JP2022086863A - Oil-in-water emulsion cosmetic - Google Patents

Abstract

To provide an oil-in-water emulsion cosmetic that contains stearyl glycyrrhetinate and has high stability over time and a good feeling of use.SOLUTION: An oil-in-water emulsion cosmetic contains PEG-240/HDI copolymer bis-decyltetradeceth-20 ether, trimethylglycine, stearyl glycyrrhetinate, a water-holding oil, a thickening polysaccharide, an acrylic polymer, and water. The oil-in-water emulsion cosmetic contains or does not contain a surfactant. In the case where a surfactant is contained, its content is more than 0 mass% and 0.5 mass% or less relative to the total mass of the oil-in-water emulsion cosmetic.SELECTED DRAWING: None

Description

The present disclosure relates to oil-in-water emulsified cosmetics.

Stearyl glycyrrhetinate is known to have an anti-inflammatory effect. In recent years, in anticipation of the anti-inflammatory effect of stearyl glycyrrhetinate, stearyl glycyrrhetinate has been added to cosmetics.
For example, Patent Document 1 discloses a composition for external use on the skin, such as a cream containing D-pantothenyl alcohol and stearyl glycyrrhetinate.

Japanese Unexamined Patent Publication No. 2019-19077

Since stearyl glycyrrhetinate is a component that is difficult to dissolve in an aqueous medium by itself, in order to add stearyl glycyrrhetinate to an aqueous cosmetic such as a lotion, the stearyl glycyrrhetinate is solubilized with a surfactant or solubilized. By using a large amount of oil and emulsifier (for example, surfactant and phospholipid), it is necessary to prepare an oil-in-water emulsified cosmetic in which stearyl glycyrrhetinate is contained in emulsified particles and dispersed in an aqueous medium. Become. For example, the external composition for skin described in Patent Document 1 uses a relatively large amount of an ionic surfactant. However, since the surfactant itself is sticky, a cosmetic containing a large amount of the surfactant tends to feel a strong stickiness after being applied to the skin, and it cannot be said that the feeling of use is good. For water-based cosmetics containing stearyl glycyrrhetinate, it is required that a moisturizing feeling unique to water-based cosmetics can be obtained in addition to suppressing the sticky feeling after application to the skin.

In an attempt to add stearyl glycyrrhetinate into an aqueous cosmetic product, the present inventors included stearyl glycyrrhetinate in emulsified particles and dispersed it in an aqueous medium without using a large amount of surfactant. We examined the use of oil-type cosmetics (so-called oil-in-water emulsified cosmetics). However, it has been found that when the amount of the surfactant is reduced, it becomes difficult to maintain the emulsified state stably, and the stability over time of the oil-in-water emulsified cosmetic is likely to be impaired.

An object to be solved by one embodiment of the present disclosure is to provide an oil-in-water emulsified cosmetic containing stearyl glycyrrhetinate, which is excellent in stability over time and has a good usability.

Specific means for solving the above problems include the following embodiments.
[1] With the (PEG-240 / decyltetradeceth-20 / HDI) copolymer,
With trimethylglycine,
With stearyl glycyrrhetinate,
Water-holding oil and
With thickening polysaccharides,
Acrylic polymer and
water and,
Including and
Oil-in-water emulsification that does not contain a surfactant or has a surfactant content in the range of more than 0% by mass and 0.5% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic. Cosmetics.
[2] The water-holding oil is di-lauroyl glutamate (phytosteryl / octyldodecyl), di-lauroyl glutamate (cholesteryl / octyldodecyl), dimerjilinoleic acid di (isostearyl / phytosteryl), dimergilinoleic acid di (phytosteryl / isostearyl). The oil-in-water emulsified cosmetic according to [1], which is at least one selected from the group consisting of / cetyl / stearyl / behenyl), dipentaerythrityl tripolyhydroxystearate, and tetra (hydroxystearic acid / isostearic acid) dipentaerythrityl.
[3] The oil-in-water emulsification according to [1] or [2], wherein the thickening polysaccharide is at least one selected from the group consisting of gellan gum, carrageenan, alkasilan, xanthan gum, pullulan, and locust bean gum. Cosmetics.
[4] The acrylic polymer is at least one selected from the group consisting of (Acrylate / alkyl acrylate (C10-30)) copolymers, carboxyvinyl polymers, and (acryloyldimethyltaurine ammonium / VP) copolymers, [1. ] To [3]. The oil-in-water emulsified cosmetic according to any one of [3].
[5] The oil-in-water emulsified cosmetic according to any one of [1] to [4], further comprising an ester oil.
[6] The ester oil is at least one selected from the group consisting of triethylhexanoine, tri (caprylic acid / capric acid) glyceryl, isopropyl palmitate, isotridecyl isononanoate, cetyl ethylhexanoate, and octyldodecyl myristate. , [5] The oil-in-water emulsified cosmetic according to [5].
[7] The oil-in-water emulsified cosmetic according to any one of [1] to [6], further comprising a hydrocarbon oil.
[8] The hydrocarbon oil is at least one selected from the group consisting of petrolatum, microcrystalline wax, hydrogenated polyisobutene, selecin, beeswax, candelilla wax, shea butter, jojoba seed oil, and hydroxystearic acid. 7] The oil-in-water emulsified cosmetic according to.
[9] The oil-in-water emulsified cosmetic according to [7] or [8], wherein the hydrocarbon oil is petrolatum.
[10] The oil-in-water emulsified cosmetic according to any one of [1] to [9], wherein the thickening polysaccharide is gellan gum.

According to one embodiment of the present disclosure, there is provided an oil-in-water emulsified cosmetic containing stearyl glycyrrhetinate, which is excellent in stability over time and has a good usability.

Hereinafter, the oil-in-water emulsified cosmetics disclosed in the present disclosure will be described in detail. The description of the requirements set forth below may be based on the exemplary embodiments of the present disclosure, but the present disclosure is not limited to such embodiments and is within the scope of the purposes of the present disclosure. Can be implemented with appropriate changes.

The numerical range indicated by using "-" in the present disclosure means a range including the numerical values before and after "-" as the lower limit value and the upper limit value, respectively.
In the numerical range described stepwise in the present disclosure, the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in another stepwise description. Further, in the numerical range described in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the value shown in the examples.

In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment.
In the present disclosure, the amount of each component in the oil-in-water emulsified cosmetic is the amount of the substance corresponding to each component in the oil-in-water emulsified cosmetic unless otherwise specified. It means the total amount of multiple substances present in the charge.

In the present disclosure, the term "aqueous phase" is used as a term corresponding to "oil phase" regardless of the type of solvent.

In the present disclosure, the term "feeling of use" means a feeling of stickiness and moisturizing, and the term "oil-in-water emulsified cosmetic having a good feeling of use" means that the feeling of stickiness after application to the skin is suppressed and the skin feels smooth. It means an oil-in-water emulsified cosmetic that gives a moisturizing feeling after being applied to.
In the present disclosure, "moisturizing feeling" means a moist feeling remaining on the surface of the skin.

[Oil-in-water emulsified cosmetics]
The oil-in-water emulsified cosmetics of the present disclosure include (PEG-240 / decyltetradeceth-20 / HDI) copolymers, trimethylglycine, stearyl glycyrrhetinate, water-holding oils, thickening polysaccharides, and acrylics. Contains polymer and water and does not contain surfactant, or the content of surfactant exceeds 0% by mass and 0.5% by mass with respect to the total mass of oil-in-water emulsified cosmetics. It is in the range of% or less.

Unlike conventional aqueous cosmetics containing stearyl glycyrrhetinate, the oil-in-water emulsified cosmetics of the present disclosure contain stearyl glycyrrhetinate in emulsified particles and disperse them in an aqueous medium without using a large amount of surfactant. , The emulsified type is an oil-in-water type cosmetic (so-called oil-in-water emulsified cosmetic), and stearyl glycyrrhetinate is blended in the aqueous cosmetic.
In general, when the amount of the surfactant is reduced, it becomes difficult to stably maintain the emulsified state, and the stability over time of the oil-in-water emulsified cosmetic is liable to be impaired. On the other hand, the oil-in-water emulsified cosmetic of the present disclosure contains (PEG-240 / decyltetradeceth-20 / HDI) copolymer, thickening polysaccharide, and acrylic polymer, so that the amount of the surfactant is contained. Is excellent in stability over time even when the amount of water is reduced.
In addition, since the surfactant itself is sticky, when a cosmetic containing a large amount of the surfactant is applied to the skin, it tends to feel strong stickiness. On the other hand, the oil-in-water emulsified cosmetic of the present disclosure does not contain a surfactant, or even if it contains a surfactant, the amount is small, so that the sticky feeling caused by the surfactant is suppressed. Further, the oil-in-water emulsified cosmetic of the present disclosure contains trimethylglycine, so that the sticky feeling after application to the skin is suppressed. In addition, the oil-in-water emulsified cosmetics of the present disclosure can obtain a good moisturizing feeling after being applied to the skin by containing a water-holding oil agent, and can be combined with a (PEG-240 / decyltetradeceth-20 / HDI) copolymer. By including it in combination, the moisturizing feeling can be further improved.
From the above, the oil-in-water emulsified cosmetic of the present disclosure has a good usability.

Hereinafter, each component of the oil-in-water emulsified cosmetic of the present disclosure will be described in detail.

[(PEG-240 / decyltetradeceth-20 / HDI) copolymer]
The oil-in-water emulsified cosmetics of the present disclosure include a (PEG-240 / decyltetradeceth-20 / HDI) copolymer.
In the oil-in-water emulsified cosmetics of the present disclosure, the (PEG-240 / decyltetradeceth-20 / HDI) copolymer may contribute to the improvement of the stability of the oil-in-water emulsified cosmetics over time.
Further, in the oil-in-water emulsified cosmetics of the present disclosure, the (PEG-240 / decyltetradeceth-20 / HDI) copolymer can contribute to the improvement of the moisturizing feeling.

"PEG" is an abbreviation for polyethylene glycol, and "HDI" is an abbreviation for hexamethylene diisocyanate.

The name "(PEG-240 / decyltetradeceth-20 / HDI) copolymer" is a cosmetic ingredient labeling name. The (PEG-240 / decyltetradeceth-20 / HDI) copolymer is called PEG-240 / HDI COPOLYMER BIS-DECYLTETRADECETH-20 ETHER in the INCI (International Nomenclature for Cosmetic Ingredients) name. Further, the (PEG-240 / decyltetradeceth-20 / HDI) copolymer is referred to as a polyethylene glycol / decyltetradeceth-20 / hexamethylene diisocyanate copolymer in the component labeling name of a quasi-drug.

The (PEG-240 / decyltetradeceth-20 / HDI) copolymer is commercially available from ADEKA Corporation under the trade name "Adecanol (registered trademark) GT-700".

The content of the (PEG-240 / decyltetradeceth-20 / HDI) copolymer in the oil-in-water emulsified cosmetics of the present disclosure is not particularly limited, but for example, with respect to the total mass of the oil-in-water emulsified cosmetics. It is preferably 0.5% by mass to 3% by mass.
The content of the (PEG-240 / decyltetradeceth-20 / HDI) copolymer in the oil-in-water emulsified cosmetic of the present disclosure is 0.5% by mass or more based on the total mass of the oil-in-water emulsified cosmetic. And, the stability over time of the oil-in-water emulsified cosmetic tends to be further improved. Further, the content of the (PEG-240 / decyltetradeceth-20 / HDI) copolymer in the oil-in-water emulsified cosmetic of the present disclosure is 0.5% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic. If so, a better moisturizing sensation tends to be obtained after application to the skin.
From this point of view, the content of the (PEG-240 / decyltetradeceth-20 / HDI) copolymer in the oil-in-water emulsified cosmetic of the present disclosure is 0 with respect to the total mass of the oil-in-water emulsified cosmetic. It is preferably 5.5% by mass or more, more preferably 0.8% by mass or more, and further preferably 1% by mass or more.
Further, the content of the (PEG-240 / decyltetradeceth-20 / HDI) copolymer in the oil-in-water emulsified cosmetic of the present disclosure is 3% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic. And, the sticky feeling after application to the skin tends to be more suppressed.
From this point of view, the content of the (PEG-240 / decyltetradeceth-20 / HDI) copolymer in the oil-in-water emulsified cosmetic of the present disclosure is 3 with respect to the total mass of the oil-in-water emulsified cosmetic. It is preferably 1% by mass or less, more preferably 2% by mass or less, and further preferably 1.5% by mass or less.

[Trimethylglycine]
The oil-in-water emulsified cosmetics of the present disclosure contain trimethylglycine.
In the oil-in-water emulsified cosmetics of the present disclosure, trimethylglycine can contribute to the suppression of stickiness.

Trimethylglycine is a compound having the following structure.
Trimethylglycine may be referred to as glycine betaine, anhydrous betaine, or simply betaine. The cosmetic ingredient labeling name of trimethylglycine is betaine.

Trimethylglycine is an organic compound present in the living body.
Trimethylglycine can be obtained, for example, by extraction and purification from sugar beet molasses.

Trimethylglycine is also available as a commercial product.
Examples of commercially available products of trimethylglycine include Amicoat (trade name) manufactured by Asahi Kasei Chemicals Co., Ltd. and Betafin BP (trade name) manufactured by Ebisu Chemical Industry Co., Ltd.

The content of trimethylglycine in the oil-in-water emulsified cosmetics of the present disclosure is not particularly limited, but may be, for example, 0.1% by mass to 10% by mass with respect to the total mass of the oil-in-water emulsified cosmetics. preferable.
When the content of trimethylglycine in the oil-in-water emulsified cosmetic of the present disclosure is 0.1% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic, the sticky feeling after application to the skin is further suppressed. Tend to be.
From such a viewpoint, the content of trimethylglycine in the oil-in-water emulsified cosmetic of the present disclosure is preferably 0.1% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic. It is more preferably 5% by mass or more, and further preferably 1% by mass or more.
If the content of trimethylglycine in the oil-in-water emulsified cosmetic of the present disclosure is too high, the properties of the oil-in-water emulsified cosmetic tend to become hard. When the content of trimethylglycine in the oil-in-water emulsified cosmetic of the present disclosure is 10% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic, the dosage form of the oil-in-water emulsified cosmetic is gelled ("" Also called "gel". The same applies hereinafter.) It tends to be easier to make.
From such a viewpoint, the content of trimethylglycine in the oil-in-water emulsified cosmetic of the present disclosure is preferably 10% by mass or less, preferably 8% by mass or less, based on the total mass of the oil-in-water emulsified cosmetic. Is more preferable, and 5% by mass or less is further preferable.

[Stearyl glycyrrhetinate]
The oil-in-water emulsified cosmetic of the present disclosure contains stearyl glycyrrhetinate.
Stearyl glycyrrhetinate has improved solubility in fats and oils by ester-bonding stearyl alcohol to glycyrrhetinic acid, and as a component having an anti-inflammatory effect, cosmetics [that is, cosmetics and quasi-drugs (that is, cosmetics and quasi-drugs) For example, it is widely used in the field of cosmeceuticals)].

As the stearyl glycyrrhetinate, a commercially available product can be used.
Examples of commercially available products of stearyl glycyrrhetinate include Sea Augretinol (trade name) manufactured by Maruzen Pharmaceuticals Co., Ltd. and Stearyl glycyrrhetinate (trade name) manufactured by Alps Pharmaceutical Co., Ltd.

The content of stearyl glycyrrhetinate in the oil-in-water emulsified cosmetics of the present disclosure is not particularly limited, but is, for example, 0.01% by mass to 3% by mass with respect to the total mass of the oil-in-water emulsified cosmetics. Is preferable.
When the content of stearyl glycyrrhetinate in the oil-in-water emulsified cosmetic of the present disclosure is 0.01% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic, the anti-inflammatory effect of stearyl glycyrrhetinate is better. There is a tendency to enjoy it.
From such a viewpoint, the content of stearyl glycyrrhetinate in the oil-in-water emulsified cosmetic of the present disclosure is preferably 0.01% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic, and is 0. It is more preferably 3.03% by mass or more, and further preferably 0.05% by mass or more.
Further, when the content of stearyl glycyrrhetinate in the oil-in-water emulsified cosmetic of the present disclosure is 3% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic, the oil-in-water emulsified cosmetic is subjected to a low temperature environment. The precipitation of stearyl glycyrrhetinate, which may occur when placed in, tends to be more suppressed.
From such a viewpoint, the content of stearyl glycyrrhetinate in the oil-in-water emulsified cosmetic of the present disclosure is preferably 3% by mass or less, preferably 2% by mass, based on the total mass of the oil-in-water emulsified cosmetic. It is more preferably less than or equal to 1% by mass or less.

[Water-holding oil]
The oil-in-water emulsified cosmetic of the present disclosure includes a water-holding oil.
In the oil-in-water emulsified cosmetics of the present disclosure, the water-holding oil agent can contribute to the improvement of the moisturizing feeling.

The water-holding oil is not particularly limited as long as it is an oil that can hold water by itself, but it is preferable that the water-holding power measured in the following water-holding test is 100% or more. An oil having a water holding capacity of 100% or more means an oil that can hold water equal to or more than its own weight.

-Water holding test-
Weigh 10 g of the oil heated to 50 ° C. in a glass container and stir. Water at 50 ° C. is gradually added to the stirring oil until the water is drained from the oil, and then the mixture is left at room temperature (25 ° C.) for 24 hours. After leaving it to stand, the separated water is removed, and the amount of water (unit: g) embraced by the oil agent is measured. The measured amount of water is divided by the amount of oil (that is, 10 g) and multiplied by 100 to obtain the water holding capacity (unit:%).

Specific examples of the water-holding oil include di-lauroyl glutamate (phytosteryl / octyldodecyl), di-lauroyl glutamate (cholesteryl / octyldodecyl), dimergilinoleic acid di (isostearyl / phytosteryl), and dimergilinoleic acid (phytosteryl / isostearyl). / Cetyl / stearyl / behenyl), dipentaerythrityl tripolyhydroxystearate, tetra (hydroxystearic acid / isostearic acid) dipentaerythrityl, di lauroyl glutamate (cholesteryl / behenyl / octyldodecyl), di (octyldodecyl / phytosteryl / behenyl) lauroyl glutamate, myristol Methyl-β-alanine (phytosteryl / decyltetradecyl), cholesteryl hydroxystearate, phytosteryl hydroxystearate, phytosteryl oleate, sunflower seed phytosteryl, lanolin wax, phytosteryl isostearate, dipentaerytod fatty acid ester (1), dipentaeri Examples thereof include todd fatty acid ester (2), dipentaerytod hexaoxystearate, and (ethylhexanoic acid / stearic acid / adipic acid) glyceryl. All of the water-holding oils mentioned as specific examples have a water-holding power of 100% or more as measured in the above-mentioned water-holding test.
Among these, as water-holding oils, di-lauroyl glutamate (phytosteryl / octyldodecyl), di lauroyl glutamate (cholesteryl / octyldodecyl), dimer dilinoleate di (isostearyl / phytosteryl), from the viewpoint of market performance and market availability. ), Dimer dilinoleate di (phytosteryl / isostearyl / cetyl / stearyl / behenyl), dipentaerythrityl tripolyhydroxystearate, and tetra (hydroxystearic acid / isostearic acid) dipentaerythrityl, preferably at least one selected from the group. Glutamic acid di (phytosteryl / octyldodecyl) is more preferred.

As the water-holding oil, a commercially available product can be used.
Examples of commercially available water-holding oils are Eldu (registered trademark) PS-203, Eldu (registered trademark) CL-202, Eldu (registered trademark) APS-307, and Eldu (registered trademark) CL manufactured by Ajinomoto Co., Inc. -391, Eldu (registered trademark) PC-304, LUSPARN (registered trademark) PI-DA, Plandoll (registered trademark) -S, Plandoll (registered trademark) -H, Plandool (registered trademark) manufactured by Nippon Seika Co., Ltd. )-SUN, Plandool®-ISS, and Sarakos (registered trademark) WO-6, Cosmall (registered trademark) 168EV, Sarakos (registered trademark) HS, Sarakos (registered trademark) manufactured by Nisshin Oillio Co., Ltd. ) FH, Sarakos® PO (T), Kosumor® 168AR, Kosumor® 168M, and Nomcoat® LAH.

The oil-in-water emulsified cosmetic of the present disclosure may contain only one type of water-holding oil agent, or may contain two or more types.

The content of the water-holding oil in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited, but is, for example, 0.1% by mass to 10% by mass with respect to the total mass of the oil-in-water emulsified cosmetic. Is preferable.
When the content of the water-holding oil in the oil-in-water emulsified cosmetic of the present disclosure is 0.1% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic, better moisturizing after application to the skin. There is a tendency to get a feeling.
From such a viewpoint, the content of the water-holding oil in the oil-in-water emulsified cosmetic of the present disclosure is preferably 0.1% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic, and is 0. It is more preferably 3% by mass or more, further preferably 0.5% by mass or more, and particularly preferably 1% by mass or more.
Further, when the content of the water-holding oil in the oil-in-water emulsified cosmetic of the present disclosure is 10% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic, the sticky feeling after application to the skin becomes more. Tends to be suppressed.
From such a viewpoint, the content of the water-holding oil in the oil-in-water emulsified cosmetic of the present disclosure is preferably 10% by mass or less, preferably 8% by mass, based on the total mass of the oil-in-water emulsified cosmetic. It is more preferably 5% by mass or less, and particularly preferably 3% by mass or less.

[Thickening polysaccharide]
The oil-in-water emulsified cosmetics of the present disclosure contain thickening polysaccharides.
In the oil-in-water emulsified cosmetics of the present disclosure, the thickening polysaccharide may contribute to the improvement of the stability over time of the oil-in-water emulsified cosmetics.

The thickening polysaccharide is not particularly limited.
Thickening polysaccharides include polysaccharides and their derivatives.
The thickening polysaccharide may be a polysaccharide derived from a natural product and a derivative thereof, or may be a polysaccharide obtained by chemical synthesis and a derivative thereof. Here, natural products include animals, plants, and microorganisms.
Derivatives of polysaccharides used as thickening polysaccharides include those in which an alkyl group, a polyethylene oxide group, a polypropylene oxide group, etc. are bonded to a part of a sugar in the polysaccharide, a single substance such as glucose, lactose, sucrose, or them. Examples thereof include those to which a polymer having a sugar as a constituent unit is bound.

Specific examples of thickening polysaccharides include gellan gum, carrageenan, alkasilan, xanthan gum, pullulan, locust bean gum, hydroxypropyl xanthan gum, guar gum, hydroxypropyl guar gum, Na acrylate graft starch, gum arabic, karaya gum, tamarind gum, and Hydroxylethyl cellulose can be mentioned.
Among these, thickening polysaccharides include, for example, gellan gum, carrageenan, alkasilan, xanthan gum, purulan, locust bean gum, from the viewpoint of ease of application of various dosage forms to oil-in-water emulsified cosmetics. At least one selected from the group consisting of hydroxypropyl xanthan gum, guar gum, hydroxypropyl guar gum, and Na-acrylic acid graft starch is preferable.
The thickening polysaccharide is at least selected from the group consisting of gellan gum, carrageenan, alkasilan, xanthan gum, pullulan, and locust bean gum, for example, from the viewpoint of stability over time and usability of oil-in-water emulsified cosmetics. One is preferred, at least one selected from gellan gum and alkathyran is more preferred, and gellan gum is even more preferred.

The oil-in-water emulsified cosmetic of the present disclosure may contain only one type of thickening polysaccharide, or may contain two or more types.

The content of the thickening polysaccharide in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited, but is, for example, 0.05% by mass to 3% by mass with respect to the total mass of the oil-in-water emulsified cosmetic. Is preferable.
When the content of the thickening polysaccharide in the oil-in-water emulsified cosmetic of the present disclosure is 0.05% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic, the oil-in-water emulsified cosmetic is stable over time. The sex tends to improve.
From such a viewpoint, the content of the thickening polysaccharide in the oil-in-water emulsified cosmetic of the present disclosure is preferably 0.05% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic. It is more preferably 0.08% by mass or more, and further preferably 0.1% by mass or more.
Further, when the content of the thickening polysaccharide in the oil-in-water emulsified cosmetic of the present disclosure is 3% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic, a sticky feeling after application to the skin is obtained. Tends to be more suppressed.
From such a viewpoint, the upper limit of the content of the thickening polysaccharide in the oil-in-water emulsified cosmetic of the present disclosure is preferably 3% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic. It is more preferably 2% by mass or less, further preferably 1% by mass or less, and particularly preferably 0.8% by mass or less.

[Acrylic polymer]
The oil-in-water emulsified cosmetic of the present disclosure contains an acrylic polymer.
In the oil-in-water emulsified cosmetics of the present disclosure, the acrylic polymer can contribute to the improvement of the stability over time of the oil-in-water emulsified cosmetics.

In the present disclosure, the "acrylic polymer" means a polymer containing a structural unit derived from a monomer having a (meth) acryloyl group. Further, in the present disclosure, "(meth) acryloyl" is a term that includes both "acryloyl" and "methacryloyl".

The weight average molecular weight of the acrylic polymer is not particularly limited, but is preferably 5,000 to 20,000,000, more preferably 10,000 to 10,000,000, for example.
The weight average molecular weight of the acrylic polymer is measured by gel permeation chromatography (GPC) method using polystyrene as a standard substance.

Specific examples of acrylic polymers include (Acryloyl / alkyl acrylate (C10-30)) copolymers, carboxyvinyl polymers, (Na acrylate / Na acryloyldimethyltaurine) copolymers, (acryloyldimethyltaurinammonium / VP) copolymers, ( Examples include acryloyldimethyltaurinammonium / carboxyethylammonium acrylate) crosspolymers and (acryloyldimethyltaurinammonium / behenes-25 methacrylate) crosspolymers.
Among these, acrylic polymers include, for example, (Acrylate / alkyl acrylate (C10-30)) copolymers and carboxyvinyls from the viewpoint of ease of application of various dosage forms to oil-in-water emulsified cosmetics. At least one selected from the group consisting of a polymer, a (Na acrylate / Na acryloyldimethyltaurine) copolymer, a (Acryloyldimethyltaurinammonium / VP) copolymer, and a (Acryloyldimethyltaurineammonium / Carboxyethylammonium acrylate) crosspolymer is preferable. ..
Further, as the acrylic polymer, for example, from the viewpoint that a better moisturizing feeling can be obtained after application to the skin, a (Acryloyl / alkyl acrylate (C10-30)) copolymer, a carboxyvinyl polymer, and (acryloyl). At least one selected from the group consisting of dimethyltaurine ammonium / VP) copolymers is preferred.
"VP" is an abbreviation for vinylpyrrolidone.

As the acrylic polymer, a commercially available product can be used.
Examples of commercially available acrylic polymers include Pemulen (registered trademark) TR-2, Pemulen (registered trademark) TR-1, Carbopol (registered trademark) Ultrez 20 Polymer, Carbopol (registered trademark) manufactured by Lubrizol Co., Ltd. Ultrez 21 Polymer, Carbopol (registered trademark) Ultrez 10, Carbopol (registered trademark) ETD 2020 Polymer, Carbopol (registered trademark) ETD 2050 Polymer, and Carbopol (registered trademark) 1382P. ) AVC, Aristoflex® HMB, and Aristoflex® TAC, as well as SEPPIC S.A. A. SIMULGEL® EG manufactured by the company can be mentioned.

The oil-in-water emulsified cosmetic of the present disclosure may contain only one kind of acrylic polymer, or may contain two or more kinds of acrylic polymers.

The content of the acrylic polymer in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited, but is, for example, 0.05% by mass to 3% by mass with respect to the total mass of the oil-in-water emulsified cosmetic. Is preferable.
When the content of the acrylic polymer in the oil-in-water emulsified cosmetic of the present disclosure is 0.05% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic, the stability of the oil-in-water emulsified cosmetic over time Tends to improve.
From such a viewpoint, the content of the acrylic polymer in the oil-in-water emulsified cosmetic of the present disclosure is preferably 0.05% by mass or more with respect to the total mass of the oil-in-water emulsified cosmetic, and is 0. It is more preferably .08% by mass or more, and further preferably 0.1% by mass or more.
Further, when the content of the acrylic polymer in the oil-in-water emulsified cosmetic of the present disclosure is 3% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic, the sticky feeling after application to the skin becomes more. Tends to be suppressed.
From such a viewpoint, the upper limit of the content of the acrylic polymer in the oil-in-water emulsified cosmetic of the present disclosure is preferably 3% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic. It is more preferably 1% by mass or less, and further preferably 1% by mass or less.

〔water〕
The oil-in-water emulsified cosmetics of the present disclosure include water.
The water is not particularly limited as long as it can be used for cosmetics.
Specific examples of water include natural water, purified water, distilled water, ion-exchanged water, pure water, and ultrapure water [for example, Milli-Q® water].
Among these, as water, purified water, distilled water, ion-exchanged water, pure water, or ultrapure water is preferable from the viewpoint of having few impurities.

The content of water in the oil-in-water emulsified cosmetics of the present disclosure is not particularly limited, but is preferably 50% by mass to 99% by mass, preferably 60% by mass, based on the total mass of the oil-in-water emulsified cosmetics, for example. It is more preferably from mass% to 97% by mass, and even more preferably from 70% by mass to 95% by mass.

[Surfactant]
The oil-in-water emulsified cosmetics of the present disclosure do not contain a surfactant, or the content of the surfactant exceeds 0% by mass with respect to the total mass of the oil-in-water emulsified cosmetics to 0.5 mass. % Or less, and does not contain a surfactant, or the content of the surfactant exceeds 0% by mass and 0.3% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic. It is preferable that the surfactant is not contained, or the content of the surfactant is in the range of more than 0% by mass and 0.1% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic. It is more preferable that the surfactant is not contained, or the content of the surfactant is in the range of more than 0% by mass and 0.05% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic. It is more preferable to have it, and it is particularly preferable that it does not contain a surfactant.
The oil-in-water emulsified cosmetics of the present disclosure do not contain a surfactant, or the content of the surfactant exceeds 0% by mass with respect to the total mass of the oil-in-water emulsified cosmetics to 0.5 mass. When it is in the range of% or less, the sticky feeling after application to the skin tends to be suppressed.
Further, the oil-in-water emulsified cosmetics of the present disclosure do not contain a surfactant, or the content of the surfactant exceeds 0% by mass based on the total mass of the oil-in-water emulsified cosmetics. When it is in the range of 5% by mass or less, the irritation to the skin by the surfactant does not occur, or the irritation to the skin by the surfactant is unlikely to occur.

The surfactant is not particularly limited.
Examples of the surfactant include components generally used as a surfactant in the field of cosmetics [that is, cosmetics and quasi-drugs (for example, medicated cosmetics)].
The surfactant may be any of an anionic surfactant, a cationic surfactant, an amphoteric surfactant, or a nonionic surfactant, or a combination thereof.
In general, ionic surfactants are concerned about irritation to the skin.
The oil-in-water emulsified cosmetics of the present disclosure do not contain a surfactant, or the content of the surfactant exceeds 0% by mass with respect to the total mass of the oil-in-water emulsified cosmetics to 0.5 mass. % Or less, even if the surfactant is at least one ionic surfactant selected from the group consisting of anionic surfactants, cationic surfactants, and amphoteric surfactants. There is no irritation to the skin due to the surfactant, or the irritation to the skin due to the surfactant is unlikely to occur.

[Ester oil]
The oil-in-water emulsified cosmetic of the present disclosure preferably further contains an ester oil.
In the oil-in-water emulsified cosmetics of the present disclosure, the ester oil can contribute to the improvement of the manufacturing aptitude of the oil-in-water emulsified cosmetics.

The ester oil is not particularly limited, but is preferably a low-viscosity ester oil, for example, from the viewpoint of improving the manufacturing aptitude of the oil-in-water emulsified cosmetic.
In the present disclosure, the "low viscosity ester oil" means an ester oil having a viscosity of 100 mPa · s or less at 25 ° C. The viscosity of the ester oil is a value measured using a B-type viscometer.

Specific examples of the ester oil include triethylhexanoin, tri (caprylic acid / capric acid) glyceryl, isopropyl palmitate, isotridecyl isononanoate, cetyl ethylhexanoate, octyldodecyl myristate, isopropyl myristate, isosetyl myristate, and palmitic acid. Ethylhexyl, hexyldecyl ethylhexanate, isostearyl neopentate, octyldodecyl neopentanoate, isotridecyl isononanoate, isopropyl isostearate, isopropyl palmitate, isononyl isononanoate, isodecyl neopentanoate, neopentyl glycol dicaprate, neopentyl glycol diethylhexanate. , PG dicaprinate, PG dicaprylate, trimethylolpropane triethylhexanoate, pentaerythrityl tetraethylhexanoate, and hexyldecyl isostearate. The above-mentioned "PG" is an abbreviation for propylene glycol. The ester oils mentioned as specific examples are all low-viscosity ester oils.
Among these, ester oils include, for example, triethylhexanoin, tri (caprylic acid / capric acid) glyceryl, isopropyl palmitate, isotridecyl isononanoate, cetyl ethylhexanoate, and myristic acid from the viewpoint of usability and market performance. At least one selected from the group consisting of octyldodecyl is preferred.

When the oil-in-water emulsified cosmetic of the present disclosure contains ester oil, it may contain only one type of ester oil, or may contain two or more types of ester oil.

The content of the ester oil in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited.
When the oil-in-water emulsified cosmetic of the present disclosure contains ester oil, the content of the ester oil is preferably 0.1% by mass to 15% by mass with respect to the total mass of the oil-in-water emulsified cosmetic. , 0.2% by mass to 10% by mass, more preferably 0.5% by mass to 5% by mass.

[Hydrocarbon oil]
The oil-in-water emulsified cosmetic of the present disclosure preferably further contains a hydrocarbon oil.
In the oil-in-water emulsified cosmetics of the present disclosure, the hydrocarbon oil can contribute to the improvement of the moisturizing feeling.

Specific examples of the hydrocarbon oil include petrolatum, microcrystalline wax, hydrogenated polyisobutene, selecin, beeswax, candelilla wax, shea butter, jojoba seed oil, hydroxystearic acid, squalane, and liquid paraffin.
Among these, hydrocarbon oils include, for example, petrolatum, microcrystallin wax, hydrogenated polyisobutene, ceresin, honeydew, candelilla wax, shea butter, jojoba seed oil, and hydroxystearic acid from the viewpoint of improving the moisturizing feeling. At least one selected from the above group is preferable, and petrolatum is more preferable.

When the oil-in-water emulsified cosmetic of the present disclosure contains a hydrocarbon oil, it may contain only one type of hydrocarbon oil, or may contain two or more types of hydrocarbon oil.

The content of the hydrocarbon oil in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited.
When the oil-in-water emulsified cosmetic of the present disclosure contains hydrocarbon oil, the content of the hydrocarbon oil shall be 0.1% by mass to 15% by mass with respect to the total mass of the oil-in-water emulsified cosmetic. Is more preferable, 0.2% by mass to 10% by mass is more preferable, and 0.5% by mass to 5% by mass is further preferable.

[Other ingredients]
The oil-in-water emulsified cosmetics of the present disclosure may contain components other than the above-mentioned components (so-called other components), if necessary, as long as the effects of the present disclosure are not impaired.
Examples of other components include additive components usually used in cosmetics (hereinafter, also simply referred to as “additive components”).

<Additional ingredients>
The oil-in-water emulsified cosmetics of the present disclosure may contain additive components.
Examples of the additive component include functional components that exhibit useful beauty effects (moisturizing effect, whitening effect, skin conditioning effect, etc.) when used in cosmetics (so-called cosmetics and cosmeceuticals).
Such functional components include ascorbic acid derivatives such as L-ascorbic palmitate; carotenoids such as β-carotene, astaxanthin, zeaxanthin, lycopene and lutein; vitamin E such as tocopherol and tocotrienol; retinol derivatives such as retinol palmitate. Ubiquinone such as coenzyme Q10; Polyhydric alcohols such as glycerin, 1,3-butylene glycol (cosmetic ingredient display name: BG), dipropylene glycol (DPG); hyaluronic acid, erythritol, xylitol, glucose, sorbitol, trehalose, etc. Polysaccharides; Sphingo glycolipids such as glucosylceramide and galactosylceramide; Collagen such as hydrolyzed collagen and water-soluble collagen; Amino acids such as acetylhydroxyproline; Hydrolyzed sirovanalupin protein; Chrysanthemum extract; dipotassium glycyrrhizinate and the like can be mentioned.
Additives other than the above include antioxidants, silicone oils (cyclopentasiloxane, dimethicone, etc.), buffers (citric acid, phosphoric acid, etc.), pH regulators (sodium hydroxide, potassium hydroxide, hydrochloric acid, etc.), Preservatives (phenoxyethanol, ethylhexylglycerin, etc.), UV absorbers, anti-inflammatory agents, colorants, fragrances and the like can be mentioned.
These additive components may have one component having two or more functions.

When the oil-in-water emulsified cosmetic of the present disclosure contains gellan gum as a thickening polysaccharide, it is preferable that the oil-in-water emulsified cosmetic contains a salt such as sodium chloride, potassium chloride, or calcium chloride as an additive component. By using gellan gum and salt in combination, the strength of the gel can be further improved when the dosage form of the oil-in-water emulsified cosmetic is made into a gel.

When the oil-in-water emulsified cosmetic of the present disclosure contains other ingredients, it may contain only one kind of other ingredients, or may contain two or more kinds of other ingredients.

When the oil-in-water emulsified cosmetic of the present disclosure contains other components, the content of the other components is not particularly limited and can be appropriately set according to the purpose.

-Average particle size of emulsified particles-
The average particle size of the emulsified particles in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited, but is, for example, preferably 15 μm or less, more preferably 10 μm or less, still more preferably 6 μm or less. ..
The lower limit of the average particle size of the emulsified particles in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited, but is preferably 1 μm or more, for example.

In the present disclosure, the "average particle size" of the emulsified particles means the volume average particle size.
The average particle size of the emulsified particles is measured by a dynamic light scattering method using an oil-in-water emulsified cosmetic diluted 10-fold with ultrapure water and using a particle size distribution meter.
As the particle size distribution meter, for example, Nanotrack UPA (trade name) manufactured by Microtrac Bell Co., Ltd. can be preferably used. However, the particle size distribution meter is not limited to this.

[Use of underwater oil-type emulsified cosmetics]
The oil-in-water emulsified cosmetics of the present disclosure can be suitably used as cosmetics or quasi-drugs (so-called medicated cosmetics).

[Dosage form of oil-in-water emulsified cosmetics]
The dosage form of the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited.
Examples of the dosage form of the oil-in-water emulsified cosmetic of the present disclosure include liquid, gel, milky lotion, cream and the like.

[Manufacturing method of oil-in-water emulsified cosmetics]
The method for producing the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited.
The oil-in-water emulsified cosmetics of the present disclosure include (PEG-240 / decyltetradeceth-20 / HDI) copolymers, trimethylglycine, stearyl glycyrrhetinate, water-holding oils, thickening polysaccharides, and acrylics. It can be produced according to a known method for producing an oil-in-water emulsified cosmetic using a polymer, water,, if necessary, an ester oil, a hydrocarbon oil, and the above-mentioned additive components.

Preferred methods for producing the oil-in-water emulsified cosmetics of the present disclosure include, for example, at least a (PEG-240 / decyltetradeceth-20 / HDI) copolymer, trimethylglycine, a thickening polysaccharide, an acrylic polymer, and water. It is a method of mixing an aqueous phase composition and an oil phase composition containing at least stearyl glycyrrhetinate and a water-holding oil agent to carry out emulsification and dispersion.

The aqueous phase composition is, for example, an additive component to be blended with, for example, a (PEG-240 / decyltetradeceth-20 / HDI) copolymer, trimethylglycine, a thickening polysaccharide, an acrylic polymer, water, and optionally. Of these, it can be prepared by mixing with an aqueous additive component.
When preparing the aqueous phase composition, all the components contained in the aqueous phase composition may be mixed at once, or each component contained in the aqueous phase composition may be mixed in several portions. ..
The components to be blended in the aqueous phase composition may be simply mixed in the aqueous phase composition, but are preferably uniformly mixed.
The mixing method is not particularly limited.
Examples of the mixing method include a method of mixing by stirring.
A general agitator or agitator can be used for agitation.

The stirring temperature is not particularly limited, but is preferably set to 100 ° C. or lower, more preferably 60 ° C. to 90 ° C., for example, from the viewpoint of preventing bumping.
The means for adjusting the temperature is not particularly limited.
As a means for adjusting the temperature, a general heating device (for example, a water bath) can be used.
The stirring time is not particularly limited and can be appropriately set according to the type of stirring device or stirring device, the composition of the aqueous phase composition, and the like.
As an example of a preferable embodiment of the stirring temperature and the stirring time, there is an embodiment in which the stirring temperature is 80 ° C. and the stirring time is 1 hour.

The oil phase composition is prepared, for example, by mixing stearyl glycyrrhetinate, a water-holding oil, and an oil-based additive component (eg, ester oil, hydrocarbon oil, etc.) among the additive components to be blended as desired. can.
When preparing the oil phase composition, all the components contained in the oil phase composition may be mixed at once, or each component contained in the oil phase composition may be mixed in several portions. ..
The components to be blended in the oil phase composition may be simply mixed in the oil phase composition, but are preferably uniformly mixed.
The mixing method is not particularly limited.
Examples of the mixing method include a method of mixing by stirring.
A general agitator or agitator can be used for agitation.

The stirring temperature is not particularly limited, but is preferably set to, for example, 60 ° C to 90 ° C.
The means for adjusting the temperature is not particularly limited.
As a means for adjusting the temperature, a general heating device (for example, a water bath) can be used.
The stirring time is not particularly limited and can be appropriately set according to the type of stirring device or stirring device, the composition of the oil phase composition, and the like.
As an example of a preferable embodiment of the stirring temperature and the stirring time, there is an embodiment in which the stirring temperature is 80 ° C. and the stirring time is 1 hour.

The method of emulsification and dispersion is not particularly limited.
The oil phase composition and the aqueous phase composition may be mixed at once to emulsify and disperse, but the aqueous phase composition is stirred and the oil phase composition is gradually added to the stirring aqueous phase composition. It is preferable to mix while adding to carry out emulsification and dispersion.
At the time of emulsification and dispersion, for example, ordinary emulsification means utilizing a shearing action such as a stirrer, an impeller, a homomixer, and a continuous flow type shearing device can be used.
Emulsification and dispersion may be performed a plurality of times for the purpose of further making the particle size uniform.

The ratio of the oil phase composition to the aqueous phase composition (oil phase composition / aqueous phase composition) is not particularly limited, but is preferably 1/99 to 50/50 on a mass basis, for example, 3 It is more preferably / 97 to 40/60, further preferably 5/95 to 30/70, and particularly preferably 10/90 to 20/80.

Hereinafter, the oil-in-water emulsified cosmetics of the present disclosure will be described in more detail with reference to Examples. However, the oil-in-water emulsified cosmetics of the present disclosure are not limited to the following examples as long as the gist is not exceeded.

[Manufacturing of oil-in-water emulsified cosmetics]
[Example 1]
Among the components listed in Table 1 below, (PEG-240 / decyltetradeceth-20 / HDI) copolymer, trimethylglycine, gellan gum, which is a thickening polysaccharide, and acrylic polymers (Acrylate / acrylic). Acrylic acid (C10-30)) copolymer, water and other aqueous additives are placed in a container and stirred in a water bath at 80 ° C. for 1 hour with a stirrer to form an aqueous phase composition. Got
Next, among the components listed in Table 1 below, stearyl glycyrrhetinate, di (phytosteryl / octyldodecyl) lauroyl glutamate as a water-holding oil, triethylhexanoin as an ester oil, and petrolatum as a hydrocarbon oil. And other oily additive components were placed in a container and stirred in a water bath at 80 ° C. for 1 hour using a stirrer to obtain an oil phase composition.
Next, the aqueous phase composition is stirred using a vacuum emulsification stirring device [model: PVQ-3 / 7UN, manufactured by Mizuho Kogyo Co., Ltd.], and a small amount of the oil phase composition is added to the stirring aqueous phase composition. The oil-in-water emulsified cosmetic of Example 1 was obtained by mixing while adding them one by one.

[Examples 2 to 8]
In Example 1, the same operation as in Example 1 was performed except that the composition of the oil-in-water emulsified cosmetic was changed to the composition shown in Table 1, and each oil-in-water emulsified product in Examples 2 to 8 was emulsified. I got a cosmetic.

[Examples 9 to 22]
In Example 1, the same operation as in Example 1 was performed except that the composition of the oil-in-water emulsified cosmetic was changed to the composition shown in Table 2, and each oil-in-water emulsified product of Examples 9 to 22 was emulsified. I got a cosmetic.

[Comparative Example 1 to Comparative Example 6]
In Example 1, the same operation as in Example 1 was performed except that the composition of the oil-in-water emulsified cosmetic was changed to the composition shown in Table 3, and each oil-in-water emulsified product of Comparative Examples 1 to 6 was emulsified. I got a cosmetic.

[Measurement of average particle size]
The average particle size of the emulsified particles in each of the oil-in-water emulsified cosmetics of Examples 1 to 22 was measured by the method shown below.
Immediately after preparation (within 24 hours from preparation), the oil-in-water emulsified cosmetic was diluted 20-fold with distilled water. Next, the average particle size (volume average particle size) of the emulsified particles in the diluted oil-in-water emulsified cosmetic was measured in an environment with an ambient temperature of 25 ° C., using a particle size distribution meter laser diffraction / scattering type particle size distribution measuring device [model: LA-960, manufactured by HORIBA, Ltd.] was used to measure the particle size distribution. As a result, the average particle size of the emulsified particles in each of the oil-in-water emulsified cosmetics of Examples 1 to 22 was in the range of 2 μm to 6 μm.

[evaluation]
The oil-in-water emulsified cosmetics of Examples 1 to 22 and Comparative Examples 1 to 6 were evaluated as shown below. The results are shown in Tables 1 to 3.

1. 1. Stability over time The stability over time of oil-in-water emulsified cosmetics was evaluated using the changes in viscosity and appearance (specifically, separation) of the oil-in-water emulsified cosmetics as indicators.
First, the viscosity of the oil-in-water emulsified cosmetic on the day after preparation at 25 ° C. (unit: mPa · s; hereinafter the same) was measured. The viscosity obtained here is referred to as "initial viscosity".
The viscosity was measured using a B-type viscometer [trade name: TVB-10M-type viscometer, manufactured by Toki Sangyo Co., Ltd.] as a measuring device, and the rotor used: No. 4 and the number of revolutions: 6 rpm (revolutions per minute).
In addition, 70 g of the oil-in-water emulsified cosmetic immediately after preparation was weighed, placed in a glass bottle and sealed to prepare a storage sample. The prepared storage sample was stored in a constant temperature bath set at 50 ° C. One month after storage, the storage sample was taken out from the constant temperature bath, and the oil-in-water emulsified cosmetic in the glass bottle was visually observed to confirm the presence or absence of separation. Then, for the oil-in-water emulsified cosmetics for which separation was not confirmed, the viscosity at 25 ° C. was measured by the same method as described above. The viscosity obtained here is called "viscosity over time".
From the initial viscosity and the viscosity over time, the viscosity change rate (%) was calculated based on the following formula (1).

Viscosity change rate (%) = [(initial viscosity-viscosity over time) / initial viscosity] × 100 ・ ・ ・ Equation (1)

If the separation was not confirmed by the above observation and the viscosity change rate was less than 30%, it was judged that the oil-in-water emulsified cosmetic had excellent stability over time. In Tables 1 to 3, when the viscosity change rate is less than 30%, it is described as "stable", and when the viscosity change rate is 30% or more, it is described as "unstable", and the separation is confirmed. The case was described as "separation".

2. 2. Usability The following (1) and (2) usability were evaluated for the oil-in-water emulsified cosmetics. In the above evaluation of "1. Stability over time", those evaluated as "unstable" or "separation" were not evaluated for usability.

(1) Stickiness As one of the feelings of using the oil-in-water emulsified cosmetic, the stickiness was evaluated.
After having three evaluation monitors spread the oil-based emulsified cosmetics immediately after preparation on the face with their fingers in an environment with an atmosphere temperature of 25 ° C and 50% RH, they touched the skin of the spread part with their hands. I asked them to judge the presence and degree of stickiness.
After ranking the judgment results of each evaluation monitor according to the following evaluation criteria, the evaluation points of each rank are A: 4 points, B: 3 points, C: 2 points, D: 1 points, and the evaluation of 3 people. The average value of the points was calculated. When calculating the average value, the first digit after the decimal point was rounded off. Then, the evaluation rank corresponding to the average value was used as the evaluation result.
If the evaluation result was "A", "B", or "C", it was determined that the oil-in-water emulsified cosmetic had suppressed stickiness after being applied to the skin. The best evaluation rank is "A".

-Evaluation criteria-
A: I don't feel any stickiness.
B: The stickiness is slightly felt, but it is a level that does not bother me.
C: Stickiness is felt, but it is an acceptable level D: Stickiness is strongly felt.

(2) Moisturizing sensation The moisturizing sensation was evaluated as one of the feelings of using the oil-in-water emulsified cosmetic.
We asked three evaluation monitors to spread the oil-based emulsified cosmetics immediately after preparation on the face with their fingers in an environment with an atmosphere temperature of 25 ° C and 50% RH, and one minute after spreading, on the surface of the skin. We asked them to judge the presence and degree of the remaining moist feeling (so-called moisturizing feeling).
After ranking the judgment results of each evaluation monitor according to the following evaluation criteria, the evaluation points of each rank are A: 4 points, B: 3 points, C: 2 points, D: 1 points, and the evaluation of 3 people. The average value of the points was calculated. When calculating the average value, the first digit after the decimal point was rounded off. Then, the evaluation rank corresponding to the average value was used as the evaluation result.
If the evaluation result was "A", "B", or "C", it was determined that the oil-in-water emulsified cosmetic had suppressed stickiness after being applied to the skin. The best evaluation rank is "A".

-Evaluation criteria-
A: The moist feel that remains on the surface of the skin is very strong.
B: The moist feel that remains on the surface of the skin is strong.
C: There is a slight moist feeling that remains on the surface of the skin.
D: There is no moist feeling left on the surface of the skin.

In Tables 1 to 3, "-" described in the column of composition means that the corresponding component is not contained.
In Table 3, "-" in the evaluation column means that the corresponding evaluation was not performed.
In Tables 1 to 3, for convenience, (PEG-240 / decyltetradeceth-20 / HDI) copolymer, trimethylglycine, stearyl glycyrrhetinate, water-holding oil, thickening polysaccharide, acrylic polymer, water, ester oil, The components corresponding to the hydrocarbon oil and other components are "(A)", "(B)", "(C)", "(D)", "(E)", and "(F)", respectively. , "(G)", "(H)", "(I)", and "(J)".

The details of each component shown in Tables 1 to 3 are as follows.
<(A): (PEG-240 / decyltetradeceth-20 / HDI) copolymer>
-(PEG-240 / decyltetradeceth-20 / HDI) copolymer [trade name: Adecanol (registered trademark) GT-700, manufactured by ADEKA Corporation]
<(B): Trimethylglycine>
-Trimethylglycine [Product name: Amino Coat (registered trademark), manufactured by Asahi Kasei Finechem Co., Ltd.]
<(C): Stearyl glycyrrhetinate>
・ Stearyl glycyrrhetinate [Product name: Sea Augretinol (registered trademark), manufactured by Maruzen Pharmaceuticals Co., Ltd.]

<(D): Water-holding oil>
-Di lauroyl glutamate (phytosteryl / octyldodecyl) [Product name: Eldu (registered trademark) PS-203, manufactured by Ajinomoto Co., Inc.]
-Di lauroyl glutamate (cholesteryl / octyldodecyl) [Product name: Eldu (registered trademark) CL-202, manufactured by Ajinomoto Co., Inc.]
・ Dimarilinoleate di (isostearyl / phytosteryl) [Product name: LUSPARN (registered trademark) PI-DA, manufactured by Nippon Fine Chemical Co., Ltd.]
-Dimer dilinoleate di (phytosteryl / isostearyl / cetyl / stearyl / behenyl) [trade name: Plandol (registered trademark) -S, manufactured by Nippon Fine Chemical Co., Ltd.]
-Dipentaerythrityl tripolyhydroxystearate [Product name: Sarakos (registered trademark) WO-6, manufactured by Nisshin Oillio Co., Ltd.]
-Tetra (hydroxystearic acid / isostearic acid) dipentaerythrityl [trade name: Cosmol (registered trademark) 168EV, manufactured by Nisshin Oillio Co., Ltd.]

<(E): Thickening polysaccharide>
・ Gellan gum [Product name: KELCOGEL (registered trademark) CG-HA, manufactured by Sansho Co., Ltd.]
・ Carrageenan [Product name: GENUGEL (registered trademark) SWG-J, manufactured by Sansho Co., Ltd.]
・ Alcasea Run [Product name: Alcasea Run, manufactured by Hakuto Co., Ltd.]
・ Pullulan [Product name: Pullulan for cosmetics, manufactured by Hayashibara Co., Ltd.]
・ Locust bean gum / xanthan gum [Product name: Nomcoat (registered trademark) CG, manufactured by Nisshin Oillio Co., Ltd.]

<(F): Acrylic polymer>
-(Acrylate / alkyl acrylate (C10-30)) copolymer [trade name: Pemulen (registered trademark) TR-2, manufactured by Lubrizol Co., Ltd.]
-Carboxyvinyl polymer [Product name: Carbopol (registered trademark) ETD 2050 Polymer, manufactured by Lubrizol Co., Ltd.]
-(Acryloyldimethyltaurine ammonium / VP) copolymer [Product name: Acryloylx (registered trademark) AVC, manufactured by Clariant Japan Co., Ltd.]

<(G): Water>
・ Water (purified water)
<(H): Ester oil>
-Triethylhexanoin [Product name: T.I. I. O, manufactured by Nisshin Oillio Co., Ltd.]
<(I): Hydrocarbon oil>
・ Vaseline [Product name: Sun White (registered trademark) P-200, manufactured by Nikko Rica Co., Ltd.]

<(J): Other ingredients>
・ Sodium chloride [manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.]
・ Glycerin [manufactured by Sakamoto Pharmaceutical Co., Ltd.] (polyhydric alcohol)
・ BG [manufactured by Daicel Chemical Co., Ltd.] (polyhydric alcohol)
・ DPG [manufactured by Koyo Fine Chemicals Co., Ltd.] (polyhydric alcohol)
・ Water-soluble collagen [Product name: Collagen P (PF), manufactured by Nitta Gelatin Co., Ltd.]
-Hydrolyzed collagen [Product name: Collagen Tripeptide F, manufactured by Zerice Co., Ltd.]
・ Acetyl hydroxyproline [Product name: AHYP, manufactured by Kyowa Hakko Bio Co., Ltd.]
・ Tocopherol [Product name: RIKEN E Oil 800, manufactured by RIKEN CORPORATION]
-Retinol palmitate [Product name: RIKEN A Palmitate 1000 (E), manufactured by RIKEN Vitamin Co., Ltd.]
・ Phenoxyethanol [manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.] (preservative)
・ Potassium hydroxide [manufactured by Wako Pure Chemical Industries, Ltd.] (pH adjuster)
-PEG-60 hydrogenated castor oil [manufactured by Nikko Chemicals Co., Ltd.] (surfactant)

As shown in Tables 1 and 2, it was confirmed that the oil-in-water emulsified cosmetics of Examples were both excellent in stability over time. Further, it was confirmed that all of the oil-in-water emulsified cosmetics of the examples have a good feeling of use because the sticky feeling after being applied to the skin is suppressed and the moisturizing feeling is obtained after being applied to the skin. Was done.

On the other hand, as shown in Table 3, the oil-in-water emulsified cosmetic of Comparative Example 1 containing no (PEG-240 / decyltetradeceth-20 / HDI) copolymer was compared with the oil-in-water emulsified cosmetic of Examples. Therefore, it was confirmed that the stability over time was inferior.
It was confirmed that the oil-in-water emulsified cosmetic of Comparative Example 2 containing no trimethylglycine was strongly sticky after being applied to the skin, and the feeling of use was not good.
It was confirmed that the oil-in-water emulsified cosmetic of Comparative Example 3 containing no water-holding oil did not have a moist feeling remaining on the surface of the skin after being applied to the skin, and the feeling of use was not good.
It was confirmed that the oil-in-water emulsified cosmetic of Comparative Example 4 containing no thickening polysaccharide was inferior in stability over time as compared with the oil-in-water emulsified cosmetic of Examples.
It was confirmed that the oil-in-water emulsified cosmetic of Comparative Example 5 containing no acrylic polymer was inferior in stability over time as compared with the oil-in-water emulsified cosmetic of Examples.
The oil-in-water emulsified cosmetic of Comparative Example 6 in which the content of the surfactant exceeds 0.5% by mass with respect to the total mass of the oil-in-water emulsified cosmetic is strongly sticky after being applied to the skin and is used. It was confirmed that the feeling was not good.

Claims (10)

With the (PEG-240 / decyltetradeceth-20 / HDI) copolymer,
With trimethylglycine,
With stearyl glycyrrhetinate,
Water-holding oil and
With thickening polysaccharides,
Acrylic polymer and
water and,
Including and
Oil-in-water emulsified makeup that does not contain a surfactant or has a surfactant content in the range of more than 0% by mass and 0.5% by mass or less with respect to the total mass of the oil-in-water emulsified cosmetic. Fee. Water-holding oils include di-lauroyl glutamate (phytosteryl / octyldodecyl), di lauroyl glutamate (cholesteryl / octyldodecyl), dimerjilinoleate di (isostearyl / phytosteryl), dimergilinoleate di (phytosteryl / isostearyl / cetyl /). The oil-in-water emulsified cosmetic according to claim 1, which is at least one selected from the group consisting of stearyl / behenyl), dipentaerythrityl tripolyhydroxystearate, and tetra (hydroxystearic acid / isostearic acid) dipentaerythrityl. The oil-in-water emulsified cosmetic according to claim 1 or 2, wherein the thickening polysaccharide is at least one selected from the group consisting of gellan gum, carrageenan, alcathylan, xanthan gum, pullulan, and locust bean gum. Claims 1 to claim, wherein the acrylic polymer is at least one selected from the group consisting of a (acrylic acid / alkyl acrylate (C10-30)) copolymer, a carboxyvinyl polymer, and a (acryloyldimethyltaurine ammonium / VP) copolymer. Item 3. The oil-in-water emulsified cosmetic according to any one of Items 3. The oil-in-water emulsified cosmetic according to any one of claims 1 to 4, further comprising an ester oil. Claimed that the ester oil is at least one selected from the group consisting of triethylhexanoine, tri (caprylic acid / capric acid) glyceryl, isopropyl palmitate, isotridecyl isononanoate, cetyl ethylhexanoate, and octyldodecyl myristate. The oil-in-water emulsified cosmetic according to 5. The oil-in-water emulsified cosmetic according to any one of claims 1 to 6, further comprising a hydrocarbon oil. Claim 7 where the hydrocarbon oil is at least one selected from the group consisting of petrolatum, microcrystalline wax, hydrogenated polyisobutene, selecin, beeswax, candelilla wax, shea butter, jojoba seed oil, and hydroxystearic acid. The described oil-in-water emulsified cosmetic. The oil-in-water emulsified cosmetic according to claim 7 or 8, wherein the hydrocarbon oil is petrolatum. The oil-in-water emulsified cosmetic according to any one of claims 1 to 9, wherein the thickening polysaccharide is gellan gum.