium magnesium silicate and magnesium aluminum silicate .