JP6868363B2 - 皮膚外用剤 - Google Patents
皮膚外用剤 Download PDFInfo
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- JP6868363B2 JP6868363B2 JP2016191310A JP2016191310A JP6868363B2 JP 6868363 B2 JP6868363 B2 JP 6868363B2 JP 2016191310 A JP2016191310 A JP 2016191310A JP 2016191310 A JP2016191310 A JP 2016191310A JP 6868363 B2 JP6868363 B2 JP 6868363B2
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Landscapes
- Cosmetics (AREA)
Description
(A)メントール 2質量%以上10質量%以下
(B)エステル油を含む20℃で液体の油 2質量%以上17質量%以下、
(C)水 50質量%以上95質量%以下
を含有し、エタノールの含有量が12質量%以下であり、かつ
成分(A)の含有量と成分(B)の含有量との質量比((A)/(B))が0.2以上1.5以下であり、エタノールの含有量と成分(B)の含有量との質量比(エタノール/(B))が2.5以下であり、金属又は金属塩を構成成分とする粉体の含有量が0.2質量%以下である皮膚外用剤に関する。
本発明の皮膚外用剤は、成分(A)として、メントールを2質量%以上10質量%以下含有する。かかるメントールをこのような量で含有することによって、後述するその余の成分及びその含有量や質量比とも相まって、快適な冷感と爽やかな刺激を充分に発揮しながら、その持続性をも良好に高めることができる。
なかでも、成分(A)の溶解性又は分散性を確保する観点、及び感触や使用感の観点から、炭素数8〜20の脂肪酸と炭素数2〜24の1価アルコールとのエステル、及びグリセリン脂肪酸エステルから選ばれる1種又は2種以上が好ましく、炭素数8〜20の脂肪酸と炭素数2〜24の1価アルコールとのエステルから選ばれる1種又は2種以上がより好ましい。より具体的には、成分(A)の溶解性又は分散性の観点、及び感触や使用感の観点から、イソノナン酸イソノニル、イソステアリン酸イソステアリル、ミリスチン酸イソプロピル、パルミチン酸イソプロピル、オレイン酸デシル、及びトリ(カプリン酸/カプリン酸)グリセリルから選ばれる1種又は2種以上が好ましく、イソノナン酸イソノニル、ミリスチン酸イソプロピル、及びパルミチン酸イソプロピルから選ばれる1種又は2種以上がより好ましい。またトリグリセリン脂肪酸エステル等のエステル油を含む、ホホバ油、オリーブ油等の植物油を用いることもできる。
なかでも、上記エステル油との相溶性を確保する観点、及び成分(A)等の他の20℃で固体の油性成分の良好な溶解性又は分散性を確保する観点、及び軽い感触と使用感の観点から、メントール誘導体又はシリコーン油を含有することが好ましい。シリコーン油としては、成分(A)等の20℃で固体の油性成分の良好な溶解性又は分散性を確保する観点、並びに軽い感触と使用感の観点から、25℃における粘度が50mPa・s以下のものが好ましく、1〜30mPa・sのものがより好ましく、1〜20mPa・sのものがさらに好ましい。また、同様の観点から、20℃で液体のシリコーン油の25℃における粘度は、好ましくは1mPa・s以上であり、また、好ましくは50mPa・s以下、より好ましくは30mPa・s以下、さらに好ましくは20mPa・s以下である。より具体的には、25℃における粘度が20mPa・s以下のジメチルポリシロキサン、又はメチルシクロポリシロキサンを含有することがより好ましく、25℃における粘度が20mPa・s以下のジメチルポリシロキサンを含有することがさらに好ましい。
なお、成分(B)の粘度は、25℃において、B型粘度計(TOKI SANGYO VISCOMETER TVB−10M、東機産業社製)、ロータ1にて、60rpm、1分間の条件で測定することができる。
かかる金属又は金属塩を構成成分とする粉体としては、例えば、酸化チタン、酸化亜鉛、酸化マグネシウム、酸化ジルコニウム、炭酸カルシウム、炭酸マグネシウム、ケイ酸マグネシウム、ケイ酸アルミニウム、硫酸バリウム、黄酸化鉄、及び黒酸化鉄から選ばれる1種又は2種以上が挙げられる。また、かかる金属又は金属塩を構成する粉体には、上記成分を含む粉体、例えば、含水ケイ酸マグネシウムを含むタルク、ケイ酸アルミニウム塩を含むマイカ(雲母)等も含まれる。
なお、上記ポリエチレングリコールの平均分子量とは、GPC(ゲルパーミェーションクロマトグラフィ)により測定される質量平均分子量を意味する。
表1に示す処方にしたがって、各ジェル状の皮膚外用剤を調製した。得られた皮膚外用剤を用い、下記方法にしたがって各評価を行った。なお、比較例4は混合しても分離してしまい調整することができなかったため、評価はしていない。
結果を表1に示す。
得られた皮膚外用剤を5℃で1ヶ月間保存した後、剤の状態を目視により評価した。
A:結晶もなく、固化も確認されなかった
C:針状の結晶が確認され、固化が生じていた
得られた皮膚外用剤を5名のパネラーの両脚の太腿前側に塗布し、塗布時におけるべたつき感について、下記基準にしたがって評価し、その平均値を求めた。
5:べたつき感がなかった
4:あまりべたつき感がなかった
3:ややべたつき感があった
2:べたつき感があった
1:かなりべたつき感があった
得られた皮膚外用剤を5名のパネラーの両脚の太腿前側に塗布し、塗布時における肌感触について、下記基準にしたがって評価し、その平均値を求めた。
5:とても滑らかでしっとりした感触であり、刺激も感じなかった
4:滑らかな感触であり、ほとんど刺激も感じなかった
3:やや刺激を感じた
2:刺激を感じた
1:かなり刺激を感じた
表2に示す処方にしたがって、上記実施例と同等の効果をもたらす皮膚外用剤を得るべく、各ジェル状の皮膚外用剤を調製した。
Claims (3)
- 次の成分(A)、(B)及び(C):
(A)メントール 2質量%以上10質量%以下
(B)エステル油の含有量が50質量%以上100質量%以下である、20℃で液体の油 2質量%以上17質量%以下、
(C)水 50質量%以上95質量%以下
を含有し、
カルボキシビニルポリマー、アクリル酸・メタクリル酸アルキル共重合体、アクリレーツ/アクリル酸アルキルクロスポリマーから選ばれるポリマーを含有し、
エタノールの含有量が2質量%以上10質量%以下であり、かつ
成分(A)の含有量と成分(B)の含有量との質量比((A)/(B))が0.2以上1.5以下であり、エタノールの含有量と成分(B)の含有量との質量比(エタノール/(B))が0.6以上2.5以下であり、金属又は金属塩を構成成分とする粉体の含有量が0.2質量%以下であるか、或いは金属又は金属塩を構成成分とする粉体を含有しない皮膚外用剤。 - 成分(A)以外の20℃で固体の油の含有量が、成分(B)の含有量に対して質量比(成分(A)以外の20℃で固体の油/(B))で0〜0.2である請求項1に記載の皮膚外用剤。
- 成分(A)以外の20℃で固体の油の含有量が、0〜1質量%である請求項1又は2に記載の皮膚外用剤。
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