WO2022249695A1 - 液状組成物 - Google Patents
液状組成物 Download PDFInfo
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- WO2022249695A1 WO2022249695A1 PCT/JP2022/013642 JP2022013642W WO2022249695A1 WO 2022249695 A1 WO2022249695 A1 WO 2022249695A1 JP 2022013642 W JP2022013642 W JP 2022013642W WO 2022249695 A1 WO2022249695 A1 WO 2022249695A1
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- Prior art keywords
- zinc oxide
- liquid composition
- particles
- metal compound
- weight
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/0241—Containing particulates characterized by their shape and/or structure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/25—Silicon; Compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/27—Zinc; Compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/29—Titanium; Compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
- A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/04—Compounds of zinc
- C09C1/043—Zinc oxide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/12—Treatment with organosilicon compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
- C09K23/54—Silicon compounds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/41—Particular ingredients further characterized by their size
- A61K2800/412—Microsized, i.e. having sizes between 0.1 and 100 microns
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/41—Particular ingredients further characterized by their size
- A61K2800/413—Nanosized, i.e. having sizes below 100 nm
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/42—Colour properties
- A61K2800/43—Pigments; Dyes
- A61K2800/434—Luminescent, Fluorescent; Optical brighteners; Photosensitizers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/60—Particulates further characterized by their structure or composition
- A61K2800/61—Surface treated
- A61K2800/612—By organic compounds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/60—Particulates further characterized by their structure or composition
- A61K2800/61—Surface treated
- A61K2800/614—By macromolecular compounds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/60—Particulates further characterized by their structure or composition
- A61K2800/65—Characterized by the composition of the particulate/core
- A61K2800/651—The particulate/core comprising inorganic material
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
Definitions
- the present invention relates to a liquid composition and a redispersion facilitating agent.
- the metal compound particles contained in cosmetics and paints are used as raw materials with various functions.
- this metal compound particle has a feature that various effects can be obtained depending on the difference in size (average particle diameter).
- Metal compound particles with a large average particle size are sometimes used as white pigments as coloring agents, and those with a small average particle size have an excellent UV-blocking effect. It functions as a body and is used in sunscreen cosmetics.
- zinc oxide particles scatter both UVA and UVB rays of ultraviolet light, they are used as an ultraviolet scattering agent in ointments, creams and lotions to protect against sunburn and other ultraviolet-induced skin damage. There is Moreover, some zinc oxide particles are used as phosphors, and all of them are used in cosmetics and the like.
- Magnesium titanate particles become phosphors by doping with manganese, and are used in cosmetics and the like (Patent Document 1).
- Titanium mica is obtained by coating muscovite as a base material with a thin layer of titanium oxide on its surface, and has colored reflective interference colors such as red, yellow, blue, and green, and is usually used in cosmetics as a pearlescent agent. It is used.
- bismuth oxychloride As a pigment, bismuth oxychloride (BiOCl) has a unique soft luster and is non-toxic, so it is used by blending it in various cosmetics such as makeup cosmetics and nail products.
- Barium sulfate is used as an additive for cosmetics such as skin creams and sunscreens.
- Calcium cerium phosphate (Ca 4 P 2 O 9 :Ce) partially doped with cerium in calcium phosphate is known as a phosphor (Patent Document 2), and is used as a matrix for cosmetic phosphor materials. It is used for a wide variety of purposes, such as suppressing makeup loss due to sebum absorption and realizing a soft focus effect due to light scattering.
- Metal compound particles with a large specific gravity and a large particle size may precipitate in the liquid composition and form aggregates.
- the particle surface is modified (also called “surface treatment” or “coating") or a dispersant is used.
- a dispersant such as polyhydroxystearic acid is used to disperse zinc oxide of 100 nm or more (Patent Document 3).
- Coated barium sulfate is also said to impart favorable rheological properties to the application matrix and to be redispersible in adhesives, dyes, or cosmetic solvents (US Pat.
- a combination of carboxyvinyl polymer and amphoteric polymer is used (Patent Document 5).
- Alkylalkoxysilanes are used for surface treatment (hydrophobization treatment) of metal compound particles, and triethoxyoctyl zinc oxide, which functions as an ultraviolet scattering agent, is contained in, for example, makeup bases (Patent Document 6). .
- the redispersibility of aggregates generated by precipitation of metal compound particles in the liquid composition is not sufficient even with coating or addition of a dispersant. It takes a lot of effort to redisperse the metal compound particles generated in the liquid composition by stirring (or rotating), and if the liquid composition is used for a long time without being sufficiently redispersed, the component composition It is also conceivable that the expected effect of the liquid composition may be lost or the stability during storage may be deteriorated.
- C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide which is commonly used as a UV scattering agent, functions as a redispersion facilitating agent for metal compound particles, and that the metal compound particles and C A liquid composition containing 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide and having excellent redispersibility was found.
- the present invention provides (1) (A) C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles having an average particle size of 100 nm or less, and (B) a concentration of 0.2% by weight or more and a specific gravity of 3 above and metal compound particles having an average particle size of 1 ⁇ m or more,
- a liquid composition comprising: (2) The liquid composition according to (1), wherein the concentration of the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles is 1% by weight or more.
- the metal compound particles are selected from the group consisting of barium sulfate, titanium mica, zinc oxide, zinc oxide phosphor, magnesium titanate, magnesium titanate phosphor, calcium phosphate, calcium cerium phosphate phosphor, and bismuth oxychloride. Or the liquid composition according to any one of (1) to (3), which is a powder of multiple types. (5) Any of (1) to (4), wherein the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles are octyltriethoxysilane-treated zinc oxide particles or octyltrimethoxysilane-treated zinc oxide particles. The liquid composition according to (1).
- (11) 1 wherein the metal compound particles are selected from the group consisting of barium sulfate, titanium mica, zinc oxide, zinc oxide phosphor, magnesium titanate, magnesium titanate phosphor, calcium phosphate, calcium cerium phosphate phosphor, and bismuth oxychloride; Or the redispersion facilitating agent according to (9) or (10), which is a powder of multiple types. (12) Any of (9) to (11), wherein the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles are octyltriethoxysilane-treated zinc oxide particles or octyltrimethoxysilane-treated zinc oxide particles.
- (13) Use of the redispersion facilitating agent according to any one of (9) to (12) for redispersing metal compound particles that precipitate and aggregate in a liquid composition.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide according to the present invention is suitable for redispersing precipitable metal compound particles in liquid compositions. Since the liquid composition of the present invention containing metal compound particles and C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide has excellent redispersibility, it requires little effort such as stirring (or rotating) during use. It is suitable for long-term use because it can be used immediately, and there is little deviation in the composition of ingredients due to long-term use.
- ⁇ when applied to numerical values refers to a range of values that fall within the range of the specified reference value or more and the specified reference value or less.
- Alkoxysilane is a silane compound having an alkyl group of 5 to 10 carbon atoms and three alkoxy groups of 1 to 3 carbon atoms and reactive with a zinc oxide compound.
- These silane compounds are silane compounds represented by the following general formula (1).
- RSiX3 (1) (R represents an alkyl group having 5 to 10 carbon atoms (which may be linear or branched), and each X independently represents an alkoxy group having 1 to 3 carbon atoms.)
- the alkyl group represented by R is an alkyl group having 5 to 10 carbon atoms, and includes a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, and a decyl group. It may be a chain or a branched chain.
- Examples of the alkoxy group represented by X in the above general formula (1) include alkoxy groups having 1 to 3 carbon atoms such as methoxy, ethoxy, propoxy and isopropoxy groups.
- silane compounds include, for example, pentyltrimethoxysilane, hexyltrimethoxysilane, heptyltrimethoxysilane, octyltrimethoxysilane, nonyltrimethoxysilane, decyltrimethoxysilane, pentyltriethoxysilane, hexyltriethoxysilane, heptyl triethoxysilane, octyltriethoxysilane, nonyltriethoxysilane, decyltriethoxysilane, pentyltripropoxysilane, hexyltripropoxysilane, heptyltripropoxysilane, octyltripropoxysilane, nonyltripropoxysilane, decyltripropoxysilane, pentyl triisopropoxysilane, hexyltriisopropoxysilane,
- octyltriethoxysilane and octyltrimethoxysilane are particularly preferred.
- the silane compound is characterized in that it can be easily treated uniformly, that it is easy to supply, and that it is inexpensive. Excellent redispersibility of compound particles.
- the silane compound and zinc oxide particles are mixed in an organic solvent such as n-hexane, cyclohexane, or a lower alcohol, and optionally pulverized. is removed by heating or under reduced pressure, and the silane compound is chemically reacted with a reactive group (such as an alkoxy group) on the surface of the zinc oxide particle powder, preferably by heat treatment at 80 to 250°C.
- an organic solvent such as n-hexane, cyclohexane, or a lower alcohol
- optionally pulverized is removed by heating or under reduced pressure, and the silane compound is chemically reacted with a reactive group (such as an alkoxy group) on the surface of the zinc oxide particle powder, preferably by heat treatment at 80 to 250°C.
- JP-A-2007-326902 may be used to coat zinc oxide particle powder with a specific polysiloxane compound, and then surface-treat the silane compound or silazane compound in water.
- the silane compound is applied to the surface of the inorganic oxide-treated zinc oxide particle powder.
- a coating method is also included.
- the method for producing the inorganic oxide-treated zinc oxide particle powder include conventionally known treatment methods such as a wet treatment method using a solvent and a mechanochemical method.
- the method described in WO98/17730 may be used to obtain a silica-coated zinc oxide particle powder by coating the surface of the zinc oxide particle powder with a silicone compound and firing the coated powder.
- the coating amount of the silane compound on the zinc oxide particle powder is preferably 3 to 15% by mass, more preferably 4 to 10% by mass, based on the total amount of the zinc oxide particle powder used. Within this range, the zinc oxide particle powder surface is uniformly coated with the silane compound, and the silane compound does not agglomerate or precipitate on the zinc oxide particle powder surface.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles of the present invention preferably have an average particle size of 200 nm or less, 100 nm or less, 50 nm or less, or 40 nm or less, more preferably 50 nm or less, or 40 nm. or less or 35 nm or less.
- the average particle size of the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles is preferably smaller than the average particle size of the metal compound. 1/10 or less, 1/20 or less, 1/30 or less, 1/40 or less, 1/50 or less, 1/90 or less, 1/100 or less, 1/150 or less, or 1/200 or less. Within this range, excellent redispersibility characteristics are obtained when the metal compound particles contained in the liquid composition of the present invention are aggregated or precipitated.
- the amount of the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles used in the present invention is 0.1% by weight or more, 0.5% by weight or more, 1.0% by weight or more relative to the entire liquid composition. , 3% by weight or more, 5% by weight or more, 7% by weight or more, or 10% by weight or more, and 30% by weight or less, 25% by weight or less, 20% by weight or less, or 15% by weight or less, and 0.1-30% by weight, 0.5-30% by weight, 1-30% by weight, 3-30% by weight, 5-30% by weight, 7-30% by weight, 10-30% by weight based on the total liquid composition % by weight, 0.1-25% by weight, 0.5-25% by weight, 1-25% by weight, 3-25% by weight, 5-25% by weight, 7-25% by weight, 10-25% by weight, 0 .1-20% by weight, 0.5-20% by weight, 1-20% by weight, 3-20% by weight, 5-20% by weight, 7-20% by weight, 10-20%
- the “metallic compound particles” of the present invention mean organic or inorganic compounds containing metal atoms in the form of particles.
- the metal compound particles in the present invention are not particularly limited, but for example zinc oxide particles, magnesium titanate particles, calcium cerium phosphate particles, mica titanium particles, barium sulfate particles, titanium oxide particles, cerium oxide particles, zirconium oxide particles. Particles, iron oxide particles, bismuth oxychloride particles and the like can be mentioned, and these can be used singly or in combination of two or more.
- the average particle diameter (before aggregation) of the metal compound particles used in the present invention is, for example, 0.1 ⁇ m or more, 0.5 ⁇ m or more, 1 ⁇ m or more, 2 ⁇ m or more, or 3 ⁇ m or more, and 300 ⁇ m or less, 250 ⁇ m or less, 200 ⁇ m or less, 150 ⁇ m. 100 ⁇ m or less, 80 ⁇ m or less, 50 ⁇ m or less, 30 ⁇ m or less, 20 ⁇ m or less, or 10 ⁇ m or less, and the average particle size range is 0.1 to 200 ⁇ m, 0.1 to 150 ⁇ m, 0.1 to 100 ⁇ m, 0.1 ⁇ m or less.
- the average particle size of the metal compound used in the present invention is preferably larger than the average particle size of the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles, for example, C 5-10 alkyltri-C 1 -3 10 times or more, 20 times or more, 30 times or more, 40 times or more, 50 times or more, 80 times or more, 100 times or more, 150 times or more, or 200 times or more the average particle size of the alkoxysilane-treated zinc oxide particles .
- excellent redispersibility characteristics are obtained when the metal compound particles contained in the liquid composition of the present invention are aggregated or precipitated.
- the metal compound particles in the present invention have a specific gravity of 3 or more, 3.5 or more, 4 or more, 4.5 or more, or 5 or more, and 20 or less, 15 or less, 10 or less, 9 or less, 8 or less, or 7 or less. , or 6 or less, such as 3 to 20, 3 to 15, 3 to 10, 3 to 9, 3 to 8, 3 to 7, 3 to 6, 4 to 20, 4 to 15, 4 to 10, 4 to Specific gravity in the range of 9, 4-8, 4-7, 4-6, 5-20, 5-15, 5-10, 5-9, 5-8, 5-7 or 5-6.
- the metal compound particles used in the present invention are 0.1% by weight or more, 0.2% by weight or more, 0.5% by weight or more, 1.0% by weight or more, 3% by weight or more, or 5% by weight or more, 25% by weight or less, 20% by weight or less, 15% by weight or less, or 10% by weight or less; 2-25% by weight, 0.5-25% by weight, 1-25% by weight, 3-25% by weight, 5-25% by weight, 0.1-20% by weight, 0.2-20% by weight, 0.2-20% by weight; 5-20% by weight, 1-20% by weight, 3-20% by weight, 5-20% by weight, 0.1-15% by weight, 0.2-15% by weight, 0.5-15% by weight, 1- 15 wt%, 3-15 wt%, 5-15 wt%, 0.1-10 wt%, 0.2-10 wt%, 0.5-10 wt%, 1-10 wt%, 3-10 wt% %, or 5-10% by weight. Within this range, excellent redispersibility characteristics are obtained when the metal compound
- the shape of the metal compound particles of the present invention is not particularly limited, and may be spherical, needle-like, or plate-like.
- the "average particle size" in the present invention is a value obtained by measurement with an image analyzer (Luzex IIIU, manufactured by Nireco), for example, when the particles are not spherical.
- the metal compound particles in the present invention may be surface-treated.
- Surface treatments include, for example, silane compound treatment, silicone compound treatment, fluorine-modified silicone compound treatment, fluorine compound treatment, higher fatty acid treatment (stearic acid, etc.), higher alcohol treatment, fatty acid ester treatment, metallic soap treatment, amino acid treatment, alkylphos Fate processing and the like can be mentioned.
- the metal compound particles in the present invention may be phosphors.
- Phosphors include zinc oxide phosphors, magnesium titanate phosphors, calcium cerium phosphate phosphors, and the like, and the liquid composition of the present invention may contain one or more of these phosphors.
- a phosphor made of metal compound particles can be synthesized, for example, by the method described in JP-A-2019-167330.
- the C 5-10 alkyltri-C 1-3 alkoxysilane treated zinc oxide particles of the present invention increase the viscosity of liquid compositions.
- the viscosity of the liquid composition of the present invention is, for example, 500 mPa ⁇ s or more, 800 mPa ⁇ s or more, 1000 mPa ⁇ s or more, 1100 mPa ⁇ s or more, 1200 mPa ⁇ s or more, 1500 mPa s or more, 2000 mPa s or more, 2500 mPa s or more, or 3000 mPa s or more, 10000 mPa s or less, 9000 mPa s or less, 8000 mPa s or less, 7000 mPa s or less, 6000 mPa s or less, 5000 mPa s or less, or 4000 mPa s or less, and the viscosity range of the liquid composition of
- the metal compound particles contained in the liquid composition of the present invention precipitate and form aggregates when stored or left to stand.
- the redispersibility of compound particles is improved.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles of the present invention exhibit excellent effects, they precipitate together with the metal compound particles and surround the metal compound particles, thereby It may prevent agglomeration.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles may form a structure to increase the static viscosity of the entire liquid composition and prevent aggregation of the metal compound particles.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles have general versatility because they enhance redispersibility regardless of the type of the metal compound of the present invention.
- the metal compound particles are redispersible, and precipitated and aggregated by stirring (or rotating) only 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 times or less. Metal compound particles can be redispersed.
- the liquid composition of the present invention may contain a dispersant.
- a dispersant refers to a substance that can be uniformly dispersed in an aqueous or oily medium by adsorbing onto the surface of particles (powder) dispersed in an aqueous or oily phase.
- Preferred dispersants contained in the liquid composition of the present invention include PEG-10 dimethicone, bisbutyl dimethicone polyglyceryl-3, PEG-polydimethylpolysiloxane ethyl dimethicone, lauryl PEG-polydimethylpolysiloxane ethyl dimethicone, cetyl PEG/PPG.
- the content of the dispersant in the liquid composition of the present invention is preferably 0.01% by weight or more, preferably 0.05% by weight or more, more preferably 0.1% by weight or more, relative to the entire liquid composition. more preferably 0.2% by weight or more, and 20% by weight or less, preferably 15% by weight or less, more preferably 10% by weight or less, and still more preferably 5% by weight or less, 0.01 to 99.99% by weight, 0.1 to 99.9% by weight, 0.05 to 50% by weight, 0.1 to 40% by weight, 0.1 to 30% by weight of the total liquid composition %, 0.1-20% by weight, 0.1-10% by weight, 0.1-5% by weight, 0.2-40% by weight, 0.2-30% by weight, 0.2-20% by weight, 0.2-10 wt%, 0.2-5 wt%, 0.4-40 wt%, 0.4-30 wt%, 0.4-20 wt%, 0.4-10 wt% or 0.4-30 wt%. 4 to 5% by weight.
- Oil refers to a hydrophobic substance that phase separates from water, which is a component of the liquid composition of the present invention.
- Oils that can be used in the present invention are not particularly limited, and include, for example, at least one or more of hydrocarbon oils, ester oils, silicone oils, liquid fats, solid fats and higher alcohols.
- Hydrocarbon oils include liquid paraffin, tetraisobutane, hydrogenated polydecene, olefin oligomers, isododecane, isohexadecane, squalane, and hydrogenated polyisobutene.
- Ester oils include alkyl benzoate (e.g. alkyl (C 12-15 ) benzoate), diisopropyl sebacate, octyl palmitate, cetyl isooctanoate (cetyl 2-ethylhexanoate), triethylhexanoin, neopentyl dicaprate.
- alkyl benzoate e.g. alkyl (C 12-15 ) benzoate
- diisopropyl sebacate octyl palmitate
- cetyl isooctanoate cetyl 2-ethylhexanoate
- triethylhexanoin neopentyl dicaprate.
- Glycol, triisostearin diisostearyl malate, PPG-3 dipivalate, di-2-ethylhexyl succinate, 2-ethylhexyl 2-ethylhexanoate, polyglyceryl
- silicone oils examples include dimethicone, amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, and fluorine-modified polysiloxane.
- Liquid fats and oils include avocado oil, camellia oil, macadamia nut oil, mink oil, olive oil, castor oil, jojoba oil, triglycerin, and glycerin trioctanoate.
- Solid fats and oils include coconut oil, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, Japanese wax, and hydrogenated castor oil.
- higher alcohols include isostearyl alcohol, oleyl alcohol, copolymers of butylene glycol and propylene glycol (eg, PBG/PPG-9/1 copolymer).
- the total oil content that can be contained in the liquid composition of the present invention is 5% by weight or more, preferably 10% by weight or more, more preferably 12% by weight or more, relative to the total liquid composition. It is preferably 15% by weight or more.
- the liquid composition of the present invention can contain various components, as long as they do not affect the effects of the present invention.
- additive components that can be usually blended in cosmetics, for example, clay minerals (dimethyl distearyl ammonium hectorite, etc.), powders other than metal compound particles (polymethyl methacrylate, crosslinked silicone, network type Silicone block copolymer, silica, hydrophobized talc (dimethicone-treated talc, etc.), corn starch, hydrophobized polyurethane, etc.), coating agent (trimethylsiloxysilicate, dimethicone, etc.), percutaneous absorption inhibitor (polypropylene glycol (17 ), etc.), oil phase thickeners (dimethyldistearyl ammonium hectorite, dextrin palmitate, sucrose triacetate tetrastearate, etc.), UV absorbers (octocrylene, polysilicone-15, bisethylhexyl
- the liquid composition of the present invention is a water-in-oil composition.
- the water-in-oil composition of the present invention can be produced according to a normal production method. Specifically, the liquid composition in this embodiment is obtained by the following procedure. That is, an oily component is mixed to prepare an oil phase, and a water-soluble component is mixed to prepare an aqueous phase.
- the powder of C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles and the powder of metal compound particles can be dispersed in an aqueous phase or an oil phase, but are preferably dispersed in the same phase.
- a water-in-oil composition is obtained by adding the water phase to the oil phase and stirring.
- composition of the present invention includes liquid compositions used for sunscreen cosmetics such as makeup bases and sunscreen creams. Moreover, as a dosage form, it can be set as milky lotions etc., for example.
- Redispersion facilitating agent for metal compound particles One aspect of the present invention is C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles as a redispersion facilitating agent for metal compound particles.
- the “redispersion facilitating agent” means a compound that improves the redispersibility of the metal compound particles that have precipitated and aggregated in the liquid composition and facilitates the redispersion of the metal compound particles. do.
- the ability of the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles to function as a redispersant for the metal compound particles in the liquid composition can be confirmed by, for example, the method using stirring balls described in the following examples. , can be confirmed by reducing the number of times of stirring (or rotation) and the time of stirring (or rotation) required for redispersion of the metal compound particles.
- the fact that the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles are a redispersion facilitating agent for metal compound particles can be confirmed by, for example, a method using a stirring ball, but is not limited thereto.
- a stirring ball is put into a liquid composition containing C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles and metal compound particles, and the liquid composition containing the stirring ball is allowed to stand or is centrifuged, thereby precipitating metal. It produces aggregates of compound particles. After that, the mixture is stirred (or rotated) manually or using a rotator or the like, and the number of times of stirring (or rotation) and the time until the aggregates are redispersed are measured.
- Measurements of liquid compositions containing C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles are measurements of liquid compositions without C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles. It can be confirmed that the value is lower than the value.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles which are redispersion facilitating agents for the metal compound particles of the present invention, can be added to the liquid composition to increase the redispersibility of the metal compound particles in a method using a stirring ball.
- the number of times of stirring (or rotation) required for redispersion can be reduced by 1, 5, 10, 15, 20, 30, 50, 70, 100, 150, or 200 times or more, and the stirring required for redispersion of the metal compound particles (or rotation) can be reduced to 1/2, 1/3, 1/4, 1/5, 1/10 or 1/20, and the metal compound particles contained in the liquid composition can be reduced to only 1, It can be redispersed by agitation (or rotation) no more than 2, 3, 4, 5, 6, 7, 8, 9 or 10 times.
- the C 5-10 alkyltri-C 1-3 alkoxysilane of the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles which is the redispersion facilitating agent for the metal compound particles of the present invention, has 5 to 10 carbon atoms. It is a silane compound having an alkyl group and three alkoxy groups having 1 to 3 carbon atoms and having reactivity with a zinc oxide compound. These silane compounds are silane compounds represented by the following general formula (1).
- RSiX3 (1) (R represents an alkyl group having 5 to 10 carbon atoms (which may be linear or branched), and each X independently represents an alkoxy group having 1 to 3 carbon atoms.)
- the alkyl group represented by R is an alkyl group having 5 to 10 carbon atoms, and includes a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, and a decyl group. It may be a chain or a branched chain.
- Examples of the alkoxy group represented by X in the above general formula (1) include alkoxy groups having 1 to 3 carbon atoms such as methoxy, ethoxy, propoxy and isopropoxy groups.
- silane compounds include, for example, pentyltrimethoxysilane, hexyltrimethoxysilane, heptyltrimethoxysilane, octyltrimethoxysilane, nonyltrimethoxysilane, decyltrimethoxysilane, pentyltriethoxysilane, hexyltriethoxysilane, heptyl triethoxysilane, octyltriethoxysilane, nonyltriethoxysilane, decyltriethoxysilane, pentyltripropoxysilane, hexyltripropoxysilane, heptyltripropoxysilane, octyltripropoxysilane, nonyltripropoxysilane, decyltripropoxysilane, pentyl triisopropoxysilane, hexyltriisopropoxysilane,
- octyltriethoxysilane and octyltrimethoxysilane are particularly preferred.
- the silane compound is characterized in that it can be easily treated uniformly, that it is easy to supply, and that it is inexpensive. Excellent redispersibility of compound particles.
- the silane compound and zinc oxide particles are mixed in an organic solvent such as n-hexane, cyclohexane, or a lower alcohol, and optionally pulverized. is removed by heating or under reduced pressure, and the silane compound is chemically reacted with a reactive group (such as an alkoxy group) on the surface of the zinc oxide particle powder, preferably by heat treatment at 80 to 250°C.
- an organic solvent such as n-hexane, cyclohexane, or a lower alcohol
- optionally pulverized is removed by heating or under reduced pressure, and the silane compound is chemically reacted with a reactive group (such as an alkoxy group) on the surface of the zinc oxide particle powder, preferably by heat treatment at 80 to 250°C.
- JP-A-2007-326902 may be used to coat zinc oxide particle powder with a specific polysiloxane compound, and then surface-treat the silane compound or silazane compound in water.
- the silane compound is applied to the surface of the inorganic oxide-treated zinc oxide particle powder.
- a coating method is also included.
- the method for producing the inorganic oxide-treated zinc oxide particle powder include conventionally known treatment methods such as a wet treatment method using a solvent and a mechanochemical method.
- the method described in WO98/17730 may be used to obtain a silica-coated zinc oxide particle powder by coating the surface of the zinc oxide particle powder with a silicone compound and firing the coated powder.
- the coating amount of the silane compound on the zinc oxide particle powder is preferably 3 to 15% by mass, more preferably 4 to 10% by mass, based on the total amount of the zinc oxide particle powder used. Within this range, the zinc oxide particle powder surface is uniformly coated with the silane compound, and the silane compound does not agglomerate or precipitate on the zinc oxide particle powder surface.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles which are redispersion facilitating agents for metal compound particles of the present invention, have an average particle size of 200 nm or less, 100 nm or less, 50 nm or less, or 40 nm or less. , more preferably 50 nm or less, 40 nm or less, or 35 nm or less.
- the average particle size of the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles, which is a redispersion facilitating agent for the metal compound particles is preferably smaller than the average particle size of the metal compound.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles which are redispersion facilitating agents for the metal compound particles of the present invention, are 0.1% by weight or more and 0.5% by weight of the total liquid composition. % by weight or more, 1.0% by weight or more, 3% by weight or more, 5% by weight or more, 7% by weight or more, or 10% by weight or more, and 30% by weight or less, 25% by weight or less, and 20% by weight or less , or 15% by weight or less, and 0.1 to 30% by weight, 0.5 to 30% by weight, 1 to 30% by weight, 3 to 30% by weight, 5 to 30% by weight of the total liquid composition , 7-30% by weight, 10-30% by weight, 0.1-25% by weight, 0.5-25% by weight, 1-25% by weight, 3-25% by weight, 5-25% by weight, 7-25% by weight % by weight, 10-25% by weight, 0.1-20% by weight, 0.5-20% by weight, 1-20% by weight, 3-20% by weight, 5-20%
- the metal compound particles to which the redispersion facilitating agent of the present invention is applied are not particularly limited, but examples include zinc oxide particles, magnesium titanate particles, calcium cerium phosphate particles, titanium mica particles, barium sulfate particles, Titanium particles, cerium oxide particles, zirconium oxide particles, iron oxide particles and the like can be mentioned, and these can be used singly or in combination of two or more.
- the average particle diameter (before aggregation) of the metal compound particles to which the redispersion facilitating agent of the present invention is applied is, for example, 0.1 ⁇ m or more, 0.5 ⁇ m or more, 1 ⁇ m or more, 2 ⁇ m or more, or 3 ⁇ m or more, and 300 ⁇ m or more.
- the average particle size ranges from 0.1 to 200 ⁇ m, 0.1 to 150 ⁇ m, 0.1-100 ⁇ m, 0.1-50 ⁇ m, 0.1-20 ⁇ m, 0.1-10 ⁇ m, 2-200 ⁇ m, 2-150 ⁇ m, 2-100 ⁇ m, 2-50 ⁇ m, 2-20 ⁇ m, 2-10 ⁇ m, 3- 200 ⁇ m, 3-150 ⁇ m, 3-100 ⁇ m, 3-50 ⁇ m, 3-20 ⁇ m or 3-10 ⁇ m.
- the average particle size of the metal compound particles to which the redispersion facilitating agent of the present invention is applied is preferably larger than the average particle size of the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles. , 10 times or more, 20 times or more, 30 times or more, 40 times or more, 50 times or more, 80 times or more, 100 times or more the average particle size of the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles, 150 times or more, or 200 times or more. Within this range, redispersibility characteristics are excellent when the metal compound particles are aggregated and precipitated.
- the metal compound particles to which the redispersion facilitating agent in the present invention is applied have a specific gravity of 3 or more, 3.5 or more, 4 or more, 4.5 or more, or 5 or more, and 20 or less, 15 or less, or 10 or less. , 9 or less, 8 or less, or 7 or less, for example, 3 to 20, 3 to 15, 3 to 10, 3 to 9, 3 to 8, 3 to 7, 4 to 20, 4 to 15, 4 to 10, Specific gravity in the range of 4-9, 4-8, 4-7, 5-20, 5-15, 5-10, 5-9, 5-8 or 5-7.
- the shape of the metal compound particles to which the redispersion facilitating agent of the present invention is applied is not particularly limited, and may be spherical, needle-like, plate-like, or the like.
- the "average particle size" in the present invention is, for example, a value determined by measurement with an image analyzer (Luzex IIIU, manufactured by Nireco) when the particles are not spherical, and is determined as a number-average circular area equivalent diameter. be able to.
- the metal compound particles to which the redispersion facilitating agent in the present invention is applied may be surface-treated.
- Surface treatments include, for example, silane compound treatment (octyltriethoxylan, etc.), silicone compound treatment, fluorine-modified silicone compound treatment, fluorine compound treatment, higher fatty acid treatment (stearic acid, etc.), higher alcohol treatment, fatty acid ester treatment, metallic soap. treatment, amino acid treatment, alkyl phosphate treatment and the like.
- the metal compound particles to which the redispersion facilitating agent in the present invention is applied may be phosphors.
- Phosphors include zinc oxide phosphors, magnesium titanate phosphors, calcium cerium phosphate phosphors, and the like, and the liquid composition of the present invention may contain one or more of these phosphors.
- a phosphor made of metal compound particles can be synthesized, for example, by the method described in JP-A-2019-167330.
- the metal compound particles to which the redispersion facilitating agent of the present invention is applied precipitate and form aggregates due to storage or standing.
- Zinc oxide particles improve redispersibility.
- the reason why the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles, which are the redispersion facilitating agents of the present invention, exhibit excellent effects is not clear, they precipitate together with the metal compound particles and may prevent aggregation of the metal compound particles.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles, which are redispersion facilitating agents form a structure to increase the static viscosity of the entire liquid composition, and cause aggregation of the metal compound particles.
- the C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles which are redispersion facilitating agents, enhance redispersibility regardless of the type of the metal compound of the present invention, and are therefore versatile. be.
- C 5-10 alkyltri-C 1-3 alkoxysilane treated zinc oxide as a redispersion facilitating agent for metal compound particles for redispersion of said metal compound particles that settle in the composition
- particles By adding C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles to the liquid composition, the number of metal compound particles contained in the liquid composition can be reduced to only 1, 2, 3, 4, 5. , 6, 7, 8, 9 or 10 times of agitation (or rotation).
- One aspect of the present invention is the use of C 5-10 alkyltri-C 1-3 alkoxysilane treated zinc oxide particles as a redispersion facilitating agent for metal compound particles.
- C 5-10 alkyltri-C 1-3 alkoxysilane-treated zinc oxide particles can be added as a component of the liquid composition to facilitate redispersion of metal compound particles that precipitate and agglomerate in the liquid composition. .
- Example 1 Effect of octyltriethoxysilane-treated zinc oxide 1-1) Redispersibility test using a stirring ball Transfer 35 mL of the liquid composition to be tested to a centrifuge bottle (manufactured by Corning, 50 mL polypropylene Falcon conical tube), and add one stirring ball (made of steel, diameter 5.56 mm). and centrifuged at 740 rpm (110 xg) for 60 minutes at room temperature to precipitate and aggregate the metal compound particles, thereby reproducing the state when the liquid composition was stored for a certain period of time (centrifuge: manufactured by Himac, CF7D2). After that, the centrifugal bottle was shaken up and down by hand, and the number of times of stirring was counted when the sound of the stirring ball began to be heard, and the redispersibility was evaluated.
- a stirring ball transfer 35 mL of the liquid composition to be tested to a centrifuge bottle (manufactured by Corning, 50 mL polypropylene Falcon con
- the zinc oxide phosphor contained in the liquid composition may precipitate during storage and form aggregates.
- the effects of the following six compounds known as UV scattering agents in the liquid composition on the redispersibility of the zinc oxide phosphor were examined by the above "1-1) Redispersibility test using a stirring ball.” rice field.
- the component composition of the tested liquid composition is as shown in Table 1, and was produced according to a normal production method.
- the octyltriethoxysilane-treated zinc oxide particles significantly improved the redispersibility of the zinc oxide phosphor compared to other UV scattering agents.
- the redispersibility of octyltriethoxysilane-treated zinc oxide particles having a particle size of 25 and 35 nm was similarly improved in contrast to the zinc oxide phosphor having a particle size (average particle size) of 3 ⁇ m.
- viscometer TVB-15 manufactured by TOKI SANGYO viscometer TVB-15 manufactured by TOKI SANGYO
- the octyltriethoxysilane-treated zinc oxide particles form a structure and increase the static viscosity of the entire liquid composition, thereby suppressing the precipitation and aggregation of the zinc oxide phosphor, which is a metal compound. gender was suggested.
- Example 2 Effect on Various Metal Compound Particles
- octyltriethoxysilane-treated zinc oxide on the redispersibility of the following four types of metal compound particles other than the zinc oxide phosphor was evaluated as described in "1-1) Stir ball. redispersibility test using ".
- the component composition of the tested liquid composition is as shown in Table 2, and was produced according to the usual production method: 1) Formulation Examples 7 and 8: stearic acid-treated zinc oxide phosphor (specific gravity 5.6, particle size 3 ⁇ m) 2) Formulation Examples 9 and 10: Magnesium titanate phosphor (specific gravity 4.5, particle size 3 to 4 ⁇ m) 3) Formulation Examples 11 and 12: Barium sulfate (specific gravity 4.4, particle size 10 to 20 ⁇ m) 4) Formulation Examples 13 and 14: Titanium mica (specific gravity 3.1, particle size 22-74 ⁇ m)
- the octyltriethoxysilane-treated zinc oxide improved the redispersibility of the stearic acid-treated zinc oxide phosphor. Therefore, it was found that the effect of octyltriethoxysilane-treated zinc oxide was observed even when the metal compound particles were surface-treated. Similarly, it was found that octyltriethoxysilane-treated zinc oxide improves the redispersibility of magnesium titanate, barium sulfate, and titanium mica, and is effective regardless of the type of metal compound particles.
- the octyltriethoxysilane-treated zinc oxide increased the viscosity of the liquid composition, but the viscosity was comparable to Formulation Examples 3 to 6, which had poor redispersibility. Since it is believed that the octyltriethoxysilane-treated zinc oxide settles together with the metal compound particles, the octyltriethoxysilane-treated zinc oxide forms a structure to increase the static viscosity of the entire liquid composition, and the metal compound particles It was suggested that the redispersibility may be improved by directly acting such as suppressing aggregation by surrounding the
- the liquid composition containing octyltriethoxysilane-treated zinc oxide particles and metal compound particles has excellent redispersibility of the metal compound particles, and the octyltriethoxysilane-treated zinc oxide particles have excellent redispersibility of the metal compound particles. It was found to be useful as a redispersion facilitating agent for metal compound particles.
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Abstract
Description
(1)(A)平均粒子径100nm以下のC5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子、及び
(B)0.2重量%以上の濃度で、比重3以上で、かつ平均粒子径1μm以上の金属化合物粒子、
を含む、液状組成物。
(2)前記C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子の濃度が1重量%以上である、(1)に記載の液状組成物。
(3)液状組成物の粘度が10000mPa・s以下である、(1)又は(2)に記載の液状組成物。
(4)前記金属化合物粒子が、硫酸バリウム、雲母チタン、酸化亜鉛、酸化亜鉛蛍光体、チタン酸マグネシウム、チタン酸マグネシウム蛍光体、リン酸カルシウム、リン酸カルシウムセリウム蛍光体及びオキシ塩化ビスマスからなる群から選ばれる1又は複数種の粉末である、(1)~(3)のいずれかに記載の液状組成物。
(5)前記C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子がオクチルトリエトキシシラン処理酸化亜鉛粒子又はオクチルトリメトキシシラン処理酸化亜鉛粒子である、(1)~(4)のいずれかに記載の液状組成物。
(6)沈殿する前記金属化合物粒子が再分散性である、(1)~(5)のいずれかに記載の液状組成物。
(7)油中水型組成物である、(1)~(6)のいずれかに記載の液状組成物。
(8)日焼け止め化粧料である、(1)~(7)のいずれかに記載の液状組成物。
(9)C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子を有効成分として含む、液状組成物中で沈殿及び凝集する金属化合物粒子の再分散容易化剤。
(10)前記金属化合物粒子が、比重3以上で、かつ平均粒子径1μm以上の粉末である、(9)に記載の再分散容易化剤。
(11)前記金属化合物粒子が、硫酸バリウム、雲母チタン、酸化亜鉛、酸化亜鉛蛍光体、チタン酸マグネシウム、チタン酸マグネシウム蛍光体、リン酸カルシウム、リン酸カルシウムセリウム蛍光体及びオキシ塩化ビスマスからなる群から選ばれる1又は複数種の粉末である、(9)又は(10)に記載の再分散容易化剤。
(12)前記C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子がオクチルトリエトキシシラン処理酸化亜鉛粒子又はオクチルトリメトキシシラン処理酸化亜鉛粒子である、(9)~(11)のいずれかに記載の再分散容易化剤。
(13)液状組成物中で沈殿、凝集する金属化合物粒子の再分散のための、(9)~(12)のいずれかに記載の再分散容易化剤の使用。
本発明で用いるC5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子のC5-10アルキルトリC1-3アルコキシシランは炭素数5~10のアルキル基を有し、かつ3つの炭素数1~3のアルコキシ基を有し酸化亜鉛化合物と反応性を有するシラン化合物である。これらのシラン化合物は下記一般式(1)で示されるシラン化合物である。
(Rは炭素数5~10のアルキル基(直鎖であっても分岐鎖であっても構わない)を示し、Xはそれぞれ独立して、炭素数1~3のアルコキシ基を示す。)
本発明の「金属化合物粒子」とは、金属原子を含む、有機又は無機化合物であって、粒子状のものを意味する。本発明における金属化合物粒子としては、特に限定されるものではないが、例えば酸化亜鉛粒子、チタン酸マグネシウム粒子、リン酸カルシウムセリウム粒子、雲母チタン粒子、硫酸バリウム粒子、酸化チタン粒子、酸化セリウム粒子、酸化ジルコニウム粒子、酸化鉄粒子及びオキシ塩化ビスマス粒子等が挙げられ、これらを一種又は二種以上併用して用いることができる。
本発明の液状組成物は,分散剤を含有してもよい。分散剤とは、水相又は油相中に分散された粒子(粉体)の表面に吸着することで、水性又は油性媒体中に均一に分散せしめることのできる物質を指す。本発明の液状組成物に含まれる好ましい分散剤としては、PEG-10ジメチコン、ビスブチルジメチコンポリグリセリル-3、PEG-ポリジメチルポリシロキサンエチルジメチコン、ラウリルPEG-ポリジメチルポリシロキサンエチルジメチコン、セチルPEG/PPG-10/ジメチコン、イソステアリン酸、ジイソステアリン酸ポリグリセリル-2、カルボキシデシルトリシロキサン、PEG-12ジメチコン、もしくはモノステアリン酸ポリオキシエチレンソルビタン又はこれらの2以上の組み合わせを含む。
本発明の液状組成物は,油分を含有してもよい。油分とは、本発明の液状組成物の成分である、水と相分離する疎水性の物質を指す。本発明で使用し得る油分は、特に限定されず、例えば、炭化水素油、エステル油、シリコーン油、液体油脂、固体油脂及び高級アルコールの少なくとも一種以上を含む。
本発明の液状組成物は、本発明の効果に影響を及ぼさない範囲で、各種成分を適宜配合することができる。各種成分としては、化粧料に通常配合し得るような添加成分、例えば、粘土鉱物(ジメチルジステアリルアアンモニウムヘクトライト等)、金属化合物粒子以外の粉末(ポリメタクリル酸メチル、架橋型シリコーン・網状型シリコーンブロック共重合体、シリカ、疎水化タルク(ジメチコン処理タルク等)、トウモロコシデンプン、疎水化処理ポリウレタン等)、被膜剤(トリメチルシロキケイ酸、ジメチコン等)、経皮吸収抑制剤(ポリプロピレングリコール(17)等)、油相増粘剤(ジメチルジステアリルアンモニウムヘクトライト、パルミチン酸デキストリン、トリ酢酸テトラステアリン酸スクロース等)、紫外線吸収剤(オクトクリレン、ポリシリコーン―15、ビスエチルヘキシルオキシフェノールメトキシフェニルトリアジン、ジエチルアミノヒドロキシベンゾイル安息香酸ヘキシル、サリチル酸エチルヘキシル等)、C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子以外の紫外線散乱剤(ステアリン酸/水酸化Al処理酸化チタン、ハイドロゲンジメチコン/水酸化Al処理酸化チタン、シリカ/ジメチコン/ハイドロゲンジメチコン処理酸化チタン、ジメチコン処理酸化亜鉛、シリカ/ジメチコン処理酸化亜鉛、パルミチン酸デキストリン処理酸化亜鉛、ハイドロゲンジメチコン処理酸化亜鉛等)、キレート剤(エデト酸ナトリウム水和物等)、香料、保湿剤(グリセリン等)、防腐剤、アニオン性界面活性剤、カチオン性界面活性剤、両性界面活性剤、非イオン性界面活性剤、水溶性高分子、シリコーン化多糖類等の皮膜形成剤、金属イオン封鎖剤、低級アルコール(エチルアルコール等)、多価アルコール、各種抽出液、糖、アミノ酸、有機アミン、高分子エマルジョン、pH調整剤、皮膚栄養剤、ビタミンB2以外のビタミン、医薬品、医薬部外品、化粧品等に適用可能な水溶性薬剤、酸化防止剤、緩衝剤、噴射剤、有機系粉末、顔料、染料、色素、水、酸成分、アルカリ成分等をあげることができる。これらの任意成分は、油相中及び水相中に適宜配合することができる。
具体的には、以下の手順により本実施形態における液状組成物が得られる。すなわち、油性成分を混合して油相を調製し、水溶性成分を混合して水相を調製する。C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子の粉末、金属化合物粒子の粉末は水相または油相に分散させることができるが、同一相に分散させることが好ましい。前記水相を油相に添加し、撹拌することにより、油中水型組成物を得る。
本発明の一態様としては、金属化合物粒子の再分散容易化剤としてのC5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子がある。本発明において「再分散容易化剤」とは、液状組成物中で沈殿し、凝集した金属化合物粒子の再分散性を向上させ、該金属化合物粒子の再分散を容易化するための化合物を意味する。C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子が液状組成物中で金属化合物粒子の再分散剤として機能することは、例えば以下の実施例に記載の攪拌球を用いる方法等に従って、金属化合物粒子の再分散に要する攪拌(又は回転)回数や攪拌(又は回転)時間を低下させることにより確認することができる。
(Rは炭素数5~10のアルキル基(直鎖であっても分岐鎖であっても構わない)を示し、Xはそれぞれ独立して、炭素数1~3のアルコキシ基を示す。)
1-1)攪拌球を用いた再分散性試験
試験対象の液状組成物35mLを遠心ボトル(コーニング社製、50mLポリプロピレンファルコンコニカルチューブ)に移し、攪拌球(スチール製、直径5.56mm)1個を入れ、740rpm(110xg)で60分間、室温にて遠心し、金属化合物粒子を沈殿・凝集させることにより、液状組成物を一定期間保管した時の状態を再現した(遠心機:himac社製、CF7D2)。その後、遠心ボトルを手で上下に振って、攪拌球の音が鳴り始めた時の攪拌回数をカウントし再分散性を評価した。
液状組成物に含まれる酸化亜鉛蛍光体は、保存により沈殿し、凝集体を形成することがある。その液状組成物に紫外線散乱剤として知られている以下の6種類の化合物の酸化亜鉛蛍光体の再分散性に与える効果を前記「1-1)攪拌球を用いた再分散性試験」により調べた。試験した液状組成物の成分組成は表1に記載の通りであり、通常の製造方法に従って製造した。なお、酸化亜鉛蛍光体はLumateG(比重5.6,粒子径3μm)(堺化学工業)をオクチルトリエトキシシラン処理して使用した:
1)処方例1:オクチルトリエトキシシラン処理酸化亜鉛 (粒子径25nm)
2)処方例2:オクチルトリエトキシシラン処理酸化亜鉛 (粒子径35nm)
3)処方例3:ジメチコン処理酸化亜鉛 (粒子径25nm)
4)処方例4:シリカ/ジメチコン処理酸化亜鉛 (粒子径20nm)
5)処方例5:パルミチン酸デキストリン処理酸化亜鉛 (粒子径25nm)
6)処方例6:ハイドロゲンジメチコン処理酸化亜鉛 (粒子径50nm)
次に、酸化亜鉛蛍光体以外の以下の4種類の金属化合物粒子の再分散性に対するオクチルトリエトキシシラン処理酸化亜鉛の効果を前記「1-1)攪拌球を用いた再分散性試験」により調べた。試験した液状組成物の成分組成は表2に記載の通りであり、通常の製造方法に従って製造した:
1)処方例7,8:ステアリン酸処理酸化亜鉛蛍光体(比重5.6、粒子径3μm)
2)処方例9,10:チタン酸マグネシウム蛍光体(比重4.5、粒子径3~4μm)
3)処方例11,12:硫酸バリウム(比重4.4、粒子径10~20μm)
4)処方例13,14:雲母チタン(比重3.1、粒子径22~74μm)
Claims (13)
- (A)平均粒子径100nm以下のC5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子、及び
(B)0.2重量%以上の濃度で、比重3以上で、かつ平均粒子径1μm以上の金属化合物粒子、
を含む、液状組成物。 - 前記C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子の濃度が1重量%以上である、請求項1に記載の液状組成物。
- 液状組成物の粘度が10000mPa・s以下である、請求項1又は2に記載の液状組成物。
- 前記金属化合物粒子が、硫酸バリウム、雲母チタン、酸化亜鉛、酸化亜鉛蛍光体、チタン酸マグネシウム、チタン酸マグネシウム蛍光体、リン酸カルシウム、リン酸カルシウムセリウム蛍光体及びオキシ塩化ビスマスからなる群から選ばれる1又は複数種の粉末である、請求項1~3のいずれか1項に記載の液状組成物。
- 前記C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子がオクチルトリエトキシシラン処理酸化亜鉛粒子又はオクチルトリメトキシシラン処理酸化亜鉛粒子である、請求項1~4のいずれか1項に記載の液状組成物。
- 沈殿する前記金属化合物粒子が再分散性である、請求項1~5のいずれか1項に記載の液状組成物。
- 油中水型組成物である、請求項1~6のいずれか1項に記載の液状組成物。
- 日焼け止め化粧料である、請求項1~7のいずれか1項に記載の液状組成物。
- C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子を有効成分として含む、液状組成物中で沈殿及び凝集する金属化合物粒子の再分散容易化剤。
- 前記金属化合物粒子が、比重3以上で、かつ平均粒子径1μm以上の粉末である、請求項9に記載の再分散容易化剤。
- 前記金属化合物粒子が、硫酸バリウム、雲母チタン、酸化亜鉛、酸化亜鉛蛍光体、チタン酸マグネシウム、チタン酸マグネシウム蛍光体、リン酸カルシウム、リン酸カルシウムセリウム蛍光体及びオキシ塩化ビスマスからなる群から選ばれる1又は複数種の粉末である、請求項9又は10に記載の再分散容易化剤。
- 前記C5-10アルキルトリC1-3アルコキシシラン処理酸化亜鉛粒子がオクチルトリエトキシシラン処理酸化亜鉛粒子又はオクチルトリメトキシシラン処理酸化亜鉛粒子である、請求項9~11のいずれか1項に記載の再分散容易化剤。
- 液状組成物中で沈殿、凝集する金属化合物粒子の再分散のための、請求項9~12のいずれか1項に記載の再分散容易化剤の使用。
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| JP2012111726A (ja) * | 2010-11-26 | 2012-06-14 | Shiseido Co Ltd | 日焼け止め水中油型乳化化粧料 |
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| WO2024177089A1 (ja) * | 2023-02-21 | 2024-08-29 | 花王株式会社 | 油中水型乳化化粧料 |
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