JP2005270366A - Oral cavity cleaning tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oral cavity cleaning tool having brush bristles used as an oral cavity cleaning tool such as a toothbrush or an interdental brush, in which flexing recovering characteristics or flexibility of polytrimethylene terephthalate is not impaired, and fracture of the brush bristles is prevented even if it is used for a long period of time. <P>SOLUTION: The brush bristles 4 are formed of synthetic resin monofilament composed of 40-60 wt.% of polytrimethylene terephthalate and other polyester resin having higher rigidity, preferably polybutylene terephthalate. The brush bristles are planted at least in part of bristle planting holes 3 provided on a bristle planting base 2 of a handle 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an oral cleaning tool such as a toothbrush and an interdental brush. More specifically, the present invention is excellent in durability and controls plaques such as interdental parts, gingival marginal parts, and pits and fissures of molars. The present invention relates to an oral cleaning tool having excellent cleaning properties for difficult parts.

  In caries and periodontal diseases, which are the main dental diseases, it is known that the main cause of inflammation and destruction of tissues in the oral cavity is bacteria in the oral cavity. Effective prevention of these diseases is daily mechanical and chemical plaque control. The parts that are difficult to control plaque as the risk of developing caries and periodontal disease are interdental, gingival margins, and pits and fissures in the molars, but especially in mechanical plaque control, a toothbrush It is important for the product design of the oral cleaning tool whether the bristles of the oral cleaning tool such as the interdental brush reach these sites where plaque control is difficult and the plaque can be efficiently removed.

  The site where plaque control is difficult as described above is a site where brush hairs are difficult to reach by cleaning with a conventional toothbrush. Therefore, in consideration of the above-mentioned conditions, in order to improve the cleanability of parts that are difficult to control plaque in oral cleaning tools such as toothbrushes and interdental brushes, filament materials that have been conventionally used as brush hairs, primary filaments Various ideas have been made for secondary processing, brush hair flocking patterns, hair cutting shapes of the flocked portions, and the like.

  For example, conventionally, as a filament material for brush hair of an oral cleaning tool, a plurality of resins such as a brush made of a monofilament made of a mixture of polybutylene terephthalate and a polyester elastomer (see Patent Document 1) is blended. A technique for improving the bending recovery and flexibility of brush hair has been proposed. Further, a brush is disclosed in which the elastic recovery rate of the brush hair is improved by using polytrimethylene terephthalate (polypropylene terephthalate) as a main component of the filament (see Patent Document 2). The brush bristle having polytrimethylene terephthalate as a main component has been found to have excellent bend recovery, and a brush filament having a predetermined bend recovery rate with this as a main component is also disclosed (patent) Reference 3). Furthermore, by utilizing the bending recovery property of the filament made of polytrimethylene terephthalate, the diameter of the filament used for the toothbrush can be reduced by using the filament as it is or by coextrusion, and the tooth surface A toothbrush having an increased contact area with the brush and improved cleaning properties has also been proposed (see Patent Document 4).

  As for the shape of the bristle, in mechanical plaque control, it is important to make the bristle reach a site that is difficult to reach with a conventional toothbrush, so the entire filament that becomes the bristle and its tip are thinner. Those are preferred. However, on the other hand, reducing the diameter of the filament as a whole not only reduces the durability, which is the basic performance of the toothbrush, but also improves the reach to the part that is difficult to control plaque as the diameter decreases, but the rigidity of the filament As a result, the cleanability of the site where plaque control is difficult is reduced. Moreover, when the rigidity of the filament is lowered, for example, when the filament tip is secondarily tapered by machining, the workability is lowered. For example, as a tip processing technique of a filament used as a brush bristles of an oral cleaning tool such as a toothbrush, various toothbrushes in which the taper shape of the filament tip portion is variously devised have been proposed (see, for example, Patent Documents 5 to 7). ). However, in these toothbrushes, since the taper shape is deeply formed from the filament tip to the base end, the reachability to the plaque-controllable part such as the interdental part and the gingival margin part is enhanced, but on the other hand Due to the decrease in filament rigidity, the cleanability of the entire oral cavity, such as the smooth surface of the crown, decreased, and the basic function of the toothbrush was insufficient.

JP-A-61-90877 JP-A-8-173244 JP 2003-245133 A JP-T-2001-511379 JP-A-6-141923 JP-A-10-57149 JP 2000-14447 A

  As described above, synthetic resin monofilaments made of polyester resins such as polytrimethylene terephthalate and polybutylene terephthalate have been proposed as the bristles of toothbrushes. However, according to further studies by the present inventors, when the synthetic resin monofilament made of polytrimethylene terephthalate is used as a bristle of an oral cleaning tool such as a toothbrush, the bending bristles of the bristles and flexibility While it has the feature that the brush hair is not easily spread even when used for a long time, it has been revealed that the brush hair may be broken when used for a long time, and there is a problem in durability. Accordingly, the present invention provides a brush hair that can be used for a long period of time when used as a bristle for an oral cleaning tool such as a toothbrush or an interdental brush without impairing the bending recovery and flexibility of the polytrimethylene terephthalate. It is intended to provide an oral cleaning tool such as a toothbrush or interdental brush that does not break.

  In order to achieve the above object, the oral cleaning device according to the present invention is a monofilament made of synthetic resin in which polytrimethylene terephthalate and other polyester resin having higher rigidity than that, preferably polybutylene terephthalate, are blended as a resin component. A synthetic resin monofilament having a blending ratio of the polytrimethylene terephthalate of 40 to 60% by weight is used as a brush hair. The synthetic resin monofilament preferably has a breaking elongation of 40-80%. The elongation at break here refers to the elongation measured and calculated by the constant speed elongation type defined in JIS L 1013 “Testing method for chemical fiber filament yarn”.

The toothbrush according to the present invention is obtained by implanting the specific synthetic resin monofilament as described above into at least a part of the flock hole provided in the flocking table of the handle. Furthermore, in the present invention, in addition to the above, a toothbrush in which the diameter of the synthetic resin monofilament is 0.180 mm or less, and a hair bundle having different hair lengths are planted on the flocking table. Toothbrush made of the specific synthetic resin monofilament, toothbrush for children, toothbrush with flocking area of 1.25 cm ² or less, toothbrush with flocking hole diameter of 1.6 mm or less, flocking table width of 7.5 mm or less A toothbrush in which the number of rows of flocks is 1 or 2, a toothbrush in which at least a part of a bristle made of the specific synthetic resin monofilament is tapered, and a brush made of the specific synthetic resin monofilament The present invention provides a toothbrush in which at least a part of the bristles is pre-processed and a toothbrush having a bristle length of 8 mm or less.

  Moreover, the interdental brush which concerns on this invention uses the said specific synthetic resin monofilament as a bristle.

  The synthetic resin monofilament used in the present invention is a synthetic resin monofilament blended with polytrimethylene terephthalate as a resin component and another polyester resin having higher rigidity than that, preferably polybutylene terephthalate. The blending ratio is 40-60% by weight, and this is used as the bristles of oral cleaning tools such as toothbrushes and interdental brushes, so plaque control is achieved by the rigidity of highly rigid polyester resins such as polybutylene terephthalate. It has excellent cleanability of difficult-to-treat parts, and also has the bend recovery and flexibility of polytrimethylene terephthalate, making it difficult for brush hairs to spread even when used for a long period of time, and in particular, polybutylene terephthalate as the polyester resin. When used for long periods of time without any contact therewith even breaking used, it is possible to provide an excellent oral hygiene tool durability.

  In particular, when the breaking elongation of the synthetic resin monofilament is 40 to 80%, it is possible to provide an oral cleaning tool with superior durability when used as a brush hair of an oral cleaning tool.

  The toothbrush of the present invention is excellent in durability and cleanability because a hair bundle made of the synthetic resin monofilament as described above is implanted in at least a part of the flock hole provided in the flocking table at the tip of the handle. Yes.

  As a filament for an oral cleaning tool used as a brush hair of a toothbrush, the smaller the filament diameter, the smaller the bristle, such as the interdental part, the gingival margin part, and the pit and fissure part of the molar part. It is possible to provide an oral cleaning tool that is easy to insert a hair tip and has excellent cleanability. On the other hand, as the filament diameter is smaller, the brush hair is less durable. On the other hand, the synthetic resin monofilament used in the present invention has the rigidity that is characteristic of polyester resins such as polybutylene terephthalate, and since the hair does not spread easily and does not break, when used as a brush hair, To provide a toothbrush having excellent durability by having a diameter of 0.180 mm or less, having excellent cleaning properties, and that the brush hair is difficult to spread even when used for a long period of time, and the brush hair does not break. Can do.

  A toothbrush in which a bunch of different bristles is planted on the bristles at the end of the handle is a long bunch of bristles with a bristle tip between the teeth, gingival margins, or pits of the molars It is easy to insert into a gap or a narrow space in the inside, and is excellent in cleanability, and a smooth surface can be cleaned by the rigidity of the bristles of a short hair bundle. However, on the other hand, there is a problem in the durability of the bristle portion of the long hair bundle protruding from the short hair bundle. On the other hand, in the present invention, by using the synthetic resin monofilament used in the present invention, which is excellent in durability, as the brush hair of the long hair bundle, it is possible to plant hair bundles having different hair lengths. It is possible to provide a toothbrush having excellent cleaning properties and excellent durability.

  In addition, children often chew the brush bristles of their toothbrushes when brushing their teeth, and often brush them by pressing them against their teeth with a stronger force than necessary. Compared to adult toothbrushes, more durability is required. Therefore, by using the synthetic resin monofilament of the present invention excellent in durability as described above as a brush hair, it is possible to provide a toothbrush for children excellent in durability that the brush hair does not spread even if used by a child. Can do.

Generally, the toothbrush has better operability in the oral cavity as the flocked area is smaller. However, on the other hand, the durability of the brush hair tends to decrease as the flocked area decreases. In this respect, since the synthetic resin monofilament used in the present invention is excellent in durability, by using this as a brush bristles of a toothbrush, the flocking area is 1.25 cm ² or less and the operability in the oral cavity is good and long. It is possible to provide a toothbrush having excellent durability without spreading or breaking of the bristle even after a period of use.

  In general, the smaller the flock hole diameter is, the easier the toothbrush can insert the bristles of the bristles into gaps or narrow spaces in the oral cavity, such as the interdental part, the gingival margin part, and the pit and fissure part of the molar part. However, on the other hand, as the flocked hole diameter is smaller, the durability of the brush hair tends to decrease. In this respect, since the synthetic resin monofilament used in the present invention is excellent in durability, by using this as a brush hair of a toothbrush, the flocking hole diameter is 1.6 mm or less, and it is excellent in cleaning properties, and is used for a long time. In addition, it is possible to provide a toothbrush having excellent durability without spreading or breaking of the bristle.

  In general, the smaller the width of the flocking table, the easier the toothbrush fits to the boundary between the teeth and gums, and the better the cleaning of the gingival margin. However, on the other hand, the number of brush hairs in the width direction inevitably decreases as the width of the flocking table becomes narrower, and the durability tends to decrease. In this respect, since the synthetic resin monofilament used in the present invention is excellent in durability, by using this as a brush hair of a toothbrush, the width of the flocking table is as small as 7.5 mm or less, and the brush is formed at the boundary between teeth and gums. It is possible to provide a toothbrush that easily fits hair, is excellent in cleanability of the gingival margin, and that does not spread out even when used for a long period of time and has excellent durability without breakage.

  In general, the smaller the number of rows of flocks (hair bundles) planted on the flocking table, the more easily the toothbrush fits at the boundary between the teeth and gums and the better the cleaning of the gingival margin. However, on the other hand, durability tends to decrease as the number of rows of flocking decreases. In this respect, since the synthetic resin monofilament used in the present invention is excellent in durability, by using this as a brush hair of a toothbrush, the number of rows of flocking is as small as 1 or 2, and the brush hair at the boundary between teeth and gums. Therefore, it is possible to provide a toothbrush that is easy to fit, has excellent cleanability of the gingival margin, and has excellent durability without brush breakage even when used for a long period of time.

  In addition, as for the bristles of toothbrushes, those with a taper treatment, that is, those with a tapered portion at the tip, are provided in the oral cavity such as interdental parts, gingival marginal parts, and pits and fissures of molars. Easy to insert into gaps and narrow spaces, and excellent cleanability. However, on the other hand, the brush hair subjected to the tapering treatment is inferior in durability. In this respect, since the synthetic resin monofilament used in the present invention is excellent in durability, it is excellent in cleanability by tapering the bristles and using them as brush hairs of a toothbrush, and even if used for a long time, the brush It is possible to provide a toothbrush that is hard to spread and has excellent durability without breakage.

  Furthermore, as the brush bristles of toothbrushes, those that have undergone pre-splitting processing, i.e., those that have been split at the tip, can be obtained by splitting the thin bristle tips between the teeth, the gingival margins, the pits of the molars, etc. Easy to insert into gaps or narrow spaces in the oral cavity and excellent in cleaning properties. However, on the other hand, the tip portion of the divided bristle tends to bend or break and tends to be inferior in durability. In this respect, since the synthetic resin monofilament used in the present invention is excellent in durability, the toothbrush having excellent cleaning properties and durability can be obtained by pre-dividing the hair tip and using it as a brush hair of a toothbrush. Can be provided.

  In general, when the bristle length of the toothbrush is short, the operability in the oral cavity is improved. On the other hand, the bristle is hard, and if pressed against the gum more than necessary, the gum may be damaged. In this respect, since the synthetic resin monofilament used in the present invention is excellent in flexibility, the hair length of the brush hair is shortened to 8 mm or less to improve the operability in the oral cavity, and the brush hair is soft and the gums are improved. It is possible to provide a toothbrush that is not damaged.

  Furthermore, since the interdental brush is used by being inserted into a narrow interdental portion, the brush hair tends to spread in a short period of time. In this respect, since the synthetic resin monofilament used in the present invention is excellent in durability, the interdental brush using the synthetic resin monofilament as brush hair does not spread in a short time, and is excellent in durability. .

  In the toothbrush 10 of the present invention, for example, as shown in FIG. 1, the bristles 4 made of synthetic resin monofilaments are implanted in the flock holes 3 of the flocking table 2 formed at the tip of the handle 1. The hair transplant part 5 is comprised. In addition, the interdental brush 20 of the present invention, as shown in FIG. 2, for example, is a synthetic resin monofilament obtained by helically winding a wire 11 made of various stainless steels, nickel base alloys, cobalt base alloys, titanium / nickel alloys, and the like. A brush 13 comprising a hair bundle made of brush hair 12 sandwiched and fixed between the helically wound wires 11 embedded in a short shaft handle 14 made of synthetic resin or the like, or a brush (not shown) 13 is embedded in a short shaft base and fixed to a long shaft holder, or the tip of the long shaft holder is bent, and the brush 13 and the handle 14 are configured separately. And the like used by attaching the brush 13 to the handle 14.

  Synthetic resin monofilaments used as the bristle 4 and 12 in the toothbrush 10 and interdental brush 20 of the present invention as described above are blended with polytrimethylene terephthalate as a resin component and a polyester resin having higher rigidity. It is a monofilament made of synthetic resin, and the blending ratio of the polytrimethylene terephthalate is 40 to 60% by weight. Even if it is used for a long period of time, the brush hairs 4 and 12 are hard to spread, and there is no fear of breakage. Excellent. In particular, the durability of the brush bristles 4 and 12 is excellent when the breaking elongation of the synthetic resin monofilament is 40 to 80%. In particular, in the case of an interdental brush, since the brush 13 is inserted into a narrow interdental portion and used, the brush bristles 12 usually tend to spread in a short period, and there are many disposable types. However, since the synthetic resin monofilament used in the present invention is difficult to expand or break and is excellent in durability, the interdental brush 20 of the present invention using this as the bristles 12 is excellent in durability.

  Examples of the polyester resin having high rigidity other than the polytrimethylene terephthalate include polybutylene terephthalate, polyethylene terephthalate, and polyethylene naphthalate. Of these polyester resins, polybutylene terephthalate is particularly preferable because the filament is not easily broken.

  Polyester resins such as polybutylene terephthalate other than polytrimethylene terephthalate in the synthetic resin monofilament material used in the present invention are used as brush hairs 4 and 12 for oral cleaning tools such as toothbrush 10 and interdental brush 20. When used, it is excellent in rigidity that greatly contributes to the plaque removal force and workability of processing the filament tip into a predetermined shape in order to reach the tip of the brush hair to a site where plaque control is difficult. And, by blending polytrimethylene terephthalate with these polyester resins in the predetermined ratio, the excellent properties of polytrimethylene terephthalate can be obtained without sacrificing the rigidity and workability of the other polyester resins. Teeth such as the toothbrush 10 and the interdental brush 20 without the problem of breakage when used for a long period of time, which is a drawback of the monofilament for oral cleaning tools made of polytrimethylene terephthalate, which has both bending recovery and flexibility. The durability of the interim cleaning tool can be improved. When the proportion of the other polyester-based resin such as polybutylene terephthalate in the resin component of the synthetic resin monofilament material exceeds 60% by weight, the proportion of polytrimethylene terephthalate in the material decreases, flex recovery and flexibility When it is used as a brush hair of an oral cleaning tool such as the toothbrush 10 or the interdental brush 20, the brush hair easily spreads. On the other hand, when the other polyester-based resin in the material is less than 40% by weight, the proportion of polytrimethylene terephthalate in the material increases, and when this is used as a brush hair, the rigidity of the brush hair and the tip processability are reduced. Not only the toothbrush or the interdental brush is used for a long time, but the bristle is easily broken.

  A synthetic resin monofilament having an elongation at break of 40 to 80% is more excellent in durability. The breaking elongation can be appropriately set by removing the internal stress and stabilizing it by performing normal melt spinning, drawing, and heat treatment under tension.

  FIG. 3 shows another embodiment of the toothbrush of the present invention, in which hair bundles 4A and 4B having different hair lengths are implanted on the hair transplant table 2 at the tip of the toothbrush handle. The long hair bundle 4 </ b> A is arranged on the center side of the flocking table 2, and the short hair bundle 4 </ b> B is arranged on both sides of the flocking table 2. This toothbrush 30 is easily cleaned by inserting the bristle tips 4a of the long bristles 4A into gaps or narrow spaces in the oral cavity, such as interdental parts, gingival margins, and pits and fissures of molars. Excellent in properties. Further, by using the synthetic resin monofilament according to the present invention as the bristles of the long hair bundle 4A, a toothbrush having excellent durability can be provided. In addition, the bristle of the short hair bundle 4A may be composed of the same synthetic resin monofilament as the long hair bundle 4A, or conventionally known nylon or polybutylene terephthalate as a filament material for an oral cleaning tool. Or you may comprise from polyester, polyolefin, such as polytrimethylene terephthalate, and the monofilament which used those mixtures as a raw material.

In addition, a toothbrush having good operability in the oral cavity can be provided by reducing the flocked area to 1.25 cm ² or less. In addition, the flocked area in the said toothbrush means the area of the part which tied the outer side of the flocked hole prescribed | regulated to JISS3016 "toothbrush" with the straight line. Furthermore, the diameter of the bristles 3 is 1.6 mm or less, and the bristles of the bristles can be easily inserted into gaps or narrow spaces in the oral cavity such as interdental parts, gingival margins, and pits and fissures of molars. It is possible to provide a toothbrush that is superior in

  Further, by reducing the width of the flocking table 2 of the toothbrushes 10 and 30 (indicated by the symbol w in FIG. 3) to 7.5 mm or less, the brush hair can be easily fitted at the boundary between the teeth and gums, and the gingival margin It is possible to provide a toothbrush excellent in edge cleanability. Further, for example, the number of rows of bristle bundles 4C is 2 as in the toothbrush 40 shown in FIG. 4A, and the number of rows of bristle bundles D is as small as 1 like the toothbrush 50 shown in FIG. 4B. By doing so, it is easy to fit the bristle at the boundary between the teeth and gums, and it is possible to provide a toothbrush that is excellent in cleaning of the gingival margin.

  Furthermore, as shown in FIG. 5, the bristles 4 are tapered and a tapered portion is provided at the tip so that the bristles of the bristles 4 in the toothbrush are interdental, gingival margins, and molar pits. It can be easily inserted into a gap or a narrow place in the oral cavity such as a fissure part, and an oral cleaning tool excellent in cleanability can be obtained.

  The filament tip processing as described above can be performed by a chemical method such as dissolution with a chemical solution such as caustic soda or machining such as polishing with a disk, but is preferably performed by machining. This is because, for example, when the tip is tapered by a chemical method using a chemical solution such as caustic soda, a narrower taper portion is formed over a wide range from the filament tip, or the tip is sharply narrowed toward the filament tip. This is because the rigidity of the leading end of the filament is lowered and the plaque removing force may be lowered.

  Furthermore, the preferable diameter d of the bristle 4 in a toothbrush is in the range of 0.1-0.3 mm. As the diameter d of the filament used as the brush bristles 4 of the toothbrush is smaller, the bristles of the bristles 4 are formed in gaps or narrow spaces in the oral cavity, such as interdental parts, gingival margins, and pits and fissures of molars. Is easy to insert and excellent in cleanability, while the smaller the diameter d of the filament, the lower the durability. However, the synthetic resin monofilament used in the present invention has excellent durability even when the filament diameter d is 0.180 mm or less, and the brush bristles 4 and 11 to the portion where the diameter of the bristles 4 is thin and plaque control is difficult. A toothbrush having high reachability and excellent cleaning properties can be provided.

  The cross-sectional shape of the monofilament of the bristle 4 is not particularly limited, and various cross-sectional shapes such as a circle, an ellipse, a triangle, and a quadrangle can be employed. In the case of other than a circular cross section, the diameter d of the filament means the maximum diameter in the cross section. Moreover, the flocking pattern of the brush hair 4 in the flocking table 2 is not particularly limited, and can be flocked in an appropriate pattern. Further, as the bristle, the monofilament having the tip tapered portion 41 as described above and the monofilament having a different material and tip shape may be mixed and planted on the flocking table 2.

  Moreover, as shown in FIG. 6, you may divide the front-end | tip by performing a pre-allocation process to the bristle 4 of the toothbrush 10 or the interdental brush 20. FIG. The bristle 4 with its tip divided in this way can be easily inserted into a gap or narrow space in the oral cavity, such as the interdental portion, the gingival marginal portion, and the pit and fissured portion of the molar portion, where the thin bristle tip 41 is divided. Excellent cleanability. In the pre-splitting process, for example, a hollow filament is planted on the tuft 2 of the handle 1 and the filament tip is split with a sharp blade.

  Moreover, if the bristle length (symbol H shown in FIG. 1) of the bristle 4 is 8 mm or less, a toothbrush with good operability in the oral cavity can be provided.

(Example 1)
Each resin in which polybutylene terephthalate and polytrimethylene terephthalate were blended at a blending ratio shown in Table 1 was melt-spun to obtain a synthetic resin monofilament having a diameter of 0.18 mm. The monofilament was bent at the center to be brushed into a flocking hole of the flocking table with a length of 10 mm to form a flocked portion of the toothbrush, and the breakage and durability of the bristles were examined by the following methods.

(Brush of brush hair)
The toothbrush was immersed in warm water of 37 ° C., applied with a load of 1 kg, and reciprocated 10,000 times. The presence or absence of breakage was confirmed by microscopic observation, and evaluated according to the following criteria.
○: Several hairs are bent Δ: The hair is broken all over ×: The hair bundle is broken all over

(Durability of brush hair)
The toothbrush is immersed in warm water of 37 ° C., and the spread of the brush bristles after reciprocating 10,000 times under a load of 500 g is (A) the width of the flocked portion in the initial direction of the toothbrush minor axis (flocked) The width at the tip of the brush bristles) and (B) the width of the flocked portion in the direction of the minor axis of the toothbrush with the bristles open after 10,000 reciprocations, and the durability index calculated by the following formula (low index) The durability was evaluated according to the following criteria.
Durability index (%) = [(B) / (A)] × 100
A: 100-150%
○: 150-200%
Δ: 200-250%
×: Over 250%

  The above evaluation results are shown in Table 1.

  From Table 1, it is clear that a synthetic resin monofilament in which polybutylene terephthalate and polytrimethylene terephthalate are blended at a predetermined ratio of the present invention is difficult to spread, is not broken, and is excellent in durability as a brush hair.

  A resin obtained by blending polybutylene terephthalate and polytrimethylene terephthalate at a blending ratio of 50/50 was melt-spun to obtain various synthetic resin monofilaments having a diameter of 0.18 mm and different elongation at break (Table 2). The monofilament was bent at the center to be brushed and planted in a flocking hole of a flocking table with a length of 10 mm to form a flocked portion of the toothbrush, and the durability was examined in the same manner as in Example 1. The results are shown in Table 2.

  From Table 2, the oral cleaning device excellent in durability is provided by blending polybutylene terephthalate and polytrimethylene terephthalate at a predetermined ratio of the present invention and using a synthetic resin monofilament having a breaking elongation of 40 to 80%. Obviously you can.

It is an enlarged front view of the flocking table part which shows one Embodiment of the toothbrush of this invention. It is a front view which shows one Embodiment of the interdental brush of this invention. It is an enlarged side view of the flocking base part which shows other embodiment of the toothbrush of this invention. (A), (b) is an enlarged side view of the flocking base part which shows other embodiment of the toothbrush of this invention. It is an enlarged view of the front-end | tip part of the monofilament of the brush hair which taper-processed. It is an enlarged view of the front-end | tip part of the monofilament of the brush hair which carried out the front-end process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Toothbrush handle 2 Flocking table 3 Flocking hole 4 Brush bristles 4a Bristles 4A to 4D Hair bundles 5 Flocked part 10 Toothbrush 11 Wire 12 Brush bristles 13 Brush 14 Interdental brush handle 20 Interdental brush 40 Toothbrush 41 Split hair Tip 50 Toothbrush d Filament diameter H Hair length w Root width

Claims (15)

  A synthetic resin monofilament in which polytrimethylene terephthalate and other polyester resin having higher rigidity are blended as a resin component, and the blend ratio of the polytrimethylene terephthalate is 40 to 60% by weight. An oral cleaning tool characterized by being used as a brush hair.   The oral cleaning tool according to claim 1, wherein the other polyester-based resin is polybutylene terephthalate.   The oral cleaning tool according to claim 1 or 2, wherein the synthetic resin monofilament has a breaking elongation of 40 to 80%.   A toothbrush obtained by implanting the synthetic resin monofilament according to any one of claims 1 to 3 as a brush into at least a part of a flock hole provided in a flocking base at a tip of a handle.   The toothbrush according to claim 4, wherein the synthetic resin monofilament has a diameter of 0.180 mm or less.   A hair bundle having different hair lengths is planted on the hair transplant table as brush hairs, and the hair bundle having a long hair length is made of the synthetic resin monofilament according to any one of claims 1 to 3. The toothbrush described.   The toothbrush according to any one of claims 4 to 6, which is for children. The toothbrush in any one of Claims 4-7 whose flocked area is 1.25 cm < ² > or less.   The toothbrush in any one of Claims 4-8 whose flocking hole diameter is 1.6 mm or less.   The toothbrush according to any one of claims 4 to 9, wherein the width of the flocking table is 7.5 mm or less.   The toothbrush according to any one of claims 4 to 10, wherein the number of rows of flocking is 1 or 2.   The toothbrush in any one of Claims 4-11 which tapered-processed at least 1 part of the bristle consisting of the said synthetic resin monofilament.   The toothbrush according to any one of claims 4 to 11, wherein a tip of at least a part of brush bristles made of the synthetic resin monofilament is preliminarily processed.   The toothbrush according to any one of claims 4 to 13, wherein the bristle has a bristle length of 8 mm or less.   The interdental brush which uses the synthetic resin monofilament as described in any one of Claims 1-3 as a bristle.

Images