Water-in-oil cosmetic

Abstract

This invention provides a water-in-oil cosmetic that achieves both high deodorizing effect and excellent feeling of use. A water-in-oil cosmetic according to the present invention contains (A) a deodorant agent selected from the group consisting of a bactericide and an antiperspirant, (B) a polyether-modified silicone, (C) silicone oil, and (D) water, wherein the content of the component (D) is 55% by mass or more based on the total mass of the cosmetic.

Description

Water-in-oil cosmetics

[0001] The present invention relates to a water-in-oil cosmetic that exhibits an excellent deodorizing effect against body odor.

[0002] In the past, salt-type deodorants have been widely used in skin care cosmetics to prevent body odors such as axillary odor. However, salt-type deodorants tend to significantly reduce the viscosity of general emulsions and the like. For this reason, it has been difficult to combine a deodorant with an emulsion cosmetic to impart both relatively high viscosity and deodorizing effects.

[0003] Furthermore, in general water-in-oil cosmetic compositions, the continuous phase is an oil phase and the internal aqueous phase ratio is low, and even when a deodorant agent is combined with such a water-in-oil cosmetic composition, stickiness occurs, resulting in an unsatisfactory feel when used.

[0004] International Patent Publication No. 2016 / 052277

[0005] In view of the above problems, the present invention aims to provide a water-in-oil cosmetic containing a deodorant agent that can achieve a high deodorizing effect and excellent usability.

[0006] According to the present invention, the following inventions are provided. [1] A water-in-oil cosmetic comprising: (A) a deodorant agent selected from the group consisting of disinfectants and antiperspirants, (B) a polyether-modified silicone, (C) a silicone oil, and (D) water, wherein the content of component (D) is 55 mass% or more based on the total mass of the cosmetic. [2] The cosmetic according to [1], wherein component (A) is selected from the group consisting of o-cymen-5-ol, benzalkonium chloride, zinc phenolsulfonate, and glycyrrhetinic acid. [3] The cosmetic according to [1] or [2], wherein component (A) is zinc phenolsulfonate or glycyrrhetinic acid. [4] The cosmetic according to [1] or [2], wherein component (B) is a compound represented by the following formula (b): [Wherein, A represents a methyl group, a phenyl group, and a group represented by the formula: -C ３ H ６ O (C ２ H ４ O) ｐ (C３ H ６ O) ｑ R' (wherein R' is a hydrogen atom, an acyl group, and C １－４ alkyl groups, p is an integer of 5 to 50, q is an integer of 5 to 50, and the repeating unit (C ２ H ４ O) and (C ３ H ６ R) is a group selected from the group consisting of polyoxyalkylene groups represented by the following formula: ｂ is a methyl group or a phenyl group, m is an integer of 50 to 1000, n is an integer of 1 to 40, and the repeating unit (SiR ｂ ２ O) and (SiR ｂ The cosmetic preparation according to any one of [1] to [3], wherein the polyether-modified silicone is represented by the formula (A) and has a weight-average molecular weight of 30,000 or more, and the polyoxyalkylene groups (AO) may be arranged randomly or in block form, and the content of polyoxyalkylene groups in the polyether-modified silicone is 40% by mass or more. [5] The cosmetic preparation according to any one of [1] to [4], wherein, based on the total mass of the cosmetic preparation, the content of component (A) is 0.01 to 1% by mass, the content of component (B) is 0.3 to 5% by mass, and the content of component (C) is 5 to 20% by mass. [6] The cosmetic preparation according to any one of [1] to [5], further comprising (E) a polyhydric alcohol. [7] The cosmetic preparation according to [6], wherein the content of component (E) is 10 to 20% by mass, based on the total mass of the cosmetic preparation. [8] The cosmetic according to [6] or [7], wherein the ratio of the total mass of component (E) to the total mass of liquid oil contained in the cosmetic is 0.6 to 2. [9] The cosmetic according to any one of [1] to [8], wherein the viscosity measured at 30°C using a Brookfield type rotational viscometer is 10,000 to 40,000 mPa s.

[0007] The present invention provides a water-in-oil cosmetic that combines a deodorizing effect with a pleasant feel in use. This cosmetic is capable of achieving a deodorizing effect through its high bactericidal and antiperspirant effects, and also has sufficient viscosity. Specific Description of the Invention

[0008] The water-in-oil cosmetic composition according to the present invention (hereinafter simply referred to as "cosmetic composition") comprises: (A) a deodorant agent, (B) a polyether-modified silicone, (C) a silicone oil, and (D) water. Each of these components, as well as further components that may be blended, are described below.

[0009] (A) Deodorant Agent The cosmetic preparation according to the present invention comprises a deodorant agent (hereinafter, sometimes referred to as component (A)). This deodorant agent is selected from the group consisting of bactericides and antiperspirants, and can be selected from bactericides and antiperspirants commonly used in the fields of cosmetics and pharmaceuticals.

[0010] Examples of disinfectants include benzalkonium chloride, glycyrrhetinic acid, o-cymen-5-ol (isopropylmethylphenol), triclosan, 3,4,4-trichlorocarbanilide, triethyl citrate, benzalkonium chloride, benzothonium chloride, alkyltrimethylammonium chloride, resorcinol, phenol, sorbic acid, salicylic acid, hexachlorophene, chlorhexidine gluconate, chlorhexidine hydrochloride, silver-supported zeolite, and silver-supported silica.

[0011] Examples of antiperspirants include zinc phenolsulfonate, chlorohydroxyaluminum, zinc phenolsulfonate, aluminum hydrochloride, aluminum chloride, aluminum sulfate, aluminum citrate, aluminum acetate, basic aluminum chloride, aluminum phenolsulfonate, aluminum β-naphthol disulfonate, sodium perborate, aluminum zirconium octachlorohydrate, aluminum zirconium pentachlorohydrate, aluminum zirconium tetrachlorohydrate, aluminum zirconium trichlorohydrate, zirconium chlorohydrate, aluminum potassium sulfate, allantoin chlorohydroxyaluminum, basic aluminum bromide, aluminum naphthalene sulfonic acid, basic aluminum iodide, and zinc oxide.

[0012] Of the above-mentioned disinfectants and antiperspirants, those preferably used as component (A) are those selected from the group consisting of o-cymen-5-ol (a-1), benzalkonium chloride (a-2), zinc phenolsulfonate (a-3), and glycyrrhetinic acid (a-4), which are represented by the following formulas:

[0013] In the present invention, it is particularly preferable to select zinc phenolsulfonate salt (a-3) or glycyrrhetinic acid (a-4) as component (A).

[0014] The content of component (A) can be selected arbitrarily depending on the purpose, but in order to achieve a sufficient deodorizing effect, it is preferably 0.01 to 1 mass % based on the total mass of the cosmetic, and more preferably 0.05 to 0.7 mass %.

[0015] (B) Polyether-Modified Silicone The cosmetic of the present invention comprises a polyether-modified silicone (hereinafter sometimes referred to as component (B)). This component (B) functions as a surfactant when the cosmetic of the present invention is made into a water-in-oil cosmetic. Component (B) is generally a silicone surfactant, which is formed with a polyether group, and various types are known, but any one suitable for use in cosmetics can be selected and used. Furthermore, the molecular weight of such polyether-modified silicone is not necessarily limited, but a polyether-modified silicone with a mass-average molecular weight of 30,000 or more is preferred.

[0016] Various types of such polyether-modified silicones are known, but for example, those represented by the following formula (b) are preferred. [Wherein, A represents a methyl group, a phenyl group, and a group represented by the formula: -C ３ H ６ O (C ２ H ４ O) ｐ (C ３ H ６ O) ｑ R' (wherein R' is a hydrogen atom, an acyl group, and C １－４ alkyl groups, p is an integer of 5 to 50, q is an integer of 5 to 50, and the repeating unit (C ２ H ４ O) and (C ３ H ６ R) is a group selected from the group consisting of polyoxyalkylene groups represented by the following formula: ｂ is a methyl group or a phenyl group, m is an integer of 50 to 1000, n is an integer of 1 to 40, and the repeating unit (SiR ｂ ２ O) and (SiR ｂ AO) may be arranged randomly or in blocks, and the content of polyoxyalkylene groups in the polyether-modified silicone is 40 mass% or more.

[0017] Here, the weight average molecular weight of the polyether-modified silicone represented by formula (b) is preferably 30,000 or more.

[0018] More specific examples of component (B) include, but are not limited to, PEG-9 polydimethylsiloxyethyl dimethicone, PEG / PPG-19 / 19 dimethicone, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, cetyl PEG / PPG-10 / 1 dimethicone, PEG-9 methyl ether dimethicone, PEG-10 dimethicone, PEG-3 dimethicone, and the like.

[0019] The content of component (B) is selected so that each component can be sufficiently dispersed and an emulsified state can be maintained, and is preferably 0.3 to 5% by mass, and more preferably 0.5 to 3% by mass, based on the total mass of the cosmetic.

[0020] (C) Silicone Oil The cosmetic composition according to the present invention contains silicone oil (hereinafter sometimes referred to as component (C)). Component (C) constitutes the main component of the oil phase in the water-in-oil cosmetic composition according to the present invention. Silicone oil is preferably used in various cosmetic compositions because it spreads easily and provides a refreshing feel when used in cosmetics. However, in water-in-oil cosmetic compositions, silicone oil tends to reduce stability. However, in the present invention, sufficient stability is achieved by combining it with component (B).

[0021] In the present invention, the silicone oil can be selected depending on the purpose from those commonly used in cosmetic applications, and examples thereof include linear silicone oils such as dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, and methylhydrogenpolysiloxane; and cyclic silicone oils such as dodecamethylcyclohexasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and tetramethyltetrahydrogenpolysiloxane.

[0022] In the cosmetic according to the present invention, the content of component (C) is preferably 5 to 20% by mass, and more preferably 7 to 15% by mass, based on the total mass of the cosmetic.

[0023] (D) Water The oil-in-water cosmetic according to the present invention comprises an aqueous phase and an oil phase. The aqueous phase contains water (hereinafter, for simplicity, sometimes referred to as component (D)). As the water, water generally used in cosmetics can be used, such as purified water, ion-exchanged water, tap water, etc.

[0024] In the present invention, by adopting a combination of components (A) and (B), it is possible to achieve a high content of component (D), thereby further improving the feel during use. Specifically, the content of component (D) is 55% by mass or more, and preferably 60% by mass or more, based on the total mass of the cosmetic.

[0025] (E) Polyhydric Alcohol The present invention may contain a polyhydric alcohol in addition to the above-mentioned components. Since the cosmetic preparation according to the present invention is suitable for use in skin care applications, it preferably contains a polyhydric alcohol capable of achieving a moisturizing effect. As the polyhydric alcohol, dihydric alcohols such as ethylene glycol, propylene glycol, and 1,3-butylene glycol, trihydric alcohols such as glycerin, and tetrahydric or higher alcohols can be used. Of these, it is preferable that the cosmetic preparation according to the present invention contains glycerin. Polyethylene glycol can also be used as the polyhydric alcohol. Furthermore, it is preferable that the cosmetic preparation further contains, in addition to glycerin, at least one selected from the group consisting of polyethylene glycol, 1,3-butylene glycol, and dipropylene glycol in combination.

[0026] In the cosmetic according to the present invention, when contained, the content of component (E) is preferably 10 to 20% by mass based on the total mass of the cosmetic.

[0027] Furthermore, because the cosmetic composition according to the present invention contains a small amount of liquid oil, the dispersion state may be affected by the hydrophilic polyhydric alcohol. Therefore, in order to maintain a stable dispersion state, it is preferable that the ratio of the total mass of component (E) to the total mass of liquid oil contained in the cosmetic composition according to the present invention is 0.6 to 2. In this case, the liquid oil may include oils other than silicone oil in addition to component (C).

[0028] In addition to the above-mentioned components, the cosmetic according to the present invention may contain other components used in cosmetics as needed, as long as the effects of the present invention are not impaired, such as powder components, water-soluble components, liquid oils and fats, solid oils and fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, ester oils, anionic surfactants, surfactants other than component (B), moisturizers other than component (E), water-soluble polymers, thickeners, film-forming agents, ultraviolet absorbers, sequestering agents, sugars, amino acids, organic amines, polymer emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant aids, fragrances, etc.

[0029] When applied to the skin, the cosmetic composition according to the present invention preferably remains on the skin for a relatively long period of time. Therefore, it is preferable that the viscosity is relatively high. Specifically, the viscosity is preferably 10,000 to 40,000 mPa s. Here, the viscosity can be measured using a Brookfield type rotational viscometer with a spindle number of 6, a rotation speed of 10 rpm, and at 30°C.

[0030] [Examples 1 to 10 and Comparative Examples 1 to 3] Water-in-oil cosmetics were prepared by blending the components as shown in Table 1. The obtained cosmetics were evaluated by a specialist panel (N=5) as follows.

[0031] Deodorizing effect The cosmetic compositions of each example obtained were applied to the skin, and after 4 hours in daily life, the deodorizing effect was evaluated on a 5-point scale from A (clear deodorizing effect felt) to E (no deodorizing effect felt at all).

[0032] Antiperspirant Effect The obtained cosmetic compositions of each example were applied to the skin, and after 4 hours in daily life, the antiperspirant effect was evaluated on a 5-point scale from A (clear antiperspirant effect felt) to E (no antiperspirant effect felt at all).

[0033] Makeup Staining First, a base cosmetic was applied to the surface of the skin, and then the obtained cosmetic of each example was applied to the skin on top of that. After 4 hours under normal daily conditions, the effectiveness of preventing makeup from staining was evaluated on a 5-point scale from A (clear effect in preventing makeup from staining) to E (no effect at all in preventing makeup from staining).

[0034] Stickiness The cosmetic compositions of each example obtained were applied to the skin, and immediately after application, the effectiveness of suppressing stickiness was evaluated on a five-point scale from A (stickiness suppression effect felt) to E (stickiness suppression effect not felt).

Claims

1. A water-in-oil cosmetic comprising: (A) a deodorant agent selected from the group consisting of bactericides and antiperspirants; (B) a polyether-modified silicone; (C) a silicone oil; and (D) water, wherein the content of component (D) is 55% by mass or more based on the total mass of the cosmetic.

2. The cosmetic preparation according to claim 1, wherein component (A) is selected from the group consisting of o-cymen-5-ol, benzalkonium chloride, zinc phenolsulfonate, and glycyrrhetinic acid.

3. The cosmetic preparation according to claim 1 or 2, wherein component (A) is zinc phenolsulfonate or glycyrrhetinic acid.

4. The component (B) is represented by the following formula (b): [Wherein, A is a methyl group, a phenyl group, and a group represented by the formula: ３ H ６ O (C ２ H ４ O) ｐ (C ３ H ６ O) ｑ R' (wherein R' is a hydrogen atom, an acyl group, or C １－４ alkyl groups, p is an integer of 5 to 50, q is an integer of 5 to 50, and ２ H ４ O) and (C ３ H ６ R is a group selected from the group consisting of polyoxyalkylene groups represented by the following formula (1), which may be arranged randomly or in the form of blocks: ｂ is a methyl group or a phenyl group, m is an integer of 50 to 1000, n is an integer of 1 to 40, and the repeating unit (SiR ｂ ２ O) and (SiR ｂ AO) may be arranged randomly or in blocks, and the content of polyoxyalkylene groups in the polyether-modified silicone is 40 mass% or more] and has a weight average molecular weight of 30,000 or more.

5. The cosmetic according to claim 1 or 2, wherein, based on the total mass of the cosmetic, the content of component (A) is 0.01 to 1 mass%, the content of component (B) is 0.3 to 5 mass%, and the content of component (C) is 5 to 20 mass%.

6. The cosmetic preparation according to claim 1 or 2, further comprising (E) a polyhydric alcohol.

7. The cosmetic according to claim 6, wherein the content of component (E) is 10 to 20 mass % based on the total mass of the cosmetic.

8. The cosmetic according to claim 6, wherein the ratio of the total mass of component (E) to the total mass of liquid oil contained in said cosmetic is 0.6 to 2.

9. The cosmetic preparation according to claim 1 or 2, which has a viscosity of 10,000 to 40,000 mPa·s as measured at 30° C. using a B-type rotational viscometer.

Images