KR20200105337A - Light screening cosmetic composition comprising cerium oxide - Google Patents

Abstract

The present invention relates to a light-blocking cosmetic composition comprising cerium oxide. According to one aspect, the light-blocking cosmetic composition comprising cerium oxide is uniformly applied to each phase of an aqueous phase or an oil phase, and when the cosmetic composition is applied, the cerium oxide is uniformly present in any phase, and thus has a highly functional light-blocking effect compared with the content, without a separate existing organic-inorganic UV blocking component. In addition, the cosmetic composition is a formulation other than an existing water-in-oil formulation, has a light feeling of use without stickiness, and has an effect of ameliorating cloudiness, irritation and dryness.

Description

Light screening cosmetic composition comprising cerium oxide}

It relates to a cosmetic composition for light blocking containing 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 known, UV rays are divided into UVA and UVB, and there is a problem of promoting aging by penetrating into the skin. Near-infrared rays penetrate into the subcutaneous fat layer much deeper than UVA that reaches the deep dermis and cause collagen tissue destruction, active oxygen generation, as well as vasodilation, leading to fundamental skin aging such as loss of elasticity. In addition, blue light in the visible light region has higher penetration to the skin than ultraviolet rays and can be a direct cause of photoaging.

Existing organic sunscreens cause skin irritation when the content is high, 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 titanium dioxide has a problem that causes a cloudiness or has a high blueness and a stiff feeling of use, and zinc oxide is a heavy metal including nanoparticles. There is also an issue, so caution is always required.

Recently, in order to improve this problem, light blocking agents containing rare earth metal oxides such as cerium oxide have been developed (Korean Patent Registration No. 10-1861985), but since most are manufactured in water-in-oil formulations, there is a heavy and frustrating feeling, and cerium oxide is also 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 exhibits excellent light blocking effect compared to the same content even when applying cerium oxide in a formulation other than water-in-oil, but excluding separate organic/inorganic UV blocking components.

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

The other aspect is It is to provide a method for producing 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 is a light-blocking cosmetic composition comprising a cerium oxide dispersion, the composition provides an oil-in-water type, water dispersion type, or oil dispersion type composition.

The term “cerium oxide” is an inorganic powder, which means an oxide of cerium, which is 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 the cerium oxide according to an aspect is used as a light blocking component, problems such as dryness or cloudy sensation pointed out as a disadvantage of the conventional sunscreen using inorganic powders such as titanium dioxide and zinc oxide can be improved.

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

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

The “composition” may be any one of an water-in-water type, an aqueous 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-dispersible" refers to a form in which solid particles or powders are dispersed in a liquid aqueous phase. For example, cerium oxide powder may be dispersed in an aqueous phase. The term “oil-dispersible” refers to a form in which solid particles or powders are dispersed in a liquid oil phase. For example, cerium oxide powder may be dispersed in an oil phase.

In one embodiment, when the composition is an oil-in-water type, 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 at the same time in the aqueous phase and the 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. In the aqueous dispersion composition according to an aspect, when the cerium oxide is present in the aqueous phase, 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. In the oil-dispersible composition according to an aspect, when the cerium oxide is present in the oil phase, 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, a powder, or a combination thereof. The aqueous 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 degree of light blocking desired, and may be included in a small amount. However, if the cerium oxide dispersion is included alone as a light blocking component without a separate light blocking component, some degree of light blocking In order to give an effect, it may be generally 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, aqueous 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 hydroxy groups. The polyhydric alcohol includes those commonly used in the art, for example, the polyhydric alcohol is glycerin, mannitol, xylitol, sorbitol, glycols, such as butylene glycol, propylene glycol, diethylene glycol, It may be dipropylene glycol, polyethylene glycol, and the like. The "aqueous thickener" may be gellan gum, xanthan gum, cellulose gum, starch, montmorillonite, hectoria, bentonite, silicate, kaolin, zeolite, and the like. The "emulsification stabilizer" is a composite material containing a polymer such as (poly) acrylate, polyvinyl alcohol, polypropylene, etc., and may be used to aid in stabilization separately from a surfactant while having an increasing 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 “oil component” may include a surfactant, an organic sunscreen, an oil thickener, or an oil and other oil-soluble substances. The “surfactant” serves as an emulsifying auxiliary or dispersing role separate from the water-soluble emulsifier, and may be, for example, acids, sorbitans, and the like. The above "organic sunscreen" includes ethylhexylmethoxycinnamate, ethylhexylsalicylate, bis-ethylhexylhex, reagin, benzophenone, paraanimobenzoic acid, butylmethoxydibenzoyl Methane, octocrylene, 4-methylbenzylidene camphor, octylmethoxycinnamate, and the like may include those generally used as sunscreens in the art. The “oil thickener” is a wax, resin, or thickener, and may include 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, cray, and the like. The “oil and other oil-soluble substances” are not limited as long as they are used in cosmetic compositions to impart moisturizing power or fluidity, and for example, trimethicone, dimethicone, phenyltrimethicone, cyclohexasiloxane, cyclopentasiloxane Silicone oils such as; Hydrocarbon oils such as liquid paraffin, squalane, mineral oil, and triglycerin; Natural oils such as olive oil, macadamia nut oil, and sunflower oil; Dipentaerythritylhexa C5-9 acid ester, C12-15 alkyloctanoate, myristylactate, cetylethylhexanoate, neopentyl glycol dicaprate, cetyloctanoate, isopropylmyristate, octyldodecyl Myristate, hexyllaurate, di(C12-C13)alkylmaleate, myristylactate, octyldodecylstearoylstearate, diisotearylmaleate, pentaerythryltetraethylhexanoate, diglyceryl tri It may contain ester-based oils such as isotearate (diglyceryl triisostearate).

The “powder” may include other powder, inorganic sunscreen, hydrophobic surface-treated cerium oxide, or cerium oxide. The above “other powders” include talc, mica, synthetic mica, sericite, silica, silicone powder, boron powder, nylon powder, polymethacrylate powder, urethane powder, acrylate (co)polymer, polyethylene (co)polymer, organic type 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 to 40 wt%, 2 to 30 wt%, 2 to 20 wt%, 2 to 10 wt%, 5 to 50 wt%, 5 to 40 wt%, 5 to 30 wt%, 5 to 20 wt% %, 5 to 10% by weight, 10 to 50% by weight, 10 to 40% by weight, 10 to 30% by weight, 10 to 20% by weight, 20 to 50% by weight, 20 to 40% by weight, 20 to 30% by weight, It may be 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, the formulation stability is lowered.

The composition may further include one or more cosmetically acceptable carriers in addition to the above-described components. Specifically, fatty substances, organic solvents, solubilizers, thickeners, gelling agents, softening agents, antioxidants, suspending agents, stabilizers, blowing agents, fragrances, surfactants, water, ionic or nonionic emulsifiers, fillers, sequestering metal ions Agents and chelating agents, preservatives, vitamins, blockers, wetting agents, essential oils, dyes, pigments, hydrophilic or lipophilic actives, lipid vesicles or any other ingredients commonly used in cosmetics, and 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 object and effect of the present invention, and the blending amount is about 0.001 to about 30% by weight, specifically about 0.01 to May be 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, soft lotion, nutrition lotion, milk lotion, emulsion, serum, nourishing cream, moisturizing cream, massage cream, essence, eye cream, cleansing cream, cleansing foam, cleansing water , Pack, spray, powder, liquid foundation, or can be prepared in the form of a solid foundation. For example, it may be sun cream, sun stick, sun lotion, sun gel, sun powder, sun cushion, sun spray.

The other aspect is It provides a method for producing 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.

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

When the composition is an oil-in-water type, mixing the aqueous phase component; Adding water-oxidized cerium dioxide to the mixed aqueous phase component; And emulsifying by adding a mixture of an oily component and oil-dispersed cerium dioxide to the mixture.

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

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

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

The light-blocking cosmetic composition according to one aspect has cerium oxide uniformly applied to each phase of an aqueous phase or oil phase, so that cerium oxide is uniformly present in any phase when applied. It has a light blocking effect. In addition, as a formulation other than the existing water-in-oil formulation, it has a light feeling without stickiness, and has an effect of improving whiteness, 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 below, and the specific preparation 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 alcohol and alcohol 10.00 7.00 14.00 10.00 7.00 7.00 7.00 7.00 7.00 7.00 7.00 7.00 Award 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 powder 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 - - - - - - Oil 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 oil-in-water cosmetic composition containing water-oxidized and oil-dispersed cerium oxide

After mixing all the components of the aqueous phase, water-dispersion type cerium oxide (water-oxidized cerium oxide) (Soulbrain Corporation), which is a dispersion in which cerium oxide is dispersed in the aqueous phase in about 30% by weight, was mixed in the aqueous phase. After that, a mixture of oil-dispersed type cerium oxide (oil-dispersed cerium oxide) (Soulbrain Co., Ltd.), a dispersion in which the oil component and cerium oxide are dispersed in the oil phase, is added and emulsified, and other powders are mixed. Thus, an oil-in-water cosmetic composition was prepared.

Example 3. Preparation of a water-dispersible cosmetic composition containing water-oxidized cerium oxide

After mixing all the components of the aqueous phase, the aqueous dispersion type cerium oxide (Soul Brain Co., Ltd.), which is a dispersion in which about 30% by weight of cerium oxide is dispersed in the aqueous phase, was mixed in the aqueous phase. Then, other powders were mixed to prepare a water-dispersible cosmetic composition.

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

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

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

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

Comparative Example 2. Preparation of a water-in-oil cosmetic composition containing water-oxidized and oil-dispersed cerium oxide

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

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

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

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

Comparative Example 4 prepared an oil-in-water cosmetic composition by including an organic sunscreen instead of cerium oxide. Specifically, after mixing all of the aqueous phase components, oil was added to emulsify, and oil-in-water cosmetic compositions were prepared by mixing oily components including other powders and organic sunscreen.

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

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

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

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

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, water-dispersion type cerium oxide (Soulbrain), which is a dispersion in which about 30% by weight of cerium oxide is dispersed in the aqueous phase, was mixed in the aqueous phase. Then, oil was added to emulsify, and other powders and oily components were mixed to prepare an oil-in-water cosmetic composition.

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

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

Experimental Example 1. Light blocking effect confirmation

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 effects and the near-infrared blocking effects of Examples 1 to 4 and Comparative Examples 1 to 8 are respectively in- It was measured in vitro and in vivo. The near-infrared blocking effect was evaluated by measuring the spectral reflectance before and after application of the sample to the skin inside the human arm with a spectrophotometer (NIR Spectrophotometer, ASD Inc., USA).

The following [Table 2] is a result of comparing and measuring 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 ++++ ++++ ++++ ++++ ++++ ++++ ++++ +++ +++ ++ ++ +++ Blocking near 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 have a light blocking effect compared to Comparative Example 6 containing cerium oxide powder. It was confirmed that is high.

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

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

The comparison result of Examples 1 to 4 and Comparative Example 6 of Comparative Example 2 is that in applying the same amount of cerium oxide, if cerium oxide is applied as a dispersion instead of directly applying it in a powder state, cerium oxide is evenly distributed without agglomeration. It means that it can increase the light blocking effect.

In addition, the comparison result with Comparative Examples 7 or 8 of Examples 1 to 4 is that in applying the same amount of the cerium oxide dispersion, the cerium oxide dispersion is evenly included in the two phases instead of applying only one of the aqueous phase or oil phase. When applied, it means that the light blocking effect can be enhanced. Specifically, when there are two phases (oil-in-water) as in Comparative Examples 7 or 8, if cerium oxide is dispersed in only one of the aqueous phase or oil phase, the cerium oxide cannot be evenly distributed in all phases, resulting in poor light blocking effect. , When only one phase is present (water dispersion or oil dispersion) as in Example 3 or 4, when cerium oxide is dispersed in the phase, cerium oxide can be evenly distributed in the phase, and as in Examples 1 or 2, two When eggplant phases exist (oil-in-water), if 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 comparison 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. Formulation stability confirmation

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

[Table 3] is a result 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 insufficient Great Somewhat insufficient

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 have formulation stability compared to Comparative Example 6 containing cerium oxide powder. It was confirmed that it appeared high.

In addition, it was confirmed that Examples 1 and 2 containing water-oxidized cerium oxide and oil-dispersed cerium oxide in an oil-in-water formulation showed higher formulation stability compared to Comparative Example 8 containing oil-dispersed cerium oxide as an oil-in-water formulation. I did.

In addition, it was confirmed that Examples 1 to 4 have a formulation stability equal to or higher than that of Comparative Examples 1 and 3 to 5 including an organic/inorganic sunscreen.

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

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 stably contains cerium oxide without precipitation or aggregation. It can be seen that this is a method that can contain.

In addition, from the comparison 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 feeling of use

In order to confirm whether the light blocking composition containing cerium oxide has the effect of improving stickiness, dryness, and whiteness compared to the light blocking composition containing an organic/inorganic sunscreen or a light blocking composition of a water-in-oil formulation, 25 It was evaluated on a 5-point scale for 10 men and women between the ages of 36 and the age of 36, and in order to check whether there is no irritation, a patch test in which a patch to which a certain amount of the compositions of Examples 1 to 4 and Comparative Examples 1 to 8 was applied was applied to the arm was performed. Performed.

The following [Table 4] is a result of comparing and observing 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 Slight sensitivity none Slight sensitivity Some Slight sensitivity none none none Sticky 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 an organic sunscreen agent is included as in Comparative Example 1, Comparative Example 3, and Comparative Example 4, there may be relatively slight irritation, and the stickiness becomes severe, Comparative Example 1 , Comparative Example 3, and when the inorganic sunscreen agent was included as in Comparative Example 5, it was confirmed that the whiteness and dryness became severe. However, when cerium oxide was included as a UV-blocking component as in Examples 1 to 4 and Comparative Examples 7, 8, it was confirmed that there is an effect of improving irritation, stickiness, dryness, and whiteness.

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

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

The comparison results of Examples 1 to 4 and Comparative Examples 1 and 3 to 5 of Comparative Examples 7 and 8 show that when cerium oxide is used as a UV blocking component, irritation and stickiness pointed out as a disadvantage of organic UV blocking agents can be improved, It is possible to 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 the products composed of the existing organic-inorganic sunscreens.

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

In addition, from the comparison result 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)

A cosmetic composition for light blocking comprising a cerium oxide dispersion, wherein the composition is an oil-in-water type, water dispersion type, or oil dispersion type. The composition of claim 1, wherein the cerium oxide dispersion is a surface-modified cerium oxide dispersed in an aqueous or oil phase. The method of claim 2, wherein the cerium oxide is polyacrylic acid, glutamic acid, tromethamine, stearic acid, aluminum stearate, alumina, polyhydroxystearic acid, triethoxycaprylylsilane, and lauro A composition that is surface-modified with one or more selected from the group consisting of lysine. The composition of claim 1, wherein when the composition is an oil-in-water type, the cerium oxide is present in an aqueous phase and an oil phase. The composition of claim 1, wherein the composition further comprises an aqueous phase component, an oil phase component, powder, or a combination thereof. The composition of claim 1, wherein the cerium oxide is contained in an amount of 2 to 50% by weight based on the total weight of the composition. A method for producing 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. The method according to claim 7, wherein the cerium oxide dispersion is a method in which surface-modified cerium oxide is dispersed in an aqueous or oil phase. The method of claim 7, wherein the cerium oxide dispersion is obtained by dispersing a surface-modified cerium oxide in an aqueous or oil phase.