WO2021149808A1 - Oil-in-water emulsion cosmetic composition - Google Patents

Abstract

The purpose of the present invention is to provide an oil-in-water emulsion cosmetic composition which does not lose fresh and refreshing texture achieved by a water absorbent polymer blended therein even if a polar oil is also blended therein, and which glides smoothly onto the skin, while exhibiting high skin compatibility. The present invention relates to an oil-in-water emulsion cosmetic composition which contains (A) an oil-phase thickening agent, (B) a water absorbent polymer and (C) a polar oil, and which is characterized in that the mass ratio of the blending amount of the oil-phase thickening agent (A) to the blending amount of the polar oil (C), namely A/C is within the range of from 0.001 to 0.25.

Description

Underwater oil type emulsified cosmetic

The present invention relates to an oil-in-water emulsified cosmetic that has a fresh and refreshing feel while blending polar oil. More specifically, the present invention relates to an oil-in-water emulsified cosmetic that has a refreshing feel even when a relatively large amount of polar oil is blended, spreads well on the skin, and is quickly familiar to the skin.

The oil-in-water emulsification base is preferred as a cosmetic base that gives a fresh feeling of use because the outer phase (continuous phase), that is, the phase that first comes into contact with the skin is the aqueous phase. Various attempts have been made to further improve and make attractive cosmetics while making the best use of such characteristics of oil-in-water emulsification bases.

For example, Patent Document 1 describes that a gel-like cosmetic containing a polyacrylic acid-based water-absorbing polymer having a water absorption ratio of 5 to 50 g / g has a fresh feel and good formulation stability. There is. Further, Patent Document 2 describes that in a sunscreen emulsion having an organic ultraviolet absorber in the oil phase and untreated zinc oxide in the aqueous phase, sodium polyacrylate having a specific molecular weight is added to water together with a specific phenol polymer. It is stated that the untreated zinc oxide present in the aqueous phase can be stabilized by blending with the phase.

On the other hand, it is known that by blending an oil component with an oil-in-water emulsification base that gives a fresh feel, it is possible to give a rich application feeling and a glossy skin feeling. However, when the amount of oil, especially polar oil, is increased, stickiness tends to occur and the emulsification stability tends to decrease.

Patent Document 3 describes that stickiness was suppressed in a cosmetic composition in the form of an emulsion containing a highly absorbent polymer and an organic UV blocking agent (oil-soluble ultraviolet absorber). The super absorbent polymer used in Patent Document 3 is understood as a water-absorbent polymer defined by the amount of absorbable aqueous fluid (distilled water), but the water-absorbent polymer and the co-blended water-absorbing polymer are mixed. In view of the amount of oil, it is presumed that in the cosmetic composition of Patent Document 3, even if the stickiness is suppressed, the spreadability on the skin is poor and the skin familiarity is slow.

Japanese Unexamined Patent Publication No. 2016-121140 Japanese Patent No. 5001267 Japanese Unexamined Patent Publication No. 2011-006413

In view of the current state of the art, the present invention is an underwater oil type that does not lose the fresh and refreshing feel of the co-blended water-absorbent polymer even if it contains polar oil, and that spreads well on the skin and is familiar to the skin. The subject is to provide emulsified cosmetics.

As a result of intensive studies to solve the above problems, the present inventor has added an oil phase thickener to an oil-in-water emulsified cosmetic containing a water-absorbent polymer and a polar oil, and the oil phase thickener. By adjusting the blending amount ratio of polar oil and polar oil, it is possible to blend a relatively large amount of polar oil while taking advantage of the fresh and refreshing feel based on the water-absorbent polymer, and it has excellent spreadability on the skin and familiarity with the skin. They have found that an oil-in-water emulsified cosmetic can be obtained, and have completed the present invention.

That is, the present invention
(A) Oil phase thickener,
An oil-in-water emulsified cosmetic containing (B) a water-absorbent polymer and (C) a polar oil.
In water, the mass ratio (A / C) of the blended amount of the (A) oil phase thickener to the blended amount of the (C) polar oil is in the range of 0.001 to 0.25. Provide oil-type emulsified cosmetics.

The product (X × Y) of the water absorption rate (X) of the water-absorbent polymer (B) and the blending amount (Y mass%) thereof in the oil-in-water emulsified cosmetic of the present invention is within the range of 20 to 75. Is preferable. Further, when the cosmetic of the present invention is blended with the (D) associative thickener, it spreads and spreads on the skin with the feeling that water pops out from the inside of the cosmetic by pressing with a finger or a hand after application. Gives a feeling of use.

Even if the oil-in-water emulsified cosmetic of the present invention contains polar oil, when it is applied to the skin, it is easy to feel the freshness caused by the water-absorbent polymer, and it spreads well on the skin and fits quickly. After application, a moist feel is obtained due to the oil content.
In addition, since oil-soluble agents such as UV absorbers can be stably retained as polar oils, skin care cosmetics that have both a fresh feel and a high UV protection effect (high SPF (Sun protection Factor)), such as sunscreen, should be used. Is possible.

The oil-in-water emulsified cosmetic of the present invention (hereinafter, also simply referred to as “cosmetic”) contains (A) oil phase thickener, (B) water-absorbent polymer, and (C) polar oil as essential components. .. It will be described in detail below.

(A) Oil phase thickener (A) Oil phase thickener (hereinafter, may be referred to as "component A") is a substance capable of adjusting the viscosity of the oil phase, and is, for example, a dextrin fatty acid ester. , Sucrose fatty acid ester, organically modified clay mineral, fatty acid or salt thereof, solid or semi-solid hydrocarbon oil and the like.

The dextrin fatty acid ester is an ester of dextrin or reduced dextrin and a higher fatty acid, and can be used without particular limitation as long as it is generally used in cosmetics. It is preferable to use dextrin or reduced dextrin having an average degree of sugar polymerization of 3 to 100. Further, as the constituent fatty acid of the dextrin fatty acid ester, it is preferable to use a saturated fatty acid having 8 to 22 carbon atoms. Specific examples thereof include dextrin palmitate, dextrin oleate, dextrin stearate, dextrin myristic acid, and dextrin (palmitic acid / 2-ethylhexanoic acid).

As the sucrose fatty acid ester, those in which the fatty acid is linear or branched, saturated or unsaturated, and has 12 to 22 carbon atoms can be preferably used. Specifically, sucrose caprylic acid ester, sucrose capric acid ester, sucrose lauric acid ester, sucrose myristic acid ester, sucrose palmitate ester, sucrose stearic acid ester, sucrose oleic acid ester, sucrose elca. Acid esters and the like can be mentioned.

The organically modified clay mineral is a kind of colloidal hydrous aluminum silicate having a three-layer structure, and is represented by a clay mineral represented by the following general formula (1) modified with a quaternary ammonium salt type cationic surfactant. Is the target.
(X, Y) _2-3 (Si, Al) ₄ O ₁₀ (OH) ₂ Z _1/3 · nH ₂ O (1)
(However, X = Al, Fe (III), Mn (III), Cr (III), Y = Mg, Fe (II), Ni, Zn, Li, Z = K, Na, Ca)

Specific examples include dimethyl distearyl ammonium hectorite (disteardimonium hectorite), dimethyl alkyl ammonium hectorite, benzyl dimethyl stearyl ammonium hectorite, distearyl dimethyl ammonium chloride-treated aluminum magnesium silicate, and the like. As commercially available products, Benton 27 (benzyl dimethyl stearyl ammonium chloride-treated hectorite: manufactured by Elementis Japan) and Benton 38 (distearyl dimethyl ammonium chloride-treated hectorite: manufactured by Elementis Japan) are preferable.

As the fatty acid, a fatty acid that is solid at room temperature can be used, and examples thereof include myristic acid, palmitic acid, stearic acid, 12-hydroxystearic acid, and behenic acid. Examples of the fatty acid salt include calcium salt, magnesium salt, aluminum salt and the like of these fatty acids.

The solid or semi-solid hydrocarbon oil is a solid or semi-solid hydrocarbon at room temperature (25 ° C.), and specific examples thereof include hydrogenation, hydrogenated palm oil, hydrogenated castor wax, and palm nucleus hardening oil. , Hardened sunflower oil, hydrogenated peanut oil, hydrogenated rapeseed seed oil, hydrogenated camellia oil, hydrogenated soybean oil, hydrogenated olive oil, hydrogenated macadamia nut oil, hydrogenated sunflower oil, hydrogenated wheat germ oil, Examples thereof include hydrogenated rice germ oil, hydrogenated rice bran oil, hydrogenated cotton seed oil, hydrogenated avocado oil, waxes and the like.

The blending amount of the (A) oil phase thickener in the cosmetic of the present invention may vary depending on the blending amount of the co-blended polar oil, but it is more than 0.01% by mass and less than 3% by mass. preferable. For example, it can be in the range of 0.02 to 2.0% by mass, preferably 0.05 to 1.5% by mass, more preferably 0.1 to 1.0% by mass, based on the total amount of cosmetics. Particularly preferably, it is 0.1 to 0.7% by mass.

(B) Water-absorbent polymer The water-absorbent polymer (component B) in the present invention is a polymer capable of absorbing water having a weight of 2 times or more, preferably 10 times or more, more preferably 20 times or more the weight of the polymer itself. Means. The upper limit of the water absorption amount of the water-absorbent polymer is not particularly limited, but it is preferable to use a water-absorbent polymer having a weight of 700 times or less of its own weight.

In general, the water absorption amount (water absorption rate) of a water-absorbent polymer is often specified by the expression "how many times its own weight can absorb water" as described above, but in the present specification, the water-absorbent polymer "is""Water absorption rate (X)" is defined as follows.
(1) A predetermined amount of the water-absorbent polymer is weighed, and a predetermined amount of water is slowly added while stirring.
(2) Stir at 2000 rpm for 2 minutes or more using a disper to make it uniform.
(3) Stop stirring and let stand for 12 hours or more.
(4) After adjusting to 30 ° C., the viscosity is measured with a B-type viscometer (VISCOMETER TVB-10: TOKI SANGYO).
(5) When the viscosity is less than 4900 mPa · s (30 ° C.), the amount of water added in the step (1) is reduced and the above steps (1) to (4) are repeated, and the viscosity is 5100 mPa · s (30 ° C.). If the amount exceeds, the amount of water added in the step (1) is increased and the above (1) to (4) are repeated, and the viscosity in the step (4) becomes within the range of 5000 ± 100 mPa · s (30 ° C.). The amount of water added at that time is defined as the water absorption rate (X) of the water-absorbent polymer.

Examples of the water-absorbent polymer preferably used in the present invention include (B-1) Acrylate cloth polymer-2-Na and (B-2) Na acrylate-grafted starch. These can be blended alone or in combination of two or more.

(B-1) Acrylate Cross Polymer-2-Na
Acrylate crosspolymer-2-Na (B-1 component) is a sodium salt obtained by cross-linking a copolymer consisting of a monomer of acrylic acid, methacrylic acid or one or more simple esters thereof with ethylene glycol diglycidyl ether. ..

Commercially available products can be used for Acrylate Crosspolymer-2-Na (INCI name: Sodium Acrylates Crosspolymer-2). For example, "ARON NT-Z (manufactured by Toagosei Co., Ltd.)" (water absorption rate = 20 to 22), "AQUAKEEP 10SH-NFC (manufactured by Sumitomo Seika Chemical Co., Ltd.)" (water absorption rate = about 200 to 300), etc. are preferable. used.

(B-2) Na Acrylic Acid Graft Starch The Na Acrylic Acid Graft Starch (B-2 component) in the cosmetics of the present invention is a sodium salt obtained by graft-polymerizing acrylic acid on starch (INCI name: Sodium Polyacrylate Starch:). Water absorption rate = 600-700).

As the Na acrylate-grafted starch in the present invention, a commercially available product can be used. Examples of commercially available products include MAKIMOUSSE7 (average particle size about 7 μm), MAKIMOUSSE12 (average particle size about 12 μm), MAKIMOUSSE25 (average particle size about 25 μm), and MAKIMOUSSE400 (average particle size about 400 μm) (these are Daito Kasei Kogyo Co., Ltd.). (Manufactured by the company), Sanflesh ST-100C, ST100MC, IM-300MC (all manufactured by Sanyo Kasei Kogyo Co., Ltd.) and the like.

Further, a super absorbent polymer having starch as a main chain and grafted with an acrylic polymer is also included in the Na-acrylic acid graft starch in the present invention. Commercially available products of such polymers (INCI name: starch / acrylamide / sodium acrylate copolymer) include Water Lock A-240, A-180, B-204, D-223, A-100, C-200 and D. -223 (manufactured by Grain Processing Co., Ltd.) can be mentioned.

The blending amount of the water-absorbent polymer (B component) in the cosmetic of the present invention is 0.06 to 10.0% by mass, preferably 0.1 to 5.0% by mass, more preferably 0, based on the total amount of the cosmetic. .1 to 3.0% by mass.

In the cosmetic of the present invention, the product (X × Y) of the value of the water absorption rate (X) of the (B) water-absorbent polymer and the value of the blending amount (Y mass%) of the water-absorbent polymer is 20. It is preferably in the range of ~ 75, more preferably in the range of 20 to 70, and even more preferably in the range of 24 to 70. It can be said that "XY" represents the amount of water (water absorption amount) that can be absorbed by the water-absorbent polymer blended in the cosmetic. When the value of the water absorption amount (X × Y) is less than 20, or exceeds 75, the goodness of spreading on the skin tends to be slightly lowered.

(C) Polar oil The third essential ingredient in the cosmetic of the present invention is polar oil (also referred to as “C component”). The "polar oil" in the present specification is an oil having an IOB value of 0.05 to 0.80. Here, the IOB value means the ratio of the inorganic value (IV) to the organic value (OV) in the organic conceptual diagram, that is, "inorganic value (IV) / organic value (OV)". For the organic conceptual diagram, refer to, for example, "Organic Conceptual Diagram-Basics and Applications-" (Yoshio Koda, Sankyo Publishing, 1984).

The polar oil (component C) used in the present invention is not particularly limited, but is not particularly limited, but is glyceryl diisostearate, diisostearyl malate, tripropylene glycol pivalate, glyceryl tri2-ethylhexanoate, cetyl octanoate, lauric acid. Hexil, isopropyl myristate, octyl palmitate, isocetyl stearate, isopropyl isostearate, octyl isopalmitate, isodecyl isostearate, 2-ethylhexyl succinate, diethyl sebacate, cetyl ethylhexanate, 2-cyano-3,3- 2-Ethylhexyl diphenylacrylate, tripropylene glycol dipivalate, trimethylolpropane tri2-ethylhexanoate, pentaneerislit tetra2-ethylhexanoate, diethylhexyl naphthalin dicarboxylate, alkyl benzoate (C12-15), tri ( Caprylic capric acid) glycerin, di (capryl capric acid) propylene glycol, di2-ethylhexyl succinate, diisopropyl sebacate, jojoba oil, di lauroyl glutamate (phytosteryl / octyldodecyl), glyceryl triisostearate, triethylhexanoin, Dimerginolic acid (phytosteryl / behenyl), dimerginolic acid (phytosteryl / isostearyl / cetyl / stearyl / isostearyl / cetyl / stearyl / behenyl), isopropyl palmitate, macadamia nut fatty acid phytosteryl, tetra (bechenic acid / benzoic acid) / Ethylhexanoic acid) Examples thereof include pentaerythricyl, ethylhexyl palmitate, myristyl myristate, isodecyl neopentate, and oil-soluble ultraviolet absorbers.

The cosmetic of the present invention can be imparted with an ultraviolet protective effect by incorporating an oil-soluble ultraviolet absorber as part or all of the (C) polar oil. The oil-soluble ultraviolet absorber blended in the cosmetic of the present invention can be selected from those conventionally used in cosmetics. Specific examples include methoxycinnamic acid derivatives, salicylic acid derivatives, benzoyl derivatives, camphor derivatives, para-aminobenzoic acid derivatives, triazine derivatives, benzophenone derivatives, and polysilicone derivatives. More specifically, ethylhexyl methoxycinnamate, octocrylene, polyvinyl-15, t-butylmethoxydibenzoylmethane, ethylhexyltriazone, hexyl diethylaminohydroxybenzoylbenzoate, bisethylhexyloxyphenol methoxyphenyltriazine, oxybenzon-3, methylene Examples thereof include, but are not limited to, bisbenzotriazolyltetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, and octyl salicylate (ethylhexyl salicylate). Further, the oil-soluble ultraviolet absorber can be blended in one kind or a combination of two or more kinds.

Regarding the blending amount of the polar oil (C component) in the cosmetic of the present invention, the mass ratio (A / C) of the blending amount of the (A) oil phase thickener to the blending amount of the (C) polar oil is 0. It is necessary to satisfy the condition that it is in the range of 001 to 0.25. If the mass ratio (A / C) is less than 0.001, the familiarity with the skin becomes slow, and if it exceeds 0.25, the elongation on the skin becomes poor. This mass ratio (A / C) is more preferably 0.001 to 0.2, still more preferably 0.001 to 0.1.

The amount of the polar oil (C) to be blended may satisfy the above conditions, but is usually preferably 3 to 30% by mass, more preferably 4 to 25% by mass, and further, more preferably 4 to 25% by mass, based on the total amount of the cosmetics. It is preferably 5 to 20% by mass, for example, 10 to 20% by mass. If the blending amount is less than 3% by mass, the effect of blending the polar oil cannot be sufficiently obtained, and if the blending amount exceeds 30% by mass, stickiness may occur after application and a fresh feeling of use may be lost.

In addition to the above-mentioned essential ingredients (A), (B) and (C), the cosmetic of the present invention contains other ingredients that can be usually blended in cosmetics and external preparations for skin, as long as the effects of the present invention are not impaired. It can be blended arbitrarily. For example, by blending (D) an associative thickener, a unique fresh feeling of use (collapse feeling) such as collapse and overflow of water is given.

(D) Associative thickener The "associative thickener" is a copolymer having a hydrophilic part made of a water-soluble monomer and a hydrophobic part made of a hydrophobic monomer, and is hydrophobic to each other in an aqueous solvent. It is a thickener having an action of thickening the system by acting as if it behaves as a physically crosslinked macromolecule by associating by action (see, for example, paragraph 0014 of JP-A-2000-239120).

The associative thickener (component D) in the present invention is selected from the group consisting of (D-1) hydrophobically modified polyether urethane, (D-2) hydrophobically modified alkyl cellulose, and (D-3) polyacrylate crosspolymer. It is preferable that the amount is at least one. In the present invention, one of the associative thickeners belonging to any of (D-1) hydrophobically modified polyether urethane, (D-2) hydrophobically modified alkyl cellulose, and (D-3) polyacrylate crosspolymer. Species or two or more species may be used, and a plurality of or two or more species of (D-1), (D-2) and (D-3) may be blended in combination.

(D-1) Hydrophobic Modified Polyether Urethane As the hydrophobic modified polyether urethane (D-1 component) used in the present invention, the following general formula (1):

(In the formula, R ¹ is an aliphatic hydrocarbon group having 24 to 36 carbon atoms, and m represents a number of 0 to 1000), the monohydroxy compound (I) represented by the following general formula (2). ):

Polyethylene glycol (II) represented by (in the formula, n represents a number from 2 to 1000), the following general formula (3):

(In the formula, R ² represents an aliphatic hydrocarbon group having 5 to 12 carbon atoms), and the monoglyceryl ether compound (III) represented by the following general formula (4):

A urethane-type polymer obtained by reacting an isocyanate compound (IV) represented by (R ³ represents a hydrocarbon group having 4 to 13 carbon atoms and q represents a number of 2 or 3) in the formula. It can be exemplified.

This urethane type polymer is obtained by reacting the above compounds (I) to (IV). Specifically, the hydroxyl group contained in each of the compounds (I), (II) and (III) reacts with the isocyanate group contained in (IV). Since there are three types of compounds having hydroxyl groups, two of which are divalent, the resulting polymer has a complex structure and cannot be represented by an appropriate general formula.

The method for producing this urethane-type polymer may be a reaction of each compound in a batch or a reaction in a divided manner, and is not particularly specified as long as the four compounds react. However, even if any of the compounds (I) to (III) is put into the reaction system after the isocyanate compound (IV) has completely reacted, the reaction does not occur. Therefore, the compounds (I) to (III) are mixed in advance. , It is preferable to add the isocyanate compound (IV) to the reaction. Specifically, the compounds (I) to (III) are placed in a reaction system, melt-mixed at 40 to 100 ° C., preferably 60 to 80 ° C., and the isocyanate compound (IV) is reacted while maintaining the same temperature. Add to the system and react. Then, it may be aged at the same temperature for 30 minutes to 3 hours until the reaction is completed.

In the above reaction, the compounding ratio of each component is not particularly specified, but since the function as a viscosity modifier is improved and the reaction is easy to control, a monohydroxy compound (monohydroxy compound) is used based on 10 mol of polyethylene glycol (II). It is preferable that the amount of I) is 10 to 30 mol, the amount of monoglyceryl ether compound (III) is 5 to 20 mol, and the amount of isocyanate compound (IV) is 20 to 50 mol. More preferably, compound (I) is 15 to 25 mol, monoglyceryl ether compound (III) is 8 to 15 mol, and isocyanate compound (IV) is 25 to 40 mol.
Details of this urethane type polymer are described in Japanese Patent No. 6159738.

The hydrophobically modified polyether urethane (D-1 component) in the present invention includes polyethylene glycol ether (tetradecyl octadeces-100) in which the monohydroxy compound (I) is tetradecyl octadecanol, and polyethylene glycol (II). Is PEG-240, the monoglyceryl ether compound (III) is ethylhexyl glycerin, and the isocyanate compound (IV) is hexamethylene diisocyanate (HDI). The copolymer is referred to as "Polyurethane-59" (INCI name: Polyurethane-59) in the cosmetic ingredient labeling name. As the polyurethane-59, a commercially available product may be used, and for example, "ADEKA NOL GT-930" manufactured by ADEKA Corporation is preferably used.

As another example of the hydrophobically modified polyether urethane (D-1 component) in the present invention, the following general formula (I):

Examples thereof include the hydrophobically modified polyether urethane represented by.
In the above formula (I), R ¹ , R ² and R ⁴ independently represent an alkylene group having 2 to 4 carbon atoms or a phenylethylene group, respectively. It is preferably an alkylene group having 2 to 4 carbon atoms.
R ³ represents an alkylene group having 1 to 10 carbon atoms which may have a urethane bond.
R ⁵ represents a linear, branched or secondary alkyl group having 8 to 36 carbon atoms, preferably 12 to 24 carbon atoms.
m is a number of 2 or more, preferably 2. h is a number of 1 or more, preferably 1. k is a number from 1 to 500, preferably a number from 100 to 300. n is a number from 1 to 200, preferably a number from 10 to 100.

A particularly preferable hydrophobically modified polyether urethane (D-1) in the present invention is a (PEG-240 / decyltetradeceth-20 / HDI) copolymer (a copolymer represented by the above formula (I), in which R ¹ = ethyl. Groups, R ² and R ⁴ are ethylene groups, R ³ = hexamethylene groups, R ⁵ = 2-decyltetradecyl groups, h = 1, m = 2, k = 120, n = 20). Be done. The copolymer is commercially available from ADEKA Corporation under the trade name "ADEKANOR GT700" or "ADEKANOL GT730".

(D-2) Hydrophobic Modified Alkyl Cellulose The hydrophobic modified alkyl cellulose (D-2 component) used in the present invention is preferably represented by the general formula (II).

In the above formula (II), R is a binding group R _1- R ₂ , and R ₁ may be the same or different in the molecule, and-[CH ₂ CH (CH ₃ ) O] _r -,-[ CH ₂ CH ₂ O] _r − and − [CH ₂ CH (OH) CH ₂ O] _r − (in the formula, r is an integer of 0 to 4), and R ₂ is , A hydrocarbon group having 12 to 28 carbon atoms (preferably an alkyl group having 1 to 4 carbon atoms), and one or more groups selected from hydrogen atoms, and at least one _{of R 2 in one molecule.} One is a hydrocarbon group having 12 to 28 carbon atoms (preferably an alkyl group having 1 to 4 carbon atoms). A is the group − (CH ₂ ) _t − (t is an integer of 1 to 3), and s is a number from 100 to 10000.

The hydrophobically modified alkyl cellulose of the formula (II) has a structure in which a long-chain alkyl group, which is a hydrophobic group, is introduced into a water-soluble cellulose ether derivative via a polyoxyalkylene chain. The water-soluble cellulose ether derivative on which the molecule is based is, for example, methyl cellulose, ethyl cellulose, propyl cellulose, butyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose and the like, and long-chain alkyl glycidyl ether (for example, the following formula). It can be obtained by reacting with (II').

In formula (II'), R'is an alkyl group having 10 to 28 carbon atoms, preferably 12 to 22 carbon atoms.

As the water-soluble cellulose ether derivative, hydroxypropylmethylcellulose or hydroxyethylcellulose is preferable, and hydroxypropylmethylcellulose is particularly preferable. Furthermore, the R'of the long-chain alkylglycidyl ether (II') is preferably a stearyl group (-C ₁₈ H ₃₇ ) or a cetyl group (-C ₁₆ H ₃₃ ) (in these cases -CH _2). CH (OH) CH ₂ OR'becomes -CH ₂ CH (OH) CH _{2 OC 18} H ₃₇ or -CH ₂ CH (OH) CH ₂ OC ₁₆ H ₃₃ ).

The most preferable embodiment of the hydrophobically modified alkyl cellulose (D-2 component) is stearoxyhydroxypropylmethyl cellulose (INCI name: Hypromellose methylcellulosse Stearoxy Ether) having the hydrophobic group R'in the formula (II') as a stearyl group, and "Sanje It is also possible to use a product marketed by Daido Kasei Kogyo Co., Ltd. under the trade name of "loin". (Product name: Sangelose 90L, 90M, 90H, 60L, 60M, 60H, etc.).

(D-3) Polyacrylate Cross Polymer The polyacrylate cross polymer (D-3 component) used in the present invention is preferably a cross polymer in which a polyacrylate-based main chain is crosslinked with a polyoxyalkylene chain. The polyacrylate-based main chain may have various substituents (side chains) as long as it acts as an associative thickener.

An example of a particularly preferable polyacrylate crosspolymer (D-3 component) is polyacrylate crosspolymer-6 (INCI name: Polyacrylate Crosspolymer-6). Polyacrylate crosspolymer-6 is a copolymer of acryloyldimethyltaurinammonium, dimethylacrylamide, lauryl methacrylate and laures-4 methacrylate crosslinked with trimethylolpropane triacrylate. For example, a product marketed by SEPPIC under the trade name "SEPIMAX ZEN" can be used.

The amount of the (D) associative thickener to be added to the cosmetic of the present invention is 0.1 to 5.0% by mass, preferably 0.2 to 3.0% by mass, based on the total amount of the cosmetic. %, More preferably 0.3 to 0.2.0% by mass. If it is less than 0.1% by mass, a unique feeling of use (feeling of collapse) cannot be realized. On the other hand, if it is blended in excess of 5.0% by mass, stickiness may occur.

In the embodiment in which the (D) associative thickener of the cosmetic of the present invention is blended, since the (C) polar oil is co-blended, there is an appropriate richness when applied, and after application, there is an appropriate richness. By pressing with a finger or hand, it gives the feeling that water spreads on the skin with the feeling that water pops out of the cosmetic. This feeling of use is referred to as "collapse feeling" in the present specification.

A sherbet-like aqueous cosmetic base containing an associative thickener and a water-absorbing polymer is described in WO2019 / 044880, and when the base is applied, the sherbet-like cosmetic is instantly "collapsed and water. It is said that there is a "fresh feeling of use" (feeling of water collapse) that overflows. However, since the base did not substantially contain polar oil, it had a very fresh feel, but the richness was insufficient. The "collapse feeling" obtained by the cosmetic of the present invention means a feeling of freshness after a short time after being applied to the skin, and the "water collapse feeling" obtained by the cosmetic of WO2019 / 044880. Is different.

Other optional ingredients to be added to the cosmetics of the present invention include, but are not limited to, for example, oils (except polar oil (C component)), surfactants, and aqueous phase thickeners (however, increased association). Examples thereof include thickeners (other than D component), powder components, moisturizers, various medicinal components, preservatives, antioxidants and the like.

Examples of the oil component other than the polar oil (C component) include non-polar oils such as silicone oil and hydrocarbon oil.
The surfactant is not particularly limited as long as it can be used for cosmetics and the like. In particular, a hydrophilic nonionic surfactant having an HLB value of 7 or more, preferably 10 or more is preferably used.

It is preferable to add a water-soluble thickener (other than the associative thickener (component D)) as the aqueous phase thickener because the emulsion stability of the cosmetic is further improved.
The water-soluble thickener may be any one that can be blended in cosmetics, and is, for example, a plant-based polymer such as agar, xanthan gum, arabic gum, carrageenan, pectin, quince seed (malmero), and algae colloid (brown algae extract). Molecules, microbial polymers such as dextran and purulan, animal polymers such as collagen, casein and gelatin, alginic acid polymers such as sodium alginate, vinyl polymers such as carboxyvinyl polymers (CARBOPOL, etc.), polyacrylic acid Examples thereof include acrylic polymers such as sodium, polyacrylamide, (acrylic acid / alkyl acrylate (C10-30) copolymer), and inorganic water-soluble polymers such as bentonite, aluminum magnesium silicate, and laponite.

As powder components, inorganic powders such as extender pigments (for example, talc, kaolin, sericite, white mica, synthetic mica, gold mica, red mica, black mica, lithia mica, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, silicic acid) Magnesium silicate, calcium silicate, aluminum silicate, barium silicate, strontium silicate, metal tungrate, silica, hydroxyapatite, zeolite, boron nitride, ceramics powder, etc.), organic powder (PMMA powder, nylon powder, etc.), Alternatively, an ultraviolet scattering agent (titanium oxide, zinc oxide, etc.) can be exemplified. Among them, talc, which is an extender pigment, has the effect of further improving the UV protection ability of cosmetics.

Examples of the moisturizer include polyhydric alcohols such as 1,3-butylene glycol, propanediol, and glycerin, sugar alcohols, and the like.

When a water-soluble ultraviolet absorber such as phenylbenzimidazole sulfonic acid is added to the cosmetic of the present invention, it is inevitably added in the form of a salt with a counterion, and the presence of the counterion is present (B). ) It may interact with the water-absorbent polymer to reduce the usability. Therefore, the cosmetic of the present invention includes an embodiment in which a water-soluble ultraviolet absorber is not blended, and even when blended, it is preferable to limit the blending amount to 0.5% by mass or less.

The viscosity of the cosmetic of the present invention is not particularly limited, but the value measured by a B-type viscometer at 30 ° C. is 10,000 mPa · s or more, preferably 20,000 mPa · s or more, and 200,000 mPa · s. Hereinafter, it is preferably 100,000 mPa · s or less.

The cosmetic of the present invention can be produced according to a method conventionally used for oil-in-water emulsified cosmetics. For example, it can be produced by separately mixing an aqueous component, an arbitrary powder component and an oily component, adding the powder component and the oily component to the aqueous component, and stirring and emulsifying.

The cosmetic of the present invention has the above-mentioned structure, so that it has a fresh feeling of use that is quick to fit on the skin and spreads well. The cosmetic of the present invention is preferably provided as a skin cosmetic, particularly a skin care cosmetic, which makes the best use of these characteristics. The form of the cosmetic is not particularly limited, but it is preferably provided in the form of a cream or a milky lotion, for example.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amount is shown in% by mass.

An oil-in-water emulsified cosmetic (sample) was prepared according to the formulations shown in Tables 1 to 4 below. The following items were evaluated for the samples of each example.
(1) Familiarity (2) Good growth (3) Stability

-Evaluation method (1) Speed of familiarity We asked specialized panelists (10 women) to use each sample (cosmetics) and evaluated based on the answers about the speed of familiarity with the skin when applied to the skin.
A: 8 or more out of 10 responded that they were familiar quickly B: 7 or less panelists who answered that they were familiar quickly C: 7 or less panelists who answered that they were familiar quickly, and panelists who answered that they were not familiar 5 or more

(2) Good stretch We asked specialized panelists (10 women) to use each sample (cosmetics) and evaluated it based on the answers about the good stretch when applied to the skin.
A ⁺ : 9 out of 10 responded that growth was good A: 8 out of 10 responded that growth was good B: 5-7 out of 10 responded that growth was good C: 4 out of 10 responded that growth was good Answered that the following is good growth

(3) Stability The emulsified state of each sample (cosmetics) after being stored at 50 ° C. for 72 hours was visually observed.
A ⁺ : Very good A: Good B: Normal C: Bad

The cosmetics of the present invention (Examples 1 to 18) were quickly applied to the skin, spread well, had a fresh and non-greasy feel, and were excellent in emulsification stability. Among them, Examples 1 to 16 in which the associative thickener was blended were evaluated at almost the highest level in terms of speed of familiarity and good elongation. In addition, (A) Example 3 using disteardimonium hectorite as an oil phase thickener, Example 7 in which the blending amount ratio of (A) / (C) exceeds 0.1, and (B) water absorption. In Examples 10 and 14 in which the product (X × Y) of the water absorption rate of the sex polymer and the blending amount was less than 20 or more than 75, the elongation was slightly reduced as compared with the other examples, but it was practically satisfactory. It was a level.

In addition, the amount of polyglyceryl-6 caprylate in Examples 17 and 17 in which the associative thickener of Example 1 was replaced with the same amount of non-aggregating thickener (polyglyceryl-6 caprylate) was used as a cosmetic. Example 18 in which the total viscosity was increased so as to be equivalent to (37,000 mPa · s) of Example 1 (viscosity 36000 mPa · s (30 ° C., B-type viscometer)) was quick to get used to, but the elongation was slightly reduced. did.

Comparative Example 1 (Table 1) in which the oil phase thickener was not blended with respect to these examples, and comparison in which the mass ratio (A / C) of the oil phase thickener to the polar oil was less than 0.001. In Example 2 (Table 2), the skin familiarity was slow. Further, in Comparative Example 3 in which the mass ratio (A / C) exceeded 0.25, the elongation on the skin became poor.

Claims (9)

1. (A) Oil phase thickener,
   An oil-in-water emulsified cosmetic containing (B) a water-absorbent polymer and (C) a polar oil.
   In water, the mass ratio (A / C) of the blended amount of the (A) oil phase thickener to the blended amount of the (C) polar oil is in the range of 0.001 to 0.25. Oil-type emulsified cosmetics.
2. (A) The cosmetic according to claim 1, wherein the blending amount of the oil phase thickener is more than 0.01% by mass and less than 3% by mass with respect to the total amount of the cosmetic.
3. (A) The cosmetic according to claim 1 or 2, wherein the oil phase thickener is a dextrin fatty acid ester.
4. Any one of claims 1 to 3, wherein the product (X × Y) of the water absorption rate (X) of the water-absorbent polymer (B) and the blending amount (Y mass%) thereof is in the range of 20 to 75. Cosmetics listed in.
5. The cosmetic according to any one of claims 1 to 4, wherein the (B) water-absorbent polymer is (B-1) Acrylate cloth polymer-2-Na.
6. (C) The cosmetic according to any one of claims 1 to 5, wherein the amount of the polar oil blended is 3 to 30% by mass with respect to the total amount of the cosmetic.
7. (C) The cosmetic according to any one of claims 1 to 6, wherein the polar oil contains an oil-soluble ultraviolet absorber.
8. (D) The cosmetic according to any one of claims 1 to 7, further containing an associative thickener.
9. The (D) associative thickener is selected from the group consisting of (D-1) hydrophobically modified polyether urethane, (D-2) hydrophobically modified alkyl cellulose, and (D-3) polyacrylate crosspolymer-6. The cosmetic according to claim 8, which is at least one type.