JP3582936B2 - External preparation for skin - Google Patents

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JP3582936B2
JP3582936B2 JP20106796A JP20106796A JP3582936B2 JP 3582936 B2 JP3582936 B2 JP 3582936B2 JP 20106796 A JP20106796 A JP 20106796A JP 20106796 A JP20106796 A JP 20106796A JP 3582936 B2 JP3582936 B2 JP 3582936B2
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Japan
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skin
external preparation
xanthene
mixed
benzophenone
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JPH1025220A (en
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増美 竹井
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Noevir Co Ltd
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Noevir Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、光や酸化的ストレスによる傷害から有効に皮膚を防御し、またこれらに起因する皮膚疾患や皮膚の老化症状を治療又は予防することのできる皮膚外用剤に関する。さらに詳しくは、ヒドロキシル化キサンテン・ベンゾフェノン二量体の1種又は2種以上を含有して成る皮膚外用剤に関する。
【0002】
【従来の技術】
紫外線に過度に曝されたり、また紫外線や内在性酸素に起因する酸化的ストレスにより、皮膚において紅斑発生に始まり一連の炎症反応が惹起され、さらには皮下組織のコラーゲン線維の破壊による小じわの発生、しみ,そばかす等の色素沈着など、皮膚の老化が促進され、最悪の場合、腫瘍の発生することもある。近年、かかる紫外線や酸化的ストレスの皮膚に対する有害性が一般に認識されるようになり、紫外線の防止や活性酸素種の消去を目的とする皮膚外用剤や化粧料の需要が高まってきている。
【0003】
紫外線の防止には、紫外線吸収剤や紫外線を乱反射することにより遮蔽作用を示す酸化亜鉛や酸化チタン等の無機被覆剤が配合されている。紫外線吸収剤としては、パラジメチルアミノ安息香酸2−エチルヘキシル等のパラアミノ安息香酸(PABA)系、パラメトキシ桂皮酸2−エチルヘキシル等の桂皮酸エステル系、4−t−ブチル−4’−メトキシジベンゾイルメタン等のジベンゾイルメタン系、2−ヒドロキシ−4−メトキシベンゾフェノン等のベンゾフェノン系などの他、種々の化合物が用いられているが、これらの中には接触皮膚炎,光接触皮膚炎の発生や、感作性或いは累積刺激性が報告されているものがある。また、紫外線の防止を目的とする皮膚外用剤においては、水や汗に対する耐水性と皮脂等に対する耐油性の双方が要求されるのであるが、特にエステル系のものでは耐油性が悪いという欠点があった。
【0004】
一方、紫外線乱反射作用を有する酸化亜鉛,酸化チタン等の無機被覆剤は、十分な被覆性を得るにはかなりの量を配合しなければならず、隠蔽力が高くなり過ぎて塗布した際に不自然な白っぽさを生じたり、粉浮きの発生等化粧持ちが悪くなるといった問題を生じていた。
【0005】
また活性酸素種の消去剤としては、ビタミンE類やグルタチオン,スーパーオキシドディスムターゼ等が用いられ、これらの他に活性酸素種消去作用を有する植物抽出物も報告されている。しかしながら、従来用いられてきた上記の成分には光や熱等に対して不安定なものが多く、作用,効果も不十分で、外用剤基剤に配合して十分な効果を得るには、かなりの多量を要することが多かった。さらに、特に植物抽出物等の天然物基原のものについては、一定の品質のものを確保することが困難であった。
【0006】
【発明が解決しようとする課題】
本発明は上記のような問題点の解消を図り、非常に優れた紫外線防止効果及び活性酸素種消去作用を有し、光や酸化的ストレスによる傷害から有効に皮膚を防御し、またこれらに起因する皮膚疾患や皮膚の老化症状を治療又は予防することができ、しかも安定性及び安全性に優れる皮膚外用剤を得ることを目的とする。
【0007】
【課題を解決するための手段】
上記の課題を解決するべく種々検討を行ったところ、ヒドロキシル化キサンテン類とベンゾフェノン類より形成される二量体が、優れた紫外線吸収能と活性酸素種消去作用とを合わせ持つことを見い出し、これを皮膚外用剤に含有させた場合、非常に低濃度で優れた効果が得られ、しかも製剤安定性及び皮膚に対する安全性にも優れることが明らかとなった。
【0008】
すなわち本発明は、ヒドロキシル化キサンテン・ベンゾフェノン二量体より1種又は2種以上を選択して、外用剤基剤に含有させて成る。かかるヒドロキシル化キサンテン・ベンゾフェノン二量体は、オトギリソウ科植物等に含まれているヒドロキシル化キサントン・ベンゾフェノン二量体を還元したり、或いはカルボニル炭素にアルキル基,アルケニル基又はアリール基を導入することにより得ることができる。出発物質とするヒドロキシル化キサントン・ベンゾフェノン二量体は、オトギリソウ科等の植物抽出物より、たとえば飯沼らの方法(日本薬学会第116年会講演要旨集2第177ページ)に従い、シリカゲルカラムクロマトグラフィー,セファデックスLH−20カラムクロマトグラフィー及び再結晶により単離精製することができる。
【0009】
また、キサンテンよりキサンテニル基を誘導し、ヒドロキシル基を求核置換反応により導入した後、これをベンゾフェノン類に導入して得ることもできる。
【0010】
ヒドロキシル化キサンテン・ベンゾフェノン二量体を構成するヒドロキシル化キサンテンとしては、活性酸素種消去作用及び安全性を考慮した場合、キサンテン−2,7−ジオール類が好ましい。なお、キサンテン−2,7−ジオール類の抗酸化能を利用した皮膚外用剤については、既に開示している(特開平7−215833)。
【0011】
一方ベンゾフェノン類としては、紫外線吸収能及び安全性の面から、2−ヒドロキシ−4−メトキシベンゾフェノン,2−ヒドロキシ−4−メトキシベンゾフェノン−5−スルホン酸及びその塩,ジヒドロキシジメトキシベンゾフェノン,ジヒドロキシジメトキシベンゾフェノン−スルホン酸及びその塩,2,4−ジヒドロキシベンゾフェノン及びテトラヒドロキシベンゾフェノンより選択することが好ましい。
【0012】
上記したヒドロキシル化キサンテン・ベンゾフェノン二量体の例として、化学式1〜化学式3に示すようなキサンテン−2,7−ジオール・2−ヒドロキシ−4−メトキシベンゾフェノン二量体等が挙げられる。本発明では、ヒドロキシル化キサンテン・ベンゾフェノン二量体としては、反応生成後得られる何種類かの異性体混合物の状態で用いた。
【化1】

Figure 0003582936
【化2】
Figure 0003582936
【化3】
Figure 0003582936
【0013】
外用剤基剤への配合は、ヒドロキシル化キサンテンがエタノール,プロパノール,イソプロパノールといった低級アルコール類、グリセリン,プロピレングリコール,ジプロピレングリコール,1,3−ブチレングリコールといった多価アルコール等に可溶性であるため、これらに溶解させて行うことが好ましい。また、マイクロカプセル化或いはリポソーム化して配合してもよい。配合量としては、基剤や期待する効果の程度によって異なるが、0.0001〜5.0重量%程度が適当である。
【0014】
なお、本発明においてはさらに、他の活性酸素種消去剤や抗炎症剤、美白剤、殺菌剤、油類、保湿剤、紫外線吸収剤、香料、防腐剤等、一般的な外用剤及び化粧料用原料をも含有させることができる。
【0015】
【作用】
本発明による皮膚外用剤は、優れた紫外線防止能及び活性酸素種消去作用を有するため、光や酸化的ストレスに起因する傷害から皮膚を防御し、これらにより生じる皮膚疾患や皮膚の老化症状,色素沈着症状等の改善,治療及び防止に有効である。また、毛髪に対して使用すると、紫外線等による毛髪の損傷を改善及び防止し、健やかで美しい毛髪を保つことができる。
【0016】
また、本発明において有効成分として含有させるヒドロキシル化キサンテン・ベンゾフェノン二量体は安定性が良好で、細胞毒性も低く、低濃度で十分な効果を得ることができるため、従来の紫外線吸収剤において見られた皮膚刺激性や皮膚感作性といった安全性上の問題点や、耐水性,耐油性の悪さを良好に改善することができる。さらに、長波長域紫外線(UVA)及び中波長域紫外線(UVB)の両方において良好な吸収を示すため、紫外線による紅斑及び遅延黒化の双方を効率よく防御できる。
【0017】
【発明の実施の形態】
本発明は、ローション剤,乳剤,ゲル剤,クリーム,軟膏等の剤型の皮膚外用剤として提供することができる。また、化粧水,乳液,クリーム等の皮膚の老化防止用化粧料、或いはメイクアップベースローション,メイクアップベースクリーム,液状,クリーム状,軟膏型又は粉体状のファンデーション等の形態の日焼け止め化粧料、シャンプー,リンス,ヘアートリートメント等の毛髪用化粧料、ハンドクリーム,レッグクリーム,ボディローション等の身体用化粧料などとしても提供され得る。
【0018】
【実施例】
さらに本発明について、実施例により詳細に説明する。
【0019】
Figure 0003582936
製法:(1),(2)を(4)に溶解し、次いで(3)を添加して均一に分散させる。
【0020】
Figure 0003582936
製法:(1)〜(7)の油相成分を混合,加熱して均一に溶解し、70℃に保つ。一方、(8)〜(11)の水相成分を混合,加熱して均一とし、70℃とする。この水相成分に前記油相成分を攪拌しながら徐々に添加して乳化し、冷却する。
【0021】
Figure 0003582936
製法:(6)に(2)を均一に溶解させた後、(1)に(4),(5)を溶解させて添加し、次いで(3)を加えて増粘させ、(7)を添加,混合する。
【0022】
Figure 0003582936
製法:(1)〜(9)の油相成分を混合,溶解して75℃に加熱する。一方、(10)〜(12)の水相成分を混合,溶解して75℃に加熱する。次いで、上記水相成分に油相成分を添加して予備乳化した後、ホモミキサーにて均一に乳化し、冷却後40℃にて(13)を添加,混合する。
【0023】
Figure 0003582936
製法:(1)〜(3)の油相成分を混合,溶解して均一とし、75℃に加熱する。一方、(4)〜(8)の水相成分を混合,溶解して75℃に加熱し、これに前記油相成分を添加して乳化し、冷却後40℃にて(9)を添加,混合する。
【0024】
Figure 0003582936
製法:(1)に(3)を溶解して(2),(4)とともに(5)に添加して均一に混合,溶解する。
【0025】
Figure 0003582936
製法:(5),(6)を(10)の一部に溶解して50℃とし、50℃に加熱した(4)に攪拌しながら徐々に添加する。これをあらかじめ混合し70℃に加熱溶解した(1)〜(3)に均一に分散し、これに(7),(8),(9)を(10)の残部に溶解して70℃に加熱したものを攪拌しながら添加し、ホモミキサーにて乳化する。冷却後、40℃にて(11)を添加,混合する。
【0026】
Figure 0003582936
製法:(1)〜(5)の油相成分を混合し、75℃に加熱して均一とする。一方(6)〜(9)の水相成分を混合し、75℃に加熱,溶解して均一とし、これに(10)〜(12)の顔料を添加し、ホモミキサーにて均一に分散させる。この水相成分に前記油相成分を添加し、ホモミキサーにて乳化した後冷却し、40℃にて(13)を添加,混合する。
【0027】
Figure 0003582936
製法:(1)〜(6)の油相成分を混合し、75℃に加熱して均一とする。一方(7)〜(10)の水相成分を混合し、75℃に加熱,溶解して均一とし、これに(11)〜(15)の顔料を添加し、ホモミキサーにて均一に分散させる。この水相成分に前記油相成分を添加し、ホモミキサーにて乳化した後冷却し、40℃にて(16)を添加,混合する。
【0028】
Figure 0003582936
製法:(1)〜(7)の顔料成分を混合し、粉砕機を通して粉砕する。これを高速ブレンダーに移し、(8)〜(13)を混合して添加し、均一に混合する。これを粉砕機で処理し、ふるいを通し粒度をそろえた後、金皿に圧縮成型する。
【0029】
Figure 0003582936
製法:(1)〜(6)を順次(7)に添加して均一とする。
【0030】
Figure 0003582936
製法:(4)〜(7)の水相成分を混合,溶解し、70℃に加熱する。一方、(1)〜(3)の油相成分を混合,溶解し、70℃に加熱する。この油相を攪拌しながら前記水相に徐々に添加して予備乳化し、ホモミキサーにより均一とした後冷却し、40℃にて(8)を添加,混合する。
【0031】
Figure 0003582936
製法:(1)〜(10)の各成分を順次添加混合して均一とする。
【0032】
上記実施例のうち、実施例1〜実施例5について、老化防止効果,肌荒れ改善効果を評価した。その際、各実施例において、ヒドロキシル化キサンテン・ベンゾフェノン二量体をそれぞれ二量体の構成成分に相当するベンゾフェノン類に代替して比較例1〜比較例5とし、同様に評価を行った。
【0033】
まず、皮膚の老化防止効果は、ヘアレスマウスにおけるしわの発生に対する抑制効果の評価により行った。前記評価は、ヘアレスマウス5匹を1群とし、各群について実施例及び比較例をそれぞれ1日1回背部に塗布し、1J/cm/週の長波長域紫外線(UVA)を50週間照射し、ヘアレスマウス背部皮膚におけるしわの発生状況を観察し、表1に示す判定基準に従って点数化して行った。この際、精製水のみを塗布した群を対照とした。結果は、各群の平均値を算出し、UVA照射日数との関係により表2に示した。
【表1】
Figure 0003582936
【0034】
次に肌荒れに対する改善効果は、顕著な肌荒れ症状を有する女性パネラー20名を1群とし、各群に実施例及び比較例のそれぞれを1日2回、ブラインドにて1カ月間連続使用させ、1カ月後の皮膚の症状を観察して、使用開始前と比較して行った。皮膚の肌荒れ症状は表3に示す判定基準に従って点数化し、20名の平均値を算出し、表4に示した。
【表3】
Figure 0003582936
【0035】
【表2】
Figure 0003582936
表2において、対照群では50週後にはほとんどのヘアレスマウスに深いしわの発生が認められているが、本発明の実施例塗布群では、いずれにおいてもしわの発生は顕著に抑制されており、50週後に微小なしわの発生を認めた程度であった。これに対し、単にベンゾフェノン類のみを含有する比較例塗布群では、いずれにおいてもしわの発生の抑制傾向は認められるものの、その抑制の程度はいたって小さく、老化防止効果を有するビタミン類である酢酸トコフェロール等を含有する比較例2〜比較例5塗布群においても、十分なしわの発生抑制は認められていなかった。
【0036】
【表4】
Figure 0003582936
次に表4より、本発明の実施例使用群においてはいずれも良好な肌荒れ症状の改善が認められ、ほぼ良好な皮膚状態にまで回復していることが示されている。これに対し、比較例1使用群では肌荒れの改善はあまり認められず、比較例2〜比較例5使用群でも、皮膚状態の回復は不十分であった。
【0037】
実施例8〜実施例10の日焼け止め化粧料については、日焼け防止効果の評価を行った。日焼け防止効果の評価は、Sun Protection Factor(SPF)とUVA防御指数の測定により行った。この際にも、各実施例においてヒドロキシル化キサンテン・ベンゾフェノン二量体をそれぞれ対応するベンゾフェノン類に代替したものを比較例8〜比較例10とし、同時に評価を行った。
【0038】
SPFは、光源としてキセノンアークソーラーシミュレーターを用い、スキンタイプI〜IIIの成人男子20名を被験者として、あらかじめ試料未塗布部の最小紅斑量(MED)を求めた後、試料の予想SPF値以上の照射を公比1.3で5段階で行い、試料塗布部のMEDを求め、試料塗布部の値を試料未塗布部の値で除してSPFを算出し、各被験者の平均値により表した。
【0039】
一方、UVA防御指数は、光源としてキセノンアークソーラーシミュレーターを用い、スキンタイプIII及びIVの成人男子20名を被験者として、あらかじめ試料未塗布部の最小即時型黒化量(MIPD)を求めた後、試料の予想防御指数値以上の照射を公比1.25で5段階で行い、試料塗布部のMIPDを求め、試料塗布部の値を試料未塗布部の値で除して防御指数を算出し、各被験者の平均値により表した。
【0040】
さらに、各試料を塗布した後、気温30℃,湿度75%の環境下で2時間運動させた後のSPF値及びUVA防御指数を上記と同様にして求め、これらの結果を表5に併せて示した。
【0041】
【表5】
Figure 0003582936
表5において明らかなように、本発明の実施例はいずれも各比較例に比べて有意に高いSPF値及びUVA防御指数を示している。そして、高温多湿の環境下に2時間運動させた後においても、本発明の実施例はいずれも良好なSPF値及びUVA防御指数を維持していた。これに対し、比較例では2時間運動後のSPF値,UVA防御指数の低下が認められ、特にクリーム及び乳液状の剤型である比較例8と比較例9では、著しい低下が認められた。
【0042】
また、実施例8〜実施例10及び比較例8〜比較例10について、皮膚刺激性を評価した。皮膚刺激性は成人男性30名をパネラーとして、背部皮膚にて48時間の閉塞貼付試験を行い、その結果を表6に示す判定基準に従って判定し、30名の皮膚刺激指数の平均値を算出した。結果は表7に示した。
【表6】
Figure 0003582936
【0043】
【表7】
Figure 0003582936
表7において、本発明の実施例はいずれも0.03〜0.10と非常に低い皮膚刺激指数を示し、問題となる接触皮膚刺激性及び皮膚感作性は認められなかった。これに対して、各比較例では若干の皮膚刺激性が認められていた。
【0044】
続いて実施例11及び実施例12について、毛髪の紫外線による損傷に対する防御作用を評価した。その際、各実施例においてヒドロキシル化キサンテン・ベンゾフェノン二量体をそれぞれ対応するベンゾフェノンに代替したものを比較例11及び比較例12とした。損傷のない毛髪束を各試料液中に5分間浸漬した後、軽く水洗して乾燥し、サンテスターを用いて174kJ,290〜390nmの紫外線を4時間照射した後、日立製走査型電子顕微鏡にて毛髪の状態を観察した。毛髪の状態は表8に示す判定基準に従って点数化した。各試料に浸漬処理した場合と水洗のみを行って紫外線照射した対照について、それぞれ3種の毛髪束を用いて評価を行い、各毛髪束についての評価点の平均値にて表9に示した。
【表8】
Figure 0003582936
【0045】
【表9】
Figure 0003582936
表9より明らかなように、紫外線照射により、対照の毛髪束では著しいキューティクルの剥離が全体的に認められたが、本発明の実施例により処理した場合には、わずかにキューティクルの剥離が認められる程度であり、毛髪が紫外線による損傷から有効に防御されることが示された。これに対し、比較例により処理した場合には、紫外線による損傷に対する防御効果は小さく、不十分であった。
【0046】
【発明の効果】
以上詳述したように、本発明により、光や酸化的ストレスによる傷害から有効に皮膚を防御し、これらに起因する皮膚疾患や皮膚の老化症状を治療又は予防することができ、しかも安定性及び安全性に優れる皮膚外用剤を得ることができた。また、良好な紫外線防御効果を有し、日焼けによる炎症や黒化、及び毛髪の紫外線による損傷を良好に防止し得る化粧料を得ることができた。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a skin external preparation capable of effectively protecting the skin from damage caused by light and oxidative stress, and treating or preventing skin diseases and aging symptoms of the skin caused by the damage. More specifically, the present invention relates to an external preparation for skin comprising one or more hydroxylated xanthene / benzophenone dimers.
[0002]
[Prior art]
Excessive exposure to ultraviolet light and oxidative stress caused by ultraviolet light and endogenous oxygen cause erythema to occur in the skin, causing a series of inflammatory reactions. Aging of the skin such as pigmentation such as spots and freckles is promoted, and in the worst case, a tumor may develop. In recent years, the harmful effects of ultraviolet rays and oxidative stress on the skin have been generally recognized, and the demand for external skin preparations and cosmetics for the purpose of preventing ultraviolet rays and eliminating active oxygen species has been increasing.
[0003]
In order to prevent ultraviolet rays, an ultraviolet absorbent or an inorganic coating agent such as zinc oxide or titanium oxide which has a shielding effect by irregularly reflecting ultraviolet rays is blended. Examples of the ultraviolet absorber include paraaminobenzoic acid (PABA) such as 2-ethylhexyl paradimethylaminobenzoate, cinnamate esters such as 2-ethylhexyl paramethoxycinnamate, and 4-t-butyl-4'-methoxydibenzoylmethane Various compounds are used in addition to dibenzoylmethanes such as dibenzoylmethane, benzophenones such as 2-hydroxy-4-methoxybenzophenone, etc. Among them, contact dermatitis and light contact dermatitis occur. Some have reported sensitization or cumulative irritation. In addition, a skin external preparation for the purpose of preventing ultraviolet rays is required to have both water resistance to water and sweat and oil resistance to sebum and the like. there were.
[0004]
On the other hand, inorganic coating agents such as zinc oxide and titanium oxide, which have an irregular reflection function of ultraviolet rays, must be incorporated in a considerable amount in order to obtain sufficient coating properties. There have been problems such as the occurrence of natural whiteness, the occurrence of powder floating, and the deterioration of makeup durability.
[0005]
Vitamin Es, glutathione, superoxide dismutase, and the like are used as active oxygen species scavengers, and plant extracts having a reactive oxygen species scavenging action have also been reported. However, many of the above-mentioned components which have been conventionally used are unstable to light or heat, and their functions and effects are insufficient. In order to obtain a sufficient effect by blending with an external preparation base, It often required a considerable amount. Furthermore, it has been difficult to secure a certain quality, especially for those derived from natural products such as plant extracts.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems, has an extremely excellent ultraviolet ray preventing effect and a reactive oxygen species eliminating effect, effectively protects the skin from damage caused by light and oxidative stress, and is caused by these. An object of the present invention is to provide a skin external preparation that can treat or prevent skin diseases and aging symptoms of the skin, and that is excellent in stability and safety.
[0007]
[Means for Solving the Problems]
After conducting various studies to solve the above problems, it was found that a dimer formed from hydroxylated xanthenes and benzophenones had both excellent ultraviolet absorbing ability and active oxygen species elimination action. It was clarified that, when incorporated into an external preparation for skin, an excellent effect was obtained at a very low concentration, and the preparation stability and safety on the skin were also excellent.
[0008]
That is, in the present invention, one or more kinds of hydroxylated xanthene / benzophenone dimers are selected and contained in an external preparation base. Such a hydroxylated xanthene / benzophenone dimer can be obtained by reducing a hydroxylated xanthone / benzophenone dimer contained in a Hypericum plant or by introducing an alkyl group, an alkenyl group or an aryl group into the carbonyl carbon. Obtainable. The hydroxylated xanthone-benzophenone dimer as a starting material can be obtained from a plant extract such as St. John's wort by, for example, silica gel column chromatography according to the method of Iinuma et al. And Sephadex LH-20 column chromatography and recrystallization.
[0009]
Alternatively, a xanthenyl group can be derived from xanthene, a hydroxyl group can be introduced by a nucleophilic substitution reaction, and then introduced into a benzophenone.
[0010]
As the hydroxylated xanthene constituting the hydroxylated xanthene-benzophenone dimer, xanthene-2,7-diols are preferable in consideration of the elimination effect of active oxygen species and safety. A skin external preparation utilizing the antioxidant ability of xanthene-2,7-diols has already been disclosed (JP-A-7-215833).
[0011]
On the other hand, benzophenones include 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and salts thereof, dihydroxydimethoxybenzophenone, and dihydroxydimethoxybenzophenone in terms of ultraviolet absorbing ability and safety. It is preferred to select from sulfonic acids and their salts, 2,4-dihydroxybenzophenone and tetrahydroxybenzophenone.
[0012]
Examples of the above-mentioned hydroxylated xanthene / benzophenone dimer include xanthene-2,7-diol / 2-hydroxy-4-methoxybenzophenone dimer as shown in Chemical Formulas 1 to 3. In the present invention, the hydroxylated xanthene / benzophenone dimer was used in the form of a mixture of several isomers obtained after the reaction.
Embedded image
Figure 0003582936
Embedded image
Figure 0003582936
Embedded image
Figure 0003582936
[0013]
Formulation in the external preparation base is because hydroxylated xanthene is soluble in lower alcohols such as ethanol, propanol and isopropanol, and polyhydric alcohols such as glycerin, propylene glycol, dipropylene glycol and 1,3-butylene glycol. It is preferable to carry out by dissolving in Moreover, you may mix | blend in microcapsule or a liposome. The blending amount varies depending on the base and the degree of the expected effect, but is preferably about 0.0001 to 5.0% by weight.
[0014]
In the present invention, general external preparations and cosmetics such as other active oxygen species elimination agents, anti-inflammatory agents, whitening agents, bactericides, oils, humectants, ultraviolet absorbers, fragrances, preservatives, etc. Raw materials for use can also be included.
[0015]
[Action]
Since the external preparation for skin according to the present invention has an excellent ultraviolet ray preventing ability and an active oxygen species elimination action, it protects the skin from injuries caused by light and oxidative stress, and causes skin diseases, aging symptoms and pigments caused by these. It is effective for improving, treating, and preventing deposition symptoms. Moreover, when used for hair, damage to the hair due to ultraviolet rays or the like can be improved and prevented, and healthy and beautiful hair can be maintained.
[0016]
Further, the hydroxylated xanthene / benzophenone dimer contained as an active ingredient in the present invention has good stability, low cytotoxicity, and a sufficient effect can be obtained at a low concentration. It can satisfactorily improve safety problems such as skin irritation and skin sensitization, and poor water resistance and oil resistance. Furthermore, since it shows good absorption in both long-wavelength ultraviolet rays (UVA) and mid-wavelength ultraviolet rays (UVB), it is possible to efficiently prevent both erythema and delayed blackening due to ultraviolet rays.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention can be provided as a skin external preparation in the form of a lotion, emulsion, gel, cream, ointment and the like. Further, cosmetics for preventing skin aging such as lotions, emulsions and creams, or sunscreen cosmetics in the form of makeup base lotions, makeup base creams, foundations in the form of liquids, creams, ointments or powders. , Shampoos, rinses, hair treatments and the like, and hair cosmetics such as hand creams, leg creams and body lotions.
[0018]
【Example】
Further, the present invention will be described in detail with reference to examples.
[0019]
Figure 0003582936
Production method: (1) and (2) are dissolved in (4), and then (3) is added and uniformly dispersed.
[0020]
Figure 0003582936
Production method: The oil phase components of (1) to (7) are mixed and heated to uniformly dissolve and kept at 70 ° C. On the other hand, the aqueous phase components (8) to (11) are mixed and heated to be uniform, and the temperature is set to 70 ° C. The oil phase component is gradually added to the aqueous phase component with stirring, emulsified, and cooled.
[0021]
Figure 0003582936
Production method: After (2) is uniformly dissolved in (6), (4) and (5) are dissolved and added to (1), and then (3) is added to increase the viscosity. Add and mix.
[0022]
Figure 0003582936
Production method: The oil phase components (1) to (9) are mixed and dissolved and heated to 75 ° C. On the other hand, the aqueous phase components (10) to (12) are mixed and dissolved, and heated to 75 ° C. Next, the oil phase component is added to the water phase component and pre-emulsified, and then uniformly emulsified by a homomixer. After cooling, (13) is added and mixed at 40 ° C.
[0023]
Figure 0003582936
Production method: The oil phase components (1) to (3) are mixed and dissolved to make uniform, and heated to 75 ° C. On the other hand, the aqueous phase components (4) to (8) were mixed and dissolved, heated to 75 ° C, and the oil phase component was added thereto to emulsify. After cooling, (9) was added at 40 ° C. Mix.
[0024]
Figure 0003582936
Production method: (3) is dissolved in (1), added to (5) together with (2) and (4), and uniformly mixed and dissolved.
[0025]
Figure 0003582936
Production method: (5) and (6) are dissolved in a portion of (10) to 50 ° C., and gradually added to (4) heated to 50 ° C. with stirring. This was previously mixed and uniformly dispersed in (1) to (3), which were heated and dissolved at 70 ° C., and (7), (8), and (9) were dissolved in the remainder of (10) and heated to 70 ° C. The heated product is added with stirring and emulsified with a homomixer. After cooling, (11) is added and mixed at 40 ° C.
[0026]
Figure 0003582936
Production method: The oil phase components (1) to (5) are mixed and heated to 75 ° C. to make uniform. On the other hand, the aqueous phase components (6) to (9) are mixed, heated to 75 ° C. and dissolved to make uniform, and the pigments (10) to (12) are added thereto and uniformly dispersed by a homomixer. . The oil phase component is added to the water phase component, emulsified by a homomixer, cooled, and (13) is added and mixed at 40 ° C.
[0027]
Figure 0003582936
Production method: The oil phase components of (1) to (6) are mixed and heated to 75 ° C. to make uniform. On the other hand, the aqueous phase components of (7) to (10) are mixed, heated to 75 ° C. and dissolved to make uniform, and the pigments of (11) to (15) are added thereto and uniformly dispersed by a homomixer. . The oil phase component is added to the water phase component, emulsified by a homomixer, cooled, and (16) is added and mixed at 40 ° C.
[0028]
Figure 0003582936
Production method: The pigment components (1) to (7) are mixed and pulverized through a pulverizer. This is transferred to a high-speed blender, and (8) to (13) are mixed and added, and mixed uniformly. This is processed by a pulverizer, passed through a sieve to make the particle size uniform, and then compression molded into a metal plate.
[0029]
Figure 0003582936
Production method: (1) to (6) are added sequentially to (7) to make it uniform.
[0030]
Figure 0003582936
Production method: The aqueous phase components (4) to (7) are mixed and dissolved, and heated to 70 ° C. On the other hand, the oil phase components (1) to (3) are mixed and dissolved, and heated to 70 ° C. The oil phase is gradually added to the aqueous phase while stirring, and pre-emulsified. The mixture is homogenized by a homomixer, cooled, and (8) is added and mixed at 40 ° C.
[0031]
Figure 0003582936
Production method: Each component of (1) to (10) is added and mixed sequentially to make it uniform.
[0032]
Among the above Examples, Examples 1 to 5 were evaluated for the effect of preventing aging and the effect of improving rough skin. At that time, in each of the examples, the hydroxylated xanthene / benzophenone dimer was replaced with benzophenones corresponding to the constituent components of the dimer, and the results were similarly evaluated.
[0033]
First, the effect of preventing skin aging was evaluated by evaluating the effect of suppressing the occurrence of wrinkles in hairless mice. In the above evaluation, five hairless mice were used as one group, and the examples and comparative examples were applied to the back once a day for each group, and irradiated with 1 J / cm 2 / week long wavelength ultraviolet (UVA) for 50 weeks. Then, the occurrence of wrinkles on the back skin of the hairless mouse was observed, and scored according to the criteria shown in Table 1. At this time, a group to which only purified water was applied was used as a control. The results are shown in Table 2 by calculating the average value of each group and showing the relationship with the number of UVA irradiation days.
[Table 1]
Figure 0003582936
[0034]
Next, the effect of improving skin roughness was determined by using 20 female panelists with remarkable skin roughness symptoms as a group, and using each of the examples and comparative examples twice a day in a blind for one month continuously for one month. The symptoms of the skin after one month were observed and compared with before the start of use. The skin roughness symptoms were scored according to the criteria shown in Table 3 and the average value of 20 persons was calculated.
[Table 3]
Figure 0003582936
[0035]
[Table 2]
Figure 0003582936
In Table 2, occurrence of deep wrinkles was observed in most of the hairless mice after 50 weeks in the control group, but in the group to which the examples of the present invention were applied, the occurrence of wrinkles was significantly suppressed in any of the groups. After 50 weeks, the occurrence of wrinkles was recognized. On the other hand, in the comparative example application group containing only benzophenones alone, although the tendency of suppressing the occurrence of wrinkles is observed in any case, the degree of the suppression is extremely small, and tocopherol acetate, which is a vitamin having an anti-aging effect, is suppressed. In Comparative Examples 2 to 5 containing the same, the occurrence of wrinkles was not sufficiently suppressed.
[0036]
[Table 4]
Figure 0003582936
Next, Table 4 shows that in all the groups using the examples of the present invention, favorable improvement of the skin roughening symptom was observed, and that the skin condition was recovered to almost satisfactory. On the other hand, the skin roughness was not significantly improved in the group using Comparative Example 1 and the skin condition was not sufficiently recovered even in the groups using Comparative Examples 2 to 5.
[0037]
The sunscreen cosmetics of Examples 8 to 10 were evaluated for the effect of preventing sunburn. The evaluation of the sunburn preventing effect was carried out by measuring the Sun Protection Factor (SPF) and the UVA protection index. Also in this case, in each of the examples, the hydroxylated xanthene / benzophenone dimer was replaced with the corresponding benzophenones, respectively, as Comparative Examples 8 to 10, and the evaluation was performed simultaneously.
[0038]
The SPF was determined using a xenon arc solar simulator as a light source, the minimum erythema amount (MED) of the uncoated portion of the sample was determined in advance using 20 adult males of skin types I to III as subjects, and then the expected SPF value of the sample was measured. Irradiation was performed in five steps at a common ratio of 1.3, the MED of the sample-coated part was determined, the SPF was calculated by dividing the value of the sample-coated part by the value of the sample-uncoated part, and expressed as the average value of each subject. .
[0039]
On the other hand, the UVA protection index was determined using a xenon arc solar simulator as a light source, and a minimum immediate blackening amount (MIPD) of a sample uncoated portion was determined in advance using 20 adult males of skin types III and IV as subjects. Irradiation is performed in five steps at a common ratio of 1.25 over the expected defense index value of the sample, the MIPD of the sample-coated portion is obtained, and the value of the sample-coated portion is divided by the value of the sample-uncoated portion to calculate the defense factor. And the average value of each subject.
[0040]
Furthermore, after applying each sample, the SPF value and the UVA protection index after exercising for 2 hours in an environment of a temperature of 30 ° C. and a humidity of 75% were obtained in the same manner as described above, and these results are also shown in Table 5. Indicated.
[0041]
[Table 5]
Figure 0003582936
As is clear from Table 5, the examples of the present invention all show significantly higher SPF values and UVA protection indexes than the respective comparative examples. Then, even after exercising for 2 hours in a high-temperature and high-humidity environment, all of the examples of the present invention maintained good SPF value and UVA protection index. On the other hand, in the comparative example, the SPF value and the UVA protection index after the exercise for 2 hours were decreased, and particularly, in the cream and emulsion liquid forms of Comparative Examples 8 and 9, a marked decrease was observed.
[0042]
Moreover, skin irritation was evaluated for Examples 8 to 10 and Comparative Examples 8 to 10. The skin irritation was evaluated by performing a 48-hour obstruction sticking test on the back skin of 30 adult men as panelists, and the results were determined according to the criteria shown in Table 6, and the average value of the skin irritation index of 30 persons was calculated. . The results are shown in Table 7.
[Table 6]
Figure 0003582936
[0043]
[Table 7]
Figure 0003582936
In Table 7, Examples of the present invention all showed a very low skin irritation index of 0.03 to 0.10, and no problematic contact skin irritation and skin sensitization were observed. On the other hand, in each of the comparative examples, slight skin irritation was observed.
[0044]
Subsequently, Example 11 and Example 12 were evaluated for their protective action against damage to hair caused by ultraviolet rays. At that time, Comparative Examples 11 and 12 were obtained by replacing the hydroxylated xanthene / benzophenone dimer with the corresponding benzophenone in each Example. The undamaged hair bundle was immersed in each sample solution for 5 minutes, lightly washed with water and dried, irradiated with 174 kJ, 290 to 390 nm ultraviolet rays for 4 hours using a sun tester, and then scanned with a Hitachi scanning electron microscope. The condition of the hair was observed. The hair condition was scored according to the criteria shown in Table 8. Evaluation was performed using three types of hair bundles for the case where each sample was immersed and the case where only water washing was performed and ultraviolet irradiation was performed. Table 9 shows the average value of the evaluation points for each hair bundle.
[Table 8]
Figure 0003582936
[0045]
[Table 9]
Figure 0003582936
As can be seen from Table 9, the UV curation showed significant cuticle detachment overall in the control hair tress, but a slight cuticle detachment was observed when treated according to the example of the present invention. And showed that the hair was effectively protected from damage by ultraviolet light. On the other hand, when the treatment was performed according to the comparative example, the protective effect against damage by ultraviolet rays was small and insufficient.
[0046]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to effectively protect the skin from damage caused by light and oxidative stress, to treat or prevent skin diseases and skin aging symptoms caused by these, and to further improve the stability and An external preparation for skin with excellent safety was obtained. In addition, a cosmetic having a good ultraviolet protection effect and capable of favorably preventing inflammation and blackening due to sunburn and damage to hair by ultraviolet rays could be obtained.

Claims (2)

ヒドロキシル化キサンテンの 1 位,4位,9位の炭素と、ベンゾフェ ノンの3位の炭素が結合したヒドロキシル化キサンテン・ベンゾフェノン二量体の1種又は2種以上を含有することを特徴とする、皮膚外用剤において、ヒドロキシル化キサンテンがキサンテン-2,7-ジオールであり、ベンゾフェノン類が、2-ヒドロキシ-4-メトキシベンゾフェノン,2-ヒドロキシ-4-メトキシベンゾフェノン-5-スルホン酸及びその塩,ジヒドロキシジメトキシベンゾフェノン,ジヒドロキシジメトキシベンゾフェノン-スルホン酸及びその塩,2,4-ジヒドロキシベンゾフェノン及びテトラヒドロキシベンゾフェノンより選択されることを特徴とする皮膚外用剤 1 position hydroxyl xanthenes, 4, and 9-position carbon, characterized in that it contains one or more benzophenone non three-position hydroxylation xanthene-benzophenone dimer carbon bonded to, In a skin external preparation, the hydroxylated xanthene is xanthene-2,7-diol, and the benzophenones are 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and a salt thereof, An external preparation for skin characterized by being selected from dimethoxybenzophenone, dihydroxydimethoxybenzophenone-sulfonic acid and salts thereof, 2,4-dihydroxybenzophenone and tetrahydroxybenzophenone. 皮膚外用剤が、老化防止用化粧料又は日焼け止め用化粧料であることを特徴とする、請求項1に記載の皮膚外用剤。The skin external preparation according to claim 1 , wherein the skin external preparation is an antiaging cosmetic or a sunscreen cosmetic.
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