Cleansing composition

Abstract

To provide a novel cleanser composition that easily dissolves in water and leaves a good moist feel after washing.SOLUTION: A cleanser composition contains water, a higher fatty acid and / or a salt thereof, and a polymer with a structure represented by the formula (1). In the formula (1), R1, R2 and R3 independently represent a hydrogen atom or a C1-4 alkyl group, A is a C2-4 alkylene group, and m and n independently represent 1.0-50, where the polymer has a number average molecular weight of 10,000 or less and an IOB value of 0.4-1.8.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to a detergent composition. [Background technology]

[0002] Cleansing agents used for facial cleansing generally contain high-grade fatty acid soaps due to their cleansing power and foaming properties. Furthermore, in facial cleansing agents in particular, there is ongoing research into combining surfactants, humectants, and other additives to improve not only cleansing power but also user experience and moisturizing properties.

[0003] For example, Patent Document 1 reports a detergent containing (A) one or more selected from higher fatty acid salts, (B) a betaine-based amphoteric surfactant, (C) polyethylene glycol with an average degree of polymerization of 200 to 1540, (D) glyceryl monostearate with an HLB of 4 or less (excluding the component corresponding to (E)), and (E) a self-emulsifying glyceryl monostearate containing a fatty acid salt. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2012-214391 [Overview of the project] [Problems that the invention aims to solve]

[0005] The object of the present invention is to provide a novel detergent composition that is well soluble in water and provides good moisturizing properties after washing. [Means for solving the problem]

[0006] The present invention, which achieves the above objectives, is as follows:

[0007] <Aspect 1> Water and, Higher fatty acids and / or salts thereof, a polymer having the structure represented by the following formula (1) and including [Chemical formula] In the above formula (1), R 1 , R 2 and R 3 are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, A is an alkylene group having 2 to 4 carbon atoms, and m and n are each independently 1.0 to 50, the number average molecular weight of the polymer is 10,000 or less, and the IOB value of the polymer is 0.4 to 1.8, a detergent composition. <Aspect 2> In the above formula (1), A is represented by the following formula (2): [Chemical formula] In the above formula (2), R 4 is an alkyl group having 1 or 2 carbon atoms, the composition according to aspect 1. <Aspect 3> the composition according to aspect 1 or 2, wherein the polymer is a random copolymer. <Aspect 4> the composition according to any one of aspects 1 to 3, further including at least one polyhydric alcohol. <Aspect 5> the composition according to aspect 4, wherein the ratio of the total content of the polyhydric alcohol to the content of the polymer (the polyhydric alcohol: the polymer) is 5:1 to 80:1. <Aspect 6> the composition according to any one of aspects 1 to 5, wherein the content of the component having a polyethylene glycol skeleton is 0.01% by mass or less. <Aspect 7> the composition according to any one of aspects 1 to 6, wherein the higher fatty acid is a fatty acid having 12 to 18 carbon atoms. <Aspect 8> A composition for skin cleansing, as described in any one of embodiments 1 to 7. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a novel detergent composition that is well soluble in water and has good moisturizing properties after washing. [Modes for carrying out the invention]

[0009] The embodiments of the present invention will be described in detail below. However, the present invention is not limited to the embodiments described below, and can be implemented with various modifications within the scope of the essence of the invention.

[0010] Cleansing composition The detergent composition of the present invention (hereinafter also simply referred to as "the composition of the present invention") is Water and, Higher fatty acids and / or salts thereof, A polymer having the structure represented by the following formula (1) and Includes, [ka] In equation (1), R 1 , R 2 and R 3 Each of the following is independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, A is an alkylene group having 2 to 4 carbon atoms, and m and n are independently 1.0 to 50. The number-average molecular weight of the polymer is 10,000 or less, and The IOB value of the polymer is 0.4 to 1.8. Cleansing composition That is the case.

[0011] The composition of the present invention has good water solubility and leaves surfaces feeling moist after washing. Furthermore, because of its good water solubility, the composition of the present invention also has good foaming properties.

[0012] Although not limited to theory, this is presumed to be due to the properties of the polymer of the present invention, namely the unique structure shown in formula (1) above, the number-average molecular weight in a specific range (10,000 or less), and the IOB (Inorganic Organic Balance) value in a specific range (0.4 to 1.8).

[0013] Furthermore, the polymers of the present invention, which have a specific structure, are amphiphilic and tend to dissolve in the aqueous phase, but also possess hydrophobic properties. Therefore, they are considered to have good affinity with higher fatty acids and / or their salts and other components (e.g., humectants and nonionic surfactants) and makeup components contained in the compositions of the present invention, as well as good affinity with the skin.

[0014] Generally, compounds having a polyethylene glycol skeleton are used to improve the water solubility of detergent compositions. In contrast, the polymer of the present invention, in which A in formula (1) is represented by formula (2) below, does not have a polyethylene glycol skeleton, yet compositions of the present invention containing such a polymer exhibit excellent water solubility and moisturizing properties after washing. [ka] (R 4 (This refers to an alkyl group having 1 or 2 carbon atoms.)

[0015] The propylene glycol and butylene glycol used as raw materials for the portion represented by formula (2) above are more readily available from natural sources compared to ethylene glycol, which is used as a raw material for the polyethylene glycol backbone. Therefore, it is preferable that the polymer of the present invention, which does not have a polyethylene glycol backbone, can improve the water solubility of the composition and the moistness after washing.

[0016] <water> The composition of the present invention contains water.

[0017] While there are no particular restrictions on the type of water used, water used in cosmetics, quasi-drugs, etc., can be used, such as purified water, deionized water, or tap water.

[0018] In the composition of the present invention, the water content is not particularly limited and can be appropriately adjusted, for example, depending on the content of components other than water. More specifically, the water content may be, for example, 5.0% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, or 30% by mass or more, relative to the whole composition, or 80% by mass or less, 70% by mass or less, 60% by mass or less, 50% by mass or less, 40% by mass or less, or 35% by mass or less.

[0019] <Higher fatty acids> The composition of the present invention comprises higher fatty acids and / or salts thereof. That is, the composition of the present invention may contain higher fatty acids, may contain higher fatty acid salts, or may contain a mixture of higher fatty acids and higher fatty acid salts.

[0020] Higher fatty acids refer to chain-like monocarboxylic acids with six or more carbon atoms. In the present invention, saturated, unsaturated, linear, or branched fatty acids can be used as higher fatty acids, but fatty acids with 12 to 18 carbon atoms are preferred. More specifically, the higher fatty acids that may be included in the composition of the present invention may include, for example, one or a combination of two or more of lauric acid, myristic acid, palmitic acid, stearic acid, palmitoleic acid, oleic acid, isomyristic acid, isopalmitic acid, and isostearic acid. Among these, from the viewpoint of improving the cleaning effect, it is preferable to use a combination of two or more of lauric acid, myristic acid, palmitic acid, and stearic acid, and it is more preferable to use a combination of these four.

[0021] In the present invention, since the higher fatty acid salt is included for the purpose of constituting a fatty acid soap, the type of higher fatty acid salt is not particularly limited. More specifically, the salt of the higher fatty acid may be, for example, a metal salt such as sodium salt or potassium salt, an ammonium salt, a monoethanolamine salt, a diethanolamine salt, a triethanolamine salt, an alkanolamine such as 2-amino-2-methylpropanol or 2-amino-2-methylpropanediol, or a basic amino acid salt such as lysine or arginine. Of these, potassium salt is preferred from the viewpoint of improving foaming properties.

[0022] In this invention, higher fatty acid salts can be obtained, for example, by neutralizing higher fatty acids with a neutralizing agent when preparing a composition. Generally, the neutralization is not complete, and the product includes unreacted higher fatty acids. In this invention, the neutralization rate of higher fatty acids is not particularly limited, but is preferably 60 to 90 mol%, and more preferably 70 to 85 mol%. Therefore, the detergent according to this invention preferably contains 60 to 90 mol%, more preferably 70 to 85 mol%, of higher fatty acid salts and preferably 10 to 40 mol%, more preferably 15 to 30 mol%, of higher fatty acids. The content of the neutralizing agent is not particularly limited and can be adjusted as appropriate to achieve the above neutralization rate.

[0023] Furthermore, the neutralizing agent used to neutralize higher fatty acids is not particularly limited and is not limited to any neutralizing agent commonly used as an ingredient in higher fatty acid soaps. More specifically, examples of neutralizing agents include hydroxides of alkali metal salts such as potassium hydroxide and sodium hydroxide, hydroxides of alkaline earth metals such as magnesium hydroxide and calcium hydroxide, alkanolamines such as 2-amino-2-methyl-1-propanol, monoethanolamine, diethanolamine, and triethanolamine, basic amino acids such as L-arginine, lysine, and ornithine, aqueous ammonia, ammonium hydroxide, and sodium bicarbonate. Among these, from the viewpoint of improving solubility in water and cleaning effect, one or more selected from sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, aqueous ammonia, monoethanolamine, diethanolamine, and triethanolamine are preferred, one or more selected from sodium hydroxide, potassium hydroxide, aqueous ammonia, monoethanolamine, diethanolamine, and triethanolamine are more preferred, and one or two selected from sodium hydroxide and potassium hydroxide are preferred.

[0024] In the composition of the present invention, the content of the higher fatty acid and / or its salt is not particularly limited. For example, it may be 5.0% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, or 25% by mass or more based on the entire composition, and may also be 60% by mass or less, 55% by mass or less, 50% by mass or less, 45% by mass or less, 40% by mass or less, 35% by mass or less, or 30% by mass or less. In the present invention, the "content of the higher fatty acid and / or its salt" means the "content of the higher fatty acid" when the higher fatty acid is contained alone, the "content of the higher fatty acid salt" when the higher fatty acid salt is contained alone, and the "total of the content of the higher fatty acid and the higher fatty acid salt" when both the higher fatty acid and the higher fatty acid salt are contained. When preparing the composition by separately adding the fatty acid that forms the group of the fatty acid part of the higher fatty acid salt and the neutralizing agent, if reacted in equivalent, the amount of the obtained higher fatty acid salt is calculated as the "content of the higher fatty acid and / or its salt". If there is a remaining amount of the higher fatty acid that forms the group of the fatty acid part of the higher fatty acid salt, the total of the remaining amount and the amount of the obtained higher fatty acid salt is calculated as the "content of the higher fatty acid and / or its salt".

[0025] 〈Polymer of the Present Invention〉 The polymer of the present invention has a structure represented by the following formula (1): [Chemical formula]

[0026] In formula (1), R 1 , R 2 and R 3 are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. In the present invention, examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, and a tert-butyl group. Further, as long as the effects of the present invention are not impaired, these alkyl groups may further have a substituent. The substituent is not particularly limited, and examples thereof include a halogeno group.

[0027] According to one embodiment of the present invention, in equation (1), R 1 , R 2 and R 3 Each of these may independently be a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, or a tert-butyl group.

[0028] According to one embodiment of the present invention, in equation (1), R 1 It is preferable that m is a hydrogen atom, a methyl group, or an ethyl group. Also, if m is 2 or more, that is, multiple R 1 If present, each R 1 These may be the same or different, and in particular, R 1 At least a portion of it is preferably a methyl group. 1 When at least a portion of the group is a methyl group, it is preferable, for example, from the viewpoint of improving the feel of the composition of the present invention.

[0029] According to one embodiment of the present invention, in equation (1), R 1 This can be a state in which hydrogen atoms and alkyl groups having 1 to 4 carbon atoms are mixed. That is, R 1 Some of the atoms may be hydrogen atoms, and the other may be alkyl groups having 1 to 4 carbon atoms. Preferably, R 1 Some of it is a hydrogen atom, and other parts are methyl groups.

[0030] According to one embodiment of the present invention, in equation (1), R 2 It is preferably a hydrogen atom, a methyl group, or an ethyl group, and is more preferably a methyl group.

[0031] According to one embodiment of the present invention, in equation (1), R 2 This can be a state in which hydrogen atoms and alkyl groups having 1 to 4 carbon atoms are mixed. That is, R 2 Some of the atoms may be hydrogen atoms, and the other may be alkyl groups having 1 to 4 carbon atoms. Preferably, R 2Some of it is a hydrogen atom, and other parts are methyl groups.

[0032] According to one embodiment of the present invention, in equation (1), R 3 It is preferably a hydrogen atom, a methyl group, or an ethyl group, and is more preferably a methyl group.

[0033] According to one embodiment of the present invention, in equation (1), R 2 and R 3 At least one of them is preferably a methyl group.

[0034] In formula (1), A is an alkylene group having 2 to 4 carbon atoms. More specifically, A may be, but is not limited to, an ethylene group, a propylene group, a butylene group, an isobutylene group, etc. In particular, A is preferably represented by the following formula (2): [ka]

[0035] In equation (2), R 4 R is an alkyl group having 1 or 2 carbon atoms. More specifically, R 4 This may be a methyl group or an ethyl group.

[0036] In equation (1), m and n represent the average number of moles added to each constituent unit. m and n are independently between 1.0 and 50, and more specifically, they may be 1.0 or greater, 1.5 or greater, 2.0 or greater, 3.0 or greater, 4.0 or greater, 5.0 or greater, 6.0 or greater, 7.0 or greater, 8.0 or greater, 9.0 or greater, or 10 or greater, and may also be 50 or less, 45 or less, 40 or less, 35 or less, 34 or less, 32 or less, 30 or less, 28 or less, 26 or less, 25 or less, 24 or less, 22 or less, 20 or less, 18 or less, 16 or less, 15 or less, 14 or less, 12 or less, 10 or less, or 5.0 or less.

[0037] Furthermore, in formula (1), m is preferably between 1.0 and 14, and more preferably between 2.0 and 5.0. Furthermore, in formula (1), n ​​is preferably between 2.0 and 34, and more preferably between 6.0 and 12.

[0038] According to one embodiment of the present invention, in formula (1), m+n may be 4.0 or more, 4.5 or more, 5.0 or more, 6.0 or more, 7.0 or more, 8.0 or more, 9.0 or more, 10 or more, 11 or more, 12 or more, 13 or more, 14 or more, or 15 or more, and may also be 50 or less, 45 or less, 40 or less, 35 or less, 30 or less, 25 or less, 20 or less, 15 or less, or 12 or less.

[0039] According to one embodiment of the present invention, in equation (1), m:n may be 1:10 to 10:1.

[0040] The polymer of the present invention has a number-average molecular weight of 10,000 or less. More specifically, the number-average molecular weight of the polymer of the present invention may be, for example, 10,000 or less, 5,000 or less, 3,500 or less, 3,000 or less, 2,500 or less, 2,000 or less, 1,500 or less, 1,400 or less, 1,300 or less, 1,200 or less, 1,100 or less, 1,000 or less, 900 or less, 800 or less, 700 or less, or 600 or less, and may also be 130 or more, 150 or more, 200 or more, 250 or more, 300 or more, 350 or more, 400 or more, 450 or more, or 500 or more. Furthermore, the number-average molecular weight of the polymer of the present invention is preferably 300 or more and 3,500 or less, and more preferably 500 or more and 1,200 or less.

[0041] The IOB value of the polymer of the present invention is 0.4 to 1.8. More specifically, the IOB value of the polymer of the present invention may be, for example, 0.4 or more, 0.5 or more, 0.6 or more, or 0.7 or more, and may also be 1.8 or less, 1.6 or less, 1.4 or less, or 1.2 or less. Furthermore, it is preferable that the IOB value of the polymer of the present invention is 0.7 or more and 1.2 or less.

[0042] Here, the IOB value is an abbreviation for Inorganic / Organic Balance, and it is a value that represents the ratio of the inorganic value to the organic value, and serves as an indicator of the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. For each of the "inorganic value" and "organic value," for example, one carbon atom in a molecule has an "organic value" of 20, and one hydroxyl group has an "inorganic value" of 100. The "inorganic value" and "organic value" are set according to various atoms or functional groups, and the IOB value of an organic compound can be calculated by summing the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound (see, for example, Yoshio Koda, "Organic Concept Diagram - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984). For the method of determining the IOB value, refer to the method described in the examples.

[0043] The polymer of the present invention may be a block copolymer or a random copolymer, but a random copolymer is preferred.

[0044] The method for producing the polymer of the present invention is not particularly limited, and may be carried out, for example, by addition polymerization of epoxides corresponding to each constituent unit. The addition polymerization may be block polymerization or random polymerization, but random polymerization is preferred.

[0045] Furthermore, the polymer production method of the present invention may further include reacting the polymer obtained by the above addition polymerization with an alkyl halide. Through the reaction with the alkyl halide, the hydroxyl groups within the molecule of the obtained polymer are sequestered by the alkyl group, and as a result, the hydrophobicity of the entire polymer can be adjusted as desired. In the present invention, the sequestering rate of hydroxyl groups by alkyl groups within the polymer molecule may be, for example, 30% or more, 35% or more, 40% or more, 45% or more, 50% or more, or 55% or more, and may also be 60% or less, 59% or less, 58% or less, 57% or less, 56% or less, or 55% or less. The sequestering rate of hydroxyl groups by alkyl groups can be determined by the method described in the examples.

[0046] One of the features of the polymer of the present invention is that it possesses both high water solubility and high lipid solubility.

[0047] The solubility of the polymer of the present invention in water may be, for example, 10% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more, or 50% by mass or more.

[0048] Furthermore, as an indicator of the lipid solubility of the polymer of the present invention, for example, solubility in olive oil can be used. The solubility of the polymer of the present invention in olive oil may be, for example, 0.01% by mass or more, 0.05% by mass or more, 0.10% by mass or more, 0.50% by mass or more, or 1.00% by mass or more. The upper limit of the solubility of the polymer of the present invention in olive oil is not particularly limited and may be, for example, 10% by mass or less.

[0049] In the composition of the present invention, the content of the polymer of the present invention is not particularly limited and may be, for example, 0.001% by mass or more, 0.005% by mass or more, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, or 4.0% by mass or more, or 10.0% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less.

[0050] <Other ingredients> The composition of the present invention may further contain other components, as long as they do not impair the effects of the present invention. Other components are described below illustratively, but the present invention is not limited to these.

[0051] As mentioned above, compounds having a polyethylene glycol skeleton are generally used to improve the water solubility of detergent compositions. In contrast, the polymer of the present invention, in which A in formula (1) is represented by formula (2), does not have a polyethylene glycol skeleton, yet compositions of the present invention containing such polymer exhibit excellent water solubility and moisturizing properties after washing. The compositions of the present invention may substantially contain no components having a polyethylene glycol skeleton, or if they do, the content may be 0.01% by mass or less, 0.005% by mass or less, or 0.001% by mass or less.

[0052] (Polyhydric alcohol) The composition of the present invention preferably further contains at least one polyhydric alcohol, because polyhydric alcohols can impart moisture after washing. Therefore, polyhydric alcohols can also be referred to as moisturizers, depending on the type.

[0053] A polyhydric alcohol is an alcohol having two or more hydroxyl groups in its molecule. In the present invention, the polyhydric alcohol is not particularly limited and includes, for example, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, dipropylene glycol, glycerin, diglycerin, sorbitan, sorbitol, maltitol, glucose, and sucrose. Of these, from the viewpoint of further improving the effects of the present invention, it is preferable that the polyhydric alcohol includes at least one selected from the group consisting of dipropylene glycol, glycerin, and sorbitol.

[0054] In the composition of the present invention, the content of polyhydric alcohols (or the total content in the case of two or more types of polyhydric alcohols) is not particularly limited. For example, it may be 5.0% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, or 30% by mass or more relative to the whole composition. It may also be 60% by mass or less, 55% by mass or less, 50% by mass or less, 45% by mass or less, 40% by mass or less, 35% by mass or less, or 30% by mass or less.

[0055] Furthermore, if the composition of the present invention contains polyhydric alcohols, the ratio of the total content of polyhydric alcohols to the content of the polymer of the present invention (polyhydric alcohols: polymer of the present invention) is not particularly limited and may be, for example, 5:1 to 80:1, or 5:1 to 70:1, 5:1 to 60:1, or 8:1 to 30:1.

[0056] (Surfactants) The composition of the present invention preferably further contains a surfactant. The surfactant is not particularly limited, but for example, from the viewpoint of improving foam quality and foam retention, a nonionic surfactant is preferred, and from the viewpoint of improving foaming ability, an amphoteric surfactant is preferred. For this reason, the composition of the present invention preferably uses both a nonionic surfactant and an amphoteric surfactant in combination.

[0057] The nonionic surfactant is not particularly limited and includes, for example, polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, and polyoxyethylene stearyl ether; polyoxyethylene polyoxypropylene alkyl ethers such as polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene cetyl ether, polyoxyethylene polyoxypropylene stearyl ether, and polyoxyethylene polyoxypropylene decyltetradecyl ether; polyoxyethylene alkylphenyl ethers such as polyoxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether; sorbitan fatty acid esters such as sorbitan monolaurate, sorbitan monostearate, and sorbitan monooleate; and polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, and polyoxyethylene sorbitan trioleate. Examples include oxyethylene sorbitan fatty acid esters; glycerin fatty acid esters such as glyceryl laurate, glyceryl myristate, glyceryl stearate, glyceryl isostearate, and glyceryl behenate; polyoxyethylene fatty acid glyceryls such as polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl monooleate, polyoxyethylene glyceryl triisostearate, polyoxyethylene (caprylic / capric acid) glyceryl, and polyoxyethylene glyceryl isostearate; polyglycerin fatty acid esters such as diglyceryl monostearate, decaglyceryl monooleate, polyglyceryl caprylate, and polyglyceryl laurate; polyoxyethylene fatty acid esters such as polyethylene glycol monolaurate and polyethylene glycol monostearate; polyoxyethylene castor oil; hydrogenated castor oil; polyoxyethylene hydrogenated castor oil; polyoxyethylene lanolin; and polyoxyethylene reduced lanolin.

[0058] In the composition of the present invention, the content of a nonionic surfactant, if present, is not particularly limited. For example, it may be 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, 2.5% by mass or more, 3.0% by mass or more, 3.5% by mass or more, or 4.0% by mass or more, relative to the whole composition. Alternatively, it may be 10% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, or 2.0% by mass or less.

[0059] The amphoteric surfactants are not particularly limited and include, for example, glycine-type amphoteric surfactants, aminopropionic acid-type amphoteric surfactants, amidopropyl betaine-type amphoteric surfactants, aminoacetic acid betaine-type amphoteric surfactants, and sulfobetaine-type amphoteric surfactants. More specifically, examples of amphoteric surfactants include alkyldiaminoethylglycine hydrochloride, sodium lauryldiaminoethylglycine, lauryl betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolium betaine (also called "sodium cocoamphoacetate"), sodium laurylaminopropionate, laurylaminopropionate triethanolamine, sodium laurylaminodipropionate, coconut oil fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine sodium, coconut oil fatty acid acyl-N-carboxyethoxyethyl-N-carboxyethylethylenedi Examples include disodium amine, coconut oil fatty acid amidopropyl betaine, palm oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, ricinoleic acid amidopropyl betaine, lauryldimethylaminoacetic acid betaine, coconut oil alkyldimethylaminoacetic acid betaine, stearyldimethylaminoacetic acid betaine, stearyl dihydroxyethyl betaine, lauric acid amidopropyl acetate betaine, lauryl hydroxysulfobetaine, lauric acid amidopropyl hydroxysulfobetaine, myristate acid amidopropyl hydroxysulfobetaine, coconut oil fatty acid amidopropyl hydroxysulfobetaine, and the like.

[0060] In the composition of the present invention, the content of an amphoteric surfactant, if present, is not particularly limited. For example, it may be 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, 2.5% by mass or more, 3.0% by mass or more, 3.5% by mass or more, or 4.0% by mass or more relative to the whole composition. Alternatively, it may be 10% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, or 2.0% by mass or less.

[0061] In addition to the components described above, the composition of the present invention may optionally contain other components that can be added to skin cleansing products, as long as they do not impair the effects of the present invention. Examples of such components include buffering agents (e.g., citric acid, sodium citrate, etc.), chelating agents (e.g., EDTA, etc.), dyes, fragrances, etc., but are not limited to these examples.

[0062] Method for producing the composition of the present invention The method for producing the composition of the present invention is not particularly limited and can be carried out, for example, by mixing the essential components described above with other components that may be added as desired. Furthermore, when mixing, means such as heating or stirring may be used as needed.

[0063] Uses of the composition of the present invention The composition of the present invention can be suitably used, for example, as a skin cleanser or a skin moisturizing cleanser. The composition of the present invention can be particularly suitably used as a facial cleanser. Furthermore, because the composition of the present invention has excellent foaming properties, it may be called, for example, a facial foam.

[0064] Furthermore, the product form of the composition of the present invention is not particularly limited and may be, for example, a paste, a foam, an emulsion, or a gel. Here, "paste" means that it exhibits a paste-like (glue-like) state at room temperature (25°C). [Examples]

[0065] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0066] 《Synthesis Examples 1 and 2》 The following synthesis examples 1 and 2 synthesized polymers having the structure represented by formula (3) below: [ka] In formula (3), the terms in brackets [] represent random copolymers.

[0067] <Synthesis Example 1> Synthesis example 1: R 1 =H, R 2 =H, R 3 =CH3, R 4 Polymer 1 of =CH3, m=2.0, and n=6.0 Polymer 1 was obtained by synthesis using the method described below.

[0068] 128 g of methanol and 6.4 g of potassium hydroxide as a catalyst were charged into an autoclave. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 80°C while stirring. Next, a mixture of 592 g of glycidol and 1392 g of propylene oxide was added dropwise using a dropping device at 95°C over 20 hours, followed by stirring for 5 hours. The reaction composition was removed from the autoclave, neutralized with hydrochloric acid to pH 6-7, and treated at 100°C under reduced pressure of -0.095 MPa (50 mmHg) for 1 hour to remove any remaining water. Further filtration was performed to remove any salts formed after treatment, yielding 2000 g of polymer 1 of Synthesis Example 1.

[0069] In the following sections, various physical properties were determined for the obtained polymer 1.

[0070] (number average molecular weight) The number-average molecular weight of the obtained polymer 1 was calculated by gel permeation chromatography (GPC). The system used was a SHODEX® GPC101 GPC system, with a SHODEX RI-71s differential refractometer, a SHODEX KF-G guard column, and three SHODEX KF804L columns mounted in sequence. The column temperature was 40°C, and tetrahydrofuran was flowed at a flow rate of 1 ml / min as the developing solvent. 0.1 ml of a 0.1 wt% tetrahydrofuran solution of the obtained reaction product was injected, and a chromatogram representing refractive index intensity and elution time was obtained using the BORWIN GPC calculation program. The number-average molecular weight was determined from this chromatogram using polyethylene glycol as the standard and was found to be approximately 530.

[0071] (Weight average molecular weight) The weight-average molecular weight of the obtained polymer 1 was determined by GPC calculation in the same manner as described above, and was approximately 859.

[0072] (Polydispersity) Based on the number-average molecular weight and weight-average molecular weight obtained above, the polydispersity Mw / Mn of polymer 1 was 1.62.

[0073] (IOB value) The IOB value of the obtained polymer 1 was determined to be 1.1, as follows.

[0074] More specifically, in polymer 1, the organic value was calculated using a value of 20 for carbon and -10 for iso branching. The inorganic value was calculated using a value of 100 for hydroxyl groups and 20 for ether bonds. • Methanol moiety: (1 carbon atom, 1 hydroxyl group) × 1 Organic content value: 20 Inorganic value: 100 Glycidol moiety: (3 carbon atoms, 1 iso-branched, 1 hydroxyl group, 1 ether bond) × 2 Organic content value: (60-10)×2=100 Inorganic value: (100 + 20) × 2 = 240 • Propylene oxide moiety: (3 carbon atoms, 1 iso-branched, 1 ether bond) × 6 Organic content value: (60-10)×6=300 Inorganic value: 20 × 6 = 120 Based on the above, the total organic value is 420 and the total inorganic value is 460, resulting in an IOB value of 1.09.

[0075] (cloud point) A 5 wt% aqueous solution was prepared from the obtained polymer 1, heated to 85°C, and then cooled. The temperature at which it became a clear solution was 74°C. Therefore, it was found that the cloud point of polymer 1 is 74°C.

[0076] (Hydroxyl value) The hydroxyl value of the obtained polymer 1 was measured according to the measurement method of JIS K-1557-1 and was found to be 294.

[0077] (Solubility in water) The solubility of the obtained polymer 1 in water was determined to be 50% by mass or more, using the same method as described later in the "compatibility evaluation" section.

[0078] (Solubility in olive oil) The solubility of the obtained polymer 1 in olive oil was determined as follows: Polymer 1 was mixed with olive oil to a concentration of 1.0 wt%, and its appearance was checked. A uniform appearance was marked with "○". In this case, the solubility of polymer 1 in olive oil was 1.0 mass%.

[0079] The various physical properties of polymer 1 measured above are shown in Table 1 below.

[0080] <Synthesis Example 2> Synthesis example 2: R 1 =H and CH3, R 2 =H and CH3, R 3 =CH3, R 4 Polymer 2 =CH3, m=2.0, and n=6.0 Polymer 2 was obtained by synthesis using the method described below.

[0081] 128 g of methanol and 6.4 g of potassium hydroxide as a catalyst were charged into an autoclave. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 80°C while stirring. Next, a mixture of 592 g of glycidol and 1392 g of propylene oxide was added dropwise at 95°C for 20 hours using a dropping device, and then stirred for 2 hours. Next, 244 g of potassium hydroxide was charged, the system was replaced with dry nitrogen, and then 200 g of methyl chloride was injected under pressure at a temperature of 80-130°C and reacted for 5 hours. After that, the reaction composition was removed from the autoclave, neutralized with hydrochloric acid to pH 6-7, and treated at a reduced pressure of -0.095 MPa (50 mmHg) at 100°C for 1 hour to remove the contained water. Further filtration was performed to remove the salt formed after treatment, and 1820 g of polymer 2 was obtained. A sample of methyl chloride was taken before the reaction and purified, and the hydroxyl value was 125, so R 2 and R 3 The ratio of methyl groups to hydrogen atoms (CH3 / H) in polymer 2 was found to be 0.57. In other words, the hydroxyl group chelating rate of polymer 2 was 57%.

[0082] Similar to the case of polymer 1 described above, various physical properties were determined for the obtained polymer 2, and the results are shown in Table 1 below.

[0083] [Table 1]

[0084] Examples 1-8, Comparative Examples 1 and 2, and Reference Example 1 A paste-like cleansing composition was prepared using the formulations shown in Table 2 below. Unless otherwise specified, the values ​​in Table 2 represent the amount of each ingredient, and the unit is mass%.

[0085] Furthermore, the usability (water solubility during washing and moisturizing effect after washing) of each obtained composition was comprehensively evaluated by five expert sensory evaluation panel members when they washed their faces with the composition of Comparative Example 1. The evaluation criteria are as follows, and the evaluation results are shown in Table 2.

[0086] <Dissolving in water during washing> ·Reference composition: Comparative example 1 • Evaluation results: "A": Clearly better solubility in water compared to Comparative Example 1; "B": Slightly better solubility in water compared to Comparative Example 1; "C": Approximately the same as Comparative Example 1; "D": Slightly less soluble in water compared to Comparative Example 1; "E": Its solubility in water is clearly worse compared to Comparative Example 1.

[0087] The solubility in water was determined by how easily the composition dissolved when 1 g of the composition sample was mixed with 10 g of water.

[0088] <Moisturizing effect after washing> ·Reference composition: Comparative example 1 • Evaluation results: "A": Compared to Comparative Example 1, the skin feels noticeably more moisturized; "B": Compared to Comparative Example 1, the skin feels slightly more moisturized; "C": Approximately the same as Comparative Example 1; "D": Compared to Comparative Example 1, the skin feels slightly less moisturized; "E": Compared to Comparative Example 1, the skin feels noticeably less moisturized.

[0089] [Table 2]

[0090] As is clear from the results in Table 2, all of the detergent compositions in Examples 1 to 8 were found to be significantly improved compared to Comparative Example 1 in both water solubility and moisturizing effect after washing.

[0091] On the other hand, in the detergent composition of Comparative Example 2, although we tried different types of amphoteric surfactants, no improvement was observed in either water solubility or moisturizing effect after washing compared to Comparative Example 1.

[0092] Furthermore, while the detergent composition of Reference Example 1 is clearly improved compared to Comparative Example 1 in both water solubility and post-wash moisturizing properties, this reference example detergent composition contains a component having a polyethylene glycol skeleton.

[0093] In contrast, the cleaning compositions of Examples 1 to 8 were found to be excellent in both water solubility and moisturizing effect after washing, even though none of them contained any polyethylene glycol-containing components such as polyethylene glycol.

Claims

1. Water and, Higher fatty acids and / or salts thereof, A polymer having the structure represented by the following formula (1) and Includes, 【Chemistry 1】 In the above formula (1), R １ , R ２ and R ３ Each of the following is independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, A is an alkylene group having 2 to 4 carbon atoms, and m and n are independently 1.0 to 50. The number-average molecular weight of the polymer is 10,000 or less, and The IOB value of the polymer is 0.4 to 1.

8. Cleansing composition.

2. In equation (1) above, A is expressed by the following equation (2): 【Chemistry 2】 In the above formula (2), R ４ is an alkyl group having 1 or 2 carbon atoms. The composition according to claim 1.

3. The composition according to claim 1 or 2, wherein the polymer is a random copolymer.

4. The composition according to claim 1 or 2, further comprising at least one polyhydric alcohol.

5. The composition according to claim 4, wherein the ratio of the total content of the polyhydric alcohols to the content of the polymer (polyhydric alcohols:polymer) is 5:1 to 80:

1.

6. The composition according to claim 1 or 2, wherein the content of a component having a polyethylene glycol skeleton is 0.01% by mass or less.

7. The composition according to claim 1 or 2, wherein the higher fatty acid is a fatty acid having 12 to 18 carbon atoms.

8. The composition according to claim 1 or 2, for use in skin cleansing.

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