JPH0995584A - Gel composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily obtain a gel compsn. which is excellent in gel- forming roperties, exhibits a high moisture retention without requiring the addition of a humectant, and remarkably improves rough skin by compounding a carboxylated vinyl polymer with a low-molecular betaine, as an ampholyte. SOLUTION: This compsn. contains a carboxylated vinyl polymer and a low-molecular betaine. Pref. the betaine is a quaternary ammonium salt represented by the formula (wherein R<1> , R<2> , and R<3> are each independently a 1-6C alkyl; and (n) is 0 or a positive integer provided that the total of (n) and the numbers of carbon atoms of R<1> to R<3> is 8 or lower). The compsn. pref. contains 0.01-5wt.% carboxylated vinyl polymer and 0.01-30wt.% low- molecular betaine.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a gel composition,
More specifically, the present invention relates to a gel composition having excellent gel forming properties, high moisturizing effect, and excellent skin roughening improving effect.

[0002]

2. Description of the Related Art Carboxyvinyl polymers have been conventionally used as a base material for gel-like products in the fields of cosmetics, pharmaceuticals and the like. In this case, it was necessary to neutralize the carboxyvinyl polymer with a basic substance to obtain the gel composition. In addition to this, in order to obtain a gel composition further imparting a moisturizing effect, a rough skin improving effect, etc., a moisturizing agent such as glycerin and other components must be added.
Therefore, in order to manufacture a gel base material having an appropriate viscosity and also a moisturizing effect and a rough skin improving effect, the number of manufacturing steps is increased, and the manufacturing method is complicated.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and is excellent in gel forming property, high in moisturizing effect, excellent in rough skin improving effect, and capable of easily producing a gel base material. It is an object to provide a gel composition.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that by combining a carboxyvinyl polymer with a low molecular weight betaine, which is an ampholyte, it has excellent gel-forming properties. Moreover, they have found that a gel composition having a high moisturizing effect and an excellent skin roughening improving effect can be easily obtained without adding a moisturizing agent or the like, and thus completed the present invention.

That is, according to the present invention, there is provided a gel composition containing a carboxyvinyl polymer and low molecular weight betaine.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The gel composition of the present invention will be described in detail below.

The carboxyvinyl polymer used in the present invention is an acrylic acid polymer, specifically, Carbopol 940 (registered trademark of BF Goodrich Chemical Co., USA), Carbopol 941 (the same), It is commercially available as Hibiswako 104 (registered trademark of Wako Pure Chemical Industries, Ltd.), Hibiswako 105 (the same), and is commercially available.

The carboxyvinyl polymer is preferably incorporated in the gel composition of the present invention in a proportion of 0.01 to 5% by weight, more preferably 0.05 to 2% by weight.
If it is less than 0.01% by weight, it is difficult to obtain a sufficient viscosity as a gel composition, while if it exceeds 5% by weight, the viscosity is too high as a gel composition and stickiness is noticeable from the viewpoint of usability. Not preferable.

The low molecular weight betaine used in the present invention may include those having a molecular weight of 200 or less and forming a zwitterion with an inner salt of a quaternary ammonium salt group, a sulfonium salt group, a phosphonium salt group or the like. The reason for setting the molecular weight to 200 or less is that betaine having a molecular weight of more than 200 has properties as a surfactant and tends to roughen the skin. In the present invention, among these low molecular weight betaines, the following general formula (I)

[0010]

Embedded image (In the formula, R ¹ , R ² and R ³ each independently represent an alkyl group having 1 to 6 carbon atoms; n represents 0 or a positive integer; provided that the carbon number of R ¹ , R ² and R ³ is And the sum of n and n is 8 or less) are preferably used.

In the above general formula (I), the total number of carbon atoms and n is 9 or more, and the nitrogen atom and the alkyl groups (R ¹ , R ² and R ³ ) and (CH ₂ ) bonded to the nitrogen atom. _When the molecular weight of the _{n + 1} portion becomes relatively large, the hydrophobicity of the above portion increases, and as a result, the property of the quaternary ammonium salt as an amphoteric surfactant tends to be manifested, which is not preferable.

R ¹ , R ² and R ³ have 1 carbon atom
A wide range of straight or branched chain alkyl groups of ~ 6 can be used. That is, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec
-Butyl group, tert-butyl group, pentyl group, isopentyl group, neopentyl group, tert-pentyl group, hexyl group, isohexyl group, 3-methylpentyl group,
Examples thereof include a 2,2-dimethylbutyl group and a 2,3-dimethylbutyl group. These R ¹ , R ² and R ³
May be the same or different.

As a combination of the above alkyl groups, R
^By reducing the carbon number of ¹ , R ² and R ³ as much as possible, the property of the quaternary ammonium salt represented by the general formula (I) as an amphoteric surfactant can be reduced as much as possible. It is preferable in that there is a tendency. That is, in the above general formula (I), trimethylglycine in which R ¹ , R ² and R ³ are all methyl groups and n is 0 is most preferably used. In the above general formula (I), R
^A γ-butyrobetaine in which ¹ , R ² and R ³ are all methyl groups and n is 2 is also preferably used.

The low molecular weight betaine is preferably blended in the gel composition of the present invention in a proportion of 0.01 to 30% by weight, more preferably 0.1 to 20% by weight. 0.0
If it is less than 1% by weight, the effect of the present invention is not sufficiently exhibited, while if it exceeds 30% by weight, the effect corresponding to the increase of the compounding amount cannot be expected.

The gel composition of the present invention may include cosmetics, pharmaceuticals, quasi drugs and the like, all of which are applied to the outer skin.

Further, the gel composition of the present invention comprises an aqueous solution system,
Solubilization system (eg lotion), emulsion system (eg emulsion,
(Eg cream) and ointment-based external preparations for skin.

The gel composition of the present invention may contain various components generally used in gel substrates for cosmetics, pharmaceuticals and the like within a range that does not impair the effects of the present invention. Examples of such components include fats and oils, waxes, ester oils, hydrocarbon oils, silicones, surfactants, lower alcohols,
Examples thereof include sterols, moisturizers, water-soluble polymers, ultraviolet absorbers, sequestering agents for metal ions, pH adjusters, neutralizing agents, antioxidants, antibacterial agents, drugs, and various extracts.

Examples of the oils and fats are linseed oil, camellia oil, macadamia nut oil, corn oil, mink oil, olive oil, avocado oil, sasanqua oil, castor oil, safflower oil, kyounin oil, cinnamon oil, jojoba oil, grape oil,
Sunflower oil, almond oil, rapeseed oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil, egg yolk oil, cattle leg oil, liver oil, triglycerin, Liquid oils and fats such as glyceryl trioctanoate and glycerin triisopalmitate; Liquid or solid oils and fats such as coconut oil, palm oil and palm kernel oil; cacao butter, beef tallow,
Sheep fat, pork fat, horse fat, hydrogenated oil, hydrogenated castor oil, mokuro,
Solid fats and oils such as shea butter are exemplified.

Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ivorot wax, whale wax, montan wax, nuka wax, lanolin,
Examples include reduced lanolin, hard lanolin, kapok wax, sugar cane wax, jojoba wax, shellac wax and the like.

As the ester oil, octanoic acid esters such as cetyl octanoate; isooctanoic acid esters such as glycerin tri-2-ethylhexaenoate and pentaerythritol tetra-2-ethylhexanoate; lauric acid such as hexyl laurate Esters; isopropyl myristate, octyl dodecyl myristate, etc. myristic acid esters; octyl palmitate, etc. palmitic acid esters; isocetyl stearate, etc. stearic acid ester; propyl isostearate, etc. isostearic acid ester; isopalmitic acid octyl, etc. Palmitic acid ester; oleic acid ester such as isodecyl oleate; adipic acid diester such as diisopropyl adipate; sebacic acid diester such as diethyl sebacate;
Examples include diisostearyl malate and the like.

Examples of the hydrocarbon oil include oils such as liquid paraffin, ozokerite, squalane, squalene, pristane, paraffin, isoparaffin, ceresin, petrolatum and microcrystalline wax.

Examples of silicones include chain silicones such as dimethylpolysiloxane, methylphenylpolysiloxane and methylhydrogenpolysiloxane; cyclic silicones such as octamethyltetrasiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane. To be done.

As the surfactant, anionic surfactant such as sodium laurate; cationic surfactant such as benzalkonium chloride; 2-undecyl-N, N, N-
Examples thereof include amphoteric surfactants such as (hydroxyethylcarboxymethyl) -2-imidazoline sodium; nonionic surfactants such as sorbitan monooleate.

Examples of the lower alcohol include methanol, ethanol, propanol, isopropanol and the like.

Examples of sterols include cholesterol, sitosterol, phytosterol, lanosterol and the like.

Examples of the moisturizer include sorbitol, polyethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, hexylene glycol, glycerin, diglycerin and the like.

As the water-soluble polymer, arabia gum,
Plant-based water-soluble polymers such as tragacanth gum, galactan, carob gum, guar gum, xanthan gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), arge colloid (brown algae extract); microbial systems such as dextran, succinoglucan, pullulan Water-soluble polymer; animal-based water-soluble polymer such as collagen, casein, albumin, gelatin; methyl cellulose, nitrocellulose, ethyl cellulose, methyl hydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, sodium carboxymethyl cellulose (CM
C), cellulose-based water-soluble polymers such as crystalline cellulose and cellulose powder; alginic acid-based water-soluble polymers such as sodium alginate and propylene glycol alginate; vinyl-based water-soluble polymers such as polyvinyl alcohol, polyvinyl methyl ether, and polyvinylpyrrolidone ;
Polyoxyethylene-based water-soluble polymer such as polyethylene glycol; Copolymer-based water-soluble polymer such as polyoxyethylene-polyoxypropylene copolymer; Acrylic water-soluble polymer such as polyethyl acrylate and polyacrylamide; Examples include inorganic water-soluble polymers such as imines, cationic polymers, bentonite, magnesium aluminum silicate (veegum), laponite, hectorite, and silicic acid anhydride.

Examples of the ultraviolet absorbers include benzoic acid type ultraviolet absorbers such as paraaminobenzoic acid; anthranilic acid type ultraviolet absorbers such as methyl anthraate; octyl salicylate.
Salicylic acid-based UV absorbers such as phenyl salicylate and homomethyl salicylate; isopropyl paramethoxycinnamate, octyl paramethoxycinnamate, 2-ethylhexyl paramethoxycinnamate, glyceryl mono-2-ethylhexanoate diparamethoxycinnamate , 3,4,5-trimethoxycinnamic acid, 3-methyl-4- [methylbis (trimethylsiloxy) silyl] butyl and other cinnamic acid-based UV absorbers; 2,4-dihydroxybenzophenone, 2-hydroxy-4- Methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2
-Hydroxy-4-methoxybenzophenone-5-benzophenone-based UV absorbers such as sodium sulfonate;
Urocanic acid, ethyl urocanate, 2-phenyl-5
-Methylbenzoxazole, 2- (2'-hydroxy-
5'-methylphenyl) benzotriazole, 4-te
Examples include rt-butyl-4′-methoxybenzoylmethane.

Examples of the sequestering agent include alanine, sodium edetate, sodium polyphosphate, sodium metaphosphate, phosphoric acid and the like.

Examples of the pH adjusting agent include lactic acid, citric acid, glycolic acid, succinic acid, tartaric acid, dl-malic acid, potassium carbonate, sodium hydrogen carbonate, ammonium hydrogen carbonate and the like.

A neutralizing agent can also be added, for example, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, potassium hydroxide, sodium hydroxide, Examples are triethanolamine and sodium carbonate.

As antioxidants, ascorbic acid, α
-Tocopherol, dibutylhydroxytoluene, butylhydroxyanisole and the like are exemplified.

Antibacterial agents include benzoic acid, salicylic acid,
Examples include carboxylic acid, sorbic acid, paraoxybenzoic acid ester, parachlorometacresol, hexachlorophene, benzalkonium chloride, chlorhexidine chloride, trichlorocarbanilide, photosensitizer, and phenoxyethanol.

As the drug, vitamin A oil, retinol, retinol palmitate, inosit, pyrodoxine hydrochloride, benzyl nicotinate, nicotinic acid amide, DL-α-tocopherol nicotinate, vitamin D ₂ (ergocasiferol), dl-α. -Tocopherol, dl-α-tocopherol acetate, L-ascorbic acid-2-
Sodium sulfate, magnesium ascorbate phosphate,
Ascorbic acid derivatives such as dl-α-tocopherol, 2-L-ascorbic acid phosphoric acid diester potassium, 2-o-α-D-glucopyranosyl-L-ascorbic acid and ascorbic acid; Pantothenic acid, vitamins such as biotin; estradiol , Hormones such as ethinyl estradiol; arginine, lysine, histidine, aspartic acid, glutamic acid, glycine, alanine, valine, leucine, isoleucine, serine, threonine,
Amino acids such as phenylalanine, tyrosine, tryptophan, cystine, cysteine, methionine, proline and tranexanic acid; anti-inflammatory agents such as allantoin, glycyrrhetinic acid and azulene; whitening agents such as arbutin; astringents such as zinc oxide and tannic acid; L- Cooling agents such as menthol and camphor, lysozyme chloride, pyridoxine hydrochloride, γ
-Oryzanol and the like are exemplified.

Various extracts include Dokudami extract,
Oak extract, melilot extract, bonito extract, liquorice extract, peonies extract, bonsai extract, loofah extract, kina extract, saxifrage extract,
Clara extract, kohone extract, fennel extract, primrose extract, rose extract, dio extract, lemon extract, shikon extract, aloe extract, ginger root extract, eucalyptus extract, horsetail extract, sage extract, thyme extract, tea extract, seaweed extract, cucumber extract, clove. Examples include extracts, raspberry extract, melissa extract, carrot extract, horse chestnut extract, peach extract, peach leaf extract, mulberry extract, cornflower extract, hamamelis extract, placenta extract, chest wire extract, silk extract and the like.

The above components can be used in the free state, those capable of salt formation can be used in the form of acid or base salts, and those having a carboxylic acid group can be used in the form of their esters. .

Further, to the gel composition of the present invention, an appropriate fragrance, dye or the like can be added, if necessary.

[0038]

EXAMPLES Next, the present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. In addition, all compounding amounts represent% by weight.

Prior to the examples, the test method used in the present invention,
The evaluation method will be described.

[Gel Formability (Viscosity)] Using a single cylinder type rotational viscometer (VS-A1 type) manufactured by Seiki Kogyo Kenkyusho, rotor No. The viscosity of each sample was measured at 30 ° C. in Example 3, and this viscosity was evaluated as an index of gel-forming property. (Evaluation) ◎: Viscosity 5,000 (cps / 30 ° C) or higher ○: Viscosity 1,000 or higher and 5,000 (cps / 30)
℃) △: Viscosity 100 or more and less than 1,000 (cps / 30 ° C) ×: Viscosity less than 100 (cps / 30 ° C).

[Measurement of Moisturizing Effect by Moisture Evaporation Rate]
1 on a 2.0 x 2.0 cm filter paper (Toyo Filter Paper No. 2)
After dropping 0 μl of the sample solution, the sample solution was allowed to stand at 25 ° C. and 50% relative humidity, and its weight reduction was measured by a balance. Moisture evaporation was assumed to proceed with a linear equation, and the water evaporation rate constant in each sample was obtained. The weight of the sample at time t is w
Then, the evaporation rate of water is

[0042]

[Equation 1] It is represented by

Integrating the expression expressed by the above equation 1,

[0044]

[Equation 2] Is obtained. The wn at the time tn is measured, and Inwn is plotted against tn according to the formula expressed by Formula 2,
The moisture evaporation rate constant (k) was obtained from the slope of the straight line of the linear function. The larger the moisture evaporation rate constant (k), the greater the transpiration property of water, and the smaller the k, the more difficult it is for moisture to evaporate and the higher the moisturizing effect. (Evaluation) ◎: Moisture evaporation rate constant (k) is less than 0.035 ○: Moisture evaporation rate constant (k) is 0.035 or more 0.0
Less than 38 Δ: Moisture evaporation rate constant (k) is 0.038 or more and 0.0
Less than 41 x: Moisture evaporation rate constant (k) is 0.041 or more. Moisture evaporation measurement constant (k) of ion-exchanged water is 0.0.
43.

[Effect of improving rough skin] An active agent (sodium lauryl sulfate) 1 was applied to several places on the forearms of 10 female panels.
A 0% aqueous solution was applied for 3 days to intentionally cause rough skin.
After that, an example product having the following formulation for this rough skin part,
Each comparative example product was applied twice a day, and 20 days after the start of application, the skin surface condition was measured by the replica method and skin conductance, and the skin improvement effect was evaluated according to the following criteria in comparison with the site where nothing was applied after rough skin. did. (Judgment criteria) Significant effect: The symptoms of rough skin disappeared Effective: The symptoms of rough skin weakened Slightly effective: The symptoms of rough skin became slightly weaker Invalid: The symptoms of rough skin did not change. Symptoms of (1) stratum corneum exfoliation, erythema occurs, (2) sulcus and crust are not clear,
This indicates that the skin texture is not uniform. (Evaluation) ⊚: 80% or more of subjects who evaluated excellent, effective, and slightly effective ○: 50 to less than 80% of subjects who evaluated excellent, effective, and slightly effective Δ: excellent, effective, 30% to less than 50% of the subjects evaluated to be slightly effective. X: Less than 30% of the subjects evaluated to be excellent, effective, and slightly effective.

Examples 1 to 5 and Comparative Examples 1 to 5 Gel compositions having the formulations shown in Tables 1 and 2 below were prepared. Using this, the gel forming property, the moisturizing effect, and the rough skin improving effect were evaluated by the above test methods. The results are shown in Tables 1 and 2.

[0047]

[Table 1]

[0048]

[Table 2] Example 6, Comparative Examples 6 to 7 Gel compositions having the formulations shown in Table 3 below were prepared. The gel forming property, the moisturizing effect, and the rough skin improving effect were evaluated by the above-mentioned test method using this. The results are shown in Table 3.

[0049]

[Table 3] In Example 6, a gel having an appropriate viscosity was produced without using a base (potassium hydroxide) as a neutralizing agent, and a stronger moisturizing effect was recognized than that of Comparative Example 7 containing a moisturizing agent.

Examples 7 to 11 Gel compositions having the formulations shown in Table 4 below were prepared. Specifically, (3) and (4) were dissolved in (1) (ethanol phase). Separately, a solution prepared by dissolving (2) and (5) in (6) was prepared (aqueous phase). Then, the ethanol phase was added to the aqueous phase and solubilized to obtain a beauty solution. Using this, the gel forming property, the moisturizing effect, and the rough skin improving effect were evaluated by the above test methods. The results are shown in Table 4.

[0051]

[Table 4] Example 12 (Ingredient) (wt%) A. Oil phase Squalane 10.0 Isopropyl palmitate 5.0 POE (25) cetyl ether 0.5 Vaseline 3.0 Dimethylpolysiloxane 2.0 Hexyldecanol 3.0 α-Tocopherol 0.3 B. Aqueous phase Polyethylene glycol 8.0 Methyl paraoxybenzoate 0.1 Sodium metaphosphate 0.1 Carboxyvinyl polymer (“Carbopol 941”) 0.5 Trimethylglycine 20.0 Ion-exchanged water Residual production method Phase A (oil phase) Was heated to 70 ° C. and dissolved. The phase B (aqueous phase) component was similarly heated to 70 ° C. and dissolved. This A
The phase (oil phase) component was sufficiently emulsified by adding the phase B (water phase) component while sufficiently performing the homogenizer treatment, and cooled using a heat exchanger to obtain an emulsion. The emulsion thus obtained had good gel-forming property (viscosity), and was excellent in moisturizing property and rough skin improving effect.

Example 13 (Ingredients) (wt%) A. Oil phase Liquid paraffin 10.0 Jojoba oil 4.0 Dimethyl polysiloxane (10 cs) 3.0 POE (15) sorbitan monostearate 1.0 Stearic acid monoglycerin ester 0.5 Vitamin A oil 3.0 B. Aqueous phase Arbutin 2.0 Magnesium ascorbate phosphate 1.0 Placenta extract 0.5 Trisodium edetate 0.15 Carboxyvinyl polymer (“Carbopol 941”) 0.15 Methyl parabenzoate 0.1 Phenoxyethanol 0.2 γ-Butyrobetaine 0.1 Ion-exchanged water The components of the residual production method phase A (oil phase) were heated to 70 ° C. and dissolved. The phase B (aqueous phase) component was similarly heated to 70 ° C. and dissolved. This A
The phase (oil phase) component was sufficiently emulsified by adding the phase B (water phase) component while sufficiently performing the homogenizer treatment, and cooled using a heat exchanger to obtain an emulsion. The emulsion thus obtained had good gel-forming property (viscosity), and was excellent in moisturizing property and rough skin improving effect.

Example 14 (Ingredients) (wt%) A. Oil phase Stearic acid 2.0 Cetyl alcohol 1.5 Vaseline 4.0 Squalane 5.0 Glycerol tri-2-ethylhexanoic acid ester 2.0 Sorbitan monooleic acid ester 2.0 2-Ethylhexyl paramethoxycinnamate 2. 0 dl-α-tocopherol acetate 0.5 Ethyl paraoxybenzoate 0.1 B.I. Aqueous phase Dipropylene glycol 5.0 Polyethylene glycol (1500) 3.0 Trisodium edetate 0.15 Carboxyvinyl polymer (“Carbopol 941”) 5.0 Carboxymethyl cellulose 0.8 Trimethylglycine 10.0 Potassium hydroxide 1 0.0 Ion-exchanged water A part of the ion-exchanged water in the residual production phase B was taken, and "Carbopol 941" and trimethylglycine were dissolved therein to obtain a gel. The components of phase A (oil phase) were heated to 70 ° C. and dissolved.
The components of phase B (aqueous phase; except for "Carbopol 941" and trimethylglycine) were also heated to 70 ° C and dissolved. To this phase A (oil phase) component, the phase B (water phase) component was added while sufficiently performing a homogenizer treatment to emulsify, and the above gel was added and well stirred, and then a heat exchanger was used. After cooling, an emulsion was obtained. The emulsion thus obtained had good gel-forming property (viscosity), and was excellent in moisturizing property and rough skin improving effect.

Example 15 (Ingredients) (wt%) Solbit 4.0 Dipropylene glycol 6.0 Polyethylene glycol (1500) 5.0 Ethanol 10.0 POE (20) Oleyl alcohol ether 0.5 Carboxyvinyl polymer ( "Carbopol 941") 0.15 γ- butyrobetaine 0.8 takes a part of the ion exchange water Balance preparation of ion-exchange water, to this "Carbopol 94
1 ”and trimethylglycine were dissolved and a gel was obtained.
Solbit, dipropylene glycol, and polyethylene glycol (1500) were heated to 70 ° C and added to the rest of the ion-exchanged water, and the above gel was added to this to obtain a uniform aqueous solution. POE (20) oleyl alcohol ether was added to ethanol to prepare an alcohol solution, which was added and mixed with the above-mentioned aqueous solution to obtain a solubilized product. The obtained solubilized product had good gel-forming property (viscosity), and was excellent in moisturizing property and rough skin improving effect.

[0055]

As described in detail above, according to the present invention, by containing a carboxyvinyl polymer and low molecular weight betaine, the gel forming property is excellent and the moisturizing effect is high,
It is possible to provide a gel composition that is excellent in the effect of improving rough skin and that can easily manufacture a gel base material.

Claims (9)

[Claims] 1. A gel composition comprising a carboxyvinyl polymer and low molecular weight betaine. 2. A low molecular weight betaine has the following general formula (I): (In the formula, R ¹ , R ² and R ³ each independently represent an alkyl group having 1 to 6 carbon atoms; n represents 0 or a positive integer; provided that the carbon number of R ¹ , R ² and R ³ is And the total of n and n are 8 or less), The gel composition according to claim 1, which is a quaternary ammonium salt. 3. In the general formula (I), R ¹ , R ² and R ³
The gel composition according to claim 2, wherein each is a methyl group. 4. The gel composition according to claim 2, wherein n is 0 in the general formula (I). 5. The gel composition according to claim 2, wherein n is 2 in the general formula (I). 6. A carboxyvinyl polymer is blended in a gel composition in an amount of 0.01 to 5% by weight, and
The gel composition according to any one of 1. 7. A carboxyvinyl polymer is incorporated in a gel composition in an amount of 0.05 to 2% by weight, and
The gel composition according to any one of 1. 8. The low molecular weight betaine is 0.0 in the gel composition.
The gel composition according to any one of claims 1 to 7, which is blended in an amount of 1 to 30% by weight. 9. The low molecular weight betaine is added to the gel composition in an amount of 0.1.
The gel composition according to any one of claims 1 to 7, which is contained in an amount of -20% by weight.