JP2010215553A - Hydrogel external preparation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydrogel external preparation that solves sagging and adhesion to clothing in use, so-called dripping without reducing exudation property of solution from gel surface and sufficiently obtains sense of adhesion during use and sense of effect (sense of moisture retention) by permeation of water, etc., to the patched skin after use. <P>SOLUTION: The hydrogel external preparation includes at least a synthetic polymer having a network structure, a hydroxypropyl guar gum, a humectant, an exudation agent and water. The amount of hydroxypropyl guar gum contained is 0.05-3 pts.wt. in 100 pts.wt. of all hydrogel external preparation. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a hydrogel external preparation to be applied to a face, arm, foot or the like. More specifically, the present invention relates to a gel sheet for a cosmetic pack using a hydrogel external preparation.

  The hydrogel external preparation referred to in the present invention is an external preparation for hydrogel pack material containing a large amount of water. Mainly used as a gel sheet for cosmetic packs for skin care. This is because water containing medicinal ingredients contained in the gel is exuded by adding a slightly hydrophobic polyhydric alcohol to the gel surface, and the moisture retention effect is obtained by water permeating into the affixed skin. It is a feature.

  Conventionally, Patent Document 1 relates to a sheet-like pack agent, and contains water-soluble polymer, polyhydric alcohol, moisturizing component, crosslinking agent, skin-beautifying component, and water as essential components. Features. Here, gelatin and polyacrylate are described as the water-soluble polymer. Its effect is moderately sticky and moisturizing on the skin, and it is excellent in the stability of the physical properties of the preparation and the safety to the skin. It is.

  Patent Document 2 relates to a sheet-like pack agent for removing sebum, and a layer of a hydrous gel-like composition containing a crosslinked carboxyl group-containing polymer and / or a salt thereof is provided on at least one surface of a support. The layer of the water-containing gel-like composition further contains a polyhydric alcohol. Here, polyacrylic acid, polymethacrylic acid, polyitaconic acid, alginic acid, carboxymethylcellulose, gelatin, pectin, carboxymethylhydroxyethylcellulose, methoxyethylene maleic anhydride copolymer and the like are described as the carboxyl group-containing polymer.

  US Pat. No. 6,053,095 relates to a cosmetic composition that does not wash away, and contains in a cosmetically acceptable medium at least one guar gum and at least one silicone modified with an oxyalkylenated group, and a guar gum / silicone weight ratio. Is 5 or less.

  Patent Document 4 relates to a non-detergent cosmetic composition, wherein a cosmetically acceptable medium contains at least one nonionic guar gum and at least one non-crosslinked anionic polymer selected from predetermined copolymers. It is characterized by that.

Japanese Patent Laid-Open No. 08-188527 JP 2002-020257 A JP-A-8-231375 Japanese National Patent Publication No. 10-500703

  However, the water that oozes from the gel sheet is inherently low in viscosity, that is, has a very low viscosity, that is, a so-called free-flowing tactile sensation. The feeling (feeling of moisturizing) felt after use was not sufficient.

In this respect, since the publication of Patent Document 1 describes that more water is efficiently discharged to the outside during use, the concept of liquid leaching is included. Is not considered, and usability and usability are insufficient.
Patent Document 2 discloses a sheet form for removing sebum that can effectively remove excess sebum and dirt, and can remove only the excess sebum while replenishing moisture without causing pain when peeling from the skin. Although it relates to the pack agent, there is no description of liquid exudation and the moisturizing feeling is particularly insufficient.

Patent Document 3 is characterized in that it has particularly advantageous characteristics particularly in maintaining a hairstyle over time, and the effect as a gel pack material is not described in Examples. Therefore, there is no consideration for the state of the exudate and the usability and usability are insufficient.
Patent Document 4 describes an example of hair care in terms of content, and is an image of a gel for hair care, so the description of the gel skeleton (synthetic polymer having a network structure) and the like and the bleeding of liquid There is no description. Therefore, no consideration is given to the state of exudate.

  An object of the present invention is to solve the so-called dripping property that hangs down on use and does not decrease the exudability of the solution from the surface of the gel, and further, the adhesion feeling during use, and the skin applied after use The present invention provides a hydrogel external preparation that can sufficiently obtain an effect (moisturizing feeling) when permeated with water or the like, that is, a cosmetic sheet-like pack.

  As a result of diligent study, the present inventor has found that when an appropriate amount of hydroxypropylated guar gum obtained from the fruit of guar, which is a leguminous plant, is added in an appropriate amount, the exudability of the solution from the gel is not reduced. It has been found that the viscosity of the exuded solution is increased, and significant effects can be obtained with respect to the improvement of dripping, the feeling of adhesion during use, and the feeling of feeling felt after use (moisturizing feeling).

Thus, according to the present invention, a hydrogel external preparation containing at least a synthetic polymer having a network structure, hydroxypropyl guar gum, a wetting agent, an exuding agent, and water,
It is characterized in that 0.05 to 3 parts by weight of hydroxypropyl guar gum is contained in 100 parts by weight of the entire hydrogel external preparation.

  The hydrogel external preparation of the present invention increases the viscosity of the exuded solution without lowering the exudability of the solution from the gel, improves the dripping property, the feeling of adhesion during use, and the effect felt after use A remarkable effect is obtained with respect to (moisturizing feeling).

(Synthetic polymer)
The synthetic polymer is not particularly limited as long as it forms a network structure and can form a gel containing at least water. When the hydrogel is used as a transdermal application in the cosmetic field, a synthetic polymer acceptable in this field can be used. In particular, a synthetic polymer having an affinity for water is used, and among them, a synthetic polymer having an anionic functional group is preferably used. Examples of such synthetic polymers include polymers of polymerizable unsaturated monomers such as acrylic acid and methacrylic acid having a carboxyl group as a functional group, and salts thereof (for example, sodium salt, potassium salt, triglyceride). Ethanolamine salts, etc.), polymers of polymerizable unsaturated monomers such as t-butylacrylamide sulfonic acid having a sulfonic acid group as a functional group, and salts thereof (for example, sodium salts, potassium salts, etc.). . Preferably, sodium polyacrylate is used as the hydrophilic polymer. Moreover, it is preferable that 0.5-35 weight part is contained in 100 weight part of hydrogel external preparations (whole) as preferable content.

  The synthetic polymer before crosslinking may be partially crosslinked as long as it does not interfere with the production of the sheet-like hydrogel. In view of handling at the time of production, it is preferable to use a synthetic polymer before crosslinking having a weight average molecular weight in the range of 100,000 to 5,000,000.

(Crosslinking agent)
The network structure of the synthetic polymer can be obtained by crosslinking the synthetic polymer before crosslinking. That is, a network structure can be obtained by adding a crosslinking agent to the synthetic polymer before crosslinking and heating as necessary.
Examples of the crosslinking agent include aluminum hydroxide, potassium alum, aluminum sulfate, aluminum glycinate, aluminum acetate, aluminum oxide, aluminum metasilicate, magnesium chloride, calcium hydroxide, calcium carbonate, magnesium aluminate metasilicate, polyethyleneimine, Examples include polyethylene glycol diglycidyl ether, glycerin triglycidyl ether, and triglycidyl isocyanurate.
Moreover, it is preferable that 0.1-5 weight part is contained in 100 weight part of hydrogel external preparations (whole) as preferable content.

(PH adjuster)
In addition, in order to adjust the pH to the optimum value for the action of the cross-linking agent and to ensure the cross-linking, α-hydroxy acids such as tartaric acid, lactic acid and glycolic acid, inorganic acids such as citric acid and hydrochloric acids An acid may be used as a pH adjuster (sometimes referred to as an acid catalyst). The preferred pH range is 4-7.
It is preferable that 0.1-10 weight part is contained in 100 weight part of hydrogel external preparations (whole) as preferable content.
Although the hydrogel external preparation of this invention may be colored with the pigment | dye etc., it is preferable to have a transparent to substantially transparent external appearance. Transparency as used in the present invention means that transparency is ensured so that characters can be recognized when a gel sheet of a hydrogel external preparation is placed on white fine paper on which 20-point characters are printed in black. Preferably it is. In the gel sheet of the hydrogel external preparation of the present invention, a woven fabric having a sufficiently large opening ratio in the gel sheet or the purpose of improving the tear strength and handleability of the gel sheet without impairing the transparency of the gel sheet. It is preferable that the nonwoven fabric is contained in the thickness direction. In the present invention, a woven or non-woven fabric having a large opening ratio is one having a wide opening ratio (with transparency maintained) so that 20-point characters can be read through the woven or non-woven fabric. Say.
The gel sheet having a transparent to almost transparent appearance of the hydrogel preparation for external use of the present invention has an excellent appearance effect that the effect of improving the skin can be seen through the adhered gel sheet and it can be accurately applied to a predetermined site.
The thickness of the gel sheet of the hydrogel external preparation of the present invention may be uniform as a whole or partially different in thickness, but in order to ensure adhesion, transparency, and strength, it is preferable that the thickness of the gel sheet is 0. A thickness of 1 to 3 mm is preferred. If it is less than 0.1 mm, the strength of the gel sheet is weak, and if it exceeds 3 mm, the gel sheet may be too heavy and lack adhesion. If the entire gel sheet is not thick, it is possible to partially increase the gel sheet to a thickness of up to 6 mm.

(Hydroxypropyl guar gum)
Hydroxypropyl guar gum used in the present invention is a method of reacting sodium hydroxide and propylene oxide using guar gum, which is a natural water-soluble polymer polysaccharide, contained in the seed endosperm part of guar, which is a leguminous plant, as a raw material. Is a nonionic polymer obtained by substituting a hydroxyl group with a hydroxypropyl group.
Other cellulose ethers used as water-soluble thickeners, polysaccharides such as cellulose, guar gum, cationized guar gum, starch, xanthan gum and their derivatives, etc. for improving the dripping property of aqueous solution leached from the gel sheet It seems that it can be solved by increasing the viscosity of water etc. in the hydrogel by adding it, but the water retention of the gel itself will increase, and the exudation of the solution containing chemical components from the gel will be suppressed On the other hand, the viscosity of the exuded solution did not increase, and the tactile sensation remained free, and the above-mentioned improvement effect was not sufficient.

Hydroxypropyl guar gum is contained in an amount of 0.05 to 3 parts by weight in 100 parts by weight of a hydrogel external preparation (total). When the hydroxypropyl guar gum is less than 0.05 parts by weight in 100 parts by weight of the hydrogel external preparation (whole), the dripping property is not improved as compared with the one not containing hydroxypropyl guar gum, and in use. The feeling of adhesion is also reduced, and the moisturizing feeling felt after use is also reduced. When hydroxypropyl guar gum is contained in an amount exceeding 3 parts by weight in 100 parts by weight of the external preparation for hydrogel (whole), the sticky feeling appears so strongly that the feeling of use deteriorates. More preferably, the hydroxypropyl guar gum contains 0.1 to 2 parts by weight, optimally 0.2 to 1 part by weight, more optimally 0.3 parts by weight or more per 100 parts by weight of the hydrogel external preparation (total). It is.
In the present invention, a hydroxypropyl guar gum having a hydroxypropyl group substitution degree in the range of 0.4 to 1.2 is preferably used. The thing of 0.6-1.0 has a still higher effect, and is more preferable.

(Exudate)
The exuding agent is an agent used for effectively exuding the solution in the hydrogel to the hydrogel surface. Also called a solution leaching accelerator. For example, a nonionic water-soluble polymer that can effectively discharge water in the hydrogel or a network structure of the hydrogel is tightened by blending a substance that is hydrophilic but has a certain degree of hydrophobicity. By exhibiting the effect, an electrolyte that can exude a solution in the hydrogel to the surface of the hydrogel can be mentioned.

Examples of nonionic water-soluble polymers include glycols such as polyethylene glycol, polypropylene glycol, and polyglycerin, and polymers such as polyhydric alcohols. These can be used alone or in admixture of two or more.
The content of the nonionic water-soluble polymer is preferably 0.1 to 20 parts by weight, more preferably 1 to 10 parts by weight, per 100 parts by weight of the hydrogel external preparation (whole).

  In particular, when the moisture absorption of glycerin is 100, it is preferable to use a nonionic water-soluble polymer having a specific moisture absorption in the range of 2 to 55. If the specific moisture absorption is less than 2, the water retention capacity is not sufficient, so that the amount of solution exudation on the surface of the hydrogel becomes too large, causing stickiness, and the familiarity with the synthetic polymer constituting the hydrogel becomes poor. There is a risk that it may become difficult to form a hydrogel. If the specific moisture absorption is greater than 55, the water retention ability of the nonionic water-soluble polymer is too great, so that the solution in the hydrogel is difficult to ooze on the surface of the hydrogel, and the moisturizing and moisturizing effects may be insufficient. is there. A more preferable specific moisture absorption range is 20 to 45.

The electrolyte is easily water-soluble and can be used as long as it has a track record in cosmetics. However, neutral salts of strong acids and strong alkalis are used because of their low solubility and pH fluctuation. Preferably used. Examples of such an electrolyte include sodium chloride, potassium chloride, sodium sulfate, potassium sulfate and the like.
The preferable content of the electrolyte is 0.1 to 20 parts by weight, more preferably 0.2 to 5 parts by weight, in 100 parts by weight of the hydrogel external preparation (whole). Either the nonionic water-soluble polymer or the electrolyte may be blended alone, or both may be blended together.

(Wetting agent)
Examples of the wetting agent include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, glycerin, diglycerin, isopropylene glycol, 1,3-butylene glycol, sorbitol, malbitol, trehalose, raffinose, xylitol, mannitol. , Hyaluronic acid and its salts, various derivatives such as trehalose and raffinose, trimethylglycine, cyclodextrin, glycols such as hyaluronic acid and its salts, polyhydric alcohols and polysaccharides. These are preferably used alone or in admixture of two or more.
As preferable content, 1-30 weight part can be contained in 100 weight part of hydrogel external preparations (whole).

(Medicinal ingredients)
The medicinal ingredients that can be blended in the present invention are not particularly limited as long as they are conventionally used in pharmaceuticals, quasi drugs, cosmetics, hygiene materials, sundries, etc., for example, Ashitaba extract , Avocado extract, Achacha extract, Altea extract, Arnica extract, Apricot extract, Apricot kernel extract, Fennel extract, Turmeric extract, Oolong tea extract, Echinashi leaf extract, Ogon extract, Oat extract, Barley extract, Dutch mustard extract, Orange extract, Sea water Dried product, hydrolyzed elastin, hydrolyzed wheat powder, hydrolyzed silk, chamomile extract, carrot extract, cormorant extract, licorice extract, kiwi extract, kiwi extract, quina extract, cucumber extract, guanosine, kumazasa extract, walnut extract, Rape fruit extract, clematis extract, yeast extract, burdock extract, comfrey extract, collagen, bilberry extract, psycho extract, saitai extract, salvia extract, savanna extract, sasa extract, hawthorn extract, shiitake extract, shikon extract, shikon extract, linden extract , Citrus extract, shrimp root extract, birch extract, horsetail extract, honeysuckle extract, horseshoe extract, hawthorn extract, elderberry extract, sorghum extract, mint extract, mallow extract, sensu extract, thyme extract, thyme extract, clove Extract, chigaya extract, chimpi extract, spruce extract, dokudami extract, tomato extract, natto extract, carrot extract, wild rose extract Hibiscus extract, Bacmond extract, parsley extract, honey, Parietalia extract, toad extract, bisabolol, dandelion extract, fukinotou extract, bukuryo extract, butcher bloom extract, grape extract, propolis, loofah extract, peppermint extract, bodaiju extract, hop Extracts Extract, royal jelly extract and the like.

  In addition, biopolymers such as deoxyribonucleic acid, sodium chondroitin sulfate, collagen, elastin, chitin, chitosan, hydrolyzed eggshell membrane; moisturizing ingredients such as amino acids, urea, sodium pyrrolidonecarboxylate, betaine, whey, trimethylglycine; sphingolipids, Oil components such as ceramide, cholesterol, cholesterol derivatives, phospholipids; anti-inflammatory agents such as ε-aminocaproic acid, glycyrrhizic acid, β-glycyrrhetinic acid, lysozyme chloride, guaiazulene, hydrocortisone; vitamins A, B2, B6, D, E, Vitamins such as calcium pantothenate, biotin, nicotinamide; active ingredients such as allantoin, diisopropylamine dichloroacetate, 4-aminomethylcyclohexanecarboxylic acid; tocopherols, carotenoids, Antioxidants such as lavonoid, tannin, lignan and saponin; blood circulation promoters such as γ-oryzanol and vitamin E derivatives; wound healing agents such as retinol and retinol derivatives; cephalanthin, capsicum tincture, hinokitiol, garlic iodide extract, pyridoxine hydrochloride Dl-α-tocopherol, dl-α-tocopherol acetate, nicotinic acid, nicotinic acid derivatives, calcium pantothenate, D-pantothenyl alcohol, acetyl pantothenyl ethyl ether, biotin, allantoin, isopropylmethylphenol, estradiol, ethinyl esteradiol , Capronium chloride, benzalkonium chloride, diphenhydramine hydrochloride, takanal, camphor, salicylic acid, nonyl acid vanillylamide, nonanoic acid vanillylamide, piroctone Lamin, glyceryl pentadecanoate, mononitroguaiacol, resorcin, γ-aminobutyric acid, benzethonium chloride, mexiletine hydrochloride, auxin, female hormone, cantharis tincture, cyclosporine, hydrocortisone, polyoxyethylene sorbitan monostearate, analgesic, tranquilizer Antihypertensives, antibiotics, antihistamines, antibacterial substances and the like.

  The compounding amount of these components cannot be defined unconditionally because the amount of the active ingredient varies depending on the material, but is generally preferably 0.001 to 80% by mass relative to the mass of the sheet-form preparation, 0.05 to More preferably, it is 30% by mass.

(Production method)
For example, a mixture obtained by mixing at least a synthetic polymer, hydroxypropyl guar gum, a wetting agent, and water is further mixed with a crosslinking agent, an exudation agent, and water, and reacted. The manufacturing method of the hydrogel external preparation to do can be employ | adopted. Preferably, a production method characterized by adding a pH adjusting agent (acid catalyst) to adjust the pH of the mixed solution to 4 to 7 and reacting it can be adopted.
What is important here is that hydroxypropyl guar gum is added in advance to the synthetic polymer and wetting agent, hydroxypropyl guar gum is dissolved, and then a crosslinking agent and an exuding agent are added. In other words, it is desirable to add hydroxypropyl guar gum before gel formation. If hydroxypropyl guar gum is added after making a gel, the number of steps increases, so the cost is high and the pack cannot be made homogeneous. That is, when hydroxypropyl guar gum is added after the gel has been prepared, it is difficult to uniformly disperse the hydroxypropyl guar gum that is a solid on the gel surface. For example, when it is added as an aqueous solution, it is highly viscous. It is difficult to disperse uniformly. On the other hand, even if a low-concentration aqueous solution is prepared and added in order to reduce the viscosity, the characteristics (usability and effect) required by excess water cannot be obtained. In addition, when it cannot be uniformly dispersed, the viscosity of the exudate varies, and it is not preferable because the required characteristics cannot be obtained, such as partial peeling or local moisturizing effect.

For example, 0.5 to 35 parts by weight of the synthetic polymer, preferably 1 to 30 parts by weight, more preferably 2 to 25 parts by weight, and 0.05 to 3 parts by weight of hydroxypropyl guar gum, preferably 0.1 to 2 parts by weight, more preferably 0.2 to 1 part by weight, 1 to 30 parts by weight of wetting agent, preferably 2 to 20 parts by weight, and 0.1 to 5 parts by weight of crosslinking agent, preferably 0. 5 to 2 parts by weight, 0.1 to 20 parts by weight of exuding agent, preferably 1 to 10 parts by weight when the exuding agent is a nonionic polymer, and 0.2 to 0.2 when the exuding agent is an electrolyte. It is a manufacturing method of the hydrogel external preparation characterized by adding 5 weight part and mixing and making it react.
Here, more preferably, it is a method for producing a hydrogel external preparation characterized by adding a pH adjuster (acid catalyst) to adjust the pH of the mixed solution to 4 to 7 and reacting it. .

  In addition, it is preferable to add 60 to 97 parts by weight of water in total, preferably 70 to 95 parts by weight. A part of the water is preferably added to the mixture of the crosslinking agent and the exuding agent and added as a mixed solution.

  Hereinafter, although an example and a comparative example explain the present invention, the present invention is not limited to this.

(Example)
Using the gel-forming composition shown in the following table, gel sheets of Examples and Comparative Examples used for cosmetic packs were prepared according to the following procedure. A wetting agent was added to the synthetic polymer and hydroxypropyl guar gum (HP guar gum) or other thickening agent, and water was further added and kneaded until uniform. To this mixture, an exuding agent, a crosslinking agent and water were added and dispersed well to obtain a slurry. Further, a pH adjusting agent (acid catalyst) was added to make the pH 5-6, and the mixture was made into a total of 100 parts. Stir. Next, spacers with a thickness of 1 mm are placed at the four corners of a 38 μm-thick PET film placed on a smooth glass plate, and an appropriate amount of the above composition is poured into the central portion immediately after mixing, and a basis weight of 17 g / m ² A nylon knitted fabric (Tricot half) and another 38 μm-thick PET film were stacked, sandwiched between glass plates and allowed to stand for 24 hours to obtain a gel sheet of a hydrogel external preparation having a thickness of 1 mm. This gel sheet was cut into 5 cm × 5 cm to obtain a sample for evaluation.

The amount of liquid leaching from the gel sheet was measured as follows.
The gel sheet is taken out from the bag immediately before the measurement, the PET film on both sides is peeled off, the weight (a) is measured, and then the PET film is pasted only on one side. Two glass plates (100 × 100 mm, 3 mm thick) and filter paper (5A diameter 150 mm circle made by Advantech) are prepared, and the weight (b) of the filter paper is measured and placed on one glass plate. A gel sheet is attached to the center of the filter paper with the gel surface facing down, and another glass plate is placed on the gel sheet and allowed to stand for 10 minutes. Thereafter, the PET film on the glass plate and the gel sheet is removed, the gel is further removed, and the weight (c) of only the circular filter paper is measured. From the difference from the filter paper weight measured in advance, the weight of the exuded liquid is calculated. calculate. This liquid amount is expressed as a ratio with respect to the original gel weight and is defined as an exudation amount ((c−b) / a). As the measured value, an average value obtained by performing the same test on three gels is used.
If the amount of exudation is small, the adhesion to the skin will be reduced, so it will be easily peeled off during use, and the amount of liquid that penetrates the skin will be small, so the effect of moisturizing will be insufficient. Since it falls or excessive liquid drips (drip) and adheres to clothes etc., the preferable range of the amount of exudation is 20-35 (%).

[Evaluation as a pack agent]
After the gel sheet formed as described above is applied to the cheeks of 10 female subjects with the upper body raised and evaluated for adhesion and liquid dripping when left for 20 minutes, and after peeling off after 20 minutes The moisturizing feeling of the skin condition was expressed in the following five stages 1 to 5, evaluated as the usability and effect as a pack agent, and the evaluation result was obtained with the total score of all subjects. Therefore, the values of these evaluations indicate the magnitude of performance and effect (full score 50 points). The results are shown in the table.

Feeling of effect (moisturizing feeling) Evaluation 5: I feel that the skin is remarkably moisturized.
4: I feel that the skin is moisturized.
3: The skin feels slightly moisturized.
2: The skin feels slightly moisturized.
1: The effect is not felt.

Usability (Liquid Drip) Evaluation 5: No dripping at all.
4: There is slight dripping.
3: There is a little dripping.
2: There is much dripping.
1: Too much liquid dripping, so that the exuded liquid adheres to clothes.

Usability (Adhesiveness) Evaluation 5: The skin is completely adhered and there is no deviation.
4: Almost in close contact with the skin, with little deviation.
3: There is a part that is not in close contact with the skin, and there is a slight deviation.
2: It is difficult to adhere to the skin and there are many deviations.
1: The displacement falls greatly.

From Table 1, the gel sheets of the examples are suitable for the amount of exudation and superior in usability (fluidity and adhesion) and effect (moisturizing feeling) compared with Comparative Example 1 in which no HP guar gum is added. .
On the other hand, in the case of Comparative Examples 3 to 5 of guar gum, cationized guar gum, and xanthan gum as other thickeners, the amount of exudation is appropriate, but the liquid dripping property and adhesion are insufficient, and the moisturizing feeling is insufficient. is doing. In the case of Comparative Examples 6 and 7 of hydroxyethyl cellulose and sodium hyaluronate as other thickeners, the liquid dripping property is good, but the amount of exudation is insufficient, the adhesion is lowered, and the moisturizing feeling is insufficient.

  In the case of Examples 1 to 3 in which the substitution degree of HP guar gum is 0.4 to 1.2, the amount of exudation is appropriate, and usability (sagging and adhesion) and effect (moisturizing feeling) are excellent. ing. However, in the case of Comparative Example 2 in which the HP guar gum is less than 0.05 parts by weight relative to 100 parts by weight of the entire hydrogel external preparation, the amount of exudation is appropriate because the amount of HP guar gum is too small. As compared with Comparative Example 1 which is 0, the liquid dripping property and the adhesiveness are further insufficient, and the effect is insufficient. In the case of Example 4 where the HP guar gum is 0.05 parts by weight or more with respect to 100 parts by weight of the entire hydrogel external preparation, the amount of exudation is appropriate, the usability (sagging and adhesion), and the feeling of feeling (moisturizing) Feeling) is excellent. On the contrary, in the case of Example 5 where HP guar gum is 3 parts by weight with respect to 100 parts by weight of the entire hydrogel external preparation, the amount of exudation is appropriate, usability (fluidity, adhesion), and feeling of feeling (moisturizing feeling) ) Is excellent.

INDUSTRIAL APPLICABILITY The present invention can be used as a hydrogel external preparation applied to the face, arms, feet, etc., and is useful as a gel sheet for a cosmetic pack for skin care using the hydrogel external preparation.

Claims (3)

A hydrogel external preparation containing at least a synthetic polymer having a network structure, hydroxypropyl guar gum, a wetting agent, an exuding agent, and water, and in 100 parts by weight of the entire hydrogel external preparation, hydroxypropyl guar gum Is contained in an amount of 0.05 to 3 parts by weight.   The hydrogel external preparation according to claim 1, wherein 0.1 to 20 parts by weight of the exuding agent is contained in 100 parts by weight of the entire hydrogel external preparation. It is a manufacturing method of the hydrogel external preparation of Claim 1,
Hydropropyl guar gum is added in advance to the synthetic polymer, wetting agent and water, hydroxypropyl guar gum is dissolved, and then this mixture is mixed with a cross-linking agent and an exudating agent and mixed to produce a hydrogel preparation for external use. Method.