Multilayer-separated hair cosmetic

Abstract

To provide a multilayer-separated hair cosmetic which, while enhancing hair feel beyond conventional levels, is able to realize appropriate phase separation.SOLUTION: A multilayer-separated hair cosmetic comprises silicone, a cationic surfactant, an anionic surfactant, and ethanol.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a multi-layer separated hair cosmetic composition having a separated oil layer and an aqueous layer, 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] Japanese Patent Application Publication No. 2018-162222 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-43399 Summary of the Invention [Problem to be solved by the invention]

[0004] The present inventors have investigated ways to improve the feel of hair after use in the conventional two-layer separation type hair cosmetics described above, and have found that the feel of hair can be improved even more than before by adding a cationic surfactant. However, they have also noticed that increasing the content of the cationic surfactant makes it difficult for the oil layer and the water layer to separate, and this 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 view of the above-mentioned problems, and aims to provide a multi-layer separation type hair cosmetic composition that 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 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 salt, cetyltrimethylammonium salt, stearyltrimethylammonium salt, behenyltrimethylammonium salt, dicocoyldimethylammonium salt, distearyldimethylammonium salt, and dialkyl ester ammonium salt. [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 ester salts, fatty acid salts, alkyl ether sulfates, alkyl sulfate ester 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, and the content of the oil layer is 50% by mass or more and 75% by mass or less. [Effects 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 INVENTION

[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, the following will explain a leave-on type hair treatment as an example.

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

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

[0011] The silicone may be, 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. Among these silicones, it is preferable to use one having a number-average degree of polymerization of 1,000 to 5,000, and more preferably one having a number-average degree of polymerization of 1,300 to 5,000.

[0012] Only one of the silicones described above may be used, or two or more different types or different number-average degrees of polymerization may be used in combination. Preferably, a low-polymerization silicone having a number-average degree of polymerization of less than 1000 is used in combination with a high-polymerization silicone having a number-average degree of polymerization of 1000 or more and 5000 or less.

[0013] The silicone content of the entire treatment agent is preferably 10% to 60% by mass, more preferably 15% to 55% by mass, and even more preferably 20% to 50% by mass. This content refers to the total content when two or more types of silicone are used in combination. Furthermore, when two or more types of silicone with different number-average degrees of polymerization are used in combination, the proportion of the aforementioned high-polymerization silicone is preferably in the range of 2% to 20% by mass of the entire treatment agent.

[0014] The mass ratio of the content of high polymerized silicone and ethanol in the entire treatment agent (ethanol / silicone gum) is preferably 0.05 or more and 8 or less, more preferably 0.1 or more and 6 or less, and particularly preferably 0.5 or more and 4 or less. By setting the mass ratio of the content of high polymerized silicone and ethanol (ethanol / silicone gum) to 0.05 or more and 8 or less, 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 lauryltrimethylammonium salt, cetyltrimethylammonium salt, stearyltrimethylammonium salt, behenyltrimethylammonium salt, dicocoyldimethylammonium salt, distearyldimethylammonium 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 ethylhydroxyethylmonium 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% by mass to 1.0% by mass, more preferably from 0.03% by mass to 0.5% by mass, and even more preferably from 0.05% by mass to 0.3% by mass.

[0017] Various anionic surfactants can be used, such as 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, and acyl lactates. Specific examples 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, and sodium isostearoyl lactylate. It is preferable to use one or more selected from the group consisting of sodium dioleth-8 phosphate, sodium laurate, sodium laureth sulfate, sodium cetyl sulfate, sodium cocoyl methyl 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 are particularly preferred.

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

[0019] The mass ratio (B / A) of the cationic surfactant content (A) to the anionic surfactant content (B) in the treatment agent according to 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 10% by mass or less, more preferably 8% by mass or less, and even more preferably 5% by mass or less.

[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. 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, sorbitol, maltitol, hexylglycerin, etc. are preferably used. 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 described above, the content of the cationic surfactant is set 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 sufficiently mixed during use and to separate at an appropriate separation rate after use.

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

[0025] Because 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 separation of the oil and water layers tends to be difficult. 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 used on hair. Furthermore, in the above example, the explanation was given for the structure having two layers, an oil layer and a water layer, 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 within the scope of the spirit thereof. [Example]

[0027] The present invention will be described in more detail below based on 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 example and comparative example was evaluated by the following methods, and the results are shown in the tables. (Evaluation method for separation) 20 ml of each cosmetic composition was poured into a 30 ml cylindrical glass bottle and the bottle was capped. The bottle was then shaken vertically at an amplitude of approximately 30 cm, approximately 30 times in 10 seconds. The time until each cosmetic composition began to separate after shaking was visually observed, and separation was evaluated according to the following evaluation criteria.

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

[0033] (Evaluation method for texture) The feel was evaluated using a hair bundle for evaluation (BS-B3A manufactured by Beaulux). The hair bundle was washed with shampoo ("KOTA Eye Care Shampoo 5" manufactured by COTA Corporation), 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 of the hair strands treated as described above, three evaluators who routinely evaluate hair cosmetic compositions conducted sensory evaluations of "hair softness" and "hair smoothness" by palpation according to the following evaluation criteria. Here, "hair softness" refers to the soft feel of hair when the strand is wrapped around the fingers, and "hair smoothness" refers to the smooth feel of hair when the hand is passed through the strand from the root to the tip, with uniform smoothness from the root to the tip. The evaluation criteria are as follows, and "hair softness" and "hair smoothness" were comprehensively evaluated. In this evaluation, for all Examples and Comparative Examples, either the evaluations by the three evaluators were completely consistent, or only one of the three evaluators gave a rating of one level better or worse. If 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 ◎, it was evaluated as ○). ◎: 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 30 ml cylindrical glass bottle and capped. The bottle was shaken vertically at an amplitude of 30 cm, reciprocating approximately 30 times per 10 seconds. After shaking, each cosmetic composition was left to stand for 24 hours, after which it was visually observed and its appearance was evaluated. As shown in the tables, all Examples exhibited sufficient separation performance, and the appearance was within a range acceptable for practical use as a product. Examples 10, 17, 21, 22, 25, 26, 27, 28, 29, 30, 31, 32, and 34 were also rated as ◯ for appearance, and Examples 1, 2, 3, 6, 7, 9, 11, and 35 were rated as ⊚, showing 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 by incorporating both a cationic surfactant and an anionic surfactant into a multi-layer separation treatment agent containing silicone and ethanol, it is possible to achieve both an appropriate separation speed and a good feel on the hair. Furthermore, as shown in Table 1, 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. It was found that the separation rate 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 cationic surfactants can be widely used, and it was found that the use of monoalkyl surfactants in particular is preferable because it can improve the appearance of the treatment agent when the content ratio of cationic surfactant to anionic surfactant is changed. Furthermore, as shown in Table 3, it was confirmed that a variety of anionic surfactants can be used.

Claims

1. A multi-layer separated hair cosmetic composition comprising a silicone, a cationic surfactant, an anionic surfactant, and ethanol.

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

4. 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.

5. 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 ester salts, fatty acid salts, alkyl ether sulfates, alkyl sulfate ester salts, acyl N-methyl taurine salts, alkyl sulfonates, alkyl ether carboxylate salts, α-olefin sulfonates, and N-acyl amino acid salts.

6. An oil layer and a water layer are provided, The multi-layer separated hair cosmetic according to claim 1, wherein the content of the oil layer is 50% by mass or more and 75% by mass or less.

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