JP2020083788A - Composition for forming film and pack cosmetic - Google Patents

Abstract

To provide a composition for forming a film which has excellent application properties, can form a film having high strength and can be peeled off after forming a film and to provide a pack cosmetic containing the composition for forming a film.SOLUTION: There is provided a composition for forming a film comprising a rubber component which has a viscosity of 2000 mPa s or more and 50000 mPa s, where the content ratio of the rubber component is more than 10 mass% and less than 50 mass%. There is provided a composition for forming a film which has excellent application properties, can form a film having high strength and can be peeled off after forming a film.SELECTED DRAWING: None

Description

The present invention relates to a film-forming composition and a pack cosmetic.

The film-forming material is a material capable of forming a coating film by applying or coating, and includes, for example, pack cosmetics such as face packs, paints such as body paints, adhesives, pressure-sensitive adhesives and coatings. It is used for various purposes such as agents.

When a film-forming material is used for cosmetics, for example, not only is it safe for the human body, but performance such as ease of peeling off the film after application to the skin to form a film is required. Be done. For example, Patent Document 1 proposes a technique of using a pack cosmetic containing urethane having a specific structure as a main component as a film-forming material for the purpose of easily peeling off without irritating the skin. Has been done.

JP 2005-145835 A

However, the performance required for applications such as pack cosmetics is not only easy to peel off after forming a film, but also easy to spread when applied to the skin (ease of uniform application) and the formed film is high. It is also required to have strength. In this respect, it is difficult to say that the conventional film-forming material satisfies all the requirements of the ease of spreading when applied, the strength of the film, and the ease of peeling of the film. Further improvement is required, and development of such a film forming material has been strongly desired.

The present invention has been made in view of the above, in addition to excellent coating properties, it is possible to form a high-strength film, and moreover, a film-forming composition that can be easily peeled off after film formation, It is an object to provide a pack cosmetic containing the film-forming composition.

The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, the amount of the rubber component is set to a specific range with the rubber latex as a constituent component and the overall viscosity is adjusted to a specific range by the above object. The inventors have found that the above can be achieved and have completed the present invention.

That is, the present invention includes the subject matter described in the following sections, for example.
Item 1
In a film-forming composition containing a rubber component,
The content ratio of the rubber component is more than 10% by mass and less than 50% by mass,
A film-forming composition having a viscosity of 2,000 mPa·s or more and 50,000 mPa·s or less.
Item 2
Item 2. The film-forming composition according to Item 1, wherein the rubber component is polyisoprene.
Item 3
Item 3. The film-forming composition according to Item 1 or 2, further containing a viscosity modifier.
Item 4
Item 4. The film-forming composition according to any one of Items 1 to 3, which is used for pack cosmetics.
Item 5
Item 5. A pack cosmetic containing the film-forming composition according to Item 4.

The film-forming composition according to the present invention has excellent coatability and can form a film having high strength, and can be easily peeled off after the film formation.

Hereinafter, embodiments of the present invention will be described in detail. In this specification, the expressions "containing" and "including" include the concepts of "containing", "including", "consisting essentially of" and "consisting solely of".

The film-forming composition of the present invention contains a rubber component. Particularly, in the film-forming composition of the present invention, the content ratio of the rubber component is more than 10% by mass (not including 10% by mass), less than 50% by mass, and the viscosity of the composition is 2,000 mPa·s. The above is 50,000 mPa·s or less.

Here, in the present specification, the viscosity of the film-forming composition refers to a value obtained by measuring the film-forming composition with a B-type viscometer (manufactured by Brookfield, DV1 VISCOMETER) at 25°C.

The film-forming composition of the present invention contains a rubber component, and the content of the rubber component is in the above range and the viscosity of the composition is in the above range, whereby the coating property is excellent and the strength is high. A high film can be formed, and it can be easily peeled off after the film is formed. Hereinafter, the film-forming composition of the present invention will be simply referred to as "film-forming composition".

The type of the rubber component is not particularly limited, and for example, known rubber materials such as synthetic rubber and natural rubber can be widely adopted, and the type is not particularly limited as long as a desired film can be formed. ..

Specific examples of the rubber component include synthetic rubber such as polyisoprene and styrene-butadiene rubber.

In the film forming composition, the rubber component is preferably polyisoprene. In this case, a film having higher strength can be formed, and can be peeled off particularly easily after the film is formed. Further, since polyisoprene is known to be highly safe for the human body, when the rubber component is polyisoprene, the film-forming composition is applied to the skin of, for example, pack cosmetics. It is particularly suitable for applications such as

The type of polyisoprene is not particularly limited. Examples of polyisoprene include synthetic isoprene polymers obtained by polymerizing isoprene.

The synthetic isoprene polymer may be a copolymer containing another ethylenically unsaturated monomer copolymerizable with isoprene. In this case, the content of the isoprene unit is preferably 70% by mass or more, more preferably 90% by mass or more, and particularly preferably 95% by mass or more. Other ethylenically unsaturated monomers copolymerizable with isoprene are not particularly limited, and various known ethylenically unsaturated monomers can be widely adopted.

When the polyisoprene is a synthetic isoprene polymer, for example, the synthetic isoprene polymer in a known synthetic isoprene polymer latex can be used as the rubber component in the film-forming composition. The method for producing the synthetic isoprene polymer latex is not particularly limited, and for example, it can be obtained by a known production method. For example, when the rubber latex is the synthetic isoprene polymer latex, it can be produced by the method described in JP-A-2016-160365 or JP-A-2016-160366, for example.

The shape of the rubber component is not particularly limited, and may be, for example, a particulate shape. When the rubber component is in the form of particles, examples thereof include spherical particles, elliptic spherical particles, irregularly distorted irregularly shaped particles, and irregularly shaped particles.

The average particle size of the rubber component is not particularly limited and is preferably 0.6 to 3.0 μm, more preferably 0.8 to 2.0 μm.

The film-forming composition usually contains a solvent in addition to the rubber component. The type of solvent is not particularly limited, and examples thereof include water and various organic solvents. Examples of water include distilled water, tap water, industrial water, ion-exchanged water, deionized water, pure water, and electrolyzed water. Examples of the organic solvent include lower alcohols such as methanol, ethanol and isopropyl alcohol. The solvent may be a mixed solvent of water and an organic solvent, and in this case, both can be mixed at an appropriate ratio.

The film forming composition may contain various components other than the rubber component and the solvent as long as the effects of the present invention are not impaired.

For example, the film-forming composition can include a dispersion stabilizer. The dispersion stabilizer is preferably a component capable of having a function of stably dispersing the rubber component (without causing aggregation and sedimentation) in the film-forming composition. Examples of such a dispersion stabilizer include a polymer dispersion stabilizer. The polymer dispersion stabilizer may be a synthetic polymer, or a natural polymer or a polymer derived from a natural product. The dispersion stabilizer contained in the film-forming composition may be one kind or two or more different kinds.

When the polymer dispersion stabilizer is a synthetic polymer, for example, polyethylene oxide, polyethylene glycol, polymethacrylic acid or a salt thereof, a neutralized or partially neutralized product of polyacrylic acid, a neutralized product of polymethacrylic acid or Partially neutralized product, polyamino acid or its salt, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, polyethylene glycol, polyacrylamide, polyethyleneimine, dextrin, sodium alginate, polyvinyl alcohol, polyvinylpyrrolidone, β-naphthalenesulfonic acid formalin condensation Sodium salt and the like can be mentioned.

When the polymer dispersion stabilizer is a natural polymer or a polymer derived from a natural product, examples thereof include polysaccharides such as starch, agar and xanthan gum, and protein systems such as gelatin, casein and salts thereof.

When the polymer dispersion stabilizer forms a salt, examples thereof include a metal salt. The type of metal forming the metal salt is not particularly limited, and examples thereof include alkali metals such as sodium.

The polymer dispersion stabilizer is preferably a water-soluble polymer. In this case, the dispersion stability of the rubber component is particularly excellent.

The polymer dispersion stabilizer is particularly excellent in dispersion stability of the rubber component, and from the viewpoint that the physical properties of the film formed from the film-forming composition are not easily impaired, sodium caseinate, potassium caseinate, manganese caseinate, and caseinate. Zinc, polyvinyl alcohol, polyethylene oxide, β-naphthalene sulfonic acid formalin condensate sodium salt and the like are preferable.

The dispersion stabilizer can be manufactured by a known method. Alternatively, the dispersion stabilizer can be obtained from a commercial product.

Further, the film-forming composition may contain a viscosity modifier. When the film-forming composition contains a viscosity modifier, it becomes easy to adjust the viscosity of the film-forming composition within the above range (2,000 mPa·s or more and 50,000 mPa·s or less).

The type of the viscosity modifier is not particularly limited, and for example, a known viscosity modifier, specifically, a thickener widely used in the cosmetic field can be widely adopted. The viscosity modifier may have the property of being dissolved in the solvent in the film-forming composition, or may be of the property of being dispersed without being dissolved in the solvent. The viscosity modifier preferably has a property of dissolving in a solvent from the viewpoint of easily adjusting the viscosity of the film-forming composition to the above range.

Specific examples of the viscosity modifier include, for example, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, polyacrylic acid, polyacrylic acid (partial) neutralized product, polyethylene glycol, poly Acrylamide, polyethyleneimine, dextrin, sodium alginate, polyalkylene oxide modified product obtained by reacting polyalkylene oxide compound, diol compound and diisocyanate compound, water-soluble polymer containing alkyl modified carboxyl group and urethane associated polyalkylene oxide modification Examples thereof include viscous compositions containing substances. The viscosity modifier may be used alone or in combination of two or more. The viscosity modifier can be produced by a known method. Alternatively, the viscosity modifier can be obtained from a commercial product.

The film-forming composition may contain various known additives in addition to the dispersion stabilizer and the viscosity modifier as long as the effects of the present invention are not impaired. Examples of known additives include vulcanizing agents, vulcanization accelerators, pH adjusters, light stabilizers, antioxidants, preservatives, surfactants, colorants, antifungal agents, and lubricants. One or more of these additives may be contained in the film-forming composition.

From the viewpoint of easily adjusting the viscosity of the film-forming composition to a predetermined range and easily obtaining the desired effect, the film-forming composition contains at least a rubber component, a solvent, and a viscosity modifier. Is more preferable, and it is further preferable that at least a rubber component, a solvent, a viscosity modifier, and a dispersion stabilizer are contained.

The content ratio of the rubber component is more than 10% by mass and less than 50% by mass with respect to the total mass of the film-forming composition. When the content ratio of the rubber component is 10% by mass or less based on the total mass of the film-forming composition, the strength of the film formed from the film-forming composition becomes small, and, for example, when the film is peeled, rupture and Damage and the like are likely to occur. When the content ratio of the rubber component is 50% by mass or more based on the total mass of the film-forming composition, the rubber component is likely to aggregate in the film-forming composition, and the coating property is (extendability during coating). Etc.) becomes worse and it becomes difficult to form a film.

The content ratio of the rubber component is preferably 15% by mass or more, more preferably 20% by mass or more, and particularly preferably 25% by mass or more, based on the total mass of the film-forming composition.

The content ratio of the rubber component is preferably 45% by mass or less, more preferably 40% by mass or less, and particularly preferably 35% by mass or less, based on the total mass of the film-forming composition.

In the film-forming composition, the content ratio of the solvent is not particularly limited, and can be appropriately adjusted within a range in which the rubber component is dispersed and a desired film can be formed. For example, the content ratio of the solvent is preferably 50% by mass or more, more preferably 55% by mass or more, and particularly preferably 60% by mass or more, based on the total mass of the film-forming composition. .. The content ratio of the solvent is preferably 90% by mass or less, more preferably 85% by mass or less, and particularly preferably 80% by mass or less, based on the total mass of the film-forming composition. ..

The content ratio of the dispersion stabilizer contained in the film-forming composition is not particularly limited, and can be appropriately adjusted within a range in which the rubber component is dispersed and a desired film can be formed. For example, the content ratio of the dispersion stabilizer is preferably 0% by mass or more, more preferably 0.05% by mass or more, and 0.1% by mass or more based on the total mass of the film-forming composition. Is particularly preferable. Further, the content ratio of the dispersion stabilizer is preferably 10% by mass or less, more preferably 5% by mass or less, and further preferably 3% by mass or less with respect to the total mass of the film-forming composition. Particularly preferred.

If the content ratio of the dispersion stabilizer contained in the film-forming composition is based on the total mass of the rubber component, the content ratio of the dispersion stabilizer is 0% by mass or more based on the total mass of the rubber component. Is preferable, 0.5% by mass or more is more preferable, and 1% by mass or more is particularly preferable. The content ratio of the dispersion stabilizer is preferably 10% by mass or less, more preferably 7% by mass or less, and particularly preferably 5% by mass or less, based on the total mass of the rubber component.

The content ratio of the viscosity modifier contained in the film-forming composition is not particularly limited, and can be appropriately adjusted depending on the molecular weight and composition of the viscosity modifier and within a range capable of achieving a desired viscosity range. For example, the content ratio of the viscosity modifier is preferably 0% by mass or more, more preferably 0.1% by mass or more, and 0.2% by mass or more based on the total mass of the film-forming composition. Is particularly preferable. In addition, the content ratio of the viscosity modifier is preferably 5% by mass or less, more preferably 3% by mass or less, and more preferably 2% by mass or less with respect to the total mass of the film-forming composition. Particularly preferred.

When the film-forming composition contains an additive other than the rubber component, the solvent, the viscosity modifier and the dispersion stabilizer, the content ratio of the additive is, for example, 5% by mass relative to the total mass of the film-forming composition. It can be set to the following, preferably 3% by mass or less, and particularly preferably 1% by mass or less.

The film forming composition has a viscosity of 2,000 mPa·s or more and 50,000 mPa·s or less. When the viscosity of the film-forming composition is less than 2,000 mPa·s, a phenomenon such as dripping is likely to occur during application, and a desired film cannot be formed. When the viscosity of the film-forming composition exceeds 50,000 mPa·s, the viscosity is too high, so that the spread of coating during application is deteriorated and the desired film is not formed.

The viscosity of the film-forming composition is preferably 2,500 mPa·s or more, more preferably 2,800 mPa·s or more, and particularly preferably 3,000 mPa·s or more. The viscosity of the film-forming composition is preferably 47,000 mPa·s or less, more preferably 45,000 mPa·s or less, and particularly preferably 43,000 mPa·s or less.

The method for producing the film-forming composition is not particularly limited. For example, a film-forming composition can be prepared by mixing each material contained in the film-forming composition as a raw material and mixing them in a predetermined amount. The mixing method and the mixing conditions are not particularly limited, and known methods can be widely adopted.

For example, the film-forming composition can be prepared by using, as a raw material, a rubber latex in which a rubber component is dispersed in a dispersion medium. In this case, the film-forming composition can be obtained by mixing the rubber latex with other raw materials, and the rubber component contained in the rubber latex becomes the rubber component of the film-forming composition. That is, the rubber component in the rubber latex is the same as the rubber component contained in the film-forming composition.

The solid content concentration of the rubber latex is not particularly limited and is, for example, 40% by weight or more, preferably 40 to 70% by weight, and more preferably 50 to 70% by weight.

In the rubber latex, the dispersion medium is not particularly limited, and the dispersion medium used in the conventional rubber latex can be widely applied. As the dispersion medium, water can be mentioned because of its excellent dispersibility of the rubber component. Examples of water include distilled water, tap water, industrial water, ion-exchanged water, deionized water, pure water, and electrolyzed water. The dispersion medium may be a mixed solvent of an organic solvent and water as long as the dispersion stability of the rubber component is not impaired. Examples of the organic solvent include lower alcohols such as methanol, ethanol and isopropyl alcohol. The organic solvent may be a single solvent or a mixed solvent containing two or more kinds.

The rubber latex is preferably polyisoprene latex. In this case, a film-forming composition that can form a desired film is easy to produce, and the obtained film-forming composition is highly safe for the human body. When the rubber latex is a polyisoprene latex, examples of the polyisoprene in this case include the same types as the polyisoprene described in the film-forming composition. The method for producing the rubber latex is the same as the method described above.

The rubber latex may contain a dispersion stabilizer. In this case, the dispersion stabilizer serves as the dispersion stabilizer component of the film-forming composition. Therefore, the dispersion stabilizer contained in the rubber latex is the same as the dispersion stabilizer contained in the film-forming composition. In addition, the rubber latex may contain other known vulcanizing agents, vulcanization accelerators and the like.

The film-forming composition can be prepared, for example, by mixing a rubber latex with a dispersion stabilizer and a viscosity modifier which are used as necessary. A solvent such as water may be further mixed for the purpose of adjusting the content ratio of the rubber component of the film forming composition. The solvent in this case is preferably the same as the dispersion medium of the rubber latex. An example of a method for producing the film-forming composition is a method of mixing a raw material obtained by mixing a rubber latex and a dispersion stabilizer with a raw material obtained by mixing a viscosity modifier and a solvent. It can be used in the state of being dissolved or dispersed in a dispersion stabilizer and a viscosity modifier, for example, a solvent. The solvent in this case is preferably the same as the dispersion medium of the rubber latex.

The use ratios of the rubber latex, the dispersion stabilizer, the viscosity modifier and the solvent can be appropriately adjusted according to the intended film-forming composition.

The film-forming composition of the present invention can be applied to a substrate or a human body to form a film. As the base material, well-known materials used for film formation can be widely applied. Examples of the base material include a glass substrate, a metal substrate, a resin substrate, a resin film, a nonwoven fabric, and a fibrous sheet.

The coating method of the film-forming composition is not particularly limited, and known coating methods can be widely adopted. After applying the film-forming composition, a film can be formed by performing a drying treatment or the like, if necessary.

The film formed from the film-forming composition has high strength and can be easily peeled off. Therefore, the film-forming composition can be suitably used for various applications such as pack cosmetics such as face packs, paints such as body paints, and adhesives, pressure-sensitive adhesives, coating agents and the like. In particular, since the film of the film-forming composition has the above properties, the film-forming composition is suitable for use in pack cosmetics or for use in pack cosmetics.

The film-forming composition may be used alone as a pack cosmetic, or, if necessary, the film-forming composition may be combined with other materials or members to give a pack cosmetic. Since the pack cosmetic of the present invention contains the film-forming composition, the pack cosmetic has excellent coatability on the skin and can be easily peeled off after packed.

Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to the modes of these examples.

[Evaluation methods]
(Viscosity measurement)
The viscosities of the cosmetics obtained in Examples and Comparative Examples were measured using a B-type viscometer (DV1 VISCOMTER, manufactured by Brookfield) at a rotation speed of 20 rpm and a measurement temperature of 25°C.

(Sensory evaluation; coatability and film evaluation)
A total of 10 testers, 5 each for men and women, applied 0.5 g of each of the cosmetics obtained in Examples and Comparative Examples to the inner part of the forearm to form a coating film, and dried the coating film for 10 minutes. To form a film. At this time, the easiness of spreading the cosmetic and the easiness of peeling the film were evaluated according to the following criteria.
<Ease of stretching>
◯: Stretches uniformly.
(Triangle|delta): Sagging occurs at the time of application and after application, and it is difficult to stretch or stretches unevenly.
X: It cannot be extended.
<Easy peeling of film>
○: Can be easily peeled off without tearing.
Δ: Peeling is possible, but some tearing occurs.
X: Tearing is difficult to occur and peeling is difficult.

(Example 1)
In a beaker, a synthetic polyisoprene latex (average particle diameter 1.40 μm, solid content concentration: 67% by mass, dispersion medium: water) as a rubber latex, and a 10% by mass aqueous solution of sodium caseinate as a dispersion stabilizer were mixed. 1 raw material was obtained. On the other hand, a 2% by mass aqueous solution of a partially neutralized polyacrylic acid (“AQPEC MG N40R” manufactured by Sumitomo Seika Chemical Co., Ltd.) as a viscosity modifier was mixed with water to obtain a second raw material. Next, the cosmetic material was prepared by mixing the first raw material and the second raw material. In the preparation of this cosmetic, the synthetic polyisoprene latex, the dispersion stabilizer aqueous solution, the 2% by mass aqueous solution of the partially neutralized polyacrylic acid, and water were each 44.8 relative to the total amount of the cosmetic. The respective raw materials were mixed so as to be mass%, 9 mass%, 15 mass% and 31.2 mass%. Therefore, this cosmetic contains 30% by mass of the rubber component with respect to the total amount, and water (however, the water here includes the rubber latex, the dispersion stabilizer, and the water of the aqueous solution of the partially neutralized polyacrylic acid). Contains 68.8% by mass.

(Example 2)
Synthetic polyisoprene latex, 10% by weight aqueous solution of sodium casein, 2% by weight aqueous solution of partially neutralized polyacrylic acid, and water are 59.7% by weight and 12% by weight, respectively, based on the total amount of the cosmetic. %, 10% by mass and 18.3% by mass, respectively, to obtain a cosmetic material in the same manner as in Example 1 except that the respective raw materials were mixed. Therefore, this cosmetic contains 40% by mass of the rubber component with respect to the total amount, and water (however, the water here includes the rubber latex, the dispersion stabilizer, and the water of the aqueous solution of the partially neutralized polyacrylic acid). Contains 58.6% by mass.

(Example 3)
Synthetic polyisoprene latex, 10% by mass aqueous solution of sodium caseinate, 2% by mass aqueous solution of partially neutralized polyacrylic acid, and water are 29.9% by mass and 6% by mass, respectively, with respect to the total amount of the cosmetic. %, 15% by mass, and 49.1% by mass, except that the respective raw materials were mixed to obtain a cosmetic material in the same manner as in Example 1. Therefore, this cosmetic contains 20% by mass of the rubber component with respect to the total amount, and water (however, the water here includes the rubber latex, the dispersion stabilizer, and the water of the aqueous solution of the partially neutralized polyacrylic acid). Contains 79.1% by mass.

(Example 4)
Synthetic polyisoprene latex, 10% by mass aqueous solution of sodium caseinate, 2% by mass aqueous solution of partially neutralized polyacrylic acid, and water are 29.9% by mass and 6% by mass, respectively, with respect to the total amount of the cosmetic. %, 25% by mass, and 39.1% by mass, except that the respective raw materials were mixed to obtain a cosmetic in the same manner as in Example 1. Therefore, this cosmetic contains 20% by mass of the rubber component with respect to the total amount, and water (however, the water here includes the rubber latex, the dispersion stabilizer, and the water of the aqueous solution of the partially neutralized polyacrylic acid). Contains 78.9% by mass.

(Comparative Example 1)
Synthetic polyisoprene latex, 10 mass% aqueous solution of sodium caseinate, 2 mass% aqueous solution of partially neutralized polyacrylic acid, and water are 44.8 mass% and 9 mass, respectively, with respect to the total amount of the cosmetic. %, 10% by mass and 36.2% by mass, respectively, to obtain a cosmetic by the same method as in Example 1 except that the respective raw materials were mixed. Therefore, this cosmetic contains 30% by mass of the rubber component with respect to the total amount, and water (however, the water here includes the rubber latex, the dispersion stabilizer, and the water of the aqueous solution of the partially neutralized polyacrylic acid). Contains 68.9% by mass.

(Comparative example 2)
Synthetic polyisoprene latex, 10% by mass aqueous solution of sodium caseinate, 2% by mass aqueous solution of partially neutralized polyacrylic acid, and water are 44.8% by mass and 9% by mass with respect to the total amount of the cosmetics, respectively. %, 25 mass %, 21.2 mass %, except that the respective raw materials were mixed to obtain a cosmetic material in the same manner as in Example 1. Therefore, this cosmetic contains 30% by mass of the rubber component with respect to the total amount and water (however, the water here also includes the water of the rubber latex, the dispersion stability and the aqueous solution of the partially neutralized polyacrylic acid). Contains 68.6% by mass.

(Comparative example 3)
Synthetic polyisoprene latex, 10 mass% aqueous solution of sodium caseinate, 2 mass% aqueous solution of partially neutralized polyacrylic acid, and water are 14.9 mass% and 3 mass% with respect to the total amount of the cosmetics, respectively. %, 25% by mass and 57.1% by mass, respectively, to obtain a cosmetic by the same method as in Example 1 except that the respective raw materials were mixed. Therefore, this cosmetic contains 10% by mass of the rubber component with respect to the total amount, and water (however, the water here includes the rubber latex, the dispersion stabilizer, and the water of the aqueous solution of the partially neutralized polyacrylic acid). Contains 89.2% by mass.

(Comparative example 4)
Synthetic polyisoprene latex, 10 mass% aqueous solution of sodium caseinate, 2 mass% aqueous solution of partially neutralized polyacrylic acid, and water are 74.6 mass% and 15 mass% with respect to the total amount of the cosmetics, respectively. %, 10% by mass and 0.4% by mass, respectively, to obtain a cosmetic material in the same manner as in Example 1 except that the respective raw materials were mixed. Therefore, this cosmetic contains 50% by mass of the rubber component with respect to the total amount, and water (however, the water here includes rubber latex, dispersion stability, and water of an aqueous solution of partially neutralized polyacrylic acid). Contains 48.3% by mass.

Table 1 shows the results of viscosity measurement and the results of sensory evaluation (coating property and film evaluation) of the cosmetics obtained in each Example and Comparative Example. In Table 1, the content ratio of the rubber component (polyisoprene) in the cosmetic is also shown.

From the sensory evaluation results of the cosmetics of Examples 1 to 4 shown in Table 1, it was found that any of the cosmetics had excellent coatability on the skin, and it was easy to form a film having high strength. I also found that it can be peeled off. Therefore, the coating composition having a rubber component content of more than 10% by mass and less than 50% by mass and a viscosity of 2,000 mPa·s or more and 50,000 mPa·s or less is excellent in coating property. It was demonstrated that a film having high strength can be formed and that the film can be easily peeled off after the film is formed.

Claims (5)

In a film-forming composition containing a rubber component,
The content ratio of the rubber component is more than 10% by mass and less than 50% by mass,
A film-forming composition having a viscosity of 2,000 mPa·s or more and 50,000 mPa·s or less. The film-forming composition according to claim 1, wherein the rubber component is polyisoprene. The film-forming composition according to claim 1, further comprising a viscosity modifier. The film-forming composition according to any one of claims 1 to 3, which is for pack cosmetics. A pack cosmetic containing the film-forming composition according to claim 4.