COSMETIC COMPOSITION CONTAINING ORGANIC-INORGANIC COMPOSITE PARTICLES FOR BLOCKING NEAR INFRARED RAYS

Abstract

Provided is a cosmetic composition including organic-inorganic composite particles for blocking near-infrared rays. When the cosmetic composition for blocking near-infrared rays according to the present disclosure is applied to skin, light in the near-infrared region may be significantly blocked. The cosmetic composition may be used as a multifunctional product in combination with a UV-blocking material to block a wide range of wavelengths adversely affecting the skin, thereby preventing skin aging.

Claims

1. A cosmetic composition for blocking near-infrared rays, the cosmetic composition comprising organic-inorganic composite particles for blocking near-infrared rays, wherein the organic-inorganic composite particles comprise a polymer matrix, and inorganic nanoparticles dispersed in the polymer matrix, and have a hollow spherical form having a predetermined thickness.

2. The cosmetic composition for blocking near-infrared rays of claim 1, wherein a ratio of a radius to the thickness of each of the organic-inorganic composite particles is 2:1 to 4:1, wherein the radius is measured from the center to the outermost point of each of the organic-inorganic composite particles.

3. The cosmetic composition for blocking near-infrared rays of claim 1, wherein a content of the inorganic nanoparticles is 1% by weight to 5% by weight, based on the total weight of the organic-inorganic composite particles.

4. The cosmetic composition for blocking near-infrared rays of claim 1, wherein a root mean square (RMS) surface roughness of an outer circumferential surface of each of the organic-inorganic composite particles is 10 nm to 50 nm.

5. The cosmetic composition for blocking near-infrared rays of claim 1, wherein a root mean square (RMS) surface roughness of an inner circumferential surface of each of the organic-inorganic composite particles is 5 nm to 30 nm.

6. The cosmetic composition for blocking near-infrared rays of claim 1, wherein the inorganic nanoparticles are selected from the group consisting of TiO.sub.2, ZnO, ZnO.sub.2, CuO, CuO.sub.2, Al.sub.2O.sub.3, Al(OH).sub.3, CeO.sub.2, Ce.sub.2O.sub.3, Fe.sub.2O.sub.3, ZrO.sub.2, and any mixture thereof.

7. The cosmetic composition for blocking near-infrared rays of claim 1, wherein the polymer matrix is selected from the group consisting of polystyrene, poly(methyl methacrylate), polymethylacrylate, polyethylacrylate, polypropylacrylate, polyisopropylacrylate, polyethylmethacrylate, polybutylacrylate, polybutylmethacrylate, polypentylacrylate, polypentylmethacrylate, polyglycidylmethacrylate, polycyclohexylacrylate, poly(2-ethylhexylacrylate), polyacrylic acid, polymethacrylic acid, and any mixture thereof.

8. The cosmetic composition for blocking near-infrared rays of claim 1, wherein plasmonic nanoparticles or a plasmonic nanofilm is attached to the surface of each of the inorganic nanoparticles.

9. The cosmetic composition for blocking near-infrared rays of claim 8, wherein the plasmonic nanoparticles and the plasmonic nanofilm are selected from gold, silver, platinum, palladium, copper, aluminum, and any mixture thereof.

10. The cosmetic composition for blocking near-infrared rays of claim 1, wherein the polymer matrix is poly(methyl methacrylate), and the inorganic nanoparticles are TiO.sub.2.

11. The cosmetic composition for blocking near-infrared rays of claim 1, wherein the cosmetic composition is a water-in-oil type cosmetic composition.

12. The cosmetic composition for blocking near-infrared rays of claim 1, wherein the cosmetic composition further comprises a cosmetic composition for blocking ultraviolet rays.

13. A method of preparing a cosmetic composition for blocking near-infrared rays, the method comprising: mixing an oil phase with organic-inorganic composite particles for blocking near-infrared rays, wherein the organic-inorganic composite particles for blocking near-infrared rays comprise a polymer matrix, and inorganic nanoparticles dispersed in the polymer matrix, and have a hollow spherical form having a predetermined thickness, dissolving a resulting product of the mixing by heating at 50 C. to 100 C. in a solution, and adding an aqueous phase to the solution dissolved by heating, followed by stirring.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0034] FIG. 1 is a graph showing spectral reflectance measurement of ultraviolet ray- and near-infrared ray-blocking inorganic particles; and

[0035] FIG. 2 is a graph showing a comparison, in terms of spectral reflectance in the near-infrared region, between a cosmetic composition including organic-inorganic composite particles for blocking near-infrared rays and a cosmetic composition not including the organic-inorganic composite particles for blocking near-infrared rays.

BEST MODE

EXAMPLE 1

Preparation of Cosmetic Composition for Blocking Near-Infrared Rays Including 2.5% by Weight of Organic-Inorganic Composite Particles for Blocking Near-Infrared Rays

[0036] A cosmetic composition of Example 1 was prepared as in a composition described in the following Table 1.

[0037] In detail, organic-inorganic composite particles having a hollow spherical form, in which titanium dioxide was dispersed in a polymer poly(methyl methacrylate) (PMMA), were first prepared as organic-inorganic composite particles for blocking near-infrared rays.

[0038] First, 0.60 g of methyl methacrylate (MMA) and 0.106 g of ethylene glycol dimethacrylate (EDGMA) were mixed, and then 0.015 g of 2 wt % CR-50 (manufactured by Ishihara Sangyo Kaisha) which is a commercial product of titanium dioxide nanoparticles was dispersed therein. Next, 0.15 g (20wt % with respect to MMA, MW: 120,000) of poly(methyl methacrylate) (PMMA) which is a linear polymer material was added thereto, followed by sonication for about 1 hour and 30 minutes. Thereafter, 0.011 g of AIBN was dispersed in 0.14 g of MMA, and the above sonicated solution was added thereto. Next, the AIBN-added solution was added to a PVA aqueous solution (15 g, 2 wt %) which had been heated in an oil bath at 80 C., followed by stirring. Homogenization was performed at 15000 rpm for 30 minutes, and a purification process of centrifugation (4000 rpm, 15 min) was repeated three times to obtain organic-inorganic composite particles for blocking near-infrared rays.

[0039] 2.5% by weight of the above organic-inorganic composite particles for blocking near-infrared rays including the inorganic material was mixed with and dispersed in oil phase described in Table 1, and dissolved by heating at 70 C. to 80 C. Thereafter, an aqueous phase was added thereto, followed by stirring.

TABLE-US-00001 TABLE 1 Content(wt %) Comparative Comparative Comparative Example Example Component Example 1 Example 2 Example 3 1 2 Oil Lauryl PEG-polydimethylsiloxyethyl 1.00 1.00 1.00 1.00 1.00 phase dimethicone PEG-10dimethicone 3.00 3.00 3.00 3.00 3.00 Ethylhexylmethoxycinnamate 5.00 5.00 5.00 5.00 5.00 (organic UV-filter) Butylene glycol 3.00 3.00 3.00 3.00 3.00 dicaprylate/dicaprate Diphenylsiloxy phenyl trimethicone 2.00 2.00 2.00 2.00 2.00 Cyclopentasiloxane 5.00 5.00 5.00 5.00 5.00 Cyclohexasiloxane 5.00 5.00 5.00 5.00 5.00 Dimethicone Disteardimonium hectorite 0.50 0.50 0.50 0.50 0.50 Inorganic Titanium dioxide (inorganic 5.00 material UV-filter) Zinc oxide (inorganic UV-filter) 5.00 Organic-inorganic composite 2.50 5.00 particles for blocking near-infrared rays Aqueous Purified water To 100 To 100 To 100 To 100 To 100 phase Disodium EDTA 0.02 0.02 0.02 0.02 0.02 Polyol 5.00 5.00 5.00 5.00 5.00 Preservative Proper Proper Proper Proper Proper amount amount amount amount amount Total 100 100 100 100 100

EXAMPLE 2

Preparation of Cosmetic Composition for Blocking Near-Infrared Rays Including 5.0% by Weight of Organic-Inorganic Composite Particles for Blocking Near-Infrared Rays

[0040] A cosmetic composition of Example 2 was prepared as in a composition described in the following Table 1. In detail, 5.0% by weight of the organic-inorganic composite particles for blocking near-infrared rays including the inorganic material which were prepared in the same manner as in Example 1 were mixed with and dispersed in oil phase, and dissolved by heating at 70 C. to 80 C. Thereafter, an aqueous phase was added thereto, followed by stirring.

Mode of Disclosure

[0041] Hereinafter, the present disclosure will be described in more detail with reference to Examples. However, these Examples are for illustrative purposes only, and the scope of the present disclosure is not intended to be limited by these Examples.

EXAMPLE 1

Preparation of Cosmetic Composition for Blocking Near-Infrared Rays Including 2.5% by Weight of Organic-Inorganic Composite Particles for Blocking Near-Infrared Rays

[0042] A cosmetic composition of Example 1 was prepared as in a composition described in Table 1.

[0043] In detail, organic-inorganic composite particles having a hollow spherical form, in which titanium dioxide was dispersed in a polymer poly(methyl methacrylate) (PMMA), were first prepared as organic-inorganic composite particles for blocking near-infrared rays.

[0044] First, 0.60 g of methyl methacrylate (MMA) and 0.106 g of ethylene glycol dimethacrylate (EDGMA) were mixed, and then 0.015 g of 2 wt % CR-50 (manufactured by Ishihara Sangyo Kaisha) which is a commercial product of titanium dioxide nanoparticles was dispersed therein. Next, 0.15 g (20wt % with respect to MMA, MW: 120,000) of poly(methyl methacrylate) (PMMA) which is a linear polymer material was added thereto, followed by sonication for about 1 hour and 30 minutes. Thereafter, 0.011 g of AIBN was dispersed in 0.14 g of MMA, and the above sonicated solution was added thereto. Next, the AIBN-added solution was added to a PVA aqueous solution (15 g, 2 wt %) which had been heated in an oil bath at 80 C., followed by stirring. Homogenization was performed at 15000 rpm for 30 minutes, and a purification process of centrifugation (4000 rpm, 15 min) was repeated three times to obtain organic-inorganic composite particles for blocking near-infrared rays.

[0045] 2.5% by weight of the above organic-inorganic composite particles for blocking near-infrared rays including the inorganic material was mixed with and dispersed in oil phase described in Table 1, and dissolved by heating at 70 C. to 80 C. Thereafter, an aqueous phase was added thereto, followed by stirring.

EXAMPLE 2

Preparation of Cosmetic Composition for Blocking Near-Infrared Rays Including 5.0% by Weight of Organic-Inorganic Composite Particles for Blocking Near-Infrared Rays

[0046] A cosmetic composition of Example 2 was prepared as in a composition described in the following Table 1. In detail, 5.0% by weight of the organic-inorganic composite particles for blocking near-infrared rays including the inorganic material which were prepared in the same manner as in Example 1 were mixed with and dispersed in oil phase, and dissolved by heating at 70 C. to 80 C. Thereafter, an aqueous phase was added thereto, followed by stirring.

[0047] Examples 1 and 2 were prepared in order to compare the near-infrared ray-blocking effects according to contents of the known UV-blocking inorganic material and the near-infrared ray-blocking organic-inorganic composite particles.

Comparative Example 1

Preparation of Comparative Cosmetic Composition Including No Inorganic Material

[0048] A cosmetic composition of Comparative Example 1 was prepared as in a composition described in Table 1. In detail, no materials were mixed with and dispersed in oil phase described in Table 1, and dissolved by heating at 70 C. to 80 C. Thereafter, an aqueous phase was added thereto, followed by stirring.

Comparative Example 2

Preparation of Comparative Cosmetic Composition Including Titanium Dioxide

[0049] A cosmetic composition of Comparative Example 2 was prepared as in a composition described in Table 1. In detail, 5.0% by weight of titanium dioxide which is an inorganic material was mixed with and dispersed in oil phase described in Table 1, and dissolved by heating at 70 C. to 80 C. Thereafter, an aqueous phase was added thereto, followed by stirring.

Comparative Example 3

Preparation of Comparative Cosmetic Composition Including Zinc Oxide

[0050] A cosmetic composition of Comparative Example 3 was prepared as in a composition described in Table 1. In detail, 5.0% by weight of zinc oxide which is an inorganic material was mixed with and dispersed in oil phase described in Table 1, and dissolved by heating at 70 C. to 80 C. Thereafter, an aqueous phase was added thereto, followed by stirring.

[0051] Comparative Example 1 was prepared in order to examine the near-infrared ray-blocking effect of the known UV-blocking organic material, and Comparative Examples 2 and 3 were prepared by using the known UV-blocking inorganic materials, titanium dioxide and zinc oxide, which may affect spectral reflectance in the near-infrared region, respectively. All of Comparative Examples and Examples were found to form opaque white emulsion-type compositions.

Experimental Example 1

Evaluation of Near-Infrared Ray-Blocking Ability Using Near-Infrared Spectrophotometer

[0052] In order to evaluate near-infrared ray-blocking ability of the organic-inorganic composite particles for blocking near-infrared rays prior to application of the particles to formulations, a near infrared spectrophotometer (NIR spectrophotometer, ASD Inc., USA) was used to measure spectral reflectance.

[0053] The wavelength region of near-infrared rays is 760 nm to 1400 nm, and in this region, higher spectral reflectance indicates higher near-infrared ray-blocking ability. Results of measuring spectral reflectance of the known UV-blocking inorganic particles and the near-infrared ray-blocking organic-inorganic composite particles are shown in FIG. 1.

[0054] Evaluation of the near-infrared ray-blocking ability is obtained by the reflectance measurement. Since organic materials generally absorb lights, the near-infrared ray-blocking ability was evaluated only for the UV-blocking inorganic particles and the near-infrared ray-blocking organic-inorganic composite particles.

[0055] Referring to FIG. 1, as titanium dioxide and zinc oxide which are used as the known UV-blocking inorganic materials were compared with each other, titanium dioxide was found to show higher spectral reflectance. However, as compared with the near-infrared ray-blocking organic-inorganic composite particles, spectral reflectance of the near-infrared ray-blocking organic-inorganic composite particles was found to be higher than those of the known UV-blocking inorganic particles.

Experimental Example 2

In-Vivo Evaluation of Near-Infrared Ray-Blocking Effect of Cosmetic Composition For Blocking Near-Infrared Rays

[0056] In order to evaluate near-infrared ray-blocking effects of the emulsions prepared in Comparative Examples and Examples, the following evaluation method developed by our company was employed. The near-infrared ray-blocking effects were evaluated by measuring spectral reflectance in the wavelength region of near-infrared rays, and an apparatus used for the measurement is the same as in Experimental Example 1.

[0057] [Method of evaluating near-infrared ray-blocking effect]

[0058] 1) Preparing the skin of the inner side of the human arm in a size of 3.5 cm4 cm

[0059] 2) Measuring spectral reflectance before sample application (control)

[0060] 3) Evenly applying 2 L/cm.sup.2 of the sample using fingers

[0061] 4) Leaving for 15 minutes

[0062] 5) Measuring spectral reflectance at the site to which the sample was applied (sample)

[0063] 6) Measuring infrared ray-blocking effects by putting the spectral reflectance before and after sample application into the following equation (IPF: Infrared Protection Factor)

[00001]$\begin{array}{cc}\mathrm{IPF}=\frac{\begin{array}{c}{}_{760.Math..Math.\mathrm{nm}}^{140.Math..Math.\mathrm{nm}}.Math.\mathrm{Reflectance}.Math.\left(\mathrm{sample}\right)-\\ {}_{760.Math..Math.\mathrm{nm}}^{1400.Math..Math.\mathrm{nm}}.Math.\mathrm{Reflectance}\left(\mathrm{control}\right)\end{array}}{{}_{760.Math..Math.\mathrm{nm}}^{1400.Math..Math.\mathrm{nm}}.Math.\mathrm{Reflectance}\left(\mathrm{control}\right)}& \left[\mathrm{Mathematical}.Math..Math.\mathrm{Equation}.Math..Math.1\right]\end{array}$

[0064] In order to examine the near-infrared ray-blocking effects, the near-infrared ray-blocking effects of Comparative Examples 1 to 3 and Examples 1 and 2 were compared with each other and the results are shown in FIG. 2. FIG. 2 is a graph showing measurement of the near-infrared ray-blocking effects by using the near-infrared spectrophotometer. Since higher reflectance in the near-infrared region indicates higher near-infrared ray-blocking effect, spectral reflectance after sample application was compared with spectral reflectance before sample application.

[0065] In FIG. 2, Control indicates the result of measuring spectral reflectance of the skin to which the sample was not applied, and others indicate the results of measuring spectral reflectance of the five cosmetic compositions prepared according to the compositions of Table 1. Since Comparative Example 1 included only the organic blocking agent as mentioned in Experimental Example 1, it absorbed infrared rays, and as a result, the spectral reflectance difference before and after application of the cosmetic composition was very small. Comparative Example 2 and Comparative Example 3 are cosmetic compositions including titanium dioxide and zinc oxide which are UV-blocking inorganic materials, respectively, and they showed high spectral reflectance, as compared with Comparative Example 1.

[0066] However, as shown in FIG. 2, when the compositions prepared by using the known UV-blocking inorganic materials (Comparative Example 2 and Comparative Example 3) were compared with the compositions prepared by using the near-infrared ray-blocking organic-inorganic composite particles (Example 1 and Example 2), the compositions prepared by using the near-infrared ray-blocking organic-inorganic composite particles showed much higher spectral reflectance in the near-infrared region than before application of the cosmetics, indicating that the near-infrared ray-blocking organic-inorganic composite particles reflect more near-infrared rays than the UV-blocking inorganic materials, and thus their effect of blocking near-infrared rays from the skin is high.

Experimental Example 3

Test of Sense of Use of Cosmetic Composition

[0067] Sense of use of the compositions prepared by Example 2 and Comparative Examples 2 and 3, each having the same content of the inorganic material, were evaluated for twenty adult men and women without skin diseases, as follows. Example 2 and Comparative Examples 2 and 3 were applied to their cheek, and sense of use, such as cloudiness, texture (smoothness), and overall satisfaction which may occur at the time of using inorganic materials, was evaluated and the results are shown in the following Table 2. If more than 15 persons satisfied, it was marked as .circle-solid.. If more than 10 persons satisfied, it was marked as . If more than 5 persons satisfied, it was marked as .

TABLE-US-00002 TABLE 2 Comparative Comparative Example Example 2 Example 3 1 Cloudiness .circle-solid. Texture .circle-solid. Overall satisfaction .circle-solid.

[0068] In general, inorganic material-containing compositions commonly show unsmooth texture or heavy cloudiness when applied to the skin, and therefore, they are required to be improved. As shown in Table 2, the cosmetic composition containing the near-infrared ray-blocking organic-inorganic composite particles according to the present disclosure showed improvement in cloudiness or rough texture, as compared with use of the known UV-blocking inorganic particles, and therefore, its overall satisfaction with sense of use was found to be excellent.