JP2000309512A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cosmetic excellent in sense of touch and persistence of film on hair or skin by including a specific amphoteric copolymer and a specific compound. SOLUTION: This cosmetic includes (A) an amphoteric copolymer including a unit expressed by formula I [e.g.; N-(meth)acryloyloxyethyl N,N- dimethylammonium N-methylcarboxylate etc.], and a unit expressed by formula II (R1 is H or methyl; R2 and R5 are each a 1-4C alkylene; R3 and R4 are each a 1-C alkyl; X is oxygen atom or imino group; Y is COO, PHO3 or SO3; R6 is a 1-24C alkyl), having 10,000-500,000 weight average molecular weight and (B) a compound having plural OH groups (e.g.; glycerin or the like), in 3/1-1/5 weight ratio of the component B/component A. The component A optionally includes <=55 wt.% of other unit such as acrylonitrile or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a film-forming cosmetic. More specifically, the present invention relates to a cosmetic having low rigidity, high flexibility, and excellent feeling in use.

[0002]

2. Description of the Related Art Examples of film-forming cosmetics include setting agents containing various film-forming polymer compounds for hair styling for adjusting and maintaining a hairstyle, and for skin for improving makeup durability. Cosmetics are widely used. Examples of such a film-forming polymer compound include acrylic acid,
Anionic copolymers containing a neutralized vinyl carboxylic acid such as methacrylic acid or crotonic acid as a hydrophilic component
No. 14647, Japanese Unexamined Patent Publication No. Hei 3-20603, etc.)
And nonionic copolymers containing vinylpyrrolidone or the like as a hydrophilic component are used.

[0003] However, the coating formed from such a high molecular compound has a rough feel and cannot provide a natural tactile feeling when used on the hair, or has a feeling of tightness or discomfort when used on the skin. Often. When a humectant or the like is used in combination to solve this problem, the feeling of stickiness or oiliness appears, or the ability to form a film is impaired, or the durability of the set is insufficient even if the stiffness and tightness are resolved. And the original purpose is not achieved.

[0004]

When used on hair, there is no feeling of stickiness or stickiness, and it has a natural elasticity and tactile sensation and excellent set continuity. Provide cosmetics that can form a film with excellent feeling without discomfort and stickiness, and more specifically, a polymer that can form a film with low rigidity, flexibility, elasticity, and excellent resilience. The provision of cosmetics based on compounds and emollients is a problem to be solved by the present invention.

[0005]

Means for Solving the Problems The present inventors have conducted various studies in order to solve the above-mentioned problems, and as a result, by using a specific amphoteric copolymer and a specific compound in combination, excellent tactile sensation has been obtained. In addition, the present inventors have found that a cosmetic having good durability of the film on hair and skin can be obtained, and completed the present invention. That is, the gist of the present invention is that a weight-average molecular weight of 10,000 containing (A) (a) an amphoteric structural unit represented by the general formula (1) and (b) a structural unit represented by the general formula (2). ~ 500,
000 amphoteric copolymer (hereinafter referred to as “component (A)”)
And (B) a compound having a plurality of hydroxyl groups in one molecule (hereinafter referred to as “component (B)”), and the weight ratio of component (B) to component (A) is (B) / ( A) = 3/1 to 1
/ 5 of cosmetics.

[0006]

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[0007]

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Wherein R ¹ is a hydrogen atom or a methyl group,
R ² and R ⁵ are each an alkylene group having 1 to 4 carbon atoms, R ³ and R ⁴ are each an alkyl group having 1 to 4 carbon atoms, X is an oxygen atom or imino (NH) group, and Y is COO.
Group, a ₃ group or SO ₃ group PHO, R ⁶ is an alkyl group having 1 to 24 carbon atoms.

Another gist of the present invention is that the cosmetic wherein the X of the structural unit (a) in the component (A) is an oxygen atom, wherein the component (A) is represented by (a) a general formula (1). The above cosmetic, which is a copolymer containing 35 to 90% by weight of the amphoteric structural unit and (b) 65 to 10% by weight of the structural unit represented by the general formula (2), and the component (A) are represented by the general formula: In addition to the amphoteric structural unit represented by (1) and the structural unit represented by the general formula (2), (c) the above-mentioned cosmetic which is a copolymer containing 55% by weight or less of other structural units is present. are doing.

Another aspect of the present invention resides in the above-mentioned cosmetic wherein the component (B) is at least one compound selected from glycerin derivatives, saccharide derivatives and aliphatic diols. Another aspect of the present invention resides in hair cosmetics and skin cosmetics based on the above-mentioned cosmetics.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In the present invention, the amphoteric copolymer used as the component (A) is essentially composed of (a) the amphoteric structural unit represented by the general formula (1) and (b) the structural unit represented by the general formula (2). It is a structural unit, and (c) includes other structural units as necessary. In the present invention, a copolymer having the above constitutional unit can be obtained by copolymerizing a monomer having a corresponding unsaturated double bond capable of forming these units.

The monomer capable of forming the amphoteric structural unit represented by the general formula (1) of (a) includes acrylic acid or methacrylic acid having an amphoteric ionic group (hereinafter collectively referred to as “(meth) acrylic acid”). In addition, acrylate and methacrylate are collectively described as “(meth) acrylate”, acryloyl and methacryloyl are collectively described as “(meth) acryloyl”, and acryl and methacryl are collectively described as “(meth) acryl”. it can.

Specifically, N- (meth) acryloyloxyethyl N, N-dimethylammonium N-methylcarboxylate, N- (meth) acryloylaminopropyl N, N-dimethylammonium N-methylcarboxylate, (Meth) acryloyloxyethyl N,
N-diethyl ammonium N-propane sulfonate and the like can be mentioned. In particular, it is preferable to use N- (meth) acryloyloxyethyl N, N-dimethylammonium N-methylcarboxylate since the texture when used as a cosmetic is excellent.

Further, the above-mentioned amphoteric structural unit is obtained by polymerizing using an amine derivative or amide derivative of (meth) acrylic acid as a monomer as shown in the following formula (3) and then amphoteric. It can also be obtained by amphoteric ionization with an agent.

[0015]

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In the formula, R ^{1 to} R ⁴ and X each represent the same atom or group as in the above formula (1). Examples of such a monomer include dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, diethylaminomethyl (meth) acrylate, dimethylaminoethyl (meth) acrylamide, and diethylaminopropyl (meth) acrylamide. No.

Examples of the amphoteric agent include sodium monobromoacetate, potassium monochloroacetate, lithium monochloropropionate, or monochloroacetic acid and ammonia, 2-amino-2-methyl-1-propanol, or triethanolamine. Salts of monohalogenated fatty acids such as neutralized products of the above; lactones such as propiolactone; sultones such as propane sultone; phosphites such as propiophosphite.

The content ratio of the (a) amphoteric structural unit in the component (A) is preferably from 35 to 90% by weight. If the proportion is less than 35% by weight, stickiness tends to occur or the restoring force tends to be insufficient when used as a cosmetic in combination with the component (B), while if it exceeds 90% by weight, the component (A) There are problems in that the material itself tends to absorb moisture, giving a sticky feeling, and the hair setting power under high-temperature and high-humidity conditions tends to be insufficient.

The unit (b), which is another structural unit of the component (A) used in the present invention, is represented by the general formula (2): (meth) acrylic acid having an alkyl group having 1 to 24 carbon atoms. It is derived from an alkyl ester. Specific examples of such alkyl (meth) acrylates include, for example, methyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate,
Examples include tert-butyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, oleyl (meth) acrylate, and the like.

The content of the structural unit (b) represented by the general formula (2) in the component (A) is preferably from 10 to 65% by weight. If this proportion is less than 10% by weight, the moisture absorption of the component (A) becomes high, and the moisture resistance tends to be inferior, and problems such as stickiness tend to occur. 65% by weight
If the ratio exceeds the range, the elasticity and the restoring force tend to be insufficient.

In the present invention, in addition to the above-mentioned essential constituent units ((a) and (b)) as constituent units of component (A), (c) other constituent units may be contained up to 55% by weight. No problem. Such a structural unit is selected and used in accordance with the type thereof for the purpose of imparting flexibility, hardness and the like to the copolymer of the component (A). Examples of the monomer capable of providing such a structural unit include acrylonitrile, hydroxyethyl (meth) acrylate, butoxyethyl (meth) acrylate, benzyl (meth) acrylate, cyclohexyl (meth) acrylate, dimethylaminoethyl (meth) ) Acrylate, tetrahydrofurfuryl (meth) acrylate, ethylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, propylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, 1,3-butylene glycol di (meth) acrylate And (meth) acrylic derivatives such as diacetone (meth) acrylamide; and aromatic unsaturated monomers such as styrene, chlorostyrene and vinyltoluene.

The content of the component (A) in the component (A) is preferably not more than 55% by weight.
~ 45% by weight is more preferred. If this proportion exceeds 55% by weight, the properties of component (A), such as flexibility and elasticity, tend to be insufficient. If the content is less than 5% by weight, the purpose of introducing this structural unit is often not sufficiently achieved. The amphoteric copolymer of the component (A) is obtained by subjecting a monomer component capable of giving each structural unit as described above to solution polymerization, bulk polymerization, emulsion polymerization and suspension polymerization, usually in the presence of a radical polymerization initiator. It can be obtained by polymerizing by a method such as polymerization.

Among these polymerization methods, a solution polymerization method is preferable. For example, after dissolving each monomer component in a solvent, a polymerization initiator is added, and the mixture is heated and stirred under a nitrogen stream. The polymerization can be carried out in a manner. Solvents that can be used in the solution polymerization method include water; alcohols such as methanol, ethanol, isopropanol, ethylene glycol, and butyl cellosolve; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone; acetic acid such as methyl acetate and ethyl acetate. One or a mixture of two or more esters may be used. The amount of the solvent used is such that the resulting polymer solution has a polymer concentration of 10 to 65.
It is good to be an amount that will be% by weight.

Examples of the radical polymerization initiator that can be used in the above polymerization include 2,2'-azobisisobutyronitrile (AIBN) and 2,2'-azobis (2,2
4-dimethylvaleronitrile), 2,2'-azobis (4-methoxy-2,4-dimethylvaleronitrile),
Dimethyl-2,2'-azobisisobutyrate, 2,
2'-azobis (2-methylbutyronitrile), 1,
1'-azobis (1-cyclohexanecarbonitrile)
And peroxides such as benzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide and lauroyl peroxide. These polymerization initiators are usually used in an amount of 0.01 to 5% by weight based on the monomer components.

The polymerization is usually carried out in an atmosphere of an inert gas such as nitrogen or argon at 30 to 120 ° C., preferably 40 to 100 ° C.
For 1 to 20 hours. Generally, all kinds and amounts of the monomers are present from the beginning of the polymerization, but they may be added in portions depending on the kind and / or the amount of the monomers.

The weight average molecular weight of the amphoteric copolymer of the component (A) used in the present invention is from 10,000 to 500,000.
Must be in the range of 00. Weight average molecular weight of 10,
If it is less than 000, the shape retention of the film tends to be insufficient, while if it exceeds 500,000, the solubility in water is reduced or the solution viscosity is increased, so that it is used as a cosmetic. This may cause problems. The molecular weight of the copolymer is controlled by the polymerization temperature, the type and amount of the polymerization initiator, the amount of a chain-transferring solvent such as ethanol and isopropanol, and the amount of a chain transfer agent such as butyl mercaptan and lauryl mercaptan. The polymerization can be carried out by appropriately selecting polymerization conditions such as

As described above, the amphoteric copolymer used as the component (A) in the present invention may be a precursor of an amine derivative of (meth) acrylic acid or an amide, instead of the zwitterionic unsaturated monomer. It can also be obtained by copolymerizing using a derivative and then amphoterating using an amphoteric agent. The amount of the amphoteric agent used at this time is 70 to stoichiometric.
130 mol% is preferred. In this amphoteric reaction, when an amphoteric agent that produces a by-product salt such as sodium monobromoacetate or potassium monochloroacetate is used as the amphoteric agent, if necessary, the by-product salt is filtered, centrifuged, or the like. Separation and removal can be performed, and further, dissolved salts can be removed by ion exchange treatment (see JP-A-55-104209 and JP-A-61-258804).

The amphoteric copolymer obtained by these various methods may be used as it is when obtained as a solution, or may be used as a solid by removing the solvent or by precipitation of the polymer in a poor solvent. You may use it after obtaining a polymer. If necessary, purification may be performed by reprecipitation, solvent washing, or the like. In particular, when the copolymer is odorous, in the case of a solution, the odor is removed by azeotropic removal of the odor component with a solvent or by treatment with an adsorbent such as activated carbon, zeolite, or activated clay. be able to. When the copolymer is a solid, a reduced pressure treatment under heating or an extraction treatment with a solvent such as ether may be performed.

By adding a compound having a plurality of hydroxyl groups in one molecule of the component (B) to the amphoteric copolymer of the component (A), the film forming property of the amphoteric copolymer of the component (A) can be improved. Without hindering, the rigidity of the obtained film is reduced, and flexibility is given, so that a flexible film having a restoring force can be formed. Examples of the compound that can be used as the component (B) include a glycerin derivative, a saccharide derivative, and an aliphatic diol.

Examples of such compounds include glycerin derivatives such as glycerin, diglycerin, and tetraglycerin fatty acid esters. Examples of saccharide derivatives include monosaccharides such as maltitol and sorbitol, disaccharides, and sugar alcohols. Examples of the aliphatic diols include ethylene glycol, propylene glycol, 1,3-butanediol, and 1,4-butanediol. These compounds may be used alone or in combination of two or more. Among them, glycerin, polyglycerin, polyglycerin fatty acid ester, maltitol and sorbitol can be preferably used in terms of texture and safety.

It is preferable to use a liquid component at room temperature as the component (B) because it has a large softening effect and is effective for reducing the feeling of stiffness and unpleasantness to the skin. As the structure of the compound of the component (B), it is preferable that a plurality of hydroxyl groups are present close to each other because the resilience of a formed film is improved. Particularly preferred is a structure in which a hydroxyl group is bonded to adjacent carbon atoms. If the number of hydroxyl groups of the compound of the component (B) is less than 2, the ability to form a film when used as a cosmetic is reduced, and its restorability is poor, and the film is likely to be deformed or broken. The durability of the hair set becomes insufficient, and dirt and cracks on the surface of the skin are likely to occur. Also,
The preferred number of hydroxyl groups is 100 or less, more preferably 3
0 or less. If the number of hydroxyl groups is too large, a sticky feeling may appear.

In the cosmetic of the present invention, the weight ratio of the component (A) and the component (B) is (B) / (A) =
It needs to be in the range of 3/1 to 1/5. When this ratio exceeds 3/1 and the content of the component (B) is large, the sticky feeling is increased and the tactile sensation is deteriorated, and the strength of the coating is reduced, the elasticity / restorability is reduced, and the durability of the coating is increased. Will be damaged. On the other hand, when the proportion of the component (B) is reduced such that the proportion is less than 1/5, the softening effect by the component (B) becomes insufficient, and it becomes difficult to obtain a natural feel and texture.

The content of the component (A) and the component (B) in the cosmetic is not particularly limited, but the component (A) is 0.1 to 10% by weight of the whole, preferably 0.5 to 10% by weight. 7% by weight
In general. Further, when a silicone derivative such as dimethylpolysiloxane, methylphenylpolysiloxane, polyether-modified silicon, and amino-modified silicon is added to the cosmetic of the present invention, stickiness is further reduced, and smoothness is more preferably improved. It is preferable because a tactile sensation is obtained. The use amount of such a silicon derivative is preferably 0.01 to 40% by weight, more preferably 0.02 to 10% by weight in the cosmetic.

In the cosmetic of the present invention, in addition to the above-mentioned essential components (A) and (B), components used in ordinary cosmetics, for example, castor oil, cacao oil, mink oil , Avocado oil, jojoba oil, macadamian nut oil,
Fatty acid glycerides such as olive oil; waxes such as lanolin; esters such as isopropyl myristate, octyldodecyl myristate, hexyl laurate, and cetyl lactate; cetyl alcohol, oleyl alcohol, stearyl alcohol, isostearyl alcohol, lauryl alcohol, 2- Linear and branched higher alcohols such as octyldodecanol; linear and branched higher fatty acids such as lauric acid, stearic acid, myristic acid and oleic acid; polyoxyethylene lauryl ether, polyoxypropylene cetyl ether, polyoxy Ethylene oxide and / or propylene oxide adducts of higher alcohols such as ethylene polyoxypropylene stearyl ether;
Amides such as oleic acid diethanolamide and lauric acid diethanolamide; cationic surfactants such as stearyltrimethylammonium chloride, distearyldimethylammonium chloride and lauryltrimethylammonium chloride; polyoxyethylene lauryl ether sulfate and polyoxyethylene lauryl sulfosuccinate Anionic surfactants such as imidazoline type, alkyl betaine type, and amine oxide type; protein derivatives such as collagen hydrolyzate, keratin hydrolyzate, and polyamino acid; amino acid derivatives;
Plant extracts, crude drugs, vitamins, ultraviolet absorbers such as oxybenzene, chelating agents such as ethylenediaminetetraacetic acid sodium salt, preservatives such as parabens, antioxidants, pigments,
Pigments, fragrances, and the like may be appropriately blended within a range that does not impair the effects of the present invention. In addition, various commonly used cationic, anionic, nonionic, amphoteric and other natural polymers and modified products thereof, and synthetic polymers are used in combination within a range that does not reduce the performance of the cosmetic of the present invention. be able to.

The use and form of the cosmetic of the present invention are not particularly limited, and can be used in various forms. For example, as a hair cosmetic such as hair foam, aerosol hair spray, pump hair spray, foam hair spray, hair mist, gel, set lotion, hair cream, hair oil, or cream, emulsion, lotion, sunscreen, hand It can be used as skin cosmetics such as lotions and packs, and makeup cosmetics such as foundations, mascaras, eyebrows, and lipsticks. The cosmetic of the present invention is manufactured by dissolving, emulsifying, or dispersing the components including the components (A) and (B) in water and / or a solvent of alcohols such as ethanol and isopropanol according to a conventional method. Can be.

When used as a foam, an aerosol spray, a foam spray, or the like, the propellant is a liquefied alkane such as a fluoroalkane such as 1,1-difluoroethane or 1,1,1,2-tetrafluoroethane; Compressed gas such as petroleum gas; dimethyl ether; carbon dioxide gas and nitrogen gas can be used alone or in combination.

[0037]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention. Parts and% in Examples are parts by weight and% by weight unless otherwise specified.

<Synthesis of amphoteric copolymer (component (A))> 50 parts of N, N-dimethylaminoethyl methacrylate was placed in a reactor equipped with a reflux condenser, a dropping funnel, a thermometer, a nitrogen gas inlet tube and a stirrer. , 30 parts of methyl methacrylate,
After charging 20 parts of isobutyl methacrylate and 150 parts of absolute ethanol, 0.6 part of 2,2'-azobisisobutyronitrile was added, and the mixture was heated to 80 ° C. under a nitrogen atmosphere and reacted for 2 hours. 0.6 parts of 2,2'-azobisisobutyronitrile was added, and the reaction was continued for 6 hours.

Next, a 40% anhydrous ethanol suspension of N, N-dimethylaminoethyl methacrylate and equimolar potassium hydroxide neutralized monochloroacetic acid was added to the reactor using a dropping funnel, and the mixture was added under a nitrogen stream. 12 at 80 ° C
A time amphoteric reaction was performed. The resulting viscous suspension was filtered through a filter, and the filtrate was passed through a column filled with a regenerated cation exchange resin ("Diaion PK-220", the system of which was replaced with anhydrous ethanol after regeneration). And then the regenerated anion exchange resin ("Diaion PA-41
After regeneration, the mixture was passed through a column filled with anhydrous ethanol, and 240 parts of an amphoteric polymer solution was obtained. The polymer thus obtained is referred to as "P-1". An aliquot of this polymer solution was taken, dried under reduced pressure at 80 ° C. for 4 hours, and the concentration of the active ingredient determined by weighing the residue after removing the solvent was 30% by weight. The weight average molecular weight of the polymer measured by gel permeation chromatography using polystyrene as a standard substance was 70,0.
00.

<Examples 1 to 5, Comparative Examples 1 to 4> An aqueous hairdressing composition was prepared according to the composition shown in Table 1 (Example) and Table 2 (Comparative Example), and evaluated by the following method. Carried out. The results are shown in Tables 1 and 2. <Evaluation method> The evaluation method and evaluation criteria are as follows.
All evaluations were performed under the conditions of 23 ° C. and 60% RH. (1) Rigidity (Young's modulus) The sample was naturally dried in a Teflon dish for 24 hours to prepare a film having a thickness of 250 ± 50 μm. The film was cut into a strip having a width of 5 mm and a length of 20 mm to obtain a test piece. A tensile test was performed at a tensile speed of 20 mm / min, and the Young's modulus was measured.

[0041] (2) residual strain (1) and the same way created 5mm wide film was cut into a 40mm long strip, the test strip with the the indicia as seen 20mm spacing (L _O) Created. This test piece was stretched at a rate of 20 mm / min to a length of 80 mm (strain 100%), held for 1 minute, immediately after the load was removed, and the test piece was placed on a flat table. The distance L was measured. The residual strain was calculated by the following equation.

[0042]

## EQU1 ## 100 × (L−L ₀ ) / L ₀

(3) Flexibility A sample was applied to a hair bundle of 23 cm in length and 2 g and squeezed lightly.
It was wound around a rod having a diameter of 12 mm, dried at 50 ° C. for 2 hours, and left at 23 ° C. and 60% RH for 24 hours. Thereafter, the bristle bundle was removed from the rod, one end thereof was hung to measure the initial length of curl (H ₀ ), and then a weight having a weight of 10 g was hung at the tip of the hair, and the curl length (H ₂ ) was measured. . The curl deformation was calculated by the following equation. It can be determined that the greater the amount of deformation, the higher the flexibility.

[0044]

## EQU2 ## 100 × (H ₂ −H ₀ ) / H ₀

(4) Gowatsuki A sample was applied to a hair bundle of 23 cm in length and 2 g and squeezed lightly.
It was adjusted to a width of 20 mm on a flat table, dried at 50 ° C. for 2 hours, and left at 23 ° C. and 60% RH for 24 hours. Thereafter, the bristle bundle was placed horizontally on a support having a spacing of 65 mm, and the maximum load (g) when the central portion of the bristle bundle was pushed and bent at a speed of 20 mm / min was measured.

(5) Stickiness (Finishing of Finished Hair) A sample was applied to a hair bundle of 23 cm in length and 2 g and squeezed lightly.
Dry at 50 ° C. for 2 hours and 24 ° C. at 23 ° C. and 60% RH.
After standing for a while, the stickiness was sensory evaluated according to the following criteria. ：: Stickiness is not felt. Δ: There is some stickiness. X: Very sticky.

Example 6 A skin cosmetic composition of the present invention was prepared according to the following composition. When the obtained cosmetic was applied to the skin, a film having no uncomfortable feeling even after drying and having a smooth feeling without stickiness was obtained. (Composition) (A) Resin P-1 (30% solution) 15.0% (B) Glycerin 4.0% Polyether-modified silicon (1) 0.3% Water Remainder (1) SH3771C (manufactured by Toray Dow Corning) )

[0048]

[Table 1]

[0049]

[Table 2]

<Evaluation of Results> An amphoteric copolymer (P-1) as the component (A) and a compound having a plurality of hydroxyl groups in one molecule of the component (B) (glycerin, maltitol, decaglycerin monooleate) (Examples 1 to 5) having the constitution of the present invention, and the case where the component (B) is not contained (Comparative Examples 1 and 2) or the polymerization ratio of the component (B) and the component (A) is Comparing the cases outside the range of the present invention (Comparative Examples 3 and 4), it can be seen that the hair cosmetic of the present invention is flexible and excellent in restoring property, and has less stiffness and stickiness. Also,
From Example 6, it can be seen that excellent performance was exhibited when used as a skin cosmetic.

[0051]

EFFECT OF THE INVENTION The cosmetic composition of the present invention is excellent in flexibility, elasticity and set retention for hair and skin, and can form a supple and non-sticky film having an excellent touch.

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Claims (7)

[Claims] 1. A weight-average molecular weight of 10,000 to 50 containing (A) (a) an amphoteric structural unit represented by the general formula (1) and (b) a structural unit represented by the general formula (2).
(B) a compound having a plurality of hydroxyl groups in one molecule (hereinafter, referred to as “component (B)”), and The weight ratio of component (B) to component (A) is (B) / (A) = 3/1 to 1 /
Cosmetics in range 5. Embedded image Embedded image In the formula, R ¹ is a hydrogen atom or a methyl group, R ² and R ⁵ are each an alkylene group having 1 to 4 carbon atoms, R ³ and R ⁴ are each an alkyl group having 1 to 4 carbon atoms, and X is an oxygen atom Or imino (NH) group, Y is COO group, PHO ₃ group or S
An O ₃ group, and R ⁶ is an alkyl group having 1 to 24 carbon atoms. 2. The cosmetic according to claim 1, wherein X of the structural unit (a) in the component (A) is an oxygen atom. 3. Component (A) comprising (a) 35 to 90% by weight of an amphoteric structural unit represented by the general formula (1) and (b) 65 to 10% by weight of a structural unit represented by the general formula (2). The cosmetic according to claim 1, which is a copolymer containing: 4. Component (A) contains 55% by weight or less of (c) other structural units in addition to the amphoteric structural units represented by the general formula (1) and the structural units represented by the general formula (2). The cosmetic according to claim 3, which is a copolymer contained. 5. The method according to claim 1, wherein the component (B) is a glycerin derivative,
The cosmetic according to any one of claims 1 to 4, wherein the cosmetic is at least one compound selected from saccharide derivatives and aliphatic diols. 6. The hair cosmetic according to claim 1, wherein the cosmetic is a hair cosmetic. 7. The skin cosmetic according to claim 1, wherein