KR101501438B1 - Manufacturing method of toothbrush bristle and using the same - Google Patents

Abstract

 The present invention relates to a toothbrush comprising a core-sheath double structure and various cross-sectional shapes, comprising inorganic particles and tapered to form irregularities on the surface, and brush bristles including inorganic or organic antimicrobial materials And a manufacturing method thereof.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a toothbrush manufacturing method,

The present invention relates to a method of manufacturing a bristle and a toothbrush using the same.

A toothbrush is a typical tool used to clean the oral cavity including the gums. Generally, the toothbrush is composed of a bag and bristles, and the bristles are usually manufactured using a synthetic resin having elasticity. Such general bristles are made of nylon or polyester. Nylon has the advantage of having moderate elasticity and flexibility, but it has a short life span due to its high absorbability and a low strength so that it must have a certain thickness or more and can not be processed such as tapering. It has a disadvantage that it is difficult to completely remove calculus, food waste and the like because of low penetration ability. In the case of polyester bristles, when the tapered bristles are not tapered, the elasticity of the brush bristles is large and the flexibility is low. Therefore, when the user's gums are easily damaged and tapered, they have excellent permeability and flexibility,

Another disadvantage of the conventional bristles is that the bristles proliferate in the bristles. Most of the toothbrush is kept exposed to the atmosphere after the user brushes teeth, and the brush bristles are left dry due to the characteristics of the toothbrush, thereby creating an environment suitable for living microorganisms. These microorganisms can be transferred to the oral cavity during tooth brushing and cause periodontal disease.

To solve the above problems, various types of toothbrushes having antimicrobial and antioxidant properties have appeared. Most of these functional toothbrushes contain ingredients such as pine needles, charcoal, barley sprouts, bamboo salt, and shine, and inorganic antibacterial agents such as silver nano, silver ion, platinum, gold, copper, and manganese are included in the bristles. These materials are generally included in the polymer resin forming the bristle material. Inorganic antibacterial agents are not influenced by the use of spinning solution. However, in case of vegetable antibacterial agents, antimicrobial activity and beneficial ingredients There is a problem that is destroyed.

Korean Patent Registration No. 10-0944799 relates to a method for manufacturing bristles by mixing a barley sprout component and an inorganic antibacterial agent powder in a molding process of a bristle so as to include a certain component in a polymer resin. According to the above-described invention, the function of the barley bud gives a cooling sensation to the gums and promotes blood circulation. However, among the components contained in barley sprouts, vitamin C is weak against heat, so it is easily destroyed by the temperature of the spinning solution and it is questionable whether the desired function can be obtained in the above invention.

Korean Patent No. 10-0953868 discloses an invention relating to bristles having various effects such as pine needle powder and bamboo salt component mixed with a synthetic resin to have antibacterial properties, humidity control, deodorization, and purification of pine needles. However, in the above-described invention, there is a possibility that the component of pine leaf is partially destroyed or denatured by the heat of the spinning solution, and the functions such as permeability required for effectively removing tartar and food residue are not presented.

Korean Patent No. 10-0944799 (February 22, 2010) Korean Patent No. 10-0953868 (April 20, 2010)

In order to solve the above problems, the present invention aims to provide a method for manufacturing a new bristle and a toothbrush using the same, which has a semi-permanent antibacterial power, which is a disadvantage of existing toothbrushes and bristles, and which realizes excellent washing power and penetration power.

In order to accomplish the above object, the present invention provides a core-sheath double structure and various cross-sectional shapes, comprising inorganic particles and tapered to form irregularities on the surface, To a method of manufacturing a bristles including an antibacterial substance and a toothbrush using the same.

According to an aspect of the present invention,

a) preparing a core-cis-shaped filament consisting of a core portion and a cis portion;

b) cutting the filament;

c) dipping one end of the filament of step b) in a processing bath containing the tapered solution;

d) dipping the other end of the filament in step c) in a processing tank containing an alkali solution;

To a bristle manufacturing method.

Another aspect of the present invention relates to a toothbrush using a bristle manufactured by the above method.

Hereinafter, a method of manufacturing a bristle according to the present invention and a toothbrush using the same will be described in detail.

The structure of the bristles according to the present invention may be a core-sheath made of a core portion and a sheath portion. The core portion and the sheath portion may be made of a polymer resin capable of tapering, and the core portion and the polymer resin forming the sheath portion may be the same or different.

Preferred examples of the polymer resin include polypropylene, polytrimethyleneterephthalate, polyethyleneterephthalate, polybutyleneterephthalate, polytrimethyleneterephthalate, nylon 6 ( nylon 6), nylon 11, nylon 12, nylon 6,6, nylon 6,10 and nylon 6,12. .

The core portion of the bristles preferably comprises 10 to 90% by volume of the total filament and 10 to 90% by volume of the sheath portion.

When the bristles are cut perpendicularly to the axial direction, they may have a cross-section other than a circular shape. The shape of the cross-section may be circular, dumbbell-shaped, cross-shaped, disc-shaped, gull-like, triangular, rectangular, rhombic or conical. The cross section may be determined in the form of a spinneret when spinning the polymeric resin comprising the bristles.

The polymeric resin constituting the bristles, that is, any one of the core portion and the sheath portion, or both the core portion and the sheath portion, may further include an additive. Wherein the additive comprises organic particles, inorganic particles or a mixture of organic particles and inorganic particles, wherein the addition of the additive improves the strength of the bristles or regulates their elasticity and acts as an insoluble portion when tapering the bristles And serves to form irregularities on the surface.

The organic particles are not limited to any kind as long as they are commonly used in the art, and may be in powder form. Examples of the organic particles include various plant extracts such as green tea, barley sprout extract, ginkgo leaf extract, pine leaf extract, and bamboo extract; Powders of activated carbon, xylitol and the like; Polyacrylic polymers such as polyacrylic acid, poly (meth) acrylate and polyvinyl acetate; Cellulosic polymers such as cellulose, hydroxypropylmethylcellulose, hydroxymethylcellulose, methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose and carboxymethylcellulose; Polyalcohol-based polymers such as polyvinyl alcohol, polyethylene glycol, polypropylene glycol, and polypropylene glycol copolymer; Polyethylene oxide, and the like. These substances can release functional ingredients useful for oral health, promoting blood circulation, activating cell function, and giving a cooling sensation to the gums.

The inorganic particles are not limited to the kind within the scope of achieving the object of the present invention, but are preferably zeolite, silica alumina, calcium phosphate, zirconium phosphate, calcium carbonate, silica gel, titanium dioxide, zinc oxide, zirconium carbide, It is preferable to use one or two or more selected from among magnesium oxide, silicon dioxide and aluminum oxide.

The additive preferably has an average particle diameter of 0.1 to 10 mu m, and preferably has an average particle diameter of 2 to 5 mu m. When the average particle diameter of the additive is less than 0.1 탆, it is difficult to obtain the desired cleaning force in the present invention. When the average particle diameter exceeds 10 탆, the tensile strength of the produced bristles is lowered.

The additive is preferably added in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the polymer resin constituting the core part or sheath part. When the amount is less than 0.1 part by weight, the desired unevenness is small and sufficient washing power can not be obtained. When the amount is more than 20 parts by weight, the strength of the filament is decreased. When it is included in both the core part and the sheath part, it is preferable to add them satisfying the above respective ranges.

The bristles of the present invention may contain one or more antimicrobial materials to effectively block the growth of microorganisms and fungi even under humid conditions. The antimicrobial material may be an organic material or an inorganic material.

The inorganic substance usable as the antibacterial substance may be selected from the group consisting of zeolite, silica alumina, calcium phosphate, zirconium phosphate, calcium carbonate, silica gel, titanium dioxide, zinc oxide, zirconium carbide, magnesium oxide, It is preferable to use an inorganic material carrying any one or more metal ions selected from gold, platinum, silver and copper, or to use the metal ion or the nano metal alone.

The inorganic material preferably has an average particle diameter of 0.1 to 10 mu m, preferably 2 to 5 mu m. In addition, the inorganic material acts as an insoluble material when tapered, thereby increasing irregularities on the surface.

The organic material that can be used as the antimicrobial material is not limited to any kind as long as it is a substance that does not adversely affect the human body. The organic material may be added when polymerizing the spray polymer resin.

The organic material may be a chloride or a guanidine compound such as benzalconium chloride, benzethonium chloride, or cetyl pyridinium chloride. Preferred are cetyl pyridinium chloride, 1,1-hexamethylene bis (5- (4-chlorophenyl) biguanide, 1,1-hexamethylene bis hydrochloride, polyhexamethylene biguanide hydrochloride, 1-methyl-2-nitro-3 - [(3-tetrahydrofuryl) methyl] guanidine (1-methyl- polytetramethyleneguanidinium, polyhexamethyleneguanidinium, polyhexamethylene guanidine phosphate, etc. The organic antimicrobial material may be selected from the group consisting of polytetramethyleneguanidinium, polytetramethyleneguanidinium, polyhexamethylene guanidine phosphate, A method of forming positive ions on the surface of the bristles in the presence of water and electrically pulling the anions formed on the surface of the microbial cells of the positive ions to destroy the cell walls by attraction It will act as.

The antibacterial substance is preferably added in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the polymer resin constituting the core portion or the sheath portion, preferably 0.1 to 3 parts by weight of an inorganic antibacterial substance and 0.1 to 2 parts by weight of an organic antibacterial substance , And it is more preferable to use a guanidine-based compound as an organic antimicrobial substance.

Further, the present invention can form tapered surfaces on the surface, and taper the surface of the bristles with an alkali solution or the like in order to make the distal end of the bristles thinner. The tapering may be performed by using a different type of tapered solution depending on the type of resin constituting the bristles. Preferably, when the polymer resin is a polyamide such as nylon, an acidic solution such as hydrochloric acid, nitric acid, When the polymer resin is a polyester, it is preferable to use an alkali solution such as sodium hydroxide, ammonium hydroxide, calcium hydroxide and potassium hydroxide. The taper solution may use one or more solutions, and may be tapered one or more times depending on the kind of the polymer resin forming the core part and the sheath part.

Hereinafter, a method of manufacturing a bristle according to the present invention will be described.

A preferred method of making a bristle according to the present invention comprises

a) preparing a core-cis-shaped filament consisting of a core portion and a sheath portion having inorganic particles;

b) cutting the filament;

c) dipping one end of the filament of step b) in a processing bath containing the tapered solution;

d) dipping the other end of the filament in step c) in a processing tank containing an alkali solution;

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The step a) is a step of producing a core-sheath type filament composed of a core part and a sheath part. The filament may be produced by a melt-extrusion process using a general spinning process such as melt spinning, dry spinning, wet spinning, or wet spinning. In this case, the spinneret provided in the radiator is preferably shaped like a circle, a dumbbell, a cross, a disk, a gull, a triangle, a square, a diamond and a cone in order to vary the shape of the cross section of the filament. It is good to do. Further, at the time of preparing a spinning solution, a dye may be further added in addition to the antibacterial substance or inorganic particles to spin the core portion and the sheath portion in different colors. The dye is not limited to the kind within the scope of achieving the object of the present invention, and it is preferable to use an organic or inorganic pigment. The pigment is preferably added in an amount of 0.01 to 2 parts by weight based on 100 parts by weight of the total sea component or the isotropic liquid dispersion.

 The melting and extruding process in the step a) is performed through a nozzle having a plurality of (32 to 300) spinnerets (0.5 to 2 mm in diameter) of the above-described type in a radiator heated to 220 to 300 ° C. In order to increase the flexibility and strength of the filament after extrusion, it may include a stretching process. The stretching process is determined by the winding speed and is preferably 3 to 6 times at a temperature of 150 to 220 ° C. The stretching process is preferably performed once to four times.

The composite filament produced in the step a) may have a diameter of 0.02 to 0.3 mm in diameter. When the thickness is less than 0.02 mm, the strength is lowered. When the thickness is more than 0.3 mm, undrawn phenomenon occurs, and when the tooth is crouching, the penetration force between teeth is lowered.

Next, the step b) is a step of cutting the composite filament prepared in the step a). The bundle of bundles may be bundled with bundles of 40 to 60 mm in order to facilitate the subsequent process.

The composite filament is cut to be equal to the length of the finished product at the time of tapering or cut to a length of about 1 to 20 mm longer than the length of the finished product. The composite filament is manufactured by toothbrushing after being tapered, so it is preferable to adjust the length of the bundle in consideration of this.

Next, the step c) is a step of immersing one end of the filament cut in the step b) in a working tank containing an alkali solution. When the polymer resin constituting the filament is polyamide such as nylon, it is preferable to use an acidic solution such as hydrochloric acid, nitric acid, sulfuric acid or the like in an amount of 10 to 30% by weight or a phenol or the like in an amount of 5 to 10% In the case of esters, it is preferable to use an alkali solution such as sodium hydroxide, ammonium hydroxide, calcium hydroxide and potassium hydroxide in an amount of 20 to 40% by weight. The tapering may be carried out at a temperature of 80 to 140 캜. At this time, the length of tapering can be adjusted according to the immersion length.

Further, in the present invention, the cross-sectional area of the other end tapered can be adjusted by controlling the number of times of immersion. It is preferable to repeat the immersion for 2 to 20 times at a time of 10 to 60 seconds per desirably. The cross-sectional area of the filament tapered by repeated dipping becomes gradually thinner toward the other end, and a thin filament having a desired end portion can be produced in the present invention.

The tapering process reduces the cross-sectional area of the other end of the filament and forms irregularities on the surface of the filament, thereby achieving an increase in the desired cleaning force in the present invention. This can be obtained by variously controlling the time of the tapering, the concentration of the solution, and the immersion length of the filament.

In the step d), one end of the filament of the step c) is dipped in a processing tank containing the tapered solution. The step d) may be the same as the step c).

When the tapering process is completed, the hydrolyzed portion is washed and removed to form a tapered portion. The washing may further include washing the running water two or three times, and neutralizing the alkali using diluted sulfuric acid in the middle of the washing process.

After the step is completed, the method may further include the step of filling the filament manufactured in step d) into the toothbrush bag. The toothbrush bag is not limited to the type and function within the scope of achieving the object of the present invention. The toothbrush bag may be made of at least one material selected from a synthetic resin material, a metal material, a ceramic material, and a plastic material. Of course, the toothbrush bag may be made of a single material, or may be formed by combining two or more materials such as a metal material and a shell made of an elastic material thereon, or the like.

The flaps of the filament may be formed in the center of the filament, and the flaps of the filament may be freely deformed according to the shape of the toothbrush bag and the flocking process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in order to avoid unnecessary obscuration of the present invention. The above description is only one example for explaining the present invention in detail The present invention is not limited thereto.

1 shows a cross section 10, 20, 30, 40, 50, 60, 70, 80 of a single strand of a bristle made from various types of detents in accordance with one preferred embodiment of the present invention. The circles 11, 21, 31, 41, 51, 61, 71, and 81 located at the center of each cross section represent the core portion, and the portions 12, 22, 32, 42, 52, 62, 72, 82 ) Represents a sheath portion.

FIG. 2 is a perspective view of a bristle made of a toothbrush of a halved shape 30 in the drawing shown in FIG. The bristles 100 on the right side are bristles made of the core portion 101 and the sheath portion 102 manufactured according to the manufacturing method of the present invention. .

Fig. 3 shows the bristles of Fig. 2 tapered. 2 shows that the bristles 90 of FIG. 2 are tapered, and the right side shows the bristles 100 of FIG. 2 being tapered. As shown in FIG. 3, the bristles manufactured according to the manufacturing method of the present invention have irregularities on the surface.

The toothbrush manufactured by the manufacturing method according to the present invention has a core-sheath double structure and various cross-sectional shapes. The toothbrush contains inorganic particles and is tapered to form irregularities on the surface, It achieves better cleaning power and penetration power. In addition, by including an inorganic or organic antibacterial substance, it is possible to have a semi-permanent antibacterial power which is hard to find in a conventional toothbrush.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a section of a bristle made according to a preferred embodiment of the invention.
Fig. 2 is a perspective view of a bristle made of a 12-sided cross section 30 of the cross section of Fig. 1 above.
Fig. 3 is a perspective view of the bristles obtained by tapering the bristles of Fig. 2. Fig.

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

The physical properties of the toothbrushes prepared according to the following examples were measured as follows.

(Antimicrobial activity measurement)

50 g of the filaments constituting the bristles used in the following examples and comparative examples were collected and the bactericidal reduction rate and the antibacterial reduction rate thereof were measured by the antibacterial measurement method of KS J 4206 of the Korean Industrial Standard. Specifically, Staphylococcus aureus and Klebsiella pneumoniae were used as test bacteria, and the initial number of bacteria (Staphylococcus aureus: 1.4 × 10 ⁵ / ml, pneumonia bacterium: 1.8 × 10 ⁵ / ml) And 18 hours after culturing, and the values were substituted into the following equations (2) and (3).

(Where M _a : the number of viable bacteria immediately after inoculation of a test piece to which no antimicrobial substance is added

M _b : Number of viable cells after 18 hours of incubation of test pieces without added antimicrobial substance

M _c : the number of viable cells after 18 hours of incubation of the test piece containing the antimicrobial substance)

(Consumer preference for usability)

After using the toothbrush manufactured by the manufacturing method of the present invention and a conventional toothbrush for a predetermined period (7 days) for 50 panel members, the items such as brushing sensation, cleansing power, durability and flexibility were investigated through questionnaires, Respectively.

[Example 1]

2 kg of polybutyleneterephthalate (PBT) having a weight average molecular weight of 75,000 as a core forming material and 2 kg of nylon 6,12 having a weight average molecular weight of 40,000 as a sheath forming material were prepared. (Guacil TX, SK Chemical) as an antimicrobial substance were prepared and mixed in a core-forming material and a sheath-forming material at a weight ratio of 5: 5, respectively, and mixed. The core forming material was charged into a first extruder at a temperature of 260 ° C and the sheath forming material was charged into a second extruder at 250 ° C to combine the filament into a composite die and discharge the filament through the spinneret. The spinneret was circular in shape and simultaneously spun to produce core-sheath filaments. The radiated filaments were cooled and drawn, and then bundled into a bundle with a diameter of 50 mm. The prepared bundle was cut into a length of 30 mm and then tapered by immersing it in an alkaline solution of a concentration of 30% at 120 캜. Immersion was repeated twice.

The other end of the bundle after the dipping process was tapered by repeating the same process as the above taper process. The tapered filament was washed twice with flowing water, neutralized with dilute sulfuric acid, and then rinsed again to prepare a tapered filament bundle having finely finized ends. The antibacterial properties of the prepared bundles were measured, and the antibacterial properties of the prepared bundles were shown in Table 1. The prepared toothbrushes were prepared and the usability was measured.

[Example 2]

The filament bundles were prepared using the same process and conditions as in Example 1, except that the spinneret had a twelve (30) shape. The antibacterial properties of the prepared bundles were measured, and the antibacterial properties of the prepared bundles were shown in Table 1. The prepared toothbrushes were prepared and the usability was measured.

[Example 3]

Filament bundles were prepared using the same processes and conditions as in Example 2 except that 2 kg of polyethylene terephthalate (PET) having a weight average molecular weight of 40,000 was used as the core forming material. The antibacterial properties of the prepared bundles were measured, and the antibacterial properties of the prepared bundles were shown in Table 1. The prepared toothbrushes were prepared and the usability was measured.

[Example 4]

Filament bundles were prepared using the same processes and conditions as in Example 2 except that 2 kg of nylon 6,10 having a weight average molecular weight of 32,000 was used as a sheath forming material. The antibacterial properties of the prepared bundles were measured, and the antibacterial properties of the prepared bundles were shown in Table 1. The prepared toothbrushes were prepared and the usability was measured.

[Example 5]

80 g of polyhexamethylene guanidine phosphate (Guacil TX, SK Chemical) as an antibacterial substance and 8 g of an inorganic antibacterial agent (CWT-A, Jisim Tech Co., Ltd.) having an average particle size of 3 탆 were prepared, A filament bundle was prepared using the same process and conditions as in Example 2, except that it was incorporated into the sheath forming material and mixed. The antibacterial properties of the prepared bundles were measured, and the antibacterial properties of the prepared bundles were shown in Table 1. The prepared toothbrushes were prepared and the usability was measured.

[Comparative Example 1]

2 Kg of PBT was used as the filament forming material, and single emulsion was formed without forming the envelope. The unevenness forming material was not added, and 80 g of polyhexamethylene guanidine phosphate as an antibacterial substance was added to prepare a spinning solution. The temperature of the radiator was 260 ° C and the spinneret was circular. The radiated filaments were cooled and drawn, and then bundled into a bundle with a diameter of 50 mm. The prepared bundle was cut into a length of 30 mm and then tapered by immersing it in an alkaline solution of a concentration of 30% at 120 캜. Immersion was repeated twice.

The other end of the bundle after the dipping process was tapered by repeating the same process as the above taper process. The tapered filament was washed twice with flowing water, neutralized with dilute sulfuric acid, and then rinsed again to prepare a tapered filament bundle having finely finized ends. The antibacterial properties of the prepared bundles were measured, and the antibacterial properties of the prepared bundles were shown in Table 1. The prepared toothbrushes were prepared and the usability was measured.

[Comparative Example 2]

A filament bundle was prepared using the same process and conditions as in Comparative Example 1 except that no antimicrobial material was added. The antibacterial properties of the prepared bundles were measured, and the antibacterial properties of the prepared bundles were shown in Table 1. The prepared toothbrushes were prepared and the usability was measured.

[Table 1]

[Table 2]

*Evaluation standard

5: Very good

4: Good

3: Usually

2: Bad

1: very bad

As shown in Table 1, the antibacterial properties of Examples 1 to 5 are remarkably superior to those of Comparative Example 2. It can also be seen that the antibacterial properties of Examples 2 to 5 having different spinnerets are slightly better than those of Example 1 and Comparative Example 1 using a circular spinneret. This seems to be due to the increased surface area of the radiated filaments and more of the antimicrobial material with cations.

Also, as shown in Table 2, it can be seen that Examples 1 to 5 exhibit significantly superior values for brushing and cleaning power than Comparative Examples 1 and 2. Particularly, in Example 5, inorganic particles and inorganic antimicrobial materials are formed into irregularities, and at the same time, the surface area of the filament is increased, which shows that the antibacterial agent exhibits better washing power and antibacterial activity.

As described above, the present invention has a core-sheath structure and can increase the surface area of the filament by variously adjusting the shape of the spinneret when spinning the filament, forming the irregularities of the surface through tapering, By controlling the cross-sectional area, bristles having excellent antibacterial and cleaning properties can be produced.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, the above description does not limit the scope of the present invention defined by the limitations of the following claims.

10, 20, 30, 40, 50, 60, 70, 80: cross section of the bristles
11, 21, 31, 41, 51, 61, 71, 81:
12, 22, 32, 42, 52, 62, 72, 82:
90, 100, 110, 120: filaments
101 and 121:
102, 122: sheath
111 and 123: concave and convex portions

Claims (10)

a) preparing a core-cis-shaped filament consisting of a core portion and a cis portion;
b) cutting the filament;
c) dipping one end of the filament in the step b) in a processing tank containing the tapered solution and tapering to form irregularities on the surface of the filament;
d) dipping the other end of the filament in the step c) in a processing tank containing an alkali solution and tapering to form irregularities on the surface of the filament;
Wherein 0.1 to 10 parts by weight of a guanidine compound is further added to 100 parts by weight of the core part, the sheath part or the core part and the sheath part of the toothbrush. The method according to claim 1,
Wherein the cross section of the bristles is any one of a dumbbell, a cross, a disc, a gull, a triangle, a quadrangle, a rhombus, and a cone. The method according to claim 1,
Wherein the core or sheath is selected from the group consisting of polypropylene, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, nylon 6, nylon 11, nylon 12, nylon 4,6, nylon 6,6, nylon 6,10, 6, and 12, wherein the bristles are made of polymer resin. The method according to claim 1,
Wherein the core portion, the sheath portion, or the core portion and the sheath portion further comprise an additive including organic particles, inorganic particles, or a mixture thereof. 5. The method of claim 4,
Wherein the organic particles are selected from the group consisting of green tea, barley sprout extract, ginkgo leaf extract, pine leaf extract, bamboo extract, activated carbon, xylitol, and water-soluble polymers, and the inorganic particles include zeolite, silica alumina, calcium phosphate, zirconium phosphate, Wherein the one or more selected from calcium carbonate, silica gel, titanium dioxide, zinc oxide, zirconium carbide, magnesium oxide, silicon dioxide and aluminum oxide. 6. The method of claim 5,
Wherein the inorganic particles further bear one or two or more metal ions selected from gold, silver, platinum and copper. 5. The method of claim 4,
Wherein the additive has an average particle diameter of 0.1 to 10 mu m. delete delete A toothbrush using a bristle manufactured by the method of any one of claims 1 to 7.

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