Oily composition

Abstract

To provide an oily composition having low viscosity under high shear rate and shear-shearing properties of high viscosity under low shear rate and having high recovery of elastic modulus after shear stress is applied.SOLUTION: There is provided an oily composition comprising the following components (A) to (C). A component (A): a nonionic water-insoluble polymer containing a constitutional unit derived from an alkyl (meth) acrylate having an alkyl group having 10 or more and 30 or less carbon atoms. A component (B): one or more oily components selected from the group consisting of a fatty acid having a hydroxy group having 10 or more and 30 or less carbon atoms, an alcohol having 10 or more and to 30 or less carbon atoms and an amide of a carboxylic acid having 10 or more and 30 or less carbon atoms, A component (C): an oily component other than the component (B).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an oily composition. [Background technology]

[0002] Compositions mainly composed of oily components are used as various topical compositions such as lipsticks, lip balms, other skin cosmetics, etc. Among them, solid topical compositions are required to have sufficient hardness to maintain the shape of a solid preparation, to be easily spread evenly on a target object, to be resistant to coming off after application to a target object, and to have excellent durability of effect.

[0003] In order to impart the above-mentioned properties to a topical composition, it is important to control the rheology of the composition. It is generally known to use a thickener or the like as a rheology control agent for the composition. As an example of a gel formulation containing a thickener, for example, Patent Document 1 discloses that a hydroalcoholic gel composition containing a C1-4 alcohol, an effective amount of a polyacrylate thickener, and an anti-clogging additive which is a specific polymer ester can reduce the occurrence of clogging of a dispenser nozzle. Patent Document 2 discloses that cosmetics or topical skin preparations containing hydroxycitric acid derivatives and / or salts thereof, as well as oily bases, thickening / gelling agents, etc. as effect enhancers for the hydroxycitric acid derivatives and / or salts of the hydroxycitric acid derivatives, have improved formulation performance such as efficacy and storage stability compared to the performance of hydroxycitric acids alone. Patent Document 3 discloses a thickener for non-aqueous systems, which contains a water-soluble polymer and a counter that ionically and / or electrostatically interacts with the water-soluble polymer, and a thickening composition containing the thickener, which has high transparency and is easy to use, even if the composition is mainly composed of a non-aqueous solvent. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2011-517310 [Patent Document 2] JP 2014-114291 A [Patent Document 3] International Publication No. 2019 / 44327 Summary of the Invention [Problem to be solved by the invention]

[0005] It is important that an external preparation composition that has sufficient hardness to maintain the shape of a solid preparation and is easy to spread evenly on an object has high viscosity at low shear rate, i.e., hardness, and shear thinning property that reduces viscosity at high shear rate. In addition, in order to make an external preparation composition that does not easily come off after application to an object, it is necessary for the composition to have a property (recovery of elastic modulus) that even if the elastic modulus decreases once after application of the composition, i.e., after application of shear stress, the elastic modulus quickly recovers. However, the techniques disclosed in Patent Documents 1 to 3 have not been able to realize an oil-based composition having the above-mentioned shear thinning property and elastic modulus recovery property.

[0006] The present invention relates to an oil-based composition that has shear-thinning properties, that is, high viscosity at low shear rates and low viscosity at high shear rates, and that has high elastic modulus recovery after the application of shear stress. [Means for solving the problem]

[0007] The present inventors have found that an oily composition containing a combination of a specific nonionic water-insoluble polymer and a specific oily component can solve the above problems. That is, the present invention relates to the following. [1] An oil-based composition containing the following components (A) to (C): Component (A): A nonionic water-insoluble polymer containing a structural unit derived from an alkyl (meth)acrylate having an alkyl group with 10 to 30 carbon atoms. Component (B): one or more oily components selected from the group consisting of fatty acids having 10 to 30 carbon atoms and a hydroxyl group, alcohols having 10 to 30 carbon atoms, and amides of carboxylic acids having 10 to 30 carbon atoms. Component (C): Oil-based components other than component (B) [2] An emulsion composition comprising the oily composition described in [1] above and water. [3] A cosmetic preparation containing the oily composition described in [1] above or the emulsion composition described in [2] above. Effect of the Invention

[0008] According to the present invention, an oily composition can be provided that has shear-thinning properties, that is, high viscosity at low shear rates and low viscosity at high shear rates, and has high elastic modulus recovery after shear stress is applied. When used as an external preparation, the oily composition has sufficient hardness to maintain the shape of a solid preparation, is easy to spread evenly on a target, is not easily removed after application to a target, and has excellent durability of effect. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Definition] In this specification, the term "oily composition" refers to a composition containing an oily component as a main component, and the oily component refers to a water-insoluble component. In this specification, "water-insoluble" means that the solubility in 100 g of water at 25°C is 0.1 g or less. In this specification, the term "a composition containing X and Y" includes a composition in which X and Y are combined. In this specification, "(meth)acrylic" includes acrylic and methacrylic.

[0010] In this specification, the term "nonionic polymer" refers to a polymer that does not substantially contain ionic groups such as cationic groups, anionic groups, and amphoteric groups. In this specification, the cationic group refers to a cationic group or a group that can be ionized to become a cationic group, and specific examples thereof include a primary amino group, a secondary amino group, a tertiary amino group, and a quaternary ammonium group. The anionic group is an anionic group or a group that can be ionized to become an anionic group, and specifically includes at least one selected from the group consisting of acidic groups such as a carboxy group, a sulfonic acid group, a phosphoric acid group, etc. In addition, anionic groups that are at least partially neutralized and in the form of a salt are also included in the anionic group. Furthermore, the amphoteric group may be a group containing a betaine structure.

[0011] [Oil-based composition] The oily composition of the present invention (hereinafter also simply referred to as "the composition of the present invention") contains the following components (A) to (C). Component (A): A nonionic water-insoluble polymer containing a structural unit derived from an alkyl (meth)acrylate having an alkyl group with 10 to 30 carbon atoms. Component (B): one or more oily components selected from the group consisting of fatty acids having 10 to 30 carbon atoms and a hydroxyl group, alcohols having 10 to 30 carbon atoms, and amides of carboxylic acids having 10 to 30 carbon atoms. Component (C): Oil-based components other than component (B) By virtue of having the above-mentioned configuration, the oil-based composition of the present invention has shear-thinning properties, i.e., high viscosity at low shear rates and low viscosity at high shear rates, and is an oil-based composition with high elastic modulus recovery after the application of shear stress. "Shear thinning" means that the difference between the viscosity at low shear rate and the viscosity at high shear rate is large. In the following, unless otherwise specified, in addition to the above, the term "shear thinning" simply refers to the fact that the viscosity is high at low shear rate and low at high shear rate. In addition, the recovery of the elastic modulus after the shear stress is applied is also simply referred to as "elastic modulus recovery".

[0012] The reason why the oily composition of the present invention exhibits the above-mentioned effects is not clear, but is thought to be as follows. It is believed that in the oil-based composition, component (A) acts as a high molecular weight gelling agent, and component (B) acts as a low molecular weight gelling agent. Component (A) is a nonionic water-insoluble polymer, and therefore has high affinity with the oil-based components (B) and (C), and effectively acts as a gelling agent in the oil-based composition. Component (B) can form a hard gel structure by entanglement of the crystal structures of the low molecular weight compounds. In addition, the gel structure is easily broken down when shear stress is applied, and exhibits the performance of being easily spread on the target object. On the other hand, the gel structure composed only of component (B) tends to have a hard elastic modulus that is difficult to recover after it is broken down by shear stress. In contrast, component (A) forms a gel structure by entanglement of polymer chains, and this gel structure is easy to recover even if it is broken by applying shear stress. The oil-based composition of the present invention has a composite gel structure containing the above-mentioned components (A) and (B), so it is considered that the oil-based composition of the present invention has a shear-thinning property that the viscosity is high at low shear rates and low at high shear rates, and can exhibit the property of high recovery of elastic modulus after applying shear stress. Component (C) dissolves components (A) and (B) and contributes to effectively exhibiting the shear thinning properties and elastic modulus recovery properties in the oil-based composition.

[0013] <Component (A): Nonionic water-insoluble polymer> The oil-based composition of the present invention contains, as component (A), a nonionic water-insoluble polymer containing a structural unit derived from an alkyl (meth)acrylate, the alkyl group of which has a carbon number of 10 to 30. Component (A) has the effect of improving the recovery of the elastic modulus after applying a shear stress to the oil-based composition.

[0014] The number of carbon atoms in the alkyl group of the alkyl (meth)acrylate is 10 or more, preferably 12 or more, more preferably 14 or more, even more preferably 16 or more, from the viewpoint of improving the water insolubility of component (A) and the shear thinning property and elastic modulus recovery property of the oil-based composition, and is 30 or less, preferably 28 or less, more preferably 26 or less, even more preferably 24 or less, and even more preferably 20 or less. The alkyl group of the alkyl (meth)acrylate may be either a straight-chain alkyl group or a branched-chain alkyl group. From the viewpoints of improving the water insolubility of component (A) and the shear-thinning property and elastic modulus recovery property of the oil-based composition, the straight-chain alkyl group is preferred.

[0015] Component (A) may also contain two or more types of structural units derived from alkyl (meth)acrylates in which the alkyl group has 10 or more and 30 or less carbon atoms. The alkyl (meth)acrylate may be any of alkyl acrylate, alkyl methacrylate, or a mixture thereof, but from the viewpoint of improving the shear thinning property and elastic modulus recovery property of the oily composition, it is preferable to contain alkyl acrylate. The content of the alkyl acrylate-derived structural unit in the alkyl (meth)acrylate-derived structural unit is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, and 100% by mass or less.

[0016] Specific examples of alkyl (meth)acrylates having an alkyl group with 10 to 30 carbon atoms include decyl (meth)acrylate, undecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, nonadecyl (meth)acrylate, and ethylhexyl (meth)acrylate. Examples of the acrylates include decyl, eicosyl (meth)acrylate, heneicosyl (meth)acrylate, behenyl (meth)acrylate, tricosyl (meth)acrylate, tetracosyl (meth)acrylate, pentacosyl (meth)acrylate, hexacosyl (meth)acrylate, heptacosyl (meth)acrylate, octacosyl (meth)acrylate, nonacosyl (meth)acrylate, and triacontyl (meth)acrylate. One or more of these may be used.

[0017] Among the above, from the viewpoint of improving the shear thinning property and elastic modulus recovery property of the oil-based composition, the alkyl (meth)acrylate is preferably one or more selected from the group consisting of lauryl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, nonadecyl (meth)acrylate, eicosyl (meth)acrylate, heneicosyl (meth)acrylate, behenyl (meth)acrylate, tricosyl (meth)acrylate, and tetracosyl (meth)acrylate, and more preferably lauryl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, nonadecyl (meth)acrylate, eicosyl (meth)acrylate, heneicosyl (meth)acrylate, behenyl (meth)acrylate, tricosyl (meth)acrylate, and tetracosyl (meth)acrylate. The acrylate is preferably one or more selected from the group consisting of tetradecyl (meth)acrylate, hexadecyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, and behenyl (meth)acrylate, more preferably one or more selected from the group consisting of tetradecyl (meth)acrylate, hexadecyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, and behenyl (meth)acrylate, even more preferably one or more selected from the group consisting of stearyl (meth)acrylate and behenyl (meth)acrylate, even more preferably one or more selected from the group consisting of stearyl acrylate and behenyl acrylate, and even more preferably stearyl acrylate.

[0018] From the viewpoints of improving the water insolubility of component (A) and the shear thinning properties and elastic modulus recovery properties of the oil-based composition, the content of the structural units derived from the alkyl (meth)acrylate in component (A) is preferably 10 mass% or more, more preferably 30 mass% or more, even more preferably 50 mass% or more, still more preferably 70 mass% or more, still more preferably 80 mass% or more, still more preferably 90 mass% or more, still more preferably 95 mass% or more, and 100 mass% or less.

[0019] That is, component (A) may be a polymer consisting only of structural units derived from alkyl (meth)acrylates in which the alkyl group has 10 or more and 30 or less carbon atoms, and may also contain other structural units as long as the effects of the present invention are not impaired. From the viewpoint of improving the shear-thinning property and elastic modulus recovery property of the oil-based composition, the other structural unit is preferably a structural unit derived from a compound capable of copolymerization with the alkyl (meth)acrylate.The compound is preferably a nonionic compound, and examples thereof include alkyl (meth)acrylates having an alkyl group carbon number of 1 to 9, such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, and butyl (meth)acrylate; (meth)acrylic acid esters having an alicyclic structure, such as cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentanyl (meth)acrylate, and adamantyl (meth)acrylate; (meth)acrylic acid esters having an aromatic ring, such as phenylethyl (meth)acrylate and benzyl (meth)acrylate; polyalkylene glycol (meth)acrylate; (meth)acrylic acid esters such as hydroxyalkyl (meth)acrylate, and vinyl esters such as vinyl acetate.

[0020] From the viewpoint of improving the shear thinning properties and elastic modulus recovery properties of the oil-based composition, the melting point of component (A) is preferably 30°C or higher, more preferably 40°C or higher, and even more preferably 45°C or higher, and is preferably 150°C or lower, more preferably 120°C or lower, even more preferably 100°C or lower, still more preferably 90°C or lower, still more preferably 80°C or lower, still more preferably 70°C or lower, and still more preferably 65°C or lower. The melting point of component (A) can be specifically measured by the method described in the examples.

[0021] From the viewpoint of improving the shear thinning properties and elastic modulus recovery properties of the oil-based composition, the weight average molecular weight (Mw) of component (A) is preferably 10,000 or more, more preferably 50,000 or more, and even more preferably 80,000 or more, and is preferably 5 million or less, more preferably 3 million or less, and even more preferably 1 million or less. The weight average molecular weight of the component (A) can be measured by gel permeation chromatography (GPC) under the following conditions, for example. [Measurement conditions] Column: Two "K-806L" columns (Showa Denko K.K.) connected in series Column temperature: 40℃ Eluent: 1mmol / L dimethyllaurylamine, chloroform solution (Dimethyllaurylamine: Farmin DM2098: manufactured by Kao Corporation) Flow rate: 1.0mL / min Detector: Differential refractive index detector Standard material: polystyrene

[0022] Commercially available products can also be used as component (A), such as "TEGO SP 13-1" (poly(stearyl acrylate)) and "TEGO SP 13-6" (poly(behenyl acrylate)) manufactured by EVONIK.

[0023] <Component (B): one or more oily components selected from the group consisting of fatty acids having 10 to 30 carbon atoms and a hydroxyl group, alcohols having 10 to 30 carbon atoms, and amides of carboxylic acids having 10 to 30 carbon atoms> The composition of the present invention contains, as component (B), one or more oily components selected from the group consisting of fatty acids having 10 to 30 carbon atoms and a hydroxyl group, alcohols having 10 to 30 carbon atoms, and amides of carboxylic acids having 10 to 30 carbon atoms. Component (B) mainly exerts an effect of improving the shear thinning property in the oily composition.

[0024] (Fatty acids with 10 to 30 carbon atoms and a hydroxyl group) From the viewpoint of improving the shear-thinning properties of the oil-based composition, the fatty acid having a hydroxyl group and having 10 to 30 carbon atoms is preferably a fatty acid having a hydroxyl group and having 12 or more carbon atoms, more preferably 14 or more, even more preferably 16 or more, and preferably 28 or less, more preferably 24 or less, even more preferably 22 or less. The fatty acid may be either a saturated fatty acid or an unsaturated fatty acid, but from the viewpoint of improving the shear-thinning property of the oil-based composition, it is preferably a saturated fatty acid. The number of hydroxyl groups in the fatty acid is preferably 1 or more and 3 or less, more preferably 1 or more and 2 or less, and even more preferably 1.

[0025] Specific examples of fatty acids having 10 to 30 carbon atoms and having a hydroxy group include hydroxydecanoic acid, hydroxyundecanoic acid, hydroxyundecylenic acid, hydroxylauric acid, hydroxytridecanoic acid, hydroxymyristic acid, hydroxypentadecanoic acid, hydroxypalmitic acid, hydroxyisopalmitic acid, hydroxypalmitoleic acid, hydroxymargaric acid, hydroxystearic acid, hydroxyisostearic acid, hydroxyoleic acid, hydroxylinoleic acid, hydroxylinolenic acid, hydroxynonadecanoic acid, hydroxyarachidic acid, hydroxyarachidonic acid, hydroxybehenic acid, hydroxyerucic acid, hydroxylignoceric acid, hydroxynervonic acid, hydroxycerotic acid, hydroxymontanic acid, and hydroxymelissic acid, and one or more of these may be used. Among the above, from the viewpoint of improving the shear-thinning property and elastic modulus recovery of the oily composition, the fatty acid having a carbon number of 10 to 30 and having a hydroxy group is preferably one or more selected from the group consisting of hydroxylauric acid, hydroxytridecanoic acid, hydroxymyristic acid, hydroxypentadecanoic acid, hydroxypalmitic acid, hydroxyisopalmitic acid, hydroxyheptadecanoic acid, hydroxystearic acid, hydroxyisostearic acid, hydroxyoleic acid, hydroxylinoleic acid, hydroxynonadecanoic acid, hydroxyeicosanoic acid, and hydroxybehenic acid, more preferably one or more selected from the group consisting of hydroxymyristic acid, hydroxypalmitic acid, hydroxystearic acid, and hydroxybehenic acid, and even more preferably hydroxystearic acid. As the hydroxystearic acid, from the viewpoint of improving the shear-thinning property of the oily composition and from the viewpoint of easy availability, 12-hydroxystearic acid is preferable.

[0026] (Alcohol with 10 to 30 carbon atoms) From the viewpoint of improving the shear thinning properties of the oil-based composition, the alcohol having 10 to 30 carbon atoms preferably has 12 or more carbon atoms, more preferably 14 or more, even more preferably 16 or more, and preferably has 28 or less, more preferably 24 or less, even more preferably 22 or less. From the viewpoint of improving the shear thinning properties of the oil-based composition, the alcohol is preferably a saturated or unsaturated primary alcohol, more preferably a saturated primary alcohol. From the viewpoint of improving the shear-thinning property of the oil-based composition, the alcohol is preferably a linear or branched chain alcohol, and more preferably a linear chain alcohol.

[0027] Specific examples of alcohols having 10 to 30 carbon atoms include decanol, undecanol, lauryl alcohol, tridecyl alcohol, myristyl alcohol, pentadecyl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, and behenyl alcohol, and one or more of these may be used. Among the above, from the viewpoint of improving the shear thinning properties and elastic modulus recovery properties of the oil-based composition, the alcohol having 10 to 30 carbon atoms is preferably one or more selected from the group consisting of lauryl alcohol, tridecyl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, and behenyl alcohol, more preferably one or more selected from the group consisting of myristyl alcohol, cetyl alcohol, stearyl alcohol, and behenyl alcohol, and even more preferably one or more selected from the group consisting of cetyl alcohol, stearyl alcohol, and behenyl alcohol.

[0028] (Amide of a carboxylic acid having 10 to 30 carbon atoms) Examples of amides of carboxylic acids having 10 to 30 carbon atoms (hereinafter simply referred to as "carboxylic acid amides") include primary carboxylic acid amides represented by R-CONH2 (R represents a hydrocarbon group having 9 to 29 carbon atoms), secondary carboxylic acid amides represented by R-CONHR' (R represents a hydrocarbon group having 9 to 29 carbon atoms, and R' represents a monovalent hydrocarbon group), and tertiary carboxylic acid amides represented by R-CONR'R" (R represents a hydrocarbon group having 9 to 29 carbon atoms, and R' and R" each independently represent a monovalent hydrocarbon group). Among these, primary carboxylic acid amides are preferred from the viewpoint of improving the shear-thinning properties of the oil-based composition. From the viewpoint of improving the shear-thinning properties of the oil-based composition, the carboxylic acid is a monovalent carboxylic acid having preferably 12 or more carbon atoms, more preferably 14 or more, even more preferably 16 or more carbon atoms, and preferably 28 or less, more preferably 24 or less, even more preferably 22 or less. The carboxylic acid may be either a saturated carboxylic acid or an unsaturated carboxylic acid. From the viewpoint of improving the shear-thinning property of the oil-based composition, the carboxylic acid is preferably a linear or branched carboxylic acid, and more preferably a linear carboxylic acid.

[0029] Specific examples of the carboxylic acid amide include decanoic acid amide, undecanoic acid amide, undecylenic acid amide, lauric acid amide, tridecanoic acid amide, myristic acid amide, pentadecanoic acid amide, palmitic acid amide, isopalmitic acid amide, palmitoleic acid amide, margaric acid amide, stearic acid amide, isostearic acid amide, oleic acid amide, linoleic acid amide, linolenic acid amide, nonadecanoic acid amide, arachidic acid amide, arachidonic acid amide, behenic acid amide, erucic acid amide, lignoceric acid amide, nervonic acid amide, cerotic acid amide, montanic acid amide, and melissic acid amide, and one or more of these may be used. Among the above, from the viewpoint of improving the shear thinning properties and elastic modulus recovery properties of the oil-based composition, the carboxylic acid amide is preferably one or more selected from the group consisting of lauric acid amide, myristic acid amide, palmitic acid amide, palmitoleic acid amide, margaric acid amide, stearic acid amide, oleic acid amide, linoleic acid amide, linolenic acid amide, arachidic acid amide, arachidonic acid amide, and behenic acid amide, more preferably one or more selected from the group consisting of palmitic acid amide, palmitoleic acid amide, margaric acid amide, stearic acid amide, oleic acid amide, linoleic acid amide, linolenic acid amide, and behenic acid amide, and even more preferably oleic acid amide.

[0030] The component (B) can be used alone or in combination of two or more. Among the above, from the viewpoint of improving the shear-thinning property and elastic modulus recovery of the oily composition, component (B) is preferably one or more selected from the group consisting of hydroxymyristic acid, hydroxypalmitic acid, hydroxystearic acid, hydroxybehenic acid, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, palmitic acid amide, palmitoleic acid amide, margaric acid amide, stearic acid amide, oleic acid amide, linoleic acid amide, linolenic acid amide, and behenic acid amide, and more preferably one or more selected from the group consisting of hydroxystearic acid, cetyl alcohol, stearyl alcohol, behenyl alcohol, and oleic acid amide. Furthermore, from the viewpoint of imparting sufficient hardness to maintain the shape as a solid preparation, 12-hydroxystearic acid is preferred.

[0031] <Component (C): Oil-based components other than component (B)> The composition of the present invention contains, as component (C), an oily component other than component (B). Component (C) is capable of dissolving components (A) and (B) and may be an oil that is solid or liquid at room temperature (25° C.), and is preferably a non-volatile oil. As used herein, "non-volatile" refers to having a boiling point of more than 260°C at normal pressure. Examples of the component (C) include one or more selected from the group consisting of hydrocarbon oils, ester oils, ether oils, silicone oils, higher fatty acids, fluorine-based oils, and waxes.

[0032] (Hydrocarbon oil) Examples of the hydrocarbon oil include squalene, squalane, liquid paraffin, liquid isoparaffin, isohexadecane, isoeicosane, hydrogenated polyisobutene, light liquid isoparaffin, heavy liquid isoparaffin, α-olefin oligomer, and cycloparaffin.

[0033] (Ester oil) Examples of the ester oil include synthetic ester oils and natural fats and oils, such as esters of monovalent carboxylic acids and monovalent alcohols, esters of monovalent carboxylic acids and polyvalent alcohols, and esters of polyvalent carboxylic acids and monovalent alcohols.

[0034] Examples of the ester of a monovalent carboxylic acid and a monohydric alcohol include the ester represented by the following general formula (1). R 1 -COO-R 2 (1) In the general formula (1), R 1 represents a linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms, which may be substituted with a hydroxyl group, or an aromatic group having 6 to 24 carbon atoms, R 2 represents a linear or branched alkyl or alkenyl group having 1 to 30 carbon atoms.

[0035] R 1 When is an alkyl group or an alkenyl group, it preferably has 7 or more carbon atoms and preferably has 23 or less, more preferably 21 or less, even more preferably 19 or less, and still more preferably 17 or less. R 1 When is an aromatic hydrocarbon group, the number of carbon atoms is preferably 6 or more and preferably 22 or less, more preferably 20 or less. R 2 The number of carbon atoms is preferably 2 or more, and is preferably 28 or less, more preferably 24 or less, and further preferably 20 or less. Even more preferably, in the general formula (1), R 1 is a linear or branched alkyl group having 7 to 17 carbon atoms, or an aromatic group having 6 to 24 carbon atoms, R 2 is an ester in which the alkyl group is a straight or branched alkyl group having from 2 to 24 carbon atoms.

[0036] Specific examples of the ester represented by the general formula (1) include cetyl isooctanoate, stearyl isooctanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, butyl myristate, isopropyl myristate, decyl myristate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, 2-octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, isostearyl palmitate, and palmitate. and at least one selected from the group consisting of 2-hexyldecyl ester, 2-ethylhexyl stearate, 2-hexyldecyl stearate, isopropyl isostearate, 2-hexyldecyl isostearate, ethyl oleate, isodecyl oleate, oleyl oleate, octyldodecyl oleate, ethyl linoleate, isopropyl linoleate, lanolin acetate, castor oil fatty acid methyl (methyl ricinoleate), ethylhexyl methoxycinnamate, and alkyl benzoate (alkyl having 12 to 15 carbon atoms).

[0037] Examples of the ester of a monovalent carboxylic acid and a monohydric alcohol include an ester represented by the following general formula (2). R 3 -COO-(AO) n -R 4 (2) In the general formula (2), R 3 represents a linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms, which may be substituted with a hydroxyl group; R 4 represents an aromatic hydrocarbon group having 6 to 24 carbon atoms, AO represents an alkyleneoxy group having 2 to 4 carbon atoms, and n represents the average number of moles added of 1 to 50. R 3 is preferably an alkyl group having 7 or more carbon atoms and preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less. R 4is preferably an aromatic-containing hydrocarbon group having 6 or more carbon atoms and preferably 22 or less, more preferably 20 or less, even more preferably 18 or less, and still more preferably a benzyl group. The AO group is preferably a propyleneoxy group, and n is preferably 1 or more and 10 or less, more preferably 1 or more and 5 or less. Specific examples of the ester represented by general formula (2) include an ester of myristic acid and a 3-mol propylene oxide adduct of benzyl alcohol ("Crodamol STS"), and an ester of 2-ethylhexanoic acid and a 3-mol propylene oxide adduct of benzyl alcohol ("Crodamol SFX"), etc.

[0038] Examples of the ester of a monovalent carboxylic acid and a polyhydric alcohol include the ester represented by the following general formula (3). R 5 -(OCOR 6 ) p (3) In the general formula (3), R 5 represents a polyhydric alcohol residue, preferably a hydrocarbon group having 2 to 10 carbon atoms; R 6 represents a monovalent carboxylic acid residue having 1 to 25 carbon atoms, and p represents an integer of 2 to 10. In addition, R 5 may have an ether bond, but is preferably a linear or branched hydrocarbon group having 2 to 10 carbon atoms. Also, p is the same number as the number of hydroxy groups in the polyhydric alcohol. However, this does not exclude the inclusion of a small amount of a compound in which some of the hydroxy groups in the polyhydric alcohol are not esterified. R 6 is preferably an alkyl group having 7 or more carbon atoms, and from the same viewpoint as above, preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less. Even more preferably, in the general formula (3), R 5 is a glycerin residue or a pentaerythritol residue, and R 6 is an ester in which the alkyl group has 7 to 19 carbon atoms.

[0039] Specific examples of the ester represented by general formula (3) include propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol di-2-ethylhexanoate, propanediol di(caprylic / capric acid), propanediol diisostearate, ethylene glycol di-2-ethylhexanoate, glyceryl tri(caprylic / capric acid), glyceryl tri-2-ethylhexylate, glyceryl tri-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, and natural fats and oils. Examples of natural fats and oils include triglycerides such as avocado oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, and mink oil.

[0040] Examples of the esters of polyvalent carboxylic acids and monohydric alcohols include esters represented by the following general formula (4). R 7 -(COOR 8 ) q (4) In the general formula (4), R 7 is a polycarboxylic acid residue having 2 to 10 carbon atoms, and R 8 represents a monohydric alcohol residue having 1 to 24 carbon atoms, and q is an integer of 2 to 10. In addition, q is the same number as the number of carboxy groups in the polycarboxylic acid. However, this does not exclude the presence of a small amount of a compound in which some of the carboxy groups in the polycarboxylic acid are not esterified. R 8 has preferably 3 or more carbon atoms, more preferably 6 or more carbon atoms, and from the same viewpoint as above, preferably 22 or less, more preferably 20 or less, and even more preferably 18 or less carbon atoms. Even more preferably, in the general formula (4), R 7 is a trimellitic acid residue, and R 8is an ester having a branched chain alkyl group having 6 to 18 carbon atoms.

[0041] Specific examples of the ester represented by general formula (4) include diisostearyl malate, di-2-ethylhexyl succinate, diisobutyl adipate, di-2-heptylundecyl adipate, di-2-ethylhexyl sebacate, diisopropyl sebacate, and tri-2-ethylhexyl trimellitate.

[0042] Among the above, from the viewpoint of improving the shear thinning property and elastic modulus recovery property of the oil-based composition, the ester oil is preferably an ester of a monovalent carboxylic acid and a monohydric alcohol represented by general formula (1), an ester of a monovalent carboxylic acid and a polyhydric alcohol represented by general formula (3), or an ester of a polyvalent carboxylic acid and a monohydric alcohol represented by general formula (4), and more preferably an ester of a monovalent carboxylic acid and a monohydric alcohol represented by general formula (1).

[0043] (Ether oil) The ether oil may be a dialkyl ether compound represented by the following general formula (5) or a polyoxyalkylene alkyl ether compound represented by the following general formula (6). R 9 -OR 10 (5) In the general formula (5), R 9 and R 10 each independently represents a linear or branched alkyl or alkenyl group having 6 to 22 carbon atoms, or an aromatic hydrocarbon group having 6 to 24 carbon atoms. R 9 and R 10 From the viewpoint of improving the shear thinning properties and elastic modulus recovery properties of the oil-based composition, is preferably an alkyl group, and the number of carbon atoms therein is preferably 8 or more and preferably 18 or less, more preferably 16 or less, and even more preferably 12 or less.

[0044] R 11 -O-(PO) r (EO) s -H (6) In the general formula (6), R 11 represents an alkyl or alkenyl group having 6 to 22 carbon atoms, PO represents a propyleneoxy group, and EO represents an ethyleneoxy group. r represents the average number of moles added of 0.1 to 15, and s represents the average number of moles added of 0 to 10. When s is not 0, the addition form of PO and EO may be random or block. R 11 The number of carbon atoms is preferably 8 or more, and preferably 20 or less, more preferably 18 or less, and further preferably 12 or less. From the viewpoint of improving the shear thinning property and elastic modulus recovery property of the oil-based composition, the average number of added moles r is preferably 1 or more, more preferably 2 or more, even more preferably 3 or more, and is preferably 13 or less, more preferably 10 or less, and the average number of added moles s is preferably 5 or less, more preferably 1 or less, even more preferably 0. The polyoxyalkylene alkyl ether compound represented by the general formula (6) is preferably at least one selected from the group consisting of polypropylene glycol, polyoxypropylene octyl ether, polyoxypropylene decyl ether, and polyoxypropylene lauryl ether, each of which has an average added mole number r of propyleneoxy groups of 3 or more and 10 or less.

[0045] (Silicone oil) The silicone oil is preferably at least one selected from the group consisting of dimethylpolysiloxane (dimethicone), dimethiconol (dimethylpolysiloxane having a hydroxyl group at the end), methylphenylpolysiloxane, and modified silicone. Examples of modified silicones include polyether-modified silicones, glyceryl-modified silicones, carboxy-modified silicones, fatty acid-modified silicones, alcohol-modified silicones, aliphatic alcohol-modified silicones, epoxy-modified silicones, fluorine-modified silicones, and alkyl-modified silicones. Among the above, from the viewpoint of improving the shear thinning properties and elastic modulus recovery properties, the silicone oil is preferably one or more selected from the group consisting of dimethylpolysiloxane, dimethiconol, methylphenylpolysiloxane, and modified silicone, more preferably one or more selected from the group consisting of dimethylpolysiloxane, dimethiconol, and polyether-modified silicone, and even more preferably dimethylpolysiloxane.

[0046] (higher fatty acids) Examples of higher fatty acids include fatty acids having 8 or more carbon atoms, preferably 12 or more carbon atoms, and having no hydroxy group, such as capric acid, lauric acid, myristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, oleic acid, behenic acid, coconut oil fatty acid, and lanolin fatty acid.

[0047] (Fluorine-based oil) The fluorine-based oil may include fluoropolyether.

[0048] (Waxes) Examples of waxes include beeswax, spermaceti, lanolin, and carnauba wax.

[0049] The component (C) can be used alone or in combination of two or more. Among the above, from the viewpoint of improving the shear thinning property and elastic modulus recovery property of the oil-based composition, and from the viewpoint of obtaining an oil-based composition for use in cosmetics and the like, component (C) is preferably one or more types selected from the group consisting of hydrocarbon oils and ester oils, more preferably one or more types selected from the group consisting of liquid paraffin and esters represented by the general formula (1) above, even more preferably one or more types selected from the group consisting of liquid paraffin, isopropyl palmitate, and ethylhexyl methoxycinnamate, and even more preferably isopropyl palmitate.

[0050] <Content> The content of component (A) in the oil-based composition is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, and even more preferably 2% by mass or more, from the viewpoint of improving the viscosity of the oil-based composition at low shear rates and improving the recovery of the elastic modulus, and is preferably 30% by mass or less, more preferably 20% by mass or less, even more preferably 10% by mass or less, even more preferably 8% by mass or less, and even more preferably 5% by mass or less, from the viewpoint of low viscosity of the oil-based composition at high shear rates.

[0051] The content of component (B) in the oily composition is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, and even more preferably 2% by mass or more, from the viewpoint of improving the shear thinning property and elastic modulus recovery of the oily composition. Also, from the viewpoint of improving the elastic modulus recovery of the oily composition, it is preferably 30% by mass or less, more preferably 20% by mass or less, even more preferably 10% by mass or less, even more preferably 8% by mass or less, and even more preferably 5% by mass or less.

[0052] The total content of component (A) and component (B) in the oily composition is preferably 0.2% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, even more preferably 2% by mass or more, even more preferably 4% by mass or more, even more preferably 5% by mass or more, from the viewpoint of improving the shear thinning property and elastic modulus recovery of the oily composition. Also, from the viewpoint of low viscosity under high shear rate of the oily composition, it is preferably 60% by mass or less, more preferably 40% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, even more preferably 10% by mass or less.

[0053] The ratio of the content of component (A) to the content of component (B) in the oily composition (mass ratio A / B) is preferably 0.1 or more, more preferably 0.3 or more, even more preferably 0.5 or more, and even more preferably 0.7 or more, from the viewpoint of improving the shear thinning property and elastic modulus recovery of the oily composition. Also, from the viewpoint of low viscosity at high shear rate of the oily composition and improving elastic modulus recovery, it is preferably 20 or less, more preferably 15 or less, even more preferably 10 or less, even more preferably 5.0 or less, even more preferably 3.0 or less, even more preferably 2.0 or less, and even more preferably 1.5 or less.

[0054] The content of component (C) in the oil-based composition is, from the viewpoint of improving the solubility of components (A) and (B), preferably 40% by mass or more, more preferably 50% by mass or more, even more preferably 60% by mass or more, still more preferably 70% by mass or more, still more preferably 80% by mass or more, and still more preferably 85% by mass or more, and from the viewpoint of improving the shear thinning properties and elastic modulus recovery properties of the oil-based composition, preferably 99.8% by mass or less, more preferably 98% by mass or less, and even more preferably 95% by mass or less.

[0055] The ratio of the content of component (A) to the content of component (C) in the oil-based composition (mass ratio A / C) is, from the viewpoint of improving the shear thinning properties and elastic modulus recovery properties of the oil-based composition, preferably 0.001 or more, more preferably 0.005 or more, even more preferably 0.01 or more, still more preferably 0.02 or more, and is preferably 0.5 or less, more preferably 0.2 or less, even more preferably 0.1 or less, still more preferably 0.08 or less, and still more preferably 0.06 or less.

[0056] The ratio of the content of component (B) to the content of component (C) in the oil-based composition (mass ratio B / C) is, from the viewpoint of improving the shear thinning properties and elastic modulus recovery properties of the oil-based composition, preferably 0.001 or more, more preferably 0.005 or more, even more preferably 0.01 or more, still more preferably 0.02 or more, and is preferably 0.5 or less, more preferably 0.2 or less, even more preferably 0.1 or less, still more preferably 0.08 or less, and still more preferably 0.06 or less.

[0057] From the viewpoint of improving the shear thinning properties and elastic modulus recovery properties of the oil-based composition, the total content of components (A) to (C) in the oil-based composition is preferably 50 mass% or more, more preferably 70 mass% or more, even more preferably 80 mass% or more, still more preferably 90 mass% or more, and even more preferably 95 mass% or more, but 100 mass% or less.

[0058] In addition to the above, the oil-based composition may contain other components as necessary, such as surfactants, pH adjusters, ultraviolet absorbers other than components (B) and (C), antioxidants, preservatives, antiperspirants, fragrances, moisturizers, feel adjusters, and anti-inflammatory agents.

[0059] Since the composition of the present invention is an oil-based composition, it is preferable that the water content is low. The water content in the oil-based composition is preferably less than 1 mass%, more preferably 0.5 mass% or less, even more preferably 0.2 mass% or less, even more preferably 0.1 mass% or less, and even more preferably substantially 0 mass%. However, the water content is the amount of water intentionally blended, and does not exclude the content of water already contained in the components (A) to (C).

[0060] The oily composition of the present invention preferably contains a small amount of aqueous medium other than water. The aqueous medium may be a primary alcohol having 4 or less carbon atoms, such as methanol, ethanol, propanol, and butanol. The aqueous medium content in the oily composition is preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 2% by mass or less, even more preferably 1% by mass or less, even more preferably 0.1% by mass or less, and even more preferably substantially 0% by mass.

[0061] From the viewpoint of improving shear thinning property and elastic modulus recovery, the composition of the present invention preferably contains a small amount of hydroxycitric acid derivative and / or its salt. The content of hydroxycitric acid derivative and / or its salt in the oily composition is preferably less than 1% by mass, more preferably 0.1% by mass or less, even more preferably 0.01% by mass or less, even more preferably 0.001% by mass or less, and even more preferably substantially 0% by mass.

[0062] <Viscosity> The oil-based composition of the present invention has high shear thinning properties. Specifically, the viscosity of the oil-based composition at 25°C is preferably 3,000 Pa·s or more at a shear rate of 0.005 (1 / s) and 20 Pa·s or less at a shear rate of 100 (1 / s), more preferably 10,000 Pa·s or more at a shear rate of 0.005 (1 / s) and 10 Pa·s or less at a shear rate of 100 (1 / s), even more preferably 30,000 Pa·s or more at a shear rate of 0.005 (1 / s) and 5.0 Pa·s or less at a shear rate of 100 (1 / s), and even more preferably 40,000 Pa·s or more at a shear rate of 0.005 (1 / s) and 1.5 Pa·s or less at a shear rate of 100 (1 / s). The viscosity of the oily composition can be measured by a rheometer, specifically, by the method described in the examples.

[0063] <Recovery of elastic modulus> The oily composition of the present invention has high elastic modulus recovery after shear stress.Specifically, the storage elastic modulus of the oily composition is measured using a rheometer at 25°C under conditions of 0.01% strain and 1Hz frequency (initial storage elastic modulus a), and the storage elastic modulus (storage elastic modulus b) is measured after 1200 seconds by applying 3000% strain (1Hz frequency) to the oily composition for 0.02 seconds and then returning to 0.01% strain and 1Hz frequency, and the recovery rate of the storage elastic modulus calculated by the following formula is preferably 50% or more, more preferably 60% or more, even more preferably 70% or more, even more preferably 80% or more, even more preferably 90% or more, and even more preferably 100%. Storage elastic modulus recovery rate (%) = b / a × 100 The storage modulus and recovery rate thereof of the oily composition can be specifically measured by the method described in the Examples.

[0064] [Emulsifying composition] The present invention provides an emulsion composition comprising the oily composition and water. The emulsion composition may be either an oil-in-water emulsion composition or a water-in-oil emulsion composition. The content of the oily composition in the emulsion composition can be appropriately selected depending on the form of the emulsion composition. From the viewpoint of the stability of the obtained emulsion composition and of exhibiting the performance derived from the oily composition, the content is preferably from 1% by mass to 95% by mass, more preferably from 5% by mass to 90% by mass, and even more preferably from 10% by mass to 80% by mass. The water content in the emulsion composition can also be appropriately selected depending on the form of the emulsion composition, but is usually from 1% by mass to 99% by mass, preferably from 5% by mass to 90% by mass.

[0065] In addition to the oily composition and water, the emulsion composition may also contain volatile organic solvents, emulsifiers, surfactants, pH adjusters, UV absorbers, antioxidants, preservatives, antiperspirants, fragrances, moisturizers, texture adjusters, anti-inflammatory agents, and the like.

[0066] The method for producing the oily composition and the emulsion composition is not particularly limited, and they can be produced by a conventional method.

[0067] [Cosmetics] The present invention provides a cosmetic preparation containing the oily composition or emulsion composition. The oily composition and emulsion composition can be used as a cosmetic preparation as is, or a functional ingredient such as a cosmetic ingredient can be further added to the cosmetic preparation. From the viewpoint of effectively exerting the effects of the present invention, namely, the high shear-thinning property and elastic modulus recovery property of the oil-based composition, the cosmetic is preferably a skin cosmetic, and examples thereof include lipstick, gloss, foundation, makeup base, sunscreen, milky lotion, beauty serum, cream, etc. The cosmetic formulation is not particularly limited, and may be in any form, such as a solid, liquid, foam, paste, gel, cream, etc. From the viewpoint of effectively exerting the effects of the present invention, that is, high shear thinning property and high elastic modulus recovery property of the oily composition, the cosmetic formulation is preferably in a solid form.

[0068] <Use of the composition> The oily composition and the emulsion composition are also suitable for use as external preparations other than cosmetics, such as various external preparations for the skin, including balms, sticks, creams, lotions, and ointments containing medicinal ingredients. EXAMPLES

[0069] The present invention will be described below with reference to examples, but the present invention is not limited to the scope of the examples. In the examples, various measurements and evaluations were carried out by the following methods.

[0070] <Melt point measurement> The melting point of component (A) was measured using a differential scanning calorimeter "DSC7000X" (manufactured by Hitachi High-Tech Science Co., Ltd.). 0.02 g of the sample was weighed into an aluminum pan, heated to 100°C, and then cooled from 100°C to 0°C at a rate of 10°C / min. The sample was then heated at a rate of 10°C / min, the amount of heat was measured, and the maximum endothermic peak temperature was taken as the melting point.

[0071] <Shear viscosity measurement> The shear viscosity (unit: Pa s) of the oily composition obtained in each example was measured using a rheometer ("MCR302" manufactured by Anton Paar). The spindle used was a CP25-2 (cone plate, cone radius 25 mm, cone angle 1.984°), and the temperature inside the measurement chamber was set at 25°C. The oily composition to be measured was heated to 90°C in advance, placed on a jig in a uniformly dissolved state, and left at room temperature for 5 minutes before cooling. The shear viscosity of the oily composition was measured by sweeping the shear rate from low to high within a range of 0.005 (1 / s) to 5000 (1 / s), and the values ​​of shear viscosity at shear rates of 0.005 (1 / s) and 100 (1 / s) are shown in the table. The shear viscosity at a shear rate of 0.005 (1 / s) is an evaluation value of "hardness", and the larger the value, the harder the oily composition is. The shear viscosity at a shear rate of 100 (1 / s) is an evaluation value of "ease of application", and the smaller the value, the easier the oily composition is to spread on an object.

[0072] <Storage elastic modulus recovery rate> The recovery rate (unit: %) of the storage modulus of the oily composition obtained in each example was measured using a rheometer ("MCR302" manufactured by Anton Paar) according to the following procedure. The spindle used was CP25-2 (cone plate, cone radius 25 mm, cone angle 1.984°). The temperature inside the measurement chamber was set at 25°C. The oily composition as the measurement sample was heated to 90°C in advance, placed on a jig in a uniformly dissolved state, and left at room temperature for 5 minutes before cooling. First, the storage modulus of the oily composition was measured for 1 minute under the conditions of 0.01% strain and 1Hz frequency, and then 3000% strain (1Hz frequency) was applied to the oily composition for 0.02 seconds. Then, the strain was returned to 0.01% and the frequency was returned to 1Hz, and the measurement was continued for 1200 seconds. The number of measurement points was one per second, and the time course of the storage modulus was observed. The storage modulus at the end of the measurement was divided by the storage modulus immediately before the 3000% strain was applied, and the percentage was shown in the table as "storage modulus recovery rate." A larger value indicates that the oily composition has better elastic modulus recovery after the shear stress is applied.

[0073] Examples 1 to 13 and Comparative Examples 1 to 2 (Preparation and Evaluation of Oily Compositions) The required amount of each component shown in the table was weighed and placed in a 10 mL glass vial, heated at 90°C, and stirred until transparent. The mixture was then left to cool at room temperature to obtain an oily composition. The obtained oily composition was subjected to various evaluations using the above-mentioned methods. The results are shown in Tables 1 to 2. The blend amounts (mass %) shown in the tables are all amounts of active ingredients.

[0074] [Table 1]

[0075] [Table 2]

[0076] The ingredients listed in the table are as follows. Each product obtained was used in the experiment without purification. <Component (A)> Poly(stearyl acrylate): EVONIK "TEGO SP 13-1", melting point: 49°C, Mw: 100,000 Poly(behenyl acrylate): EVONIK "TEGO SP 13-6", melting point: 66°C, Mw: 100,000 <Ingredient (B)> 12-Hydroxystearic acid: Fujifilm Wako Pure Chemical Industries, Ltd. Stearyl alcohol: Kao Corporation "Kalcol 8028" Behenyl alcohol: Kao Corporation "Kalcol 22D-80" Oleamide: Fujifilm Wako Pure Chemical Industries, Ltd., oleic acid amide <Ingredient (C)> Isopropyl palmitate: Fujifilm Wako Pure Chemical Industries, Ltd. Liquid paraffin: Fujifilm Wako Pure Chemical Industries, Ltd. Ethylhexyl methoxycinnamate: Fujifilm Wako Pure Chemical Industries, Ltd.

[0077] From Table 1, it can be seen that the oily composition of the present invention has shear-thinning properties, that is, high viscosity at low shear rates and low viscosity at high shear rates, and has high recovery of storage modulus after shear stress is applied.In contrast, from Table 2, the oily composition of Comparative Example 1, which does not contain component (A), and the oily composition of Comparative Example 2, which does not contain component (B), both showed poor recovery of storage modulus. [Industrial Applicability]

[0078] According to the present invention, an oily composition can be provided that has shear-thinning properties, that is, high viscosity at low shear rates and low viscosity at high shear rates, and has high elastic modulus recovery after shear stress is applied. When used as an external preparation, the oily composition has sufficient hardness to maintain the shape of a solid preparation, is easy to spread evenly on a target, is not easily removed after application to a target, and has excellent durability of effect.

Claims

1. An oily composition comprising the following components (A) to (C): Component (A): A nonionic water-insoluble polymer containing a structural unit derived from an alkyl (meth)acrylate, the alkyl group of which has 10 to 30 carbon atoms. Component (B): One or more oily components selected from the group consisting of fatty acids having 10 to 30 carbon atoms and a hydroxyl group, alcohols having 10 to 30 carbon atoms, and amides of carboxylic acids having 10 to 30 carbon atoms. Component (C): Oily component other than component (B)

2. 2. The oily composition according to claim 1, wherein the melting point of said component (A) is 30°C or higher.

3. 2. The oily composition according to claim 1, wherein the content of the structural units derived from alkyl (meth)acrylate in the component (A) is 10% by mass or more.

4. 2. The oily composition according to claim 1, wherein the alkyl (meth)acrylate in component (A) is at least one selected from the group consisting of stearyl acrylate and behenyl acrylate.

5. 2. The oily composition according to claim 1, wherein the content of said component (A) in said oily composition is 1% by mass or more.

6. 2. The oily composition according to claim 1, wherein the component (B) is at least one member selected from the group consisting of hydroxystearic acid, cetyl alcohol, stearyl alcohol, behenyl alcohol, and oleic acid amide.

7. 2. The oily composition according to claim 1, wherein the component (C) is at least one selected from the group consisting of hydrocarbon oils, ester oils, ether oils, silicone oils, higher fatty acids, fluorine-based oils, and waxes.

8. An emulsion composition comprising the oily composition according to any one of claims 1 to 7 and water.

9. A cosmetic comprising the oily composition according to any one of claims 1 to 7.

10. A cosmetic containing the emulsion composition described in claim 8.