CN114569482A

CN114569482A - Oil-in-water type emulsion cosmetic

Info

Publication number: CN114569482A
Application number: CN202111437840.0A
Authority: CN
Inventors: 相见牧子; 江越由起; 久保利昭
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2020-11-30
Filing date: 2021-11-29
Publication date: 2022-06-03
Also published as: JP2022086863A

Abstract

The invention provides an oil-in-water emulsion cosmetic containing stearyl glycyrrhetinate, which has excellent stability over time and good use feeling. The oil-in-water emulsion cosmetic comprises (PEG-240/decyltetradecylpolyether-20/HDI) copolymer, trimethylglycine, stearyl glycyrrhetinate, a water-holding oil agent, thickening polysaccharides, an acrylic polymer and water, and does not contain a surfactant, or the content of the surfactant is in the range of more than 0 mass% and 0.5 mass% or less relative to the total mass of the oil-in-water emulsion cosmetic.

Description

Oil-in-water type emulsion cosmetic

Technical Field

The present invention relates to an oil-in-water type emulsion cosmetic.

Background

Stearyl glycyrrhetinate is known to have an anti-inflammatory effect. In recent years, the addition of stearyl glycyrrhetinate to cosmetics has been advanced, in view of the anti-inflammatory effect of stearyl glycyrrhetinate.

For example, patent document 1 discloses a composition for external application to the skin, such as a cream containing D-panthenol and stearyl glycyrrhetinate.

Patent document 1: japanese patent laid-open publication No. 2019-19077

Disclosure of Invention

Since stearyl glycyrrhetinate is a component that is hardly soluble in an aqueous medium when it is a monomer, in order to blend stearyl glycyrrhetinate in an aqueous cosmetic such as a cosmetic water, it is necessary to solubilize stearyl glycyrrhetinate with a surfactant or to include stearyl glycyrrhetinate in emulsion particles by using a large amount of an oil agent and an emulsifier (for example, a surfactant and a phospholipid) to prepare an oil-in-water type emulsion cosmetic dispersed in an aqueous medium. For example, in the composition for external application to the skin described in patent document 1, a relatively large amount of an ionic surfactant is used. However, since the surfactant itself is sticky, a cosmetic containing a large amount of the surfactant tends to feel a strong sticky feeling after application to the skin, and it is difficult to say that the feeling in use is good. In addition to the inhibition of the sticky feeling after application to the skin, the aqueous cosmetic containing stearyl glycyrrhetinate is required to have a moisturizing feeling unique to the aqueous cosmetic.

The present inventors have made the following studies as an attempt to blend stearyl glycyrrhetinate in an aqueous cosmetic composition: an emulsion-type oil-in-water type cosmetic (so-called oil-in-water type emulsion cosmetic) in which stearyl glycyrrhetinate is contained in emulsion particles dispersed in an aqueous medium is prepared without using a large amount of a surfactant. However, the following was found: when the amount of the surfactant is reduced, it is difficult to stably maintain the emulsified state, and the stability of the oil-in-water type emulsion cosmetic over time is easily impaired.

An object of one embodiment of the present invention is to provide an oil-in-water emulsion cosmetic that contains stearyl glycyrrhetinate, has excellent stability over time, and gives a good feeling of use.

Specific methods for solving the above problems include the following embodiments.

[1] An oil-in-water type emulsion cosmetic comprising:

(PEG-240/decyltetradecylpolyether-20/HDI) copolymer;

trimethylglycine;

stearyl glycyrrhetinate;

water-holding oil solution;

thickening polysaccharides;

an acrylic polymer; and

the amount of water is controlled by the amount of water,

and does not contain a surfactant, or the content of the surfactant is in a 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 type emulsion cosmetic.

[2] The oil-in-water type emulsion cosmetic according to [1], wherein,

the water-holding oil agent is at least 1 selected from the group consisting of lauroyl glutamic acid di (phytosteryl/octyldodecyl) ester, lauroyl glutamic acid di (cholesterol/octyldodecyl) ester, dimerized dilinoleic acid di (isostearyl/phytosteryl) ester, dimerized dilinoleic acid di (phytosteryl/isostearyl/cetyl/stearyl/behenyl) ester, trimerized hydroxypentaerythritol hydroxystearate and tetrakis (hydroxystearate/isostearic acid) dipentaerythritol ester.

[3] The oil-in-water type emulsion cosmetic according to [1] or [2], wherein,

the thickening polysaccharides are at least 1 selected from the group consisting of gellan gum, carrageenan, Alcaligenes polysaccharide, xanthan gum, pullulan and locust bean gum.

[4] The oil-in-water type emulsion cosmetic according to any one of [1] to [3], wherein,

the acrylic polymer is at least 1 selected from the group consisting of (acrylic acid ester/alkyl (C10-30) acrylate) copolymer, carboxyvinyl polymer, and (ammonium acryloyldimethyltaurate/VP) copolymer.

[5] The oil-in-water type emulsion cosmetic according to any one of [1] to [4], further comprising an ester oil.

[6] The oil-in-water type emulsion cosmetic according to [5], wherein,

the ester oil is at least 1 selected from the group consisting of triglyceride (ethyl hexanoate), glyceryl tri (caprylic/capric acid), isopropyl palmitate, isotridecyl isononanoate, cetyl ethylhexanoate and octyldodecanol myristate.

[7] The oil-in-water type emulsion cosmetic according to any one of [1] to [6], which further comprises a hydrocarbon oil.

[8] The oil-in-water type emulsion cosmetic according to [7], wherein,

the hydrocarbon oil is at least 1 selected from the group consisting of vaseline, microcrystalline wax, hydrogenated polyisobutene, ozokerite, beeswax, candelilla wax, shea butter, jojoba seed oil and hydroxystearic acid.

[9] The oil-in-water type emulsion cosmetic according to [7] or [8], wherein,

the hydrocarbon oil is vaseline.

[10] The oil-in-water type emulsion cosmetic according to any one of [1] to [9], wherein,

the thickening polysaccharide is gellan gum.

Effects of the invention

According to one embodiment of the present invention, there is provided an oil-in-water emulsion cosmetic that contains stearyl glycyrrhetinate, has excellent stability over time, and has a good feeling of use.

Detailed Description

The oil-in-water emulsion cosmetic of the present invention will be described in detail below. The requirements described below may be explained based on a representative embodiment of the present invention, but the present invention is not limited to such an embodiment, and can be implemented with appropriate modifications within the scope of the object of the present invention.

In the present invention, the numerical range indicated by the term "to" refers to a range in which the numerical values before and after the term "to" are included as the minimum value and the maximum value, respectively.

In the numerical ranges recited in the present invention, the upper limit or the lower limit recited in a certain numerical range may be replaced with the upper limit or the lower limit recited in another numerical range recited in a stepwise manner. In addition, in the numerical ranges described in the present invention, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the values shown in the examples.

In the present invention, a combination of 2 or more preferred embodiments is a more preferred embodiment.

In the present invention, the amount of each component in the oil-in-water type emulsion cosmetic refers to the total amount of a plurality of substances present in the oil-in-water type emulsion cosmetic, unless otherwise specified, when a plurality of substances corresponding to each component are present in the oil-in-water type emulsion cosmetic.

In the present invention, the term "aqueous phase" is used as a word corresponding to the "oil phase" regardless of the kind of solvent.

In the present invention, "feeling of use" refers to a sticky feeling and a moisturizing feeling, and "oil-in-water emulsion cosmetic with good feeling of use" refers to an oil-in-water emulsion cosmetic that suppresses the sticky feeling after application to the skin and that provides a moisturizing feeling after application to the skin.

In the present invention, the "moisturizing feeling" refers to a moist touch feeling remaining on the skin surface.

[ oil-in-water type emulsion cosmetics ]

The oil-in-water emulsion cosmetic of the present invention contains a (PEG-240/decyltetradecyltetradecylpolyether-20/HDI) copolymer, trimethylglycine, stearyl glycyrrhetinate, a water-absorbing oil agent, a thickening polysaccharide, an acrylic polymer, and water, and contains no surfactant or a content of a surfactant in a range of more than 0 mass% and 0.5 mass% or less with respect to the total mass of the oil-in-water emulsion cosmetic.

Unlike conventional aqueous cosmetics containing stearyl glycyrrhetinate, the oil-in-water type emulsion cosmetic of the present invention is prepared by incorporating stearyl glycyrrhetinate into an aqueous cosmetic in an emulsion type of an oil-in-water type (so-called oil-in-water type emulsion cosmetic) in which stearyl glycyrrhetinate is dispersed in an aqueous medium in emulsion particles, without using a large amount of a surfactant.

In general, when the amount of the surfactant is reduced, it is difficult to stably maintain the emulsified state, and the stability of the oil-in-water type emulsion cosmetic over time is easily impaired. On the other hand, the oil-in-water type emulsion cosmetic of the present invention contains a (PEG-240/decyltetradecylpolyether-20/HDI) copolymer, a thickening polysaccharide and an acrylic polymer, and thus has excellent stability over time even when the amount of the surfactant is reduced.

Further, since the surfactant itself is sticky, when a cosmetic containing a large amount of the surfactant is applied to the skin, a strong sticky feeling tends to be felt. On the other hand, the oil-in-water type emulsion cosmetic of the present invention contains no surfactant or a small amount of surfactant, and thus can suppress the sticky feeling caused by the surfactant. Further, the oil-in-water type emulsion cosmetic of the present invention contains trimethylglycine, and therefore, can suppress the sticky feeling after application to the skin. Further, the oil-in-water type emulsion cosmetic of the present invention can obtain a good moisturizing feeling after application to the skin by containing the water-holding oil agent, and can further improve the moisturizing feeling by containing the (PEG-240/decyltetradecanolpolyether-20/HDI) copolymer in combination.

As described above, the oil-in-water type emulsion cosmetic of the present invention has a good feeling of use.

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

[ (PEG-240/decyltetradecylpolyether-20/HDI) copolymer ]

The oil-in-water type emulsion cosmetic of the present invention comprises (PEG-240/decyltetradecylpolyether-20/HDI) copolymer.

In the oil-in-water type emulsion cosmetic of the present invention, the (PEG-240/decyltetradecylpolyether-20/HDI) copolymer contributes to the improvement of the secular stability of the oil-in-water type emulsion cosmetic.

Further, in the oil-in-water type emulsion cosmetic of the present invention, the (PEG-240/decyltetradecylpolyether-20/HDI) copolymer contributes to the improvement of moisturizing feeling.

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

"(PEG-240/decyltetradecylpolyether-20/HDI) copolymer" is a name showing the ingredients of the cosmetic. (PEG-240/decyltetradecylpolyether-20/HDI) COPOLYMER in the INCI (International Nomenclature for Cosmetic ingredients) name, PEG-240/HDI COPOLYMER BIS-DECYLTETRADECETH-20 ETHER. In addition, the term "(PEG-240/decyltetradecylpolyether-20/HDI) copolymer refers to a polyethylene glycol-decyltetradecylpolyether-20-hexamethylene diisocyanate co-polymer in the names of the components of the irregular pharmaceutical product.

(PEG-240/decyltetradecylpolyether-20/HDI) copolymer is commercially available as "thickener (ADEKA NOL) (registered trademark) GT-700" from ADEKA CORPORATION.

The content of the (PEG-240/decyltetradecylpolyether-20/HDI) copolymer in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and is preferably 0.5 to 3% by mass, for example, based on the total mass of the oil-in-water emulsion cosmetic.

When the content of the (PEG-240/decyltetradecyltetradecylpolyether-20/HDI) copolymer in the oil-in-water emulsion cosmetic of the present invention is 0.5% by mass or more based on the total mass of the oil-in-water emulsion cosmetic, the stability of the oil-in-water emulsion cosmetic over time tends to be further improved. Further, when the content of the (PEG-240/decyltetradecyltetradecylpolyether-20/HDI) copolymer in the oil-in-water emulsion cosmetic of the present invention is 0.5% by mass or more based on the total mass of the oil-in-water emulsion cosmetic, a more favorable moisturizing feeling tends to be obtained after application to the skin.

From this viewpoint, the content of the (PEG-240/decyltetradecyltetradecylpolyether-20/HDI) copolymer in the oil-in-water emulsion cosmetic of the present invention is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, and still more preferably 1% by mass or more, based on the total mass of the oil-in-water emulsion cosmetic.

When the content of the (PEG-240/decyltetradecylpolyether-20/HDI) copolymer in the oil-in-water emulsion cosmetic of the present invention is 3% by mass or less based on the total mass of the oil-in-water emulsion cosmetic, the sticky feeling after application to the skin tends to be further suppressed.

From such a viewpoint, the content of the (PEG-240/decyltetradecyltetradecylpolyether-20/HDI) copolymer in the oil-in-water emulsion cosmetic of the present invention is preferably 3% by mass or less, more preferably 2% by mass or less, and still more preferably 1.5% by mass or less, based on the total mass of the oil-in-water emulsion cosmetic.

[ trimethylglycine ]

The oil-in-water type emulsion cosmetic of the present invention contains trimethylglycine.

In the oil-in-water type emulsion cosmetic of the present invention, trimethylglycine contributes to the inhibition of the sticky feeling.

Trimethylglycine is a compound having the structure shown below.

Trimethylglycine is sometimes referred to as glycine betaine, anhydrous betaine or simply betaine and further, the cosmetic ingredient of trimethylglycine is shown under the name betaine.

[ chemical formula 1]

Trimethylglycine is an organic compound present in the body of an organism.

Trimethylglycine can be obtained, for example, by extraction and purification from beet molasses.

Trimethylglycine can be obtained as a commercially available product.

Examples of commercially available trimethylglycine include AMICOAT (trade name) manufactured by Asahi Kasei Chemicals Corporation, and BetafinBP (trade name) manufactured by EBISU KAGAKU & co.

The content of trimethylglycine in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and is preferably 0.1 to 10% by mass, for example, based on the total mass of the oil-in-water emulsion cosmetic.

When the content of trimethylglycine in the oil-in-water type emulsion cosmetic of the present invention is 0.1% by mass or more based on the total mass of the oil-in-water type emulsion cosmetic, the sticky feeling after application to the skin tends to be further suppressed.

From such a viewpoint, the content of trimethylglycine in the oil-in-water emulsion cosmetic of the present invention is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and still more preferably 1% by mass or more, based on the total mass of the oil-in-water emulsion cosmetic.

When the content of trimethylglycine in the oil-in-water emulsion cosmetic of the present invention is too high, the properties of the oil-in-water emulsion cosmetic tend to become hard. When the content of trimethylglycine in the oil-in-water emulsion cosmetic of the present invention is 10% by mass or less based on the total mass of the oil-in-water emulsion cosmetic, the formulation of the oil-in-water emulsion cosmetic tends to be easily made into a colloid (also referred to as "gel" or less).

From such a viewpoint, the content of trimethylglycine in the oil-in-water emulsion cosmetic of the present invention is preferably 10% by mass or less, more preferably 8% by mass or less, and still more preferably 5% by mass or less, based on the total mass of the oil-in-water emulsion cosmetic.

[ stearyl glycyrrhetinate ]

The oil-in-water type emulsion cosmetic of the present invention comprises stearyl glycyrrhetinate.

Stearyl glycyrrhetinate is a substance that improves solubility in oils and fats by causing glycyrrhizic acid and stearyl alcohol to undergo an ester bond, and is widely used as a component having an anti-inflammatory effect in the field of cosmetics [ i.e., cosmetics and informal drugs (e.g., cosmeceuticals) ].

Commercially available stearyl glycyrrhetate can be used.

Examples of commercially available stearyl glycyrrhetinate include MARUZEN PHARMACE uticols co., SEA augertinol (trade name) manufactured by ltd., and stearyl glycyrrhetinate (trade name) manufactured by Alps Pharmaceutical ind.

The content of stearyl glycyrrhetate in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and is preferably 0.01 to 3% by mass, for example, based on the total mass of the oil-in-water emulsion cosmetic.

When the content of stearyl glycyrrhetinate in the oil-in-water emulsion cosmetic of the present invention is 0.01% by mass or more based on the total mass of the oil-in-water emulsion cosmetic, the anti-inflammatory effect based on stearyl glycyrrhetinate tends to be more favorably enjoyed.

From such a viewpoint, the content of stearyl glycyrrhetinate in the oil-in-water emulsion cosmetic of the present invention is preferably 0.01% by mass or more, more preferably 0.03% by mass or more, and still more preferably 0.05% by mass or more, based on the total mass of the oil-in-water emulsion cosmetic.

When the content of stearyl glycyrrhetinate in the oil-in-water emulsion cosmetic of the present invention is 3% by mass or less based on the total mass of the oil-in-water emulsion cosmetic, the precipitation of stearyl glycyrrhetinate which can occur when the oil-in-water emulsion cosmetic is left in a low-temperature environment tends to be further suppressed.

From such a viewpoint, the content of stearyl glycyrrhetinate in the oil-in-water emulsion cosmetic of the present invention is preferably 3% by mass or less, more preferably 2% by mass or less, and even more preferably 1% by mass or less, based on the total mass of the oil-in-water emulsion cosmetic.

[ Water-holding oil agent ]

The oil-in-water type emulsion cosmetic of the present invention contains a water-holding oil agent.

In the oil-in-water type emulsion cosmetic of the present invention, the water-holding oil agent contributes to an improvement in the moisturizing feeling.

The water-holding oil agent is not particularly limited as long as it is an oil agent capable of holding water by itself, and the water-holding power measured in the water-holding test described below is preferably 100% or more. The oil agent having a water holding capacity of 100% or more means an oil agent capable of holding water in an amount equal to or more than its own weight.

Water holding test-

10g of an oil agent heated to 50 ℃ was weighed into a glass container and stirred. Water at 50 ℃ was slowly added to the oil while stirring until the water was drained from the oil, and then left at room temperature (25 ℃) for 24 hours. After standing, the separated water was removed, and the amount (unit: g) of water held by the oil agent was measured. The measured amount of water was divided by the amount of the oil agent (i.e., 10g), and multiplied by 100 times as the holding power (unit:%).

Specific examples of the water-holding oil agent include di (phytosterol/octyldodecyl) lauroyl glutamate, di (cholesterol/octyldodecyl) lauroyl glutamate, di (isostearyl/phytosterol) dilinoleate, di (phytosterol/isostearyl/cetyl/stearyl/behenyl) dilinoleate, dipentaerythritol trimerized hydroxystearate, di (hydroxystearic acid/isostearic acid) dipentaerythritol, di (cholesterol/behenyl/octyldodecyl) lauroyl glutamate, di (octyldodecyl/phytosterol/behenyl) lauroyl glutamate, tetradecylmethyl (Myristoyl Methyl) -beta-alanine (phytosterol/decyltetradecyl) ester, di (Myristoyl Methyl) -beta-alanine, di (cholesteryl/decyltetradecyl) ester, and mixtures thereof, Cholesterol hydroxystearate, phytosterol oleate, phytosterol sunflower seed ester, lanolin wax, phytosterol isostearate, dipentadiene fatty acid ester (1), dipentadiene fatty acid ester (2), dipentadiene hexaoxystearate, and glyceryl (ethylhexanoate/stearate/adipate). The water-holding capacity of the water-holding oil agent mentioned as a specific example is 100% or more in the water-holding capacity test.

Among these, the water-holding oil agent is preferably at least 1 selected from the group consisting of di (phytosterol/octyldodecyl) lauroyl glutamate, di (cholesterol/octyldodecyl) lauroyl glutamate, di (isostearyl/phytosterol) dimer dilinoleate, di (phytosterol/isostearyl/cetyl/stearyl/behenyl) dimer dilinoleate, dipentaerythritol trimer hydroxystearate, and dipentaerythritol tetrakis (hydroxystearate/isostearate) from the viewpoint of market performance and market availability, and is more preferably di (phytosterol/octyldodecyl) lauroyl glutamate.

As the water-holding oil agent, a commercially available product can be used.

Examples of commercially available products of the water-holding oil agent include AJINOMOTO co, Erdu (registered trademark) PS-203, Erdu (registered trademark) CL-202, Erdu (registered trademark) APS-307, Erdu (registered trademark) CL-391, Erdu (registered trademark) PC-304, luplan (registered trademark) PI-DA, plandol (registered trademark) -S, Plandool (registered trademark) -H, Plandool (registered trademark) -SUN, and plandolol (registered trademark) -ISS, and Nisshin oio Group, Saracos (registered trademark) WO-6, COSMOL (registered trademark) 168, Saracos (registered trademark) HS, Saracos (registered trademark) FH, Saracos (registered trademark) po, cosol (registered trademark) 168, saracol (registered trademark) AR 168, and mcom (registered trademark) h.

The oil-in-water type emulsion cosmetic of the present invention may contain only 1 water-holding oil agent, or may contain 2 or more oil agents.

The content of the water-holding oil agent in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and is preferably 0.1 to 10% by mass, for example, based on the total mass of the oil-in-water emulsion cosmetic.

When the content of the water-holding oil agent in the oil-in-water emulsion cosmetic of the present invention is 0.1% by mass or more based on the total mass of the oil-in-water emulsion cosmetic, a more satisfactory moisturizing feeling tends to be obtained after application to the skin.

From such a viewpoint, the content of the water-holding oil agent in the oil-in-water type emulsion cosmetic of the present invention is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, further preferably 0.5% by mass or more, and particularly preferably 1% by mass or more, based on the total mass of the oil-in-water type emulsion cosmetic.

Further, when the content of the water-holding oil agent in the oil-in-water type emulsion cosmetic of the present invention is 10% by mass or less based on the total mass of the oil-in-water type emulsion cosmetic, the sticky feeling after application to the skin tends to be further suppressed.

From such a viewpoint, the content of the water-holding oil agent in the oil-in-water type emulsion cosmetic of the present invention is preferably 10% by mass or less, more preferably 8% by mass or less, further preferably 5% by mass or less, and particularly preferably 3% by mass or less, based on the total mass of the oil-in-water type emulsion cosmetic.

[ thickening polysaccharides ]

The oil-in-water type emulsion cosmetic of the present invention contains thickening polysaccharides.

In the oil-in-water type emulsion cosmetic of the present invention, the thickening polysaccharide contributes to improvement of the temporal stability of the oil-in-water type emulsion cosmetic.

The thickening polysaccharide is not particularly limited.

The thickening polysaccharides include polysaccharides and derivatives thereof.

The thickening polysaccharides may be polysaccharides derived from natural products or derivatives thereof, or polysaccharides obtained by chemical synthesis or derivatives thereof. Here, natural products include animals, plants, and microorganisms.

Examples of polysaccharide derivatives used as thickening polysaccharides include derivatives in which a part of the saccharides in the polysaccharides is bonded to an alkyl group, a polyethylene oxide group, a polypropylene oxide group, or the like; and derivatives bonded to a monomer such as glucose, lactose or sucrose or a polymer having these sugars as a constituent unit.

Specific examples of the thickening polysaccharides include gellan gum, carrageenan, an alcaligenes polysaccharide, xanthan gum, pullulan, locust bean gum, hydroxypropyl xanthan gum, guar gum, hydroxypropyl guar gum, Na acrylate-grafted starch, gum arabic, karaya gum, tamarind gum, and hydroxyethyl cellulose.

Among these, as the thickening polysaccharides, for example, at least 1 selected from the group consisting of gellan gum, carrageenan, alcaligenes polysaccharide, xanthan gum, pullulan, locust bean gum, hydroxypropyl xanthan gum, guar gum, hydroxypropyl guar gum and Na acrylate-grafted starch is preferable from the viewpoint of ease of application to oil-in-water emulsion cosmetics of various dosage forms.

The thickening polysaccharide is preferably at least 1 selected from the group consisting of gellan gum, carrageenan, alcaligenes polysaccharide, xanthan gum, pullulan, and locust bean gum, more preferably at least 1 selected from gellan gum and alcaligenes polysaccharide, and still more preferably gellan gum, from the viewpoint of the stability with time and the feeling of use of the oil-in-water emulsion cosmetic.

The oil-in-water type emulsion cosmetic of the present invention may contain only 1 thickening polysaccharide, or may contain 2 or more thickening polysaccharides.

The content of the thickening polysaccharide in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and is preferably 0.05 to 3% by mass, for example, based on the total mass of the oil-in-water emulsion cosmetic.

When the content of the thickening polysaccharide in the oil-in-water emulsion cosmetic of the present invention is 0.05% by mass or more based on the total mass of the oil-in-water emulsion cosmetic, the stability of the oil-in-water emulsion cosmetic over time tends to be further improved.

From such a viewpoint, the content of the thickening polysaccharide in the oil-in-water type emulsion cosmetic of the present invention is preferably 0.05% by mass or more, more preferably 0.08% by mass or more, and still more preferably 0.1% by mass or more, based on the total mass of the oil-in-water type emulsion cosmetic.

When the content of the thickening polysaccharide in the oil-in-water emulsion cosmetic of the present invention is 3% by mass or less based on the total mass of the oil-in-water emulsion cosmetic, the sticky feeling after application to the skin tends to be further suppressed.

From such a viewpoint, the upper limit of the content of the thickening polysaccharide in the oil-in-water type emulsion cosmetic of the present invention is preferably 3% by mass or less, more preferably 2% by mass or less, further preferably 1% by mass or less, and particularly preferably 0.8% by mass or less, based on the total mass of the oil-in-water type emulsion cosmetic.

[ acrylic Polymer ]

The oil-in-water type emulsion cosmetic of the present invention contains an acrylic polymer.

In the oil-in-water type emulsion cosmetic of the present invention, the acrylic polymer contributes to improvement of the stability of the oil-in-water type emulsion cosmetic with time.

In the present invention, the "acrylic polymer" refers to a polymer containing a structural unit derived from a monomer having a (meth) acryloyl group. In the present invention, "(meth) acryloyl" is a term including both "acryloyl" and "methacryloyl".

The weight average molecular weight of the acrylic polymer is not particularly limited, and is, for example, preferably 5,000 to 20,000,000, more preferably 10,000 to 10,000,000.

The weight average molecular weight of the acrylic polymer was measured by a Gel Permeation Chromatography (GPC) method using polystyrene as a standard substance.

Specific examples of the acrylic polymer include (acrylic acid ester/alkyl (C10-30) acrylate) copolymer, carboxyvinyl polymer, (Na acrylate/Na acryloyldimethyltaurate) copolymer, (ammonium acryloyldimethyltaurate/VP) copolymer, (ammonium acryloyldimethyltaurate/carboxyethylammonium acrylate) crosslinked polymer, and (ammonium acryloyldimethyltaurate/behenic acid methacrylate-25) crosslinked polymer.

Among these, as the acrylic polymer, for example, from the viewpoint of ease of application to oil-in-water emulsion cosmetics of various dosage forms, at least 1 selected from the group consisting of (acrylic acid ester/alkyl (C10-30) acrylate) copolymer, carboxyvinyl polymer, (Na acrylate/Na acryloyldimethyltaurate) copolymer, (ammonium acryloyldimethyltaurate/VP) copolymer, and (ammonium acryloyldimethyltaurate/carboxyethylammonium acrylate) crosslinked polymer is preferable.

Further, as the acrylic polymer, for example, from the viewpoint of obtaining a more favorable moisturizing feeling after application to the skin, at least 1 selected from the group consisting of an (acrylic acid ester/alkyl (C10-30) acrylate) copolymer, a carboxyvinyl polymer, and an (ammonium acryloyldimethyltaurate/VP) copolymer is preferable.

"VP" is an abbreviation for vinylpyrrolidone.

As the acrylic polymer, commercially available products 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) Ultrez 21 Polymer, Carbopol (registered trademark) Ultrez 10, Carbopol (registered trademark) ETD 2020 Polymer, Carbopol (registered trademark) ETD 2050 Polymer, Carbopol (registered trademark) 1382 Polymer, Aristoflex (registered trademark) AVC, Aristoflex (registered trademark) HMB and Aristoflex (registered trademark) TAC, manufactured by Clarian Japan K.K., and SIMULGEL (registered trademark) EG, manufactured by SEPPIC S.A.

The oil-in-water type emulsion cosmetic of the present invention may contain only 1 kind of acrylic polymer, or may contain 2 or more kinds.

The content of the acrylic polymer in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and is preferably 0.05 to 3% by mass, for example, based on the total mass of the oil-in-water emulsion cosmetic.

When the content of the acrylic polymer in the oil-in-water type emulsion cosmetic of the present invention is 0.05% by mass or more based on the total mass of the oil-in-water type emulsion cosmetic, the stability of the oil-in-water type emulsion cosmetic over time tends to be further improved.

From such a viewpoint, the content of the acrylic polymer in the oil-in-water type emulsion cosmetic of the present invention is preferably 0.05% by mass or more, more preferably 0.08% by mass or more, and still more preferably 0.1% by mass or more, based on the total mass of the oil-in-water type emulsion cosmetic.

When the content of the acrylic polymer in the oil-in-water type emulsion cosmetic of the present invention is 3% by mass or less based on the total mass of the oil-in-water type emulsion cosmetic, the sticky feeling after application to the skin tends to be further suppressed.

From such a viewpoint, the upper limit of the content of the acrylic polymer in the oil-in-water type emulsion cosmetic of the present invention is preferably 3% by mass or less, more preferably 2% by mass or less, and still more preferably 1% by mass or less, based on the total mass of the oil-in-water type emulsion cosmetic.

[ Water ]

The oil-in-water type emulsion cosmetic of the present invention contains 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, purified water, and ultrapure water [ for example, Milli-Q (registered trademark) water ].

Among these, as water, pure water, distilled water, ion-exchanged water, pure water, or ultrapure water is preferable from the viewpoint of less impurities.

The content of water in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and is, for example, preferably 50 to 99% by mass, more preferably 60 to 97% by mass, and still more preferably 70 to 95% by mass, based on the total mass of the oil-in-water emulsion cosmetic.

[ surfactant ]

The oil-in-water type emulsion cosmetic of the present invention contains no surfactant, or the content of the surfactant is in the range of more than 0% by mass and 0.5% by mass or less relative to the total mass of the oil-in-water type emulsion cosmetic, the content of the surfactant is preferably in a range of more than 0% by mass and 0.3% by mass or less with respect to the total mass of the oil-in-water type emulsion cosmetic, more preferably in a 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 type emulsion cosmetic, even more preferably in a range of not containing the surfactant, or in a 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 type emulsion cosmetic, and particularly preferably in a range of not containing the surfactant.

When the oil-in-water type emulsion cosmetic of the present invention contains no surfactant or the content of the surfactant is in the range of more than 0% by mass and 0.5% by mass or less based on the total mass of the oil-in-water type emulsion cosmetic, the sticky feeling after application to the skin tends to be suppressed.

Further, if the oil-in-water type emulsion cosmetic of the present invention does not contain a surfactant, or if the content of the surfactant is in the range of more than 0% by mass and 0.5% by mass or less relative to the total mass of the oil-in-water type emulsion cosmetic, irritation of the skin by the surfactant does not occur, or irritation of the skin by the surfactant is difficult to occur.

The surfactant is not particularly limited.

Examples of the surfactant include those commonly used as a component of a surfactant in the field of cosmetics [ i.e., cosmetics and non-normal drugs (e.g., cosmeceuticals) ].

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 have the potential to cause irritation to the skin.

The oil-in-water type emulsion cosmetic of the present invention does not contain a surfactant, or the content of the surfactant is 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 type emulsion cosmetic, and therefore, even if the surfactant is at least 1 ionic surfactant selected from the group consisting of an anionic surfactant, a cationic surfactant and an amphoteric surfactant, no irritation of the skin by the surfactant or irritation of the skin by the surfactant is generated.

[ ester oil ]

The oil-in-water type emulsion cosmetic of the present invention preferably further contains an ester oil.

In the oil-in-water type emulsion cosmetic of the present invention, the ester oil contributes to improvement of the applicability of the oil-in-water type emulsion cosmetic in production.

The ester oil is not particularly limited, and is preferably a low-viscosity ester oil, for example, from the viewpoint of further improving the applicability to the production of oil-in-water emulsion cosmetics.

In the present invention, the "low-viscosity ester oil" refers to an ester oil having a viscosity of 100mPa · s or less at 25 ℃. The viscosity of the ester oil was measured by a B-type viscometer.

Specific examples of the ester oil include glycerol tri (ethylhexanoate), glycerol tri (octanoate/decanoate), isopropyl palmitate, isotridecyl isononanoate, cetyl ethylhexanoate, octyldodecanol myristate, isopropyl myristate, isocetyl myristate, ethylhexyl palmitate, hexyl ethylhexanoate, hexyl decanoate ethylhexanoate, isostearyl neopentanoate, octyl dodecyl neopentanoate, isotridecyl isononanoate, isopropyl isostearate, isopropyl palmitate, isononyl isononanoate, isodecyl neopentanoate, neopentyl glycol dicaprate, neopentyl glycol diethylhexanoate, PG dicaprate, PG dicaprylate, trimethylolpropane triethylhexanoate, pentaerythritol tetraethylhexanoate, and hexyl decanoate isostearate. In addition, the above "PG" is an abbreviation for propylene glycol. Specific examples thereof include ester oils having a low viscosity.

Among these, as the ester oil, for example, from the viewpoint of the feeling of use and the market performance, at least 1 selected from the group consisting of triglyceride (ethyl hexanoate), triglyceride (caprylic/capric acid), isopropyl palmitate, isotridecyl isononanoate, cetyl ethylhexanoate, and octyldodecanol myristate is preferable.

When the oil-in-water type emulsion cosmetic of the present invention contains an ester oil, it may contain only 1 ester oil, or may contain 2 or more ester oils.

The content of the ester oil in the oil-in-water emulsion cosmetic of the present invention is not particularly limited.

When the oil-in-water type emulsion cosmetic of the present invention contains an ester oil, the content of the ester oil is preferably 0.1 to 15% by mass, more preferably 0.2 to 10% by mass, and still more preferably 0.5 to 5% by mass, based on the total mass of the oil-in-water type emulsion cosmetic.

[ hydrocarbon oil ]

The oil-in-water type emulsion cosmetic of the present invention preferably further contains a hydrocarbon oil.

In the oil-in-water type emulsion cosmetic of the present invention, the hydrocarbon oil contributes to an improvement in moisturizing feeling.

Specific examples of hydrocarbon oils include vaseline, microcrystalline wax, hydrogenated polyisobutene, ozokerite, beeswax, candelilla wax, shea butter, jojoba seed oil, hydroxystearic acid, squalane and paraffin wax.

Among these, as the hydrocarbon oil, for example, at least 1 selected from the group consisting of vaseline, microcrystalline wax, hydrogenated polyisobutene, ozokerite, beeswax, candelilla wax, shea butter, jojoba seed oil and hydroxystearic acid is preferable from the viewpoint of improving the moisturizing feeling, and vaseline is more preferable.

When the oil-in-water type emulsion cosmetic of the present invention contains hydrocarbon oil, it may contain only 1 kind of hydrocarbon oil, or may contain 2 or more kinds.

The content of the hydrocarbon oil in the oil-in-water emulsion cosmetic of the present invention is not particularly limited.

When the oil-in-water type emulsion cosmetic of the present invention contains a hydrocarbon oil, the content of the hydrocarbon oil is preferably 0.1 to 15% by mass, more preferably 0.2 to 10% by mass, and still more preferably 0.5 to 5% by mass, based on the total mass of the oil-in-water type emulsion cosmetic.

(other Components)

The oil-in-water type emulsion cosmetic of the present invention may contain, as necessary, components other than the above-described components (so-called other components) within a range not impairing the effects of the present invention.

Examples of the other components include additional components (hereinafter, also simply referred to as "additional components") that are generally used in cosmetics.

< ingredients added >

The oil-in-water type emulsion cosmetic of the present invention may contain an additional ingredient.

Examples of the additive component include functional components that exhibit a useful cosmetic effect (moisturizing effect, whitening effect, skin care effect, and the like) when used in cosmetics (so-called cosmetics and cosmeceuticals).

Examples of such functional components include ascorbic acid derivatives such as L-ascorbic acid and palmatine; carotene such as beta-carotene, astaxanthin, zeaxanthin, lycopene, lutein, etc.; vitamin E such as tocopherol and tocotrienol; retinol derivatives such as retinyl palmatine; ubiquinone such as coenzyme Q10; polyhydric alcohols such as glycerin, 1, 3-butylene glycol (component of cosmetics is named BG), and dipropylene glycol (DPG); polysaccharides such as hyaluronic acid, erythritol, xylitol, glucose, sorbitol, and trehalose; glycosphingolipids such as glucosylceramide and galactosylceramide; hydrolyzed collagen, water-soluble collagen and other collagens; amino acids such as acetylhydroxyproline; hydrolyzing lupin protein; nicotinamide; polyethylene glycol; uncaria GAMBIR (Uncaria GAMBIR) extract; extract of rhizoma Belamcandae (Belamcanda CHINENSIS) root; dipotassium glycyrrhizinate and the like.

Examples of the additive components other than those described above include antioxidants, silicone oils (cyclopentasiloxane, polydimethylsiloxane, etc.), buffers (citric acid, phosphoric acid, etc.), pH adjusters (sodium hydroxide, potassium hydroxide, hydrochloric acid, etc.), preservatives (phenoxyethanol, ethylhexylglycerin, etc.), ultraviolet absorbers, anti-inflammatory agents, colorants, fragrances, and the like.

Of these additional components, 1 component may also serve more than 2 functions.

When gellan gum is contained as a thickening polysaccharide, the oil-in-water emulsion cosmetic of the present invention preferably contains a salt such as sodium chloride, potassium chloride, or calcium chloride as an additive component. When the formulation of the oil-in-water type emulsion cosmetic is made into a colloid by using gellan gum and salt in combination, the strength of the colloid can be further improved.

When the oil-in-water type emulsion cosmetic of the present invention contains other components, it may contain only 1 kind of other components, or may contain 2 or more kinds.

When the oil-in-water type emulsion cosmetic of the present invention 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 diameter of the emulsified particles in the oil-in-water type emulsion cosmetic of the present invention is not particularly limited, and is, for example, preferably 15 μm or less, more preferably 10 μm or less, and still more preferably 6 μm or less.

The lower limit of the average particle size of the emulsified particles in the oil-in-water type emulsion cosmetic of the present invention is not particularly limited, and is preferably 1 μm or more, for example.

In the present invention, the "average particle diameter" of the emulsified particles means a volume average particle diameter.

The average particle size of the emulsified particles was measured by a dynamic light scattering method using a particle size distribution meter after diluting the oil-in-water type emulsified cosmetic 10 times with ultrapure water.

As the particle size distribution meter, for example, NANOTR ACUPA (trade name) manufactured by microtrac bell corp. However, the particle size distribution meter is not limited thereto.

[ use of oil-in-water emulsion cosmetic ]

The oil-in-water type emulsion cosmetic of the present invention can be preferably used as a cosmetic or a non-regular drug (so-called cosmeceutical).

[ formulation of oil-in-water emulsion cosmetic ]

The formulation of the oil-in-water emulsion cosmetic of the present invention is not particularly limited.

Examples of the formulation of the oil-in-water emulsion cosmetic of the present invention include a liquid, a colloid, an emulsion, and a cream.

[ method for producing oil-in-water emulsion cosmetic ]

The method for producing the oil-in-water type emulsion cosmetic of the present invention is not particularly limited.

The oil-in-water type emulsion cosmetic of the present invention is produced by a known method for producing an oil-in-water type emulsion cosmetic using a (PEG-240/decyltetradecylpolyether-20/HDI) copolymer, trimethylglycine, stearyl glycyrrhetinate, a water-binding oil agent, a thickening polysaccharide, an acrylic polymer, water, and, if necessary, an ester oil, a hydrocarbon oil, and the above-mentioned additional components.

A preferable production method of the oil-in-water type emulsion cosmetic of the present invention is, for example, the following method: an aqueous phase composition containing at least a (PEG-240/decyltetradecylpolyether-20/HDI) copolymer, trimethylglycine, thickening polysaccharides, an acrylic polymer and water, and an oil phase composition containing at least stearyl glycyrrhetinate and a water-holding oil agent were mixed and emulsified and dispersed.

The aqueous phase composition can be prepared, for example, by mixing: (PEG-240/decyltetradecylpolyether-20/HDI) copolymer, trimethylglycine, thickening polysaccharides, acrylic polymers, water, and optionally, an aqueous additive component.

In the preparation of the aqueous phase composition, all the components to be blended in the aqueous phase composition may be mixed at once, or the components to be blended in the aqueous phase composition may be mixed in portions.

The ingredients to be blended in the aqueous phase composition may be simply mixed in the aqueous phase composition, but preferably uniformly mixed.

The mixing method is not particularly limited.

Examples of the mixing method include a method of mixing by stirring.

For the stirring, a general stirrer or a stirring device can be used.

The stirring temperature is not particularly limited, and is preferably set to 100 ℃ or less, more preferably 60 to 90 ℃, for example, from the viewpoint of preventing bumping.

The method for adjusting the temperature is not particularly limited.

As a method of 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 the stirrer or the stirring device, the composition of the aqueous phase composition, and the like.

As an example of a preferable mode of the stirring temperature and the stirring time, a mode in which the stirring temperature is 80 ℃ and the stirring time is 1 hour may be cited.

The oil phase composition can be prepared, for example, by mixing: stearyl glycyrrhetinate, a water-holding oil agent, and oily additives (e.g., ester oil and hydrocarbon oil) among additives blended as desired.

In the preparation of the oil phase composition, all the components to be blended in the oil phase composition may be mixed at once, or each component to be blended 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 it is preferable to uniformly mix them.

The mixing method is not particularly limited.

Examples of the mixing method include a method of mixing by stirring.

For the stirring, a general stirrer or a stirring device can be used.

The stirring temperature is not particularly limited, and is preferably set to, for example, 60 to 90 ℃.

The method for adjusting the temperature is not particularly limited.

The stirring time is not particularly limited, and can be appropriately set according to the type of the stirrer or the stirring device, the composition of the oil phase composition, and the like.

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 be emulsified and dispersed, and preferably, the aqueous phase composition is stirred and mixed while adding the oil phase composition little by little to the stirred aqueous phase composition to be emulsified and dispersed.

In the emulsification dispersion, for example, a common emulsification method using a shearing action such as a stirrer, an impeller, a homomixer, or a continuous flow type shearing apparatus can be used.

The emulsion can be dispersed several times for the purpose of further uniformizing the particle size.

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

Examples

Hereinafter, the oil-in-water type emulsion cosmetic of the present invention will be described more specifically with reference to examples. However, the oil-in-water type emulsion cosmetic of the present invention is not limited to the following examples as long as it does not depart from the gist thereof.

[ production of oil-in-Water emulsion cosmetic ]

[ example 1]

Of the components described in table 1 below, (PEG-240/decyltetradecyltetradecylpolyether-20/HDI) copolymer, trimethylglycine, gellan gum, which is a thickening polysaccharide, an acrylic acid polymer (acrylic acid ester/alkyl acrylate (C10-30)) copolymer, water, and other aqueous additive components were put in a vessel, and stirred with a stirrer in a water bath at 80 ℃ for 1 hour, thereby obtaining an aqueous composition.

Next, of the components described in table 1 below, stearyl glycyrrhetinate, di (phytosterol/octyldodecyl) lauroyl glutamate as a water-holding oil agent, tri (ethylhexanoic acid) ester as an ester oil, vaseline as a hydrocarbon oil, and other oily additives were put into a container and stirred for 1 hour in a water bath at 80 ℃.

Next, using a vacuum emulsification stirring apparatus [ model: PVQ-3/7UN, mizu hardness co., ltd. manufactured), the aqueous phase composition was stirred, and the oil phase composition was added little by little to the stirred aqueous phase composition and mixed, thereby obtaining the oil-in-water type emulsion cosmetic of example 1.

[ example 2 to example 8]

Except that the composition of the oil-in-water type emulsion cosmetic in example 1 was changed to the composition shown in table 1, the same procedures as in example 1 were carried out to obtain each of the oil-in-water type emulsion cosmetics of examples 2 to 8.

[ example 9 to example 22 ]

Except that the composition of the oil-in-water type emulsion cosmetic in example 1 was changed to the composition shown in table 2, the same procedures as in example 1 were carried out to obtain each of the oil-in-water type emulsion cosmetics of examples 9 to 22.

[ comparative examples 1 to 6]

Except that the composition of the oil-in-water emulsion cosmetic in example 1 was changed to the composition shown in table 3, the same procedure as in example 1 was carried out to obtain each of the oil-in-water emulsion cosmetics of comparative examples 1 to 6.

[ measurement of average particle diameter ]

The average particle size of the emulsified particles in each of the oil-in-water type emulsion cosmetics of examples l to 22 was measured by the method shown below.

The oil-in-water type emulsion cosmetic just prepared (within 24 hours from the preparation) was diluted 20 times with the distilled water. Next, the average particle diameter (volume average particle diameter) of the emulsified particles in the diluted oil-in-water type emulsified cosmetic was measured by a particle size distribution measuring apparatus of the laser diffraction/scattering type [ model: LA-960, HORIBA, Ltd.), and the particle size distribution was measured. As a result, the average particle size of the emulsified particles in each of the oil-in-water type emulsion cosmetics of examples 1 to 22 was within a range of 2 μm to 6 μm.

[ evaluation ]

The oil-in-water emulsion cosmetics of examples 1 to 22 and comparative examples 1 to 6 were evaluated as follows. The results are shown in tables 1 to 3.

1. Stability over time

The stability of the oil-in-water emulsion cosmetic over time was evaluated using, as an index, the change in viscosity and the change in appearance (more specifically, separation) of the oil-in-water emulsion cosmetic.

First, the viscosity (unit: mPas; the same below) at 25 ℃ of the oil-in-water type emulsion cosmetic prepared the next day was measured. The viscosity obtained here was set as "initial viscosity".

In addition, the measurement of the viscosity was carried out under the following conditions: as a measurement apparatus, a B-type viscometer [ trade name: TVB-10M viscometer, TOKI SANGYO co, ltd, system ], using a rotor: no.4, and rotation speed: 6rpm (revolutions per minute).

Then, 70g of the freshly prepared oil-in-water type emulsion cosmetic was weighed out, and the resulting mixture was put into a glass bottle and sealed to prepare a sample for storage. The prepared storage sample was charged into a thermostatic bath set at 50 ℃ and stored. After 1 month from storage, the storage sample was taken out from the thermostatic bath, and the oil-in-water type emulsion cosmetic in the glass bottle was visually observed to confirm the presence or absence of separation. Then, the viscosity at 25 ℃ of the oil-in-water type emulsion cosmetic for which no separation was confirmed was measured by the same method as described above. The viscosity obtained here was referred to as "viscosity over time".

The viscosity change rate (%) was calculated from the initial viscosity and the secular viscosity based on the following formula (1).

The viscosity change rate (%) (initial viscosity-aged viscosity)/initial viscosity) x 100

If no separation is observed by the above observation and the viscosity change rate is less than 30%, it is judged to be an oil-in-water type emulsion cosmetic having excellent stability with time. In tables 1 to 3, the case where the viscosity change rate was less than 30% was designated as "stable", the case where the viscosity change rate was 30% or more was designated as "unstable", and the case where separation was confirmed was designated as "separated".

2. Feeling of use

The following evaluations (1) and (2) were carried out on the feel of use of the oil-in-water emulsion cosmetic. In the evaluation of the "1. stability over time", the evaluation of the feeling of use was not performed for the substance evaluated as "unstable" or "isolated".

(1) Sticky feeling

As one of the feelings of use of the oil-in-water type emulsion cosmetics, evaluation of a sticky feeling was performed.

Please 3 evaluation test persons, apply the just prepared oil-in-water emulsion cosmetic on the face with fingers under the environment of the ambient air temperature of 25 ℃ and 50% RH, touch the skin of the applied part with hands, and determine the presence or absence and degree of the sticky feeling.

After the judgment results of the evaluation testers were ranked according to the following evaluation criteria, the evaluation points of the ranks were set to a: 4, B: point 3, C: point 2, D: the average of 3 evaluation points was calculated at point 1. In addition, in calculating the average value, the 1 st digit below the decimal point was rounded. Then, the evaluation level corresponding to the average value is set as the evaluation result.

When the evaluation result was "a", "B", or "C", it was judged that the oil-in-water emulsion cosmetic in which the sticky feeling after application to the skin was suppressed was the oil-in-water emulsion cosmetic. The most excellent evaluation scale was "a".

Evaluation criteria-

A: no sticky feeling was felt at all.

B: a sticky feel was slightly felt but to an unnoticed extent.

C: a sticky feel was felt but to an acceptable degree.

D: a strong sticky feeling was felt.

(2) Sense of moisture retention

As one of the feelings of use of the oil-in-water type emulsion cosmetics, evaluation of a moisturizing feeling was performed.

Please 3 evaluation test persons, who applied the oil-in-water emulsion cosmetic just prepared on the face with fingers under an environment of an ambient air temperature of 25 ℃ and 50% RH, and 1 minute after the application, evaluated the presence or absence and degree of a moist touch (so-called moisturizing feel) remaining on the surface of the skin.

After assigning a rating to the judgment result of each evaluation tester according to the following evaluation criteria, the evaluation point of each rating is set as a: 4, B: point 3, C: point 2, D: the average of 3 evaluation points was calculated at point 1. In addition, in calculating the average value, the 1 st digit below the decimal point was rounded. Then, the evaluation level corresponding to the average value is set as the evaluation result.

If the evaluation result is "a", "B", or "C", it is judged that the oil-in-water type emulsion cosmetic in which the sticky feeling after application to the skin is suppressed is obtained. The most excellent evaluation scale was "a".

Evaluation criteria-

A: the moist touch feeling remaining on the surface of the skin is very strong.

B: the wet touch feeling remaining on the surface of the skin is strong.

C: the wet feel remaining on the surface of the skin is very little.

D: there was no wet touch left on the skin surface.

[ Table 3]

In tables 1 to 3, "-" indicated in composition columns means that no corresponding component is contained.

In table 3, "-" indicated in the column of evaluation means that no corresponding evaluation was performed.

In tables 1 to 3, (PEG-240/decyltetradecanolpolyether-20/HDI) copolymer, trimethylglycine, stearyl glycyrrhetinate, a water-absorbing oil agent, a thickening polysaccharide, an acrylic polymer, water, ester oil, hydrocarbon oil, and components other than the other components were respectively classified and labeled "(a)", "(B)", "(C)", "(D)", "(E)", "(F)", "(G)", "(H)", "(I)", and "(J)", for easy understanding.

The details of each component described in tables 1 to 3 are as follows.

< (A): (PEG-240/decyltetradecylpolyether-20/HDI) copolymer >

(PEG-240/decyltetradecylpolyether-20/HDI) copolymer [ trade name: thickener (registered trademark) GT-700, manufactured by ADEKA CORPORATION ]

< (B): trimethylglycine >

Trimethylglycine [ trade name: aminocoat (registered trademark), ASAHI KASEI FINECHEM co., ltd. manufactured)

< (C): stearyl glycyrrhetinate >

Stearyl glycyrrhetinate [ trade name: SEA Augretinol (registered trademark), Maruzen Pharmaceuticals CO., manufactured by LTD

< (D): water-holding oil solution >

Lauroyl glutamic acid di (phytosterol/octyldodecyl) ester

[ trade name: erdu (registered trade mark) PS-203, AJINOMOTO co, inc

Lauroyl glutamic acid di (cholesterol/octyl dodecyl) ester

[ trade name: erdu (registered trademark) CL-202, AJINOMOTO co., inc

Dimer dilinoleic acid di (isostearyl/phytosterol) ester

[ trade name: LUSPLAN (registered trademark) PI-DA manufactured by Nippon Fine Chemical)

Dimer dilinoleic acid di (phytosterol/isostearyl/cetyl/stearyl/behenyl) ester

[ trade name: plantools (registered trademark) -S, manufactured by Nippon Fine Chemical ]

Dipentaerythritol trihydroxystearate [ trade name: saracos (registered trade Mark) WO-6, Nisshin OilliO Group, Ltd

Dipentaerythritol tetra (hydroxystearic acid/isostearic acid) (trade name: COSMOL (registered trademark) 168EV, Nisshin OilliO Group, manufactured by Ltd ]

< (E): thickening polysaccharide >

Gellan gum [ trade name: KELCOGEL (registered trademark) CG-HA, SANSHO Co., Ltd

Carrageenan [ trade name: GENUGEL (registered trademark) SWG-J, SANSHO Co., Ltd.)

Alcaligenes polysaccharide [ trade name: alcaligenes polysaccharide, Hakuto Co., Ltd

Pullulan [ trade name: pullulan polysaccharide, Hayashibara Co, made by Ltd ] for cosmetic

Locust bean gum/xanthan gum [ trade name: NOMCORT (registered trade Mark) CG, Nisshin OilliO Group, Ltd

< (F): acrylic Polymer >

(acrylate/alkyl (C10-30) acrylate) copolymer [ trade name: pemulen (registered trademark) TR-2, manufactured by The Lubrizol Corporation)

Carboxyvinyl polymer [ trade name: carbopol (registered trademark) ETD 2050 Polymer, manufactured by The Lubrizol Corporation

(Acryloyldimethyl ammonium taurate/VP) copolymer [ trade name: aristoflex (registered trademark) AVC, Clariant Japan K.K. system ]

< (G): water >

Water (pure water)

< (H): ester oil >

Glycerol tri (ethylhexanoate) ester [ trade name: T.I.O, Nisshin OilliO Group, Ltd

< (I): hydrocarbon oil >

Vaseline [ trade name: SUN WHITE (registered trademark) P-200, manufactured by NIKKO RICA CORPORATION ]

< (J): other ingredients >

Sodium chloride [ manufactured by FUJIFILM Wako Pure Chemical Corporation ]

Glycerol (polyol) produced by Sakamoto Yakuhin kogyo Co., Ltd

BG [ DAICEL CHEMICAL INDUSTRIES, LTD. manufactured ] (polyol)

DPG (polyol, KOYO fine chemical corporation)

Water-soluble collagen [ trade name: collagen P (PF), manufactured by Nitta Gelatin Inc.)

Hydrolyzed collagen [ trade name: collagen tripeptide F, JELLICE Co., Ltd.)

Acetylhydroxyproline [ trade name: AHYP, KYOWA HAKKO BIO CO., LTD. system ]

Tocopherol [ trade name: RIKEN E OIL800, RIKEN CORPORATION, manufactured by RIKEN CORPORATION

Retinol palmpurlin [ trade name: RIKEN A Palmitate1000(E), RIKEN VITAMIN CO., LTD

Phenoxyethanol [ FUJIFILM Wako Pure Chemical Corporation ] (preservative)

Potassium hydroxide [ manufactured by FUJIFILM Wako Pure Chemical Corporation ] (pH adjustor)

PEG-60 hydrogenated Castor oil [ Nikko Chemicals Co., Ltd. ] (surfactant)

As shown in tables 1 and 2, the oil-in-water emulsion cosmetics of the examples were all confirmed to have excellent stability over time. Further, it was confirmed that the oil-in-water emulsion cosmetics of the examples all had a good feeling of use because the sticky feeling after application to the skin was suppressed and the moisturizing feeling was obtained after application to the skin.

On the other hand, as shown in Table 3, it was confirmed that the oil-in-water type emulsion cosmetic of comparative example 1 containing no (PEG-240/decyltetradecanolpolyether-20/HDI) copolymer had poor stability with time as compared with the oil-in-water type emulsion cosmetic of examples.

It was confirmed that the oil-in-water type emulsion cosmetic of comparative example 2 containing no trimethylglycine had a strong sticky feeling after being applied to the skin, and had a poor feeling upon use.

It was confirmed that the oil-in-water type emulsion cosmetic of comparative example 3, which did not contain the water-holding oil agent, had no moist feeling left on the skin surface after application to the skin, and had a poor feeling in use.

It was confirmed that the oil-in-water type emulsion cosmetic of comparative example 4 containing no thickening polysaccharide had inferior stability with time to the oil-in-water type emulsion cosmetic of the examples.

It was confirmed that the oil-in-water type emulsion cosmetic of comparative example 5 containing no acrylic polymer had inferior stability with time to the oil-in-water type emulsion cosmetic of examples.

The oil-in-water emulsion cosmetic of comparative example 6, in which the content of the surfactant was more than 0.5% by mass based on the total mass of the oil-in-water emulsion cosmetic, had a strong sticky feeling after application to the skin, and had a poor feeling of use.

Claims

1. An oil-in-water type emulsion cosmetic comprising:

(PEG-240/decyltetradecylpolyether-20/HDI) copolymer;

trimethylglycine;

stearyl glycyrrhetinate;

water-holding oil solution;

thickening polysaccharides;

an acrylic polymer; and

the amount of water is controlled by the amount of water,

2. The oil-in-water type emulsion cosmetic according to claim 1,

the water-holding oil agent is at least 1 selected from the group consisting of lauroyl glutamic acid di (phytosterol/octyldodecyl) ester, lauroyl glutamic acid di (cholesterol/octyldodecyl) ester, dimerized dilinoleic acid di (isostearyl/phytosterol) ester, dimerized dilinoleic acid di (phytosterol/isostearyl/cetyl/stearyl/behenyl) ester, trimeric hydroxypivalyl hydroxystearate dipentaerythritol ester and tetrakis (hydroxystearate/isostearyl) dipentaerythritol ester.

3. The oil-in-water type emulsion cosmetic according to claim 1,

4. The oil-in-water type emulsion cosmetic according to claim 1,

the acrylic polymer is at least 1 selected from the group consisting of an (acrylate/alkyl (C10-30) acrylate) copolymer, a carboxyvinyl polymer, and an (ammonium acryloyldimethyltaurate/VP) copolymer.

5. The oil-in-water type emulsion cosmetic according to claim 1, which further comprises an ester oil.

6. The oil-in-water type emulsion cosmetic according to claim 5,

7. The oil-in-water type emulsion cosmetic according to claim 1, further comprising a hydrocarbon oil.

8. The oil-in-water type emulsion cosmetic according to claim 7,

9. The oil-in-water type emulsion cosmetic according to claim 7,

the hydrocarbon oil is vaseline.

10. The oil-in-water type emulsion cosmetic according to any one of claims 1 to 9,

the thickening polysaccharide is gellan gum.