KR102342903B1 - Light screening cosmetic composition comprising cerium oxide - Google Patents

Abstract

It relates to a light-blocking cosmetic composition comprising cerium oxide, wherein the light-blocking cosmetic composition according to an aspect uniformly applies cerium oxide to each phase of an aqueous phase or an oil phase so that cerium oxide is uniformly present in any phase when applied. It has a high-functional light-blocking effect compared to its content without the need for a separate existing organic/inorganic UV-blocking component. In addition, it has a light feeling of use without stickiness as a non-existing water-in-oil formulation, and has the effect of improving cloudiness, irritation, and dryness.

Description

Light screening cosmetic composition comprising cerium oxide

It relates to a cosmetic composition for light blocking comprising cerium oxide.

There are visible rays, ultraviolet rays, infrared rays, etc. depending on the wavelength of sunlight, and most of the infrared rays reaching the ground are near infrared rays. As is known, UV rays are divided into UVA and UVB, and there is a problem in that they penetrate the skin and accelerate aging. Near-infrared radiation penetrates into the subcutaneous fat layer, which is much deeper than UVA, which reaches the deep dermis, causing destruction of collagen tissue, generation of active oxygen, as well as vasodilation, leading to fundamental skin aging such as loss of elasticity. In addition, blue light in the visible light region has a higher penetration power than ultraviolet light, so it can be a direct cause of photoaging.

Existing organic sunscreens cause skin irritation when the content is increased, and the feeling of use is also sticky and oily, which is not good. In addition, those used as conventional inorganic sunscreens have relatively few problems, but in the case of titanium dioxide, there is a problem that causes a cloudiness or has a high bluishness and a stiff feeling, and zinc oxide is a heavy metal including nanoparticles There is also an issue, so caution is always required when using it.

Recently, to improve this problem, a light blocking agent containing a rare earth metal oxide such as cerium oxide has been developed (Korean Patent No. 10-1861985), but most of it is manufactured in a water-in-oil formulation, so it feels heavy and stuffy. Also, cerium oxide is used in cosmetics Since it is not evenly dispersed in the composition, it is difficult to expect a high light-blocking effect, and there has been a problem of poor formulation stability.

Therefore, there is a need for a high-functional light blocking agent that applies cerium oxide as a formulation rather than a water-in-oil formulation, but exhibits excellent light blocking effect compared to the same content even without a separate organic/inorganic UV blocking component.

One aspect is to provide a light-blocking cosmetic composition comprising a cerium oxide dispersion, wherein the composition is an oil-in-water, water-dispersion, or oil-dispersion type composition.

Another aspect is to provide a method for preparing a cosmetic composition for light blocking comprising the step of mixing a cerium oxide dispersion with an aqueous phase, an oil phase, or a mixture thereof.

One aspect provides a light-blocking cosmetic composition comprising a cerium oxide dispersion, wherein the composition is an oil-in-water, water-dispersion type, or oil-dispersion type composition.

The term “cerium oxide” is an inorganic powder, and refers to an oxide of cerium corresponding to a rare earth metal, CeO ₂ , Ce ₂ O ₃ , Ce ₃ O ₄ and the like. For example, it may be _{CeO 2 .} When cerium oxide according to an aspect is used as a light-blocking component, problems such as dryness or cloudiness pointed out as disadvantages of conventional sunscreens using inorganic powders such as titanium dioxide and zinc oxide can be improved.

The term “cerium oxide dispersion” may refer to a dispersion in which cerium oxide powder is dispersed in an aqueous phase or an oil phase. In one embodiment, the cerium oxide dispersion may be one in which the surface-modified cerium oxide is dispersed in an aqueous phase or an oil phase. In one embodiment, the cerium oxide may be surface-modified with one or more selected from the group consisting of polyacrylic acid, glutamic acid, tromethamine, and stearic acid. The term “water-dispersion type cerium oxide” refers to a hydrophilic material, for example, polyacrylic acid, glutamic acid, and cerium oxide surface-modified with one or more selected from the group consisting of tromethamine to allow water dispersion. , which means, for example, dispersed in purified water, polyhydric alcohol, etc., can be used interchangeably with the term “water-dispersed cerium oxide”. Likewise, the term “oil-dispersion type cerium oxide” refers to hydrophobic substances such as stearic acid, aluminum stearate, alumina, polyhydroxystearic acid, triethoxycaprylylsilane, and laurel to enable oil dispersion. An oil phase, for example, C12-15 alkylbenzoate, coco-caprylate caprate, octyldodecane, cetylethylhexanoate, iso It means that it is dispersed in nonylisononanoate, cyclopentasiloxane, silicone, ester-based oil, etc., and can be used interchangeably with the term “oil-dispersed cerium oxide”. The cerium oxide dispersion may be used directly or supplied from a manufacturer. For example, it may be a dispersion prepared so that the cerium oxide is dispersed in the aqueous phase in an amount of about 30% by weight. Alternatively, it may be a dispersion prepared so that the cerium oxide is dispersed in the oil phase in an amount of about 40% by weight. When the cerium oxide dispersion according to one aspect is used, formulation stability is higher than when cerium oxide is applied as a powder itself, and cerium oxide can be evenly distributed in the aqueous phase or oil phase, thereby exhibiting an excellent light blocking effect compared to the same content of cerium oxide can The term “hydrophobic surface-treated cerium oxide” refers to a cerium oxide powder surface-modified with a hydrophobic material to enable oil dispersion, for example, may be surface-modified with stearic acid.

The term “light” may refer to a region of light including visible light, ultraviolet light, or infrared light, and may be, for example, blue light, UVA, UVB, or near infrared light. The term “light blocking” may mean physically or chemically blocking light, including visible light, ultraviolet light, and infrared light.

The "composition" may be a formulation of any one of an oil-in-water type, a water dispersion type, and an oil dispersion type. The term “oil-in-water (O/W)” is used interchangeably with the term “oil-in-water emulsion” and is one of the emulsification methods in which water and oil are mixed. It means the form in which the oil phase is dispersed. The term "water-in-oil (W/O)" is used interchangeably with "water-in-oil emulsion", and is one of the emulsification methods in which water and oil are mixed. It means the form in which the aqueous phase is dispersed. The term "water-dispersion type" refers to a form in which solid particles or powders are dispersed in a liquid aqueous phase, and for example, may be in a form in which cerium oxide powder is dispersed in an aqueous phase. The term “oil-dispersion type” refers to a form in which solid particles or powders are dispersed in a liquid oil phase, and, for example, may be a form in which cerium oxide powder is dispersed in an oil phase.

In one embodiment, when the composition is oil-in-water, the cerium oxide may be present in an aqueous phase and an oil phase. Specifically, when the composition is an oil-in-water type, the cerium oxide may be present simultaneously in an aqueous phase and an oil phase. In the oil-in-water composition according to an aspect, when the cerium oxide is present in the aqueous phase and the oil phase at the same time, the cerium oxide is uniformly present in any phase when the product is applied, thereby exhibiting a high-functional light-blocking effect compared to the same content.

In one embodiment, when the composition is an aqueous dispersion type, the cerium oxide may be present only in the aqueous phase. When the cerium oxide is present in the aqueous phase in the aqueous dispersion composition according to an aspect, the cerium oxide is uniformly present in the entire composition when the product is applied, thereby exhibiting a high-functional light-blocking effect compared to the same content.

In one embodiment, when the composition is an oil dispersion type, the cerium oxide may be present only in the oil phase. When the cerium oxide is present in the oil phase in the oil-dispersion composition according to an aspect, the cerium oxide is uniformly present in the entire composition when the product is applied, thereby exhibiting a high-functional light-blocking effect compared to the same content.

In one embodiment, the composition is in addition to the cerium oxide dispersion It may further include an aqueous phase component, an oil phase component, powder, or a combination thereof. The aqueous phase component may be included in an amount of 30 to 60% by weight based on the total weight of the composition. The oily component may be included in an amount of 1 to 15% by weight based on the total weight of the composition. The powder may not be included or may be included in an amount of 1 to 5% by weight based on the total weight of the composition. The amount of the cerium oxide dispersion may vary depending on the desired degree of light blocking, and a small amount may be included. In order to give an effect, in general, it may be included in an amount of 10% by weight or more based on the total weight of the composition.

The “aqueous component” may include purified water, polyhydric alcohol, alcohol, water phase thickener, emulsion stabilizer, water-soluble emulsifier, or other additives. The “polyhydric alcohol” is also referred to as a polyol, and refers to an alcohol having two or more hydroxyl groups. The polyhydric alcohol includes those commonly used in the art, for example, the polyhydric alcohol is glycerin, mannitol, xylitol, sorbitol, glycol alcohols such as butylene glycol, propylene glycol, diethylene glycol, It may be dipropylene glycol, polyethylene glycol, or the like. The "aqueous thickener" may be gellan gum, xanthan gum, cellulose gum, starch, montmorillonite, hectoria, bentonite, silicate, kaolin, zeolite, and the like. The "emulsion stabilizer" is a composite material containing a polymer such as (poly)acrylate, polyvinyl alcohol, polypropylene, etc., and may be one that helps in stabilization separately from the surfactant while having a thickening effect. The “water-soluble emulsifier” may be polysorbate-based, alcohol-based, glyceryl-based, stearate-based, oleate-based, or the like. The "other additives" may be preservatives, fragrances, metal ion inhibitors, anti-caking agents, metal salts, and the like.

The “oily component” may include a surfactant, an organic sunscreen, an oil thickener, or oil and other oil-soluble substances. The “surfactant” may serve as an emulsification auxiliary or dispersing agent separately from the water-soluble emulsifier, and may be, for example, acids, sorbitans, or the like. The “organic sunscreen” is ethylhexylmethoxycinnamate, ethylhexyl salicylate, bis-ethylhexyl leazine, benzophenone, paraanimobenzoic acid, butylmethoxydibenzoyl Methane, octocrylene, 4-methylbenzylidene camphor, octylmethoxycinnamate, etc. may include those generally used as sunscreens in the art. The "oil thickener" is a wax, resin, or thickener, and includes vegetable waxes such as castor wax, carnauba wax, jojoba wax, and shea butter; animal waxes such as beeswax and lanolin; mineral waxes such as ceresin, paraffin, and petrolatum; Silicon wax or resin such as stearyl dimethicone and polysilicon; may be, and the thickener may be acrylates, metal salts, clays, and the like. The “oil and other oil-soluble substances” are not limited as long as they are used in a cosmetic composition to impart moisturizing power or fluidity, for example, trimethicone, dimethicone, phenyltrimethicone, cyclohexasiloxane, cyclopentasiloxane silicone oils such as; hydrocarbon-based oils such as liquid paraffin, squalane, mineral oil, and triglycerin; natural oils such as olive oil, macadamia nut oil, and sunflower oil; Dipentaerythrityl hexaC5-9 acid ester, C12-15 alkyloctanoate, myristyl lactate, cetylethylhexanoate, neopentylglycol dicaprate, cetyloctanoate, isopropylmyristate, octyldodecyl Myristate, hexyllaurate, di(C12-C13)alkyl maleate, myristyllactate, octyldodecylstearoylstearate, diisotearylmalate, pentaerythyltetraethylhexanoate, diglyceryl tri It may include an ester-based oil such as isotearate (diglyceryl triisostearate).

The “powder” may include other powders, inorganic sunscreen agents, hydrophobic surface-treated cerium oxide, or cerium oxide. The above “other powders” are talc, mica, synthetic mica, sericite, silica, silicon-based powder, boron powder, nylon powder, polymethacrylate powder, urethane powder, acrylate (co)polymer, polyethylene (co)polymer, organic-based It may be a pigment pigment, an inorganic pigment pigment, a pearlescent pigment, etc. The “inorganic sunscreen” may be titanium dioxide or zinc oxide, and may be coated with silica, stearic acid, silicon, or the like.

In one embodiment, the cerium oxide may be included in an amount of 2 to 50% by weight based on the total weight of the composition. For example, 2-40 wt%, 2-30 wt%, 2-20 wt%, 2-10 wt%, 5-50 wt%, 5-40 wt%, 5-30 wt%, 5-20 wt% %, 5-10 wt%, 10-50 wt%, 10-40 wt%, 10-30 wt%, 10-20 wt%, 20-50 wt%, 20-40 wt%, 20-30 wt%, 30 to 50% by weight, 30 to 40% by weight, 40 to 50% by weight. If the content of cerium oxide is less than 2% by weight, it is difficult to expect a light-blocking effect alone without a separate light-blocking component, and if it exceeds 50% by weight, formulation stability is reduced.

The composition may further include one or more cosmetically acceptable carriers in addition to the components described above. Specifically, fatty substances, organic solvents, solubilizers, thickeners, gelling agents, emollients, antioxidants, suspending agents, stabilizers, foaming agents, fragrances, surfactants, water, ionic or nonionic emulsifiers, fillers, sequestering agents Agents and chelating agents, preservatives, vitamins, blocking agents, wetting agents, essential oils, dyes, pigments, hydrophilic or lipophilic actives, lipid vesicles or any other ingredients commonly used in cosmetics, as well as adjuvants commonly used in the cosmetic field It can be prepared containing. The blending amount of the additional component 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, and the blending amount is from about 0.001 to about 30 wt%, specifically from about 0.01 to about 30 wt%, based on the weight of the composition about 10% by weight.

The composition may be prepared in a cosmetic formulation conventionally prepared in the art. Specifically, it may be formulated as a solution, suspension, emulsion, paste, gel, cream, lotion, powder, soap, surfactant-containing cleansing oil, powder foundation, emulsion foundation, wax foundation, or spray. Product types are lip rice, lip cream, lipstick, lip gloss, hair stick, flexible lotion, nourishing lotion, milk lotion, emulsion, serum, nourishing cream, moisture cream, massage cream, essence, eye cream, cleansing cream, cleansing foam, cleansing water. , pack, spray, powder, liquid foundation, or solid foundation. For example, it may be a sun cream, sun stick, sun lotion, sun gel, sun powder, sun cushion, sun spray.

Another aspect provides a method for preparing a cosmetic composition for light blocking comprising the step of mixing the cerium oxide dispersion with an aqueous phase, an oil phase, or a mixture thereof.

In the manufacturing method, cerium oxide, cerium oxide dispersion, light, light blocking, the composition is as described above.

When the composition is oil-in-water, mixing an aqueous phase component; adding water-oxidized cerium dioxide to the mixed aqueous phase component; And it can be prepared in the step of emulsifying by adding a mixture of the oil phase component and the oil-dispersed cerium dioxide to the mixture.

When the composition is an aqueous dispersion type, mixing an aqueous phase component; It can be prepared by adding water-oxidized cerium dioxide to the mixed aqueous phase component.

When the composition is an oil dispersion type, mixing an oil phase component; adding oil-dispersed cerium dioxide to the mixed oily component; And it may be prepared by mixing the polyhydric alcohol and alcohol, and other additives.

In one embodiment, the cerium oxide dispersion may be one in which the surface-modified cerium oxide is dispersed in an aqueous phase or an oil phase. In one embodiment, the cerium oxide dispersion may be obtained by dispersing the surface-modified cerium oxide in an aqueous phase or an oil phase. In one embodiment, before the step of adding the cerium oxide dispersion to an aqueous phase, an oil phase, or a mixture thereof, the method may further include dispersing the surface-modified cerium oxide in an aqueous phase or an oil phase. Alternatively, in one embodiment, it may further include the step of surface-modifying the cerium oxide before the step of adding the cerium oxide dispersion to an aqueous phase, an oil phase, or a mixture thereof. According to one aspect, formulation stability can be improved through the pretreatment process of oil dispersion or water oxidation of the surface-modified cerium oxide, and since cerium oxide can be evenly distributed in all phases, excellent light blocking effect can be achieved even with a small content of cerium oxide. Therefore, it is possible to exclude the existing organic/inorganic sunscreen ingredients, thereby improving the feeling of use.

The cosmetic composition for light blocking according to an aspect uniformly applies cerium oxide to each phase of the aqueous phase or oil phase, so that cerium oxide is uniformly present in any phase when applied, so that it has high functionality compared to the content without a separate existing organic/inorganic UV blocking component. It has a light blocking effect. In addition, it has a light feeling of use without stickiness as a non-existing water-in-oil formulation, and has the effect of improving cloudiness, irritation, and dryness.

Hereinafter, the present invention will be described in more detail through examples. However, these examples are for illustrative purposes only, and the scope of the present invention is not limited to these examples.

The following [Table 1] shows the specific components and contents of the cosmetic compositions of Examples 1 to 4 and Comparative Examples 1 to 8, and the specific manufacturing method is as follows.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Awards Purified water TO 100 TO 100 TO 100 - TO 100 TO 100 TO 100 TO 100 TO 100 TO 100 TO 100 TO 100 polyhydric alcohols and alcohols 10.00 7.00 14.00 10.00 7.00 7.00 7.00 7.00 7.00 7.00 7.00 7.00 water thickener 0.30 0.30 0.50 - 0.10 0.10 0.30 0.30 0.30 0.30 0.30 0.30 Emulsion stabilizer and water-soluble emulsifier 0.60 0.60 0.30 - - - 0.60 0.60 0.60 0.60 0.60 0.60 other additives appropriate amount appropriate amount appropriate amount appropriate amount appropriate amount appropriate amount appropriate amount appropriate amount appropriate amount appropriate amount appropriate amount appropriate amount dispersion Water dispersion type cerium oxide 16.70 26.67 57.00 - - 26.67 - - - - 57.00 - Oil dispersion type cerium oxide 12.50 20.00 - 45.00 - 20.00 - - - - - 45.00 powder other powders 2.00 3.00 2.50 4.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00 inorganic sunscreen - - - - 10.00 - 10.00 - 16.00 - - - Hydrophobic surface treatment cerium oxide - - - - - - - - - 8.00 - - cerium oxide - - - - - - - - - 8.00 - - paid Surfactants 2.60 2.60 - 0.50 3.50 3.50 2.60 2.60 2.60 2.60 2.60 2.60 organic sunscreen - - - - 11.50 - 11.50 22.50 - - - - oil thickener - - - - 0.80 1.00 - - - - - - Oils and other oil-soluble substances 7.00 2.00 - 2.00 25.00 6.00 5.50 5.50 14.00 14.00 14.00 2.00 action process oil in water oil in water water dispersion oil dispersion water in oil water in oil oil in water oil in water oil in water oil in water oil in water oil in water

Examples 1 and 2. Preparation of water-oxidized and oil-dispersed cerium oxide-containing oil-in-water cosmetic composition

After mixing all the components of the aqueous phase, the aqueous dispersion type cerium oxide (water-dispersed cerium oxide) (Soulbrain), which is a dispersion in which cerium oxide is dispersed in the aqueous phase in an amount of about 30% by weight, was mixed in the aqueous phase. After that, a mixture of oil-dispersion type cerium oxide (oil-dispersed cerium oxide) (Soulbrain) is added to emulsify, and other powders are mixed to prepare an oil-in-water cosmetic composition.

Example 3. Preparation of aqueous dispersion cosmetic composition containing water-oxidized cerium oxide

After mixing all the components of the aqueous phase, the aqueous dispersion type cerium oxide (Soulbrain), which is a dispersion in which cerium oxide is dispersed in the aqueous phase in an amount of about 30% by weight, was mixed in the aqueous phase. After that, other powders were mixed to prepare an aqueous dispersion cosmetic composition.

Example 4. Preparation of oil-dispersed cosmetic composition containing cerium oxide

After mixing all the oil phase components, the oil-dispersion type cerium oxide (Soulbrain), which is a dispersion in which the cerium oxide is dispersed in the oil phase at about 40% by weight, is mixed, and polyalcohol and alcohol, other additives, Other powders were mixed to prepare an oil-dispersed cosmetic composition.

Comparative Example 1. Preparation of water-in-oil cosmetic composition containing organic and inorganic sunscreens

In Comparative Example 1, a water-in-oil cosmetic composition was prepared by including organic and inorganic sunscreens instead of cerium oxide. Specifically, after mixing all the components of the aqueous phase, an inorganic sunscreen was mixed with the aqueous phase. Thereafter, oil was added to emulsify, and other powders and oily ingredients including an organic sunscreen were mixed to prepare a water-in-oil cosmetic composition.

Comparative Example 2. Water-oxidized and oil-dispersed cerium oxide-containing water-in-oil cosmetic composition preparation

In Comparative Example 2, a cosmetic composition was prepared by applying water-oxidized and oil-dispersed cerium oxide as a water-in-oil formulation instead of oil-in-water, water-dispersion, and oil-dispersion. Specifically, after mixing all the components of the aqueous phase, the aqueous dispersion type cerium oxide (Soulbrain), which is a dispersion in which cerium oxide is dispersed in the aqueous phase in an amount of about 30% by weight, was mixed in the aqueous phase. Thereafter, oil was added to emulsify, and other powder and oily components were mixed. A water-in-oil cosmetic composition was prepared by mixing an oil-dispersion type cerium oxide (Soulbrain), which is a dispersion in which cerium oxide is dispersed in an oil phase in an amount of about 40% by weight, in the mixture.

Comparative Example 3. Preparation of oil-in-water cosmetic composition containing organic and inorganic sunscreens

In Comparative Example 3, an oil-in-water cosmetic composition was prepared by including organic and inorganic sunscreens instead of cerium oxide. Specifically, after mixing all the components of the aqueous phase, an inorganic sunscreen was mixed with the aqueous phase. Thereafter, oil was added to emulsify, and an oil-in-water cosmetic composition was prepared by mixing other powders and oily ingredients including an organic sunscreen.

Comparative Example 4. Preparation of oil-in-water cosmetic composition containing organic sunscreen

In Comparative Example 4, an oil-in-water cosmetic composition was prepared by including an organic sunscreen instead of cerium oxide. Specifically, an oil-in-water cosmetic composition was prepared by mixing all of the aqueous phase components, emulsifying by adding oil, and mixing oily components including other powders and organic sunscreens.

Comparative Example 5. Preparation of oil-in-water cosmetic composition containing inorganic sunscreen

In Comparative Example 5, an oil-in-water cosmetic composition was prepared by including an inorganic sunscreen instead of cerium oxide. Specifically, after mixing all the components of the aqueous phase, an inorganic sunscreen was mixed with the aqueous phase. Thereafter, oil was added to emulsify, and other powder and oil components were mixed to prepare an oil-in-water cosmetic composition.

Comparative Example 6. Preparation of oil-in-water cosmetic composition containing cerium oxide powder

In Comparative Example 6, an oil-in-water cosmetic composition was prepared by including cerium oxide powder instead of dispersed cerium oxide. Specifically, after mixing all the components of the aqueous phase, cerium oxide powder was mixed with the aqueous phase. Thereafter, oil was added to emulsify, and other powder and oil components were mixed to prepare an oil-in-water cosmetic composition.

Comparative Example 7. Preparation of water-oxidized cerium oxide-containing oil-in-water cosmetic composition

In Comparative Example 7, a cosmetic composition was prepared by applying water-oxidized cerium oxide as an oil-in-water formulation instead of water dispersion. Specifically, after mixing all the components of the aqueous phase, the aqueous dispersion type cerium oxide (Soulbrain), which is a dispersion in which cerium oxide is dispersed in the aqueous phase in an amount of about 30% by weight, was mixed in the aqueous phase. Thereafter, oil was added to emulsify, and other powder and oil components were mixed to prepare an oil-in-water cosmetic composition.

Comparative Example 8. Preparation of oil-dispersed cerium oxide-containing oil-in-water cosmetic composition

In Comparative Example 8, a cosmetic composition was prepared by applying oil-dispersed cerium oxide as an oil-in-water formulation instead of oil dispersion. Specifically, after mixing all the aqueous phase components, oil was added to emulsify, and other powder and oil phase components were mixed. An oil-in-water cosmetic composition was prepared by mixing an oil-dispersion type cerium oxide (Soulbrain), which is a dispersion in which cerium oxide is dispersed in an oil phase in an amount of about 40% by weight in the mixture.

Experimental Example 1. Confirmation of light blocking effect

In order to confirm the light blocking effect of the cosmetic composition containing cerium oxide that has been water-oxidized or oil-dispersed through pretreatment, the UVB and UVA blocking effect and the near-infrared blocking effect of Examples 1 to 4 and Comparative Examples 1 to 8 were respectively in- Comparative measurements were made in vitro and in vivo. The near-infrared blocking effect was evaluated by measuring the spectral reflectance before and after application of the sample on the inner skin of a human arm with a spectrophotometer (NIR Spectrophotometer, ASD Inc., USA).

The following [Table 2] shows the results of comparative measurement of the light blocking effect of Examples 1 to 4 and Comparative Examples 1 to 8.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 UVB blocking 34 50+ 50+ 50+ 50+ 50+ 50+ 50+ 50+ 22 31 32 UVA blocking ++++ ++++ ++++ ++++ ++++ ++++ ++++ +++ +++ ++ ++ +++ Block infrared rays О О О О О О О X О О О О

As a result, as shown in Table 2, Examples 1 to 4 and Comparative Example 2 containing water-oxidized cerium oxide and/or oil-dispersed cerium oxide had a light blocking effect compared to Comparative Example 6 containing cerium oxide powder. was confirmed to be high.

In addition, Example 3 containing water-oxidized cerium oxide in the form of water dispersion showed a higher light blocking effect than Comparative Example 7 containing water-oxidized cerium oxide in the form of oil-in-water, and similarly oil-dispersed cerium oxide Example 4 containing oil-dispersed form showed a higher light blocking effect than Comparative Example 7 containing oil-dispersed cerium oxide in oil-in-water form, and also water-oxidized cerium oxide and oil-dispersed cerium oxide It was confirmed that Examples 1 or 2 contained in the form of heavy oil had a higher light blocking effect than Comparative Examples 7 or 8.

In addition, it was confirmed that Examples 1 to 4 had the same or higher light blocking effect compared to Comparative Examples 1 and 3 to 5 including the conventional organic/inorganic sunscreen.

The comparison result with Comparative Example 6 of Examples 1 to 4 and Comparative Example 2 shows that when applying the same amount of cerium oxide as a dispersion instead of directly applying the cerium oxide in a powder state, the cerium oxide is evenly distributed without clumping. This means that the light blocking effect can be increased.

In addition, the comparison result with Comparative Examples 7 or 8 of Examples 1 to 4 is such that in applying the same amount of the cerium oxide dispersion, the cerium oxide dispersion is evenly included in both phases instead of only one of the aqueous phase or the oil phase. When applied, it means that the light blocking effect can be increased. Specifically, when two phases exist (oil-in-water) as in Comparative Examples 7 or 8, if the cerium oxide is dispersed in only one of the aqueous phase or the oil phase, the cerium oxide cannot be evenly distributed in all phases, so the light blocking effect is lowered. , When only one phase exists (water dispersion or oil dispersion) as in Example 3 or 4, when cerium oxide is dispersed in the corresponding phase, the cerium oxide can be evenly distributed in the corresponding phase, and as in Examples 1 or 2, two When eggplant phases exist (oil-in-water), when cerium oxide is dispersed in both the aqueous phase and the oil phase, it can be seen that the cerium oxide can be evenly distributed in all phases, thereby enhancing the light-blocking effect.

In addition, from the comparative results of Examples 1 to 4 and Comparative Examples 1 and 3 to 5, it can be seen that when cerium oxide is applied as a dispersion, it has the same or superior light blocking effect than when the conventional organic/inorganic sunscreen is included. have.

Experimental Example 2. Confirmation of formulation stability

In order to confirm the stability of the cosmetic composition containing cerium oxide that has been water-oxidized or oil-dispersed through pretreatment, in Examples 1 to 4 and Comparative Examples 1 to 8, the sunscreen ingredients are oil-in-water, water-in-oil, water dispersion, and oil dispersion. It was visually compared and observed whether it was stably contained in each formulation without precipitation or agglomeration.

The following [Table 3] shows the results of comparative observation of the stability of Examples 1 to 4 and Comparative Examples 1 to 8.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 stability very good very good Great Great very good very good very good Great Great somewhat lacking Great somewhat lacking

As a result, as shown in Table 3, Examples 1 to 4 and Comparative Example 2 containing water-oxidized cerium oxide and/or oil-dispersed cerium oxide had formulation stability compared to Comparative Example 6 containing cerium oxide powder. It was confirmed that it appeared high.

In addition, Examples 1 and 2 containing water-oxidized cerium oxide and oil-dispersed cerium oxide as an oil-in-water formulation showed higher formulation stability than Comparative Example 8 containing oil-dispersed cerium oxide as an oil-in-water formulation. did.

In addition, it was confirmed that Examples 1 to 4 had formulation stability equal to or higher than Comparative Examples 1 and 3 to 5 containing the conventional organic/inorganic sunscreen.

The comparison result with Comparative Example 6 of Examples 1 to 4 and Comparative Example 2 shows that when applying the same amount of cerium oxide as a dispersion instead of directly applying it in a powder state, the cerium oxide is stable without clumping in the formulation. means that it can contain

In addition, the results of comparison with Comparative Example 8 of Examples 1 to 4 show that when a cerium oxide dispersion is applied to an oil-in-water formulation, including cerium oxide in both the oil phase and the aqueous phase is stable without precipitation or agglomeration of cerium oxide. It can be seen that there is a method that can contain it.

In addition, from the comparative results of Examples 1 to 4 and Comparative Examples 1 and 3 to 5, it can be seen that when cerium oxide is applied as a dispersion, it has the same or superior formulation stability than when the conventional organic/inorganic sunscreen is included. .

Experimental Example 3. Evaluation of usability

In order to check whether the light blocking composition containing cerium oxide has the effect of improving stickiness, dryness, and cloudiness compared to the light blocking composition containing organic/inorganic sunscreen or the water-in-oil type light blocking composition, 25 10 males and females between the ages of 36 and 10 were evaluated on a 5-point scale, and in order to confirm that there is no irritation, a patch test in which a certain amount of the compositions of Examples 1 to 4 and Comparative Examples 1 to 8 was applied to the arm was applied to the arm. carried out.

The following [Table 4] shows the results of comparative observation of the irritation properties of Examples 1 to 4 and Comparative Examples 1 to 8.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 skin irritation none none none none Slightly sensitive none Slightly sensitive there is a little Slightly sensitive none none none stickiness none none none none height slightly high height very high none none none none dryness none none none none has exist none has exist none very high has exist none none cloudiness lowness lowness lowness lowness has exist lowness has exist lowness very high none none none

As a result, as shown in Table 4, when the organic sunscreen agent is included as in Comparative Example 1, Comparative Example 3, and Comparative Example 4, there may be relatively slight irritation, the stickiness becomes severe, and Comparative Example 1 , Comparative Example 3, and Comparative Example 5, it was confirmed that when the inorganic sunscreen was included, the cloudiness and dryness worsened. However, as in Examples 1 to 4 and Comparative Examples 7 and 8, when cerium oxide was included as a UV blocking component, it was confirmed that irritation, stickiness, dryness, and cloudiness were improved.

In addition, as in Comparative Examples 1 and 2, in the case of the water-in-oil formulation, it was confirmed that the stickiness became more severe than in Examples 1 to 4.

In addition, as in Comparative Example 6, when cerium oxide was directly applied in a powder state, it was confirmed that it was relatively dry compared to Examples 1 to 4.

The comparison results of Examples 1 to 4 and Comparative Examples 7 and 8 with Comparative Examples 1 and 3 to 5 show that when cerium oxide is used as a sunscreen component, irritation and stickiness pointed out as disadvantages of organic sunscreens can be improved, It can improve the dryness or cloudiness pointed out as a disadvantage of the existing inorganic sunscreens such as titanium dioxide, which means that the feeling of use is superior to products composed of existing organic and inorganic sunscreens.

In addition, from the comparison results with Comparative Examples 1 and 2 of Examples 1 to 4, the heavy and stuffy feeling pointed out as a problem of applying the rare earth metal as a water-in-oil formulation is applied to oil-in-water, water-dispersion, and oil-dispersion formulations. If you do, you can see that improvement is possible.

In addition, from the comparison results with Comparative Example 6 of Examples 1 to 4, it can be seen that dryness is improved when cerium oxide is applied as a dispersion instead of directly applied in a powder state.

Claims (9)

cerium oxide water product surface-modified with a hydrophilic material; and at least one aqueous phase component selected from the group consisting of purified water, polyhydric alcohol, alcohol, aqueous phase thickener, emulsion stabilizer, and water-soluble emulsifier; And at least one oily component selected from the group consisting of surfactants, oil thickeners, and oils; a cosmetic composition for light blocking comprising an oil phase, or a combination thereof, wherein the composition is an oil-in-water, water-dispersion type, or oil component is mountain-shaped,
When the composition is an oil-in-water composition, the composition includes a cerium oxide aqueous dispersion surface-modified with a hydrophilic material and a cerium oxide oil dispersion surface-modified with a hydrophobic material.
The composition is a composition that does not contain titanium dioxide or zinc oxide. The composition of claim 1, wherein the hydrophobic material is at least one selected from the group consisting of stearic acid, aluminum stearate, alumina, polyhydroxystearic acid, triethoxycaprylylsilane, and lauroyllysine. . The composition of claim 1, wherein the hydrophilic material is at least one selected from the group consisting of polyacrylic acid, glutamic acid, and tromethamine. The composition of claim 1 , wherein the light comprises UVA, UVB, and near-infrared rays. The composition of claim 1, wherein the polyhydric alcohol is at least one selected from the group consisting of glycerin, mannitol, xylitol, sorbitol, butylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, and polyethylene glycol. The method according to claim 1, wherein the oil is trimethicone, dimethicone, phenyltrimethicone, cyclohexasiloxane, and at least one silicone-based oil selected from the group consisting of cyclopentasiloxane; at least one hydrocarbon-based oil selected from the group consisting of liquid paraffin, squalane, mineral oil, and triglycerin; at least one natural oil selected from the group consisting of olive oil, macadamia nut oil, and sunflower oil; Dipentaerythrityl hexaC5-9 acid ester, C12-15 alkyloctanoate, myristyl lactate, cetylethylhexanoate, neopentylglycol dicaprate, cetyloctanoate, isopropylmyristate, octyldodecyl Myristate, hexyllaurate, di(C12-C13)alkylmalate, myristyllactate, octyldodecylstearoylstearate, diisotearylmalate, pentaerythyltetraethylhexanoate, and diglyceryl At least one ester-based oil selected from the group consisting of triisotearate (diglyceryl triisostearate); Or a composition that is a combination thereof. The composition of claim 1, wherein the cerium oxide is included in an amount of 2 to 50% by weight based on the total weight of the composition. Mixing the aqueous cerium oxide water product surface-modified with a hydrophilic material with at least one aqueous component selected from the group consisting of purified water, polyhydric alcohol, alcohol, aqueous phase thickener, emulsion stabilizer, and water-soluble emulsifier; A method for preparing a composition, comprising:
The composition is an oil-in-water or water-dispersion type,
When the composition is oil-in-water, emulsifying by adding a mixture of a surfactant, an oil thickener, and a cerium oxide oil dispersion surface-modified with a hydrophobic material and at least one oily component selected from the group consisting of a surfactant; and ,
The composition is a method of manufacturing a cosmetic composition for light blocking that does not contain titanium dioxide or zinc oxide. A method for preparing a light-blocking cosmetic composition comprising: mixing a cerium oxide oil dispersion surface-modified with a hydrophobic material with at least one oily component selected from the group consisting of a surfactant, an oil thickener, and an oil,
The composition is an oil dispersion type,
The composition is a method of manufacturing a cosmetic composition for light blocking that does not contain titanium dioxide or zinc oxide.