KR20220133816A - A composition comprising amphiphilic polymers - Google Patents

Abstract

The present invention provides a cosmetic composition containing an amphiphilic polyurethane-based polymer. The amphiphilic polyurethane-based polymer has a suitable affinity with both the skin and a makeup film, thereby increasing the affinity of makeup by reducing the surface energy gap between the skin and the makeup film, and playing a role in helping the makeup film to form better on the skin. Accordingly, it is possible to reduce the running, separation and clumping of makeup, and to form a thinner and more uniform makeup film by using the cosmetic composition. The effect results in improvement in the final skin texture, and there is an effect of great makeup application in which consumers can actually feel.

Description

Cosmetic composition comprising amphiphilic polymers {A composition comprising amphiphilic polymers}

The present invention relates to a cosmetic composition comprising an amphiphilic polymer.

Cosmetics are known to exhibit various skin improvement effects such as moisturizing, whitening, skin wrinkle or elasticity improvement, and the like. However, the most basic and important purpose of cosmetics is to make the appearance more beautiful. According to the results of various studies, it was found that make-up lump, makeup collapse, and makeup uplift had a large effect on how much makeup improves appearance. In the cosmetic field, in order to improve these points, technologies for improving skin texture and technologies for increasing adhesion between skin and makeup are continuously being developed.

The force that brings two objects into contact is called adhesion. To control this force, it is important to understand the intermolecular interactions. The more similar the surface energy of the two solid surfaces, the higher the affinity between the objects and the better the adhesion to each other. Van der Waals interactions affect the surface energy, but are less influential than covalent bonds or hydrogen bonds. Therefore, when there is a functional group capable of covalent bonding or hydrogen bonding, the effect on the surface energy increase is much greater than that of van der Waals. The surface energy of the skin is about 30-40 mJ/m ² , and in general, the surface energy of the foundation cosmetic film is greater than the surface energy of the skin by about 15 mJ/m ² or more. Therefore, by controlling the difference in surface energy between the skin and the cosmetic film, the affinity between the two can be controlled.

Methods such as spreadability analysis through dynamic friction coefficient analysis and Burial and durability analysis using artificial sebum are known as methods for analyzing the state of the cosmetic film. have. However, since most of the conventional analysis methods evaluate agglomeration, lifting, or collapse of makeup with the naked eye, there is a problem that the analysis of the makeup film is not objective or quantitative.

In the present invention, an amphiphilic substance capable of controlling the difference in surface energy between the skin and the cosmetic film at the interface between the skin and the cosmetic film is selected to improve affinity. An object of the present invention is to improve the affinity between the skin and the makeup film to solve the clumping, lifting, and crumbling of makeup, and to increase consumer satisfaction with makeup. We propose a novel cosmetic film analysis method using parameters related to three phenomena, which is more suitable than the conventional visual analysis method. First, the overall texture of the cosmetic film is analyzed through 3D non-contact atomic force microscope (AFM) analysis. The agglomeration phenomenon is confirmed through cross-sectional analysis of the cosmetic film. In addition, the collapse phenomenon is analyzed through a makeup film destruction experiment simulating muscle movement using a texture analyzer.

Through the three proposed methods, the cosmetic film can be objectively analyzed through physicochemical parameters related to actual phenomena. Therefore, it is expected to be helpful in objective research on consumers' cognitive efficacy and feeling of use.

Makeup clumping, lifting, and crumbling are three factors that determine how well a makeup is performed. An object of the present invention is to reduce the above three factors by improving the affinity between the skin and the cosmetic film by using an amphiphilic substance.

The present invention provides a cosmetic composition that increases the skin adhesion of a makeup cosmetic comprising an amphiphilic polyurethane polymer.

In addition, the present invention comprises the steps of applying to the skin a cosmetic composition that increases the skin adhesion of the above-mentioned makeup cosmetics; and

It provides a method of applying a cosmetic composition for increasing skin adhesion of a makeup cosmetic, comprising the step of forming a cosmetic film by applying the makeup cosmetic.

The present invention provides a cosmetic composition comprising an amphiphilic polyurethane-based polymer.

The amphiphilic polyurethane-based polymer has an appropriate affinity for both the skin and the cosmetic film, so it can reduce the surface energy gap between the skin and the cosmetic film to increase the affinity of the makeup, and to help the cosmetic film to be better formed on the skin do Through this, it is possible to improve the collapse, lift, and clumping of makeup, and to form a thinner and more uniform makeup film. Such an improvement effect can improve the final skin texture, and provide an effect that a makeup that consumers can feel is well received.

1 is a cross-sectional SEM image (a), C element EDS image (b), Ti element EDS image (c), and a cross-sectional SEM image (d), C element EDS image (e) of the technology applied essence of the essence without technology applied; Ti element EDS image (f) is shown.

The present invention relates to a cosmetic composition for increasing the skin adhesion of a makeup cosmetic comprising an amphiphilic polyurethane-based polymer.

Hereinafter, the configuration of the present invention will be described in detail.

When a part "includes" a certain component, it means that other components may be further included without excluding other components unless otherwise stated.

The cosmetic composition for increasing the skin adhesion of the makeup cosmetic of the present invention may include an amphiphilic polyurethane-based polymer.

In the O/W formulation, which is a basic product, a hydrophilic polymer is used as a thickener and/or film former, and in the W/S formulation, which is a color product, a silicone or acryl-based lipophilic polymer is used as a film former. In this case, it is advantageous in terms of formulation stability, adhesion to the skin, and affinity with the color formulation, but the hydrophilic polymer has a low affinity with the color makeup film, and the lipophilic polymer has a low affinity problem with the skin. Therefore, there is a risk that cosmetic lifting / collapsing / agglomeration phenomena occur.

In the present invention, the amphiphilic polyurethane-based polymer has a suitable affinity with both the skin and the cosmetic membrane. Thereby, it is possible to increase the affinity of the makeup cosmetic by reducing the surface energy gap between the skin and the cosmetic film, which can serve to reduce the aggregation of the makeup cosmetic to help the makeup film to be better formed on the skin. Therefore, by using an amphiphilic polyurethane-based polymer, it is possible to improve the cosmetic collapse, lifting, and agglomeration, and to form a thinner and more uniform cosmetic film. Such an improvement effect can improve the final skin texture, and provide an effect that a makeup that consumers can feel is well received.

In one embodiment, the amphiphilic polyurethane-based polymer is one of PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether and polyurethane-15. may be more than For example, a commercially available product containing the PEG-240/H diicopolymer bis-decyltetradeceth-20 ether and/or polyurethane-15 may be used.

In one embodiment, the content of the amphiphilic polyurethane-based polymer is not particularly limited, and may be used in an amount of 0.0001 to 5% by weight, 0.001 to 2% by weight, 0.01 to 1% by weight, or 0.05 to 0.5% by weight relative to the total composition.

In one embodiment, the cosmetic composition that increases the adhesion of the makeup cosmetic may be applied to the O/W formulation or the W/S formulation.

The cosmetic composition for increasing the skin adhesion of the makeup cosmetic according to the present invention may further include one or more active ingredients (active principle). The active ingredients include natural extracts, oils, moisturizers, whitening agents, wrinkle improvement agents, acne relievers, atopic emollients, sunscreens, hair restorers, vitamins and derivatives, amino acids or polypeptides, anti-inflammatory agents, female hormones, keratin exfoliating agents, bactericides, It may be one or more selected from the group consisting of placenta, allantoin, yeast extract, collagen, elastin, DHA, EPA, ceramide, fragrance, and mixtures thereof.

The cosmetic composition for increasing the skin adhesion of the makeup cosmetic of the present invention may be used before makeup. That is, the cosmetic composition for increasing the skin adhesion of the makeup cosmetic of the present invention may mean a cosmetic composition used in the pre-makeup stage.

The cosmetic composition according to the present invention can improve the adhesion of the makeup to improve the lifting of makeup, collapsing of makeup, or clumping of makeup.

The cosmetic composition of the present invention may be applied to at least one selected from the group consisting of basic cosmetics, sun products, and makeup base products.

In one embodiment, the cosmetic composition according to the present invention may be applied to a basic cosmetic, and then a makeup cosmetic may be applied after the basic cosmetic is applied to the skin. In this case, the basic cosmetics may be emulsions, essences and creams.

In one embodiment, the cosmetic composition according to the present invention may be applied to a sun product, and then a makeup cosmetic may be applied after the sun product is applied to the skin. In this case, the sun products may be sun cream, sun lotion, sun milk, sun stick, and the like.

In one embodiment, the cosmetic composition according to the present invention is applied to a makeup base product, so that the makeup base product can be applied to the skin and then the makeup cosmetics can be applied. In this case, the makeup base product may be a makeup base and a primer.

In the present invention, makeup cosmetics or color cosmetics can be broadly divided into base makeup cosmetics used for skin and point makeup cosmetics used for eyes, eyebrows, and lips. The base makeup cosmetics can decorate the entire face with a natural skin color with foundation, a touch of the cheek, etc. and produce a three-dimensional effect and transparency, and the point makeup cosmetics are eye shadow, mascara, artificial eyelashes, eyeliner, lipstick, etc. can do.

In addition, the present invention comprises the steps of applying to the skin a cosmetic composition that increases the skin adhesion of the above-mentioned makeup cosmetics; and

It relates to a method of applying a cosmetic composition for increasing skin adhesion of a makeup cosmetic, comprising the step of forming a cosmetic film by applying the makeup cosmetic.

In one embodiment, the cosmetic composition for increasing the skin adhesion of the makeup cosmetic includes an amphiphilic polyurethane-based polymer, and the type and content of the amphipathic polyurethane-based polymer are as described above.

In the present invention, the cosmetic composition that increases the skin adhesion of the makeup cosmetic is used before use of the makeup cosmetic to improve the adhesion of the makeup cosmetic, thereby improving the lifting of the makeup, the collapse of the makeup, or the clumping of the makeup.

In one embodiment, analysis of the cosmetic film may qualitatively determine whether or not the cosmetic film is formed by analyzing the surface, cross section, and fracture area of the cosmetic film.

First, the surface of the cosmetic film can be analyzed using an atomic force microscope (AFM, NX-10, Park system Co., Suwon, Korea) for three-dimensional (3D) surface analysis, and the average value of the peak among the roughness parameters It can be determined whether a thin and uniform cosmetic film is formed through the Spk value and the maximum thickness - Rpv value indicating the minimum thickness.

However, since the skin has curves, a single measurement of the roughness of the surface is not sufficient to determine that the cosmetic film is uniform. Therefore, in order to confirm the actual formation of the cosmetic film, an objective judgment can be made through cross-sectional analysis. Such cross-sectional analysis can be performed using a field emission scanning electron microscope (FE-SEM, JSM-7001F, JEOL, Tokyo, Japan) for 2D cross-sectional analysis.

The analysis of the surface and cross-section of the cosmetic film can determine the application characteristics of the makeup, but is not suitable for evaluating the collapse of the cosmetic film. The collapse of makeup is an important factor in an objective method of simulating muscle movement. In the present invention, a target motion simulation can be achieved by repeatedly folding and unfolding a sample having a cosmetic film on artificial skin at the same speed and distance using a texture analyzer (TA XT plus, Stable Micro Systems, Cardiff, UK), and a constant force to simulate muscle movement.

In one embodiment, when the cosmetic composition for increasing the skin adhesion of the makeup cosmetic according to the present invention is used compared to when the cosmetic composition is not used, the Rpv (Max - Min) value of the formed cosmetic film is 38% or more, 40 % or more, 45% or more, or 48% or more.

In one embodiment, when the cosmetic composition for increasing the skin adhesion of the makeup cosmetic according to the present invention is used compared to when the cosmetic composition is not used, the Spk value of the cosmetic film is 35% or more, 38% or more, 40% or more , or 43% or more.

In one embodiment, when the cosmetic composition for increasing the skin adhesion of the makeup cosmetic according to the present invention is used compared to when the cosmetic composition is not used, the thickness of the cross-section of the cosmetic film is 45% or more, 50% or more, 52% or more or more, or a decrease of 54% or more.

In the above, when the cosmetic composition with increased adhesion is not used, it means a case in which makeup cosmetics are applied to the skin without using the cosmetic composition according to the present invention (corresponding to "no application" in Experimental Example 1).

On the other hand, when using a cosmetic composition that increases the skin adhesion of a makeup cosmetic comprising an amphiphilic polyurethane-based polymer according to the present invention, the amphiphilic polyurethane-based polymer is not included (corresponds to “no polymer included” in Experimental Example 1) ) compared to 230% or more, 250% or more, 280% or more, or 300% or more Rpv value improvement effect, and also 180% or more, 200% or more, 210% or more, or 220% or more Spk value improvement effect can get

In the present invention, the amphiphilic polyurethane-based polymer increases the affinity between the skin and the cosmetic film, thereby affecting the actual formation of the cosmetic film.

This conclusion can be confirmed through the surface roughness, cross-sectional SEM image analysis, EDS elemental analysis, and fracture area analysis of Examples. The cosmetic film analysis method proposed in the present invention not only enables an objective quantitative analysis of the cosmetic film beyond the existing limitations, but also has a correlation with the efficacy perceived by consumers. Therefore, the present invention can be applied to the field of cosmetic membrane analysis in the future.

Hereinafter, the present invention will be described in detail through examples. The following examples only illustrate the present invention, but the scope of the present invention is not limited to the following examples. The present embodiments are provided so that the disclosure of the present invention is complete, and to completely inform those of ordinary skill in the art to which the present invention belongs, the scope of the invention, and the present invention will be defined by the scope of the claims. only

Example

Experimental Example 1. Evaluation of improvement in the texture of the cosmetic film

(1) Method

A sample of the O/W formulation was prepared with the composition (wt%) of Table 1 below.

control
sample Sample 1-1 Sample 1-2 Sample 1-3 Sample 1-4 Samples 1-5 PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether - 0.10 - 0.05 - - polyurethane-15 - - 0.1 0.05 - - Acrylates/C10-30 Alkyl Acrylate Crosspolymer - - - - 0.1 - Acrylate/Beheneth-25 Methacrylate Copolymer - - - - - 0.1 Trisodium EDIT 0.02 0.02 0.02 0.02 0.02 0.02 Alcohol 4.00 4.00 4.00 4.00 4.00 4.00 hexanediol 1.50 1.50 1.50 1.50 1.50 1.50 dipropylene glycol 4.00 4.00 4.00 4.00 4.00 4.00 glycerin 3.00 3.00 3.00 3.00 3.00 3.00 Pentaerythrityltetraethylhexanoate 3.00 3.00 3.00 3.00 3.00 3.00 Hydrogenated Polydecene 1.00 1.00 1.00 1.00 1.00 1.00 Methylglucose sesquistearate 0.30 0.30 0.30 0.30 0.30 0.30 Cyclopentasiloxane 5.00 5.00 5.00 5.00 5.00 5.00 corrector 0.22 0.22 0.22 0.22 0.22 0.22 Purified water up to 100 up to 100 up to 100 up to 100 up to 100 up to 100

After each sample was applied to the bio-skin, it was dried at room temperature for about 20-30 minutes. Then, liquid foundation (liquid FD) was applied using a puff the same number of times and with the same weight to form a cosmetic film.

Then, a three-dimensional surface analysis of the cosmetic film was performed using atomic force microscopy (AFM).

On the other hand, the case where the liquid foundation was applied without applying the sample to the bio-skin was set as “no application”, and the case where the liquid foundation was applied after applying the control sample to the bio-skin was set to “no polymer”. .

(2) Results

The results of analyzing the texture of the cosmetic film are shown in Table 2 below.

In Table 2, Spk is a reduced peak height index, which means the average roughness of the peak part that is higher than the average thickness. In addition, the Rpv value means the maximum thickness-minimum thickness of the cosmetic film. The smaller the Rpv value, the more uniform and thin the cosmetic film was, and the lower the Spk value, the more uniform and smooth the cosmetic film was finished. On the other hand, in Table 2, the improvement rate was calculated by the following formula.

<Equation 1>

Rpv improvement rate (%) = (Rpv value of sample - Rpv value of "no application") / (Rpv value of "no polymer" - Rpv value of "no application") X 100

<Equation 2>

Spk improvement rate (%) = (Spk value of sample - Spk value of "no application") / (Spk value of "no polymer" - Spk value of "no application") X 100

makeup film thickness makeup film smoothness Rpv Rpv
Improvement (%) Spk Spk
Improvement (%) no coating 9.044 - 2.206 - Polymer free 7.609 - 1.782 - Sample 1-1 PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether 4.382 324.9 0.935 299.8 Sample 1-2 Polyurethane-15 4.661 305.4 1.235 229.0 Sample 1-3 PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether + Polyurethane-15 3.775 367.2 0.820 326.9 Sample 1-4 Acrylates/C10-30 Alkyl Acrylate Crosspolymer 5.765 228.5 1.462 175.5 Samples 1-5 Acrylate/Beheneth-25 Methacrylate Copolymer 7.090 136.2 1.548 155.2

As shown in Table 2, the mixed sample of PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether, Polyurethane-15 and PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether and Polyurethane-15 was Rpv (Max-Min ), it can be seen that the value is small. Through this, it can be confirmed that the amphiphilic polyurethane-based polymer according to the present invention has an excellent effect of improving the texture of the cosmetic film.

In particular, the combination of PEG-240/HDI copolymer Bis-Decyltetradeceth-20 Ether and Polyurethane-15 may have a synergistic effect on texture improvement.

Experimental Example 2. Evaluation of the thickness of the cosmetic film section

(1) Method

Essence without technology and essence applied with technology were prepared with the composition (wt%) of Table 3 below.

Essence without technology Technology applied essence Carbomer 0.10 - PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether - 0.10 Trisodium EDIT 0.02 0.02 Alcohol 4.00 4.00 hexanediol 1.50 1.50 dipropylene glycol 4.00 4.00 glycerin 3.00 3.00 Pentaerythrityltetraethylhexanoate 3.00 3.00 Hydrogenated Polydecene 1.00 1.00 Methylglucose sesquistearate 0.30 0.30 Cyclopentasiloxane 5.00 5.00 corrector 0.22 0.22 Purified water up to 100 up to 100

After applying the essence without technology and essence with technology to the bio-skin, it was dried at room temperature for about 20-30 minutes. Then, the liquid foundation was applied the same number of times and with the same weight using a puff to form a cosmetic film, and a cosmetic film transfer material was applied. After drying the cosmetic film transfer material (epoxy resin), the cosmetic film was removed. A transfer material (epoxy resin) was additionally applied to the opposite side of the removed cosmetic film (the side that was in close contact with the bio-skin before removal). A sample in the form of a sandwich of transfer material/cosmetic film/transfer material was prepared by drying.

Then, the cross section was cut using a cross section polishing machine, and then analyzed by SEM analysis (FE-SEM, JSM-7001F, JEOL, Tokyo, Japan). In order to further confirm that the analyzed data is the actual composition layer, EDS elemental analysis was performed, and the titanium (Ti) element content of the TiO ₂ powder in the cosmetic film and the carbon (C) element content in the epoxy resin were measured and analyzed in more detail. did.

1 is a cross-sectional SEM image (a), C element EDS image (b), Ti element EDS image (c), and a cross-sectional SEM image (d), C element EDS image (e) of the technology applied essence of the essence without technology applied; Ti element EDS image (f) is shown.

As shown in FIG. 1 , it can be confirmed that the material above and below the cosmetic film is a polymer transfer material through the analysis of the carbon (C) element, and it can be confirmed that the cosmetic film is formed on the indicated portion through the titanium (Ti) analysis. In addition, the cosmetic clumping phenomenon can be confirmed in the essence without technology.

In the case of essence applied with technology, it can be visually confirmed that a thinner and more uniform cosmetic film is formed than that of essence without technology. When the cross-sectional thickness of each cosmetic film was measured, the essence without technology was 4.91 μm, and the essence applied with technology was 2.27 μm. Through this, it can be confirmed that the thickness when the technique of the present invention is applied is reduced by about 54%.

Experimental Example 3. Evaluation of cosmetic film according to polymer type_evaluation of makeup uniformity

(1) Method

In this experimental example, the polymer was not included in the formulation, but was dispersed in purified water (DI water) or D5 (silicone-based oil) at the same concentration, applied on artificial leather, and then foundation was applied to observe the formation state of the cosmetic film.

First, samples 3-1 to 3-6 containing the polymer shown in Table 4 were prepared.

Specifically, Polymers 1 to 3 used purified water as a solvent, and Polymers 4 to 6 used D5 as a solvent, and each 1 wt% of the polymer was dispersed in the solvent to prepare Samples 3-1 to 3-6.

polymer name polymer 1 PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether polymer 2 Acrylates/C10-30 Alkyl Acrylate Crosspolymer polymer 3 Carbomer Polymer 4 Trimethylsiloxysilicate resin polymer 5 Dimethicone Crosspolymer polymer 6 Acrylates/Dimethicone Copolymer

In order to simulate the formation of a cosmetic film (film) on the actual skin, artificial skin (artificial leather or bio-skin), which is often used for evaluation of color makeup conditions, was used. Polyurethane synthetic leather fabric plain is widely used for evaluations such as color-makeup applications. Bio-skin (Beaulax, Co. Ltd., Tokyo, surface free energy, γs = 31.5 mJ/m ² ) was chosen because the surface energy is within the surface energy range of human skin.

Cosmetic uniformity evaluation was performed as follows.

1) After washing the artificial leather surface with ethanol and drying it for about 20 minutes, 0.1 g of each sample was applied to the artificial leather.

2) After the artificial leather coated with the sample was sufficiently dried, the same amount of liquid foundation (liquid FD) as the sample was applied 10 times with the same weight using a puff.

3) After the artificial leather coated with liquid foundation was sufficiently dried, the primary data were obtained by measuring it at the same height, location, and lighting conditions in a temporary blackout before simulating the movement.

4) After photographing, the second data were obtained by repeating the above method after simulating the motion using a texture analysis device (TA XT plus, Stable Micro Systems, Cardiff, UK).

5) Using the Image Analysis Tool (Image Pro) program for the obtained image data, the same area was set to the same brightness or less, and then, less makeup/collapse of makeup was analyzed using the dark area ratio.

(2) Results

Table 5 below shows the evaluation results of cosmetic uniformity in artificial leather according to the type of polymer.

In this experimental example, in order to distinguish the dark area from the non-dark area, the brightness when the cosmetic film was physically peeled off using a knife was measured, and a case having a value lower than the brightness value was set as a "dark area" . Therefore, the larger the dark area, the less makeup is applied or the makeup is broken. At this time, the cosmetic improvement rate was calculated according to the following formula.

<Equation 3>

Make-up improvement rate (%): (% of dark area without application -% of dark area of sample) / % of dark area without application X 100

Apply makeup well (immediately after makeup film formation) Prevention of makeup collapse (after movement simulation) Dark Area (%) Makeup improvement rate (%) Dark Area (%) Makeup improvement rate (%) no coating 21.92 - 35 - Sample 3-1 4.55 79.24 17.82 49.09 Sample 3-2 16.15 26.32 28.48 18.63 Sample 3-3 19.36 11.68 23.78 32.06 Sample 3-4 13.72 37.41 31.28 10.63 Sample 3-5 11.12 49.27 29.47 15.80 Sample 3-6 18.67 14.83 36.71 -4.89

As shown in Table 5, silicone and dimethicone-based resins used in color tone, and Carbomer (surface energy: 50) and Acrylates/C10-30 Alkyl Acrylate Crosspolymer (surface energy: 33), it can be confirmed that PEG-240/HDI copolymer bis-Decyltetradeceth-20 Ether (Sample 3-1), which is an amphiphilic polyurethane-based polymer, is more advantageous in forming a cosmetic film.

In addition, it can be confirmed that the cosmetic film maintenance effect is excellent when PEG-240/HDI copolymer bis-Decyltetradeceth-20 Ether (Sample 3-1), which is an amphiphilic polyurethane-based polymer, is used after simulating the movement.

Experimental Example 4. Questionnaire survey

(1) Method

The survey was conducted on female volunteers aged 20-49 years (n = 33; proceeded with After the volunteers were randomly divided into two groups, the first group proceeded with 10 days of the essence applied with the technology of Experimental Example 2 for 10 days and the essence applied with the technology of Experimental Example 2 for 10 days, and the second group had 10 days of the essence applied with the technology of Experimental Example 2 , After 10 days of non-technical essence of Experimental Example 2, evaluation was conducted every 10 days. At this time, all evaluations were performed blindly. None of the volunteers had an allergic reaction to the test, such as redness or itching of the skin on their face.

(2) Results

In addition to objective and quantifiable assessments, the most important thing in the cosmetic field is the perceived efficacy of consumers. In fact, many studies have been conducted to link the tactile evaluation results and objective parameters.

In this experimental example, in order to confirm the correlation between the physical evaluation results of Experimental Examples 1 to 3 and the consumer's perceived efficacy evaluation, a consumer evaluation was performed.

The makeup-related phenomena were analyzed for 33 women in their 20s and 40s who wore makeup more than 5 days a week, and the results are shown in Table 6.

First, as a result of the makeup satisfaction evaluation, it can be seen that the satisfaction when using the essence applied with the technology of the present invention is 86%, and the satisfaction is improved by about 72% when compared with the essence without technology.

In addition, the makeup adhesion and skin texture related to the surface, cross-section, and fracture site analysis results of the existing cosmetic film were evaluated. In the case of adhesion, it can be seen that the satisfaction rate when using the essence applied with technology was 82.8%, which was increased by about 25.8% compared to the essence without technology. Similarly, when the skin becomes soft, it can be seen that the satisfaction rate when using the technology applied essence is 80%, which is 39.8% higher than that of the essence without technology.

Through these results, it can be confirmed that the method of increasing the affinity of the skin/cosmetic film is effective in improving the actual consumer experience. Therefore, a significant correlation can be confirmed by comparing the state analysis result of the cosmetic film and the feeling evaluation result.

Claims (8)

A cosmetic composition comprising an amphiphilic polyurethane-based polymer to increase the skin adhesion of a makeup cosmetic.
The method of claim 1,
The amphiphilic polyurethane-based polymer is one or more of PEG-240/HDI Copolymer Bis-Decyltetradeceth-20 Ether and polyurethane-15, A cosmetic composition that increases skin adhesion.
The method of claim 1,
The content of the amphiphilic polyurethane-based polymer is 0.0001 to 5% by weight relative to the total weight of the composition, a cosmetic composition for increasing the skin adhesion of a makeup cosmetic.
The method of claim 1,
A cosmetic composition for increasing the skin adhesion of a makeup cosmetic is used before makeup to improve the adhesion of the makeup cosmetic to improve the lifting of the makeup, the collapse of the makeup, or the clumping of the makeup. A cosmetic composition for increasing the skin adhesion of the makeup cosmetic .
The method of claim 1,
The formulation is at least one selected from basic cosmetics, sun products, and makeup base products, a cosmetic composition that increases the skin adhesion of a makeup cosmetic.
Applying to the skin a cosmetic composition that increases the skin adhesion of a makeup cosmetic comprising an amphiphilic polyurethane-based polymer; and
A method of applying a cosmetic composition for increasing skin adhesion of a makeup cosmetic, comprising the step of applying a makeup cosmetic to form a cosmetic film.
7. The method of claim 6,
When using a cosmetic composition that increases the skin adhesion of makeup cosmetics compared to when the cosmetic composition is not used,
The Rpv (Max - Min) value of the formed cosmetic film decreases by 38% or more,
A method of applying a cosmetic composition to increase the skin adhesion of a makeup cosmetic, wherein the Spk value of the cosmetic film is reduced by 35% or more.
7. The method of claim 6,
When using a cosmetic composition that increases the skin adhesion of makeup cosmetics compared to when the cosmetic composition is not used,
A method of applying a cosmetic composition to increase the skin adhesion of a makeup cosmetic, wherein the thickness of the cross-section of the cosmetic film is reduced by 50% or more.

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