JP2023512679A - 安定なピッカリング型エマルション - Google Patents
安定なピッカリング型エマルション Download PDFInfo
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- JP2023512679A JP2023512679A JP2022546530A JP2022546530A JP2023512679A JP 2023512679 A JP2023512679 A JP 2023512679A JP 2022546530 A JP2022546530 A JP 2022546530A JP 2022546530 A JP2022546530 A JP 2022546530A JP 2023512679 A JP2023512679 A JP 2023512679A
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- pickering
- emulsion
- oil
- type emulsion
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- 239000000839 emulsion Substances 0.000 title claims abstract description 168
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 90
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims abstract description 85
- 235000011187 glycerol Nutrition 0.000 claims abstract description 42
- 235000019359 magnesium stearate Nutrition 0.000 claims abstract description 42
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- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
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Abstract
Description
本出願は、2020年3月3日に出願された米国特許出願第16/807,272号の優先権の利益を主張し、その全内容は参照によりその全体が本明細書に組み込まれる。
(式1、ストークスの法則)
以下の実施例2~6に記載される組成物は、グリセリンおよび油を含む安定なエマルションを製造するための公知の方法には見られない急速冷却および任意選択の温度衝撃工程を利用する以下の方法を使用して製造された。
比較目的のために、本明細書中に記載されるほとんどの調合物は、表1に示される一般的処方に従って製造された(すなわち、「調合物A」を使用する)。表2は、従来の乳化剤を含む調合物Aによる油中グリセリン型エマルションの安定性を示す。上記のように、公知の方法に従って製造された油中グリセリン型エマルションは不安定であると考えられる。複数の乳化剤および4.7~15.5の範囲の親水性-親油性バランス(HLB)値を使用して試験した調合物は全て不安定であった。実施例1~7に具体化された調合物はいずれも化粧品用途に不向きであろう。
表4に示すように、ステアリン酸カルシウム、ステアリン酸亜鉛、ステアリン酸ナトリウムおよびパルミチン酸マグネシウムを含む、異なる石鹸を使用する複数の調合物もステアリン酸マグネシウムに対する安定性について試験した。試験した調合物、すなわち実施例13~16は全て、様々な塩が乳化剤として作用しなかったため不安定であった。実施例12で使用したステアリン酸マグネシウムは、安定なピッカリング型の油中グリセリン型エマルションおよびグリセリン中油型エマルションを製造することができる唯一の塩であることが分かった。安定性は、60℃で48時間後および室温で約6ヶ月後に測定した。いずれの場合も分離は観察されなかった。
表5に示すように、唯一の乳化剤としてステアリン酸マグネシウムおよび追加の増粘剤を使用する調合物も安定性について調査した。全ての例において、連続相に増粘剤を添加した結果、調合物は60℃で試験した安定性が増加した。
内相のグリセリンに水を添加することも、この変数が安定性に影響を及ぼすか否かを評価するために調査した。表5の実施例18では、グリセリンの5%を蒸留水に置き換え通常通り調製した。水の添加の結果、エマルションの粘稠度がわずかに増加し、かつ安定性がわずかに増大し、60℃で測定したとき、水を添加しない調合物よりも数時間目視可能な分離がなかった。水の添加はグリセリン相の密度を減少させ、式1で強調されるようにストークス沈降の量を減少させるので、これは驚くべき結果ではない。
グリセリンが72%、マカダミアナッツ油が25%、およびステアリン酸マグネシウムが3%を占める基本調合物を使用して、グリセリン中油型調合物も調製した。この基本調合物を、実施例1に記載される方法を使用して調製したが、違いは、ステアリン酸マグネシウムを一定の剪断下でグリセリン相に添加し、続いてグリセリン相に油を添加したことである。他の工程の手順は全て同じであった。調合物は、油中グリセリン型調合物よりもはるかに安定であった。得られたエマルションは、非常に粘稠なゲルであり、60℃に1週間供した後もいかなる目視可能な相分離も示さなかった。この結果は、グリセリンの粘性に起因する可能性が高い。この実施形態では、グリセリンが連続相であるため、ストークスの式に従って、粘度が増加してエマルションの安定性を高める。
Claims (20)
- ピッカリング型エマルションであって、
前記エマルション全体の約15重量%~約30重量%の量のポリオールを含む、不連続な内相と、
前記エマルション全体の約55重量%~約85重量%の量の連続的な油である外相と、
ステアリン酸マグネシウムを含む乳化剤と、
を含むピッカリング型エマルション。 - 前記ポリオールが、エチレングリコール、プロピレングリコール、ブチレングリコール、ヘキシレングリコール、ソルビトール、およびジエチレングリコールからなる群から選択される、請求項1に記載のピッカリング型エマルション。
- 前記ポリオールがグリセリンである、請求項1に記載のピッカリング型エマルション。
- 共乳化剤としてオリーブ油脂肪酸ソルビタンをさらに含む、請求項1に記載のピッカリング型エマルション。
- 前記不連続な内相が、10~40μmの直径を有する球状液滴を含む、請求項1に記載のピッカリング型エマルション。
- 前記ステアリン酸マグネシウムが前記エマルション全体の1~3重量%の量で存在する、請求項1に記載のピッカリング型エマルション。
- 前記エマルション全体の1~3重量%の量のオリーブ油脂肪酸ソルビタンを共乳化剤としてさらに含む、請求項6に記載のピッカリング型エマルション。
- 前記エマルションが60℃で少なくとも48時間安定であり、目視可能な相分離を示さない、請求項7に記載のピッカリング型エマルション。
- 前記エマルションが室温で少なくとも6ヶ月間安定であり、目視可能な相分離を示さない、請求項7に記載のピッカリング型エマルション。
- 前記ステアリン酸マグネシウムが、前記不連続な内相と前記連続的な油である外相との間の界面に局在する、請求項1に記載のピッカリング型エマルション。
- ピッカリング型エマルションであって、
前記エマルション全体の約5重量%~約65重量%の量の油を含む、不連続な内相と、
前記エマルション全体の約35重量%~約95重量%の量の連続したポリオールである外相と、
ステアリン酸マグネシウムを含む乳化剤と、
を含むピッカリング型エマルション。 - 前記ポリオールが、エチレングリコール、プロピレングリコール、ブチレングリコール、ヘキシレングリコール、ソルビトール、およびジエチレングリコールからなる群から選択される、請求項11に記載のピッカリング型エマルション。
- 前記ポリオールがグリセリンである、請求項11に記載のピッカリング型エマルション。
- 共乳化剤としてオリーブ油脂肪酸ソルビタンをさらに含む、請求項11に記載のピッカリング型エマルション。
- 前記不連続な内相が、10~40μmの直径を有する球状液滴を含む、請求項11に記載のピッカリング型エマルション。
- 前記ステアリン酸マグネシウムが、前記エマルション全体の1~3重量%の量で存在する、請求項11に記載のピッカリング型エマルション。
- 前記エマルション全体の1~3重量%の量のオリーブ油脂肪酸ソルビタンを共乳化剤としてさらに含む、請求項16に記載のピッカリング型エマルション。
- 前記エマルションが60℃で少なくとも48時間安定であり、目視可能な相分離を示さない、請求項17に記載のピッカリング型エマルション。
- 前記エマルションが室温で少なくとも6ヶ月間安定であり、目視可能な相分離を示さない、請求項18に記載のピッカリング型エマルション。
- 前記ステアリン酸マグネシウムが、前記不連続な内相と前記連続したポリオールである外相との間の界面に位置する、請求項11に記載のピッカリング型エマルション。
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