JP2014214146A - 紫外線遮蔽剤 - Google Patents
紫外線遮蔽剤 Download PDFInfo
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- JP2014214146A JP2014214146A JP2013095218A JP2013095218A JP2014214146A JP 2014214146 A JP2014214146 A JP 2014214146A JP 2013095218 A JP2013095218 A JP 2013095218A JP 2013095218 A JP2013095218 A JP 2013095218A JP 2014214146 A JP2014214146 A JP 2014214146A
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- emulsion
- powder
- scallop shell
- oil
- ultraviolet
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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
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/04—Dispersions; Emulsions
- A61K8/06—Emulsions
-
- 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
- A61K8/96—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution
- A61K8/98—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution of animal origin
-
- 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
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Birds (AREA)
- Epidemiology (AREA)
- Zoology (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
【解決手段】ホタテ貝殻に焼成処理を行うことなく得られた比表面積が1.5〜50m2/gであるホタテ貝殻粉体を含む紫外線遮蔽剤およびホタテ貝殻粉体を乳化剤として使用した安定化したエマルションである紫外線遮蔽剤。
【選択図】図1
Description
ホタテ貝殻は、その高い硬度から、これまで、飼料、チョーク、骨材等に再利用されてきた(例えば、特許文献1参照)。また、ホタテ貝殻を構成する炭酸カルシウムは焼成処理によって水酸化カルシウムに変化し、水酸化カルシウムの強塩基性が高い抗菌性を与えることから、ホタテ貝殻粉体の抗菌組成物への利用も報告されている(特許文献2参照)。さらに、ホタテ貝殻に焼成・粉砕処理を施して得られた粉体は、皮膚への密着性、すべり感等の使用感、汗や皮脂の吸着性に優れていることから、当該粉体を配合した化粧崩れの少ない化粧料も報告されている(特許文献3参照)。同公報には、二酸化チタンをさらに配合したサンスクリーン化粧料も記載されている。
すなわち、(1)本発明は、ホタテ貝殻に焼成処理を行うことなく得られたホタテ貝殻粉体を含む紫外線遮蔽剤を提供する。
(2)本発明は、前記粉体の比表面積が1.5〜50m2/gである、(1)記載の紫外線遮蔽剤を提供する。
(3)本発明は、前記粉体の比表面積が30〜50m2/gである、(1)記載の紫外線遮蔽剤を提供する。
(4)本発明は、油水界面に、ホタテ貝殻に焼成処理を行うことなく得られたホタテ貝殻粉体が存在している水中油型エマルションであることを特徴とする、(1)〜(3)のいずれか1記載の紫外線遮蔽剤を提供する。
(5)本発明は、前記エマルションの平均粒径が20〜100μmである、(4)記載の紫外線遮蔽剤を提供する。
(6)本発明は、前記エマルションが、油剤と水とを体積比で1:99〜60:40で含み、かつ前記粉体を油剤及び水の全重量に対して0.5〜10重量%で含む、(4)又は(5)記載の紫外線遮蔽剤を提供する。
これらの油剤は、単独で又は2種以上を組み合わせて使用することができる。
下記表1に記載の北海道北見市常呂町産業振興公社製ホタテ貝殻粗粉(平均粒子径20 μm, 比表面積1.5 m2/g)と、ジルコニアボール(直径3 mm)とを、予め60℃で12時間乾燥した。
(1)水中油型エマルションの作製
蒸留水5 mLに参考例1で調製した粉体を2 wt%で配合・分散したものと、スクアラン(和光純薬工業株式会社、95.0%)5 mLとを、ホモジナイザー(10 mm dispersing toolを装着したIKA dispergierantrieb T-10 homogenizer)を用いて20000 rpmで2分間処理した。得られたエマルションは安定であり、5ヶ月後の解乳化率は1.0 %であった。なお、解乳化率は、エマルション形成に使用したスクワラン5 mLの重量に対し、一定期間後、解乳化しエマルション上層に形成されるスクワラン油層の重量の比をとることにより求めた(値は百分率として表示した)。図1は、得られたエマルションの光学顕微鏡画像を示しており、油水界面にホタテ貝殻粉末が吸着している様子を示している。このホタテ貝殻粉末の吸着が安定なエマルション形成をもたらしているものと考えられる。レーザー回折式粒子径分布測定装置(A Malvern Mastersizer 2000 instrument: a small volume Hydro 2000SM sample dispersion unit)で解析したエマルションの平均径は87 μmであり、標準偏差は47 μmであった。
(2)紫外線遮蔽率の測定
(1)で作製したエマルションの紫外線領域における遮蔽率の経時変化(0分、6時間)を測定した結果を、図2に、それぞれ実施例1−1、実施例1−2として示す。測定は分光光度計(島津製作所製、UV-2400PC)を用い、当該エマルションを石英セル(光路長10 mm)に3 mL投入してUVA(400〜320 nm)、UVB(320〜280 nm)の遮蔽率を測定した。
水3 mLに参考例1で調製した粉体を0.06 g投入して、超音波照射により分散処理を施すことによって組成物を得、当該組成物の紫外線領域における遮蔽率の経時変化を測定した結果を、比較例1−1、比較例1−2(0分、6時間)として図2に併せて示す。
実施例1の(1)で作製したエマルションを石英ガラス板に2 mg/cm2となるように塗布し、紫外線領域における遮蔽率を測定した。結果を図3に示す。測定は分光光度計(島津製作所製、UV-2400PC)を用い、UVA(400〜320 nm)、UVB(320〜280 nm)の遮蔽率を測定した。
参考例1で調製した粉体の代わりにドデシル硫酸ナトリウム(片山化学工業株式会社製、95.0%)5 mLを用いる以外は実施例1の(1)に記載の方法と同様にしてエマルションを調製した。
参考例1で調製したホタテ貝殻粉体の代わりに、炭酸カルシウム(比表面積:0.6 m2/g、純度>99.5%、ナカライテスク製)(比較例3)、焼成炭酸カルシウム(ナカライテスク製炭酸カルシウムを900℃で18時間焼成)(比較例4)、二酸化チタン(比表面積:10.7 m2/g、純度>98.5%、アナターゼ型、和光純薬製)(比較例5)を用いる以外は、実施例1の(1)に記載の方法と同様にしてエマルションを調製し、当該エマルションを石英セル(光路長10 mm)に3 mL投入し、静置6時間後の紫外線遮蔽率を測定した(図4)。
図4より明らかなように、参考例1で調製したホタテ貝殻粉体のエマルションは、市販の炭酸カルシウム及び紫外線遮蔽剤として周知な二酸化チタンと比較して、経時的に安定であるばかりでなく、高い紫外線遮蔽率を有することが分かった。
Claims (6)
- ホタテ貝殻に焼成処理を行うことなく得られたホタテ貝殻粉体を含む紫外線遮蔽剤。
- 前記粉体の比表面積が1.5〜50m2/gである、請求項1記載の紫外線遮蔽剤。
- 前記粉体の比表面積が30〜50m2/gである、請求項1記載の紫外線遮蔽剤。
- 油水界面に、ホタテ貝殻に焼成処理を行うことなく得られたホタテ貝殻粉体が存在している水中油型エマルションであることを特徴とする、請求項1〜3のいずれか1項記載の紫外線遮蔽剤。
- 前記エマルションの平均粒径が20〜100μmである、請求項4記載の紫外線遮蔽剤。
- 前記エマルションが、油剤と水とを体積比で1:99〜60:40で含み、かつ前記粉体を油剤及び水の全重量に対して0.5〜10重量%で含む、請求項4又は5記載の紫外線遮蔽剤。
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JP2016132665A (ja) * | 2015-01-15 | 2016-07-25 | 寅之介 窪田 | 発光水性ネイルトップコート |
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