JP6292577B2 - Porous elastic body for makeup, resin pellet for porous elastic body for makeup, and method for producing the porous elastic body for makeup - Google Patents

Description

  The present invention relates to a cosmetic porous elastic body, a resin pellet for a cosmetic porous elastic body, and a method for producing the cosmetic porous elastic body.

  Conventionally, polyurethane-based porous resins have been used for cosmetic porous elastic bodies such as cosmetic chips. However, polyurethane porous resins are easily discolored by ultraviolet rays or the like, and are easily hydrolyzed, so that the product life is short. Therefore, porous bodies using other types of resins have been studied.

  Patent Document 1 discloses at least one thermoplastic resin, a water-soluble foam forming material that is thermally stable at a temperature at which the thermoplastic resin melts, and a water-soluble polymer compound that acts as a lubricant. And a microporous body having a three-dimensional open-cell structure obtained by extracting and removing the water-soluble bubble-forming material and the water-soluble polymer compound with water from a molded body of a mixture obtained by mixing under heating conditions. .

  Patent Document 2 discloses at least one type of thermoplastic resin, a water-soluble bubble-forming material that is thermally stable at a temperature at which the thermoplastic resin can be melted, and a water-soluble polymer compound that acts as a lubricant. And kneading the resulting premixed product under heating, the kneaded product is subjected to extrusion molding to form a molded product of a required shape, and the resulting molded product is brought into contact with water to dissolve the water. A method for producing a microporous body is described in which a microporous body having a three-dimensional open-cell structure is produced by extracting a porous cell forming material and a water-soluble polymer compound.

  Patent Document 3 discloses at least one kind of thermoplastic resin, a water-soluble bubble-forming material that is thermally stable at a temperature at which the thermoplastic resin can be melted by heat, and a high water-solubility that acts as a lubricant. A molecular compound is mixed, the mixture is kneaded under heating, the kneaded product is subjected to injection molding to form a molded body having a required shape, and the molded body is brought into contact with water, whereby the water is removed from the molded body. It describes a method for producing a microporous body that obtains a microporous body having a three-dimensional open cell structure by extracting and removing a soluble bubble forming material and a water-soluble polymer compound.

  In the production methods described in Patent Document 1 to Patent Document 3, a micro porous body is formed by a so-called extraction method or wet method (see paragraph 0003 of Patent Document 1).

  According to the extraction method, resin pellets are molded, and the resin pellets are manufactured by injection molding, so that mass production is possible, and because a mold is used, a product having a complicated structure can be made. Has a merit.

JP 2001-302839 A JP 2001-348455 A JP 2002-80628 A

  In order to provide a porous cosmetic elastic body that is not discolored by ultraviolet rays, an attempt was made to produce a porous elastic body for cosmetics using various resins that do not discolor to ultraviolet rays. As a result, it was possible to obtain a cosmetic porous elastic body having no discoloration. However, as a cosmetic applicator, a touch or the like that touches the skin is important, and a product that satisfies the functions as a cosmetic applicator (for example, skin contact, touch, etc.) has not been obtained.

Therefore, while aiming to develop a porous elastic body for cosmetics that does not have the above-mentioned problems, various investigations have been made. As a result, a porous elastic body in which a predetermined resin is mixed at a predetermined blending ratio has good skin contact. And a material having a phenomenon that the shape recoverability of the elastic body itself deteriorates due to heat when drying the porous elastic body and does not return to the original shape, functions as a cosmetic applicator (for example, It was found that the skin perception, touch, etc. are good.
In the extraction method, a microporous body is produced by removing inorganic salts and the like from an injection-molded molded article using a solvent such as water. Therefore, the final product needs to be dried. At this time, when a certain kind of resin is used, there is a phenomenon that the shape recoverability of the resin itself is lowered by the heat at the time of drying, and the original shape cannot be restored.

  That is, as a result of various investigations aimed at the development of a porous cosmetic elastic body that is not discolored by ultraviolet rays or the like and has good skin contact, etc., the present invention has been developed as an ethylene-α-olefin copolymer resin. It has been found that the above object can be achieved by mixing a phase method metallocene polyethylene resin and a metallocene elastomer in a predetermined ratio.

  The porous porous body for cosmetics according to the present invention comprises a mixture of a vapor phase metallocene polyethylene resin and a metallocene elastomer as an ethylene-α-olefin copolymer resin in 100 parts by weight of the vapor phase metallocene polyethylene resin. On the other hand, the metallocene elastomer is blended in an amount of 25 to 40 parts by weight.

  The cosmetic porous elastic body according to the present invention preferably has an E hardness of 35 to 45.

  The cosmetic porous elastic body according to the present invention preferably has a compressive residual strain (a reduction rate with respect to the original thickness) measured from JIS K 6400-4 of -30% to -35%.

  The resin pellet for a porous elastic body for cosmetics according to the present invention comprises a mixture of a vapor phase metallocene polyethylene resin and a metallocene elastomer as an ethylene-α-olefin copolymer resin, and the vapor phase metallocene polyethylene resin 100. The said metallocene elastomer mix | blends 25-40 weight part with respect to a weight part, a water-soluble inorganic compound, a water-soluble organic compound, and a synthetic resin plasticizer.

  In the resin pellet for a cosmetic porous elastic body according to the present invention, the water-soluble organic compound is preferably a mixture of a water-soluble organic compound that is solid at room temperature and a water-soluble organic compound that is liquid at room temperature.

  The resin pellet for a porous porous elastic body for cosmetics according to the present invention is a water-soluble organic compound that is solid at room temperature, one or more selected from polyethylene glycol, resorcin, and erythritol having a polymerization degree of 4000 or more, and is water-soluble at room temperature. It is preferable that the organic compound is glycerin.

  In the method for producing porous elastic for cosmetics according to the present invention, a mixture of a vapor phase metallocene polyethylene resin and a metallocene elastomer is used as an ethylene-α-olefin copolymer resin, and the vapor phase metallocene polyethylene resin 100 wt. The resin pellet is molded by kneading 25 to 40 parts by weight of the metallocene elastomer, a water-soluble inorganic compound, a water-soluble organic compound, and a synthetic resin plasticizer with respect to a part. The molded body is injected to form a molded body, and the molded body is immersed in water to elute the water-soluble inorganic compound and the water-soluble organic compound.

  In the method for producing porous elastic for cosmetics according to the present invention, it is preferable to dry the molded body after elution of the water-soluble inorganic compound and the water-soluble organic compound at 75 ° C. or lower.

  The cosmetic porous elastic body of the present invention does not discolor even with ultraviolet rays and has good skin contact. In addition, since injection molding is possible, products having complicated shapes can be manufactured.

The cosmetic porous elastic body according to the present invention will be described.
The porous porous body for cosmetics according to the present invention comprises a mixture of a vapor phase metallocene polyethylene resin and a metallocene elastomer as an ethylene-α-olefin copolymer resin in 100 parts by weight of the vapor phase metallocene polyethylene resin. On the other hand, the metallocene elastomer is blended in an amount of 25 to 40 parts by weight.

The ethylene-α-olefin copolymer resin can be produced using a Ziegler catalyst, a vanadium catalyst or a metallocene catalyst, preferably a vanadium catalyst or a metallocene catalyst, more preferably a metallocene catalyst. Examples of the production method include a high-pressure ion polymerization method, a gas phase method, a solution method, and a slurry method.
Although it does not necessarily limit as a metallocene catalyst, The catalyst which uses a metallocene compound, such as a zirconium compound coordinated with the group which has a cyclopentadienyl skeleton, etc., and a promoter as a catalyst component is mentioned.
Examples of the gas phase metallocene polyethylene resin include Harmolex (registered trademark) series manufactured by Nippon Polyethylene, Evolue (registered trademark) series manufactured by Prime Polymer, and the like.
Examples of the metallocene elastomer include Kernel (registered trademark) series manufactured by Nippon Polyethylene Co., Ltd., Exelen (registered trademark) FX series manufactured by Sumitomo Chemical Co., Ltd., and the like.
Further, Harmolex (registered trademark) series manufactured by Nippon Polyethylene Co., Ltd. is a vapor phase metallocene polyethylene resin, which is a functional polyethylene resin produced by a vapor phase production technique. The Kernel (registered trademark) series manufactured by Nippon Polyethylene Co., Ltd. is a metallocene elastomer and a resin produced by high-pressure manufacturing technology.

The gas phase metallocene polyethylene resin preferably has a MFR (melt flow rate, measured according to JIS K6922-2) in the range of 1.0 g / 10 min to 1.5 g / 10 min. The density (measured by JIS K7112) is preferably in the range of 0.906 g / cm3 to 0.919 g / cm3.
The melting point (DSC method, measured by JIS K7121) is preferably in the range of 120 ° C to 124 ° C.

As the properties of the metallocene elastomer, MFR (melt flow rate, measured according to JIS K6922-2) is preferably in the range of 2.0 g / 10 min to 3.5 g / 10 min. The density (measured by JIS K7112) is preferably in the range of 0.880 g / cm3 to 0.921 g / cm3.
The melting point (DSC method, measured by JIS K7121) is preferably in the range of 60 ° C to 108 ° C.

The metallocene elastomer is blended in an amount of 25 to 40 parts by weight, preferably 28 to 40 parts by weight, per 100 parts by weight of the gas phase method metallocene polyethylene resin.
The resin has light resistance to ultraviolet rays, and is not discolored by ultraviolet rays by producing a cosmetic porous elastic body with the resin.
In addition, a metallocene polyethylene resin alone or a metallocene elastomer alone is too hard or too soft, but by using the above resin mixed in a predetermined range, a porous porous body for cosmetics with good skin feel is obtained. be able to.

The cosmetic porous elastic body according to the present invention has an E hardness of 35 to 45, preferably 38 to 45. The porous porous body for cosmetics in which the gas phase method metallocene polyethylene resin and the metallocene elastomer are blended within the predetermined range has good skin contact. This is because the metallocene polyethylene resin alone or the metallocene elastomer alone is too hard or too soft, but it is considered that the resin has a hardness suitable for the skin by mixing and using the above resin within a predetermined range. It is done.
The E hardness was measured using an E-type hardness meter (manufactured by Kobunshi Keiki Co., Ltd., rubber hardness meter with stylus).

  The porous porous body for cosmetics according to the present invention has a compressive residual strain (a reduction rate indicating how much the original thickness has decreased) as measured by JIS K 6400-4 of −30% to −35. %, Preferably -33% to -35%. Usually, it seems that a product having such a compressive residual strain is not recognized as a product. However, contrary to the intention, a result that the skin contact is good is obtained within this numerical range. The result of the sensory test shows that the skin contact is good. Although the detailed mechanism is unknown, it is considered that the elasticity when brought into contact with human skin is determined to be comfortable for humans by blending a predetermined resin in a predetermined ratio.

Next, the resin pellet for a porous elastic body for makeup according to the present invention will be described.
The resin pellet for a porous elastic body for cosmetics according to the present invention comprises a mixture of a vapor phase metallocene polyethylene resin and a metallocene elastomer as an ethylene-α-olefin copolymer resin, and the vapor phase metallocene polyethylene resin 100. The said metallocene elastomer mix | blends 25-40 weight part with respect to a weight part, a water-soluble inorganic compound, a water-soluble organic compound, and a synthetic resin plasticizer.

  The gas phase method metallocene-based polyethylene resin and the metallocene elastomer are those described above. The blending amount of the gas phase method metallocene polyethylene resin and the metallocene elastomer is also the same as described above.

The water-soluble inorganic compound that can be used in the present invention is soluble in water and a mixture of a vapor phase metallocene polyethylene resin and a metallocene elastomer (hereinafter referred to as “resin mixture”) is melted. In addition, any thermally stable substance can be used.
For example, the by _{inorganic, NaCl, KCl, CaCl 2,} NH 4 Cl, Na 2 SO 4, NaHSO 4 , and the like.

As a compounding quantity of the said water-soluble inorganic compound, 800-1500 weight part can be mix | blended with respect to 100 weight part of resin mixtures, Preferably, 900-1200 weight part can be mix | blended, More preferably, 900-1000 weight part is mix | blended. be able to.
By changing the blending amount of the water-soluble inorganic compound, the size of the finally formed three-dimensionally communicating pores can be changed. In addition, the particle size and the like of the water-soluble inorganic compound can be appropriately adjusted.

The water-soluble organic compound that can be used in the present invention may be solid or liquid, for example, polyethylene glycol derivatives such as polyethylene glycol, polyethylene glycol diacrylate, polyethylene glycol dioleate, polyethylene glycol diacetate, Any glycerin, resorcin, pentaerythritol, or any other compound that dissolves in water and acts to lower the viscosity of the resin can be used. In particular, polyethylene glycol can be suitably used because it has a high melt flow rate and high water solubility.
The water-soluble organic compound also has an action of promoting the extraction / removal of the water-soluble inorganic compound. Furthermore, when performing injection molding, the polymerization degree of the polyethylene glycol is preferably 4000 or more. When the polymerization degree of the polyethylene glycol is 4000 or more, it is possible to realize injection molding capable of reproducing even a fine part.

  As a compounding quantity of the said water-soluble organic compound, 60-120 weight part can be mix | blended with respect to 100 weight part of resin mixtures. Within this range, extraction / removal of the water-soluble inorganic compound is promoted, and beautiful three-dimensionally communicating pores can be obtained.

  As the synthetic resin plasticizer, a commercially available synthetic resin plasticizer can be appropriately used. For example, a polyethylene glycol nonionic activator, liquid paraffin, etc. can be used.

  As a compounding quantity of the said synthetic resin plasticizer, 50-100 weight part can be mix | blended with respect to 100 weight part of resin mixtures. By blending in the range, injection molding is facilitated.

  In the present invention, as other additive agents, for example, various pigments, various surfactants, various antibacterial agents and the like can be appropriately added.

As a method for producing the resin pellet for a cosmetic porous elastic body according to the present invention, various commonly used methods can be used.
For example, for mixing and kneading the resin mixture, water-soluble inorganic compound, water-soluble organic compound and synthetic resin plasticizer, a single screw or twin screw extruder, a kneader, a pressure kneader, a kneader, a banbury A mixer, a Henschel type mixer, a rotor type mixer or other kneaders are preferably used. For this kneading, no special apparatus is required, and the kneading speed and the like are not limited. The temperature at the time of kneading | mixing is suitably set with the heat melting point of resin to be used.

  The kneading time depends on the physical properties of the various mixtures, but it is sufficient that the mixture is sufficiently mixed and kneaded. Usually, about 30 to 40 minutes is sufficient. At this time, care should be taken because excessively long kneading causes deterioration of the resin as the main material. The kneaded resin pellets can be molded into a required shape by extrusion, injection, press, roller or blow, but extrusion or injection molding which can form a complicated shape is particularly suitable for mass production.

By using such resin pellets, molded bodies having various shapes can be produced.
Moreover, if injection molding is performed using the resin pellet, a molded body having a complicated shape can be produced. In addition, a molded object can be made into the porous elastic body which has a three-dimensional communication structure by washing away a water-soluble inorganic compound and a water-soluble organic compound, for example with water or warm water. This manufacturing method will be described later.

Next, although the manufacturing method of the porous elastic body for cosmetics concerning this invention is demonstrated, this invention is not limited only to the Example which concerns. .
In order to produce a porous porous body for cosmetics according to the present invention, first, a gas phase method metallocene polyethylene resin and a metallocene elastomer as raw materials, a water-soluble inorganic compound, and a water-soluble organic compound are used in a predetermined apparatus. Then, mixing and kneading are performed, resin pellets are molded, and injection molding is performed using the obtained resin pellets to obtain a molded body having a predetermined shape.
The molded body thus obtained is immersed in water or warm water at a predetermined temperature to extract and remove the water-soluble inorganic compound and the water-soluble organic compound, and has a large number of fine pores. A cosmetic porous elastic body having a structure is obtained.

  For mixing and kneading of gas phase method metallocene polyethylene resin and metallocene elastomer, water-soluble inorganic compound and water-soluble organic compound, single or twin screw extruder, kneader, pressure kneader, conida, banbury A mixer, a Henschel type mixer, a rotor type mixer or other kneaders are preferably used. For this kneading, no special apparatus is required, and the kneading speed and the like are not limited. The temperature at the time of kneading | mixing is suitably set with the heat melting point of resin to be used.

  Although the kneading time depends on the physical properties of the various blends, it is sufficient that the blend is sufficiently mixed and kneaded, and usually about 30 to 40 minutes is sufficient. At this time, care should be taken because excessively long kneading causes deterioration of the resin as the main material. The kneaded resin pellets can be molded into a required shape by extrusion, injection, press, roller or blow, but extrusion or injection molding which can form a complicated shape is particularly suitable for mass production.

  A molded body formed by blending each component into a predetermined shape is obtained by adding a water-soluble inorganic compound and a water-soluble organic compound to water as a solvent for a predetermined time (for example, 24 to 48 hours, the shape and thickness of the molded body). (Depends on) Extraction and removal by immersion. In addition, any method may be used for the immersion in this case, but extraction / removal by immersion in water in which the entire molded body is brought into contact with water is preferable. The temperature of the water used at this time is not particularly limited and may be about room temperature. However, in order to efficiently remove the water-soluble inorganic compound and the water-soluble organic compound, the temperature of 15 to 60 ° C. Hot water may be used.

After removing the water-soluble inorganic compound and water-soluble organic compound, the drying process is started, but the temperature for forced drying needs to be adjusted to 75 ° C. or lower. This is because if the resin is dried at a temperature exceeding 75 ° C., the shape recoverability of the resin itself is lowered, and a phenomenon that the resin cannot return to its original shape occurs. Usually, it is preferable to dry in the range of 50 ° C to 75 ° C.
Although the present invention depends on the temperature at the time of drying, a cosmetic porous elastic body having a good feeling of use can be obtained, and it is particularly necessary to pay attention to the temperature at the time of drying. Of course, it may be naturally dried at room temperature, but it is not efficient because it takes time.
In addition, various apparatuses can be used about the dryer used when drying.

  The porous porous elastic body for cosmetics according to the present invention is long-lasting because it is not discolored by ultraviolet rays, is not discolored by NO gas, and is resistant to hydrolysis by water or the like. Furthermore, it is a porous elastic body for cosmetics that has good skin contact and is optimal for cosmetic use.

Hereinafter, an Example is shown about the porous elastic body for cosmetics which concerns on this invention.
Example 1
11 parts by weight of vapor phase metallocene polyethylene resin (Nippon Polyethylene Co., Ltd .: trade name “Harmorex NF-324A”), 3 parts of metallocene elastomer (Nippon Polyethylene Co., Ltd .: trade name “Kernel KS-240T”) Part, 55 parts by weight of dead glass (particle size 150 mesh), 75 parts by weight of dead glass (60 mesh size), 6 parts by weight of glycerin, water-soluble polyethylene glycol (Daiichi Kogyo Seiyaku Co., Ltd. (degree of polymerization: 4000)) Weigh 10 parts by weight, 10 parts by weight liquid paraffin, 0.5 parts by weight polyethylene glycol nonionic active agent, stir well with a ribbon blender, then at a rate of 40 kg / hr with a twin screw extruder (temperature 180 ° C.) And pelletized by pulverization with a pelletizer.
Using the resin pellets as raw materials, a cosmetic chip-shaped molded body was prepared using an injection molding machine. The molded body was then immersed in water (temperature 45 ° C.) for 48 hours. Thereafter, dehydration was repeated twice to completely wash out the water-soluble inorganic compound and the water-soluble organic compound contained therein, and then dried at a drying temperature of 75 ° C. for 24 hours to produce a cosmetic chip.
The cosmetic chip had an E hardness of 42 and a compression residual strain of -33%.
In addition, as a physical property of Nippon Polyethylene Co., Ltd. product name used in the examples and comparative examples: “Harmorex NF-324A”, MFR (melt flow rate): 1.0 g / 10 min (JIS K6922-2), Density: 0.906 g / cm3 (JIS K7112), flexural modulus: 80 MPa (JIS K6922-2), melting point (DSC method): 120 ° C. (JIS K7121). Also, Nippon Polyethylene Co., Ltd .: Product name “Kernel KS-240T” has physical properties of MFR (melt flow rate): 2.2 g / 10 min (JIS K6922-2), density: 0.880 g / cm3 (JIS K7112) Flexural modulus: 25 MPa (JIS K6922-2), melting point (DSC method): 60 ° C. (JIS K7121).

(Example 2)
11 parts by weight of vapor phase metallocene polyethylene resin (Nippon Polyethylene Co., Ltd .: trade name “Harmorex NF-324A”), 3 parts of metallocene elastomer (Nippon Polyethylene Co., Ltd .: trade name “Kernel KS-240T”) Part, 55 parts by weight of dead glass (particle size 150 mesh), 75 parts by weight of dead glass (particle size 100 mesh), 5 parts by weight of glycerin, water-soluble polyethylene glycol (Daiichi Kogyo Seiyaku Co., Ltd. (degree of polymerization: 4000)) A cosmetic chip was prepared under the same conditions as in Example 1 using 10 parts by weight, 10 parts by weight liquid paraffin, and 0.5 parts by weight of a polyethylene glycol nonionic activator.
The cosmetic chip had an E hardness of 45 and a compression residual strain of -35%.

(Example 3)
Vapor phase metallocene polyethylene resin (Nippon Polyethylene Co., Ltd .: trade name “Harmorex NF-324A”) 10 parts by weight, Metallocene elastomer (Nippon Polyethylene Co., Ltd .: trade name “Kernel KS-240T”) 4 parts by weight Parts, dead glass (particle size 150 mesh) 60 parts, dead glass (particle size 60 mesh) 80 parts, glycerin 6 parts, water-soluble polyethylene glycol (Daiichi Kogyo Seiyaku Co., Ltd. (degree of polymerization 4000)) A cosmetic chip was prepared under the same conditions as in Example 1 using 3 parts by weight, 10 parts by weight of liquid paraffin, and 0.5 parts by weight of a polyethylene glycol nonionic activator.
The cosmetic chip had an E hardness of 38 and a compression residual strain of -35%.

(Comparative Example 1)
Vapor phase metallocene polyethylene resin (Nippon Polyethylene Co., Ltd .: trade name “Harmorex NF-324A”) 10 parts by weight, Metallocene Elastomer (Nippon Polyethylene Co., Ltd .: trade name “Kernel KS-240T”) 4 parts by weight Parts, 75 parts by weight of dead glass (particle size 150 mesh), 55 parts by weight of dead glass (particle size 100 mesh), 6 parts by weight of glycerin, water-soluble polyethylene glycol (Daiichi Kogyo Seiyaku Co., Ltd. (degree of polymerization: 4000)) A cosmetic chip was prepared under the same conditions as in Example 1 except that 3 parts by weight, 10 parts by weight of liquid paraffin, and 0.5 parts by weight of a polyethylene glycol nonionic activator were dried at a drying temperature of 80 ° C. for 24 hours. Produced.
The cosmetic chip had an E hardness of 30 and a compression residual strain of -38%.

(Comparative Example 2)
11 parts by weight of vapor phase metallocene polyethylene resin (Nippon Polyethylene Co., Ltd .: trade name “Harmorex NF-324A”), 2 parts of metallocene elastomer (Nippon Polyethylene Co., Ltd .: trade name “Kernel KS-240T”) Parts, 75 parts by weight of dead glass (particle size 150 mesh), 55 parts by weight of dead glass (100 mesh size), 12 parts by weight of glycerin, water-soluble polyethylene glycol (Daiichi Kogyo Seiyaku Co., Ltd. (degree of polymerization: 4000)) A cosmetic chip was prepared under the same conditions as in Example 1 using 10 parts by weight, 10 parts by weight liquid paraffin, and 0.5 parts by weight of a polyethylene glycol nonionic activator.
The cosmetic chip had an E hardness of 48 and a compression residual strain of -38%.

(Comparative Example 3)
Vapor phase metallocene polyethylene resin (Nippon Polyethylene Co., Ltd .: trade name “Harmorex NF-324A”) 10 parts by weight, Metallocene elastomer (Nippon Polyethylene Co., Ltd .: trade name “Kernel KS-240T”) 5 weights Parts, 75 parts by weight of dead glass (particle size 150 mesh), 55 parts by weight of dead glass (particle size 100 mesh), 10 parts by weight of glycerin, water-soluble polyethylene glycol (Daiichi Kogyo Seiyaku Co., Ltd. (degree of polymerization: 4000)) A cosmetic chip was prepared under the same conditions as in Example 1 using 8 parts by weight, 10 parts by weight of liquid paraffin, and 0.5 parts by weight of a polyethylene glycol nonionic activator.
The cosmetic chip had an E hardness of 15 and a compression residual strain of -40%.

The results are summarized in Table 1.

  Moreover, the skin contact of the cosmetic chip was examined using the cosmetic chips obtained in the examples and comparative examples. The results are shown in Table 2.

(Per skin)
Ten professional panelists were asked to apply the cosmetic chips obtained in each Example and each Comparative Example to their eyelids and examined the skin contact, and evaluated based on the following evaluation criteria.
[Evaluation criteria]
◎: 9-10 out of 10 panelists evaluated that the skin contact was good ○: 7-8 out of 10 panelists evaluated that the skin contact was good △: 5-6 out of 10 panelists said that the skin contact was good Evaluation x: 4 or less of 10 panelists evaluated that the skin contact was good

As a result of performing a test per skin of the obtained cosmetic chip, as shown in Table 2, the cosmetic chips obtained in Examples 1 to 3 had good skin perception. The skin tips of the cosmetic chips obtained in Comparative Examples 1 to 3 were bad.
It has been found that when the E hardness exceeds a predetermined range, the skin contact becomes worse. This is considered due to the blending ratio of the resin. Similarly, it has been found that when the residual compressive strain exceeds a predetermined range, the skin contact becomes worse. This is also considered to be caused by the blending ratio of the resin. Furthermore, it has been found that even when the temperature at the time of drying exceeds a predetermined range, the skin contact becomes worse. Presumably, if the drying temperature is raised too much, the porous elastic body becomes soft and the skin feel is deteriorated. In addition, when the drying temperature is raised too much, the shape recoverability decreases, but this mechanism is not clearly understood.

  In addition, an ultraviolet light resistance test (irradiation for 20 hours) was performed based on JIS L0842 using an ultraviolet auto fade meter (manufactured by Suga Test Instruments Co., Ltd.). In Examples 1 to 3, no discoloration such as yellowing was observed.

The porous porous body for cosmetics obtained by the present invention has good skin contact.
Further, by using a gas phase method metallocene polyethylene resin and a metallocene elastomer as the resin, the resin is not discolored even when subjected to ultraviolet rays or the like, and is very resistant to hydrolysis.
In addition, since the resin pellets are injected to form a molded body, a product having a complicated shape can be produced. For example, a product that can be used for applications such as a cosmetic sponge, a cosmetic chip, and a cosmetic nib Can be manufactured.

Claims (1)

A mixture of a vapor phase metallocene polyethylene resin and a metallocene elastomer as an ethylene-α-olefin copolymer resin is used in an amount of 25 to 40 parts by weight of the metallocene elastomer with respect to 100 parts by weight of the vapor phase metallocene polyethylene resin. Compound ,
粧用porous elastic body of E hardness, characterized in that 35 to 45.