JP2018199228A - Writing Instrument Set - Google Patents

Abstract

To provide a compact writing instrument set which provides a sense of unity in design when placed adjacent to each other, provides a user with a motivation to purchase a set of plural writing instruments, especially motivation to purchase in pairs.SOLUTION: A writing instrument set composed of a plurality of writing instruments has a series of designs on each barrel of the plurality of writing instruments when arranged adjacent to each other in the same orientation. The external form of each of the plurality of writing instruments may be the same. The same design is given to each barrel of the plurality of writing instruments, and the designs applied to each of the plurality of writing instruments may be applied while being shifted with a predetermined interval around the central axis so that the entire design can be visually recognized as a series when the plurality of writing instruments are arranged adjacent to each other in the same orientation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing instrument set sold in a state where a plurality of writing instruments, particularly two or more writing instruments are paired.

  In recent years, the variety of writing instruments has diversified, and writing instruments with elaborate designs and famous characters have appeared, and there are writing instruments that place importance on fashionability and collection while maintaining the performance as a writing instrument. Such writing tools that place importance on fashionability and collection, give users the pleasure of owning and boasting to others, the joy of owning a pair with their best friends and lovers, or the joy of collecting all the famous character series. give. For this reason, writing instruments that place emphasis on fashionability and collection are often purchased in pairs or purchased in multiples due to differences in characters or colors.

  For example, Patent Document 1 discloses a writing instrument set composed of a plurality of writing instruments, and each of the plurality of writing instruments forming the writing instrument set is mounted with an ornament that becomes an integrated design when adjacently arranged. A writing instrument set is disclosed in which the writing instruments that are mounted are arranged so as to form a design in which the decorative tools are integrated.

JP 2017-13502 A

  In the writing instrument set of Patent Document 1, since a separate accessory is attached to a clip or the like, it becomes bulky by the amount of the accessory. In addition, since it is necessary for the decorative tool not to obstruct the gripping or writing operation such as a clip or a knock bar, the places where the decorative tool can be mounted are limited.

  The present invention provides a compact writing instrument set that has a sense of unity when placed adjacent to each other, and has a desire to purchase a plurality of writing instruments as a set, particularly a desire to purchase a pair of writing instruments. With the goal.

  According to an aspect of the present invention, there is provided a writing instrument set including a plurality of writing instruments, wherein each of the plurality of writing instruments has a design that is integrated into a series when adjacently arranged in the same orientation. A writing instrument set is provided.

  Moreover, according to another aspect, the external shape of each of the plurality of writing instruments is the same.

  According to another aspect, the same design is applied to each of the shafts of the plurality of writing tools, and when the plurality of writing tools are arranged adjacent to each other in the same orientation, the entire design can be visually recognized as a single unit. In addition, the design applied to each of the plurality of writing instruments is applied with a predetermined interval around the central axis.

  According to another aspect, at least one of the plurality of writing tools is a thermochromic writing tool.

  Further, according to another durability, each of the plurality of writing tools has a clip, and each of the plurality of writing tools is arranged adjacent to each other in the same orientation by holding the support member with the clip.

  According to the aspect of the present invention, there is a sense of unity when arranged adjacent to each other, and the user is motivated to purchase a plurality of writing instruments as a set, in particular, the desire to purchase in pairs, and is compact. Has a common effect.

It is a front view of the writing instrument set by embodiment of this invention. It is a longitudinal cross-sectional view of a writing instrument. It is an expanded view of the film transcribe | transferred to the axial cylinder of a writing instrument. It is a perspective view of the writing instrument set accommodated in the writing instrument case. It is a photographic image of the writing instrument set accommodated in the writing instrument case.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are denoted by common reference symbols throughout the drawings.

  FIG. 1 is a front view of a writing instrument set 1 according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the writing instrument 2.

  In the present embodiment, the writing instrument set 1 has four writing instruments 2. Each of these four writing instruments 2 has the same external shape. Each of the writing instruments 2 includes a cylindrical tube 3 formed in a cylindrical shape, a clip 4 provided on a side surface of the cylindrical tube 3, an operation unit 5 provided at a rear end portion of the axial tube 3, And a refill 6 which is a writing body provided with a writing portion 6a at one end, and a spring 7 which is an elastic member for urging the refill 6 rearward.

  In the present specification, in the axial direction of the writing instrument 2, the writing part 6a side is defined as the “front” side, and the opposite side of the writing part 6a is defined as the “rear” side. Unless otherwise specified, the central axis refers to the central axis of the writing instrument 2.

  In the writing instrument 2, the refill 6 moves in the longitudinal direction in the shaft tube 3 by a knocking operation that presses the operating portion 5 forward against the urging force of the spring 7. At this time, a state in which the writing unit 6a protrudes from the shaft tube 3 is referred to as a writing state, and a state in which the writing unit 6a is immersed in the shaft tube 3 is referred to as a non-writing state. Therefore, the writing instrument 2 is a so-called knock-type writing instrument.

  FIG. 3 is a development view of the film 10 transferred to the shaft tube 3 of the writing instrument 2. A rectangular film 10 with the design 20 is transferred to the surface of each of the shaft cylinders 3 of the four writing instruments 2. The design 20 is a thick straight line extending from the lower left to the upper right in FIG. 3 in a planar state before the transfer of the film 10. When this is transferred to the surface of the shaft 3 of the writing instrument 2, the design 20 becomes a spiral line around the central axis (not shown). In addition, as a means for attaching the design to the writing instrument 2, it is not a method of transferring the film 10, but may be painting or engraving. However, by using a transfer film that is imaged by an inkjet method that does not have a white solid layer. Thus, the writing instrument 2 having excellent decorativeness and high novelty effect can be obtained.

  Here, the design means a character, a symbol, a picture, a shape (including a three-dimensional shape), a pattern or a color, or a combination thereof.

  In the present embodiment, the arrangement of the same film 10 having the same design 20 for each of the four writing instruments 2 is divided by a predetermined interval around the central axis, that is, 360 degrees is divided by 4 because there are four writing instruments 2. Transfer by 90 degrees. Thus, when the four writing instruments 2 to which the film 10 has been transferred are arranged in the same orientation, for example, the clips 4 are arranged adjacent to each other in the same direction as shown in FIG. 1, each part of the design 20 transferred to the writing instrument 2. As a result, the entire writing instrument set 1 can be visually recognized as the original design 20, that is, the design 20 in a state where the film 10 is unfolded (FIG. 3) before transfer. Further, even with the writing instrument 2 alone, the entire design 20 can be visually recognized by rotating the shaft tube 3.

  FIG. 4 is a perspective view of the writing instrument set 1 accommodated in the writing instrument case 30. The writing instrument case 30 is a box-shaped case in which at least the front surface 31 is transparent so that the series of integrated designs 20 can be visually recognized. By holding each clip 4 of the writing instrument 2 against the front edge 32, that is, the support member, the writing instrument 2 is prevented from falling off from the writing instrument case 30, and each of the writing instruments 2 is arranged adjacently in the same orientation. Can be made. As a result, in the writing instrument set 1, the entire design 20 can be visually recognized as a series. Note that the writing instrument case may have a rectangular bag shape such as an envelope instead of a box shape as long as a part of the writing instrument case is made transparent so that the design 20 can be visually recognized.

  Materials used for the writing instrument case 30 are PP, PE, PET, PEN, nylon (including non-standard nylon such as nylon 6 and nylon 12), acrylic, polymethylpentene, polystyrene, ABS, etc. It is desirable that the material is made of a resin material or glass material, and is made of a material having a visible light transmittance of 50% or more, more preferably 80% or more. The visible light transmittance can be obtained by measuring the reflectance using a multi-light source colorimeter. Further, by including a benzotriazole compound, a benzophenone compound, a salicylate compound, or the like as an ultraviolet absorber, discoloration or fading of the printed design 20 can be prevented.

  FIG. 5 is a photographic image of the writing instrument set 1 housed in the writing instrument case 30. In FIG. 5, the writing instrument set 1 has five writing instruments 2. The fish design 20 is visible as a series of the writing instrument set 1 as a whole. Since each of the writing instruments 2 is drawn with a part of the fish of the design 20, the design of the writing instrument 2 alone is not completed.

  According to the writing instrument set 1, there is a sense of unity in design when a plurality of writing instruments 2 are arranged adjacent to each other, and the user is motivated to purchase a plurality of writing instruments 2 as a set, in particular, the effect of generating a desire to purchase a pair. Play. Furthermore, according to the writing instrument set 1, unlike the writing instrument set described in Patent Document 1, it is not necessary to attach an additional decorative tool to a part of the writing instrument, so that a more compact writing instrument set can be realized. it can. Therefore, storage in the writing instrument case is facilitated.

  In the embodiment described above, the plurality of writing tools 2 constituting the writing instrument set 1 have the same outer shape, but as long as adjacent arrangements are possible, the outer shape of the part constituting the series integrated design is at least It is sufficient if they are identical. In addition, since the writing instrument set 1 constitutes the design 20 as a series, it is preferable that the writing instrument set 1 is composed of four writing instruments 2 so that the design 20 is divided into four equal parts, but two or three writing instruments 2 or five. You may make it comprise from the above writing instruments 2. FIG. In that case, according to the number of the writing tools 2 which comprise the writing instrument set 1, the design 20 attached | subjected to each writing instrument 2 is shifted and arrange | positioned around a center axis line.

  In the above-described embodiment, each of the plurality of writing instruments 2 is provided with the same design 20 while shifting the arrangement so that the entire design 20 can be visually recognized in the entire writing instrument set. Different designs may be provided to complete it alone. For example, in a writing instrument set with two writing instruments, a boy's picture is placed on the barrel of one writing instrument, a girl's picture is placed on the barrel of the other writing instrument, and these are arranged. You may make it the design which is lined up well. Moreover, you may make it become one's name by arrange | positioning 1 alphabetical character to each of the some writing instrument 2, and arrange | positioning these adjacently.

  The plurality of writing tools 2 may be the same type of writing tools having different colors and discoloration temperatures, or may be different types of writing tools from each other or only partially. As a kind of writing instrument, for example, a monochromatic ballpoint pen, a knock-type ballpoint pen, a multi-function (multicolor) ballpoint pen, a refill holder to which a large number of refills can be attached, a mechanical pencil, and the like may be used. Moreover, you may provide the erasing member which can erase the handwriting of the writing instrument 2 in a part of writing instrument 2, for example, the clip 4 and the rear-end part of the axial cylinder 3. FIG. The erasing member may be separated from the writing instrument 2 and accommodated in the writing instrument case 30.

  The refill 6 in the embodiment described above may contain a thermochromic ink containing a thermochromic color material. In this case, the writing instrument 2 is a thermochromic writing instrument, and the handwriting of the writing instrument 2 can be discolored by frictional heat generated when it is rubbed by a friction body as an erasing member.

  Here, the thermochromic ink means that when a predetermined color (first color) is maintained at room temperature (for example, 25 ° C.) and the temperature is raised to a predetermined temperature (for example, 40 to 80 ° C.), another color (second color). ), And then cooled to a predetermined temperature (for example, −40 to 0 ° C.), the ink has a property of returning to the original color (first color) again. In the writing instrument 2 using the thermochromic ink, the second color is made colorless, and the stroke drawn with the first color (for example, red) is heated to make it colorless, which is herein referred to as “erasing”. . Accordingly, the frictional body rubs against the writing surface on which the drawn line is written to generate frictional heat, thereby changing the drawn line to colorless, that is, erasing it. Of course, the second color may be a color other than colorless.

  As the thermochromic microcapsule pigment that becomes a thermochromic color material, those that change color due to heat such as frictional heat, for example, those that have a function from colored to colorless, colored to colored, colorless to colored, etc. There are no particular limitations, and various types can be used. Examples include microencapsulated thermochromic compositions containing at least a leuco dye, a developer, and a color change temperature adjusting agent.

  The leuco dye that can be used is not particularly limited as long as it is an electron donating dye and functions as a color former. Specifically, from the viewpoint of obtaining an ink having excellent color development characteristics, conventionally known ones such as triphenylmethane, spiropyran, fluoran, diphenylmethane, rhodamine lactam, indolylphthalide, leucooramine, It can be used alone (one kind) or in a mixture of two or more kinds (hereinafter simply referred to as “at least one kind”).

  Specifically, 6- (dimethylamino) -3,3-bis [4- (dimethylamino) phenyl] -1 (3H) -isobenzofuranone, 3,3-bis (p-dimethylaminophenyl) -6 -Dimethylaminophthalide, 3- (4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) phthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (1 -Ethyl-2-methylindol-3-yl) -4-azaphthalide, 1,3-dimethyl-6-diethylaminofluorane, 2-chloro-3-methyl-6-dimethylaminofluorane, 3-dibutylamino-6 -Methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-xylidinofluor Lan, 2- (2-chloroanilino) -6-dibutylaminofluorane, 3,6-dimethoxyfluorane, 3,6-di-n-butoxyfluorane, 1,2-benz-6-diethylaminofluorane, 1 , 2-Benz-6-dibutylaminofluorane, 1,2-Benz-6-ethylisoamylaminofluorane, 2-methyl-6- (Np-tolyl-N-ethylamino) fluorane, 2- (N -Phenyl-N-methylamino) -6- (Np-tolyl-N-ethylamino) fluorane, 2- (3'-trifluoromethylanilino) -6-diethylaminofluorane, 3-chloro-6 -Cyclohexylaminofluorane, 2-methyl-6-cyclohexylaminofluorane, 3-di (n-butyl) amino-6-methoxy-7-anilinofluorane 3,6-bis (diphenylamino) fluorane, methyl-3 ′, 6′-bisdiphenylaminofluorane, chloro-3 ′, 6′-bisdiphenylaminofluorane, 3-methoxy-4-dodecoxystyrino Quinoline, etc.

  These leuco dyes have a lactone skeleton, a pyridine skeleton, a quinazoline skeleton, a bisquinazoline skeleton, etc., and develop color when these skeletons (rings) are opened.

  The developer that can be used is a component having the ability to develop the leuco dye, such as a phenol resin compound, a salicylic acid metal chloride, a salicylic acid resin metal salt compound, a solid acid compound, etc. Is mentioned.

  Specifically, o-cresol, tertiary butyl catechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, hexafluorobisphenol, p N-butyl hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcin, dodecyl gallate, 2,2-bis (4′-hydroxyphenyl) propane, 4,4-dihydroxydiphenyl sulfone, 1,1-bis (4′-hydroxyphenyl) ethane, 2,2-bis (4′-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide, 1-phenyl-1,1-bis (4′-hydroxy Phenyl) ethane, 1,1-bis ( 4′-hydroxyphenyl) -3-methylbutane, 1,1-bis (4′-hydroxyphenyl) -2-methylpropane, 1,1-bis (4′-hydroxyphenyl) n-hexane, 1,1-bis (4′-hydroxyphenyl) n-heptane, 1,1-bis (4′-hydroxyphenyl) n-octane, 1,1-bis (4′-hydroxyphenyl) n-nonane, 1,1-bis (4 '-Hydroxyphenyl) n-decane, 1,1-bis (4'-hydroxyphenyl) n-dodecane, 2,2-bis (4'-hydroxyphenyl) butane, 2,2-bis (4'-hydroxyphenyl) ) Ethyl propionate, 2,2-bis (4′-hydroxyphenyl) -4-methylpentane, 2,2-bis (4′-hydroxyphenyl) hexafluoropropane, 2 2- bis (4'-hydroxyphenyl) n- heptane, 2,2-bis least one such (4'-hydroxyphenyl) n- nonane and the like.

  The amount of the developer to be used may be arbitrarily selected according to the desired color density and is not particularly limited, but is usually 0.1 to 1 part by mass of the leuco dye described above. It is preferable to select within a range of about 100 parts by mass.

  The color change temperature adjusting agent that can be used is a substance that controls the color change temperature in the coloration of the leuco dye and the developer. Conventionally known color change temperature adjusting agents can be used. Specific examples include alcohols, esters, ketones, ethers, acid amides, azomethines, fatty acids, hydrocarbons and the like.

More specifically, bis (4-hydroxyphenyl) phenylmethane dicaprylate (C ₇ H ₁₅ ), bis (4-hydroxyphenyl) phenylmethane dilaurate (C ₁₁ H ₂₃ ), bis (4-hydroxyphenyl) phenyl Methane dimyristate (C ₁₃ H ₂₇ ), bis (4-hydroxyphenyl) phenylethane dimyristate (C ₁₃ H ₂₇ ), bis (4-hydroxyphenyl) phenylmethane dipalmitate (C ₁₅ H ₃₀ ), bis There may be mentioned at least one of (4-hydroxyphenyl) phenylmethane dibehenate (C ₂₁ H ₄₃ ), bis (4-hydroxyphenyl) phenylethylhexylidene dimyristate (C ₁₃ H ₂₇ ) and the like.

  The amount of the color-change temperature adjusting agent used may be appropriately selected according to the desired hysteresis width and color density at the time of color development, and is not particularly limited, but is usually based on 1 part by mass of the leuco dye. It is preferable to use within the range of about 1 to 100 parts by mass.

  The thermochromic microcapsule pigment is obtained by microencapsulating a thermochromic composition containing at least the leuco dye, the developer, and the color change temperature adjusting agent so that the average particle diameter is 0.2 to 3 μm. Can be manufactured. Examples of the microencapsulation method include interfacial polymerization method, interfacial polycondensation method, in situ polymerization method, liquid curing coating method, phase separation method from aqueous solution, phase separation method from organic solvent, melt dispersion cooling method, air A suspension coating method, a spray drying method, etc. can be mentioned, and can be appropriately selected according to the application.

  For example, in a phase separation method from an aqueous solution, a leuco dye, a developer, and a color change temperature adjusting agent are heated and melted, then charged into an emulsifier solution, heated and stirred to disperse into oil droplets, and then as a capsule film agent, Use resin raw materials, for example, gradually add amino resin solution, isocyanate resin solution, etc., and continue to react to prepare, then filter this dispersion to produce the desired thermochromic microcapsule pigment be able to.

  The content of these leuco dyes, developer, and color change temperature adjusting agent varies depending on the type of leuco dye, developer, color change temperature adjusting agent used, microencapsulation method, etc. The developer is 0.1 to 100 developer and 1 to 100 color changing temperature adjusting agent in mass ratio. Moreover, a capsule membrane agent is 0.1-1 by mass ratio with respect to the capsule content.

  The thermochromic microcapsule pigment is a combination of the above-described leuco dye, color developer, and color change temperature adjusting agent, and the amount, color development temperature of each color (for example, color development at 0 ° C. or higher), decolorization temperature ( For example, it is possible to set the color erasing at 50 ° C. or higher) to a suitable temperature, and it is preferable that the color changes from colored to colorless by heat such as frictional heat.

  In the thermochromic microcapsule pigment, the wall film is preferably formed of a urethane resin, a urea / urethane resin, an epoxy resin, or an amino resin from the viewpoint of further improving the drawing density, storage stability, and writing property. As a urethane resin, the compound of isocyanate and a polyol is mentioned, for example. As an epoxy resin, the compound of an epoxy resin and an amine is mentioned, for example. Examples of amino resins include melamine resins, urea resins, and benzoguanamine resins. The thickness of the wall film of the microcapsule coloring material is appropriately determined according to the required strength of the wall film and the drawn line density.

  The average particle size of the thermochromic microcapsule pigment is low in color, color developability, easy decoloring, stability, fluidity in ink, and adverse effects on writing properties. From the viewpoint of compatibility with the microcapsule pigment, it is preferably 0.2 to 5 μm, and more preferably 0.3 to 3 μm. The “average particle diameter” defined here is a value obtained by measuring the average particle diameter (50% diameter) with a particle size analyzer [Microtrac HRA9320-X100 (Nikkiso Co., Ltd.)] (refractive index 1.8). It is.

  If the average particle size is less than 0.2 μm, sufficient line density cannot be obtained. On the other hand, if it exceeds 5 μm, the writing property is deteriorated, the dispersion stability of the thermochromic microcapsule pigment is lowered, and the ink is caused by vibration. Back is likely to occur, which is not preferable. Further, the 90% diameter is 8 μm or less, preferably 6 μm or less. When particles having a large diameter are present in a certain ratio or more, the above-described influence tends to become more prominent. In addition, although the microcapsule pigment having an average particle diameter range (0.2 to 5 μm) described above varies depending on the microencapsulation method, in the phase separation method from an aqueous solution, stirring when the microcapsule pigment is produced. It can be prepared by suitably combining conditions.

  The specific gravity of the thermochromic microcapsule pigment is in the range of 0.9 to 1.3, preferably 1.0 to 1.2. If the specific gravity is outside this range, the dispersion stability of the microcapsule pigment tends to be lowered. In addition, microcapsule pigments having a specific gravity exceeding 1.3 are liable to generate ink back due to vibration.

  In the water-based ink composition for writing instruments, in addition to the thermochromic microcapsule pigment, the balance is water (tap water, purified water, distilled water, ion-exchanged water, pure water, etc.), and other writing instruments (ballpoint pens) Depending on the purpose of use, for marking pens, etc., water-soluble organic solvents, thickeners, lubricants, rust preventives, antiseptics or antibacterial agents may be appropriately contained within a range that does not impair the effect. it can.

  Examples of water-soluble organic solvents that can be used include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, polyethylene glycol, 3-butylene glycol, thiodiethylene glycol, and glycerin, ethylene glycol monomethyl ether, and diethylene glycol monomethyl. Ethers can be used alone or in combination.

  Among these, glycerin is preferably used for the purpose of suppressing ink solidification in the writing portion due to ink back, and the amount added is preferably 1 to 10% by mass with respect to the total amount of ink. Although the mechanism of action by glycerin is unknown, it is presumed that it has the effect of reducing the cohesive strength with the pigment and ink components in the dry state.

  As the thickener that can be used, for example, at least one selected from the group consisting of a synthetic polymer, cellulose, and polysaccharide is preferable. Specifically, gum arabic, gum tragacanth, guar gum, locust bean gum, alginic acid, carrageenan, gelatin, xanthan gum, welan gum, succinoglycan, diutane gum, dextran, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, starch glycolic acid and Salts thereof, propylene glycol alginate, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl methyl ether, polyacrylic acid and salts thereof, carboxyvinyl polymer, polyethylene oxide, copolymer of vinyl acetate and polyvinyl pyrrolidone, cross-linked acrylic acid polymer and Examples thereof include non-crosslinked acrylic acid polymers and salts thereof, styrene acrylic acid copolymers and salts thereof, and the like. That.

  Of these, it is preferable to use polysaccharides. Polysaccharides tend to be less susceptible to fluidity due to vibrations due to their rheological properties, and problems such as poor writing due to ink back are less likely to occur. Xanthan gum is particularly preferable because it is excellent in balance with other properties required for writing instrument inks.

  Lubricants include fatty acid esters of polyhydric alcohols, higher fatty acid esters of sugars, polyoxyalkylene higher fatty acid esters, alkyl phosphate esters, alkyl sulfonates of higher fatty acid amides, alkyl allyl sulfones, which are also used in pigment surface treatment agents. Examples thereof include acid salts, polyalkylene glycol derivatives, fluorine-based surfactants, and polyether-modified silicones. Examples of the rust inhibitor include benzotriazole, tolyltriazole, dicyclohexylammonium nitrite, and saponins. Examples of the antiseptic or antibacterial agent include phenol, sodium omadin, sodium benzoate, and benzimidazole compounds.

  In order to produce this water-based ink composition for writing instruments, a conventionally known method can be employed. For example, in addition to the thermochromic and photochromic microcapsule pigments, a predetermined amount of each component in the water is used. It is obtained by mixing and stirring and mixing with a homomixer or a stirrer such as a disper. Furthermore, if necessary, coarse particles in the ink composition may be removed by filtration or centrifugation.

The viscosity value of the aqueous ink composition for a writing instrument is preferably 500 to 2000 mPa · s at 25 ° C. and a shear rate of 3.83 / s, and 20 to 100 mPa · s at a shear rate of 383 / s. By setting the viscosity within the above range, the ink can be excellent in writability and stability over time. Furthermore, S = αD ⁿ (where 1>n> 0) (S is a shear stress (dyn / cm ² ), D is a shear rate (s ⁻¹ ), α is a non-Newtonian viscosity coefficient) The required non-Newtonian viscosity index n is preferably 0.2 to 0.6. By setting the non-Newtonian viscosity index n in the above range in addition to the above viscosity range, it is possible to appropriately set the fluidity of the ink with respect to vibration and to prevent the occurrence of ink back.

  The surface tension of the aqueous ink composition for writing instruments is preferably 25 to 45 mN / m, more preferably 30 to 40 mN / m. Within this range, the balance between the inside of the pen tip and the ink wettability becomes appropriate, and the occurrence of ink back can be prevented.

  In the refill, an ink follower may be disposed immediately behind the ink. The material constituting the follower can be composed of at least a non-volatile or hardly volatile organic solvent and a thickener. The non-volatile or hardly volatile organic solvent used for the ink follower is used as a base oil for the ink follower, and for example, liquid paraffin is used. Mineral oil and chemically synthesized oil are used as the liquid paraffin, and polybutene, poly α-olefin, ethylene α-olefin oligomer, and the like can be used as the chemically synthesized oil.

  Specific mineral oils that can be used include, for example, commercially available Diana Process Oil NS-100, PW-32, PW-90, NR-68, AH-58 (manufactured by Idemitsu Kosan Co., Ltd.).

  Specific polybutenes that can be used include, for example, the commercially available products Nissan Polybutene 200N, Polybutene 30N, Polybutene 10N, Polybutene 5N, Polybutene 3N, Polybutene 015N, Polybutene 06N, Polybutene 0N (above, manufactured by NOF Corporation), Polybutene HV-15 (made by Nippon Petrochemical Co., Ltd.), 35R (made by Idemitsu Kosan Co., Ltd.), etc. are mentioned.

  Specific poly α-olefins that can be used include, for example, commercially available barrel process oils P-26, P-46, P-56, P-150, P-350, P-1500, P-2200, (P-10000, P-37500) (manufactured by Matsumura Oil Co., Ltd.).

  Specific ethylene α-olefin oligomers that can be used include, for example, commercially available Lucant HC-10, HC-20, HC-100, HC-150, (HC-600, HC-2000). Chemical Co., Ltd.).

  These nonvolatile or hardly volatile organic solvents can be used alone or in combination of two or more.

  Examples of the thickener used for the ink follower include calcium phosphate phosphate, fine particle silica, polystyrene-polyethylene / butylene rubber-polystyrene block copolymer, polystyrene-polyethylene / propylene rubber-polystyrene block copolymer, and hydrogenated styrene. -Butadiene rubber, block copolymer of styrene-ethylenebutylene-olefin crystal, block copolymer of olefin crystal-ethylenebutylene-olefin crystal, acetoalkoxyaluminum dialchelate, and the like can be used, and these can be used alone or in combination.

  As a preferable commercially available calcium salt of phosphate ester that can be used, Crodax DP-301LA (manufactured by Croda Japan Co., Ltd.) and the like can be mentioned. The fine particle silica that can be used includes hydrophilic fine particle silica and hydrophobic fine particle silica. Preferred commercial products of hydrophilic silica include AEROSIL-300, AEROSIL-380 (manufactured by Nippon Aerosil Co., Ltd.), etc. Preferred examples of commercially available hydrophobic silica include AEROSIL-974D, AEROSIL-972 (manufactured by Nippon Aerosil Co., Ltd.) and the like.

  Examples of a commercially available block copolymer of polystyrene-polyethylene / butylene rubber-polystyrene include Kraton GFG-1901X, Kraton GG-1650 (manufactured by Shell Japan), Septon 8007, Septon 8004 (manufactured by Kuraray), and the like. Is mentioned. Furthermore, as a preferable commercial item of the block copolymer of polystyrene-polyethylene / propylene rubber-polystyrene, Kraton GG-1730 (manufactured by Shell Japan Co., Ltd.), Septon 2006, Septon 2063 (manufactured by Kuraray Co., Ltd.) and the like can be mentioned.

  Examples of preferable commercially available hydrogenated styrene-butadiene rubber include DYNARON 1320P, DYNARON 1321P (manufactured by JSR Corporation), Tuftec H1041, Tuftech H141 (manufactured by Asahi Kasei Kogyo Co., Ltd.), and the like.

  DYNARON 4600P (manufactured by JSR) and the like are mentioned as preferable commercial products of the block copolymer of styrene-ethylene butylene-olefin crystals, and DYNARON 6200P and DYNARON 6201B ( JSR) and the like.

  Plenact AL-M (manufactured by Ajinomoto Fine-Techno Co., Ltd.) and the like are preferable as a commercially available product of acetoalkoxy aluminum dial chelate.

  Among these thickeners, the use of thermoplastic olefin elastomers such as block copolymers of styrene-ethylene butylene-olefin crystals and block copolymers of olefin crystals-ethylene butylene-olefin crystals is preferred.

  Further, from the viewpoint of obtaining an ink follower that prevents the occurrence of ink back, the average value of tan δ values measured for each frequency while increasing exponentially in the frequency range of 1 to 63 rad / s should be 1.0 or more. Is preferable, and it is more preferable to set it as 1.7-3.4.

  Here, tan δ is a value meaning loss elastic modulus / storage elastic modulus, and conventionally, an average value of tan δ values measured for each frequency while increasing exponentially in the frequency region “1 to 63 rad / s”. Has been known to be preferably 1.0 or less. In the present invention, when the average value of the tan δ values measured for each frequency at 1 to 63 rad / s is 1.0 or more, it is possible to absorb vibration and prevent occurrence of ink back.

  When the friction body as an erasing member is accommodated in the writing instrument set, the material for forming the friction body is thermosetting rubber such as silicone rubber, nitrile rubber, ethylene propylene rubber, ethylene propylene diene rubber, styrene elastomer, olefin Rubber elastic materials such as elastomers and thermoplastic elastomers such as polyester elastomers, mixtures of two or more rubber elastic materials, and mixtures of rubber elastic materials and synthetic resins can be used, and are defined in JIS K7204. In a wear test (ASTM D1044), under a load of 9.8 N and 1000 rpm, the Taber wear tester wear wheel H-22 is configured so that the amount of Taber wear is less than 15 mg to form a friction body. The friction body is a part different from the writing instrument 2 or is formed on the outer surface of the operation unit 5. In addition, it is preferable to form the friction body in the same or similar shape as the writing instrument 2.

  Further, the friction body preferably has a durometer A hardness of 70 or more as defined in JIS K6203. Thereby, a predetermined hardness can be ensured and a more stable rubbing operation can be achieved. Note that the friction body can also be applied as a touch pen or a stylus pen, and may impart conductivity.

  Further, by setting the luminance value of the friction body to less than 70, the surface contamination associated with the use of the friction body can be made inconspicuous.

  The brightness value uses an HLS color space system with a range of 0 to 100, and measures the surface of the friction body using a measuring device such as a general-purpose color difference meter (TC-8600A, manufactured by Tokyo Denshoku Co., Ltd.). Is required.

  Further, the shaft cylinder 3 of the writing instrument 2 described above is based on JIS Z 2801 using engineering plastics such as polycarbonate as a base material, having a luminance value of 70 or more and containing an antibacterial agent or applying an antibacterial paint to the surface of the shaft cylinder. Antibacterial processed product-An antibacterial test is performed, and an antibacterial activity value of 2.0 or more can provide a hygienic writing instrument set that is easy to use in hospitals. The luminance value is obtained by measuring the surface of the shaft tube 3 using a measuring device such as a general-purpose color difference meter (TC-8600A, manufactured by Tokyo Denshoku Co., Ltd.) in the same manner as the friction body. In addition, it is preferable to apply the design 20 to the shaft cylinder 3 at that time by printing on a part of the shaft cylinder. Further, an antibacterial component such as an antibacterial agent can be included in other parts such as the friction body and the writing instrument case 30.

  The antibacterial agent will be described in detail. Examples of the antibacterial agent include 2- (4-thiazolyl) benzimidazole, 2-benzimidazolate carbamine methyl, 1- (butylcarbamoyl) 2-benzimidazole carbamate methyl, 2- (methoxycarbonyl). Imidazoles such as amino) benzimidazole, methyl 2- (benzimidazole) carbamate, 1,2-benzisothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, 2- (4-thio Cyanomethylthio) benzthiazole, thiazoles such as 5-chloro-2-methyl-4-isothiazolin-3-one, 3-iodo-2-propargylbutylcarbamic acid, 4-chlorophenyl-3-iodopropargyl formal, diiodomethyl -P-tolylsulfone, 3-d Iodo-based compounds such as xoxycarbonyloxy-1-bromo-1,2-diiodo-1-propene, 2,3,5,6-tetrachloroisophthalonitrile, 5-chloro-2,4,6-trifluoroisophthalo Nitriles such as nitriles, phenols such as p-chloro-m-cresol, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, N- (fluorodichloromethylthio) phthalimide, N, N-dimethyl-N ' -(Dichlorofluoromethylthio) -N'-phenylsulfamide, N, N-dimethyl-N '-(dichlorofluoromethylthio) -N'-tolylsulfamide, N- (trichloromethylthio) phthalimide, tetrachloroethylthio Tetrahydrophthalimide, N-trichloromethylthio-4-cyclohexene-1,2 Haloalkylthio such as dicarboximide, pyridine such as 2-pyridinethiol-1-oxide sodium, 2-pyridinethiol-1-oxide zinc, 2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine System, triazine system such as hexahydro-1,3,5-tris (2-hydroxyethyl) S-triazine, hexahydro-1,3,5-triethyl-S-triazine, 2-promo-2-nitro-1,3 -Bromines such as propanediol, 1,2-dibromo-2,4-dicyanobutane, silver-zeolite, zinc zeolite, silver-apatite, zirconium phosphate-silver, titania-silver, water-soluble glass-silver, calcium phosphate- Silver, zeolite-copper, zeolite-zinc, zinc oxide, magnesium oxide, amorphous copper, excess Inorganics such as sodium carbonate, sodium hypochlorite, barium metaborate, halodiallyl ureas such as trichlorocarban, chlorohexazine gluconate, chlorohexazine gluconate + cyclopyroxolamine, polyhexamethylenepyguanidine hydrochloride, etc. Guanidine, propyl glycol monofatty acid ester, fatty acid ester such as glycerin fatty acid ester, cellulose copper, copper crosslinked acrylonitrile / acrylic acid copolymer, metal oxide coordinated amino silicon polymer, zinc coordinated acrylic acid polymer, etc. Coordinate metal system, other 10,10'-oxybisphenoxyarsine, 8-oxyquinoline copper, methylene histiocyanate, bis (dimethyldithiocarbamoyl) disulfide, 1- (3-chloroallyl) -3,5,7- Riaza-1-azonia adamantane chloride, 3,5-dimethyltetrahydro-1,3,5-thiadiazin-2-thione, zinc dimethyldithiocarbamate, 4,4 ′-(2-ethyl-2-nitrotrimethylene) dimorpholine, Levanolytic agent, N- (2-hydroxypropyl) aminomethanol, 2- (methoxycarbonylamino) benzimidazole + 8-oxyquinoline copper, 5- (chloro-2-methyl-4-isothiazolin-3-one + 1,2, -Benzisothiazolin-3-one and the like, but 0.1 to 5 parts by weight of an antibacterial calcium phosphate carrying an antibacterial metal ion and a phosphorous stabilizer 0.01 with respect to 100 parts by weight of the base. It is preferable to mix -1.0 part by weight.

The antibacterial calcium phosphates listed here are hydroxyapatite represented by tricalcium phosphate, Ca ₁₀ (PO ₄ ) ₆ (OH) ₂ , or a part of calcium ions of apatite in which a part of the OH group is substituted with fluorine or iodine. These are antibacterial calcium phosphates in which the antibacterial metal ion is incorporated into the pores of the molecular structure of these calcium phosphates. The antibacterial metal ions referred to here are ions of silver, copper and zinc. The amount of antibacterial metal ions supported on the antibacterial calcium phosphates is 30% by weight or less, preferably 0.0001 to 5% by weight, based on the calcium phosphates. The usage-amount of antibacterial calcium phosphates is 0.1-5 weight part with respect to 100 weight part of resin, Preferably it is 0.5-2 weight part. If the amount used is less than 0.1 parts by weight, sufficient antibacterial properties cannot be obtained, and if it is more than 5 parts by weight, the antibacterial properties are not further improved and the mechanical properties are lowered.

  The phosphorus stabilizer is phosphoric acid, phosphorous acid or phosphonic acid ester or partial ester, alkaline earth metal salt, zinc group metal salt and the like. For example, trimethyl phosphate, tributyl phosphate, tricresyl phosphate, triphenyl phosphate, trichlorophenyl phosphate, triethyl phosphate, diphenyl cresyl phosphate, diphenyl monoorthoxenyl phosphate, tributoxyethyl phosphate, phenylphosphonic acid dimethyl ester, 3,5- Ditertiary butyl-4-hydroxybenzylphosphonic acid dimethyl ester, dibutyl phosphate, dioctyl phosphate, diisopropyl phosphate, triphenyl phosphite, trimethyl phosphite, tricresyl phosphite, diphenyl nonylphenyl phosphite, tris (nonylphenyl) phosphite , Triisooctyl phosphite, diphenylisodecyl phosphite Ite, triisodecyl phosphite, trioleyl phosphite, trilauryl trithiophosphite, diisodecyl phosphite, dilauryl phosphite, dioleyl phosphite, tris (2,4-ditertiary butylphenyl) phosphite, distearyl pena And terisitol diphosphite. Of these, trimethyl phosphate, tris (nonylphenyl) phosphite, and distearyl pentaerythritol diphosphite are preferable. The usage-amount of a phosphorus stabilizer is 0.01-1.0 weight part with respect to 100 weight part of resin, Preferably it is 0.02-0.2 weight part. When the amount used is less than 0.01 parts by weight, sufficient thermal stability cannot be obtained, and when it is more than 1.0 parts by weight, the resin deteriorates.

DESCRIPTION OF SYMBOLS 1 Writing instrument set 2 Writing instrument 3 Shaft cylinder 4 Clip 5 Operation part 6 Refill 7 Spring 10 Film 20 Design 30 Writing instrument case

Claims (5)

A writing instrument set consisting of a plurality of writing instruments,
A writing instrument set, wherein a plurality of writing instruments are designed so as to be integrated as a series when adjacent to each other in the same orientation.   The writing instrument set according to claim 1, wherein each of the plurality of writing instruments has the same outer shape.   In each of the plurality of writing instruments, the same design is applied to each of the plurality of writing instruments, and when the plurality of writing instruments are arranged adjacent to each other in the same orientation, the entire design can be visually recognized as a single unit. The writing instrument set according to claim 1 or 2, wherein the applied design is shifted by a predetermined interval around a central axis.   4. Each of the plurality of writing tools has a clip, and each of the plurality of writing tools is arranged adjacent to each other in the same orientation by gripping a support member with the clip. The writing instrument set according to one item.   The writing instrument set according to any one of claims 1 to 4, wherein at least one of the plurality of writing instruments is a thermochromic writing instrument.