CN117222392A - Oil-in-water type emulsified cosmetic - Google Patents
Oil-in-water type emulsified cosmetic Download PDFInfo
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- CN117222392A CN117222392A CN202280028319.8A CN202280028319A CN117222392A CN 117222392 A CN117222392 A CN 117222392A CN 202280028319 A CN202280028319 A CN 202280028319A CN 117222392 A CN117222392 A CN 117222392A
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- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- CZWLNMOIEMTDJY-UHFFFAOYSA-N hexyl(trimethoxy)silane Chemical compound CCCCCC[Si](OC)(OC)OC CZWLNMOIEMTDJY-UHFFFAOYSA-N 0.000 description 1
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- 230000001771 impaired effect Effects 0.000 description 1
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- 239000011147 inorganic material Substances 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- XUGNVMKQXJXZCD-UHFFFAOYSA-N isopropyl palmitate Chemical compound CCCCCCCCCCCCCCCC(=O)OC(C)C XUGNVMKQXJXZCD-UHFFFAOYSA-N 0.000 description 1
- 229940119170 jojoba wax Drugs 0.000 description 1
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- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
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- 229940105132 myristate Drugs 0.000 description 1
- JXTPJDDICSTXJX-UHFFFAOYSA-N n-Triacontane Natural products CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC JXTPJDDICSTXJX-UHFFFAOYSA-N 0.000 description 1
- DVEKCXOJTLDBFE-UHFFFAOYSA-N n-dodecyl-n,n-dimethylglycinate Chemical compound CCCCCCCCCCCC[N+](C)(C)CC([O-])=O DVEKCXOJTLDBFE-UHFFFAOYSA-N 0.000 description 1
- 229960002715 nicotine Drugs 0.000 description 1
- SNICXCGAKADSCV-UHFFFAOYSA-N nicotine Natural products CN1CCCC1C1=CC=CN=C1 SNICXCGAKADSCV-UHFFFAOYSA-N 0.000 description 1
- SLYCYWCVSGPDFR-UHFFFAOYSA-N octadecyltrimethoxysilane Chemical compound CCCCCCCCCCCCCCCCCC[Si](OC)(OC)OC SLYCYWCVSGPDFR-UHFFFAOYSA-N 0.000 description 1
- 229940073665 octyldodecyl myristate Drugs 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 229940055577 oleyl alcohol Drugs 0.000 description 1
- XMLQWXUVTXCDDL-UHFFFAOYSA-N oleyl alcohol Natural products CCCCCCC=CCCCCCCCCCCO XMLQWXUVTXCDDL-UHFFFAOYSA-N 0.000 description 1
- 239000004006 olive oil Substances 0.000 description 1
- 235000008390 olive oil Nutrition 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000010702 perfluoropolyether Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229940110977 polyglycerin-4 Drugs 0.000 description 1
- 229920000223 polyglycerol Polymers 0.000 description 1
- 229940097941 polyglyceryl-10 laurate Drugs 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000036556 skin irritation Effects 0.000 description 1
- 231100000475 skin irritation Toxicity 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229940032094 squalane Drugs 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229940071136 stearoyl glutamate Drugs 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229940117986 sulfobetaine Drugs 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- WUMSTCDLAYQDNO-UHFFFAOYSA-N triethoxy(hexyl)silane Chemical compound CCCCCC[Si](OCC)(OCC)OCC WUMSTCDLAYQDNO-UHFFFAOYSA-N 0.000 description 1
- FZMJEGJVKFTGMU-UHFFFAOYSA-N triethoxy(octadecyl)silane Chemical compound CCCCCCCCCCCCCCCCCC[Si](OCC)(OCC)OCC FZMJEGJVKFTGMU-UHFFFAOYSA-N 0.000 description 1
- NMEPHPOFYLLFTK-UHFFFAOYSA-N trimethoxy(octyl)silane Chemical compound CCCCCCCC[Si](OC)(OC)OC NMEPHPOFYLLFTK-UHFFFAOYSA-N 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 150000003722 vitamin derivatives Chemical class 0.000 description 1
- 239000007762 w/o emulsion Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 239000000811 xylitol Substances 0.000 description 1
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 1
- 235000010447 xylitol Nutrition 0.000 description 1
- 229960002675 xylitol Drugs 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- 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
- A61K8/06—Emulsions
-
- 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
-
- 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
- A61K8/37—Esters of carboxylic acids
-
- 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
-
- 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
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Birds (AREA)
- Emergency Medicine (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Dermatology (AREA)
- Cosmetics (AREA)
Abstract
An oil-in-water type emulsified cosmetic comprises, in proportion: an aqueous polymer (A) containing 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof as a structural unit, an ultraviolet scattering agent (B) comprising an inorganic powder which has been subjected to a hydrophobization treatment with a trialkoxyalkylsilane in an amount of 10 to 40% by mass, a polyhydroxystearic acid (C) in an amount of 0.1 to 5% by mass, a polyglycerin fatty acid ester (D) having an HLB value of 5 to 8 in an amount of 0.1 to 5% by mass, a liquid oil (E) in an amount of 7 to 40% by mass, and water (F) in an amount of 30 to 80% by mass, wherein the oil-in-water emulsion cosmetic is an emulsion in which an oil phase containing each of the components (B) to (E) is dispersed in an aqueous phase containing the components (A) and (F), and the content of the component (B) in the oil phase is 40 to 70% by mass. The oil-in-water type emulsified cosmetic may contain (G) a hydrophilic surfactant and (H) a polyol.
Description
Technical Field
The present invention relates to an oil-in-water type emulsion cosmetic suitable for use as a sunscreen cream, and more particularly, to an oil-in-water type emulsion cosmetic excellent in sunscreen effect, feel in use and storage stability.
Background
In general, an organic ultraviolet absorber or an ultraviolet scattering agent composed of inorganic fine particles such as titanium oxide and zinc oxide is used as a sunscreen component in a sunscreen cosmetic. Among them, from the viewpoint of toxicity when the amount of the organic ultraviolet absorber added is increased to enhance the ultraviolet absorbing effect, it is desirable to use an ultraviolet scattering agent composed of inorganic fine particles from the viewpoint of importance of safety.
As a formulation of the sunscreen cosmetic, an oil-in-water type or water-in-oil type emulsion formulation is widely used, but the continuous phase oil-in-water type sunscreen cosmetic gives a tender feel to water when applied to the skin, and is excellent in easy spreading and spreading. On the other hand, oil-in-water type emulsifiers have disadvantages of insufficient water resistance and storage stability, and attempts have been made to improve these disadvantages.
For example, patent document 1 discloses an oil-in-water type emulsified cosmetic comprising: a fine-particle inorganic powder (a) subjected to a hydrophobic organic surface treatment, a surfactant (B) such as a polyglycerin fatty acid ester having an HLB of 9.5 or less, and a water-based thickener (refer to claim 1). The present invention uses a specific surfactant having an HLB of 9.5 or less, preferably 8 to 9.5, whereby the hydrophobic fine-particle inorganic powder can be stably incorporated into the aqueous phase (see paragraph 0014). O/W type sunscreens using polyglycerol-10 distearate, polyglycerol-6 oleate, polyglycerol-2 distearate, polyglycerol-10 triisostearate and the like as surfactants are also disclosed (reference examples 1 to 16), most of which use a dispersion in which a particulate inorganic substance is dispersed in an aqueous medium in advance. In this way, when applying cosmetics in which fine-particle inorganic powder is dispersed in an aqueous medium, there is a problem that aggregation of fine-particle inorganic powder is easily caused by evaporation of water, and false white (phenomenon of unnatural whitening when applying skin) is generated. The O/W type sunscreen cream described in example 15 was prepared by mixing with other components such as sorbitan sesquiisostearate (HLB: 4.5), PEG-12 isostearate (HLB: 12) without dispersing the fine inorganic powder in an aqueous medium. Although this example 15 does not describe a specific production method, it is not clear whether or not the particulate inorganic powder is dispersed in either the aqueous phase or the oil phase, since the technical feature of the present invention is that "oil-in-water type emulsified cosmetic containing the particulate inorganic powder subjected to the hydrophobic organic surface treatment" is the present invention (refer to paragraph 0001), it is considered that the cosmetic of example 15 is a cosmetic containing the particulate inorganic powder in the aqueous phase as in other examples.
On the other hand, fine-particle inorganic powder subjected to hydrophobic organic surface treatment is known as an oil-in-water type emulsion cosmetic dispersed in an oil phase, and for example, patent document 2 discloses an oil-in-water type emulsion cosmetic comprising (a) zinc oxide, (b) a crosslinked copolymer of acrylamide-2-methylpropanesulfonic acid and/or a sodium acryloyldimethyltaurate copolymer, (c) a nonionic surfactant and/or a hydrophilic surfactant having an HLB of 10 or more, (d) water and (e) silicone oil, (a) zinc oxide dispersed in an oil system comprising (e) silicone oil. The oil phase of the cosmetic contains zinc oxide, and is excellent in storage stability (stability with time), feel in use, and water resistance (paragraph 0011). Further, the good storage stability of the cosmetic is obtained by dispersing zinc oxide in an oil phase which is an oil system (refer to paragraph 0033). The description is: however, in the case of this cosmetic, it is necessary to contain silicone oil as at least a part of the oil component, and when other oil components such as liquid paraffin are used, good results cannot be obtained (see paragraphs of comparative examples 3 and 0055 in table 3), and in addition, since inorganic fine particles such as zinc oxide have a high aggregation force between ordinary fine particles, the viscosity of the oil phase increases, and therefore, there is a problem that it is difficult to finely disperse the oil phase in the aqueous phase.
Further, patent document 3 discloses an oil-in-water type sunscreen cosmetic comprising: (a) a silicon active agent having an HLB of 8 or less modified with any one of a carboxyl group, an amide group, a pyrrolidone carboxyl group, an ester group, a glyceryl group, and a polyglyceryl group, (b) a low-viscosity silicone oil, (c) an ultraviolet scattering agent composed of a hydrophobicized inorganic powder, (d) a water-soluble polymer compound, (e) a nonionic surfactant having an HLB of 10 or more, and (f) water, and (c) the component (c) being substantially dispersed in an oil phase (refer to claim 2). In the cosmetic, the component (a) is added as a dispersant for the component (c), thereby improving the dispersibility of the ultraviolet scattering agent in the oil phase. However, since this cosmetic preparation requires the use of a specific silicon active agent and a low viscosity silicone oil, there are limitations in terms of raw materials, and there is a problem of insufficient feeling of use due to the use of a nonionic surfactant having an HLB of 10 or more as an emulsifier (refer to comparative example 3 later).
In this way, although oil-in-water type emulsified cosmetics obtained by adding an ultraviolet scattering agent composed of a hydrophobicized inorganic powder to an oil phase are conventionally known, in order to improve the ultraviolet shielding effect, it is intended that dispersion failure occurs when the concentration of the hydrophobicized inorganic powder in the oil phase is increased, and even if a dispersant (for example, polyhydroxystearic acid or sorbitan sesquiisostearate) which is generally favored is used, sufficient dispersibility cannot be obtained (refer to comparative example 4 described later).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2016-074660
Patent document 2: japanese patent publication No. 2005-272389
Patent document 3: japanese patent publication No. 2014-201519
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made in view of the above background art, and an object thereof is to provide an oil-in-water type emulsified cosmetic having excellent sunscreen effect, feel in use and storage stability.
Means for solving the problems
The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that, in an oil-in-water type emulsified cosmetic composition obtained by dispersing an inorganic powder subjected to hydrophobization in an oil phase, the use of a specific hydrophobization inorganic powder in combination with the use of a specific dispersant and a specific surfactant enables good dispersibility to be obtained even when an ultraviolet scattering agent composed of an inorganic powder is contained at a high concentration, and completed the present invention.
Thus according to the present invention there is provided an oil-in-water type emulsified cosmetic comprising in proportion: an aqueous polymer (A) containing 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof as a structural unit, an ultraviolet scattering agent (B) comprising an inorganic powder which has been subjected to a hydrophobization treatment with a trialkoxyalkylsilane in an amount of 10 to 40% by mass, a polyhydroxystearic acid (C) in an amount of 0.1 to 5% by mass, a polyglyceryl fatty acid ester (D) having an HLB value of 5 to 8 in an amount of 0.1 to 5% by mass, a liquid oil (E) in an amount of 7 to 40% by mass, and water (F) in an amount of 30 to 80% by mass, wherein the oil-in-water emulsion cosmetic comprises an oil phase containing the components (B) to (E) dispersed in an aqueous phase containing the components (A) and (F), and the content of the component (B) in the oil phase is 40 to 70% by mass.
ADVANTAGEOUS EFFECTS OF INVENTION
The oil-in-water type emulsion cosmetic of the present invention is excellent in sun protection effect, feeling in use and storage stability.
Detailed Description
The oil-in-water type emulsified cosmetic composition of the present invention comprises, as essential components, an aqueous polymer (A) containing 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof as a structural unit, an ultraviolet scattering agent (B) composed of an inorganic powder subjected to hydrophobization treatment with a trialkoxyalkylsilane, polyhydroxystearic acid (C), a polyglycerin fatty acid ester (D) having an HLB value of 5 to 8, a liquid oil (E), and water (F). The components are described in detail below.
(A: water-based Polymer)
The aqueous polymer used as the component (a) of the present invention is an aqueous polymer for stabilizing an oil-in-water emulsion, and is preferably a copolymer or a crosslinked polymer having 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof (hereinafter, abbreviated as "AMPS") as a structural unit. In addition, the term "2-acrylamido-2-methylpropanesulfonic acid" has the same meaning as "acryloyldimethyltaurate". Specific examples of the aqueous polymer include (acryl dimethyl taurate/VP) copolymer, (acryl dimethyl taurate Na/VP) crosslinked polymer, (dimethylacrylamide/acryl dimethyl taurate Na) crosslinked polymer, (acrylamide/acryl dimethyl taurate Na) copolymer, (acrylic acid Na/acryl dimethyl taurate Na) copolymer, and (acrylic acid hydroxyethyl/acryl dimethyl taurate Na) copolymer. Among them, a (Na acrylate/Na acryl dimethyl taurate) copolymer and a (hydroxyethyl acrylate/Na acryl dimethyl taurate) copolymer are preferably used.
Examples of commercial products of the aqueous polymer include FLOCARE PSD-30 manufactured by SNF Co., ltd. (Na/Na acryloyldimethyl taurate) copolymer, SIMULGEL-EG manufactured by SEPPIC Co., ltd., which is a dispersion containing the polymer, SIMULGEL-NS comprising a dispersion of (Na acryloyldimethyl taurate) copolymer, and the like.
The content of the component (a) is 0.1 to 3% by mass, preferably 0.2 to 2% by mass, more preferably 0.3 to 1.5% by mass, based on the whole cosmetic. When the content of the component (a) is too low, the oil phase and the water phase are liable to separate, float, break, aggregate, etc., and therefore the stability is poor, and when the content is too high, the skin is hardly spread. In the following description, the mass% of each component is based on the whole cosmetic.
(B: ultraviolet scattering agent)
The component (B) used in the present invention is an inorganic powder which is used as an ultraviolet scattering agent and which has been subjected to a hydrophobization treatment with a trialkoxyalkylsilane. The inorganic powder as the base may be any inorganic powder that can be incorporated into a general sunscreen cosmetic, and specific examples thereof include zinc oxide, titanium oxide, cerium oxide, zirconium oxide, and iron oxide. Of these, only one kind may be used, or 2 or more kinds may be used simultaneously, and further 2 or more kinds of composite powder may be used. Among them, zinc oxide or titanium oxide is preferable from the viewpoints of the feel of use and the cosmetic effect of the cosmetic. The particle size, shape, etc. of the inorganic powder are not particularly limited, and the average primary particle size is preferably in the range of 1 to 100nm from the viewpoint of the effect of protecting against ultraviolet rays. These particle diameters can be obtained as a number average particle diameter using a transmission type or scanning electron microscope. The geometric form of the inorganic powder may be any form as long as it is a powder generally used for sunscreen cosmetics, such as a sphere, a polyhedron, a spindle, a needle, and a plate. These inorganic powders are generally surface-treated with an inorganic material such as aluminum or silica in order to provide blocking of surface activity, dispersibility, and the like. In general, in order to impart water repellency and dispersibility to these powders, hydrophobization treatment is performed with an oil agent, a metal soap, an organopolysiloxane, fluorine, or the like, but in the present invention, it is necessary to use a powder treated with a trialkoxyalkylsilane. In place of the trialkoxyalkylsilane, the effect of the present invention cannot be obtained by using another silicon compound, for example, even by using a hydrophobized inorganic powder treated with hydrogenated polydimethylsiloxane (see comparative example 6).
The trialkoxyalkylsilane is a compound in which 3 alkoxy groups and 1 alkyl group are bonded to each other in a silicon atom, and the alkoxy groups can cover the surface of the powder by reacting with hydroxyl groups or the like on the surface of the powder. Such trialkoxyalkylsilanes can be used with the following general formula (1):
CH 3 (CH 2 ) m S i (O(C n H 2n + 1 )) 3 (1) (m and n are positive integers, m=5 to 20, and n=1 to 3).
The carbon number of the alkoxy group is preferably 1 to 3, and specific examples thereof include methoxy, ethoxy, propoxy, and the like. The alkyl group preferably has 6 to 18 carbon atoms, and specific examples thereof include hexyl, octyl, decyl, octadecyl, and the like. Examples of such trialkoxyalkylsilanes include hexyltrimethoxysilane, octyltrimethoxysilane, decyltrimethoxysilane, octadecyltrimethoxysilane, hexyltriethoxysilane, octyltriethoxysilane (cosmetic name), decyltriethoxysilane, and octadecyltriethoxysilane, and these may be used alone or in combination of 2 or more.
Among them, since the dispersibility of the component (B) in the oil phase is excellent, it is preferable to use a trialkoxyalkylsilane having an alkyl group with a carbon number of 8 to 22, and particularly, when triethoxyoctylsilane having m=7 and n=2 in the above general formula (1) is used, excellent dispersibility is obtained.
The fine particle powder surface-coated with the trialkoxyalkylsilane of component (B) may be a commercially available product. As examples of the commercial products, MTX-05OTS (average particle size 10 nm) manufactured by Tayca Co., ltd. As triethoxyoctylsilane coated particulate titanium oxide, MZX-508OTS (average particle size 25 nm) manufactured by Tayca Co., ltd. As triethoxyoctylsilane coated particulate zinc oxide, and MZX-304OTS (average particle size 35 nm) can be given.
The content of the component (B) is 10 to 40% by mass, preferably 12 to 38% by mass, more preferably 15 to 35% by mass, and still more preferably 18 to 35% by mass. When the content of the component (B) is too small, a high sunscreen effect cannot be obtained, and when it is too large, the viscosity of the oil phase becomes high, fine emulsified particles cannot be obtained, the storage stability is lowered, and the ease of spreading on the skin is lowered.
The mass ratio of the powder component in the oil phase containing the component (B) to the whole oil phase [ the ratio of the powder component in the oil phase is 40 to 70 mass%, preferably 50 to 60 mass%). When the amount of the component (B) is within this range, a high sunscreen effect and excellent feel in use (easy-to-spread and tender skin feel) and storage stability can be satisfied.
(C: polyhydroxystearic acid)
In the present invention, as the dispersant for the inorganic powder contained in the oil phase, (C) polyhydroxystearic acid is used. The polyhydroxystearic acid is a polymer of hydroxystearic acid having one hydroxyl group, and in the present invention, the hydroxyl group of hydroxystearic acid is preferably at the 12-position, and the degree of polymerization of hydroxystearic acid is 3 to 12, more preferably 4 to 8. By containing the component (C), even if a large amount of the inorganic powder of the component (B) is blended in the oil phase, the increase in viscosity of the oil phase can be suppressed, and excellent feeling of use and storage stability can be achieved. As the commercial product of the component (C), for example, SALACOS HS-6C (manufactured by Riqing Oliyou group Co., ltd.) can be cited. The content of the component (C) is 0.1 to 5% by mass, preferably 0.2 to 3% by mass, more preferably 0.3 to 2% by mass. When the content of the component (C) is too small, the dispersion of the component (B) becomes insufficient, and the feeling of use and the storage stability are lowered. When the content of the component (C) is too large, tackiness is generated.
(D: polyglycerol fatty acid ester)
In the present invention, the oil phase contains (D) a polyglycerin fatty acid ester having an HLB value of 5 to 8 for stabilization of an oil-in-water emulsion. By providing the component (D) in the oil phase, the oil phase containing a large amount of fine particle powder can be stably dispersed in the water phase, and a good feeling of use and high storage stability in a tender and long-lasting state can be achieved.
The fatty acid of the hydrophobic moiety of the polyglycerin fatty acid ester has preferably 12 to 30 carbon atoms, more preferably 16 to 22 carbon atoms. The fatty acid may be a saturated fatty acid or an unsaturated fatty acid, and a branched chain may be present or absent in the carbon chain, but is preferably an unsaturated fatty acid or a saturated branched fatty acid. The hydrophilic group of the polyglycerin fatty acid ester is preferably glycerin having a polymerization degree of 2 to 20, more preferably 4 to 15, particularly preferably 10.
The HLB of the polyglycerin fatty acid ester is 5 to 8, preferably 6 to 7.5. Since the HLB value is within this range, the oil phase containing a large amount of fine particle powder can be stably dispersed in the aqueous phase, and a good feeling of use and high storage stability in a tender state can be achieved. However, if a polyglycerin fatty acid ester having an HLB of more than 8 or less than 5 is used, it is difficult to obtain fine emulsion droplets, and the feeling of use and storage stability become insufficient. The HLB is an index indicating the balance between hydrophilicity and lipophilicity of a nonionic surfactant, and the hydrophilicity is higher as the lipophilicity is closer to 0 and the hydrophilicity is higher as the lipophilicity is closer to 20. As a calculation method of the HLB value, in addition to a plurality of known calculation methods, a commodity list or the like provided by the manufacturer is also described as a value thereof. In the present specification, when the nonionic surfactant is a commercially available product, the HLB value of the nonionic surfactant is the HLB value described in the manufacturer's catalogue, and when the nonionic surfactant is not a commercially available product, a numerical value calculated by the method Griffin (Griffin) (HLB value=20×sum of formulas of hydrophilic units/molecular weight) described in "the surfactant review" page 307 (published by industrial book corporation, 1960) is used.
The polyglycerin fatty acid ester is preferably polyglycerin-10 trioleate, polyglycerin-6 diisostearate, polyglycerin-10 tristearate, polyglycerin-2 sesquioctanoate, polyglycerin-4 stearate, polyglycerin-10 triisostearate, polyglycerin-10 pentatriisostearate, or the like, particularly preferably polyglycerin-10 trioleate, and 1 or 2 or more of these may be arbitrarily used. Examples of the commercially available products of the component (D) include NIKKKOL Decaglyn 3-OV (manufactured by Nikko Chemicals, polyglycerin-10 trioleate, HLB value of 7), EMALEX DISG-6 (manufactured by Japanese emulsion Co., ltd., polyglycerin-6 diisostearate, HLB value of 8), NIKOL Decaglyn 3-SV (manufactured by Nikko Chemicals, polyglycerin-10 trioleate, HLB value of 7.5) and the like.
The content of the component (D) is 0.1 to 5% by mass, preferably 0.2 to 3% by mass, more preferably 0.3 to 2% by mass. When the content of the component (D) is too small, the feeling of use and the storage stability are lowered. If the content of the component (D) is too large, tackiness may occur.
(E: liquid oil component)
In the oil-in-water type sunscreen cosmetic of the present invention, the liquid oil component (E) is used for dispersing the inorganic powder of the component (B) as the sunscreen component and spreading on the skin. The term "liquid oil component" refers to an oil component having fluidity at normal temperature (25 ℃) and a semisolid oil component having a melting point of less than 50 ℃.
The liquid oil component (E) used in the present invention is not particularly limited as long as it is used in a usual cosmetic, and may be any of animal oil, vegetable oil and synthetic oil. Specific examples of the liquid oil component include esters of glycerol tri (ethylhexanoate), caprylic/capric triglyceride, neopentyl glycol dicaprate, isononyl isononanoate, isotridecyl isononanoate, ethylhexyl palmitate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, diisostearyl malate, oligomeric esters of dimer acid and dimer diol, pentaerythritol tetraisostearate, diglycerol tetraisostearate, cetyl isooctanoate, cholesterol fatty acid ester, jojoba oil, and the like; hydrocarbons such as volatile isoparaffins, polybutenes, polyisobutenes, heavy mobile isoparaffins, liquid paraffin, α -olefin oligomers, squalane, and vaseline; oils and fats such as olive oil, castor oil, mink oil, macadamia nut (Macadamia nut) oil, and the like; fatty acids such as isostearic acid and oleic acid; higher alcohols such as oleyl alcohol and isostearyl alcohol; silicone oils such as low-polymerization-degree polydimethylsiloxane, cyclic silicon, high-polymerization-degree polydimethylsiloxane, phenyl methyl polysiloxane, methyl trimethyl siloxane, octyl trimethyl siloxane, crosslinked organopolysiloxane, and fluorine-modified polysiloxane; fluorine-containing oils such as perfluoropolyether; lanolin derivatives such as lanolin, acetylated lanolin, isopropyl lanolate, and lanolin alcohol; etc.
The viscosity of the liquid oil component at 25℃is usually 1 to 200 mPas, preferably 5 to 100 mPas, and particularly preferably an ester oil. The viscosity of the liquid oil component was measured by a B-type viscometer. As specific examples of the ester oil, there may be exemplified tri (ethylhexanoate), caprylic/capric triglyceride, neopentyl glycol dicaprate, isononyl isononanoate, isotridecyl isononanoate, ethylhexyl palmitate, isopropyl myristate. The content of the ester oil having a viscosity of 1 to 200 mPas at 25℃is preferably 10 to 100% by mass based on the whole liquid oil component.
The content of the liquid oil component (E) is preferably 7 to 40% by mass, more preferably 10 to 35% by mass, and even more preferably 12 to 30% by mass. When the component (E) is too small, the fine particulate metal oxide of the component (B) is difficult to disperse, and the ease of extension is also lowered. When the component (E) is too much, the sense of moisture is lacking, and a sticky feel is obtained.
(oil phase)
The oil-in-water type sunscreen cosmetic of the present invention may contain, in addition to the components (B) to (E) used in the present invention, an oil-soluble component and an oil-dispersible component which are usually used in cosmetics.
Examples of the oil-soluble component and the oil-dispersible component that can be incorporated include an organic ultraviolet absorber, a solid oil component, a lipophilic nonionic surfactant having an HLB value of 8 or less other than the component (D), an oil-soluble resin, an oil-soluble antioxidant, an oil-soluble active ingredient such as an oil-soluble vitamin or an oil-soluble animal and plant extract, and a powder other than the component (B).
Since the organic ultraviolet absorber may be more sensitive to skin irritation than the inorganic fine particle powder, the organic ultraviolet absorber is contained in an amount of not more than 4 mass%, particularly preferably not more than 3 mass%, and most preferably not contained in the whole cosmetic.
Examples of the powder other than the component (B) include inorganic powders such as pigment-grade titanium oxide, iron oxide, talc, and mica; organic powders such as polymer powder and metal soap; pigment powders such as tar-based pigments, metal powders, composite powders, and the like are preferable from the viewpoints of storage stability and feel in use, and the powder surface is preferably hydrophobic or lipophilic, or is subjected to a hydrophobization treatment or a lipophilication treatment.
In the oil-in-water type sunscreen cosmetic of the present invention, the content of the oil phase is preferably 20 to 70% by mass, more preferably 25 to 60% by mass, and even more preferably 30 to 50% by mass, relative to the entire sunscreen cosmetic. When the oil phase content is too small, the inorganic powder cannot be contained in a large amount, and the sun-screening effect is poor. When the oil phase content is too large, the texture is not tender, sticky feeling is obtained, and the storage stability is lowered.
(aqueous phase)
In the oil-in-water type sunscreen cosmetic of the present invention, the aqueous phase may contain a water-soluble component and a water-dispersible component used in general cosmetics, in addition to the aqueous polymer of the component (a) and the water of the component (F). Examples of the water-soluble or water-dispersible component to be blended include water-soluble active ingredients such as low-carbon alcohols, polyhydric alcohols, water-soluble polymers other than the component (a), hydrophilic nonionic surfactants, water-soluble vitamins, and water-soluble animal and plant extracts, pH adjusters, chelating agents, water-soluble antioxidants, and water-soluble antibacterial agents.
In the oil-in-water type sunscreen cosmetic of the present invention, the aqueous phase preferably contains a hydrophilic surfactant as the component (G). By containing the hydrophilic surfactant, the oil-in-water type emulsion type is stable and easily obtained. Examples of the hydrophilic surfactant include anionic surfactants, amphoteric surfactants, and nonionic surfactants having an HLB value of more than 8.
Specific examples of the anionic surfactant include higher fatty acid salts such as Na stearate, acylated amino acid salts such as Na stearoyl glutamate and Na lauroyl glycine, alkyl ether carboxylate and alkyl sulfate.
Examples of the amphoteric surfactant include glycine betaine type amphoteric surfactants such as lauryl betaine, glycine type amphoteric surfactants such as lauramidopropyl betaine, and sulfobetaine type amphoteric surfactants such as laurylhydroxysulfonamide.
Examples of the nonionic surfactant having an HLB value of more than 8 include polyglyceryl fatty acid esters such as polyglyceryl-10 laurate, polyglyceryl-10 myristate, and polyglyceryl-10 oleate; polyoxyethylene hydrogenated castor oil such as PEG-60 hydrogenated castor oil; polyoxyethylene fatty acid esters such as PEG-10 oleate; polyoxyethylene fatty acid glycerides such as PEG-15 glycerol oleate; polyoxyethylene alkyl ether; fatty acid polyoxyethylene alkyl ethers; polyoxyethylene sorbitan fatty acid esters; polyoxyethylene polyoxypropylene copolymers; polyoxyethylene polyoxypropylene copolymers and ethers of long chain alcohols, and the like.
Among these hydrophilic surfactants, nonionic surfactants having an HLB value of more than 8 are preferably used, and among them, polyglycerin fatty acid esters, polyoxyethylene fatty acid glycerides, and polyoxyethylene hardened castor oil are preferably used.
When the hydrophilic surfactant is used, the content thereof is preferably 0.1 to 3% by mass based on the whole cosmetic. When the hydrophilic surfactant is contained, the stability of the emulsion is improved, and when the content thereof is too large, the water resistance of the coating film is lowered.
In the oil-in-water type sunscreen cosmetic of the present invention, the aqueous phase preferably contains a polyhydric alcohol as the component (H). The water-in-oil emulsion type is stable and easily obtained by containing a polyhydric alcohol to enhance the moisture retention of the skin. Examples of the polyhydric alcohol include glycerin, diglycerin, propylene glycol (cosmetic display name: PG), dipropylene glycol (cosmetic display name: DPG), propylene glycol, butylene glycol (cosmetic display name: BG), sorbitol, xylitol, polyethylene, and the like. The preferable content of the component (H) is 2 to 30% by mass.
Examples of the water-soluble polymer other than the component (a) include carboxyvinyl polymer, sodium polyacrylate, acrylic acid/methacrylic acid alkyl copolymer, hydroxyethyl cellulose, hydroxypropyl methylcellulose, guar gum, carrageenan, xanthan gum, pullulan, and the like. Among them, nonionic water-soluble polymers such as xanthan gum, hydroxyethyl cellulose, hydroxymethyl cellulose and pullulan are preferably used because they are hardly affected by the polyvalent metal ion derived from the particulate metal oxide as an essential component.
The aqueous phase may contain a fine-particle inorganic powder as long as the effect of the present invention is not substantially impaired, and if the inorganic powder is present in the aqueous phase, the use feeling of the aqueous phase is reduced in terms of the sense of tenderness and the ease of extension, and the visible light-shielding property is increased and the pseudo-white phenomenon is easily generated because the aqueous phase contains an equivalent amount of fine-particle metal oxide as compared with the oil phase. Therefore, when the fine-particle inorganic powder is contained in the aqueous phase, the content thereof is 5% by mass or less, preferably 1% by mass or less, and particularly preferably, the fine-particle inorganic powder is not substantially contained in the aqueous phase.
In the oil-in-water type emulsified cosmetic composition of the present invention, the content of the aqueous phase is preferably 30 to 80% by mass, more preferably 40 to 75% by mass, and even more preferably 50 to 70% by mass, relative to the whole cosmetic composition. When the content of the aqueous phase is too small, the skin feel is poor, the skin feel is sticky, the storage stability is lowered, and when the content of the aqueous phase is too large, a large amount of particulate metal oxide cannot be contained, and the sun protection effect is lowered.
The oil-in-water type emulsified cosmetic of the present invention can be prepared by a conventional method. For example, an oil phase containing the components (B) to (D) and an aqueous phase containing the component (a) are prepared separately, and the oil phase is added to the aqueous phase or the aqueous phase is added to the oil phase while stirring, and emulsification is performed. The method of adding an oil phase to an aqueous phase facilitates obtaining an emulsion having excellent storage stability, as compared with the contrary.
When the aqueous phase contains (G) a hydrophilic surfactant and (H) a polyol, the aqueous phase can be prepared by a method (hereinafter referred to as a D-phase emulsification method) in which a mixture called D-phase (surfactant phase) containing these is formed in advance, and then an oil phase is gradually added with stirring to prepare a gel-like emulsion (O/D phase), and then the aqueous phase is added to prepare an oil-in-water emulsion. When the cosmetic is produced by the D-phase emulsification method, stable emulsion having a small particle size can be obtained, and the cosmetic can be efficiently obtained, which has excellent ease of spreading on the skin and a tender skin feel. In addition, the D-phase emulsification method is a method of preparing a D-phase by mixing the (G) component and the (H) component in advance, and since both the (G) component and the (H) component are hydrophilic, the amounts thereof are treated as a part of the amount of the aqueous phase in the present invention.
The oil-in-water type sunscreen cosmetic of the present invention may be in any form of cream, gel, emulsion, or liquid (thin emulsion). The cosmetic can be used not only as a sunscreen cosmetic but also as other cosmetics for imparting ultraviolet shielding effect. Specific examples of the other cosmetics include color cosmetics such as foundations and barrier creams, skin care cosmetics such as lotions, creams, lotions, BB creams and CC creams, and hair cosmetics.
Examples
The present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited thereto. The amount to be added in the prescription described below is a relative total amount by mass unless otherwise specified.
The methods for evaluating oil-in-water type sunscreen cosmetics in the following examples and comparative examples are as follows.
(evaluation methods a to c)
Regarding the following evaluation items a to c,10 panelists applied each sample to the face, and performed 4-level functional evaluation based on the following scoring criteria (scores).
(evaluation item)
a. Ease of extension
b. Tender feeling
c. False white feeling
(scoring)
5, the method comprises the following steps: is very excellent.
4, the following steps: excellent.
3, the method comprises the following steps: generally, the method is used for the treatment of a disease.
2, the method comprises the following steps: and (3) difference.
1, the method comprises the following steps: very poor.
(evaluation criterion)
A: score average value of 4.0 points or more
B: the average score is more than 3.5 and less than 4.0
C: the average score is more than 2.5 and less than 3.5
D: the average score is less than 2.5 points
(evaluation method: viscosity stability)
After the water-based emulsion cosmetics of examples and comparative examples were prepared, the viscosity at 25℃was measured using a type B viscometer (TVB-10M; manufactured by Tokyo Co., ltd.) after the next day (initial viscosity) and storage at 40℃for 1 week. The viscosity change rate (%) =100× (viscosity after 1 week of storage at 40 ℃), and the ratio was determined using the following evaluation criteria.
(evaluation criterion)
A: rate of change of viscosity; more than 70 percent
B: a rate of change of viscosity; more than 50 percent and less than 70 percent
C: a rate of change of viscosity; less than 50%
D: immediately after preparation, a homogeneous oil-in-water type emulsified composition cannot be obtained
Examples 1 to 3 and comparative examples 1 to 8
< Sun protection emulsion >)
The sunscreen emulsion shown in Table 1 was prepared according to the following production procedure (D-phase emulsification method), and evaluated by the evaluation method described above. The results are also shown in Table 1. In comparative example 3, 1.00% of polyglycerin-10 laurate (component No. 15) was used as a hydrophilic surfactant in the preparation of the oil phase, and the amount of polyglycerin-10 laurate was treated as a part of the water phase amount in consideration of the fact that the polyglycerin-10 laurate was not present in the oil phase in the preparation of the emulsion.
(manufacturing step)
(1) The components 1 to 3 are mixed to prepare phase D (a).
(2) Mixing the components 4 to 15 to prepare an oil phase (b).
(3) The components 16 to 22 were mixed to prepare an aqueous phase (c).
(4) Mixing the oil phase (b) with the D phase (a) a small amount and a plurality of times at normal temperature to prepare an O/D phase (e) of the gel-like emulsion.
(5) The aqueous phase (c) is mixed with the O/D phase (e) to prepare a cosmetic.
TABLE 1
1: trade name NIKKOL Decaglyn 1-L (solar chemical Co., ltd.)
2: trade name Sunsoft Q-14Y-C (Sun chemical Co., ltd.)
3: trade name MTX-05OTS (Tayca Co., ltd.)
4: trade name MZX-304OTS (Tayca Co., ltd.)
And 5: trade name MTY-110M3S (Tayca Co., ltd.)
And 6: trade name MZY-303S (Tayca Co., ltd.)
7: trade name SALACOS HS-6C (Riqing Oliyou group)
8: trade name NIKKKOL SI-15RV (Nicotine chemical Co., ltd.)
And 9: trade name KF-6017 (Xinyue chemical industry Co., ltd.)
10: trade name NIKKOL Decaglyn 3-OV (solar chemical Co., ltd.)
11: trade name EMALEX GWS-315 (Japanese emulsion Co., ltd.)
And (2) carrying out: trade name KF-6013 (Xinyue chemical industry Co., ltd.)
And (3) carrying out: trade name FLOCARERPSD 30 (SNF society)
From the results shown in table 1, the oil-in-water type sunscreen cosmetic of the present invention is excellent in the ease of extension, the feeling of tenderness, the feeling of blushing, and the storage stability (examples 1 to 3). On the other hand, the cosmetic containing no polyglycerin fatty acid ester having an HLB value of 5 to 8 as the component (D) in the oil phase (comparative example 1), the cosmetic using a polyoxyethylene fatty acid ester having an HLB value of 7 instead of the component (D) (comparative example 2), and the cosmetic obtained by blending polyglycerin-10 laurate having an HLB value of 15.5 even when the polyglycerin fatty acid ester is used in the preparation of the oil phase (comparative example 3) are unsatisfactory in terms of the ease of extension and the feeling of water tenderness. The cosmetics of comparative examples 4 and 5, in which the polyhydroxystearic acid of component (C) was replaced with sorbitan sesquiisostearate and PEG-10 polydimethylsiloxane as other dispersants, were also poor in terms of ease of extension and tender feeling, and could not satisfy viscosity stability. In addition, when titanium oxide subjected to hydrophobation by hydrogenated polydimethylsiloxane is used as the fine-particle inorganic powder, the titanium oxide is insufficient in terms of the ease of extension, the tender feeling and the pseudo-white feeling in addition to the problem of the emulsion stability (comparative example 6). When particulate zinc oxide was dispersed in the aqueous phase, the tenderness was poor and false white was severe (comparative example 7). When the proportion of the component (B) in the oil phase is low, the sense of water tenderness is poor (comparative example 8).
Example 4
< make-up spacer cream >)
Cosmetic base cream of the formula shown in Table 2 was prepared in the same manner as described above (D-phase emulsification method), and evaluated by the evaluation method described above. The results are shown in Table 2 together with the prescription. In addition, component numbers 6 to 9 in table 2 are pigments for dyeing.
TABLE 2
And (2) carrying out the following steps: trade name OTS-2 TiO2 PFC407 (Dadong chemical industry Co., ltd.)
15: trade name OTS-2 RED R-516P (Dadong chemical industry Co., ltd.)
And (3) carrying out: trade name OTS-2 YELLOW LL-100P (Dadong chemical industry Co., ltd.)
17: trade name OTS-2BLACK BL-100P (Dadong chemical industry Co., ltd.)
As is apparent from the results of table 2, the cosmetic base cream of example 4 is excellent in the ease of extension, the sense of moisture tenderness, the sense of blushing, and the storage stability.
[ possibility of industrial use ]
According to the present invention, there is provided a sunscreen cosmetic excellent in sunscreen effect, feel in use and storage stability.
Claims (6)
1. An oil-in-water type emulsified cosmetic, characterized by comprising, in proportion: an aqueous polymer (A) containing 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof as a structural unit, an ultraviolet scattering agent (B) comprising an inorganic powder which has been subjected to a hydrophobization treatment with a trialkoxyalkylsilane in an amount of 10 to 40% by mass, a polyhydroxystearic acid (C) in an amount of 0.1 to 5% by mass, a polyglycerin fatty acid ester (D) having an HLB value of 5 to 8 in an amount of 0.1 to 5% by mass, a liquid oil (E) in an amount of 7 to 40% by mass, and water (F) in an amount of 30 to 80% by mass, wherein the oil-in-water emulsion cosmetic is an emulsion in which an oil phase containing each of the components (B) to (E) is dispersed in an aqueous phase containing the components (A) and (F), and the content of the component (B) in the oil phase is 40 to 70% by mass.
2. The oil-in-water type emulsified cosmetic according to claim 1, wherein,
the oil phase content is 20-70 mass% and the water phase content is 30-80 mass%.
3. The oil-in-water type emulsified cosmetic according to claim 1 or 2, wherein,
substantially no organic ultraviolet absorber is included.
4. The oil-in-water type emulsion cosmetic according to any one of claim 1 to 3, wherein,
also comprises (G) a hydrophilic surfactant.
5. The oil-in-water type emulsion cosmetic according to any one of claims 1 to 4, wherein,
and (H) a polyol.
6. The oil-in-water type emulsion cosmetic according to any one of claims 1 to 5, wherein,
(E) The liquid oil contains ester oil.
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| JP2021070045A JP2022164505A (en) | 2021-04-17 | 2021-04-17 | Oil-in-water type emulsion cosmetic |
| PCT/JP2022/013804 WO2022220047A1 (en) | 2021-04-17 | 2022-03-24 | Oil-in-water emulsion cosmetic composition |
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| JP2016074660A (en) * | 2014-10-08 | 2016-05-12 | 堺化学工業株式会社 | Oil-in-water emulsion cosmetic and production method thereof |
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| CN109512684B (en) * | 2018-12-29 | 2021-09-07 | 浙江大学华南工业技术研究院 | Sunscreen agent with high content of titanium dioxide or zinc oxide and preparation method thereof |
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