JP2005145835A - Protective pack cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prepare a pack cosmetic readily peeling off without imparting irritation to skin. <P>SOLUTION: This cosmetic is obtained by containing a polyurethane represented by formula (1) [wherein, (m) and (l) denote each independently an integer of 2-10; R1 and R2 denote each independently a 1-4C alkylene group; R3 denotes a 1-4C alkyl group; R4 denotes a meaning in which a substituent is absent or denotes hydrogen atom or a 1-4C alkyl group having an anion moiety; A denotes a phenylene group; (n) and (p) denote each independently a number of 10-1,000; and a mark N+(N) means to be either a cationic nitrogen atom or a nitrogen atom without dissociation into ion]. The content of the polyurethane is preferably 1-10 mass%. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pack cosmetic, and more particularly, to a pack cosmetic with less irritation and excellent film forming / peeling function.

  Packed cosmetics are cosmetic dosage forms that occlude the skin with a film made of a film-forming agent composed of a polymer, etc., promote transdermal absorption of active ingredients, and promote the metabolism of the skin by the occlusion effect. . As a film-forming agent that normally forms a film having such a blocking property, a film is formed in a relatively short time by using a polyvinyl acetate emulsion and polyvinyl alcohol together, and a film having moderate flexibility is realized. It has become. However, since such a film is highly water-soluble, the film swells and softens when it is easy to sweat, such as in summer, and loses strength, making it difficult to peel off. Even without this, there was a drawback that the film component was easily stuck without being peeled off due to adhesion to the skin due to moisture contained in the skin itself. Against this background, various studies have been made to enhance the peel-off properties of pack cosmetics.For example, a cosmetic containing a cationic substance is applied to the skin in advance before the pack, A method of facilitating peeling by forming a paired ion with an anionic portion of a coating portion in contact (see, for example, Patent Document 1) has been devised. However, the application of a cationic substance to the skin and the application of a pack cosmetic on the skin significantly increases the skin irritation of the cationic substance, which is currently considered to be relatively high irritation in cosmetic ingredients. It was difficult to say that it was possible to increase the level and was preferable. That is, it has been desired to develop a pack cosmetic that can be easily peeled off without irritating the skin. On the other hand, several types of polyurethane compounds have been developed for cosmetics in recent years, but these are extremely safer than conventional cationic substances and are used in nail treatments and hair treatments. Yes. (For example, see Patent Document 2, Patent Document 3, Patent Document 4, and Patent Document 5) However, polyurethane compounds are not used at all as film forming agents for pack cosmetics. In addition, the polyurethane compound represented by the following general formula (1) is not known at all, and therefore, it is not known at all to use this for a pack cosmetic.

  As a technique for using a polyurethane compound as a pack material, it is only known that a polyurethane compound sheet is used in an indicator-tight manner in a pack type pack material. (For example, see Patent Document 6)

Japanese Patent Application Laid-Open No. 08-59451 JP 2002-105161 A Japanese National Patent Publication No. 10-509742 JP-T-08-504454 JP 2000-86492 A JP 2000-72619 A

  The present invention has been made under such circumstances, and an object of the present invention is to provide a pack cosmetic that can be easily peeled off without irritating the skin.

In view of such a situation, the present inventors have sought for a pack cosmetic that can be easily peeled off without irritating the skin, and as a result of intensive research efforts, the following is expressed by the following general formula (1). The present invention was completed by finding that such a pack cosmetic containing polyurethane has such an action. That is, this invention relates to the technique shown below.
(1) A pack cosmetic comprising a polyurethane represented by the following general formula (1).

一般式（１）
（但し、式中ｍ、ｌはそれぞれ独立に、２〜１０の整数を表し、Ｒ１、Ｒ２はそれぞれ独立に炭素数１〜４のアルキレン基を表し、Ｒ３は炭素数１〜４のアルキル基を表し、Ｒ４は置換基が存在しない意味を表すか、アニオン部分を有する、水素原子又は炭素数１〜４のアルキル基を表し、Ａはフェニレン基を表し、ｎ、ｐはそれぞれ独立に１０〜１０００の数をあらわす。又、Ｎ＋（Ｎ）の表記はカチオン性の窒素原子でも、イオン解離性を有しない窒素原子でも可であることを意味する。）

General formula (1)
(In the formula, m and l each independently represents an integer of 2 to 10, R 1 and R 2 each independently represents an alkylene group having 1 to 4 carbon atoms, and R 3 represents an alkyl group having 1 to 4 carbon atoms. R4 represents a meaning that no substituent exists, or represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms having an anion portion, A represents a phenylene group, and n and p each independently represent 10 to 1000. In addition, the notation of N + (N) means that either a cationic nitrogen atom or a nitrogen atom having no ion dissociation property is acceptable.)

(2) The pack cosmetic according to (1), wherein the polyurethane represented by the general formula (1) is represented by the following general formula (2).

一般式（２）
（但し、式中ｍ、ｌはそれぞれ独立に、２〜１０の整数を表し、Ｒ１、Ｒ２はそれぞれ独立に炭素数１〜４のアルキレン基を表し、Ｒ３は炭素数１〜４のアルキル基を表し、Ａはフェニレン基を表し、ｎ、ｐはそれぞれ独立に１０〜１０００の数をあらわす。又、Ｎ＋（Ｎ）の表記はカチオン性の窒素原子でも、イオン解離性を有しない窒素原子でも可であることを意味する。）

General formula (2)
(In the formula, m and l each independently represents an integer of 2 to 10, R 1 and R 2 each independently represents an alkylene group having 1 to 4 carbon atoms, and R 3 represents an alkyl group having 1 to 4 carbon atoms. A represents a phenylene group, and n and p each independently represent a number of 10 to 1000. The notation of N + (N) may be a cationic nitrogen atom or a nitrogen atom having no ion dissociation properties. Means.)

(3) The pack according to (1) or (2), wherein the polyurethane represented by the general formula (1) or the general formula (2) is represented by the following chemical formula 1: Cosmetics.

化合物１

Compound 1

(4) The content of the polyurethane represented by the general formula (1) to the general formula (2) is 1 to 10% by mass, according to any one of (1) to (3), Pack cosmetics.
(5) The pack cosmetic according to any one of (1) to (4), wherein the pack cosmetic is administered to the skin.
(6) The pack cosmetic according to (5), wherein the purpose of administration is moisturizing or improving the skin barrier function.
(7) The pack cosmetic according to any one of (1) to (6), further comprising an antibacterial polyhydric alcohol.
(8) The antibacterial polyhydric alcohol is selected from isoprene glycol, 1,2-pentanediol, 1,2-hexanediol, 2,4-hexylene glycol, 1,2-octanediol and dipropylene glycol The pack cosmetic according to (7), characterized in that
(9) The pack cosmetic according to any one of (1) to (8), further comprising phenoxyethanol.

  ADVANTAGE OF THE INVENTION According to this invention, the pack cosmetics which can be peeled off easily without giving irritation | stimulation to skin can be provided.

(1) The polyurethane represented by the general formula (1), which is an essential component of the pack cosmetic of the present invention. The pack cosmetic of the present invention contains a polyurethane represented by the general formula (1). And The compound represented by the general formula (1) is represented by the polyurethane represented by the general formula (2) containing a tertiary nitrogen atom and the following general formula (3) in which the nitrogen atom is quaternized. However, any of these can be used in the pack cosmetic of the present invention, and the polyurethane represented by the general formula (2) is particularly preferable. Such polyurethane can be produced according to a known method for producing a urethane resin emulsion. The simplest production method includes a method in which a urethane prepolymer having a molecular weight of about 5000 to 20000 is produced and then chain-extended after neutralization water dilution to increase the molecular weight. As a method for producing a urethane prepolymer, there is a method in which a polyol, a polyisocyanate, and a tertiary amine-containing active hydrogen-containing compound are mixed and reacted at the same time to urethanize, but the polyol and polyisocyanate are first reacted in that there are few side reactions. A method of reacting active hydrogen with a tertiary amine-containing compound and then urethanizing is more preferable. The urethanization reaction can be easily carried out by heating at a reaction temperature of 40 to 100 ° C. for 2 to 8 hours in a solvent-free or organic solvent in the presence or absence of a catalyst and stirring half. . By performing such an operation, the polyurethane represented by the general formula (2) can be produced. By reacting the polyurethane represented by the general formula (2) thus obtained with a quaternizing agent such as diethyl sulfate, the tertiary nitrogen atom having the active hydrogen can be quaternized. A raw material for the polyurethane represented by the general formula (3) can be obtained. That is, after completion of the urethane prepolymerization, a neutralizing agent is added to neutralize or quaternize amine groups. Next, the emulsification can be carried out by either adding and mixing water while stirring the neutralized composition, or adding and mixing the neutralized composition while mixing vigorously in water. Further, after emulsification, the isocyanate in the liquid composition is chain-extended with an active hydrogen-containing compound to polymerize, and the reaction is completed.

  Specific examples of the polyisocyanate include, for example, ethylene diisocyanate, 1,6-hexamethylene diisocyanate, 2,2,4-trimethylhexanehexanemethylene diisocyanate, aliphatic diisocyanate such as lysine diisocyanate, isophorone diisocyanate, water addition 4, 4 -Alicyclic diisocyanates such as diphenylmethane diisocyanate, methylcyclohexylene diisocyanate, isopropylidene dicyclohexyl-4,4-diisocyanate, fragrances such as 4,4, -diphenylmethane diisocyanate, xylidene diisocyanate, tetramethylxylidene diisocyanate, tolylene diisocyanate Group diisocyanate and the like. In particular, isophorone diisocyanate is preferable from the viewpoint of control of reactivity.

  As said polyol component, what is generally used for manufacture of a polyurethane, or what can be used can be used. In particular, as a typical example only, polyester polyols such as dicarboxylic acids (adipic acid, azelaic acid, sebacic acid, succinic acid, glutaric acid, maleic acid, fumaric acid, phthalic acid, isophthalic acid, terephthalic acid, etc.) And glycol (ethylene glycol, propylene glycol, 1,4-butanediol, i, 3-butanediol, 1,6-hexanediol, 1,8-octamethylenediol, neopentyl glycol, bishydroxymethylcyclohexane, bishydroxyethylbenzene , Alkyl dialkanolamine, etc.) obtained by polycondensation such as polyethylene adipate, polybutylene adipate, polyhexamethylene diadipate, polyethylene / propylene adipate; by lactone ring-opening polymerization Polylactone diols such as polycaprolactone diol, polyvalerolactone diol and the like, as well as polyether polyols such as alkylene oxides of low molecular weight glycols (ethylene glycol, propylene glycol, 1,4-butanediol, etc.) (alkylene oxides having 2 to 4 carbon atoms) For example, ethylene oxide, propylene oxide, butylene oxide, etc.) adducts and ring-opening polymerization products of the alkylene oxide, specifically, polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol and the like.

  These polyol components may be used singly or in combination of two or more. In particular, phthalic acid, isophthalic acid, and a polyester polyol that is a polycondensate of terephthalic acid and glycol are preferred in terms of improving optical properties.

  Moreover, in the meaning which improves water resistance, combined use of polydimethyl polysiloxane diol, polydimethyl polysiloxane diamine, etc. is preferable as a compound which has a dimethyl polysiloxane structure in a principal chain.

  Examples of cationic water-soluble components include N-methyldiethanolamine, N-methyldiethanolamine, N-methyldiethanolamine, N-methyldiethanolamine, N-methyldiethanolamine, -N-alkyl dialkanolamine compounds such as butyldiethanolamine, and the like.

  A preferable blending ratio of the polyol component and the polyisocyanate component is a ratio in which the isocyanate groups in the polyisocyanate are excessive from the total amount of hydroxyl groups in the polyol mixture. Specifically, 4 to 4 hydroxyl groups per mole of isocyanate groups. A ratio of 0.9 mol is preferable, and more preferably 0.5 to 0.7 mol. When the proportion of the hydroxyl group is less than 0.4 mol, the proportion of the unreacted polyisocyanate increases, and when it exceeds 0.9 mol, the molecular weight becomes too large and water-solubilization becomes difficult.

  As for the ratio of the polyol component which has a tertiary amine group, it is desirable that it is 2 to 15% of the urethane prepolymer finally produced | generated. If it is less than 2% by weight, the resulting emulsion may become unstable in water, and if it exceeds 15% by weight, the hydrophilicity of the urethane prepolymer may become strong and gel may occur.

  The organic solvent used in the urethane prepolymer reaction is not particularly limited, but a water-soluble organic solvent is preferable from the solubility of the product. Specific examples include acetone, N-methyl-2-pyrrolidone, dimethylformamide, And methyl ethyl ketone. A solvent having an active hydrogen such as a hydroxyl group or a carboxyl group is not preferable because it reacts with isocyanate.

  The catalyst that can be used in the urethanized prepolymer reaction may be an ordinary urethane catalyst, such as triethylenediamine, triethylamine, N-methylmorpholine, N.I. N. Tertiary amines such as N, N-tetramethyl-propylenediamine, amidines such as 1,8-diazabicyclo (5,4,0) -undecene-7, tin compounds such as tin octenoate and dibutyltin acetate, or Ti, Examples thereof include metal salts such as Na, KV, Fe, Mn, and Pb. The addition amount of the catalyst is preferably 0.0001 to 0.001 part with respect to 100 parts of each raw material.

  As described above, the urethane prepolymerization reaction can be easily performed by heating to a half temperature for 2 to 8 hours at a reaction temperature of 40 to 100 ° C. After completion of the urethane prepolymerization reaction, the mixture is neutralized and then diluted with water to carry out chain extension.

  The neutralizing agent is not particularly limited, but organic carboxylic acids such as formic acid, acetic acid and oxalic acid are preferred. Quaternization with diethylaminosulfuric acid, dimethylaminosulfuric acid or the like is preferable in terms of facilitating water-solubilization.

  As chain extenders, as in the usual urethane reaction, low molecular glycols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, and ethylenediamine, propylenediamine, butylenediamine, hexamethylene. Diamine. Aliphatic diamines such as 2,2,4-trimethylhexamethylene diamine, isophorone diamine dicyclohexyl methane 4,4-diamine, isopropylidene dicyclohexyl-4,4-diamine, alicyclic diamines such as 1,4-diaminocyclohexane, water Active hydrogen atom-containing low molecular weight compounds such as

  As a usage-amount of a chain extension material, 0.01-0.4 mol is preferable with respect to 1 mol of isocyanate groups in the polyisocyanate used for manufacture of a urethane prepolymer. If the amount of chain extender used is less than 0.01, the molecular weight is low and sufficient film strength cannot be obtained. When it exceeds 0.4 mol, the molecular weight of the urethane polymer becomes too high, and the resulting emulsion may become unstable.

一般式（３）
（但し、式中ｍ、ｌはそれぞれ独立に、２〜１０の整数を表し、Ｒ１、Ｒ２はそれぞれ独立に炭素数１〜４のアルキレン基を表し、Ｒ３は炭素数１〜４のアルキル基を表し、Ｒ５はは水素原子又は炭素数１〜４のアルキル基を表し、Ａはフェニレン基を表し、Ｂは窒素原子の陽イオンと対となる陰イオン基を含む基を表し、ｎ、ｐはそれぞれ独立に１０〜１０００の数をあらわす。）

General formula (3)
(In the formula, m and l each independently represents an integer of 2 to 10, R 1 and R 2 each independently represents an alkylene group having 1 to 4 carbon atoms, and R 3 represents an alkyl group having 1 to 4 carbon atoms. R5 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, A represents a phenylene group, B represents a group containing an anion group paired with a cation of a nitrogen atom, and n and p are Each number is independently 10 to 1000.)

化学式２

Chemical formula 2

<Production Example 1>
In a reactor equipped with a reflux condenser, a thermometer, and a stirring device, 62.6 g (0.031 mol) of isophthalone diisocyanate having a molecular weight of 1800, Elitel UE-3320 (manufactured by Unitika Ltd.), 29.4 g (0. 132 mol), 0.0002 g of dibutyltin laurate and 50 g of N-methyl-2pyrrolidone were added and a urethanization reaction was carried out at 80 ° C. for 2 hours to produce a prepolymer. Further, 6.0 g (0.045 mol) of N-methyldiethanolamine was added to this reaction solution, and the reaction was further continued for 2 hours. As a result, 148.0 g (solid content: 66.2% by weight) of urethane prepolymer was obtained. (Hereinafter referred to as prepolymer A.) After cooling this solution to 40 ° C., 250 g of water was added to obtain a dispersion. Thereafter, methyl ethyl ketone was removed under reduced pressure, water was added to adjust the solid content concentration, the resin solid content concentration was 25%, and the viscosity was 40 mPa.s. A self-emulsifying emulsion 1 at s / 25 ° C. was obtained. (Structure represented by general formula (2))

<Production Example 2>
In a reactor equipped with a reflux condenser, a thermometer, and a stirring device, 62.6 g (0.031 mol) of isophthalone diisocyanate having a molecular weight of 1800, Elitel UE-3320 (manufactured by Unitika Ltd.), 29.4 g (0. 132 mol), 0.0002 g of dibutyltin laurate and 50 g of N-methyl-2pyrrolidone were added and a urethanization reaction was carried out at 80 ° C. for 2 hours to produce a prepolymer. Further, 6.0 g (0.045 mol) of N-methyldiethanolamine was added to this reaction solution, and the reaction was further continued for 2 hours. As a result, 148.0 g (solid content: 66.2% by weight) of urethane prepolymer was obtained. (Hereinafter referred to as prepolymer A.) Next, 5.9 g of diethyl sulfate and 30 g of methyl ethyl ketone were added to this prepolymer A and reacted at 80 ° C. for 2 hours to complete the quaternization. After cooling this solution to 40 ° C., 250 g of water was added to obtain a dispersion. Thereafter, methyl ethyl ketone was removed under reduced pressure, water was added to adjust the solid content concentration, the resin solid content concentration was 25%, and the viscosity was 40 mPa.s. A self-emulsifying emulsion 2 at s / 25 ° C. was obtained. (Structure represented by the general formula (3))

  In the pack cosmetic of the present invention, the polyurethanes represented by the general formulas (1) to (3) can be produced and used as described above, but there are polymer emulsions that are already on the market. Can be purchased and used. As commercial products, WBR610 (made by Taisei Kako Co., Ltd .; solid content 25%), which is an emulsion of polyurethane represented by Chemical Formula 1, WBR2025 (made by Taisei Kako Co., Ltd .; solid), which is a polyurethane emulsion represented by Chemical Formula 2. 25%) is particularly preferred. It is preferable to use such a commercial product because the physical properties are stable.

  Although the polyurethane compound thus obtained is water-soluble, once it forms a film, it is difficult to hydrate and swell, and even when placed on the skin, it absorbs moisture in the skin and reduces the film strength. Almost no. In addition, since it is excellent in peelability from the skin and the stimulation of the polymer itself to the skin is extremely low, it can be easily peeled off without giving a feeling of irritation even when packed. In order to exert such an action, the polyurethane compound is preferably contained in an amount of 1 to 10% by weight, more preferably 2 to 5% by weight as a solid content with respect to the total amount of the cosmetic.

(2) Pack cosmetic of the present invention The pack cosmetic of the present invention is characterized by containing a polyurethane represented by the general formula (1) as an essential component. The pack cosmetic of the present invention is characterized in that the purpose of administration is moisturizing or improving the skin barrier function. This is because the polyurethane represented by the general formula (1), which is the essential component, complements the function-reduced portion of the skin, prevents water dispersion from the skin, and undesired substances such as irritants enter. Has the effect of preventing For this reason, it is preferable to apply to the pack cosmetic used for the purpose of such skin conditioning. Specifically, pack cosmetics such as lotion, essence, milky lotion and cream can be suitably exemplified. In the pack cosmetic of the present invention, in addition to the essential components, optional components usually used in pack cosmetics can be contained. Such optional ingredients include, for example, macadamia nut oil, avocado oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, safflower oil, cottonseed oil, jojoba oil, coconut oil, palm oil, liquid lanolin, hydrogenated coconut oil Oils such as hardened oil, mole, hardened castor oil, beeswax, candelilla wax, carnauba wax, ibotarou, lanolin, reduced lanolin, hard lanolin, jojoba wax, waxes, liquid paraffin, squalane, pristane, ozokerite, paraffin, ceresin, petrolatum , Hydrocarbons such as microcrystalline wax, higher fatty acids such as oleic acid, isostearic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, undecylenic acid, cetyl alcohol, stearyl alcohol, isostearyl Alcohol, behenyl alcohol, octyldodecanol, higher alcohol such as myristyl alcohol, cetostearyl alcohol, cetyl isooctanoate, isopropyl myristate, hexyldecyl isostearate, diisopropyl adipate, di-2-ethylhexyl sebacate, cetyl lactate, malic acid Diisostearyl, di-2-ethylhexanoic acid ethylene glycol, dicaprate neopentyl glycol, di-2-heptylundecanoic acid glycerin, tri-2-ethylhexanoic acid glycerin, tri-2-ethylhexanoic acid trimethylolpropane, tri Synthetic ester oils such as trimethylolpropane isostearate and pentane erythritol tetra-2-ethylhexanoate, dimethylpolysiloxane, methylphenylpoly Loxane, linear polysiloxane such as diphenylpolysiloxane, cyclic polysiloxane such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexanesiloxane, amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, Oil agents such as silicone oil such as modified polysiloxane such as fluorine-modified polysiloxane, anionic surfactants such as fatty acid soap (sodium laurate, sodium palmitate, etc.), potassium lauryl sulfate, triethanolamine ether of alkyl sulfate, chloride Cationic surfactants such as stearyltrimethylammonium, benzalkonium chloride, laurylamine oxide, imidazoline-based amphoteric surfactants (2-cocoyl-2-imida Zolinium hydroxide-1-carboxyethyloxy disodium salt, etc.), betaine surfactants (alkyl betaine, amide betaine, sulfobetaine, etc.), amphoteric surfactants such as acylmethyltaurine, sorbitan fatty acid esters (sorbitan) Monostearate, sorbitan sesquioleate, etc.), glycerin fatty acids (glyceryl monostearate, etc.), propylene glycol fatty acid esters (propylene glycol monostearate, etc.), hardened castor oil derivatives, glycerin alkyl ethers, POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbite fatty acid esters (POE-sorbitol monolaurate, etc.), POE glycerin fatty acid ester Tells (POE-glycerol monoisostearate, etc.), POE fatty acid esters (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE2-octyldodecyl ether, etc.), POE alkyl phenyl ethers (POE nonylphenyl) Ethers, etc.), Pluronic types, POE / POP alkyl ethers (POE / POP2-decyltetradecyl ether, etc.), Tetronics, POE castor oil / hardened castor oil derivatives (POE castor oil, POE hardened castor oil, etc.), Nonionic surfactants such as sucrose fatty acid ester and alkyl glucoside, polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, propylene Polyols such as recall, dipropylene glycol, diglycerin, isoprene glycol, 1,2-pentanediol, 2,4-hexylene glycol, 1,2-hexanediol, 1,2-octanediol, pyrrolidone carvone Moisturizing ingredients such as sodium acid, lactic acid, sodium lactate, guar gum, quince seed, carrageenan, galactan, gum arabic, pectin, mannan, starch, xanthan gum, curdlan, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, methylhydroxypropylcellulose, chondroitin Sulfuric acid, dermatan sulfate, glycogen, heparan sulfate, hyaluronic acid, sodium hyaluronate, gum tragacanth, keratan sulfate, chondroitin, mucoitin sulfate, Hydroxyethyl guar gum, carboxymethyl guar gum, dextran, keratosulfuric acid, locust bean gum, succinoglucan, carolinic acid, chitin, chitosan, carboxymethylchitin, agar, polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, sodium polyacrylate, polyethylene Thickeners such as glycol and bentonite, surface may be treated, powders such as mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, silicic anhydride (silica), aluminum oxide, barium sulfate , Surface may be treated, bengara, yellow iron oxide, black iron oxide, cobalt oxide, ultramarine, bitumen, titanium oxide, zinc oxide inorganic pigments, surface may be treated, titanium mica, fish Phosphor foil, bisma oxychloride Pearl agents such as red 202, red 228, red 226, yellow 4, blue 404, yellow 5, red 505, red 230, red 223, orange No. 201, Red No. 213, Yellow No. 204, Yellow No. 203, Blue No. 1, Green No. 201, Purple No. 201, Red No. 204 and other organic dyes, polyethylene powder, polymethyl methacrylate, nylon powder, organopolysiloxane Organic powders such as elastomers, paraaminobenzoic acid UV absorbers, anthranilic acid UV absorbers, salicylic acid UV absorbers, cinnamic acid UV absorbers, benzophenone UV absorbers, sugar UV absorbers, 2- Purple such as (2′-hydroxy-5′-t-octylphenyl) benzotriazole, 4-methoxy-4′-t-butyldibenzoylmethane Linear absorption agents, ethanol, lower alcohols such as isopropanol, vitamin A or its derivatives, vitamin B ₆ hydrochloride, vitamin B ₆ tripalmitate, vitamin B ₆ dioctanoate, vitamin B ₂ or derivatives thereof, vitamin B _12, vitamin B ₁₅ or vitamin B such derivatives thereof, alpha-tocopherol, beta-tocopherol, .gamma.-tocopherol, vitamin E such as vitamin E acetate, vitamin D, vitamin H, pantothenic acid, pantethine, pyrroloquinoline vitamins quinone such Preferred examples include preservatives such as methylparaben, ethylparaben, propylparaben, butylparaben, hibitengluconate, benzalkonium chloride and phenoxyethanol. Among these, polyhydric alcohols which are preferably contained are polyhydric alcohols which act as bacteriostatic or bactericidal, and are called antibacterial polyhydric alcohols. Such antibacterial polyhydric alcohols include propylene glycol, 1,3-butanediol, isoprene glycol, 1,2-pentanediol, 1,2-hexanediol, 2,4-hexylene glycol, 1,2-heptanediol. 1,2-octanediol, 1,2-decanediol, dipropylene glycol and the like. 1,3-butanediol, isopreneglycol, 1,2-pentanediol, 1,2-hexanediol, 2,4 -Preferred examples include those selected from hexylene glycol, 1,2-octanediol and dipropylene glycol, isoprene glycol, 1,2-pentanediol, 1,2-hexanediol, 2,4-hexylene glycol, 1,2-octanediol and dipropylene glycol Those selected from Lumpur can be exemplified more preferably. Such an antibacterial polyhydric alcohol can contain only one species or a combination of two or more species. The preferable content of the antibacterial polyhydric alcohol in the pack cosmetic of the present invention is 2 to 10% by mass based on the total amount of the pack cosmetic. The pack cosmetic of the present invention preferably contains phenoxyethanol as a preservative. The preferable content of such phenoxyethanol is 0.1 to 1% by mass. In addition, a form containing no preservative other than phenoxyethanol such as methylparaben, ethylparaben, propylparaben, butylparaben, hibitengluconate, benzalkonium chloride and the like is also preferable. Thus, by providing antiseptic power with a combination of antibacterial polyhydric alcohol and phenoxyethanol, it can be administered even to skin with a reduced skin barrier function with a low risk. The pack cosmetic of the present invention can be produced by treating such essential components and optional components according to a conventional method.

  Hereinafter, the present invention will be described in more detail with reference to examples, but it is needless to say that the present invention is not limited to such examples.

<Examples 1-4>
The pack cosmetic of the present invention was prepared according to the following formulation. That is, A, B, and C were heated to 80 ° C., and B was added to A. After that, C was gradually added to the mixture while stirring and cooled to obtain a pack cosmetic. As a comparative example, a polyvinyl acetate emulsion (solid content 25% by weight), which is a conventional film forming agent, was used. About these pack cosmetics, the peel-off characteristic on humidity 80% and the constant temperature and humidity conditions of 40 degreeC was investigated. Each pack cosmetic is premixed with 0.1% by weight of a 0.1% by weight fluorescein aqueous solution, and a 3cm × 3cm applicator frame is applied to the 3cm × 3cm part on the cheek. The cosmetic 0.1 ml was uniformly applied and peeled after 10 minutes. After peeling, the panel administration site is irradiated with ultraviolet rays in the dark room, the fluorescent state is captured in the image, the area of the fluorescent part is measured, divided by the area of 9 cm ² , and multiplied by 100 The residual rate (%) was determined. The n number was 8. The results are shown in Table 1 as the average residual rate. From this, it can be seen that the pack cosmetic of the present invention is excellent in peel-off properties from the skin.
Titanium dioxide 15 parts by weight β-cyclodextrin 2 parts by weight POE (20) glyceryl isostearate 1 part by weight Polymer emulsion described in Table 1 12 parts by weight water 30 parts by weight 1,3-butanediol 3 parts by weight methylparaben 2 parts by weight phenoxyethanol 0.3 parts by weight ethanol 2.5 parts by weight xanthan gum 0.2 parts by weight water 26 parts by weight Husqualane 3 parts by weight sorbitan sesquistearate 2.8 parts by weight POE (20) sorbitan sesquistearate 1 part by weight

  The present invention can be applied to peel-off pack cosmetics having excellent usability.

Claims (9)

A pack cosmetic comprising the polyurethane represented by the following general formula (1).

General formula (1)
(In the formula, m and l each independently represents an integer of 2 to 10, R 1 and R 2 each independently represents an alkylene group having 1 to 4 carbon atoms, and R 3 represents an alkyl group having 1 to 4 carbon atoms. R4 represents a meaning that no substituent exists, or represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms having an anion portion, A represents a phenylene group, and n and p each independently represent 10 to 1000. In addition, the notation of N + (N) means that either a cationic nitrogen atom or a nitrogen atom having no ion dissociation property is acceptable.) The pack cosmetic according to claim 1, wherein the polyurethane represented by the general formula (1) is represented by the following general formula (2).

General formula (2)
(In the formula, m and l each independently represents an integer of 2 to 10, R 1 and R 2 each independently represents an alkylene group having 1 to 4 carbon atoms, and R 3 represents an alkyl group having 1 to 4 carbon atoms. A represents a phenylene group, and n and p each independently represent a number of 10 to 1000. The notation of N + (N) may be a cationic nitrogen atom or a nitrogen atom having no ion dissociation properties. Means.) The pack cosmetic according to claim 1 or 2, wherein the polyurethane represented by the general formula (1) or the general formula (2) is represented by the following chemical formula 1.

Compound 1 The pack cosmetic according to any one of claims 1 to 3, wherein the content of the polyurethane represented by the general formula (1) or the general formula (2) is 1 to 10% by mass. . The pack cosmetic according to any one of claims 1 to 4, wherein the pack cosmetic is administered to the skin. The pack cosmetic according to claim 5, wherein the purpose of administration is moisturizing or improving the skin barrier function. The pack cosmetic according to any one of claims 1 to 6, further comprising an antibacterial polyhydric alcohol. The antibacterial polyhydric alcohol is selected from isoprene glycol, 1,2-pentanediol, 1,2-hexanediol, 2,4-hexylene glycol, 1,2-octanediol and dipropylene glycol. The pack cosmetic according to claim 7, wherein: The pack cosmetic according to any one of claims 1 to 8, further comprising phenoxyethanol.