JP7654396B2 - Cosmetics - Google Patents

Description

The present invention relates to cosmetics suitable for use as beauty serums, etc.

Traditionally, various cosmetics have been developed to be applied to the skin to improve its texture. Such cosmetics are required to have a dense feel and moisturizing effect when used, and also to have good adhesion when applied. In order to satisfy these various characteristics, the incorporation of various ingredients, such as polymeric materials and surfactants, has been considered, but further improvements in properties are required.

JP 2014-037404 A

In general, when improving the desired characteristics of a cosmetic product according to its purpose, it becomes difficult to balance the other characteristics, and it is difficult to simultaneously satisfy all characteristics. In the present invention, there was a demand for a cosmetic product that achieves such a balance while simultaneously improving many characteristics such as non-stickiness, freshness, smoothness, and adhesion.

According to the present invention, the following inventions are provided.
[1] (a) an acrylamide-based thickener,
(b) tamarind gum,
(c) A cosmetic preparation containing water, wherein the blending amount of the acrylamide-based thickener is 0.01 to 1 mass % relative to the total amount of the cosmetic preparation.
[2] The cosmetic preparation according to [1], wherein a mass ratio of the total amount of the acrylamide-based thickener (a) to the total amount of the tamarind gum (b) is 0.2 to 3.
[3] The acrylamide-based thickener (a) is
(dimethylacrylamide/sodium acryloyldimethyltaurate) crosspolymer,
Acrylamide/2-acrylamido-2-methylpropanesulfonic acid copolymer,
A mixture of polyacrylamide and sodium polyacrylate,
Sodium acrylate/2-acrylamido-2-methylpropanesulfonic acid copolymer,
Polyacrylamide/ammonium acrylamide copolymers, and acrylamide/sodium acrylamide copolymers;
The cosmetic preparation according to [1] or [2], which is one or more types selected from the group consisting of:
[4] The cosmetic preparation according to any one of [1] to [3], further comprising (d) a carboxyvinyl polymer.
[5] The cosmetic according to [4], wherein the blending amount of the carboxyvinyl polymer (d) is 0.01 to 0.5% by mass relative to the total amount of the cosmetic.
[6] The cosmetic preparation according to any one of [1] to [5], further comprising (e) an alkyl-modified carboxyvinyl polymer.
[7] The cosmetic according to [6], wherein the blending amount of the alkyl-modified carboxyvinyl polymer (e) is 0.0005 to 0.5% by mass relative to the total amount of the cosmetic.
[8] The cosmetic preparation according to any one of [1] to [7], further comprising (f) a medicinal component.
[9] The cosmetic preparation according to any one of [1] to [8], further comprising (g) an alkylene oxide derivative.
[10] The cosmetic preparation according to any one of [1] to [9], which is a beauty serum.

The present invention provides a cosmetic product that simultaneously improves many of the characteristics during use, specifically non-stickiness, freshness, smoothness, and adhesion.

The following describes in detail the embodiments of the present invention.

The cosmetic composition according to the present invention contains (a) an acrylamide thickener, (b) tamarind gum, and (c) water as essential ingredients.

（式中、
Ｒ^１、は水素またはメチル基、
Ｒ^２およびＲ^３は、それぞれ独立に、メチル基、エチル基、プロピル基、またはイソプロピル基
を表わす。）
アクリルアミド系増粘剤は、非イオン性コモノマーとイオン性コモノマーとからなるコポリマーであることが好ましい。そして、その非イオン性コモノマーは、上記一般式（１） に示すジアルキルアクリルアミドが好ましい。特に好ましいジアルキルアクリルアミドは、ジメチルアクリルアミド、ジエチルアクリルアミドである。また、それに組み合わせるイオン性コモノマーは、例えば一般式（１）の Ｒ^２またはＲ^３のアルキル基にスルホ基やアンモニウム基が結合したイオン性コモノマーを用いることができる。特に好ましいイオン性コモノマーは、アクリロイルジメチルタウリンナトリウム、２－アクリルアミド－２－メチルプロパンスルホン酸およびそれらの塩である。
非イオン性コモノマーとイオン性コモノマーの重合系におけるモノマー組成比（重合系の仕込み比）は、目的とするアクリルアミド系増粘剤の構造に応じて適宜任意に決定される。非イオン性コモノマーとイオン性コモノマーの重合系の仕込み比（モル比）は、通常、非イオン性モノマー：イオン性モノマー＝０．５：９．５～９．５：０．５ 、好ましくは１：９～９：１、さらに好ましくは７：３～９：１の範囲で共重合に供される。
このようなアクリルアミド系増粘剤は、目的に応じて選択されるが、
（ジメチルアクリルアミド／アクリロイルジメチルタウリンナトリウム）クロスポリマー、
アクリルアミド／２－アクリルアミド－２－メチルプロパンスルホン酸共重合体、
ポリアクリルアミドとポリアクリルナトリウムの混合物、
アクリルナトリウム／２－アクリルアミド－２－メチルプロパンスルホン酸共重合体、
ポリアクリルアミド／アクリルアンモニウム共重合体、および
アクリルアミド／アクリルナトリウム共重合体、
からなる群から選択される１種または２種以上であることが好ましい。これらのうち、（ジメチルアクリルアミド／アクリロイルジメチルタウリンナトリウム）クロスポリマー、またはアクリルアミド／２－アクリルアミド－２－メチルプロパンスルホン酸共重合体がより好ましく、（ジメチルアクリルアミド／アクリロイルジメチルタウリンナトリウム）クロスポリマーが特に好ましい。 [(a) Acrylamide-based thickener]
The cosmetic composition according to the present invention contains an acrylamide thickener. The acrylamide thickener is a water-soluble polymer containing acrylamide as a comonomer. The acrylamide comonomer constituting such a polymer is, for example, a dialkylacrylamide represented by the following general formula:

(Wherein,
R ¹ is a hydrogen atom or a methyl group;
^R2 and ^R3 each independently represent a methyl group, an ethyl group, a propyl group, or an isopropyl group.
The acrylamide thickener is preferably a copolymer consisting of a nonionic comonomer and an ionic comonomer. The nonionic comonomer is preferably a dialkylacrylamide shown in the above general formula (1). Particularly preferred dialkylacrylamides are dimethylacrylamide and diethylacrylamide. The ionic comonomer to be combined therewith may be, for example, an ionic comonomer in which a sulfo group or an ammonium group is bonded to the alkyl group of R ² or R ³ in general formula (1). Particularly preferred ionic comonomers are sodium acryloyldimethyltaurate, 2-acrylamido-2-methylpropanesulfonic acid, and salts thereof.
The monomer composition ratio (feed ratio of the polymerization system) of the nonionic comonomer and the ionic comonomer in the polymerization system is appropriately and arbitrarily determined depending on the structure of the target acrylamide-based thickener. The feed ratio (molar ratio) of the polymerization system of the nonionic comonomer and the ionic comonomer is usually nonionic monomer:ionic monomer=0.5:9.5 to 9.5:0.5, preferably 1:9 to 9:1, and more preferably 7:3 to 9:1, and is used for copolymerization.
Such an acrylamide-based thickener is selected depending on the purpose,
(dimethylacrylamide/sodium acryloyldimethyltaurate) crosspolymer,
Acrylamide/2-acrylamido-2-methylpropanesulfonic acid copolymer,
A mixture of polyacrylamide and sodium polyacrylate,
Sodium acrylate/2-acrylamido-2-methylpropanesulfonic acid copolymer,
Polyacrylamide/ammonium acrylamide copolymers, and acrylamide/sodium acrylamide copolymers;
Among these, (dimethylacrylamide/sodium acryloyldimethyltaurate) crosspolymer or acrylamide/2-acrylamide-2-methylpropanesulfonic acid copolymer is more preferred, and (dimethylacrylamide/sodium acryloyldimethyltaurate) crosspolymer is particularly preferred.

[(b) Tamarind gum]
The cosmetic according to the present invention contains tamarind gum. Tamarind gum is a natural polymeric compound having high viscosity and high transparency, and is typically a polysaccharide having a structure called xyloglucan, in which the main chain is glucose and the side chains are xylose and galactose. Such tamarind gum is generally produced by purifying components extracted from tamarind seeds using warm water or an alkaline aqueous solution.

Various types of tamarind gum are commercially available, and any can be used depending on the purpose. A specific example is Glyloid 6C (manufactured by DSP Gokyo Food & Chemical Co., Ltd.).

[(c) Water]
The cosmetic preparation according to the present invention further contains water in addition to the above-mentioned components. As the water, water used in cosmetics, quasi-drugs, etc., can be used, such as purified water, ion-exchanged water, tap water, etc.

[Amount and ratio of each component]
The cosmetic preparation according to the present invention contains the above-mentioned essential components (a) to (c). If necessary, it may contain other components described below, but the cosmetic preparation according to the present invention contains an acrylamide thickener in an amount of 0.01 to 1% by mass, preferably 0.05 to 0.5% by mass, and more preferably 0.1 to 0.3% by mass, based on the total amount of the cosmetic preparation.

The cosmetic composition according to the present invention can provide a particularly excellent feeling when the blending ratio of tamarind gum to acrylamide-based thickener is within a specific range. Specifically, the mass ratio (a)/(b) of the total amount of acrylamide-based thickener (a) to the total amount of tamarind gum (b) is preferably 0.2 to 3, and more preferably 0.4 to 2.

The cosmetic composition according to the present invention can be combined with other ingredients as necessary, but it is generally preferable that the blending ratio of water is high. Specifically, the blending amount of water is preferably 60% by mass or more, and more preferably 70 to 90% by mass, of the total amount of the cosmetic composition.

[Other additives]
The cosmetic composition according to the present invention may contain various additives as necessary in addition to the above-mentioned components (a) to (c). The components that can be combined are described below.

The cosmetic according to the present invention may further contain (d) a carboxyvinyl polymer. Such a carboxyvinyl polymer is used as a general-purpose thickener for cosmetics, and is a polymer containing acrylic acid as a monomer unit. The carboxyvinyl polymer referred to here is one in which the carboxyl group is not modified, i.e., it is not included in the acrylamide-based thickener (a) or the alkyl-modified carboxyvinyl polymer (e) described below. Such carboxyvinyl polymers are generally commercially available, and are sold under the names Hiviswako (trade name, manufactured by Wako Pure Chemical Industries, Ltd.), Synthalen (trade name, manufactured by 3V SIGMA), Carbopol (trade name, manufactured by Goodrich Chemicals, Inc.), etc. These thickeners are crosslinked polymers having a chemically crosslinked structure. Aqueous dispersions of such crosslinked polymers have a very high thickening effect.

However, in the cosmetic of the present invention, the thickening effect is sufficiently achieved by (a) the acrylamide thickener and (b) the tamarind gum. For this reason, the blended amount of (d) the carboxyvinyl polymer, if blended, is preferably 0.01 to 0.5% by mass, and more preferably 0.03 to 0.3% by mass, based on the total amount of the cosmetic.

The cosmetic composition according to the present invention may further include (e) an alkyl-modified carboxyvinyl polymer. This polymer is an acrylic polymer having a hydrocarbon group. More specifically, it is a polymer or copolymer containing an alkyl acrylate or an alkyl methacrylate as a polymerization unit. This polymer may contain acrylic acid or methacrylic acid without an alkyl group as a polymerization unit. Furthermore, these polymers may be cross-polymers in which they are cross-linked with each other, or polyacrylic acid and an alkyl polyacrylate may be cross-linked. Here, the alkyl group may be linear, branched, or alicyclic. The number of carbon atoms in the alkyl group is not particularly limited, but is preferably 2 to 50, and more preferably 10 to 30.

This (e) alkyl-modified carboxyvinyl polymer serves as an emulsion stabilizer or thickener for the cosmetic, and when it is used, its amount is preferably 0.0005 to 0.5% by mass, and more preferably 0.001 to 0.1% by mass, relative to the total amount of the cosmetic.

The cosmetic composition according to the present invention may further contain (f) a medicinal component. The medicinal component may be selected from conventionally known ones depending on the purpose, and examples of the medicinal component include whitening agents, anti-inflammatory agents, and moisturizing agents. It is preferable that these medicinal components are water-soluble.

Specific examples of such pharmaceutical ingredients include tranexamic acid and its derivatives and salts thereof, glycyrrhizic acid and its derivatives and salts thereof, L-ascorbic acid and its derivatives and salts thereof, alkoxysalicylic acid and its derivatives and salts thereof, glutathione and its derivatives and salts thereof, methoxysalicylic acid and its derivatives and salts thereof, nicotinamide, etc. Of these, tranexamic acid and its derivatives and salts thereof are preferred, with tranexamic acid being particularly preferred.

The cosmetic composition according to the present invention may further contain (g) an alkylene oxide derivative. This alkylene oxide can improve the moisturizing sensation of the skin.

The alkylene oxide derivative (f) that can be used in the cosmetic composition according to the present invention is not particularly limited, but is preferably a compound represented by the following formula (a).
R ^a O-[(AO) _p (EO) _q ]-R ^b (a)
(Wherein,
AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, p and q are the average added mole numbers of oxyalkylene groups and oxyethylene groups having 3 to 4 carbon atoms, respectively, and are 1≦p≦70 and 1≦q≦70, the ratio of oxyethylene groups to the total of oxyalkylene groups and oxyethylene groups is 20 to 80 mass%, the oxyalkylene groups and oxyethylene groups may be added in a block form or in a random form, R ^a and R ^b are each a hydrocarbon group having 1 to 4 carbon atoms or a hydrogen atom which may be the same or different, and the ratio of the number of hydrogen atoms to the number of hydrocarbon groups of R ^a and R ^b is 0.15 or less.

In the compound represented by the above formula (a), AO is an oxyalkylene group having 3 to 4 carbon atoms, such as an oxypropylene group, an oxybutylene group, an oxyisobutylene group, a trimethylene group, or a tetramethylene group, and preferably an oxypropylene group or an oxybutylene group. p is the average number of moles of oxyalkylene groups having 3 to 4 carbon atoms added, and is 1≦p≦70, preferably 2≦p≦20. q is the average number of moles of oxyethylene groups added, and is 1≦q≦70, preferably 2≦q≦20. In addition, (p+q) is preferably 8 to 100.

In addition, in the compound represented by the above formula (a), the ratio of oxyethylene groups to the total of oxyalkylene groups having 3 to 4 carbon atoms and oxyethylene groups is preferably 20 to 80% by mass. The order in which ethylene oxide and alkylene oxide having 3 to 4 carbon atoms are added is not particularly limited. In addition, the oxyethylene groups and oxyalkylene groups having 3 to 4 carbon atoms may be added in a block form or a random form, but are preferably added in a random form. Here, the block form includes not only two-stage blocks but also three-stage blocks.

R ^a and R ^b may be the same, may be a mixture of hydrocarbon groups having 1 to 4 carbon atoms and hydrogen atoms, or may be a mixture of different hydrocarbon groups having 1 to 4 carbon atoms. However, in the hydrocarbon groups of R ^a and R ^b , the ratio of the number of hydrocarbon groups and hydrogen atoms (Y) to the number of hydrocarbon groups (X), Y/X, is 0.15 or less, and preferably 0.06 or less.

Specific examples of alkylene oxide derivatives include polyoxyethylene (10 mol) polyoxypropylene (10 mol) dimethyl ether, polyoxyethylene (9 mol) polyoxypropylene (2 mol) dimethyl ether, polyoxyethylene (14 mol) polyoxypropylene (7 mol) dimethyl ether, polyoxyethylene (6 mol) polyoxypropylene (14 mol) dimethyl ether, polyoxyethylene (15 mol) polyoxypropylene (5 mol) dimethyl ether, polyoxyethylene (25 mol) polyoxypropylene (25 mol) dimethyl ether, polyoxyethylene (9 mol) polyoxybutylene (2 mol) dimethyl ether, polyoxyethylene (14 mol) polyoxybutylene (7 mol) dimethyl ether, polyoxyethylene Examples of the polyoxyethylene ether include ethylene (10 mol) polyoxypropylene (10 mol) diethyl ether, polyoxyethylene (10 mol) polyoxypropylene (10 mol) dipropyl ether, polyoxyethylene (10 mol) polyoxypropylene (10 mol) dibutyl ether, and polyoxyethylene (36 mol) polyoxypropylene (41 mol) dimethyl ether. Among these, polyoxyethylene (9 mol) polyoxypropylene (2 mol) dimethyl ether, polyoxyethylene (14 mol) polyoxypropylene (7 mol) dimethyl ether, and polyoxyethylene (36 mol) polyoxypropylene (41 mol) dimethyl ether are preferred, and polyoxyethylene (14 mol) polyoxypropylene (7 mol) dimethyl ether is particularly preferred.

The alkylene oxide derivatives used in the cosmetic compositions of the present invention can be produced by known methods. For example, they can be obtained by addition polymerization of ethylene oxide and an alkylene oxide having 3 to 4 carbon atoms to a compound having a hydroxyl group, followed by an ether reaction with an alkyl halide in the presence of an alkali catalyst.

When an alkylene oxide derivative is blended in the cosmetic according to the present invention, the blending amount is not particularly limited, but is preferably 0.001 to 5 mass % based on the total mass of the cosmetic, more preferably 0.01 to 3 mass %, and even more preferably 0.1 to 1 mass %.

The cosmetic according to the present invention may contain other additives that can be generally used in cosmetics, provided that the effects of the present invention are not impaired. Examples of such additives include moisturizers, pH adjusters, surfactants, silicone oils, preservatives, chelating agents, stabilizers, colorants, fragrances, and thickeners other than the above-mentioned components. These additives may be blended as appropriate depending on the formulation of the cosmetic.

Any conventionally known moisturizing agent can be used as the moisturizing agent. Examples of such moisturizing agents include polyhydric alcohols and glycol ethers, more specifically, ethylene glycol, diethylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, hexamethylene glycol, isoprene glycol, polyethylene glycol, hyaluronic acid, xylitol, sorbitol, maltitol, and diglycerin (EO)PO adducts.

pH adjusters include commonly used acids or alkalis, such as hydrochloric acid and sodium hydroxide.

The surfactant may be selected from any conventionally known surfactant, but silicone surfactants are preferred. Specific examples include polyether-modified silicones such as PEG-10 dimethicone, cetyl dimethyl copolyol, ralyl PEG-9 polydimethylsiloxyethyl dimethicone, PEG/PPG-19/19 dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, (dimethicone/(PEG-10/15)) crosspolymer, and polysilicone-13.

Examples of silicone oils include linear polysiloxanes (e.g., dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.), cyclic polysiloxanes (e.g., decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), silicone resins that form a three-dimensional network structure, silicone rubbers with an average molecular weight of 200,000 or more, and various modified polysiloxanes (amino-modified polysiloxanes, polyether-modified polysiloxanes, alkyl-modified polysiloxanes, fluorine-modified polysiloxanes, etc.).

Preservatives include phenoxyethanol, chlorphenesin, benzoic acid, salicylic acid, sorbic acid, paraoxybenzoic acid alkyl esters, hexachlorophene, ε-polylysine, etc.

Chelating agents are used to sequester metal ions in cosmetics, and examples of such agents include sodium hexametaphosphate and sodium salt of ethylenediaminetetraacetic acid.

The stabilizer is selected depending on the ingredients to be mixed, but for example, sodium pyrosulfite can be used.

The type of cosmetic of the present invention and the manufacturing method of the cosmetic are not particularly limited. However, since the present invention significantly improves the properties of the cosmetic, such as the feeling of adhesion when used, the preferred embodiment of the cosmetic is a beauty serum.

The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. The blend amounts are shown in mass % unless otherwise specified.

[Examples 1 to 9, Comparative Examples 1 to 7]
Cosmetics of each of the Examples and Comparative Examples were prepared according to the formulations shown in Table 1.

In addition, the performance of these cosmetics was evaluated based on the following criteria: stickiness, freshness, smoothness, adhesion, and stability.

[Sticky]
(Evaluation Method)
Three expert panelists were selected from women in their 30s and 40s who had been trained in sensory evaluation and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to their entire face, and after the product had fully absorbed, they gently rubbed the skin from top to bottom and left to right to evaluate stickiness. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment.
(standard)
A: No sticky feeling B: Almost no sticky feeling C: Slightly sticky feeling D: Sticky feeling E: Very sticky feeling

[Freshness]
(Evaluation Method)
Three expert panelists were selected from women in their 30s and 40s who had been trained in sensory evaluation and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to the entire face, and evaluated the skin condition immediately after application by gently stroking the skin from top to bottom and left to right to evaluate the freshness. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment.
A: Very moist B: Moist C: Slightly moist D: Almost no moist E: No moist

[Smoothness]
(Evaluation Method)
Three expert panelists were selected from women in their 30s and 40s who had been trained in sensory evaluation and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to the entire face, and after it had fully absorbed, they gently stroked the skin from top to bottom and left to right to evaluate the smoothness. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment.
(standard)
A: Feels very smooth B: Feels moderately smooth C: Feels a little smooth D: Feels almost no smoothness E: Feels no smoothness at all

[Close fit]
(Evaluation Method)
Three expert panelists were selected from women in their 30s and 40s who had been trained in sensory evaluation and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to the entire face, tapped the skin immediately after application, and evaluated the adhesion. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment.
(standard)
A: It feels so strong that it sticks to the skin.
B: Feels like it's sticking to the skin C: Feels like it's sticking to a moderate degree D: Feels like it's sticking to the skin a little E: Doesn't feel like it's sticking to the skin

[Stability]
(Evaluation Method)
The cosmetic compositions were stored under low and high temperature conditions, and the condition of the cosmetic compositions was visually inspected and evaluated.
(standard)
Good: No visible change Bad: Gelation occurred

表中、各成分の配合率は質量％である。

In the table, the blending ratio of each component is expressed as mass %.

These results show that all of the cosmetics according to the present invention are excellent in terms of stickiness, freshness, smoothness, adhesion, and stability. It is also clear that increasing the amount of acrylamide-based thickener tends to improve adhesion.

In addition, when the results of the comparative examples are also considered, it is clear that the cosmetic composition according to the present invention achieves excellent effects by using an acrylamide thickener and tamarind gum at the same time, and that the effects of the present invention cannot be obtained by combining a carboxyvinyl polymer or the like. It is also clear that the use of polyethylene glycol instead of an acrylamide thickener can improve the freshness and other aspects of the cosmetic composition, but results in insufficient stability.

Furthermore, the cosmetics of Examples 1 to 3 and 6 to 9 were evaluated for richness (richness) according to the following criteria. The results are shown in Table 2.

[Richness (denseness)]
(Evaluation Method)
Three expert panelists were selected from women in their 30s and 40s who had received training in sensory evaluation and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to the entire face, and evaluated the richness of the skin by gently stroking the skin up, down, left and right before the product was absorbed into the skin. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment.
(standard)
A: Strongly full-bodied taste B: Full-bodied taste C: Moderately full-bodied taste D: Slightly full-bodied taste E: No full-bodied taste

表中、各実施例の主要成分のみを記載し、添加剤および水の配合率については省略した。

In the table, only the main components of each example are shown, and the blending ratios of additives and water are omitted.

These results show that increasing the amount of acrylamide thickener tends to improve the richness of the flavor.

Claims (6)

(a) an acrylamide-based thickener,
(b) tamarind gum,
(c) water,
(d) a carboxyvinyl polymer, and
(e) Alkyl-modified carboxyvinyl polymer
A cosmetic comprising:
The acrylamide-based thickener (a) is a (dimethylacrylamide/sodium acryloyldimethyltaurate) crosspolymer,
the blending amount of the acrylamide-based thickener is 0.01 to 1% by mass relative to the total amount of the cosmetic;
a mass ratio of the total amount of the acrylamide-based thickener (a) to the total amount of the tamarind gum (b) is 0.2 to 3 . The cosmetic according to claim 1 , wherein the blending amount of the carboxyvinyl polymer (d) is 0.01 to 0.5% by mass based on the total amount of the cosmetic. The cosmetic according to claim 1 or 2 , wherein the amount of the alkyl-modified carboxyvinyl polymer (e) is 0.0005 to 0.5% by mass based on the total amount of the cosmetic. The cosmetic preparation according to any one of claims 1 to 3 , further comprising (f) a medicinal ingredient. (g) a compound represented by the following formula (a):
R ^a O-[(AO) _p (EO) _q ]-R ^b (a)
(Wherein,
AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, p and q are the average number of moles of oxyalkylene groups and oxyethylene groups added, respectively, having 3 to 4 carbon atoms, and are 1≦p≦70 and 1≦q≦70, the ratio of oxyethylene groups to the total of oxyalkylene groups and oxyethylene groups is 20 to 80 mass%, the oxyalkylene groups and oxyethylene groups may be added in a block form or in a random form, R ^a and R ^b are each a hydrocarbon group having 1 to 4 carbon atoms or a hydrogen atom which may be the same or different, and the ratio of the number of hydrogen atoms to the number of hydrocarbon groups of R ^a and R ^b is 0.15 or less.
The cosmetic preparation according to any one of claims 1 to 4 , further comprising an alkylene oxide derivative represented by the formula: The cosmetic preparation according to any one of claims 1 to 5 , which is a beauty serum.