JP2009178938A - Shaft body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that in the case of adding a functional material to an elastic resin to make a grip part exert the effect other than a non-slip property and easiness to hold, the grip part has an increased hardness and becomes impossible to mold due to the deterioration of moldability and therefore the amount of the functional material to be added to the elastic resin is restricted, which makes it impossible to use the amount enough to exert the functions. <P>SOLUTION: In regard to this shaft body on which the grip part having a space inside by providing at least an inner layer and an outer layer is disposed and/or provided integrally, the first essential point is that the functional material is provided in the space, the second point is that the material provided in the space is a mixture of a viscous matter and the functional material and the third point is that the functional material is provided in the inner layer and/or the outer layer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a shaft body in which an elastic resin is provided on at least a grip portion of the shaft body, and examples of the shaft body include writing instruments such as ballpoint pens and mechanical pencils, elongated containers such as lipsticks and eyeliners, Tools such as fishing rods, door knobs, and drivers.

Various inventions have been made in order to provide the gripping portion with effects such as slip prevention and ease of gripping. As the anti-slip, a configuration (grip) in which an elastic resin such as silicone or elastomer is arranged in the grip portion is adopted, and a grip portion that is easy to hold is formed by changing the shape and hardness of the elastic resin. In addition, studies have been made to add a functional material to an elastic resin in order to exhibit effects other than anti-slip and ease of gripping. Examples include adding a material having a temperature maintaining function to the elastic resin so as to keep the temperature of the gripping portion constant, or adding a material that changes color depending on the temperature to give a visual effect.
JP 2003-285589 A JP 2004-188812 A JP-A-2005-14585

  However, when a functional material is added to the elastic resin, there is a problem in that the amount of the functional material that can be added to the elastic resin is limited. Generally, the amount of the functional material added to the elastic resin is about 0.1 to 10% by weight, and if it is added more than that, the elastic resin becomes hard, and the softness expected as a gripping part can be exhibited. It will disappear or moldability will deteriorate. In addition, there are many materials that are less effective as functional materials if they are not present on the outermost surface of the elastic resin, such as color change, and it is said that sufficient effects cannot be exhibited because there are few functional materials that appear on the outermost surface with a general addition amount. There is also a problem.

  In view of the above, the present invention provides a shaft body in which a grip portion having a space provided therein is provided by providing at least an inner layer and an outer layer and / or a shaft body in which the functional material is disposed in the space. The second gist is that the substance arranged in the space is a mixture of a viscous material and a functional material, and the third gist is that the functional material is arranged in the inner layer and / or the outer layer. Is.

  The material of the shaft body 1 may be any material that can form metal, resin, wood, stone, and the like. If the material forming the grip portion 2 has sufficient strength to form the shaft body 1, the grip portion is made of that material. Can be formed on the shaft body itself, and is not particularly limited. These materials may be one kind or a mixture of two or more kinds.

  Examples of the material of the shaft body 1 and / or the grip portion 2 include resin and / or elastic resin. As the resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyethylene resin (PE), polypropylene resin (PP), polystyrene resin (PS), acrylonitrile styrene resin (AS), acrylonitrile styrene butadiene resin (ABS), Methacrylic resin (PMMA), polyacetal resin (POM), polyamide resin (PA), polycarbonate resin (PC), polyethylene terephthalate resin (PET), tetrafluoroethylene resin (PTFE), acrylic resin and silicone resin as elastic resin , Fluorine resin, vinyl chloride, urethane resin, polyurethane resin, polyethylene resin, elastomer gel, polyethylene gel, dimethyl silicone, methyl vinyl silicone, methyl phenyl vinyl silicone , Methyl fluoroalkyl silicone (fluorosilicone), fluoro-dimethyl copolymer silicone, urethane rubber, ethylene acrylic rubber, epichlorohydrin rubber, acrylic rubber, ethylene propylene rubber, chloroprene rubber, natural rubber, isoprene rubber, chlorinated polyethylene, nitrile rubber , Styrene elastomers, olefin elastomers, ester elastomers, urethane elastomers and the like, but are not particularly limited as long as the shape can be maintained. These resins and / or elastic resins may be one kind or a mixture of two or more kinds. In addition, it is possible to improve the anti-slip effect and the grip feeling by molding and painting an elastic resin on the surface of the grip portion formed of resin.

  The hardness of the elastic resin constituting the gripping portion may be appropriately selected within a hardness range of 0 to 90 degrees for Shore A or 0 to 90 degrees for Asker C, and is not particularly limited. However, an elastic resin of 60 degrees or less on Shore A and 80 degrees or more on Asker C becomes hard and less sticky or swells on the surface. Therefore, it is an elastic resin of 60 degrees or less on Shore A and 80 degrees or less on Asker C. It is desirable. Moreover, the inner layer 3 and the outer layer 4 may be integrally molded with the same material, or may be separately molded with materials having different hardness, and are not particularly limited.

  The functional material 5 is disposed between the shaft body and the grip portion and / or in a space provided in the grip portion. The functional material 5 is a material that exerts an effect other than the improvement of the grip feeling on the finger or hand by being disposed in the vicinity of the grip portion and / or a material that exhibits an effect by the temperature of the finger or hand or the pressure of deformation. There are latent heat storage materials, reversible color change materials, far-infrared radiation materials and the like. A latent heat storage material is a material that can store the latent heat exchanged with the outside during the phase change and transition of the substance as thermal energy, and has the effect of keeping the temperature constant, such as ice (water), normal paraffin, inorganic salts, etc. Can be given. In order to use them efficiently, they are emulsified and encapsulated in microcapsules. There are products such as Passamo (Tamai Kasei Co., Ltd.) and Thermo Memory (Mitsubishi Paper Co., Ltd.). The reversible color-changing material is a material that can reversibly change the color tone by an external stimulus such as light, temperature, and pressure, and includes a photochromic material, a thermochromic material, a piezochromic material, and the like depending on the kind of the stimulus. In order to use them efficiently, there are those emulsified and those encapsulated in microcapsules, and there are products such as chromicolor (Matsui Dye Chemical Co., Ltd.) and temperature reaction capsules (Chemtech Co., Ltd.). The far-infrared radiation material is a material generally referred to as ceramics, and is an inorganic compound of various metal elements such as aluminum, silicon, magnesium, zirconium, and titanium and oxygen, nitrogen, carbon, boron, and the like, and a composite compound thereof. And alumina, zirconia, barium titanate, silicon carbide, silicon nitride and the like.

  The functional material 5 may be arranged as an emulsion or microcapsule between the shaft body and the gripping part and / or in the space provided in the gripping part, but the auxiliary material 6 such as a viscous material or a gel-like substance You may mix and distribute in the stabilized state. Examples of viscous materials include silicone oils such as KF96 (manufactured by Shin-Etsu Chemical Co., Ltd.), silicone oil compounds such as tsk5370 (manufactured by Ge Toshiba Silicone), and petroleum-based oils such as Retinax Grease CL (manufactured by Showa Shell Sekiyu KK). Grease. Examples of gel-like substances include silicone gels such as KE-1052, sifel 827 (manufactured by Shin-Etsu Chemical Co., Ltd.), alpha gel (manufactured by Geltech Co., Ltd.), and urethane gels such as human skin gel (manufactured by EXCIAL Corporation) Can be given. These auxiliary materials may be one kind or a mixture of two or more kinds.

  A substance having oil absorption and / or water absorption may be added to the space provided in the elastic resin and / or the grip portion. There are many types and shapes of oil-absorbing and / or water-absorbing substances, such as substances used in cosmetics, substances used for removing oil, and substances used for deodorization and cleaning in the home. is there. For example, natural materials such as wood, fiber, cork, charcoal and leather, adsorbent materials such as silica gel and activated carbon, inorganic minerals such as zeolite and diatomaceous earth, crosslinked polyacrylate, crosslinked polymethyl methacrylate, polyamide porous material Polymer oil absorbing / water absorbing agents such as spindle-shaped hollow porous silica, porous silica, porous silicone, calcium carbonate and magnesium carbonate, and porous ceramics. Further, by forming an oil-absorbing and / or water-absorbing film such as porous silica on the surface, the substance may exhibit and improve oil-absorbing and / or water-absorbing functions. Inorganic minerals and inorganic compounds are particularly preferred because it is desirable that the size of these oil-absorbing and / or water-absorbing substances does not change upon oil absorption and / or water absorption. These substances having oil absorption and / or water absorption may be one kind or a mixture of two or more kinds.

  A substance having oil absorption and / or water absorption is preferably added as fine particle powder in order to sufficiently exhibit its function. As the particle size is finer, the surface area per unit weight increases, so that the effect of increasing the absorption efficiency of oil and / or water can be expected. However, the particle size may be appropriately selected according to the shape and size of the gripping part. Further, by using inorganic powder having oil absorption and / or water absorption, there is no change in volume even when oil and / or water is absorbed, and swelling and loosening of the gripping portion can be further prevented. When added to the elastic resin, the amount added may be appropriately selected according to the shape and size of the gripping part, but if the amount added is too small, a sufficient effect cannot be expected, and if it is too large, the strength is impaired. Therefore, it is desirable that the addition amount is 0.01% to 10% by weight ratio to the resin. In the case of arranging in the space provided in the gripping part, the powder may be left as it is, but it may be mixed with the auxiliary material 7 such as a viscous material or a gel-like substance and arranged in a stabilized state.

These elastic resins have fine powders and fine particles to provide functionality such as improved touch and fingertips, improved design such as coloring and patterns, absorption and release of antibacterial and sweat, and self-cleaning by photocatalytic reactions. In addition, a foaming agent or the like may be included.
Specific examples of the powder include resin powder such as styrene, nylon, polyolefin, silicone, epoxy, polymethyl methacrylate, inorganic powder such as silica, alumina, zirconia, glass piece, metal piece, silk powder, Examples include powdered natural materials such as wood flour and cork flour. In addition, composite powders obtained by coating these powders with powder coatings such as acrylic, urethane, and epoxy resins, and resin powders using automatic mortars, ball mills, jet mills, atomizers, hybridizers, etc. Examples include those in which an inorganic powder smaller than the resin powder is adsorbed or driven into the body, and is not particularly limited. In addition, the shape of the powder may be amorphous, spherical, plate-like, or needle-like, and is not particularly limited. These powders may be added alone or in combination.

  Specific examples of the fine particles include oxides such as carbon black, graphite, titanium oxide, tin oxide, and indium oxide, nitrides such as titanium nitride, chromium nitride, zirconium nitride, and tantalum nitride, titanium carbide, zirconium carbide, Carbides such as tantalum carbide, borides such as titanium boride, zirconium boride, and tantalum boride are exemplified, and are not particularly limited. Further, the shape of the fine particles may be amorphous, scaly, spherical or fibrous. One kind or two or more kinds of these fine particles may be added.

As the foaming agent, a chemical foaming agent, a physical foaming agent, a thermally expandable microcapsule, or the like is used. Specific examples of chemical foaming agents include organic pyrolytic foaming agents such as azo compounds, nitroso compounds, hydrazine derivatives, semicarbazide compounds, azide compounds and triazole compounds, organic reactive foaming agents such as isocyanate compounds, bicarbonates and the like. Examples include inorganic pyrolytic foaming agents such as carbonates, sulfites, and hydrides, and inorganic reactive foaming agents such as sodium bicarbonate + acid, hydrogen peroxide + yeast bacteria, and zinc powder + acid.
Specific examples of the physical foaming agent include butane, pentane, hexane, dichloroethane, dichloromethane, chlorofluorocarbon, air, carbon dioxide gas, nitrogen gas, and the like.
Specific examples of thermally expandable microcapsules are thermoplastics consisting of copolymers of vinylidene chloride, acrylonitrile, acrylic esters, methacrylic esters, etc., with low-boiling hydrocarbons such as isobutane, pentane, petroleum ether, and hexane as the core material. A microcapsule using a resin as a wall material can be used and is not particularly limited. You may add these foaming agents 1 type, or 2 or more types.

  Moreover, the surface of the elastic resin which comprises the holding part 2 can be shape | molded in a smooth surface or a rough surface. For example, to increase the frictional resistance and improve the fingertip's catching, the surface should be smooth like a mirror surface, and to reduce the frictional resistance and get a tactile feel, the surface may be roughened. When the surface is roughened, the effect of making it difficult to adhere dust and dust can be obtained.

  Furthermore, moderate irregularities such as a knurled shape or a wave shape may be formed on the surface of the elastic resin constituting the grip portion 2. The smooth feeling can be obtained, and the catching property to the fingertip is also good.

  As a manufacturing method of the grip part 2, a method of attaching an elastic resin formed by a method such as compression molding, transfer molding, injection molding, extrusion molding or vacuum casting to a shaft body, or a method of forming by insert molding may be mentioned. However, the manufacturing method is not particularly limited.

  You may arrange | position the fine solid 7 between the shaft body and the holding part and / or the space provided in the holding part. Specific examples of the fine solid 7 include hard balls such as stainless steel, white, zirconia, and ruby balls, ores such as diamond, ruby, sapphire, agate, crystal, rocks such as granite and marble, polyethylene, polyethylene terephthalate , Vinyl chloride, ABS, AS, PMMA, polypropylene, polycarbonate and other resins and their foams, acrylic resin, silicone resin, fluororesin, urethane resin, polyurethane resin, dimethyl silicone, methyl vinyl silicone, methyl phenyl vinyl silicone , Methyl fluoroalkyl silicone (fluorosilicone), fluoro-dimethyl copolymer silicone, urethane rubber, ethylene acrylic rubber, epichlorohydrin rubber, acrylic rubber, ethylene propylene rubber, chloroprene rubber, natural rubber , Isoprene rubber, chlorinated polyethylene, nitrile rubber, styrene elastomer, olefin elastomer, ester elastomer, urethane elastomer and other elastic resins, nylon, silk, cotton and other fibers, glass, etc. There is no particular limitation as long as it can be formed. These fine solids may be one kind or a mixture of two or more kinds.

  The present invention provides a function to the gripping part by arranging a functional material between the shaft body and the gripping part and / or a space provided in the gripping part. There has been an example of adding a functional material to the elastic resin that forms the gripping part so far. However, the hardness of the gripping part and the amount of functional material added to the elastic resin from the aspect of moldability are limited, so the function is sufficient Could not be used. By providing a space inside the gripping part and arranging the functional material here, the effect of the functional material can be fully exerted, and it is stable when mixed with auxiliary materials such as viscous materials and gel materials It can be made a soft gripping part by arranging it in a state of being made into a state.

  The main feature of the present invention is that the functional material is disposed between the shaft body and the grip portion and / or in a space provided in the grip portion. By ingeniously arranging the gripping part and the functional material, it is possible to use an amount sufficient to demonstrate the effect of the functional material. If the functional material is a latent heat storage material, the temperature of the gripping part is kept constant. If it is a reversible color-changing material, the color change of the grip portion can be easily understood. Moreover, when a far-infrared emitting material such as ceramics that emits far-infrared rays when heat is applied is used, a grasping portion that sufficiently exhibits the effect of a functional material such as a heat retaining effect of the grasped fingertip is realized.

  FIG. 1 is a diagram of Example 1 in which the present invention is used for a grip portion of a writing instrument. 2 is a cross-sectional view taken along the line A-A 'of FIG. A space was provided inside by providing an inner layer and an outer layer, and a functional material was disposed in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, and reference numeral 5 is a functional material.

  The shaft cylinder 1 was formed by injection molding using polypropylene and an elastomer (Actimer AE-2060S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 60 °) as the grip portion 2. A grip portion 2 in which a powder latent heat storage material (Thermo Memory FP-25, manufactured by Mitsubishi Paper Industries Co., Ltd.) as a functional material 5 is arranged in a space between an inner layer and an outer layer is attached to the shaft body 1. The thermo memory FP-25 undergoes a phase transition around 25 ° C, so when grasping the grasping part, the temperature change of the grasping part, which rises with body temperature with use time, becomes moderate around 25 ° C, and even if it is used for a long time The temperature of the grip does not rise and it is difficult to sweat the fingertips.

  FIG. 3 is a diagram of Example 2 in which the present invention is used for a grip portion of a writing instrument. 4 is a cross-sectional view taken along line A-A 'of FIG. A space was provided inside by providing an inner layer and an outer layer, and a functional material was disposed in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, reference numeral 5 is a functional material, and reference numeral 6 is an auxiliary material.

  The shaft cylinder 1 was formed by injection molding using polypropylene and an elastomer (Actimer AE-2060S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 60 °) as the grip portion 2. As a functional material, powder latent heat storage material (Thermo Memory FP-25, manufactured by Mitsubishi Paper Industries Co., Ltd.) is mixed with an auxiliary material silicone gel (KE-1052, manufactured by Shin-Etsu Chemical Co., Ltd.) by 50% by weight. In this state, the grip portion 2 disposed in the space between the inner layer and the outer layer was attached to the shaft body 1. The thermo memory FP-25 undergoes a phase transition around 25 ° C, so when grasping the grasping part, the temperature change of the grasping part, which rises with body temperature with use time, becomes moderate around 25 ° C, and even if it is used for a long time The temperature of the grip does not rise and it is difficult to sweat the fingertips. Moreover, a grip part becomes soft by mixing with silicone gel, and a grip feeling is also improved.

  FIG. 3 is a diagram of Example 3 in which the present invention is used for a grip portion of a writing instrument. 4 is a cross-sectional view taken along line A-A 'of FIG. A space was provided inside by providing an inner layer and an outer layer, and a functional material was disposed in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, reference numeral 5 is a functional material, and reference numeral 6 is an auxiliary material.

  The shaft cylinder 1 was formed by injection molding using polypropylene and an elastomer (Actimer AE-2060S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 60 °) as the grip portion 2. As a functional material, a powder thermochromic material, chromicolor (Matsui Dye Chemical Co., Ltd.) is mixed with an auxiliary silicone gel (KE-1052, manufactured by Shin-Etsu Chemical Co., Ltd.) in a weight ratio of 50%. Then, the grip portion 2 disposed in the space between the inner layer and the outer layer was attached to the shaft body 1. Since the color of chromi color changes around 25 ° C, when the gripping part is gripped, the temperature of the gripping part rises with time of use and rises to 25 ° C or more. You can also. Moreover, a grip part becomes soft by mixing with silicone gel, and a grip feeling is also improved.

  FIG. 3 is a diagram of Example 4 in which the present invention is used for a grip portion of a writing instrument. 4 is a cross-sectional view taken along line A-A 'of FIG. A space was provided inside by providing an inner layer and an outer layer, and a functional material was disposed in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, reference numeral 5 is a functional material, and reference numeral 6 is an auxiliary material.

  The shaft cylinder 1 was formed by injection molding using polypropylene and an elastomer (Actimer AE-2060S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 60 °) as the grip portion 2. As a functional material, a powdered far-infrared radiation material, barium titanate (Kyoritsu Material Co., Ltd.) is mixed with an auxiliary silicone gel (KE-1052, manufactured by Shin-Etsu Chemical Co., Ltd.) in a weight ratio of 50%. Then, the grip portion 2 disposed in the space between the inner layer and the outer layer was attached to the shaft body 1. Since barium titanate is a ceramic with high far-infrared radiation, when the gripping part is gripped, the temperature of the gripping part increases with the use time, and the fingertip and hand can be warmed. Moreover, a grip part becomes soft by mixing with silicone gel, and a grip feeling is also improved.

FIG. 5 is a diagram of Examples 5 to 7 in which the present invention is used for a grip portion of a writing instrument. 6 is a cross-sectional view taken along line AA ′ of FIG.
A space was provided inside by providing an inner layer and an outer layer, and a functional material was disposed in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, reference numeral 5 is a functional material, reference numeral 6 is an auxiliary material, and reference numeral 7 is a fine solid. .

  The shaft cylinder 1 was formed by injection molding using acrylonitrile styrene butadiene and an elastomer (Lavalon MJ6301C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees) as the grip portion 2. As a functional material, a powder latent heat storage material (Passamo, P-20, manufactured by Tamai Kasei Co., Ltd.) was mixed with an auxiliary silicone gel (SYLGARD 527, manufactured by Toray Dow Corning Co., Ltd.) by 50% by weight. In the state, the grip portion 2 disposed in the space between the inner layer and the outer layer was attached to the shaft body 1. Further, glass beads (Unibeads UB-1719LN, manufactured by Union Co., Ltd., diameter 0.7 mm) were arranged as fine solid 7 in the space between the inner layer and the outer layer. Passmo and P-20 cause a phase transition at around 20 ° C, so when grasping the grasping part, the temperature change of the grasping part, which increases with the body temperature with use time, becomes moderate around 20 ° C, and even when used for a long time The temperature of the grip does not rise and it is difficult to sweat the fingertips. Moreover, a grip part becomes soft by mixing with silicone gel, and a grip feeling is also improved. The inner glass beads themselves are hard and elastic due to the silicone gel, so that they do not deform too much when grasped firmly, and a good feeling with a waist is obtained.

  Next, Example 6 will be described. As in Example 5, a space was provided by providing an inner layer and an outer layer, and a functional material was disposed in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, reference numeral 5 is a functional material, reference numeral 6 is an auxiliary material, and reference numeral 7 is a fine solid. .

  The shaft cylinder 1 is an acrylonitrile styrene butadiene, and the gripping part 2 is an elastomer (Lavalon MJ6301C, Mitsubishi) containing 10% by weight of a powder latent heat storage material (Passamo, P-20, manufactured by Tamai Kasei Co., Ltd.) as a functional material. It was molded by injection molding using a chemical Co., Ltd. product, Shore A hardness: 60 degrees. As a functional material, a powder latent heat storage material (Passamo, P-20, manufactured by Tamai Kasei Co., Ltd.) was mixed with an auxiliary silicone gel (SYLGARD 527, manufactured by Toray Dow Corning Co., Ltd.) by 50% by weight. In the state, the grip portion 2 disposed in the space between the inner layer and the outer layer was attached to the shaft body 1. Further, glass beads (Unibeads UB-1719LN, manufactured by Union Co., Ltd., diameter 0.7 mm) were arranged as fine solid 7 in the space between the inner layer and the outer layer. Passmo and P-20 cause a phase transition at around 20 ° C, so when grasping the grasping part, the temperature change of the grasping part, which increases with the body temperature with use time, becomes moderate around 20 ° C, and even when used for a long time The temperature of the grip does not rise and it is difficult to sweat the fingertips. Further, since the thermostat is also provided in the inner layer and the outer layer, the temperature maintenance effect is slightly improved as compared with the fifth embodiment. Moreover, a grip part becomes soft by mixing with silicone gel, and a grip feeling is also improved. The inner glass beads themselves are hard and elastic due to the silicone gel, so that they do not deform too much when grasped firmly, and a good feeling with a waist is obtained.

  Next, Example 7 will be described. As in Example 5, a space was provided by providing an inner layer and an outer layer, and a functional material was disposed in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, reference numeral 5 is a functional material, reference numeral 6 is an auxiliary material, and reference numeral 7 is a fine solid. .

  The shaft cylinder 1 is acrylonitrile styrene butadiene, the gripping part 2 is a powdered far-infrared radiation material as a functional material, and an elastomer (Lavalon MJ6301C, Mitsubishi Chemical (10% by weight) added with barium titanate (Kyoritsu Material Co., Ltd.). The product was manufactured by injection molding using Shore A hardness: 60 degrees). As a functional material, powder thermochromic material chromicolor (Matsui Dye Chemical Co., Ltd.) is mixed with an auxiliary silicone gel (SYLGARD 527, manufactured by Toray Dow Corning Co., Ltd.) in a weight ratio of 50%. A grip portion 2 disposed in a space between the inner layer and the outer layer was attached to the shaft body 1. Further, glass beads (Unibeads UB-1719LN, manufactured by Union Co., Ltd., diameter 0.7 mm) were arranged as fine solid 7 in the space between the inner layer and the outer layer. Since the color of chromi color changes around 25 ° C, when the gripping part is gripped, the temperature of the gripping part rises with time of use and rises to 25 ° C or more. You can also. Furthermore, since barium titanate disposed in the inner layer and the outer layer is a ceramic with high far-infrared radiation, when the gripping portion is gripped, the temperature rise of the gripping portion is accelerated, and the color change of the chromi color starts earlier. Moreover, a grip part becomes soft by mixing with silicone gel, and a grip feeling is also improved. The inner glass beads themselves are hard and elastic due to the silicone gel, so that they do not deform too much when grasped firmly, and a good feeling with a waist is obtained.

  As Comparative Example 1, a powder in which a powder latent heat storage material was not mixed with Example 2 was prepared. When grasping the grasping part, the temperature of the grasping part was increased by the body temperature with the use time, and the fingertip was sweated after being used for a short time.

  As Comparative Example 2, a spaceless gripping part of Example 1 was prepared, and powdered as a functional material having a weight ratio of 10% to an elastomer (Actimer AE-2060S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 60 °). Body latent heat storage material (Thermo Memory FP-25, manufactured by Mitsubishi Paper Industries Co., Ltd.) was added. Thermo-memory FP-25 undergoes a phase transition around 25 ° C, so when grasping the grasping part, the temperature change of the grasping part that increases with body temperature with use time becomes gentle around 25 ° C, but the amount added is small. The effect did not last, the temperature of the grip part increased with the time of use, and the fingertips sweated after a short period of use.

  As an evaluation of the temperature change, Example 2, Comparative Example 1 and Comparative Example 2 were allowed to stand at a constant temperature of 18 ° C. for 60 minutes and then moved to an environment of 32 ° C., and the temperature change of the gripping part surface was measured with an infrared radiation thermometer ( SK-8900, Sato Meters Co., Ltd.). The results are shown in the graph of FIG.

  As a result of the evaluation, the gripping part of Comparative Example 1 without the latent heat storage material has a rapid temperature rise, reaches 30 ° C. in about 20 minutes, and the gripping part obtained by adding the latent heat storage material to the elastic resin of Comparative Example 2 is the comparative example. Although it was slower than 1, it reached 30 ° C. in about 25 minutes. On the other hand, the temperature of the gripping part surface of Example 2 gradually increased around 25 ° C., and it took about 40 minutes to reach 30 ° C. This is because the latent heat storage material placed inside the gripping part requires thermal energy when it transitions from a solid to a liquid at around 25 ° C., and this is because the temperature rise of the gripping part is suppressed. Yes, compared to Comparative Example 2 added to the elastic resin, the temperature holding effect of Example 2 in which more latent heat storage materials are arranged is higher.

  The present invention relates to a shaft body in which an elastic resin is provided on at least a gripping portion of a shaft tube. Examples of shafts include writing instruments such as mechanical pencils, ballpoint pens, correction pens, tools such as cutters and engraving swords, drivers, input pens used in PDAs (personal digital assistance) and electronic notebooks, bicycle handles, etc. Wide range.

It is a component figure of Example 1 which used this invention for the holding part of the writing instrument. It is AA 'sectional drawing of FIG. It is component drawing of Example 2 which used this invention for the holding part of the writing instrument. It is AA 'sectional drawing of FIG. It is component drawing of Example 2 which used this invention for the holding part of the writing instrument. It is AA 'sectional drawing of FIG. It is a result of grip part temperature measurement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft 2 Gripping part 3 Inner layer 4 Outer layer 5 Functional material 6 Auxiliary material 7 Fine solid

Claims (4)

A shaft body in which a grip portion having a space provided therein is disposed and / or integrally provided by providing at least an inner layer and an outer layer, and a functional material is disposed in the space. The shaft body according to claim 1, wherein the substance disposed in the space is a mixture of a viscous material and / or a gel-like substance and a functional material. The shaft body according to claim 1, wherein a functional material is disposed in the inner layer and / or the outer layer. The shaft body according to any one of claims 1 to 3, wherein the functional material is a latent heat storage material.

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