Oil-in-water emulsion composition and hair treatment method

Abstract

To provide an oil-in-water emulsion composition that can reduce skin irritation when a volatile hydrocarbon and / or volatile acyclic silicone are blended with a quaternary ammonium salt and a higher alcohol, and a hair treatment method using the composition. [Solution] The oil-in-water emulsion composition contains (A) a quaternary ammonium salt, (B) a higher alcohol, (C) a volatile hydrocarbon and / or a volatile acyclic silicone, and (D) a highly polymerized methylpolysiloxane and / or a highly polymerized dimethiconol. The hair treatment method uses the above oil-in-water emulsion composition.

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion composition and a hair treatment method using the composition. [Background technology]

[0002] As leave-in hair treatments, aqueous compositions such as oil-in-water emulsions and non-aqueous compositions such as oils are used, and each composition imparts a different feel to the hair. Volatile cyclic silicones are a common ingredient in both compositions, but due to the increasing global demand for cosmetics, there are concerns about the supply of volatile cyclic silicones. Under these circumstances, there is a need to reduce the amount of volatile cyclic silicones used. One disclosure that addresses this issue exists in Patent Document 1, which proposes a hair cosmetic composition containing volatile hydrocarbon oil, non-volatile silicone oil, and vegetable oil with an iodine value of 120 or less, and also discloses a formulation example that does not contain volatile cyclic silicones. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2009-91259 [Overview of the project] [Problems that the invention aims to solve]

[0004] Incidentally, when an oil-in-water emulsion composition containing a quaternary ammonium salt and a higher alcohol is used as a leave-in hair treatment, it can impart softness and other textures to the hair. However, during use, the composition may adhere to the skin, such as the scalp, forehead, and neck, and the quaternary ammonium may cause skin irritation. In particular, if volatile components such as volatile hydrocarbons and volatile acyclic silicones are included, drying with hot air during use can cause these volatile components to evaporate, concentrating the quaternary ammonium and making skin irritation more likely. If skin irritation occurs, it can be removed by washing the adhered composition with water, but it is also desirable to reduce skin irritation.

[0005] In view of the above circumstances, the present invention aims to provide an oil-in-water emulsion composition that can reduce skin irritation when a volatile hydrocarbon and / or volatile acyclic silicone are blended together with a quaternary ammonium salt and a higher alcohol, and a hair treatment method using the composition. [Means for solving the problem]

[0006] The inventors diligently studied oil-in-water emulsion compositions containing (A) quaternary ammonium salts, (B) higher alcohols, and (C) volatile hydrocarbons and / or volatile acyclic silicones. As a result, they discovered that skin irritation can be reduced by incorporating (D) highly polymerized methylpolysiloxane and / or highly polymerized dimethiconol, thus completing the present invention.

[0007] The present invention includes the following [1] to

[10] . [1] An oil-in-water emulsion composition comprising the following components (A), (B), (C), and (D). (A) Quaternary ammonium salt (B) Higher alcohol (C) Volatile hydrocarbons and / or volatile acyclic silicones (D) Highly polymerized methylpolysiloxane and / or highly polymerized dimethiconol

[0008] [2] The oil-in-water emulsion composition according to [2], wherein the amount of volatile cyclic silicone is less than 5% by mass or none at all. The composition according to the present invention [2] can reduce the amount of volatile cyclic silicone, which is subject to supply concerns.

[0009] [3] An oil-in-water emulsion composition according to [1] or [2], comprising the following component (E). (E) Higher fatty acids The composition of the present invention [3] can further reduce skin irritation.

[0010] [4] An oil-in-water emulsion composition according to any one of [1] to [3], wherein component (A) is a di-long-chain alkyldimethylammonium salt. The composition of the present invention [4] can impart a texture to the hair due to the inclusion of a di-long-chain alkyldimethylammonium salt.

[0011] [5] The oil-in-water emulsion composition according to [4], wherein the ratio of the amount of di-long-chain alkyldimethylammonium salt to the amount of component (A) is 0.65 or less. The composition of the present invention [5] can reduce skin irritation caused by the inclusion of di-long-chain alkyldimethylammonium salt.

[0012] [6] An oil-in-water emulsion composition according to any one of [1] to [5], wherein the component (C) is a volatile hydrocarbon, and the amount of the volatile hydrocarbon is 5.0% by mass or more and 35% by mass or less. With the composition of the present invention [6], since the amount of volatile hydrocarbon is 5.0% by mass or more, the drying of the composition can be accelerated, and since the amount of volatile hydrocarbon is 35% by mass or less, the concentration of quaternary ammonium, which is a cause of skin irritation, can be suppressed.

[0013] [7] An oil-in-water emulsion composition according to any one of [1] to [6], wherein the component (C) is a volatile acyclic silicone, and the amount of the volatile acyclic silicone is 5.0% by mass or more and 35% by mass or less. With the composition of the present invention [7], since the amount of volatile acyclic silicone is 5.0% by mass or more, the drying of the composition can be accelerated, and since the amount of volatile acyclic silicone is 35% by mass or less, the concentration of quaternary ammonium, which is a cause of skin irritation, is suppressed.

[0014] [8] An oil-in-water emulsion composition according to any one of [1] to [7], wherein the amount of component (A) is 0.1% by mass or more and 5.0% by mass or less, the amount of component (B) is 1.0% by mass or more and 7.0% by mass or less, the amount of component (C) is 5.0% by mass or more and 35% by mass or less, and the amount of component (D) is 0.5% by mass or more and 6.0% by mass or less.

[0015] [9] An oil-in-water emulsion composition according to any one of [1] to [8] used as a leave-in hair treatment. The composition of the present invention [9] can impart a texture to the hair due to the combination of components (A) and (B).

[0016] A hair treatment method using an oil-in-water emulsion composition described in any of

[10] to [9]. With the composition of the present invention

[10] , the texture can be imparted to the hair by the combination of components (A) and (B), and component (D) reduces the skin irritation caused by the combination of component (A). [Effects of the Invention]

[0017] According to the oil-in-water emulsion composition of the present invention, since it contains highly polymerized methylpolysiloxane and / or highly polymerized dimethiconol, skin irritation caused by the inclusion of quaternary ammonium salts can be reduced.

[0018] Furthermore, according to the hair treatment method of the present invention, the highly polymerized methylpolysiloxane and / or highly polymerized dimethiconol incorporated in the oil-in-water emulsion composition used reduces skin irritation caused by the inclusion of quaternary ammonium salts.

Embodiments for Carrying out the Invention

[0019] Based on the embodiments of the present invention, the present invention will be described below. The oil-in-water type emulsion composition according to this embodiment is one in which the following components (A), (B), (C), and (D) are blended (the blending amount of water is, for example, 60% by mass or more and 90% by mass or less). Further, in the oil-in-water type emulsion composition according to this embodiment, as optional components, components blended in known oil-in-water type emulsion compositions may be blended. (A) Quaternary ammonium salt (B) Higher alcohol (C) Volatile hydrocarbon and / or volatile acyclic silicone (D) Highly polymerized methylpolysiloxane and / or highly polymerized dimethiconol

[0020] (Component (A) Quaternary ammonium salt) In the oil-in-water type emulsion composition of this embodiment, a quaternary ammonium salt as component (A) is blended. The quaternary ammonium salt is a component that repairs hair, and a cream-type composition can be realized by blending it with a higher alcohol.

[0021] One or more quaternary ammonium salts may be blended in the oil-in-water type emulsion composition of this embodiment. The blending amount of the quaternary ammonium salt in the composition is appropriately set, but 0.1% by mass or more and 7.0% by mass or less is preferable, 0.3% by mass or more and 5.0% by mass or less is more preferable, 0.5% by mass or more and 4.0% by mass or less is even more preferable, 0.7% by mass or more and 3.0% by mass or less is still more preferable, and 1.0% by mass or more and 2.0% by mass or less is even more preferable. When the blending amount is 0.1% by mass or more, a soft feeling of hair can be expected, and when it is 7.0% by mass or less, it is suitable for reducing skin irritation.

[0022] Examples of the above quaternary ammonium salts include known quaternary ammonium salts, such as alkyl quaternary ammonium salts like long-chain alkyltrimethyl quaternary ammonium salts, dilong-chain alkyldimethyl quaternary ammonium salts, and long-chain alkyl ether type quaternary ammonium salts, as well as benzalkonium type quaternary ammonium salts (the number of carbon atoms in the alkyl group of the "long-chain alkyl" is preferably 12 to 22, and from the viewpoint of imparting a pleasant feel, 16 to 22 is preferable). Examples of long-chain alkyltrimethyl quaternary ammonium salts include lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, and behenyltrimethylammonium methosulfate. Examples of dilong-chain alkyldimethyl quaternary ammonium salts include dicetyldimethylammonium chloride, distearyldimethylammonium chloride, dialkyl(C12~18)dimethylammonium chloride, and dialkyl(C14~18)dimethylammonium chloride. An example of a long-chain alkyl ether type quaternary ammonium salt is stearoxypropyltrimethylammonium chloride.

[0023] In the oil-in-water emulsion composition of this embodiment, when a di-long-chain alkyldimethylammonium salt is incorporated as component (A), the ratio of the amount of di-long-chain alkyldimethylammonium salt to the amount of component (A) is preferably 0.05 to 0.65, more preferably 0.10 to 0.55, more preferably 0.20 to 0.50, and even more preferably 0.30 to 0.45. A ratio of 0.05 or higher is suitable for imparting a tactile feel to the hair by incorporating the di-long-chain alkyldimethylammonium salt, and a ratio of 0.65 or lower is suitable for reducing skin irritation that is likely to occur with the incorporation of the di-long-chain alkyldimethylammonium salt.

[0024] (Component (B): Higher alcohol) The oil-in-water emulsion composition of this embodiment contains a higher alcohol, which is component (B). The higher alcohol exhibits a viscosity-modifying effect that improves the viscosity of the composition, and when combined with a quaternary ammonium salt, it is possible to create a cream-type composition.

[0025] The oil-in-water emulsion composition of this embodiment may contain one or more higher alcohols. The amount of higher alcohols in the composition can be set as appropriate, but is preferably 1.0% to 7.0% by mass, more preferably 1.5% to 5.0% by mass, more preferably 2.0% to 4.0% by mass, and even more preferably 2.0% to 3.0% by mass. An amount of 1.0% by mass or more is suitable for increasing the viscosity of the oil-in-water emulsion composition, while an amount of 7.0% by mass or less is suitable for decreasing the viscosity of the oil-in-water emulsion composition.

[0026] The above-mentioned higher alcohol is a monohydric alcohol having 6 or more carbon atoms, preferably a saturated alcohol with 16 to 22 carbon atoms. Examples of such higher alcohols include well-known higher alcohols, such as linear saturated alcohols like lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, arachidyl alcohol, and behenyl alcohol; linear unsaturated alcohols like oleyl alcohol; and branched saturated alcohols like hexyldecanol, octyldodecanol, isocetyl alcohol, dodecylhexadecanol, isostearyl alcohol, and tetradecyloctadecanol.

[0027] (Component (C) Volatile hydrocarbons and / or volatile acyclic silicones) The oil-in-water emulsion composition of this embodiment contains a volatile hydrocarbon, a volatile acyclic silicone, or both a volatile hydrocarbon and a volatile acyclic silicone as component (C). The oil-in-water emulsion composition of this embodiment may be free of volatile hydrocarbons and volatile acyclic silicones, as long as either a volatile hydrocarbon or a volatile acyclic silicone is included. The inclusion of a highly volatile component (C) facilitates the drying of hair to which the oil-in-water emulsion composition of this embodiment has been applied.

[0028] The oil-in-water emulsion composition of this embodiment may contain one or more selected from volatile hydrocarbons and volatile acyclic silicones. The amount of component (C) in the composition is preferably 5.0% to 35% by mass, more preferably 10% to 30% by mass, more preferably 15% to 25% by mass, and even more preferably 15% to 20% by mass. An amount of component (C) of 5.0% by mass or more is suitable for drying hair, and an amount of 35% by mass or less is suitable for suppressing concentration when using quaternary ammonium, which can cause skin irritation.

[0029] When a volatile hydrocarbon is incorporated as component (C) in the oil-in-water emulsion composition of this embodiment, it is preferable to incorporate one or more types of volatile hydrocarbons. The amount of volatile hydrocarbons in the composition is preferably 5.0% by mass or more and 35% by mass or less, preferably 10% by mass or more and 30% by mass or less, more preferably 15% by mass or more and 25% by mass or less, and even more preferably 15% by mass or more and 20% by mass or less. When the amount of volatile hydrocarbons is 5.0% by mass or more, it is suitable for drying hair, and when it is 35% by mass or less, it is suitable for suppressing concentration when using quaternary ammonium, which can cause skin irritation.

[0030] The above volatile hydrocarbon has a kinematic viscosity of 5.0 mm at 37.8°C. 2 It is a hydrocarbon with a kinematic viscosity of less than / s. This kinematic viscosity is 4.5 mm, from the viewpoint of facilitating hair drying. 2 A kinematic viscosity of less than / s is desirable, and less than 4.0 is preferred. The lower limit of this kinematic viscosity is, for example, 1.2 mm. 2 It is / s or greater.

[0031] Furthermore, the above-mentioned volatile hydrocarbons are preferably those with a flash point of 40°C to 105°C, more preferably those with a flash point of 50°C to 90°C, more preferably those with a flash point of 60°C to 80°C, and even more preferably those with a flash point of 65°C to 70°C. A flash point of 40°C or higher is preferable from the viewpoint of improving the manageability of hair when drying, and a flash point of 105°C or lower is preferable from the viewpoint of facilitating hair drying. The flash point should be measured by a known and suitable method. For example, Japanese Industrial Standard JIS K 2265 discloses that the Tag closure method is suitable when the flash point range is 93°C or lower, and that the Cleveland open method is suitable when the flash point range exceeds 79°C.

[0032] The above-mentioned volatile hydrocarbon may be any known volatile hydrocarbon, such as isododecane or hydrogenated polyisobutene (light isoparaffin, light liquid isoparaffin, etc.).

[0033] When isododecane is incorporated as component (C), the amount of isododecane in the oil-in-water emulsion composition of this embodiment is preferably 5.0% by mass or more and 35% by mass or less, more preferably 10% by mass or more and 30% by mass or less, more preferably 15% by mass or more and 25% by mass or less, and even more preferably 15% by mass or more and 20% by mass or less. An isododecane amount of 5.0% by mass or more is preferable from the viewpoint of facilitating hair drying, and an amount of 35% by mass or less is preferable from the viewpoint of improving the manageability of the hair when drying it.

[0034] Furthermore, when light liquid isoparaffin is incorporated as component (C), the amount of light liquid isoparaffin in the oil-in-water emulsion composition of this embodiment is preferably 5.0% by mass or more and 35% by mass or less, more preferably 10% by mass or more and 30% by mass or less, more preferably 15% by mass or more and 25% by mass or less, and even more preferably 15% by mass or more and 20% by mass or less. An amount of light liquid isoparaffin of 5.0% by mass or more is preferable from the viewpoint of improving the manageability of hair when drying, and an amount of 35% by mass or less is preferable from the viewpoint of facilitating hair drying. Note that by incorporating both isododecane and light liquid isoparaffin into the oil-in-water emulsion composition of this embodiment and adjusting the respective amounts, the ease of hair drying and the manageability of hair when drying can be adjusted.

[0035] When a volatile acyclic silicone is incorporated as component (C) in the oil-in-water emulsion composition of this embodiment, it is preferable to incorporate one or more types of volatile acyclic silicones. The amount of volatile acyclic silicone in the composition is preferably 5.0% by mass or more and 35% by mass or less, preferably 10% by mass or more and 30% by mass or less, more preferably 15% by mass or more and 25% by mass or less, and even more preferably 15% by mass or more and 20% by mass or less. When the amount of volatile acyclic silicone is 5.0% by mass or more, it is suitable for smooth handling of hair when drying, and when it is 35% by mass or less, it is suitable for reducing the cost of the oil-in-water emulsion composition.

[0036] The above-mentioned volatile acyclic silicone does not have a cyclic skeleton in its molecular structure, unlike volatile acyclic silicones such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. Furthermore, the kinematic viscosity of the above-mentioned volatile acyclic silicone at 25°C is 5.0 mm². 2 The temperature is less than / s, and to make hair drying easier, use 3.0mm. 2 / s or less is preferable, 2.5mm 2 Preferably less than / s, and 2.0 mm 2 A value of / s or less is more preferable (the lower limit of kinematic viscosity can be set, for example, 1.0 mm). 2 It should be at least / s.

[0037] The above-mentioned volatile acyclic silicone may be any known volatile acyclic silicone, such as linear dimethylpolysiloxanes like trisiloxane, branched silicones like methyl trimethicone, or silicones having alkyl groups as side chains, such as ethyl methicone.

[0038] (Component (D) Highly polymerized methylpolysiloxane and / or highly polymerized dimethiconol) The oil-in-water emulsion composition of this embodiment contains component (D), which is high polymer methylpolysiloxane, high polymer dimethiconol, or high polymer methylpolysiloxane and high polymer dimethiconol. The oil-in-water emulsion composition of this embodiment may be composed of either high polymer methylpolysiloxane or high polymer dimethiconol, but may be composed without high polymer methylpolysiloxane or high polymer dimethiconol. The inclusion of component (D) can reduce skin irritation.

[0039] The oil-in-water emulsion composition of this embodiment may contain one or more selected from highly polymerized methylpolysiloxane and highly polymerized dimethiconol. The amount of component (D) in the composition can be set as appropriate, but is preferably 0.5% by mass or more and 6.0% by mass or less, preferably 1.0% by mass or more and 5.0% by mass or less, and more preferably 2.0% by mass or more and 4.0% by mass or less. An amount of 0.5% by mass or more is suitable for reducing skin irritation, and an amount of 6.0% by mass or less is suitable for lowering the viscosity of the oil-in-water emulsion composition.

[0040] The above-mentioned highly polymerized methylpolysiloxane is a linear polymer with a siloxane bond as its backbone and an average degree of polymerization of 650 or more. It is preferable to incorporate one or more types selected from known highly polymerized methylpolysiloxanes as component (D). The amount of the highly polymerized methylpolysiloxane incorporated in the oil-in-water emulsion composition according to this embodiment is preferably 0.5% by mass or more and 6.0% by mass or less, preferably 1.0% by mass or more and 5.0% by mass or less, and more preferably 2.0% by mass or more and 4.0% by mass or less. An amount of 0.5% by mass or more is suitable for reducing skin irritation, and an amount of 6.0% by mass or less is suitable for lowering the viscosity of the oil-in-water emulsion composition.

[0041] The above-mentioned highly polymerized dimethiconol is a linear polymer with an average degree of polymerization of 650 or more, with a siloxane bond having a hydroxyl group at the terminal as its backbone. It is preferable to incorporate one or more types selected from known highly polymerized dimethiconols as component (D). The amount of the highly polymerized dimethiconol incorporated in the oil-in-water emulsion composition according to this embodiment is preferably 0.5% by mass or more and 6.0% by mass or less, preferably 1.0% by mass or more and 5.0% by mass or less, and more preferably 2.0% by mass or more and 4.0% by mass or less. An amount of 0.5% by mass or more is suitable for reducing skin irritation, and an amount of 6.0% by mass or less is suitable for reducing the viscosity of the oil-in-water emulsion composition.

[0042] (optional ingredient) The oil-in-water emulsion composition of this embodiment may contain components that are used in known oil-in-water emulsion compositions as optional components. However, due to supply concerns, it is preferable to avoid the inclusion of volatile cyclic silicones such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, or to limit their amount. The amount of volatile cyclic silicone in the oil-in-water emulsion composition of this embodiment is preferably less than 5% by mass, more preferably less than 3% by mass, more preferably less than 1% by mass, even more preferably less than 0.1% by mass, and even more preferably less than 0.05% by mass.

[0043] Furthermore, component (E), a higher fatty acid, is suitable as an ingredient to be incorporated into the oil-in-water emulsion composition of this embodiment. The inclusion of component (E) improves the reduction of skin irritation. The oil-in-water emulsion composition of this embodiment may contain one or more higher fatty acids. The amount of higher fatty acids in the composition is set as appropriate, but for example, it may be 0.05% by mass or more and 4.0% by mass or less, 0.1% by mass or more and 4.0% by mass or less, 0.3% by mass or more and 2.0% by mass or less, or 0.5% by mass or more and 1.0% by mass or less.

[0044] The above-mentioned higher fatty acids are monocarboxylic acids having 6 or more carbon atoms, and higher fatty acids having 16 to 22 carbon atoms are preferred from the viewpoint of imparting a pleasant feel to the hair. Examples of such higher fatty acids include known higher fatty acids, such as branched fatty acids like 2-ethylhexanoic acid, isononanoic acid, dimethyloctane, isopalmitic acid, and isostearic acid; and straight-chain fatty acids like lauric acid, myristic acid, palmitin, and stearic acid.

[0045] (Dosage form) The dosage form of the oil-in-water emulsion composition of this embodiment is not particularly limited and may be liquid, cream, or mist.

[0046] (viscosity) The viscosity of the oil-in-water emulsion composition of this embodiment is preferably 1,000 mPa·s or more and less than 30,000 mPa·s, more preferably 3,000 mPa·s or more and less than 20,000 mPa·s, and more preferably 5,000 mPa·s or more and less than 15,000 mPa·s. A viscosity of 1,000 mPa·s or more is suitable for handling when applying the oil-in-water emulsion composition of this embodiment by hand, and a viscosity of less than 30,000 mPa·s is suitable for penetration into the hair. The viscosity of the oil-in-water emulsion composition of this embodiment is the value obtained 60 seconds after the start of viscosity measurement when measured using a B-type viscometer (temperature: 25°C, rotor: appropriately set according to viscosity, rotor rotation speed: appropriately set according to viscosity).

[0047] (pH) The pH of the oil-in-water type emulsion composition of the present embodiment is, for example, 3.0 or more and 5.5 or less.

[0048] (Use) The oil-in-water type emulsion composition of the present embodiment is used as a composition for hair treatment and is preferably used as a treatment for hair that is not washed away. When using, it is targeted at hair with a history of chemical treatment (history by treatments such as oxidative hair dyeing treatment, bleaching treatment, hair straightening treatment, etc.) and hair without such treatment history. For example, after washing hair and blotting the moisture with a towel, the oil-in-water type emulsion composition of the present embodiment is sprayed or applied by hand to the wet hair, and then dried with warm air as necessary before use.

Examples

[0049] Hereinafter, the present invention will be described in detail based on examples, but the present invention is not limitedly interpreted based on the description of these examples. [[ID=​​​​​​​​​​​​ (Skin irritation evaluation) The skin irritation of the compositions in the Examples, Comparative Examples, and Reference Examples was evaluated based on the skin irritation index using human patch tests. In this evaluation, each composition in the Examples, etc., was used as the test sample, and physiological saline was used as the reference sample. The human patch test method described in Reference 1 below was followed (a certain amount of the test sample, which had been left at 37°C for more than 2 hours until the change in mass over time was almost imperceptible, was applied to the upper arm (for the reference sample, it was applied to the upper arm without drying before application), the application time was 24 hours, occlusion, and the number of subjects was 10). The skin reaction of each subject 1-2 hours after patch removal and 24 hours later was scored using the index shown in Table 1. Of the scores obtained 1-2 hours after patch removal and 24 hours later, the higher value was adopted as the "subject's score" for each subject, and the skin irritation index was calculated using the formula shown below. Furthermore, in this skin irritation evaluation, there were no false positive subjects (subjects who showed a reaction of 0.5 or higher with the reference product, physiological saline, 1-2 hours or 24 hours after patch removal).

[0053] Reference 1: Japan Cosmetic Industry Association (ed.), Yakuji Nippo Co., Ltd. (publisher), Guidelines on Safety Evaluation of Cosmetics 2015, Publication Date: November 25, 2015, pp. 48-49.

[0054] [Table 1]

[0055] Skin irritation index = (Sum of each subject's score / Number of subjects excluding false positives) × 100

[0056] Tables 2-4 below show the components, amounts, and skin irritation evaluation results (skin irritation index) of the compositions for the examples, comparative examples, and reference examples. A lower "skin irritation index" indicates less skin irritation.

[0057] [Table 2]

[0058] Table 2 shows that, by comparing Example 1a with Comparative Example 1, it can be confirmed that the skin irritation index decreased when component (D), high polymer methylpolysiloxane, was included. Furthermore, by comparing Example 1a with Examples 1b-1c, it can be confirmed that skin irritation decreased even further when component (E) was added.

[0059] [Table 3]

[0060] Table 3 shows that, by comparing Example 2a with Examples 2b-2c, it can be confirmed that as the "composition ratio of di-long-chain alkyldimethylammonium salt / (A)" decreases from 0.65, the skin irritation index tends to decrease.

[0061] [Table 4]

[0062] Table 4 confirms that the inclusion of dialkyl(C12-18)dimethylammonium chloride tended to increase the skin irritation index.

Claims

1. An oil-in-water emulsion composition comprising the following components (A), (B), (C), and (D). (A) Quaternary ammonium salts (B) Higher alcohols (C) Volatile hydrocarbons and / or volatile acyclic silicones (D) Highly polymerized methylpolysiloxane and / or highly polymerized dimethiconol

2. The oil-in-water emulsion composition according to claim 1, wherein the amount of volatile cyclic silicone is less than 5% by mass or no volatile cyclic silicone is included.

3. An oil-in-water emulsion composition according to claim 1, comprising the following component (E). (E) Higher fatty acids

4. The oil-in-water emulsion composition according to any one of claims 1 to 3, wherein the component (A) is a di-long-chain alkyldimethylammonium salt.

5. The oil-in-water emulsion composition according to claim 4, wherein the ratio of the amount of dilong-chain alkyldimethylammonium salt to the amount of component (A) is 0.65 or less.

6. The oil-in-water emulsion composition according to any one of claims 1 to 3, wherein the component (C) is a volatile hydrocarbon, and the amount of the volatile hydrocarbon is 5.0% by mass or more and 35% by mass or less.

7. The oil-in-water emulsion composition according to any one of claims 1 to 3, wherein the component (C) is a volatile acyclic silicone, and the amount of the volatile acyclic silicone is 5.0% by mass or more and 35% by mass or less.

8. The amount of component (A) is 0.1% by mass or more and 5.0% by mass or less. The amount of component (B) is 1.0% by mass or more and 7.0% by mass or less. The amount of component (C) is 5.0% by mass or more and 35% by mass or less. The amount of component (D) is 0.5% by mass or more and 6.0% by mass or less. An oil-in-water emulsion composition according to any one of claims 1 to 3.

9. An oil-in-water emulsion composition according to any one of claims 1 to 3, used as a leave-in hair treatment.

10. A hair treatment method using the oil-in-water emulsion composition according to any one of claims 1 to 3.

Images