HK1188694A - Make-up filament, make-up brush material using same filament, make-up brush using same material - Google Patents

Abstract

In order to obtain a filament for a make-up brush in which a large number of protrusions are formed across the entire surface of a polyester resin filament, this make-up filament is characterized in that: the polyester resin is polytrimethylene terephthalate and/or polybutylene terephthalate; the polyester resin contains 0.3 to 1.0 wt% of glass particles, which are inorganic particles, having an average grain size of 1 to 2 μm; the thermal conductivity of the glass particles is within a range of 4 to 6 times that of the resin; and protrusions comprising glass particles coated by the resin are formed across the entire surface of the make-up filament.

Description

Monofilament for cosmetic use, brush bristle material for cosmetic use using the monofilament, and cosmetic brush using the bristle material

Technical Field

The present invention relates to a polyester resin monofilament for cosmetics, a cosmetic brush bristle material using the same, and a cosmetic brush using the same, and more particularly, to a polyester resin monofilament for cosmetics containing glass particles, a cosmetic brush bristle material obtained by subjecting the cosmetic monofilament to an alkali treatment to form a rough surface, and a cosmetic brush using the same, which is excellent in the holding property (sweeping property and holding property), transfer property, and feeling of use of a cosmetic material.

Background

Animal hair such as horse hair and goat hair has been used as a hair material of a cosmetic brush in the past, and it is considered that these animal hair have a good skin touch feeling, i.e., a good feeling of use, and further have good holding properties (sweeping properties and holding properties) of a cosmetic such as powder and transfer properties for transferring the cosmetic to the skin. Therefore, various cosmetic brushes using horse hair as a bristle material of the cosmetic brush have been commercialized. The photograph in FIG. 2 is taken with a laser microscope (VK-8710 VK-Analyzer, manufactured by Kenzhi corporation)) of the surface of the horsehair, and it is found that many protrusions are present on the surface of the horsehair. It is considered that the large number of protrusions of the horsehair improves the holding property and transfer property of the cosmetic such as powder.

However, animal hair has disadvantages such as limited supply amount due to natural resources, although it has the above-mentioned advantages, and in recent years, a cosmetic brush bristle material made of synthetic fibers has been proposed as an alternative to animal hair.

For example, patent document 1 proposes a cosmetic brush hair material having a recessed portion on the surface. A process for producing a hollow fiber by melt spinning a mixture of 100 parts by weight of polybutylene terephthalate (PBT) and 5 to 15 parts by weight of an inorganic powder such as silica, talc or silver zeolite having an average particle diameter of 0.5 to 1.0 [ mu ] m, drawing the obtained monofilament 5 to 6 times, and burying the inorganic powder on the surface thereof to form a recess. A cosmetic brush hair material has been proposed in which monofilaments are bundled and cut to a predetermined length, one end side of the obtained fiber bundle is immersed in an alkaline solution, and one end side is dissolved and reduced to form a conical shape while the concave portion is enlarged (see patent document 1). It is disclosed that a bristle material for a cosmetic brush using a monofilament having the recessed portion formed therein has the same holding property and transferability as animal hair because the recessed portion enlarged by alkali treatment on the surface of the monofilament functions similarly to the epidermal layer (cuticle) of animal hair.

Patent document 2 proposes a brush hair material having irregularities on the surface. In order to make the tip portion of the bristle material conical, it is disclosed that by melt-spinning polytrimethylene terephthalate (PTT), bundling monofilaments obtained by drawing the monofilaments 5 to 6 times, immersing the bundled monofilaments at about 10 to 20mm at one end in the longitudinal direction in an alkali treatment solution containing an amine catalyst, and treating the resultant filaments at 110 to 130 ℃ for 1 to 2 hours, it is possible to form 1 to 20 μm unevenness on the surface of the conical tapered portion after the alkali treatment of the monofilaments without blending an inorganic powder (see patent document 2). The single filaments of PTT of examples 1 and 2 of the cosmetic brush hair materials had fineness of 80dtex and 100 dtex.

Documents of the prior art

Patent document

Japanese patent application laid-open No. 2008-109990

Patent document 2 Japanese patent application laid-open No. 2006-141991

Disclosure of Invention

The photograph (fig. 2) of the surface of the horsehair shows that many protrusions are present on the entire surface. If the presence of the convex portion is such that the convex portion is formed on the entire surface of the polyester resin monofilament and then the one end side of the monofilament is formed into a shape similar to the shape of the convex portion of the majority of horse hair by the alkali treatment, the resin monofilament can be used as a cosmetic brush having a good feeling of use similar to that of a cosmetic brush material of horse hair and having good holding properties and transfer properties of a cosmetic material such as powder.

The cosmetic brush hair material made of polyester resin monofilament in patent documents 1 and 2 is a cosmetic brush hair material in which a tapered sharp part is formed on one end side of a monofilament by alkali treatment. However, since the PBT monofilament of patent document 1 is mixed with 5 to 15 parts by weight of inorganic powder and then stretched 5 to 6 times, there is a risk that the monofilament is cut off if the drawing speed, temperature, and the like are not strictly controlled in the drawing step, and further, since the surface of the monofilament is formed with recesses by the alkali treatment, the bristle material is cut off in the region where the recesses in the conical shape face each other. And the fineness of the cosmetic brush hair material of patent document 2 is 80dtex (3.43 mils (1 mil) 1/1000 inch) and 100dtex (3.84 mils). In the thickness of these monofilaments, unevenness of 20 μm or less is provided on one end side by alkali treatment, and there is a risk that the monofilaments are cut in a region where recesses face each other in the middle of the conical shape. In addition, both of the cosmetic brush hair materials have a concave part or a concave-convex part in the conical tapered part of the polyester resin monofilament, and have a shape different from the convex part of the cosmetic brush hair material of horse hair, so that it is difficult to produce a cosmetic brush hair material that functions similarly to the cosmetic brush hair material of horse hair.

In view of the above circumstances, an object of the present invention is to provide a monofilament for a cosmetic brush having a plurality of protrusions formed on the entire surface of a polyester resin monofilament, a cosmetic brush bristle material in which the surface of a conical tapered portion on one end side of the monofilament is subjected to alkali treatment to form a plurality of protrusions and the protrusions are not cut in the middle region of the conical tip end portion, and a cosmetic brush using the cosmetic brush bristle material which has a good feeling of use similar to a horse hair cosmetic brush and is excellent in holding properties and transfer properties of a cosmetic material such as powder.

As a result of intensive studies to solve the above problems, the present inventors have found that by incorporating glass particles having a thermal conductivity 4 to 6 times higher than that of a polyester resin in an amount of 0.3 to 1.0 wt% based on the resin, it has been found that a monofilament of a cosmetic brush having a large number of protrusions formed on the entire surface of a polyester resin monofilament can be produced, and that the monofilament can be provided with a surface treated with an alkali, a region in which the convex portions of the glass particles coated with the resin are formed on one end side of the monofilament and a region in which the convex portions of the glass particles are formed over the entire surfaces of the main body portion and the conical tapered portion in continuous therewith, and are not cut in a region in the middle of the conical tip portion, further, they have found that a cosmetic brush using the above-mentioned hair material has a good feeling of use as well as a cosmetic brush using horse hair, and has good holding properties and transfer properties of a cosmetic material such as powder, and thus completed the cosmetic brush of the present invention.

Namely, the present invention is as follows.

The cosmetic monofilament according to claim 1 is a cosmetic monofilament containing inorganic particles in a polyester resin, wherein the polyester resin is polytrimethylene terephthalate and/or polybutylene terephthalate, the polyester resin contains 0.3 to 1.0 wt% of glass particles having an average particle diameter of 1 to 2 μm as the inorganic particles, the glass particles have a thermal conductivity in a range of 4 to 6 times that of the resin, and protrusions of the glass particles coated with the resin are formed on the entire surface of the cosmetic monofilament.

The cosmetic monofilament according to claim 2, wherein the glass particles have a thermal conductivity of 1.38 to 1.50W/m · K.

The cosmetic monofilament according to claim 3, wherein the glass particles are E glass, silica glass, or silver glass.

The cosmetic monofilament according to claim 4 is characterized in that the fineness of the cosmetic monofilament is 2 to 4 mils.

A cosmetic brush material according to claim 5, wherein one end side of a cosmetic monofilament containing inorganic particles in a polyester resin is treated with an alkali to form a main body and a tapered tip portion, wherein the polyester resin is polytrimethylene terephthalate and/or polybutylene terephthalate, the polyester resin contains 0.3 to 1.0 wt% of glass particles having an average particle diameter of 1 to 2 μm as the inorganic particles, the glass particles have a thermal conductivity in a range of 5 to 7 times that of the resin, and a region where a convex portion of the glass particles coated with the resin is formed on the entire surface of the cosmetic monofilament and a region where the convex portion of the glass particles is formed on the entire surface of the main body and the tapered tip portion in contact with the region are provided.

The cosmetic brush hair material according to claim 6, characterized in that a convex portion having a height of 1.0 to 1.5 μm of the glass particles is formed on the entire surface of the body portion.

The cosmetic brush hair material according to aspect 7 is characterized in that the glass particles have a thermal conductivity of 1.38 to 1.50W/m.K.

The cosmetic brush hair material according to aspect 8, wherein the glass particles are E glass, silica glass, or silver glass.

The cosmetic brush hair material according to claim 9, wherein the diameter of the conical distal end is in the range of 10 to 25 μm.

The cosmetic brush hair material according to aspect 10, characterized in that the distribution density of the convex portions of the main body portion of the cosmetic brush hair material is in the range of 20 to 65 per 50 μm 2.

The makeup brush hair material according to claim 11 is characterized in that the fineness of the makeup monofilament is 2 to 4 mils.

The makeup brush base material according to claim 12, wherein the bacteriostatic activity value of the makeup brush base material in which the glass particles are silver glass is in the range of 4 to 6.

A cosmetic brush according to claim 13, which is a cosmetic brush using a cosmetic brush material in which one end side of a cosmetic monofilament containing inorganic particles in a polyester resin is subjected to an alkali treatment to form a main body and a tapered tip portion, wherein the polyester resin is polytrimethylene terephthalate and/or polybutylene terephthalate, the polyester resin contains 0.3 to 1.0 wt% of glass particles having an average particle diameter of 1 to 2 μm as the inorganic particles, the glass particles have a thermal conductivity in a range of 4 to 6 times that of the resin, a region in which a convex portion of the glass particles coated with the resin is formed over the entire surface of the cosmetic monofilament, a region in which the convex portion of the glass particles is formed over the entire surface of the main body and the tapered tip portion is continuous with the region, and the cosmetic brush material used in the cosmetic brush in which the main body and the tapered tip portion are coated with a cosmetic material is used for a foundation Brushing, whitewashing, eye shadow brushing, lip brushing, or shadow brushing.

The cosmetic brush according to claim 14, wherein the projections having a height of 1.0 to 1.5 μm of the glass particles are formed on the entire surface of the body.

The cosmetic brush according to claim 15, wherein the glass particles have a thermal conductivity of 1.38 to 1.50W/m · K.

The cosmetic brush according to claim 16, wherein the glass particles are E glass, silica glass, or silver glass.

The cosmetic brush according to aspect 17, wherein the diameter of the conical distal end is in the range of 4 to 15 μm.

The cosmetic brush according to aspect 18, wherein the distribution density of the protrusions of the main body portion is in the range of 20 to 65 per 50 μm 2.

The makeup brush according to claim 19, characterized in that the fineness of the makeup monofilament is 2 to 4 mils.

The cosmetic brush according to aspect 20 is characterized in that the antibacterial activity value of the cosmetic brush bristle material in which the glass particles are silver glass is in a range of 4 to 6.

The cosmetic monofilament of the present invention is a monofilament in which a protrusion of glass particles coated with a polyester resin is formed on the entire surface of the cosmetic monofilament by adding glass particles in an amount of 0.3 to 1.0 wt% in a range of 5 to 7 times as large as the thermal conductivity of the resin to PTT and/or PBT that is a polyester resin.

The cosmetic brush bristle material of the present invention can be produced by providing a brush bristle material having a region in which a convex portion of glass particles coated with the resin is formed over the entire surface of the cosmetic monofilament by alkali treatment on one end side of the cosmetic monofilament and a region in which the convex portion of the glass particles is formed over the entire surface of the body portion and the conical tapered portion in continuous with the region, and the brush bristle material is not cut in a region in the middle of the conical tip portion. In particular, a plurality of projections having a height of 1.0 to 1.5 μm of the glass particles can be formed on the entire surface of the body.

The cosmetic brush of the present invention using the above cosmetic brush bristle material has a good feeling of use as well as the cosmetic brush bristle material of horse hair, and has good holding properties and transfer properties of a cosmetic material such as powder.

Furthermore, the makeup brush hair material and the makeup brush containing 0.3-1.0 wt% of silver glass as glass particles have the convex parts of the silver glass on the whole surface of the hair material, so the antibacterial property and the deodorization property are excellent.

Drawings

FIG. 1 is a longitudinal sectional view of an extruder for pellet molding containing glass particles as a material for the cosmetic brush bristle material of the present invention.

Fig. 2 is a photograph of the surface of the tail hair of horse hair.

FIG. 3 is a photograph showing the surface of the main body of a 3 mils monofilament containing 1 wt% of glass particles in PTT.

FIG. 4 is a photograph showing the surface of a main body portion of a 3 mils monofilament containing 1 wt% glass particles in PTT after alkali treatment.

FIG. 5 is a photograph showing the surface of the main body of a 3 mils monofilament containing 0.5 wt% of glass particles in PTT.

FIG. 6 is a photograph showing the surface of a main body portion of a PTT subjected to alkali treatment of a monofilament containing 0.5 wt% of glass particles.

The right photograph in fig. 7 is a photograph of the surface of the main body portion of a 3 mils monofilament containing 1 wt% of glass particles in PTT alkali-treated, and the left photograph in fig. 7 is a photograph of the surface of the tip portion of the conical tapered portion subjected to the alkali treatment.

Description of the symbols

1-an extruder; 2-an electric motor; 3-a reducer; 4-screw rod; 5-heating the blower; 6-screw thread; 7-a perforated plate; 8-nozzle mould; 9-the 1 st hopper; 9' -material particles; 10-2 nd hopper; 10' -E glass powder.

Detailed Description

(thermoplastic resin)

As polyester resins used for cosmetic brush materials, polytrimethylene terephthalate (hereinafter referred to as "PTT") and polybutylene terephthalate (hereinafter referred to as "PBT") are exemplified from the viewpoint of physical properties such as flexibility, elastic recovery, and water resistance. The PTT alone, the PTT and the PBT in combination, or the PBT alone can be used.

(glass particles)

Examples of the glass particles contained in the resin used for the cosmetic brush material include E glass, silver glass, and silica glass. The thermal conductivity of E glass was 1.50W/m.K, and the thermal conductivity of silver glass was a value having a magnitude centered around a thermal conductivity of 1.40W/m.K depending on the material blended. The silver glass used in the examples was a silver glass having a value of 1.40W/m.K. The thermal conductivity of the silica glass was 1.38W/m.K, and the thermal conductivity was a value having a range other than 1.38W/m.K depending on the material.

The polyester resin contains glass particles in an amount of 0.3 to 1.0 wt%. When the compounding ratio is 0.3 wt% or less, the height of the glass particles protruding over the entire surface of the sharp portion of the monofilament is not more than 1.0 μm, which is not preferable. When the blending ratio is 1.0 wt% or more, the monofilament is cut during the drawing, and therefore, it is preferable to blend glass particles in the resin in a range of 0.3 to 1.0 wt%.

The methods for producing E glass, silica glass and silver glass are well known and therefore omitted.

(method for producing pellets containing glass particles)

A method for producing pellets in which glass particles are contained in the above resin, which is a material of the cosmetic brush bristle material of the present invention, will be described.

The pellets were produced by using a conventional extruder having 2 kinds of hoppers as shown in fig. 1.

Reference numeral 1 denotes an extruder, reference numeral 2 denotes a motor, reference numeral 3 denotes a decelerator, reference numeral 4 denotes a screw, reference numeral 5 denotes a heating blower, reference numeral 6 denotes a screw thread, reference numeral 7 denotes a perforated plate, reference numeral 8 denotes a nozzle die, reference numeral 9 denotes a 1 st hopper, reference numeral 9 'denotes pellets, reference numeral 10 denotes a 2 nd hopper, and reference numeral 10' denotes E glass powder.

The extruder 1 includes pellets 9 'of the resin as a supply material and 2 hoppers for charging the E glass powder 10'. The hoppers of the extruder 1 shown in fig. 1 are referred to as a 1 st hopper 9 and a 2 nd hopper 10 in this order from the left side, and pellets 9 'of the resin are charged into the 1 st hopper 9, and glass particles 10' are charged into the 2 nd hopper 10 provided in the vicinity of the intermediate portion of the extruder. The 2 nd hopper 10 is disposed at a position in a region where pellets 9' supplied from the 1 st hopper 9 into the screw cylinder are in a molten state as kneading and conveying are performed by the screw 4.

The weight of the supplied pellets 9 'is measured based on the determined mixing ratio of the resin and glass particles, and the measured weight of the glass particles 10' is charged into the 1 st hopper 9, and the pellets 9 conveyed by kneading and conveying by the screw 4 are melted by a heater, that is, the 2 nd hopper is disposed at a position where the 2 nd hopper is disposed. The glass particles 10 ' put into the molten resin are extruded while being kneaded to form a molded product containing the glass particles 10 ', and then cut to obtain pellets containing the glass particles 10 '. The temperature of the heater is determined according to the melting point of the resin used.

Since the extruder of fig. 1 has the same structure as a conventional extruder except for the hopper structure, the description of the structure of the extruder of fig. 1 is omitted.

(method for producing cosmetic Brush Hair Material)

Next, a method for producing a cosmetic brush hair material according to the present invention will be described.

The monofilament of the cosmetic brush hair material is produced by melt-spinning pellets containing glass particles.

The pellets containing the glass particles are dried, put into a spinning machine, melted, kneaded, extruded, spun from a spinning nozzle, and subjected to 3-stage heating and drawing to 4 to 5-fold draw, thereby producing 3 mils monofilaments. The protrusions of the glass particles coated with the polyester resin were formed on the entire surface of the monofilament. The monofilament is gathered into a cylindrical shape, cut into a predetermined length, and subjected to alkali treatment with an aqueous sodium hydroxide solution at one cut end, washed with water, and dried.

One end of the monofilament is immersed in an alkaline treatment solution, and a region in which a protruding portion of glass particles having a conical shape appears in the tip direction of one end side due to the weight loss caused by hydrolysis of the resin is referred to as a "conical tapered portion", and a region in which the glass particles appear on the entire surface of the main body of the monofilament is referred to as a "main body portion" by sucking the sodium hydroxide aqueous solution by capillary action on the monofilament bundled in a cylindrical shape and dissolving and removing the resin covering the protruding portion of the glass particles. Therefore, the cosmetic brush hair material of the present invention is provided with a region in which the convex portions of the glass particles coated with the resin are formed on the entire surface of the cosmetic monofilament, and a region in which the convex portions of the glass particles are formed on the entire surfaces of the main body portion and the conical tapered portion in continuous with the region.

The cosmetic brush of the present invention applies a cosmetic material such as foundation to the region of the convex portion of the glass particle (the main body portion and the conical tapered portion).

Examples

PTT (SORONA J2240Semi-Dull; product of Du Pont) is charged into the hopper 1 of an extruder, and glass particles (having an average particle diameter of 1 to 2 μm) are injected from the hopper 2 while being measured during melting at 270 ℃, and extruded by using a screw in which a stirring and kneading zone is sufficiently set, to produce pellets containing the glass particles.

The pellets are dried at 110 ℃ and then fed into a spinning machine, melted at 270 ℃, kneaded at 250 ℃ and extruded, spun from a spinning nozzle, and drawn by 4 to 5 times by 3 stages of heating and drawing to produce 3 mils monofilaments. The monofilaments were bundled into a cylindrical shape having a diameter of 5cm and cut into pieces having a length of 6 cm. One end of the monofilament bundle is dipped in a 12 wt% sodium hydroxide aqueous solution at 120 ℃, the dipping part of the dipped monofilament bundle is gradually increased with time, the dipping time is up to 120 minutes, and the dipping time is adjusted to hydrolyze the top end of the monofilament bundle into the thickness of 10-25 μm, thereby forming the conical tapered part. The bundled monofilament above the impregnated portion of the bundle of monofilaments absorbs the aqueous sodium hydroxide solution by capillary action, and dissolves and removes the resin covering the protruding portions of the glass particles on the surface of the monofilament to form the main body. The main body can be adjusted to freely change the width of the monofilament by adjusting the strength of the monofilament gathered. Then washed with water and dried to obtain the cosmetic brush hair material.

When a monofilament of 3 mils (76 μm) is treated with alkali to form a tip into a conical shape of 10 to 25 μm, glass particles may be cut from the portion where the mixing is not uniform, and it is very important to sufficiently perform kneading at the mixing.

Examples 1 to 8 (PTT)

Pellets containing glass particles having different glass particle content were produced by the above-described production method, and the cosmetic brush materials of examples 1 to 8 below were produced by melt spinning.

Specifically, a monofilament in which 0.3 wt% (example 1), 0.4 wt% (example 2), 0.5 wt% (example 3), and 1.0 wt% (example 4) of E glass particles were blended in PTT was drawn 4 to 5 times under the above conditions to produce a monofilament having a fineness of 3 mils. Furthermore, monofilaments containing 0.3 wt% (example 5), 0.4 wt% (example 6), 0.5 wt% (example 7) and 1.0 wt% (example 8) of silver glass particles were drawn 4 to 5 times under the above conditions to produce monofilaments having a fineness of 3 mils. The filaments are subjected to the alkali treatment to form a main body portion and a tapered portion.

Comparative example 1

Comparative example 1 is a case where the above alkali treatment was performed on a monofilament of PTT containing no glass particles to form a main body portion and a conical tapered portion.

Examples 9 to 12 (PBT)

PBT (TORAYCOM 1401X06 Toray corporation) was charged into the hopper 1 of an extruder, and glass particles (having an average particle diameter of 1 to 2 μm) were injected from the hopper 2 while being metered during melting at 270 ℃ and extruded by using a screw having a sufficiently set kneading zone to produce pellets containing the glass particles.

The monofilament, the body and the conical tapered portion were produced in the same manner as in examples 1 to 8.

Pellets containing glass particles having different glass particle contents were produced by the above-described production method, and the cosmetic brush materials of examples 9 to 12 below were produced by melt spinning.

Specifically, a monofilament in which 0.3 wt% (example 9), 0.4 wt% (example 10), 0.5 wt% (example 11), and 1.0 wt% (example 12) of silver glass particles were blended in PBT was drawn 4 to 5 times under the above-described conditions to produce a monofilament having a fineness of 3 mils. The monofilament is subjected to the alkali treatment described above to form a tapered portion.

(comparative example 3)

Comparative example 3 is a case where the above alkali treatment was performed on a monofilament of PBT containing no glass particles to form a main body portion and a conical tapered portion.

Fig. 2 to 7 show 1000-fold photographs of the surface of the horse hair and the surface of the monofilament serving as the cosmetic brush hair material, which were taken with a laser microscope (VK-8710 VK Analyzer (manufactured by kirschner). The photographs in fig. 3 and 5 show the surface of the monofilament before the alkali treatment. The surface shape of the convex portion of the horsehair may be described as comparative example 2.

The photograph of the surface of the horsehair tail in FIG. 2 shows that many protrusions are present on the surface.

The surface photograph of the main body portion of PTT containing 1 wt% of silver glass particles in fig. 3 shows that only very few low protrusions exist on the surface.

The surface photograph of the alkali-treated main body portion containing 1 wt% of silver glass particles in PTT of fig. 4 shows that a large number of convex portions of the silver glass particles are present on the surface.

The surface photograph of the main body portion of PTT containing 0.5 wt% of silver glass particles in fig. 5 shows that only very few low protrusions were present on the surface.

The surface photograph of the alkali-treated main body portion containing 0.5 wt% of silver glass particles in PTT of fig. 6 shows that many projections of glass particles are present on the surface, but the height of the projections is lower than that of fig. 4.

A surface photograph of the tip end portion of the conical tapered portion subjected to the alkali treatment on the left side of FIG. 7 shows that the tip end portion of the conical tapered portion reduced by hydrolysis of the polyester resin has a fine thickness of 10 to 25 μm having a convex portion of glass particles, as compared with the coarse thickness of the 76 μm main body portion not subjected to the alkali treatment on the right side of FIG. 7.

The photographs of fig. 2 to 7 show that the cosmetic brush hair material is formed with a large number of projections of glass particles on the entire surface of the main body portion and further on the entire surface of the conical tapered portion by the alkali treatment, and the projections are shaped like the surface of horse hair.

The heights and distributions of the convex portions on the surfaces of the body portions of the cosmetic brush materials of examples 1 to 4 (PTT containing E glass), examples 5 to 8 (PTT containing silver glass), and examples 9 to 12 (PBT containing silver glass) were measured by a laser microscope (VK-8710 VK-Analyzer (manufactured by keyence corporation)), and the thicknesses of the tip portions of the conical tapered portions were measured. The height, distribution and thickness of the cosmetic brush bristle material (PTT) containing E glass particles are shown in table 1, the height, distribution and thickness of the cosmetic brush bristle material (PTT) containing silver glass particles are shown in table 2, and the height, distribution and thickness of the cosmetic brush bristle material (PBT) containing silver glass particles are shown in table 3.

TABLE 1

Table 1 shows that the height of the convex portions of the horse hair in examples 1 to 4 is about 1/2, because the height of the convex portions of the horse hair is 1.1 to 1.5 μm and the height of the convex portions of the horse hair is 2.6 μm, respectively, with respect to the PTT of examples 1 to 4. Further, table 1 also shows that, since the distribution of the convex portions of the horsehair is 26 to 65 per 50 μm2 and the distribution of the convex portions of the horsehair is 28 per 50 μm2 with respect to examples 1 to 4, the distribution of the convex portions of examples 1 and 2 is similar to the distribution of the convex portions of the horsehair, and shows that the distribution of the convex portions of the horsehair increases as the content of the E glass of examples 3 and 4 increases.

Further, as shown in Table 1, the thicknesses of the top ends of the examples 1 to 4 (PTT) were 10 to 25 μm, and the thicknesses of the top ends of the horse hair were 10 to 30 μm, the thicknesses of the top ends of the examples 1 to 4 (PTT) were similar to the thicknesses of the top ends of the horse hair.

TABLE 2

As is apparent from Table 2, in examples 5 to 8 (PTT), since the values of the height and distribution of the convex portions and the thickness of the conical portion were almost the same, the shapes of the E glass particles-containing cosmetic brush materials and the silver glass particles-containing cosmetic brush materials were shown to have almost the same height, distribution and thickness of the tip portions.

However, in example 8, the tip end portion having the content of 1.0 wt% produced a cosmetic brush hair material having a thickness of 45 μm of 15%. The thickness of the tip portion is usually 2 times or more as large as the normal thickness, and is an abnormal thickness. The monofilament having a diameter of 76 μm and a thickness of 45 μm at the tip end portion formed by the alkali treatment was an abnormal thickness because the fineness of the monofilament was 3 mils, and when the monofilament having the above thickness was contained in the cosmetic brush, the hair thereof irritated the skin, which was a serious drawback.

This abnormal thickness occurs in a region where glass particles are unevenly contained because the glass particles are subjected to alkali treatment in an unevenly contained state when the glass particles are injected from the 2 nd hopper and kneaded by a screw. Therefore, by paying attention to the kneading conditions of the glass particles, the glass particles are made uniform, and the incidence of the above-mentioned fineness abnormality can be reduced.

The bacteriostatic activity values of Table 2 are values of the antibacterial activity test of Staphylococcus aureus based on the standard of JIS (Japanese Industrial Standard) L1902-1998 (ISO 20743).

The test results showed that the antibacterial activity value of staphylococcus aureus measured was in the range of 4 to 6, and it was found that excellent antibacterial activity was obtained. In the above criteria, as long as the bacteriostatic activity value is a value of 2.2 or more, that is, the bacteriostatic activity value is determined to exceed the antibacterial/deodorant criteria, the value in the range of 4 to 6 of the bacteriostatic activity value is far beyond the value.

The cosmetic brush is a problem to be solved by the user that the brush is in contact with the skin, which causes the skin resident bacteria, water bacteria (Achlyacrenula Ziegler), to adhere to the brush, and the bacteria proliferate to generate unpleasant odor. When 99% of the bacteria are sterilized, no odor will be perceived. The 99% sterilization of the bacterium means that the bacteriostatic activity value shows a value of 2.2. However, the cosmetic brush hair materials of examples 5 to 8 exhibited bacteriostatic activity values in the range of 4 to 6, and it was found that bacteria were killed in a shorter time than the bacteriostatic activity value of 2.2, and the generation of odor was rapidly prevented. Since the top end portions of the cosmetic brush bristle materials of examples 5 to 8 had 1.0 to 1.5 μm silver glass projections with a distribution density of 21 to 64/50 μm2 on the entire surface, they were excellent in antibacterial and deodorant properties against skin resident bacteria and water bacteria.

TABLE 3

Examples 9 to 12 are cosmetic brush hair materials containing 0.3, 0.4, 0.5 and 1.0 wt% of silver glass in PBT.

In table 3, since the values of the height, distribution, and thickness of the tip end portions of the protrusions of examples 9 to 12 (PBT) were substantially the same as those of the protrusions of examples 5 to 8 (PTT), both the cosmetic brush material containing silver glass particles in PTT and the cosmetic brush material containing silver glass particles in PBT showed substantially the same shapes of height, distribution, and thickness.

As a result, it was found that the polyester-based resin may be PTT or PBT, and the height of the convex portions, the distribution of the convex portions, and the thickness of the tip portion of the cosmetic brush bristle material containing PTT or PBT containing glass particles were substantially the same.

Moreover, the cosmetic brush hair materials of examples 9 to 12 exhibited bacteriostatic activity values in the range of 4 to 6, and were able to kill bacteria in a shorter time and rapidly prevent the generation of odor, as compared with the bacteriostatic activity value of 2.2.

TABLE 4

Examples 13 to 16 are cosmetic brush hair materials containing 0.3, 0.4, 0.5 and 1.0 wt% of silver glass in a resin in which 60 wt% of PTT and 40 wt% of PBT are mixed.

In table 4, since the values of the height, distribution, and thickness of the tip end portion of the protrusions of examples 1 to 8 (PTT) and 9 to 12 (PBT) were substantially the same as those of examples 13 to 16 (resin in which PTT and PBT were mixed), both the cosmetic brush material containing silver glass in PTT or PBT and the cosmetic brush material containing silver glass in PTT and PBT showed substantially the same shapes of height, distribution, and thickness. It was thus found that the polyester-based resin may be PTT or PBT, and that even when PTT and PBT are mixed, the height of the projections, the distribution of the projections, and the thickness of the tip portion of the glass particle-containing cosmetic brush material are substantially the same.

Moreover, the cosmetic brush hair materials of examples 13 to 16 exhibited bacteriostatic activity values in the range of 4 to 6, and were able to kill bacteria in a shorter time than the bacteriostatic activity value of 2.2, thereby rapidly preventing the generation of odor.

(results of use test)

Using the wool materials of examples 5 to 8 (PTT) and comparative examples 1 and 2, which were prepared by blending silver glass, the results of 5 use tests were evaluated on a scale of 5 of 1 to 5 for the foundation liquid brushing and the brushing. The results of the evaluation of the liquid foundation plastering are shown in Table 5, and the results of the evaluation of the plastering are shown in Table 6.

The evaluation of grade 5 was evaluated with "5" as excellent, "4" as excellent, "3" as normal, "2" as poor, and "1" as extremely poor.

The results of evaluation of 5 kinds of use tests on the rendering of examples 9 to 12 (PBT) containing silver glass are shown in Table 7.

TABLE 5

TABLE 6

TABLE 7

Compared with 100% of PTT of comparative example 1 or 100% of PBT of comparative example 3, the liquid and powder cosmetic materials have remarkably improved holding property and transfer property, and are excellent in functionality and feeling of use.

The feeling was poor when 1.0 wt% was blended, and it is considered that the limit of the blending ratio of the glass particles was 1.0 wt% even when kneading at the time of blending the glass particles was increased because the cosmetic brush bristle material was cut in the middle of the conical tip portion by alkali treatment and the tip portion was extremely coarse.

(mechanism of action of formation of convex part)

Here, the mechanism of action of forming a protrusion of glass particles coated with a polyester resin on the entire surface of a monofilament obtained by melt-spinning and drawing a pellet containing glass particles 4 to 5 times as much as possible and forming a protrusion on the surface of the tip end of the monofilament by alkali treatment was studied.

The thermal conductivity of the glass particles (silica glass, silver glass and E glass) is 1.38 to 1.50W/mK, and the thermal conductivity of the polyester resin (PTT and PBT) is 0.27W/mK, which is 5.1 to 5.6 times, i.e., the thermal conductivity is 5 to 7 times larger than that of the polyester resin.

However, patent document 1 describes that a concave portion is formed on the surface of a cosmetic brush hair material containing inorganic powder (silver zeolite). The thermal conductivity of PBT, which is a material of the brush hair material, was 0.27W/m.K, and the thermal conductivity of silver zeolite was 0.58W/m.K, and it was found that the difference was small.

In the step of stretching the resin containing glass particles extruded from the spinning port 4 to 5 times by 3 stages of heating and stretching, the glass particles present on the surface of the resin are heated with a thermal conductivity about 5 times that of the resin, so that the resin around the glass particles is heated and softened more rapidly than other resins. The rapidly heated and softened resin is stretched first, and the glass particles float upward to form convex portions. The surface of the projection is coated with a resin, but the resin is removed by alkali treatment to make the projection have a more protruding height. It is important that the content of the glass particles is in the range of 0.3 to 1.0 wt%. When the amount is 0.3 wt% or less, the height of the projection is not more than 1.0 μm, which is not preferable. If the amount is 1.0 wt% or more, the cosmetic brush material may contain an alkali-treated conical tapered portion which is cut halfway, and the tip portion may have an abnormal thickness, and the cosmetic brush may be used with a poor feeling.

On the other hand, in the step of drawing the silver zeolite-containing cosmetic brush bristle material of patent document 1 by 4 to 5 times by 3-stage heating and drawing, when the monofilament is spun and heated and drawn, the molecular chains of the PBT fiber are oriented in the fiber axis direction, and the fiber cross-sectional area is reduced. In this drawing step, a tensile force acts in the fiber axis direction, a contraction force acts in the center direction of the fiber cross section, and the thermal conductivity of the silver zeolite does not greatly differ from that of PBT.

Example and cosmetic Brush for horse wool

The surface of the cosmetic brush bristle material of the examples was formed with a large number of projections of glass particles, and thus was similar to horse hair in shape. As a result of the height of the convex portions, the distribution thereof, and the thickness of the top end portion in tables 1 to 4, the height of the convex portions was about 1/2, the distribution of the convex portions was similar to or higher than that of the convex portions of the horse hair, and the thickness of the top end was similar to that of the top end of the horse hair. The above-described hair material of the embodiment is about 1/2 of the height of the convex portion of the horsehair, but the distribution of the convex portion and the thickness of the tip portion are similar. The results in tables 5 to 7 show that the liquid foundation brush and the brush using the hair material can be used as makeup brushes which can replace horse hair, similar to the holding property, the transfer property and the use feeling of horse hair cosmetics. In addition, in the cosmetic brush with the glass particles made of silver glass, the convex parts are formed by the silver glass, so the cosmetic brush shows a value of the bacteriostatic activity value of 4-6, and has excellent antibacterial property and deodorization property.

Claims (20)

1. A cosmetic monofilament comprising a polyester resin and inorganic particles, characterized in that,

the polyester resin is polytrimethylene terephthalate and/or polybutylene terephthalate, the polyester resin contains 0.3-1.0 wt% of glass particles with the average particle diameter of 1-2 μm as the inorganic particles, the thermal conductivity of the glass particles is 5-7 times of the resin, and the convex parts of the glass particles coated by the resin are formed on the whole surface of the cosmetic monofilament.

2. The cosmetic monofilament as claimed in claim 1, wherein the glass particles have a thermal conductivity of 1.38 to 1.50W/m-K.

3. Cosmetic monofilament according to claim 2, characterized in that the glass particles are E glass, silica glass or silver glass.

4. The cosmetic monofilament according to claim 3, wherein the fineness of the cosmetic monofilament is 2 to 4 mils.

5. A cosmetic brush hair material comprising a cosmetic monofilament containing inorganic particles in a polyester resin and an alkali treatment applied to one end side of the cosmetic monofilament to form a main body and a tapered tip portion,

the polyester resin is polytrimethylene terephthalate and/or polybutylene terephthalate, the polyester resin contains 0.3-1.0 wt% of glass particles with the average particle diameter of 1-2 μm as the inorganic particles, the glass particles have the thermal conductivity of 5-7 times of the resin, and a region where the convex parts of the glass particles coated by the resin are formed on the whole surface of the cosmetic monofilament and a region where the convex parts of the glass particles are formed on the whole surface of the main body part and the conical sharp part and are connected with the region are arranged.

6. The cosmetic brush hair material as defined in claim 5, wherein a convex portion having a height of 1.0 to 1.5 μm of the glass particles is formed on the entire surface of the body portion.

7. The cosmetic brush bristle material according to claim 5 or 6, wherein the glass particles have a thermal conductivity of 1.38 to 1.50W/m-K.

8. The cosmetic brush blank according to claim 7, wherein the glass particles are E glass, silica glass, or silver glass.

9. The cosmetic bristle material of claim 8, wherein the diameter of the conical tip is in the range of 10 to 25 μm.

10. The cosmetic brush hair material according to claim 9, wherein the distribution density of the convex portions of the main body portion of the cosmetic brush hair material is in the range of 20 to 65 per 50 μm 2.

11. The cosmetic brush hair material as set forth in claim 10, wherein the fineness of the cosmetic monofilament is 2 to 4 mils.

12. The cosmetic brush bristle material according to claim 8, wherein the cosmetic brush bristle material with the glass particles made of silver glass has a bacteriostatic activity value in the range of 4 to 6.

13. A cosmetic brush using a cosmetic brush bristle material in which one end side of a cosmetic monofilament containing inorganic particles in a polyester resin is treated with alkali to form a main body portion and a tapered tip portion,

the polyester resin is polytrimethylene terephthalate and/or polybutylene terephthalate, the polyester resin contains 0.3-1.0 wt% of glass particles with the average particle diameter of 1-2 μm as the inorganic particles, the glass particles have the thermal conductivity of 5-7 times of the resin, a region where the convex parts of the glass particles coated by the resin are formed on the whole surface of the cosmetic monofilament and a region where the convex parts of the glass particles are formed on the whole surface of the main body part and the conical tip part in a continuous manner with the region are arranged, and the cosmetic brush hair material used in the brush for coating the main body part and the conical tip part with the cosmetic material is used for a foundation brush, a powder brush, an eye shadow brush, a lip brush or a shadow brush.

14. The cosmetic brush as defined in claim 13, wherein the projections having a height of 1.0 to 1.5 μm are formed on the entire surface of the body portion.

15. The cosmetic brush as defined in claim 13 or 14, wherein the glass particles have a thermal conductivity of 1.38 to 1.50W/m-K.

16. The cosmetic brush as defined in claim 15, wherein the glass particles are E glass, silica glass, or silver glass.

17. The cosmetic brush as defined in claim 16, wherein the conical tip has a diameter in the range of 4 to 15 μm.

18. The cosmetic brush as defined in claim 17, wherein the distribution density of the convex portions of the main body portion is in the range of 20 to 65 per 50 μm 2.

19. The cosmetic brush as defined in claim 18, wherein the cosmetic monofilament has a fineness of 2 to 4 mils.

20. The cosmetic brush according to claim 16, wherein the cosmetic brush base material in which the glass particles are silver glass has a bacteriostatic activity value in the range of 4 to 6.