JPWO2013024866A1 - 高濃度エマルション - Google Patents
高濃度エマルション Download PDFInfo
- Publication number
- JPWO2013024866A1 JPWO2013024866A1 JP2013529024A JP2013529024A JPWO2013024866A1 JP WO2013024866 A1 JPWO2013024866 A1 JP WO2013024866A1 JP 2013529024 A JP2013529024 A JP 2013529024A JP 2013529024 A JP2013529024 A JP 2013529024A JP WO2013024866 A1 JPWO2013024866 A1 JP WO2013024866A1
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- Prior art keywords
- emulsion
- water
- oil
- liquid crystal
- present
- Prior art date
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- Granted
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Abstract
Description
本発明は、高濃度であるにもかかわらず長期にわたり分散質を安定に維持するエマルション(以下、本発明のエマルションとも称する)に関する。本発明のエマルションは、分散質の平均粒子径が5nm〜100nmの範囲であることにより、長期にわたるエマルションの安定性を維持することができ、その結果、透明又は半透明の外観を呈している。ここで、本明細書で使用する「透明又は半透明」とは、分散質が分散媒に適切に分散されている状態の指標を指し、具体的には光透過率が対水溶媒比で70%以上の状態をいう。本発明において、本発明のエマルションの光透過率は、対水溶媒比で80%以上、より好ましくは90%以上であることが好ましい。
本発明のエマルションは、両親媒性分子、水及び油分を含んでいる。本発明のエマルションにおいて、両親媒性分子及び油分は分散質を構成し、水は分散媒を構成する。
本発明のエマルションは、補助界面活性剤、又は水溶性添加物、例えば多価アルコール、無機塩、水溶性ポリマー、その他の水溶性化合物など、をさらに含むことができる。
−両親媒性分子の配合量は、本発明のエマルションの総重量あたり、0.001〜25重量%、好ましくは0.01〜20重量%である。
−水の配合量は、本発明のエマルションの総重量あたり、10〜99.9重量%、好ましくは30〜99.9重量%である。
−油分の配合量は、本発明のエマルションの総重量あたり、0.0001〜50重量%、好ましくは0.001〜40重量%、更に好ましくは0.001〜35重量%である。
−補助界面活性剤の配合量は、本発明のエマルションの総重量あたり、0〜20重量%、好ましくは0.001〜10重量%である。
−多価アルコールの配合量は、本発明のエマルションの総重量あたり、0〜80重量%、好ましくは0.1〜70重量%である。
−無機塩の配合量は、本発明のエマルションの総重量あたり、0〜15重量%、好ましくは0.001〜10重量%である。
−水溶性ポリマーの配合量は、本発明のエマルションの総重量あたり、0〜10重量%、好ましくは0.001〜5重量%である。
本発明のエマルションは、分散質に化粧品や医薬品の有効成分をさらに配合することにより、外部環境応答型ナノカプセルとして、皮膚外用剤(例えば化粧品、皮膚外用の医薬部外品、医薬品)、医薬品を提供することができる。
以下、本発明のエマルションの調製方法について例示する。
−両親媒性分子の配合量は、ディスコンティニュアス・キュービック液晶の総重量あたり、10〜60重量%、好ましくは15〜45重量%である。
−水の配合量は、ディスコンティニュアス・キュービック液晶の総重量あたり、5〜90重量%、好ましくは10〜80重量%である。
−油分の配合量は、ディスコンティニュアス・キュービック液晶の総重量あたり、1〜60重量%、好ましくは5〜45重量%である。
−補助界面活性剤の配合量は、ディスコンティニュアス・キュービック液晶の総重量あたり、0〜20重量%、好ましくは0.1〜10重量%である。
−多価アルコールの配合量は、ディスコンティニュアス・キュービック液晶の総重量あたり、0〜75重量%、好ましくは5〜50重量%である。
−無機塩の配合量は、ディスコンティニュアス・キュービック液晶の総重量あたり、0〜15重量%、好ましくは0.1〜10重量%である。
−水溶性ポリマーの配合量は、ディスコンティニュアス・キュービック液晶の総重量あたり、0〜10重量%、好ましくは0.1〜5重量%である。
本試験で使用した試薬は以下の通りである。
ポリオキシエチレンオクチルドデシルエーテル : 花王ケミカル社製エマルゲン2020G−HA (HLB:13.0)
グリセリン : 花王ケミカル社製濃グリセリン
スクワラン : 日光ケミカルズ社製精製オリーブスクワラン
エチルヘキサン酸セチル : 日光ケミカルズ社製CIO
ポリオキシエチレンオクチルドデシルエーテル(30g)、スクワラン(15g)、グリセリン(38g)、精製水(17g)を秤量後、80℃で加熱混合した溶液を室温まで冷却した。組成物の液晶構造は、目視観察、偏光顕微鏡法観察、小角X線散乱法及び色素染色法を組み合わせて利用することにより特定した。
高剪断力ホモミキサー(プライミクス社製、ロボミックスMII−2.5)を用いて、調製例1のエマルションの安定性を評価した。安定性の指標として分光光度計(島津製作所社製、UVmini−1240、波長=550nm)で計測される光透過率を用いた。各剪断力(撹拌速度)におけるエマルションの光透過率の経時変化を図2に示す。なお、光透過率は水の光透過率を100%として算出している。
油分の含有量が異なるディスコンティニュアス・キュービック液晶を調製し、グリセリン水溶液(グリセリン重量分率=0.69)で希釈した時のエマルションの粒子径と透明度を評価した。具体的には、下記表2の成分及び組成(重量分率)においてディスコンティニュアス・キュービック液晶を調製し、重量比でディスコンティニュアス・キュービック液晶:グリセリン水溶液=5:95のエマルションを作製した。
動的光散乱(DLS、大塚電子社製、ELS−710TY)、透過型電子顕微鏡(TEM、日本電子社製)を用いて、調製例1のディスコンティニュアス・キュービック液晶を調製し、グリセリン水溶液(グリセリン重量分率=0.69)で希釈した時のエマルションの構造を評価した。ディスコンティニュアス・キュービック液晶の各重量%に対する平均粒子径を表3に示す。
Claims (10)
- 両親媒性分子、水及び油分を含むエマルションであって、
該エマルションは、両親媒性分子の可溶化限界量を超える分散質が分散媒に分散しているものであり、かつ、対水溶媒比で70%以上の光透過率を示し、
該分散質の平均粒子径は5〜100nmの範囲である
ことを特徴とする、前記エマルション。 - 油分の配合量は、両親媒性分子の配合量に対して、重量比で2.0倍以下である、請求項1記載のエマルション。
- 両親媒性分子は、非イオン界面活性剤である、請求項1記載のエマルション。
- 水溶性添加物をさらに含んでいる、請求項1記載のエマルション。
- 水溶性添加物は、多価アルコール、無機塩及び水溶性高分子よりなる群から選択される1種以上である、請求項4記載のエマルション。
- 請求項1〜5のいずれか記載のエマルションを含む皮膚外用剤。
- 皮膚外用剤は化粧品、又は皮膚外用の医薬部外品若しくは医薬品である、請求項6記載の皮膚外用剤。
- 請求項1〜7のいずれか記載のエマルションを含む医薬品。
- エマルションの調製方法であって、
両親媒性分子、水及び油分を含むディスコンティニュアス・キュービック(Discontinuous Cubic)液晶を調製する第1の工程と、
前記液晶を水又は水溶性添加物を含む水溶液で添加希釈して透明又は半透明な水溶液を調製する第2の工程とを含んでおり、
油分の配合量は両親媒性分子に対して重量比で2倍以下である、
ことを特徴とする、前記方法。 - 第2の工程は、撹拌速度で3000rpm未満の剪断力下で実施する、請求項9記載の方法。
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