KR20210049610A - Oil-in-water type cosmetic composition for UV protection with very water-resistance - Google Patents

Abstract

The present invention relates to an oil-in-water cosmetic composition for blocking UV having long-lasting water resistance, and the oil-in-water cosmetic composition for blocking UV according to an aspect, as an oil-in-water emulsion, does not contain alcohol to have improved water resistance, that is, continuous water resistance, is hypoallergenic, light, and hydrating, and provides a moist and soft feeling of use.

Description

Oil-in-water type cosmetic composition for UV protection with very water-resistance}

The present invention relates to an oil-in-water type sunscreen cosmetic composition having lasting water resistance.

In the case of sweating a lot in summer or playing in the water at the beach or swimming pool, there is a problem that the sunscreen is washed out in the water, so the demand for water-resistant sunscreen to prevent this is increasing. In particular, long-term outdoor activities or playing in the water use durable water-resistant products that have a longer water resistance than water-resistant products.

Conventional cosmetic compositions for UV protection that have water resistance and sustained water resistance are mostly in the form of water in oil emulsions where the external wound is oil.Because the external wound is oil, it adheres to the skin and is not washed well with water, so it has water resistance and lasting water resistance. easy. However, since water-in-oil emulsion is a formulation group mainly used for makeup products, it has a sense of adhesion, but it has a limitation in realizing a light and refreshing feeling because it has a heavy feeling of use and strong stickiness. In the current market situation, consumer demands for gel and lotion formulations that feel moisture among sunscreen cosmetics are increasing, and it is not easy to implement such formulations in water-in-oil type.

In contrast, the water-in-water type formulation has excellent feeling of use and easy cleansing, so that water-in-water type sunscreens have been developed, but it is common to include a film-forming agent for adhesion to the skin, and this film-forming agent makes it sticky. Appears. Thus, water-in-water type sunscreens have been developed that do not contain a film forming agent and have water resistance (Korean Patent Laid-Open Publication No. 10-2019-0059663), but they contain alcohol and have properties of sustained water resistance due to re-emulsification with water. Difficulty, there is a need for an oil-in-water type sunscreen that has lasting water resistance.

One aspect is 1 to 30% by weight of a sunscreen; And 0.5 to 5% by weight of a viscosity modifier, and to provide an oil-in-water type sunscreen cosmetic composition that does not contain alcohol.

One aspect is 1 to 30% by weight of a sunscreen; And 0.5 to 5% by weight of a viscosity modifier, and provides an oil-in-water type sunscreen cosmetic composition that does not contain alcohol.

As the cosmetic composition does not contain alcohol, it may exhibit lasting water resistance. Specifically, alcohol has a weak emulsifying power and causes re-emulsification when it comes into contact with water after being applied to the skin. Therefore, since it does not contain alcohol, re-emulsification is suppressed to show sustained water resistance. In addition, since the cosmetic composition does not contain alcohol, it may exhibit a moist feeling of use in which a feeling of moisture is felt when applied to the skin, and may exhibit hypoallergenicity. Therefore, the term "not including alcohol" indicates not only the case where alcohol is not included at all, but also indicates a moist feeling of use that maintains lasting water resistance and feels moisture when applied to the skin, and indicates the effect of a cosmetic composition according to one aspect of being hypoallergenic. It can be interpreted as including a case in which a small amount of alcohol is contained within a range that is not harmful.

The term "water-resistance" can mean the ability to withstand water, ie water resistance or waterproof function. Water resistance can be evaluated by the water resistance UV blocking index measured according to the water resistance test method. If the UV blocking index after immersion maintains 50% or more of the UV blocking index before immersion, "water resistance" or "sustainable water resistance" depending on the time of water resistance It is evaluated as ". Specifically, water resistance may be evaluated as having water resistance when it is immersed for 1 hour, and when the UV blocking index after immersion for 1 hour maintains 50% or more of the UV blocking index before immersion for 1 hour. In addition, sustained water resistance may be evaluated as having sustained water resistance when immersion for 2 hours, and when the UV blocking index after immersion for 2 hours maintains 50% or more of the UV blocking index before immersion for 2 hours. Therefore, the term "very water-resistance" refers to improved water resistance, and assuming that it is submerged for 2 hours after application, the UV protection index after submersion maintains 50% or more of the UV protection index before submersion. It can mean that.

In one embodiment, when the cosmetic composition is immersed for 2 hours after application, the UV blocking index after immersion may maintain 50% or more of the UV blocking index before immersion.

The "sunscreen agent" may include both an organic sunscreen agent and an inorganic sunscreen agent, for example, ethylhexylmethoxycinnamate, titanium dioxide, zinc oxide, butylmethoxydibenzoylmethane, isoamylp-methoxycinnamate , Ethylhexyl salicylate, octocrylene, homosalate, phenylbenzimidazole sulfonic acid, diethylaminohydroxybenzoylhexylbenzoate, and polysilicon-15. The sunscreen agent is 1 to 30% by weight based on the total weight of the cosmetic composition, for example, 1 to 25% by weight, 1 to 20% by weight, 1 to 15% by weight, 1 to 10% by weight, 1 to 5% by weight, 5 It may be included in to 30% by weight, 5 to 25% by weight, 5 to 20% by weight, 5 to 15% by weight, 5 to 10% by weight, 10 to 30% by weight, or 10 to 20% by weight. When the content of the sunscreen agent is more than 30% by weight, irritation may increase when applied to the skin and give a feeling of stuffiness, and when it is less than 1% by weight, the sunscreen ability may decrease.

The "viscosity modifier" may be used interchangeably with the term "thickener", and hydroxyethyl acrylate/sodium acryloyldimethyl taurate copolymer, sodium acrylate/sodium acryloyldimethyl taurate copolymer , Polyacrylate crosspolymer-6, polyacrylamide, and may be one or more selected from the group consisting of polyacrylate-13. The viscosity modifier is 0.5 to 5% by weight based on the total weight of the cosmetic composition, for example, 0.5 to 4% by weight, 0.5 to 3% by weight, 0.5 to 2% by weight, 0.5 to 1.5% by weight, 0.5 to 1% by weight, 1 It may be included in to 5% by weight, 1 to 4% by weight, 1 to 3% by weight, 1 to 2% by weight, or 1 to 1.5% by weight. When the content of the viscosity modifier is more than 5% by weight, it may give a heavy and thick feeling when applied to the skin, and when it is less than 0.5% by weight, the emulsified particles may not be formed well.

The cosmetic composition according to an aspect may include a viscosity modifier in an amount of 0.5 to 2% by weight based on the total weight of the cosmetic composition, and the feeling of use may be improved as the heavy and thick feeling inherent in the viscosity modifier decreases.

In one embodiment, the cosmetic composition may not include a film forming agent as an active ingredient. This should be interpreted as including not only that the film forming agent is not included at all, but also an effective amount that is generally acceptable in the art, that is, not included as an active ingredient. Specifically, when the cosmetic composition contains less than 1%, 0.5%, 0.1%, 0.05%, 0.01%, or 0.001% of the total weight of the film-forming agent, it may be regarded as not including the film-forming agent. .

In one embodiment, the cosmetic composition may not contain an emulsifier as an active ingredient. This should be interpreted as including not only that an emulsifier is not included at all, but also an effective amount that is generally acceptable in the art, that is, not included as an active ingredient. Specifically, when the cosmetic composition contains less than 1%, 0.5%, 0.1%, 0.05%, 0.01%, or 0.001% of the emulsifier based on the total weight of the composition, it may be regarded as not including the emulsifier.

The oil-in-water cosmetic composition according to an aspect may be one that forms emulsified particles using a viscosity modifier without adding a separate emulsifier. In one embodiment, the viscosity modifier may be dispersed in an aqueous phase in the form of a net, and the sunscreen agent may be present as large particles therein. Specifically, after dispersing the aqueous phase with a device such as a homomixer, when a viscosity modifier is added, it is dispersed in the aqueous phase in the form of a net, and oil-soluble components such as sunscreens can exist as large particles in the aqueous phase. It may be something that can be formed.

In one embodiment, the cosmetic composition may be emulsified at a temperature of 10 ℃ to 50 ℃. Specifically, it may be emulsified according to a low-temperature emulsification method emulsifying at room temperature.

The cosmetic composition is a lotion (skin lotion), skin softener, skin toner, astringent, lotion, milk lotion, moisture lotion, nutrition lotion, massage cream, nutrition cream, moisture cream, hand cream, foundation, essence, nutrition essence or aerosol composition It can be prepared in a formulation containing. Compositions of these formulations can be prepared according to methods conventional in the art.

The cosmetic composition is a preservative, stabilizer, surfactant, thickener, solubilizer, moisturizer, emollient, ultraviolet absorber, preservative, disinfectant, emulsifier, antioxidant, pH adjuster, organic and inorganic pigment, fragrance, coolant or limiting agent, etc. It may further include additives commonly used in the art. The blending amount of the additional ingredients such as the preservative can be easily selected by those skilled in the art within a range that does not impair the object and effect of the present invention, and the blending amount may be 0.001 to 40% by weight based on the total weight of the composition.

Another aspect is the step of stirring the aqueous phase; Adding a viscosity modifier to the aqueous phase and stirring to form a viscosity; And it provides a method for preparing a UV-blocking cosmetic composition of the water-in-water type comprising the step of emulsifying by adding and stirring the sunscreen to the aqueous phase. In the above method, the viscosity modifier, the sunscreen agent, and the cosmetic composition are as described above.

The cosmetic composition may be prepared by a low-temperature emulsification method, and the method may be performed at room temperature. For example, it can be carried out at a temperature of 10 ℃ to 50 ℃, 20 ℃ to 40 ℃, 25 ℃ to 35 ℃.

When prepared according to the above method, a film forming agent or an emulsifying agent may not be included as an active ingredient.

The formulation of the cosmetic composition prepared in this way is an oil-in-water emulsion, and when applied to the skin, a light and moisturizing feeling can be realized, and a thin oil film is formed on the skin while being absorbed, resulting in a form similar to a water-in-oil emulsion. Accordingly, the formed sunscreen oil film can have water resistance without a film forming agent, and in particular, it does not contain alcohol, so that it is hypoallergenic, yet provides a moist and soft feeling of use, and can have lasting water resistance. Specifically, since the alcohol component lowers the surface tension of the aqueous phase to facilitate emulsification without a surfactant, it can cause re-emulsification when it comes into contact with water. It can have water resistance.

The oil-in-water type sun-blocking cosmetic composition according to an aspect is an oil-in-water emulsion that does not contain alcohol, so it has improved water resistance, that is, lasting water resistance, and is mild, light and moisturized, and a moist and soft feeling of use can be realized.

1 is a photograph showing the result of evaluating washability of cosmetic compositions prepared in Example 1 (A) and Comparative Example 1 (B).

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.

Example 1. Preparation of an alcohol-free oil-in-water cosmetic composition using a low-temperature emulsification method

An oil-in-water emulsion containing no alcohol was prepared using a low energy emulsification method of emulsifying at room temperature according to the components and contents shown in Table 1 below.

Specifically, after dispersing the aqueous phase for 5 minutes at 5,000 rpm using a homomixer (HOMOGENIZING MIXER Model 2.5 PRIX, Japan), hydroxyethyl acrylate/sodium acryloyl dimethyl taurate copolymer as a thickener was added to 7,000 rpm. Mix uniformly for 5 minutes. After mixing to form a viscosity, an oily component composed of a sunscreen and a preservative were slowly added. At the same time as the addition, the mixture was uniformly mixed at 7,000 rpm for 5 minutes to finally obtain a yellow lotion-type composition.

Comparative Example 1. Preparation of an alcohol-containing oil-in-water cosmetic composition using a low-temperature emulsification method

An oil-in-water emulsion containing alcohol was prepared by using a low energy emulsification method of emulsifying at room temperature according to the components and contents shown in Table 1 below.

Purified water and ethanol were added to the beaker, weighed first, dispersed at 5,000 rpm for 5 minutes, and added a thickener. The thickener hydroxyethyl acrylate/sodium acryloyldimethyl taurate copolymer was added and uniformly mixed for 5 minutes at 7,000 rpm, and then an oily component composed of a sunscreen and a preservative were slowly added. At the same time as the addition, it was uniformly mixed and emulsified for 5 minutes at 7,000 rpm. As a result, a composition in the form of a yellow gel cream was finally obtained.

ingredient Content (% by weight) Example 1 Comparative Example 1 Purified water To 100 To 100 ethanol 0 15 Ethylhexylmethoxycinnamate 7.0 7.0 Homosalate 7.0 7.0 Diethylamino Hydroxybenzoyl Hexyl Benzoate 4.0 4.0 Zinc oxide 5.0 5.0 Hydroxyethyl acrylate/sodium acryloyl dimethyl taurate copolymer 1.0 2.0 antiseptic 0.5 0.5

Experimental Example 1. Evaluation of feeling of use

Sensory evaluation was performed to evaluate the feeling of use of the compositions prepared in Example 1 and Comparative Example 1.

Specifically, overall satisfaction with the compositions of Examples and Comparative Example 1 was evaluated for 20 men and women aged 25-35 years old, and the results are shown in Table 2 below. Among the evaluation criteria, the application property refers to the feeling that the composition is applied thinly rather than thickly on the skin surface when applied to the skin. Moisture refers to the feeling of maintaining moisture after being applied to the skin. Glossiness refers to the degree of oiliness and greasyness remaining on the skin after the composition is absorbed.

(Evaluation standard)

Very Bad: 1, Bad: 2, Moderate: 3, Good: 4, Very Good: 5

Example 1 Comparative Example 1 Spreadability 4.2 4.1 Moist 4.3 2.4 Greasy 3.7 3.5 Absorption rate 4.2 2.9 Residual feeling after absorption 3.9 3.0 satisfaction 4.1 3.3

As a result, as shown in Table 2, Example 1 containing no alcohol was found to be superior to Comparative Example 1 containing alcohol. In particular, the cosmetic composition of Example 1 was found to be superior to the cosmetic composition of Comparative Example 1 in terms of moisture. This means that in the case of the cosmetic composition of Comparative Example 1 containing ethanol, since ethanol is volatilized together with water, it causes dryness compared to the cosmetic composition of Example 1 that does not contain ethanol. In addition, it was found that the cosmetic composition of Example 1, in which the content of the viscosity modifier was reduced, had a faster absorption rate and less residual feeling after absorption than the cosmetic composition of Comparative Example 1. This means that as the content of the viscosity modifier is reduced, the heavy and thick feeling inherent in the viscosity modifier is reduced, and the feeling of use is improved.

Experimental Example 2. Skin irritation test

In order to evaluate the skin irritation properties of the compositions prepared in Example 1 and Comparative Example 1, a sensory skin patch test was performed.

Specifically, after performing a skin patch test on 20 people using the sunscreen cosmetic composition of Example 1 and Comparative Example 1, the extent of the appearance of the trouble was evaluated, and the results are shown in Table 3 below.

(Evaluation standard)

++: strong trouble, +: weak trouble, ±: normal, -: negative

Example 1 Comparative Example 1 ++ 2 + One 8 ± 5 9 - 14 One

As a result, as shown in Table 3, in the case of the composition of Example 1, troubles appeared in 5% or less of the test subjects, but in the case of the composition of Comparative Example 1, more than 50% of the troubles appeared and did not contain alcohol. It was confirmed that Example 1 had significantly lower irritation than Comparative Example 1 containing alcohol. This means that if the alcohol component is contained, skin irritation is increased.

Experimental Example 3. Evaluation of UV blocking performance

In order to evaluate the UV protection effect of the compositions prepared in Example 1 and Comparative Example 1, the UV protection index was measured.

Specifically, using Labsphere's UV Transmittance Analyzer UV-2000S machine, 2mg/cm ² was spread on the SPF measurement plate according to the method provided in the manual, and then the UV blocking index was measured, and the results are shown in Table 4 below.

Example 1 Comparative Example 1 SPF 72 69 PA ++++ ++++

As a result, as shown in Table 4, it was confirmed that the UV blocking effect of the composition of Example 1 and the composition of Comparative Example 1 was similar. This means that whether alcohol is contained or not does not affect UV protection performance.

Experimental Example 4. Continuous water resistance and water resistance efficacy evaluation

In order to evaluate the sustained water resistance and water resistance of the compositions prepared in Example 1 and Comparative Example 1, continuous water resistance and water resistance efficacy were evaluated in clinical institutions.

Specifically, the composition of Example 1 was evaluated for efficacy in sustained water resistance as follows. The evaluation of the sustained water resistance efficacy was performed according to the water resistance ultraviolet ray measurement method (Cosmetic Europe, 2005) and the standard operating instructions (SOP) of Dermapro Co., Ltd. After repeating the acquisition and drying four times, drying for 15 minutes, the water-resistant UV-blocking effect of the sample was evaluated by measuring and determining the minimum amount of erythema in the water-resistant non-applied area and the water-resistant sample application area, and data analysis.

In addition, the composition of Comparative Example 1 was evaluated for water resistance efficacy as follows. The water resistance evaluation was performed according to the methods suggested in Cosmetics Europe's SPF Test Method (ISO 24444) / Guidelines for Evaluating Sun Product Water Resistance (rev. 2005) and the Ellid Standard Operating Instructions (EL-P-7400). According to this method, when the water resistance ratio is 50% or more, it indicates that there is a water resistance effect. Minimum erythemal dose (MED) measurement and determination of the subject's non-applied area, measurement and determination of the minimum erythema amount of the sample application site, and repeated immersion and drying twice, and then minimal erythema on the water-resistant non-application area and the water-resistant sample application Through quantity measurement, determination, and data analysis, the water-resistant UV blocking effect of the sample was evaluated.

In addition, the composition of Comparative Example 1 was evaluated for efficacy in sustained water resistance as follows. The evaluation of the sustained water resistance efficacy was performed according to the water resistance ultraviolet ray measurement method (Cosmetic Europe, 2005) and the standard operating instructions (SOP) of Dermapro Co., Ltd. After repeating the acquisition and drying four times, drying for 15 minutes, the water-resistant UV-blocking effect of the sample was evaluated by measuring and determining the minimum amount of erythema in the water-resistant non-applied area and the water-resistant sample application area, and data analysis.

Table 5 below shows the results according to the evaluation method.

dSPF
(Dry SPF) wSPF
(Immersion SPF) % WRR
(Water resistance ratio) Example 1 (sustainable water resistance) 53.6 29.9 56.4 Comparative Example 1 (water resistance) 89.4 60.1 67.2 Comparative Example 1 (sustainable water resistance) 57.6 18.2 31.5

As a result, as shown in Table 5, it was confirmed that the composition prepared according to Example 1 had a sustained water resistance ratio of 50% or more, but in the case of Comparative Example 1, it was confirmed that the sustained water resistance ratio was less than 50%. . This means that the water resistance of Example 1 was improved compared to Comparative Example 1.

Experimental Example 5. Washability evaluation

In order to evaluate the washability of the composition prepared in Example 1, the area of application before and after washing was photographed and observed for comparison.

Specifically, the composition of Example 1 was applied on the skin in ^{an amount of 2 μL/cm 2} and absorbed, and then images were taken with VISIA CR-2.2 (Canfield Scientific, Inc., USA). The applied part was darkened by the sunscreen, and then the applied part was washed with lukewarm water at a temperature of about 40° C. for 30 seconds. After washing, the skin was dried, and the area applied with the same device was photographed again and compared with before washing. 1 is a photograph showing the result of evaluating washability of cosmetic compositions prepared in Example 1 (A) and Comparative Example 1 (B).

As a result, as shown in FIG. 1, in the case of the composition prepared according to Example 1, it was confirmed that the composition remained on the application site even after washing with lukewarm water, and it was confirmed that it has water resistance that is not well washed with water. However, it was confirmed that the composition prepared by Comparative Example 1 was washed out more than in Example 1. This means that the water resistance of Example 1 was improved compared to Comparative Example 1.

Claims (7)

1 to 30% by weight of sunscreen; And 0.5 to 5% by weight of a viscosity modifier, and an oil-in-water type sunscreen cosmetic composition that does not contain alcohol. The cosmetic composition according to claim 1, wherein the cosmetic composition does not contain a film forming agent or an emulsifier as an active ingredient. The cosmetic composition according to claim 1, wherein, when the cosmetic composition is immersed for 2 hours after application, the UV blocking index after immersion maintains 50% or more of the UV blocking index before immersion. The composition of claim 1, wherein the cosmetic composition is emulsified at a temperature of 10°C to 50°C, The cosmetic composition of claim 1, wherein the viscosity modifier is dispersed in an aqueous phase in a net-like form, and the sunscreen is present in large particles therein. The method according to claim 1, wherein the sunscreen is ethylhexylmethoxycinnamate, titanium dioxide, zinc oxide, butylmethoxydibenzoylmethane, isoamylp-methoxycinnamate, ethylhexyl salicylate, octocrylene, homosalate , Phenyl benzimidazole sulfonic acid, diethylaminohydroxybenzoylhexylbenzoate, and one or more cosmetic composition selected from the group consisting of polysilicon-15. The method according to claim 1, wherein the viscosity modifier is hydroxyethyl acrylate/sodium acryloyldimethyltaurate copolymer, sodium acrylate/sodiumacryloyldimethyltaurate copolymer, polyacrylate crosspolymer-6, polyacrylic A cosmetic composition that is at least one selected from the group consisting of amite, and polyacrylate-13.

Images