JP6856857B2 - Underwater oil type lotion - Google Patents
Underwater oil type lotion Download PDFInfo
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- JP6856857B2 JP6856857B2 JP2019125951A JP2019125951A JP6856857B2 JP 6856857 B2 JP6856857 B2 JP 6856857B2 JP 2019125951 A JP2019125951 A JP 2019125951A JP 2019125951 A JP2019125951 A JP 2019125951A JP 6856857 B2 JP6856857 B2 JP 6856857B2
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- 239000006210 lotion Substances 0.000 title claims description 88
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 107
- 239000003921 oil Substances 0.000 claims description 68
- 235000019198 oils Nutrition 0.000 claims description 68
- 239000004094 surface-active agent Substances 0.000 claims description 64
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 56
- 239000000194 fatty acid Substances 0.000 claims description 56
- 229930195729 fatty acid Natural products 0.000 claims description 56
- -1 fatty acid ester Chemical class 0.000 claims description 46
- 150000004665 fatty acids Chemical class 0.000 claims description 14
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- 230000003020 moisturizing effect Effects 0.000 description 23
- 238000002156 mixing Methods 0.000 description 15
- 239000002562 thickening agent Substances 0.000 description 11
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 8
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 8
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- 230000001333 moisturizer Effects 0.000 description 7
- 238000006116 polymerization reaction Methods 0.000 description 7
- XDOFQFKRPWOURC-UHFFFAOYSA-N 16-methylheptadecanoic acid Chemical compound CC(C)CCCCCCCCCCCCCCC(O)=O XDOFQFKRPWOURC-UHFFFAOYSA-N 0.000 description 6
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- PRAKJMSDJKAYCZ-UHFFFAOYSA-N dodecahydrosqualene Natural products CC(C)CCCC(C)CCCC(C)CCCCC(C)CCCC(C)CCCC(C)C PRAKJMSDJKAYCZ-UHFFFAOYSA-N 0.000 description 6
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- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 5
- 239000005635 Caprylic acid (CAS 124-07-2) Substances 0.000 description 4
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- DGSZGZSCHSQXFV-UHFFFAOYSA-N 2,3-bis(2-ethylhexanoyloxy)propyl 2-ethylhexanoate Chemical compound CCCCC(CC)C(=O)OCC(OC(=O)C(CC)CCCC)COC(=O)C(CC)CCCC DGSZGZSCHSQXFV-UHFFFAOYSA-N 0.000 description 3
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- 239000004480 active ingredient Substances 0.000 description 3
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- ULWHHBHJGPPBCO-UHFFFAOYSA-N propane-1,1-diol Chemical compound CCC(O)O ULWHHBHJGPPBCO-UHFFFAOYSA-N 0.000 description 3
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- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 3
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- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 3
- KZRXPHCVIMWWDS-AWEZNQCLSA-N (4S)-4-amino-5-dodecanoyloxy-5-oxopentanoic acid Chemical compound CCCCCCCCCCCC(=O)OC(=O)[C@@H](N)CCC(O)=O KZRXPHCVIMWWDS-AWEZNQCLSA-N 0.000 description 2
- YYGNTYWPHWGJRM-UHFFFAOYSA-N (6E,10E,14E,18E)-2,6,10,15,19,23-hexamethyltetracosa-2,6,10,14,18,22-hexaene Chemical compound CC(C)=CCCC(C)=CCCC(C)=CCCC=C(C)CCC=C(C)CCC=C(C)C YYGNTYWPHWGJRM-UHFFFAOYSA-N 0.000 description 2
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- GLCFQKXOQDQJFZ-UHFFFAOYSA-N 2-ethylhexyl 12-hydroxyoctadecanoate Chemical compound CCCCCCC(O)CCCCCCCCCCC(=O)OCC(CC)CCCC GLCFQKXOQDQJFZ-UHFFFAOYSA-N 0.000 description 2
- QCDWFXQBSFUVSP-UHFFFAOYSA-N 2-phenoxyethanol Chemical compound OCCOC1=CC=CC=C1 QCDWFXQBSFUVSP-UHFFFAOYSA-N 0.000 description 2
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- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
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- URXZXNYJPAJJOQ-UHFFFAOYSA-N Erucic acid Natural products CCCCCCC=CCCCCCCCCCCCC(O)=O URXZXNYJPAJJOQ-UHFFFAOYSA-N 0.000 description 2
- 239000004166 Lanolin Substances 0.000 description 2
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- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
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- HDTRYLNUVZCQOY-LIZSDCNHSA-N alpha,alpha-trehalose Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 HDTRYLNUVZCQOY-LIZSDCNHSA-N 0.000 description 2
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- OGBUMNBNEWYMNJ-UHFFFAOYSA-N batilol Chemical compound CCCCCCCCCCCCCCCCCCOCC(O)CO OGBUMNBNEWYMNJ-UHFFFAOYSA-N 0.000 description 2
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Images
Landscapes
- Cosmetics (AREA)
Description
本発明は、水中油型化粧水に関する。詳しくは、化粧水に油分が添加された水中油型化粧水に関する。 The present invention relates to an oil-in-water type lotion. More specifically, the present invention relates to an underwater oil type toner in which oil is added to the toner.
従来から、肌状態の改善を目的とした種々の化粧料(例えば、化粧水、乳液、クリーム等)が提供されており、洗顔後のスキンケア等において使用されている。通常、これらの化粧料は、化粧水を塗布した後に乳液やクリームを塗布するという手順で使用される。これは、モイスチャー効果に優れる化粧水によって肌に水分を供給した後に、エモリエント効果に優れる乳液やクリームによって水分を保持するためである。 Conventionally, various cosmetics (for example, lotion, milky lotion, cream, etc.) for the purpose of improving skin condition have been provided, and are used in skin care after face washing and the like. Usually, these cosmetics are used in the procedure of applying a milky lotion or cream after applying a lotion. This is because after moisturizing the skin with a lotion having an excellent moisturizing effect, the water is retained by a milky lotion or cream having an excellent emollient effect.
かかる化粧料の一例として、水分と油分とが混合された水中油型化粧料が挙げられる。この水中油型化粧料は、エモリエント効果に優れている一方で、油性成分が水分中に均一に存在する状態を長期間維持することが難しいため、増粘剤(例えばカラギーナン、カルボキシビニルポリマー等)が添加された高粘度の化粧料(乳液やクリーム等)の形態で使用される。かかる水中油型化粧料の一例として、特許文献1に記載の化粧料(白濁液状化粧料)が挙げられる。かかる特許文献1に記載の化粧料は、下記の成分(a)〜(d)を含有し、成分(a)と成分(b)の重量比が(a):(b)=1:1〜5:1であることを特徴とする。
(a)HLBが7以下の親油性ノニオン界面活性剤 0.01〜2重量%
(b)HLBが10以上の親水性界面活性剤 0.01〜2重量%
(c)油分 0〜2重量%
(d)カラギーナン 0.01〜0.5重量%
An example of such a cosmetic is an oil-in-water type cosmetic in which water and oil are mixed. While this oil-in-water cosmetic has an excellent emollient effect, it is difficult to maintain a state in which oily components are uniformly present in water for a long period of time. Therefore, a thickener (for example, carrageenan, carboxyvinyl polymer, etc.) It is used in the form of high-viscosity cosmetics (milky lotion, cream, etc.) to which is added. As an example of such an oil-in-water type cosmetic, the cosmetic (white turbid liquid cosmetic) described in Patent Document 1 can be mentioned. The cosmetics described in Patent Document 1 contain the following components (a) to (d), and the weight ratio of the component (a) to the component (b) is (a) :( b) = 1: 1 to 1. It is characterized by being 5: 1.
(A) Lipophilic nonionic surfactant with HLB of 7 or less 0.01 to 2% by weight
(B) Hydrophilic surfactant with HLB of 10 or more 0.01 to 2% by weight
(C) Oil content 0 to 2% by weight
(D) Carrageenan 0.01-0.5% by weight
本発明者らは、洗顔後のスキンケアの簡便化や乾燥肌の改善などのために、モイスチャー効果に優れた化粧水にエモリエント効果を付与することを検討している。このような化粧水を提供するには、エモリエント効果を発揮できる適度な量の油分を添加することが求められる。しかし、上記の通り、水分と油分を含む水中油型化粧料は、含有成分の分離を抑えるために、乳液やクリーム等の高粘度の形態で提供されることが通常であり、モイスチャー効果や使用感の観点で低粘度が求められる化粧水の形態で提供することが困難である。具体的には、通常の化粧水に油分を添加すると、長くとも数日でクリーミングと呼ばれる含有成分の凝集体(図1参照)が水面に生じ、含有成分の不均一化による品質低下が生じるおそれがある。 The present inventors are studying to impart an emollient effect to a lotion having an excellent moisturizing effect in order to simplify skin care after face washing and improve dry skin. In order to provide such a lotion, it is required to add an appropriate amount of oil capable of exerting an emollient effect. However, as described above, oil-in-water cosmetics containing water and oil are usually provided in a highly viscous form such as a milky lotion or cream in order to suppress the separation of the contained components, and have a moisturizing effect or use. It is difficult to provide in the form of a lotion that requires low viscosity from the viewpoint of feeling. Specifically, when oil is added to ordinary lotion, agglomerates of contained components called creaming (see FIG. 1) are formed on the water surface within a few days at the longest, and there is a risk that quality may deteriorate due to non-uniformity of the contained components. There is.
本発明は、上述の課題を解決するためになされたものであり、優れた経時安定性を有し、かつ、モイスチャー効果とエモリエント効果とを高いレベルで両立できる化粧水を提供することを目的とする。 The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a lotion having excellent stability over time and capable of achieving both a moisturizing effect and an emollient effect at a high level. To do.
本発明者らは、上述の課題を解決するために種々の実験と検討を行った結果、HLB値(Hydrophilic-Lipophilic Balance)が異なる2種類のポリグリセリン脂肪酸エステル系界面活性剤を混合すると、驚くべきことに、500mPa・s以下という低粘度の化粧水であるにも関わらず、クリーミングを長期間防止できる優れた経時安定性を発揮する場合があることを発見した。そして、かかる発見に基づいて実験と検討を重ねた結果、このような優れた経時安定性が適切に発揮される条件を見出して本発明を完成するに至った。 As a result of various experiments and studies to solve the above-mentioned problems, the present inventors are surprised when two kinds of polyglycerin fatty acid ester-based surfactants having different HLB values (Hydrophilic-Lipophilic Balance) are mixed. It was discovered that, despite the fact that the lotion has a low viscosity of 500 mPa · s or less, it may exhibit excellent temporal stability that can prevent creaming for a long period of time. Then, as a result of repeated experiments and studies based on such findings, the present invention has been completed by finding the conditions under which such excellent temporal stability is appropriately exhibited.
ここに開示される水中油型化粧水は、上述の知見に基づいてなされたものであり、次の成分A〜成分Cを含有する。
成分A:HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下
成分B:HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下
成分C:油分 0.1質量%以上3質量%以下
さらに、ここに開示される水中油型化粧水は、成分Bの含有量(WB)に対する成分Aの含有量(WA)の割合(WA/WB)が1以下であり、成分Cの含有量(WC)に対する成分Aと成分Bとの総量(WA+WB)の割合((WA+WB)/WC)が0.7以上であり、かつ、25℃の環境下においてB型粘度計を用いて回転速度60rpmで測定される粘度が500mPa・s以下である。
The oil-in-water type lotion disclosed herein was made based on the above findings, and contains the following components A to C.
Component A: Polyglycerin fatty acid ester-based surfactant having an HLB value of 8 or more and less than 12 0.2% by mass or more and 2% by mass or less Component B: Polyglycerin fatty acid ester-based surfactant having an HLB value of 12 or more and 18 or less. 2% by mass or more and 2% by mass or less Component C: Oil content 0.1% by mass or more and 3% by mass or less Further, the hydrophilic oil-type cosmetic water disclosed herein contains component A with respect to the content of component B (WB). the amount ratio of (W a) (W a / W B) is 1 or less, the ratio ((W a of the total amount of the components a and B to the content of the component C (W C) (W a + W B) + W B) / W C) is not less than 0.7, and a viscosity measured at a rotation speed 60rpm by using B type viscometer under 25 ° C. for environmental or less 500 mPa · s.
まず、本明細書における「水中油型化粧水」とは、連続相が水性成分(すなわち、「最も含有量が多い成分が水分」)である化粧水に油分が添加されたもののうち、化粧水として適切なモイスチャー効果が発揮できる程度に粘度が低く、かつ、油分が水分中に懸濁(若しくは可溶化)している化粧水を指す。すなわち、ここに開示される水中油型化粧水とは、0.1質量%以上の油分(成分C)を含有し、かつ、粘度が500mPa・s以下である低粘度の化粧水である。かかる水中油型化粧水は、優れたモイスチャー効果を有する化粧水に高いエモリエント効果が付与されている。そして、ここに開示される水中油型化粧水には、HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤(成分A)と、HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤(成分B)とが添加されている。これらの成分Aおよび成分Bを含有する水中油型化粧水において、「各成分の含有量」と、「成分A、Bの混合比(WA/WB)」と、「成分Cに対する成分A、Bの総量の比率((WA+WB)/WC)」の各々が所定の条件を満たすことによって、低粘度の化粧水に油分が添加されているにも関わらず、長期間放置してもクリーミングが生じない優れた経時安定性を発揮できることが、本発明者らの実験によって確認されている。すなわち、ここに開示される水中油型化粧水によると、優れた経時安定性を発揮し、かつ、モイスチャー効果とエモリエント効果とを高いレベルで両立できる。 First, the term "oil-in-water type toner" as used herein refers to a toner in which oil is added to a toner whose continuous phase is an aqueous component (that is, "the component having the highest content is water"). Refers to a lotion whose viscosity is low enough to exert an appropriate moisturizing effect and whose oil content is suspended (or solubilized) in water. That is, the oil-in-water type lotion disclosed herein is a low-viscosity lotion containing 0.1% by mass or more of oil (component C) and having a viscosity of 500 mPa · s or less. In such an oil-in-water type lotion, a lotion having an excellent moisturizing effect is imparted with a high emollient effect. The oil-in-water type lotion disclosed herein includes a polyglycerin fatty acid ester-based surfactant (component A) having an HLB value of 8 or more and less than 12, and a polyglycerin fatty acid ester-based surfactant having an HLB value of 12 or more and 18 or less. A surfactant (component B) is added. Oil-in-water lotion containing these components A and B, the "content of each component", a "component A, mixing ratio of B (W A / W B)", component to "Component C A , by each of the ratio of the total amount of B ((W a + W B ) / W C) "that satisfies a predetermined condition, despite the oil to lotion low viscosity is added, left for a long period of time and However, it has been confirmed by the experiments of the present inventors that excellent stability over time can be exhibited without creaming. That is, according to the oil-in-water type lotion disclosed herein, it is possible to exhibit excellent stability over time and to achieve both a moisturizing effect and an emollient effect at a high level.
なお、本明細書における「HLB値(Hydrophilic-Lipophilic Balance」とは、水分と油分を含む液相において、両液体に対する界面活性剤の相対的な親和性を表す指標であり、グリフィン法に基づく下記の式(1)によって求められたものである。一般に、HLB値が低くなるにつれて親油性が高くなる傾向があり、HLB値が高くなるにつれて親水性が高くなる傾向がある。すなわち、ここに開示される成分Aは相対的に親油性が高い界面活性剤であり、成分Bは相対的に親水性が高い界面活性剤であると言える。
HLB値=20×界面活性剤の親水部の式量の総和/界面活性剤の分子量 (1)
The "HLB value (Hydrophilic-Lipophilic Balance") in the present specification is an index showing the relative affinity of the surfactant with respect to both liquids in the liquid phase containing water and oil, and is described below based on the Griffin method. In general, the lower the HLB value, the higher the lipophilicity, and the higher the HLB value, the higher the hydrophilicity. That is, disclosed here. It can be said that the component A to be produced is a surfactant having a relatively high lipophilicity, and the component B is a surfactant having a relatively high hydrophilicity.
HLB value = 20 x sum of formulas of hydrophilic part of surfactant / molecular weight of surfactant (1)
ここに開示される水中油型化粧水の好ましい一態様では、成分Cの含有量(WC)が0.6質量%超3質量%以下である。成分C(油分)の含有量をこの範囲内に調整することによって、水分中に油分が均一に懸濁した化粧水が得られる。かかる化粧水は、優れたエモリエント効果を発揮し、モイスチャー効果とエモリエント効果とを特に高いレベルで両立することができる。また、本態様のように水分中に油分が懸濁した場合であっても、クリーミングの発生を長期間防止できる優れた経時安定性を発揮することが、本発明者らの実験によって確認されている。 In one preferred embodiment of the oil-in-water lotion disclosed herein, the content of component C (W C) is not more than 0.6 mass percent 3% by weight. By adjusting the content of component C (oil) within this range, a lotion in which the oil is uniformly suspended in water can be obtained. Such a lotion exerts an excellent emollient effect, and can achieve both a moisturizing effect and an emollient effect at a particularly high level. Further, it has been confirmed by the experiments of the present inventors that even when the oil is suspended in water as in this embodiment, it exhibits excellent stability over time that can prevent the occurrence of creaming for a long period of time. There is.
ここに開示される水中油型化粧水の好ましい一態様では、成分Cの含有量(WC)が0.1質量%以上0.6質量%以下である、成分C(油分)の含有量をこの範囲内に調整することによって、油分が可溶化した化粧水が得られる。かかる化粧水は、クリーミングの発生を確実に防止できるため、特に優れた経時安定性を発揮できる。 In one preferred embodiment of the oil-in-water lotion disclosed herein, the content of component C (W C) is not more than 0.6 mass% to 0.1 mass%, the content of the component C (oil) By adjusting within this range, a lotion in which the oil content is solubilized can be obtained. Since such a lotion can surely prevent the occurrence of creaming, it can exhibit particularly excellent stability over time.
ここに開示される水中油型化粧水の好ましい一態様では、成分Aにおける脂肪酸がジステアリン酸またはジイソステアリン酸である。これらを構成脂肪酸として含むポリグリセリン脂肪酸エステル系界面活性剤を成分Aとして使用することにより、優れた経時安定性を適切に発揮させることができる。 In a preferred embodiment of the oil-in-water cosmetics disclosed herein, the fatty acid in component A is distearic acid or diisostearic acid. By using a polyglycerin fatty acid ester-based surfactant containing these as a constituent fatty acid as the component A, excellent stability over time can be appropriately exhibited.
ここに開示される水中油型化粧水の好ましい一態様では、成分Bにおける脂肪酸がモノミリスチン酸である。モノミリスチン酸を構成脂肪酸として含むポリグリセリン脂肪酸エステル系界面活性剤を成分Bとして使用することにより、優れた経時安定性を適切に発揮させることができる。 In a preferred embodiment of the oil-in-water cosmetics disclosed herein, the fatty acid in component B is monomyristic acid. By using a polyglycerin fatty acid ester-based surfactant containing monomyristic acid as a constituent fatty acid as component B, excellent stability over time can be appropriately exhibited.
ここに開示される水中油型化粧水の好ましい一態様では、成分Cが植物油を含む。植物に由来する天然油は、合成油と比べて肌への浸透性が高く、かつ、肌状態の改善に貢献し得る有効成分(ビタミン等)を含んでいるため好ましい。そして、かかる植物油の中でも、茶の種子から抽出した油(茶種子油)は、皮膚常在菌の細菌叢を改善する効果を有しているため特に好適に使用し得る。 In a preferred embodiment of the oil-in-water cosmetics disclosed herein, component C comprises a vegetable oil. Natural oils derived from plants are preferable because they have higher permeability to the skin than synthetic oils and contain active ingredients (vitamins and the like) that can contribute to the improvement of skin condition. Among such vegetable oils, the oil extracted from tea seeds (tea seed oil) can be particularly preferably used because it has an effect of improving the bacterial flora of indigenous skin flora.
ここに開示される水中油型化粧水の好ましい一態様では、水分含有量が80質量%以上である。これによって、特に優れたモイスチャー効果を発揮できる。なお、水分含有量が増加すると、さらに粘度が低下するため、クリーミングが発生しやすくなる傾向がある。しかし、ここに開示される技術によると、80質量%以上という多量の水分を含有する場合でも優れた経時安定性を発揮できる。 In a preferred embodiment of the oil-in-water type cosmetic water disclosed herein, the water content is 80% by mass or more. As a result, a particularly excellent moisture effect can be exhibited. As the water content increases, the viscosity further decreases, so that creaming tends to occur easily. However, according to the technique disclosed herein, excellent stability over time can be exhibited even when a large amount of water of 80% by mass or more is contained.
ここに開示される水中油型化粧水の好ましい一態様では、(WA+WB)/WCが4以下である。優れた経時安定性の確保という観点からは、(WA+WB)/WCの上限値は特に限定されないが、ベタつき等の使用感の低下を考慮すると、界面活性剤である成分A、Bの総量(WA+WB)を少なくした方が好ましい。また、エモリエント効果を適切に付与することを考慮すると、油分(成分C)の含有量(WC)を多くした方が好ましい。これらの点を考慮すると、(WA+WB)/WCの上限を4以下に設定することが好ましい。 In one preferred embodiment of the oil-in-water lotion disclosed herein, (W A + W B) / W C is 4 or less. From the viewpoint of ensuring excellent stability over time, (W A + W B) / W is C not particularly limited upper limit, considering the reduction in the feeling of use such as stickiness, component A is a surfactant, B of the total amount (W a + W B) it is preferable that the small. In consideration of appropriately imparting emollient, oil better to increase the content of (component C) (W C) is preferred. Considering these points, it is preferable to set to 4 or less the upper limit of (W A + W B) / W C.
以下、本発明の好適な一実施形態を説明する。なお、本明細書において特に言及している事項以外の事柄であって本発明の実施に必要な事柄は、当該分野における従来技術に基づく当業者の設計事項として把握され得る。本発明は、本明細書に開示されている内容と当該分野における技術知識とに基づいて実施することができる。 Hereinafter, a preferred embodiment of the present invention will be described. Matters other than those specifically mentioned in the present specification and necessary for carrying out the present invention can be grasped as design matters of those skilled in the art based on the prior art in the art. The present invention can be carried out based on the contents disclosed in the present specification and technical knowledge in the art.
なお、本明細書において数値範囲を「A〜B」と示す場合、「A以上B以下(従ってAを上回りBを下回る範囲を包含する)」を意味するものとする。また、本明細書における各成分の「含有量」は、水中油型化粧水を構成する各成分(水分を含む)の総量を100質量%としたときの質量比(質量%)である。 In addition, when the numerical value range is shown as "A to B" in this specification, it means "A or more and B or less (therefore, the range which exceeds A and is less than B)". Further, the "content" of each component in the present specification is a mass ratio (mass%) when the total amount of each component (including water) constituting the oil-in-water type lotion is 100% by mass.
本実施形態に係る水中油型化粧水は、HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤(成分A)、HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤(成分B)、および油分(成分C)を含有し、かつ、粘度が500mPa・s以下の水中油型化粧水である。そして、本発明者らは、上記構成の水中油型化粧水において、下記の(1)〜(3)の各々が所定の条件を満たすことによって、モイスチャー効果とエモリエント効果とを高いレベルで両立でき、かつ、優れた経時安定性を発揮できることを確認している。以下、本実施形態に係る水中油型化粧水に含まれる各成分と、当該各成分の混合条件について説明する。
(1)各成分の含有量(WA、WB、WC)
(2)成分A、Bの混合比(WA/WB)
(3)成分Cに対する成分A、Bの総量の比率((WA+WB)/WC)
The oil-in-water type cosmetic water according to the present embodiment is a polyglycerin fatty acid ester-based surfactant (component A) having an HLB value of 8 or more and less than 12, and a polyglycerin fatty acid ester-based surfactant having an HLB value of 12 or more and 18 or less (component A). It is an oil-in-water type cosmetic water containing component B) and an oil component (component C) and having a viscosity of 500 mPa · s or less. Then, the present inventors can achieve both the moisturizing effect and the emollient effect at a high level by satisfying the predetermined conditions for each of the following (1) to (3) in the oil-in-water type lotion having the above constitution. Moreover, it has been confirmed that excellent stability over time can be exhibited. Hereinafter, each component contained in the oil-in-water type lotion according to the present embodiment and the mixing conditions of each component will be described.
(1) content of each component (W A, W B, W C)
(2) Component A, the mixing ratio of B (W A / W B)
(3) component to component C A, the ratio of the total amount of B ((W A + W B ) / W C)
1.各成分の説明
(1)ポリグリセリン脂肪酸エステル系界面活性剤
上記成分A〜成分Cを説明する前に、本明細書における「ポリグリセリン脂肪酸エステル系界面活性剤」について説明する。この「ポリグリセリン脂肪酸エステル系界面活性剤」とは、ポリグリセリンの一部に脂肪酸がエステル結合した構造を有するノニオン界面活性剤を指す。かかるポリグリセリン脂肪酸エステル系界面活性剤は、炭素数が8〜22個の脂肪酸と、ポリグリセリンとがエステル結合することによって構成されており、構成脂肪酸の種類、ポリグリセリンの重合度、エステル化率などによって、HLB値が広い範囲(例えば1以上18以下)で変化し得る。かかるポリグリセリン脂肪酸エステル系界面活性剤の構成脂肪酸としては、ラウリン酸、ミリスチン酸、ステアリン酸、オレイン酸、エルカ酸、ベヘニン酸等が挙げられる。また、本実施形態におけるポリグリセリン脂肪酸エステル系界面活性剤では、ポリグリセリンとして、グリセリンの重合度が4〜10であるものが用いられ得る。なお、ここでの「ポリグリセリンの重合度」とは平均重合度である。すなわち、本明細書における「ポリグリセリン脂肪酸エステル−10」とは、グリセリンの重合度が10以外のポリグリセリン脂肪酸エステルも含み得る。
1. 1. Description of Each Component (1) Polyglycerin Fatty Acid Ester Surfactant Before explaining the above components A to C, the "polyglycerin fatty acid ester surfactant" in the present specification will be described. The "polyglycerin fatty acid ester-based surfactant" refers to a nonionic surfactant having a structure in which a fatty acid is ester-bonded to a part of polyglycerin. Such a polyglycerin fatty acid ester-based surfactant is composed of an ester bond between a fatty acid having 8 to 22 carbon atoms and polyglycerin, and is composed of the type of constituent fatty acid, the degree of polymerization of polyglycerin, and the esterification rate. The HLB value can change in a wide range (for example, 1 or more and 18 or less). Examples of the constituent fatty acids of the polyglycerin fatty acid ester-based surfactant include lauric acid, myristic acid, stearic acid, oleic acid, erucic acid, and behenic acid. Further, in the polyglycerin fatty acid ester-based surfactant in the present embodiment, a polyglycerin having a degree of polymerization of glycerin of 4 to 10 can be used. The "degree of polymerization of polyglycerin" here is the average degree of polymerization. That is, the “polyglycerin fatty acid ester-10” in the present specification may include a polyglycerin fatty acid ester having a degree of polymerization of glycerin other than 10.
(2)成分A
上記した通り、本実施形態に係る水中油型化粧水は、成分Aとして、HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤を含有する。この成分Aは、後述の成分Bと比べてHLB値が低く(親油基が多く)、相対的に高い親油性を有しているため、油分と混ざりやすい。上記の通り、成分Aとして使用されるポリグリセリン脂肪酸エステル系界面活性剤のHLB値は、8以上12未満である。かかる成分AのHLB値が8を下回ると成分Aの親水性が不足するおそれがあり、12以上になると成分Aの親油性が不足するおそれがある。これらの何れの場合も、経時安定性が大きく低下する原因になり得る。なお、成分Aの親水性を適切に確保するという観点から、成分AのHLB値の下限値は、8.5以上が好ましく、9以上がより好ましく、9.5以上がさらに好ましい。一方、成分Aの親油性を適切に確保するという観点から、成分AのHLB値の上限値は、11.5以下が好ましく、11以下がより好ましく、10.5以下がさらに好ましく、10以下が特に好ましい。
(2) Ingredient A
As described above, the oil-in-water type lotion according to the present embodiment contains a polyglycerin fatty acid ester-based surfactant having an HLB value of 8 or more and less than 12 as component A. This component A has a lower HLB value (many lipophilic groups) and has a relatively high lipophilicity as compared with the component B described later, and therefore is easily mixed with the oil content. As described above, the HLB value of the polyglycerin fatty acid ester-based surfactant used as the component A is 8 or more and less than 12. If the HLB value of the component A is less than 8, the hydrophilicity of the component A may be insufficient, and if it is 12 or more, the lipophilicity of the component A may be insufficient. In any of these cases, it can cause a significant decrease in stability over time. From the viewpoint of appropriately ensuring the hydrophilicity of the component A, the lower limit of the HLB value of the component A is preferably 8.5 or more, more preferably 9 or more, and further preferably 9.5 or more. On the other hand, from the viewpoint of appropriately ensuring the lipophilicity of the component A, the upper limit of the HLB value of the component A is preferably 11.5 or less, more preferably 11 or less, further preferably 10.5 or less, and 10 or less. Especially preferable.
上記成分Aとして使用されるポリグリセリン脂肪酸エステル系界面活性剤の構成脂肪酸は、HLB値が8以上12未満になれば特に限定されず、ラウリン酸、ミリスチン酸、ステアリン酸、オレイン酸、エルカ酸等から適宜選択できる。これらの中でも、油分を適切に懸濁させて優れた経時安定性を発揮するという観点からは、ジステアリン酸、ジイソステアリン酸等のステアリン酸やミリスチン酸等が好ましい。また、ポリグリセリンの重合度についても、HLB値が8以上12未満になれば特に限定されず、4〜10の範囲から適宜選択できる。このような成分Aの一例として、ジステアリン酸ポリグリセリル−10(HLB値=9.5)、ジイソステアリン酸ポリグリセリル−10(HLB値=10)、ミリスチン酸ポリグリセリル−6(HLB値=11)、ステアリン酸ポリグリセリル−6(HLB値=9)、イソステアリン酸ポリグリセリル−10(HLB値=10.5)等が好適に使用され得る。これらの中でも経時安定性を適切に発揮させるという観点から、ジステアリン酸ポリグリセリル−10やジイソステアリン酸ポリグリセリル−10が好ましい。なお、成分Aは、上述のHLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤を単独で含むものであってもよいし、2種以上を混合したものであってもよい。 The constituent fatty acids of the polyglycerin fatty acid ester-based surfactant used as the above component A are not particularly limited as long as the HLB value is 8 or more and less than 12, and lauric acid, myristic acid, stearic acid, oleic acid, erucic acid and the like are not particularly limited. Can be selected as appropriate. Among these, stearic acid such as distearic acid and diisostearic acid, myristic acid and the like are preferable from the viewpoint of appropriately suspending the oil component and exhibiting excellent stability over time. Further, the degree of polymerization of polyglycerin is not particularly limited as long as the HLB value is 8 or more and less than 12, and can be appropriately selected from the range of 4 to 10. As an example of such a component A, polyglyceryl distearate-10 (HLB value = 9.5), polyglyceryl diisostearate-10 (HLB value = 10), polyglyceryl myristate-6 (HLB value = 11), polyglyceryl stearate. −6 (HLB value = 9), polyglyceryl isostearate-10 (HLB value = 10.5) and the like can be preferably used. Among these, polyglyceryl distearate-10 and polyglyceryl diisostearate-10 are preferable from the viewpoint of appropriately exhibiting stability over time. The component A may contain the above-mentioned polyglycerin fatty acid ester-based surfactant having an HLB value of 8 or more and less than 12 alone, or may be a mixture of two or more.
(3)成分B
本実施形態に係る水中油型化粧水の成分Bは、HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤である。この成分Bは、上述した成分AよりもHLB値が高く(親水基が多く)、相対的に高い親水性を有しているため、水分に溶けやすい。上記の通り、成分Bとして使用されるポリグリセリン脂肪酸エステル系界面活性剤のHLB値は、12以上18以下である。HLB値が12未満になると成分Bの親水性が不足するおそれがあり、18を超えると親油性が不足するおそれがある。なお、成分Bの親水性を適切に確保するという観点から、成分BのHLB値の下限値は、12.5以上が好ましく、13以上がより好ましく、13.5以上がさらに好ましい。一方、成分Bの親油性を適切に確保するという観点から、成分BのHLB値の上限値は、17以下が好ましく、16以下がより好ましく、15以下がさらに好ましく、14.5以下が特に好ましい。
(3) Component B
The component B of the oil-in-water type cosmetic water according to the present embodiment is a polyglycerin fatty acid ester-based surfactant having an HLB value of 12 or more and 18 or less. Since this component B has a higher HLB value (many hydrophilic groups) and relatively high hydrophilicity than the above-mentioned component A, it is easily dissolved in water. As described above, the HLB value of the polyglycerin fatty acid ester-based surfactant used as the component B is 12 or more and 18 or less. If the HLB value is less than 12, the hydrophilicity of component B may be insufficient, and if it exceeds 18, the lipophilicity may be insufficient. From the viewpoint of appropriately ensuring the hydrophilicity of the component B, the lower limit of the HLB value of the component B is preferably 12.5 or more, more preferably 13 or more, still more preferably 13.5 or more. On the other hand, from the viewpoint of appropriately ensuring the lipophilicity of the component B, the upper limit of the HLB value of the component B is preferably 17 or less, more preferably 16 or less, further preferably 15 or less, and particularly preferably 14.5 or less. ..
また、成分Bとして使用されるポリグリセリン脂肪酸エステル系界面活性剤の構成脂肪酸は、HLB値が12以上18以下になれば特に限定されないが、ラウリン酸、ミリスチン酸、ステアリン酸、オレイン酸、パルミチン酸等から適宜選択できる。これらの中でも、優れた経時安定性を適切に発揮させるという観点からは、(モノ)ミリスチン酸等が好ましい。また、成分Bのポリグリセリンの重合度についても、12以上18以下という所望のHLB値を得ることができれば特に限定されず、4〜10の範囲から適宜選択できる。このような成分Bの一例として、ミリスチン酸ポリグリセリル−10(HLB値=14)、ステアリン酸ポリグリセリル−10(HLB値=12)、オレイン酸ポリグリセリル−10(HLB値=12)、ラウリン酸ポリグリセリル−6(HLB値=14.5)、ラウリン酸ポリグリセリル−10(HLB値=15.5)、パルミチン酸ポリグリセリル−10(HLB値=12.5)等が好適に使用され得る。これらの中でも経時安定性を適切に発揮するという観点から、ミリスチン酸ポリグリセリル−10が好ましい。なお、成分Aと同様に、成分Bは、所望のHLB値(12以上18以下)を有するポリグリセリン脂肪酸エステル系界面活性剤を単独で含むものであってもよいし、2種以上を混合したものであってもよい。 The constituent fatty acids of the polyglycerin fatty acid ester-based surfactant used as component B are not particularly limited as long as the HLB value is 12 or more and 18 or less, but lauric acid, myristic acid, stearic acid, oleic acid, and palmitic acid. Etc. can be selected as appropriate. Among these, (mono) myristic acid and the like are preferable from the viewpoint of appropriately exhibiting excellent stability over time. Further, the degree of polymerization of the polyglycerin of the component B is not particularly limited as long as a desired HLB value of 12 or more and 18 or less can be obtained, and can be appropriately selected from the range of 4 to 10. As an example of such a component B, polyglyceryl myristate-10 (HLB value = 14), polyglyceryl stearate-10 (HLB value = 12), polyglyceryl oleate-10 (HLB value = 12), polyglyceryl laurate-6. (HLB value = 14.5), polyglyceryl laurate-10 (HLB value = 15.5), polyglyceryl palmitate-10 (HLB value = 12.5) and the like can be preferably used. Among these, polyglyceryl-10 myristate is preferable from the viewpoint of appropriately exhibiting stability over time. As with the component A, the component B may contain a polyglycerin fatty acid ester-based surfactant having a desired HLB value (12 or more and 18 or less) alone, or a mixture of two or more thereof. It may be a thing.
(4)成分C
本実施形態に係る水中油型化粧水は、成分Cとして油分を含有する。かかる成分Cとして使用され得る油分は、エモリエント効果の付与を目的に化粧料に使用され得るもののうち、常温(25℃)で液状であるものを特に制限なく使用できる。かかる(C)油分としては、植物油、動物油、合成油などを使用できる。植物油としては、アボガド油、マカデミアナッツ油、オリーブ油、ベニバナ油、ナタネ油、ゴマ油、小麦胚芽油、アマニ油、綿実油、大豆油、パーム油、ヤシ油、ヒマシ油、ホホバ油、ヒマワリ油、ツバキ油、トウモロコシ油、茶種子油等が挙げられる。なお、オリーブ油やベニバナ油に含まれるスクワランを安定化させたスクワレン等の植物由来の加工油も使用できる。また、動物油としては、液状ラノリン等が挙げられる。合成油としては、ミリスチン酸イソプロピル、ミリスチン酸オクチルドデシル、イソステアリン酸イソプロピル、イソノナン酸イソノニル、ステアリン酸ブチル、オレイン酸オレイル、イソノナン酸イソトリデシル、ミリスチン酸イソステアリル、リシノレイン酸オクチルドデシル、ヒドロキシステアリン酸オクチル、モノイソステアリン酸ジグリセリル、パルミチン酸エチルヘキシル、エチルヘキサン酸セチル、メトキシケイ皮酸オクチル、酢酸トコフェロール、炭酸プロピレン、リンゴ酸ジイソステアリル、ジカプリル酸プロピレングリコール、ジカプリン酸ネオペンチルグリコール、ジエチルヘキサン酸ネオペンチルグリコール、ジイソステアリン酸ジグリセリル、ジイソステアリン酸プロパンジオール、モノイソステアリン酸モノミリスチン酸グリセリル、ジイソステアリン酸グリセリル、トリイソステアリン酸グリセリル、ジ(カプリン酸/カプリル酸)プロパンジオール、トリ(カプリル酸/カプリン酸)グリセリル、トリ2−エチルヘキサン酸グリセリル、トリエチルヘキサノイン、トリ−2−エチルヘキサン酸トリメチロールプロパン、トリイソステアリン酸トリメチロールプロパン、テトラオクタン酸ペンタエリスリチル、テトラエチルヘキサン酸ペンタエリスリット、テトライソステアリン酸ペンタエリスリトール、イソステアリン酸ポリグリセリル−2、ジイソステアリン酸ポリグリセリル−2、トリイソステアリン酸ポリグリセリル−2、テトライソステアリン酸ポリグリセリル−2、オクタカプリル酸ポリグリセリル−6、(イソステアリン酸/セバシン酸)ジトリメチロールプロパンオリゴエステル、ラウロイルグルタミン酸ジ(フィトステリル/オクチルドデシル)、ラウロイルグルタミン酸ジ(フィトステリル・ベヘニル・オクチルドデシル)、イソステアリン酸トレハロースエステルズ、ヒドロキシステアリン酸エチルヘキシル、フィトステロール脂肪酸エステル、コレステロール脂肪酸エステル、ポリグリセリン脂肪酸エステル、ペンタエリスリトール脂肪酸エステル等の脂肪酸エステルが挙げられる。また、成分Cとして、これらの油分を2種以上混合したものを使用してもよい。
(4) Component C
The oil-in-water type lotion according to this embodiment contains an oil component C. As the oil component that can be used as the component C, among those that can be used in cosmetics for the purpose of imparting an emollient effect, those that are liquid at room temperature (25 ° C.) can be used without particular limitation. As the oil component (C), vegetable oil, animal oil, synthetic oil and the like can be used. Vegetable oils include avocado oil, macadamia nut oil, olive oil, benibana oil, rapeseed oil, sesame oil, wheat germ oil, flaxseed oil, cottonseed oil, soybean oil, palm oil, palm oil, sunflower oil, jojoba oil, sunflower oil, camellia oil, Examples include corn oil and tea seed oil. In addition, plant-derived processed oils such as squalene in which squalene contained in olive oil and safflower oil are stabilized can also be used. Examples of animal oil include liquid lanolin and the like. Synthetic oils include isopropyl myristate, octyldodecyl myristate, isopropyl isostearate, isononyl isononanoate, butyl stearate, oleyl oleate, isotorideyl isononanoate, isostearyl myristate, octyldodecyl ricinoleate, octyl hydroxystearate, mono. Diglyceryl isostearate, ethylhexyl palmitate, cetyl ethylhexanate, octyl methoxycinnamate, tocopherol acetate, propylene carbonate, diisostearyl malate, propylene glycol dicaprylate, neopentyl glycol dicaprate, neopentyl glycol diethylhexanoate, Diglyceryl diisostearate, propanediol diisostearate, glyceryl monomyristate monoisostearate, glyceryl diisostearate, glyceryl triisostearate, di (caprylic acid / caprylic acid) propanediol, tri (caprylic acid / caprylic acid) glyceryl, tri 2 -Glyceryl ethylhexanoate, triethylhexanoin, trimethylhexanoin tri-2-ethylhexanoate, trimethylrolpropane triisostearate, pentaerythricyl tetraoctanoate, pentaerythlitre tetraethylhexanoate, pentaerythritol tetraisostearate, isostearic acid Polyglyceryl-2, polyglyceryl-2 diisostearate, polyglyceryl-2 triisostearate, polyglyceryl-2 tetraisostearate, polyglyceryl octacaprylate-6, ditrimethylolpropane oligoester (isostearic acid / sebacic acid), di (phytosteryl / phytosteryl / lauroyl glutamate) Octyldodecyl), di (phytosteryl behenyl octyldodecyl) lauroyl glutamate, trehalose isostearate, ethylhexyl hydroxystearate, phytosterol fatty acid ester, cholesterol fatty acid ester, polyglycerin fatty acid ester, pentaerythritol fatty acid ester and other fatty acid esters. Be done. Further, as the component C, a mixture of two or more of these oils may be used.
なお、上述した種々の油分の中でも、スクワランやトリエチルヘキサノインは、比較的容易に水分に懸濁されることが確認されているため、経時安定性に優れた水中油型化粧水を容易に得るという観点から好ましい。また、植物油は、合成油と比べて肌への浸透性が高く、ビタミン等の有効成分を含んでいるため、肌状態の改善という観点から好適に使用し得る。さらに、植物油の中でも、茶種子油は、善玉菌である表皮ブドウ球菌を減らさずに、悪玉菌である黄色ブドウ球菌を減少させるという選択的な抗菌性を有しているため、肌表面の細菌叢を改善する効果を発揮できることが本発明者らによって確認されている。このため、保湿や有効成分の付与等とは異なる細菌叢の改善という観点から肌状態を改善する場合には、油分として茶種子油を好適に使用できる。 Among the various oils mentioned above, squalane and triethylhexanoin have been confirmed to be relatively easily suspended in water, so that it is easy to obtain an oil-in-water type lotion having excellent stability over time. Preferred from the point of view. In addition, vegetable oil has higher permeability to the skin than synthetic oil and contains active ingredients such as vitamins, so that it can be suitably used from the viewpoint of improving the skin condition. Furthermore, among vegetable oils, tea seed oil has a selective antibacterial property of reducing Staphylococcus aureus, which is a bad bacterium, without reducing Staphylococcus epidermidis, which is a good bacterium. It has been confirmed by the present inventors that the effect of improving the flora can be exhibited. Therefore, when improving the skin condition from the viewpoint of improving the bacterial flora, which is different from moisturizing and adding the active ingredient, tea seed oil can be preferably used as the oil component.
(5)溶媒
本実施形態に係る水中油型化粧水は、上述した成分A〜成分Cを溶媒に添加することによって調製される。かかる溶媒としては、脱イオン水、純水、蒸留水等の水が用いられる。なお、ここに開示される水中油型化粧水は、溶媒として水のみを使用する態様に限定されず、水とアルコール類の混合溶媒を使用することもできる。アルコール類としては、エタノール、ブタノール等の一価低級アルコール;ラウリルアルコール、ステアリルアルコール、ベヘニルアルコール、バチルアルコール等の高級アルコール類;ソルビトール、マルチトール、マンニトール、エリトリトール等の糖アルコール類;ラノリンアルコール、コレステロール、フィトステロール等のその他のアルコール類等が挙げられる。但し、本実施形態に係る水中油型化粧水は、肌へのなじみを良好にし、好適なモイスチャー効果を発揮するという観点から水分含有量を調節することが好ましい。すなわち、水中油型化粧水全体で、水分含有量が70質量%以上(好ましくは75質量%以上、より好ましくは80質量%以上)になるように水の使用量を設定すると好ましい。なお、水分含有量が高くなると、粘度が大きく低下して経時安定性が低下する傾向があるが、本実施形態によると、このような水分含有量が高い化粧水であっても、好適な経時安定性を発揮できる。このため、本実施形態における水分含有量の上限は、上述した成分A〜成分Cが適切に含まれていれば特に限定されず、99.5質量%以下であってもよい。なお、後述する他の添加物を添加する際には、水分含有量を95質量%以下にすることが好ましく、90質量%以下にすることがより好ましい。
(5) Solvent The oil-in-water type lotion according to the present embodiment is prepared by adding the above-mentioned components A to C to a solvent. As such a solvent, water such as deionized water, pure water, distilled water and the like is used. The oil-in-water type lotion disclosed herein is not limited to the mode in which only water is used as the solvent, and a mixed solvent of water and alcohols can also be used. Examples of alcohols include monohydric lower alcohols such as ethanol and butanol; higher alcohols such as lauryl alcohol, stearyl alcohol, behenyl alcohol and batyl alcohol; sugar alcohols such as sorbitol, martitol, mannitol and erythritol; lanolin alcohol, cholesterol, Other alcohols such as phytosterol may be mentioned. However, it is preferable to adjust the water content of the oil-in-water type lotion according to the present embodiment from the viewpoint of improving the compatibility with the skin and exerting a suitable moisturizing effect. That is, it is preferable to set the amount of water used so that the total water content of the oil-in-water type lotion is 70% by mass or more (preferably 75% by mass or more, more preferably 80% by mass or more). When the water content is high, the viscosity tends to be greatly reduced and the stability over time tends to be lowered. However, according to the present embodiment, even a lotion having such a high water content is suitable for a long time. Can demonstrate stability. Therefore, the upper limit of the water content in the present embodiment is not particularly limited as long as the above-mentioned components A to C are appropriately contained, and may be 99.5% by mass or less. When other additives described later are added, the water content is preferably 95% by mass or less, and more preferably 90% by mass or less.
(6)他の添加物
本実施形態に係る水中油型化粧水には、上述した成分A〜成分C以外に、この種の化粧料で使用され得る公知の添加物を使用できる。かかるの一例として、増粘剤、防腐剤、保湿剤、消炎剤、美白剤、香料、植物由来のエキス等が挙げられる。
(6) Other Additives In the oil-in-water type lotion according to the present embodiment, known additives that can be used in this kind of cosmetics can be used in addition to the above-mentioned components A to C. Examples of such include thickeners, preservatives, moisturizers, anti-inflammatory agents, whitening agents, fragrances, plant-derived extracts and the like.
但し、これらの添加物は、本発明の効果が著しく妨げられない範囲内で添加されている方が好ましい。例えば、従来公知の化粧料には、経時安定性やエモリエント効果の向上のために増粘剤が添加されることがある。しかし、この増粘剤によって粘度が増加すると、モイスチャー効果が低下し、モイスチャー効果とエモリエント効果とを両立する化粧水を調製できなくなるおそれがある。一方、本実施形態では、増粘剤が添加しなくても、好適な経時安定性とエモリエント効果を発揮できるため、過剰な粘度上昇を防止するという観点から、増粘剤として機能し得る成分を実質的に含有しない方が好ましい。なお、増粘剤を添加する場合には、後述する所定の粘度を超えない範囲で含有量を調整することが好ましい。なお、増粘剤としては、カラギーナン、デヒドロキサンタンガム、キサンタンガム、スクレロチウムガム、タマリンドガム、グアーガム、ローストビーンガム、ジェランガム、クインスシード、アラビアガム、アルギン酸塩、ペクチン、寒天、デンプン、マンナン、セルロース、キトサン、スクシノグリカン、ヒアルロン酸塩、シロキクラゲ多糖体、カルボキシビニルポリマー等の水溶性の増粘剤などが挙げられる。 However, it is preferable that these additives are added within a range in which the effects of the present invention are not significantly impaired. For example, a thickener may be added to conventionally known cosmetics in order to improve stability over time and emollient effect. However, if the viscosity is increased by this thickener, the moisturizing effect is lowered, and there is a risk that a lotion having both a moisturizing effect and an emollient effect cannot be prepared. On the other hand, in the present embodiment, a component that can function as a thickener can be used from the viewpoint of preventing an excessive increase in viscosity because it can exhibit suitable stability over time and an emollient effect without adding a thickener. It is preferable that it is not substantially contained. When a thickener is added, it is preferable to adjust the content within a range not exceeding a predetermined viscosity described later. Examples of thickeners include carrageenan, dehydroxanthan gum, xanthan gum, sclerothium gum, tamarind gum, guar gum, roast bean gum, gellan gum, quince seed, arabic gum, alginate, pectin, agar, starch, mannan, and cellulose. Examples thereof include water-soluble thickeners such as chitosan, xanthan glycan, hyaluronate, white jellyfish polysaccharide, and carboxyvinyl polymer.
また、防腐剤としては、フェノキシエタノール、メチルパラベン、エチルパラベン、ブチルパラベン、プロピルパラベン、レゾルシン、サリチル酸、デヒドロ酢酸、ヘキサクロロフェン、塩化ベンザルコニウム、イソプロピルメチルフェノール、アルカンジオール等が挙げられる。これらの防腐剤を添加する場合には、当該防腐剤の含有量を0.01質量%以上にすることが好ましく、0.05質量%以上にすることがより好ましく、0.1質量%以上にすることがさらに好ましい。これによって、適切な防腐効果を発揮させることができる。一方、成分A〜成分Cや水分の含有量の大幅な削減による本発明の効果の減退を防ぐという観点から、防腐剤の含有量の上限値は、5質量%以下が好ましく、2質量%以下がより好ましく、1質量%以下がさらに好ましく、0.5質量%以下が特に好ましい。 Examples of the preservative include phenoxyethanol, methylparaben, ethylparaben, butylparaben, propylparaben, resorcin, salicylic acid, dehydroacetic acid, hexachlorophene, benzalkonium chloride, isopropylmethylphenol, alkanediol and the like. When these preservatives are added, the content of the preservative is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and 0.1% by mass or more. It is more preferable to do so. As a result, an appropriate antiseptic effect can be exerted. On the other hand, from the viewpoint of preventing the effect of the present invention from diminishing due to a significant reduction in the contents of components A to C and water, the upper limit of the content of the preservative is preferably 5% by mass or less, preferably 2% by mass or less. Is more preferable, 1% by mass or less is further preferable, and 0.5% by mass or less is particularly preferable.
保湿剤としては、プロパンジオール、グリセリン、ジグリセリン、ポリグリセリン−4、ポリグリセリン−6、ポリグリセリン−10、ブチレングリコール、ペンチレングリコール、ソルビトール、マンニトール、グルコース、スクロース、フルクトース、キシリトール、マルトース、マルチトース、トレハロース、イノシトール、グリコシルトレハロース、グリコーゲンなどが挙げられる。これらの保湿剤は、エモリエント効果の更なる向上に貢献できる一方で粘度増加の原因にもなり得るため、増粘剤と同様に所定の粘度を超えないように含有量を設定することが好ましい。例えば、保湿剤の含有量の上限値は、20質量%以下が好ましく、17質量%以下がより好ましく、15質量%以下がさらに好ましく、12質量%以下が特に好ましい。一方、モイスチャー効果を適切に向上させるという観点から、保湿剤の含有量の下限値は、1質量%以上が好ましく、5質量%以下がより好ましく、7質量%以下がさらに好ましく、10質量%以上が特に好ましい。 Moisturizers include propanediol, glycerin, diglycerin, polyglycerin-4, polyglycerin-6, polyglycerin-10, butylene glycol, pentylene glycol, sorbitol, mannitol, glucose, sucrose, fructose, xylitol, maltose, and multitose. , Trehalose, inositol, glycosyl trehalose, glycogen and the like. While these moisturizers can contribute to further improvement of the emollient effect, they can also cause an increase in viscosity. Therefore, it is preferable to set the content so as not to exceed a predetermined viscosity as in the case of thickeners. For example, the upper limit of the content of the moisturizer is preferably 20% by mass or less, more preferably 17% by mass or less, further preferably 15% by mass or less, and particularly preferably 12% by mass or less. On the other hand, from the viewpoint of appropriately improving the moisturizing effect, the lower limit of the content of the moisturizer is preferably 1% by mass or more, more preferably 5% by mass or less, further preferably 7% by mass or less, and 10% by mass or more. Is particularly preferable.
消炎剤としては、グリチルリチン酸誘導体、グリチルレチン酸誘導体、サリチル酸誘導体、ヒノキチオール、酸化亜鉛、アラントイン等が例示される。これらの消炎剤を添加する場合には、当該消炎剤の含有量を0.1質量%以上1質量%以下にすることが好ましい。この範囲内であれば、他の成分の含有量を大幅に減らすことなく、適切な消炎効果を発揮させることができる。 Examples of the anti-inflammatory agent include glycyrrhizic acid derivative, glycyrrhetinic acid derivative, salicylic acid derivative, hinokitiol, zinc oxide, allantoin and the like. When these anti-inflammatory agents are added, the content of the anti-inflammatory agent is preferably 0.1% by mass or more and 1% by mass or less. Within this range, an appropriate anti-inflammatory effect can be exhibited without significantly reducing the content of other components.
美白剤としては、アスコルビン酸、アスコルビン酸誘導体、プラセンターエキス、アルブチン、トラネキサム酸、コウジ酸、イオウ、油溶性甘草抽出物、ユキノシタ抽出物等が例示される。これらの美白剤を添加する場合には、当該美白剤の含有量を0.1質量%以上5質量%以下にすることが好ましい。この範囲内であれば、他の成分の含有量を大幅に減らすことなく、適切な美白効果を発揮させることができる。 Examples of the whitening agent include ascorbic acid, ascorbic acid derivatives, placenta extract, arbutin, tranexamic acid, kojic acid, sulfur, oil-soluble licorice extract, and Yukinoshita extract. When these whitening agents are added, the content of the whitening agent is preferably 0.1% by mass or more and 5% by mass or less. Within this range, an appropriate whitening effect can be exhibited without significantly reducing the content of other components.
また、目的とする機能に応じて植物由来の各種エキスを添加することもできる。エキスを抽出する基となる植物としては、オウバク、オウゴン、シコン、シャクヤク、センブリ、バーチ、セージ、ビワ、ニンジン、アロエ、ゼニアオイ、アイリス、ブドウ、ヨクイニン、ヘチマ、ユリ、サフラン、センキュウ、ショウキュウ、オトギリソウ、オノニス、ローズマリー、ニンニク、トウガラシ、チンピ、トウキ、海藻、茶葉等が挙げられる。 In addition, various plant-derived extracts can be added according to the desired function. Plants from which the extract is extracted include pearl oyster, angelica acutiloba, shikon, sakuyaku, senburi, birch, sage, loquat, carrot, aloe, mallow, iris, grape, yokuinin, loofah, lily, saffron, senkyu, shokyu Examples include loquat, ononis, rosemary, garlic, capsicum, chimpi, angelica acutiloba, seaweed, and tea leaves.
2.各成分の混合条件
上述したように、本実施形態に係る水中油型化粧水は、優れた経時安定性を発揮し、かつ、モイスチャー効果とエモリエント効果とを高いレベルで両立させるために、各成分を混合する条件が調整されている。以下、具体的に説明する。
2. Mixing conditions of each component As described above, the oil-in-water type lotion according to the present embodiment exhibits excellent stability over time, and in order to achieve both a moisturizing effect and an emollient effect at a high level, each component is used. The conditions for mixing are adjusted. Hereinafter, a specific description will be given.
(1)粘度
まず、本実施形態に係る水中油型化粧水は、粘度が500mPa・s以下となるように各成分の含有量が調整される。これは、モイスチャー効果を適切に発揮し、かつ、適切な使用感を生じさせる化粧水を得るには、粘度を500mPa・s以下にすることが求められるためである。なお、粘度を低下させるにつれてモイスチャー効果や使用感が向上する傾向があるため、当該粘度は、300mPa・s以下が好ましく、200mPa・s以下がより好ましく、100mPa・s以下がさらに好ましく、50mPa・s以下が特に好ましい。なお、粘度の下限値は、特に限定されず、1mPa・s以上であってもよいし、10mPa・s以上であってもよいし、20mPa・s以上であってもよい。なお、本明細書における「粘度」は、25℃の環境下においてB型粘度計を用いて回転速度60rpmで測定されたものである。上述した各成分の中では、油分(成分C)、増粘剤、保湿剤等が粘度に大きな影響を与え得るため、所望の粘度が得られるようにこれらの成分の含有量を調整することが好ましい。
(1) Viscosity First, in the oil-in-water type lotion according to the present embodiment, the content of each component is adjusted so that the viscosity is 500 mPa · s or less. This is because the viscosity must be 500 mPa · s or less in order to obtain a lotion that appropriately exerts the moisturizing effect and gives an appropriate feeling of use. Since the moisture effect and usability tend to improve as the viscosity decreases, the viscosity is preferably 300 mPa · s or less, more preferably 200 mPa · s or less, further preferably 100 mPa · s or less, and 50 mPa · s. The following are particularly preferred. The lower limit of the viscosity is not particularly limited, and may be 1 mPa · s or more, 10 mPa · s or more, or 20 mPa · s or more. The "viscosity" in the present specification is measured at a rotation speed of 60 rpm using a B-type viscometer in an environment of 25 ° C. Among the above-mentioned components, oil (component C), thickener, moisturizer and the like can have a great influence on the viscosity, and therefore the content of these components can be adjusted so as to obtain a desired viscosity. preferable.
(2)成分Aの含有量(WA)
次に、各成分の具体的な含有量について説明する。まず、成分A(HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤)の含有量(WA)は、0.2質量%以上に設定される。上記したように、成分Aは、相対的に高い親油性を有する界面活性剤であるため、その含有量(WA)が少なくなりすぎると、成分C(油分)と好適に混ざる界面活性剤が少なくなり、分散性や経時安定性が大きく低下する可能性がある。なお、分散性や経時安定性をより好適に発揮させるという観点から、当該WAの下限は、0.3質量%以上が好ましく、0.4質量%以上がより好ましく、0.5質量%以上が特に好ましい。一方、成分Aの含有量(WA)が一定以上を超えると、分散性や経時安定性を向上させる効果が飽和するだけでなく、ベタつきなどの使用感の悪化が生じるおそれがある。このため、成分Aの含有量(WA)の上限は、2質量%以下に設定される。なお、より好適な使用感を得るという観点から、成分Aの含有量(WA)の上限は、1.5質量%以下が好ましく、1.2質量%以下がより好ましく、1質量%以下がさらに好ましく、0.8質量%以下が特に好ましい。
(2) the content of component A (W A)
Next, the specific content of each component will be described. First, the content of component A (polyglycerol fatty acid ester surfactant having an HLB value of less than 8 or more 12) (W A) is set to more than 0.2 mass%. As described above, the component A, for a surfactant having a relatively high lipophilicity, when the content (W A) is too small, the surfactant mixed to the preferred and component C (oil) It may be reduced and the dispersibility and stability over time may be significantly reduced. Incidentally, from the viewpoint of more favorably exhibit the dispersibility and stability over time, the lower limit of the W A is preferably at least 0.3 wt%, more preferably at least 0.4 wt%, 0.5 wt% Is particularly preferable. On the other hand, when the content of the component A (W A) is more than more than a certain, not only the effect of improving the dispersibility and stability over time is saturated, there is a possibility that the deterioration of the feeling, such as stickiness occurs. Therefore, the upper limit of the content of the component A (W A) is set to 2 mass% or less. In view of obtaining a more preferable feel, the upper limit of the content of the component A (W A) is preferably 1.5 mass% or less, more preferably 1.2 mass% or less, is 1 wt% or less More preferably, 0.8% by mass or less is particularly preferable.
(3)成分Bの含有量(WB)
次に、成分B(HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤)の含有量(WB)の下限は、0.2質量%以上である。成分Bは、相対的に高い親水性を有する界面活性剤であるため、その含有量(WB)が少なくなりすぎると、水中に好適に溶け込む界面活性剤が少なくなり、分散性や経時安定性が大きく低下する可能性がある。なお、分散性や経時安定性をより好適に発揮させるという観点から、成分Bの含有量(WB)の下限は、0.3質量%以上が好ましく、0.4質量%以上がより好ましく、0.6質量%以上が特に好ましい。一方、WBが一定以上を超えた場合も、分散性や経時安定性を向上させる効果が飽和するだけでなく、使用感の悪化が生じ得る。このため、成分Bの含有量(WB)の上限は、2質量%以下に定められる。なお、より好適な使用感を得るという観点から、成分Bの含有量(WB)の上限は、1.5質量%以下が好ましく、1.2質量%以下がより好ましく、1質量%以下がさらに好ましく、0.8質量%以下が特に好ましい。
(3) the content of the component B (W B)
Next, the lower limit of the content of the component B (HLB value of 12 to 18 of the polyglycerol fatty acid ester surfactant) (W B) is more than 0.2 mass%. Component B are the surfactants having relatively high hydrophilicity, when the content of (W B) is too small, the surfactant decreases to blend suitably in water, dispersibility and stability over time May drop significantly. Incidentally, from the viewpoint of more favorably exhibit the dispersibility and stability over time, the lower limit of the content of the component B (W B) is preferably at least 0.3 wt%, more preferably at least 0.4 wt%, 0.6% by mass or more is particularly preferable. On the other hand, even if W B exceeds more than a certain, not only the effect of improving the dispersibility and stability over time is saturated, the deterioration of feeling may occur. Therefore, the upper limit of the content of the component B (W B) is defined to 2 mass% or less. In view of obtaining a more preferable feel, the upper limit of the content of the component B (W B) is preferably 1.5 mass% or less, more preferably 1.2 mass% or less, is 1 wt% or less More preferably, 0.8% by mass or less is particularly preferable.
(4)成分Cの含有量(WC)
成分C(油分)の含有量(WC)の下限は、0.1質量%以上である。この油分の含有量(WC)が少なくなりすぎると、適切なエモリエント効果を付与できなくなる。なお、適切なエモリエント効果を付与するという観点から、成分Cの含有量(WC)の下限は、0.3質量%以上が好ましく、0.4質量%以上がより好ましい。また、詳しくは後述するが、油分が均一に懸濁した化粧水を調製し、特に優れたエモリエント効果を発揮させるという観点から、成分Cの含有量(WC)の下限は、0.65質量%以上が好ましく、0.7質量%以上がより好ましく、0.8質量%以上がさらに好ましく、1質量%以上が特に好ましい。一方、油分の含有量(WC)が多くなりすぎると、当該油分を適切に懸濁させるために必要な成分A、Bが増加するため、水分の不足による使用感やモイスチャー効果の低下などが生じ得る。このため、成分Cの含有量(WC)の上限は3質量%以下に設定される。なお、より適切な使用感やモイスチャー効果を確保するという観点から、成分Cの含有量の上限は、2.7質量%以下が好ましく、2.5質量%以下がより好ましく、2.3質量%以下がさらに好ましく、2質量%以下が特に好ましい。
(4) The content of the component C (W C)
The lower limit of the content of the component C (oil) (W C) is more than 0.1 mass%. When the content of this oil (W C) is too small, can not be granted appropriate emollient. From the viewpoint of imparting suitable emollient, the lower limit of the content of the component C (W C) is preferably at least 0.3 wt%, more preferably at least 0.4 mass%. Further, although the details will be described later, from the viewpoint of the oil was uniformly suspended lotion was prepared, to exhibit especially excellent emollient effect, the lower limit of the content of the component C (W C), 0.65 Weight % Or more is preferable, 0.7% by mass or more is more preferable, 0.8% by mass or more is further preferable, and 1% by mass or more is particularly preferable. On the other hand, when the content of oil (W C) is too large, component A required to properly suspend the oil, since B increases, such as a decrease in feeling and moisturizing effect due to lack of moisture Can occur. Therefore, the upper limit of the content of the component C (W C) is set to 3 mass% or less. From the viewpoint of ensuring a more appropriate feeling of use and a moisturizing effect, the upper limit of the content of the component C is preferably 2.7% by mass or less, more preferably 2.5% by mass or less, and 2.3% by mass. The following is more preferable, and 2% by mass or less is particularly preferable.
また、ここに開示される化粧水においては、成分C(油分)の含有量が0.6質量%以下になると油分が可溶化し、0.6質量%を超えると水分中に油分が均一に懸濁することが本発明者らの実験によって確認されている。かかる点を考慮すると、要求される化粧水の性質を考慮して、油分の含有量を適宜調節することが好ましい。例えば、特に優れたエモリエント効果を付与し、モイスチャー効果とエモリエント効果とを特に高いレベルで両立させるという観点からは、油分の含有量を0.6質量%超にすることが好ましい。一方、クリーミングを確実に防止できる特に優れた経時安定性を発揮させるという観点からは、油分の含有量を0.6質量%以下にすることが好ましい。なお、油分の含有量を0.6質量%超にしてエマルジョン状態の化粧水を得た場合であっても、従来よりも大幅に長い期間クリーミングを防止できる優れた経時安定性を発揮できることが本発明者らの実験によって確認されている。 Further, in the lotion disclosed here, when the content of component C (oil) is 0.6% by mass or less, the oil is solubilized, and when it exceeds 0.6% by mass, the oil is uniformly contained in the water. It has been confirmed by our experiments that it is suspended. Considering this point, it is preferable to appropriately adjust the oil content in consideration of the required properties of the lotion. For example, from the viewpoint of imparting a particularly excellent emollient effect and achieving both the moisturizing effect and the emollient effect at a particularly high level, it is preferable that the oil content is more than 0.6% by mass. On the other hand, from the viewpoint of exhibiting particularly excellent stability over time that can reliably prevent creaming, the oil content is preferably 0.6% by mass or less. Even when an emulsion-state lotion is obtained with an oil content of more than 0.6% by mass, it is possible to exhibit excellent temporal stability that can prevent creaming for a significantly longer period than before. It has been confirmed by the experiments of the inventors.
(5)成分A、Bの混合比(WA/WB)
次に、本実施形態に係る水中油型化粧水は、成分Aの含有量(WA)と成分Bの含有量(WB)の各々が上述の範囲を満たした上で、当該WBに対するWAの割合(WA/WB)が1以下であることが求められる。換言すると、本実施形態に係る水中油型化粧水では、相対的に親水性が高い成分Bの含有量が、親油性が高い成分Aの含有量の同等以上となるように、成分A、Bの混合比が定められている。本発明を限定する意図はないが、このような混合比で成分A、Bを混合することによって高い経時安定性が発揮されるのは、次のような作用が生じているためと推測される。すなわち、成分A、Bを上記混合比で混合した界面活性剤が高い経時安定性を発揮できるのは、液相と液相との界面に成分A、Bの両方が隙間なく配向し、最適な立体障害によってエマルジョン粒子の合一を防ぐという作用が生じているためと推測される。また、(WA/WB)の下限値は、特に限定されず、0.1以上であってもよい。この場合でも、適切な経時安定性を十分発揮させることができる。なお、さらに好適な経時安定性を発揮させるという観点から、(WA/WB)の下限値は、0.2以上が好ましく、0.3以上がより好ましく、0.5以上がさらに好ましく、0.7以上が特に好ましい。
(5) Component A, the mixing ratio of B (W A / W B)
Then, oil-in-water lotion according to the present embodiment, on each of the content of the component A content of (W A) and the component B (W B) satisfies the range described above, with respect to the W B it is required that the ratio of W a (W a / W B ) is 1 or less. In other words, in the oil-in-water type lotion according to the present embodiment, the components A and B so that the content of the component B having a relatively high hydrophilicity is equal to or higher than the content of the component A having a high lipophilicity. The mixing ratio of Although there is no intention of limiting the present invention, it is presumed that the high stability over time is exhibited by mixing the components A and B at such a mixing ratio because the following actions occur. .. That is, it is optimal that the surfactant in which the components A and B are mixed at the above mixing ratio can exhibit high stability over time because both the components A and B are oriented without gaps at the interface between the liquid phase and the liquid phase. It is presumed that this is because the steric hindrance has the effect of preventing the coalescence of emulsion particles. The lower limit of (W A / W B) is not particularly limited, and may be 0.1 or more. Even in this case, appropriate stability over time can be sufficiently exhibited. Incidentally, from the viewpoint of exerting a further preferred stability over time, the lower limit of (W A / W B) is preferably 0.2 or more, more preferably 0.3 or more, further preferably 0.5 or more, 0.7 or more is particularly preferable.
(6)成分Cに対する成分A、Bの総量の比率((WA+WB)/WC)
さらに、本実施形態に係る水中油型化粧水では、成分Cに対する成分A、Bの総量の比率((WA+WB)/WC)が0.7以上であることが求められる。これは、油分の含有量(WC)が多すぎる場合(若しくは界面活性剤の総量(WA+WB)が少なすぎる場合)には、上述した成分A、Bの混合比(WA/WB)を適切な値に調整したとしても、懸濁しない油分が残るためである。なお、油分の全量を適切に懸濁するという観点から、(WA+WB)/WCの下限値は、0.8以上が好ましい。一方、好適な経時安定性を発揮させるという観点からは、(WA+WB)/WCの上限値は、特に限定されず、例えば20以下であってもよいし、15以下であってもよい。但し、油分に対して過剰に界面活性剤(成分A、B)を添加すると、経時安定性を向上させる効果が飽和するだけでなく、ベタつきなどの使用感の悪化等が生じ得る。この点を考慮すると、(WA+WB)/WCの上限値は、10以下が好ましく、4以下がより好ましく、2以下がさらに好ましく、1.5以下が特に好ましく、例えば1.1以下にすることができる。
(6) component to component C A, the ratio of the total amount of B ((W A + W B ) / W C)
Furthermore, the oil-in-water lotion according to the present embodiment, it is required that the ratio of the total amount of components A, B to component C ((W A + W B ) / W C) is 0.7 or more. This is the case where the content of oil (W C) is too large (the total amount of agent or surfactant (if W A + W B) is too small), the aforementioned components A, the mixing ratio of B (W A / W This is because even if B ) is adjusted to an appropriate value, unsuspended oil remains. Incidentally, from the viewpoint of appropriately suspended the total amount of oil, the lower limit of (W A + W B) / W C is preferably 0.8 or more. On the other hand, from the viewpoint of exhibiting suitable stability over time, (W A + W B) the upper limit value of / W C is not particularly limited, and may be for example 20 or less, even 15 or less Good. However, if the surfactants (components A and B) are added excessively to the oil content, not only the effect of improving the stability over time is saturated, but also the usability such as stickiness may be deteriorated. In view of this, the upper limit of (W A + W B) / W C is preferably 10 or less, more preferably 4 or less, more preferably 2 or less, particularly preferably 1.5 or less, for example 1.1 or less Can be.
以上のように、本実施形態に係る化粧水は、所定量の油分を含有する、粘度500mPa・s以下の低粘度の水中油型化粧水である。この水中油型化粧水は、優れたモイスチャー効果を有する化粧水に好適なエモリエント効果が付与されているため、モイスチャー効果とエモリエント効果とを高いレベルで両立できる。
そして、この水中油型化粧水は、成分A(HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤)と、成分B(HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤)という2種類の界面活性剤を含有し、「WA〜WC」、「WA/WB」、「(WA+WB)/WC」の各々が所定の条件を満たすように設定されている。このため、低粘度の化粧水に油分を添加しているにもかかわらず、クリーミングの発生を長期間防止できる好適な経時安定性を発揮する。
このように、本実施形態に係る水中油型化粧水によると、優れた経時安定性を有し、かつ、モイスチャー効果とエモリエント効果とを高いレベルで両立できる。
As described above, the lotion according to the present embodiment is a low-viscosity oil-in-water lotion containing a predetermined amount of oil and having a viscosity of 500 mPa · s or less. Since this oil-in-water type lotion has an emollient effect suitable for a lotion having an excellent moisturizing effect, both the moisturizing effect and the emollient effect can be compatible at a high level.
The oil-in-water type cosmetic water contains component A (polyglycerin fatty acid ester-based surfactant having an HLB value of 8 or more and less than 12) and component B (polyglycerin fatty acid ester-based surfactant having an HLB value of 12 or more and 18 or less). contain two surfactants as agents), "W a to W-C", "W a / W B", "(W a + W B) / W C " each have to satisfy a predetermined condition It is set. Therefore, despite the fact that oil is added to the low-viscosity lotion, it exhibits suitable stability over time that can prevent the occurrence of creaming for a long period of time.
As described above, the oil-in-water type lotion according to the present embodiment has excellent stability over time, and can achieve both a moisturizing effect and an emollient effect at a high level.
なお、本実施形態に係る水中油型化粧水を調製する手段は、特に限定されず、この種の化粧水で採用されている公知の手段を特に制限なく使用することができる。例えば、上述した各成分を混合した後に、ホモジナイザー等の攪拌装置を用いて撹拌を行うことによって、本実施形態に係る水中油型化粧水を調製することができる。なお、上記したように、ここに開示される技術によると、特殊な装置や長時間の撹拌を要さずに、油分を水分に好適に懸濁させることができるため、製造効率の向上や設備コストの低減等に貢献することもできる。 The means for preparing the oil-in-water type lotion according to the present embodiment is not particularly limited, and known means used in this type of lotion can be used without particular limitation. For example, the oil-in-water type lotion according to the present embodiment can be prepared by mixing the above-mentioned components and then stirring the mixture using a stirring device such as a homogenizer. As described above, according to the technique disclosed here, the oil can be suitably suspended in water without the need for special equipment or long-term stirring, so that the production efficiency can be improved and the equipment can be improved. It can also contribute to cost reduction.
以上、本実施形態に係る水中油型化粧水について説明した。しかし、上述の説明は、例示にすぎず、請求の範囲を限定するものではない。すなわち、請求の範囲に記載の技術には、上述の実施形態で示した水中油型化粧水を様々に変更したものが含まれ得る。 The oil-in-water type lotion according to the present embodiment has been described above. However, the above description is merely an example and does not limit the scope of claims. That is, the technique described in the claims may include various modifications of the oil-in-water type lotion shown in the above-described embodiment.
[試験例]
次に、本発明の水中油型化粧水に関する試験例を説明する。なお、以下の試験例は、本発明を限定することを意図したものではない。
[Test example]
Next, a test example of the oil-in-water type lotion of the present invention will be described. The following test examples are not intended to limit the present invention.
1.サンプルの準備
(1)サンプル1
HLB値が9.5のジステアリン酸ポリグリセリル−10(成分A)と、HLB値が14のミリスチン酸ポリグリセリル−10(成分B)と、植物油由来のスクワラン(成分C)とを水に混合させた水中油型化粧水(サンプル1)を調製した。さらに、本サンプルでは、他の添加剤として、保湿剤(グリセリン、プロパンジオール)と、防腐剤(フェノキシエタノール)を添加した。なお、本試験では、70℃の環境で5分間撹拌した後に30℃まで冷却することで各成分を混合した。
1. 1. Sample preparation (1) Sample 1
In water in which polyglyceryl-10 distearate (component A) having an HLB value of 9.5, polyglyceryl-10 myristate (component B) having an HLB value of 14, and squalane derived from vegetable oil (component C) are mixed in water. An oil-type lotion (Sample 1) was prepared. Furthermore, in this sample, a moisturizer (glycerin, propanediol) and a preservative (phenoxyethanol) were added as other additives. In this test, each component was mixed by stirring in an environment of 70 ° C. for 5 minutes and then cooling to 30 ° C.
そして、サンプル1では、界面活性剤の混合比(WA/WB)が1となり、界面活性剤の総量(WA+WB)が1.2wt%となり、かつ、油分に対する界面活性剤の総量の割合((WA+WB)/WC)が0.8となるように各成分の含有量を設定した。各成分の詳細な含有量は、後述の表1に示す。また、このサンプル1では、成分Aと成分Bとを混合した界面活性剤の平均HLB値が11.75となった。 Then, in the sample 1, the mixing ratio of the surfactant (W A / W B) becomes 1, the total amount of surfactant (W A + W B) is next to 1.2 wt%, and the surfactant to the oil amount It was set content of each component ratio of ((W a + W B) / W C) to become 0.8. The detailed content of each component is shown in Table 1 below. Further, in this sample 1, the average HLB value of the surfactant in which the component A and the component B were mixed was 11.75.
(2)サンプル2
成分C(油分)としてトリエチルヘキサノインを使用した点を除いて、サンプル1と同じ条件で水中油型化粧水を調製した。
(2) Sample 2
An oil-in-water lotion was prepared under the same conditions as in Sample 1, except that triethylhexanoin was used as component C (oil).
(3)サンプル3〜4、6、9〜11
成分A〜成分Cの各々の含有量を異ならせた点を除いて、サンプル1と同じ条件で水中油型化粧水を調製した。
(3) Samples 3-4, 6, 9-11
An oil-in-water lotion was prepared under the same conditions as in Sample 1, except that the contents of each of the components A to C were different.
(4)サンプル5
成分Aとして、HLB値が10のジイソステアリン酸ポリグリセリル−10を使用した点を除いて、サンプル1と同じ条件で水中油型化粧水を調製した。
(4) Sample 5
An oil-in-water lotion was prepared under the same conditions as in Sample 1, except that polyglyceryl-10 diisostearate having an HLB value of 10 was used as the component A.
(5)サンプル7
成分B(HLB値が12以上18以下の界面活性剤)の代わりに、HLB値が8未満の界面活性剤であるトリオレイン酸ポリグリセリル−10(HLB値=7)を使用した点を除き、サンプル1と同じ条件で水中油型化粧水を調製した。
(5) Sample 7
Sample except that polyglyceryl trioleate-10 (HLB value = 7), which is a surfactant having an HLB value of less than 8, was used instead of component B (a surfactant having an HLB value of 12 or more and 18 or less). An oil-in-water type lotion was prepared under the same conditions as in 1.
(6)サンプル8
成分Bに相当する界面活性剤を添加せず、成分Aに相当する2種類の界面活性剤を混合した点を除き、サンプル1と同じ条件で水中油型化粧水を調製した。なお、本サンプルで使用した成分Aは、HLB値が9.5のジステアリン酸ポリグリセリル−10と、HLB値が10のジイソステアリン酸ポリグリセリル−10である。
(6) Sample 8
An oil-in-water lotion was prepared under the same conditions as in Sample 1, except that the surfactant corresponding to the component B was not added and two types of surfactants corresponding to the component A were mixed. The components A used in this sample are polyglyceryl-10 diisostearate having an HLB value of 9.5 and polyglyceryl-10 diisostearate having an HLB value of 10.
2.粘度測定
調製後の各サンプルを25℃の環境に静置し、株式会社東京計器製のB型粘度計(型式:B8M)を用いて粘度(mPa・s)を測定した、なお、本試験では、2号ローターを使用し、回転数を60rpm、測定時間を2分に設定した。測定結果を表1に示す。
2. Viscosity measurement Each sample after preparation was allowed to stand in an environment of 25 ° C., and the viscosity (mPa · s) was measured using a B-type viscometer (model: B8M) manufactured by Tokyo Keiki Co., Ltd. In this test, Using the No. 2 rotor, the rotation speed was set to 60 rpm and the measurement time was set to 2 minutes. The measurement results are shown in Table 1.
3.経時安定性評価
各サンプルを50℃の環境で3日間静置し、水面にクリーミングが生じているか否かを目視で検査した。サンプル1とサンプル7の写真を図1に示すと共に、各サンプルの評価結果を表1に示す。なお、表1における「○」はクリーミングが全く確認されなかった場合を示し、「×」はクリーミングが確認された場合を示す。
3. 3. Evaluation of stability over time Each sample was allowed to stand in an environment of 50 ° C. for 3 days, and visually inspected whether or not creaming occurred on the water surface. The photographs of Sample 1 and Sample 7 are shown in FIG. 1, and the evaluation results of each sample are shown in Table 1. In Table 1, "◯" indicates a case where creaming was not confirmed at all, and "x" indicates a case where creaming was confirmed.
表1に示すように、サンプル1〜11の何れにおいても、粘度が500mPa・s以下に維持されており、化粧水として使用できる可能性があることが確認された。そして、経時安定性評価の結果、サンプル1〜6は、低粘度の化粧水に油分が添加されているにもかかわらず、3日間静置してもクリーミングが殆ど生じない優れた経時安定性を発揮していることが分かった。 As shown in Table 1, it was confirmed that the viscosity of each of Samples 1 to 11 was maintained at 500 mPa · s or less, and that it could be used as a lotion. As a result of the evaluation of the stability over time, Samples 1 to 6 have excellent stability over time with almost no creaming even when left to stand for 3 days, even though oil is added to the low-viscosity lotion. It turned out to be demonstrating.
また、サンプル1、2を比較した結果、成分A、Bを所定の条件で混合すると、油分の種類にかかわらず、好適な経時安定性が発揮されることが分かった。また、サンプル1、5、7、8を比較した結果、2種類の界面活性剤を混合するのみでは、好適な安定性を発揮することができず、HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤である成分Aと、HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤である成分Bとを混合する必要があることが分かった。さらに、サンプル1〜2、4、6とサンプル11とを比較した結果、このような優れた経時安定性を発揮させるためには、界面活性剤の平均HLB値を調節するのみでは不十分であり、成分A、Bの混合比(WA/WB)と、成分Cに対する成分A、Bの総量の割合((WA+WB)/WC)に着目して成分A〜成分Cの含有量を調節する必要があることが分かった。加えて、サンプル1〜5とサンプル6を比較すると、サンプル1〜5では、油分に水分が懸濁したエマルジョンが形成されている一方で、サンプル6では、溶液となっていた。かかる結果から、エモリエント効果の付与という観点からは、サンプル1〜5のように0.6質量%を超える油分を添加した方が好ましく、経時安定性の向上という観点からはサンプル6のように油分の添加量を0.6質量%以下にした方が好ましいことが分かった。 Further, as a result of comparing Samples 1 and 2, it was found that when the components A and B were mixed under predetermined conditions, suitable stability over time was exhibited regardless of the type of oil content. Further, as a result of comparing Samples 1, 5, 7, and 8, it is not possible to exhibit suitable stability only by mixing two types of surfactants, and a polyglycerin fatty acid having an HLB value of 8 or more and less than 12 is not exhibited. It was found that it was necessary to mix component A, which is an ester-based surfactant, and component B, which is a polyglycerin fatty acid ester-based surfactant having an HLB value of 12 or more and 18 or less. Furthermore, as a result of comparing Samples 1, 2, 4, and 6 with Sample 11, it is not sufficient to adjust the average HLB value of the surfactant in order to exhibit such excellent temporal stability. , containing the components a, the mixing ratio of B and (W a / W B), the ratio of the total amount of components a, B to component C ((W a + W B ) / W C) to be the component of interest A~ component C It turned out that the amount needed to be adjusted. In addition, when Samples 1 to 5 and Sample 6 were compared, in Samples 1 to 5, an emulsion in which water was suspended in oil was formed, while in Sample 6, it was a solution. From such a result, from the viewpoint of imparting the emollient effect, it is preferable to add an oil content of more than 0.6% by mass as in Samples 1 to 5, and from the viewpoint of improving the stability over time, the oil content is as in Sample 6. It was found that it is preferable to add 0.6% by mass or less of.
以上、本発明の具体例を詳細に説明したが、これらは例示にすぎず、請求の範囲を限定するものではない。請求の範囲に記載の技術には、以上に例示した具体例を様々に変形、変更したものが含まれる。
Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.
Claims (12)
成分A HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下;
成分B HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下;
成分C 油分 0.1質量%以上3質量%以下;
を含有し、
前記成分Bの含有量(WB)に対する前記成分Aの含有量(WA)の割合(WA/WB)が1以下であり、
前記成分Cの含有量(WC)に対する前記成分Aと前記成分Bとの総量(WA+WB)の割合((WA+WB)/WC)が0.7以上1.1以下であり、かつ、
25℃の環境下においてB型粘度計を用いて回転速度60rpmで測定される粘度が500mPa・s以下である、水中油型化粧水。 Next component A to component C:
Component A Polyglycerin fatty acid ester-based surfactant with an HLB value of 8 or more and less than 12 0.2% by mass or more and 2% by mass or less;
Component B Polyglycerin fatty acid ester-based surfactant with HLB value of 12 or more and 18 or less 0.2% by mass or more and 2% by mass or less;
Component C Oil content 0.1% by mass or more and 3% by mass or less;
Contains,
The content of the component B content of the component A to (W B) ratio of (W A) (W A / W B) is not less than 1,
The proportion of the total amount of the components A and the component B to the content of the component C (W C) (W A + W B) ((W A + W B) / W C) is 0.7 to 1.1 Yes and
An oil-in-water type lotion having a viscosity of 500 mPa · s or less measured at a rotation speed of 60 rpm using a B-type viscometer in an environment of 25 ° C.
成分A HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下;Component A Polyglycerin fatty acid ester-based surfactant with an HLB value of 8 or more and less than 12 0.2% by mass or more and 2% by mass or less;
成分B HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下;Component B Polyglycerin fatty acid ester-based surfactant with HLB value of 12 or more and 18 or less 0.2% by mass or more and 2% by mass or less;
成分C 油分 0.1質量%以上3質量%以下;Component C Oil content 0.1% by mass or more and 3% by mass or less;
を含有し、かつ、Containing and
HLB値が8未満の界面活性剤を含有せず、Contains no surfactant with an HLB value less than 8
前記成分Bの含有量(WContent of component B (W BB )に対する前記成分Aの含有量(W), The content of the component A (W) AA )の割合(W) Percentage (W) AA /W/ W BB )が1以下であり、) Is 1 or less
前記成分Cの含有量(WContent of the component C (W CC )に対する前記成分Aと前記成分Bとの総量(W) With respect to the total amount (W) of the component A and the component B. AA +W+ W BB )の割合((W) Percentage ((W) AA +W+ W BB )/W) / W CC )が0.7以上2以下であり、かつ、) Is 0.7 or more and 2 or less, and
25℃の環境下においてB型粘度計を用いて回転速度60rpmで測定される粘度が500mPa・s以下である、水中油型化粧水。An oil-in-water type lotion having a viscosity of 500 mPa · s or less measured at a rotation speed of 60 rpm using a B-type viscometer in an environment of 25 ° C.
成分A HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下;Component A Polyglycerin fatty acid ester-based surfactant with an HLB value of 8 or more and less than 12 0.2% by mass or more and 2% by mass or less;
成分B HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下;Component B Polyglycerin fatty acid ester-based surfactant with HLB value of 12 or more and 18 or less 0.2% by mass or more and 2% by mass or less;
成分C 油分 0.1質量%以上3質量%以下;Component C Oil content 0.1% by mass or more and 3% by mass or less;
を含有し、Contains,
前記成分Bの含有量(WContent of component B (W BB )に対する前記成分Aの含有量(W), The content of the component A (W) AA )の割合(W) Percentage (W) AA /W/ W BB )が1以下であり、) Is 1 or less
前記成分Cの含有量(WContent of the component C (W CC )に対する前記成分Aと前記成分Bとの総量(W) With respect to the total amount (W) of the component A and the component B. AA +W+ W BB )の割合((W) Percentage ((W) AA +W+ W BB )/W) / W CC )が0.7以上2以下であり、) Is 0.7 or more and 2 or less,
25℃の環境下においてB型粘度計を用いて回転速度60rpmで測定される粘度が500mPa・s以下であり、かつ、The viscosity measured at a rotation speed of 60 rpm using a B-type viscometer in an environment of 25 ° C. is 500 mPa · s or less, and
界面活性剤の平均HLB値が11.75以上である、水中油型化粧水。An oil-in-water type lotion having an average HLB value of 11.75 or more.
成分A HLB値が8以上12未満のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下;Component A Polyglycerin fatty acid ester-based surfactant with an HLB value of 8 or more and less than 12 0.2% by mass or more and 2% by mass or less;
成分B HLB値が12以上18以下のポリグリセリン脂肪酸エステル系界面活性剤 0.2質量%以上2質量%以下;Component B Polyglycerin fatty acid ester-based surfactant with HLB value of 12 or more and 18 or less 0.2% by mass or more and 2% by mass or less;
成分C 油分 0.1質量%以上3質量%以下;Component C Oil content 0.1% by mass or more and 3% by mass or less;
を含有し、Contains,
前記成分Bの含有量(WContent of component B (W BB )に対する前記成分Aの含有量(W), The content of the component A (W) AA )の割合(W) Percentage (W) AA /W/ W BB )が0.7以下であり、) Is 0.7 or less,
前記成分Cの含有量(WContent of the component C (W CC )に対する前記成分Aと前記成分Bとの総量(W) With respect to the total amount (W) of the component A and the component B. AA +W+ W BB )の割合((W) Percentage ((W) AA +W+ W BB )/W) / W CC )が0.7以上であり、かつ、) Is 0.7 or more, and
25℃の環境下においてB型粘度計を用いて回転速度60rpmで測定される粘度が500mPa・s以下である、水中油型化粧水。An oil-in-water type lotion having a viscosity of 500 mPa · s or less measured at a rotation speed of 60 rpm using a B-type viscometer in an environment of 25 ° C.
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