JP2022147656A - Oil-in-water emulsified cosmetic - Google Patents

Abstract

To provide an oil-in-water emulsified cosmetic simultaneously improved in many properties in use.SOLUTION: Provided is an oil-in-water emulsified cosmetic comprising: (A) a hydrophilic spherical silica powder; (B) an alkyl-modified carboxyvinyl polymer; and (C) an oily component. The content of the (A) hydrophilic spherical silica powder is 5 mass% or more relative to the total amount of the oil-in-water emulsified cosmetic. The content of the (C) oily component is 0.1 to 2.5 mass% relative to the total amount of the oil-in-water emulsified cosmetic.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to an oil-in-water emulsified cosmetic.

Conventionally, various oil-in-water emulsified cosmetics for applying to the skin to enhance the texture of the skin have been studied. Such oil-in-water emulsified cosmetics are required to have various properties during use.

For example, in Patent Document 1, the effect of keratin exfoliation by the powder lasts, and the feeling of use on the skin is good due to moderate viscosity, spreadability, and slipperiness, and the skin feels smooth and transparent after use. proposed a cosmetic containing a specific silica powder, a specific fibrous powder, and a thickener in specific amounts. Further, in Patent Document 2, polyacrylic acid or a metal salt thereof, an alkyl-modified carboxyvinyl polymer, and a specific polyethylene glycol are each added in specific amounts in order to satisfy usability such as spinnability, freshness and non-stickiness. A compounded oil-in-water type external preparation for skin has been proposed. In order to satisfy various properties, various ingredients have been studied so far, but further improvement of the properties is required.

JP 2007-302563 A JP 2009-286757 A

In general, for oil-in-water emulsified cosmetics, if the desired properties are improved according to the purpose, it becomes difficult to balance with other properties, and it is difficult to satisfy all the properties at the same time. Therefore, there is still a demand for an oil-in-water emulsified cosmetic that simultaneously improves many properties while maintaining such a balance.

The present inventors investigated the improvement of the freshness during use and the dry feeling after use by blending a large amount (for example, 5% by mass or more) of silica powder in an oil-in-water emulsified cosmetic. A new problem was discovered in which the powder that fell on the fingerprint of the finger would stand out in white.

As a result of intensive studies to solve the above problems, the present inventors have found that an oil-in-water emulsified cosmetic containing a large amount of silica powder is blended with an alkyl-modified carboxyvinyl polymer and an oily component, and an oily component is added. The inventors have found that the above problems can be solved by adjusting the content of, and have completed the present invention.

According to the present invention, the following inventions are provided.
[1] (A) hydrophilic spherical silica powder,
(B) an alkyl-modified carboxyvinyl polymer, and (C) an oily component, an oil-in-water emulsified cosmetic,
The content of the hydrophilic spherical silica powder (A) is 5% by mass or more with respect to the total amount of the oil-in-water emulsified cosmetic,
The content of the (C) oily component is 0.1% by mass or more and 2.5% by mass or less with respect to the total amount of the oil-in-water emulsified cosmetic.
Oil-in-water emulsified cosmetic.
[2] The oil-in-water emulsified cosmetic according to [1], wherein the alkyl-modified carboxyvinyl polymer (B) is an (acrylates/alkyl acrylate (C10-30)) crosspolymer.
[3] The content of the (B) alkyl-modified carboxyvinyl polymer is 0.01% by mass or more and 0.5% by mass or less with respect to the total amount of the oil-in-water emulsified cosmetic, [1] or [ 2].
[4] The oil-in-water emulsified cosmetic according to any one of [1] to [3], further comprising (D) a water-soluble polymer.
[5] The oil-in-water emulsion cosmetic according to [4], wherein the (D) water-soluble polymer is at least one selected from the group consisting of polyethylene glycol having a molecular weight of 4000 or more and polyvinyl alcohol having a molecular weight of 4000 or more. .
[6] The oil-in-water according to [4] or [5], wherein the content of the water-soluble polymer (D) is 0.1% by mass or more relative to the total amount of the oil-in-water emulsified cosmetic. type emulsion cosmetics.
[7] The oil-in-water emulsified cosmetic according to any one of [1] to [6], further comprising (E) a moisturizing agent.

According to the present invention, many properties at the time of use, specifically, freshness during use, no stickiness after use, dry feeling, and no whitening due to powder, are improved at the same time. An emulsified cosmetic is provided.

[Oil-in-water emulsified cosmetic]
The oil-in-water emulsified cosmetic composition according to the present invention contains (A) a hydrophilic spherical silica powder, (B) an alkyl-modified carboxyvinyl polymer, and (C) an oily component as essential components. Furthermore, the oil-in-water emulsified cosmetic according to the present invention may contain (D) a water-soluble polymer, (E) a moisturizing agent, an aqueous solvent, and other ingredients, depending on the purpose. The oil-in-water emulsified cosmetic composition according to the present invention can simultaneously improve freshness during use, non-sticky feeling after use, dry feeling, and non-whitening caused by powder. Hereinafter, each component contained in the oil-in-water emulsified cosmetic composition according to the present invention will be described in detail.

((A) hydrophilic spherical silica powder)
As the hydrophilic spherical silica powder, conventionally known silica powder can be used as long as it is hydrophilic and substantially spherical, preferably truly spherical. The silica powder is preferably porous from the viewpoint of compatibility with other components.

The volume average particle size of the hydrophilic spherical silica powder is not particularly limited, but is preferably from 1 μm to 30 μm, more preferably from 2 μm to 15 μm, and even more preferably from 3 μm to 10 μm. The volume average particle diameter of the hydrophilic spherical silica powder can be measured according to the laser diffraction method.

The oil absorption of the hydrophilic spherical silica powder is not particularly limited, but is preferably 10 ml/100 g or more and 500 ml/100 g or less, more preferably 30 ml/100 g or more and 300 ml/100 g or less, and still more preferably 50 ml/100 g or more and 200 ml. /100 g or less. The oil absorption of the hydrophilic spherical silica powder can be measured according to JIS Z 8830.

The BET specific surface area of the hydrophilic spherical silica powder is not particularly limited, but is preferably 10 m ² /g or more and 700 m ² /g or less, more preferably 50 m ² /g or more and 500 m ² /g or less, and still more preferably It is 100 m ² /g or more and 400 m ² /g or less. The BET specific surface area of the hydrophilic spherical silica powder can be measured according to JIS K 5101-13-2.

A commercially available product can be used as the hydrophilic spherical silica powder. Hydrophilic spherical silica powders include, for example, Sunsphere H-52, L-51S, H-121 (AGC Si Tech Co., Ltd.), Godball E-6C (Suzuki Yushi Kogyo Co., Ltd.), Satinia M5, spherical Silica P-1500 (Nikki Shokubai Kasei Co., Ltd.), TMS-10 (Tayca Co., Ltd.), etc. are preferably used.

The content of the hydrophilic spherical silica powder is 5% by mass or more, more preferably 7% by mass or more and 15% by mass or less, and still more preferably 8% by mass or more, relative to the total amount of the oil-in-water emulsified cosmetic. It is 12% by mass or less. If the content of the hydrophilic spherical silica powder is within the above numerical range, the oil-in-water emulsified cosmetic will be excellent in freshness during use and dry feeling after use.

((B) alkyl-modified carboxyvinyl polymer)
Suitable examples of alkyl-modified carboxyvinyl polymers include (acrylates/alkyl acrylates (C10-C30)) crosspolymers. The (acrylates/alkyl acrylate (C10-C30)) crosspolymer may be a commercially available product such as Pemulen TR-2 Polymeric Emulsifier (manufactured by Lubrizol Advanced Materials, Inc.).

The content of the alkyl-modified carboxyvinyl polymer is preferably 0.01% by mass or more and 0.5% by mass or less, more preferably 0.02% by mass or more and 0.5% by mass or less, relative to the total amount of the oil-in-water emulsified cosmetic composition. It is 2% by mass or less, more preferably 0.05% by mass or more and 0.15% by mass or less. When the content of the alkyl-modified carboxyvinyl polymer is within the above numerical range, the oil-in-water emulsified cosmetic has excellent freshness during use.

((C) oily component)
As the oil component, for example, synthetic ester oil, liquid fat, solid fat, wax, hydrocarbon, higher fatty acid and the like can be used. These oily components may be used singly or in combination of two or more.

Synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, and myristyl lactate. , lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, apple diisostearyl acid, glyceryl di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate , glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptyl undecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid 2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, sebacin di-2-ethylhexyl acid, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, triethyl citrate and the like.

Examples of liquid oils include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, and linseed oil. , safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, sinagiri oil, Japanese paulownia oil, jojoba oil, germ oil, triglycerin, and the like.

Examples of solid fats and oils include cacao butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, hydrogenated beef tallow, palm kernel oil, lard, beef bone fat, Japanese wax kernel oil, hydrogenated oil, beef leg fat, Japanese wax, hydrogenated castor oil and the like.

Waxes include, for example, beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, wart wax, whale wax, montan wax, bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, isopropyl lanolin fatty acid, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, POE hydrogenated lanolin alcohol ether and the like.

Hydrocarbon oils include, for example, liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, toric acid, isostearic acid, linoleic acid, linoleic acid, eicosapentaenoic acid (EPA), docosahexaenoic acid ( DHA) and the like.

The content of the oil component is 0.1% by mass or more and 2.5% by mass or less, more preferably 0.3% by mass or more and 2% by mass or less, relative to the total amount of the oil-in-water emulsified cosmetic, More preferably, it is 0.5% by mass or more and 1% by mass or less. When the content of the oily component is within the above numerical range, the oil-in-water emulsified cosmetic is excellent in freshness during use, no stickiness after use, and no whitening due to powder.

((D) water-soluble polymer)
As the water-soluble polymer, for example, at least one selected from the group consisting of polyethylene glycol having a molecular weight of 4000 or more and polyvinyl alcohol having a molecular weight of 4000 or more can be used. The molecular weights of polyethylene glycol and polyvinyl alcohol are preferably 4000 or more and 50000 or less, more preferably 10000 or more and 30000 or less. By using polyethylene glycol and polyvinyl alcohol having molecular weights within the above numerical range, the oil-in-water emulsified cosmetic is excellent in freshness during use, no stickiness after use, and no whitening due to powder. becomes.

Commercially available products can be used as the water-soluble polymer. As polyethylene glycol, for example, PEG-75 (molecular weight 4000), PEG-150 (molecular weight 6000) and PEG-400 (molecular weight 20000) are preferably used.

The content of the water-soluble polymer is 0.1% by mass or more and 2.5% by mass or less, more preferably 0.2% by mass or more and 1.5% by mass or less, relative to the total amount of the oil-in-water emulsified cosmetic. or less, more preferably 0.3% by mass or more and 1% by mass or less. If the content of the water-soluble polymer is within the above numerical range, the oil-in-water emulsified cosmetic is excellent in freshness during use, no stickiness after use, and no whitening due to powder. Become.

((E) moisturizing agent)
The moisturizing agent is not particularly limited, and conventionally known moisturizing agents for cosmetics can be used. Examples of such moisturizing agents include polyhydric alcohols and glycol ethers, more specifically glycerin, propanediol, ethylene glycol, diethylene glycol, dipropylene glycol, 1,3-butylene glycol, hexamethylene glycol, and isoprene glycol. , polyethylene glycol, hyaluronic acid, xylitol, sorbitol, maltitol, diglycerin (EO) PO adducts, and the like.

The content of the moisturizing agent is preferably 1% by mass or more and 20% by mass or less, more preferably 3% by mass or more and 15% by mass or less, and still more preferably 5% by mass, relative to the total amount of the oil-in-water emulsified cosmetic. It is more than mass % and below 10 mass %.

(aqueous solvent)
The aqueous solvent is not particularly limited, and conventionally known aqueous solvents can be used. Aqueous solvents can include, for example, water, alcohols, or mixtures thereof.

As water, water used in cosmetics can be used, for example, purified water, ion-exchanged water, tap water, and the like can be used.

As the alcohol, for example, lower alcohols such as ethanol, 1-propanol, 2-propanol, isobutyl alcohol and t-butyl alcohol can be used.

The content of the aqueous solvent is not particularly limited, and can be appropriately adjusted according to the content of other components.

(other ingredients)
The oil-in-water emulsified cosmetic according to the present invention can contain other ingredients that can be blended in the oil-in-water emulsified cosmetic within a range that does not impair the effects of the present invention. Such other ingredients include thickeners, dispersants, neutralizers, chelating agents, preservatives, antioxidants, stabilizers, surfactants, colorants, perfumes, and the like. These components can be appropriately blended according to the dosage form of the oil-in-water emulsified cosmetic.

The oil-in-water emulsified cosmetic according to the present invention can be produced according to a conventional method. For example, at least a portion of the oily component is added to the aqueous component, and the mixture is emulsified using a homomixer or the like. Subsequently, the rest of the oily component and silica powder are added to this and stirred and mixed to prepare.

The viscosity at 30° C. of the oil-in-water emulsified cosmetic according to the present invention is not particularly limited, but is preferably 500 to 10000 mPa·s, more preferably 1000 to 5000 mPa·s, still more preferably 1500 to 3000 mPa·s. is. The viscosity at 30° C. was measured using a commercially available BH viscometer, rotor No. 3 and measured at a rotation speed of 12 rpm.

The pH at room temperature of the oil-in-water emulsified cosmetic composition according to the present invention is not particularly limited, but is preferably 5-8, more preferably 5.5-7.5, still more preferably 6-7. In addition, pH at 30 degreeC is the value measured using the commercially available pH measuring device.

(Application)
The oil-in-water emulsified cosmetic composition according to the present invention can be suitably used as cosmetic products such as lotions, beauty essences, milky lotions, and creams.

The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amount is expressed in mass%.

[Examples 1 to 7, Comparative Examples 1 to 6]
<Preparation of oil-in-water emulsified cosmetic>
Oil-in-water emulsified cosmetics of Examples and Comparative Examples were prepared with the formulations shown in Tables 1 and 3. In addition, in Tables 1 and 3, the blending ratio of each component is % by mass.

<Performance evaluation of oil-in-water emulsified cosmetic>
[viscosity]
The oil-in-water emulsified cosmetic prepared above was measured with a BH type viscometer manufactured by Anton Paar, model number: ViscoQC 100-L, after 1 hour of production, using a rotor No. 3, the viscosity (mPa·s) at 30° C. was measured at a rotation speed of 12 rpm. The measurement results are shown in Tables 2 and 4.

[pH]
The pH of the oil-in-water emulsified cosmetic prepared above was measured using a pH meter at room temperature. The measurement results are shown in Tables 2 and 4.

<Usability evaluation of oil-in-water emulsified cosmetic>
With regard to the usability of the oil-in-water emulsified cosmetic composition prepared above, freshness, non-stickiness, dry feeling, and whitening due to powder were evaluated according to the following criteria.

[Sticky]
(Evaluation method)
Ten women in their 30s and 40s who had undergone sensory evaluation training and were able to evaluate according to a certain standard were selected as a panel of experts. The expert panel used each oil-in-water emulsified cosmetic on the hands and evaluated the non-stickiness after use. Each oil-in-water emulsified cosmetic was evaluated on a scale of 5 according to the following absolute evaluation, and evaluation points were assigned. From the total evaluation points of all the panelists for each oil-in-water emulsified cosmetic, the average value was calculated and judged. Evaluation results are shown in Tables 2 and 4. If the evaluation results are grades A to D, it is acceptable.
<Evaluation points>
5 points: no stickiness at all 4 points: almost no stickiness 3 points: little stickiness 2 points: stickiness 1 point: strong stickiness <Evaluation Criteria>
A: Average score of 4.5 or more B: Average score of 4.0 or more and less than 4.5 C: Average score of 3.5 or more and less than 4.0 D: Average score of 3.0 or more Less than 3.5 points E: Average score less than 3.0 points

[Freshness]
(Evaluation method)
Ten women in their 30s and 40s who had undergone sensory evaluation training and were able to evaluate according to a certain standard were selected as a panel of experts. The expert panel used each oil-in-water emulsified cosmetic on the hands and evaluated the freshness during use. Each oil-in-water emulsified cosmetic was evaluated on a scale of 5 according to the following absolute evaluation, and evaluation points were assigned. From the total evaluation points of all the panelists for each oil-in-water emulsified cosmetic, the average value was calculated and judged. Evaluation results are shown in Tables 2 and 4. If the evaluation results are grades A to D, it is acceptable.
<Evaluation points>
5 points: Very good feeling of freshness 4 points: Good feeling of freshness 3 points: Feeling of freshness 2 points: Almost no feeling of freshness 1 point: No feeling of freshness <Evaluation Criteria>
A: Average score of 4.5 or more B: Average score of 4.0 or more and less than 4.5 C: Average score of 3.5 or more and less than 4.0 D: Average score of 3.0 or more Less than 3.5 points E: Average score less than 3.0 points

[Smooth feeling]
(Evaluation method)
Ten women in their 30s and 40s who had undergone sensory evaluation training and were able to evaluate according to a certain standard were selected as a panel of experts. The expert panel used each oil-in-water emulsified cosmetic on the hands and evaluated the smoothness after use. Each oil-in-water emulsified cosmetic was evaluated on a scale of 5 according to the following absolute evaluation, and evaluation points were assigned. From the total evaluation points of all the panelists for each oil-in-water emulsified cosmetic, the average value was calculated and judged. Evaluation results are shown in Tables 2 and 4. If the evaluation results are grades A to D, it is acceptable.
<Evaluation points>
5 points: very good feeling of dryness 4 points: good feeling of dryness 3 points: feeling of dryness 2 points: almost no feeling of dryness 1 point: no feeling of dryness <Evaluation criteria>
A: Average score of 4.5 or more B: Average score of 4.0 or more and less than 4.5 C: Average score of 3.5 or more and less than 4.0 D: Average score of 3.0 or more Less than 3.5 points E: Average score less than 3.0 points

[Whitening caused by powder]
(Evaluation method)
Ten women in their 30s and 40s who had undergone sensory evaluation training and were able to evaluate according to a certain standard were selected as a panel of experts. The expert panel used each oil-in-water emulsified cosmetic on the hands and evaluated the absence of whitening due to the powder after use. Each oil-in-water emulsified cosmetic was evaluated on a scale of 5 according to the following absolute evaluation, and evaluation points were assigned. From the total evaluation points of all the panelists for each oil-in-water emulsified cosmetic, the average value was calculated and judged. Evaluation results are shown in Tables 2 and 4. If the evaluation results are grades A to D, it is acceptable.
<Evaluation points>
5 points: no whitening caused by the powder is observed 4 points: almost no whitening caused by the powder is observed 3 points: slight whitening caused by the powder is observed 2 points: white floating caused by the powder is not observed 1 point : A lot of white floating due to powder is observed <Evaluation criteria>
A: Average score of 4.5 or more B: Average score of 4.0 or more and less than 4.5 C: Average score of 3.5 or more and less than 4.0 D: Average score of 3.0 or more Less than 3.5 points E: Average score less than 3.0 points

From the above results, all of the oil-in-water emulsified cosmetics according to the present invention are excellent in freshness during use, no stickiness after use, dry feeling, and no whitening due to powder. I understand. In addition, the viscosity of the oil-in-water emulsified cosmetic composition according to the present invention after 1 hour of production was within a range suitable for cosmetics.

Considering the results of the comparative examples together, the oil-in-water emulsified cosmetic composition according to the present invention can simultaneously contain a specific amount of hydrophilic spherical silica powder, an alkyl-modified carboxyvinyl polymer, and a specific amount of an oily component. It can be seen that excellent results are achieved in Furthermore, even if an oil-in-water emulsified cosmetic containing a large amount of hydrophilic spherical silica powder is mixed with an alkyl-modified carboxyvinyl polymer, the freshness during use and the stickiness after use deteriorate when the amount of the oil component is large. also know to do

Claims (7)

(A) hydrophilic spherical silica powder,
(B) an alkyl-modified carboxyvinyl polymer, and (C) an oily component, an oil-in-water emulsified cosmetic,
The content of the hydrophilic spherical silica powder (A) is 5% by mass or more with respect to the total amount of the oil-in-water emulsified cosmetic,
The content of the (C) oily component is 0.1% by mass or more and 2.5% by mass or less with respect to the total amount of the oil-in-water emulsified cosmetic.
Oil-in-water emulsified cosmetic. The oil-in-water emulsified cosmetic according to claim 1, wherein the (B) alkyl-modified carboxyvinyl polymer is an (acrylates/alkyl acrylate (C10-30)) crosspolymer. 3. The content of the (B) alkyl-modified carboxyvinyl polymer is 0.01% by mass or more and 0.5% by mass or less with respect to the total amount of the oil-in-water emulsified cosmetic composition. Oil-in-water emulsified cosmetic. (D) The oil-in-water emulsified cosmetic according to any one of claims 1 to 3, further comprising a water-soluble polymer. 5. The oil-in-water emulsified cosmetic according to claim 4, wherein (D) the water-soluble polymer is at least one selected from the group consisting of polyethylene glycol having a molecular weight of 4000 or more and polyvinyl alcohol having a molecular weight of 4000 or more. The oil-in-water emulsified cosmetic according to claim 4 or 5, wherein the content of the water-soluble polymer (D) is 0.1% by mass or more relative to the total amount of the oil-in-water emulsified cosmetic. (E) The oil-in-water emulsified cosmetic according to any one of claims 1 to 6, further comprising a moisturizing agent.