WO2016064208A1 - Method for manufacturing toothbrush bristles comprising biodegradable resin and toothbrush using toothbrush bristles - Google Patents

Abstract

The present invention relates to toothbrush bristles comprising biodegradable materials, and a manufacturing method therefor. More specifically, provided are: core-shell structured toothbrush bristles comprising a polyester-based resin and a biodegradable resin; and a manufacturing method therefor.

Description

Method for producing bristles containing biodegradable resin and toothbrush using same

The present invention relates to a method for producing bristles including a biodegradable material and a toothbrush using the same. More specifically, the present invention provides a method for producing a bristle of a core-shell structure including a polyester-based resin and a biodegradable resin, and a toothbrush using the same.

Biodegradable resins that can replace existing chemical synthetic resins in domestic and overseas industries are being developed as social problems are caused by secondary environmental pollution problems caused by the decomposition and disposal of waste plastics and overloading of landfills worldwide. Development is being actively made to apply this biodegradable resin is currently in the spotlight as an environmentally friendly resin.

Such biodegradable resins have low impact strength, no UV stability, high moisture absorption, difficult to maintain quality for a long time, and are difficult to replace physical properties of conventional chemical synthetic resins as materials having poor physical and thermal properties that are fragile.

In addition, when using a high proportion of natural polymer resin among biodegradable resins, it is very difficult to commercialize the unique color of the resin into a soft and bright color such as a toothbrush. Compared to the high side there are many restrictions on use.

In addition, the use of biodegradable resin in the toothbrush for daily use has been developed a lot in the toothbrush pole, but the bristle is still using mainly nylon or PBT material.

In general, biodegradable raw materials are difficult to compound with polymers in the process of manufacturing bristles, that is, extrusion, and various additives are used to overcome them. In addition, in the case of using the polymer alone, products have been developed by blending various crosslinking agents, binders and the like in order to maintain the strength and elasticity of the polymer and to provide both softness and washing power of the bristles.

The present invention produced an environmentally friendly and naturally degradable bristles using biodegradable natural polymer resin or natural powder that can replace chemical synthetic resin, poor physical properties of biodegradable natural powder or natural polymer contained in a high weight In order to overcome the difficulty of replacing the physical properties of the chemical synthetic resin due to the addition of various additives to prepare a fine hair for a toothbrush having excellent elasticity and resilience and to provide a toothbrush using the same.

The present invention is a bristle brush of the core-shell structure made of a resin composition comprising a blend resin and a binder comprising a polyester-based resin and a biodegradable resin,

It provides a bristles characterized by satisfying the following formula 1.

0.2A≤B≤0.7A

(In Formula 1, A is the content (parts by weight) of the biodegradable resin of the core layer,

Based on the content of 100 parts by weight of the biodegradable resin of the core layer, B is the content (part by weight) of the biodegradable resin of the shell layer.)

The polyester resin of the present invention provides a bristles, characterized in that the polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate or two or more polyester-based resin.

The biodegradable resin of the present invention is polyhydroxybutylate-valerate (PHBV), polyanhydrides, polyphosphazenes, polyorthoesters, polycaprolactones which are aliphatic polyesters. (PCL), polylactic acid (PLA), polybutylene succinate (PBS), polybutylene adipate (PBA), polybutylene adipate-terephthalate (PBAT), polybutylene succinate- adipate (PBSA ), Polybutylenesuccinate-terephthalate (PBST), corn stalks, sugar cane, hemp, hay, starch, polyhydroxyalkanoate (PHA), collagen, albumin, gelatin and dextran It provides a bristles, characterized in that.

The binder of the present invention provides bristles, characterized in that at least one selected from the group consisting of polyethylene, polypropylene, polyurethane, polyester, polyamide, silicone, natural rubber, thermoplastic elastomer.

The thermoplastic elastomer provides bristles, characterized in that styrene butadiene styrene (SBS), thermoplastic polyurethane (TPU) or a mixture thereof.

It provides a bristles comprising 1 to 10 parts by weight of the binder with respect to 100 parts by weight of the blend resin mixed with the polyester resin and the biodegradable resin of the present invention.

The present invention comprises the steps of: a) co-spinning a resin composition comprising a polyester-based resin, a biodegradable resin and a binder to produce a core-shell filament;

b) stretching the filament after cooling;

c) after the tapering treatment of the filament, planted into a toothbrush;

It provides a method for producing a fine hair for a toothbrush comprising.

The present invention provides a bristle of the core-shell structure bristles satisfying the following formula (1).

0.2A≤B≤0.7A

(In Formula 1, A is the content (parts by weight) of the biodegradable resin of the core layer,

Based on the content of 100 parts by weight of the biodegradable resin of the core layer, B is the content (part by weight) of the biodegradable resin of the shell layer.)

The present invention provides a method for producing bristles, characterized in that the polyester resin is polybutylene terephthalate, polytrimethylene terephthalate or a mixture thereof.

The biodegradable resin of the present invention is polyhydroxybutylate-valerate (PHBV), polyanhydrides, polyphosphazenes, polyorthoesters, polycaprolactones which are aliphatic polyesters. (PCL), polylactic acid (PLA), polybutylene succinate (PBS), polybutylene adipate (PBA), polybutylene adipate-terephthalate (PBAT), polybutylene succinate- adipate (PBSA ), Polybutylenesuccinate-terephthalate (PBST), corn stalks, sugar cane, hemp, hay, starch, polyhydroxyalkanoate (PHA), collagen, albumin, gelatin and dextran It provides a method of manufacturing bristles, characterized in that.

The binder of the present invention provides a method for producing bristles, characterized in that at least one selected from the group consisting of polyethylene, polypropylene, polyurethane, polyester, polyamide, silicone, natural rubber, thermoplastic elastomer.

The thermoplastic elastomer is not particularly limited, but may be, for example, styrene butadiene styrene (SBS), thermoplastic polyurethane (TPU), or a mixture thereof, but is not limited thereto.

The present invention provides a method for producing bristles, comprising 1 to 10 parts by weight of the binder, based on 100 parts by weight of the blended resin in which the polyester resin and the biodegradable resin are mixed.

It provides a toothbrush prepared according to the above production method of the present invention.

The present invention provides a bristle containing a biodegradable resin and a method for producing the same, further comprising a thermoplastic elastomer resin as a binder in a resin composition mixed with a polyester-based resin and a biodegradable natural polymer resin, the elasticity and resilience of the bristles When the micro hair is processed by modifying it to have a more flexible elastic recovery rate, it is possible to provide a fine hair for toothbrush excellent in brushing.

In addition, in the production of environmentally friendly bristles with a resin composition containing a high weight of biodegradable natural polymer resin, by preparing a bristle with a core-shell structure, by using a small amount of natural polymer in the shell layer of the bristles compared to the core layer, Due to the inherent color has the advantage of preventing rejection due to the color of the brush head.

The present invention is to develop an environmentally friendly bristles by mixing a polyester-based resin and biodegradable resins in more detail, the development of environmentally friendly filaments and toothbrushes for the bristles market made of chemical synthetic resins such as nylon and PET To complete the development of eco-friendly toothbrush fine bristles in the bristle market made of chemical synthetic resins such as nylon and PET, by manufacturing a core-shell structure filament so that the bristle filament can contain a high weight of biodegradable resin in the polyester resin It became.

Hereinafter, the present invention will be described in more detail.

The present invention has completed the present invention after numerous studies for developing bristles using biodegradable resin that is environmentally friendly and naturally degradable.

The present invention comprises the steps of: a) co-spinning a resin composition comprising a blend resin and a binder comprising a polyester-based resin and a biodegradable resin to produce a core-shell filament;

b) stretching the filament after cooling;

c) after the tapering treatment of the filament, planted into a toothbrush;

It can provide a method for producing a bristle of the core-shell structure comprising a.

In still another aspect of the present invention, the bristle of the core-shell structure may provide a method of manufacturing bristles, wherein the bristles satisfy the following formula.

0.2A≤B≤0.7A

(In Formula 1, A is the content (parts by weight) of the biodegradable resin of the core layer,

Based on the content of 100 parts by weight of the biodegradable resin of the core layer, B is the content (part by weight) of the biodegradable resin of the shell layer.)

The present invention can produce a resin composition comprising a blend resin and a binder containing the polyester-based resin and biodegradable resin.

The polyester resin used in the present invention is not particularly limited, but polybutylene terephthalate, polytrimethylene terephthalate or a mixture thereof is most preferably used.

More preferably, the polytrimethylene terephthalate is more flexible than other resins, has excellent chemical resistance, elasticity, elastic recovery rate against compression, etc., and has excellent elasticity and resilience. Most preferably used to make bristles.

The biodegradable resin used in the present invention may be categorized into 'synthetic polymer resin' manufactured by chemically biodegradable raw materials through a polymerization process or 'natural polymer resin' manufactured using a natural material as a main component, but is not limited thereto. no.

The synthetic polymer resin may be, for example, polyhydroxybutylate-valerate (PHBV), polyanhydrides, polyphosphazenes, polyorthoesters, polycapro, which is an aliphatic polyester. Lactone (PCL), polylactic acid (PLA), aliphatic polyester (Alipahatc polyestr, AP), polyester urethane (PEU), polybutylene succinate (PBS), polybutylene adipate (PBA), polybutylene adi Pate-terephthalate (PBAT), polybutylene succinate-adipate (PBSA) and polybutylene succinate-terephthalate (PBST), for example, the natural polymer resin can be, for example corn, sugar cane, Hemp, hay, starch, polyhydroxyalkanoate (PHA), collagen, albumin, gelatin and dextran

As an example of the present invention, the cornstalk may be used in the form of a powder pulverized with a corn ball after freeze-drying the cornstalks after corn harvesting and then additionally ground with an air jet mill, but is not limited thereto.

The cornstalk contains abundant cellulose, but the content of lignin deteriorating the physical properties is relatively small, about 10%, and has the physical properties to improve the durability of the blend resin by using cornstalk as a powder to replace conventional chemical synthetic resins with natural polymer resins. Resin composition with excellent physical properties that can be easily used in the manufacture of filaments.

In addition, the natural polymer resin has a disadvantage in that it is difficult to compound with the conventional polymer (compounding) is difficult to mix well, but the cornstalk is a relatively high quality compound because the problem of homogeneity, the difference in volume and specific gravity with the polymer is not large compared to other natural polymers Can be prepared.

In another aspect of the present invention, as mentioned above, in order to achieve the object of providing an environmentally friendly and easy to decompose eco-friendly bristles with a resin composition comprising a polyester-based resin and a biodegradable resin, In manufacturing, when using a biodegradable resin such as corn cob powder at a high weight, in order to overcome the disadvantage that the color of the bristles due to the inherent color of the biodegradable resin, the user may feel rejection, It is possible to provide the bristles having a core-shell structure consisting of a core layer having a different content and a shell layer surrounding the core layer.

 More specifically, it is a bristle of a core-shell structure made of a resin composition containing a blend resin and a binder containing a polyester-based resin and a biodegradable resin, the bristle having a content of a biodegradable resin satisfying the following formula 1 Can be provided.

0.2A≤B≤0.7A

(In Formula 1, A is the content (parts by weight) of the biodegradable resin of the core layer,

Based on the content of 100 parts by weight of the biodegradable resin of the core layer, B is the content (part by weight) of the biodegradable resin of the shell layer.)

The content of the biodegradable resin may be adjusted to satisfy the above formula, and co-extrusion of each resin composition having different contents of the biodegradable resin of the core layer and the shell layer may produce a core-shell filament. Can be.

When the natural polymer resin of the present invention is included at a high weight, the color of the bristles due to the inherent color of the natural polymer resin is made of a filament made of a core layer and a shell layer surrounding the core layer in order to prevent the consumer from being rejected. Made of core-shell filaments,

The core layer contains a high weight of biodegradable resin, and the resin composition is prepared in such a way that the shell layer surrounding the core layer contains a smaller amount of the biodegradable resin than the core layer, so that the biodegradable resin having a unique color may be manufactured at high weight. By using a shell layer containing a small amount of biodegradable resin surrounding the core layer, it is possible to produce a soft and bright colored bristles like conventional bristles.

More preferably, in manufacturing the bristles including a high weight of the natural polymer resin, the color of the bristle due to the inherent color of the natural polymer resin may cause the consumer to be rejected by the shell layer containing a small amount of biodegradable resin By preparing a filament of a core-shell structure surrounding a core layer including a biodegradable resin of, bristles having a soft color like conventional bristles can be manufactured.

Specifically, when manufacturing the bristle of the core-shell structure with the biodegradable resin content of the core layer and the biodegradable resin content of the shell layer satisfying the above [Equation 1], the weight of the biodegradable resin in the core layer of the bristles compared to the shell layer Including, the shell layer has a small amount of biodegradable natural polymer resin and a high weight polyester-based resin compared to the core layer having a shell layer having a color of the existing bristle, the user can prevent the rejection It has the advantage of manufacturing the bristle of the core-shell structure with the combination of.

The present invention may provide a blend resin including the polyester resin and the biodegradable resin in 50 to 99.9 wt% of the polyester resin and 0.1 to 50 wt% of the biodegradable resin, but is not limited thereto. no.

In another embodiment of the present invention, a binder may be further added to increase the mixing power of the blend resin including the polyester-based resin and the biodegradable resin and to impart the bonding stability, but is not limited thereto.

The binder may be used to facilitate the mixing of the biodegradable resin and the polyester-based resin and to impart bonding stability. Specifically, the binder may be polyethylene, polypropylene, polyurethane, polyester, polyamide, silicone, It may be one or more selected from the group consisting of natural rubber and thermoplastic elastomer (TPE), and most preferably polyethylene terephthalate (PET) may be used as a binder, but is not limited thereto.

The thermoplastic elastomer (TPE) is not particularly limited, but may be, for example, styrene butadiene styrene (SBS), thermoplastic polyurethane (TPU), or a mixture thereof, but is not limited thereto.

In addition, by further comprising a thermoplastic elastomer resin as a binder to modify the bond stability or the elasticity and resilience of the bristles, when processed into fine hair, it is possible to provide a more flexible elastic recovery rate, to provide an excellent toothbrush fine bristles.

The present invention may include 1 to 10 parts by weight of the binder based on 100 parts by weight of the blend resin in which the polyester resin and the biodegradable resin are mixed.

When included in less than 1 part by weight of the binder, the blendability and bonding stability of the polyester-based resin and biodegradable resin may be reduced, and when included in more than 10 parts by weight, the purpose of the present invention for producing bristles using environmentally friendly resin May not conform to.

In another aspect of the present invention

a) co-spinning a resin composition comprising a polyester-based resin, a biodegradable resin, and a binder to produce a core-shell filament;

b) stretching the filament after cooling;

c) after the tapering treatment of the filament, planted into a toothbrush;

It can provide a method of manufacturing the bristles including.

The present invention provides a step of co-spinning a resin composition comprising a polyester-based resin, a biodegradable resin and a binder to produce a core-shell filament.

In more detail, in order to manufacture a filament of a core-shell structure consisting of a core layer and a shell layer surrounding the core layer, the following Formula 1 is satisfied.

0.2A≤B≤0.7A

(A in Formula 1 is the content (part by weight) of the biodegradable resin of the core layer,

Based on 100 parts by weight of the biodegradable resin of the core layer, B is the content (part by weight) of the biodegradable resin of the shell layer.)

The first resin composition of the core layer containing the biodegradable resin satisfying the above formula and the second resin composition of the shell layer containing a relatively small amount of biodegradable resin are introduced into the extruder, and the core-shell structure is used. By virtue of this, the dark and dark colored filaments of the core layer containing the heavy weight biodegradable resin can be provided by the shell layer as a bright and soft color filament like the color of the existing bristles.

The cospinning is possible as long as the spinning method commonly used in the same technical field. Due to the co-spinning core-shell filament has a structure consisting of a core layer and a shell layer surrounding the core layer, wherein the spinning temperature can be appropriately controlled by the binder used, preferably may be carried out at 220 ~ 260 ℃. If it is lower than 220 degrees, the resin will not melt sufficiently, resulting in inaccurate core and sheath positioning, and above 260 degrees may affect the added modifier (binder).

Next, the step b) is a step of cooling, stretching and heat-treating the filament of the core-shell structure, and cooling, stretching and heat-treating the filament of the core-shell structure manufactured in the step a) to filament of the core-shell dual structure To prepare.

The cooling, stretching, and heat treatment are not particularly limited, and for example, the filaments extruded and spun in a conventional manner directly below the spinneret may be cooled by passing through a tank containing a fluid. Thereafter, the stretching may be performed, and the stretching process may be a general stretching process, and may be a heat treatment step in the range of 170 to 220 ° C. after stretching, but is not limited thereto. The stretching ratio may be determined by measuring the physical properties of the filament that has passed the heat treatment process, and after stretching, the monofilament may be drawn to a thickness of 0.05-0.3 mm, which may be drawn at a draw ratio of 4 to 6 times. It is not limited to this.

Next, in step c), the filament manufactured in step b) may be tapered, and then wound using a winder to facilitate storage.

  Taping the filament may be carried out by immersion in an alkaline solution, but is not particularly limited.

As an example according to the present invention, the stretched filament may be processed into a bundle, and the one end of the bundle may be immersed in a processing tank in which an alkaline solution is immersed and tapered to a desired length, but is not limited thereto. .

In addition, the alkaline solution may be used caustic soda of 30-60% by weight, it is preferable to heat the temperature to 100-150 ℃ because the temperature to reduce the tapering time and obtain a stable fine hair.

The winding may be a winding step or the winding method may be performed by a conventional method. After the winding, it may comprise a step of manufacturing a toothbrush by planting. The bristles may be manufactured with a fine bristle toothbrush having a length of at least 5 mm and a total length of 15-40 mm.

Hereinafter, in order to measure the physical properties of the bristles prepared according to the following example was measured by the following method.

(The tensile strength)

Tensile strength was measured by using universal testing machine (UTM, Lioyd) with a minimum load of 1N and a load speed of 20cm / min.

The average of the remaining measured values was recorded except for the minimum and maximum values among the values measured and measured seven times under the above conditions.

(Elastic recovery rate (flexion recovery rate))

Flexural recovery was measured according to the KS G 3103 measurement method.

The KS G 3103 is a test of the simulated bending recovery rate, and the measuring method is described with an example,

A) Make a ring that intersects two standard specimen filaments according to the present invention and immerse it in warm water adjusted to 60 ± 2 ° C., and add ² kg of weight per mm (mm ² ) of the filament for 3 minutes.

B) Remove the weight and remove it from the hot water and cut it 30mm from the temperature bending point.

)%의 장소에서 유리면 위에 60분간 방치한 후 열림 각도를 측정하고, 다음 식 1에 의해 굴곡 회복률을 계산한다.C) Remove moisture with filter paper, etc., and then temperature 23 ± 5 ℃ and humidity (

After 60 minutes on the glass surface at the)% of the opening angle is measured, and the bending recovery rate is calculated by the following equation (1).

[식 1]

[Equation 1]

(Equation 1 in the A: bending recovery rate (%), θ: opening angle (˚))

(Biodegradation measurement)

The biodegradability was measured by the method of measuring plastic biodegradability and decay degree (KS M3100-1) under composting conditions specified in Korean Industrial Standards (Technical Standards Publication No. 2002-1298).

Example 1

A first resin composition (core layer) containing 5 parts by weight of PET was obtained based on 100 parts by weight of a blend resin containing 750 g of polytrimethylene terephthalate and 250 g of corn cob powder, and 930 g of polytrimethylene terephthalate and 70 g of corn cob powder. A second resin composition (shell layer) was prepared comprising 5 parts by weight of PET based on 100 parts by weight of the blended blended resin.

The first resin composition was co-spun with a spinning machine having a spinneret having a core-shell structure in which a second resin composition was disposed in a shell layer, thereby preparing a monofilament having a core-shell structure. The spun core-shell structured monofilament was passed through a chiller at 10 ° C. and then drawn at a draw ratio of 5 times. The stretched monofilament was prepared as a bundle, and one end of the bundle was tapered by immersing in an alkali solution at 120 ° C. and 40% concentration. After immersion, washed twice with water, neutralized with dilute sulfuric acid, and washed again, and then wound and wound filaments were cut to 35mm in length to prepare bristles in the form of fine hairs. The physical properties of the microhairs prepared by the above method were measured and recorded in Table 1 below. The application experiments of the prepared microhairs were performed and the results are reported in Table 2.

Example 2

A first resin composition containing 10 parts by weight of PET with respect to 100 parts by weight of the blend resin containing 650 g of polytrimethylene terephthalate and 350 g of corn cob powder was obtained, and a blend resin of 840 g of polytrimethylene terephthalate and 160 g of corn cob powder was mixed. The bristles in the form of microhairs were prepared in the same manner as in Example 1 except that a second resin composition including 10 parts by weight of PET was prepared based on 100 parts by weight. The physical properties of the microhairs prepared by the above method were measured and recorded in Table 1 below. The application experiments of the prepared microhairs were performed and the results are reported in Table 2.

Example 3

A first resin composition containing 40 parts by weight of PET with respect to 100 parts by weight of the blend resin containing 750 g of polytrimethylene terephthalate and 250 g of corn cob powder was obtained, and a blend resin of 930 g of polytrimethylene terephthalate and 70 g of corn cob powder was mixed. The bristles in the form of microhairs were prepared in the same manner as in Example 1 except that a second resin composition including 40 parts by weight of PET was prepared based on 100 parts by weight. The physical properties of the microhairs prepared by the above method were measured and recorded in Table 1 below. The application experiments of the prepared microhairs were performed and the results are reported in Table 2.

Example 4

A first resin composition containing 10 parts by weight of polypropylene was obtained based on 100 parts by weight of the blend resin containing 700 g of polytrimethylene terephthalate and 300 g of corn cob powder, and a blend of 910 g of polytrimethylene terephthalate and 90 g of corn cob powder. The bristles in the form of microhairs were prepared in the same manner as in Example 1 except that a second resin composition including 10 parts by weight of polypropylene was prepared based on 100 parts by weight of resin. The physical properties of the microhairs prepared by the above method were measured and recorded in Table 1 below. The application experiments of the prepared microhairs were performed and the results are reported in Table 2.

Comparative Example 1

A first resin composition containing 8 parts by weight of PET was obtained based on 100 parts by weight of a blend resin containing 600 g of polytrimethylene terephthalate and 400 g of corn cob powder, and a blend resin of 700 g of polytrimethylene terephthalate and 300 g of corn cob powder. A second resin composition containing 8 parts by weight of PET based on 100 parts by weight was prepared.

The first resin composition was co-spun with a spinning machine having a spinneret having a core-shell structure in which a second resin composition was disposed in a shell layer, thereby preparing a monofilament having a core-shell structure. The spun core-shell structured monofilament was drawn through a chiller at 10 ° C. at a draw ratio of 5 times. After stretching and heat treatment at 180 ℃, wound and wound filament was cut to a length of 35mm to prepare a bristles bristle. The physical properties of the microhairs prepared by the above method were measured and recorded in Table 1 below. The application experiments of the prepared microhairs were performed and the results are reported in Table 2.

Comparative Example 2

A first resin composition containing 5 parts by weight of PET was obtained based on 100 parts by weight of the blend resin containing 500 g of polytrimethylene terephthalate and 500 g of corn cob powder, and a blend resin of 600 g of polytrimethylene terephthalate and 400 g of corn cob powder. A bristles in the form of microhairs were prepared in the same manner as in Comparative Example 1 except that a second resin composition including 0.5 parts by weight of PET was prepared based on 100 parts by weight. The physical properties of the fine bristles for toothbrushes prepared by the above method were measured and recorded in Table 1 below. The application experiments of the prepared microhairs were performed and the results are reported in Table 2.

Comparative Example 3

Conventional general toothbrushes made with conventional general nylon wool were used.

TABLE 1

As a result of Table 1, the tensile strength (cN) and the flexural recovery rate (%) of the bristle bristles manufactured according to the present invention has excellent elasticity and resilience, as in the conventional bristles It was confirmed. However, in the case of Example 3, as the content of PET exceeds the range of the present invention, it can be seen that the biodegradability is somewhat reduced.

In addition, in the case of Comparative Example 2, it was confirmed that the physical properties such as tensile strength of the filament made of a resin composition containing PET as a binder less than the scope of the present invention is sharply reduced, the conventional made of the conventional nylon material of Comparative Example 3 In general toothbrushes, the physical properties of tensile strength and elasticity loss ratio were good, but there was little biodegradability.

TABLE 2

* Evaluation standard

5: very good, 4: good, 3: normal, 2: bad, 1: very bad

As shown in Table 2, the satisfaction of the panel items of Table 2 was performed after using the toothbrush manufactured in the present invention and the existing toothbrush for a certain period (7 days) as shown in Table 2 above. Satisfaction of the toothbrush prepared according to the present invention was generally good, but in Comparative Examples 1 and 2, the biodegradable resin content of the shell layer compared to the biodegradable resin content of the core layer exceeded the scope of the present invention, and thus the overall color of the brush head. It was evaluated that this darkness caused the user to feel rejected.

Claims (14)

Core-shell bristle is made of a resin composition containing a blend resin and a binder comprising a polyester-based resin and a biodegradable resin, Toothbrush, characterized by satisfying the following formula 1. 0.2A≤B≤0.7A (In Formula 1, A is the content (parts by weight) of the biodegradable resin of the core layer, Based on the content of 100 parts by weight of the biodegradable resin of the core layer, B is the content (part by weight) of the biodegradable resin of the shell layer.) The method of claim 1, The polyester resin is polybutylene terephthalate, polytrimethylene terephthalate or a mixture thereof. The method of claim 1, The biodegradable resin is polyhydroxybutylate-valerate (PHBV), polyanhydrides, polyphosphazenes, polyorthoesters, polycaprolactone (PCL), polylactic acid ( PLA), polybutylene succinate (PBS), polybutylene adipate (PBA), polybutylene adipate-terephthalate (PBAT), polybutylene succinate- adipate (PBSA), polybutylene succinate -Brush heads characterized in that one or more selected from terephthalate (PBST), corn stalks, sugar cane, hemp, hay, starch, polyhydroxyalkanoate (PHA), collagen, albumin, gelatin and dextran. The method of claim 1, The binder is a bristle, characterized in that at least one selected from the group consisting of polyethylene, polypropylene, polyurethane, polyester, polyamide, silicone, natural rubber, thermoplastic elastomer. The method of claim 4, wherein A brush head comprising 1 to 10 parts by weight of the binder with respect to 100 parts by weight of the blend resin in which the polyester resin and the biodegradable resin are mixed. The method of claim 4, wherein And the thermoplastic elastomer is styrene butadiene styrene (SBS), thermoplastic polyurethane (TPU) or a mixture thereof. a) co-spinning a resin composition comprising a polyester-based resin, a biodegradable resin, and a binder to produce a core-shell filament; b) stretching the filament after cooling; c) after the tapering treatment of the filament, planted into a toothbrush; Method of producing a bristle of the core-shell structure comprising a. The method of claim 1, The bristle of the core-shell structure is a manufacturing method of the bristles satisfying the following formula. 0.2A≤B≤0.7A (A in Formula 1 is the content (part by weight) of the biodegradable resin of the core layer, Based on 100 parts by weight of the biodegradable resin of the core layer, B is the content (part by weight) of the biodegradable resin of the shell layer.) The method of claim 7, wherein The polyester-based resin is a polybutylene terephthalate, polytrimethylene terephthalate or a mixture thereof, the manufacturing method of the bristles. The method of claim 8, The biodegradable resin is polyhydroxybutylate-valerate (PHBV), polyanhydrides, polyphosphazenes, polyorthoesters, polycaprolactone (PCL), polylactic acid ( PLA), polybutylene succinate (PBS), polybutylene adipate (PBA), polybutylene adipate-terephthalate (PBAT), polybutylene succinate- adipate (PBSA), polybutylene succinate -Brush heads characterized by one or more selected from terephthalate (PBST), corn stalks, sugar cane, hemp, hay, starch, polyhydroxyalkanoate (PHA), collagen, albumin, gelatin and dextran Manufacturing method. The method of claim 7, wherein The binder is polyethylene, polypropylene, polyurethane, polyester, polyamide, silicone, natural rubber, thermoplastic elastomer, characterized in that at least one selected from the group consisting of thermoplastic elastomer. The method of claim 7, wherein A method of producing a bristles, characterized in that it comprises 1 to 10 parts by weight of the binder with respect to 100 parts by weight of the blend resin mixed with the polyester resin and the biodegradable resin. The method of claim 11, And the thermoplastic elastomer is styrene butadiene styrene (SBS), thermoplastic polyurethane (TPU) or a mixture thereof. A toothbrush in which a filament is planted according to the manufacturing method of any one of claims 7 to 13.