JP6817001B2 - 水中油型液体入浴剤 - Google Patents
水中油型液体入浴剤 Download PDFInfo
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- JP6817001B2 JP6817001B2 JP2016179092A JP2016179092A JP6817001B2 JP 6817001 B2 JP6817001 B2 JP 6817001B2 JP 2016179092 A JP2016179092 A JP 2016179092A JP 2016179092 A JP2016179092 A JP 2016179092A JP 6817001 B2 JP6817001 B2 JP 6817001B2
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Landscapes
- Cosmetics (AREA)
Description
(A)N−ステアロイル−N−メチルタウリン塩、及びN−ラウロイル−N−メチルタウリン塩から選ばれる1種又は2種のアニオン界面活性剤 0.3質量%以上2.5質量%以下、
(B)アルキル基の炭素数が12以上22以下であってエチレンオキシ基の平均付加モル数が5以上40以下であるポリオキシエチレンアルキルエーテル(b1)を含み、かつHLBが8未満のノニオン界面活性剤の含有量が45質量%以下であるノニオン界面活性剤、
(C)グリセリン 5質量%以上20質量%以下
を含有し、成分(b1)の含有量が0.2質量%以上2.5質量%以下であり、かつ25℃におけるpHが5以上7以下である水中油型液体入浴剤に関する。
本発明の水中油型液体入浴剤は、成分(A)として、N−ステアロイル−N−メチルタウリン塩、及びN−ラウロイル−N−メチルタウリン塩から選ばれる1種又は2種のアニオン界面活性剤を0.3質量%以上2.5質量%以下含有する。なかでも、低刺激性でありながら、pH5〜7なる弱酸性のpH領域下でも優れた乳化能を発揮し、後述する特定量の成分(b1)及び成分(C)とも相まって、本発明の水中油型液体入浴剤における乳化粒子径の微細化に大いに寄与して、優れた保存安定性を付与することができる観点から、成分(A)として、N−ステアロイル−N−メチルタウリン塩を用いるのが好ましい。
なお、成分(b1)のHLBは、その種類によって種々様々であるため、用いる成分(b1)のHLBに応じて、HLBが8未満のノニオン界面活性剤の含有量を調整すればよい。すなわち、成分(b1)のHLBが8未満であれば、成分(B)中における成分(b1)の含有量を45質量%以下に調整すればよい。
なお、HLBとは、油−水系で界面活性剤の両液体に対する相対的親和力の比を表す指標となる値であり、グリフィン(GRIFFIN)の定義による、25℃におけるHLB値を意味する。グリフィンによるHLB値は、J.Soc.Cosm.Chem.,1954,5:249−256において定義されている。
なお、水中油型乳化組成物の乳化粒子のメジアン径は、レーザー回折/散乱式粒度分布測定装置(HORIBA社 LA−950)により測定される値を意味する。
表1に示す処方の液体入浴剤を、下記の方法にしたがって製造した。
グリシン、コハク酸、グリセリン(C)、N−ステアロイル−N−メチルタウリンナトリウム(A)、パラオキシ安息香酸メチル、パラオキシ安息香酸エチル、セラミド類似物質、及び水(全水分量中の10質量%)を混合し、各成分を溶解させて混合物Xを得た。次いで、得られた混合物Xに成分(b1)を含む成分(B)のノニオン界面活性剤と、油性成分(D)を添加し、得られた混合物Yの温度を75℃とした。
混合物Yの温度が55℃になったところで香料を添加して30℃まで冷却し、入浴剤を得た。
表1に示す処方とし、実施例1と同様にして各入浴剤を得た。
得られた入浴剤を用い、レーザー回折/散乱式粒度分布測定装置(HORIBA社 LA−950)により、乳化粒子径を測定し、そのメジアン径を求めた。
結果を表1に示す。
得られた入浴剤100mLを、内径50mmのガラス瓶に充填し、50℃で1か月間静置保存した後、外観を目視により確認し、標準品(製造後5℃にて保存したもの)との違いについて、下記基準にしたがって評価した。
結果を表1に示す。
A:標準品と同じでクリーミング及び油分離が全くなし
B:標準品と比較しクリーミング又は油分離がごく僅かに認められる
C:標準品と比較しクリーミング又は油分離がかなり認められる
混合物Yの温度について、上記75℃以外にも65℃〜85℃の範囲のなかから適宜選択し、その温度を各々一定に保った以外、実施例1と同様にして、各処方にしたがった入浴剤を複数得た。得られた各複数の入浴剤について、乳化粒子径が0.3μm以下に調整できた際の温度、及び保存安定性を確認し、下記基準にしたがって評価した。
A:複数の入浴剤において、保存安定性が良好であり、なおかつ0.3μm以下の微細な乳化粒子径が得られた温度範囲の幅は15℃以上であった。
B:複数の入浴剤において、保存安定性が良好であり、なおかつ0.3μm以下の微細な乳化粒子径が得られた温度範囲の幅は10℃以上15℃未満であった。
C:複数の入浴剤において、保存安定性が良好であり、なおかつ0.3μm以下の微細な乳化粒子径が得られた温度範囲の幅は10℃未満の範囲であった。
Claims (6)
- 次の成分(A)、(B)、及び(C):
(A)N−ステアロイル−N−メチルタウリン塩、及びN−ラウロイル−N−メチルタウリン塩から選ばれる1種又は2種のアニオン界面活性剤 0.3質量%以上2.5質量%以下、
(B)アルキル基の炭素数が12以上22以下であってエチレンオキシ基の平均付加モル数が5以上40以下であるポリオキシエチレンアルキルエーテル(b1)を含み、かつ成分(B)中におけるHLBが8未満のノニオン界面活性剤の含有量が45質量%以下であるノニオン界面活性剤、
(C)グリセリン 5質量%以上20質量%以下
を含有し、成分(b1)の含有量が0.2質量%以上2.5質量%以下であり、かつ25℃におけるpHが5以上7以下である水中油型液体入浴剤。 - 成分(B)中において、HLBが12以上のノニオン界面活性剤の含有量が、5質量%以上40質量%以下である請求項1に記載の水中油型液体入浴剤。
- 成分(A)の含有量と成分(B)の含有量との質量比((A)/(B))が、1以上6以下である請求項1又は2に記載の水中油型液体入浴剤。
- 成分(B)の含有量が、2質量%以上9質量%以下である請求項1〜3のいずれか1項に記載の水中油型液体入浴剤。
- 成分(B)中における成分(b1)の含有量が、3質量%以上75質量%以下である請求項1〜4のいずれか1項に記載の水中油型液体入浴剤。
- 成分(A)、成分(C)及び水の一部を混合した後、成分(B)及び油性成分を添加し、次いで得られた混合物を撹拌しながら残余の水を滴下する工程を備える、請求項1〜5のいずれか1項に記載の水中油型液体入浴剤の製造方法。
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