KR20240106559A - Composite powder and cosmetic composition containing the same - Google Patents

Abstract

According to an embodiment of the present invention, a composite powder is provided. The composite powder is an inorganic powder; A first modifier that treats the surface of the inorganic powder to make it hydrophobic; and a second modifier for surface treating the hydrophobically treated inorganic powder, and the second modifier may include dextrin fatty acid ester.

Description

Composite powder and cosmetic composition containing the same {COMPOSITE POWDER AND COSMETIC COMPOSITION CONTAINING THE SAME}

The present invention relates to composite powder and cosmetic compositions containing the same.

In general, cosmetics contain various powders such as coloring pigments, extenders, and white pigments. The powders provide effects such as adding color and complementing skin defects, and are known to play an important role in makeup and beauty. However, conventional cosmetics can be easily removed by sweat or sebum, so there is a problem that the sustainability of makeup is somewhat reduced.

To solve this problem, a method of improving water resistance by treating the surface of the powder included in cosmetics with higher fatty acids, higher alcohols, etc. to make the powder hydrophobic is receiving attention.

However, existing powders have limitations in improving water resistance, and even if water resistance is improved, they are very opaque and have the disadvantage of significantly appearing white when applied to the skin.

The purpose of the present invention is to provide a composite powder and a cosmetic composition containing the same to solve the above problems.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to an embodiment of the present invention, a composite powder is provided. The composite powder is an inorganic powder; A first modifier that treats the surface of the inorganic powder to make it hydrophobic; and a second modifier for surface treating the hydrophobically treated inorganic powder, and the second modifier may include dextrin fatty acid ester.

Additionally, the first modifier may include an alkylsilane.

In addition, the alkyl silanes include triethoxycaprylylsilane, methyltrimethoxysilane, dimethyldimethoxysilane, and dimethyldiethoxysilane. , may include one or more selected from the group consisting of phenyltrimethoxylsilane and diphenyldimethoxylsilane.

In addition, the dextrin fatty acid esters include Dextrin Palmitate/Ethylhexanoate, Dextrin Palmitate, Dextrin Myristate, Dextrin Stearate, and Dextrin Isostearate. It may include one or more species selected from the group consisting of (Dextrin Isostearate).

Additionally, the alkylsilane and the inorganic powder may be included in a weight ratio of 1:19 to 99.

Additionally, the dextrin fatty acid ester and the inorganic powder may be included in a weight ratio of 1:9 to 99.

In addition, the inorganic powder may include at least one selected from the group consisting of zinc oxide, titanium dioxide, iron oxide, zirconium oxide, silicon dioxide, manganese oxide, aluminum oxide, cerium oxide, mica, silica, mica, talc, and kaolin. You can.

According to an embodiment of the present invention, a cosmetic composition containing the composite powder is provided.

Additionally, the cosmetic composition may be used to block ultraviolet rays.

The composite powder according to the present invention can improve water resistance to sweat, sebum, etc. and improve transparency by double surface treating the surface of the inorganic powder.

In addition, the cosmetic composition according to the present invention minimizes the white clouding phenomenon and can provide excellent ultraviolet ray blocking ability and feeling of use.

In order to more fully understand the drawings cited in the detailed description of the present invention, a brief description of each drawing is provided.
Figure 1 is a diagram showing the results of an experiment to evaluate transparency.
Figure 2 is an SEM photograph of the composite powder used in Example 1 and Comparative Example 2.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. In general, the nomenclature used herein is well known and commonly used in the art. Additionally, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted. In addition, embodiments of the present invention will be described below, but the technical idea of the present invention is not limited or limited thereto and may be modified and implemented in various ways by those skilled in the art.

In this specification, when a part includes a certain element, this does not mean excluding other elements, but may further include other elements, unless specifically stated to the contrary. In this specification, the term and/or includes a combination of a plurality of related items or any one item among a plurality of related items.

According to an embodiment of the present invention, a composite powder is provided. The composite powder according to an embodiment of the present invention includes an inorganic powder; first modifier; and a second modifier, and the inorganic powder may be subjected to primary surface treatment using the first modifier and secondary surface treatment using the second modifier.

The inorganic powder is a base material for the composite powder, and the surface of the inorganic powder may be coated with a first modifier and/or a second modifier. For example, the inorganic powder may include an extender pigment, a colored pigment, a white pigment, or a pearlescent pigment.

In an embodiment, the inorganic powder includes one or more selected from the group consisting of zinc oxide, titanium dioxide, iron oxide, zirconium oxide, silicon dioxide, manganese oxide, aluminum oxide, cerium oxide, mica, silica, mica, talc, and kaolin. can do. However, it is not limited to this.

For example, the inorganic powder may be zinc oxide. Zinc oxide is not absorbed into the skin but acts on the surface and has the physical property of reflecting and dispersing ultraviolet rays, and can provide ultraviolet ray blocking power in the ultraviolet range of UVA (315 to 400 nm) and UVB (280 to 320 nm). In particular, zinc oxide may have a diameter of 100 to 1,000 nm, but is not limited thereto.

In an embodiment, the inorganic powder may be included in an amount of 80 to 99.8% by weight, specifically 85 to 99.8% by weight, based on the total weight of the composite powder, but is not limited thereto.

The first modifier can be treated on the surface of the inorganic powder to make the inorganic powder have hydrophobicity. The inorganic powder hydrophobized by the first modifier has water resistance properties against sweat, sebum, etc., and spreadability, feeling of use, etc. can be improved.

In embodiments, the first modifier may include an alkylsilane. However, it is not limited to this, and the first modifier may include various ingredients known in the art, such as higher fatty acids, higher alcohols, hydrocarbons, triglycerides, esters, silicon compounds, or fluorine compounds.

In an embodiment, the alkylsilane is triethoxycaprylylsilane, methyltrimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane. ), phenyltrimethoxylsilane, and diphenyldimethoxylsilane, and may specifically be triethoxycaprylylsilane. . However, it is not limited to this.

In an embodiment, the alkylsilane and the inorganic powder may be included at a weight ratio of 1:19 to 99, specifically 1:20 to 90, and more specifically 1:20 to 80. there is. When alkylsilane and inorganic powder are included in the above weight ratio, hydrophobization treatment can be uniformly performed on the surface of the inorganic powder, and the water resistance effect of the inorganic powder can be the best. However, it is not limited to this.

In an example, the first modifier may be included in an amount of 0.01 to 5% by weight, specifically 0.1 to 5% by weight, and more specifically 0.1 to 3% by weight, based on the total weight of the composite powder. However, it is not limited to this.

The second modifier can surface treat the inorganic powder that has been hydrophobically treated (for example, surface treated with the first modifier). The inorganic powder that has been double surface treated with the first and second modifiers may have improved water resistance and improved transparency. Additionally, double surface-treated zinc oxide can increase its UV blocking ability.

In embodiments, the second modifier may include a dextrin fatty acid ester. Dextrin fatty acid ester is an oil-soluble thickener ingredient, and the transparency of inorganic powder surface-treated with dextrin fatty acid ester can be increased and the white turbidity phenomenon, which forms a film on the skin and appears white when applied to the skin, can be minimized.

In embodiments, the dextrin fatty acid esters are Dextrin Palmitate/Ethylhexanoate, Dextrin Palmitate, Dextrin Myristate, Dextrin Stearate, and Dextrin Isostear. It may include one or more types selected from the group consisting of dextrin isostearate, and may specifically be dextrin palmitate/ethylhexanoate. However, it is not limited to this.

In an embodiment, the dextrin fatty acid ester and the inorganic powder may be included at a weight ratio of 1:9 to 99, specifically 1:15 to 90, and more specifically 1:20 to 80. there is. When dextrin fatty acid ester and inorganic powder are included in the above weight ratio, double surface treatment can be uniformly performed on the surface of the inorganic powder, and effects such as water resistance and transparency of the inorganic powder can be maximized. However, it is not limited to this.

In an embodiment, the second modifier may be included in an amount of 0.1 to 10% by weight, specifically 0.1 to 7% by weight, and more specifically 1 to 5% by weight, based on the total weight of the composite powder. However, it is not limited to this.

In an example, the first modifier may be triethoxycaprylylsilane and the second modifier may be dextrin palmitate/ethylhexanoate. Since triethoxycaprylylsilane has excellent compatibility with oils such as silicone, it can prevent powders from clumping together, improve the dispersibility of powders, and also improve water resistance. In addition, dextrin palmitate/ethylhexanoate is a component commonly used as a thickener in the industry, but the present inventors used dextrin palmitate/ethylhexanoate as a modifier to coat the surface of the powder with dextrin palmitate/ethylhexanoate. It was confirmed that the eight was implemented in a uniformly wrapping form. By forming a covalent bond with the hydroxyl group of dextrin palmitate/ethylhexanoate and the hydroxyl group on the surface of the powder, the phenomenon of coagulation due to hydrogen bonding between the powders was prevented. In other words, the composite powder in which the above two components are double-processed can maximize the dispersibility of the powder, minimize the white clouding phenomenon, and increase the UV blocking effect and water resistance.

In an embodiment, the first modifier and/or the second modifier may be treated on the surface of the inorganic powder using a coating method for inorganic powder known in the art. For example, a wet process of dispersing the first modifier and/or the second modifier and the inorganic powder in an appropriate solvent and then stirring with a homomixer, dissolving the first modifier and/or the second modifier in the solvent and then dissolving the inorganic powder A variety of coating methods can be used, including a dry spray process.

According to an embodiment of the present invention, a cosmetic composition containing a composite powder is provided.

The composite powder may include the composite powder described above. For example, the composite powder may include zinc oxide double surface-treated with triethoxycaprylylsilane and dextrin palmitate/ethylhexanoate. Double surface-treated zinc oxide can provide excellent formulation stability, water resistance, ultraviolet ray blocking ability, and feeling of use, and improved transparency can minimize white cast that occurs when the composition is applied to the skin.

In an example, the composite powder may be included in an amount of 5 to 20% by weight, specifically 5 to 15% by weight, based on the total weight of the cosmetic composition. However, it is not limited to this.

In an embodiment, the cosmetic composition may be for UV protection. Depending on the embodiment, the cosmetic composition may further include a sunscreen in addition to the composite powder. For example, the sunscreen may be a water-soluble and/or oil-soluble sunscreen. For example, the sunscreen may include a triazine-based compound, a salicylate-based compound, a benzotriazole-based compound, a benzophenone-based compound, a dibenzoylmethane-based compound, an acrylate-based compound, etc. However, it is not limited to this.

In an embodiment, the cosmetic composition may further include additives commonly used in the art, within a range that does not impair the effect of the present invention. For example, the cosmetic composition may further include thickeners, pH adjusters, isotonic agents, surfactants, stabilizers, preservatives, preservatives, disinfectants, moisturizers, blockers, antioxidants, organic pigments, inorganic pigments, fragrances, vitamins, etc. there is. The mixing amount of the above components can be easily selected by a person skilled in the art within a range that does not impair the purpose and effect of the present invention.

In an embodiment, the cosmetic composition may be provided in a formulation commonly prepared in the art. For example, cosmetic compositions include oil-dispersion formulations in which complex powder is dispersed in an oil phase, water-dispersion formulations in which complex powder is dispersed in an aqueous phase, oil-in-water (O/W), water-in-oil (W/O), and water-in-oil-in-water (W). /O/W) and oil-in-water (O/W/O) types of emulsion formulations, solubilization formulations, etc. However, it is not limited to this, and the cosmetic composition may also be provided in formulations such as solution, suspension, emulsion, solid, gel, oil, powder, paste, or foam aerosol.

In embodiments, cosmetic compositions may be manufactured into various products. For example, it can be manufactured into functional cosmetics such as nutritional cream, essence, and ampoule, or basic cosmetics such as lotion and lotion. In addition, it can be manufactured into soap, detergent, cleansing cream, cleansing water, etc., or into color cosmetics such as lipstick, lip balm, mascara, blusher, shading, highlighter, makeup base, foundation, pact, concealer, skin cover, etc. . It can also be manufactured into hair cleaning products such as shampoo, rinse, hair conditioner, hair gel, etc. Additionally, for example, it may be manufactured as a product that is attached to the skin, such as a pack, hydrogel slimming patch, etc., or may be manufactured as a product that is sprayed on the skin, such as a mist or aerosol.

[Experimental example]

Below, examples are shown to further explain the present invention in more detail, but the present invention is not limited thereto.

Preparation of examples and comparative examples

(1) Preparation of composite powder of Preparation Examples 1 and 2

A composite powder according to the present invention was prepared using the components listed in Table 1 below. The unit of ingredient content in Table 1 is weight%.

The specific manufacturing method is as follows.

Dextrin palmitate/ethylhexanoate was dissolved in isododecane solvent at a temperature of 90°C, cyclopentasiloxane was added as a solvent, and then reheated to 90°C. Afterwards, it was placed in a homogenizing mixer (PRIMIX) and stirred while adding zinc oxide or zinc oxide surface-treated with triethoxycaprylylsilane and dispersing it. At this time, stirring was performed for 5 minutes at a temperature of 90°C and a rotation speed of 7,000 rpm, and then surface treatment was performed by cooling the temperature from 90°C to 25°C while stirring at a rotation speed of 7,000 rpm. The surface-treated dispersion was removed by completely evaporating the solvents, isododecane and cyclopentasiloxane, at a temperature of 90°C, and was pulverized to obtain the composite powders of Preparation Examples 1 and 2.

(2) Preparation of Example 1 and Comparative Examples 1 to 5

Examples and comparative examples of compositions according to the present invention were prepared using the components listed in Table 2 below. The unit of ingredient content in Table 2 is weight%.

The specific manufacturing method is as follows.

After adding the composite powder to the oil phase component at room temperature, it was placed in a homomixer (HOMOGENIZING MIXER, PRIMIX) and stirred to pre-disperse. Once the composite powder was sufficiently stirred into the oil phase component, the aqueous phase component was slowly added to pre-emulsify the mixture. Afterwards, all the aqueous ingredients were added and emulsified, and after the emulsification was completed, the cosmetic compositions of Examples and Comparative Examples were completed after defoaming.

Experiment example

(1) Experimental Example 1: Evaluation of UV blocking ability, water resistance, transmittance, and transparency

The UV blocking ability, water resistance, and transparency of the examples and comparative examples were evaluated, and the results are shown in Table 3.

The experimental method is as follows. In the case of ultraviolet ray blocking ability (SPF), the samples of Examples and Comparative Examples were applied to the HD-6 plate and evaluated 15 minutes later using an SPF analyzer (UV-2000).

In addition, in the case of water resistance, the samples of Examples and Comparative Examples were applied to an HD-6 plate, and 15 minutes later, they were attached to the bottom of a 1L beaker, 600ml of tap water at 30°C was added, and then the samples were mixed at 180rpm using an azimixer. It was stirred for 30 minutes at a rotation speed of . After drying for 30 minutes, the SPF value before and after the water resistance test and the integrated value of Absorbance at 290-400 nm were compared.

Additionally, in the case of transmittance, the average value of Transmittance from 400 to 450 nm was measured using an SPF analyzer (UV-200).

In addition, in the case of transparency, the samples of Examples and Comparative Examples were applied to an HD-6 plate, respectively, and the degree of transparency was evaluated with the naked eye. The experimental results for evaluating transparency are shown in FIG. 1, and specifically, the experimental results of Example 1 and Comparative Examples 1 to 5 are shown sequentially in (a) to (f) of FIG. 1.

As a result of the experiment, it was found that Example 1 had very high SPF, water resistance, and transmittance, and was translucent, minimizing white clouding.

On the other hand, Comparative Example 1, which does not contain composite powder, was evaluated as having high transmittance and transparency, but because it did not contain composite powder with a sunscreen function, the SPF was measured very low, and water resistance was also measured very low, making it suitable for use as a sunscreen. It was confirmed that it cannot be used.

In addition, Comparative Example 2, which included only triethoxycaprylylsilane and surface-treated zinc oxide, had very low SPF, water resistance, and transmittance, and was confirmed to be somewhat opaque, causing a white clouding phenomenon.

In addition, Comparative Example 3, which included zinc oxide surface-treated with only dextrin palmitate/ethylhexanoate, was highly evaluated for SPF and water resistance, but was confirmed to be very opaque, causing a noticeable white clouding phenomenon and thus deteriorating the feeling of use.

In addition, Comparative Example 4, which separately included dextrin palmitate/ethylhexanoate as an oil phase component rather than a modifier, measured low water resistance and transmittance, and was confirmed to be opaque, causing a white clouding phenomenon.

In addition, Comparative Example 5, which included double surface-treated zinc oxide as an ingredient outside the scope of the examples of the present invention, was highly evaluated for SPF and water resistance, but was confirmed to be opaque, causing a clouding phenomenon, and thus deteriorating the feeling of use.

(2) Experimental Example 2: Evaluation of feeling of use

In order to evaluate the feeling of use for the examples and comparative examples, 30 evaluators in their 20s to 40s were asked to evaluate the items of no white cast, moisturizing feeling, freshness, no shine, spreadability, softness, and finish, and the results are shown in Table 4. indicated.

The experimental method is as follows. After the samples of the above examples and comparative examples were applied to the evaluator's skin, the evaluation items were evaluated in 5 levels based on the feeling of the evaluation items, and scores were given out of 5 in 1-point increments depending on the level. Feeling of use was evaluated by calculating the average of all scores and excluding deviations.

As a result of the experiment, Example 1 was found to have a very excellent feeling of use as the scores for no white cast, moisturizing feeling, freshness, no shine, spreadability, softness, and finish were all evaluated highly.

On the other hand, Comparative Example 1 was evaluated very low in terms of freshness, lack of shine, and finish, confirming that it is weak against skin moisture, sebum, and oil, and the sustainability of makeup is also significantly low, and the feeling of use is deteriorated.

In addition, in Comparative Examples 2 to 4, it was confirmed that the score for the no white cast item was evaluated very low, causing a problem of white spots forming on the skin. In addition, the scores for the moisturizing feeling, freshness, non-greasy feel, spreadability, softness, and finish items were also evaluated low, confirming that the feeling of use was significantly reduced.

In addition, in Comparative Example 5, the scores in the categories of no white cast, moisturizing feeling, freshness, spreadability, softness, and finish were evaluated very low, causing the problem of whitening of the skin, and it was confirmed that the overall feeling of use was also significantly poor.

(3) Experimental Example 3: Formulation stability evaluation

For the above examples and comparative examples, viscosity measurement and caking test were performed to evaluate formulation stability, and the results are shown in Table 5.

The experimental method is as follows. In the case of viscosity, the samples of the examples and comparative examples were measured at 12 rpm using LV pin 3, and the viscosity on the day of production of the composition and the viscosity after storage for 1 month at room temperature were measured.

In the case of the Caking Test, the samples of the Examples and Comparative Examples were each rotated in a centrifuge (Termostable IS-20R Model) for 15 minutes at a temperature of 25°C and a speed of 15,000 rpm, and then visually checked to see whether precipitation had occurred. did.

As a result of the experiment, Example 1 showed a slight change in viscosity over time, and no precipitation or agglomeration of the formulation occurred, showing that the formulation stability was very excellent.

On the other hand, Comparative Example 1 had a very low viscosity, resulting in poor spreadability and feeling of use, and sedimentation of the formulation occurred, confirming that the formulation stability was very poor.

Additionally, in Comparative Example 3, the viscosity changed rapidly over time, confirming that the formulation stability was not good.

In addition, in Comparative Example 4, the viscosity changed over time, and it was confirmed that the formulation stability was somewhat poor.

Additionally, in Comparative Example 5, the viscosity decreased over time, confirming that the formulation stability was somewhat poor.

(4) Experimental Example 4: Observation of composite powder using SEM

The composite powder used in Example 1 and Comparative Example 2 was photographed with a scanning electron microscope (SEM), and the results are shown in Figure 2. Specifically, Figure 2 (a) is an SEM photograph of the composite powder used in Example 1, and Figure 2 (b) is an SEM photograph of the composite powder used in Comparative Example 2.

Referring to (a) of Figure 2, it was found that the composite powder used in Example 1 had a dense structure, and the modifier was treated densely and uniformly on the surface of the inorganic powder. In other words, it was predicted that Example 1 using this composite powder would improve dispersibility, UV-blocking efficacy, and water resistance.

Referring to Figure 2 (b), the composite powder used in Comparative Example 2 had a large number of empty spaces and a less dense structure than Example 1, showing that the modifier was treated unevenly on the surface of the inorganic powder. I was able to. In other words, it could be predicted that Comparative Example 2 using this composite powder would have lower dispersibility, ultraviolet ray blocking efficacy, and water resistance than Example 1.

As the specific parts of the present invention have been described in detail above, those skilled in the art will understand that these specific techniques are merely preferred embodiments and do not limit the scope of the present invention. It will be obvious. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

Claims (9)

inorganic powder;
A first modifier that treats the surface of the inorganic powder to make it hydrophobic; and
It includes a second modifier for surface treating the hydrophobically treated inorganic powder,
The second modifier is a composite powder comprising dextrin fatty acid ester. According to claim 1,
A composite powder wherein the first modifier includes an alkylsilane. According to claim 2,
The alkyl silanes include triethoxycaprylylsilane, methyltrimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, and phenyl. A composite powder containing at least one selected from the group consisting of trimethoxysilane (Phenyltrimethoxylsilane) and diphenyldimethoxylsilane. According to claim 1,
The dextrin fatty acid esters include Dextrin Palmitate/Ethylhexanoate, Dextrin Palmitate, Dextrin Myristate, Dextrin Stearate, and Dextrin Isostearate. A composite powder containing at least one member selected from the group consisting of isostearate. According to claim 2,
The alkylsilane and the inorganic powder are included in a weight ratio of 1:19 to 99. According to claim 1,
A composite powder wherein the dextrin fatty acid ester and the inorganic powder are included in a weight ratio of 1:9 to 99. According to claim 1,
The inorganic powder is a composite comprising at least one selected from the group consisting of zinc oxide, titanium dioxide, iron oxide, zirconium oxide, silicon dioxide, manganese oxide, aluminum oxide, cerium oxide, mica, silica, mica, talc and kaolin. powder. A cosmetic composition comprising the composite powder according to any one of claims 1 to 7. According to claim 8,
The cosmetic composition is for blocking ultraviolet rays.