Non-aqueous composition and hair treatment method

Abstract

To provide a nonaqueous composition which is suitable for reducing the amount of a volatile cyclic silicone to be used, contains an ultraviolet absorber, and is applied to the skin or hair, and to provide a hair treatment method using the nonaqueous composition for countermeasures against ultraviolet rays.SOLUTION: The non-aqueous composition contains an ultraviolet absorber and a volatile hydrocarbon and is used for the skin or the hair, and the hair treatment method comprises treating the hair with the non-aqueous composition.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a non-aqueous composition for skin or hair, and a method of treating hair using the non-aqueous composition. [Background technology]

[0002] Hair is exposed to sunlight in daily life and is affected by the ultraviolet rays contained in sunlight. Reported effects include hair damage and discoloration of color-treated hair. It is also widely known that UV rays can affect the skin.

[0003] It is well known that UV absorbers are incorporated into hair cosmetics to protect hair from UV rays, and there are hair products on the market. Some of these products are labeled with a Protection Grade of UVA (PA), which is an index of protection against UVA rays, or a Sun Protection Factor (SPF), which is an index of protection against UVB rays, and this labeling can increase consumer purchasing interest. Furthermore, the skin-protecting properties indicated by PA or SPF (hereinafter sometimes referred to as "PA, etc.") can also be used for skin applications.

[0004] Hair cosmetics containing UV absorbers have also been disclosed in literature; for example, Patent Document 1 discloses a non-aqueous hair cosmetic containing a UV absorber, a volatile cyclic silicone, and the like. Because this cosmetic is non-aqueous, it can impart a different feel to hair than aqueous products. However, the volatile cyclic silicone contained therein is a highly versatile ingredient used in non-aqueous hair cosmetics, and with demand for cosmetics increasing worldwide, there are concerns about its supply. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-109954 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above circumstances, an object of the present invention is to provide a non-aqueous composition that is applied to skin or hair and contains an ultraviolet absorber, which is suitable for reducing the amount of volatile cyclic silicone used, and a hair treatment method that uses the non-aqueous composition for ultraviolet protection. [Means for solving the problem]

[0007] The non-aqueous composition according to the present invention is for skin or hair and contains an ultraviolet absorber and a liquid hydrocarbon.

[0008] The non-aqueous composition according to the present invention preferably has a viscosity of 50 mPa·s or more. A viscosity of 50 mPa·s or more is suitable for improving PA etc. (PA or SPF).

[0009] The non-aqueous composition according to the present invention contains a volatile hydrocarbon as the liquid hydrocarbon, and the amount of the volatile hydrocarbon is preferably 20% by mass or more, and more preferably 30% by mass or more. Volatile cyclic silicones such as decamethylcyclopentasiloxane, which are classified as volatile silicones, are highly versatile components, and there are concerns about supply due to the increasing global demand for cosmetics. However, the incorporation of 20% by mass or more of the volatile hydrocarbon is suitable for reducing the amount of volatile cyclic silicone used.

[0010] In the non-aqueous composition according to the present invention, the volatile hydrocarbon may have a kinematic viscosity lower than that of decamethylcyclopentasiloxane. The incorporation of a volatile hydrocarbon with a low kinematic viscosity can serve as a substitute for decamethylcyclopentasiloxane. Furthermore, the incorporation of such a volatile hydrocarbon may result in a decrease in PA and other properties due to a decrease in the viscosity of the non-aqueous composition. However, by setting the viscosity of the non-aqueous composition to 50 mPa·s or higher, as described above, this decrease in PA and other properties can be suppressed.

[0011] The non-aqueous composition according to the present invention preferably contains an ultraviolet absorber in an amount of 1.0% by mass or more. Since the incorporation of a certain amount of ultraviolet absorber is effective in protecting the skin or hair from ultraviolet rays, it is preferable that the amount of ultraviolet absorber be 1.0% by mass or more.

[0012] The non-aqueous composition according to the present invention may preferably contain no volatile cyclic silicone or may contain a larger amount of the liquid hydrocarbon than the volatile cyclic silicone, which is suitable for reducing the amount of volatile cyclic silicone used.

[0013] The hair treatment method according to the present invention is characterized by using the non-aqueous composition according to the present invention. [Effects of the Invention]

[0014] According to the non-aqueous composition of the present invention, a liquid hydrocarbon is blended together with an ultraviolet absorber, so that it is possible to protect the skin or hair from ultraviolet rays while reducing the amount of volatile cyclic silicone used.

[0015] Furthermore, the hair treatment method according to the present invention uses a non-aqueous composition containing a liquid hydrocarbon together with an ultraviolet absorber, making it possible to protect the skin or hair from ultraviolet rays while reducing the amount of volatile cyclic silicone used. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present invention will be described below based on the embodiments of the present invention. The non-aqueous composition according to this embodiment contains an ultraviolet absorber and a liquid hydrocarbon, and is used for skin or hair.

[0017] The composition of this embodiment is non-aqueous, and "non-aqueous" means that the external phase of the composition does not have an oil phase or an aqueous phase. Furthermore, since the incorporation of water tends to cause separation of the aqueous phase and the oil phase and the composition to become cloudy, it is preferable not to incorporate water. If water is incorporated, the amount of water incorporated is preferably less than 5.0% by mass, preferably less than 3.0% by mass, more preferably less than 1.0% by mass, even more preferably less than 0.5% by mass, and even more preferably less than 0.1% by mass.

[0018] The viscosity of the non-aqueous composition of this embodiment is preferably 50 mPa·s or more but less than 5000 mPa·s, preferably 100 mPa·s or more but less than 3000 mPa·s, more preferably 150 mPa·s or more but less than 1000 mPa·s, even more preferably 200 mPa·s or more but less than 800 mPa·s, and even more preferably 200 mPa·s or more but less than 600 mPa·s. A viscosity of 50 mPa·s or more is suitable for protecting the skin or hair from UV rays and for ease of handling when applying the non-aqueous composition of this embodiment by hand, while a viscosity of less than 5000 mPa·s is suitable for penetration into the interior of the hair.

[0019] The viscosity of the non-aqueous composition of the present embodiment is measured using a rheometer (for example, a rheometer "Rheo Stress 6000 (trade name)" manufactured by HAAKE), at a measurement temperature of 25°C, a diameter of a cone-plate sensor of 35 mm, an inclination angle of the cone-plate sensor of 2°, and a shear rate dγ / dt of 36 s -1 This is a value measured in a steady flow curve mode under the conditions.

[0020] If it is necessary to increase the viscosity of the non-aqueous composition of this embodiment, it is advisable to use a common method for increasing viscosity. For example, to increase the viscosity by adding a component (for convenience, this component will be referred to as the "additional component"), a component with a higher viscosity than the composition before the addition of the component is used as the additional component. The additional component is not limited to a single component such as ester oil, but also includes a multi-component component such as a decamethylcyclopentasiloxane solution of a highly polymerized methylpolysiloxane or an isododecane solution of a highly polymerized methylpolysiloxane.

[0021] The ultraviolet absorber blended in the non-aqueous composition of the present embodiment is a known one, and examples thereof include benzoate ester-based ultraviolet absorbers (2-[4-(diethylamino)-2-hydroxybenzoyl]benzoic acid hexyl ester, para-aminobenzoic acid, ethyl para-aminobenzoate, glyceryl para-aminobenzoate, amyl para-dimethylaminobenzoate, ethyl 4-[N,N-di(2-hydroxypropyl)amino]benzoate, etc.), salicylic acid-based ultraviolet absorbers (ethylene glycol salicylate, 2-ethylhexyl salicylate, homomenthyl salicylate, etc.), cinnamic acid-based ultraviolet absorbers (2-ethylhexyl para-methoxycinnamate, glyceryl di-para-methoxycinnamate mono-2-ethylhexanoate, isopropyl para-methoxycinnamate, 2-ethylhexyl para-methoxycinnamate, diisopropyl cinnamate, etc.), benzophenone-based ultraviolet absorbers (dihydroxydimethoxybenzophenone, di ... Examples of suitable hydroxybenzophenones include sodium hydroxydimethoxybenzophenone disulfonate, dihydroxybenzophenone, tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, hydroxymethoxybenzophenone sulfonic acid, hydroxymethoxybenzophenone sulfonic acid, and sodium hydroxymethoxybenzophenone sulfonate, 2-cyano-3,3-diphenylprop-2-enoic acid 2-ethylhexyl ester, menthyl anthranilate, terephthalylidene dicamphorsulfonic acid, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, bisethylhexyloxyphenol methoxyphenyl triazine, 4-tert-butyl-4'-methoxy-dibenzoylmethane, and 2,2'-methylenebis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol).

[0022] The non-aqueous composition of this embodiment contains one or more ultraviolet absorbers, and the amount of ultraviolet absorber in the non-aqueous composition of this embodiment is preferably 1.0% by mass or more but less than 30% by mass, more preferably 2.0% by mass or more but less than 25% by mass, more preferably 3.0% by mass or more but less than 20% by mass, and even more preferably 5.0% by mass or more but less than 18% by mass. A blending amount of ultraviolet absorber of 1.0% by mass or more is suitable for protecting skin or hair from ultraviolet rays, and a blending amount of less than 30% by mass is suitable for addressing cost reduction.

[0023] The liquid hydrocarbons blended in the nonaqueous composition of this embodiment are known, and examples thereof include hydrogenated polyisobutene (heavy liquid isoparaffin, light liquid isoparaffin, etc.), mineral oil, and isododecane. The nonaqueous composition of this embodiment may contain one or more liquid hydrocarbons, and the blending amount of the liquid hydrocarbons in the nonaqueous composition of this embodiment is, for example, 10% by mass or more and less than 90% by mass.

[0024] When volatility is required for the liquid hydrocarbon, as with the volatile cyclic silicone, a volatile hydrocarbon is blended into the non-aqueous composition of this embodiment as the liquid hydrocarbon. Volatile hydrocarbons have characteristics such as a lower latent heat of vaporization compared to water, making hair less cold, and improving the ease of running fingers through hair, making them suitable as solvents for non-aqueous compositions.

[0025] When a volatile hydrocarbon is blended into the non-aqueous composition of this embodiment, the volatile hydrocarbon may be a known volatile hydrocarbon such as light liquid isoparaffin or isododecane, and preferably has a boiling point of 260° C. or less at normal pressure. Furthermore, even if the volatile hydrocarbon to be blended has a lower kinematic viscosity than decamethylcyclopentasiloxane, increasing the viscosity of the non-aqueous composition of this embodiment makes it possible to suppress or improve a decrease in PA, etc. (Here, kinematic viscosity is a value measured according to JIS K-2283.)

[0026] The non-aqueous composition of this embodiment contains one or more volatile hydrocarbons, and the amount of volatile hydrocarbons in the non-aqueous composition is preferably 20% by mass or more but less than 90% by mass, preferably 30% by mass or more, more preferably 45% by mass or more, even more preferably 60% by mass or more, and even more preferably 70% by mass or more. A blending amount of 20% by mass or more is suitable for reducing the amount of volatile cyclic silicone used, the supply of which is a concern.

[0027] The non-aqueous composition of the present embodiment contains a volatile linear silicone (kinematic viscosity at 25°C of 2 mm 2 Known volatile silicones such as volatile cyclic silicones (those with a viscosity of about / s or less), volatile cyclic silicones (octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, etc.), and trimethicone may be blended. One or more types of volatile silicones may be blended, and the blending amount of the volatile silicone in the non-aqueous composition of this embodiment is, for example, 5% by mass or more and less than 30% by mass.

[0028] From the viewpoint of reducing the amount of volatile cyclic silicone used, the nonaqueous composition of this embodiment preferably contains a larger amount of liquid hydrocarbon than volatile cyclic silicone, and more preferably does not contain any volatile cyclic silicone.

[0029] In addition to the components described above, the non-aqueous composition of this embodiment can optionally contain known cosmetic ingredients depending on the intended use of the composition. Examples of the ingredients that can be optionally contained include nonionic surfactants, cationic surfactants, anionic surfactants, amphoteric surfactants, higher alcohols, hydrocarbons, waxes, ester oils, vegetable oils, silicones, polymeric compounds, humectants, preservatives, chelating agents, fragrances, and colorants.

[0030] The non-aqueous composition of the present embodiment is for skin or hair, and is preferably applied to the skin or hair to reduce the effects of ultraviolet rays. For example, when treating hair with the non-aqueous composition of the present embodiment, the non-aqueous composition may be in a liquid form, sprayed onto the hair or applied by hand, and then dried with warm air as needed, without being rinsed off. [Example]

[0031] The present invention will be described in detail below based on examples, but the present invention should not be construed as being limited by the descriptions of these examples.

[0032] Non-aqueous compositions of Examples, Comparative Examples, and Reference Examples were prepared, and their viscosity, SPF, and UVAPF were measured.

[0033] (Non-aqueous composition) The non-aqueous compositions of Examples, Comparative Examples, and Reference Examples were prepared by mixing 2-cyano-3,3-diphenylprop-2-enoic acid 2-ethylhexyl ester, 4-tert-butyl-4'-methoxydibenzoylmethane, bisethylhexyloxyphenol methoxyphenyl triazine, 2-ethylhexyl paramethoxycinnamate, 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoic acid hexyl ester, 2-ethylhexyl isononanoate, dicaprylyl carbonate, and dimer dilinoleic acid. Mixture of dimer dilinoleyl, highly polymerized methylpolysiloxane, and decamethylcyclopentasiloxane (viscosity measured 60 seconds after the start of measurement using a Brookfield viscometer at 25°C and a rotor rotation speed of 60 rpm: 5000 mPa·s), mixture of highly polymerized methylpolysiloxane and isododecane (viscosity measured 60 seconds after the start of measurement using a Brookfield viscometer at 25°C and a rotor rotation speed of 60 rpm: 2700 mPa·s), heavy liquid isoparaffin, and isododecane (kinematic viscosity at 37.8°C: 1.35 mm 2 The details of the blended components and their blending amounts (blending amount unit: parts by mass) are shown in Tables 1 to 5.

[0034] (viscosity) The viscosity of each non-aqueous composition was measured using a rheometer "Rheo Stress 6000" manufactured by HAAKE, at a measurement temperature of 25°C, a diameter of the cone-plate sensor of 35 mm, an inclination angle of the cone-plate sensor of 2°, and a shear rate dγ / dt of 36 s. -1 The measurement was carried out under the following conditions.

[0035] (SPF, UVA / SPF) For each non-aqueous composition, SPF and UVAPF (an index for determining the UVAPF:PA level) measurements were performed using an in vitro test method, with 0.0325 g of the non-aqueous composition applied to a Helioscreen "HELIOPLATE" and Labsphere's "UV2000S" SPF analyzer.

[0036] Table 1 below shows the ingredients, their amounts, viscosity, SPF, and UVAPF used in Comparative Example 1a, Examples 1a-1b, and Examples 2a-2b. The SPF and UVAPF values ​​of Examples 1a-1b and 2a-2b, which contain liquid hydrocarbons (heavy liquid isoparaffin and isododecane), confirm that UV protection is possible even without reducing or eliminating the volatile cyclic silicone decamethylcyclopentasiloxane. Furthermore, a comparison between Comparative Example 1a and Examples 1a-1b, and a comparison between Examples 2a-2b, confirms that the higher the viscosity, the better the SPF or UVAPF value.

[0037] [Table 1]

[0038] Tables 2 to 5 below show the ingredients blended in each Reference Example, their blending amounts, viscosity, SPF, and UVAPF. Although the results in Tables 2 to 5 do not include blends containing liquid hydrocarbons, it can be seen that when the blended component system is the same, the higher the viscosity, the better the SPF or UVAPF value, as with the results in Table 1. In other words, regardless of whether or not liquid hydrocarbons are blended, there is a relationship between viscosity and SPF or UVAPF.

[0039] Table 2

[0040] Table 3

[0041] Table 4

[0042] Table 5

Claims

1. A non-aqueous composition for skin or hair containing an ultraviolet absorber and a liquid hydrocarbon.

2. 2. The non-aqueous composition according to claim 1, having a viscosity of 50 mPa·s or more.

3. 3. The non-aqueous composition according to claim 1, wherein the liquid hydrocarbon is a volatile hydrocarbon, and the amount of the volatile hydrocarbon is 20% by mass or more.

4. The non-aqueous composition according to claim 3 , wherein the blending amount of the volatile hydrocarbon is 30% by mass or more.

5. 5. The non-aqueous composition according to claim 3, wherein the volatile hydrocarbon has a kinematic viscosity lower than that of decamethylcyclopentasiloxane.

6. 6. The non-aqueous composition according to claim 1, wherein the ultraviolet absorber is contained in an amount of 1.0% by mass or more.

7. 7. The non-aqueous composition according to any one of claims 1 to 6, wherein the non-aqueous composition is free of volatile cyclic silicone or contains a larger amount of the liquid hydrocarbon than the volatile cyclic silicone.

8. A hair treatment method, comprising using the non-aqueous composition according to any one of claims 1 to 7.

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