JP2020189796A - Cosmetic for eyelashes - Google Patents

Abstract

To provide cosmetic for eyelashes which has water resistance to water of room temperature and can be easily removed by hot water.SOLUTION: Cosmetic for eyelashes contains polymers having a (meth)acrylic acid structure unit and a monosaccharide unit in a molecule, saturated fatty acid, and alkali agent. It is desirable that the content of water be less than 5 mass%.SELECTED DRAWING: None

Description

The present invention relates to eyelash cosmetics such as mascara.

Conventionally, as cosmetics for eyelashes, for example, a nonionic surfactant and a polyhydric alcohol are contained, and the blending amount of the nonionic surfactant is 1 to 10% by mass, and the blending amount of the polyhydric alcohol. A mascara having a content of 1 to 10% by mass is known (Patent Document 1).

The mascara described in Patent Document 1 can be easily removed from the eyelashes by applying it to the eyelashes or the like and then using a commercially available facial cleanser or rinsing with hot water.

However, the mascara described in Patent Document 1 is not always sufficiently water resistant to water at room temperature. Therefore, there is a problem that it does not have both the performance of having water resistance to water at room temperature and the performance of being easily removed by hot water.

Japanese Unexamined Patent Publication No. 2016-160253

In view of the above problems and the like, it is an object of the present invention to provide a cosmetic for eyelashes which has water resistance to water at room temperature and can be easily removed with hot water.

The cosmetic for eyelashes according to the present invention is characterized by containing a polymer having a (meth) acrylic acid structural unit and a monosaccharide unit in the molecule, a saturated fatty acid, and an alkaline agent.

In the eyelash cosmetics according to the present invention, the water content is preferably less than 5% by mass.

The cosmetic for eyelashes of the present invention has the effect of having water resistance to water at room temperature and being easily removed with hot water.

An embodiment of the eyelash cosmetic according to the present invention will be described below.

The eyelash cosmetics of the present embodiment include a polymer having a (meth) acrylic acid structural unit and a monosaccharide unit in the molecule, a saturated fatty acid, and an alkaline agent. In the eyelash cosmetics of the present embodiment, the water content is preferably less than 5% by mass.

The eyelash cosmetic of the present embodiment has water resistance to water at room temperature when applied to eyelashes and the like. On the other hand, when it comes into contact with water (hot water) having a relatively high temperature, it is considered that saturated fatty acids are softened by heat. In addition, saturated fatty acids become fatty acid salts due to the basicity of the alkaline agent and dissolve in hot water. The dissolution of the fatty acid salt enables contact between the polymer and water. Since the polymer swells greatly when it absorbs water, the hot water penetrates into the eyelash cosmetics. For this reason, it is considered that the eyelash cosmetics can be easily removed with hot water.

The above-mentioned polymer is a compound having a polymer chain in which at least one of (meth) acrylic acid and (meth) acrylate is polymerized and a sugar chain in which a monosaccharide is bound in the molecule. Hereinafter, the above polymer may be simply referred to as "component A".
In the present specification, the (meth) acrylic acid structural unit is obtained by polymerizing at least one selected from a methacrylate (methacrylic acid ester) monomer, an acrylate (acrylic acid ester) monomer, a methacrylic acid monomer, and an acrylic acid monomer. It is a unit that constitutes the main chain of the polymer molecule.
Further, in the present specification, the monosaccharide unit is a unit derived from a monosaccharide constituting a sugar chain.

As the above polymer, a polymer having a structural unit of a (meth) acrylic acid monomer and a glucose unit in the molecule is preferable. Specifically, acrylate-grafted starch is preferable.

Temporarily, instead of the above polymer, only a polymer having only the structural unit of the (meth) acrylic acid monomer (for example, a synthetic polymer such as acrylate crosspolymer-2-Na) or a polymer having only a monosaccharide unit (for example, For example, if only a water-soluble polysaccharide such as xanthan gum) is blended in the cosmetics for eyebrows, it becomes difficult to wash the cosmetics for eyelashes with hot water, and it may be difficult to remove them.

The above-mentioned saturated fatty acid is a saturated fatty acid having 12 or more and 22 or less carbon atoms. As the saturated fatty acid, at least one selected from the group consisting of lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid is preferable. The saturated fatty acids mentioned above may be in a salt state.
Hereinafter, the above saturated fatty acid may be simply referred to as "B component".

If only unsaturated fatty acids are added to the eyelash cosmetics instead of the above saturated fatty acids, the water resistance may be poor or it may be difficult to wash the eyelash cosmetics with hot water.

Examples of the above-mentioned alkaline agent include inorganic alkaline agents such as ammonia and alkali metal hydroxides, and organic alkaline agents such as organic amine compounds. As the above alkaline agent, an organic alkaline agent is preferable. Hereinafter, the above alkaline agent may be simply referred to as "C component".
As the organic alkaline agent, an organic amine compound is preferable. Examples of the organic amine compound include an organic primary amine compound, an organic secondary amine compound, and an organic tertiary amine compound.

Examples of the organic primary amine compound include 2-amino-2-methyl-1,3-propanediol (AMPD), 2-amino-2-methyl-1-propanol (AMP), and monoethanolamine (MEA). Can be mentioned.
Examples of the organic secondary amine compound include diethanolamine (DEA).
Examples of the organic tertiary amine compound include triethanolamine (TEA) and the like.
As the organic amine compound, an organic primary amine compound is preferable. As a result, when the eyelash cosmetics are washed with hot water, the organic amine compound can exhibit stronger basicity by contact with water.

As the organic amine compound, an organic amine compound having a hydroxy group is preferable, and an organic primary amine compound having a hydroxy group is more preferable. By having a hydroxy group, the affinity between the alkaline agent and water becomes higher, so that when the eyelash cosmetics are washed with hot water, they can exhibit stronger basicity. Therefore, the saturated fatty acid becomes a fatty acid salt more sufficiently, and can function more sufficiently as a cleaning agent.

Specifically, as the organic amine compound, 2-amino-2-methyl-1,3-propanediol (AMPD), 2-amino-2-methyl-1-propanol (AMP), and triethanolamine ( At least one selected from the group consisting of TEA) is preferable, and 2-amino-2-methyl-1,3-propanediol (AMPD) is more preferable. Since the organic amine compound is 2-amino-2-methyl-1,3-propanediol (AMPD), the performance of having water resistance to water at room temperature and the performance of being easily removed with hot water are more balanced. It has the advantage of being able to combine well.

The cosmetic for eyelashes of the present embodiment preferably contains the above polymer (A component) in an amount of 1% by mass or more, and more preferably 2% by mass or more. Further, it is preferable to contain the above polymer (component A) in an amount of less than 6% by mass, more preferably 4% by mass or less, and further preferably 3% by mass or less.
By containing 1% by mass or more of the above polymer (component A), there is an advantage that the eyelash cosmetics can be more easily washed away with hot water and more sufficient removability can be exhibited. Further, by containing less than 6% by mass of the above polymer (component A), the applied eyelash cosmetics can exhibit better water resistance, and the curls of the eyelashes to which the eyelash cosmetics are applied are applied. There is an advantage that the keeping power can be improved.

The cosmetic for eyelashes of the present embodiment preferably contains the above saturated fatty acid (B component) in an amount of more than 1% by mass, more preferably 4% by mass or more. Further, the saturated fatty acid (B component) is preferably contained in an amount of 16% by mass or less, more preferably 10% by mass or less, and further preferably 8% by mass or less.
By containing the saturated fatty acid (B component) in an amount of more than 1% by mass, there is an advantage that the eyelash cosmetics can be easily washed away with hot water and more sufficient removability can be exhibited. Further, by containing 16% by mass or less of the saturated fatty acid (B component), there is an advantage that the applied eyelash cosmetics can exhibit better water resistance.

The eyelash cosmetic of the present embodiment preferably contains the above alkaline agent (C component) in an amount of 1% by mass or more, and more preferably 2% by mass or more. Further, it is preferable to contain the above alkaline agent (C component) in an amount of 4% by mass or less, and more preferably 3% by mass or less.
By containing 1% by mass or more of the above-mentioned alkaline agent (C component), there is an advantage that the eyelash cosmetics can be more easily washed away with hot water and more sufficient removability can be exhibited. Further, by containing 4% by mass or less of the above-mentioned alkaline agent (C component), there is an advantage that the applied cosmetic for eyelashes can exhibit better water resistance.

In the eyelash cosmetics of the present embodiment, the mass ratio (B / C) of the saturated fatty acid (B component) to the alkaline agent (C component) is preferably 1 or more, and is preferably 3 or more. Is more preferable. Such a mass ratio is preferably 7 or less, and more preferably 5 or less.
When the mass ratio is 1 or more and 7 or less, there is an advantage that it becomes easier to wash off the eyelash cosmetics with hot water and more sufficient removability can be exhibited.

In the eyelash cosmetics of the present embodiment, the mass ratio (B / A) of the saturated fatty acid (component B) to the polymer (component A) is preferably 1 or more. Such a mass ratio is preferably 6 or less.

In the eyelash cosmetics of the present embodiment, the mass ratio (C / A) of the alkaline agent (C component) to the polymer (A component) is preferably 0.3 or more. Such a mass ratio is preferably 2.0 or less.

The eyelash cosmetics of the present embodiment preferably contain acrylate-grafted starch as the polymer and an organic primary amine compound having a hydroxy group as the alkaline agent. This has the advantage that it is possible to have a better balance between the performance of having water resistance to water at room temperature and the performance of being easily removed by hot water.

In addition to the above components, the cosmetic for eyelashes of the present embodiment includes oily components such as liquid oil and solid wax, thickeners for liquid oil, surfactants, coating agents such as silicone resin, and powders such as talc. , Pigments, antibacterial agents and the like may be further contained.

The liquid oil as an oily component is an oil that flows at 20 ° C. Examples of the liquid oil include liquid hydrocarbon oil and liquid ester oil.
Examples of the liquid hydrocarbon oil include liquid paraffin, hydrogenated polyisobutene, and isododecane.
Solid wax as an oily component does not flow at 20 ° C. Examples of the solid wax include hydrocarbon wax, silicone wax, and plant-derived wax.
Examples of the hydrocarbon wax include paraffin wax, microcrystalline wax, and selecin wax.
Examples of the silicone wax include bisPEG-18 ethyl ether dimethylsilane.
Examples of the plant-derived wax include carnauba wax, candelilla wax, Japan wax, and rice wax.

Examples of the liquid oil thickener include dextrin fatty acid ester and disteardimonium hectorite.

Examples of the surfactant include (polyoxyethylene) sorbitan fatty acid ester, (polyoxyethylene) sorbit fatty acid ester, (poly) glycerin fatty acid ester, polyethylene glycol fatty acid ester and the like.

Examples of the coating agent include trimethylsiloxysilicic acid and polymethylsilsesquioxane.

Examples of the powder include talc, kaolin, mica, silica and the like.

Examples of the pigment include black iron oxide, gunjo, konjo, carbon black and the like.

In the eyelash cosmetics of the present embodiment, the water content is preferably less than 5% by mass, more preferably less than 3% by mass, and even more preferably less than 1% by mass. Since the eyelash cosmetic contains almost no water, it is possible to prevent the above-mentioned hydrophilic polymer from swelling in water. Since the above polymer hardly swells in water in a state where there is almost no water, it has a low affinity with water at room temperature. Therefore, the applied eyelash cosmetics can exhibit better water resistance to water at room temperature. On the other hand, when washed with hot water, the hot water swells the polymer and increases its volume. As a result, the applied eyelash cosmetics can be easily removed with hot water.

Subsequently, a method for producing the above-mentioned eyelash cosmetics will be described.

The above-mentioned eyelash cosmetics can be produced by mixing and stirring each component to be blended. As a device for stirring, a general device can be used. If necessary, the mixture may be stirred while being heated.

The above eyelash cosmetics are usually used as mascara. Mascara is applied to the eyelashes and used. The above eyelash cosmetics are not particularly restricted to the classification of cosmetics, quasi-drugs, pharmaceuticals, etc. under the Pharmaceutical Affairs Law.

The above eyelash cosmetics have water resistance to water at room temperature and are easily washed away with hot water.
Usually, normal temperature water is water having a temperature of 5 ° C. or higher and 25 ° C. or lower, and hot water is water having a temperature of 35 ° C. or higher and 45 ° C. or lower.

The cosmetics for eyelashes of the present invention are as illustrated above, but the present invention is not limited to the embodiments described above. Further, in the present invention, various forms adopted in general cosmetics, external preparations for skin and the like can be adopted as long as the effects of the present invention are not impaired.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

(Test Examples 1 to 16)
Mascaras were produced by mixing each raw material according to the formulation shown in Table 1 or Table 2, respectively.
Specifically, each raw material was heated and melted and then mixed to produce mascara.

See below for details of each ingredient in Tables 1 and 2.
"Polymer" (A component)
・ Sodium acrylate graft starch:
Sodium salt of a compound obtained by graft-polymerizing acrylic acid on starch ・ Acrylate crosspolymer-2-sodium:
(Meta) Acrylic acid or a simple ester thereof Sodium salt / polyvinyl alcohol of a compound obtained by cross-linking a copolymer of one or more monomers:
Xanthan gum, a homopolymer of vinyl alcohol monomer:
Structure "fatty acid" (component B) in which a side chain having mannose and glucuronic acid is bonded to a main chain in which glucose is connected.
-In () in each table, the numerical value in the first row indicates the number of carbon atoms, and the numerical value in the latter row indicates the number of unsaturated bonds "alkaline agents (both are organic amine compounds)" (C component).
2-Amino-2-methyl-1,3-propanediol: AMPD
(Contains primary amine hydroxy group)
-2-Amino-2-methyl-1-propanol: AMP
(Contains primary amine hydroxy group)
-Triethanolamine: TEA (containing tertiary amine hydroxy group)

<Evaluation of water resistance at room temperature>
A coating film formed by applying the mascara produced as described above to a glass plate and drying at room temperature for 6 hours was used as a test sample.
After allowing water at about 20 ° C. to flow down the test sample (coating film) for 1 minute, the test sample (coating film) was rubbed with a finger, and the degree of collapse of the coating film was visually evaluated. It was evaluated on a 4-point scale according to the following evaluation criteria.
◎: No coating film on the finger 〇: Slight coating film on the finger △: Coating film on the finger ×: The coating film runs off the glass plate

<Evaluation of washability with hot water at 40 ° C>
The evaluation was carried out in the same manner as in the above evaluation test except that the temperature of the flowing water was changed to 40 ° C.

<Evaluation of basic performance (curl keeping power)>
A usage test was conducted by 5 panelists and evaluated according to the absolute evaluation criteria shown below. Specifically, a score was given, an average value was calculated, and a judgment was made.
Very satisfied 5
Somewhat satisfied 4
Neither 3
Somewhat dissatisfied 2
Very dissatisfied 1
(Judgment by average value)
⊚: ≧ 4
〇: <4,> 3
Δ: ≤3,> 2
×: ≦ 2

The evaluation results of the above usage performance are shown in Tables 1 and 2.

The mascara corresponding to the embodiment (Example) had water resistance to water at room temperature, and was easily removed from the eyelashes with hot water.
On the other hand, the mascara corresponding to the comparative example did not have water resistance to water at room temperature, or was not easily removed from the eyelashes by hot water.
Regarding the curl keeping power, which is the basic performance of mascara, the test example containing saturated fatty acid was better than the test example containing unsaturated fatty acid.

The cosmetic for eyelashes of the present invention is, for example, mascara, and is preferably applied to eyelashes in order to improve the appearance of the eyelashes.

Claims (2)

(Meta) Acrylic acid A cosmetic for eyelashes containing a polymer having a structural unit and a monosaccharide unit in its molecule, a saturated fatty acid, and an alkaline agent. The cosmetic for eyelashes according to claim 1, wherein the water content is less than 5% by mass.