KR101221231B1 - Transparent oil in water type emulsified cosmetic compositions - Google Patents

Abstract

The present invention relates to an oil-in-water cosmetic composition having a transparent appearance, more specifically, it contains 2 to 6% by weight of water to show a transparent appearance and contains 40 to 90% by weight of oil and has a high viscosity that does not flow 0.1 The present invention relates to a high viscosity oil-in-water cosmetic composition having a transparent appearance containing ˜10% by weight of surfactant and having excellent phase stability and skin stability.

Clear, high viscosity, cream type, oil-in-water emulsion

Description

Transparent oil in water type emulsified cosmetic compositions

1 is a photograph measured by the digital camera the appearance of the emulsion prepared in Examples 1 to 3 and Comparative Examples 1 and 2 of the present invention.

Figure 2 is a photograph of the emulsion prepared in Example 1 of the present invention measured by a scanning electron microscope.

The present invention relates to an oil-in-water cosmetic composition having a transparent appearance, more specifically, it contains 2 to 6% by weight of water to show a transparent appearance and contains 40 to 90% by weight of oil and has a high viscosity that does not flow 0.1 The present invention relates to a high viscosity oil-in-water cosmetic composition having a transparent appearance containing ˜10% by weight of surfactant and having excellent phase stability and skin stability.

Research and reporting on the cosmetic composition of the transparent appearance as a formulation that can attract consumer attention with a differentiated appearance, but it is currently difficult to find a transparent emulsion formulation as a skin care product on the market.

In general, a method of preparing a transparent formulation has been reported to adjust the refractive index of the oil phase and the water phase similarly, to make the size of the emulsion particles very fine, to increase the content of the surfactant to make a microemulsion. In particular, high-viscosity, transparent formulations are available for haircare products using microemulsions, but in order to form microemulsions, a large amount of surfactant must be used, and it is not suitable as a skincare product because it can cause irritation when used on the skin.

In addition, a method of preparing a transparent or translucent emulsion by adjusting the refractive indices of the aqueous phase and the oil phase is known to produce a transparent formulation only when the difference in refractive index between the aqueous phase and the oil phase is 0.005 or less. However, since the difference in refractive index between water, which is the main component of the water phase, and oil, which is the main component of the oil phase, is large, an oil having a relatively low refractive index should be selected among the oils to reduce the difference between the refractive index of the aqueous phase and the oil phase. Glycerin, fatty acids, etc. should be added. However, these components used in the water phase has a problem that the emulsion stability worsens and opacity over time.

As a specific example, Unilever's patent (Korean Patent Publication No. 2001-0014168) discloses a transparent emulsion composition consisting of an aqueous layer having 2-methyl-1,3 propanediol and an oil layer containing a silicone fluid mixture. In addition, Japanese Patent (8-231336) discloses a transparent cosmetic composition comprising a polyhydric alcohol having 2 to 6 carbon atoms, an alkoxy rate polymer, a hydrocarbon having 10 to 20 carbon atoms, and silicone. All of these patents use silicone oil in the oil layer and provide a transparent cleansing cream composition.

Accordingly, the present inventors have studied a high viscosity formulation which is not limited to a specific oil such as silicone oil and can freely select and use the oil, but also shows a visually transparent appearance and does not flow down. And by adjusting the content of the oil phase to control the viscosity and to adjust the content of the surfactant was found to be able to prepare a formulation having excellent phase stability and skin stability and completed the present invention.

Accordingly, it is an object of the present invention to provide a high viscosity oil-in-water cosmetic composition having a transparent appearance that is excellent in phase stability and skin safety by containing water, oil and surfactant in a constant content.

In order to achieve the above object, the present invention is a high-viscosity oil-in-water cosmetic having a transparent appearance, characterized by containing 2 to 6% by weight of water, 40 to 90% by weight of oil and 0.1 to 10% by weight of surfactant based on the total weight of the composition. To provide a composition.

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

In the oil-in-water cosmetic composition of the present invention, the water component showing a relatively lower refractive index than the other components is the most important factor in the transparency of the formulation. Therefore, the present invention is characterized by controlling the transparency of the formulation by the water content, the water content of the water-based component of the oil-in-water cosmetic composition is preferably 2 to 6% by weight relative to the total weight of the composition. This is because if the content of water is less than 2% by weight or more than 6% by weight, the appearance becomes opaque.

The oil component of the oil-in-water cosmetic composition of the present invention is at least one selected from the group consisting of hydrocarbons, higher alcohol higher fatty acid esters, higher alcohols, higher fatty acid oils, triglycerides and silicones.

In addition, the content of the oil component in the oil-in-water cosmetic composition of the present invention is preferably 40 to 90% by weight relative to the total weight of the composition. This is because when the oil is less than 40% by weight, the viscosity of the formulation is low, so there is inconvenience in flowing down, and when it exceeds 90% by weight oil-in-water emulsion is not prepared.

The surfactant used in the present invention is a nonionic surfactant, and polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene octyldodecyl ether, polyoxyethylene cetel ether, polyoxyethylene isocetyl ether, poly Oxyethylene nonylphenyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene lanolin ether, polyoxyethylene cholesteryl ether, polyoxyethylene sorbitan oleate, polyoxyethylene sorbitan stearate, polyoxyethylene sorbitan laurate , Polyoxyethylene sorbitan palmitate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbitan tristearate, polyoxyethylene sorbitol hexaoleate, polyoxyethylene sorbitol and heptalate polyoxyethylene hydrogenated casters 1 selected from the group consisting of oils It may be used or more thereof.

In addition, the content of the surfactant in the oil-in-water cosmetic composition of the present invention is preferably 0.1 to 10% by weight based on the total weight of the composition. This is because when the content of the surfactant is less than 0.1% by weight, the stability of the formulation may not be maintained and may be separated into an oil phase and an aqueous phase, and when it exceeds 10% by weight, skin irritation may occur.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited only to these examples.

[Examples 1-3 and Comparative Examples 1-4]

According to the component and content (unit: wt%) according to Table 1 below, the aqueous phase ingredients were uniformly mixed at room temperature, the oily ingredients were mixed at room temperature, and the oil phase components were slowly added to the aqueous phase while stirring at room temperature. The emulsion compositions of Examples 1-3 and Comparative Examples 1-4 were prepared.

Ingredient (% by weight) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Paid Cetyl octanoate 38.5 36.5 34.5 40.5 33.5 19.5 27.5 Olive oil 15.0 15.0 15.0 15.0 15.0 10.0 15.0 Pentaneryltrityl
Tetraisostearate 20.0 20.0 20.0 20.0 20.0 10.0 20.0 Awards glycerin 10.0 10.0 10.0 10.0 10.0 25.0 10.0 Butylene glycol 5.0 5.0 5.0 5.0 5.0 17.0 5.0 Sorbitol 5.0 5.0 5.0 5.0 5.0 10.0 5.0 Urea 1.5 1.5 1.5 1.5 1.5 1.5 1.5 D.I. water 2.0 4.0 6.0 - 7.0 4.0 4.0 Interface
Active agent PEG-60 Cured Castor Oil 3.0 3.0 3.0 3.0 3.0 3.0 12.0

Test Example 1 Transparency According to Water Content

In order to compare the transparency of the cosmetic preparations prepared in Examples 1 to 3 and Comparative Examples 1 and 2, each prepared formulation was put in a transparent container, and then the appearance was compared using a digital camera and shown in FIG. 1. As can be seen in Figure 1, the transparency of the formulation was changed according to the water content, the formulations prepared in Examples 1 to 3 showed a transparent appearance than the formulation of Comparative Examples 1 and 2.

In addition, as a result of measuring the refractive indices of the aqueous phase and the oil phase portion, the refractive index of the oil phase portion was 1.4502, and when the water content is 2% (Example 1), the refractive index of the water phase portion is 1.4550, 4% (Example 2) 1.4487 In case of 7% (Comparative Example 2), the refractive index of the aqueous phase was changed according to the water content as 1.4446, and the appearance became opaque as the refractive index difference with the oil phase became larger. That is, when the water content of the water phase and the oil phase similar to the refractive index of 3 to 5% by weight can be prepared the most transparent formulation, the water content of the water and oil phase difference between the refractive index is 0.005 or more less than 2% by weight, or more than 7% by weight At that time, it was confirmed that an opaque appearance was produced.

Test Example 2 Viscosity According to Oil Content

The viscosity of the formulations prepared in Example 2 and Comparative Example 3 was measured using a Brookfiled viscometer. The formulation prepared in Example 2 was 35,000 cps and the viscosity of the formulation prepared in Comparative Example 3 was 5,000 cps, measured at 25 ° C. at a speed of 12 rpm. That is, in the non-flowing high viscosity transparent formulation prepared in Example 2, the viscosity can be adjusted according to the content of the oil phase and the aqueous phase, and as the content of the oil phase portion increases, the viscosity of the formulation increases and the content of the aqueous phase portion increases. It was found that the more the viscosity of the formulation is lowered.

Test Example 3 Measurement of Emulsion Particle Shape

In order to determine the shape of the emulsion particles of the transparent formulation prepared in Example 2, the emulsion particle shape was measured by a scanning electron microscope and is shown in FIG. 2. As can be seen in Figure 2, the average particle size of the formulation prepared in Example 2 was 1-2㎛, large particles of 5㎛ or more could be observed. That is, it was confirmed that the formulation prepared in Example 2 was a transparent oil-in-water (o / w) emulsifier type.

Test Example 4 Evaluation of Stability

The compositions prepared according to Examples 1 to 3 and Comparative Examples 1 to 4 were subjected to stability evaluation for the formulation. As a method of stability evaluation, the separation degree of water phase and oil phase, viscosity change, and transparency change were observed after 3 months at 4 ° C, 25 ° C, and 45 ° C after the preparation, and the results are shown in Table 2.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 4 ℃ ○ ○ ○ ○ ○ ○ ○ 25 ℃ ○ ○ ○ ○ ○ ○ ○ 45 ° C ○ ○ ○ ○ ○ △ ○ Viscosity change none none none none none none none Transparency change none none none none none none none

<Judgement criteria: ○: Good, △: Normal, X: Separation>

As can be seen in Table 2, all of the formulations prepared according to Examples 1 to 3 and Comparative Examples 1 to 4 were excellent in emulsification stability with temperature, and it was confirmed that there was no change in transparency and viscosity even during long-term storage. . In particular, in the case of oil-in-water cosmetics containing a lot of oil in general, the formulation stability may be unstable, as shown in Examples 1 to 3 it was found that the cosmetic composition of the present invention is excellent in transparency and stability. .

 Test Example 5 Evaluation of Skin Safety

In order to evaluate the skin safety according to the surfactant content of the present invention, human skin irritation tests were conducted on 30 adult men and women for Examples 1 to 3 and Comparative Example 4. In the method, the composition of Examples 1 to 3 and Comparative Example 4 was examined for 48 hours and 96 hours with a coating amount of 15 ml / chamber (Hay's chamber) inside the lower arm of the arm. It was carried out according to the ICDRG regulations, and the results are shown in Table 3 below.

division 24 hours 48 hours Mean Score (n = 30) Grade ± + ++ +++ ± + ++ +++ Example 1 - - - - - - - - 0.00 I Example 2 - - - - - - - - 0.00 I Example 3 - - - - - - - - 0.00 I Comparative Example 4 3 One - - - - - - 1.24 II

<Criterion: If the stimulus is not sure with a very weak response, the mark is indicated by ±. As the stimulus is severe and the intensity is increased, it is indicated by +, ++, +++. If no stimulus appeared, it was recorded as-, and if stimulus appeared, the number of subjects was recorded in the display column according to the degree of stimulation.>

As can be seen in Table 3, Examples 1 to 3 all have no stimulation, Comparative Example 4 with an increase in the surfactant content was found to have a weaker stimulation compared to Examples 1 to 3. In particular, in the case of the transparent formulations in general, a large amount of the surfactant is a concern of skin irritation, it was found that the cosmetic formulation of the present invention is transparent and excellent skin safety.

As described above, when the water content is 2 to 6% by weight it was confirmed that the o / w formulation of the transparent appearance can be prepared. In addition, the viscosity of the formulation can be adjusted by the content of the water phase and the oil phase component, in particular, it was possible to prepare a high viscosity formulation such as cream does not flow down when the oil content of the oil phase 40 ~ 90% by weight.

Therefore, the composition according to the present invention has a transparent appearance and high viscosity that can be visually differentiated, it is possible to produce an excellent cosmetic in terms of long-term stability and skin safety. In addition, this high viscosity transparent emulsion formulation is expected to be applied to products of oils, nourishing creams and massage creams that do not flow down as a solid oil type.

Claims (4)

In an oil-in-water cosmetic composition having a transparent appearance comprising an aqueous phase component, an oil component and a surfactant, the aqueous component contains 2 to 6% by weight of water in the aqueous phase component, and the oil component is 10,000 cps or more at 25 ° C. An oil having a viscosity of 40 to 90% by weight based on the total weight of the composition, the surfactant is contained 0.1 to 10% by weight based on the total weight of the composition, the composition is characterized in that the oil formulation does not flow as a solid oil type Cosmetic composition. delete delete delete

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