JP2013056860A - Skin cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skin cosmetic with a uniformly dispersed component for preventing ultraviolet and having high preventing effect on ultraviolet.SOLUTION: The skin cosmetic contains zinc oxide and zinc titanium as a component for preventing ultraviolet, in which the zinc oxide is contained as a complex particle included by a matrix component selected from a thermoplastic resin, thermoplastic elastomer, and gum.

Description

  The present invention relates to a skin cosmetic suitable for sunscreen.

Various cosmetics containing organic and inorganic ultraviolet protection components are known.
Patent Document 1 discloses an invention of a sunscreen cosmetic comprising a UV absorber such as diethylaminohydroxybenzoyl hexyl benzoate and a spherical resin powder containing 35% or more of ultrafine titanium oxide hydrophobized inside. It is disclosed.
The object of the present invention is to solve the problem of cosmetics adhering to and soiling clothes.

  Patent Document 2 discloses a method for producing spherical composite particles in which zinc oxide or titanium oxide is coated with a resin, and cosmetics are described as uses of the obtained spherical composite particles.

JP 2011-068567 A JP 2010-132811 A

  This invention makes it a subject to provide the skin cosmetics which have a high ultraviolet-ray prevention effect from the zinc oxide and titanium oxide as an ultraviolet-ray prevention component disperse | distributing uniformly.

As a means for solving the problems,
It is a skin cosmetic containing zinc oxide and titanium oxide as ultraviolet ray preventing components,
Provided is a skin cosmetic wherein the zinc oxide is contained as composite particles in which zinc oxide particles are encapsulated in a matrix component selected from a thermoplastic resin, a thermoplastic elastomer and rubber.

  The skin cosmetic of the present invention exists in a state where zinc oxide and titanium oxide, which are contained as ultraviolet ray preventing components, are uniformly dispersed without aggregation. For this reason, when applied to the skin, zinc oxide and titanium oxide can be uniformly dispersed on the skin, so that the effect of preventing ultraviolet rays is high and there is no variation.

The skin cosmetic of the present invention contains zinc oxide and titanium oxide as ultraviolet ray preventing components. Zinc oxide is a matrix component in which zinc oxide particles are selected from a thermoplastic resin, a thermoplastic elastomer and a thermoplastic rubber. It is contained as an encapsulated composite particle.
Here, “encapsulation” means that zinc oxide particles are dispersed and contained in the matrix component, but a part (for example, 10% by mass or less, preferably 5% by mass or less, more preferably 3% by mass or less) is also exposed on the surface of the composite particles.

  The content of the zinc oxide particles in the composite particles used in the present invention is preferably 20 to 70% by mass, more preferably 30 to 60% by mass in order to enhance the ultraviolet ray preventing effect and increase the dispersibility in the cosmetic. .

The composite particles used in the present invention preferably have an average particle size in the range of 0.5 to 50 μm, and more preferably in the range of 1 to 15 μm. This average particle diameter can be measured by a laser diffraction / scattering laser distribution device or a scanning electron microscope (SEM).
The composite particles used in the present invention satisfy the above average particle size range, and those having a particle size in the range of 1 to 15 μm are preferably 80% by mass or more, and 90% by mass or more. Is more preferably 95% by mass or more.
The zinc oxide particles encapsulated in the composite particles used in the present invention preferably have an average particle size in the range of 5 to 100 nm, and more preferably in the range of 10 to 50 nm. This average particle diameter can be measured by a laser diffraction / scattering laser distribution device or a scanning electron microscope (SEM).

  The composite particles used in the present invention are obtained, for example, by the method described in paragraph No. 0027 of Patent Document 1 (Japanese Patent Laid-Open No. 2011-068567) or the manufacturing method of the invention of Patent Document 2 (Japanese Patent Laid-Open No. 2010-132811). Can be manufactured.

  The thermoplastic resin used as the matrix component includes polyamide resins (nylon 6, nylon 66, nylon 12, nylon 612, nylon 1010, etc.), polyester resins, polyurethane resins, styrene resins, acrylic resins, olefin resins. , Vinyl resins, cellulose resins, polyether resins, various elastomers, polyarylate, polyphenylene sulfide, polysulfone, polyether sulfone, polycarbonate, polyphenylene ether, polyether ether ketone, and the like.

As the thermoplastic elastomer, known elastomers having a hard segment and a soft segment in the molecule can be used. Polyamide thermoplastic elastomer (TPAE), polyester thermoplastic elastomer (TPEE), polyurethane thermoplastic elastomer ( TPU), polystyrene-based thermoplastic elastomer (TPS), fluoropolymer-based thermoplastic elastomer, polyolefin-based elastomer (TPO), and the like.
As the polyamide-based thermoplastic elastomer, a polyamide elastomer having a polyamide component such as polyamide 6 or polyamide 12 and a polyether component composed of polyether diol as a hard segment and a soft segment, respectively, is preferable.

  As rubber, isoprene rubber (IR), butadiene rubber (BR), chloroprene rubber (CR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber [ethylene-propylene co-polymer] Polymer (EPM), ternary ethylene-propylene rubber (EPDM)], acrylic rubber (ACM, ANM, etc.), epichlorohydrin rubber, silicone rubber, fluoro rubber (FKM), urethane rubber (AU), chlorosulfonated polyethylene (CSM) and the like.

  The composite particles used in the present invention are preferably spherical (one having a maximum outer diameter / minimum outer diameter ratio close to 1), and more preferably spherical (one having the above ratio of 1).

  Titanium oxide contained in the skin cosmetic of the present invention is not included in the matrix component forming the composite particles described above, but is contained as particles made of only titanium oxide. However, as a manufacturing raw material, it can be used as a mixture with an oil agent (an oil agent known as a cosmetic ingredient) or the like.

In the skin cosmetic of the present invention, the total content of zinc oxide and titanium oxide is preferably 0.5 to 50% by mass, more preferably 3 to 45% by mass, and still more preferably 5 to 35% by mass.
The ratio of zinc oxide and titanium oxide is preferably 2 to 50% by mass of zinc oxide, more preferably 5 to 30% by mass, and preferably 98 to 60% by mass of titanium oxide in the total amount (100% by mass) thereof. More preferably, it is 95-70 mass%.

The skin cosmetic of the present invention can further contain a UV absorber made of a known organic compound as a UV protection component.
Examples of such an ultraviolet absorber include p-aminobenzoic acid or its ester, salicylic acid ester, benzyl cinnamate, hexyl diethylaminohydroxybenzoylbenzoate, ethylhexyl methoxycinnamate, 2,4-bis {[4- (2- Ethylhexyloxy) -2-hydroxy] -phenyl} -6- (4-methoxyphenyl) -1,3,5-triazine, 4-tert-butyl-4-methoxydibenzoylmethane, 2-hydroxy-4-methoxybenzophenone + Etc.

The skin cosmetic of the present invention can further contain various inorganic fillers known as cosmetic ingredients (however, zinc oxide and titanium oxide are not included) and organic fillers.
Inorganic fillers include calcium carbonate, magnesium carbonate, clay, kaolin, calcium phosphate, hydroxyapatite, mica, talc, silica, quartz powder, glass powder, diatomaceous earth, nepheline sinite, cristobalite, wollastonite, aluminum hydroxide, oxidation Examples thereof include iron, alumina, calcium sulfate, magnesium oxide, barium sulfate, dolomite, silicon carbide, silicon nitride, boron nitride, various metal powders, graphite, ferrite, and carbon black. Other examples include antibacterial fillers (hydroxyapatite silver, zeolite silver, etc.) on which a metal having an antibacterial function such as silver, copper, and zinc is supported.
Examples of the organic filler include organic pigments such as carbon black, carbon nanotubes, carbon fibers, and phthalocyanine, and particulates of various polymers such as crosslinked polymethyl methacrylate.

The skin cosmetic of the present invention can further contain a colorant selected from inorganic and organic colorants.
Examples of the inorganic colorant include inorganic pigments such as carbon black, titanium oxide, ultramarine blue, red pepper, black iron oxide, yellow iron oxide, chromium oxide, and complex oxide pigments.
Examples of the organic colorant include azo pigments; organic pigments such as anthraquinone, phthalocyanine blue, phthalocyanine green, quinacridone, and diketopyrrolopyrrole; and other organic pigments, as well as disperse dyes and oil dyes for resins. be able to.
Further, various tar pigments defined in Ministry of Health and Welfare Ordinance No. 30 used in cosmetics; lake pigments such as aluminum lakes, and the like are also preferably used.
These colorants can be used as composite particles by the same method as the zinc oxide composite particles described above.

  The skin cosmetics of the present invention contain known cosmetic ingredients such as oils, alcohols, stabilizers, film forming agents, emulsifiers, fragrances, preservatives, antioxidants, medicinal ingredients, bulking agents and the like as other ingredients. be able to.

  The skin cosmetics of the present invention can be used in the form of liquids such as lotions, emulsions, creams, gels, and powders, granules, kneads, solids such as molded bodies, creams, foundations, faces It can be made into powder, eye shadow, eyeliner, mascara, sunscreen, lip balm, hand cream, body cream, scrub agent, pack agent, lotion, milky lotion, beauty essence and the like.

The skin cosmetic of the present invention is particularly suitable as a two-phase separated skin cosmetic containing an oil phase and an aqueous phase, containing 30 to 50% by mass of water.
Such a two-phase separation type skin cosmetic contains composite particles containing zinc oxide as an ultraviolet ray preventing component, titanium oxide, an oil agent, a film forming agent, an emulsifier and water, and the water content is 30 to 50. What is mass% is preferable.

The skin cosmetic of the present invention contains composite particles containing zinc oxide and titanium oxide as an ultraviolet ray preventing component. When these composite particles and titanium oxide are mixed, they are uniformly dispersed without agglomeration. Therefore, the ultraviolet protection component is uniformly dispersed in the skin cosmetic.
For this reason, in use, since zinc oxide and titanium oxide can be applied in a state of being spread uniformly on the skin, the ultraviolet ray preventing effect is evenly exhibited.

The skin cosmetic of the present invention can be produced, for example, by the following procedure.
Composite particles containing zinc oxide and titanium oxide are mixed (mixture 1).
Mix the other ingredients (mixture 2).
Mixture 1 and mixture 2 are mixed (mixture 3).
In the case of a form containing water, water is added to the mixture 3. When the mixture 2 contains an emulsifier, the mixture 3 is emulsified while adding water. When the preservative is contained, the preservative is dissolved or dispersed in water in advance.

Example 1 and Comparative Example 1
Shaking type (type used after shaking) skin cosmetics separated into two upper and lower layers shown in Table 1 were prepared. The content of titanium oxide in the cosmetics of Example 1 and Comparative Example 1 is 19.0% by mass, and the content of zinc oxide is 2.50% by mass.

<Procedure 1>
In Example 1, (1), (2), (5), and (6) were uniformly mixed and dispersed (mixture A).
In Comparative Example 1, (1), (2), (5), (7), and (8) were uniformly mixed and dispersed (mixture B).
<Procedure 2>
In both Example 1 and Comparative Example 1, (3) and (4) were mixed and dissolved (mixture C).
<Procedure 3>
In both Example 1 and Comparative Example 1, (7) and (8) were mixed and dissolved (water mixture).
<Procedure 4>
The mixture C was added to the mixture A or the mixture B little by little and mixed and dispersed uniformly (mixture A + C or mixture B + C).
<Procedure 5>
A water mixture was added to the mixture A + C or the mixture B + C little by little and emulsified (2000 r / p for 2 minutes) to obtain the intended skin cosmetic.
About the obtained skin cosmetics, SPF and PA value were measured. The results are shown in Table 1.
SPF is an index of the prevention effect of UVB (wavelength 290 to 320 nm), and the larger the value, the higher the prevention effect of UVB.
The PA value is an index of the prevention effect of UVA (wavelength 320 to 400 nm), and the more “+”, the higher the prevention effect of UVA.
In addition, SPF and PA value were measured with the following method.

  SPF, PA value: The prepared sunscreen agent was applied to transpo tape and measured with an SPF analyzer (UVsphere 1000S manufactured by Labsphere).

As is clear from Table 1, in Example 1 and Comparative Example 1, a clear difference was observed in SPF and PA values.
This result is due to the fact that in Example 1, zinc oxide and titanium oxide as UV protection components were uniformly dispersed without agglomeration, but in Comparative Example 1, zinc oxide and titanium oxide were not uniformly dispersed. is there.

Solveil CT-200: Mixture of titanium oxide, isohexadecane, trioctanoin, stearic acid, alumina, polyhydroxystearic acid (manufactured by Croda Japan)
SS3408: Caprylyl methicone (oil) (Toray Dow Corning)
SH245: Cyclopentasiloxane (oil) (Toray Dow Corning)
BY11-018: Mixture of trimethylsiloxysilicic acid and cyclomethicone (film-forming agent) (Toray Dow Corning)
ES-5612: Mixture with PEG-10 dimethicone (emulsifier) (Toray Dow Corning)
MSP-ZNO-50: Composite particles in which 50% by mass of zinc oxide is encapsulated in nylon 12 (manufactured by Daicel-Evonik)
MSP-100: Nylon 12 new sphere powder (manufactured by Daicel-Evonik)
ZONEN MT-10: Methylisothiazoline (preservative) (Chemclea)

Claims (6)

It is a skin cosmetic containing zinc oxide and titanium oxide as ultraviolet ray preventing components,
A skin cosmetic, wherein the zinc oxide is contained as composite particles in which zinc oxide particles are encapsulated in a matrix component selected from a thermoplastic resin, a thermoplastic elastomer and rubber.   The skin cosmetic according to claim 1, wherein the content of zinc oxide particles in the composite particles is 30 to 70% by mass.   3. The composite particle according to claim 1, wherein the composite particle has an average particle diameter in the range of 1 to 10 μm, and the included zinc oxide particles have an average particle diameter in the range of 0.5 to 50 nm. Skin cosmetics.   Furthermore, the skin cosmetics of any one of Claims 1-3 which contain the ultraviolet absorber which consists of an organic compound as a ultraviolet-ray prevention component.   The skin cosmetic according to any one of claims 1 to 4, which is a two-phase separation type of an oil phase and an aqueous phase, further containing 30 to 50% by mass of water.   Two-phase separation of an oil phase and an aqueous phase, containing composite particles containing zinc oxide as an ultraviolet protection component, titanium oxide, an oil agent, a film forming agent, an emulsifier and water, and a water content of 30 to 50% by mass The skin cosmetic according to any one of claims 1 to 5, which is a mold.