JP7843627B2 - Lip aerosol cosmetic - Google Patents

Description

This invention relates to an aerosol cosmetic for the lips.

Compared to the skin, the lips lack a sebum film, have a thin stratum corneum, and are prone to dryness. Therefore, the most common lip-related concerns are dryness, chapping, and peeling, followed by concerns about color and shape, which increase especially with age.
On the other hand, skin problems such as dark circles and dullness are thought to be caused by poor blood circulation, and cosmetics that utilize the effects of carbon dioxide are being considered to improve these conditions.
For example, Patent Document 1 describes an aerosol cosmetic containing dimethylpolysiloxane, polyethylene glycol, a water-soluble thickener, a nonionic surfactant, and carbon dioxide, which allows a sufficient amount of carbon dioxide to act on the skin, resulting in a non-sticky feel after application and excellent usability. Patent Document 2 also describes an aerosol cosmetic containing two specific surfactants, an acrylic acid polymer, a polyol, and carbon dioxide, which generates many fine bubbles, promoting transdermal absorption of carbon dioxide into the skin, resulting in a non-sticky feel after application and excellent usability.

Japanese Patent Publication No. 2020-2126 Japanese Patent Publication No. 2016-17052

However, when conventional carbon dioxide-containing aerosol cosmetics were applied to the lips to improve lip problems, there was a problem: a bitter taste was experienced when it got into the mouth.

The inventors have discovered that certain polyols, used in aerosol cosmetics for their preservative properties and feel, are the cause of bitterness. Previously, the taste of polyols was unknown. Furthermore, the inventors have found that by using a combination of two or more specific dihydric alcohols, it is possible to reduce the bitterness upon ingestion without compromising preservative properties, resulting in an aerosol cosmetic for the lips that improves redness and dryness.

The present invention comprises the following components (A), (B), (C), and (D):
(A) Two or more dihydric alcohols with a molecular weight of less than 115, totaling 3 to 20% by mass.
(B) Surfactants,
(C) Water-soluble thickener,
(D) A stock solution containing water, and (E) an aerosol cosmetic for lips containing carbon dioxide.

The lip aerosol cosmetic of the present invention has preservative properties, reduces bitterness when ingested, causes less irritation around the mouth, and can improve redness and dryness of the lips.

The component (A) used in this invention is a dihydric alcohol with a molecular weight of less than 115.
Component (A) is one that is commonly used in cosmetics, and examples include 1,2-propanediol (molecular weight 76.09), 1,3-propanediol (molecular weight 76.09), 1,3-butylene glycol (molecular weight 90.1), 1,2-pentanediol (molecular weight 104.15), methylpropanediol (molecular weight 90.12), isopentyldiol (molecular weight 104), and the like.
Of these, 1,2-propanediol, 1,3-propanediol, 1,3-butylene glycol, and 1,2-pentanediol are preferred from the viewpoint of improving preservative properties, improving the feeling of dryness on the lips after application, and reducing the bitterness when ingested.

Component (A) is used in combination of two or more types. From the viewpoint of reducing bitterness when ingested and improving preservative properties, the content of each of the two or more components in the undiluted solution is preferably 10% by mass or less, more preferably 1 to 9% by mass, and even more preferably 2 to 8% by mass.
Furthermore, the total content of component (A) is preferably 3% by mass or more, more preferably 3.5% by mass or more, more preferably 4% by mass or more, 20% by mass or less, more preferably 18% by mass or less, and even more preferably 16% by mass or less, from the viewpoint of improving preservative properties, reducing bitterness and irritation to the mouth when ingested, and improving redness and dryness of the lips after application.

The surfactant component (B) used in this invention is one that is commonly used in cosmetics, and includes nonionic surfactants, anionic surfactants, amphoteric surfactants, and the like.
As the surfactant of component (B), a nonionic surfactant is preferred, and an HLB of 2 to 18 is more preferred.
Here, HLB (Hydrophilic-Lipophilic Balance) represents the molecular weight of the hydrophilic group portion of the total molecular weight of the surfactant, and for nonionic surfactants, it is determined by Griffin's formula.
The HLB of a mixed surfactant composed of two or more nonionic surfactants is determined as follows: The HLB of the mixed surfactant is obtained by averaging the HLB values of each nonionic surfactant based on their respective blending ratios.

Mixed HLB=Σ(HLBx×Wx)/ΣWx
HLBx indicates the HLB value of the nonionic surfactant X.
Wx represents the mass (g) of the nonionic surfactant X having an HLBx value.

Examples of nonionic surfactants include polyglycerin fatty acid esters, polyethylene glycol fatty acid esters, sucrose fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene propylene glycol fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene phytostanol ethers, polyoxyethylene phytosterose ethers, polyoxyethylene cholestanol ethers, polyoxyethylene cholesteryl ethers, polyoxyalkylene-modified organopolysiloxanes, and polyoxyalkylene-alkyl copolymerized organopolysiloxanes.
Of these, polyoxyethylene hydrogenated castor oil and polyoxyethylene methylpolysiloxane copolymer are preferred from the viewpoint of improving lip redness by generating many fine bubbles, reducing bitterness when ingested, being less likely to drip during application, and preventing bubbles from entering the mouth.

Component (B) can be used alone or in combination of two or more types. From the viewpoint of improving lip redness by generating many fine bubbles, reducing bitterness when ingested, preventing dripping during application, and preventing bubbles from entering the mouth, the content of component (B) in the undiluted solution is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.5% by mass or more, preferably 3.5% by mass or less, more preferably 2.5% by mass or less, and even more preferably 1.5% by mass or less. Furthermore, the content of component (B) in the undiluted solution is preferably 0.1 to 3.5% by mass, more preferably 0.2 to 2.5% by mass, and even more preferably 0.5 to 1.5% by mass.

The water-soluble thickener for component (C) can be any one commonly used in cosmetics, such as carrageenan, dextrin, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, carboxyvinyl polymer, (acrylic acid/alkyl acrylate (C10-30)) copolymer, xanthan gum, carboxymethyl chitin, chitosan, etc.
Of these, acrylic acid polymers and xanthan gum are preferred from the viewpoint of reducing bitterness when ingested, ensuring sustained foam production, preventing dripping during application, and minimizing foam entry into the mouth.
As acrylic acid-based polymers, carboxyvinyl polymers and acrylic acid/alkyl acrylate copolymers are more preferred, and (acrylic acid/alkyl acrylate (C10-30)) copolymers are even more preferred.
Here, the (acrylic acid/alkyl acrylate (C10-30)) copolymer is a copolymer of C10-30 alkyl acrylic acid and acrylic acid, methacrylic acid, or a lower alkyl ester thereof, crosslinked with sucrose allyl ether or pentaerythritol allyl ether. Commercial products such as Pemlen TR-1, Pemlen TR-2, Carbopol ETD2020, Carbopol 1342, and Carbopol 1382 (all from Lubrizol Advanced Materials) can be used.

Furthermore, acid-type water-soluble thickeners such as polyacrylic acid, carboxyvinyl polymer, and (acrylic acid/alkyl acrylate (C10-30)) copolymer are preferably used as water-soluble or water-dispersible salts, with alkali metal hydroxides such as potassium hydroxide and sodium hydroxide used as neutralizing agents.

Component (C) can be one or more types. From the viewpoint of reducing bitterness when ingested, ensuring sustained foam production, preventing dripping during application, and minimizing foam entry into the mouth, the content is preferably 0.1% by mass or more, more preferably 0.15% by mass or more, even more preferably 0.2% by mass or more, preferably 2% by mass or less, more preferably 1.4% by mass or less, and even more preferably 0.8% by mass or less. Furthermore, the content of component (C) in the undiluted solution is preferably 0.1 to 2% by mass, more preferably 0.15 to 1.4% by mass, and even more preferably 0.2 to 0.8% by mass.

The water component (D) used in this invention acts as a solvent in the stock solution and constitutes the remainder of the other components. From the viewpoint of improving lip redness and keeping the mouth area moist after application, the water content of component (D) is preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 74% by mass or more, preferably 96.5% by mass or less, more preferably 90% by mass or less, and even more preferably 86% by mass or less. Furthermore, the water content of component (D) is preferably 60 to 96.5% by mass in the stock solution, more preferably 70 to 90% by mass, and even more preferably 74 to 86% by mass.

Furthermore, in this invention, the mass ratio (A)/(D) of component (A) to component (D) is preferably 0.03 to 0.35, more preferably 0.04 to 0.3, and even more preferably 0.05 to 0.24, from the viewpoint of having preservative properties, reducing bitterness when ingested, minimizing irritation around the mouth, and improving redness and dryness of the lips.

The lip aerosol cosmetic of the present invention may further contain an oily agent that is liquid at (F) 25°C in the undiluted solution in order to improve the feeling of dryness of the lips after application and to provide a suitable feeling of adhesion to the mouth after application.
Here, "liquid" refers to having fluidity, and includes paste-like substances.
The oils in component (F) are those commonly used in cosmetics, such as hydrocarbons like paraffin, squalane, and squalene; natural animal and vegetable oils mainly composed of triglycerides such as camellia oil, jojoba oil, olive oil, macadamia nut oil, avocado oil, and olive oil; glycerin monostearate, glycerin distearate, glycerin monooleate, isopropyl palmitate, isopropyl stearate, butyl stearate, isopropyl myristate, diethyl phthalate, myristyl lactate, cetyl myristate, cetyl lactate, cetyl 2-ethylhexanoate, ethylhexyl palmitate, octyldodecyl myristate, octyldodecyl oleate, glycerol triisostearate, glyceryl mono-2-ethylhexanoate, iso Examples include monoester oils such as isotridecyl nonanoate, glyceryl monomyristate monoisostearate, and alkyl benzoate (alkyl groups with 12 to 15 carbon atoms); diester oils such as diisopropyl adipate, diisobutyl adipate, neopentyl glycol dicaprate, caprylic/capric triglyceride, glycerin tricaprate, neopentyl glycol di-2-ethylhexanoate, dicaprylic/capric propanediol, 1-isostearoyl-3-myristoylglycerol, diisostearyl malate, and di(cholesteryl/octyldodecyl) N-lauroyl-L-glutamate; ether oils such as alkyl-1,3-dimethylbutyl ether, dicaprylyl ether, and dicaprylyl ether; silicone oils such as dimethylpolysiloxane; and essential oils such as eucalyptus oil and peppermint oil.

As for the oil component (F), it is preferable that it includes one with a viscosity of 500 to 50,000 mPa·s at 25°C, from the viewpoint of improving the feeling of dryness on the lips after application and providing a moderate feeling of adhesion to the lips after application.
Here, viscosity is measured by the viscosity measurement method, Method 2, rotational viscometer method, etc., as specified in the General Test Methods of the External Standards.

Component (F) can be used alone or in combination of two or more types. From the viewpoint of providing a moderate level of adhesion to the lips after application and improving the feeling of dryness on the lips after application, its content is preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 1.5% by mass or more, preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 15% by mass or less. Furthermore, the content of component (F) in the undiluted solution is preferably 0.5 to 20% by mass, more preferably 1 to 18% by mass, and even more preferably 1.5 to 15% by mass.

The lip aerosol cosmetic of the present invention may further contain (G) a dihydric alcohol with a molecular weight of 115 to 190 in the undiluted solution in order to improve preservative properties and reduce the feeling of dryness on the lips after application.
The dihydric alcohol of component (G) is one commonly used in cosmetics, such as dipropylene glycol (molecular weight 134.17), 1,2-hexanediol (molecular weight 118.17), and 1,2-octanediol (molecular weight 146.13).

Component (G) can be used alone or in combination of two or more. From the viewpoint of reducing bitterness when ingested, its content is preferably 3% by mass or less in the undiluted solution, more preferably 2% by mass or less, and even more preferably not present.

The lip aerosol cosmetic composition of the present invention may contain (H) parabens (para-hydroxybenzoic acid esters) to improve preservative properties. The content of component (H) is preferably 0.3% by mass or less, and more preferably 0.1% by mass or less, in the undiluted solution, considering the balance between improving preservative properties and reducing irritation to the mouth. Furthermore, from the viewpoint of reducing irritation, it is preferable not to include it.
Examples of parabens include methylparaben and ethylparaben.

In the lip aerosol cosmetic of the present invention, the undiluted solution may further contain ingredients commonly used in cosmetics, such as polyhydric alcohols other than those mentioned above, oily components other than those mentioned above, preservatives, antioxidants, pigments, pH adjusters, fragrances, UV absorbers, moisturizers, blood circulation promoters, cooling agents, antiperspirants, bactericides, whitening agents, anti-inflammatory agents, skin activators, and the like.

In the lip aerosol cosmetic composition of the present invention, the stock solution is prepared by mixing the above components (A) to (D) and other components. From the viewpoint of emulsification stability and foam discharge properties of the stock solution, the viscosity at 25°C is preferably 1500 to 12000 mPa·s, preferably 2000 to 9000 mPa·s, and more preferably 2500 to 7500 mPa·s.
Here, viscosity was measured using a BM viscometer (manufactured by Toki Sangyo Co., Ltd.) at rotor No. 3, 12 rpm, and 1 minute. If the viscosity exceeded 10,000 mPa·s, the value measured at rotor No. 3, 6 rpm, and 1 minute was used.

The lip aerosol cosmetic of the present invention can be manufactured by conventional methods by filling a pressure-resistant container with the stock solution described above and (E) carbon dioxide. The preferred form of spraying is a foam type, where the product is dispensed as a foam.
From the viewpoint of the solubility of carbon dioxide in the stock solution and the generation of bubbles, the mass ratio of the stock solution to carbon dioxide is preferably 94:6 to 99.5:0.5, more preferably 95:5 to 99:1, and even more preferably 96.5:3.5 to 98.5:1.5.

The lip aerosol cosmetic of the present invention may contain a propellant commonly used in aerosol cosmetics, in addition to carbon dioxide (component E). Examples of propellants include liquefied petroleum gas and compressed gas. When a propellant other than carbon dioxide is included, the carbon dioxide content relative to the total amount of carbon dioxide and propellant is preferably 90% by mass or more, more preferably 95% by mass or more, and even more preferably 98% by mass or more.

The lip aerosol cosmetic of the present invention is applied to the lips, and the carbon dioxide is absorbed transdermally, resulting in a significant blood circulation-promoting effect. This can improve lip color (redness, dullness, etc.) and alleviate dryness. It is suitable as a lip color improving agent.
Furthermore, the lip aerosol cosmetic of the present invention, when applied to the lips and left for a certain period of time, forms a kind of coating film containing air bubbles, thereby enhancing the effect of promoting blood circulation.

Examples 1-10 and Comparative Examples 1-4
Lip aerosol cosmetics with the composition shown in Table 1 were manufactured and evaluated as described below. The results are also shown in Table 1.

(Manufacturing method)
Step 1: Mix components (C), (D) and the base component and make them homogenized at a temperature of 60-70°C.
Step 2: Add components (A), (B), (F), (G), (H), and other components to the liquid obtained in Step 1, and stir until homogenized.
Step 3: Cool the liquid obtained in Step 2 to 15-30°C.
Step 4: The liquid (undiluted solution) obtained in Step 3 was filled into a pressure-resistant container, sealed, and then filled with component (E) under pressure to obtain an aerosol cosmetic for lips.

(Evaluation method)
(1) Stock solution viscosity:
The stock solution obtained in step 3 was filled into a 50 mL glass container at a rate of 50 g and measured using a BM viscometer (manufactured by Toki Sangyo Co., Ltd.) (rotor No. 3, 12 rpm, 1 min).

(2) Ten expert panelists applied each lip aerosol cosmetic to their upper and lower lips, dispensing a 1 cm diameter sample. They evaluated the bitterness and irritation upon application, the improvement in lip redness before and after using the cosmetic once daily for two weeks, and the improvement in lip dryness according to the following criteria. The results are shown in the total scores of the ten panelists.

(2-1) Lack of bitterness when it enters the mouth:
The bitterness when the product gets into the mouth during application was evaluated according to the following criteria.
4. I don't taste any bitterness.
3. I hardly taste any bitterness.
2. I can taste a slight bitterness.
1. I taste bitterness.

(2-2) Reduced sensitivity to irritation around the mouth (lips and surrounding area):
The irritation around the mouth during application was evaluated according to the following criteria.
4. No irritation is felt around the mouth.
3. I feel almost no irritation around my mouth.
2. I feel a slight tingling sensation around my mouth.
1. I feel a tingling sensation around my mouth.

(2-3) Improvement of lip redness:
The change in lip redness before and after two weeks of continuous use was evaluated visually according to the following criteria.
4. The redness of the lips increased.
3. The redness of the lips has increased slightly.
2. The redness of the lips hardly changed.
1. There was no change in lip redness, or the redness decreased.

(2-4) Improvement of dryness of the lips:
The change in lip dryness before and after two weeks of continuous use was evaluated based on the subject's subjective experience, according to the following criteria.
4. The dryness of my lips improved.
3. The dryness of my lips improved slightly.
2. The dryness of my lips hardly changed.
1. There was no change in the dryness of the lips, or the dryness worsened.

(3) Preservative properties:
The test was conducted in accordance with the preservative efficacy test method, Category IB, as described in the 18th edition of the Japanese Pharmacopoeia.
The determination was based on whether the bacterial count decreased by 2.0 log or more 14 days after inoculation compared to the inoculated count, and whether it increased after 28 days from the count at 14 days. In this case, the product was deemed to have antiseptic properties (○), while an increase in bacterial count indicated no antiseptic properties (×).

*1: Emanon CH60K, manufactured by Kao Corporation: HLB14,
*2: SH3775M, manufactured by Toray Dow Corning: HLB5,
*3: PEMULEN TR-1, manufactured by Lubrizol Advanced Materials, Inc.
*4: Keldent, manufactured by DSP Gokyo Food & Chemical Co., Ltd.

Claims (6)

The following components (A), (B), (C) , (D) , and (H) :
(A) Two or more dihydric alcohols selected from 1,3-butylene glycol, 1,3-propanediol, 1,2-propanediol, and 1,2-pentanediol , in an amount of 2 to 8% by mass per alcohol and a total of 3.5 to 18% by mass for the two or more alcohols .
(B) Surfactants,
(C) Water-soluble thickener,
(D) water;
(H) Parabens 0-0.3% by mass
A stock solution containing (E) carbon dioxide, and an aerosol cosmetic for lips containing (E). The lip aerosol cosmetic composition according to claim 1, wherein the mass ratio (A)/(D) of component (A) to component (D) is 0.03 to 0.35. The lip aerosol cosmetic composition according to claim 1 or 2 , wherein the undiluted solution further contains an oil that is liquid at (F) 25°C. The lip aerosol cosmetic composition according to any one of claims 1 to 3 , wherein the undiluted solution further contains 0.5 to 20% by mass of an oil agent with (F) 500 to 50,000 mPa·s. The lip aerosol cosmetic according to any one of claims 1 to 4 , wherein the stock solution further contains (G) a dihydric alcohol with a molecular weight of 115 or more and 190 or less. The following components (A), (B), (C) , (D) , and (H) :
(A) Two or more dihydric alcohols selected from 1,3-butylene glycol, 1,3-propanediol, 1,2-propanediol, and 1,2-pentanediol , in an amount of 2 to 8% by mass per alcohol and a total of 3.5 to 18% by mass for the two or more alcohols .
(B) Surfactants,
(C) Water-soluble thickener,
(D) water;
(H) Parabens 0-0.3% by mass
A stock solution containing (E) carbon dioxide, and a lip color improving agent containing (E) carbon dioxide.