KR101232003B1 - Cosmetics composition of W/O emulsion with thixotropic property containing oil-dispersibility thixotropes - Google Patents

Abstract

The present invention relates to a water-in-oil emulsion cosmetic composition containing at least one selected from the group consisting of organo-smectites and trihydroxystearin, which are oil-dispersible flow regulators, wherein the organic smectite 0.05 to 10.0% by weight of the total weight of the cosmetic composition, the trihydroxystearin is included in 0.05 to 10.0% by weight based on the total weight of the total cosmetic composition, the weight ratio of the organic smectite: trihydroxystearin 1: 4. To 4: 1. According to the optimum composition ratio of the organic smectite and trihydroxystearin, the water-in-oil emulsion cosmetic composition according to the present invention is phase-changed to a low viscosity liquid phase when applied to the skin to give a soft coating feeling and ease of application and viscosity after application It has the effect of recovering and imparting coating uniformity. Due to the ease of application and uniformity of the table, a uniform makeup state of the pigment-containing water-in-oil foundation can be maintained and the UV blocking index of the sunscreen cosmetic containing sunscreen can be improved.

Thixotropy, oil-dispersible flow regulators, organo-smectites, trihydroxystearin, bentonite, hectorite

Description

Cosmetics composition of W / O emulsion with thixotropic property containing oil-dispersibility thixotropes}

1 is a graph showing a change in viscosity due to friction in the flow regulator of the present invention.

2 is a graph defining τ, which is a parameter for quantitatively analyzing thixotropy.

The present invention relates to an oil-in-water emulsion cosmetic composition comprising at least one selected from the group consisting of organo-smectites and trihydroxystearin, which are oil-dispersible flow regulators. It relates to a water-in-oil emulsion cosmetic composition maximized by the thixotropic effect.

Technology to control the flow of the formulation in the cosmetic field is one of the technologies that have been continuously developed and developed. In the cosmetics, the control of flowability has an important meaning that it has a low flowability in the preservation state before application, and changes to a fluid having high flowability as the friction is applied during the application, and the flowability disappears when the friction disappears. This is because it can exhibit various functions. Thixotropy effect is a phenomenon in which the cosmetics have a high flowability due to friction and the flowability decreases when the friction disappears.

Thixotropic effect can be controlled through the composition of the continuous phase, in the case of oil-in-water cosmetics, a technique for controlling the flow by the polymer material is generally known. In the case of water-in-oil cosmetics, the thixotropy effect is shown by using organo-smectites surface-treated with an inorganic thixotrope obtained from clay. There is a disadvantage in that a lower effect appears compared to the thixotropic effect of oil-in-water cosmetics. The organic smectite here is an organic compound of bentonite, hectorite or pyrophilite.

In general, the resistance to hands and skin when applying cosmetics to the skin has been pointed out as a negative factor such as stiffness or tightness. After all, the ease of application when applying the skin is recognized as one of the important factors to determine the quality of cosmetics. In particular, in the case of water-in-oil cosmetics, the ease of application is significantly lower than in oil-in-water cosmetics. This is a study on flow control agents and compositions that can be applied to oil-in-water cosmetics. The study of flow control agents and compositions is due to inadequate research. The thixotropic effect mentioned above is light application property in moisturizing cream, etc., and makeup uniformity such as foundation is applied with pigment uniformity and thin makeup film that express skin color. It can be shown as blocking efficiency.

Water-in-oil type flow regulators developed to date can be largely divided into inorganic flow regulators and organic flow regulators, and inorganic flow regulators are organically treated with surface treatment to apply smectite obtained from clay to continuous oils. Smectite can be mentioned, As an organic type flow control agent, a low melting wax, dextrin palmitate, trihydroxy stearin, etc. are mentioned.

In order to solve the above problems, the present inventors have found that by using the rheological properties of various oil-dispersible flow control agents, it is possible to find the composition and composition ratio of the flow control agent to maximize the thixotropic effect. Accordingly, an object of the present invention is a water-in-oil emulsion cosmetic composition having a thixotropic effect of the oil-in-water cosmetic composition, that is, having high flowability when applying the skin and recovering the flowability before application after application by applying the oil. To provide.

In order to achieve the above object, the present invention is a water-in-oil emulsion cosmetic composition characterized in that it contains at least one selected from the group consisting of organo-smectites and trihydroxystearin which is an oil-dispersible flow regulator To provide.

In the water-in-oil emulsion cosmetic composition of the present invention, the organic smectite is characterized in that it is disteadimonium hectorite or stearalconium hectorite.

In the water-in-oil emulsion cosmetic composition of the present invention, the organic smectite is characterized in that contained in 0.05 to 10.0% by weight based on the total weight of the cosmetic composition.

In the water-in-oil emulsion cosmetic composition of the present invention, the trihydroxystearin is characterized in that it is contained in 0.05 to 10.0% by weight relative to the total weight of the cosmetic composition.

In the water-in-oil emulsion cosmetic composition of the present invention, the organic smectite is characterized in that contained in 0.1 to 5.0% by weight relative to the total weight of the cosmetic composition.

In the water-in-oil emulsion cosmetic composition of the present invention, the trihydroxystearin is characterized in that it comprises 0.1 to 5.0% by weight relative to the total weight of the cosmetic composition.

In the water-in-oil emulsion cosmetic composition of the present invention, the weight ratio of the organic smectite: trihydroxystearin is 1: 4 to 4: 1.

Formulation of the water-in-oil emulsion cosmetic composition of the present invention is characterized in that the pigment-containing water-in-oil foundation formulation.

The formulation of the water-in-oil emulsion cosmetic composition of the present invention is characterized in that it is a sunscreen-containing sunscreen lotion or a sunscreen-containing sunscreen cream formulation.

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

Ease of application in cosmetics depends on the type and content of flow control agents included in the continuous phase. In particular, by properly utilizing the flow control agent having a thixotropic property can be made a cosmetic composition with good applicability when applied. In addition, when the viscosity is recovered after application, it can be expected to apply uniformity or high UV protection effect in makeup cosmetics or sunscreen such as foundation.

The rheological properties of cosmetics are not only important for maintaining the stability of cosmetics from external heat or physical stimuli that may occur during storage or transport after manufacture, but also very important factors for the feel and function of cosmetics. In the case of the water-in-oil emulsion cosmetic composition, a material that contributes to the rheological properties of the cosmetic is a oil-dispersible flow regulator. Such oil-dispersible flow regulators generally act as thickeners to increase viscosity in cosmetics or as emulsion stabilizers to stabilize the interface between oil and water phases. The flow regulators used in the experimental examples of the present invention are well-known oil dispersible flow regulators, organic smectite and trihydroxystearin, which are organic flow regulators, and confirmed rheological properties, ease of application, and coating uniformity of various combinations thereof. It was.

The organic smectite used in the present invention used Disteardimonium hectorite (Benetone 38V) and Stearalkonium hectorite (Benetone 27V) of Elementis, which is an organic flow regulator. Trihydroxystearin (trade name: Thixcin R) was used. Disteadimonium hectorite and stearalconium hectorite are hydrophobic substances added to the plate surface of hectorite, and they have an oily gelling property and a uniform structure in oil, so that the plate-like structure is subject to friction during application. Is broken and shows flowability (FIG. 1). On the other hand, trihydroxystearin acts as a bulking agent having a structure occupying a certain space below the melting point, and likewise has flowability due to the disturbance of the structure by friction (Fig. 1).

The content of disteadinium hectorite or stearalconium hectorite in the cosmetic composition of the present invention is 0.05-10.0% by weight, preferably 0.1-5.0% by weight based on the total weight of the total cosmetic composition. If the content is less than 0.05% by weight, the viscosity of the cosmetic is not so low that the change in flowability during application is not detected, when it is more than 10.0% by weight is too suitable for the cosmetics because the viscosity is too high after the coating and feel. Trihydroxystearin on the other hand is 0.05-10.0% by weight, preferably 0.1-5.0% by weight based on the total weight of the total cosmetic composition. In the case of the trihydroxy stearin also when the content is less than 0.05% by weight, the viscosity of the cosmetic is too low to detect a change in flowability during application, if it is more than 10.0% by weight because the viscosity is too high to feel stuffy after application Not suitable as a cosmetic

In the present invention, the optimum combination of the above-described flow regulators to provide a water-in-oil emulsion cosmetic composition excellent in thixotropic effect. The combination of flow regulators will comprise at least one of organosmectite and trihydroxystearin, but the thixotropy effect is better if both are included. When all are included, the mixture of the flow control agent is contained in an amount of 0.1-20.0 wt%, preferably 0.2-10.0 wt%, based on the total weight of the cosmetic composition of the present invention. At this time, when the weight of the mixture is less than 0.1% by weight relative to the total weight of the composition, the viscosity is too low to observe the change in flowability, and when it exceeds 20.0% by weight, it is not suitable for cosmetics due to excessive increase in viscosity.

The cosmetic composition of the present invention is preferably suitable for makeup cosmetics or sunscreens such as foundations containing pigments expressing skin color, but can be prepared and used according to the application as products of general creams and lotions.

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

Experimental Example 1 Experiment of Confirming Effect of Tixotropy According to Composition Ratio of Oil Dispersible Flow Control Agent

The above-mentioned flow regulators were mixed as shown in Table 1 below to prepare an emulsion, and the results as shown in Table 2 below were obtained.

Table 1 shows the proportion of each oil-dispersible flow control agent mixed and the weight of each combination is 5% by weight relative to the total weight of the total cosmetic composition.

Flow regulator Disteadimonium hectorite Stearalconium hectorite Trihydroxystearin product name Bentone 38V Bentone 27V Thixcin R One One 2 One 3 One 4 One 9 5 One 8 6 One 7 7 One 6 8 One 5 9 One 4 10 One 3 11 One 2 12 One One 13 2 One 14 3 One 15 4 One 16 5 One 17 6 One 18 7 One 19 8 One 20 9 One 21 One 9 22 One 8 23 One 7 24 One 6 25 One 5 26 One 4 27 One 3 28 One 2 29 One One 30 2 One 31 3 One 32 4 One 33 5 One 34 6 One 35 7 One 36 8 One 37 9 One

Table 2 shows the thixotropy parameter τ (FIG. 2) introduced for the quantitative analysis of thixotropy for each mixing ratio of Table 1. τ is defined as the ratio of the rising slope (tanΘ ₂ ) of the viscosity recovered by reducing the stress against the falling slope (tanΘ ₁ ) while increasing the stress in the stress sweep test using the rheometer ( τ = tanΘ ₂ / tanΘ ₁ ). 2 is the log scale of stress, and the Y axis is the log scale of viscosity. The trend line is inferred from the slope (tanΘ) calculated by the least-square method when the X-axis (stress) is 20 Pa-100 Pa.

No. tanΘ ₁ tanΘ ₂ τ One 1.7320508 0.5317094 0.3069826 2 1.9626105 0.6008606 0.3061538 3 1.3763819 0.3443276 0.2501687 4 1.482561 0.3639702 0.245501 5 1.428148 0.4040262 0.2829022 6 1.6642795 0.4663077 0.2801859 7 1.7320508 0.4877326 0.2815925 8 2.1445069 0.6494076 0.3028237 9 2.4750869 0.9325151 0.3767606 10 2.3558524 0.9656888 0.4099106 11 2.3558524 0.8390996 0.3561767 12 2.6050891 One 0.383864 13 3.0776835 1.1106125 0.3608599 14 3.4874144 1.482561 0.4251175 15 2.7474774 1.1917536 0.4337628 16 2.4750869 0.7535541 0.3044556 17 2.2460368 0.6745085 0.3003105 18 2.1445069 0.5773503 0.2692229 19 1.9626105 0.5773503 0.2941747 20 1.6642795 0.5095254 0.3061538 21 1.428148 0.3443276 0.2411008 22 1.3763819 0.4142136 0.3009438 23 1.6976631 0.4769755 0.2809601 24 1.767494 0.4985816 0.2820839 25 2.1841894 0.6543817 0.2995993 26 2.5648674 0.9623215 0.3751935 27 2.378906 0.9522871 0.4003046 28 2.3331748 0.8331686 0.3570965 29 2.5001784 0.9556208 0.382221 30 2.8878277 1.0034968 0.3474919 31 3.1910039 1.2526784 0.3925656 32 2.6050891 1.0355303 0.3975028 33 2.3558524 0.7002075 0.2972205 34 2.2673035 0.687281 0.303127 35 1.9047193 0.5657728 0.2970373 36 2.0503038 0.5773503 0.2815925 37 2.1445069 0.6494076 0.3028237

The thixotropy effect was quantitatively analyzed using a rheometer with water-in-oil emulsion formulations in which two or more oil-dispersible flow regulators were combined in Tables 1-37. As a result, as shown in Table 2, No. When having a composition (1: 4 to 4: 1) of 9 to 15, 26 to 32, it was found that the thixotropic effect is superior to other ratios or when using one type of flow regulator.

<Example 1-3> Preparation of water-in-oil foundation containing pigment

As shown in the experimental example, disteadimonium hectorite (Bentone 38V) and trihydroxystearin (Thixcin R) were Bentone 38V: Thixcin R = 3: 1, A foundation was prepared by blending in proportions (Example 1). In addition, a foundation containing only one type of flow control agent was prepared to demonstrate better coating uniformity of the foundation containing the two flow control agents in a specific ratio (Examples 2 and 3). Comparative Example 1 is a foundation containing no flow regulator at all.

Table 3 below shows the compositions of Examples 1, 2, 3 and Comparative Example 1 which are water-in-oil emulsion (O / W formulation) formulations, and the unit is% by weight.

division Raw material name Example 1 Example 2 Example 3 Comparative Example 1 Paid
ingredient Decamethylcyclopentasiloxane (cyclomethicone) 30.00 Paid
ingredient Dicaprylyl carbonate 10.00 Emulsifier Cetyl Fiji / Fifiji-10 / 1 Dimethicone 2.00 Emulsifier Sorbitan isostearate 1.00 Usability Wax Beads wax 3.20 Flow regulator Dystearmonium hectorite (Bentone 38V) 2.40 3.20 - - Flow regulator Trihydroxystearin
(Thixcin R) 0.80 - 3.20 - coloring agent Titanium oxide 10.80 coloring agent CI77491 q.s. coloring agent CI77492 q.s. coloring agent CI77499 q.s. coloring agent Polymethylmethacrylate 4.50 Preservative Paraoxybenzoic acid ester
(antiseptic) q.s. solvent Purified water To 100 Emollient Butylene Glycol 10.00 Ion Blocker Disodium iodide 0.05 Emulsifying Stabilizer Sodium chloride 1.00 Preservative Phenoxyethanol (preservative) q.s.

<Experimental Example 2> Check the thixotropic effect, ease of application and uniformity of Examples 1, 2, 3 and Comparative Example 1

Thixotropy effect and the results for the ease of application and application uniformity of the pigment through a professional panel test are shown in Table 4 below. The thixotropic effect was determined based on the same τ value as introduced in Experimental Example 1, and the coating uniformity and ease of application were determined by scoring a perfect score of 5 points through a specialized panel test. When one or more oil-dispersible flow regulators were included (Example 1-3), the thixotropy effect, ease of application and uniformity of coating were relatively higher than those of only wax (Comparative Example 1). In the case of Example 1 containing a specific ratio, compared to Examples 2 and 3 using only a single type of flow regulator showed a superior thixotropy effect, ease of application and coating uniformity.

division Thixotropic effect Ease of application (5 points) Coating uniformity (5 points) Example 1 good 4.8 4.6 Example 2 usually 3.9 3.5 Example 3 usually 4.1 3.3 Comparative Example 1 Bad 3.1 2.8

<Example 4-6> Preparation of water-in-oil type sunscreen lotion containing a sunscreen

The ratio of Bentone 27V: Thixcin R = 3: 1, which is a ratio of a dispersible flow control agent having excellent thixotropy effect, was found in stearalconium hectorite (Bentone 27V) and trihydroxystearin (Thixcin R) in the above experimental example. Sunscreen lotion was prepared by blending with (Example 4). In addition, in order to demonstrate better coating uniformity of the sunscreen lotion containing the two flow control agents in a specific ratio, a sunscreen lotion containing only one type of flow control agent was prepared (Examples 5 and 6). Comparative Example 2 is a sunscreen lotion containing no flow control agent.

Table 5 below shows the compositions of Examples 4, 5, 6 and Comparative Example 2, which are water-in-oil emulsion (O / W formulation) formulations, with units by weight.

division Raw material name Example 4 Example 5 Example 6 Comparative Example 2 Paid
ingredient Decamethylcyclopentasiloxane (cyclomethicone) 20 Paid
ingredient Dicaprylyl carbonate 10 Paid
ingredient C12-15 Alkylbenzoate 10 Sunscreen Ethylhexylmethoxycinnamate 5 Emulsifier Cetyl Fiji / Fifiji-10 / 1 Dimethicone 2 Emulsifier Sorbitan isostearate One Usability Wax Beads wax 2.4 Flow regulator Stearalconium hectorite
(Bentone 27V) 1.8 2.4 - - Flow regulator Trihydroxystearin
(Thixcin R) 0.6 - 2.4 - Sunscreen Microtitanium oxide
Stearic Acid 5 Sunscreen Zinc oxide / triethoxycaprylylsilane 3 Preservative Paraoxybenzoic acid ester
(antiseptic) q.s. solvent Purified water To 100 Emollient Butylene Glycol 10 Ion Blocker Disodium iodide 0.05 Emulsifying Stabilizer Sodium chloride One Preservative Phenoxyethanol (preservative) q.s.

Experimental Example 3 Thixotropic Effects, In-vitro SPF and In Vitro PFA Identification of Examples 4, 5, 6 and Comparative Example 2

In vitro SPF and PFA measurement results using the thixotropic effect and the Win SPF measuring device of Examples 4, 5, 6 and Comparative Example 2 are shown in Table 6 below. When one or more oil-dispersible flow regulators were included (Example 4-6), the thixotropy effect and in vitro SPF and PFA were relatively higher than those used only with wax (Comparative Example 2). In the case of Example 4 containing a specific ratio showed a more excellent thixotropic effect and UV blocking ability compared to Examples 5 and 6 using only a single type of flow regulator.

division Thixotropic effect In vitro SPF In vitro PFA Example 4 good 25.06 10.27 Example 5 usually 18.33 6.97 Example 6 usually 16.54 6.18 Comparative Example 2 Bad 15.89 6.03

As described above, the composition of the water-in-oil cosmetics of the present invention exhibits the maximized thixotropy effect by using an optimum combination of organic smectite and trihydroxy stearin, which are oil-dispersible flow regulators, and more specifically, ease of application such as foundation and It shows the effect of increasing the UV blocking efficiency by coating uniformity of pigment and coating uniformity of sunscreen.

Claims (9)

Organo-smectites, an oil-dispersible flow regulator, which is one or more of disteadimonium hectorite and stearalconium hectorite; And trihydroxystearin; The weight ratio of the organic smectite: trihydroxy stearin is 1: 4 ~ 4: 1 water-in-oil emulsion cosmetic composition having a thixotropy property. delete The water-in-oil emulsion cosmetic composition of claim 1, wherein the organic smectite is contained in an amount of 0.05 to 10.0% by weight based on the total weight of the cosmetic composition. The water-in-oil emulsion cosmetic composition of claim 1, wherein the trihydroxystearin is contained in an amount of 0.05 to 10.0% by weight based on the total weight of the total cosmetic composition. The water-in-oil emulsion cosmetic composition according to claim 1, wherein the organic smectite is included in an amount of 0.1 to 5.0 wt% based on the total weight of the cosmetic composition. The water-in-oil emulsion cosmetic composition according to claim 1, wherein the trihydroxystearin is contained in an amount of 0.1 to 5.0% by weight based on the total weight of the total cosmetic composition. delete The water-in-oil emulsion cosmetic composition according to any one of claims 1 and 3 to 6, wherein the formulation of the water-in-oil cosmetic composition is a pigment-containing water-in-oil foundation formulation. The water-in-oil emulsion cosmetic composition according to any one of claims 1 to 3, wherein the formulation of the water-in-oil cosmetic composition is a sunscreen-containing sunscreen lotion or a sunscreen-containing sunscreen cream formulation. .

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