WO2024048324A1 - 粉末分散組成物、及び化粧料 - Google Patents
粉末分散組成物、及び化粧料 Download PDFInfo
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- WO2024048324A1 WO2024048324A1 PCT/JP2023/029826 JP2023029826W WO2024048324A1 WO 2024048324 A1 WO2024048324 A1 WO 2024048324A1 JP 2023029826 W JP2023029826 W JP 2023029826W WO 2024048324 A1 WO2024048324 A1 WO 2024048324A1
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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
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/04—Dispersions; Emulsions
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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
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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
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
- A61K8/36—Carboxylic acids; Salts or anhydrides thereof
- A61K8/365—Hydroxycarboxylic acids; Ketocarboxylic acids
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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
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
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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
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
- A61K8/89—Polysiloxanes
- A61K8/891—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
- A61K8/893—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone modified by an alkoxy or aryloxy group, e.g. behenoxy dimethicone or stearoxy dimethicone
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- 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
Definitions
- the present invention relates to powder dispersion compositions and cosmetics.
- a composition containing both oil and water phases contains a metal oxide powder whose surface has been made hydrophobic as an ultraviolet scattering agent or the like.
- Such hydrophobized metal oxide powder usually exists in large amounts in the oil phase.
- the use of specific silicones or the like as a dispersant has been considered (for example, Patent Documents 1 and 2).
- one embodiment of the present invention provides a powder dispersion composition
- a powder dispersion composition comprising (a) a hydrophobized metal oxide powder, and (b) a polyether-modified silicone having an HLB of 5 or more and 17 or less.
- a hydroxycarboxylic acid salt having 2 to 10 carbon atoms
- the ratio of the content of the component (d) to the content of the component (a) is 1.2 ⁇ 10 ⁇ 4 or more and 2.3 ⁇ 10 ⁇ 3 or less
- the component ( The ratio of the content of c) to the content of component (a) is 1.2 ⁇ 10 ⁇ 3 or more and 2.3 ⁇ 10 ⁇ 2 or less.
- a powder dispersion composition exhibiting a good powder dispersion state can be provided.
- the powder dispersion composition according to this embodiment is a composition in which powder is dispersed.
- Such powder dispersion compositions include those in which the powder remains dispersed over normal storage periods, and further include those in which the powder settles during storage periods normal in the art; It also includes methods in which redispersion is possible by stirring the composition or shaking the container.
- the powder dispersion composition according to this embodiment may be an aqueous dispersion composition in which powder is dispersed in an aqueous medium (aqueous dispersion).
- the powder dispersion composition can be used directly or mixed with other components, for example, can be mixed with an oil component to prepare a composition containing both an oil phase and an aqueous phase.
- a product obtained by adding other ingredients to the powder dispersion composition according to this embodiment is preferably a product for skin application such as a cosmetic.
- a good dispersion state of the hydrophobized metal oxide powder can be obtained.
- a good dispersion state is a state in which agglomeration of powder particles is suppressed and the powder particles are dispersed with a relatively small agglomerated particle diameter (dispersibility or initial dispersibility), at least immediately after preparation. ).
- a good dispersion condition requires that the powder is prevented from caking once deposited during storage of the composition (caking resistance, i.e., the powder can be redispersed under normal conditions of use); It also includes the ability to uniformly disperse the powder with a relatively small agglomerated particle size (dispersion stability) when the powder once deposited is redispersed.
- the viscosity of the powder dispersion composition according to this embodiment may be 5 mPa ⁇ s or more and 10,000 mPa ⁇ s or less. With a viscosity in this range, the powder dispersion composition exhibits good initial dispersibility. Note that powder dispersion compositions with relatively low viscosity that exhibit good initial dispersibility may have poor caking resistance and dispersion stability, but the composition according to this embodiment has good initial dispersibility. In addition, the caking resistance and dispersion stability are also good.
- Component (a) contained in the powder dispersion composition is a metal oxide powder that has been subjected to a hydrophobization treatment.
- the hydrophobized metal oxide powder is preferably a powder having an ultraviolet scattering function, that is, an ultraviolet scattering agent.
- an ultraviolet scattering agent the average particle diameter of its primary particles is 10 nm or more and 100 nm or less.
- specific examples of hydrophobized metal oxides include titanium oxide, zinc oxide, cerium oxide, talc, silica, mica, sericite, kaolin, titanium mica, black iron oxide, yellow iron oxide, Examples include red iron, ultramarine, navy blue, chromium oxide, and chromium hydroxide.
- titanium oxide and zinc oxide are preferred because they have a high ultraviolet scattering function.
- a composite powder in which particles made of a material other than titanium oxide are coated with titanium oxide can also be used.
- hydrophobized metal oxide powders may be used alone or in combination of two or more.
- the hydrophobization treatment applied to the metal oxide powder may be a treatment of introducing a hydrophobic group or forming a coating of a hydrophobic substance on the surface of the metal oxide particles.
- the hydrophobic treatment may be a wet method using a solvent, a gas phase method, a mechanochemical method, or the like.
- silicones such as methylhydrogenpolysiloxane, dimethylpolysiloxane, triethoxycaprylylsilane, dextrin fatty acid esters, higher fatty acids, higher alcohols, fatty acid esters, metal soaps, alkyl phosphate ethers, Fluorine compounds or hydrocarbons such as squalane and paraffin can be used.
- the content of component (a) hydrophobized metal oxide powder is preferably 5% by mass or more and 40% by mass or less, more preferably 10% by mass or more and 30% by mass or less, based on the total amount of the powder dispersion composition. It may be.
- the function of the metal oxide powder for example, can be improved in the powder dispersion composition or the cosmetic prepared using the powder dispersion composition.
- the content of the ultraviolet scattering agent may be preferably 5% by mass or more and 40% by mass or less, more preferably 10% by mass or more and 30% by mass or less, based on the total amount of the powder dispersion composition.
- Component (b) has a function as a dispersant (or surfactant) and can improve the dispersion state of the hydrophobized powder.
- polyether-modified silicones having an HLB of 5 or more and 17 or less are preferred because they have a high function as a dispersant and can particularly contribute to improving dispersion stability.
- Polyether-modified silicone is a silicone in which a polyether side chain is introduced into the silicone main chain.
- the above polyether-modified silicone has an HLB of 5 or more and 17 or less, it is possible to improve the dispersion state of the hydrophobized powder in the composition. Furthermore, since the HLB is preferably 5 or more and 16 or less, more preferably 6 or more and 10 or less, the initial dispersibility, caking resistance, and dispersion stability of the hydrophobized powder in the composition can be improved. .
- component (b) is a polyether-modified silicone
- it is preferably a dimethicone having a PEG chain and/or a PPG chain, and more preferably a dimethicone having a PEG chain.
- the average number of moles of alkylene oxide added may be 8 or more and 40 or less.
- It may also be an alkyl ether of dimethicone having a terminal of a PEG chain and/or a PPG chain.
- PEG-12 dimethicone and the like are preferred.
- the silicone chain of the polyether-modified silicone having an HLB of 5 or more and 17 or less may be linear or branched, but is preferably linear.
- it may be a polyether-modified alkyl-modified silicone that further has an alkyl side chain, it is preferably unmodified with alkyl.
- polyether-modified silicones may be used alone or in combination of two or more.
- the content of component (b) may be preferably 0.1% by mass or more and 15% by mass or less, more preferably 1% by mass or more and 10% by mass or less, based on the total amount of the powder dispersion composition.
- the component (c) hydroxycarboxylic acid salt can be said to be a dispersion stabilizer that can prevent gelation of the solute and improve the dispersion state, particularly the dispersion stability.
- the number of carboxyl groups contained in the hydroxycarboxylic acid salt used in this embodiment may be 1 or more, preferably 1 to 4. Further, it may be a salt of an aliphatic carboxylic acid or a derivative thereof, or a salt of an aromatic carboxylic acid or a derivative thereof, but a salt of an aliphatic hydroxycarboxylic acid is preferable.
- a specific example of a suitable hydroxycarboxylate is citrate.
- hydroxycarboxylic acid salts may be used alone or in combination of two or more.
- the content of component (c) hydroxycarboxylate is preferably 0.03% by mass or more and 0.4% by mass or less, more preferably 0.05% by mass or more and 0.3% by mass, based on the total amount of the powder dispersion composition. It may be less than % by mass.
- the dispersion state of the hydrophobized powder can be improved.
- dispersion stability can be particularly improved, and by setting the content of component (c) to 0.4% by mass or less, initial dispersibility, caking resistance, and Dispersion stability can be improved.
- the value of the ratio of the content of component (c) hydroxycarboxylate to the content of component (a) hydrophobized metal oxide powder ([content of component (c)]/[component (a) ) is preferably 1.2 ⁇ 10 ⁇ 3 or more and 2.3 ⁇ 10 ⁇ 2 or less, more preferably 1.5 ⁇ 10 ⁇ 3 or more and 2 ⁇ 10 ⁇ 2 or less.
- the dispersion state of the hydrophobized powder can be improved.
- dispersion stability can be particularly improved, and by setting it to 2.3 ⁇ 10 -2 or less, initial dispersibility, caking resistance, and Dispersion stability can be improved.
- the component (d) acrylic polymer is added as an anti-caking agent.
- the component (d) is a polymer containing a structural unit derived from (meth)acrylic acid and/or a structural unit derived from a (meth)acrylic acid alkyl ester.
- the polymer may be a homopolymer, a copolymer, or a crosspolymer.
- the component (d) acrylic polymer may be a salt neutralized with a basic substance. In this embodiment, by blending the component (d) in a predetermined amount, it is possible to improve the dispersion state of the hydrophobized powder.
- Component (d) polymer more specifically comprises a structural unit derived from unsubstituted or substituted (meth)acrylic acid, and/or a structural unit derived from unsubstituted or substituted (meth)acrylic acid alkyl ester.
- component (d) include carboxyvinyl polymer (carbomer), polyacrylic acid, sodium polyacrylate, acrylates/alkyl acrylate (C10-30) crosspolymer), (acrylates/steareth methacrylate-20) copolymer , (acrylates/steareth methacrylate-20) crosspolymer, (acrylates/steareth itaconate-20) copolymer, (acrylates/beheneth methacrylate-25) copolymer, (acrylates/hydroxyalkyl acrylate) copolymer, (acrylates/neodecanoic acid) (vinyl) crosspolymer, (methacryloyloxyethylcarboxybetaine/alkyl methacrylate) copolymer, and the like.
- carboxyvinyl polymer (carbomer), polyacrylic acid, sodium polyacrylate, acrylates/alkyl acrylate (C10-30) crosspolymer), (acrylates/steareth methacrylate-20
- carboxyvinyl polymer (carbomer), sodium polyacrylate, acrylates/alkyl acrylate (C10-30) crosspolymer) are preferred because they have a high effect of improving the dispersion state, and carboxyvinyl polymer (carbomer) is particularly preferred. preferable.
- the above polymers may be used alone or in combination of two or more.
- the content of the component (d) acrylic polymer is preferably 0.003% by mass or more and 0.04% by mass or less, more preferably 0.004% by mass or more and 0.03% by mass, based on the total amount of the powder dispersion composition. % or less.
- the value of the ratio of the content of component (d) acrylic polymer to the content of component (a) hydrophobized metal oxide powder is preferably 1.2 ⁇ 10 ⁇ 4 or more and 2.3 ⁇ 10 ⁇ 3 or less, more preferably 1.5 ⁇ 10 ⁇ 4 or more and 1.5 ⁇ 10 ⁇ 3 or less, and even more preferably 2 It may be greater than or equal to ⁇ 10 ⁇ 4 and less than or equal to 2 ⁇ 10 ⁇ 3 .
- dispersion stability can be particularly improved, and by setting it to 2.3 ⁇ 10 -3 or less, initial dispersibility, caking resistance, and Dispersion stability can be improved.
- the ratio of the content of component (c) hydroxycarboxylate to the content of component (d) acrylic polymer is , preferably 4 or more and 40 or less, more preferably 5 or more and 35 or less.By setting the value of the ratio within the above range, the dispersion state of the hydrophobized powder can be improved.In particular, the value of the above ratio By setting the ratio to 4 or more, initial dispersibility can be improved, and by setting the value of the above ratio to 40 or less, caking resistance can be improved.
- the powder dispersion composition according to this embodiment is an aqueous dispersion composition as described above, and may contain an aqueous component.
- the water-based component is not particularly limited as long as it is a water-based component commonly used in external compositions such as cosmetics and quasi-drugs.
- Water-based components include water, and further include water-soluble alcohol, thickeners, humectants, chelating agents, preservatives, antioxidants, pigments, etc., to the extent that they do not interfere with the effects of the present invention. Good too.
- the content of the aqueous component in the powder dispersion composition may be preferably 45% by mass or more and 95% by mass or less, more preferably 50% by mass or more and 90% by mass or less, based on the total amount of the powder composition.
- purified water As water, purified water, ion exchange water, tap water, etc. can be used.
- the content of water in this embodiment may be preferably 20% by mass or more and 70% by mass or less, more preferably 30% by mass or more and 60% by mass or less, based on the total amount of the powder dispersion composition.
- water-soluble alcohols include lower alcohols, polyhydric alcohols, polyhydric alcohol polymers, alcohol alkyl ethers, alcohol ether esters, glycerin monoalkyl ethers, sugar alcohols, monosaccharides, oligosaccharides, polysaccharides, and derivatives thereof. Can be mentioned.
- Examples of lower alcohols include ethanol, propanol, isopropanol, isobutyl alcohol, t-butyl alcohol, and the like.
- Examples of polyhydric alcohols include dihydric alcohols (for example, dipropylene glycol, 1,3-butylene glycol, ethylene glycol, trimethylene glycol, 1,2-butylene glycol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, octylene glycol, etc.), trihydric alcohols (eg, glycerin, trimethylolpropane, etc.), and the like.
- dihydric alcohols for example, dipropylene glycol, 1,3-butylene glycol, ethylene glycol, trimethylene glycol, 1,2-butylene glycol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene
- the above-mentioned powder that has not been subjected to hydrophobization treatment may be added, for example, as a pigment.
- the above-mentioned powder dispersion composition is suitably used for the preparation of cosmetics. That is, one form of the present invention may be a cosmetic comprising the above-mentioned powder dispersion composition.
- Cosmetics can be obtained as a composition containing both an oil phase and an aqueous phase, for example, by adding an oil-based component to the above-mentioned powder dispersion composition.
- the above-mentioned powder dispersion composition is preferably used for preparing a water-in-oil emulsion composition or an oil-in-water emulsion composition, particularly in the preparation of a water-in-oil emulsion composition in which it is difficult to increase the content of the hydrophobized powder.
- Cosmetics in this specification include cosmetics with enhanced ultraviolet absorption function, basic cosmetics (foundation, base makeup, etc.), and makeup cosmetics (eye shadow, cheek, etc.), as well as sunscreen compositions. (Sunscreen composition).
- the powder dispersion composition according to the present embodiment has a relatively high content of hydrophobized metal oxide powder and is uniformly dispersed therein, making it easy to operate in the preparation of cosmetics. Furthermore, in the resulting cosmetic, it is easy to obtain a relatively high content of the hydrophobized metal oxide powder and a uniformly dispersed state, and the function of the metal oxide powder can be improved.
- Powder compositions of Examples and Comparative Examples were prepared and evaluated by mixing the components shown in Tables 1 to 3 in a conventional manner.
- ⁇ Dispersibility evaluation> A powder dispersion composition (original sample) immediately after preparation for each example, and a sample obtained by diluting the original sample 10,000 times with pure water (diluted sample) were prepared. Dispersibility was then evaluated by visually observing the appearance of the original sample and by measuring dynamic light scattering (DLS) of the diluted sample.
- DLS dynamic light scattering
- DLS-8000 manufactured by Otsuka Electronics, Ar ion laser (488 nm)
- the cumulant particle size at a scattering angle of 90° was used as the particle size (Dp1) for evaluation.
- the evaluation was based on the following indicators: A: The original sample is uniform, and the particle size (Dp1) of the powder in the diluted sample is 150 nm or less. B: The original sample is uniform, and the particle size (Dp1) of the powder in the diluted sample is more than 151 nm and 250 nm or less. C: Slight agglomerates were visually confirmed in the original sample, or the original sample was homogeneous, but the particle size (Dp1) in the diluted sample was more than 251 nm D: Powder was clearly separated and aggregated in the original sample was
- Caking resistance was evaluated for the powder dispersion compositions that had the above-mentioned dispersibility evaluation of "A" or "B".
- 50 g of the powder dispersion composition of each example was filled into a 50 mL glass screw tube and stored at room temperature for one month. After one month of storage, the settling of the powder at the bottom of the glass screw tube container was determined by visual inspection, and for compositions in which settling was confirmed, the state was examined after stirring with a medicine spoon for a specified period of time. Observed.
- the evaluation was based on the following indicators: A: No powder sedimentation layer was observed at the bottom of the container, or a powder sedimentation layer was observed at the bottom of the container, but the sedimentation powder layer disappeared within 10 seconds after stirring, and the sample became uniform. B: A powder sedimentation layer was confirmed, but the sedimentation powder layer disappeared within more than 10 seconds and within 60 seconds by stirring, and the sample became uniform. C: Even after the stirring operation continued for 60 seconds, a part of the sedimentation powder layer D: The deposited powder layer in the sample was hard and difficult to scoop or stir with a spoon.
- Dispersion stability was evaluated for the powder dispersion compositions whose caking resistance evaluation was "A" or "B".
- the powder dispersion composition of each example was stored at 50° C. for one month in the same manner as in the evaluation of caking resistance, and then each sample was stirred with a spoon to redisperse the deposited powder layer.
- the redispersed sample obtained by redispersion was diluted 10,000 times with pure water to prepare a diluted sample.
- the diluted sample was subjected to DLS measurement according to the same procedure as the above-mentioned evaluation of "dispersibility" to obtain its particle size Dp3. It was compared with the particle diameter Dp1 in the above dispersibility evaluation.
- the evaluation was based on the following indicators: A: Particle size variation rate is 30% or less B: Particle size variation rate is more than 30% but less than 50% C: Particle size variation rate is more than 50% D: Samples are clearly visible after storage at 50°C for 1 month It was gelled and sampling was difficult.
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Abstract
Description
本形態による粉末分散組成物は、粉末を分散させた組成物である。当該粉末分散組成物には、通常の保管期間にわたって粉末が分散した状態を維持しているものが含まれ、さらに、当分野で通常の保管期間中に粉末が沈積するが、当分野で通常の方法によって組成物を撹拌したり容器を揺動させたりすることによって再分散が可能であるものも含まれる。また、本形態による粉末分散組成物は、水媒体中に粉末が分散した水系分散組成物で(水分散体)あってよい。当該粉末分散組成物は、直接、又は他成分と混合して用いることができ、例えば、油成分と混合して、油相及び水相の両方を含む組成物を調製することができる。本形態による粉末分散組成物に他成分を添加して得られる製品は、好適には化粧料等の皮膚塗布用製品である。
粉末分散組成物に含有させる成分(a)は、疎水化処理された金属酸化物粉末である。この疎水化処理された金属酸化物粉末は、紫外線散乱機能を有する粉末、すなわち紫外線散乱剤であると好ましい。紫外線散乱剤である場合、その一次粒子の平均粒子径は、10nm以上100nm以下である。また、その場合、疎水化処理された金属酸化物の具体例としては、酸化チタン、酸化亜鉛、酸化セリウム、タルク、シリカ、マイカ、セリサイト、カオリン、雲母チタン、黒酸化鉄、黄酸化鉄、ベンガラ、群青、紺青、酸化クロム、水酸化クロム等が挙げられる。このうち、紫外線散乱機能が高いことから、酸化チタン、酸化亜鉛であること好ましい。また、酸化チタン以外の材料からなる粒子を酸化チタンで被覆した複合粉体を用いることもできる。
成分(b)は、分散剤(若しくは界面活性剤)としての機能を有しており、疎水化された粉末の分散状態を改善できる。上記のうち、分散剤としての機能が高く、特に分散安定性の向上に寄与できることから、HLBが5以上17以下のポリエーテル変性シリコーンが好ましい。ポリエーテル変性シリコーンは、シリコーン主鎖にポリエーテル側鎖が導入されたシリコーンである。
成分(c)ヒドロキシカルボン酸塩は、溶質のゲル化を防止して、分散状態、特に分散安定性を改善できる、分散安定化剤と言える。本形態で使用されるヒドロキシカルボン酸塩に含まれるカルボキシル基の数は1以上、好ましくは1~4であってよい。また、脂肪族カルボン酸又はその誘導体の塩であってもよいし、芳香族カルボン酸又はその誘導体の塩であってもよいが、脂肪族ヒドロキシカルボン酸の塩であると好ましい。好適なヒドロキシカルボン酸塩の具体例としては、クエン酸塩が挙げられる。
成分(d)アクリル系ポリマーは、抗ケーキング剤として添加されていると言える。当該成分(d)は、(メタ)アクリル酸由来の構成単位及び/又は(メタ)アクリル酸アルキルエステル由来の構成単位を含むポリマーである。当該ポリマーは、ホモポリマーであってよいし、コポリマーであってもよいし、またクロスポリマーであってもよい。さらに、成分(d)アクリル系ポリマーは、塩基性物質で中和された塩であってよい。本形態では、当該成分(d)を所定量で配合することで、疎水化処理された粉末の分散状態を改善することが可能である。
本形態による粉末分散組成物は、上述のように水系分散組成物であり、水系成分を含んでいてよい。水系成分としては、水系成分は、化粧料、医薬部外品等の外用組成物において通常用いられる水系成分であれば、特に限定されない。水系成分には、水が含まれ、さらに、本形態の作用を妨げない範囲で、水溶性アルコール、増粘剤、保湿剤、キレート剤、防腐剤、酸化防止剤、色素等が含まれていてもよい。粉末分散組成物における水系成分の含有量は、粉末組成物の全量に対して、好ましくは45質量%以上95質量%以下、より好ましくは50質量%以上90質量%以下であってよい。
上述の粉末分散組成物は、化粧料の調製のために好適に用いられる。すなわち、本発明の一形態は、上述の粉末分散組成物を含んでなる化粧料であってよい。化粧料は、例えば、上述の粉末分散組成物に油系成分を添加することによって、油相及び水相を両方含む組成物として得られる。上述の粉末分散組成物は、好ましくは油中水型乳化組成物又は水中油型乳化組成物の調製に、特に、通常では疎水化処理された粉末の含有量を大きくし難い油中水型乳化組成物の調製に好適に用いられる。なお、本明細書における化粧料には、紫外線吸収機能を高めた化粧料、基礎化粧料(ファンデーション、ベースメイク等)、及びメークアップ化粧料(アイシャドウ、チーク等)はもちろん、日焼け止め組成物(サンスクリーン組成物)が含まれる。本形態による粉末分散組成物には、疎水化処理された金属酸化物粉末が比較的高い含有量で、且つ均一に分散されているので、化粧料の調製における操作が容易になる。また、得られる化粧料においても、疎水化処理された金属酸化物粉末が比較的高い含有量で且つ均一に分散された状態を得やすくなり、当該金属酸化物粉末の機能を向上できる。
(*2):MT-100 EMG(テイカ株式会社製)
(*3):MZX 508OTS(大東化成工業社製)
(*4):WSX MZ-500(テイカ株式会社製)
(*5):MZY-510M3S(テイカ株式会社製)
(*6):DOWSIL(登録商標)ES-5373(ダウ・ケミカル社製)
(*7):NIKKOL-BB20(日光ケミカルズ株式会社製)
(*8):エマレックス(登録商標)GM-5(日本エマルジョン株式会社製)
(*9):シリコーンSC9450N(信越化学株式会社製)
(*10):カーボポール(登録商標)980(Lubrizol Advanced Materials社製)
各例の調製直後の粉末分散組成物(原試料)、及び当該原試料を純水で10,000倍に希釈した試料(希釈試料)を準備した。そして、原試料の目視による外観観察、及び希釈試料の動的光散乱(DLS)測定によって、分散性を評価した。DLS測定には測定装置としてDLS-8000(大塚電子製、Arイオンレーザー(488nm))を用い、散乱角=90°におけるキュムラント(Cumlant)粒子径を評価のための粒子径(Dp1)とした。評価は、以下の指標に基づき行った:
A:原試料は均一であり、且つ希釈試料中の粉末の粒子径(Dp1)が150nm以下
B:原試料は均一であり、且つ希釈試料中の粉末の粒子径(Dp1)は151nm超250nm以下
C:原試料にわずかな凝集体が目視で確認されたか、又は原試料は均一であるが、希釈試料中の粒子径(Dp1)は251nm超
D:原試料中で粉末は明確に分離・凝集していた
上述の分散性評価が「A」又は「B」であった粉末分散組成物に対し、耐ケーキング性を評価した。各例の粉末分散組成物を50mLガラススクリュー管に50g充填し、常温で1か月間保管した。1か月の保管の後、ガラススクリュー管の容器底部への粉末の沈降を外観確認により判定し、沈降が確認された組成物に対しては、薬さじで所定の時間攪拌した後、状態を観察した。評価は、以下の指標に基づき行った:
A:容器底部に粉末沈降層を確認しなかった、又は、容器底部に粉末沈降層を確認したが、攪拌により10秒以内に沈積粉末層は消失し、試料は均一な状態になった
B:粉末沈降層を確認するが、攪拌によって10秒超60秒以内に沈積粉末層は消失し、試料は均一な状態になった
C:攪拌操作を60秒継続した後でも、沈積粉末層の一部は残存していた、又は、凝集体が浮遊し、試料は均一な状態ではなかった
D:試料中の沈積粉末層が硬く、薬さじで掬い取る・かき混ぜる等の操作が困難であった
上述の耐ケーキング性評価が「A」又は「B」であった粉末分散組成物に対し、分散安定性を評価した。各例の粉末分散組成物を、耐ケーキング性の評価における手順と同様にして、50℃で1か月間保管した後、各試料を薬さじでかき混ぜ、沈積粉末層を再分散した。再分散により得られた再分散試料を純水で10,000倍に希釈して希釈試料を調製した。当該希釈試料を、上記「分散性」の評価と同等の手順に従ってDLS測定を行い、その粒子径Dp3を得た。上記分散性評価における粒子径Dp1と比較した。より具体的には、下式に従って粒子径変動率を算出した:
粒子径変動率(%)=(Dp3-Dp1)/Dp1×100
評価は以下の指標に基づき行った:
A:粒子径変動率が30%以下
B:粒子径変動率が30%超、50%以下
C:粒子径変動率が50%超
D:50°Cで1か月保管後の試料が明確にゲル化しており、サンプリングが困難であった
Claims (10)
- (a)疎水化処理された金属酸化物粉末、
(b)HLBが5以上17以下のポリエーテル変性シリコーン、
(c)炭素数2以上10以下のヒドロキシカルボン酸塩、並びに
(d)(メタ)アクリル酸由来の構成単位及び/若しくは(メタ)アクリル酸アルキルエステル由来の構成単位を含むポリマー、又はその塩、を含有し、
前記成分(d)の含有量の前記成分(a)の含有量に対する比の値が、1.2×10-4以上2.3×10-3以下であり、
前記成分(c)の含有量の前記成分(a)の含有量に対する比の値が、1.2×10-3以上2.3×10-2以下である、粉末分散組成物。 - 前記成分(b)に含まれるポリエーテル鎖がポリオキシエチレン鎖である、請求項1に記載の粉末分散組成物。
- 前記成分(b)が、PEG-12ジメチコンである、請求項2に記載の粉末分散組成物。
- 前記成分(d)が、非置換の(メタ)アクリル酸由来の構成単位及び/若しくは(メタ)アクリル酸アルキルエステル由来の構成単位を含むポリマーである、請求項1又は2に記載の粉末分散組成物。
- 前記成分(d)が、カルボマー、アクリレーツ/アクリル酸アルキル(C10-30))クロスポリマー、及びポリアクリル酸ナトリウムからなる群から選択される1種以上である、請求項4に記載の粉末分散組成物。
- 前記成分(c)が、クエン酸塩である、請求項1又は2に記載の粉末分散組成物。
- 前記成分(a)が、一次粒子の平均粒径1μm以下の粉末である、請求項1又は2に記載の粉末分散組成物。
- 水を20質量%以上70質量%以下で含有する、請求項1又は2に記載の粉末分散組成物。
- 請求項1又は2に記載の粉末分散組成物を含有する、化粧料。
- 油中水型乳化組成物である、請求項9に記載の化粧料。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003063919A (ja) * | 2001-08-23 | 2003-03-05 | Nippon Shikizai Inc | 固形状油中水系化粧料 |
| WO2013018827A1 (ja) * | 2011-08-03 | 2013-02-07 | 堺化学工業株式会社 | 分散体 |
| JP2013193999A (ja) * | 2012-03-21 | 2013-09-30 | Shiseido Co Ltd | 水中油型乳化化粧料 |
| JP2019038781A (ja) * | 2017-08-25 | 2019-03-14 | 富士フイルム株式会社 | 油中水型化粧料 |
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|---|---|---|---|---|
| JP2003063919A (ja) * | 2001-08-23 | 2003-03-05 | Nippon Shikizai Inc | 固形状油中水系化粧料 |
| WO2013018827A1 (ja) * | 2011-08-03 | 2013-02-07 | 堺化学工業株式会社 | 分散体 |
| JP2013193999A (ja) * | 2012-03-21 | 2013-09-30 | Shiseido Co Ltd | 水中油型乳化化粧料 |
| JP2019038781A (ja) * | 2017-08-25 | 2019-03-14 | 富士フイルム株式会社 | 油中水型化粧料 |
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