WO2012081446A1 - Oil-in-water emulsion sunscreen composition - Google Patents

Oil-in-water emulsion sunscreen composition Download PDF

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Publication number
WO2012081446A1
WO2012081446A1 PCT/JP2011/078126 JP2011078126W WO2012081446A1 WO 2012081446 A1 WO2012081446 A1 WO 2012081446A1 JP 2011078126 W JP2011078126 W JP 2011078126W WO 2012081446 A1 WO2012081446 A1 WO 2012081446A1
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oil
water emulsion
present
cosmetic
sunscreen composition
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PCT/JP2011/078126
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French (fr)
Japanese (ja)
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登美子 高倉
鈴木　祐子
博芳 佐藤
洋介 池邉
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株式会社 資生堂
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/55—Phosphorus compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/04—Dispersions; Emulsions
    • A61K8/06—Emulsions
    • A61K8/062—Oil-in-water emulsions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A61P17/04—Antipruritics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
    • A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations

Definitions

  • the present invention relates to a low-viscosity sunscreen cosmetic that has a high UV protection effect and also has excellent stability and usability.
  • Sunscreen cosmetics are required to satisfy various conditions such as sufficient UV protection effect, safety, feeling of use, water resistance, transfer resistance, etc.
  • emulsification type lotion type, oil type, gel type, aerosol Products in the form of types are known.
  • oil-in-water emulsions can be formulated from low SPF to high SPF products because a small to large amount of UV absorber can be blended in the oil phase (dispersed phase). Since a refreshing feeling is obtained, it is widely used as a base for sunscreen cosmetics.
  • Patent Document 1 the amount of the phosphate surfactant is reduced by combining a phosphate surfactant and a sulfopolyester. It is described that improved.
  • inorganic ultraviolet scattering agents such as fine particle titanium oxide and fine particle zinc oxide are blended to impart UV protection.
  • inorganic ultraviolet shielding powder such as fine particle titanium oxide or fine particle zinc oxide is blended, the finish may become whitish, or a squeaky or powdery texture may occur.
  • Patent Document 2 describes a sunscreen composition comprising an inorganic sunscreen agent, a specific anionic emulsifier, and an oil component. By using such a combination, inorganic sunscreen is maintained while maintaining a high SPF. It describes that the compounding amount of the agent is reduced and the usability is improved.
  • an object of the present invention is to provide a low-viscosity oil-in-water sunscreen cosmetic having a high UV-absorbing effect and a sufficient UV protection effect, and having good usability.
  • the inventors of the present invention have achieved a low emulsion by emulsifying a raw material containing a specific surfactant and ultraviolet absorber into a nanoemulsion using a high shear device. It has been found that a cosmetic can be obtained which is stable and excellent in usability even with a viscosity and has sufficient UV protection, and the present invention has been completed.
  • the present invention It comprises an oil-in-water emulsion containing (A) an alkyl phosphate and (B) an ultraviolet absorber and having oil droplets having a number average particle size of less than 130 nm by high shearing treatment, and the emulsion at 30 ° C.
  • An oil-in-water emulsified sunscreen cosmetic having a viscosity of 20 mPa ⁇ s or less is provided.
  • the sunscreen cosmetic according to the present invention is composed of a low-viscosity oil-in-water emulsion, which not only gives a fresh feel when applied, but also has no stickiness or oiliness and is excellent in use feeling. In addition, it is excellent in stability despite the incorporation of an ultraviolet absorber in an amount that provides a sufficient ultraviolet protective effect.
  • the cosmetic of the present invention contains an alkyl phosphate (component A) as an essential component.
  • Alkyl phosphates used in the present invention may be those conventionally known as anionic surfactants.
  • Alkali metals of monoalkyl phosphate, dialkyl phosphate or trialkyl phosphate (for example, sodium, potassium, etc.) Etc.) Contains salt.
  • the blending amount of the alkyl phosphate in the cosmetic of the present invention is preferably 0.2 to 2.1% by mass, more preferably 0.5 to 1.5% by mass. If the blending amount is less than 0.2% by mass, a stable emulsion may not be obtained. If the blending amount exceeds 2.1% by mass, problems such as stickiness may occur.
  • an ultraviolet absorber (component B).
  • the ultraviolet absorber used by this invention is not specifically limited, Preferably it is a liquid organic ultraviolet absorber at normal temperature.
  • the organic ultraviolet absorber which is liquid at normal temperature those which have been conventionally blended in cosmetics and the like may be used. Specific examples include ethylhexyl methoxycinnamate, octocrylene, ethylhexyltriazine, t-butylmethoxydibenzoylmethane, and the like, and it is preferable to blend one or more selected from these.
  • the blending amount of the ultraviolet absorber in the cosmetic of the present invention is preferably 4 to 15% by mass, more preferably 6 to 10% by mass.
  • the blending amount is less than 4% by mass, sufficient UV protection ability (SPF) cannot be obtained, and when the blending amount exceeds 15% by mass, stickiness may occur when applied to the skin.
  • the cosmetic of the present invention is a sunscreen cosmetic, and may contain an organic ultraviolet absorbent that is solid at room temperature within the range not impairing the effects of the present invention, in addition to the ultraviolet absorbent (component B).
  • solid organic ultraviolet absorbers include bisethylhexyloxyphenol methoxyphenyltriazine (chemical name: 2,4-bis- ⁇ [4- (2-ethylhexyloxy) 2-hydroxy] -phenyl ⁇ -6- (4- Methoxyphenyl)-(1,3,5) -triazine)), methylenebisbenzotriazolyltetramethylbutylphenol (chemical name: 2,2′-methylenebis [6- (2H-benzotriazol-2-yl) -4 -(1,1,3,3, -tetramethylbutyl) phenol]) and the like.
  • the cosmetic of the present invention inhibits the effects of the present invention by incorporating components that can be usually added to cosmetics, particularly sunscreen cosmetics. It can mix
  • Specific examples include oils, chelating agents, neutralizing agents, pH adjusters, antioxidants, antibacterial agents, and various drugs.
  • the cosmetic of the present invention is dissolved by heating the aqueous phase component containing the alkyl phosphate (component A) and the oil phase component containing the ultraviolet absorber (component B), as necessary. It is characterized in that the oil phase is mixed and dispersed in the aqueous phase by high shear treatment to obtain an oil-in-water emulsion having oil droplets having a number average particle size of less than 130 nm.
  • the “high shear treatment” in the present specification is not particularly limited, but means a treatment for homogenizing by applying a high shear force of at least 40 MPa, preferably 55 MPa.
  • a high shearing treatment can be carried out using a commercially available apparatus such as 15MR manufactured by SPX Corporation APV, Nanogenizer LPN60 manufactured by Serendip, or Homogenizer H-20 manufactured by Sanwa Engineering.
  • the oil droplets in the emulsion constituting the cosmetic of the present invention have a number average particle size of less than 130 nm.
  • This number average particle diameter can be calculated from the particle size distribution measured with a Zetasizer (for example, a concentrated particle size analyzer FPR-1000; manufactured by Otsuka Electronics Co., Ltd.).
  • a Zetasizer for example, a concentrated particle size analyzer FPR-1000; manufactured by Otsuka Electronics Co., Ltd.
  • the cosmetic of the present invention is also characterized in that the emulsion has a viscosity at 30 ° C. of 20 mPa ⁇ s (B-type viscometer) or less.
  • B-type viscometer In sunscreen cosmetics, few examples of such low viscosity have been known so far.
  • the cosmetic of the present invention has a low viscosity and transparent preparation such as lotion, so that the feeling of use is gentle and refreshing. Therefore, the cosmetic composition of the present invention is optimally provided in the form of a sunscreen cosmetic composition that is used, for example, in a mist in a dispenser.
  • Example 1 As is clear from Table 1, the composition of Example 1 subjected to high shear treatment using a high-pressure facility was excellent in transparency and emulsion stability, but was Comparative Example 1 emulsified with a normal homomixer. -1 was not well emulsified, and transparency and stability were insufficient. When a homomixer was used, a stable emulsion could not be obtained even when a water-soluble thickener was added (Comparative Example 1-2).
  • the oil-in-water emulsion composition was prepared using the high shear treatment in the same manner as in Example 1 with the compositions listed in Tables 2 and 3 below, and each of the above items was evaluated. The evaluation results are also shown in each table.

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Abstract

The purpose of the present invention is to provide an oil-in-water emulsion sunscreen composition with low viscosity, which has sufficient ultraviolet blocking effect by containing an ultraviolet absorbent in a large amount and still has good usability. The present invention provides an oil-in-water emulsion sunscreen composition which is characterized by being formed from an oil-in-water emulsion that contains (A) an alkyl phosphate salt and (B) an ultraviolet absorbent and has oil globules having a number average particle diameter of less than 130 nm by high-shear processing. The oil-in-water emulsion sunscreen composition is also characterized in that the emulsion has a viscosity at 30°C of 20 mPa∙s or less.

Description

水中油型乳化日焼け止め化粧料Oil-in-water emulsified sunscreen cosmetics
　本発明は、紫外線防御効果が高く、なおかつ安定性及び使用性にも優れた、低粘度の日焼け止め化粧料に関する。 The present invention relates to a low-viscosity sunscreen cosmetic that has a high UV protection effect and also has excellent stability and usability.
　日焼け止め化粧料には、十分な紫外線防止効果、安全性、使用感、耐水性、耐移り性等の様々な条件を満たすことが求められ、乳化タイプ、ローションタイプ、オイルタイプ、ジェルタイプ、エアゾールタイプといった形態の製品が知られている。
　乳化タイプの中でも、水中油型乳化物は、油相（分散相）中に少量から多量の紫外線吸収剤を配合することが出来るため低ＳＰＦから高ＳＰＦ製品までの製剤化が可能であり、みずみずしくさっぱりとした使用感が得られることから、日焼け止め化粧料の基剤として広く用いられている。 Sunscreen cosmetics are required to satisfy various conditions such as sufficient UV protection effect, safety, feeling of use, water resistance, transfer resistance, etc., emulsification type, lotion type, oil type, gel type, aerosol Products in the form of types are known.
Among the emulsification types, oil-in-water emulsions can be formulated from low SPF to high SPF products because a small to large amount of UV absorber can be blended in the oil phase (dispersed phase). Since a refreshing feeling is obtained, it is widely used as a base for sunscreen cosmetics.
　しかしながら、水中油型乳化物は耐水性に劣るという問題があり、例えば特許文献１では、ホスフェート界面活性剤とスルホポリエステルとを組み合わせることによりホスフェート界面活性剤の配合量を減らし、その結果、耐水性を向上させたことが記載されている。 However, there is a problem that the oil-in-water emulsion is inferior in water resistance. For example, in Patent Document 1, the amount of the phosphate surfactant is reduced by combining a phosphate surfactant and a sulfopolyester. It is described that improved.
　一方、日焼け止め化粧料においては、有機紫外線吸収剤に加えて、微粒子酸化チタンや微粒子酸化亜鉛などの無機紫外線散乱剤を配合して紫外線防御能を付与することが広く行われている。しかし、微粒子酸化チタンや微粒子酸化亜鉛などの無機紫外線遮蔽性粉体を多量に配合すると、仕上がりが白っぽくなったり、きしみ感や粉っぽさを生じることがあった。 On the other hand, in sunscreen cosmetics, in addition to organic ultraviolet absorbers, inorganic ultraviolet scattering agents such as fine particle titanium oxide and fine particle zinc oxide are blended to impart UV protection. However, when a large amount of inorganic ultraviolet shielding powder such as fine particle titanium oxide or fine particle zinc oxide is blended, the finish may become whitish, or a squeaky or powdery texture may occur.
　特許文献２には、無機の日光遮蔽剤、特定のアニオン性乳化剤、及び油成分を含んでなる日光遮蔽組成物が記載され、このような組み合わせを用いることにより高いＳＰＦを保持しながら無機日光遮蔽剤の配合量を減少させ、使用性が改善されたことが記載されている。 Patent Document 2 describes a sunscreen composition comprising an inorganic sunscreen agent, a specific anionic emulsifier, and an oil component. By using such a combination, inorganic sunscreen is maintained while maintaining a high SPF. It describes that the compounding amount of the agent is reduced and the usability is improved.
　ところが、高いＳＰＦを維持するために紫外線吸収剤を高配合（例えば５質量％以上）した水中油型乳化物の粘度を低下させた場合、分離・沈降などを生じる安定性の問題があることが明らかになった。また、紫外線吸収剤及び界面活性剤を配合しているため、油っぽさやべたつきといった使用性の問題もあった。 However, when the viscosity of an oil-in-water emulsion containing a high amount of UV absorber (for example, 5% by mass or more) is decreased in order to maintain a high SPF, there may be a stability problem that causes separation / sedimentation. It was revealed. Moreover, since the ultraviolet absorber and the surfactant are blended, there are problems in usability such as oiliness and stickiness.
特表２００９－５３６９４８号公報Special table 2009-536948 特表２００２－５１５８５１号公報JP 2002-515851 A
　よって本発明における課題は、紫外線吸収剤を高配合して十分な紫外線防御効果を有し、なおかつ使用性も良好な低粘度の水中油型日焼け止め化粧料を提供することである。 Therefore, an object of the present invention is to provide a low-viscosity oil-in-water sunscreen cosmetic having a high UV-absorbing effect and a sufficient UV protection effect, and having good usability.
　本発明者等は、上記課題を解決するために鋭意検討を重ねた結果、特定の界面活性剤及び紫外線吸収剤を含む原料を高せん断機器を用いて乳化してナノエマルジョンとすることにより、低粘度であっても安定で使用性に優れ、なおかつ十分な紫外線防御力を有する化粧料が得られることを見出し、本発明を完成するに至った。 As a result of intensive studies in order to solve the above problems, the inventors of the present invention have achieved a low emulsion by emulsifying a raw material containing a specific surfactant and ultraviolet absorber into a nanoemulsion using a high shear device. It has been found that a cosmetic can be obtained which is stable and excellent in usability even with a viscosity and has sufficient UV protection, and the present invention has been completed.
　即ち本発明は、
（Ａ）アルキルリン酸塩、及び
（Ｂ）紫外線吸収剤を含有し、高せん断処理により数平均粒径が１３０ｎｍ未満の油滴を有する水中油型乳化物からなり、当該乳化物の３０℃における粘度が２０ｍＰａ・ｓ以下であることを特徴とする水中油型乳化日焼け止め化粧料を提供する。 That is, the present invention
It comprises an oil-in-water emulsion containing (A) an alkyl phosphate and (B) an ultraviolet absorber and having oil droplets having a number average particle size of less than 130 nm by high shearing treatment, and the emulsion at 30 ° C. An oil-in-water emulsified sunscreen cosmetic having a viscosity of 20 mPa · s or less is provided.
　本発明に係る日焼け止め化粧料は低粘度の水中油型乳化物からなり、塗布時にみずみずしい感触を与えるのみならず、べたつきや油っぽさが無く使用感に優れている。また、十分な紫外線防御効果を得る量の紫外線吸収剤を配合しているにも関わらず安定性に優れている。 The sunscreen cosmetic according to the present invention is composed of a low-viscosity oil-in-water emulsion, which not only gives a fresh feel when applied, but also has no stickiness or oiliness and is excellent in use feeling. In addition, it is excellent in stability despite the incorporation of an ultraviolet absorber in an amount that provides a sufficient ultraviolet protective effect.
　本発明の化粧料は、アルキルリン酸塩（成分Ａ）を必須成分として含有する。本発明で用いられるアルキルリン酸塩は、アニオン性界面活性剤として従来から知られているものでよく、モノアルキルリン酸、ジアルキルリン酸、あるいはトリアルキルリン酸のアルカリ金属（例えば、ナトリウム、カリウム等）塩を含む。本発明においては、アルキルリン酸カリウム塩、特にセチルリン酸カリウムを用いるのが好ましい。 The cosmetic of the present invention contains an alkyl phosphate (component A) as an essential component. Alkyl phosphates used in the present invention may be those conventionally known as anionic surfactants. Alkali metals of monoalkyl phosphate, dialkyl phosphate or trialkyl phosphate (for example, sodium, potassium, etc.) Etc.) Contains salt. In the present invention, it is preferable to use an alkyl phosphate potassium salt, particularly potassium cetyl phosphate.
　本発明の化粧料におけるアルキルリン酸塩の配合量は、好ましくは０．２～２．１質量％、より好ましくは０．５～１．５質量％である。配合量が０．２質量％未満であると安定な乳化物が得られない場合があり、２．１質量％を越えて配合すると、べたつき等の使用性の問題を生ずる場合がある。 The blending amount of the alkyl phosphate in the cosmetic of the present invention is preferably 0.2 to 2.1% by mass, more preferably 0.5 to 1.5% by mass. If the blending amount is less than 0.2% by mass, a stable emulsion may not be obtained. If the blending amount exceeds 2.1% by mass, problems such as stickiness may occur.
　本発明の化粧料の他の必須成分は紫外線吸収剤（成分Ｂ）である。本発明で用いられる紫外線吸収剤は特に限定されないが、好ましくは常温で液状の有機紫外線吸収剤である。
　常温で液状の有機紫外線吸収剤としては、従来から化粧料等に配合されているものでよい。具体例として、メトキシケイヒ酸エチルヘキシル、オクトクリレン、エチルヘキシルトリアジン、ｔ－ブチルメトキシジベンゾイルメタン等を挙げることができ、これらから適宜選択される１種又は２種以上を配合するのが好ましい。 Another essential component of the cosmetic of the present invention is an ultraviolet absorber (component B). Although the ultraviolet absorber used by this invention is not specifically limited, Preferably it is a liquid organic ultraviolet absorber at normal temperature.
As the organic ultraviolet absorber which is liquid at normal temperature, those which have been conventionally blended in cosmetics and the like may be used. Specific examples include ethylhexyl methoxycinnamate, octocrylene, ethylhexyltriazine, t-butylmethoxydibenzoylmethane, and the like, and it is preferable to blend one or more selected from these.
　本発明の化粧料における紫外線吸収剤の配合量は、好ましくは４～１５質量％、より好ましくは６～１０質量％である。配合量が４質量％未満であると十分な紫外線防御能（ＳＰＦ）が得られず１５質量％を越えて配合すると肌に塗布した際にべたつきを生じるといった問題を生ずることがある。 The blending amount of the ultraviolet absorber in the cosmetic of the present invention is preferably 4 to 15% by mass, more preferably 6 to 10% by mass. When the blending amount is less than 4% by mass, sufficient UV protection ability (SPF) cannot be obtained, and when the blending amount exceeds 15% by mass, stickiness may occur when applied to the skin.
　本発明の化粧料は日焼け止め化粧料であり、前記の紫外線吸収剤（成分Ｂ）に加えて、本願発明の効果を損なわない範囲で、常温で固体の有機紫外線吸収剤を含有していてもよい。固体有機紫外線吸収剤の例としては、ビスエチルヘキシルオキシフェノールメトキシフェニルトリアジン（化学名：２，４－ビス－{［４－（２－エチルヘキシルオキシ）２－ヒドロキシ］－フェニル}－６－（４－メトキシフェニル）－（１，３，５）－トリアジン））、メチレンビスベンゾトリアゾリルテトラメチルブチルフェノール（化学名：２，２’－メチレンビス［６－（２Ｈ－ベンゾトリアゾール－２－イル）－４－（１，１，３，３，－テトラメチルブチル）フェノール］）等が挙げられる。ただし、これらの配合によって化粧料の使用性等に問題を生ずる場合には、常温で固体の有機紫外線吸収剤を配合しないのが好ましい。 The cosmetic of the present invention is a sunscreen cosmetic, and may contain an organic ultraviolet absorbent that is solid at room temperature within the range not impairing the effects of the present invention, in addition to the ultraviolet absorbent (component B). Good. Examples of solid organic ultraviolet absorbers include bisethylhexyloxyphenol methoxyphenyltriazine (chemical name: 2,4-bis-{[4- (2-ethylhexyloxy) 2-hydroxy] -phenyl} -6- (4- Methoxyphenyl)-(1,3,5) -triazine)), methylenebisbenzotriazolyltetramethylbutylphenol (chemical name: 2,2′-methylenebis [6- (2H-benzotriazol-2-yl) -4 -(1,1,3,3, -tetramethylbutyl) phenol]) and the like. However, when a problem arises in the usability of cosmetics and the like due to these blending, it is preferable not to blend a solid organic ultraviolet absorber at room temperature.
　本発明の化粧料は、上記必須成分及び任意の固体紫外線吸収剤及び／又は無機紫外線散乱剤の他に、化粧料、特に日焼け止め化粧料に通常配合されうる成分を、本発明の効果を阻害しない範囲で配合することができる。具体的には、油分、キレート剤、中和剤、ｐＨ調整剤、酸化防止剤、抗菌剤、各種薬剤などが挙げられる。 In addition to the above essential components and optional solid UV absorbers and / or inorganic UV scattering agents, the cosmetic of the present invention inhibits the effects of the present invention by incorporating components that can be usually added to cosmetics, particularly sunscreen cosmetics. It can mix | blend in the range which does not. Specific examples include oils, chelating agents, neutralizing agents, pH adjusters, antioxidants, antibacterial agents, and various drugs.
　更に本発明の化粧料は、前記アルキルリン酸塩（成分Ａ）を含む水相成分と、前記紫外線吸収剤（成分Ｂ）を含む油相成分とを、各々必要に応じて加熱することにより溶解混合し、高せん断処理により水相中に油相を均質分散させて、数平均粒径が１３０ｎｍ未満の油滴を有する水中油型乳化物としたことを特徴としている。 Furthermore, the cosmetic of the present invention is dissolved by heating the aqueous phase component containing the alkyl phosphate (component A) and the oil phase component containing the ultraviolet absorber (component B), as necessary. It is characterized in that the oil phase is mixed and dispersed in the aqueous phase by high shear treatment to obtain an oil-in-water emulsion having oil droplets having a number average particle size of less than 130 nm.
　本明細書における「高せん断処理」とは、特に限定されるものではないが、少なくとも４０ＭＰａ、好ましくは５５ＭＰａという高い剪断力をかけて均質分散（ホモジナイズ）する処理を意味する。
　このような高せん断処理は、例えば、ＳＰＸ　Ｃｏｒｐｏｒａｔｉｏｎ　ＡＰＶ社製の１５ＭＲ、セレンディップ社製のナノジナイザーＬＰＮ６０、三和エンジニアリング社製のホモゲナイザーＨ－２０等の市販の装置を用いて実施することができる。 The “high shear treatment” in the present specification is not particularly limited, but means a treatment for homogenizing by applying a high shear force of at least 40 MPa, preferably 55 MPa.
Such a high shearing treatment can be carried out using a commercially available apparatus such as 15MR manufactured by SPX Corporation APV, Nanogenizer LPN60 manufactured by Serendip, or Homogenizer H-20 manufactured by Sanwa Engineering.
　前記のような高せん断処理を施すことにより、本発明の化粧料を構成する乳化物中の油滴は、１３０ｎｍ未満の数平均粒径を持つ。この数平均粒径は、ゼータサイザー（例えば、濃厚系粒径アナライザー　ＦＰＲ－１０００；大塚電子社製）で測定した粒度分布から計算することができる。このような微細粒子状で油相を分散させたことにより、本発明の化粧料は極めて安定なものとすることができた。 By performing the high shear treatment as described above, the oil droplets in the emulsion constituting the cosmetic of the present invention have a number average particle size of less than 130 nm. This number average particle diameter can be calculated from the particle size distribution measured with a Zetasizer (for example, a concentrated particle size analyzer FPR-1000; manufactured by Otsuka Electronics Co., Ltd.). By dispersing the oil phase in the form of such fine particles, the cosmetic of the present invention can be made extremely stable.
　また、本発明の化粧料は、その乳化物の３０℃における粘度が２０ｍＰａ・ｓ（Ｂ型粘度計）以下であることも特徴としている。日焼け止め化粧料において、このような低粘度とした例は、これまでに殆ど知られていない。本発明の化粧料は、化粧水のような低粘度で透明な製剤としたことによって、使用感が優しく爽やかである。従って、本発明の化粧料は、例えばディスペンサーに入れてミスト状に噴霧して使用する日焼け止め化粧料の形態で提供するのに最適である。 The cosmetic of the present invention is also characterized in that the emulsion has a viscosity at 30 ° C. of 20 mPa · s (B-type viscometer) or less. In sunscreen cosmetics, few examples of such low viscosity have been known so far. The cosmetic of the present invention has a low viscosity and transparent preparation such as lotion, so that the feeling of use is gentle and refreshing. Therefore, the cosmetic composition of the present invention is optimally provided in the form of a sunscreen cosmetic composition that is used, for example, in a mist in a dispenser.
　以下に具体例を挙げて本発明を更に詳細に説明するが、本発明は以下の実施例に限定されるものではない。また、以下の実施例等における配合量は特に断らない限り質量％を示す。
　下記表１に掲げる組成の水中油型乳化組成物（実施例及び比較例）を調製し、以下の各項目ついて評価した。評価結果を表１に併せて示す。 Hereinafter, the present invention will be described in more detail with specific examples, but the present invention is not limited to the following examples. Moreover, the compounding quantity in a following example etc. shows the mass% unless there is particular notice.
The oil-in-water emulsion compositions (Examples and Comparative Examples) having the compositions listed in Table 1 below were prepared and evaluated for the following items. The evaluation results are also shown in Table 1.
１．乳化安定性
　組成物を室温又は高温（５０℃）に１ヶ月放置し、目視観察により評価した。
　○：油浮きやクリーミングが観察されない。
　×：油浮きやクリーミングが観察された。
２．乳化粒子
　組成物の粒度分布をゼータタイザー（濃厚系粒径アナライザー　ＦＰＲ－１０００）で測定し、その平均粒子径を計算した。
３．使用感（べたつき）
　各組成物を女性パネル（Ｎ＝２０）の腕や顔部に塗布してもらい、なじみ際のべたつき具合を以下の基準で評価した。
　○：１６名以上がべたつかないと評価した。
　△：６名～１５名がべたつかないと評価した。
　×：べたつかないと評価したのが５名以下。
４．使用感（透明性）
　各組成物をミスト容器に充填し、女性パネル（Ｎ＝２０）の腕や顔部に塗布してもらい、透明性を以下の基準で評価した。
　○：１６名以上が透明と評価した。
　△：６名～１５名が透明と評価した。
　×：透明と評価したのが５名以下。
５．乳化粒子安定性（凝集性）
　組成物を室温又は冷温（０℃以下）に１ヶ月放置し、目視観察により評価した。
　○：凝集や沈殿物が観察されない。
　×：凝集や沈殿物が観察された。 1. Emulsification stability The composition was allowed to stand at room temperature or high temperature (50 ° C.) for 1 month and evaluated by visual observation.
○: No oil floating or creaming is observed.
X: Oil floating and creaming were observed.
2. The particle size distribution of the emulsified particles composition was measured with a zetaizer (concentrated particle size analyzer FPR-1000), and the average particle size was calculated.
3. Feeling of use (stickiness)
Each composition was applied to the arm and face of a female panel (N = 20), and the stickiness at the time of familiarity was evaluated according to the following criteria.
A: Evaluated that 16 or more people were not sticky.
Δ: Evaluated that 6 to 15 people were not sticky.
X: Five or less evaluated that it was not sticky.
4). Usability (transparency)
Each composition was filled in a mist container and applied to the arm and face of a female panel (N = 20), and the transparency was evaluated according to the following criteria.
○: More than 16 people evaluated it as transparent.
Δ: Six to fifteen people evaluated it as transparent.
X: Five or less evaluated as transparent.
5. Emulsion particle stability (aggregation)
The composition was allowed to stand at room temperature or cold (0 ° C. or lower) for 1 month and evaluated by visual observation.
○: No aggregation or precipitation is observed.
X: Aggregation and precipitation were observed.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１から明らかなように、高圧設備を使用して高せん断処理を施した実施例１の組成物は、透明性及び乳化安定性に優れていたが、通常のホモミキサーで乳化した比較例１－１では良好に乳化されず、透明性、安定性ともに不十分であった。また、ホモミキサ－を用いた場合は、水溶性増粘剤を添加しても安定な乳化物が得られなかった（比較例１－２）。 As is clear from Table 1, the composition of Example 1 subjected to high shear treatment using a high-pressure facility was excellent in transparency and emulsion stability, but was Comparative Example 1 emulsified with a normal homomixer. -1 was not well emulsified, and transparency and stability were insufficient. When a homomixer was used, a stable emulsion could not be obtained even when a water-soluble thickener was added (Comparative Example 1-2).
　下記表２及び３に掲げた組成で、実施例１と同様に高せん断処理を用いて水中油型乳化組成物を調製し、上記各項目について評価した。評価結果を各表に併せて示す。 The oil-in-water emulsion composition was prepared using the high shear treatment in the same manner as in Example 1 with the compositions listed in Tables 2 and 3 below, and each of the above items was evaluated. The evaluation results are also shown in each table.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　表２の結果から、乳化剤としてアルキルリン酸塩を用いて高せん断処理を施して製造することにより、乳化剤の量を２．１質量％まで増加させても、べたつきを生じず、３１という高いＳＰＦを達成する量の紫外線吸収剤が配合された低粘度の製剤であるにも関わらず、透明性及び安定性に優れたものとなった（実施例１～３）。
　一方、表３に見られるように、乳化剤を他のアニオン性界面活性剤に置換した場合、透明性が不十分となり、油浮きやクリーミングが生じたり、凝集や沈殿が発生するなど、安定性に劣るものとなった（比較例２－１～３）。 From the results of Table 2, by producing a high shear treatment using an alkyl phosphate as an emulsifier, even if the amount of the emulsifier is increased to 2.1% by mass, no stickiness occurs and a high SPF of 31 is obtained. In spite of the low-viscosity formulation in which an ultraviolet absorber in an amount that achieves the above is blended, it was excellent in transparency and stability (Examples 1 to 3).
On the other hand, as shown in Table 3, when the emulsifier is replaced with another anionic surfactant, the transparency becomes insufficient, oil floatation or creaming occurs, aggregation or precipitation occurs, and so on. The results were inferior (Comparative Examples 2-1 to 3).

Claims (4)

  1. （Ａ）アルキルリン酸塩、及び（Ｂ）紫外線吸収剤を含有し、高せん断処理により数平均粒径が１３０ｎｍ未満の油滴を有する水中油型乳化物からなり、当該乳化物の３０℃における粘度が２０ｍＰａ・ｓ以下であることを特徴とする水中油型乳化日焼け止め化粧料。 It comprises an oil-in-water emulsion containing (A) an alkyl phosphate and (B) an ultraviolet absorber and having oil droplets having a number average particle size of less than 130 nm by high shearing treatment, and the emulsion at 30 ° C. An oil-in-water emulsified sunscreen cosmetic having a viscosity of 20 mPa · s or less.
  2. 前記高せん断処理が、少なくとも４０ＭＰａの剪断力をかけて均質分散させる処理であることを特徴とする、請求項１に記載の化粧料。 The cosmetic according to claim 1, wherein the high shearing treatment is a treatment of applying a shearing force of at least 40 MPa to achieve uniform dispersion.
  3. 前記アルキルリン酸塩が、セチルリン酸カリウムであることを特徴とする、請求項１又は２に記載の化粧料。 The cosmetic according to claim 1 or 2, wherein the alkyl phosphate is potassium cetyl phosphate.
  4. 前記紫外線吸収剤が、メトキシケイヒ酸エチルヘキシル、オクトクリレン、エチルヘキシルトリアジン、ｔ－ブチルメトキシジベンゾイルメタンからなる群から選択される１種又は２種以上であることを特徴とする、請求項１から３のいずれか一項に記載の化粧料。 The ultraviolet absorber is one or more selected from the group consisting of ethylhexyl methoxycinnamate, octocrylene, ethylhexyltriazine, and t-butylmethoxydibenzoylmethane. Cosmetics given in any 1 paragraph.
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