Aerosol-type hair cleanser

Abstract

To provide an aerosol type hair cleanser having excellent storage stability under a low temperature environment and excellent foam quality immediately after discharge, good refoaming properties during hair washing, good foam slippage and hair texture after washing.SOLUTION: There is provided an aerosol type hair cleanser which comprises a hair cleanser stock solution containing a surfactant (A) including an anionic surfactant (A1) and two or more nonionic polymers having different weight average molecular weights and a propellant (C) containing carbon dioxide.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an aerosol-type hair cleaning agent.

Background Art

[0002] Aerosol-type cosmetics can be used by discharging the cosmetic, which is a hair cleaning agent stock solution, in a foamy state, and thus have the advantage of being easily spread on the skin or hair. In aerosol-type cosmetics, it is also required that the foam quality (foaming property) immediately after discharge is good and the storage stability is good.

[0003] It is also known to use carbon dioxide gas as a propellant for aerosol-type cosmetics. An aerosol-type cosmetic using carbon dioxide gas as a propellant can discharge creamy and elastic-textured foam, and the foam persists for a long time without disappearing immediately. Furthermore, by confining carbon dioxide gas in the discharged foam, when applied to the skin or hair, the effect that carbon dioxide gas acts as a beauty care component such as anti-aging care can be expected.

[0004] As an aerosol-type cosmetic using carbon dioxide gas as a propellant, for example, Patent Document 1 discloses a foaming coating composition comprising an aqueous stock solution containing a highly polymerized polyethylene glycol, a polyhydric alcohol, an ionic surfactant and water, and a propellant containing carbon dioxide gas, which is excellent in the stability of the content without precipitation of the ionic surfactant, and excellent in the foaming property, extensibility and adhesion to the skin of the discharged product. Further, it is described that the above foaming coating composition is used as a product to be applied to hair such as hair treatment, pack, shampoo, etc.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When a high-molecular polymer such as high-polymer polyethylene glycol is blended in an aerosol composition, either or both of the foam quality immediately after discharge and the storage stability tend to deteriorate. In particular, there is room for improvement in the storage stability of the composition under low-temperature environments. When the aerosol cosmetic is a hair cleanser, in addition to the good foam quality immediately after discharge and the storage stability, the foaming during hair washing (hereinafter referred to as "re-foaming property"), the ease of washing due to the good slipperiness of the foam, and the good feel of the hair after washing are also required. However, in Patent Document 1, these effects have not been studied and there is room for improvement. An object of the present invention is to provide an aerosol-type hair cleanser that is excellent in storage stability under low-temperature environments and foam quality immediately after discharge, and also has good re-foaming property, foam slipperiness, and hair feel after washing during hair washing.

Means for Solving the Problems

[0007] The present inventor has found that an aerosol-type hair cleanser containing a surfactant containing an anionic surfactant and a hair cleanser stock solution containing two or more nonionic polymers having different weight average molecular weights, and a propellant containing carbon dioxide can solve the above problems. That is, the present invention relates to an aerosol-type hair cleanser containing a surfactant (A) containing an anionic surfactant (A1), a hair cleanser stock solution containing two or more nonionic polymers (B) having different weight average molecular weights, and a propellant (C) containing carbon dioxide.

Effects of the Invention

[0008] According to the present invention, it is possible to provide an aerosol-type hair cleanser that is excellent in storage stability under low-temperature environments and foam quality immediately after discharge, and also has good re-foaming property, foam slipperiness, and hair feel after washing during hair washing.

Modes for Carrying Out the Invention

[0009] [Aerosol-type hair shampoo] The aerosol-type hair shampoo of the present invention (hereinafter, also simply referred to as "the hair shampoo of the present invention") contains a surfactant (A) containing an anionic surfactant (A1), and two or more nonionic polymers (B) having different weight average molecular weights, and a propellant (C) containing carbon dioxide, in a hair shampoo stock solution. In the present invention, "containing component X" or "containing component X" also means "formulated with component X". In the present invention, the storage stability at a temperature of 5°C or lower is used as an index for "storage stability under low-temperature environment". Hereinafter, "storage stability under low-temperature environment" is simply referred to as "low-temperature stability".

[0010] Although the reason why the hair shampoo of the present invention exhibits the effects of the present invention due to the above configuration is not clear, it is presumed as follows. The hair shampoo stock solution, which is an aerosol stock solution used in the aerosol-type hair shampoo of the present invention, contains a surfactant (A) containing an anionic surfactant (A1), and two or more nonionic polymers (B) having different weight average molecular weights, and contains carbon dioxide as a propellant (C). The surfactant as component (A) is used to impart foam dischargeability by the aerosol and desired performance as a hair shampoo. By containing the anionic surfactant (A1) in the surfactant (A), detergency can be imparted. When the nonionic polymer as component (B) is blended into the hair shampoo stock solution, the gas of the propellant (C) can be confined in the discharged foam, so that the foam quality becomes good. By using carbon dioxide as the propellant, it is considered that fine and dense foam can be discharged, and the foam quality immediately after discharge and the re-foaming property during hair washing become good.

[0011] However, according to the study by the present inventor, it has been found that the effects obtained differ depending on the molecular weight of the nonionic polymer. More specifically, for example, when a nonionic polymer having a relatively high weight average molecular weight (e.g., 1 million or more) is used, the effect of confining the gas of the propellant (C) in the ejected foam is high, and the slipperiness of the foam during hair washing becomes good. On the other hand, it has been found that any one of the foam quality immediately after ejection, the storage stability at low temperature, and the feel of the hair after washing tends to decrease. In contrast, when a nonionic polymer having a relatively low weight average molecular weight (e.g., 200,000 or less) is used, the storage stability at low temperature and the feel of the hair after washing are good, but the slipperiness of the foam during hair washing tends to be inferior. Therefore, in the hair cleaning agent of the present invention, in the hair cleaning agent stock solution, two or more nonionic polymers having different weight average molecular weights are used as the component (B), and a propellant containing carbon dioxide is used as the component (C), so that it is considered that a hair cleaning agent having all of the storage stability in a low temperature environment, the foam quality immediately after ejection, the re-foaming property during hair washing, the slipperiness of the foam, and the feel of the hair after washing can be obtained.

[0012] <Component (A): Surfactant> The hair cleaning agent stock solution constituting the hair cleaning agent of the present invention contains a surfactant as the component (A). The component (A) is used to impart the foam ejection property by aerosol and the desired performance as a hair cleaning agent. From the viewpoint of imparting detergency, the hair cleaning agent stock solution in the present invention contains an anionic surfactant (A1) as the component (A).

[0013] (Anionic surfactant (A1)) Examples of the anionic surfactant (A1) include alkylbenzene sulfonates, alkyl or alkenyl ether sulfates, alkyl or alkenyl sulfates, alkyl sulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfo fatty acid salts, N-acyl amino acid salts, phosphoric acid mono- or diester salts, sulfosuccinic acid ester salts, etc. One or two or more of these can be used. The hydrocarbon group such as an alkyl group or an alkenyl group, or the constituent fatty acid of the anionic surfactant preferably has 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and still more preferably 10 to 18 carbon atoms. Examples of the counter ion of the anionic group of the anionic surfactant include alkali metal ions such as sodium ion and potassium ion; alkaline earth metal ions such as calcium ion and magnesium ion; ammonium ion; and alkanolammonium having 1 to 3 alkanol groups having 2 or 3 carbon atoms (for example, monoethanolammonium, diethanolammonium, triethanolammonium, triisopropanolammonium, etc.).

[0014] Among the above, as the anionic surfactant, from the viewpoint of use in a hair cleaning agent, one or more selected from the group consisting of alkyl sulfates, alkyl ether sulfates, alkyl ether carboxylates, and N-acyl amino acid salts are preferable. Examples of the alkyl sulfate include sodium lauryl sulfate. Examples of the alkyl ether sulfate include polyoxyethylene alkyl ether sulfates such as sodium laureth sulfate and ammonium laureth sulfate. Examples of the alkyl ether carboxylate include polyoxyethylene alkyl ether acetates such as sodium laureth acetate. Examples of the N-acyl amino acid salt include N-acyl glutamate salts such as sodium cocoyl glutamate. The anionic surfactant (A1) is more preferably one or more selected from the group consisting of alkyl ether sulfates and N-acyl amino acid salts, and still more preferably one or more selected from the group consisting of sodium laureth sulfate, ammonium laureth sulfate, and sodium cocoyl glutamate.

[0015] From the viewpoint of imparting detergency, the content of the anionic surfactant (A1) in the component (A) is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, and even more preferably 90% by mass or more, and may be 100% by mass.

[0016] In addition, from the viewpoints of imparting detergency, storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of foam, and improving the feel of hair after washing, the hair cleansing agent stock solution preferably contains polyoxyethylene alkyl ether sulfate as the component (A1). From the viewpoints of imparting detergency, storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of foam, and improving the feel of hair after washing, the content of polyoxyethylene alkyl ether sulfate in the hair cleansing agent stock solution is preferably 5% by mass or more, more preferably 6% by mass or more, still more preferably 8% by mass or more, and from the viewpoint of improving storage stability, it is preferably 30% by mass or less, more preferably 20% by mass or less, still more preferably 15% by mass or less. The specific range of the content of polyoxyethylene alkyl ether sulfate in the hair cleansing agent stock solution is preferably 5 to 30% by mass, more preferably 6 to 20% by mass, still more preferably 8 to 15% by mass. Also, from the viewpoints of imparting detergency, storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of foam, and improving the feel of hair after washing, the content of polyoxyethylene alkyl ether sulfate in the component (A1) is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, even more preferably 85% by mass or more, even more preferably 90% by mass or more, and may be 100% by mass.

[0017] In order to further impart desired performance, the component (A) can contain, in addition to the anionic surfactant (A1), one or more surfactants selected from the group consisting of cationic surfactants, nonionic surfactants, and amphoteric surfactants.

[0018] (Nonionic surfactant) Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene fatty acid esters, alkyl glucosides, alkyl alkanolamides, alkyl glyceryl ethers, higher fatty acid sucrose esters, polyglycerin fatty acid esters, polyoxyalkylene hydrogenated castor oil, alkyl saccharides, etc. One or more of these can be used. Among the nonionic surfactants exemplified above, the average number of moles of ethylene oxide added (hereinafter referred to as "average number of moles of ethylene oxide added", or "EO average addition moles") in polyoxyethylene alkyl ethers, polyoxyethylene alkenyl ethers, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, and polyoxyethylene hydrogenated castor oil is preferably 2 or more, more preferably 3 or more, still more preferably 5 or more, even more preferably 6 or more, and even more preferably 8 or more, and is preferably 150 or less, more preferably 80 or less, still more preferably 60 or less, and even more preferably 40 or less. And the above EO average addition moles are preferably 2 or more and 150 or less, more preferably 3 or more and 80 or less, still more preferably 5 or more and 60 or less, even more preferably 6 or more and 40 or less, and even more preferably 8 or more and 40 or less. The EO average addition moles are number average values. Also, the alkyl groups in polyoxyalkylene alkyl ethers, alkyl glucosides, alkyl alkanolamides, alkyl glyceryl ethers, and alkyl saccharides, the alkenyl groups in polyoxyalkylene alkenyl ethers, and the fatty acids in polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene fatty acid esters, higher fatty acid sucrose esters, and polyglycerin fatty acid esters are preferably 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and still more preferably 10 to 18 carbon atoms.

[0019] Among these, as the nonionic surfactant, from the viewpoint of using it in a hair cleaning agent, it is preferably at least one selected from the group consisting of polyoxyalkylene alkyl ether, polyoxyalkylene alkenyl ether, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene fatty acid ester, alkyl glucoside, alkyl alkanolamide, alkyl glyceryl ether, and polyoxyalkylene hydrogenated castor oil, and more preferably at least one selected from the group consisting of polyoxyalkylene alkyl ether, alkyl glucoside, alkyl alkanolamide, alkyl glyceryl ether, and polyoxyalkylene hydrogenated castor oil.

[0020] (Cationic surfactant) Examples of the cationic surfactant include (i) alkyltrimethylammonium salts, (ii) alkoxyalkyltrimethylammonium salts, (iii) dialkyldimethylammonium salts, (iv) alkylamidealkyltrimethylammonium salts, (v) alkyldimethylamines and their salts, (vi) alkoxyalkyldimethylamines and their salts, and (vii) alkylamidealkyldimethylamines and their salts, etc. One or more of these can be used. The above cationic surfactant preferably has a long-chain alkyl group having 8 or more and 22 or less carbon atoms, more preferably 8 or more and 18 or less carbon atoms, and still more preferably 12 or more and 18 or less carbon atoms. Examples of the salts of the amines of (v) to (vii) include salts with organic acids or inorganic acids. Examples of the organic acids include aliphatic monocarboxylic acids such as acetic acid and propionic acid; aliphatic dicarboxylic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, maleic acid, and fumaric acid; aromatic dicarboxylic acids such as phthalic acid and isophthalic acid; polycarboxylic acids such as polyglutamic acid; hydroxycarboxylic acids such as glycolic acid, lactic acid, hydroxyacrylic acid, glyceric acid, malic acid, tartaric acid, and citric acid; acidic amino acids such as glutamic acid and aspartic acid, etc. Examples of the inorganic acids include hydrochloric acid, sulfuric acid, phosphoric acid, etc.

[0021] (Amphoteric surfactant) Examples of amphoteric surfactants include betaine-type surfactants, amine oxide-type surfactants, amino acid-type surfactants, etc., and one or more of these can be used. Examples of betaine-type surfactants include carboxybetaine types such as alkyldimethylaminoacetic acid betaine and fatty acid amidopropyl betaine; sulfobetaine types such as alkylsulfobetaine and alkylhydroxysulfobetaine; imidazoline-based betaine types; phosphobetaine types, etc. The hydrocarbon group such as an alkyl group or alkenyl group, or the constituent fatty acid of the above amphoteric surfactant preferably has 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and still more preferably 12 to 18 carbon atoms.

[0022] From the viewpoints of the foam discharge property by aerosol and imparting the desired performance as a hair cleanser, the content of component (A) in the hair cleanser stock solution is preferably 5% by mass or more, more preferably 6% by mass or more, and still more preferably 8% by mass or more. From the viewpoint of improving storage stability, it is preferably 30% by mass or less, more preferably 20% by mass or less, and still more preferably 15% by mass or less. The specific range of the content of component (A) in the hair cleanser stock solution is preferably 5 to 30% by mass, more preferably 6 to 20% by mass, and still more preferably 8 to 15% by mass.

[0023] <Component (B): Nonionic polymer> The hair cleanser stock solution constituting the hair cleanser of the present invention contains, as component (B), two or more nonionic polymers having different weight average molecular weights. By the hair cleanser stock solution containing component (B), in combination with the effect of the propellant which is component (C), the storage stability under low-temperature environments, the foam quality immediately after discharge, the re-foaming property during hair washing, the slipperiness of the foam, and the feel of the hair after washing can be improved. The nonionic polymer used as component (B) is preferably a water-soluble polymer from the viewpoint of solubility in the hair cleanser stock solution.

[0024] The nonionic polymers used as component (B) may be two or more kinds, as long as their weight average molecular weights are different from each other. From the viewpoints of storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of foam, and the feel of hair after washing, the difference in weight average molecular weight between the nonionic polymer having the highest weight average molecular weight and the nonionic polymer having the lowest weight average molecular weight in component (B) is preferably 300,000 or more, more preferably 500,000 or more, still more preferably 800,000 or more, even more preferably 1,000,000 or more, even more preferably 1,500,000 or more. From the viewpoint of availability of nonionic polymers, it is preferably 4,000,000 or less, more preferably 3,000,000 or less, still more preferably 2,000,000 or less. The specific range of the difference in weight average molecular weight between the nonionic polymer having the highest weight average molecular weight and the nonionic polymer having the lowest weight average molecular weight in component (B) is preferably 300,000 to 4,000,000, more preferably 500,000 to 4,000,000, still more preferably 800,000 to 3,000,000, even more preferably 1,000,000 to 3,000,000, even more preferably 1,500,000 to 3,000,000, even more preferably 1,500,000 to 2,000,000. The weight average molecular weight of component (B) can be measured, for example, by gel permeation chromatography (GPC) under the following conditions. Mobile phase: 50 mM LiBr, 1% CH3COOH / ethanol: water = 3:7 (w / w) Column: TSK gel α-M (manufactured by Tosoh Corporation) (two columns in series) Standard substance: polyethylene glycol

[0025] Examples of the nonionic polymers used as component (B) include water-soluble polysaccharides such as starch, cellulose, guar gum, tara gum, locust bean gum, and glucomannan; hydroxyalkylated water-soluble polysaccharides such as hydroxyethyl cellulose and hydroxypropyl cellulose; polyalkylene glycols such as polyethylene glycol and polyethylene glycol-polypropylene glycol copolymers; and polyvinyl alcohol. One or more of these can be used. Among these, from the viewpoints of improving storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of foam, and the feel of hair after washing, as the nonionic polymer, it is preferably at least one selected from the group consisting of water-soluble polysaccharides, hydroxyalkylated water-soluble polysaccharides, and polyalkylene glycols, more preferably at least one selected from the group consisting of starch, cellulose, guar gum, tara gum, locust bean gum, glucomannan, hydroxyethyl cellulose, hydroxypropyl cellulose, polyethylene glycol, and polyethylene glycol-polypropylene glycol copolymer, and still more preferably at least one selected from the group consisting of hydroxyethyl cellulose, hydroxypropyl cellulose, polyethylene glycol, and polyethylene glycol-polypropylene glycol copolymer. From the viewpoints of improving storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of foam, and the feel of hair after washing, component (B) more preferably contains at least one selected from the group consisting of polyethylene glycol and polyethylene glycol-polypropylene glycol copolymer, and still more preferably is polyethylene glycol and polyethylene glycol-polypropylene glycol copolymer.

[0026] More specifically, from the viewpoints of improving storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of foam, and the feel of hair after washing, component (B) preferably contains a nonionic polymer (B1) having a weight average molecular weight of 1,000,000 or more and a nonionic polymer (B2) having a weight average molecular weight of 200,000 or less.

[0027] The weight-average molecular weight of component (B1) is 1,000,000 or more, preferably 1,200,000 or more, more preferably 1,500,000 or more, from the viewpoint of improving the re-foaming property and the slipperiness of the foam during hair washing. Also, from the viewpoints of improving the foam quality immediately after discharge, the storage stability under a low-temperature environment, and the feel of the hair after washing, and from the viewpoint of solubility in the hair washing agent stock solution, it is preferably 5,000,000 or less, more preferably 4,000,000 or less, still more preferably 3,500,000 or less. The specific range of the weight-average molecular weight of component (B1) is 1,000,000 or more, preferably 1,000,000 to 5,000,000, more preferably 1,000,000 to 4,000,000, still more preferably 1,200,000 to 4,000,000, and even more preferably 1,500,000 to 3,500,000. As component (B1), two or more nonionic polymers having a weight-average molecular weight of 1,000,000 or more can also be used. When two or more types of component (B1) are used, it is only necessary that the weight-average molecular weight of each of the nonionic polymers used is 1,000,000 or more. Also, when two or more types of component (B1) are used, these may be the same type of polymer or different types of polymers.

[0028] The weight-average molecular weight of component (B2) is 200,000 or less, preferably 150,000 or less, more preferably 120,000 or less, from the viewpoints of improving the foam quality immediately after discharge, the storage stability under a low-temperature environment, and the feel of the hair after washing. Also, from the viewpoint of improving the re-foaming property and the slipperiness of the foam during hair washing, it is preferably 10,000 or more, more preferably 30,000 or more, still more preferably 50,000 or more. The specific range of the weight-average molecular weight of component (B2) is 200,000 or less, preferably 10,000 to 200,000, more preferably 30,000 to 150,000, still more preferably 50,000 to 120,000. As component (B2), two or more nonionic polymers having a weight-average molecular weight of 200,000 or less can also be used. When two or more types of component (B2) are used, it is only necessary that the weight-average molecular weight of each of the nonionic polymers used is 200,000 or less. Also, when two or more types of component (B2) are used, these may be the same type of polymer or different types of polymers.

[0029] Component (B1) and component (B2) may be the same type of polymer or different types of polymers. From the viewpoints of storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of the foam, and the feel of the hair after washing, it is preferable that component (B1) and component (B2) are different types of polymers. From the viewpoints of improving storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of the foam, and the feel of the hair after washing, component (B1) and component (B2) are preferably at least one selected from the group consisting of polyethylene glycol and polyethylene glycol-polypropylene glycol copolymers. It is more preferable that component (B1) is polyethylene glycol and component (B2) is a polyethylene glycol-polypropylene glycol copolymer. In addition, whether the hair cleaning agent stock solution contains two or more kinds of nonionic polymers as component (B), and the weight average molecular weight, type, and content of the polymers can be determined by, for example, fractionating under the above conditions by GPC using the hair cleaning agent stock solution as a sample and performing analysis on each.

[0030] When component (B) contains component (B1) and component (B2), the mass ratio [(B2) / (B1)] of component (B2) to component (B1) in the hair cleaning agent stock solution is preferably 0.2 or more, more preferably 0.5 or more, still more preferably 1.0 or more, even more preferably 2.0 or more, even more preferably 3.0 or more, even more preferably 3.5 or more, and also preferably 30 or less, more preferably 20 or less, still more preferably 15 or less, even more preferably 12 or less, from the viewpoints of improving storage stability under low-temperature environments and the feel of the hair after washing. The specific range of the mass ratio [(B2) / (B1)] of component (B2) to component (B1) in the hair cleaning agent stock solution is preferably 0.2 to 30, more preferably 0.5 to 20, still more preferably 1.0 to 20, even more preferably 1.0 to 15, even more preferably 2.0 to 15, even more preferably 3.0 to 15, even more preferably 3.5 to 12.

[0031] The content of component (B) in the hair cleaning agent stock solution is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, from the viewpoints of improving storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair cleaning, slipperiness of the foam, and the feel of the hair after cleaning. Also, from the viewpoints of adjusting the hair cleaning agent stock solution to an appropriate viscosity and improving storage stability, it is preferably 5.0% by mass or less, more preferably 2.0% by mass or less, still more preferably 1.0% by mass or less, and even more preferably 0.5% by mass or less. The specific range of the content of component (B) in the hair cleaning agent stock solution is preferably 0.01 to 5.0% by mass, more preferably 0.05 to 2.0% by mass, still more preferably 0.05 to 1.0% by mass, and even more preferably 0.1 to 0.5% by mass.

[0032] The mass ratio [(B) / (A)] of component (B) to component (A) in the hair cleaning agent stock solution is preferably 0.005 or more, more preferably 0.008 or more, still more preferably 0.01 or more, from the viewpoints of improving storage stability under low-temperature environments, foam quality immediately after discharge, re-foaming property during hair cleaning, slipperiness of the foam, and the feel of the hair after cleaning. Also, from the viewpoints of adjusting the hair cleaning agent stock solution to an appropriate viscosity and improving storage stability, it is preferably 0.1 or less, more preferably 0.05 or less, still more preferably 0.03 or less, and even more preferably 0.015 or less. The specific range of the mass ratio [(B) / (A)] of component (B) to component (A) in the hair cleaning agent stock solution is preferably 0.005 to 0.1, more preferably 0.008 to 0.05, still more preferably 0.008 to 0.03, and even more preferably 0.01 to 0.015.

[0033] From the viewpoints of improving the storage stability under low-temperature environments, the foam quality immediately after discharge, the re-foaming property during hair washing, the slipperiness of the foam, and the feel of the hair after washing, the total content of component (A) and component (B) in the hair cleansing agent stock solution is preferably 5.01% by mass or more, more preferably 5.1% by mass or more, still more preferably 5.5% by mass or more, even more preferably 6.0% by mass or more, even more preferably 6.5% by mass or more, and even more preferably 8.5% by mass or more. Also, from the viewpoint of the foam discharge property, it is preferably 40% by mass or less, more preferably 30% by mass or less, still more preferably 20% by mass or less, and even more preferably 18% by mass or less. The specific range of the total content of component (A) and component (B) in the hair cleansing agent stock solution is preferably 5.01 to 40% by mass, more preferably 5.1 to 30% by mass, still more preferably 5.5 to 20% by mass, even more preferably 6.0 to 20% by mass, even more preferably 6.5 to 18% by mass, and even more preferably 8.5 to 18% by mass.

[0034] <aqueous medium> The hair cleansing agent stock solution usually contains an aqueous medium from the viewpoint of dissolving or dispersing component (A), component (B), and other components. Examples of the aqueous medium include water and organic solvents. Examples of the organic solvent include lower alcohols such as ethanol and isopropyl alcohol; and lower molecular weight diols and triols having 6 or less carbon atoms such as 1,3-butylene glycol, glycerin, ethylene glycol, propylene glycol, and dipropylene glycol. Among these, water is preferred as the aqueous medium. From the viewpoints of dissolving or dispersing component (A), component (B), and other components, and improving the foam discharge property and the foam quality immediately after discharge, the content of the aqueous medium in the hair cleansing agent stock solution is preferably 60% by mass or more, more preferably 70% by mass or more, and preferably 98% by mass or less, more preferably 94% by mass or less.

[0035] <other components> The hair cleansing agent stock solution may appropriately contain other components as long as the object of the present invention is not impaired. Examples of such components include polymers other than component (B), organic acids or their salts, antioxidants, oils, anti-dandruff agents, vitamins, bactericides, anti-inflammatory agents, preservatives, chelating agents, moisturizing agents, pearl agents, ceramides, fragrances, ultraviolet absorbers, pH adjusters, etc., which are components usually formulated in hair cleansing agents. Among these, from the viewpoint of imparting desired performance, it is preferable that the hair cleansing agent stock solution further contains an organic acid or its salt, and a fragrance.

[0036] Examples of the organic acid include carboxylic acid compounds and sulfonic acid compounds, and one or more of these can be used. Examples of the carboxylic acid compounds include aliphatic monocarboxylic acids such as acetic acid and propionic acid; aromatic monocarboxylic acids such as benzoic acid; aliphatic dicarboxylic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, maleic acid, and fumaric acid; aromatic dicarboxylic acids such as phthalic acid and isophthalic acid; polycarboxylic acids such as polyglutamic acid; hydroxycarboxylic acids such as glycolic acid, lactic acid, hydroxyacrylic acid, glyceric acid, malic acid, tartaric acid, and citric acid; acidic amino acids such as glutamic acid and aspartic acid, etc. Examples of the sulfonic acid compounds include aliphatic sulfonic acids such as methanesulfonic acid and ethanesulfonic acid; aromatic sulfonic acids such as p-toluenesulfonic acid, etc.

[0037] As the salt in the organic acid salt, from the viewpoints of being used in hair cleansing agents and ease of availability, an alkali metal salt is preferable, one or more selected from the group consisting of sodium salts and potassium salts are more preferable, and a sodium salt is even more preferable.

[0038] Among these, from the viewpoints of improving storage stability under low-temperature environments, the foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of the foam, and the feel of the hair after washing, as the organic acid or its salt, one or more selected from the group consisting of aliphatic dicarboxylic acids, hydroxycarboxylic acids, aromatic sulfonic acids, or their salts are more preferable, and one or more selected from the group consisting of aliphatic dicarboxylic acids, hydroxycarboxylic acids, and aromatic sulfonic acids are more preferable. As the aliphatic dicarboxylic acid, succinic acid is more preferable. As the hydroxycarboxylic acid, one or more selected from the group consisting of lactic acid, malic acid, tartaric acid, and citric acid are more preferable, and malic acid is more preferable. Further, as the aromatic sulfonic acid, p-toluenesulfonic acid is preferable.

[0039] From the viewpoints of improving storage stability under low-temperature environments, the foam quality immediately after discharge, re-foaming property during hair washing, slipperiness of the foam, and the feel of the hair after washing, the content of the organic acid in the hair cleansing agent stock solution is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, still more preferably 0.3% by mass or more. From the viewpoint of solubility in the hair cleansing agent stock solution, it is preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, and even more preferably 5.0% by mass or less. The specific range of the content of the organic acid in the hair cleansing agent stock solution is preferably 0.1 to 20% by mass, more preferably 0.2 to 15% by mass, still more preferably 0.3 to 10% by mass, and even more preferably 0.3 to 5.0% by mass. When using an organic acid salt, it is preferable that the amount of the organic acid salt in the hair cleansing agent stock solution converted to the organic acid is within the above range.

[0040] The method for producing the hair cleansing agent stock solution is not particularly limited, and it can be produced by blending and mixing component (A), component (B), and other components used as necessary by a conventional method.

[0041] <Component (C): Propellant> The propellant (C) constituting the hair cleaning agent of the present invention contains carbon dioxide. By containing carbon dioxide in component (C), fine and dense foam can be discharged, and the re-foaming property during hair cleaning can be enhanced by the above-described action mechanism. From the viewpoint of improving the foam quality immediately after discharge and improving the re-foaming property during hair cleaning, the content of carbon dioxide in the propellant (C) is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, even more preferably 90% by mass or more, and even more preferably 100% by mass. That is, the propellant (C) preferably consists only of carbon dioxide. As a propellant other than carbon dioxide, component (C) may contain nitrogen, propane, normal butane, isobutane, liquefied petroleum gas (LPG) which is a mixture thereof, and other liquefied gases such as dimethyl ether and isopentane, as long as the effects of the present invention are not impaired.

[0042] From the viewpoints of improving the foam quality immediately after discharge, improving the re-foaming property during hair cleaning, and obtaining an appropriate injection rate, when the total amount of the hair cleaning agent stock solution and the propellant (C) is 100% by mass, the filling amount of the propellant (C) in the aerosol-type hair cleaning agent of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, preferably 5% by mass or less, and more preferably 3% by mass or less. The specific range of the filling amount of the propellant (C) when the total amount of the hair cleaning agent stock solution and the propellant (C) is 100% by mass is preferably 0.5 to 5% by mass, and more preferably 1 to 3% by mass. In addition, in order to obtain an appropriate injection rate, the internal pressure of the aerosol container after filling the propellant (C) is preferably 0.1 MPa or more, more preferably 0.3 MPa or more, preferably 1.3 MPa or less, and more preferably 1.0 MPa or less at 25°C. The specific range of the internal pressure of the aerosol container after filling the propellant (C) is preferably 0.1 to 1.3 MPa, and more preferably 0.3 to 1.0 MPa.

[0043] <Aerosol container> The aerosol-type hair cleaning agent of the present invention is filled in an aerosol container for use. Examples of the aerosol container include known pressure-resistant containers made of metal, plastic, etc., and double-structured containers in which an inner bag is housed inside a pressure-resistant container. In the double-structured container, it is preferable to fill the inner bag with the hair cleaning agent stock solution and fill the propellant (C) between the pressure-resistant container and the inner bag.

[0044] The method for preparing the aerosol-type hair cleaning agent of the present invention is not particularly limited. For example, it can be prepared by filling the pressure-resistant container constituting the aerosol container with the hair cleaning agent stock solution, attaching a valve, and then filling the propellant (C) from the valve portion.

[0045] <Method of using the aerosol-type hair cleaning agent> The method of using the aerosol-type hair cleaning agent of the present invention is not particularly limited as long as it has a step of discharging the hair cleaning agent from the aerosol container in a foamy state and applying it to the hair for washing. For example, a method including a step of applying the hair cleaning agent discharged in a foamy state to the hair and washing the hair can be mentioned. The step of washing the hair also includes an operation of foaming the hair cleaning agent on the hair and an operation of rinsing off the hair cleaning agent thereafter.

[0046] Regarding the above-described embodiments, the present invention further discloses the following embodiments. <1> An aerosol-type hair cleaning agent containing a surfactant (A) containing an anionic surfactant (A1) and two or more nonionic polymers (B) having different weight average molecular weights, and a propellant (C) containing carbon dioxide. <2> The aerosol-type hair shampoo according to <1>, wherein the component (A1) is at least one selected from the group consisting of alkylbenzene sulfonates, alkyl or alkenyl ether sulfates, alkyl or alkenyl sulfates, alkyl sulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfo fatty acid salts, N-acyl amino acid salts, phosphoric acid mono- or diester salts, and sulfosuccinic acid ester salts; preferably at least one selected from the group consisting of alkyl sulfates, alkyl ether sulfates, alkyl ether carboxylates, and N-acyl amino acid salts; more preferably at least one selected from the group consisting of alkyl ether sulfates and N-acyl amino acid salts; and still more preferably at least one selected from the group consisting of sodium lauryl sulfate, ammonium lauryl sulfate, and sodium cocoyl glutamate. <3> The aerosol-type hair shampoo according to <2>, wherein the hydrocarbon group such as the alkyl group or alkenyl group possessed by the component (A1), or the constituent fatty acid preferably has 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and still more preferably 10 to 18 carbon atoms. <4> The aerosol-type hair shampoo according to any one of <1> to <3>, wherein the content of the component (A1) in the component (A) is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, and even more preferably 90% by mass or more. <5> The aerosol-type hair shampoo according to any one of <1> to <4>, wherein the hair shampoo stock solution contains 5% by mass or more, preferably 5 to 30% by mass, more preferably 6 to 20% by mass, and still more preferably 8 to 15% by mass of polyoxyethylene alkyl ether sulfate as the component (A1). <6> The aerosol-type hair shampoo according to <5>, wherein the content of polyoxyethylene alkyl ether sulfate in the component (A1) is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, even more preferably 85% by mass or more, and even more preferably 90% by mass or more. <7> The content of component (A) in the above hair cleansing agent stock solution is preferably 5 to 30% by mass, more preferably 6 to 20% by mass, still more preferably 8 to 15% by mass. The aerosol-type hair cleansing agent according to any one of <1> to <6>. <8> The difference in weight-average molecular weight between the nonionic polymer with the highest weight-average molecular weight and the nonionic polymer with the lowest weight-average molecular weight in component (B) is preferably 300,000 to 4,000,000, more preferably 500,000 to 4,000,000, still more preferably 800,000 to 3,000,000, even more preferably 1,000,000 to 3,000,000, even more preferably 1,500,000 to 3,000,000, even more preferably 1,500,000 to 2,000,000. The aerosol-type hair cleansing agent according to any one of <1> to <7>. <9> Component (B) is one or more selected from the group consisting of water-soluble polysaccharides, hydroxyalkylated water-soluble polysaccharides, polyalkylene glycols, and polyvinyl alcohol, preferably one or more selected from the group consisting of water-soluble polysaccharides, hydroxyalkylated water-soluble polysaccharides, and polyalkylene glycols, more preferably one or more selected from the group consisting of starch, cellulose, guar gum, tara gum, locust bean gum, glucomannan, hydroxyethyl cellulose, hydroxypropyl cellulose, polyethylene glycol, and polyethylene glycol-polypropylene glycol copolymer, still more preferably one or more selected from the group consisting of hydroxyethyl cellulose, hydroxypropyl cellulose, polyethylene glycol, and polyethylene glycol-polypropylene glycol copolymer, even more preferably one or more selected from the group consisting of polyethylene glycol and polyethylene glycol-polypropylene glycol copolymer, and even more preferably polyethylene glycol and polyethylene glycol-polypropylene glycol copolymer. The aerosol-type hair cleansing agent according to any one of <1> to <8>. <10> The aerosol-type hair cleaning agent according to any one of <1> to <9>, wherein component (B) contains a nonionic polymer (B1) having a weight average molecular weight of 1,000,000 or more and a nonionic polymer (B2) having a weight average molecular weight of 200,000 or less, and component (B1) and component (B2) are preferably different types of polymers.

[0047] <11> The aerosol-type hair cleaning agent according to <10>, wherein the weight average molecular weight of component (B1) is preferably 1,000,000 to 5,000,000, more preferably 1,000,000 to 4,000,000, still more preferably 1,200,000 to 4,000,000, and even more preferably 1,500,000 to 3,500,000. <12> The aerosol-type hair cleaning agent according to <10> or <11>, wherein the weight average molecular weight of component (B2) is preferably 10,000 to 200,000, more preferably 30,000 to 150,000, and still more preferably 50,000 to 120,000. <13> The aerosol-type hair cleaning agent according to any one of <10> to <12>, wherein component (B1) and component (B2) are one or more selected from the group consisting of polyethylene glycol and polyethylene glycol-polypropylene glycol copolymer. <14> The aerosol-type hair cleaning agent according to <13>, wherein component (B1) is polyethylene glycol. <15> The aerosol-type hair cleaning agent according to <13> or <14>, wherein component (B2) is a polyethylene glycol-polypropylene glycol copolymer. <16> The aerosol-type hair cleaning agent according to any one of <10> to <15>, wherein the mass ratio [(B2) / (B1)] of component (B2) to component (B1) in the hair cleaning agent stock solution is preferably 0.2 to 30, more preferably 0.5 to 20, still more preferably 1.0 to 20, even more preferably 1.0 to 15, even more preferably 2.0 to 15, even more preferably 3.0 to 15, and even more preferably 3.5 to 12. <17> The content of component (B) in the hair cleaning agent stock solution is preferably 0.01 to 5.0% by mass, more preferably 0.05 to 2.0% by mass, still more preferably 0.05 to 1.0% by mass, and even more preferably 0.1 to 0.5% by mass. The aerosol-type hair cleaning agent according to any one of <1> to <16>. <18> The mass ratio [(B) / (A)] of component (B) to component (A) in the hair cleaning agent stock solution is preferably 0.005 to 0.1, more preferably 0.008 to 0.05, still more preferably 0.008 to 0.03, and even more preferably 0.01 to 0.015. The aerosol-type hair cleaning agent according to any one of <1> to <17>. <19> The total content of component (A) and component (B) in the hair cleaning agent stock solution is preferably 5.01 to 40% by mass, more preferably 5.1 to 30% by mass, still more preferably 5.5 to 20% by mass, even more preferably 6.0 to 20% by mass, even more preferably 6.5 to 18% by mass, and even more preferably 8.5 to 18% by mass. The aerosol-type hair cleaning agent according to any one of <1> to <18>. <20> The hair cleaning agent stock solution preferably contains 60% by mass or more, more preferably 70% by mass or more, and preferably 98% by mass or less, more preferably 94% by mass or less of an aqueous medium. The aerosol-type hair cleaning agent according to any one of <1> to <19>.

[0048] <21> The aqueous medium is at least one selected from the group consisting of water, lower alcohols, lower diols and triols having 6 or less carbon atoms, preferably at least one selected from the group consisting of water, ethanol, isopropyl alcohol, 1,3-butylene glycol, glycerin, ethylene glycol, propylene glycol, and dipropylene glycol, and more preferably water. The aerosol-type hair cleaning agent according to any one of <1> to <20>. <22> The hair cleaning agent stock solution further contains an organic acid or its salt, and a fragrance. The aerosol-type hair cleaning agent according to any one of <1> to <21>. <23> The content of the organic acid in the hair cleaning agent stock solution is preferably 0.1 to 20% by mass, more preferably 0.2 to 15% by mass, still more preferably 0.3 to 10% by mass, and even more preferably 0.3 to 5.0% by mass, and is the aerosol type hair cleaning agent described in <22>. <24> The content of carbon dioxide in the propellant (C) is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, even more preferably 90% by mass or more, and even more preferably 100% by mass, and is the aerosol type hair cleaning agent described in any one of <1> to <23>. <25> When the filling amount of the propellant (C) in the aerosol type hair cleaning agent is 100% by mass based on the total amount of the hair cleaning agent stock solution and the propellant (C), it is preferably 0.5 to 5% by mass, more preferably 1 to 3% by mass, and is the aerosol type hair cleaning agent described in any one of <1> to <24>. <26> It contains a hair cleaning agent stock solution containing a surfactant (A) containing an anionic surfactant (A1) and two or more nonionic polymers (B) having different weight average molecular weights, and a propellant (C) containing carbon dioxide. Component (A1) is one or more selected from the group consisting of sodium lauryl sulfate, ammonium lauryl sulfate, and sodium cocoyl glutamate. Component (B) contains a nonionic polymer (B1) having a weight average molecular weight of 1,000,000 or more and a nonionic polymer (B2) having a weight average molecular weight of 200,000 or less. Component (B1) and component (B2) are one or more selected from the group consisting of polyethylene glycol and polyethylene glycol - polypropylene glycol copolymer. The content of component (A) in the hair cleaning agent stock solution is 5 to 30% by mass. The aerosol type hair cleaning agent, wherein the mass ratio [(B) / (A)] of component (B) to component (A) in the hair cleaning agent stock solution is 0.005 to 0.1. <27> A method for using an aerosol-type hair cleaning agent according to any one of <1> to <26>, the method comprising a step of discharging a hair cleaning agent from an aerosol container in a foamed state, applying it to hair, and cleaning the hair.

Example

[0049] Hereinafter, the present invention will be described by way of examples, but the present invention is not limited to the scope of the examples.

[0050] Examples 1 to 8, Comparative Examples 1 to 18 (Production and Evaluation of Aerosol-Type Hair Cleaning Agents) According to the compositions shown in Tables 1 to 3, after blending each component to be blended in the hair cleaning agent stock solution, the mixture was mixed until uniform to prepare a hair cleaning agent stock solution. Next, 50 g of the hair cleaning agent stock solution and the propellants shown in each table were filled into an aerosol container (manufactured by Toyo Seikan Co., Ltd., container type: BL35A115-H, inner coating: epoxy phenol type, outer surface: silver plain (or white)) having a volume of 100 mL so as to have the mass ratio shown in the table, and an aerosol-type hair cleaning agent was prepared. The internal pressure of the aerosol container after filling with the propellant was adjusted to be in the range of 0.65 to 0.85 MPa. The prepared aerosol-type hair cleaning agents were evaluated by the following methods. The results are shown in Tables 1 to 3. Note that the blending amounts described in each table are the effective component amounts (mass %) of each component.

[0051] (Storage Stability at Low Temperatures) Each aerosol-type hair cleaning agent obtained by filling the hair cleaning agent stock solution and the propellant into the aerosol container was allowed to stand in a storage at 5 °C and -5 °C for 28 days, and then the appearance of the contents of the aerosol container was visually observed and evaluated according to the following two-level evaluation criteria. 〔Evaluation Criteria〕 A: Both storage at 5 °C and storage at -5 °C are transparent and uniform. B: Cloudiness, precipitation, separation, or sedimentation is observed in at least one of storage at 5 °C and storage at -5 °C.

[0052] (Foaming (Foam Quality Immediately after Discharge)) For each aerosol-type hair cleansing agent, approximately 0.5 g of the foamy hair cleansing agent was discharged onto the palm from the aerosol container. After thoroughly wetting a hair tress that was 30 cm long, 6 cm wide, and weighed 20 g with warm water at 35 - 40°C, the discharged hair cleansing agent was placed on it, and the state of the foam when it was whipped 10 times was evaluated according to the following three-level evaluation criteria. 〔Evaluation Criteria〕 A: Foam containing fine and uniformly sized bubbles B: Foam with slightly mixed bubbles of different sizes C: Foam with many mixed bubbles of different sizes

[0053] (Slipperiness of the foam) For each aerosol-type hair cleansing agent, approximately 0.5 g of the foamy hair cleansing agent was discharged onto the palm from the aerosol container. After thoroughly wetting a hair tress that was 30 cm long, 6 cm wide, and weighed 20 g with warm water at 35 - 40°C, the discharged hair cleansing agent was placed on it, whipped 10 times, and the slipperiness when passing the hair tress through the fingers was evaluated according to the following three-level evaluation criteria. 〔Evaluation Criteria〕 A: The finger passes through smoothly without feeling resistance from the hair B: The finger passes through smoothly, but slightly feels resistance from the hair C: Feels resistance from the hair and gets caught when passing the finger through

[0054] (Re-foaming property) For each aerosol-type hair cleansing agent, approximately 0.5 g of the foamy hair cleansing agent was discharged onto the palm from the aerosol container. After thoroughly wetting a hair tress that was 30 cm long, 6 cm wide, and weighed 20 g with warm water at 35 - 40°C, the discharged hair cleansing agent was placed on it, whipped 10 times, and then the state of foaming when whipped another 10 times was evaluated according to the following three-level evaluation criteria. 〔Evaluation Criteria〕 A: The foam increases on the hair tress B: No change in the foam on the hair tress C: The foam on the hair tress sags and decreases

[0055] (Smoothness of the hair after washing) For each aerosol-type hair cleansing agent, about 0.5 g of the foamy hair cleansing agent was discharged onto the palm from the aerosol container. After thoroughly wetting a hair tress with a length of 30 cm, a width of 6 cm, and a weight of 20 g with warm water at 35 to 40 °C, the discharged hair cleansing agent was placed on it, and after foaming 20 times, it was rinsed with warm water at 35 to 40 °C for 10 seconds, and the texture of the hair after towel drying was evaluated according to the following three-level evaluation criteria. 〔Evaluation Criteria〕 A: Without feeling roughness or stiffness of the hair, the finger passes through without being caught. B: The finger passes through without being caught by the hair, but a slight roughness and stiffness of the hair are felt. C: Feeling roughness and stiffness of the hair, and being caught when the finger passes through.

[0056]

Table 1

[0057]

Table 2

[0058]

Table 3

[0059] The components used in the table are as follows. <Surfactant (A)> (A1-1) Sodium lauryl sulfate; Sodium polyoxyethylene (2) lauryl ether sulfate, "Emal 227" manufactured by Kao Corporation, active ingredient content 27% by mass (A1-2) Ammonium lauryl sulfate; Ammonium polyoxyethylene (1) alkyl (C10-16) ether sulfate, "Emal 125A" manufactured by Kao Corporation, active ingredient content 25% by mass (A1-3) Sodium cocoyl glutamate; "Amisoft CS-22B" manufactured by Ajinomoto Helsy Supply Co., Ltd., active ingredient content 25% by mass <Polymer> (B1-1) PEG-45M; Polyethylene glycol, weight average molecular weight 2,000,000, "Polyox WSR N-60K" manufactured by The Dow Chemical Company (B1-2) PEG / PPG-2000 / 200 copolymer; Polyethylene glycol - polypropylene glycol copolymer, weight average molecular weight 3,000,000, "Alcox E100" manufactured by Meisei Chemical Industry Co., Ltd. (B1-3) Hydroxyethyl cellulose; Weight average molecular weight 1,500,000, "HEC Daicel SE 850K" manufactured by Daicel Finechem Ltd. (B’) Xanthan gum; Weight average molecular weight 2,000,000, "Echogum" manufactured by DSP Gokyo Foods & Chemicals Co., Ltd. (B2-1) PEG / PPG-2000 / 200 copolymer; Polyethylene glycol - polypropylene glycol copolymer, weight average molecular weight 100,000, "Alcox EP1010N" manufactured by Meisei Chemical Industry Co., Ltd.

[0060] As shown in Table 1, it can be seen that the aerosol-type hair shampoo of this example is excellent in terms of storage stability under low-temperature environments, foam quality immediately after spraying, slipperiness of the foam during washing, re-foaming property, and smoothness of the hair after washing. On the other hand, as shown in Tables 2 and 3, in the aerosol-type hair shampoo of Comparative Example 1 that does not contain carbon dioxide as a propellant, and in the aerosol-type hair shampoos of Comparative Examples 2 to 6 that contain only one nonionic polymer with a weight average molecular weight of 200,000 or less as a polymer, the slipperiness of the foam during washing decreased. Also, in the aerosol-type hair shampoos of Comparative Examples 7 to 17 that contain only one nonionic polymer with a weight average molecular weight of 1,000,000 or more as a polymer, and in the aerosol-type hair shampoo of Comparative Example 18 that contains only one anionic polymer (B’) with a weight average molecular weight of 1,000,000 or more as a polymer, any one of the storage stability under low-temperature environments, foam quality immediately after spraying, slipperiness of the foam during washing, and smoothness of the hair after washing deteriorated.

Industrial Applicability

[0061] According to the present invention, it is possible to provide an aerosol-type hair cleaning agent that is excellent in storage stability under low-temperature environments and the foam quality immediately after discharge, and also has good re-foaming property, foam slipperiness, and the feel of hair after washing.

Claims

1. An aerosol-type hair cleaning agent containing a surfactant (A) containing an anionic surfactant (A1) and two or more nonionic polymers (B) having different weight average molecular weights from each other, and a propellant (C) containing carbon dioxide, wherein the component (B) contains polyethylene glycol (B1) having a weight average molecular weight of 1,000,000 or more and a polyethylene glycol-polypropylene glycol copolymer (B2) having a weight average molecular weight of 200,000 or less, the mass ratio [(B2) / (B1)] of the component (B2) to the component (B1) in the hair cleaning agent stock solution is 0.2 or more and 30 or less. The aerosol-type hair cleaning agent.

2. The aerosol-type hair cleaning agent according to claim 1, wherein the content of the component (A) in the hair cleaning agent stock solution is 5% by mass or more and 30% by mass or less.

3. The aerosol-type hair cleaning agent according to claim 1 or 2, wherein the mass ratio of the component (B) to the component (A) in the hair cleaning agent stock solution is 0.005 or more and 0.1 or less.

4. The aerosol-type hair cleaning agent according to any one of claims 1 to 3, wherein the hair cleaning agent stock solution contains 5% by mass or more of polyoxyethylene alkyl ether sulfate as the component (A1).

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