Multi-layered separated hair cosmetic

Abstract

To provide a multi-layer separation type hair cosmetic which can realize appropriate separation while improving the feel of hair more than ever before. The present invention relates to a multi-layer separated hair cosmetic composition comprising a silicone, a cationic surfactant, an anionic surfactant, and ethanol.

Description

[Technical field]

[0001] The present invention relates to a multi-layer separated hair cosmetic composition which has a separated oil layer and an aqueous layer, and which is used after the oil layer and the aqueous layer are uniformly mixed by shaking. [Background technology]

[0002] As a conventional multi-layered hair cosmetic composition, for example, as shown in Patent Documents 1 and 2, a two-layer separated type composition containing ethanol, silicone, and a cationic surfactant is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-162222 A [Patent Document 2] JP 2014-43399 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present inventors, who have been studying ways to improve the feel of hair after use in the conventional two-layer separation type hair cosmetic compositions described above, have found that the feel of hair can be improved even more than before by adding a cationic surfactant. However, they also noticed that increasing the content of the cationic surfactant makes it difficult for the oil layer and the water layer to separate, and the clean separation of the oil layer and the water layer results in a problem that the appearance of the product is impaired.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a multi-layer separation type hair cosmetic composition which contains a cationic surfactant to improve the feel of hair compared to conventional methods while achieving appropriate separation. [Means for solving the problem]

[0006] That is, the multi-layer separated type hair cosmetic composition according to the present invention is as follows. [1] A multi-layer separation type hair cosmetic composition comprising a silicone, a cationic surfactant, an anionic surfactant, and ethanol. [2] The multi-layer separated hair cosmetic composition according to [1], wherein the ratio (B / A) of the content of the cationic surfactant (A) to the content of the anionic surfactant (B) is 0.05 or more and 8 or less. [3] The multi-layer separated hair cosmetic composition according to [1] or [2], wherein the cationic surfactant is a quaternary cationic surfactant. [4] The multi-layer separated hair cosmetic composition according to any one of [1] to [3], wherein the cationic surfactant is at least one selected from the group consisting of lauryltrimethylammonium salts, cetyltrimethylammonium salts, stearyltrimethylammonium salts, behenyltrimethylammonium salts, dicocoyldimethylammonium salts, distearyldimethylammonium salts, and dialkyl ester ammonium salts. [5] The multi-layer separated hair cosmetic composition according to any one of [1] to [4], wherein the anionic surfactant is at least one selected from the group consisting of alkyl ether phosphate salts, fatty acid salts, alkyl ether sulfates, alkyl sulfate salts, acyl N-methyl taurine salts, alkyl sulfonates, alkyl ether carboxylate salts, α-olefin sulfonates, and N-acyl amino acid salts. [6] The multi-layer separated hair cosmetic composition according to any one of [1] to [5], which comprises an oil layer and an aqueous layer, the content of the oil layer being 50% by mass or more and 75% by mass or less. Effect of the Invention

[0007] According to the present invention, it is possible to provide a multi-layer separation type hair cosmetic composition which contains a cationic surfactant to improve the feel of hair compared to conventional methods while achieving appropriate separation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] An embodiment of the present invention will be described below. The multi-layer separated hair cosmetic composition according to this embodiment is, for example, a hair treatment agent, and is preferably a leave-on type that is not washed off after application to the hair. Therefore, a leave-on type hair treatment agent will be described below as an example.

[0009] The hair treatment agent according to this embodiment has at least two layers, an oil layer and an aqueous layer, which remain separate when left to stand, and which are mixed together by shaking the container when used.

[0010] The hair treatment agent according to this embodiment specifically contains silicone, a cationic surfactant, an anionic surfactant, and ethanol.

[0011] As the silicone, for example, one or more selected from the group consisting of volatile silicone, amino-modified silicone, phenyl-modified silicone, alkyl-modified silicone, dimethicone, dimethiconol, and silicone elastomer can be used. Among these silicones, it is preferable to use one having a number average degree of polymerization of 1000 to 5000, and it is more preferable to use one having a number average degree of polymerization of 1300 to 5000.

[0012] As the silicone, only one of the above-mentioned silicones may be used, or two or more different types or number-average polymerization degrees may be used in combination. It is more preferable to use a low-polymerization silicone having a number-average polymerization degree of less than 1000 in combination with a high-polymerization silicone having a number-average polymerization degree of 1000 or more and 5000 or less.

[0013] The content of silicone in the entire treatment is preferably 10% by mass or more and 60% by mass or less, more preferably 15% by mass or more and 55% by mass or less, and even more preferably 20% by mass or more and 50% by mass or less. When two or more types of silicone are used in combination, this content means the total content. When two or more types of silicone with different number average polymerization degrees are used in combination, the proportion of the high polymerization degree silicone described above is preferably in the range of 2% by mass or more and 20% by mass or less with respect to the entire treatment.

[0014] The mass ratio of the highly polymerized silicone and ethanol contained in the entire treatment agent (ethanol / silicone gum) is preferably from 0.05 to 8, more preferably from 0.1 to 6, and particularly preferably from 0.5 to 4. By setting the mass ratio of the highly polymerized silicone and ethanol contained in the entire treatment agent (ethanol / silicone gum) to from 0.05 to 8, the oil layer and the aqueous layer can be separated more cleanly, which is preferable.

[0015] As the cationic surfactant, for example, a quaternary cationic surfactant is preferably used, and for example, one or more selected from the group consisting of lauryl trimethyl ammonium salt, cetyl trimethyl ammonium salt, stearyl trimethyl ammonium salt, behenyl trimethyl ammonium salt, dicocoyl dimethyl ammonium salt, distearyl dimethyl ammonium salt, and dialkyl ester ammonium salt can be used. More specifically, it is preferable to use one or more selected from the group consisting of lauryltrimonium chloride, cetrimonium chloride, cetrimonium bromide, cetrimonium methosulfate, steartrimonium chloride, steartrimonium bromide, steartrimonium methosulfate, behentrimonium chloride, behentrimonium methosulfate, dicocodimonium chloride, distearyldimonium chloride, and dicocoyl ethyl hydroxyethylmonium methosulfate, and it is particularly preferable to use one or more selected from the group consisting of steartrimonium chloride, cetrimonium chloride, and dicocodimonium chloride.

[0016] The content of the cationic surfactant in the entire hair treatment agent is preferably from 0.01 to 1.0 mass%, more preferably from 0.03 to 0.5 mass%, and even more preferably from 0.05 to 0.3 mass%.

[0017] As the anionic surfactant, for example, alkyl ether phosphate salts, fatty acid salts, alkyl ether sulfate salts, alkyl sulfate salts, acyl N-methyl taurine salts, alkyl sulfonates, alkyl ether carboxylate salts, α-olefin sulfonates, N-acyl amino acids, acyl peptide salts, acyl lactates, etc. can be used. Specifically, the surfactants include sodium dioleth-8 phosphate, sodium laurate, sodium laureth sulfate, sodium cetyl sulfate, sodium cocoyl methyl taurine, sodium methyl taurine, sodium diethylhexyl sulfosuccinate, sodium laureth-6 carboxylate, sodium laureth-11 carboxylate, sodium olefin (C14-C16) sulfonate, sodium cocoyl methyl alanine, sodium cocoyl glutamate, sodium acyl (C12, C14) aspartate, TEA lauroyl methyl alanine, TEA acyl (C12, C14) aspartate, sodium lauroyl hydrolyzed silk, sodium isostearoyl lactate, etc. It is preferable to use one or more selected from the group, and among them, it is preferable to use sodium dioleth-8 phosphate, sodium laurate, sodium laureth sulfate, sodium cetyl sulfate, sodium methyl cocoyl taurate, sodium methyl taurate, sodium diethylhexyl sulfosuccinate, sodium laureth-6 carboxylate, sodium laureth-11 carboxylate, sodium olefin (C14-C16) sulfonate, sodium cocoyl methyl alanine, sodium cocoyl glutamate, sodium acyl (C12, C14) aspartate, TEA lauroyl methyl alanine, and TEA acyl (C12, C14) aspartate.

[0018] The content of the anionic surfactant in the entire hair treatment agent is preferably from 0.01 to 1.0 mass%, more preferably from 0.03 to 0.5 mass%, and even more preferably from 0.04 to 0.4 mass%.

[0019] The mass ratio (B / A) of the cationic surfactant content (A) to the anionic surfactant content (B) in the treatment agent of this embodiment is preferably 0.05 or more and 8 or less, more preferably 0.1 or more and 5 or less, and even more preferably 0.1 or more and 4 or less.

[0020] The content of ethanol in the entire hair treatment agent is preferably no more than 10% by mass, more preferably no more than 8% by mass, and even more preferably no more than 5% by mass.

[0021] In addition to the above-mentioned components, the hair treatment agent according to this embodiment may further contain, as necessary, volatile oils, hydrocarbons, ester oils, organic solvents, nonionic surfactants, antioxidants, UV absorbers, feel improvers, moisturizers, preservatives, fragrances, water, etc. Although a wide variety of conventionally known components can be used for each of these components, it is more preferable to use the following components. As the volatile oil, it is preferable to use decamethylcyclopentasiloxane, dimethicone, isododecane, etc. As the ester oil, it is preferable to use isononyl isononanoate, ethylhexyl isononanoate, octyldodecyl myristate, etc. As the organic solvent, it is preferable to use isopropanol, propylene glycol, dipropylene glycol, glycerin, or the like. As the moisturizing agent, it is preferable to use sorbitol, maltitol, hexylglycerin, etc. As the preservative, it is preferable to use phenoxyethanol, ethylhexylglycerin, etc.

[0022] The oil layer content in the hair treatment agent according to this embodiment is preferably 50% by mass or more and 75% by mass or less. In this embodiment, the oil layer is a layer containing silicone, hydrocarbon, ester oil, anionic surfactant, nonionic surfactant, ethanol, and the like, among the above-mentioned components. On the other hand, the aqueous layer contains anionic surfactants, cationic surfactants, amino-modified silicones, nonionic surfactants, ethanol, preservatives, polyhydric alcohols, acids, salts, water, and the like.

[0023] <Effects of this embodiment> According to the hair treatment agent as described above, the content of the cationic surfactant is within an optimal range, improving the feel of the hair during and after use of the hair treatment, while also containing an anionic surfactant, which allows the oil layer and the aqueous layer to be mixed sufficiently during use and to separate at an appropriate separation rate after use.

[0024] Even when the amount of ethanol contained is kept to 10 mass % or less, the oil layer and the aqueous layer can be firmly separated, so that the irritation and peculiar odor caused by a large amount of ethanol can be minimized.

[0025] Since it contains silicone with a high degree of polymerization, it can improve the feel of hair during and after use. When silicone with a high degree of polymerization is contained, the viscosity increases and the oil layer and water layer tend to become difficult to separate. However, even in such cases, there is no need to add benzyl alcohol, which can cause irritation and discoloration, to facilitate separation, and it is possible to achieve both a pleasant feel and properties such as low irritation and reduced discoloration.

[0026] The present invention is not limited to the above-described embodiment. For example, in the above embodiment, a leave-on type hair treatment agent has been described as a specific example, but the multi-layer separated hair cosmetic composition according to the present invention can be used in a wide range of cosmetics to be applied to hair. In the above example, the two-layer structure, that is, the oil layer and the water layer, has been described, but the structure may have three, four or more layers. In addition, it goes without saying that parts of the above-described embodiments may be combined as appropriate, and various modifications are possible without departing from the spirit of the invention. EXAMPLES

[0027] The present invention will be described in more detail below with reference to specific examples. However, the following examples are merely examples of the present invention, and the present invention is not limited to the following examples. Hair treatment agents having the compositions shown in Tables 1 to 3 below were prepared.

[0028] [Table 1]

[0029] [Table 2]

[0030] [Table 3]

[0031] Each of the Examples and Comparative Examples was evaluated by the following methods, and the results are shown in each table. (Evaluation method for separation) 20 ml of each cosmetic composition was poured into a cylindrical glass bottle with a capacity of 30 ml, and the bottle was capped. The bottle was shaken vertically at an amplitude of about 30 cm, reciprocating about 30 times in 10 seconds. The time until each cosmetic composition began to separate after shaking was visually observed, and the degree of separation was evaluated according to the following evaluation criteria.

[0032] (Evaluation Criteria) When actually using it as a cosmetic, it is expected that the container will be gently shaken about five times, taken out from the hand, and applied in several portions. Therefore, it is desirable for the cosmetic to remain homogenous while it is being used in this manner (90 seconds to 3 minutes). It is also desirable for the cosmetic to separate again after 30 minutes of use, providing a beautiful appearance. In consideration of these points, the following evaluation criteria were established. ◎: Separation occurred between 3 and 15 minutes. ○: Separation occurred between 90 seconds and less than 3 minutes, or between 15 minutes and 30 minutes. △: Separation occurred within 20 seconds or more but less than 90 seconds, or within 30 minutes but less than 1 hour. ×: Separation occurred within 20 seconds beyond 0 or after 1 hour or more.

[0033] (Method of evaluation regarding texture) The feel was evaluated using a hair bundle for evaluation (BS-B3A manufactured by Bealux Corporation). The hair bundle was washed with shampoo ("KOTA Eye Care Shampoo 5" manufactured by COTA Corporation), and then treated with treatment ("KOTA Eye Care Treatment 5" manufactured by COTA Corporation) and thoroughly rinsed to prepare a wet hair bundle. 0.2 g of each cosmetic composition was applied to the hair bundle, and the hair bundle was dried with a hair dryer.

[0034] (Evaluation method) Using each hair bundle treated as above, three evaluators who regularly evaluate cosmetic compositions for hair performed sensory evaluation of "hair softness" and "hair smoothness" by palpation according to the following evaluation criteria. Here, "hair softness" refers to the softness of the hair when the hair bundle is wrapped around a finger, and "hair smoothness" refers to the smoothness of the hair when the hand is passed from the root to the tip of the hair bundle. The evaluation criteria are as follows, and "hair softness" and "hair smoothness" were evaluated comprehensively. In addition, in this evaluation, the evaluations by the three evaluators were either completely consistent for all examples and comparative examples, or only one of the three evaluators gave a one-level better or worse evaluation. When the evaluation results by the three evaluators differed, the evaluations by the three evaluators were decided by majority vote (for example, if the evaluation was ◎ 〇〇, it was decided as 〇). ◎:Very good ○: Better than conventional products △: Equivalent to conventional products ×: Bad

[0035] (Appearance evaluation method) 20 ml of each cosmetic composition was poured into a cylindrical glass bottle with a capacity of 30 ml, and the bottle was capped. The bottle was shaken vertically with an amplitude of 30 cm, reciprocating about 30 times per 10 seconds. The state of each cosmetic composition after shaking was then visually observed after standing for 24 hours, and the appearance was evaluated. As shown in each table, all examples exhibited sufficient separation performance, and the appearance was within a range that could be used as a product. However, examples 10, 17, 21, 22, 25, 26, 27, 28, 29, 30, 31, 32, and 34 were also evaluated as ◯ in terms of appearance, and examples 1, 2, 3, 6, 7, 9, 11, and 35 were evaluated as ◎, which showed a very excellent appearance. (Evaluation Criteria) ◎: Both the oil layer and the water layer are transparent. ○: Either the oil layer or the water layer is transparent, but the other is semi-cloudy. △: Both the oil layer and the water layer are semi-cloudy. ×: Cloudiness or precipitation is observed.

[0036] (Consideration) The results in Table 1 show that in a multi-layer separation type treatment agent containing silicone and ethanol, by containing both a cationic surfactant and an anionic surfactant, it is possible to achieve both an appropriate separation speed and a good feel on the hair. In addition, it can be seen that the above-mentioned effects can be achieved even when the content ratio of the cationic surfactant to the anionic surfactant is changed, as shown in Table 1. It was found that the separation speed tends to slow down when the content of the anionic surfactant is increased, and tends to speed up when the content of the cationic surfactant is decreased. It was confirmed that various types of cationic surfactants can be used, as shown in Table 2. Dialkyl- or monoalkyl-type cationic surfactants can be widely used, and it was found that the use of monoalkyl-type surfactants in particular is preferable because it can improve the appearance of the treatment agent when the content ratio of the cationic surfactant to the anionic surfactant is changed. Furthermore, as shown in Table 3, it was confirmed that a variety of anionic surfactants can be used.

Claims

1. Contains silicone, a cationic surfactant, an anionic surfactant, and ethanol; The silicone contains highly polymerized silicone, a ratio (B / A) of the content (A) of the cationic surfactant to the content (B) of the anionic surfactant is 0.05 or more and 8 or less; An oil layer and a water layer are provided, A multi-layer separated hair cosmetic composition, characterized in that the content of an oil layer is 50% by mass or more and 75% by mass or less.

2. 2. The multi-layer separated hair cosmetic composition according to claim 1, wherein the cationic surfactant is a quaternary cationic surfactant.

3. 2. The multi-layer separated hair cosmetic composition according to claim 1, wherein the cationic surfactant is at least one selected from the group consisting of lauryltrimethylammonium salt, cetyltrimethylammonium salt, stearyltrimethylammonium salt, behenyltrimethylammonium salt, dicocoyldimethylammonium salt, distearyldimethylammonium salt and dialkyl ester ammonium salt.

4. 2. The multi-layer separated hair cosmetic composition according to claim 1, wherein the anionic surfactant is at least one selected from the group consisting of alkyl ether phosphate salts, fatty acid salts, alkyl ether sulfate salts, alkyl sulfate salts, acyl N-methyl taurine salts, alkyl sulfonate salts, alkyl ether carboxylate salts, α-olefin sulfonate salts, and N-acyl amino acid salts.

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