JP2024007126A - Multi-layered liquid cosmetic - Google Patents

Abstract

To provide a multi-layered liquid cosmetic which is easily dispersed in a uniform state during shaking in which the interface of each layer is clearly separated during leaving to stand, has excellent aesthetic properties, is easily spread during application, is rapidly compatible with the skin, causes no stickiness on the skin after application and has an excellent skin moisturizing feeling.SOLUTION: There is provided a multi-layered liquid cosmetic comprising the following components (A) to (E), (A) a hydrocarbon oil which is liquid at 25°C, (B) a triglyceride oil which is liquid at 25°C, (C) a polyol, (D) a pH adjusting agent and (E) water, wherein the ratio of the component (C) in the water layer is 25 mass% or more.SELECTED DRAWING: None

Description

The present invention relates to multilayer liquid cosmetics.

Multilayer cosmetics are known that are separated into a plurality of layers when left to stand, and that are shaken to a uniformly dispersed state before being applied to the skin during use.
For example, in Patent Document 1, a multilayer cosmetic containing a specific nonionic surfactant, a polyhydric alcohol, and a specific liquid oil becomes a uniformly dispersed state when shaken, and the interface between each layer becomes clear when left standing. It is described that it separates and has excellent aesthetic appearance and usability.
In addition, Patent Document 2 describes a two-layer cosmetic containing polyoxyethylene sorbitan fatty acid ester, sodium citrate, and a water-soluble polymer that does not give a strange feeling, has re-emulsifying properties before use, and has two-layer separation after use. It is described as having excellent properties, beautiful appearance, and high safety.

JP 2019-119703 Publication Japanese Patent Application Publication No. 2001-97841

Conventional multilayer cosmetics have had the problem of not spreading sufficiently and being difficult to absorb into the skin when spread over a wide area of the body.
In addition, multilayer cosmetics are required to maintain a uniformly dispersed state for a certain period of time and completely separate into multiple layers in the same state as before use, but after shaking, the oil layer and water layer are separated. It did not separate easily and remained cloudy for a long time, and there were also aesthetic issues.

The present inventor has discovered that by using liquid hydrocarbon oil and liquid triglyceride oil in combination with a specific amount of polyol and a pH adjuster, a uniform dispersion state can be obtained easily when shaken, and the interface between each layer when left still. It has been found that a multilayer liquid cosmetic can be obtained that clearly separates the skin, has excellent aesthetics, is easy to spread when applied, is quickly absorbed into the skin, does not leave the skin sticky after application, and has an excellent moisturizing feeling on the skin.

The present invention provides the following components (A) to (E):
(A) a hydrocarbon oil that is liquid at 25°C;
(B) triglyceride oil liquid at 25°C;
(C) polyol,
(D) pH adjuster,
(E) contains water;
The present invention relates to a multilayer liquid cosmetic in which the proportion of component (C) in the aqueous layer is 25% by mass or more.

The multilayer liquid cosmetic of the present invention easily becomes a uniformly dispersed state when shaken, and the interfaces between the layers are clearly separated when left to stand, resulting in excellent aesthetics. In addition, it is easy to spread when applied, absorbs quickly into the skin, does not leave the skin sticky after application, and has an excellent moisturizing effect on the skin.

Component (A) used in the present invention is a hydrocarbon oil that is liquid at 25°C.
Liquid means fluid, and includes paste.
Examples of the hydrocarbon oil of component (A) include squalane, liquid paraffin, liquid isoparaffin, light liquid isoparaffin, and heavy liquid isoparaffin.
Ingredient (A) is one or more selected from squalane, liquid paraffin, liquid isoparaffin, and light liquid isoparaffin, from the viewpoint of improving the ease of spreading during application and reducing the stickiness of the skin after application. It is preferable to contain one or more selected from squalane, liquid paraffin, and liquid isoparaffin, and it is even more preferable to contain one or more selected from squalane and liquid isoparaffin. is even more preferred.

Component (A) can be used alone or in combination of two or more, and the content is determined from the viewpoint of improving the ease of spreading during application and reducing the stickiness of the skin after application. It is preferably 4 to 40% by weight, more preferably 10 to 30% by weight, even more preferably 17 to 25% by weight, even more preferably 19 to 23% by weight.

Component (B) is a triglyceride oil that is liquid at 25°C.
Liquid means fluid, and includes paste.
Component (B) includes, for example, tri(caprylic/capric) glycerin, tri-2-ethylhexanoic acid glycerin, trimyristate glycerin, triisopalmitic acid glycerin, trioleic acid glycerin, triisostearic acid glycerin, tri(palmitic acid) glycerin. Glyceryl acid/stearic acid, glyceryl tri(oleic acid/linoleic acid); olive oil, jojoba oil, macadamia nut oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, kyonin oil, rice germ oil , rice bran oil, evening primrose oil, and other vegetable oils.

Component (B) includes at least (b1) a triglyceride that is liquid at 25°C containing an alkyl chain having 10 or less carbon atoms, and (b2) a triglyceride that is liquid at 25°C containing an alkyl chain having more than 10 carbon atoms. preferable.
Component (b1) includes tri(caprylic/capric acid) glycerin, tri-2-ethylhexanoic acid glycerin, and the like.
Ingredient (b1) is tri(caprylic/capric acid) from the viewpoint of improving the ease of spreading during application, improving the speed of absorption into the skin during application, and reducing the stickiness of the skin after application. ) Glycerin is preferred.
Component (b1) can be used alone or in combination of two or more, and the content is determined to improve the ease of spreading when applied, improve the speed of absorption into the skin when applied, From the viewpoint of reducing stickiness on the skin after application, it is preferably 1 to 20% by mass in the total composition, more preferably 4 to 15% by mass, even more preferably 4.5 to 10.7% by mass, and 5% by mass. .2 to 7.3% by mass is even more preferred.

Component (b2) includes glyceryl trimyristate, glyceryl triisopalmitate, glyceryl trioleate, glyceryl triisostearate, glyceryl tri(palmitic acid/stearic acid), glyceryl tri(oleic acid/linoleic acid); olive oil; Examples include vegetable oils such as jojoba oil, macadamia nut oil, soybean oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, kyonin oil, rice germ oil, rice bran oil, and evening primrose oil.
Ingredient (b2) is one or more selected from olive oil, macadamia nut oil, and soybean oil, from the viewpoint of improving the ease of spreading during application and improving the speed of absorption into the skin during application. , more preferably one or more selected from olive oil and macadamia nut oil, and even more preferably macadamia nut oil.
Component (b2) can be used alone or in combination of two or more, and the content is determined to improve the ease of spreading when applied, improve the speed of absorption into the skin when applied, From the viewpoint of improving the appropriate massage feeling during application, it is preferably 0.5 to 10% by mass in the total composition, more preferably 1 to 5% by mass, and even more preferably 2.3 to 3.2% by mass. preferable.

When components (b1) and (b2) are used in combination as component (B), the mass ratio (b1)/(b2) of component (b1) to component (b2) is such that the interface between each layer is clear when left still. It separates into two parts, improves aesthetics, makes it easier to spread when applied, improves how quickly it absorbs into the skin when applied, reduces stickiness on the skin after application, and improves the appearance of the skin after application. From the viewpoint of improving moisturizing feeling, it is preferably 0.5 to 10, more preferably 1 to 4, and even more preferably 1.5 to 3.

In addition, in the present invention, the mass ratio (b2)/[(A)+(b1)] of component (b2) to the total amount of component (A) and component (b1) is such that the interface between each layer is clear when left standing. Separates, improves aesthetics, improves the ease of spreading when applied, improves how quickly it blends into the skin when applied, reduces stickiness on the skin after application, and moisturizes the skin after application. From the viewpoint of improving texture and stability during low-temperature storage, it is preferably 0.03 to 0.4, more preferably 0.05 to 0.2, and even more preferably 0.08 to 0.15. preferable.

Component (B) can be used alone or in combination of two or more, and the content is determined to improve the ease of spreading when applied, improve the speed of absorption into the skin when applied, From the viewpoint of reducing the stickiness of the skin after application and improving the appropriate massage feeling during application, it is preferably 2 to 24% by mass in the total composition, more preferably 4 to 17% by mass, and 5 to 13% by mass. .3% by mass is more preferred, and 7-11% by mass is even more preferred.

In the present invention, the mass ratio (A)/(B) of component (A) to component (B) is such that the interface between each layer is clearly separated when left to stand, improving aesthetics and making it easier to spread when applied. 0.5 to 5 is preferable, from the viewpoint of improving the speed of absorption into the skin during application, reducing stickiness of the skin after application, and improving the moisturizing feeling of the skin after application. .7 to 3 is more preferable, and 1.9 to 2.5 is even more preferable.

The polyol of component (C) is a compound having two or more hydroxyl groups in the molecule, and any polyol used in ordinary cosmetics may be used.
Examples of dihydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,3-butylene glycol, 1,3-propanediol, and pentanediol. etc. Examples of the trihydric alcohol include glycerin and trimethylolpropane. Examples of the tetrahydric alcohol include diglycerin and erythritol. Examples of polyhydric alcohols having a valence of 5 or more include polyglycerols such as triglycerin; glucose, maltose, maltose, sucrose, xylitol, sorbitol, marbitol, polyoxyethylene methyl glucoside, polyoxyethylene ethyl glucoside, polyoxyethylene propylene glucoside, etc. saccharides and sugar alcohols.

The polyol of component (C) clearly separates the interface between each layer when left to stand, improving aesthetics, improving dispersibility to achieve a uniform dispersion state when shaken, and forming a multilayer layer when left to stand after shaking. From the viewpoint of improving the speed of separation of , diglycerin, and erythritol, and preferably contains one or more selected from ethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,3-propanediol, glycerin, and diglycerin. It is more preferable to include one or more types selected from ethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,3-propanediol, and glycerin. It is even more preferable to contain one or more selected from dipropylene glycol, 1,3-butylene glycol, 1,3-propanediol and glycerin, and even more preferably to contain glycerin.

Component (C) can be used alone or in combination of two or more, and the content is such that the interface between each layer is clearly separated when left still, improves aesthetics, and blends well with the skin when applied. It improves the speed of application, reduces stickiness on the skin after application, improves the moisturizing feeling of the skin after application, improves dispersibility to achieve a uniform dispersion state when shaken, and multi-layered when left standing after shaking. From the viewpoint of improving the speed of separation into is even more preferred.

In the present invention, the proportion of component (C) in the aqueous layer is determined so that the interface between each layer is clearly separated when standing still, improving aesthetics, improving dispersibility to achieve a uniform dispersion state when shaken, and improving dispersibility after shaking. From the viewpoint of improving the uniformity of the oil layer when left standing, the amount is 25% by mass or more, preferably 25 to 60% by mass, more preferably 28 to 55% by mass, and even more preferably 35 to 45% by mass.

The pH adjuster of component (D) may be any one used in ordinary cosmetics, preferably inorganic acids and salts thereof, organic acids having 6 or less carbon atoms and salts thereof, and pH adjusters having 6 or less carbon atoms. Organic acids and their salts are more preferred.
The inorganic acid preferably includes one or more selected from, for example, hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid, phosphonic acid, phosphinic acid, and salts thereof. More preferably, it contains one or more salts selected from salts.
Furthermore, as the organic acids having 6 or less carbon atoms and their salts, water-soluble organic acids and their salts are preferable, such as fatty acids having 1 to 6 carbon atoms, hydroxy acids, dicarboxylic acids, acidic amino acids, and salts thereof. etc. Among these, it is preferable to include one or more selected from malic acid, lactic acid, citric acid, succinic acid, acetic acid, tartaric acid, glutamic acid, aspartic acid, adipic acid, and salts thereof; malic acid, lactic acid, It is more preferable to contain one or more selected from citric acid, succinic acid, and salts thereof, and even more preferable to contain one or more selected from citric acid and salts thereof.
The pH adjuster of component (D) preferably contains an acid and a salt thereof at the same time, and when it contains an acid and a salt thereof, the mass ratio of the acid content to the salt content (acid)/( Salt) is preferably 1 to 5, more preferably 1 to 3, even more preferably 1 to 2, and even more preferably 1 to 1.5.

Component (D) can be used alone or in combination of two or more, and the content is set to 0 in the entire composition from the viewpoint of clearly separating the interfaces of each layer when left still and improving aesthetics. It is preferably 0.015 to 0.12% by weight, more preferably 0.02 to 0.09% by weight, and even more preferably 0.05 to 0.08% by weight.

The content of water in component (E) is preferably 10 to 60% by mass in the total composition, more preferably 30 to 50% by mass, from the viewpoint of improving dispersibility to obtain a uniformly dispersed state during shaking. , 38 to 45% by mass is more preferred.

In addition to the above-mentioned ingredients, the multilayer liquid cosmetic of the present invention includes ingredients used in ordinary cosmetics, such as oily ingredients other than the above-mentioned ingredients, surfactants, humectants other than polyols, ultraviolet absorbers, ultraviolet scattering agents, It can contain thickeners, sequestering agents, antioxidants, antibacterial agents, preservatives, antiperspirants, drugs, powders, colorants, fragrances, animal and plant extracts, and the like. Note that these ingredients are not limited to their use as individual agents, but can also be used for other purposes depending on the purpose, such as being used as a fragrance in an antiperspirant, or being used in combination with other purposes, such as as an antiperspirant. It can also be used as a fragrance.

The multilayer liquid cosmetic of the present invention can be manufactured by appropriately mixing predetermined components. For example, all oily components are mixed to prepare an oil layer, and all aqueous components are mixed to prepare a water layer. , can be produced by mixing the oil layer and the water layer at a predetermined ratio.

In the multilayer liquid cosmetic of the present invention, the interface between each layer is clearly separated when left still, and from the viewpoint of improving aesthetics, the mass ratio of the total oil layer component to the total water layer component (oil layer)/(water layer) is as follows: It is preferably from 0.1 to 1, more preferably from 0.2 to 0.7, even more preferably from 0.35 to 0.55.

The multilayer liquid cosmetic of the present invention clearly separates the interfaces of each layer when left to stand, improving aesthetics, improving dispersibility to achieve a uniform dispersion state when shaken, and reducing the oil layer when left to stand after shaking. From the viewpoint of improving uniformity, the pH of the aqueous layer is preferably 5 or less, more preferably 3 to 5, even more preferably 4 to 5, and even more preferably 4.5 to 5.
In the present invention, pH refers to the pH of only the aqueous layer, and is measured as it is without diluting the aqueous layer at 25° C. using a pH meter.

In the multilayer liquid cosmetic of the present invention, each layer is preferably transparent when left still.
Transparent means that when a multilayer liquid cosmetic is placed in a transparent glass container and letters are placed on the back, the letters are clearly visible when observed from the front.

Further, the multilayer liquid cosmetic of the present invention is in liquid form, and when left still, the viscosity at 25°C in any layer is preferably 1 mPa·s or more, more preferably 3 mPa·s or more. It is preferably 5 mPa·s or more, more preferably 500 mPa·s or less, more preferably 300 mPa·s or less, and even more preferably 100 mPa·s or less.
In the present invention, the viscosity is measured using a B-type viscometer (Bismetron viscometer: Model VS-A1 (manufactured by Shibaura System), rotor No. 1, 30 revolutions/minute, 30 seconds).

The multilayer liquid cosmetic of the present invention has an oil layer containing at least components (A) and (B) and an aqueous layer containing at least components (C), (D) and (E), which are incompatible with each other when left still. It is a cosmetic that maintains a multi-layer separated state of two or more layers, and can be made into a uniformly dispersed state by shaking at the time of use, and gradually returns to the original multi-layer separated state. Examples include two-layer cosmetics consisting of an oil layer and a water layer, and three-layer cosmetics consisting of an oil layer, an oil layer and a water layer.

The multilayer liquid cosmetic of the present invention has at least an oil layer and a water layer, but in this case, when left still, the oil layer exists on the opening side (upper side) of the container and the water layer exists on the bottom side (lower side) of the container. It becomes like being.

The multilayer liquid cosmetic of the present invention has excellent aesthetic appearance, does not leave the skin sticky after application, and has an excellent moisturizing feeling, so it can be used for heat retention, anti-aging, whitening, packs, massage, sunscreen, makeup base, and foundation. , lip balm, cleansing agent, etc., can be applied to the skin, preferably to the skin excluding the scalp, more preferably to the face, body, limbs, etc., and is suitable as a skin cosmetic.
In particular, it is suitable as a massage cosmetic, and is more suitable as a body massage cosmetic from the viewpoint of being easy to spread and quickly blending into the skin upon application.

Examples 1-9, Comparative Examples 1-2
A two-layer liquid cosmetic (body oil composition) with the composition shown in Table 1 was manufactured, and the pH of the aqueous layer was measured, and the ease of spreading during application, how quickly it absorbed into the skin during application, and after application. The non-stickiness of the skin, the moisturizing feeling of the skin after application, and the aesthetics were evaluated. The results are also shown in Table 1. In addition, in each of the two-layer liquid cosmetics of Examples and Comparative Examples, when separated into two layers, both the oil layer and the water layer had a transparent appearance.

(Production method)
An oil layer was prepared by mixing oil components including components (A) and (B), and an aqueous layer was prepared by mixing an aqueous component including components (C), (D), and (E). A two-layer liquid cosmetic was produced by mixing the oil layer and the water layer.

(Evaluation method)
(1) pH:
Using a pH meter (Horiba Handy Model D71), an electrode was placed in the aqueous layer at 25° C., and the pH was measured after standing for 30 seconds.

(2) Ease of spreading when applying, how quickly it blends into the skin when applying, lack of stickiness on the skin after application, moisturizing feeling on the skin after application:
Three evaluators first applied 0.5 g of each two-layer liquid cosmetic to one arm from the wrist to the upper arm/shoulder with one hand, then applied it to one leg from the toes to the knee, and from above the knee. 0.5 g of each was applied to each part up to the base of the thigh. At that time, the following criteria were used to evaluate ease of spreading during application, speed of absorption into the skin during application, non-stickiness of the skin after application, and moisturizing feeling of the skin after application. The results were shown as the total score of three evaluators.
In addition, the speed at which the two-layer liquid cosmetic spreads on the skin means that it can be spread lightly at the beginning of application, but as the application time increases, a feeling of resistance is felt on the hand that is being stretched, and the feeling of close contact between the skin and the hand on which it is applied increases.

(2-1) Ease of spreading during application:
4: Easy to spread.
3: Slightly easy to spread.
2: Slightly difficult to spread.
1: Difficult to spread.

(2-2) How quickly it blends into the skin when applied:
4: Quickly blends into the skin.
3: Blends into the skin a little quickly.
2: Slightly slow blending into the skin.
1: The fit is slow.

(2-3) No stickiness on the skin after application:
4: Not sticky.
3: Hardly sticky.
2: Slightly sticky.
1: Sticky.

(2-4) Moisturizing feeling on the skin after application:
4: Feels moisturizing.
3: Slightly moisturizing feeling.
2: Slightly lacking in moisturizing feeling.
1: No moisturizing feeling.

(3) Aesthetics:
Put 10g of each two-layer liquid cosmetic into a container (Mighty Vial No. 4, manufactured by Maruel), hold the container with one hand, shake it up and down 10 times to mix, then let it stand.How long does it take to separate? This was visually evaluated. Note that the separated water layer and oil layer are both clearly transparent when visually observed. Moreover, the time until separation is shown in units of 10 seconds. Separation is preferably performed in 1 minute 30 seconds to 5 minutes, more preferably 2 minutes to 3 minutes, and even more preferably 2 minutes 10 seconds to 2 minutes 50 seconds.

Prescription examples 1 to 4
Two-layer liquid cosmetics having the compositions shown in Table 2 were produced in the same manner as in Examples 1 to 9.
All of the two-layer liquid cosmetics in Formulation Examples 1 to 4 have excellent transparency, easily become uniformly dispersed when shaken, and the interfaces between each layer are clearly separated when left to stand, giving them excellent aesthetics. In addition, it is easy to spread when applied, quickly blends into the skin, does not leave the skin sticky after application, and has an excellent moisturizing effect on the skin.

Claims (5)

The following ingredients (A) to (E):
(A) a hydrocarbon oil that is liquid at 25°C;
(B) triglyceride oil liquid at 25°C;
(C) polyol,
(D) pH adjuster,
(E) contains water;
A multilayer liquid cosmetic in which the proportion of component (C) in the aqueous layer is 25% by mass or more. The multilayer liquid cosmetic according to claim 1, wherein the mass ratio of the oil layer to the water layer (oil layer)/(water layer) is 0.1 to 1. The multilayer liquid cosmetic according to claim 1 or 2, wherein the aqueous layer has a pH of 5 or less. The multilayer liquid cosmetic according to any one of claims 1 to 3, wherein component (D) contains one or more selected from inorganic acids and salts thereof, organic acids having 6 or less carbon atoms, and salts thereof. Component (B) comprises at least (b1) a triglyceride that is liquid at 25°C containing an alkyl chain having 10 or less carbon atoms, and (b2) a triglyceride that is liquid at 25°C containing an alkyl chain having more than 10 carbon atoms. 5. The multilayer liquid cosmetic according to any one of 1 to 4.