KR102156750B1 - Cosmetic composition comprising wood flour for scattering or reflecting ultraviolet radiation - Google Patents

Abstract

The present invention relates to a cosmetic composition for scattering or reflecting ultraviolet rays using wood powder (wood powder) obtained by pulverizing wood-based biomass. Unlike organic sunscreens, the composition of the present invention can block both UVA and UVB, and unlike inorganic sunscreens, it does not have photocatalytic activity, so it is a composition that can overcome each of the shortcomings, and has a bright color, so it is also an aesthetic part as a cosmetic material. There is an advantage not to miss. In addition, it is easy to mix and disperse with the existing sunscreen, and when mixed in this way, it can be used as an economical natural additive because it contributes to the photostability of the existing sunscreen.

Description

A cosmetic composition for scattering or reflecting ultraviolet rays containing wood powder {COSMETIC COMPOSITION COMPRISING WOOD FLOUR FOR SCATTERING OR REFLECTING ULTRAVIOLET RADIATION}

The present invention relates to a cosmetic composition for scattering or reflecting ultraviolet rays.

In the past, cosmetics have been recognized as a simple beauty care use, but in recent years, more attention has been paid to ingredients that show actual efficacy in addition to the function of beauty. Functional cosmetic material technology has many fields such as anti-oxidation, anti-aging, and UV protection, and the present invention pays attention to UV protection materials. As the dangers of UV rays from the sun are becoming known, interest in UV blocking materials is expanding not only to consumers but also to research and industry. Existing sunscreen materials are divided into inorganic and organic sunscreens based on synthetic compounds. Ingredients based on inorganic substances physically scatter and reflect ultraviolet rays to block, and representatively, there are titanium dioxide and zinc oxide. In contrast, organic-based ingredients absorb UV rays and prevent them from penetrating the skin. Representative ingredients include avobenzone, oxybenzone, and methoxycinnamate derivatives. The demand for environmentally friendly natural materials has been increased as reports that conventional synthetic compound UV-blocking materials have an adverse effect on the environment at a distance to humans have been continuously published.

Wood flour, a sustainable natural material made from pulverized wood and into fine particles, is widely used in industrial materials such as synthetic wood, paints, leather products, chassis and construction materials, and automobile interior materials. Lignin, one of the major constituents of wood, is a natural polymer. P- coumaryl alcohol, coniferyl alcohol, and sinapyl alcohol, which are phenylpropanoid-based monomers, form a complex three-dimensional structure formed by β-O-4 and carbon-carbon bonds. Is being achieved. Like existing organic sunscreens, it has the ability to absorb ultraviolet rays because it contains a number of functional groups including a benzene group. However, during the process of heating and acid/base treatment of wood to extract lignin, its color changes to dark brown, so there is a limitation in applying it to cosmetics.

Korean Patent Publication No. 2018-0054630

An object of the present invention is to provide a cosmetic composition for scattering or reflecting ultraviolet rays including wood powder.

1. A cosmetic composition for scattering or reflecting ultraviolet rays containing wood powder.

2. In the above 1, wherein the wood powder is a coniferous wood powder, ultraviolet scattering or reflection cosmetic composition.

3. In the above 1, wherein the wood powder has a particle diameter of 200㎛ or less, UV scattering or reflection cosmetic composition.

4. In the above 1, wherein the wood powder is containing 0.5 to 10% of the total weight of the composition, UV scattering or reflection cosmetic composition.

5. In the above 1, wherein the ultraviolet rays contain UVA, ultraviolet scattering or reflection cosmetic composition.

6. The cosmetic composition for ultraviolet scattering or reflection according to the above 1, further comprising an ultraviolet absorber.

7. In the above 6, the ultraviolet absorber is t-butylmethoxy dibenzoyl methane (t-butylmethoxy dibenzoyl methane), diethylamino hydroxybenzoyl hexyl benzoate (diethylamino hydroxybenzoyl hexyl benzoate), ethylhexyl trizone (ethylhexyl triazone) , loam butylene dimethacrylate (octocrylene), octyl methoxycinnamate (octyl methoxycinnamate), isoamyl - p - methoxycinnamate (isoamyl- p -methoxycinnamate), bis-ethylhexyl phenol oxyl-methoxyphenyl-triazine (bis-ethylhexyloxyl phenolmethoxy phenyl triazine), octyl salicylate (octyl salicylate), p -aminobenzoic acid ( p -aminobenzoic acid), benzophenones (benzophenones) and anthranilate (anthranilates) to contain at least one selected from the group consisting of, Cosmetic composition for scattering or reflecting ultraviolet rays.

8. In the above 7, wherein the ultraviolet absorber is t-butylmethoxy dibenzoyl methane (t-butylmethoxy dibenzoyl methane), a cosmetic composition for ultraviolet scattering or reflection.

Wood flour is a natural material unlike existing synthetic sunscreen materials, and is expected to overcome the disadvantages of existing sunscreens. Unlike organic sunscreens, wood powder blocks both UVA and UVB and is not absorbed into the skin, so it has less irritation. Unlike inorganic sunscreens, wood powder does not have photocatalytic activity, so it does not generate active oxygen when exposed to sunlight. In addition, unlike conventional lignin, wood powder has a bright color, which is a great advantage in cosmetics that have a large aesthetic effect.

Wood powder, first introduced as a UV blocking material (absorbing, scattering or reflecting material) in the present invention, is well mixed and dispersed with sunscreen, and can be used as an economical natural additive that improves the light stability of existing sunscreens.

1 is a photograph comparing the colors of wood powder used in the present invention, showing the colors of (a) coniferous wood powder, (b) hardwood wood powder, (c) waste wood powder, and (d) kraft lignin.
2 is a diagram showing an ultraviolet transmittance spectrum of a moisturizing cream mixed with coniferous wood powder, and a diagram illustrating the ultraviolet transmittance of each wavelength according to the weight.
3 is a diagram showing an ultraviolet transmittance spectrum of a moisturizing cream mixed with hardwood wood powder, and a diagram illustrating the ultraviolet transmittance of each wavelength according to the weight.
4 is a view showing the ultraviolet transmittance spectrum of the moisturizing cream mixed with waste wood powder, and is a diagram illustrating the ultraviolet transmittance of each wavelength according to the weight.
5 is a photograph comparing the colors of a moisturizing cream in which wood powder (1%) is mixed, (a) a moisturizing cream, (b) a moisturizing cream in which coniferous wood powder is mixed, (c) a moisturizing cream in which hardwood wood powder is mixed, ( d) A diagram showing the color of the moisturizing cream mixed with waste wood powder.
6 shows the stability of a moisturizing cream in which avobenzone (3%) and wood flour (1%) are mixed with respect to ultraviolet irradiation, and is a diagram showing the change in ultraviolet transmittance at a wavelength of 300 nm according to ultraviolet irradiation time.
7 is a diagram showing the stability of a moisturizing cream in which avobenzone (3%) and wood flour (1%) are mixed with respect to ultraviolet irradiation, and is a diagram showing a change in ultraviolet transmittance at a wavelength of 360 nm according to ultraviolet irradiation time.
Figure 8 is a picture comparing the colors of the sunscreen (BIOTHERM) mixed with wood flour (1%), (a) sunscreen, (b) sunscreen mixed with coniferous wood powder, (c) sunscreen mixed with hardwood wood powder, (d ) It is a diagram showing the color of the sunscreen mixed with waste wood powder.

Hereinafter, the present invention will be described in detail.

The present invention relates to a cosmetic composition for scattering or reflecting ultraviolet rays comprising wood powder.

The wood flour can be used without limitation as long as it is finely ground wood-based biomass. The type of wood may be, for example, coniferous wood powder, hardwood wood powder, or a mixed wood powder of coniferous and hardwood obtained by pulverizing waste wood, and preferably, coniferous wood powder, but is not limited thereto.

In the case of the coniferous wood powder, it is easy to use in cosmetics because it has a lighter color than the hardwood wood powder or waste wood powder, and the demand of consumers is also high, which is preferable for application in the cosmetic field.

For example, wood flour may have a color difference (ΔE) of about 30 to 40, but is not limited thereto. In addition, as a specific example, when 0.5 to 7% of the total weight of the cosmetics is mixed with cosmetics such as moisturizing cream and sunscreen, the color difference (ΔE) compared to the cosmetics before mixing may be about 3 to 15, but is not limited thereto. .

Specifically, when the cosmetic is a moisturizing cream and 0.5 to 7% of the total weight of wood powder is mixed, the color difference (ΔE) compared to the moisturizing cream before mixing may increase by about 3 to 10,

When the cosmetic is a sunscreen agent and 0.5 to 7% of the total weight of wood powder is mixed, the color difference (ΔE) compared to the sunscreen agent before mixing may increase by about 5 to 15, but is not limited thereto.

In addition, in the case of the coniferous wood powder, the range of UV wavelengths that can be blocked is wider than that of the hardwood wood powder or waste wood powder, so that the ultraviolet ray blocking ability is good.

The particle diameter of the wood flour may be 200 μm or less, preferably 100 μm or less, and more preferably 30 μm to 100 μm, but is not limited thereto. If the particle diameter of the wood powder exceeds 200 μm, it becomes difficult to disperse into the cosmetic composition, and skin spreadability may decrease. The smaller the particle diameter of the wood powder, the better the dispersion, the better the skin spreadability, and the content can be increased, but fine pulverization to less than 30 μm may be technically difficult.

The content of wood flour is not particularly limited, and may be included in 0.5 to 10% of the total weight of the cosmetic composition. The content of wood powder may be appropriately selected within the above range in consideration of the particle size of wood powder, target UV protection efficiency, and dispersion with other components. For example, the larger the particle diameter of the wood powder, the lower the content of wood powder may be, and the smaller the particle diameter, the larger the amount may be included. Specifically, when the particle diameter of wood powder is 100 μm or less, wood powder may be included in 5% or less of the total weight of the composition, and when the particle diameter of wood powder is 30 μm or less, wood powder may be included in 10% or less of the total weight of the composition, It is not limited.

In general, in the field of sunscreen cosmetics, ultraviolet rays can be divided into UVA (320 to 400 nm) and UVB (290 to 320 nm) depending on the wavelength.In the case of UVB with a short wavelength, an organic sunscreen, especially lignin extracted from wood It can be blocked by a sunscreen agent containing components such as, but in the case of UVA with a long wavelength, it is not completely blocked.

However, the cosmetic composition for scattering or reflecting ultraviolet rays comprising wood powder of the present invention may scatter or reflect not only UVB but also UVA.

In addition, the composition may block ultraviolet rays, and the blocking method may be that, for example, wood powder scatters or reflects ultraviolet rays, and wood powder may absorb ultraviolet rays, and preferably scatter or reflect ultraviolet rays. Can be. However, it is not limited thereto.

The wood powder may be mixed and used in a conventional cosmetic composition such as a moisturizing cream or a sunscreen, and preferably may be mixed with a sunscreen.

The sunscreen may be an ultraviolet absorber or an ultraviolet scattering/reflecting agent, and specifically, may be an ultraviolet absorber.

The ultraviolet absorber may be used without limitation, known in the art, for example, t-butylmethoxy dibenzoyl methane, diethylamino hydroxybenzoyl hexyl benzoate. , ethylhexyl triazol zone (ethylhexyl triazone), loam butylene dimethacrylate (octocrylene), octyl methoxycinnamate (octyl methoxycinnamate), isoamyl - p - methoxycinnamate (isoamyl- p -methoxycinnamate), bis-ethylhexyl phenol methoxy-oxyl methoxyphenyl-triazine (bis-ethylhexyloxyl phenolmethoxy phenyl triazine) , octyl salicylate (octyl salicylate), p - aminobenzoic acid (p -aminobenzoic acid), selected from the group consisting of benzophenone (benzophenones) and anthranilate rate (anthranilates) It may include at least one that is, preferably t-butylmethoxy dibenzoyl methane (t-butylmethoxy dibenzoyl methane) may be included.

When the wood powder is mixed with a conventional cosmetic composition, the UV blocking effect may be increased, and when mixed with a UV blocking agent, the UV blocking stability may be increased and a synergy effect for the UV blocking effect may be exhibited.

When 0.5 to 7% of coniferous wood powder of the total weight is mixed with a conventional cosmetic composition, for example, a moisturizing cream having an ultraviolet transmittance of 80 to 100%, the ultraviolet transmittance may be about 55 to 90%, and specifically, the soft wood powder is When 0.5 to 2% of the total weight is mixed with the cream, the ultraviolet transmittance may be 75 to 90%, and when the coniferous wood powder is mixed at 2.5 to 4% of the total weight, the ultraviolet transmittance may be 60 to 70%, When the coniferous wood powder is mixed at 4.5 to 7% of the total weight, the ultraviolet transmittance may be 55 to 65%, but is not limited thereto.

In addition, when 0.5 to 7% of the total weight of hardwood wood powder is mixed in the moisturizing cream, the ultraviolet transmittance may be about 60 to 90%, and specifically, the hardwood wood powder is 0.5 to 2% of the total weight. When mixed, the ultraviolet transmittance may be 75 to 90%, and when the hardwood wood powder is mixed at 2.5 to 4% of the total weight, the ultraviolet transmittance may be 65 to 80%, and the hardwood wood powder is at 4.5 to 7% of the total weight. When mixed, the ultraviolet transmittance may be 60 to 75%, but is not limited thereto.

In addition, when 0.5 to 7% of the total weight of the waste wood powder is mixed with the moisturizing cream, the ultraviolet transmittance may be about 70 to 90%, and specifically, the waste wood powder is 0.5 to 2% of the total weight. When mixed in a cream, the UV transmittance may be 75 to 90%, and when the waste wood powder is mixed at 2.5 to 4% of the total weight, the ultraviolet transmittance may be 75 to 85%, and the waste wood powder is 4.5 to 4% of the total weight. When mixed at 7% to 7%, the ultraviolet transmittance may be 70 to 85%, but is not limited thereto.

In addition, when 4 to 7% of the total weight of the wood flour is mixed with the moisturizing cream, the sun protection factor (SPF) may increase from 1.1 to about 1.3 to 1.5, but is not limited thereto.

When 0.5 to 7% of the total weight of the wood powder is mixed with a sunscreen, the sun protection index (SPF) may increase by 0.1 to 30, and specifically, 0.5 to 7% of the total weight of the softwood wood powder is mixed with the sunscreen. If it is, the UV protection index (SPF) may increase by 3 to 30, and when 0.5 to 7% of the total weight of hardwood wood powder is mixed with the sunscreen, the UV protection index (SPF) may increase by 0.5 to 20, and , When 0.5 to 7% of the total weight of the waste wood powder is mixed with a sunscreen, the sunscreen index (SPF) may increase by 0.1 to 15, but is not limited thereto.

More specifically, when 0.5 to 2% of the total weight of coniferous wood powder is mixed with the sunscreen, the amount of increase in the UV protection index may be 3 to 15, and when the coniferous wood powder is mixed at 2.5 to 4% of the total weight, UV protection The increase in the index may be 5 to 10, and when the coniferous wood powder is mixed at 4.5 to 7% of the total weight, the increase in the UV blocking index may be 15 to 30, but is not limited thereto.

In addition, when 0.5 to 2% of the total weight of hardwood wood powder is mixed with the sunscreen, the amount of increase in the UV protection index may be 0.5 to 10, and when the hardwood wood powder is mixed at 2.5 to 4% of the total weight, the amount of increase in the UV protection index May be 2 to 15, and when the hardwood wood powder is mixed at 4.5 to 7% of the total weight, the amount of increase in the UV blocking index may be 4 to 20, but is not limited thereto.

In addition, when 0.5 to 2% of the total weight of the waste wood powder is mixed with the sunscreen, the amount of increase in the sun protection index may be 0.1 to 5, and when the waste wood powder is mixed with 2.5 to 4% of the total weight, UV protection The increase in the index may be 1 to 7, and when the waste wood powder is mixed at 4.5 to 7% of the total weight, the increase in the UV protection index may be 2 to 15, but is not limited thereto.

When the wood powder is mixed with a sunscreen, the stability against ultraviolet irradiation of the sunscreen may be increased, specifically, 0.5 to 2% of the total weight in cosmetics containing 2 to 5% of the total weight of the sunscreen When the wood flour of wood powder is mixed, the ultraviolet transmittance of about 1 to 60% may be reduced for 2 hours, and more specifically, the ultraviolet transmittance at a wavelength of 300 nm may decrease by about 10 to 50% in the case of coniferous wood flour for 2 hours. In the case of hardwood wood powder, it may be reduced by about 20 to 60%, and in the case of waste wood powder, it may be reduced by about 5 to 40%, but is not limited thereto.

In addition, the UV transmittance at a wavelength of 360 nm may decrease by about 20 to 60% in the case of coniferous wood flour for 2 hours, about 15 to 45% in the case of hardwood wood flour, and about 15 to 40 in the case of waste wood powder. % May be reduced, but is not limited thereto.

In addition, the cosmetic composition of the present invention may additionally include components conventionally added to the cosmetic composition, such as antioxidants, stabilizers, solubilizers, vitamins, pigments, and conventional adjuvants and carriers such as fragrances.

The cosmetic composition may be prepared in any formulation commonly prepared in the art, for example, solution, suspension, emulsion, paste, gel, cream, lotion, powder, soap, surfactant-containing cleansing, oil , Powder foundation, emulsion foundation, wax foundation, and spray may be formulated, but are not limited thereto. More specifically, lotions such as flexible lotions or nutritious lotions, emulsions such as facial lotions and body lotions, creams such as nutritional creams, moisture creams, eye creams, essences, cosmetic ointments, sprays, gels, packs, sunscreens, and makeup It can be prepared in a formulation such as a foundation, a powder, such as a base, a liquid type, a solid type, or a spray type. In this case, the cosmetic composition is an emulsifier, a soap acid, a solvent, a colorant, a preservative, an antioxidant, an antifoaming agent, an antibacterial agent, an anti-redeposition agent, an enzyme, a plant or mineral oil, a fat, a fluorescent substance, a fungicide, a hydrophobic substance, a moisturizer, It may contain excipients including fragrances, fragrance carriers, preservatives, proteins, silicones, solubilizers, sugar derivatives, sunscreen agents, vitamins, plant extracts, waxes, and the like.

When the formulation of the cosmetic composition is a paste, cream, or gel, animal oil, vegetable oil, wax, paraffin, starch, tragacanth, cellulose derivative, polyethylene glycol, silicone, bentonite, silica, talc, or zinc oxide are used as carrier components. Can be used.

When the formulation of the cosmetic composition is a powder or spray, toss, talc, silica, aluminum hydroxide, calcium silicate, or polyamide powder may be used as a carrier component. In particular, in the case of a spray, additional chlorofluorohydrocarbon, Propellants such as propane/butane or dimethyl ether.

When the formulation of the cosmetic composition is a solution or emulsion, a solvent, solubilizing agent or emulsifying agent is used as a carrier component, such as water, ethanol, isopropanol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butylglycol oil, glycerol aliphatic ester, polyethylene glycol or fatty acid ester of sorbitan.

When the formulation of the cosmetic composition is a suspension, as a carrier component, a liquid diluent such as water, ethanol or propylene glycol, an ethoxylated isostearyl alcohol, a suspending agent such as polyoxyethylene sorbitol ester and polyoxyethylene sorbitan ester, Crystalline cellulose, aluminum metahydroxide, bentonite, agar or tragacanth, and the like may be used.

Hereinafter, examples will be described in detail to illustrate the present invention in detail.

Example

Example 1. Color comparison according to the type of wood flour

Wood powder was provided by G Biotech Co., Ltd., and wood powder obtained by crushing and crushing softwood and hardwood logs and waste wood powder obtained by crushing and crushing wood waste (floor, etc.) were used.

The color of wood powder used in the present invention was compared to FIG. 1. As can be seen in Fig. 1, wood powder obtained by crushing coniferous trees had the brightest color. And the color was compared numerically using a spectrophotometer (Konica Minolta CM-2600d). The color of the sample was measured using the SCI (specular component included) mode, which measures the total amount of reflection including regular reflection, and the SCE (specular component excluded) mode, which measures the color of the substance itself by measuring only diffuse reflection excluding the regular reflection. (Table 1), CIE L ^* a ^* b ^* expressed as a numerical value using the color space. L ^* a ^* b ^* in the CIE color space L ^* value indicates the case of L ^* = 100 in the case of white, L ^* = 0 indicates the brightness for black. In this color space, +a ^* is the red direction, -a ^* is the green direction, +b ^* is the yellow direction, and -b ^* is the blue direction. Meanwhile, ΔE is a color difference value calculated according to Equation 1 below.

[Equation 1]

△E = [(△L ^* ) ² + (△a ^* ) ² + (△b ^* ) ² ] ^1/2

In general, when △E = 2 or more, two colors can be distinguished visually.

sample SCI SCE L* a* b* ΔE L* a* b* ΔE White standard 99.5 -0.1 -0.1 0.0 97.3 -0.1 0.1 0.0 Coniferous wood flour 75.9 5.1 19.5 31.1 69.2 5.8 24.3 37.5 Hardwood wood flour 73.3 5.4 16.7 31.6 66.4 6.2 21.2 37.9 Waste wood powder 68.9 5.1 13.6 33.9 61.2 6.0 18.3 40.9 Kraft lignin 47.4 7.1 10.5 53.7 34.0 11.0 21.5 67.7

Example 2. Ultraviolet transmission spectrum of wood flour mixed cream

In order to find out whether wood powder exhibits UV protection when it is mixed with a cosmetic cream, UV blocking ability was investigated after mixing wood powder and NIVEA refreshingly soft moisturizing cream. To this end, wood flour was mixed with the cream in a weight ratio (1, 3, 5%) and mixed at 600 rpm for 24 hours in a dark room condition at room temperature. Transpore tape was attached on the cleaned quartz plate to prepare, and wood powder mixed cream was dropped onto the plate in an amount of 2 mg/cm ² , and finger coating was applied. After drying in a dark room at room temperature for 20 minutes, the transmittance spectrum was measured using a UV-Vis spectrometer (Cary 50).

As a result of the experiment, it was found that wood flour has UV blocking ability, and unlike organic sunscreens, both UVB and UVA could be blocked (FIGS. 2 to 4). Compared with the moisturizing cream, it was found that the UV blocking ability also increased as the concentration of wood flour increased. Compared to the powder obtained from waste wood, wood powder obtained from solid wood had higher UV-blocking ability. The UV protection factor (SPF) was calculated from the UV transmission spectrum. Moisturizing cream showed a value of 1.1, and there was a subtle difference in the case of wood flour blended cream with a 5% weight ratio, but showed a value between about 1.3 and 1.5.

Example 3. Comparison of color of wood powder mixed cream

The color of the moisturizing cream in which wood flour was mixed with 1% of the total weight was measured. When comparing the cream in which the three types of wood powder were mixed with the naked eye, a major difference could not be distinguished (FIG. 5 ).

From the color difference data shown in Table 2, it can be seen that the color of wood powder obtained from conifers is the brightest. Compared with the color difference data of the existing moisturizing cream, there was no significant difference.

sample SCI SCE L* a* b* ΔE L* a* b* ΔE White standard 99.5 -0.1 -0.1 0.0 97.3 -0.1 0.1 0.0 Moisturizing cream 80.8 -0.0 1.5 18.7 78.7 0.0 1.9 18.7 Coniferous wood flour 77.7 1.4 6.9 23.0 75.4 1.5 7.5 23.1 Hardwood wood flour 75.1 1.5 7.3 25.5 73.2 1.6 7.8 25.3 Waste wood powder 74.0 2.1 7.0 26.6 71.8 2.2 7.6 26.6

Example 4. Synergistic effect of UV protection between wood powder and sunscreen

To see if wood powder can improve UV protection as an auxiliary component of existing sunscreens, in the same manner as in Example 2, wood powder was mixed with two commercially available sunscreens (BIOTHERM SPF 15 and KIEHL SPF 15) to block UV rays. The index was measured. BIOTHERM sunscreen without wood powder showed about SPF 11, and sunscreen with wood powder significantly increased the sun protection index (Table 3). Interestingly, the degree of increase was more than simply adding the UV protection index of wood powder mixed with moisturizing creep. For example, when 5% coniferous wood powder was mixed with moisturizing cream, SPF increased by about 0.4 from about 1.1 to about 1.5, but when 5% mixed with BIOTHERM sun cream as shown in Table 3, SPF increased by about 26 from about 11 to about 37. I did. Similarly, as shown in Table 4, when 5% was mixed with KIEHL sunscreen, the SPF increased by about 19 from about 9 to about 28. This means that the mixed wood powder has a synergistic effect with the sunscreen's sunscreen material.

Mixed BIOTHERM Sun Cream SPF (290-400 nm) Wood flour mixing ratio (% by weight) 0 One 3 5 Coniferous wood flour 10.8 ± 2.5 24.1 ± 2.5 17.8 ± 0.3 36.7 ± 1.1 Hardwood wood flour 19.5 ± 1.7 24.3 ± 1.7 30.0 ± 4.8 Waste wood powder 13.7 ± 1.1 15.3 ± 0.6 23.7 ± 2.3

Mixed KIEHL Sun Cream SPF (290-400 nm) Wood flour mixing ratio (% by weight) 0 One 3 5 Coniferous wood flour 8.8 ± 0.6 12.1 ± 1.0 14.3 ± 0.7 27.5 ± 2.8 Hardwood wood flour 9.4 ± 0.4 11.9 ± 1.2 23.6 ± 1.4 Waste wood powder 9.0 ± 0.7 9.9 ± 0.5 11.6 ± 0.3

Example 5. Effect of wood powder on photostability of organic sunscreen

It is well known that some of the sunscreens in commercial sunscreens have low stability against UV rays. The most representative UV blocking material showing low light stability is Avobenzone, which has the best blocking power against UVA. Accordingly, avobenzone (t-butylmethoxy dibenzoyl methane) was mixed with a moisturizing cream at a weight ratio of 3%, and then coated on a quartz plate in the same manner as in Example 2 to examine photostability. The effect of wood powder on the UV stability of avobenzone was investigated by mixing wood flour at a 1% weight ratio in the moisturizing cream mixed with benzone.

The transmittance spectrum measured while irradiating ultraviolet (UVA) for two hours is shown in FIGS. 6 and 7. After two hours of UV irradiation, the UV transmittance (300 nm) of the moisturizing cream mixed with avobenzone increased from 64% to 78%. On the other hand, when wood flour was added, the UV transmittance was rather decreased (Fig. 6). On the other hand, the transmittance of the avobenzone mixed cream at 360 nm increased significantly from 48% to 89% after irradiation with ultraviolet rays for two hours. This is because avobenzone is decomposed by ultraviolet rays, so the change in transmittance of UVA (300 nm) was larger than that of UVB (360 nm), and this rapid increase in transmittance was improved when wood flour was mixed. There is (Fig. 7).

For example, when coniferous wood flour was mixed, the UV transmittance increased relatively little from 23% to 41%. It can be seen from FIGS. 6 and 7 that wood flour can improve the UV stability of avobenzone. Even when wood powder was mixed with avobenzone-containing sunscreen, the increase in transmittance due to ultraviolet irradiation could be reduced similarly to FIGS. 6 and 7.

Example 6. Color comparison of wood powder blended sunscreen

The color of the BIOTHERM sunscreen in which wood flour was mixed in a 1% weight ratio was measured. As shown in FIG. 8, the color of the mixed sunscreen according to the type of wood powder did not show a significant difference. When compared to sunscreen, it was also indistinguishable with the naked eye.

In addition, looking at the color difference data shown in Table 5, it can be seen that the L ^* value of the powder obtained by grinding wood is high. As in Example 3, when compared with a commercially available sunscreen, the color of the wood powder blended cream did not show a significant difference when viewed with the naked eye or color difference data.

sample SCI SCE L* a* b* △E L* a* b* △E White standard 99.5 -0.1 -0.1 0.0 97.3 -0.1 0.1 0.0 Sunscreen 80.2 -1.7 6.9 20.6 78.4 -1.6 7.3 20.3 Coniferous wood flour 73.5 -0.4 10.4 28.0 71.1 -0.4 11.1 28.4 Hardwood wood flour 72.2 0.4 11.2 29.5 70.2 0.4 11.9 29.6 Waste wood powder 69.9 1.7 10.7 31.6 67.3 1.8 11.7 32.2

Claims (8)

Coniferous wood containing wood powder, the wood powder particle diameter less than 200㎛, UV scattering or reflection cosmetic composition.
delete delete The method according to claim 1, wherein the wood powder is containing 0.5 to 10% of the total weight of the composition, UV scattering or reflection cosmetic composition.
The method according to claim 1, wherein the ultraviolet rays include UVA, ultraviolet scattering or reflection cosmetic composition.
The cosmetic composition of claim 1, further comprising an ultraviolet absorber.
The method of claim 6, wherein the ultraviolet absorber is t-butylmethoxy dibenzoyl methane, diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl triazone, octo butylene dimethacrylate (octocrylene), octyl methoxycinnamate (octyl methoxycinnamate), isoamyl - p - methoxycinnamate (isoamyl- p -methoxycinnamate), bis-ethylhexyl phenol oxyl-methoxyphenyl-triazine (bis-phenyl triazine ethylhexyloxyl phenolmethoxy ), octyl salicylate (octyl salicylate), p -aminobenzoic acid ( p -aminobenzoic acid), benzophenones (benzophenones) and anthranilate (anthranilates) containing at least one selected from the group consisting of, ultraviolet scattering Or a cosmetic composition for reflection.
The method of claim 7, wherein the ultraviolet absorber is t-butylmethoxy dibenzoyl methane (t-butylmethoxy dibenzoyl methane), UV scattering or reflection cosmetic composition.

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