JP6979794B2 - Gel shaving agent composition - Google Patents

Description

The present invention relates to a gelled shaving agent composition.

Shaving agents are used when shaving beards and hair with a razor. Many shaving agents are based on fatty acid soap, and for example, in addition to general soap, there are shaving soap, shaving cream, aerosol type shaving foam, post-foaming gel cream and the like (Non-Patent Document 1). ). In addition, non-foaming gel-like shaving agents are also known (Patent Documents 1 to 4).

Japanese Unexamined Patent Publication No. 9-132516 Japanese Unexamined Patent Publication No. 10-87454 Japanese Unexamined Patent Publication No. 2007-55987 Japanese Unexamined Patent Publication No. 2013-139422

"New Cosmetics", Nanzando, 2nd Edition, 2001, p. 392-396

When shaving a beard or body hair with a razor, the old stratum corneum of the skin is also scraped off, so it is thought that it is easily affected by irritation. Therefore, it is preferable that the shaving agent itself has a small effect on the skin. Furthermore, even men are becoming more aware of skin care, and there is a demand for shaving agents that have less burden on the skin.

Aged skin has reduced elasticity and is not firm and easily deformed, and when shaving, it is dragged by a razor and the cutting edge does not hit the beard well, making it difficult to shave. Therefore, it is easy to shave repeatedly and cause rough skin.

The present invention provides a gel-like shaving agent composition that is easy to shave even on aged skin and has less burden on the skin.

The present inventor is a polymer thickening gelling agent, ^{a highly polymerized polyethylene oxide having a number average molecular weight of 1 × 10 5 to} 7 × 10 ⁶ , polypropylene glycol having a number average molecular weight of 2 × 10 ² to 4 × 10 ³ , and water. It has been found that a gel-like shaving agent composition that solves the above-mentioned problems can be obtained by using in combination.

That is, according to the present invention.
The following components (A), (B), (C) and (D):
(A) Polymer thickening gelling agent,
(B) Highly polymerized polyethylene oxide having a number average molecular weight of 1 × 10 ^{5 to} 7 × 10 ^6.
(C) Polypropylene glycol having a number average molecular weight of 2 × 10 ² to 4 × 10 ^3.
(D) A gel-like shaving agent composition containing water is provided.

Further, according to the present invention, there is provided a shaving method in which the gel-like shaving agent composition of the present invention is applied to the skin, shaving, and then washed away.

According to the present invention, there is provided a gel-like shaving agent composition that is easy to shave even on aged skin and has less burden on the skin.

Hereinafter, embodiments of the present invention will be described.
In the present embodiment, the gel-like shaving agent contains the following components (A) to (D).
(A) Polymer thickening gelling agent,
(B) Highly polymerized polyethylene oxide having a number average molecular weight of 1 × 10 ^{5 to} 7 × 10 ^6.
(C) Polypropylene glycol having a number average molecular weight of 2 × 10 ² to 4 × 10 ^3.
(D) Water

(Ingredient (A))
The polymer thickening gelling agent of the component (A) is a component other than the components (B) and (C) described later.
Ingredients (A) include polysaccharides, proteins and peptides, and other (co) polymers.
Among the components (A), specific examples of the polysaccharide include guar gum, locust bean gum, queens seed, carrageenan, galactan, arabic gum, tara gum, tamarind seed gum, farcerelan, karaya gum, trolley aoi, cara gum, tragant gum, and pectin. Salts such as pectic acid and its sodium salt, salts such as alginic acid and its sodium salt, carrageenan;
Starch derived from rice, corn, potatoes, wheat, etc .;
Xanthan gum, dextran, succinoglucan, curdlan, hyaluronic acid and its salts, pullulan, gellan gum, chitin, chitosan, agar, casso extract, chondroitin sulfate, etc.;
Methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose and salts such as sodium thereof, methyl hydroxypropyl cellulose, sodium cellulose sulfate, dialkyldimethylammonium sulfate cellulose, crystalline cellulose, cellulose powder, cellulose such as nitrocellulose and derivatives thereof;
Starch-based polymers such as soluble starch, carboxymethyl starch, methylhydroxypropyl starch and methyl starch, starch derivatives such as hydroxypropyltrimonium chloride starch and octenyl succinate corn starch aluminum;
Alginic acid derivatives such as sodium alginate and propylene glycol alginate;
Examples thereof include cationized polysaccharides such as cationized oligosaccharides, cationized dextran, guarhydroxypropyltrimonium chloride, and cationized cellulose such as polyquaternium-10.
Specific examples of the protein and peptide among the component (A) include casein, collagen, gelatin, albumin and the like.
Among the components (A), specific examples of other (co) polymers include polyvinyl pidridone (PVP), polyvinyl alcohol (PVA), vinyl pidridone / vinyl alcohol copolymer, and polyvinyl derivatives such as polyvinyl methyl ether;
Amphoteric methacrylic acid ester copolymers such as (methacrylic acid oxyethyl carboxybetaine / alkyl methacrylate) copolymers, (Acrylates / stearyl acrylates / ethylamine methacrylate) copolymers;
(Dimethicone / Vinyl Dimethicone) Cross Polymer, (Alkyl Acrylate / Diacetone Acrylamide) Copolymer, (Alkyl Acrylate / Diacetone Acrylamide) Copolymer AMP;
Polyvinyl acetate partially saponified product, maleic acid copolymer; vinylpyrrolidone / dialkylaminoalkyl methacrylate copolymer;
Acrylic resin alkanolamine;
Polyester, water-dispersible polyester;
Polyacrylamide;
Polyacrylic acid ester copolymers such as ethyl polyacrylate, carboxyvinyl polymers, salts such as polyacrylic acid and sodium salts thereof, acrylic acid / methacrylic acid ester copolymers;
Acrylic acid / alkyl methacrylic acid copolymer;
Dialyldimethylammonium chloride / acrylamide copolymer such as polyquaternium-7, acrylic acid / diallyldimethylammonium chloride copolymer such as polyquaternium-22, acrylic acid / diallyldimethylammonium chloride / acrylamide copolymer such as polyquaternium-39, acrylic Acid / cationized methacrylic acid ester copolymer, acrylate / cationized methacrylic acid amide copolymer, polyquaternium-47 and other acrylic acid / methyl acrylate / methacrylic acid propylamide propyltrimethylammonium copolymer, methacrylic chloride Choline ester polymer;
Polyethyleneimine;
Cationic polymer;
Polymers of 2-methacryloyloxyethyl phosphorylcholine such as polyquaternium-51 and copolymers with butyl methacrylate copolymers and the like;
Polymer emulsions such as acrylic resin emulsions, ethyl polyacrylic acid emulsions, polyacrylic alkyl ester emulsions, polyvinyl acetate resin emulsions, natural rubber latexs, and synthetic latexs;
Polyurethanes and various copolymers;
Various silicones;
Various silicone-based copolymers such as acrylic-silicone graft copolymers;
Various fluoropolymers;
12-Hydroxystearic acid and its salts;
Dextrin fatty acid esters such as dextrin palmitate and dextrin myristinate; sucrose fatty acid esters and fructo-oligosaccharide fatty acid esters can be used.

From the viewpoint of forming a firm gel and obtaining a good feeling of use, the gel-like shaving agent composition is a group consisting of a carboxyvinyl polymer, an acrylic acid / alkyl methacrylate copolymer and salts thereof as the component (A). It is preferable to contain at least one selected from. On the other hand, from the viewpoint of preventing the gel from melting and collapsing when applied to the skin, it is preferable that the gel-like shaving agent composition contains the component (F) carboxymethyl cellulose or a salt thereof or a derivative thereof as the component (A). As the component (A), at least one selected from the group consisting of a carboxyvinyl polymer, an acrylic acid / alkyl methacrylate copolymer and a salt thereof is contained, and further, the component (F) carboxymethyl cellulose or a salt thereof or a salt thereof or It is more preferable to contain those derivatives.

The above-mentioned carboxyvinyl polymer is a crosslinked acrylic acid polymer (INCI name: carbomer). Specific examples of the carboxyvinyl polymer include Carbo-mer 910, 934, 940, 941, 980, 2984, ETD 2050, Ultraz 10 (above, manufactured by Lubrizol Advanced Materials), Hibiswaco 104, 105 (above, Wako Pure Chemical Industries, Ltd.). , Apec HV-505E, HV-805EG (all manufactured by Sumitomo Seika Chemical Industries, Ltd.) and the like can be used.

The above-mentioned acrylic acid / alkyl methacrylate copolymer is a copolymer of acrylic acid and alkyl methacrylic acid having 10 to 30 carbon atoms (INCI name: (Acrylate / alkyl acrylate (C10-30)) crosspolymer. ). Specific examples of the acrylic acid / methacrylic acid alkyl copolymer include Pemlen TR-1, TR-2, Carbo-mer ETD 2020, 1382, Ultrez 20, 21 (all manufactured by Lubrizol Advanced Materials), and Akpek HV-501ER. , HV-701EDR (all manufactured by Sumitomo Seika Co., Ltd.) and other commercially available products can be used.

In the gel-like shaving agent composition, it is preferable that the carboxyvinyl polymer and the acrylic acid / alkyl methacrylate copolymer are all neutralized, and a part or all of them form a salt. Examples of the salt include alkanolamine salts, amino acid salts, ammonium salts, alkali metal salts and the like. The base that neutralizes the component (A) is not limited, and examples thereof include organic base compounds such as alkanolamine and basic amino acids, and inorganic base compounds such as ammonia and alkali metal hydroxide. Specifically, alkanolamines include triethanolamine, 2-amino-2-methyl-1-propanol and the like; basic amino acids include arginine, lysine and histidine; alkali metal hydroxides include sodium hydroxide and hydroxide. Potassium and the like can be used. Among these, an inorganic base compound is preferable from the viewpoint of stability, and an alkali metal hydroxide is more preferable.

The gel-like shaving agent composition of the present embodiment preferably further contains the component (F) carboxymethyl cellulose or a salt thereof or a derivative thereof as the component (A). Carboxymethyl cellulose of the component (F) is a derivative of cellulose, and has a carboxymethyl group (-CH _2- COOH) bonded to a part of the hydroxy groups of the glucopyranose monomer constituting the skeleton of cellulose. It is preferable that the component (F) is neutralized and a part or all of the component (F) forms a salt. The base that neutralizes the component (F) is not limited, and examples thereof include organic base compounds such as alkanolamines and basic amino acids, and inorganic base compounds such as ammonia and alkali metal hydroxides. Specifically, alkanolamines include triethanolamine, 2-amino-2-methyl-1-propanol and the like; basic amino acids include arginine, lysine and histidine; alkali metal hydroxides include sodium hydroxide and hydroxide. Potassium and the like can be used. Among these, an inorganic base compound is preferable from the viewpoint of stability, and an alkali metal hydroxide is more preferable. Further, sodium carboxymethyl cellulose is preferable.

As the component (F) carboxymethyl cellulose or a salt thereof or a derivative thereof, those used in cosmetics and the like can be used, and for example, Ernest gum FD-HH, FD-M, CMC Daicel 1150, 1350 ( Commercial products such as Daicel), Sunrose F600MC, F300HC, F30MC, and F20HC (Nippon Paper Chemicals) can be used.

The content of the component (F) is preferably 0.043% by mass or more, more preferably 0.043% by mass or more, in the total composition of the gel-like shaving agent composition as a salt from the viewpoint of preventing the gel from melting and collapsing when applied to the skin. Is 0.085% by mass or more, more preferably 0.2% by mass or more, preferably 2% by mass or less, more preferably 1.7% by mass or less, still more preferably 1% by mass or less. .. The content of the component (F) is preferably 0.05 to 2% by mass, more preferably 0.1 to 1.5% by mass, and even more preferably 0.1% by mass in the total composition of the gel shaving agent composition as a salt. It is 0.2 to 1.0% by mass. By setting the content of the component (F) in this range, the slip of the razor can be improved.

In the gel-like shaving agent composition of the present embodiment, the mass ratio of the component (F) to the entire component (A) is preferably ((F) / (A)) = 0.05 to 1, which is more preferable. Is 0.1 to 0.85. By setting ((F) / (A)) in this range, the stability of the formulation is good, the thinning of the gel when applied to the skin is weakened, and the skin residue of the agent is improved even after shaving once. Can be done.

The content of the component (A) is preferably 0.04% by mass or more, more preferably 0.04% by mass or more in the entire composition of the gel-like shaving agent composition from the viewpoint of forming a firm gel and obtaining a good usability. 0.85% by mass or more, still more preferably 0.9% by mass or more, still more preferably 0.95% by mass, preferably 2% by mass or less, still more preferably 1.8% by mass or less. More preferably, it is 1.5% by mass or less. The content of the component (A) is preferably 0.85 to 2% by mass, more preferably 0.9 to 1.8% by mass, and even more preferably 0.9 to 2% by mass in the total composition of the gel-like shaving agent composition. It is 0.95 to 1.5% by mass. Since the component (A) retains a large amount of water and is adsorbed on the skin, sufficient water can be supplied to the beard by setting the content in this range.

(Component (B))
The highly polymerized polyethylene oxide of component (B) has a specific number average molecular weight. The number average molecular weight of the highly polymerized polyethylene oxide of the component (B) is 1 × 10 ^{5 to} 7 × 10 ⁶ from the viewpoint of improving the slipperiness of the razor, preferably 4 × 10 ^{5 to} 5 × 10 ⁶ . It is preferably 2 × 10 ⁶ to 4 × 10 ⁶ .

The content of the component (B) is preferably 0.01% by mass or more, more preferably 0.03% by mass in the total composition of the gel-like shaving agent composition from the viewpoint of improving the slipperiness of the razor. % Or more. Further, from the viewpoint of suppressing stickiness and stringing of the composition, the content of the component (B) is preferably 0.3% by mass or less in the total composition of the gel-like shaving agent composition, and more preferably 0. It is 2% by mass or less.

In the gel-like shaving agent composition of the present embodiment, the mass ratio of the component (B) to the component (A) is preferably ((B) / (A)) = 0.005 to 0.35. More preferably, it is 0.01 to 0.25. By setting ((B) / (A)) in this range, the razor becomes slippery, and the occurrence of stickiness and stringing can be further suppressed.

(Component (C))
Polypropylene glycol of component (C) has a specific number average molecular weight. ^{The number average molecular weight of the component (C) is 2 × 10 2} to 4 × 10 ³ from the viewpoint of improving the slipperiness of the razor, moisturizing the shaving skin, and non-stickiness, and 4 × 10 ^{It is preferably 2 to} 2.3 × 10 ³ , and more preferably 7 × 10 ² to 2 × 10 ³ .
Here, the number average molecular weight of the component (C) is a value measured by gel permeation chromatography (GPC) using polystyrene as a standard sample. Specific measurement conditions will be described later in the section of Examples.

The content of the component (C) is preferably 0.7% by mass or more, more preferably 1% by mass or more, still more preferably 1% by mass or more in the total composition of the gel shaving agent composition from the viewpoint of making the razor slippery. It is 1.5% by mass or more. Further, from the viewpoint of suppressing stickiness of the composition, the content of the component (C) is preferably 10% by mass or less, more preferably 5% by mass or less, still more preferably 4% by mass or less in the total composition. be.

In the gel-like shaving agent composition of the present embodiment, from the viewpoint that the mass ratio of the component (C) to the component (B) makes the razor slippery and gives a moisturizing feeling after shaving, ((C) / (B). )) = 2.33 to 1000, more preferably 3.33 to 500, and even more preferably 10 to 200.

Further, in the gel-like shaving agent composition of the present embodiment, from the viewpoint of making the razor slippery and suppressing stickiness and stringiness, the mass ratio of the component (B) to the component (A) is preferably (((). B) / (A)) = 0.005 to 0.35, and the mass ratio of the component (C) to the component (B) is ((C) / (B)) = 2.33 to 1000.

(Component (D))
The water of the component (D) can be the balance of the entire composition of the gel-like shaving agent composition excluding other components. Further, the content of the component (D) water is preferably 70% by mass or more, more preferably 80% by mass or more in the total composition of the gel-like shaving agent composition from the viewpoint of softening the beard and the skin. Further, it is preferably 99% by mass or less, more preferably 98% by mass or less, and further preferably 97% by mass or less.

Further, in the gel-like shaving agent composition, the content of the component (A) is 0.04% by mass or more and 2% by mass or less in the total composition, and the content of the component (B) is 0 in the total composition. 0.01% by mass or more and 0.3% by mass or less, the content of the component (C) is 0.7% by mass or more and 10% by mass or less in the total composition, and the content of the component (D) is the total. It may be 70% by mass or more and 99% by mass or less in the composition.

Since the gel-like shaving agent composition of the present embodiment contains the water of the component (D) together with the components (A) to (C), it does not drip from the place where it is applied and has a sufficient amount for hair and skin such as a beard. It can supply water and soften hair such as beard and skin sufficiently. Further, the gel-like shaving agent composition of the present embodiment has good slipperiness of the razor, so that an extremely good shaving comfort can be obtained. Then, it is possible to give a moisturizing feeling to the skin after shaving.

Further, in this embodiment, the polymer thickening gelling agent of the component (A), the highly polymerized polyethylene oxide of the component (B), the polypropylene glycol of the component (C) and the water of the component (D) are contained. It achieves the stability of the formulation, slippage during shaving for skin that has become difficult to shave due to aging, and moisturizing effect after shaving. The mechanism of this effect is not always clear, but it is presumed that the interaction between highly polymerized polyethylene oxide and polypropylene glycol forms a highly lubricated phase on the skin that cannot be expressed by each. It is also considered that the residual polyethylene glycol exerts a moisturizing effect.

As described above, the gel-like shaving agent composition of the present embodiment is comfortable to shave even on the skin that has become difficult to shave due to aging, and it is possible to feel the moisturizing feeling after shaving. Further, by using the gel-like shaving agent composition of the present embodiment, the burden on the skin can be reduced.

In the present embodiment, the gel-like shaving agent composition may contain components other than the components (A) to (D).

(Ingredient (E))
The gel-like shaving agent composition of the present embodiment further preferably contains a salt as the component (E). The component (E) is a salt other than the above-mentioned component (A). The salt of the component (E) adjusts the viscosity of the gel-like shaving agent composition obtained from the components (A) to (D), suppresses the decrease in the viscosity of the gel that occurs when applied to the skin, and firmly at the time of application. The gel can be applied. As a result, the gel remains on the skin even after repeated shaving, and it is possible to prevent the skin from being damaged.

Examples of the component (E) salt include alkanolamine salts, organic compound salts such as carboxylates and amino acid salts; and inorganic compound salts such as alkali metal salts. Specific examples of the alkanolamine salt include triethanolamine hydrochloride, triethanolamine sulfate, triethanolamine phosphate and the like. Further, examples of the amino acid salt include arginine hydrochloride, arginine phosphate and the like. Examples of the salt of the combination of polyvalent acid monobases include sodium succinate and potassium succinate as the combination of divalent acid monobases. Examples of the combination of trivalent monobases include sodium citrate and potassium citrate. Examples of the inorganic compound salt include sodium chloride and potassium chloride, and as a salt of a combination of polyvalent acid monobases, as a combination of divalent acid monobases, as a combination of sodium sulfate, potassium sulfate and trivalent acid monobases. Examples thereof include sodium phosphate, sodium hydrogen phosphate, potassium phosphate, potassium hydrogen phosphate and the like.

Above all, a salt of a combination of an organic and an inorganic polyvalent acid monobase is preferable because the content can be reduced. Furthermore, a combination of an inorganic weak acid and a strong base is preferable in that it has a buffering ability. More specifically, sodium phosphate, sodium hydrogen phosphate, potassium phosphate, and potassium hydrogen phosphate are more preferable.

The content of the component (E) is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and 1% by mass or less in the total composition of the gel-like shaving agent composition. Is preferable, and more preferably 0.8% by mass or less. By setting the content of the component (E) to this range, when applied to the skin, the viscosity of the gel on the skin does not decrease and a firm and firm gel structure can be maintained. Therefore, the gel is repeatedly shaved. Even after that, the gel remains on the skin, making it less likely to damage the skin.

In the gel-like shaving agent composition of the present embodiment, the mass ratio of the component (E) to the component (A) is preferably ((E) / (A)) = 0.05 to 1, more preferably. Is 0.1 to 0.8. By setting ((E) / (A)) in this range, when applied to the skin, it is possible to maintain a firm gel structure with little thinning on the skin and strong elasticity, and when applied, the gel It is possible to obtain a shaving agent composition that gives a feeling of thickness to the skin and gives a feeling of protection to the skin.

Further, the gel-like shaving agent composition of the present embodiment may contain other general ingredients used in cosmetics, for example, a viscosity modifier, an anti-inflammatory agent, an ultraviolet absorber, and a refreshing agent. , Pigments, fragrances and the like can be contained. By containing these, according to the gel-like shaving agent composition of the present embodiment, it becomes possible to enjoy the feel adjustment, the refreshing feeling, and the scent of the dosage form. In addition, if a bactericide is added, the skin can be cleaned at the stage where the shaving agent is applied before using the razor, so that it is possible to prevent the invasion of pathogens into the skin.

The gel-like shaving agent composition of the present embodiment can be produced by a conventional method.
For example, in the compounding tank, a part of the component (D) water is heated and stirred, and the component (B) highly polymerized polyethylene oxide is added and dissolved, and then the heating is stopped. When the component (A) contains the component (F), the component (F) carboxymethyl cellulose or a salt thereof or a derivative thereof is also dissolved. Separately, in the dispersion tank, the component (A) other than the component (F) is added to the remaining component (D) water, and the mixture is stirred and dispersed. The liquid in the dispersion tank is dropped into the compounding tank and stirred. Further, the component (C) polypropylene glycol is added and stirred. In some cases, the component (E) salt is added and stirred. The solution is stirred and cooled to room temperature while making it uniform. The gel-like shaving agent composition of the present embodiment can be produced by sequentially adding other active ingredients suitable for cosmetics as needed and finally neutralizing with a neutralizing base.

The gel-like shaving agent composition of the present embodiment preferably has a viscosity in the Brookfield viscosity (30 ° C.) in the range of 1,000 to 70,000 mPa · s, preferably 5,000 to 60,000 mPa · s. It is more preferably s, and even more preferably 10,000 to 50,000 mPa · s. When the viscosity of the gel-like shaving agent composition is within this range, the adhesiveness to the whiskers and the skin is good, it is easy to extend at the coating portion, and the razor applied to the coating portion adheres to the skin and does not slip up, which is preferable.
Here, the Brookfield viscosity can be measured with a B-type viscometer (Tokimec, TA-type rotor, rotor rotation speed 5 r / min, measurement time 60 seconds, measurement temperature 30 ° C.).

As a specific pharmaceutical form of the gel-like shaving agent composition of the present embodiment, it is preferable that it is a non-foaming shaving agent, and it is preferable that it is filled in a tube or a bottle. Further, it may be filled in a double pressure-resistant container similar to the conventional post-foaming shaving gel aerosol product.

The gel-like shaving agent composition of the present embodiment can be applied to the skin as it is without foaming, and is less likely to drip. Therefore, when using the gel-like shaving agent composition of the present embodiment, for example, take the gel-like shaving agent composition on the palm, apply it to the skin as it is without foaming, and use a razor to apply body hair such as a beard. After shaving, rinse with water.
Further, the shaving method in the present embodiment is a method in which the gel-like shaving agent composition in the present embodiment is applied to the skin, shaving, and then removed from the skin, and the gel-like shaving agent composition in the present embodiment is preferable. This is a method of applying an object to the skin, shaving, and then rinsing.

Although the embodiments of the present invention have been described above, these are examples of the present invention, and various configurations other than the above can be adopted.

(Examples 1 to 9, Comparative Examples 1 to 3)
The gel-like shaving agent composition having the composition shown in Tables 1 and 2 was produced by a conventional method, and the ease of applying the agent on the skin, the feeling of the agent applied to the skin, and the slippage of the razor when shaving once. We evaluated the sex, the feeling that the skin is protected from the cutting edge, the feeling that the razor is less defeated, the moisturizing feeling after shaving, and the ease of rinsing the razor. The results are also shown in Tables 1 and 2.
Further, in Tables 1 and 2, the unit of the blending amount of each component is mass%.

(Manufacturing method) Examples 1 to 9, Comparative Examples 1 to 3.
The component (A) was added to a part of the water of the component (D), and the mixture was stirred and dispersed. The component (B) and the component (F) were appropriately dispersed in polyethylene glycol, added to a part of the water of the component (D), heated to 80 ° C., stirred and dissolved, and then the heating was stopped. The liquid in which the component (A) is dispersed is appropriately mixed with the liquid in which the component (B) and the component (F) are dissolved, and further, the component (C) or the component (C') is appropriately added and stirred to make it uniform. And cooled to room temperature. In some cases, a solution of the component (E) added to a part of the water of the component (D) was added, and the mixture was stirred to make it uniform. A base was added to the remaining water of the component (D), a diluted product was added, and the mixture was stirred to make it uniform to obtain a gel-like shaving agent composition.

(Measurement method of number average molecular weight)
The number average molecular weight of polypropylene glycol in Examples and Comparative Examples can be measured by the following devices and conditions.
(Measuring equipment / conditions)
Tosoh Integrated GPC Equipment Equipment: HLC-8220GPC
Detector: RI (Differential Refractometer)
Column: TSK-gel G5000HxL (7.8 x 300 mm) x 1;
Same as G4000HxL (7.8 x 300mm) x 1;
Same as G3000HxL (7.8 x 300mm) x 1;
Same G2000HxL (7.8 x 300mm) x 1
Mobile phase: THF (tetrahydrofuran)
Flow rate: 1.0 mL / min
Set temperature: 40 ° C
Injection amount: 100 μL (sample concentration: 0.4%)
Measure the number average molecular weight in terms of polystyrene (*).
* Polystyrene: TSK standard polystyrene manufactured by Tosoh Corporation

(Evaluation method)
Using each gel shaving agent composition, shaving on a panel of 10 adult men (in their 50s, with the awareness that "shaving became harder with age" and "skin firmness decreased with age"). "Easy to apply the agent", "feeling of the agent applied to the skin", "slipperiness of the razor", "feeling that the skin is protected from the cutting edge", "feeling that the razor is less defeated", " The evaluation items of "moisturizing feeling after shaving" and "ease of washing off the agent adhering to the razor" were sensory-evaluated according to the following evaluation criteria. For shaving, wash your face, wipe off the moisture with a towel, and then apply 4 g of the gel-like shaving agent composition to your beard by hand under constant temperature and humidity (20 ° C, 65% RH) conditions, and use a 4-blade shaving agent. It was done using a razor (Quattro 4, Schick). The agent on the razor after shaving was rinsed with running water from tap water.

(1) Ease of application of agent:
A: The number of panels evaluated as being easy to apply the agent is 9 or more.
B: The number of panels evaluated as being easy to apply the agent was 7 to 8 people.
C: The number of panels evaluated as being easy to apply the agent was 5 to 6 people.
D: The number of panels evaluated as having good ease of application of the agent was 3 to 4.
E: The number of panels evaluated as having good ease of application of the agent is 2 or less.

(2) Feeling of the agent applied to the skin:
A: The number of panels evaluated that the agent applied to the skin feels good is 9 or more.
B: The number of panels evaluated that the agent applied to the skin feels good is 7 to 8 people.
C: The number of panels evaluated that the agent applied to the skin feels good is 5 to 6 people.
D: The number of panels evaluated that the agent applied to the skin feels good is 3 to 4 people.
E: The number of panels evaluated as having a good feeling of the agent applied to the skin is 2 or less.

(3) Razor slipperiness:
A: The number of panels evaluated as having good razor slipperiness is 9 or more.
B: The number of panels evaluated as having good razor slipperiness is 7 to 8 people.
C: The number of panels evaluated as having good razor slipperiness is 5 to 6 people.
D: The number of panels evaluated as having good razor slipperiness is 3-4 people.
E: The number of panels evaluated as having good razor slipperiness is 2 or less.

(4) Feeling that the skin is protected from the cutting edge:
A: The number of panels evaluated as having a good feeling of protecting the skin from the cutting edge is 9 or more.
B: The number of panels evaluated as having a good feeling of protecting the skin from the cutting edge is 7 to 8 people.
C: The number of panels evaluated as having a good feeling of protecting the skin from the cutting edge is 5 to 6 people.
D: The number of panels evaluated as having a good feeling of protecting the skin from the cutting edge is 3 to 4 people.
E: The number of panels evaluated as having a good feeling of protecting the skin from the cutting edge is 2 or less.

(5) Feeling that there is little loss of razor:
A: The number of panels evaluated as having few razor losses is 9 or more.
B: The number of panels evaluated as having few razor losses is 7-8.
C: The number of panels evaluated as having few razor losses was 5 to 6.
D: The number of panels evaluated as having few razor losses is 3-4.
E: The number of panels evaluated as having few razor losses is 2 or less.

(6) Moisturizing feeling after shaving:
A: The number of panels evaluated as having a moisturizing feeling after shaving is 9 or more.
B: The number of panels evaluated as having a moisturizing feeling after shaving is 7 to 8 people.
C: The number of panels evaluated as having a moisturizing feeling after shaving is 5 to 6 people.
D: The number of panels evaluated as having a moisturizing feeling after shaving is 3 to 4 people.
E: The number of panels evaluated as having a moisturizing feeling after shaving is 2 or less.

(7) Easy to wash off the razor:
A: The number of panels evaluated that the agent adhering to the razor is easy to wash off is 9 or more.
B: The number of panels evaluated that the agent adhering to the razor is easy to wash off is 7 to 8 people.
C: The number of panels evaluated that the agent adhering to the razor is easy to wash off is 5 to 6 people.
D: The number of panels evaluated that the agent adhering to the razor is easy to wash off is 3 to 4 people.
E: The number of panels evaluated that the agent adhering to the razor is easy to wash off is 2 or less.

Details of the components listed in Tables 1 and 2 are shown below.
* 1 Carboxyvinyl polymer: Carbopol 980, manufactured by Lubrizol Advanced Materials * 2 Acrylic acid / alkyl methacrylate copolymer: Pemlen TR-1, manufactured by Lubrizol Advanced Materials * 3 Highly polymerized polyethylene oxide: Alcox E-100 ( Number average molecular weight 2.5 to 3 million), manufactured by Meisei Chemical Industry Co., Ltd. * 4 Polypropylene glycol: Adeca Carpole DL-80 (number average molecular weight 1000), manufactured by ADEKA * 5 Sodium carboxymethyl cellulose: CMC Daicel <1350>, Daicel FineChem * 6 Polypropylene glycol: New Pole PP-200 (number average molecular weight 200), manufactured by Sanyo Kasei Kogyo Co., Ltd. * 7 Polypropylene glycol: New Pole PP-4000 (number average molecular weight 4000), manufactured by Sanyo Kasei Kogyo Co., Ltd.

Claims (9)

The following components (A), (B), (C) and (D):
(A) Polymer thickening gelling agent,
(B) Highly polymerized polyethylene oxide having a number average molecular weight of 1 × 10 ^{5 to} 7 × 10 ^6.
(C) Polypropylene glycol having a number average molecular weight of 2 × 10 ² to 4 × 10 ^3.
(D) containing water,
The mass ratio of the component (C) said to component (B) is, ((C) / (B)) = 10 to 200 Ru der, gel shaving composition. The gel-like shaving agent composition according to claim 1, wherein the component (A) contains at least one selected from the group consisting of a carboxyvinyl polymer, an acrylic acid / alkyl methacrylate copolymer and a salt thereof. .. The gel-like shaving agent composition according to claim 2, further containing the component (F) carboxymethyl cellulose or a salt thereof as the component (A). The content of the component (A) is 0.04% by mass or more and 2% by mass or less in the total composition.
The content of the component (B) is 0.01% by mass or more and 0.3% by mass or less in the total composition.
The content of the component (C) is 0.7% by mass or more and 10% by mass or less in the total composition.
The gel-like shaving agent composition according to any one of claims 1 to 3, wherein the content of the component (D) is 70% by mass or more and 99% by mass or less in the total composition. Weight ratio of said component to said component (A) (B) is, ((B) / (A )) = a 0.005 to 0.35, gel according to any one of claims 1 to 4 Shaving agent composition. The gel-like shaving agent composition according to any one of claims 1 to 5, further comprising, as the component (E), a salt other than the component (A) in an amount of 0.05% by mass or more and 1% by mass or less in the total composition. thing. The gel-like shaving agent composition according to claim 6, wherein the mass ratio of the component (E) to the component (A) is ((E) / (A)) = 0.05 to 1. The component (F) contains carboxymethyl cellulose or a salt thereof as the component (A).
The gel-like shaving according to any one of claims 1 to 7, wherein the mass ratio of the component (F) to the entire component (A) is ((F) / (A)) = 0.05 to 1. Agent composition. A shaving method in which the gel-like shaving agent composition according to any one of claims 1 to 8 is applied to the skin, shaving, and then washed away.