Sunscreen cosmetic, method for improving UV protection index of UV absorber, and UV protection index improver

Abstract

One embodiment of the sunscreen cosmetic according to the present invention is an oil-in-water type or water-in-oil type sunscreen cosmetic in which the aqueous phase contains (A) a dispersion of an ultraviolet absorber and (B) a non-electrolyte associative aqueous thickener, the mass ratio [(A) / (B)] of the content of the dispersion of the ultraviolet absorber (A) to the content of the non-electrolyte associative aqueous thickener (B) in the aqueous phase is 1-3.

Description

Technical Field

[0001] The present invention relates to a sunscreen cosmetic, a method for improving the ultraviolet protection index of an ultraviolet absorber, and an ultraviolet protection index improver. Background Art

[0002] Protecting the skin from damage by ultraviolet rays is one of the important issues in skin care and body care. In order to minimize the adverse effects of ultraviolet rays on the skin, various UV care cosmetics have been developed. As a type of UV care cosmetic, a sunscreen cosmetic (sunscreen cosmetic) prevents the skin from reaching the UVA region (320 nm to 400 nm) and the UVB region (280 nm to 320 nm) by incorporating an ultraviolet absorber and an ultraviolet scattering agent, thereby protecting the skin from damage by ultraviolet rays. Therefore, in outdoor activities such as swimming pools in summer, beach bathing, and skiing in winter, UV care cosmetics that have an ultraviolet protection effect even under severe ultraviolet conditions are still expected.

[0003] As an ultraviolet protection agent incorporated in a sunscreen cosmetic, ultraviolet scattering agent particles are mainly used. These ultraviolet scattering agent particles are usually incorporated by being dispersed in an oily medium according to their physical properties. On the other hand, in order to obtain a high ultraviolet protection index (SPF: Sun Protection Factor), it is necessary to incorporate a large amount of ultraviolet scattering agent particles by dispersing them in an oily medium. However, for this reason, the amount of the oily medium to be incorporated also needs to be increased. Such a sunscreen cosmetic is greasy and sticky when used, and especially during the period of strong sunlight centered on summer, it feels very bad when used, and there is a problem that users do not want to use it.

[0004] As an emulsified cosmetic that maintains the dispersed state of fine particle metal oxides as an ultraviolet protection agent and improves the ultraviolet protection effect of the preparation, for example, a formulation has been proposed in which fine particle metal oxides, (acrylate / ethylhexyl acrylate / polydimethylsiloxane methacrylate) copolymer, a film-forming agent having a silicone chain as a main skeleton, and a silicone surfactant are incorporated (see Patent Document 1).

[0005] However, the ultraviolet protection effect of the proposed emulsified cosmetic is not satisfactory, and it feels sticky when applied, and a moist feeling cannot be obtained when further applied.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-75920 Summary of the Invention

[0009] Problems to be Solved by the Invention

[0010] In view of the above, an object of one aspect of the present invention is to provide a sunscreen cosmetic having a high ultraviolet protection effect, not sticky during coating, and excellent water moist feeling during coating.

[0011] Method for solving the problem

[0012] In order to solve the above problems, one aspect of the sunscreen cosmetic according to the present invention is an oil-in-water type or water-in-oil type sunscreen cosmetic, the aqueous phase contains a dispersion of (A) an ultraviolet absorber and (B) a non-electrolyte associative aqueous thickener, and the mass ratio [(A) / (B)] of the content of the dispersion of the (A) ultraviolet absorber to the content of the (B) non-electrolyte associative aqueous thickener in the above aqueous phase is 1 to 3.

[0013] Effect of the invention

[0014] According to one aspect of the present invention, it is possible to provide a sunscreen cosmetic having a high ultraviolet protection effect, not sticky during coating, and excellent water moist feeling during coating. Description of the drawings

[0015] Figure 1A It is a graph showing the absorbance results when methylene bis-benzotriazolyl tetramethylbutylphenol as an ultraviolet absorber is incorporated into the aqueous phase in combination with various thickeners in Test Example 1. The horizontal axis represents the wavelength (nm), and the vertical axis represents the absorbance (Abs).

[0016] Figure 1B It is a graph showing the absorbance results when bis-ethylhexyloxyphenol methoxyphenyl triazine as an ultraviolet absorber is incorporated into the aqueous phase in combination with various thickeners in Test Example 1. The horizontal axis represents the wavelength (nm), and the vertical axis represents the absorbance (Abs).

[0017] Figure 2 It is a graph showing the absorbance results when methylene bis-benzotriazolyl tetramethylbutylphenol as an ultraviolet absorber is incorporated into the aqueous phase in combination with (PEG-240 / decyldodeceth-20 / HDI) copolymer or polyurethane-59 as a non-electrolyte associative thickener in Test Example 2. The horizontal axis represents the wavelength (nm), and the vertical axis represents the absorbance (Abs). Detailed description of the invention

[0018] Hereinafter, the embodiments of the present invention will be described in detail. In addition, the embodiments are not limited by the following description, and can be appropriately changed within the scope not departing from the gist of the present invention. In addition, in this specification, "~" indicating a numerical range includes the numerical values described before and after it as the lower limit value and the upper limit value unless otherwise specified.

[0019] (Sunscreen cosmetic)

[0020] A sunscreen cosmetic according to one embodiment is an oil-in-water type or water-in-oil type sunscreen cosmetic. The aqueous phase contains a dispersion of (A) an ultraviolet absorber and (B) an associative aqueous thickener that is a non-electrolyte. The mass ratio [(A) / (B)] of the content of the dispersion of the above-mentioned (A) ultraviolet absorber to the content of the above-mentioned (B) associative aqueous thickener in the above-mentioned aqueous phase is 1 to 3.

[0021] The present inventors have conducted in-depth research and found that by incorporating the ultraviolet absorber as the above-mentioned (A) component as a dispersion in the aqueous phase, and further incorporating the associative aqueous thickener as the (B) component in a specific amount in the aqueous phase, the dispersibility of the above-mentioned (A) component can be improved, and a high ultraviolet protection effect that cannot be predicted from the amount of the above-mentioned (A) component can be obtained. Furthermore, it has been found that the sunscreen cosmetic according to one embodiment does not feel sticky during application, and a moist feeling can be felt during application, and the usability is also excellent. Therefore, the sunscreen cosmetic according to one embodiment has a high ultraviolet protection effect from the UVA region to the UVB region, and particularly has a high ultraviolet protection effect on the UVB region.

[0022] In addition, the sunscreen cosmetic according to one embodiment incorporates the ultraviolet absorber as the above-mentioned (A) component as a dispersion in the aqueous phase, and further incorporates the associative aqueous thickener as the (B) component in a specific amount in the aqueous phase, so that even for either an oil-in-water type or a water-in-oil type formulation, a sunscreen cosmetic with a high ultraviolet protection effect, no stickiness during application, and excellent moist feeling during application can be produced. Therefore, the present invention includes "oil-in-water type sunscreen cosmetics" and "water-in-oil type sunscreen cosmetics".

[0023] In addition, in this specification, a high ultraviolet protection effect that cannot be predicted from the amount of the original ultraviolet absorber is sometimes referred to as an "enhancement effect". The enhancement effect of the sunscreen cosmetic according to one embodiment can be confirmed by comparing the absorbance of a sunscreen cosmetic when only the dispersion of the ultraviolet absorber as the above-mentioned (A) component is incorporated with the absorbance of a sunscreen cosmetic when the mass ratio [(A) / (B)] of the dispersion of the ultraviolet absorber as the above-mentioned (A) component and the associative aqueous thickener as the above-mentioned (B) non-electrolyte is made 1 to 3. Specifically, if the absorbance of a sunscreen cosmetic when the mass ratio [(A) / (B)] of the dispersion of the ultraviolet absorber as the above-mentioned (A) component and the associative aqueous thickener as the above-mentioned (B) non-electrolyte is made 1 to 3 is increased compared to the absorbance of a sunscreen cosmetic when only the dispersion of the ultraviolet absorber as the above-mentioned (A) component is incorporated, it can be explained that there is an enhancement effect.

[0024] In a sunscreen cosmetic according to an embodiment, in addition to the above-mentioned components (A) and (B), further, preferably, a component (C) ultraviolet absorber is contained in the above-mentioned oil phase, and other components may be contained as needed.

[0025] <Aqueous phase>

[0026] The above-mentioned aqueous phase contains a dispersion of the above-mentioned component (A) ultraviolet absorber and the above-mentioned component (B) non-electrolyte associative water-soluble thickener, further preferably contains water, and other components may be contained as needed.

[0027] <<Dispersion of component (A) ultraviolet absorber>>

[0028] The dispersion of the ultraviolet absorber as the above-mentioned component (A) is mainly incorporated to impart an ultraviolet protection effect to the sunscreen cosmetic according to an embodiment. In addition, it is important that the ultraviolet absorber of the above-mentioned component (A) exists as a dispersion in the above-mentioned aqueous phase, and the ultraviolet absorber dissolved in the above-mentioned aqueous phase is not included in the above-mentioned component (A).

[0029] The ultraviolet absorber as the raw material of the dispersion of the ultraviolet absorber as the above-mentioned component (A) is not particularly limited as long as it is an ultraviolet absorber capable of forming a dispersion in the above-mentioned aqueous phase, and can be appropriately selected according to the purpose. It is preferably selected from ultraviolet absorbers that are insoluble in water and poorly soluble or insoluble in oil.

[0030] Examples of the ultraviolet absorber that is insoluble in water and poorly soluble or insoluble in oil include triazine derivatives, phenylbenzotriazole derivatives, etc. They can be used alone or in combination of two or more.

[0031] Regarding the above-mentioned triazine derivatives, there is no particular limitation, and they can be appropriately selected according to the purpose. Preferably, it is bis-ethylhexyl oxy-phenol methoxy-phenyl triazine (2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-(1,3,5)-triazine) represented by the following structural formula (1), triphenyl triazine represented by the following structural formula (2), etc. These are ultraviolet absorbers that are insoluble in water and poorly soluble in oil.

[0032] [Chemical formula 1]

[0033]

[0034] [Chemical formula 2]

[0035]

[0036] As for the above-mentioned phenylbenzotriazole derivative, there is no particular limitation, and it can be appropriately selected according to the purpose. It is preferably methylenebisbenzotriazolyltetramethylbutylphenol (2,2'-methylenebis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol)) represented by the following structural formula (3). Methylenebisbenzotriazolyltetramethylbutylphenol is a UV absorber that is insoluble in water and insoluble in oil.

[0037] [Chemical formula 3]

[0038]

[0039] The above-mentioned UV absorber can be appropriately synthesized, and commercially available products can be used. As commercially available products of the above-mentioned UV absorber, for example, there can be mentioned products named Tinosorb (registered trademark) S (Tinosorb (registered trademark) S) (bis-ethylhexyloxyphenol methoxyphenyltriazine), Tinosorb (registered trademark) A2B (Tinosorb (registered trademark) A2B) (triphenyltriazine), Tinosorb (registered trademark) M (Tinosorb (registered trademark) M (methylenebisbenzotriazolyltetramethylbutylphenol) (the above, manufactured by BASF Japan Ltd.), etc.

[0040] In addition, when the UV absorber as the raw material of the dispersion of the UV absorber of the component (A) is a UV absorber that is insoluble in water and insoluble in oil, it is preferably incorporated into the above-mentioned aqueous phase as an aqueous dispersion of composite particles of the UV absorber and an organic polymer. By forming the above-mentioned composite particles, when the aqueous phase of the dispersion containing the UV absorber of the component (A) coexists with the above-mentioned oil phase, the elution of the oil-soluble UV absorber from the aqueous phase into the oil phase can be suppressed.

[0041] As a method for preparing the aqueous dispersion of the composite particles of the above-mentioned oil-soluble UV absorber and an organic polymer, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, it can be prepared according to the method described in International Publication No. 2009 / 007264. Briefly, in a state where a mixture of a UV absorber and an organic monomer is dispersed in water, an aqueous dispersion of composite particles of the organic polymer obtained by emulsion polymerization of the above-mentioned UV absorber and the above-mentioned organic monomer can be obtained.

[0042] As for the above-mentioned organic monomer, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, monomers having an ethylenic unsaturated bond such as acrylic acid, methacrylic acid, alkyl acrylate, alkyl methacrylate, styrene monomer, and nylon monomer are preferred.

[0043] Aqueous dispersions of such composite particles can be appropriately prepared, for example, by known methods as described above, and commercially available products can also be used. Examples of commercially available products of the aqueous dispersion of the composite particles include Tinosorb (registered trademark) S aqua (Tinosorb (registered trademark) S aqua). Tinosorb (registered trademark) S aqua contains composite particles of bis-ethylhexyloxyphenol methoxyphenyl triazine and polymethyl methacrylate (PMMA) dispersed in water, with the content of bis-ethylhexyloxyphenol methoxyphenyl triazine being 20% by mass and the content of PMMA being 19% by mass.

[0044] There is no particular limitation on the particle size of the dispersion of the ultraviolet absorber as the component (A) in the aqueous phase, and it can be appropriately selected according to the purpose. The volume average particle size is preferably 500 nm or less, more preferably 200 nm or less. As the lower limit value of the particle size of the dispersion of the ultraviolet absorber as the component (A) in the aqueous phase, there is no particular limitation as long as the effects of the present invention are obtained.

[0045] The volume average particle size of the dispersion of the ultraviolet absorber as the component (A) can be measured, for example, using a laser diffraction-scattering type particle size distribution measuring device (e.g., MT3300EXII, manufactured by Micro Track Bell).

[0046] The content of the component (A) in the above sunscreen cosmetic is not particularly limited as long as it satisfies the above mass ratio [(A) / (B)], and it can be appropriately selected according to the purpose. With respect to the total mass of the sunscreen cosmetic, the solid component amount of the ultraviolet absorber is preferably 0.5% by mass to 6% by mass, more preferably 1.0% by mass to 4% by mass. If the content of the component (A) is 0.5% by mass or more, the ultraviolet protection effect can be improved, and if it is 6% by mass or less, the ultraviolet protection effect can be fully obtained.

[0047] <<(B) Non-electrolyte associative aqueous thickener>>

[0048] The non-electrolyte associative aqueous thickener as the component (B) is mainly incorporated to improve the ultraviolet protection effect of the component (A), and is preferably further incorporated to improve the hair viscosity during the application of the sunscreen cosmetic according to one embodiment and the moist feeling during the application.

[0049] The associative aqueous thickener of the component (B) above (hereinafter sometimes abbreviated as "associative aqueous thickener") is a water-soluble polymer having a hydrophilic group as a backbone and a hydrophobic group (associative group) in the side chain or at the end. More specifically, it is a copolymer having a hydrophilic part containing a water-soluble monomer and a hydrophobic part containing a hydrophobic monomer. In the aqueous solution of the component (B) above, the hydrophobic groups of the associative aqueous thickener associate with each other or with a substance having other hydrophobic groups to form crosslinks, thereby thickening the aqueous phase. In addition, since the component (B) above is a non-electrolyte, it has salt tolerance.

[0050] In this specification, "thickening" means imparting viscoelasticity to the above-mentioned sunscreen cosmetic, and "thickener" means a composition that is formulated in the sunscreen cosmetic for the purpose of imparting viscoelasticity to the above-mentioned sunscreen cosmetic.

[0051] In this specification, "salt tolerance" refers to the stability of viscosity when salts are contained in the sunscreen cosmetic according to one embodiment, and it is a property that the viscosity does not decrease immediately after formulation even if the sunscreen cosmetic according to one embodiment contains salts.

[0052] In this specification, "associative aqueous thickener" refers to an aqueous thickener that acts through an associative mechanism. In this field, it is considered that the associative mechanism is based on the structure of having independent hydrophilic and hydrophobic groups as the associative aqueous thickener polymer. The above-mentioned hydrophilic group imparts overall water solubility to the polymer molecule. The above-mentioned hydrophobic group associates with other hydrophobic groups on other thickener molecules to form a kinetic three-dimensional network structure of micelles containing hydrophobic groups. The association in this network structure is dynamic, but the interaction lifetime becomes sufficiently long according to the applied shear rate to provide viscosity to the system.

[0053] As disclosed in U.S. Patent No. 4,496,708, the "micellar crosslinking" theory is based on the existence of intermolecular micelle-like associations between hydrophobic groups bound to water-soluble polymers in an aqueous phase. In the broadest characterization, the term "micelle-like association" refers to the close association of at least two hydrophobic groups that exclude water. The longer the effective lifetime of the micelle-like association, the stronger the resulting network structure and the higher the observed viscosity, i.e., the better the thickening effect. The period during which each micelle-like association exists is related to the chemical potential of the hydrophobic group compared to the aqueous environment and steric factors, such as the proximity of other groups of one hydrophobic group (which aids the mutual approach of two or more hydrophobic groups). The chemical potential of the hydrophobic group compared to this aqueous environment is directly related to the solubility parameter of the hydrophobic group in water. If the hydrophobic group is hardly soluble in water, the driving force for micelle-like association is greater, resulting in a longer network structure lifetime and a higher observed viscosity. If the hydrophobic group is more soluble in water, the driving force for micelle-like association decreases, resulting in a shorter network structure lifetime and a lower observed viscosity.

[0054] In a sunscreen cosmetic according to one embodiment, the ultraviolet absorber of the above component (A) and the associative aqueous thickener of the non-electrolyte of the above component (B) form such a micelle-like association in the above aqueous phase. Thus, in the above aqueous phase, it is suitable to disperse the ultraviolet absorber of the above component (A), and a high ultraviolet protection effect is obtained.

[0055] The associative state in the above aqueous phase can be confirmed using a known apparatus for analyzing the associative state. As the apparatus for analyzing the associative state, for example, the apparatus described in Japanese Patent No. 6865972 can be cited.

[0056] The associative aqueous thickener as the above component (B) is not particularly limited and can be appropriately selected according to the purpose. It is preferably a hydrophobically modified polyether urethane, and more preferably a compound represented by the following general formula (1).

[0057] [Chemical formula 4]

[0058] R-B-(X-B) n -R General formula (1)

[0059] Among them, in the above general formula (1), R represents a hydrophobic moiety, X represents a hydrophilic moiety obtained by addition polymerization of an alkylene oxide containing ethylene oxide to an organic compound having at least two active hydrogen groups, B represents a bonding moiety containing an ether group or an ester group, and n represents an integer of 1 to 5.

[0060] As the associative aqueous thickener as the component (B) above, among these, a copolymer having a mass ratio of the hydrophilic part to the hydrophobic part [hydrophilic part: hydrophobic part] of 5:1 to 1,000:1 is preferred, a copolymer in which the hydrophilic part X is polyethylene oxide is more preferred, and a copolymer in which the hydrophobic part R is a monovalent hydrocarbon group having 6 or more carbon atoms or a monovalent fluorocarbon group having 4 or more carbon atoms, and the hydrophilic part of the copolymer is an ethylene oxide unit and polyethylene oxide having 30 to 6,000 (integer) is particularly preferred.

[0061] Among these, as the hydrophobic modified polyether urethane represented by the above general formula (1), a hydrophobic modified polyether urethane which is a (PEG-240 / decyldodeceth-20 / HDI) copolymer is particularly preferred.

[0062] The hydrophobic modified polyether urethane represented by the above general formula (1) can be appropriately synthesized and commercially available products can be used. As commercially available products of the hydrophobic modified polyether urethane represented by the above general formula (1), for example, there can be mentioned ADEKANOL GT-700 (trade name, (PEG-240 / decyldodeceth-20 / HDI) copolymer), ADEKA NOL GT-730 (trade name, (PEG-240 / decyldodeceth-20 / HDI) copolymer) (the above are manufactured by ADEKA CORPORATION), etc.

[0063] As another example of the above hydrophobic modified polyether urethane, there can be mentioned a urethane type polymer obtained by reacting a monohydroxy compound (I) represented by the following general formula (2A), a polyethylene glycol (II) represented by the following general formula (2B), a monoglyceryl ether compound (III) represented by the following general formula (2C), and an isocyanate compound (IV) represented by the following general formula (2D).

[0064] [Chemical formula 5]

[0065]

[0066] Among them, in the above general formula (2A), R 1 represents an aliphatic hydrocarbon group having 24 to 36 carbon atoms, and m represents an integer of 0 to 1,000.

[0067] [Chemical formula 6]

[0068]

[0069] Among them, in the above general formula (2B), n represents an integer of 2 to 1,000.

[0070] [Chemical formula 7]

[0071]

[0072] Among them, in the above general formula (2C), R 2 represents an aliphatic hydrocarbon group having 5 to 12 carbon atoms.

[0073] [Chemical formula 8]

[0074]

[0075] Among them, in the above general formula (2D), R 3 represents a hydrocarbon group having 4 to 13 carbon atoms, and q represents an integer of 2 or 3.

[0076] The above urethane-type polymer is obtained by reacting the above monohydroxy compound (I), the above polyethylene glycol (II), the above monoglyceryl ether compound (III), and the above isocyanate compound (IV). Specifically, the hydroxyl groups contained in the above monohydroxy compound (I), the above polyethylene glycol (II), and the above monoglyceryl ether compound (III) react with the isocyanate groups contained in the above isocyanate compound (IV). There are three kinds of compounds having hydroxyl groups, two of which are divalent, so the resulting urethane-type polymer has a complex structure and cannot be represented by an appropriate general formula.

[0077] As a method for producing the above urethane-type polymer, as long as the four compounds of the above monohydroxy compound (I), the above polyethylene glycol (II), the above monoglyceryl ether compound (III), and the above isocyanate compound (IV) react, there is no particular limitation. The respective compounds can be reacted together or separately. After the above isocyanate compound (IV) has completely reacted, even if any one of the above monohydroxy compound (I), the above polyethylene glycol (II), and the above monoglyceryl ether compound (III) is put into the reaction system without reacting, it is thus preferred to pre-mix the above monohydroxy compound (I), the above polyethylene glycol (II), and the above monoglyceryl ether compound (III), and add the above isocyanate compound (IV) thereto for reaction.

[0078] As reaction conditions in the method for producing the above urethane-type polymer, there is no particular limitation, and they can be appropriately selected according to the purpose. It is preferred to put the above monohydroxy compound (I), the above polyethylene glycol (II), and the above monoglyceryl ether compound (III) into the reaction system, carry out melt mixing at 40°C to 100°C, preferably 60 to 80°C, and while maintaining the same temperature, add the above isocyanate compound (IV) to the reaction system for reaction, and then, until the reaction is completed, cure it at the same temperature for 30 minutes to 3 hours.

[0079] In the production of the urethane polymer described above, the mixing ratios of the monohydroxy compound (I), the polyethylene glycol (II), the monoglyceryl ether compound (III), and the isocyanate compound (IV) are not particularly limited and can be appropriately selected according to the purpose. In order for the function as a thickener to be good and the reaction to be easily controlled, per 10 moles of the polyethylene glycol (II), preferably 10 to 30 moles of the monohydroxy compound (I), 5 to 20 moles of the monoglyceryl ether compound (III), and 20 to 50 moles of the isocyanate compound (IV); per 10 moles of the polyethylene glycol (II), more preferably 15 to 25 moles of the monohydroxy compound (I), 8 to 15 moles of the monoglyceryl ether compound (III), and 25 to 40 moles of the isocyanate compound (IV).

[0080] Details of the urethane polymer described above are described in Japanese Patent Publication No. 6159738, and in a sunscreen cosmetic according to an embodiment, reference can be made to them.

[0081] Among these, as the urethane polymer, preferably, the monohydroxy compound (I) is a polyethylene glycol ether of cetyl octadecanol (Tetradecylocta-100), the polyethylene glycol (II) is PEG-240, the monoglyceryl ether compound (III) is ethylhexylglycerin, and the isocyanate compound (IV) is a copolymer of 1,6-hexamethylene diisocyanate (HDI).

[0082] The urethane polymer can be appropriately synthesized by the above method, and commercially available products can also be used. Examples of commercially available products of the urethane polymer include ADEKA NOL GT-930 (Polyurethane-59, manufactured by ADEKA Corporation).

[0083] Regarding the content of the component (B), as long as the above mass ratio [(A) / (B)] range is satisfied, there is no particular limitation and it can be appropriately selected according to the purpose. Relative to the total mass of the sunscreen cosmetic, it is preferably 0.2% by mass to 3% by mass, and more preferably 1% by mass to 2% by mass. If the content of the component (B) is 0.2% by mass or more, the ultraviolet protection effect of the component (A) can be improved, and if it is 3% by mass or less, the hair viscosity during coating and the moist feeling during coating are good.

[0084] <<Mass ratio [(A) / (B)]>>

[0085] The mass ratio [(A) / (B)] of the content (mass) of the dispersion of the ultraviolet absorber as the above-mentioned component (A) to the content (mass%) of the associative water-soluble thickener of the non-electrolyte as the above-mentioned component (B) is 1 to 3, more preferably 2 to 3. If the above mass ratio [(A) / (B)] is less than 1, the ultraviolet protection effect brought by the ultraviolet absorber of the above-mentioned component (A) becomes insufficient. If it exceeds 3, stickiness occurs during coating, and the water-like feeling during coating also becomes insufficient.

[0086] <<Water>>

[0087] The above sunscreen cosmetic preferably contains the above water in the above aqueous phase. There is no particular limitation on the above water, and it can be appropriately selected according to the purpose. For example, pure water, high-purity water, tap water, well water, mineral water, mineral water, hot spring water, spring water, fresh water, purified water, hot water, ion-exchanged water, physiological saline, phosphate buffer, phosphate-buffered saline, etc. can be cited.

[0088] There is no particular limitation on the content of the above water, and it can be appropriately selected according to the dosage form of the sunscreen cosmetic according to one embodiment.

[0089] When the sunscreen cosmetic according to one embodiment is an oil-in-water type sunscreen cosmetic, there is no particular limitation on the content of the above water. Relative to the total mass of the above sunscreen cosmetic, it is preferably 50% by mass to 90% by mass, more preferably 60% by mass to 80% by mass. If the content of the above water in the above oil-in-water type sunscreen cosmetic is 50% by mass or more, the above-mentioned component (A) and the above-mentioned component (B) can be suitably contained. If it is 90% by mass or less, the ultraviolet absorber of the above-mentioned component (C) can be contained in the above oil phase, and the ultraviolet protection effect can be improved.

[0090] When the sunscreen cosmetic according to one embodiment is a water-in-oil type sunscreen cosmetic, there is no particular limitation on the content of the above water. Relative to the total mass of the above sunscreen cosmetic, it is preferably 10% by mass to 50% by mass, more preferably 10% by mass to 30% by mass. If the content of the above water in the above water-in-oil type sunscreen cosmetic is 10% by mass or more, the above-mentioned component (A) and the above-mentioned component (B) can be suitably contained. If it is 50% by mass or less, the ultraviolet absorber of the above-mentioned component (C) can be contained in the above oil phase, and the ultraviolet protection effect can be improved.

[0091] <Oil phase>

[0092] There is no particular limitation on the above oil phase, and it can be appropriately selected according to the purpose. It preferably contains (C) ultraviolet absorber and oil. Further, other components can be contained according to needs.

[0093] <<(C) Ultraviolet absorber>>

[0094] The ultraviolet absorber as the above-mentioned component (C) is incorporated mainly to further improve the ultraviolet protection effect of the sunscreen cosmetic according to one embodiment.

[0095] The ultraviolet absorber as the above-mentioned component (C) is not particularly limited and can be appropriately selected according to the purpose. An oil-soluble ultraviolet absorber that is soluble in the above-mentioned oil phase is preferred, and an ultraviolet absorber that synergistically absorbs ultraviolet rays with the dispersion of the ultraviolet absorber of the above-mentioned component (A) present in the above-mentioned aqueous phase is more preferred. In addition, as the ultraviolet absorber of the above-mentioned component (C), the same ultraviolet absorber as the raw material of the dispersion of the ultraviolet absorber of the above-mentioned component (A) incorporated in the above-mentioned aqueous phase can be used, or different ultraviolet absorbers can be used.

[0096] Examples of the ultraviolet absorber as the above-mentioned component (C) include methoxycinnamic acid derivatives, diphenylacrylic acid derivatives, salicylic acid derivatives, p-aminobenzoic acid derivatives, triazine derivatives, benzophenone derivatives, benzylmalonic acid ester derivatives, anthraquinone derivatives, imidazoline derivatives, 4,4-diarylbutadiene derivatives, phenylbenzotriazole derivatives, phenylbenzimidazole derivatives, etc. They can be used alone or in combination of two or more.

[0097] Specific examples of the ultraviolet absorber as the above-mentioned component (C) include ethylhexyl methoxycinnamate, homosalate, octyl salicylate, oxybenzone, 4-tert-butyl-4'-methoxydibenzoylmethane, octyl triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, 2-hydroxy-4-methoxybenzophenone, dihydroxy dimethoxybenzophenone, dihydroxybenzophenone, tetrahydroxybenzophenone, diethylamino hydroxybenzoyl benzoic acid hexyl ester, 2-cyano-3,3-diphenylacrylic acid 2'-ethylhexyl ester, silicone-15, cresol triazole polysiloxane, octocrylene, etc.

[0098] The content of the above-mentioned component (C) is not particularly limited and can be appropriately selected according to the purpose. Relative to the total mass of the above-mentioned sunscreen cosmetic, it is preferably 5% by mass to 20% by mass, more preferably 10% by mass to 16.5% by mass. If the content of the above-mentioned component (C) is 5% by mass or more, the ultraviolet protection effect of the sunscreen cosmetic according to one embodiment can be further improved. If it is 20% by mass or less, the hair viscosity during coating and the moist feeling during coating are further improved.

[0099] In addition, when the oil phase contains the ultraviolet absorber of the above component (C), the total content (mass %) of the dispersion of the ultraviolet absorber of the above component (A) in the above aqueous phase and the content (mass %) of the ultraviolet absorber of the above component (C) in the above oil phase in the sunscreen cosmetic according to one embodiment is not particularly limited and can be appropriately selected according to the purpose. Considering from the aspect of achieving a high SPF, it is preferably 13 mass % or more. Thus, the sunscreen cosmetic according to one embodiment can achieve a high SPF such as SPF 50 or more.

[0100] <<Oil component>>

[0101] The above oil component is not particularly limited and can be appropriately selected according to the purpose. For example, liquid oils and fats, ester oils, hydrocarbon oils, silicone oils, etc. can be mentioned. They can be used alone or in combination of two or more.

[0102] The above liquid oils and fats are not particularly limited and can be appropriately selected according to the purpose. For example, avocado oil, evening primrose oil, camellia oil, turtle oil, macadamia nut oil, sunflower oil, almond oil, corn bran oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, peach kernel oil, wheat germ oil, camellia flower oil, castor oil, linseed oil, safflower oil, cottonseed oil, daylily oil, soybean oil, peanut oil, tea seed oil, coconut oil, rice bran oil, white tung oil, Japanese tung oil, jojoba oil, germ oil, etc. can be mentioned.

[0103] The above ester oils are not particularly limited and can be appropriately selected according to the purpose. For example, cetyl octanoate, cetyl 2-ethylhexanoate, dimethyl octanoate hexyl decanoate, ethyl laurate, hexyl laurate, isopropyl myristate, 2-hexyldecyl myristate, myristyl myristate, octyldodecyl myristate, isopropyl palmitate, diisopropyl sebacate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-heptylundecyl palmitate, butyl stearate, isocetyl stearate, isocetyl isostearate, decyl oleate, dodecyl oleate, oleyl oleate, myristyl lactate, cetyl lactate, diisostearyl malate, cholesteryl 12-hydroxystearate, methyl ricinoleate, 2-ethylhexyl succinate, diisobutyl adipate, 2-hexyldecyl adipate, di-2-heptylundecyl adipate, diisopropyl sebacate, di-2-ethylhexyl sebacate, ethylene glycol di-2-ethylhexanoate, neopentyl glycol sebacate, neopentyl glycol dicaprylate, acetyl glyceride, glycerol di-2-heptylundecanoate, glycerol tricaprylate, glycerol tri-2-ethylhexanoate, glycerol trimyristate, glycerol tripalmitate, glycerol tri-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetracaprylate, pentaerythritol tetra-2-ethylhexanoate, etc. can be mentioned.

[0104] There is no particular limitation on the above hydrocarbon oil, and it can be appropriately selected according to the purpose. For example, liquid paraffin, squalene, pristane, polybutene, etc. can be cited.

[0105] There is no particular limitation on the above silicone oil, and it can be appropriately selected according to the purpose. For example, linear polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.; cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.; various modified polysiloxanes such as amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc. can be cited.

[0106] There is no particular limitation on the content of the above oil component, and it can be appropriately selected according to the dosage form of the sunscreen cosmetic according to one embodiment.

[0107] When the sunscreen cosmetic according to one embodiment is an oil-in-water type sunscreen cosmetic, there is no particular limitation on the content of the above oil component. Relative to the total mass of the above sunscreen cosmetic, it is preferably 1% by mass to 10% by mass, and more preferably 2% by mass to 5% by mass. If the content of the above oil component in the above oil-in-water type sunscreen cosmetic is 1% by mass or more, it can be suitably contained with the ultraviolet absorber of the above component (C), and if it is 10% by mass or less, the hair viscosity during coating is good.

[0108] When the sunscreen cosmetic according to one embodiment is a water-in-oil type sunscreen cosmetic, there is no particular limitation on the content of the above oil component. Relative to the total mass of the above sunscreen cosmetic, it is preferably 10% by mass to 50% by mass, and more preferably 20% by mass to 45% by mass. If the content of the above oil component in the above water-in-oil type sunscreen cosmetic is 10% by mass or more, it can be suitably contained with the ultraviolet absorber of the above component (C), and if it is 50% by mass or less, the hair viscosity during coating is good.

[0109] <<Other components>>

[0110] The sunscreen cosmetic according to one embodiment can contain various components generally used in cosmetics as long as the effects of the present invention are not impaired. As the above other components, for example, thickeners, pH adjusters, moisturizers, preservatives or antibacterial agents, antioxidants, medicaments, plant extracts, stabilizers, fragrances, pigments, chelating agents, powders, film-forming agents, etc. other than the above component (B) can be cited. One kind can be used alone, or two or more kinds can be used in combination.

[0111] -Thickener other than component (B)-

[0112] The thickener other than the above component (B) is preferably contained in the aqueous phase of the above sunscreen cosmetic.

[0113] As the thickener other than the above component (B), there is no particular limitation, and it can be appropriately selected according to the purpose. It is preferably a water-soluble polymer containing a structure derived from 2-acrylamido-2-methylpropanesulfonic acid (acryloyldimethyltaurine) (hereinafter sometimes referred to as "acryloyldimethyltaurine" or "AMPS").

[0114] As the water-soluble polymer containing the structural unit derived from the above AMPS, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, homopolymers of AMPS, copolymers containing the structural unit derived from AMPS, etc. can be cited. They can be used alone or in combination of two or more. Among these, copolymers containing the structural unit derived from AMPS are preferred.

[0115] As the copolymer containing the structural unit derived from the above AMPS, for example, (AMPS / acrylic acid) copolymer, (AMPS / acrylamide) copolymer, (AMPS / acrylic acid / acrylamide) copolymer, (AMPS / dimethylacrylamide) copolymer, (AMPS / 2-hydroxyethyl acrylate) copolymer, (AMPS / vinylpyrrolidone) copolymer, (AMPS / vinylformamide) copolymer, (AMPS / polyoxyethylene alkyl ester of methacrylic acid (average number of moles of ethylene oxide added: 4 or more and 30 or less, preferably 10 or more and 30 or less)) copolymer, or salts thereof, etc. can be cited.

[0116] As specific examples of the copolymer containing the structural unit derived from the above AMPS, (sodium acryloyldimethyltaurine / 2-hydroxyethyl acrylate) copolymer, (sodium acryloyldimethyltaurine / sodium acrylate) copolymer, (acryloyldimethyltaurine / sodium acrylate / dimethylacrylamide) crosslinked polymer, (ammonium acryloyldimethyltaurine / vinylpyrrolidone) copolymer, (sodium acryloyldimethyltaurine / acrylic acid / acrylamide / sodium acrylate) copolymer, (ammonium acryloyldimethyltaurine / dimethylacrylamide / lauryl methacrylate / polyoxyethylene lauryl ether-4) crosslinked polymer, (ammonium acryloyldimethyltaurine / polyoxyethylene behenyl ether-25 methacrylate) crosslinked polymer, (ammonium acryloyldimethyltaurine / polyoxyethylene stearyl ether-25 methacrylate) crosslinked polymer, etc. can be cited.

[0117] Among these, from the viewpoint of improving the ultraviolet protection effect, the copolymer containing the constituent unit derived from AMPS preferably further contains a constituent unit derived from an acrylic monomer such as acrylic acid, acrylamide, dimethylacrylamide, alkyl acrylate, alkyl methacrylate, hydroxyalkyl acrylate, and polyoxyethylene alkyl ester of methacrylic acid (average number of moles of ethylene oxide added: 4 or more and 30 or less, preferably 10 or more and 30 or less) in addition to the constituent unit derived from AMPS, as other monomers other than AMPS. The acrylic monomer can be used alone or in combination of two or more kinds.

[0118] The water-soluble polymer containing the constituent unit derived from AMPS can be appropriately synthesized or commercially available products can be used. Examples of commercially available products of the water-soluble polymer containing the constituent unit derived from AMPS include SIMULGEL EG [(sodium acryloyldimethyltaurate / sodium acrylate) copolymer, isododecane, Polysorbate 80], SEPIMAX ZEN [(ammonium acryloyldimethyltaurate / dimethylacrylamide / lauryl methacrylate / polyoxyethylene (4) lauryl methacrylate) crosslinked polymer], SEPINOV EMT 10 [(sodium acryloyldimethyltaurate / 2-hydroxyethyl acrylate) copolymer], SIMULGEL NS [(sodium acryloyldimethyltaurate / 2-hydroxyethyl acrylate) copolymer, squalene, Polysorbate 60, water], SIMULGEL FL [(sodium acryloyldimethyltaurate / 2-hydroxyethyl acrylate) copolymer, isododecane, Polysorbate 60, water], SEPIPLUS S [(sodium acryloyldimethyltaurate / 2-hydroxyethyl acrylate) copolymer, polyisobutene, PEG-7 trimethylolpropane cocoate, water], SEPIPLUS 400 [(sodium acryloyldimethyltaurate / acrylic acid / acrylamide / sodium acrylate) copolymer, polyisobutene, Polysorbate 20, water] (above, manufactured by SEPPIC); Aristoflex (Aristoflex) (registered trademark) AVC [(ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer], Aristoflex (Aristoflex) (registered trademark) HMB [(ammonium acryloyldimethyltaurate / polyoxyethylene (25) behenyl methacrylate) crosslinked polymer], Aristoflex (Aristoflex) (registered trademark) HMS [(ammonium acryloyldimethyltaurate / polyoxyethylene (25) stearyl methacrylate) crosslinked polymer] (above, manufactured by Clariant), etc.

[0119] Among these, the water-soluble polymers containing the above-mentioned constituent units derived from AMPS are preferably (ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer and (ammonium acryloyldimethyltaurate / polyoxyethylene behenyl ether-25 methacrylate) cross-linked polymer in terms of water wettability and high thickening effect.

[0120] The content of the thickener other than the above component (B) is not particularly limited as long as the effects of the present invention are not impaired, and can be appropriately selected according to the purpose. It is preferably 0.1% by mass to 0.5% by mass based on the total mass of the above sunscreen cosmetic.

[0121] The content of the above-mentioned lower alcohol is not particularly limited and can be appropriately selected according to the purpose.

[0122] -pH adjuster-

[0123] The above pH adjuster is preferably contained in the water phase of the above sunscreen cosmetic. The above pH adjuster is not particularly limited and can be appropriately selected according to the purpose. For example, acidic agents such as lactic acid, citric acid, sodium citrate, glycolic acid, succinic acid, tartaric acid, malic acid, hydrochloric acid, and phosphoric acid; basic agents such as sodium hydroxide, potassium hydroxide, triethanolamine, sodium bicarbonate, ammonium bicarbonate, triisopropanolamine, and monoethanolamine, etc. can be cited. They can be used alone or in combination of two or more.

[0124] The content of the above pH adjuster is not particularly limited as long as the above sunscreen cosmetic can be adjusted to the desired pH, and can be appropriately selected according to the purpose.

[0125] -Humectant-

[0126] The above humectant can be contained in either the water phase or the oil phase of the above sunscreen cosmetic according to its physical properties, and is preferably contained in the water phase of the above sunscreen cosmetic.

[0127] The above humectant is not particularly limited and can be appropriately selected according to the purpose. For example, polyhydric alcohols such as glycerin, diethylene glycol, 1,3-butanediol, polyethylene glycol, and dipropylene glycol; proteins such as amino acids, nucleic acids, collagen, and elastin; mucopolysaccharides such as hyaluronic acid and chondroitin sulfate, etc. can be cited. They can be used alone or in combination of two or more.

[0128] The content of the above humectant in the above sunscreen cosmetic is not particularly limited and can be appropriately selected according to the purpose.

[0129] -Preservative or antibacterial agent-

[0130] The above-mentioned preservative or the above-mentioned antibacterial agent may be contained in either the aqueous phase or the oil phase of the above-mentioned sunscreen cosmetic according to its physical properties, and is preferably contained in the aqueous phase of the above-mentioned sunscreen cosmetic.

[0131] There is no particular limitation on the above-mentioned preservative or the above-mentioned antibacterial agent, and it can be appropriately selected according to the purpose. For example, examples thereof include parabens, ethanol, phenoxyethanol, octyldodecanol, benzoic acid, salicylic acid, phenol, sorbic acid, parachlorometacresol, hexachlorophene, benzalkonium chloride, chlorhexidine gluconate, triclocarban, and phthalocyanine dyes. They can be used alone or in combination of two or more.

[0132] There is no particular limitation on the content of the above-mentioned preservative or the above-mentioned antibacterial agent in the above-mentioned sunscreen cosmetic, and it can be appropriately selected according to the purpose.

[0133] -Antioxidant-

[0134] The above-mentioned antioxidant may be contained in either the aqueous phase or the oil phase of the above-mentioned sunscreen cosmetic according to its physical properties.

[0135] There is no particular limitation on the above-mentioned antioxidant, and it can be appropriately selected according to the purpose. For example, examples thereof include ascorbic acid, α-tocopherol, dibutylhydroxytoluene, and butylated hydroxyanisole. They can be used alone or in combination of two or more.

[0136] There is no particular limitation on the content of the above-mentioned antioxidant in the above-mentioned sunscreen cosmetic, and it can be appropriately selected according to the purpose.

[0137] -Powder-

[0138] The above-mentioned powder may be contained in either the aqueous phase or the oil phase of the above-mentioned sunscreen cosmetic according to its physical properties, and is preferably contained in the oil phase.

[0139] There is no particular limitation on the above-mentioned powder as long as it can be generally formulated in cosmetics and topical skin preparations, and it can be appropriately selected according to the purpose. Hydrophobic powders have strong water repellency, so they are strong against water and sweat, and are preferred in terms of improving SPF and coverage.

[0140] As the above-mentioned hydrophobic powder, the powder itself may be a hydrophobic powder, or even if it is a hydrophilic powder or the like, it may be a hydrophobized powder obtained by hydrophobizing the surface of the raw material powder.

[0141] The above-mentioned hydrophobic powder, which is hydrophobic as a powder itself, is not particularly limited and can be appropriately selected according to the purpose. For example, organic powders such as polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, copolymer resin powder of styrene and acrylic acid, benzoguanamine resin powder, polytetrafluoroethylene powder, and cellulose powder can be cited; silicone powders such as trimethylsilsesquioxane powder can also be cited.

[0142] The raw material powder for the above-mentioned hydrophobized powder is not particularly limited and can be appropriately selected according to the purpose. For example, inorganic powders such as talc, kaolin, mica, mica, sericite (phlogopite), muscovite, phlogopite, synthetic mica, red mica, biotite, lepidolite, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, metal tungstate, zinc oxide, magnesium, silicon dioxide, zeolite, barium sulfate, calcined calcium sulfate (gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soaps (such as zinc myristate, calcium palmitate, aluminum stearate, etc.), and boron nitride can be cited; inorganic white pigments such as titanium dioxide and zinc oxide; inorganic red pigments such as iron oxide (iron oxide red) and iron titanate; inorganic brown pigments such as γ-iron oxide; inorganic yellow pigments such as yellow iron oxide and loess; inorganic black pigments such as black iron oxide, carbon black, and low-valent titanium dioxide; inorganic purple pigments such as manganese violet and Baltic purple; inorganic green pigments such as chromium oxide, chromium hydroxide, and cobalt titanate; inorganic blue pigments such as ultramarine and navy blue; pearlescent pigments such as mica titania, iron oxide-coated mica titania, carmine-coated mica titania, carmine-iron blue-coated mica titania, iron oxide-carmine-treated mica titania, iron blue-treated mica titania, iron oxide-iron blue-treated mica titania, chromium oxide-treated mica titania, black titanium oxide-treated mica titania, acrylic resin-coated aluminum powder, titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, bismuth oxychloride, and nacrite; metal powder pigments such as aluminum powder and copper powder can be cited.

[0143] The hydrophobization method of the raw material powder for the above-mentioned hydrophobized powder is not particularly limited as long as it can impart water repellency, and can be appropriately selected from known methods. For example, gas phase method, liquid phase method, autoclave method, mechanochemical method, etc. can be cited.

[0144] For example, when adding a hydrophobizing agent to the above raw material powder for treatment, it can be diluted and added in an appropriate solvent (such as dichloromethane, chloroform, hexane, ethanol, xylene, volatile silicone oil, etc.), or it can be added directly.

[0145] When mixing and stirring the above raw material powder and the above hydrophobizing agent, ball mills, pebble mills, vibration ball mills, ultrafine grinders, pot mills, rod mills, pan mills, homogeneous mixers, homogenizers, Henschel mixers, Nauta mixers, etc. can be used.

[0146] In addition, the following methods can also be used: a method in which, by utilizing the activity on the surface of the above raw material powder, cyclic organosiloxanes are polymerized on the powder surface at a low temperature of 100°C or lower through a gas-phase reaction (refer to Japanese Patent Publication No. Sho 63-54380); a method in which after the above method, side groups such as glycerol monoallyl ether are added to the Si-H part of the organosilicon polymer on the surface (refer to Japanese Patent Publication No. Sho 63-54381), etc.

[0147] The above hydrophobized powder is not particularly limited and can be appropriately selected according to the purpose. For example, fatty acid-treated powder, organosilicon-treated powder, amino acid-treated powder, metal soap-treated powder, ester oil-treated powder, phospholipid-treated powder, glycolipid-treated powder, etc. can be cited.

[0148] As the above fatty acid-treated powder, for example, fatty acid dextrin-treated powder, fatty acid soap-treated powder, etc. can be cited. As the above fatty acid, fatty acids having 12 or more carbon atoms are preferred. For example, stearic acid, lauric acid, etc. can be cited.

[0149] As the above organosilicon-treated powder, for example, silicone oil-treated powders such as methylhydrogenpolysiloxane, dimethylpolysiloxane (polydimethylsiloxane), methylphenylpolysiloxane, etc.; alkylsilanes such as methyltriethoxysilane, ethyltriethoxysilane, hexyltriethoxysilane, octyltriethoxysilane, etc.; fluoroalkylsilane-treated powders such as trifluoromethyl ethyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, etc.; tetramethyltetrahydrodiene cyclotetrasiloxane, trimethyltrihydrodiene cyclotrisiloxane, etc. described in Japanese Unexamined Patent Publication No. Sho 61-268763.

[0150] As the above amino acid-treated powder, for example, N-acylglutamate-treated powders such as dilauroylglutamic acid lysine salt, stearoylglutamate, etc., N-acyllysine salt-treated powders, etc. can be cited.

[0151] As the above metal soap-treated powder, for example, powders treated with stearic acid or its salts, powders treated with isostearic acid or its salts, etc. can be cited.

[0152] As the above ester oil-treated powder, for example, polyglyceryl-2 tetraisononanoate-treated powder, etc. can be cited.

[0153] As the above phospholipid-treated powder, for example, hydrogenated lecithin-treated powder, etc. can be cited.

[0154] As the above-mentioned glycolipid-treated powder, for example, there can be mentioned a treated powder using mannitol erythritol lipid as described in Japanese Patent No. 5639067 Gazette, etc.

[0155] These hydrophobic powders can be used alone in one kind, or two or more kinds can be used in combination. Among these, as the above-mentioned hydrophobic powder, a hydrophobized powder is preferred, and hydrophobized silica, hydrophobized mica, and hydrophobized zinc oxide are preferred.

[0156] The content of the above-mentioned hydrophobic powder is not particularly limited and can be appropriately selected according to the purpose. Relative to the total mass of the above-mentioned sunscreen cosmetic, it is preferably 1% by mass or more, more preferably 3% by mass or more. The upper limit value of the content of the above-mentioned hydrophobic powder is not particularly limited and can be appropriately selected according to the purpose. If the blending amount of the above-mentioned hydrophobic powder increases, the blending amount of the oil phase as the dispersion medium will necessarily increase, and the blending of other components will be restricted. Therefore, relative to the total mass of the above-mentioned sunscreen cosmetic, it is preferably 20% by mass or less, more preferably 10% by mass or less.

[0157] -Film-forming agent-

[0158] The above-mentioned film-forming agent can be contained in either the water phase or the oil phase of the above-mentioned sunscreen cosmetic according to its physical properties.

[0159] As the above-mentioned film-forming agent, as long as it is usually used in cosmetics, there is no particular limitation and it can be appropriately selected according to the purpose. For example, there can be mentioned polyvinylpyrrolidone (PVP)-based film-forming agents, acrylic-based film-forming agents, vinyl acetate-based film-forming agents, methacrylic acid-based film-forming agents, vinyl methyl ether-based skin film-forming agents, styrene-based film-forming agents, alkyd resin-based film-forming agents, etc. They can be used alone in one kind, or two or more kinds can be used in combination.

[0160] As the above-mentioned PVP-based film-forming agent, there is no particular limitation and it can be appropriately selected according to the purpose. For example, there can be mentioned polyvinylpyrrolidone (PVP), PVP / dimethylaminoethyl methacrylate copolymer, PVP / eicosene copolymer, PVP / ethyl methacrylate / methacrylic acid copolymer, PVP / hexadecene copolymer, PVP / VA copolymer, PVP / vinyl acetate / itaconic acid copolymer, styrene / PVP copolymer, etc.

[0161] As the above-mentioned acrylic film-forming agent, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, ethyl acrylate / acrylic amide / acrylic acid copolymer, ethyl acrylate / butyl acrylate copolymer, ethyl acrylate / ethyl methacrylate copolymer, ethyl acrylate / methacrylic acid copolymer, ethyl acrylate / methyl methacrylate copolymer, octyl acrylate / vinyl acetate copolymer, octyl acrylate / styrene copolymer, butyl acrylate / vinyl acetate copolymer, butyl acrylate / 2-hydroxyethyl methacrylate copolymer, butyl acrylate / methyl methacrylate copolymer, 2-methoxyethyl acrylate / 2-hydroxyethyl acrylate / butyl acrylate copolymer, lauryl acrylate / vinyl acetate copolymer, polyethyl acrylate, polybutyl acrylate, polystyrene acrylic resin, etc. can be cited.

[0162] As the above-mentioned vinyl acetate film-forming agent, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, polyvinyl acetate, etc. can be cited.

[0163] As the above-mentioned methacrylic film-forming agent, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, polymethyl methacrylate, methyl methacrylate / butyl acrylate / caprylic acid, vinyl pyrrolidone diethyl sulfate / N,N'-dimethylamino methacrylic acid copolymer, etc. can be cited.

[0164] As the above-mentioned vinyl methyl ether film-forming agent for skin, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, vinyl methyl ether / ethyl maleate copolymer, vinyl methyl ether / butyl maleate copolymer, etc. can be cited.

[0165] As the above-mentioned styrene film-forming agent, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, styrene / α-methylstyrene / indene copolymer, etc. can be cited.

[0166] As the above-mentioned alkyd resin film-forming agent, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, cyclohexane-based alkyd resin, etc. can be cited.

[0167] As the above-mentioned silicone resin film, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, trimethylsilyloxy silicic acid, etc. can be cited.

[0168] Regarding the content of the above-mentioned film-forming agent in the above-mentioned sunscreen cosmetics, there is no particular limitation, and it can be appropriately selected according to the purpose.

[0169] <<Manufacturing method>>

[0170] The manufacturing method of the sunscreen cosmetic according to an embodiment is not particularly limited and can be appropriately selected from commonly used methods during the manufacture of oil-in-water type cosmetics or water-in-oil type cosmetics. For example, a method can be cited where the components constituting the oil phase and the components constituting the water phase are each mixed to prepare each phase, and then the oil phase is added to the water phase for emulsification, etc.

[0171] The dosage form of the sunscreen cosmetic according to an embodiment is not particularly limited as long as it is an oil-in-water type or a water-in-oil type, and can be appropriately selected according to the purpose. For example, liquid form, semi-solid form, solid form, etc. can be cited. Among these, the liquid form is preferred.

[0172] The use of the sunscreen cosmetic according to an embodiment is not particularly limited. For example, it can be suitably used for makeup cosmetics such as foundation, eyeshadow, blush, lipstick, base cosmetics, skin care cosmetics, massage products, sunscreen care products, body care products, etc. The sunscreen cosmetic according to an embodiment has a high ultraviolet protection effect, does not get sticky when applied, and has excellent moisturizing feeling when applied. Therefore, among these, it is particularly suitable for sunscreen care products.

[0173] As the above-mentioned sunscreen care products, for example, sunscreen, sunscreen lotion, sunscreen lotion, lotion with sunscreen effect, etc. can be cited.

[0174] (Method for improving the sun protection factor of ultraviolet absorber)

[0175] The method for improving the sun protection factor (SPF) of the ultraviolet absorber according to an embodiment includes: a step of dispersing 1 part by mass of an ultraviolet absorber by blending 1 to 3 parts by mass of the ultraviolet absorber relative to 1 part by mass of a non-electrolyte associative aqueous thickener, and further including other steps as needed. Thus, the method for improving the sun protection factor of the ultraviolet absorber according to an embodiment obtains a high ultraviolet protection effect to an extent that cannot be predicted by the blending amount of the above-mentioned ultraviolet absorber, and can improve the sun protection factor. That is, the method for improving the sun protection factor of the ultraviolet absorber according to an embodiment is a method that utilizes the enhancing effect of the above-mentioned non-electrolyte associative aqueous thickener.

[0176] As the method for dispersing the above-mentioned ultraviolet absorber in the non-electrolyte associative aqueous thickener, there is no particular limitation, and it can be appropriately selected from known methods.

[0177] In the dispersion medium of the above-mentioned ultraviolet absorber, in addition to the non-electrolyte associative aqueous thickener, water is preferably included. As the above-mentioned water, there is no particular limitation, and the same water as the water in the sunscreen cosmetic according to an embodiment can be used.

[0178] (Sun protection factor improver)

[0179] An anti-ultraviolet index improver according to an embodiment is an anti-ultraviolet index improver used to improve the anti-ultraviolet index of an ultraviolet absorber. It contains a non-electrolyte associative water-based thickener as an active ingredient, and 1 to 3 parts by mass of the above ultraviolet absorber is dispersed per 1 part by mass of the non-electrolyte associative water-based thickener.

[0180] The non-electrolyte associative water-based thickener and the ultraviolet absorber contained in the anti-ultraviolet index improver according to an embodiment are the same as the substances contained in the sunscreen cosmetics according to an embodiment, so detailed description is omitted.

[0181] The anti-ultraviolet index improver according to an embodiment obtains a high anti-ultraviolet protection effect that cannot be predicted by the blending amount of the above ultraviolet absorber, thereby enabling the improvement of the anti-ultraviolet index. That is, the anti-ultraviolet index improver according to an embodiment utilizes the enhancing effect of the non-electrolyte associative water-based thickener as an active ingredient.

[0182] Examples

[0183] The following test examples, examples and comparative examples are listed to further specifically illustrate the embodiments, and the embodiments are not limited by these test examples, examples and comparative examples. In addition, in the test examples, examples and comparative examples, unless otherwise specified, the blending amount represents "mass%" relative to the total mass of the sunscreen cosmetics, and all are values converted to pure components. In addition, the mass ratio [(A) / (B)] of the content (mass%) of component (A) to the content (mass%) of component (B) is rounded off to the second decimal place and calculated to the first decimal place and recorded.

[0184] (Test Example 1)

[0185] Regarding the effect of the thickener on the ultraviolet absorber, the following method was used for testing.

[0186] <Preparation of test specimens>

[0187] Specifically, in the following basic formulation, as the ultraviolet absorber, the following (A-1) or the following (A-2) was used. In addition, as the thickener, the following (B-1), the following (B-2) or the following (B-3) was used. An oil-in-water type sunscreen cosmetic was manufactured by a conventional method and used as a test specimen.

[0188] [Basic formulation]

[0189] ·Ultraviolet absorber (*1) 1 mass%

[0190] ·Thickener (*2) 1 mass%

[0191] · Dipropylene glycol 8% by mass

[0192] · Nitroglycerin 2% by mass

[0193] · 1,3-Butanediol 4% by mass

[0194] · Diisopropyl sebacate 3% by mass

[0195] · Water 81% by mass

[0196] [UV absorber (*1)]

[0197] · (A-1) Methylene bis-benzotriazolyl tetramethylbutylphenol (Tinosorb® M, manufactured by BASF Japan Ltd.)

[0198] · (A-2) Bis-ethylhexyloxyphenol methoxyphenyl triazine (Tinosorb® S Lite Aqua, manufactured by BASF Japan Ltd.)

[0199] [Thickener (*2)]

[0200] · (B-1) (PEG-240 / Ceteth-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation): having salt tolerance and having a hydrophilic group and a hydrophobic group

[0201] · (B-2) (Ammonium acryloyldimethyltaurate / methacrylate polyoxyethylene behenyl ether-25) cross-linked polymer (Aristoflex® HMB, manufactured by Clariant): not having salt tolerance and having a hydrophilic group and a hydrophobic group

[0202] · (B-3) (Ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer (Aristoflex® AVC, manufactured by Clariant): not having salt tolerance and not having a hydrophilic group and a hydrophobic group <Measurement of absorbance>

[0203] Regarding the obtained test specimens, the absorbance in the wavelength range of 280 nm to 400 nm was measured according to the following method. Specifically, for the measurement plate (S plate) (a 5 cm × 5 cm V-groove PMMA plate, SPFMASTER-PA01), each test specimen was dropped in an amount of 2 mg / cm 2 and spread with a finger for 60 seconds. After drying for 15 minutes, the absorbance of the formed coating film was measured using a spectrophotometer (U-3500 type self-recording spectrophotometer, manufactured by Hitachi, Ltd.). The uncoated plate was used as a control, and the absorbance (Abs) at each wavelength was calculated based on the following formula (1).

[0204] Abs = -log(T / To) · · · Equation (1)

[0205] Among them, in the above Equation (1), "T" represents the transmittance of each sunscreen cosmetic, and "To" represents the transmittance without coating.

[0206] The relationship between each wavelength and absorbance in the case of using the above (A-1) as an ultraviolet absorber and using the above (B-1), the above (B-2), or the above (B-3) as a thickener is shown in Figure 1A . As a result, compared with the absorbance in the case of using the above (B-3) which has no salt tolerance and no hydrophilic group and hydrophobic group as a thickener, the absorbance is higher in the case of using the above (B-1) which has salt tolerance and has a hydrophilic group and a hydrophobic group, and in the case of using the above (B-2) which has no salt tolerance and has a hydrophilic group and a hydrophobic group. In addition, in the case of using the above (B-1), the absorbance in both the UVA region (320 nm to 400 nm) and the UVB region (280 nm to 320 nm) is high, but in the case of using the above (B-2), the absorbance in the UVA region is slightly worse.

[0207] Next, the relationship between each wavelength and absorbance in the case of using the above (A-2) as an ultraviolet absorber and using the above (B-1), the above (B-2), or the above (B-3) as a thickener is shown in Figure 1B . As a result, compared with the case of using the above (A-1) as an ultraviolet absorber, it can be seen that the absorbance in both the UVA region and the UVB region is further increased by the combination of the above (A-2) and the above (B-1).

[0208] From Figure 1A and Figure 2 the results of B, it can be seen that in the case of combining an ultraviolet absorber with a thickener having salt tolerance and having a hydrophilic group and a hydrophobic group, the strongest enhancement effect is obtained.

[0209] (Test Example 2)

[0210] Next, regarding the effect of the hydrophobic domain of the associative thickener on the ultraviolet absorber, the following method was used for testing.

[0211] <Preparation of Test Specimens>

[0212] In the basic formulation of Test Example 1, the following (A-1) was used as the ultraviolet absorber, and the following (B-1) or (B-4) polyurethane-59 (ADEKA NOL GT-930, manufactured by ADEKA Corporation) was used as the associative thickener. An oil-in-water type sunscreen cosmetic was manufactured by a conventional method and used as the test sample. In addition, the above (B-4) is a compound with a higher proportion in the hydrophobic region compared to the above (B-1).

[0213] <Determination of absorbance>

[0214] Regarding the obtained test sample, the absorbance in the wavelength range of 280 nm to 400 nm was measured using the same method as in Test Example 1.

[0215] The relationship between each wavelength and the absorbance is shown in Figure 2 . From the results, it can be seen that when the above (B-4) with a higher proportion in the hydrophobic region is used, the absorbance in the UVA region is further increased.

[0216] (Examples 1 to 3 and 8 to 11, and Comparative Examples 1 to 5 and 23 to 26)

[0217] The oil-in-water type sunscreen cosmetics of Examples 1 to 3 and 8 to 11, and Comparative Examples 1 to 5 and 23 to 26 were manufactured by a conventional method with the compositions and compounding amounts shown in Table 1 and Table 5 below.

[0218] Specifically, methylene bis-benzotriazolyl tetramethylbutylphenol (Tinosorb (registered trademark) M, manufactured by BASF Japan Ltd.) as the component (A), (PEG-240 / capric myristyl polyether-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation) or stearyloxy hydroxypropyl methylcellulose shown by the following general formula (3) (Sangelose 90L, manufactured by Daito Kasei Kogyo Co., Ltd.) as the component (B), an aqueous thickener, a humectant, a preservative, and water were heated and dissolved with the compounding amounts shown in Table 1 and Table 5 below to prepare an aqueous phase. In addition, the components of the oil phase including an oil component, a film-forming agent, and a powder were heated and dissolved with the compounding amounts shown in Table 1 and Table 5 below to prepare an oil phase. The oil phase was added to the above aqueous phase and emulsified by stirring treatment to prepare an oil-in-water type (OW) sunscreen cosmetic.

[0219] [Chemical formula 9]

[0220]

[0221] In the above general formula (3), R 1 , R 2 and R 3is a hydrophobic group and each independently represents -H, -CH3, -[CH2CH(CH3)O] m H, or -CH2CH(OH)CH2OR’, where R’ represents -C 18 H 37 , n represents an integer from 100 to 1,000, and m represents an integer from 1 to 5.

[0222] In addition, the succinoglycan (Leozan (registered trademark) SH, manufactured by Solvay & Asahi Kasei Co., Ltd.) used as the comparative component of the (B) component in Comparative Example 2 is an extracellular polysaccharide produced by a microorganism (Agrobacterium tumefaciens). As shown in the following structural formula (4), it has a repeating unit with side chains containing succinic acid and pyruvic acid and a main chain composed of a total of 8 sugar units of glucose and galactose. Succinoglycan has salt tolerance but is a non-associative thickener, and thickens by forming a network structure through hydrogen bonds between macromolecules.

[0223] [Chemical Formula 10]

[0224]

[0225] In Comparative Example 3, the (acrylate / alkyl acrylate (C10-30)) crosslinked polymer (PEMULEN TR-2, manufactured by Lubrizol) used as the comparative component of the (B) component is a compound obtained by crosslinking one or more monomers formed from acrylic acid, methacrylic acid, or their simple esters with an allyl ether of sucrose or an allyl ether of pentaerythritol. The (acrylate / alkyl acrylate (C10-30)) crosslinked polymer is associative but is a thickener without salt tolerance and thickens by electrostatic repulsion.

[0226] In Comparative Example 4, the carbomer (Carbopol (registered trademark) 980, manufactured by Lubrizol) used as the comparative component of the (B) component is a polymer of acrylic acid crosslinked with pentadiene allyl ether, sucrose allyl ether, or propylene allyl ether. Carbomer has no salt tolerance and is not an associative thickener, and thickens by electrostatic repulsion.

[0227] In Comparative Example 5, the (dimethylacrylamide / sodium acryloyldimethyltaurate) crosslinked polymer, which is an aqueous thickener used as a comparative component of the component (B), is a copolymer obtained by crosslinking dimethylacrylamide and sodium acryloyldimethyltaurate with methylenebisacrylamide. The (dimethylacrylamide / sodium acryloyldimethyltaurate) crosslinked polymer has low salt tolerance and is not an associative thickener, and thickens by the filling action of microgels.

[0228] (Examples 4 to 5 and Comparative Examples 6 to 10)

[0229] The oil-in-water type sunscreen cosmetics of Examples 4 to 5 and Comparative Examples 6 to 10 were produced by a conventional method with the compositions and compounding amounts shown in Table 2 below.

[0230] Specifically, the components of the aqueous phase containing, as the component (A), triphenyltriazine (Tinosorb (registered trademark) A2B, manufactured by BASF Japan Ltd.), as the component (B), a (PEG-240 / ceteth-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation) or stearyloxyhydroxypropylmethylcellulose (Sangelose 90L, manufactured by Daido Kasei Kogyo Co., Ltd.), an aqueous thickener, a humectant, a preservative, and water in the compounding amounts shown in Table 2 below were heated and dissolved to prepare an aqueous phase. In addition, the components of the oil phase containing an oil component, a film-forming agent, and a powder in the compounding amounts shown in Table 2 below were heated and dissolved to prepare an oil phase. The oil phase was added to the above aqueous phase and emulsified by stirring treatment to prepare an oil-in-water (OW) type sunscreen cosmetic.

[0231] (Examples 6 to 7 and Comparative Examples 11 to 15)

[0232] The oil-in-water type sunscreen cosmetics of Examples 6 to 7 and Comparative Examples 11 to 15 were produced by a conventional method with the compositions and compounding amounts shown in Table 3 below.

[0233] Specifically, each component of the aqueous phase containing bis-ethylhexyloxyphenol methoxyphenyl triazine (Tinosorb (registered trademark) S Lite Aqua, manufactured by BASF Japan Ltd.) as the component (A), (PEG-240 / decyldodeceth-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation) or stearyloxy hydroxypropyl methylcellulose (Sangelose 90L, manufactured by Daido Kasei Kogyo Co., Ltd.) as the component (B), an aqueous thickener, a humectant, a preservative, and water in the compounding amounts shown in Table 3 below is heated and dissolved to prepare an aqueous phase. In addition, each component of the oil phase containing an oil component, a film-forming agent, and a powder in the compounding amounts shown in Table 3 below is heated and dissolved to prepare an oil phase. The above oil phase is added to the above aqueous phase and emulsified by stirring treatment to prepare an oil-in-water (OW) sunscreen cosmetic.

[0234] (Comparative Examples 16 to 22)

[0235] The oil-in-water sunscreen cosmetics of Comparative Examples 16 to 22 are manufactured by a conventional method with the composition and compounding amounts shown in Table 4 below.

[0236] Specifically, each component of the aqueous phase containing terephthalylidene dicamphor sulfonic acid (Megizolil (registered trademark) SX, manufactured by L'Oréal Japan Co., Ltd.), a water-soluble ultraviolet absorber, as the comparative component of the component (A), (PEG-240 / decyldodeceth-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation) or stearyloxy hydroxypropyl methylcellulose (Sangelose 90L, manufactured by Daido Kasei Kogyo Co., Ltd.) as the component (B), an aqueous thickener, a humectant, a preservative, and water in the compounding amounts shown in Table 4 below is heated and dissolved to prepare an aqueous phase. In addition, each component of the oil phase containing an oil component, a film-forming agent, and a powder in the compounding amounts shown in Table 4 below is heated and dissolved to prepare an oil phase. The above oil phase is added to the above aqueous phase and emulsified by stirring treatment to prepare an oil-in-water (OW) sunscreen cosmetic.

[0237] (Examples 12 and 13)

[0238] The oil-in-water sunscreen cosmetics of Examples 12 and 13 are manufactured by a conventional method with the composition and compounding amounts shown in Table 6 below.

[0239] Specifically, the components of the aqueous phase containing methylene bis-benzotriazolyl tetramethylbutylphenol (Tinosorb® M, manufactured by BASF Japan Ltd.) and triphenyltriazine (Tinosorb® A2B, manufactured by BASF Japan Ltd.) as component (A), (PEG-240 / decyldodecanol polyether-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation) as component (B), an aqueous thickener, a humectant, a preservative, and water in the compounding amounts shown in Table 6 below are heated and dissolved to prepare an aqueous phase. Further, the components of the oil phase containing an ultraviolet absorber, an oil component, a film-forming agent, and a powder as component (C) in the compounding amounts shown in Table 6 below are heated and dissolved to prepare an oil phase. The above oil phase is added to the above aqueous phase and emulsified by stirring treatment to prepare an oil-in-water (OW) sunscreen cosmetic.

[0240] (Examples 14 and Comparative Examples 27 to 29)

[0241] The oil-in-water sunscreen cosmetics of Example 14 and Comparative Examples 27 to 29 are manufactured by a conventional method with the composition and compounding amounts shown in Table 7 below.

[0242] Specifically, the components of the aqueous phase containing methylene bis-benzotriazolyl tetramethylbutylphenol (Tinosorb® M, manufactured by BASF Japan Ltd.) as component (A), (PEG-240 / decyldodecanol polyether-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation) as component (B), an aqueous thickener, a humectant, a preservative, and water in the compounding amounts shown in Table 7 below are heated and dissolved to prepare an aqueous phase. Further, the components of the oil phase containing an ultraviolet absorber, an oil component, a film-forming agent, and a powder as component (C) in the compounding amounts shown in Table 7 below are heated and dissolved to prepare an oil phase. The above aqueous phase is added to the above oil phase and emulsified by stirring treatment to prepare an water-in-oil (WO) sunscreen cosmetic.

[0243] Further, the following substances are used as the ultraviolet absorber of component (C).

[0244] · Ethylhexyl methoxycinnamate (PARSOL® MCX, manufactured by DSM Corporation)

[0245] · Octocrylene (Uvinul® N539T, manufactured by BASF Japan Ltd.)

[0246] · Bis-ethylhexyloxyphenol methoxyphenyl triazine (Tinosorb® S, manufactured by BASF Japan Ltd.)

[0247] · Polyorganosiloxane-15 (PARSOL® SLX, manufactured by DSM Co., Ltd.)

[0248] · Diethylamino hydroxybenzoyl benzoic acid hexyl ester (Uvinul® A plus, manufactured by BASF Japan Ltd.)

[0249] (Examples 15 and Comparative Examples 30 to 31)

[0250] The water-in-oil type sunscreen cosmetics of Example 15 and Comparative Examples 30 to 31 were manufactured by a conventional method with the composition and compounding amounts shown in Table 7 below.

[0251] Specifically, each component of the aqueous phase containing triphenyltriazine (Tinosorb® A2B, manufactured by BASF Japan Ltd.) as the component (A), (PEG-240 / decyldodeceth-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation), an aqueous thickener, a humectant, a preservative, and water in the compounding amounts shown in Table 7 below was heated and dissolved to prepare an aqueous phase. In addition, each component of the oil phase containing an ultraviolet absorber, an oil component, a film-forming agent, and a powder as the component (C) in the compounding amounts shown in Table 7 below was heated and dissolved to prepare an oil phase. The aqueous phase was added to the above oil phase and emulsified by stirring treatment to prepare a water-in-oil type (WO) sunscreen cosmetic. (Examples 16 and Comparative Examples 32 to 33)

[0252] The water-in-oil type sunscreen cosmetics of Example 16 and Comparative Examples 32 to 33 were manufactured by a conventional method with the composition and compounding amounts shown in Table 8 below.

[0253] Specifically, each component of the aqueous phase containing bis-ethylhexyloxyphenol methoxyphenyl triazine (Tinosorb® S Lite Aqua, manufactured by BASF Japan Ltd.) as the component (A), (PEG-240 / decyldodeceth-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation), an aqueous thickener, a humectant, a preservative, and water in the compounding amounts shown in Table 8 below was heated and dissolved to prepare an aqueous phase. In addition, each component of the oil phase containing an ultraviolet absorber, an oil component, a film-forming agent, and a powder as the component (C) in the compounding amounts shown in Table 8 below was heated and dissolved to prepare an oil phase. The aqueous phase was added to the above oil phase and emulsified by stirring treatment to prepare a water-in-oil type (WO) sunscreen cosmetic.

[0254] (Comparative Examples 34 and 35)

[0255] Using the compositions and compounding amounts shown in Table 8 below, the water-in-oil sunscreen cosmetics of Comparative Examples 34 and 35 were manufactured by conventional methods.

[0256] Specifically, the components of the aqueous phase containing the water-soluble ultraviolet absorber phenylbenzimidazole sulfonic acid (Eusolex 232, manufactured by Merck KGaA) as the comparative component of component (A), the (PEG-240 / decyldodeceth-20 / HDI) copolymer (ADEKA NOL GT-700, manufactured by ADEKA Corporation) as component (B), a humectant, a preservative, and water in the compounding amounts shown in Table 8 below were heated and dissolved to prepare an aqueous phase. In addition, the components of the oil phase containing an ultraviolet absorber, an oil component, a film-forming agent, and a powder in the compounding amounts shown in Table 8 below were heated and dissolved to prepare an oil phase. The aqueous phase was added to the above oil phase and emulsified by stirring treatment to prepare a water-in-oil (WO) sunscreen cosmetic.

[0257] <Evaluation>

[0258] Regarding the oil-in-water sunscreen cosmetics of Examples 1 to 13 and Comparative Examples 1 to 26, and the water-in-oil sunscreen cosmetics of Examples 14 to 16 and Comparative Examples 27 to 35, the "ultraviolet protection effect", "moist feeling during application", and "stickiness during application" were evaluated by the following methods. The results are shown in Tables 1 to 8 below.

[0259] <<Ultraviolet Protection Effect>>

[0260] The ultraviolet protection effects of the oil-in-water sunscreen cosmetics of Examples 1 to 13 and Comparative Examples 1 to 26, and the water-in-oil sunscreen cosmetics of Examples 14 to 16 and Comparative Examples 27 to 35 were evaluated by measuring the absorbance.

[0261] Specifically, on a measurement plate (S plate) (a 5 cm × 5 cm V-groove PMMA plate, SPFMASTER-PA01), the sunscreen cosmetics of Examples 1 to 16 and Comparative Examples 1 to 25 were each dropped in an amount of 2 mg / cm 2 and spread with a finger for 60 seconds. After drying for 15 minutes, the absorbance of the formed film was measured using a spectrophotometer (U-3500 type self-recording spectrophotometer, manufactured by Hitachi, Ltd.). The uncoated plate was used as a control, and the absorbance (Abs) at 310 nm was calculated based on the following formula (1).

[0262] Abs = -log(T / To) · · · Formula (1)

[0263] Among them, in the above formula (1), "T" represents the transmittance of each sunscreen cosmetic, and "To" represents the transmittance without coating.

[0264] In addition, the ultraviolet absorbers of component (A) have different absorbances depending on the type. Therefore, the absorbances were compared in the examples and comparative examples using the same type of component (A). In the examples and comparative examples using the same type of component (A), when the absorbance is higher than that of the comparative example containing at least no component (B), it is judged as "having an ultraviolet protection effect".

[0265] <Moist feeling during coating>

[0266] Regarding the moist feeling when 10 professional judges applied 0.6 g of the oil-in-water sunscreen cosmetics of Examples 1 to 13 and Comparative Examples 1 to 26, and the water-in-oil sunscreen cosmetics of Examples 14 to 16 and Comparative Examples 27 to 35 on the wrists in a uniform manner, the evaluation was based on the following evaluation criteria. In addition, A is a level that can be used in practice.

[0267] - Evaluation criteria for moist feeling during coating -

[0268] A: More than 8 professional judges felt a moist feeling during coating

[0269] B: 3 or more and 7 or less professional judges felt a moist feeling during coating

[0270] C: 2 or less professional judges felt a moist feeling during coating <Stickiness during coating>

[0271] Regarding the stickiness when 10 professional judges applied 0.6 g of the oil-in-water sunscreen cosmetics of Examples 1 to 13 and Comparative Examples 1 to 26, and the water-in-oil sunscreen cosmetics of Examples 14 to 16 and Comparative Examples 27 to 35 on the wrists in a uniform manner, the evaluation was based on the following evaluation criteria. In addition, A is a level that can be used in practice.

[0272] - Evaluation criteria for moist feeling during coating -

[0273] A: More than 8 professional judges did not feel sticky during coating

[0274] B: 3 or more and 7 or less professional judges did not feel sticky during coating

[0275] C: 2 or less professional judges did not feel sticky during coating

[0276] [Table 1]

[0277]

[0278] [Table 2]

[0279]

[0280] [Table 3]

[0281]

[0282] [Table 4]

[0283]

[0284] [Table 5]

[0285]

[0286] [Table 6]

[0287]

[0288] [Table 7]

[0289]

[0290] [Table 8]

[0291]

[0292] From the results of Tables 1 to 3, it can be seen that in the oil-in-water type sunscreen cosmetics of Examples 1 to 7, the ultraviolet protection effect of the ultraviolet absorber of component (A) dispersed in the aqueous phase is enhanced due to component (B), having a high ultraviolet protection effect, not becoming sticky upon further coating, and having excellent usability such as excellent water moist feeling during coating. In contrast, from the results of Table 4, when the ultraviolet absorber is dissolved in the aqueous phase, even when the associative aqueous thickener of component (B) as a non-electrolyte is blended, no enhancement effect was confirmed. Further, from the results of Table 5, in order to achieve all the effects of having a high ultraviolet protection effect, not becoming sticky upon coating, and having excellent water moist feeling during coating, it is important that the mass ratio [(A) / (B)] is in the range of 1 to 3. Further, from the results of Table 6, in addition to component (A) in the aqueous phase, by blending an ultraviolet absorber as component (C) in the oil phase, the ultraviolet protection effect can be further improved and the usability is also excellent. In addition, from the results of Tables 7 and 8, as the dosage form of the sunscreen cosmetics according to one embodiment, not only the oil-in-water type, but also the water-in-oil type can achieve the same effect, and it was found that preparations of a large number of dosage forms can be manufactured.

[0293] As a mode of the present invention, for example, the following modes can be cited.

[0294] <1> A sunscreen cosmetic, characterized in that it is an oil-in-water type or water-in-oil type sunscreen cosmetic,

[0295] The aqueous phase contains a dispersion of (A) an ultraviolet absorber and (B) an associative aqueous thickener of a non-electrolyte.

[0296] The mass ratio [(A) / (B)] of the content of the dispersion of the above-mentioned (A) ultraviolet absorber to the content of the above-mentioned (B) associative aqueous thickener of a non-electrolyte in the above-mentioned aqueous phase is 1 to 3.

[0297] <2> The sunscreen cosmetic according to <1> above, wherein the above-mentioned (B) associative aqueous thickener of a non-electrolyte has a hydrophilic group and a hydrophobic group.

[0298] <3> The sunscreen cosmetic according to any one of <1> to <2> above, wherein the oil phase contains (C) an ultraviolet absorber.

[0299] The total content of the dispersion of the above-mentioned (A) ultraviolet absorber in the above-mentioned aqueous phase and the above-mentioned (C) ultraviolet absorber in the above-mentioned oil phase is 13% by mass or more.

[0300] <4> The sunscreen cosmetic according to any one of <1> to <3> above, which is in a liquid state.

[0301] <5> A method for improving the ultraviolet protection index of an ultraviolet absorber, characterized in that 1 to 3 parts by mass of the ultraviolet absorber is blended with respect to 1 part by mass of the associative aqueous thickener of a non-electrolyte to disperse it.

[0302] <6> An ultraviolet protection index improver, characterized in that it is an ultraviolet protection index improver used for improving the ultraviolet protection index of an ultraviolet absorber.

[0303] It contains an associative aqueous thickener of a non-electrolyte as an active ingredient.

[0304] It is formed by blending 1 to 3 parts by mass of the above-mentioned ultraviolet absorber with respect to 1 part by mass of the above-mentioned associative aqueous thickener of a non-electrolyte to disperse it.

[0305] As described above, the present invention has been described based on specific embodiments and examples, but these embodiments and examples are merely presented as examples, and the present invention is not limited by the above-mentioned embodiments and examples. The above-mentioned embodiments can be implemented in various other forms, and various combinations, omissions, substitutions, additions, changes, etc. can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the same scope as the invention described in the claims.

[0306] This international application claims priority based on Japanese Patent Application No. 2022-212688 filed on December 28, 2022, and the entire contents of Japanese Patent Application No. 2022-212688 are incorporated herein by reference.

Claims

1. A sunscreen cosmetic, characterized in that, it is an oil-in-water type or water-in-oil type sunscreen cosmetic, the aqueous phase contains a dispersion of (A) an ultraviolet absorber and (B) an associative aqueous thickener of a non-electrolyte, the mass ratio (A) / (B) of the content of the dispersion of the (A) ultraviolet absorber in the aqueous phase to the content of the (B) associative aqueous thickener of the non-electrolyte is 1 to 3.

2. The sunscreen cosmetic according to claim 1, the (B) associative aqueous thickener of the non-electrolyte has a hydrophilic group and a hydrophobic group.

3. The sunscreen cosmetic according to claim 1, the oil phase contains (C) an ultraviolet absorber, the total content of the dispersion of the (A) ultraviolet absorber in the aqueous phase and the (C) ultraviolet absorber in the oil phase is 13% by mass or more.

4. The sunscreen cosmetic according to claim 1, which is in liquid form.

5. A method for improving the ultraviolet protection index of an ultraviolet absorber, characterized in that, relative to 1 part by mass of the associative aqueous thickener of the non-electrolyte, 1 to 3 parts by mass of the ultraviolet absorber is blended to disperse it.

6. An ultraviolet protection index improver, characterized in that, it is an ultraviolet protection index improver used for improving the ultraviolet protection index of an ultraviolet absorber, it contains an associative aqueous thickener of a non-electrolyte as an active ingredient, and is formed by blending 1 to 3 parts by mass of the ultraviolet absorber relative to 1 part by mass of the associative aqueous thickener of the non-electrolyte to disperse it.

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