KR20190021786A - Polyketone toothbrush bristles and toothbrush using the same - Google Patents

Abstract

The present invention relates to a polyketone bristle and a toothbrush using the same and, more specifically, to a polyketone bristle of a complex structure having a double structure or a multiple structure by comprising a polyketone resin, and to a toothbrush using the same. In addition, the variant bristle using polyketone is highly durable.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyketone bristle and a toothbrush using the same. BACKGROUND OF THE INVENTION [0002]

The present invention relates to a polyketone bristle and a toothbrush using the same. Specifically, the present invention relates to a polyketone bristle having a double structure or a multiple structure including a polyketone resin, and a toothbrush using the same. More specifically, the present invention relates to a highly durable bristle brush using polyketone.

The toothbrush comprises a bristle, a head portion on which the bristles are put, and a handle portion connected to the head portion. The bristles implanted in the head portion of the toothbrush not only have to have constant strength and elasticity, but also must be able to move easily along the tooth, which is the portion to be brushed.

Conventionally, bristles have been made of a material such as a polyester resin and a polyamide resin. However, there are inconveniences that the bristles are worn by the user and the toothbrush is frequently replaced. Accordingly, there has been a demand for bristles having high durability, improved cleaning ability, and excellent flexibility.

It is an object of the present invention to provide a toothbrush which can further improve the cleaning power, durability and heat resistance of bristles by using a polyketone resin, exhibit excellent resistance to most chemical substances, have chemical resistance and have abrasion resistance equal to or higher than that of polyacetal, It is an object of the present invention to provide a brush bristle having a tooth cleaning ability which is further increased in spite of long-term use, and a toothbrush using the same.

The present invention also relates to a bristles of a composite structure having a double structure or a multiple structure by extruding a polyketone resin and a thermoplastic resin together to give flexibility to the bristles while using the rigidity and durability of the polyketone as they are, The purpose is to provide.

It is another object of the present invention to provide a bristle having a tooth cleaning ability which is further increased despite its use for a long period of time, and which has a soft touch, and a toothbrush using the same.

Further, in the case of using a toothbrush including polyketone as a core part, the present invention expands the core part including the polyketone while the sheath part is worn out for a long period of use, so that the surface area is further increased by various forms of the core part, And to provide a toothbrush manufactured using the same.

Another object of the present invention is to provide a brush bristle including a functional additive and exhibiting various functions together, and a toothbrush using the bristle.

According to an aspect of the present invention, there is provided a polyolefin resin composition comprising a core portion extending in one direction and a sheath portion surrounding the core portion, wherein at least one selected from the core portion and the sheath portion comprises a polyketone resin. It is a ketone bristle.

In one aspect of the present invention,

(I) at least one bar shape penetrating the inside of the sheath

(Ii) a shape comprising a bar-shaped central portion passing through the interior of the sheath and a wing portion extending outwardly from the central portion, and

Iii) a shape including a bar-shaped central portion passing through the inside of the sheath and a wing extending outwardly from the central portion, and a frictional protrusion formed at an end of the wing portion and projecting to the outside of the sheath portion

, And the like.

In an aspect of the present invention, in the above-mentioned mode ii), the wing portion may be a plurality of wings extending to the edge of the sheath portion and disposed radially with respect to the center portion.

In one embodiment of the present invention, in the iii) mode, the friction protrusion may be formed so as to surround a part of an edge of the sheath portion.

In one aspect of the present invention, the core portion and the sheath portion may each be selected from a circle, an ellipse, a dumbbell, a semi-circle, a fan, a gull, and a polygon.

In one aspect of the present invention, the polygon may be selected from triangular, square, pentagonal, hexagonal, star, cross, and rhombic.

In one aspect of the present invention, the core portion and the sheath portion may be made of different materials.

In one embodiment of the present invention, the core portion includes a polyketone resin, and the sheath portion may include any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer, and a rubber.

In one embodiment of the present invention, at least one selected from the core portion and the sheath portion may further comprise a functional material.

In one embodiment of the present invention, the functional material is selected from the group consisting of sodium carbonate powder, sodium hydrogen carbonate powder, natural extract, silver powder, gold powder, zeolite, carbon particles, ilite, bentonite, titanium oxide, antimicrobial agent, , Bamboo salt powder, jade powder, volcanic clay powder, citrus charcoal powder, photocatalyst, pigment, and dye, or a mixture of two or more thereof.

In one aspect of the present invention, the diameter of the sheath may be 0.02 to 0.3 mm, and the diameter ratio of the core and sheath may be 1: 1.2 to 1: 5.

In one aspect of the present invention, the total length of the bristles may be 10 to 40 mm.

Another aspect of the present invention is a toothbrush comprising the polyketone bristles.

The present invention can provide a bristles having durability, abrasion resistance, heat resistance and chemical resistance as compared with bristles not containing a polyketone resin by providing a bristle composed of a composite structure of a double structure or a multiple structure including a polyketone resin have.

In addition, when the polyketone resin is contained in the core portion, the sheath portion is exposed to expose the core portion, and the surface area can be further increased by various structures of the core portion. Therefore, the detergency is further increased as the polyketone resin is used. The bristles are not warped even when used for a long period of time, so that the bristles are less likely to be widened, and the appearance of the bristles is excellent, and the use period of the bristles can be further extended.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 through Figure 13 illustrate cross-sections of a bristle according to an aspect of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described more fully hereinafter with reference to the accompanying drawings, It should be understood, however, that the invention is not limited thereto and that various changes and modifications may be made without departing from the spirit and scope of the invention.

Unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention is merely intended to effectively describe a specific embodiment and is not intended to limit the invention.

Also, the singular forms as used in the specification and the appended claims are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The inventors of the present invention have made studies to improve the durability limit of conventional thermoplastic resins such as polyester resin and polyamide resin. As a result, they have found that by producing bristles using a polyketone resin, the cleaning power, durability, strength, abrasion resistance and chemical resistance Can be further improved. Further, it has been found that the cleaning power can be further improved by changing the color of the core portion and the sheath portion or by variously changing the shape of the core portion, and it is possible to provide more esthetic feeling and more pleasant toothbrushing. . Further, it is possible to produce a composite structure of a core-sheath structure or a multi-structure by using any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber except for the polyketone resin and polyketone, It is possible to further improve the flexibility while utilizing the merits of the physical properties as they are, thereby completing the present invention. Further, the polyketone resin is contained in the core portion, and one or two or more selected from thermoplastic resin, thermoplastic elastomer and rubber except for polyketone is included in the sheath portion, whereby the polyketone resin of the core portion And the durability is further improved and the surface area is increased according to various forms of the core part, and the cleaning power can be further improved, thereby completing the present invention. The present invention also relates to a core part comprising polyketone resins of various shapes and colors such as circular, elliptical, dumbbell, semicircular, fan, gull and polygonal, The bristles including the sheath portion and the toothbrush using the bristles can be completed.

One aspect of the present invention is a polyketone bristle brush comprising a core portion extending in one direction and a sheath portion surrounding the core portion, the polyketone bristles including a polyketone resin at least one selected from the core portion and the sheath portion, to be.

More specifically, one embodiment of the present invention may include a polyketone resin in the core portion, a polyketone resin in the sheath portion, or a polyketone resin in the core portion and sheath portion.

In one aspect of the present invention, the core portion and the sheath portion may be formed in various shapes and various colors such as circular, elliptical, dumbbell, semicircular, fan, gull, and polygonal, and may have the same or different shapes, And may be made of different colors.

First, the core portion of the present invention will be described.

(I) at least one bar shape penetrating the inside of the sheath

(Ii) a shape comprising a bar-shaped central portion passing through the interior of the sheath and a wing portion extending outwardly from the central portion, and

Iii) a shape including a bar-shaped central portion passing through the inside of the sheath and a wing extending outwardly from the central portion, and a frictional protrusion formed at an end of the wing portion and projecting to the outside of the sheath portion

Or a combination of two or more shapes selected from the above.

In an embodiment of the present invention, the core portion may be circular, oval, dumbbell, semicircular, fan, gull, polygonal, and the like, but is not limited thereto. The polygons may include, but are not limited to, triangular, square, pentagonal, hexagonal, star, cross and rhombus.

In the i) embodiment, the core is present in the form of an island in the interior of the sheath, and may be circular, oval, dumbbell, semicircular, fan, gull, polygonal or the like in cross section of the bristles But is not limited thereto. The polygons may include, but are not limited to, triangular, square, pentagonal, hexagonal, star, cross and rhombus. 1 and 2, the core portion 10 may penetrate the center of the sheath portion 20, or may be formed so as to extend through the center of the sheath portion 20, as shown in FIG. 3, Through the inside of the sheath portion 20 at the position of the sheath portion 20. 4 and 5, at least two core portions 10 radially disposed from the center of the sheath portion 20 may be formed. Although not shown in the drawings, Or more than two core portions passing through the core portion. The number of the core portions is not limited. Specifically, for example, the core portion may be composed of one or more, more specifically 1 to 20, and more specifically, 2 to 6, but is not limited thereto.

6 to 10, a certain region is formed like an island inside the sheath portion, and the center portion 11 formed like the island is formed on the surface side of the sheath portion side (outer side (Not shown). In the above mode (ii), the wing portion may be a plurality of wings extending to an edge of the sheath portion and disposed radially with respect to the center portion. The central portion formed like the island may be circular, oval, dumbbell, semicircular, fan, gull, polygonal, and the like, but is not limited thereto. The polygons may include, but are not limited to, triangular, square, pentagonal, hexagonal, star, cross and rhombus. Also, the wing portion may be formed as a straight line as shown in the drawing, or may be a bent or zigzag shape although not shown.

11 to 13, in the section of the bristles (iii), the bristles are divided into a plurality of bristles (not shown) extending from the central portion 11, And a friction protrusion 13 formed at an end portion of the wing portion and projecting to the outside of the sheath portion. In the mode (iii), the friction protrusion may be formed to surround a part of the edge of the sheath. The shape of the friction protrusions 13 is not limited, and by forming the friction protrusions, the area of contact with the teeth is increased, and the plaque can be more effectively removed. The central portion formed like the island may be circular, oval, dumbbell, semicircular, fan, gull, polygonal, and the like, but is not limited thereto. The polygons may include, but are not limited to, triangular, square, pentagonal, hexagonal, star, cross and rhombus. Also, the wing portion may be formed as a straight line as shown in the drawing, or may be a bent or zigzag shape although not shown. The shape of the friction protrusions is not limited, and may be formed in various shapes such as a triangle shape and a circular shape.

Further, although not shown separately, one or two or more core portions selected from the above-mentioned i) to iii) may be combinedly formed.

The cross section of the sheath may be circular, oval, dumbbell-shaped, semicircular, fan-shaped, gull-like, polygonal, or the like. It is not. The polygons may include, but are not limited to, triangular, square, pentagonal, hexagonal, star, cross and rhombus. In addition, when the core portion is made of a color different from that of the core portion, a variety of colors can be realized.

In one embodiment of the present invention, the diameter of the sheath may be 0.02 to 0.3 mm, and the diameter ratio D ₁ : D ₂ of the core and sheath may be 1: 1.2 to 5, more specifically 1: 1.2 to 2 And the bristles having excellent durability can be provided. However, the present invention is not limited thereto. In addition, the total length of the bristles may be 10 to 40 mm and is suitable for use as a bristle in the range, but is not limited thereto.

In one aspect of the present invention, the core portion and the sheath portion may be made of different materials. More specifically, for example, the core portion may include a polyketone resin, and the sheath portion may include any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber except for a polyketone resin. As described above, when the resin is manufactured as described above, the core portion is exposed while the resin of the sheath is worn, so that the durability of the core portion by the polyketone resin can be exhibited, and the effect of further improving the cleaning power by various forms of the core portion .

The resin used for the sheath portion is not particularly limited as long as it is selected from a thermoplastic resin except for polyketone, an elastomer, rubber, or the like. For example, polyolefin-based resins such as polyethylene and polypropylene; Polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate and polycyclohexanedimethylene terephthalate; Biodegradable resins such as polylactic acid, polycaprolactone, polyhydroxy alkanoate, polybutylene succinate, and the like; Thermoplastic olefinic elastomers such as ethylene-? Olefin elastomer, propylene-? Olefin elastomer, propylene-hexene elastomer, propylene-octene elastomer and ethylene-propylene-diene elastomer; Styrene-butadiene block copolymer, styrene-isoprene block copolymer, hydrogenated styrene-butadiene elastomer, styrene-butadiene-styrene elastomer, styrene-ethylene-butylene-styrene elastomer, styrene-ethylene-propylene-styrene elastomer A thermoplastic elastomer such as a styrene-based elastomer; And a thermoplastic elastomer such as a urethane-based thermoplastic elastomer; Polyamides such as nylon 6, nylon 66, and nylon 6/10; And halogenated polymers such as polyvinyl chloride, polytetrafluoroethylene, and the like, but are not limited thereto.

Further, the sheath portion may be made of a resin having a lower bending recovery rate than the core portion. The bending recovery rate is the physical property measured by the toothbrush specification KS G3103 measurement method. By using a resin having a higher bending recovery ratio in the sheath portion, it is possible to give more flexibility to the bristles. Specifically, for example, using polyester, more specifically polybutylene terephthalate, can provide more smooth bristles, but is not limited thereto.

The polyketone resin used for the core part may be a ternary copolymer of ethylene, propylene and carbon dioxide. For example, "POKETONE" series produced by Hyosung Co., Ltd. is a product such as M230A, M330A, M620A. Such a polyketone resin is not only excellent in durability and heat resistance, but also has high chemical resistance which shows excellent resistance to most chemicals, and abrasion resistance equivalent to that of polyacetal. Particularly, since it is hydrolyzable, it is very good because it does not cause decomposition due to long-term use. That is, when the polyketone fiber produced by spinning the polyketone resin is applied to a toothbrush as in the present invention, since the polyketone resin is excellent in hydrolysis resistance, it is possible to improve the long-term storage stability of the toothbrush which is easily exposed to moisture And the durability and abrasion resistance are further improved.

In one embodiment of the present invention, the core portion and the sheath portion may further comprise a functional material in addition to the resin. Specifically, it may include a functional material only in the core portion, a functional material only in the sheath portion, or a functional material in both the core portion and the sheath portion. In the case of including both the core portion and the sheath portion, they may include the same or different functional materials. The amount thereof is not limited, but it may be 0.1 to 30% by weight, more specifically 0.5 to 10% by weight, of the weight of the bristles. The functional material can be used without limitation as long as it is a material conventionally used in the field of bristles. Specifically, for example, the functional material may be selected from the group consisting of sodium carbonate powder, sodium hydrogen carbonate powder, natural extract, silver powder, gold powder, zeolite, carbon particles, ilite, bentonite, titanium oxide, antimicrobial agent, whitening particles, Powder, jade powder, volcanic clay powder, citrus charcoal powder, photocatalyst, pigment, dye and the like, or a mixture of two or more thereof. The mean particle size of the powder or particles contained in the functional material may be 0.001 to 10 탆, but is not limited thereto.

It is possible to provide a bristles which further has a pile effect, a cleaning effect and an antibacterial effect by further containing any one or two or more selected from the above-mentioned sodium carbonate powder and sodium hydrogen carbonate powder. Its content is preferably 1% by weight or less, more preferably 0.01 to 0.5% by weight, based on the weight of the bristles, but is not limited thereto.

More specifically, the natural extracts may contain at least one selected from the group consisting of propolis, green tea, ginseng, red ginseng, herb, aroma, marigold, phytoncide, magnolia, black tea, visa tea, pine needles, wormwood, lotus flower, aloe, And at least one selected from the group consisting of jasmine, camellia, camellia, ginkgo leaf, peppermint, corn, gingerbread, gossam, licorice, centrum, chamomile, lattania, rosemary, basil and silkworm It is not. The content thereof is preferably 1% by weight or less, more preferably 0.01 to 0.5% by weight, but is not limited thereto.

In the present invention, a pigment or a dye may be added to give a visual effect. The content of the pigment is preferably 1% by weight or less, more preferably 0.01 to 0.5% by weight, but not limited thereto.

In one aspect of the present invention, the bristles may be manufactured by melt-kneading and co-extruding a resin used for a core part and a sheath part by using a multiple extrusion method.

More specifically, it can be produced by extruding and extruding a core resin composition containing polyketone and a sheath resin composition containing other resin except for polyketone by multi-extrusion. That is, it may include a melt extrusion step, an extrusion spinning step, and a cooling and stretching step. These techniques are well known in the art and are briefly described below and are not limited to the following methods.

In the melt extrusion step, the extruder may be introduced into an extruder heated to 200 to 300 ° C. As the extruder, various extruders such as a twin-screw extruder are injected into a multi-mold die to produce a core- Can be manufactured.

In the extrusion spinning step, the melt extruded resin is extruded and spun using a nozzle to form a yarn. At this time, the melt-extruded resin is melt-extruded in an extruder, and the melt-extruded melt is metered in a spin pack having a die plate, and extruded and radiated through a nozzle of the die plate, And yarns of size can be produced. The cross-sectional shape of the yarn is determined by the shape of the die plate nozzle and may have various shapes such as a circle, an ellipse, a rectangle, a triangle, a regular polygon, a dumbbell, a cross, a disk, a gull, a rectangle, a diamond, That is, a core-sheath double-layered structure having a core portion and a sheath portion.

In the cooling and drawing step, the extruded yarn is cooled and then stretched to form a core-sheath structure conjugate fiber. At this time, the extruded raw yarn is discharged from the die plate, cooled in a water bath, and then transported to a stretching roll, stretched to 3 to 20 times its original length, and then wound. It is also heat treated as needed to remove stress.

The shape of the core and sheath of the bristles of the present invention or the structure having a structure extending from the inside of the composite fiber to the sheath surface or protruding from the core to the surface of the sheath layer may be formed by the structure of the mold, Which is not described here.

Hereinafter, the present invention will be described in more detail based on examples and comparative examples. However, the following examples and comparative examples are merely examples for explaining the present invention in more detail, and the present invention is not limited by the following examples and comparative examples.

1) Bending recovery rate (%)

The toothbrush was measured by the measuring method according to KS G3103.

A polyketone resin (POKETONE M230A, manufactured by Hyosung Co., Ltd.) was melt-extruded and stretched in the same manner as in Example to prepare a single filament having a thickness of 0.8 mm. The bending recovery rate was 45%.

Polyamide (Zytel) was melt-extruded and stretched in the same manner as in Example to prepare a single filament having a thickness of 0.8 mm, and the flexural recovery was measured and found to be 44%.

Table 1 below shows the flexural recovery rates for bristles of the core-sheath type in the examples and the comparative examples.

2) Strength (cm / N) and elongation (%)

The strength and elongation of the bristles were measured by the measuring method according to KS K0412 using a universal material testing machine.

3)

The durability of the bristles is a wearing test for measuring the wringing of the bristles. The toothbrush is repeatedly reciprocated twice at a rate of 2 times per second to the same irregular shape as that of the tooth.

[Formula 1]

(L1 = Brush diameter before brushing, L2 = Brush diameter after brushing)

4) User Rating

50 panelists were used for 30 days of the toothbrush manufactured by the present invention and the toothbrush manufactured in the present invention, and the results of the comparison test were used to evaluate the user's preference for the usability by the five-point comparison method.

The evaluation criteria are as follows.

5 points: Very good

4 points: Good

3 points: Normal

2 points: Bad

1 point: very bad

[Example 1]

Extruded at 245 DEG C using a polyketone resin (POKETONE M230A, manufactured by Hyosung Co., Ltd.) as a core part, melt extruded at 245 DEG C using polyamide (Zytel) as a sheath, Extruded through a die to extrude and spun filaments of core-sheath structure. Thereafter, the yarn was cooled to 10 DEG C and stretched at 180 DEG C to prepare a filament having a total thickness of 0.2 mm. The diameter of the core portion was 0.1 mm. This was cut to a length of 30 mm to prepare a bristle.

[Example 2]

The mixture was melt-extruded at a temperature of 245 占 폚 using 99.9% by weight of a polyketone resin (manufactured by Hyosung Corporation, POKETONE M230A) and 0.1% by weight of a red pigment and melt extruded from a polyketone resin (POKETONE M230A ) 99.9% by weight and a white pigment of 0.1% by weight were melt-extruded at 245 DEG C and co-extruded from a die having a mold structure as shown in Fig. 1 to extrude and spun the core-sheath filaments. Thereafter, the yarn was cooled to 10 DEG C and stretched at 180 DEG C to prepare a filament having a total thickness of 0.2 mm. The diameter of the core portion was 0.1 mm. This was cut to a length of 30 mm to prepare a bristle.

[Example 3]

99% by weight of a polyamide (Zytel) and 1% by weight of a zeolite powder were melt-extruded at a temperature of 245 캜 using 99% by weight of a polyketone resin (manufactured by Hyosung Corporation, POKETONE M230A) Extruded at 245 deg. C by weight as a sheath, co-extruded from a die having a mold structure as shown in Fig. 1 to extrude and spun the core-sheath filaments. Thereafter, the yarn was cooled to 10 DEG C and stretched at 180 DEG C to prepare a filament having a total thickness of 0.2 mm. The diameter of the core portion was 0.1 mm. This was cut to a length of 30 mm to prepare a bristle.

[Comparative Example 1]

Extruded from a die having a mold structure as shown in Fig. 1 by using polyamide (Zytel) alone, and extruded and spun filaments of core-sheath structure. Thereafter, the yarn was cooled to 10 DEG C and stretched at 180 DEG C to produce filaments having a diameter of 0.2 mm. The diameter of the core portion was 0.1 mm. This was cut to a length of 30 mm to prepare a bristle.

The physical properties of the bristles produced by the examples and comparative examples were evaluated and are shown in Table 1 below.

Flexion recovery rate
(%) burglar
(cm / N) Shindo
(%) Wake
(%) Rating 10000 times 20,000 times 30000 times Brushing Tooth cleaning effect Mock softness Example 1 45 15.1 40 5 8 12 4.5 4.8 4.8 Example 2 45 15.3 39 6 7 10 4.4 4.7 4.7 Example 3 45 15.2 35 8 10 13 4.5 4.8 4.8 Comparative Example 1 44 10.2 43 72 82 95 3.3 3 2.2

10: core part
11: center
12: wing portion
13: Friction projection
20: Shebu

Claims (13)

A polyketone bristle comprising a core portion extending in one direction and a sheath portion surrounding the core portion, wherein the polyketone resin comprises at least one selected from the core portion and the sheath portion. The method according to claim 1,
The core portion
(I) at least one bar shape penetrating the inside of the sheath
(Ii) a shape comprising a bar-shaped central portion passing through the interior of the sheath and a wing portion extending outwardly from the central portion, and
Iii) a shape including a bar-shaped central portion passing through the inside of the sheath and a wing extending outward from the central portion, and a frictional protrusion formed at an end of the wing portion and protruding to the outside of the sheath portion
≪ RTI ID = 0.0 > and / or < / RTI > the polyketone bristles. 3. The method of claim 2,
The polyketone bristle according to the above mode ii), wherein the wing portion extends to an edge of the sheath portion and is arranged radially with respect to the center portion. 3. The method of claim 2,
In the above-mentioned mode (iii), the friction protrusion is formed so as to surround a part of an edge of the sheath portion. 3. The method of claim 2,
Wherein the core portion and the sheath portion are each selected from a circle, an ellipse, a dumbbell, a semicircle, a fan, a gull, and a polygonal cross-section. 6. The method of claim 5,
Wherein the polygon is selected from a triangle, a rectangle, a pentagon, a hexagon, a star, a cross and a rhombus. The method according to claim 1,
Wherein the core portion and the sheath portion are made of different materials. 8. The method of claim 7,
Wherein the core portion comprises a polyketone resin,
Wherein the sheath portion comprises any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber. The method according to claim 1,
Wherein at least one selected from the core portion and the sheath portion further comprises a functional material. 10. The method of claim 9,
The functional material may be selected from the group consisting of sodium carbonate powder, sodium bicarbonate powder, natural extract, silver powder, gold powder, zeolite, carbon particles, ilite, bentonite, titanium oxide, antimicrobial agent, whitening particles, vitamin, charcoal powder, bamboo salt powder, Volcanic clay powder, citrus charcoal powder, photocatalyst, pigment, and dye, or a mixture of two or more thereof. The method according to claim 1,
Wherein the sheath has a diameter of 0.02 to 0.3 mm,
Wherein the core portion and the sheath have a diameter ratio of 1: 1.2 to 1: 5. The method according to claim 1,
Wherein the total length of the bristles is 10 to 40 mm. 13. A toothbrush comprising a polyketone bristle according to any one of claims 1 to 12.

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