KR20190021788A - Fine toothbrush bristles and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a polyketone micro-bristle and a production method thereof and, more specifically, to a polyketone micro-bristle of a composite structure having a double structure or a multiple structure by comprising a polyketone resin, wherein the produced micro-bristle has more improved durability by being tapered and having more improved detergency, and to a production method thereof.

Description

TECHNICAL FIELD [0001] The present invention relates to a fine bristles and a method for manufacturing the same. More particularly,

The present invention relates to a polyketone micro-bristles and a method of manufacturing the same. More particularly, the present invention relates to a micro-brush bristle having poly-ketone micro-bristles including a polyketone resin and having a composite structure having a double structure or a multimodal structure and tapering the same to further improve durability and further improve cleaning power and a manufacturing method thereof .

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 is improved in washing power, rigidity, durability and heat resistance of bristles by using a polyketone resin, has high chemical resistance which shows excellent resistance to most chemicals, In addition, it is an object of the present invention to provide a micro-bristles having a tooth cleaning ability which is further increased in spite of long-term use, and a manufacturing method thereof.

Further, the present invention provides a micro-bristle having a core-sheath structure by extrusion-spinning a polyketone resin and a thermoplastic resin together to provide a fine bristle having a core-sheath structure having excellent cleaning power against a narrow region such as a cervical region and a root region, The object of the present invention is to provide a bristle brush which has less irritation in the mouth and a feeling of being soft.

The present invention also provides microbrush bristles having branching hairs having a structure in which two or more, more particularly, two to twenty, multi-cores of the core portion are branched by two or more ends to form micro bristles each having a unit area or per unit filament The purpose of this study is to improve the cleansing power of the tooth surface and the occlusal surface as well as the narrow parts such as the cervical part and the tooth part by increasing the number and to maintain the hypopharyngeal and flexibility in the oral cavity.

The present invention also relates to a resin composition comprising a polyketone resin as a core part and a resin containing at least one selected from a thermoplastic resin, a thermoplastic elastomer and a rubber except polyketone as a cis portion, The polyketone core portion is exposed to the outside through the end portion of the sheath to improve the cleaning power by various forms of the core portion and the polyketone resin is durable even if it is used for a long time due to the durability of the polyketone resin. The present invention also provides a method for producing the bristles.

In addition, since the core part including the polyketone resin contains the inorganic particles as the crater-forming material, the inorganic particles on the surface are desorbed due to the use of the toothbrush for a long period of time and the surface area is further increased. The present invention provides a method for manufacturing a microbrush and a method for manufacturing the microbrush. The present invention provides a microbrush and a method for manufacturing the microbrush according to the present invention, wherein the surface of the polyketone micrometer protrudes outward to form a crater, .

Another object of the present invention is to provide a micro-bristles having a tooth cleaning ability which is further increased despite long-term use and which has a soft touch and a method for manufacturing the same.

Another object of the present invention is to provide a novel microfibre bristle with a novel concept that can be manufactured in a fine state to further improve detergency in the teeth or the cervical region and relieve irritation to the gum, and a method for manufacturing the same.

In order to achieve the above object, one aspect of the present invention includes a core portion including a polyketone resin and a sheath portion including any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber, And the core portion may include polyketone micrometry exposed to the outside from the longitudinal end portion of the sheath portion.

In one aspect of the present invention, the core portion may be a tapered shape in which the cross-sectional area decreases toward the end portion.

In one aspect of the present invention, the core portion may further comprise inorganic particles which are crater-forming materials.

In one embodiment of the present invention, the externally exposed polyketone micro-lens may have a plurality of craters on its surface.

In one embodiment of the present invention, the inorganic particles may have an average particle diameter of 0.3 to 20 mu m.

In one aspect of the present invention, the core portion may include at least one or more core portions inside the sheath portion.

In one aspect of the present invention, the core portion may be in the form of two to six bars penetrating the inside 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 diameter of the sheath portion is 0.05 to 0.5 mm, and the diameter ratio of the core portion and sheath portion 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.

In an aspect of the present invention, the length of the core portion protruding from the longitudinal end of the sheath portion may be 1 to 10 mm.

Another aspect of the invention is a toothbrush comprising the microbrush.

Another aspect of the invention is a method of making a microbrush,

a) preparing a core-sheath filament by co-extruding a core portion containing a polyketone resin and a sheath portion containing any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber;

b) cutting the filament of the core-cis structure; And

c) dipping the one end or both ends of the cut filaments into a first etching solution capable of tapering the resin of the sheath to taper the sheath portion, and passing the sheath portion through a lengthwise end portion of the sheath portion to a polyketone Comprising the steps of: preparing a microbranched bristle including a fine hair;

.

In an embodiment of the manufacturing method of the present invention, after step (c), d) a step of dipping the core part exposed to the outside into a second etching solution capable of polishing or tearing the polyketone resin May include.

In one embodiment of the manufacturing method of the present invention, the core portion further includes inorganic particles, and a crater may be formed on the surface of the core portion by the inorganic particles when immersed in the first etching solution and the second etching solution.

In one embodiment of the production method of the present invention, the second etching solution is any one or two or more organic solvents selected from hexafluoroisopropanol, m-cresol, 3-chlorophenol, pyrrole, resorcinol, Calcium salt, lithium salt, and the like.

In one embodiment of the manufacturing method of the present invention, the step c) may be such that one end of the cut filament is first dipped in the first etching solution, and the other end is dipped in the first etching solution.

In one embodiment of the production method of the present invention, the first etching solution may be an alkali solution or an acid solution.

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 and the resin except for the polyketone resin is included in the sheath portion, the sheath portion tapers when dipped in the etching solution for tapering the sheath portion, so that the core portion protrudes from the end portion of the sheath portion, Thereby providing a bristle brush which is excellent in cleansing power for narrow areas such as the cervical portion and the teeth, and has a thin and flexible end, less irritation in the mouth, and a soft touch feeling.

In addition, when the number of the core portions is two or more, it is possible to provide the micro bristles having branched hairs each having a structure in which the end portions are branched into two or more, and the number of fine tips per unit area or per unit filament is increased, The cleansing force against the tooth surface and the occlusal surface can be further improved, and the oral hygroscopicity and flexibility can be maintained.

Further, the cleaning ability can be further improved by improving the surface area according to various forms of the core part, and the cleaning power is further improved when the craters are formed on the surface of the polyketone micro-lenses exposed to the outside.

In addition, since the polyketone resin is excellent in durability, the bristles are not bent even when used for a long period of time, so that the bristles are less widened and the appearance 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 an embodiment of the bristles of the present invention.
14 to 18 show an embodiment of the microbrush 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 conducted studies to improve the properties of bristles of a thermoplastic resin such as a polyester resin and a polyamide resin, such as detergency, abrasion resistance and flexibility. As a result, it has been found that by producing bristles using a polyketone resin, Durability, strength, abrasion resistance and chemical resistance can be further improved. Further, it has been found that the core-sheath structure can be manufactured with different colors of the core portion and the sheath portion, or by variously changing the shape of the core portion, .

It is also preferable that the polyketone resin is contained in the core portion and one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber other than polyketone is contained in the sheath portion so as to have a core- The present invention has been accomplished on the basis of finding that it is possible to further improve the washing power and the flexibility while utilizing the advantages of the physical properties possessed by the polyketone resin as it is.

Further, when the substrate is immersed in the etching solution to taper the sheath portion, the core portion is not etched but only the sheath portion is etched, so that the core portion can be exposed to the outside from the longitudinal end portion of the sheath portion to form polyketone micro- It has been found that the detergency can be further improved by various shapes and various colors such as a circle, an ellipse, a dumbbell, a semicircle, a fan, a gull, and a polygon.

In addition, by including inorganic particles in the core portion, the inorganic particles are desorbed as a user uses the toothbrush to form a crater in the place where the inorganic particles are present, thereby increasing the surface area and further improving the cleaning power. It is possible to form a crater in the place where the inorganic particles are present in the process of tamping the dirt, and thus the bristles with improved cleaning ability can be provided, thus completing the present invention.

One aspect of the present invention includes a core portion including a polyketone resin and a sheath portion including any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber, wherein the sheath portion has a tapered portion Wherein the core portion comprises polyketone micro-wrist exposed to the outside from the longitudinal end of the sheath portion.

In addition, the micro-bristles of the present invention may be composite micro-bristles in which only the end portion of the sheath is tapered or both the sheath portion and the exposed polyketone micro-fine portion are tapered.

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. At least one core portion may be included in the sheath portion. More specifically, the core portion may be 1 to 20, more specifically 2 to 6.

In addition,

(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 0.05 to 0.5 mm, more specifically 0.1 to 0.3 mm, and the diameter ratio D ₁ : D ₂ of the core and sheath may be 1: 1.2 to 1: 5, more specifically from 1: 1.2 to 2, and it is possible to provide the bristles excellent in feeling and durability within the above range, but the present invention is not limited thereto. In addition, the total length of the bristles in the longitudinal direction may be 10 to 40 mm and is suitable for use as a bristle in the range, but is not limited thereto.

Figs. 14 to 18 show one embodiment of the microbrush of the present invention. As shown in Figs. 14 to 18, a core part 10 comprising a polyketone resin and a core part 10 made of a thermoplastic resin, a thermoplastic elastomer, And the sheath portion 20 has a tapered shape in which the cross-sectional area decreases toward the longitudinal end portion, and the core portion 10 has a lengthwise end portion H ₁ of the sheath portion, And may be exposed to the outside to form polyketone micro-crystals 30. Also, although not shown, the polyketone micro-crystals 30 may include inorganic particles and may be formed with a crater.

In one aspect of the present invention, the length (H ₂ ) of the polyketone micro-protrusion 30 protruding from the longitudinal end portion H ₁ of the sheath portion may be 1 to 10 mm, more preferably 2 to 6 mm. The polyketone micrometer having excellent durability within the above range and having improved cleaning ability can be formed, but the present invention is not limited thereto.

16 to 18, the polyketone microemic 30 formed by protruding from the longitudinal end portion H _{1 of the} sheath portion of the core portion 10 may be tapered.

Also, as shown in FIG. 18, the polyketone micro-caliper 30 may have a plurality of craters 40 formed on its surface.

In one aspect of the present invention, 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 polyketone resin. As described above, the resin of the sheath is dipped into the tapered structure as described above, and the core part is exposed, thereby exhibiting the durability of the core part due to the polyketone resin, and the cleaning ability is further improved by various forms of the core part Can be expressed.

The resin used for the sheath portion can be used without limitation, except for polyketone, as long as it is a resin commonly used in bristles. Specifically, it is not particularly limited as long as it is selected from a thermoplastic resin, an elastomer, a rubber or the like in that extrusion processing is possible, for example. 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 has not only excellent durability and heat resistance, but also has high chemical resistance and anti-microbial property which show excellent resistance to most chemicals, and exhibits abrasion resistance equivalent to or higher than 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 .

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 content may be, but is not limited to, 0.1 to 10% by weight, more specifically 2 to 8% by weight, based on 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.

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 embodiment of the present invention, the core portion may further include inorganic particles, which are crater-forming substances, so as to further form a crater on the surface of the polyketone micro-crystals. The inorganic particles may have an average particle size of 0.3 to 20 μm, preferably 0.5 to 10 μm, more preferably 0.8 to 8 μm, and the content thereof is 0.05 to 10% by weight, more preferably 0.1 to 5% by weight, % ≪ / RTI > by weight. In order to further improve the surface area by forming a plurality of craters on the surface of the polyketone micrometer in the above range, it is not limited thereto.

The kind of the inorganic particles contained in the core part is not limited and specific examples include sodium carbonate, sodium hydrogencarbonate, zeolite, silica, alumina, sodium chloride, calcium carbonate, calcium phosphate, silica gel, titanium dioxide, zinc oxide, magnesium oxide , Silicon dioxide, and aluminum oxide may be used, and one or two or more of them may be mixedly used.

According to an embodiment of the present invention, the bristles may be manufactured by melt-kneading and co-extruding a resin used for a core portion and a sheath portion using a multiple extrusion method. More specifically, a core resin composition comprising a polyketone and a poly Extruding and extruding the sheath resin composition containing other resin except for the ketone by multi-extrusion. That is, it may include a melt extrusion step, an extrusion spinning step, and a cooling and stretching step. For example, the core-sheath structure can be manufactured through a process of melting and extruding using a general spinning method such as melt spinning, dry spinning, wet spinning, wet spinning or the like. In this case, the spinneret provided in the spinner may have various forms such as a circle, a dumbbell, a cross, a disk, a gull, a triangle, a square, a diamond, and a cone.

The filament of the core-sheath structure thus produced is cut to a suitable length of the bristles, cut to an appropriate length if necessary, and tapered by inserting the end portion into a tapering solution capable of tapering the resin of the sheath. And the ketone core portion is exposed to form a polyketone micro-micro-fine.

Further, functional materials such as the above-mentioned antibacterial substance, inorganic particles, dyes and pigments may be further added during the preparation of the spinning solution, and the core part and the shell part may be spun to have different colors or different functional materials.

Hereinafter, a method of manufacturing the micro-bristles of the present invention will be described in more detail.

One aspect of the method of making a microbrush of the present invention comprises

a) preparing a core-sheath filament by co-extruding a core portion containing a polyketone resin and a sheath portion containing any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber;

b) cutting the filament of the core-cis structure; And

c) dipping the one end or both ends of the cut filaments into a first etching solution capable of tapering the resin of the sheath to taper the sheath portion, and passing the sheath portion through a lengthwise end portion of the sheath portion to a polyketone Comprising the steps of: preparing a microbranched bristle including a fine hair;

. ≪ / RTI >

In addition, the present invention may further include inorganic particles in the core portion in the step a), if necessary.

That is, one aspect of the method of manufacturing the microbranched bristles of the present invention

a) preparing core-sheath filaments by co-extruding a core portion comprising a polyketone resin and an inorganic particle, and a sheath portion containing one or more selected from thermoplastic resin, thermoplastic elastomer and rubber;

b) cutting the filament of the core-cis structure; And

c) dipping the one end or both ends of the cut filaments into a first etching solution capable of tapering the resin of the sheath to taper the sheath portion, and passing the sheath portion through a lengthwise end portion of the sheath portion to a polyketone Comprising the steps of: preparing a microbranched bristle including a fine hair;

. ≪ / RTI >

The method may further comprise d) dipping the core portion exposed to the outside into a second etching solution capable of tapering or polishing the polyketone resin to perform a tapering treatment so that the composite fine bristles . ≪ / RTI >

That is, one aspect of the method for manufacturing the composite micro-bristles of the present invention

a) preparing a core-sheath filament by co-extruding a core portion containing a polyketone resin and a sheath portion containing any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber;

b) cutting the filament of the core-cis structure;

c) dipping the one end or both ends of the cut filaments into a first etching solution capable of tapering the resin of the sheath to taper the sheath portion, and passing the sheath portion through a lengthwise end portion of the sheath portion to a polyketone Comprising the steps of: preparing a microbranched bristle including a fine hair; And

d) dipping the core portion exposed to the outside into a second etching solution capable of polishing or tearing the polyketone resin, and tapering the core portion;

. ≪ / RTI >

According to another aspect of the present invention, there is provided a method of manufacturing a composite micro-bristles, wherein the core part further comprises inorganic particles in the step a), and a crater is formed on the surface of the core part by the inorganic particles upon immersion in the second etching solution .

That is, one aspect of the method for manufacturing the composite micro-bristles of the present invention

a) preparing core-sheath filaments by co-extruding a core portion comprising a polyketone resin and an inorganic particle, and a sheath portion containing one or more selected from thermoplastic resin, thermoplastic elastomer and rubber;

b) cutting the filament of the core-cis structure;

c) dipping the one end or both ends of the cut filaments into a first etching solution capable of tapering the resin of the sheath to taper the sheath portion, and passing the sheath portion through a lengthwise end portion of the sheath portion to a polyketone Comprising the steps of: preparing a microbranched bristle including a fine hair; And

d) dipping the exposed core in a second solution capable of dissolving the polish or polyketone resin and tapering it;

. ≪ / RTI >

Hereinafter, each of the above steps will be described in more detail.

The step a) is a process for producing a filament of a core-sheath structure, wherein a polyketone resin is used as a core part and a resin other than the polyketone resin is used as a sheath, and the resultant is placed in a radiator heated to 180 to 300 캜, Extruded through a nozzle formed with a large number (for example, 2 to 300) of spinnerets (for example, 0.5 to 2 mm in diameter). It may include a stretching process to increase the flexibility and strength of the core-sheath filament after extrusion. The stretching process is determined by the winding speed and is preferably 1 to 20 times at a temperature of 150 to 220 ° C .

Although the stretching process is not particularly limited, it may be performed one to four times. The thickness of the core-sheath filament may be 0.05 to 0.5 mm in diameter. If it is less than 0.05 mm, the strength may be lowered. If it is more than 0.5 mm, undrawn phenomenon may occur and the penetration force between the teeth may be lowered at the time of brushing, so that the above range is preferable.

The step b) is a step of cutting the filament of the core-sheath structure to have a length for forming the hair on the bristles. Hereinafter, the filament of the cut core-sheath structure is referred to as a core-sheath structure for convenience.

More specifically, the core-cis filaments may be prepared by spinning in the step (a), and then bundling the core-cis filaments with a bundle if necessary. The bundle may have a thickness of 40 To 60 mm is preferable for ease of later processing, but is not limited thereto. The bundle is tapered so as to expose the polyketone core portion to the end. To this end, the core-sheath filament is cut to a length equal to the length of the finished product, or is cut to a length of about 1 to 20 mm Filament, that is, a core-cis structure. The core-sheath structure fabricated as described above is manufactured from a toothbrush in a toothbrush bag, and therefore, it is preferable to adjust the length of the bundle in consideration of this.

Next, step c) is a step of tapering the sheath to expose the polyketone micrometer to the end of the core-sheath structure cut in step b).

The tapering step of the sheath is a step of dipping one end or both ends of the cut filaments into a processing tank containing the first etching solution to taper it. The kind of the first etching solution may be determined depending on the type of the polymer resin forming the sheath portion, and is not limited as long as it can dissolve the polymer resin used in the sheath portion. Specifically, for example, in the case of a polyester resin, an alkali solution may be used, and in the case of a polyamide resin, an acid solution may be used. In addition, organic solvents such as toluene and benzene may be used, but the present invention is not limited thereto. More specifically, when the sheath is a polyamide such as nylon, an acidic solution of 10 to 30% by weight of hydrochloric acid, nitric acid, sulfuric acid, or the like is preferably used. When the polymeric resin is polyester, 20 to 40% , An alkali solution such as ammonium hydroxide, calcium hydroxide and potassium hydroxide is preferably used. 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 degree of tapering in the length direction and the thickness direction 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 core-cis structure tapered by repeating the dipping is gradually tapered toward the other end, and a tapered structure of the cis resin layer having a desired end portion in the present invention can be obtained.

The tapering may reduce the tapering cross-sectional area of the cis resin layer of the structure and form irregularities on the surface of the composite bristles to obtain a desired cleaning power 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 sheath portion.

In one embodiment of the present invention, in the step c), one end of the cut filament may be first dipped in the first etching solution, and the other end may be dipped in the first etching solution.

That is, the core-sheath filament is bundled and cut to form a core-sheath structure, and one end of the core-cis filament is dipped in a processing tank containing the first etching solution. Next, the other end is immersed in a processing tank containing the first etching solution through the same process. When the tapering process is completed, the hydrolyzed portion is washed and removed to form a tapered sheath portion. The washing may further include washing the flowing water two or three times, and neutralizing the washing process.

The reason why the sheath portion can be tapered as described above is that the polyketone resin used in the core portion is resistant to acid or alkali, and tapering of the core portion is substantially not caused.

Accordingly, in the present invention, by introducing a means for tapering the polyketone micromes exposed from the end portion as in the step d), the ends of the rigid polyketone are tapered to have a fine structure to contact the gums and teeth , While the fine portion of the end portion gives a soft feeling, the rigidity of the body portion is maintained, and the feeling of use is good without deteriorating the cleaning effect.

The tapering of the exposed polyketone micro-crystals can be performed by a process in which the core portion is briefly contacted with a high-speed rotating polisher or immersed in a second etching solution capable of dissolving the polyketone resin for 10 to 60 seconds, This can be done by repeating. That is, by repeatedly immersing the surface of the polyketone microcrystalline core part in a solution, a filament can be produced which gradually becomes thinner at the end portion. As the solvent for dissolving the polyketone, organic solvents such as hexafluoroisopropanol, m-cresol, 3-chlorophenol, pyrrole and resorcinol can be used. In addition, an aqueous solution containing at least one metal salt selected from the group consisting of a zinc salt, a calcium salt and a lithium salt can be used. Specific examples thereof include zinc bromide, zinc chloride, zinc iodide, calcium bromide, calcium chloride, calcium iodide, lithium bromide And the like.

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 0.2 mm. As a result, the flexural recovery was 45%.

Polybutyleneterephthalate (ULTRADUR® B 4500, manufactured by BASF) was melt-extruded and stretched in the same manner as in Example to prepare a single filament having a thickness of 0.2 mm. As a result, the flexural recovery rate was 61%.

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

2) Intensity (N) and elongation (%)

The strength and elongation of the bristles were measured using a universal testing machine in accordance with KS K 0412.

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]

(In the above formula 1, L1 = the distance between the two ends of the mock before brushing, and L2 = the maximum widening distance of the mockup 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]

Polyketone resin (POKETONE M230A) was used as a core forming material, and polybutylene tererephthalate (BASF, ULTRADUR B 4500) was used as a sheath forming material. The core-forming material was placed in a first extruder at a temperature of 245 DEG C and the sheath-forming material was fed into a second extruder at a temperature of 260 DEG C and co-extruded through a die having a mold structure as shown in Fig. 1 to form a core- Extruded and spun. 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. At this time, the diameter of the core portion was 75 mu m. The resulting bundle was cut into a length of 30 mm, and one end of the bundle was tapered by dipping it in a potassium hydroxide solution at a concentration of 30% at 120 ° C. Immersion was repeated twice. The other end of the bundle after the immersion was not tapered was repeatedly tapered in the same manner as the tapering process. The tapered filament was washed twice with flowing water, neutralized with dilute sulfuric acid, and then rinsed again. Both ends of the sheath were tapered, and a double-faced fine bristles with polyketone micro-protrusions protruded by tapering of the sheath was produced.

[Example 2]

Example 1 was repeated except that 99.5 wt% of polyketone resin (POKETONE M230A) and 0.5 wt% of calcium carbonate having an average diameter of 1 mu m were used as the core part forming material in Example 1, Two-sided fine bristles were produced in the same manner.

[Example 3]

In the double-sided micro-bristles of Example 1, a step of processing the polyketone core portion protruded from the end portion of the sheath portion was further performed. The polyketone core portion of one bundle was processed by immersion in an aqueous solution of 80 DEG C containing 40 wt% and 22 wt% of calcium chloride and zinc chloride, respectively, and the immersion was repeated five times. The other end of the immersed bundle was processed by repeating the same process. The finished filament bundle was washed twice with flowing water to prepare a double-sided microbrush having a polyketone core portion.

[Example 4]

In Example 1, double-sided micro-bristles were produced in the same manner as in Example 1, except that the filaments having a tetra-core structure were coextruded in a composite die having a tetra-core mold structure as shown in Fig. 4 . The thickness of the prepared filament was 0.2 mm, the same as Example 1, but the diameter of each of the four cores was made to be 60 탆.

[Comparative Example 1]

Polyamide (Zytel®) alone was melted at 250 ° C. and co-extruded from a die having a mold structure as shown in FIG. 1 to extrude and spun the core-sheath filaments. Two-sided bristles were produced without further tapering at both ends of the filament. Other methods were set in the same manner as in Example 1.

[Comparative Example 2]

Polybutyleneterephthalate (BASF, ULTRADUR B 4500) was melted at 260 占 폚 alone and co-extruded from a die having a mold structure as shown in Fig. 1 to extrude the core-sheath filaments. Other methods were set up in the same manner as in Example 1, and double-sided micro-bristles were produced in which core / sheath portions were simultaneously tapered.

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
(N) Shindo
(%) Wake
(%) Rating 10000 times 20,000 times 30000 times Brushing Tooth cleaning effect Mom tenderness Example 1 54 15.0 31 11 22 29 4.3 4.5 4.7 Example 2 53 14.7 31 13 25 33 4.5 4.8 4.7 Example 3 57 14.9 32 8 18 24 4.5 4.5 4.5 Example 4 52 14.0 35 9 19 27 4.6 4.9 4.8 Comparative Example 1 44 10.2 43 72 82 95 3.3 3 2.2 Comparative Example 2 61 13.1 30 11 20 30 4 4.2 4.3

10: core part
11: center
12: wing portion
13: Friction projection
20: Shebu
30: Polyketone fine grain
40: Crater

Claims (19)

A core portion including a polyketone resin, and a sheath portion containing any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber,
The sheath has a tapered shape in which the cross-sectional area decreases toward the longitudinal end,
Wherein the core portion includes polyketone micro-lenses exposed outwardly from a longitudinal end portion of the sheath portion. The method according to claim 1,
Wherein the core portion has a tapered shape in which the cross-sectional area decreases toward the end portion. The method according to claim 1,
Wherein the core portion further comprises inorganic particles that are crater forming materials. The method of claim 3,
Wherein the polyketone micrometry exposed to the outside has a plurality of craters on its surface. The method of claim 3,
Wherein the inorganic particles have an average particle diameter of 0.3 to 20 占 퐉. The method according to claim 1,
Wherein at least one core portion is contained in the sheath portion. The method according to claim 6,
Wherein the core portion is in the form of two to six bars extending through the interior of the sheath. The method according to claim 6,
Wherein the core portion and the sheath portion are each selected from a circle, an ellipse, a dumbbell, a semicircular, a fan, a gull, and a polygon in cross section. 9. The method of claim 8,
Wherein the polygon is selected from the group consisting of triangular, square, pentagonal, hexagonal, star, cross, and rhombic. The method according to claim 1,
Wherein the sheath has a diameter of 0.05 to 0.5 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. The method according to claim 1,
And the length of the polyketone micro-protrusion protruding from the longitudinal end of the sheath is 1 to 10 mm. 12. A toothbrush comprising the microbrush of any one of claims 1 to 12. a) preparing a core-sheath filament by co-extruding a core portion containing a polyketone resin and a sheath portion containing any one or two or more selected from a thermoplastic resin, a thermoplastic elastomer and a rubber;
b) cutting the filament of the core-cis structure; And
c) dipping the one end or both ends of the cut filaments into a first etching solution capable of tapering the resin of the sheath to taper the sheath portion, and passing the sheath portion through a lengthwise end portion of the sheath portion to a polyketone Comprising the steps of: preparing a microbranched bristle including a fine hair;
/ RTI > of claim 1, 15. The method of claim 14,
Further comprising the step of d) dipping the core portion exposed to the outside into a second etching solution capable of polishing or tearing the polyketone resin to perform tapering after the step c). 15. The method of claim 14,
Wherein the core portion further comprises inorganic particles,
Wherein a crater is formed on the surface of the core part by the inorganic particles when immersed in the first etching solution and the second etching solution. 16. The method of claim 15,
Wherein the second etching solution is any one selected from the group consisting of hexafluoroisopropanol, m-cresol, 3-chlorophenol, pyrrole and resorcinol, or any one selected from a zinc salt, a calcium salt, Or an aqueous solution containing at least two metal salts. 15. The method of claim 14,
Wherein the step (c) comprises immersing one end of the cut filament first in the first etching solution, and then immersing the other end in the first etching solution. 15. The method of claim 14,
Wherein the first etching solution is an alkali solution or an acid solution.

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