KR20190131588A - Oil type skin cosmetic - Google Patents

Abstract

The present invention provides an oil selected from the group consisting of cholesterol fatty acid esters, cholestanol fatty acid esters, phytosterol fatty acid esters and phytostanol fatty acid esters, and components selected from the group consisting of ultraviolet absorbers; Nonionic surfactants having a polyoxyethylene chain having an HLB of 14.5 to 20.0; Polymers including a structural unit derived from acryloyldimethyltaurine acid salt; And it relates to an oil-in-water type skin cosmetic containing water. According to the present invention, an oil-in-water type skin cosmetic having excellent stability and excellent water resistance and usability is provided.

Description

Oil type skin cosmetic

The present invention relates to an oil-in-water type skin cosmetic.

Background Art Conventionally, skin cosmetics containing ultraviolet scatterers and ultraviolet absorbers have been known for the purpose of the sunblock effect. Among these, oil-in-water type skin cosmetics are preferably used in view of having a fresh feeling of use. It is preferable to mix | blend an ultraviolet absorber with the said skin cosmetics especially in order to improve the protective effect from the ultraviolet-ray of an optical wavelength range.

However, the ultraviolet absorber is generally an oil component having a relatively high polarity. When the UV absorber is blended, the particle size of the emulsified particles is increased, and the coalescence of the emulsified particles is easily progressed over time, and the storage stability of the skin cosmetic is improved. The problem of falling was occurring.

In order to solve the problem of the said storage stability, it is known to mix | blend a comparatively high HLB hydrophilic surfactant (patent document 1 and patent document 2). However, when using the surfactant of about HLB12, there exists a problem that water resistance falls and a ultraviolet absorber tends to flow in water, sweat, etc. easily. Moreover, when only the high surfactant of HLB 14.5 or more with high HLB is used, since the hydrophilicity of surfactant is too high, for example, surfactant does not orientate in an oil-water interface, and it is a water phase. ), Micelles were formed, and as a result, emulsification power was lowered, resulting in easier coalescence of emulsified particles, resulting in a decrease in stability.

On the other hand, conventionally, the oil-in-water emulsion type composition containing high polar oil has been used as skin cosmetics (patent document 3). Of high polar oils, ester oils having a sterol skeleton have a high skin care effect, and thus skin cosmetics containing such ester oils are required.

However, since ester oils having a sterol skeleton are relatively high in polarity, when these compounds are blended, the particle size of the emulsified particles becomes large, and the coalescence of the emulsified particles tends to proceed with time, resulting in a problem that the storage stability of the skin cosmetic is lowered. there was.

Japanese Patent Application Laid-Open No. 2016-190797 Japanese Patent Application Laid-Open No. 2016-041665 Japanese Patent Application Laid-Open No. 2004-307353

The subject of this invention is providing the oil-in-water type skin cosmetic which is excellent in stability even if it contains the ultraviolet absorber, and also excellent in water resistance. Moreover, the subject of this invention is providing the oil-in-water type skin cosmetic which is excellent in stability, and also excellent in usability, even if it contains the ester oil which has a sterol skeleton.

This invention contains following component A, following component B, following component C, and following component D, and content of the said component B is 1.0-4.0 mass%,

It relates to an oil-in-water type skin cosmetic containing no nonionic surfactant having a HLB of not less than 7.0 and less than 14.5 or 0.1 mass% or less of a nonionic surfactant having an HLB of not less than 7.0 and less than 14.5:

Component A: Component selected from the group consisting of Component A1 and Component A2

  Component A1: UV Absorber

  Component A2: an emulsion selected from the group consisting of cholesterol fatty acid esters, cholestanol fatty acid esters, phytosterol fatty acid esters and phytostanol fatty acid esters

Component B: Nonionic Surfactant with Polyoxyethylene Chain, HLB is 14.5-20.0

Component C: Polymer selected from the group consisting of Component C1, Component C2 and Component C3

  Component C1: A polymer comprising a structural unit derived from acryloyldimethyltaurate

  Component C2: The polymer containing the structural unit derived from the (meth) acrylic acid and / or the (meth) acrylic-acid alkylester, and the structural unit derived from the (meth) acrylic-acid polyoxyethylene alkyl ether at least.

  Component C3: Alkyl Modified Carboxyvinyl Polymer

Component D: Water.

Although the oil-in-water type skin cosmetic of the present invention contains the ultraviolet absorbent of component A1, the oil-in-water type skin cosmetic exhibits an effect of excellent stability and excellent water resistance. In addition, the oil-in-water type skin cosmetic of the present invention exhibits an effect of excellent stability and excellent usability even though it contains an ester oil having a sterol skeleton of component A2.

The oil-in-water skin cosmetic of the present invention is an oil-in-water (O / W) type emulsion composition. The oil-in-water type skin cosmetic of the present invention comprises a component selected from the group consisting of an oil agent selected from the group consisting of cholesterol fatty acid esters, cholestanol fatty acid esters, phytosterol fatty acid esters and phytostanol fatty acid esters, and ultraviolet absorbers; Nonionic surfactants having a polyoxyethylene chain having an HLB of 14.5 to 20.0; The structural unit derived from the polymer containing the structural unit derived from acryloyl dimethyl taurate, the (meth) acrylic acid, and / or the (meth) acrylic-acid alkylester, and the structural unit derived from the (meth) acrylic-acid polyoxyethylene alkyl ether A polymer selected from the group consisting of at least a polymer and an alkyl-modified carboxyvinyl polymer; Water is included as an essential ingredient. In the present specification, a component selected from the group consisting of the cholesterol fatty acid ester, the cholestanol fatty acid ester, the phytosterol fatty acid ester and the phytostanol fatty acid ester, and the ultraviolet absorber is selected from the group consisting of "component A" and the HLB The nonionic surfactant which has a polyoxyethylene chain which is 14.5-20.0 is a "component B", the polymer containing the structural unit derived from the said acryloyl dimethyl taurate salt, (meth) acrylic acid, and / or alkyl (meth) acrylic acid A polymer selected from the group consisting of a polymer comprising at least a structural unit derived from an ester, a structural unit derived from a (meth) acrylic acid polyoxyethylene alkyl ether, and an alkyl-modified carboxyvinyl polymer is referred to as "component C" and said water as "component." I may call each "D" . The ultraviolet absorbent may be selected from the group consisting of "component A1", said cholesterol fatty acid ester, cholestanol fatty acid ester, phytosterol fatty acid ester, and phytostanol fatty acid ester, with "component A2" and said acryloyldimethyl taurate salt. The structural unit derived from the "component C1", the structural unit derived from the said (meth) acrylic acid, and / or (meth) acrylic-acid alkylester, and the (meth) acrylic-acid polyoxyethylene alkyl ether are used for the polymer containing the structural unit derived from the "Component C2" and the alkyl-modified carboxyvinyl polymer may be called "component C3", respectively, at least the polymer containing. That is, the oil-in-water type skin cosmetic of the present invention contains component A, component B, component C and component D as essential components. Component A is a component selected from the group consisting of component A1 and component A2. Component C is a polymer selected from the group consisting of component C1, component C2 and component C3.

In one embodiment, the oil-in-water type skin cosmetic of the present invention preferably further contains zinc oxide. In this specification, the said zinc oxide may be called "component E." Moreover, it is preferable that the oil-in-water type skin cosmetic of this invention contains the dimethyl polysiloxane whose kinematic viscosity in 25 degreeC is 1.5-10.0mm <2> / s further. In this specification, the dimethyl polysiloxane whose dynamic viscosity in said 25 degreeC is 1.5-10.0mm <2> / s may be called "component F."

The oil-in-water type skin cosmetic of the present invention may contain components other than the components A to F. Component A, component B, component C, component D, component E, component F, and components other than components A-F may use only 1 type, respectively, and may use 2 or more types.

Component A is a component selected from the group consisting of component A1 and component A2. Only 1 type may be used for component A, and 2 or more types may be used for it. The component A may include only the component A1, may include only the component A2, and may include the component A1 and the component A2. Moreover, also about each of component A1 and component A2, only 1 type may be used and 2 or more types may be used.

Component A1 is a ultraviolet absorber. By mix | blending component A1, the ultraviolet-ray protective effect of oil-in-water type skin cosmetics is acquired, especially the protective effect from the ultraviolet-ray of light wavelength range improves. Only 1 type may be used for component A1, and 2 or more types may be used for it.

As the component A1, for example, paramethoxy cinnamic acid 2-ethylhexyl, diethylaminohydroxybenzoyl benzoic acid hexyl benzoate, bisethylhexyloxyphenol methoxyphenyl triazine, 4-tert-butyl-4'-methoxydibenzoyl Methane, 2-hydroxy-4-methoxy benzophenone (oxybenzone-3), etc. are mentioned. In combination with paramethoxy cinnamic acid 2-ethylhexyl, diethylaminohydroxybenzoyl benzoic acid hexyl and bisethylhexyloxyphenol methoxyphenyl triazine from the viewpoint of enhancing the ultraviolet protective effect, and particularly the protective effect against ultraviolet rays in the light wavelength range. It is desirable to.

Component A2 is an emulsion selected from the group consisting of cholesterol fatty acid esters, cholestanol fatty acid esters, phytosterol fatty acid esters and phytostanol fatty acid esters. Since component A2 is an lipid-like component between cells, it is known to have a skin care effect such as increasing the barrier function of the skin, suppressing evaporation of water from inside the skin, and enhancing moisturizing power. Only 1 type may be used for component A2, and 2 or more types may be used for it.

As component A2, macadamia nut fatty acid phytosteryl, macadamia nut fatty acid cholesteryl, oleic acid phytosteryl, isostearic acid phytosteryl, etc. are mentioned, for example. Among these, macadamia nut fatty acid phytosteril and macadamia nut fatty acid cholesteryl are preferable from a viewpoint of a skin care effect.

Content of the component A in 100 mass% of oil-in-water type skin cosmetics of this invention is 5.0 mass% or more from a viewpoint which raises the ultraviolet-ray protective effect, or the effect which the effect of stability improvement by this invention is remarkably exhibited, Preferably More preferably, it is 8.0 mass% or more, More preferably, it is 10.0 mass% or more, On the other hand, It is 30.0 mass% or less from a viewpoint of restraining stickiness, ensuring a fresh usability, or forming a stable emulsion system. More preferably, it is 25.0 mass% or less, More preferably, it is 20.0 mass% or less, More preferably, it is 17.0 mass% or less. Content of component A is the total amount of all the component A contained in the oil-in-water type skin cosmetic of this invention.

Component A may be component A1, or component A2 may be sufficient as it. When component A is component A1, content of component A1 in 100 mass% of oil-in-water type skin cosmetics of this invention becomes like this. Preferably it is 5.0 mass% or more, More preferably, 8.0 mass% or more from a viewpoint of improving an ultraviolet protective effect. More preferably, it is 10.0 mass% or more, On the other hand, From a viewpoint of suppressing stickiness and ensuring a refreshing feeling, Preferably it is 25.0 mass% or less, More preferably, it is 20.0 mass% or less, More preferably, it is 17.0 It is mass% or less. In addition, when component A is component A2, content of component A2 in the 100 mass% of oil-in-water type skin cosmetics of this invention is 5.0 mass% or more from a viewpoint that the effect of stability improvement by this invention is exhibited remarkably. More preferably, it is 8.0 mass% or more, More preferably, it is 10.0 mass% or more, On the other hand, From a viewpoint of forming a stable emulsion system, Preferably it is 30.0 mass% or less, More preferably, it is 25.0 mass% or less More preferably, it is 20.0 mass% or less.

Component B is a nonionic surfactant having a polyoxyethylene chain having an HLB of 14.5 to 20.0. It is one of the characteristics of this invention to improve stability, using the component B which is a specific nonionic surfactant, suppressing the stickiness at the time of use of an oil-in-water type skin cosmetic. Moreover, as a component which becomes especially effective when component A contains component A1, it is one of the characteristics of this invention to further improve water resistance. For example, known polyglycerol-based nonionic surfactants have a bulky (high volume) hydrophilic group, which increases the curvature of the oil-water interface, so that an oily component that can be introduced into the micelle is reduced. For this reason, in order to exhibit sufficient emulsifying power, it is necessary to increase the compounding quantity of such a nonionic surfactant, and as a result, the cosmetics obtained are very sticky and lose the neat feeling of use. Only 1 type may be used for component B, and 2 or more types may be used for it.

The HLB (Hydrophile-Lipophile Balance) of the component B is 14.5 or more from a viewpoint of preventing the water resistance fall of the oil-in-water type skin cosmetic, On the other hand, it is 20.0 or less from a viewpoint of further improving the stability of an oil-in-water type skin cosmetic. Preferably it is 19.5 or less, More preferably, it is 17.0 or less. In addition, unless otherwise indicated, HLB of each component in this specification can be calculated | required by the Griffin method.

As component B, For example, Polyoxyethylene hardened castor oil whose average added mole number (E.O.) of oxyethylene is 80-100; Polyoxyethylene sorbitan fatty acid esters having an average added mole number of oxyethylene of 20 to 160 and a carbon number of fatty acids of 12 to 18; The average added mole number of oxyethylene is 20-160, The polyoxyethylene fatty acid ester etc. whose carbon number of fatty acids is 12-18 are mentioned.

More specifically, as component B, for example, monoisostearic acid polyoxyethylene sorbitan (EO20) (HLB = 15.0), triisostearic acid polyoxyethylene sorbitan (EO160) (HLB = 17.9), mono Palmitic acid polyoxyethylene sorbitan (EO20) (HLB = 16.0), monolauric acid polyoxyethylene sorbitan (EO80) (HLB = 19.0), monooleic acid polyoxyethylene sorbitan (EO20) (HLB = 15.0) ), Monostearic acid polyoxyethylene sorbitan (EO20) (HLB = 14.9), polyoxyethylene hardened castor oil (EO100) (HLB = 16.5), polyoxyethylene hardened castor oil (EO80) (HLB = 15.0) And monostearic acid polyethylene glycol (EO150) (HLB = 19.4).

Content of component B in 100 mass% of oil-in-water type skin cosmetics of this invention is 1.0 mass% or more from a viewpoint of the emulsification characteristic and stability which emulsifies component A, Preferably it is 1.5 mass% or more, and suppresses stickiness It is 4.0 mass% or less, Preferably it is 3.5 mass% or less from a viewpoint of ensuring a clean usability. Content of component B is the total amount of all the component B contained in the oil-in-water type skin cosmetic of this invention.

Component C is a polymer selected from the group consisting of component C1, component C2 and component C3. In this invention, stability of the emulsified state of the oil-in-water type skin cosmetic of this invention can be improved by using the component C which is a specific polymer. Only 1 type may be used for component C, and 2 or more types may be used for it. In addition, only 1 type may be used for each of the component C1, the component C2, and the component C3, and 2 or more types may be used.

Component C1 is a polymer containing at least a structural unit (so-called monomer unit) derived from acryloyldimethyltaurine acid salt. As said acryloyl dimethyl taurate salt, sodium acryloyl dimethyl taurate etc. are mentioned. Component C1 may contain the structural unit derived from monomer components other than acryloyl dimethyl taurate. As monomer components other than acryloyl dimethyl taurine acid salt, For example, (meth) acrylic acid, such as acrylic acid; (Meth) acrylates such as sodium acrylate; Hydroxyl group-containing acrylic monomers such as hydroxyethyl acrylate; Amide group containing acrylic monomers, such as acrylic acid amide, etc. are mentioned. That is, component C1 is a polymer containing the monomer unit of acryloyl dimethyl taurate. Examples of component C1 include copolymers of acrylic acid and acryloyldimethyltaurate, copolymers of hydroxyethyl acrylate and acryloyldimethyltaurate, acrylic acid and acrylate, acrylamide and acryloyldimethyltaurate. And copolymers thereof.

As the component C1, a compound represented by an INCI name as "Sodium Acrylate / Sodium Acryloyldimethyl Taurate Copolymer" (Na / acryloyldimethyltaurine Na copolymer); The compound etc. which are represented by "Hydroxyethyl Acrylate / Sodium Acryloyldimethyl Taurate Copolymer ((hydroxyl ethyl acrylate / acryloyl dimethyl taurine Na) copolymer)" in INCI name are preferable. Among the above, (acrylic acid Na / acryloyl dimethyl taurine Na) copolymer is preferable.

As a commercial item of the component C1, For example, SIMULGEL EG (brand name, the product made by SEPPIC SA, the (acrylic acid Na / acryloyl dimethyl taurine Na) copolymer); SIMULGEL NS (brand name, the SEPPIC SA company make, (hydroxyethyl acrylate / acryloyl dimethyl taurine Na) copolymer) etc. are mentioned.

The component C2 is a structure derived from the structural unit derived from (meth) acrylic acid and / or (meth) acrylic-acid alkylester (monomer component (C2a)), and (meth) acrylic-acid polyoxyethylene alkyl ether (monomer component (C2b)). It is a polymer containing at least a unit. As a monomer component (C2b), methacrylic acid polyoxyethylene stearyl ether, methacrylic acid polyoxyethylene behenyl ether, etc. are mentioned, for example. Moreover, as for the average added mole number of oxyethylene in a monomer component (C2b), 15-30 are preferable. Only 1 type may be used for a monomer component (C2a) and a monomer component (C2b), respectively, and 2 or more types may be used for it. The component C2 may contain the structural unit derived from monomer components other than a monomer component (C2a) and a monomer component (C2b). That is, component C2 is a copolymer containing at least the monomeric unit of the monomer component (C2a) and the monomeric unit of the monomer component (C2b). As component C2, it is a copolymer of (meth) acrylic acid and / or (meth) acrylic-acid alkylester, and methacrylic acid polyoxyethylene stearyl ether, (meth) acrylic acid and / or (meth) acrylic-acid alkylester, and meta And copolymers of polyacrylic acid berylyl acrylate.

Examples of the component C2 include compounds represented by the INCI name "ACRYLATES / STEARETH-20 METHACRYLATE COPOLYMER ((acrylate / methacrylate steareth-20) copolymer)"; A compound represented by "ACRYLATES / STEARETH-20 METHACRYLATE CROSSPOLYMER ((acrylate / methacrylate steares-20) crosspolymer)"; The compound etc. which are represented by "ACRYLATES / BEHENETH-25 METHACRYLATE COPOLYMER ((acrylate / methacrylate behenes-25) copolymer)" etc. are preferable. Among the above, from the viewpoint of the stability of oil-in-water type skin cosmetics, acrylate / methacrylate steares-20) copolymer and (acrylate / methacrylate behenes-25) copolymer are preferable.

As a commercial item of the component C2, Accurin 22, Accurine 28, Accurine 88 (brand name, the Dow Chemical company make, etc.) etc. are mentioned, for example.

It is preferable that component C2 is neutralized with a basic substance, or it is used by neutralizing with a basic substance. As a basic substance in this case, For example, Alkanolamines, such as a triethanolamine and a monoethanolamine; Inorganic bases such as ammonia, sodium hydroxide and potassium hydroxide; Basic amino acids, such as arginine, etc. are mentioned. The addition amount of a basic substance is the quantity used as the fully neutralized component C2, or it is an amount sufficient to neutralize the component C2, and what is necessary is just to mix | blend suitably according to the component C2, the kind of basic substance, and the usage-amount of the component C2.

Component C3 is an alkyl modified carboxyvinyl polymer. Examples of the component C3 include compounds represented by "Acrylates / C10-30 Alkyl Acrylate Crosspolymer ((acrylate / alkyl acrylate (C10-30)) crosspolymer)" in the INCI name. In addition, component C3 is also called acrylic acid methacrylate alkyl copolymer. As a commercial item of the component C3, PEMULEN TR-1, PEMULEN TR-2, Carbopol ETD 2020, Carbopol ULTREZ 20, Carbopol ULTREZ 21 (brand name, the Nippon Lubrizol company make) etc. are mentioned, for example. .

Content of the component C in 100 mass% of oil-in-water type skin cosmetics of this invention is 0.1 mass% or more from a viewpoint of stabilizing the oil-in-water type skin cosmetic of this invention, More preferably, it is 0.2 mass% or more, From the viewpoint of suppressing the feeling of coating and ensuring a clean usability, the content is preferably 3.0% by mass or less, more preferably 1.5% by mass or less, and still more preferably 0.9% by mass or less. Content of component C is the total amount of all the component C contained in the oil-in-water type skin cosmetic of this invention.

Component D is water. Component D has a role as a medium for forming an oil-in-water type emulsion system. By making a cosmetic into an emulsifying system, a glossiness and an emollient effect are exhibited.

Content of the component D in 100 mass% of oil-in-water type skin cosmetics of this invention becomes like this. Preferably it is 30.0 mass% or more, More preferably, it is 40.0 mass% or more, From a viewpoint of containing another component, Preferably it is 90.0 mass% or less More preferably, it is 80.0 mass% or less, More preferably, it is 70.0 mass% or less.

The oil-in-water type skin cosmetic of the present invention does not contain a nonionic surfactant having an HLB of 7.0 or more and less than 14.5, or the content of a nonionic surfactant having an HLB of 7.0 or more and less than 14.5 in 100 mass% of an oil-in-water type skin cosmetic of the present invention is 0.1 mass. It is% or less. Nonionic surfactant whose said HLB is 7.0 or more and less than 14.5, Preferably it is not contained or its content is 0.08 mass% or less, More preferably, it is not contained or its content is 0.07 mass% or less. Since non-ionic surfactants with HLB of 7.0 or more and less than 14.5 have some degree of lipophilic, component A tends to flow down because water A and component A on skin become easy to re-emulsify after application of skin cosmetics. Lowers. For this reason, by making content of the said nonionic surfactant as small as possible, it becomes the thing excellent in the water resistance of an oil-in-water type skin cosmetic.

The oil-in-water type skin cosmetic of the present invention may or may not contain a nonionic surfactant having an HLB of less than 7.0. The nonionic surfactant whose HLB is less than 7.0 may be used as a dispersing agent etc., for example. In addition, nonionic surfactants having an HLB of less than 7.0 do not contribute to re-emulsification of component A because of high lipophilic properties, and do not lower the water resistance of the oil-in-water type skin cosmetic of the present invention. As for content of the nonionic surfactant whose HLB in 100 mass% of oil-in-water type skin cosmetics of this invention is less than 7.0, 2.0 mass% or less is preferable, More preferably, it is 1.5 mass% or less. In addition, 0 mass% of the lower limit of content of the nonionic surfactant whose HLB is less than 7.0 may be sufficient.

It is preferable that the oil-in-water type skin cosmetic of this invention contains the component E (zinc oxide) further. In particular, when component A contains component A1 (in particular, component A is component A1), it is preferable that the oil-in-water skin cosmetic of the present invention contains component E. By containing component E, the effect which further heightens the ultraviolet protective effect of the oil-in-water type skin cosmetics of this invention, especially the protective effect from the ultraviolet-ray of a light wavelength range is exhibited. The component E may be processed with well-known surface treating agents, such as isostearic acid, isostearyl sebacic acid, dimethyl polysiloxane, and methylhydrogen polysiloxane. Only 1 type may be used for component E and 2 or more types may be used for it.

Content of the component E in 100 mass% of oil-in-water type skin cosmetics of this invention becomes like this. Preferably it is 5.0 mass% or more, More preferably, it is 8.0 mass% or more, More preferably, 10.0 mass% from a viewpoint of an ultraviolet protective effect. On the other hand, it is 20.0 mass% or less from a viewpoint of suppressing a crumbness (feel like the thing which is caught when stroking the skin surface after application) and cloudiness (the phenomenon which the skin cosmetics on skin appear white after application). More preferably, it is 18.0 mass% or less, More preferably, it is 14.0 mass% or less.

When the oil-in-water type skin cosmetic composition of the present invention contains component E, it is preferable that component C is component C1 (that is, component C consists only of component C1) from the viewpoint of emulsifying properties and stability. When using component E and component C2 or component C3 together, emulsification power and stability may fall.

It is preferable that the oil-in-water type skin cosmetic of this invention does not contain an ionic surfactant, or content of the ionic surfactant in 100 mass% of oil-in-water type skin cosmetics of this invention is 0.1 mass% or less. By making the content of the ionic surfactant as small as possible, precipitation of the component E can be further suppressed. This effect is more remarkable when the component E is included. In the embodiment in which the oil-in-water skin cosmetic composition of the present invention contains the component E, the ionic surfactant is not contained or the content thereof is 0.1 mass. It is more preferable that it is% or less. As said ionic surfactant, anionic surfactant, cationic surfactant, an amphoteric surfactant, etc. are mentioned.

The oil-in-water type skin cosmetic of the present invention preferably further contains component F (dimethylpolysiloxane having a kinematic viscosity of 1.5 to 10.0 mm 2 / s at 25 ° C). By containing the component F, the effect of reducing crunch and stickiness is exhibited. In particular, when the oil-in-water type skin cosmetic composition of the present invention contains the component E, the effect of reducing the feeling of flutter is further exerted. As for the kinematic viscosity in 25 degreeC of component F, 2.0-10.0 mm <2> / s is more preferable. Only 1 type may be used for component F and 2 or more types may be used for it.

Content of the component F in 100 mass% of oil-in-water type skin cosmetics of this invention becomes like this. Preferably it is 0.1 mass% or more, More preferably, it is 0.2 mass% or more, More preferably, it is 0.3 mass% or more. On the other hand, it is 10.0 mass% or less, More preferably, it is 8.0 mass% or less, More preferably, it is 7.0 mass% or less from a skin absorbency viewpoint. More preferably, the content of dimethylpolysiloxane having a kinematic viscosity at 25 ° C. of 2.0 to 10.0 mm 2 / s satisfies the above range. Content of component F is the total amount of all the components F contained in the oil-in-water type skin cosmetic of this invention.

It is preferable that the oil-in-water type skin cosmetic of this invention contains an oil agent further from a viewpoint of making a formulation into an emulsion system. Only 1 type may be used for an oil agent and 2 or more types may be used for it.

Examples of the oil agent include higher aliphatic alcohols, higher fatty acids, fats and oils, hydrocarbon oils, ester oils, silicone oils, and waxes. However, those corresponding to component A and component F are excluded from the oil agent.

The oil agent may be a monovalent branched aliphatic alcohol having 12 to 24 carbon atoms such as octyldodecanol, decyl tetradecanol, or isostearyl alcohol; C12-22 monovalent linear unsaturated aliphatic alcohols, such as oleyl alcohol; Monovalent straight-chain saturated aliphatic alcohols having 12 to 22 carbon atoms such as cetyl alcohol, stearyl alcohol and behenyl alcohol; Higher fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, polyhydroxystearic acid, oleic acid, behenic acid, undecylenic acid, lanolin acid, and isostearic acid; Palm oil, palm oil, hydrogenated palm oil, avocado oil, sesame oil, olive oil, cucounuts oil, safflower oil, almond oil, corn oil, cottonseed oil, sunflower seed oil, grape seed oil, hazelnut oil, macadamia nut oil, meadowfoam oil, rosehip oil, etc. Maintenance of; Hydrocarbon oils such as isododecane, isohexadecane, isohexadodecane, olefin oligomers, light liquid isoparaffins, squalanes, liquid paraffins, liquid isoparaffins and petrolatum; Ethyl oleate, isopropyl myristin, 2-ethylhexyl palmitate, isopropyl palmitic acid, isopropyl palmitic acid, myristyl palmitic acid, cetyl oleate, oleic acid oleic acid, octylate acid octyldecyl, octylate oleic acid, ethyl isostearic acid, isostearic acid Isopropyl, 2-ethylhexanoic acid cetyl, 2-ethylhexanoic acid cetostearyl, tri2-ethylhexanoic acid glyceryl (trioctanoin), tri (caprylic capric acid) glyceryl, triisopalmitinic acid glyceryl , Tetra2-ethylhexanoate pentaerythritol, isocetyl octanoate, isostearyl octanoate, isostearyl, isostearic acid isocetyl, ocstearic acid octyldodecyl, dimethyloctanoic acid octyldodecyl, isostearic acid propylene glycol, hydroxystearic acid hydrogenated Ester oils such as castor oil; Silicone oils such as dimethicone; And lead such as jojoba oil and beeswax.

The content of the oil agent in 100% by mass of the oil-in-water type skin cosmetic of the present invention is preferably 2.0% by mass or more, more preferably 3.0% by mass or more, and even more preferably 5.0% by mass from the viewpoint of functionality such as the emollient effect. It is% or more, From a viewpoint of ensuring a refreshing usability, Preferably it is 30.0 mass% or less, More preferably, it is 25.0 mass% or less, More preferably, it is 20.0 mass% or less. Content of an oil agent is a total amount of all the oil agents contained in the cosmetics of this invention, when using two or more oil agents.

From the viewpoint of functionality such as the emollient effect, the total amount of the content of component A in 100 mass% of the oil-in-water type skin cosmetic of the present invention is preferably 10.0 mass% or more, and more preferably 15.0 mass% or more. From the viewpoint of ensuring a clean usability, the content is preferably 35.0% by mass or less, and more preferably 30.0% by mass or less.

The oil-in-water type skin cosmetic of the present invention may further contain components (other components) other than the above components A to F. Other components include, for example, lower alcohols such as ethanol, polyhydric alcohols, powders, antioxidants, preservatives, flavorings, coloring agents, chelating agents, refreshing agents, vitamins, neutralizing agents, amino acids, pH adjusters, whitening agents, anti-inflammatory agents, deodorants, Additives, such as a flora and fauna extract, a metal ion blocking agent, and a film forming agent, etc. are mentioned. Only 1 type may be used for the said other component, and 2 or more types may be used for it.

The oil-in-water type skin cosmetic of the present invention may contain ethanol. Although content of ethanol in 100 mass% of oil-in-water type skin cosmetics of this invention is not specifically limited, From a usability and antiseptic property, Preferably it is 1.0 mass% or more, More preferably, it is 2.0 mass% or more, On the other hand, it is irritant In terms of emulsion stability, the content is preferably 20.0% by mass or less, and more preferably 10.0% by mass or less.

The oil-in-water type skin cosmetic of the present invention may contain a polyhydric alcohol. Examples of the polyhydric alcohols include glycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2 -Octanediol, 1,2-decane diol, polyoxypropylene methyl glucoside, etc. are mentioned. Content of the polyhydric alcohol in 100 mass% of oil-in-water type skin cosmetics of this invention is 1.0 mass% or more from a usability and antiseptic viewpoint, Preferably it is 2.0 mass% or more, On the other hand, from a viewpoint of stickiness suppression. Preferably it is 30.0 mass% or less, More preferably, it is 20.0 mass% or less, More preferably, it is 10.0 mass% or less.

The pH of the oil-in-water type skin cosmetic of the present invention is, for example, at 25 ° C., preferably 4.5 to 9.5, and more preferably 5.0 to 9.0.

Examples of the oil-in-water type skin cosmetic of the present invention include sunblock cosmetics and skin care cosmetics (moisturizing, makeup base, foundation, scalp care cosmetics, anti-aging cosmetics, body care cosmetics, whitening cosmetics, and the like). . The oil-in-water type skin cosmetic of the present invention may be any of cosmetics, quasi-drugs, medicines, and sundries.

The site to which the oil-in-water type skin cosmetic of the present invention is applied includes a face (for example, a forehead, eyes, a tail, a cheek, a mouth, etc.), an arm, an elbow, a back of a hand, a fingertip, a leg, a knee, a heel, a neck, an armpit And the like.

As a method of preparing the oil-in-water type skin cosmetic of this invention, each said component is mixed, the method of stirring using a well-known method, for example, a homomixer, etc. are mentioned.

The oil-in-water type skin cosmetic of this invention contains the ultraviolet absorber (component A1) and / or ester oil (component A2) which has a sterol skeleton. The mechanism which exhibits the effect of combining these stably is estimated as follows.

The oil-in-water type skin cosmetic of the present invention can exhibit a protective effect against ultraviolet rays particularly in the light wavelength region by containing an ultraviolet absorber (component A1). However, since an ultraviolet absorber is generally an oily agent with high polarity, surfactant is hard to distribute to an oil-water interface, and it is difficult to emulsify. It is possible to increase the emulsifying power by using a large amount of a surfactant of about HLB 12, but in this case, since the component A1 and water are likely to re-emulsify after application and drying of the oil-in-water type skin cosmetic, There arises a problem that the ultraviolet absorbent tends to flow down to water or sweat.

On the other hand, in this invention, component A1 is emulsified using the polyoxyethylene type | mold nonionic surfactant (component B) whose HLB is 14.5 or more, without using substantially surfactant of about HLB12. to be. Since component B has high hydrophilicity, when it contacts with water after application and drying of an oil-in-water type skin cosmetic, it is easy to form a micelle only by component B, and it is difficult to re-emulsify component A1, and it does not reduce water resistance. In addition, unlike other nonionic surfactants such as polyglycerols, component B has a relatively bulky hydrophilic group, so that the curvature of the oil-water interface is small, and the density of the surfactant at the oil-water interface is high. . For this reason, emulsification power is high and emulsion stability becomes high.

However, only the said component B is inadequate enough to fully improve emulsion stability. Therefore, in this invention, by using together the specific acrylic polymer (component C) which has a comparatively large hydrophobic group, polymers bridge | crosslink and interact with oil droplets, and the emulsion stability is improved.

This invention is estimated by the said effect | action, but succeeded in achieving both high water resistance and emulsion stability of the cosmetics containing component A1.

In addition, the mechanism by which the effect of emulsifying the component A2 which is known to have a high skin care effect stably is exhibited is estimated as follows.

Since component A2 is a highly polar oil agent, surfactant is hard to distribute to an oil-water interface, and it is difficult to emulsify. It is possible to increase the emulsifying power by using a large amount of a surfactant of about HLB 12, but in this case, stickiness occurs and a problem that the feeling of use as a skin cosmetic is lowered.

In contrast, the present invention is characterized in that component A2 is emulsified with a relatively small amount of surfactant using a polyoxyethylene type nonionic surfactant (component B) having an HLB of 14.5 or more. Unlike other nonionic surfactants such as polyglycerols, component B is relatively bulky in hydrophilic group, so that the curvature of the oil-water interface is small, and the density of the surfactant at the oil-water interface is high. For this reason, emulsification power is high and emulsion stability becomes high.

However, only the said component B is inadequate enough to fully improve emulsion stability. Therefore, in this invention, by using together the specific acrylic polymer (component C) which has a comparatively large hydrophobic group, polymers bridge | crosslink and interact with oil droplets, and the emulsion stability is improved.

By this effect, in this emulsion cosmetic containing component A2, high emulsification stability was achieved, maintaining stickiness and suppressing stickiness.

Moreover, in this invention, there is also an advantage that water resistance is also excellent by using the component B. Since surfactant of about HLB 12 is easy to reemulsify component A2 and water after application | coating and drying of an oil-in-water type skin cosmetic, water resistance falls and the problem that component A becomes easy to flow in water, sweat, etc. arises. do. On the other hand, since component B has high hydrophilicity, when it contacts with water after application and drying of an oil-in-water type skin cosmetic, it is easy to form a micelle only by component B, and since it is difficult to re-emulsify component A2, water resistance falls Don't let that happen.

EXAMPLE

Hereinafter, although this invention is demonstrated in more detail based on an Example, this invention is not limited only to these Examples. In addition, the compounding quantity and content of each component in a table | surface are the quantity converted into pure components, and show "mass%" unless there is particular notice.

Examples 1-13 and Comparative Examples 1-6 (Preparation of oil-in-water type skin cosmetic)

According to the composition recorded in Tables 1-3, according to the conventional method, each oil-in-water cosmetic of the Example and the comparative example was prepared.

The oil-in-water skin cosmetics of Examples 1 to 13 were latex. The pH of 25 degreeC of the oil-in-water type skin cosmetic of Examples 1-10 was 8.0-9.0, and pH of 25 degreeC of the oil-in-water type skin cosmetic of Examples 11-13 was 6.0-7.0.

Examples 21-31 and Comparative Examples 21-25 (Preparation of oil-in-water type skin cosmetic)

According to the composition shown to the following Tables 4-5, each oil-in-water cosmetic of the Example and the comparative example was prepared according to the conventional method.

The oil-in-water type skin cosmetic of Examples 21-31 was milky liquid, and pH of 25 degreeC was 6.0-7.0.

The detail of the main raw material in an Example, a comparative example, and a prescription example is as follows.

Paramethoxy cinnamic acid 2-ethylhexyl: A brand name "Ubinul MC 80", BASF Corporation make

Diethylaminohydroxybenzoyl benzoic acid hexyl: trade name "Ubinul A Plus Granular", manufactured by BASF Corporation

Bisethylhexyloxyphenol methoxyphenyl triazine: Brand name "Tinosorb S", BASF Corporation make

Polyoxyethylene hardened castor oil (E.O.100): Brand name "HCO-100", Nikko Chemicals Corporation make, HLB = 16.5

Monooleic acid polyoxyethylene sorbitan (E.O.20): Brand name "Leodol TW-O120V", Gao Corporation make, HLB = 15.0

Monostearic acid polyoxyethylene sorbitan (E.O.20): Brand name "Leodol TW-S120V", Gao Corporation make, HLB = 14.9

Polyoxyethylene hardened castor oil (E.O.30): Brand name "HCO-30", the Nikko Chemicals company make, HLB = 11.0

Sesquiisostearic acid sorbitan: Brand name "Cosmol 182V", manufactured by Nisshin Seiyu Co., Ltd.

Dimethyl polysiloxane: A brand name "SH200 C Fluid 5CS", Toray Dow Corning Co., Ltd., Kinematic viscosity in 25 degreeC = 5mm <2> / s

1,3-BG: 1,3-butylene glycol

Macadamia Nuts fatty acid phytosteryl: Brand name `` PLANDOOL MAS '', manufactured by Nippon Seika Co., Ltd.

Macadamia Nuts fatty acid cholesteryl: Brand name `` PLANDOOL MAC '' manufactured by Nippon Seika Co., Ltd.

Carbomer: A brand name "Carbopol 980", the Nippon Lubrizol company make, carboxyvinyl polymer

EtOH: Ethanol

(Evaluation test 1: evaluation of stability)

About 100 g of the oil-in-water type skin cosmetics of each Example and the comparative example were filled in the glass bottle (so-called mayonnaise bottle) with a wide inlet, and it kept for 4 weeks in 40 degreeC conditions in the thermostat in the sealed state. After returning each oil-in-water skin cosmetics after storage to the conditions of room temperature (25 degreeC), the external appearance of each oil-in-water skin cosmetics in a glass bottle was visually observed. In addition, each oil-in-water type skin cosmetic was spread on a glass plate, and uniformity was observed. From the above observations, the stability of each oil-in-water type skin cosmetic was evaluated based on the following criteria.

○ (good): The separation was not observed at all in appearance observation, and was uniform even when spread.

△ (usable): Although no separation was observed in appearance observation, it was slightly uneven when spread and applied.

× (poor): Separation was observed in appearance observation.

(Evaluation test 2: evaluation of water resistance)

Immediately after applying the oil-in-water type skin cosmetic of Examples 1-13 and Comparative Examples 1-6 to a forearm inner part, and drying, the application part of the oil-in-water type skin cosmetic was placed in running water for about 5 minutes. Then, the difference of the water splashing method of the coating part and the non-coating part was observed visually, and water resistance was evaluated by the following reference | standard.

○ (good): The application part was bouncing off the water clearly, and the attached water fell into water.

Δ (usable): Although the coating part bounces off water, the water droplets of the attached water remain in the coating part.

X (poor): The difference of the water splashing method is not seen by a coating part and a non-coating part.

(Evaluation test 3: evaluation of no stickiness)

Immediately after applying the oil-in-water type skin cosmetic of each Example and the comparative example to the forearm inner part, and rubbing, the application part of the oil-in-water type skin cosmetic was stroked by hand, and the presence or absence of stickiness was evaluated by the following reference | standard.

(Good): The application part was smooth and the resistance by adhesion was not felt.

△ (usable): Although resistance by adhesion was felt a little, it was possible to slide the hand sufficiently.

X (poor): The resistance by adhesion was strong enough that it became difficult to slip a hand.

Three professional evaluation members evaluated. Moreover, evaluation was performed also in the face, and the same result was obtained.

TABLE 1

TABLE 2

TABLE 3

From the above table, it was found that the skin cosmetic of the embodiment satisfying the composition of the present invention has an excellent effect in terms of stability, water resistance and usability.

On the other hand, from Comparative Example 1 and Comparative Example 3, when the content of component B is less than the prescribed amount, the effect is inferior in terms of stability and water resistance, and such an effect is a nonionic surfactant having HLB of 7.0 or more and less than 14.5. It was found that the supplement did not improve. From the comparative example 2, it turned out that when the quantity of the component B is larger than a prescribed amount, the deterioration of the usability which loses a fresh usability and stickiness arises. From the comparative example 4, when the component B is not contained and supplemented with the nonionic surfactant whose HLB is 7.0 or more and less than 14.5 instead, and from the comparative example 5, even if the prescribed amount of component B is contained, HLB is 7.0 or more When 0.1 mass% or more of nonionic surfactants of less than 14.5 exist, an emulsification system could not be prepared and evaluation itself was impossible. From Comparative Example 6, it was found that the effect was inferior in terms of stability when the component C was not included.

TABLE 4

TABLE 5

From the above table, it was found that the skin cosmetic of the example satisfying the composition of the present invention has an excellent effect in terms of stability and usability.

On the other hand, it was found from Comparative Example 21 and Comparative Example 25 that the component C was inferior in terms of stability. In the case of Comparative Example 22 in which the component B was smaller than the prescribed amount, emulsification could not be stably performed, and separation occurred and was inferior in terms of usability. Moreover, even if HLB supplemented the nonionic surfactant of 7.0 or more and less than 14.5, it turned out that stability is inferior (comparative example 24). In addition, from the comparative example 23, when the component B was more than the prescribed amount, stickiness generate | occur | produced and it turned out that it is inferior in the point of usability.

(Evaluation test 4: evaluation of water resistance)

About each oil-in-water type skin cosmetic of Examples 21, 25, 26, and the comparative example 24, water resistance was further evaluated by the method similar to said "evaluation test: 2", and the same reference | standard.

As a result, when the oil-in-water type skin cosmetic of Comparative Example 24 was used, there was no difference in the water splashing method between the coated portion and the non-coated portion, and the water resistance was insufficient. On the other hand, in the case of using the oil-in-water type skin cosmetics of Examples 21, 25, and 26, it was found that the coating part was bouncing off the water and the water resistance was improved.

Moreover, the prescription example of the oil-in-water type skin cosmetic of this invention is shown below.

Prescription example 1 (sunblock cosmetics)

2-methoxyhexyl paramethoxy cinnamic acid         10.0 mass%

Diethylaminohydroxybenzoyl benzoic acid hexyl    2.0 mass%

Bisethylhexyloxyphenol methoxyphenyl triazine    2.0 mass%

POE-100 Cured Castor Oil    3.0 mass%

Monostearic acid PEG-150    0.2 mass%

(Acrylic acid Na / acryloyldimethyltaurine Na) copolymer    0.6 mass%

Hydrophobized Zinc Oxide   12.0 mass%

Sesquiisostearic acid sorbitan 1.5 mass%

Dimethyl polysiloxane # 2.0 mass%

Hard Flow Isoparaffin 15.0 mass%

2-ethylhexanoic acid cetyl 5.0 mass%

Methyl paraben 0.3 mass%

Phenoxyethanol 0.3% by mass

Octoxyglycerin 0.1 mass%

Menthol 0.1% by mass

Fragrance 0.1 mass%

Water remainder

Total: 100 mass%

Prescription example 2 (body care cosmetics)

Paramethoxy cinnamic acid 2-ethylhexyl 0.010.0 mass%

Polysorbate 60 2.0 Mass%

(Acrylic acid Na / acryloyl dimethyl taurine Na) copolymer 0.5 mass%

Hydrophobization treatment Zinc oxide 8.0 mass%

Octenyl zucchini corn starch Al 5.0 mass%

Oleic acid sorbitan 1.5% by mass

Dimethyl polysiloxane 5.0 mass%

Fluid paraffin 15.0 mass%

Glyceryl of tri2-ethylhexanoic acid # 5.0 mass%

Methyl paraben 0.3 mass%

Phenoxyethanol 0.3% by mass

Octoxyglycerin 0.1% by mass

Menthol 0.1% by mass

Fragrance 0.1 mass%

Ethanol: 5.0 mass%

Water cup

Total: 100 mass%

Prescription example 3 (skin care cosmetics)

(mass%)

Macadamia Nuts Fatty Acid Phytosteril 5.0

Macadamia Nuts Fatty Acid Cholesterol 2.0

Polysorbate 60 3.0

(Acrylic acid Na / acryloyldimethyltaurine Na) copolymer 0.6

64.5

Octenyl pumpkin corn starch Al 전 2.0

Dimethicone 2.0

Floating Paraffin 15.0

2-ethylhexanoic acid cetyl sulfate 5.0

Methylparaben 0.3

Phenoxyethanol 0.3

Octoxyglycerin 0.1

Menthol 0.1

Spices 0.1

Sum          100 (mass%)

Industrial availability

Since the oil-in-water type skin cosmetic of the present invention is a composition in which a highly hydrophobic ultraviolet absorbent is highly blended, it can be suitably used as a sunblock cosmetic or a makeup base agent having a sunscreen function, furthermore a body care cosmetic and a skin care cosmetic.

Claims (7)

It contains following component A, following component B, following component C, and following component D, and content of the said component B is 1.0-4.0 mass%,
Oil-in-water type skin cosmetic containing no nonionic surfactant with HLB of 7.0 or more and less than 14.5 or 0.1 mass% or less of nonionic surfactant with HLB of 7.0 or more and less than 14.5:
Component A: Component selected from the group consisting of Component A1 and Component A2
Component A1: UV Absorber
Component A2: an emulsion selected from the group consisting of cholesterol fatty acid esters, cholestanol fatty acid esters, phytosterol fatty acid esters and phytostanol fatty acid esters
Component B: Nonionic Surfactant with Polyoxyethylene Chain with HLB of 14.5 to 20.0
Component C: Polymer selected from the group consisting of Component C1, Component C2 and Component C3
Component C1: A polymer comprising a structural unit derived from acryloyldimethyltaurate
Component C2: The polymer containing the structural unit derived from (meth) acrylic acid and / or the (meth) acrylic-acid alkylester, and the structural unit derived from (meth) acrylic-acid polyoxyethylene alkyl ether at least.
Component C3: Alkyl Modified Carboxyvinyl Polymer
Component D: Water. The method of claim 1,
The component C1 is a (Naacrylate / acryloyldimethyltaurine Na) copolymer, the component C2 is a (acrylate / methacrylate steares-20) copolymer and / or (acrylate / methacrylic behenes- 25) Oil-in-water type skin cosmetic that is a copolymer. The method according to claim 1 or 2,
The oil-in-water type skin cosmetic composition wherein said component A2 is macadamia nut fatty acid phytosteryl and / or macadamia nut fatty acid cholesteryl. The method according to claim 1 or 2,
Oil-in-water skin cosmetics, wherein the component C is the component C1. The method of claim 4, wherein
Further oil-in-water skin cosmetics comprising the following component E:
Component E: Zinc Oxide. The method according to any one of claims 1 to 5,
The oil-in-water type skin cosmetic which does not contain an ionic surfactant or whose content of an ionic surfactant is 0.1 mass% or less. The method according to any one of claims 1 to 6,
Further oil-in-water skin cosmetics comprising the following component F:
Component F: Dimethyl polysiloxane whose kinematic viscosity in 25 degreeC is 1.5-10.0 mm <2> / s.