JP2022509948A - Uva領域にて光を吸収する日焼け止め組成物、及びその製造方法 - Google Patents
Uva領域にて光を吸収する日焼け止め組成物、及びその製造方法 Download PDFInfo
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- JP2022509948A JP2022509948A JP2021527108A JP2021527108A JP2022509948A JP 2022509948 A JP2022509948 A JP 2022509948A JP 2021527108 A JP2021527108 A JP 2021527108A JP 2021527108 A JP2021527108 A JP 2021527108A JP 2022509948 A JP2022509948 A JP 2022509948A
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- cerium oxide
- oxide particles
- sunscreen
- cerium
- particles
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Abstract
Description
本発明による日焼け止め組成物の製造のために、酸化セリウム粒子を製造した。
酸化セリウム前駆体でもって硝酸セリウム(cerium nitrate)を上向き方式(Bottom up)にて、化学的合成方法である水熱反応により粒子を成長させた。前記硝酸セリウム100重量部、及び硝酸セリウム100重量部を基準として、脱イオン水500重量部と混合して撹拌しながら、アンモニア水200重量部を添加し、pHが10になっている前駆体溶液を製造した。前記前駆体溶液を水熱合成器に入れ、180℃で24時間の間、反応させて酸化セリウム粒子を製造した。前記粒子を遠心分離して未反応物を除去した。前記未反応物が除去された酸化セリウム粒子は、一次粒子径が14.1nmであった。
脱イオン水2,500gにpH調節剤(硝酸等)50gを添加した後、撹拌した。前記製造された溶液に、前記ステップ1で製造した酸化セリウム粒子2,000gを添加した後、ビーズミル装備によるミリング(摩砕)を行って、水分散された酸化セリウム分散液を得た。ここで、前記得られた酸化セリウム粒子の二次粒子径の分布を図2に示したのであり、平均の二次粒子径は、41.59nmであった。また、前記得られた水分散された酸化セリウム粒子の分散液の写真を図3aに示した。
前記製造例で製造した水分散された酸化セリウム粒子の分散液溶液(54.55wt%)、シリコーンオイル(DC245,10wt%)、繊維剤(VGL silk、10wt%)、PEGシリコーン乳化剤(KF6017、3wt%)、ノニオン性W/О乳化剤(Abil em90、2.5wt%)、保湿剤(1,2-ヘキサンジオール、2wt%)、可塑剤(DPG、10wt%)、及び精製水(7.95wt%)を混合して日焼け止め組成物を製造した。
一般の酸化セリウム粒子を含む日焼け止め組成物を、下記のような方法で製造した。
水酸化セリウム、酸化セリウム、炭酸セリウム、硝酸セリウム、塩化セリウム、及び硝酸アンモニウムセリウムのうちの1種をるつぼ容器に入れ、加熱炉で400~1200℃の熱処理により、酸化セリウム粒子を得た。
脱イオン水2,500gにpH調節剤(硝酸等)50gを添加した後、撹拌させた。前記製造された溶液に、前記ステップ1で製造した一般の酸化セリウム粒子2,000gを添加した後、ビーズミル装備によるミリングを行って、水分散された一般の酸化セリウム分散液を得た。ここで、前記得られた水分散された一般の酸化セリウム粒子の分散液の写真を図3bに示した。
前記ステップ2で製造した水分散された一般の酸化セリウム粒子の分散液溶液(54.55wt%)、シリコーンオイル(DC245,10wt%)、繊維剤(VGL silk、10wt%)、PEGシリコーン乳化剤(KF6017、3wt%)、ノニオン性W/О乳化剤(Abil em90、2.5wt%)、保湿剤(1,2-ヘキサンジオール、2wt%)、可塑剤(DPG、10wt%)、及び精製水(7.95wt%)を混合して日焼け止め組成物を製造した。ここで、製造された一般の酸化セリウム粒子の平均の二次粒子径は、150nmであった。
酸化セリウム粒子を含まない通常に用いられる日焼け止め組成物を用意した。
前記製造例で製造した水分散された酸化セリウム粒子の分散液及び比較例1の一般の酸化セリウム粒子を含む分散液の吸収される光の波長領域を紫外可視分光法(UV-Vis(ultraviolet-visible) spectrophotometry)で分析したのであり、その結果を図4に示した。
前記比較例2及び実施例における日焼け止め組成物の紫外線防御指数(SPF;Sun Protection Factor)及びPA指数(Protection grade of UVA;UV-A 防御指数)を測定するために、イギリスのレーザーコンポーネンツ社のSPF analyser 290Sを用いてSPF及びPAを測定し、その結果を下記の表1に示す。
Claims (13)
- 320nm乃至400nm波長帯の光を吸収する酸化セリウム粒子を含むUVA領域において光を吸収する日焼け止め組成物。
- 前記酸化セリウム(CeO2)は、一次粒子径が10乃至30nmであり、二次粒子径が30乃至60nmであり、
一次粒子径に対する二次粒子径の割合が1乃至6である請求項1に記載のUVA領域において光を吸収する日焼け止め組成物。 - 前記酸化セリウム粒子の含量は、全体の日焼け止め組成物100重量部に対して5重量部乃至30重量部である請求項1に記載のUVA領域において光を吸収する日焼け止め組成物。
- 水酸化セリウム(cerium hydroxide)、酸化セリウム(cerium oxide)、炭酸セリウム(cerium carbonate)、硝酸セリウム(cerium nitrate)、塩化セリウム(cerium chloride)、硝酸アンモニウムセリウム(ammonium cerium nitrate)、及びこれらの組み合わせからなる群から選ばれるセリウム前駆体物質を用意するステップと、
前記セリウム前駆体物質に第四級アンモニウム系物質を添加するステップと、
前記アンモニウム系物質が添加された混合物を反応させて、酸化セリウム(CeO2)粒子を得るステップと、を含むUVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法。 - 前記第四級アンモニウム系物質は、水酸化アンモニウム、水酸化テトラメチルアンモニウム、水酸化テトラエチルアンモニウム、塩化テトラメチルアンモニウム、臭化テトラブチルアンモニウム、フッ化テトラブチルアンモニウム、水酸化ベンジルトリメチルアンモニウム、及びこれらの組み合わせからなる群から選ばれる物質を含むものである請求項4に記載のUVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法。
- 前記前駆体物質の粒子及び第四級アンモニウム系物質の重量混合割合は、1:1乃至3であるものである請求項4に記載のUVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法。
- 前記反応は、ゾル-ゲル法(sol-gel method)、超臨界流体工程、水熱合成法、または共沈法によって行われるものである請求項4に記載のUVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法。
- 前記酸化セリウム(CeO2)粒子を得るステップは、100℃乃至240℃の温度で18時間乃至30時間の間反応させて行われるものである請求項4に記載のUVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法。
- 前記酸化セリウム(CeO2)粒子を得るステップにおいて得られた酸化セリウム粒子の一次粒子径は、10乃至30nmであるものである請求項4に記載のUVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法。
- 前記UVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法は、前記酸化セリウム(CeO2)粒子を得るステップ以後に、前記得られた酸化セリウム粒子の未反応物を除去するステップをさらに含むものである請求項4に記載のUVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法。
- 前記UVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法は、前記酸化セリウム(CeO2)粒子を得るステップの後に、前記酸化セリウム粒子(CeO2)を水相媒質に添加するステップと、
前記水相媒質をミリングするステップと、をさらに含むものである請求項4に記載のUVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法。 - 前記水相媒質をミリングするステップの後に得られた酸化セリウム粒子の二次粒子径は、30乃至60nmである請求項11に記載のUVA領域において光を吸収する日焼け止め用酸化セリウム粒子の製造方法。
- 請求項11に記載の水相媒質をミリングするステップ以後に、前記水相媒質をシリコーンオイル、繊維剤、乳化剤、保湿剤、可塑剤、精製水、及びこれらの組み合わせからなる群から選ばれる物質と混合するステップを含むものであるUVA領域において光を吸収する日焼け止め組成物の製造方法。
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