Cosmetic composition comprising inorganic particles for blocking blue light

Abstract

The present invention relates to a cosmetic composition comprising inorganic particles for blocking blue light, wherein the composition comprises inorganic particles having a blue light blocking effect as an active ingredient, thereby having the effect of significantly blocking light in the blue light region that is difficult to block in the prior art by reflecting and scattering light in the blue light wavelength range.

Description

Technical Field

[0001] The present invention relates to a cosmetic composition comprising inorganic particles for blocking blue light. Background Art

[0002] The light that people see in daily life is visible light, which is an electromagnetic wave with a wavelength roughly in the range of 380 to 800nm. Recently, research results have been published, and in this electromagnetic wave, "blue light" is blue light in the range of 380 to 500nm, which has an adverse effect on the skin. A paper published in 2012 (J.Invest.Dermatol., (2012) 132, 1901-1907) reported that, like ultraviolet rays, visible light containing blue light can also cause premature aging of the skin due to the generation of ROS and the expression of MMP-1, and a paper published in 2017 (FreeRadic.Biol.Med., (2017) 108, 300-310) also reported that blue light can also produce reactive oxygen in keratinocytes, such as superoxide (superclosedoxide), thereby causing skin aging phenomena similar to UVA. In addition, a 2010 paper (J. Invest. Dermatol., (2010) 130, 259-269) reported that long-term exposure to blue light can lead to reduced growth and differentiation of keratinocytes.

[0003] Blue light is light with higher energy after ultraviolet rays, so long-term exposure to blue light may cause considerable burden on the eyes or body. In particular, the main reason why blue light is considered to be a problem is that people use smart devices such as tablets and smartphones for a very long time in their lives, so the problem of the harmfulness of blue light is considered to be increasingly serious. In fact, many studies have been conducted on eye fatigue and dry eye syndrome caused by blue light, and various attempts have been made, such as producing a blue light blocking function for smartphones, as a countermeasure to these eye fatigue and dry eye syndrome. In addition, blue light weakens the secretion of melatonin, a sleep-inducing hormone, leading to sleep disorders, thereby disrupting the biological clock, causing the skin to become rough or dull.

[0004] Due to changes in daily living environments, smart devices such as smartphones, tablets or computer monitors have become necessities, and people are exposed to blue light sources for a long time. Therefore, it is necessary to develop cosmetics that can block blue light. Korean Patent Application Publication No. KR10-2017-0003391 discloses a cosmetic composition containing jade powder to block blue light, but the problem with jade powder is that it has a heavy feel when used as an inorganic powder and is difficult to use in sunscreen gel types, and because it blocks blue light by scattering and reflection and cannot evenly disperse blue light, it is difficult to evenly block short-wavelength blue light.

[0005] Thus, the present inventors discovered a material having a blue light blocking effect, developed a preparation containing the material, and confirmed that the preparation has a blue light blocking effect when applied to the skin, thereby completing the present invention. Summary of the invention

[0006] Problems to be solved by the invention

[0007] Due to changes in daily life environment, blue light belonging to the visible light region has become a new light source in recent years, and the skin needs to be protected from blue light, ultraviolet rays, and infrared rays. However, the existing inorganic powders used as ultraviolet and infrared blockers cannot effectively block blue light, so new blockers for blocking blue light from the skin and evaluation methods capable of evaluating them are also needed. Therefore, the object of the present invention is to find inorganic particles for blocking blue light that are formed into hollow spheres with a predetermined thickness, and to provide a cosmetic composition containing inorganic particles for blocking blue light. In addition, the object of the present invention is to measure the blue light blocking effect by actually applying the cosmetic composition to the skin.

[0008] Technical solutions to the problem

[0009] The present invention provides a cosmetic composition for blocking blue light, comprising hollow-structured inorganic particles as an active ingredient.

[0010] The present invention provides a cosmetic composition for blocking blue light, wherein the hollow-structured inorganic particles are silicon dioxide. Here, the particle size of the inorganic particles is 1 to 100 μm, preferably 1 to 20 μm. The present invention provides a cosmetic composition for blocking blue light, wherein the content of the inorganic particles is 0.001 to 20% by weight, preferably 0.01 to 10% by weight, based on the total weight of the composition.

[0011] In addition, the present invention provides a cosmetic composition for blocking blue light formulated in any one of a moisturizing gel, a moisturizing cream, an emulsion, an essence, a toner, a cream, a sunscreen, a sunscreen stick, a liquid foundation, and a solid foundation.

[0012] Meanwhile, the present invention provides a method for preparing a cosmetic composition for blocking blue light, the method comprising: a step of preparing a water phase; a step of preparing an oil phase containing inorganic particles for blocking blue light; and a step of mixing the oil phase with the water phase.

[0013] Effects of the Invention

[0014] The cosmetic composition for blocking blue light according to the present invention comprises inorganic particles with a blue light blocking effect as an active ingredient, which significantly blocks light in the blue light region that is difficult to block in the prior art by reflecting and scattering light in the blue light wavelength range, thereby having an effect of preventing photo aging. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A graph showing the measurement of spectral reflectance of inorganic particles used as ultraviolet material.

[0016] Figure 2 It shows a hollow type ( Figure 2 (a)) and closed type ( Figure 2 (b) Scanning electron microscope measurement of the structure of silicon dioxide.

[0017] Figure 3 A graph comparing spectral reflectances of a cosmetic composition including inorganic particles for blocking blue light and a cosmetic composition not including inorganic particles for blocking blue light in a blue light region is shown. DETAILED DESCRIPTION

[0018] Hereinafter, the present invention will be described in detail so that those skilled in the art can easily implement the present invention with reference to the attached technology. However, it will be apparent to those skilled in the art that the present invention can be implemented in various different forms and is not limited to the embodiments described herein.

[0019] The present invention is a cosmetic composition for the purpose of blocking blue light. The cosmetic composition for blocking blue light of the present invention blocks blue light from reaching the skin by reflecting and scattering light within the wavelength range of blue light.

[0020] Unlike ultraviolet rays, when blue light irradiates the skin, it does not cause visible skin changes such as erythema or darkening. Therefore, the existing ultraviolet blocking clinical evaluation method cannot be applied to the blue light blocking evaluation method. The light that enters the skin in a spectroscopic manner has three paths of reflection, absorption and transmission, among which the spectroscopic physical quantity of light that can actually be measured from the skin is the reflection amount. That is, this is because it is impossible to measure the degree of absorption or transmission of light when the cosmetic preparation is applied to human skin, but the reflectivity of the skin before and after application can be measured. Thus, the present invention has developed a clinical evaluation method that focuses on how much blue light is reflected by the skin in the blue light wavelength range. At the same time, although hollow spherical particles containing organic ultraviolet blockers have been disclosed in the prior art, the organic blockers have the property of absorbing light, and are therefore not suitable for objectively judging whether the organic blockers have a blue light blocking effect.

[0021] Before applying the blue light blocking inorganic particles to the composition, the spectral reflectance of titanium dioxide, zinc oxide and silicon dioxide itself in the blue light region in the inorganic materials used as active ingredients of ultraviolet blocking agents in the prior art was measured using a spectrophotometer (ASD, USA). Figure 1 The higher the spectral reflectance, the higher the blue light blocking ability.

[0022] As a result, it can be seen that silicon dioxide has the highest spectral reflectance compared to titanium dioxide or zinc oxide. Figure 1 , even under blue light, silica shows excellent reflectivity near the high energy region. Thus, the present inventors used silica materials as inorganic particles of the composition of the present invention.

[0023] The composition of the present invention contains silicon dioxide having a hollow structure as an active ingredient. When observed with a scanning electron microscope, it can be confirmed that the internal space of the spherical particles is hollow (refer to Figure 2 (a)). Figure 2 In the case of hollow silica, it can be confirmed that the size is 1 to 20 μm and the inside of the particle is empty ( Figure 2 (a)), in the case of closed silica, it can be confirmed that its size is 1 to 10 μm and the interior is filled ( Figure 2 (b)). Unlike the closed structure, the interior of the hollow structure particles is empty and thus more advantageous for blocking blue light because of the simultaneous occurrence of reflection from the outside of the particles and scattering from the inside.

[0024] The particle size of the hollow silica inorganic particles of the present invention is 1 to 100 μm, more preferably 1 to 20 μm, and is preferably not more than 100 μm in consideration of dispersibility, transparency, and feel during use.

[0025] In the present invention, those skilled in the art can easily determine the amount of hollow silica inorganic particles within the range that does not impair the purpose and effect of the present invention, but preferably contain about 0.001 to 20 weight %, more preferably about 0.01 to 10 weight %, based on the total weight of the composition of the present invention. When the amount exceeds 20 weight % based on the total weight of the composition, the feeling of use may be reduced.

[0026] The cosmetic composition for blocking blue light according to the present invention can be prepared into any preparation commonly prepared in this field. For example, the product form can be a moisturizing gel, moisturizing cream, emulsion, essence, toner, cream, sunscreen, sunscreen stick, liquid foundation or solid foundation preparation, etc.

[0027] In addition, the cosmetic composition for blocking blue light of the present invention may also be used together with a material that blocks ultraviolet rays and infrared rays, thereby being used as a product having a composite function.

[0028] Hereinafter, the present invention will be described in more detail by way of examples. However, these examples are only used to exemplify the present invention, and the scope of the present invention is not limited by these examples.

[0029] [Example]

[0030] 1. Preparation of cosmetic composition

[0031] Example 1. Preparation of a cosmetic for blocking blue light containing 2.5 wt % of inorganic particles for blocking blue light Composition

[0032] The cosmetic composition of Example 1 was prepared as shown in Table 1 below. 2.5 wt% of inorganic particles for blocking blue light were mixed and dispersed in the oil phase shown in Table 1, and then warmed and dissolved at 70 to 80° C. Thereafter, a cosmetic composition was prepared by adding an aqueous phase thereto and stirring the resulting mixture. The inorganic particles of Example 1 of the present invention are hollow spherical silica particles.

[0033] In order to verify the blue light blocking effect of the composition of Example 1, a spectrophotometer capable of measuring spectral reflectance at a wavelength of 350 to 2500 nm (ASD, USA) was used to measure the spectral reflectance spectrum in the region of 380 to 500 nm.

[0034] [Table 1]

[0035]

[0036]

[0037] Example 2. Preparation of a cosmetic for blocking blue light containing 5.0 wt % of inorganic particles for blocking blue light Composition

[0038] The cosmetic composition of Example 2 was prepared as shown in Table 1 above. Specifically, in the same manner as the method described in Example 1 above, 5.0% by weight of inorganic particles for blocking blue light were mixed and dispersed in the oil phase, and then warmed and dissolved at 70 to 80° C. Thereafter, the cosmetic composition was prepared by adding the aqueous phase thereto and stirring the resulting mixture. The inorganic particles of Example 2 of the present invention are hollow spherical silica particles, which differ from Example 1 in that 5.0% by weight of inorganic particles were mixed.

[0039] Examples 1 and 2 were prepared to compare the blue light blocking effect according to the existing ultraviolet blocking inorganic material and the content of inorganic particles for blocking blue light.

[0040] Comparative Example 1. Preparation of a cosmetic composition containing existing ultraviolet blocking inorganic particles

[0041] The cosmetic composition of Comparative Example 1 was prepared according to the composition shown in Table 1. Specifically, the inorganic material was mixed and dispersed in the oil phase, and the resulting dispersion was warmed to 70 to 80° C. Thereafter, the cosmetic composition was prepared by adding the water phase thereto and stirring the resulting mixture.

[0042] The blue light blocking effect was compared between the composition of the present invention including hollow silica and the closed silica as the inorganic particles of Comparative Example 1.

[0043] 2. Performance Testing

[0044] Experimental Example 1. Evaluation of the blue light blocking effect of the cosmetic composition for blocking blue light on the human body

[0045] In order to evaluate the blue light blocking effect of the emulsions prepared in the comparative examples and the examples, the following in-house developed evaluation method was used. The blue light blocking effect was evaluated by comparing the spectral reflectance before and after the emulsion was applied at a wavelength in the blue light region, and the equipment used for the measurement was the same as that used in Experimental Example 1.

[0046] [Blue light blocking effect evaluation method]

[0047] 1) Prepare a 3.5×4 cm skin patch on the endothelium of a human arm

[0048] 2) Measure the spectral reflectance before applying the sample (control)

[0049] 3) Apply 2 μL / cm evenly with your fingers 2 Samples

[0050] 4) Let the sample sit for 15 minutes

[0051] 5) Measure the spectral reflectance of the sample application location (sample)

[0052] 6) Substitute the spectral reflectance before and after application of the sample into the following formula 1 (BPF: blue light protection factor) to measure the blue light blocking effect

[0053] [Formula 1]

[0054]

[0055] The blue light blocking effects of Comparative Example 1 and Examples 1 and 2 are compared, and the results are shown in Figure 3 It can be determined that the more wavelengths are reflected in the blue light region, the more excellent the blue light blocking effect is, and thus, how much higher the spectral reflectance after applying the sample is than before applying the sample is compared.

[0056] exist Figure 3 Among them, "None" is the measurement result of the spectral reflectance of the skin without application of the product, and the rest are the measurement results of the three cosmetic compositions prepared according to the composition of Table 1. It can be seen that Comparative Example 1 is a closed silica blocking agent containing an existing material used as a UV blocking material, and the difference in spectral reflectance before and after the application of the cosmetics is small, so it cannot effectively block blue light.

[0057] It can be seen that the composition (Example 1, Example 2) prepared by applying the composition containing hollow silica as a blue light blocking inorganic material has a higher spectral reflectance than before applying the cosmetics and applying the composition containing closed silica in the blue light region. This indicates that the hollow silica reflects and scatters more blue light than the closed silica as an existing inorganic material for blocking ultraviolet rays, thereby more effectively blocking blue light from the skin.

[0058] Experimental Example 2. Evaluation test of the feeling of use of cosmetic composition

[0059] The compositions prepared by Example 1 and Comparative Example 1 above containing the same content (2.5% by weight) of inorganic materials were evaluated for the following feeling of use on 20 adult men and women without skin diseases. Example 1 and Comparative Example 1 were used on the cheeks to evaluate the possible white turbidity that may occur when using inorganic materials. Dry coating The results are shown in Table 2 below, including overall satisfaction and other usage feelings. When 15 or more people are satisfied, it is indicated as ◎, when 10 or more people are satisfied, it is indicated as ○, and when 5 or more people are satisfied, it is indicated as △.

[0060] [Table 2]

[0061] Comparative Example 1 Example 1 White turbidity ○ ◎ Coating properties ○ ◎ Overall satisfaction ○ ◎

[0062] Generally speaking, in the case of compositions containing inorganic materials, titanium dioxide or zinc oxide generally has a dry The use feeling of the hollow silica is poor, or the degree of white turbidity is serious when applied to the skin, so it is necessary to improve the dry use feeling and white turbidity. In the case of silicon dioxide, it has a lower white turbidity than titanium dioxide and zinc oxide, so it is easy to use, but as shown in Table 2 above, it can be seen that the cosmetic composition containing hollow silica according to the present invention shows excellent use feeling in terms of white turbidity or coating properties compared with the case of using existing closed silica. Therefore, it can be confirmed that the preparation containing hollow silica has excellent satisfaction in terms of overall use feeling.

Claims

1. A cosmetic composition for blocking blue light, wherein: The composition comprises hollow silicon dioxide as an active ingredient, wherein the silicon dioxide is dispersed in the oil phase and has a particle size of 1 to 100 μm, and the inside of the silicon dioxide particles is hollow, wherein the content of the silicon dioxide is 2.5 to 5.0 wt % based on the total weight of the composition.

2. The cosmetic composition for blocking blue light according to claim 1, wherein: The silicon dioxide has a particle size of 1 to 20 μm.

3. The cosmetic composition for blocking blue light according to claim 1, wherein: The cosmetic composition is formulated into any one of a moisturizing gel, an emulsion, an essence, a toner, a cream, a sunscreen stick, a liquid foundation and a solid foundation.

4. A method for preparing a cosmetic composition for blocking blue light, wherein: include: The step of preparing the aqueous phase; a step of preparing an oil phase portion containing dispersed silica for blocking blue light; as well as The step of mixing the oil phase with the water phase, the silicon dioxide has a hollow structure and a particle size of 1 to 100 μm, and the inside of the silicon dioxide particles is empty, wherein the content of the silicon dioxide is 2.5 to 5.0 wt % based on the total weight of the composition.

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