WO2023054201A1 - Ink storage tube for writing utensils, inner core for writing utensils, and writing utensil - Google Patents

Ink storage tube for writing utensils, inner core for writing utensils, and writing utensil Download PDF

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Publication number
WO2023054201A1
WO2023054201A1 PCT/JP2022/035507 JP2022035507W WO2023054201A1 WO 2023054201 A1 WO2023054201 A1 WO 2023054201A1 JP 2022035507 W JP2022035507 W JP 2022035507W WO 2023054201 A1 WO2023054201 A1 WO 2023054201A1
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Prior art keywords
ink
resin
storage tube
biomass material
ink storage
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PCT/JP2022/035507
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French (fr)
Japanese (ja)
Inventor
有加里 村田
卓也 横山
恵梨子 田中
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ゼブラ株式会社
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Publication of WO2023054201A1 publication Critical patent/WO2023054201A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K7/00—Ball-point pens
    • B43K7/02—Ink reservoirs; Ink cartridges
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment

Definitions

  • the present invention relates to an ink container for writing instruments, a core for writing instruments, and a writing instrument.
  • Patent Literature 1 proposes that an ink storage tube of a writing instrument and the like be made of polylactic acid resin as a biomass material.
  • the present invention has been made in view of the above circumstances, and while reducing the amount of petroleum-derived plastic used, it is possible to improve the storage stability of the core compared to biodegradable resins such as polylactic acid resin.
  • a core for the writing instrument and a writing instrument that can be used.
  • the present invention is an ink container for a writing instrument containing a resin, wherein the resin contains a biomass material and the biomass material is a polyolefin resin.
  • the amount of petroleum-derived plastics used can be reduced by including the biomass material in the resin.
  • the biomass material is polyolefin resin, and polyolefin resin is less likely to absorb moisture and swell compared to biodegradable resin such as polylactic acid resin.
  • polyolefin resins are not biodegradable, they are less likely to deteriorate than biodegradable resins such as polylactic acid resins. Therefore, even if the ink is stored in the ink storage tube, the decrease of the solvent from the ink through the ink storage tube is suppressed.
  • the ink storage tube of the present invention can improve the storage stability of the core as compared with biodegradable resin such as polylactic acid resin. Therefore, when the ink storage tube stores ink and is used in a writing instrument, the writing instrument can be used for a long period of time.
  • the biomass material is a polyolefin resin that absorbs less moisture than a biodegradable resin such as polylactic acid resin, it is possible to further suppress collapse and clouding of the ink storage tube due to moisture absorption. Therefore, it is possible to prevent the amount of ink remaining in the ink containing tube from becoming difficult to visually recognize.
  • the content of the biomass material is 80% by mass or less in the ink storage tube for a writing instrument.
  • the ink storage tube tends to improve the storage stability of the core.
  • the resin further contains a non-biomass material, and the non-biomass material is a polyolefin resin.
  • the non-biomass material is also polyolefin resin, and polyolefin resin is less likely to absorb moisture, swell, and deteriorate compared to biodegradable resins such as polylactic acid resin. Therefore, the ink storage tube tends to further improve the storage stability of the core. Moreover, since both the biomass material and the non-biomass material are polyolefin resins, the transparency of the ink storage tube can be further improved. Therefore, when ink is stored in the ink storage tube, it is possible to easily visually recognize the remaining amount of ink.
  • both the biomass material and the non-biomass material are polyolefin resins that absorb less moisture than biodegradable resins such as polylactic acid resin, collapse of the ink storage tube and clouding due to moisture absorption can be further suppressed. can be done. For this reason, it is further suppressed that the amount of ink remaining in the ink containing tube becomes difficult to visually recognize.
  • the polyolefin resin constituting the non-biomass material is polypropylene resin
  • the polyolefin resin constituting the biomass material is polyethylene resin
  • the ink containing tube it is possible for the ink containing tube to have an appropriate bending strength. Moreover, it is possible to suppress the occurrence of distortion in the shape of the end surface of the ink storage tube. Therefore, when a member such as a tip or a joint is fitted to the ink containing tube, the work can be easily performed. It is also possible to make cracks less likely to occur at the end of the ink storage tube.
  • the polyethylene resin is a high-density polyethylene resin.
  • the ink storage tube is more difficult for the solvent in the ink to permeate. Therefore, the ink storage tube can further improve the storage stability of the core. Further, when the polyethylene resin is a high-density polyethylene resin, the melting point of the polyethylene resin becomes high and approaches the melting point of the polypropylene resin. Therefore, even if the writing instrument is placed in a high-temperature environment, the ink reservoir tube is less likely to deform.
  • the polyolefin resin constituting the non-biomass material may be a polypropylene resin
  • the polyolefin resin constituting the biomass material may be a polypropylene resin.
  • the polyolefin resin that constitutes the biomass material and the non-biomass material is a polypropylene resin and has good compatibility, so that the homogeneity of the ink storage tube can be improved.
  • the polyolefin resin constituting the biomass material and the non-biomass material is polypropylene resin, the mechanical properties of the ink storage tube can be improved.
  • the content of the biomass material in the resin may be 100% by mass, and the polyolefin resin constituting the biomass material may be a polypropylene resin.
  • the content of the biomass material in the resin is 100% by mass, it is possible to improve the homogeneity of the ink storage tube.
  • the polyolefin resin constituting the biomass material is polypropylene resin, the mechanical properties of the ink storage tube can be improved.
  • the bending elastic modulus of the biomass material is preferably 100 to 2100 MPa.
  • the ink containing tube it is possible for the ink containing tube to have an appropriate bending strength. Moreover, it is possible to suppress the occurrence of distortion in the shape of the end surface of the ink storage tube. Therefore, when a member such as a ballpoint pen tip or a joint is fitted to the ink storage tube, the work can be easily performed. It is also possible to make cracks less likely to occur at the end of the ink storage tube.
  • the biomass material has a water vapor permeability of 25 g/m 2 ⁇ atm 24 hr/25 ⁇ m or less under conditions of 40 ° C. and 90% RH, and an oxygen permeability of 20 ° C. and 90%. It is preferably 20000 mL/m 2 ⁇ atm ⁇ 24 hr/25 ⁇ m or less under RH conditions.
  • the present invention is a core for a writing instrument comprising the ink storage tube for a writing instrument described above and ink stored in the ink storage tube for the writing instrument.
  • the ink storage tube can reduce the amount of petroleum-derived plastic used and improve the storage stability of the core compared to biodegradable resins such as polylactic acid resin. can. Therefore, when the core of the present invention is used in a writing instrument, the writing instrument can be used continuously for a long period of time.
  • the core of the present invention it is possible to suppress collapse and cloudiness due to moisture absorption of the ink storage tube. It is possible to prevent the remaining amount of ink from becoming difficult to visually recognize.
  • the present invention also provides a writing instrument having the core for a writing instrument described above.
  • the core can improve the storage stability of the core compared to biodegradable resins such as polylactic acid resin while reducing the amount of petroleum-derived plastic used. , can be used for a long time.
  • biodegradable resins such as polylactic acid resin
  • collapse and cloudiness due to moisture absorption of the ink storage tube can be suppressed, so even when the core is taken out to check the remaining ink amount as necessary, the remaining ink amount becomes difficult to visually recognize. is suppressed.
  • an ink storage tube for a writing instrument and a writing instrument that can improve the storage stability of the core compared to biodegradable resin such as polylactic acid resin while reducing the amount of petroleum-derived plastic used.
  • a writing medium and a writing instrument can be provided.
  • the ink storage tube for a writing instrument of this embodiment is an ink storage tube for a writing instrument containing a resin, the resin containing a biomass material, and the biomass material being a polyolefin resin.
  • the amount of petroleum-derived plastics used can be reduced by including a biomass material in the resin.
  • the biomass material is a polyolefin resin, and the polyolefin resin is less likely to absorb moisture and swell compared to biodegradable resins such as polylactic acid resin.
  • polyolefin resins are not biodegradable, they are less likely to deteriorate than biodegradable resins such as polylactic acid resins. Therefore, even if the ink is stored in the ink storage tube, the decrease of the solvent from the ink through the ink storage tube is suppressed.
  • the ink storage tube of the present invention can improve the storage stability of the core as compared with biodegradable resin such as polylactic acid resin. Therefore, when the ink storage tube stores ink and is used in a writing instrument, the writing instrument can be used for a long period of time.
  • the biomass material is a polyolefin resin that absorbs less moisture than a biodegradable resin such as polylactic acid resin, it is possible to further suppress collapse and clouding of the ink storage tube due to moisture absorption. Therefore, it is possible to prevent the amount of ink remaining in the ink containing tube from becoming difficult to visually recognize.
  • ink storage tube for writing instruments (hereinafter simply referred to as “ink storage tube”) of the present embodiment will be described below.
  • This biomass material is a polyolefin resin.
  • the polyolefin resin which is a biomass material, may be obtained using a raw material containing a plant-derived monomer, and the raw material may be a raw material containing only a plant-derived monomer. Raw materials containing animal-derived monomers may also be used. Examples of the monomer include olefins such as ethylene and propylene.
  • Polyolefin resins include polyethylene resins, polypropylene resins, ethylene-vinyl acetate copolymers, and polymethylpentene resins. These may be used alone or in combination of two or more.
  • the resin may further contain non-biomass materials.
  • Non-biomass materials include polyolefin resins such as polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, and polymethylpentene resin.
  • the non-biomass material is also polyolefin resin, and polyolefin resin is less likely to absorb moisture and is less likely to deteriorate compared to biodegradable resin such as polylactic acid resin. Therefore, the ink storage tube tends to further improve the storage stability of the core.
  • both the biomass material and the non-biomass material are polyolefin resins, the transparency of the ink storage tube can be further improved. Therefore, when ink is stored in the ink storage tube, it is possible to easily visually recognize the remaining amount of ink.
  • both the biomass material and the non-biomass material are polyolefin resins that absorb less moisture than biodegradable resins such as polylactic acid resin, collapse of the ink storage tube and clouding due to moisture absorption can be further suppressed. can be done. For this reason, it is further suppressed that the amount of ink remaining in the ink containing tube becomes difficult to visually recognize.
  • the content of biomass material in the resin is not particularly limited as long as it is greater than 0% by mass, and may be 100% by mass, but is preferably 80% by mass or less.
  • the ink storage tube tends to further improve the storage stability of the core.
  • the content of biomass material in the resin is more preferably 60% by mass or less. However, from the viewpoint of further reducing the amount of petroleum-derived plastic used, it is preferably 25% by mass or more.
  • the polyolefin resin that constitutes the non-biomass material is a polypropylene resin
  • the polyolefin resin that constitutes the biomass material is a polyethylene resin
  • the ink containing tube it is possible for the ink containing tube to have an appropriate bending strength. Moreover, it is possible to suppress the occurrence of distortion in the shape of the end surface of the ink storage tube. Therefore, when a member such as a tip or a joint is fitted to the ink containing tube, the work can be easily performed. It is also possible to make cracks less likely to occur at the end of the ink storage tube.
  • the polypropylene resin may be a homopolypropylene resin or a copolymer of a propylene resin and another monomer, but is preferably a homopolypropylene resin.
  • the ink storage tube can have high rigidity, high glossiness, and high heat resistance due to high crystallinity.
  • polyethylene resins include low-density polyethylene resins, linear low-density polyethylene resins, and high-density polyethylene resins.
  • the polyethylene resin is preferably a high-density polyethylene resin.
  • the ink storage tube becomes more difficult to permeate the solvent in the ink. Therefore, the ink storage tube can further improve the storage stability of the core.
  • the polyethylene resin is a high-density polyethylene resin
  • the melting point of the polyethylene resin becomes high and approaches the melting point of the polypropylene resin.
  • the ink reservoir tube is less likely to deform.
  • the polyolefin resin that constitutes the non-biomass material may be a polypropylene resin
  • the polyolefin resin that constitutes the biomass material may be a polypropylene resin.
  • the polyolefin resin that constitutes the biomass material and the non-biomass material is a polypropylene resin and has good compatibility, so that the homogeneity of the ink storage tube can be improved.
  • the polyolefin resin constituting the biomass material and the non-biomass material is polypropylene resin
  • the resin may consist only of biomass material. That is, in the ink storage tube for writing instruments, the content of the biomass material in the resin may be 100% by mass.
  • the polyolefin resin constituting the biomass material may be a polypropylene resin. In this case, since the content of the biomass material in the resin is 100% by mass, it is possible to improve the homogeneity of the ink storage tube.
  • the polyolefin resin constituting the biomass material is polypropylene resin, the mechanical properties of the ink storage tube can be improved.
  • the flexural modulus of the biomass material is not particularly limited, it is preferably 100 to 2100 MPa. In this case, it becomes possible for the ink containing tube to have an appropriate bending strength. Moreover, it is possible to suppress the occurrence of distortion in the shape of the end surface of the ink storage tube. Therefore, when a member such as a ballpoint pen tip or a joint is fitted to the ink storage tube, the work can be easily performed. It is also possible to make cracks less likely to occur at the end of the ink storage tube.
  • the flexural modulus of the biomass material is more preferably 500-1800 MPa, particularly preferably 800-1500 MPa.
  • the water vapor permeability and oxygen permeability of the biomass material are not particularly limited, the water vapor permeability is 25 g / m 2 ⁇ atm ⁇ 24 hr / 25 ⁇ m or less under the conditions of 40 ° C. and 90% RH, and oxygen permeability The degree is preferably 20000 mL/m 2 ⁇ atm ⁇ 24 hr/25 ⁇ m or less under the conditions of 20°C and 90% RH.
  • the water vapor permeability is more preferably 20 g/m 2 ⁇ atm ⁇ 24 hr/25 ⁇ m or less, and particularly preferably 16 g/m 2 ⁇ atm 24 hr/25 ⁇ m or less.
  • the oxygen permeability is more preferably 15000 mL/m 2 ⁇ atm ⁇ 24 hr/25 ⁇ m or less, and particularly preferably 13000 mL/m 2 ⁇ atm 24 hr/25 ⁇ m or less.
  • the shape of the ink storage tube is not particularly limited as long as it is tubular, but it is usually cylindrical.
  • the ink storage tube may be composed of a single layer or multiple layers.
  • the ink storage tube may contain additives other than the resin, if necessary.
  • Additives include, for example, surface smoothing agents, compatibilizers, and colorants.
  • FIG. 1 is a schematic cross-sectional view showing a ballpoint pen that is one embodiment of the writing instrument of the present invention.
  • the core 10 is housed in the ink containing tube 14, the ballpoint pen tip 20 provided on the tip side of the ink containing tube 14, the joint 22 for fixing the ballpoint pen tip 20 to the tip of the ink containing tube 14, and the ink containing tube 14. and a backflow preventing member 16 arranged in the ink containing tube 14 to prevent backflow of the ink 12.
  • the ballpoint pen tip 20 is composed of a ball holder 24 and a ball 26.
  • the backflow preventer 16 is housed in the ink housing tube 14 adjacent to the ink 12 on the opposite side of the ink 12 from the ballpoint pen tip 20 side.
  • the anti-backflow element 16 is arranged so as not to create a gap between itself and the ink 12 .
  • the ballpoint pen tip 20 of the core 10 protrudes from the tip of the main body tube 18, and the rear end of the ink storage tube 14 of the core 10 abuts the tail plug 28.
  • the tail plug 28 has a vent, and this vent communicates with the space inside the ink reservoir tube.
  • the constituent elements of the ballpoint pen 100 will be described below, but the general configuration used for ballpoint pens can be applied to the configuration other than the ink storage tube 14 .
  • the ink 12 may contain a solvent and a coloring agent, and may be water-based ink or oil-based ink.
  • Colorants include pigments and dyes. These can be used individually or in mixture of 2 or more types, respectively.
  • the backflow prevention member 16 has a function of preventing ink from flowing out (outflow prevention property) and a function of preventing ink from drying up (sealing property). be able to.
  • a backflow preventer 16 includes, for example, a base oil and a thickening agent.
  • Base oils include mineral oil, polybutene, silicon oil, glycerin, polyalkylene glycol, and the like.
  • thickening agents include metallic soap thickeners, organic thickeners, inorganic thickeners, and the like.
  • main tube 18 and the tail plug 28 for example, those made of a plastic material such as polypropylene resin can be used.
  • the joint 22 can be made of polypropylene resin, polyethylene resin, polyethylene terephthalate resin, nylon resin, polyacetal resin, polycarbonate resin, polybutylene terephthalate resin, or the like.
  • the ball holder 24 and the ball 26 in the ball-point pen tip 20 those used in ordinary ball-point pens can be used.
  • the diameter of the ball 26 is preferably 0.2 to 1.6 mm.
  • the ink storage tube 14 reduces the amount of petroleum-derived plastic used and improves the storage stability of the core 10 compared to biodegradable resins such as polylactic acid resin. be able to. Therefore, when the core 10 is used in the ball-point pen 100, the ball-point pen 100 can be used continuously for a long period of time. Further, according to the core 10, collapse and cloudiness due to moisture absorption of the ink storage tube 14 can be suppressed. , it is suppressed that the remaining amount of ink becomes difficult to visually recognize.
  • the ball-point pen 100 of this embodiment uses the core 10 having the features described above, the ball-point pen 100 can be used continuously for a long period of time. Further, according to the ball-point pen 100, collapse and cloudiness due to moisture absorption of the ink storage tube 14 can be suppressed, so even when the core 10 is taken out to check the remaining ink amount as necessary, the remaining ink amount becomes difficult to visually recognize. is suppressed.
  • the ballpoint pen is not limited to the above embodiment.
  • the ball-point pen of this embodiment may not have the main tube 18, and the ink storage tube 14 may be the main tube as it is.
  • the ball-point pen according to the present embodiment has a pressurizing mechanism that presses the ink 12 and the backflow prevention member 16 in the ink containing tube 14 from the rear end (one end on the side opposite to the ball-point pen tip 20). may have Also, the ball-point pen according to the present embodiment may not have the backflow prevention member 16 .
  • the writing instrument of the present invention is not limited to a ballpoint pen, and may be, for example, a marking pen including a calligraphy pen, or a writing instrument using a valve mechanism in the ink discharge part.
  • the ink storage tube of the present invention may be used like the outer skin of the ink occlusion body for a marking pen.
  • the outline of the present invention is as follows. [1] An ink storage tube for a writing instrument containing a resin, wherein the resin contains a biomass material, and the biomass material is a polyolefin resin. [2] The ink storage tube for a writing instrument according to [1], wherein the content of the biomass material is 80% by mass or less. [3] The ink container for a writing instrument according to [1] or [2], wherein the resin further contains a non-biomass material, and the non-biomass material is a polyolefin resin.
  • the water vapor permeability of the biomass material is 25 g/m 2 ⁇ atm 24 hr/25 ⁇ m or less under the conditions of 40 ° C. and 90% RH, and the oxygen permeability is 20 ° C. and 90% RH.
  • the ink reservoir for writing instruments according to any one of [1] to [8], which is 20000 mL/m 2 ⁇ atm ⁇ 24hr/25 ⁇ m or less.
  • a core for a writing instrument comprising the ink storage tube for a writing instrument according to any one of [1] to [9], and ink stored in the ink storage tube for the writing instrument.
  • Examples 1-7 and Comparative Examples 1-2 For each of Examples 1 to 7 and Comparative Examples 1 and 2, the non-biomass materials and biomass materials shown in Table 1 below were prepared, kneaded in the blending amounts (parts by mass) shown in the table, and then extruded into a cylindrical shape. The extrudate was cut to a length of 9 cm. In this way, an ink storage tube having a length of 9 cm, a thickness of 0.7 mm and an inner diameter of 2.5 mm was produced.
  • Examples 1-7 can improve core storage stability more than Comparative Examples 1-2. Therefore, it was confirmed that the ink storage tube of the present invention can reduce the amount of petroleum-derived plastic used and improve the storage stability of the core compared to biodegradable resins such as polylactic acid resin. .

Abstract

The present invention discloses an ink storage tube for writing utensils, the ink storage tube containing a resin which contains a biomass material that is composed of a polyolefin resin. The content ratio of the biomass material may be 80% by mass or less. The resin additionally contains a non-biomass material; and the non-biomass material may be a polyolefin resin.

Description

筆記具用インキ収容管、筆記具用中芯及び筆記具Ink storage tube for writing instruments, core for writing instruments and writing instruments
　本発明は、筆記具用インキ収容管、筆記具用中芯及び筆記具に関する。 The present invention relates to an ink container for writing instruments, a core for writing instruments, and a writing instrument.
　ボールペン等の筆記具には、インキを収容するインキ収容管を有する中芯が使用されており、インキ収容管は、ポリプロピレン樹脂などの樹脂で構成されることが多い。しかし、近年の石油資源の枯渇等の観点から、石油由来のプラスチックの使用量を低減することが提案されている。そこで、下記特許文献１では、筆記具のインキ収容管などをバイオマス材料としてのポリ乳酸樹脂で構成することが提案されている。 Writing instruments such as ballpoint pens use a core that has an ink storage tube that stores ink, and the ink storage tube is often made of resin such as polypropylene resin. However, in view of the depletion of petroleum resources in recent years, it has been proposed to reduce the amount of petroleum-derived plastics used. In view of this, Patent Literature 1 below proposes that an ink storage tube of a writing instrument and the like be made of polylactic acid resin as a biomass material.
特開平８－２１６５８２号公報JP-A-8-216582
　しかし、上記特許文献１に記載のインキ収容管は、石油由来プラスチックの使用量を低減できるものの、インキ収容管にインキを収容すると、時間の経過とともにインキ中の溶媒が減少しやすくなり、中芯の保存安定性の点で改善の余地を有していた。 However, although the ink storage tube described in Patent Document 1 can reduce the amount of petroleum-derived plastic used, when ink is stored in the ink storage tube, the solvent in the ink tends to decrease over time, and the core However, there is still room for improvement in terms of storage stability.
　本発明は上記事情に鑑みてなされたものであり、石油由来プラスチックの使用量を低減しつつ、ポリ乳酸樹脂などの生分解性樹脂と比較して、中芯の保存安定性を向上させることができる筆記具用インキ収容管、筆記具用中芯及び筆記具を提供することを目的とする。 The present invention has been made in view of the above circumstances, and while reducing the amount of petroleum-derived plastic used, it is possible to improve the storage stability of the core compared to biodegradable resins such as polylactic acid resin. To provide an ink storage tube for a writing instrument, a core for the writing instrument, and a writing instrument that can be used.
　本発明者らは上記課題が生じる原因について検討した。その結果、ポリ乳酸樹脂などの生分解性樹脂は生分解性を有するため、吸湿して膨潤すると、劣化しやすくなり、劣化の進行に伴って、インキ中の溶媒の流出速度が増大していくのではないかと考えた。そこで、本発明者らはさらに鋭意研究を重ねた結果、以下の発明により上記課題を解決し得ることを見出した。 The inventors investigated the causes of the above problems. As a result, since biodegradable resins such as polylactic acid resins are biodegradable, when they absorb moisture and swell, they easily deteriorate. I thought it might be. Therefore, the inventors of the present invention have further conducted extensive research, and as a result, have found that the above problems can be solved by the following inventions.
　すなわち、本発明は、樹脂を含む筆記具用インキ収容管であって、前記樹脂がバイオマス材料を含み、前記バイオマス材料がポリオレフィン樹脂である筆記具用インキ収容管である。 That is, the present invention is an ink container for a writing instrument containing a resin, wherein the resin contains a biomass material and the biomass material is a polyolefin resin.
　本発明の筆記具用インキ収容管によれば、樹脂がバイオマス材料を含むことで、石油由来プラスチックの使用量を低減することができる。また、バイオマス材料がポリオレフィン樹脂であり、ポリオレフィン樹脂は、ポリ乳酸樹脂などの生分解性樹脂と比較して、吸湿しにくく膨潤しにくい。さらにポリオレフィン樹脂は生分解性を有さないため、ポリ乳酸樹脂などの生分解性樹脂と比較して劣化もしにくい。このため、インキ収容管にインキを収容させても、インキからインキ収容管を通して溶媒が減少することが抑制される。すなわち、本発明のインキ収容管は、ポリ乳酸樹脂などの生分解性樹脂と比較して、中芯の保存安定性を向上させることができる。このため、インキ収容管を、インキを収容して筆記具に使用した場合に、筆記具を長期間にわたって使用することができる。また、バイオマス材料が、ポリ乳酸樹脂などの生分解性樹脂と比較して吸湿しにくいポリオレフィン樹脂であるため、吸湿によりインキ収容管が崩壊することや白濁することをより抑制することができる。このため、インキ収容管内のインキ残量が視認しにくくなることが抑制される。 According to the ink storage tube for writing instruments of the present invention, the amount of petroleum-derived plastics used can be reduced by including the biomass material in the resin. Moreover, the biomass material is polyolefin resin, and polyolefin resin is less likely to absorb moisture and swell compared to biodegradable resin such as polylactic acid resin. Furthermore, since polyolefin resins are not biodegradable, they are less likely to deteriorate than biodegradable resins such as polylactic acid resins. Therefore, even if the ink is stored in the ink storage tube, the decrease of the solvent from the ink through the ink storage tube is suppressed. That is, the ink storage tube of the present invention can improve the storage stability of the core as compared with biodegradable resin such as polylactic acid resin. Therefore, when the ink storage tube stores ink and is used in a writing instrument, the writing instrument can be used for a long period of time. In addition, since the biomass material is a polyolefin resin that absorbs less moisture than a biodegradable resin such as polylactic acid resin, it is possible to further suppress collapse and clouding of the ink storage tube due to moisture absorption. Therefore, it is possible to prevent the amount of ink remaining in the ink containing tube from becoming difficult to visually recognize.
　上記筆記具用インキ収容管においては、前記バイオマス材料の含有率が８０質量％以下であることが好ましい。 It is preferable that the content of the biomass material is 80% by mass or less in the ink storage tube for a writing instrument.
　この場合、インキ収容管は、中芯の保存安定性をより向上させる傾向がある。 In this case, the ink storage tube tends to improve the storage stability of the core.
　上記筆記具用インキ収容管においては、前記樹脂が、非バイオマス材料をさらに含み、前記非バイオマス材料が、ポリオレフィン樹脂であることが好ましい。 In the above ink container for writing instruments, it is preferable that the resin further contains a non-biomass material, and the non-biomass material is a polyolefin resin.
　この場合、非バイオマス材料もポリオレフィン樹脂であり、ポリオレフィン樹脂は、ポリ乳酸樹脂などの生分解性樹脂と比較して、吸湿して膨潤しにくく、劣化もしにくい。このため、インキ収容管は、中芯の保存安定性をより向上させる傾向がある。また、バイオマス材料も非バイオマス材料もポリオレフィン樹脂であるため、インキ収容管の透明性をより向上させることができる。このため、インキ収容管にインキを収容させると、インキ残量を容易に視認することが可能となる。さらに、バイオマス材料も非バイオマス材料も、ポリ乳酸樹脂などの生分解性樹脂と比較して吸湿しにくいポリオレフィン樹脂であるため、吸湿によりインキ収容管が崩壊することや白濁することをより抑制することができる。このため、インキ収容管内のインキ残量が視認しにくくなることがより抑制される。 In this case, the non-biomass material is also polyolefin resin, and polyolefin resin is less likely to absorb moisture, swell, and deteriorate compared to biodegradable resins such as polylactic acid resin. Therefore, the ink storage tube tends to further improve the storage stability of the core. Moreover, since both the biomass material and the non-biomass material are polyolefin resins, the transparency of the ink storage tube can be further improved. Therefore, when ink is stored in the ink storage tube, it is possible to easily visually recognize the remaining amount of ink. Furthermore, since both the biomass material and the non-biomass material are polyolefin resins that absorb less moisture than biodegradable resins such as polylactic acid resin, collapse of the ink storage tube and clouding due to moisture absorption can be further suppressed. can be done. For this reason, it is further suppressed that the amount of ink remaining in the ink containing tube becomes difficult to visually recognize.
　上記筆記具用インキ収容管においては、前記非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、前記バイオマス材料を構成するポリオレフィン樹脂がポリエチレン樹脂であることが好ましい。 In the above ink container for writing instruments, it is preferable that the polyolefin resin constituting the non-biomass material is polypropylene resin, and the polyolefin resin constituting the biomass material is polyethylene resin.
　この場合、インキ収容管が適度な曲げ強度を有することが可能となる。また、インキ収容管の端面の形状に歪みが生じることを抑制することもできる。このため、インキ収容管にチップやジョイントなどの部材を嵌合させる際、その作業を容易に行うことができる。また、インキ収容管の端部に亀裂を生じにくくさせることも可能となる。 In this case, it is possible for the ink containing tube to have an appropriate bending strength. Moreover, it is possible to suppress the occurrence of distortion in the shape of the end surface of the ink storage tube. Therefore, when a member such as a tip or a joint is fitted to the ink containing tube, the work can be easily performed. It is also possible to make cracks less likely to occur at the end of the ink storage tube.
　上記筆記具用インキ収容管においては、前記ポリエチレン樹脂が高密度ポリエチレン樹脂であることが好ましい。 In the above-mentioned ink storage tube for writing instruments, it is preferable that the polyethylene resin is a high-density polyethylene resin.
　この場合、ポリエチレン樹脂が高密度ポリエチレン樹脂以外のポリエチレン樹脂である場合に比べて、インキ収容管がインキ中の溶媒を透過させにくくなる。このため、インキ収容管が中芯の保存安定性をより向上させることができる。また、ポリエチレン樹脂が高密度ポリエチレン樹脂であると、ポリエチレン樹脂の融点が高くなり、ポリプロピレン樹脂の融点に近づく。このため、筆記具が高温環境下に置かれても、インキ収容管が変形しにくくなる。 In this case, compared to the case where the polyethylene resin is a polyethylene resin other than high-density polyethylene resin, the ink storage tube is more difficult for the solvent in the ink to permeate. Therefore, the ink storage tube can further improve the storage stability of the core. Further, when the polyethylene resin is a high-density polyethylene resin, the melting point of the polyethylene resin becomes high and approaches the melting point of the polypropylene resin. Therefore, even if the writing instrument is placed in a high-temperature environment, the ink reservoir tube is less likely to deform.
　上記筆記具用インキ収容管においては、前記非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、前記バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であってもよい。
　この場合、バイオマス材料及び非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、相溶性が良好であるため、インキ収容管の均質性を向上させることができる。また、バイオマス材料及び非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であるため、インキ収容管の機械的特性を向上させることができる。 In the ink storage tube for a writing instrument, the polyolefin resin constituting the non-biomass material may be a polypropylene resin, and the polyolefin resin constituting the biomass material may be a polypropylene resin.
In this case, the polyolefin resin that constitutes the biomass material and the non-biomass material is a polypropylene resin and has good compatibility, so that the homogeneity of the ink storage tube can be improved. Moreover, since the polyolefin resin constituting the biomass material and the non-biomass material is polypropylene resin, the mechanical properties of the ink storage tube can be improved.
　上記筆記具用インキ収容管においては、前記樹脂中の前記バイオマス材料の含有率が１００質量％であり、前記バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であってもよい。
　この場合、樹脂中のバイオマス材料の含有率が１００質量％であるため、インキ収容管の均質性を向上させることができる。また、バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であるため、インキ収容管の機械的特性を向上させることができる。 In the ink storage tube for a writing instrument, the content of the biomass material in the resin may be 100% by mass, and the polyolefin resin constituting the biomass material may be a polypropylene resin.
In this case, since the content of the biomass material in the resin is 100% by mass, it is possible to improve the homogeneity of the ink storage tube. Moreover, since the polyolefin resin constituting the biomass material is polypropylene resin, the mechanical properties of the ink storage tube can be improved.
　上記筆記具用インキ収容管においては、バイオマス材料の曲げ弾性率が１００～２１００ＭＰａであることが好ましい。 In the ink storage tube for writing instruments, the bending elastic modulus of the biomass material is preferably 100 to 2100 MPa.
　この場合、インキ収容管が適度な曲げ強度を有することが可能となる。また、インキ収容管の端面の形状に歪みが生じることを抑制することもできる。このため、インキ収容管にボールペンチップやジョイントなどの部材を嵌合させる際、その作業を容易に行うことができる。また、インキ収容管の端部に亀裂を生じにくくさせることも可能となる。 In this case, it is possible for the ink containing tube to have an appropriate bending strength. Moreover, it is possible to suppress the occurrence of distortion in the shape of the end surface of the ink storage tube. Therefore, when a member such as a ballpoint pen tip or a joint is fitted to the ink storage tube, the work can be easily performed. It is also possible to make cracks less likely to occur at the end of the ink storage tube.
　上記筆記具用インキ収容管においては、バイオマス材料の水蒸気透過度が４０℃、９０％ＲＨの条件下において２５ｇ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下であり、酸素透過度が、２０℃、９０％ＲＨの条件下において２００００ｍＬ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下であることが好ましい。 In the ink storage tube for a writing instrument, the biomass material has a water vapor permeability of 25 g/m 2 ·atm 24 hr/25 μm or less under conditions of 40 ° C. and 90% RH, and an oxygen permeability of 20 ° C. and 90%. It is preferably 20000 mL/m 2 ·atm·24 hr/25 µm or less under RH conditions.
　この場合、水蒸気及び酸素がインキ収容管を透過しにくくなる。このため、インキ収容管にインキを収容しても、水蒸気及び酸素がインキ収容管を透過してインキに混入することや、インキ中の溶媒が揮発することが抑制される。このため、インキの変質を抑制することができる。 In this case, it becomes difficult for water vapor and oxygen to permeate the ink storage tube. Therefore, even if the ink is stored in the ink storage tube, it is possible to prevent water vapor and oxygen from permeating the ink storage tube and mixing with the ink, and volatilization of the solvent in the ink. Therefore, deterioration of the ink can be suppressed.
　また、本発明は、上述した筆記具用インキ収容管と、前記筆記具用インキ収容管に収容されるインキとを備える筆記具用中芯である。 Further, the present invention is a core for a writing instrument comprising the ink storage tube for a writing instrument described above and ink stored in the ink storage tube for the writing instrument.
　この筆記具用中芯によれば、インキ収容管が、石油由来プラスチックの使用量を低減しつつ、ポリ乳酸樹脂などの生分解性樹脂と比較して、中芯の保存安定性を向上させることができる。このため、本発明の中芯は、筆記具に使用した場合に、長期間にわたって筆記具を使用し続けることができる。また、本発明の中芯によれば、インキ収容管の吸湿による崩壊や白濁を抑制できるため、筆記具に使用した場合において、必要に応じて中芯を取り出してインキ残量を確認する場合でも、インキ残量が視認しにくくなることが抑制される。 According to this core for writing instruments, the ink storage tube can reduce the amount of petroleum-derived plastic used and improve the storage stability of the core compared to biodegradable resins such as polylactic acid resin. can. Therefore, when the core of the present invention is used in a writing instrument, the writing instrument can be used continuously for a long period of time. In addition, according to the core of the present invention, it is possible to suppress collapse and cloudiness due to moisture absorption of the ink storage tube. It is possible to prevent the remaining amount of ink from becoming difficult to visually recognize.
　また、本発明は、上述した筆記具用中芯を有する筆記具である。 The present invention also provides a writing instrument having the core for a writing instrument described above.
　本発明の筆記具によれば、中芯が、石油由来プラスチックの使用量を低減しつつ、ポリ乳酸樹脂などの生分解性樹脂と比較して、中芯の保存安定性を向上させることができるため、長期間にわたって使用し続けることができる。また、本発明の筆記具によれば、インキ収容管の吸湿による崩壊や白濁を抑制できるため、必要に応じて中芯を取り出してインキ残量を確認する場合でも、インキ残量が視認しにくくなることが抑制される。 According to the writing instrument of the present invention, the core can improve the storage stability of the core compared to biodegradable resins such as polylactic acid resin while reducing the amount of petroleum-derived plastic used. , can be used for a long time. In addition, according to the writing instrument of the present invention, collapse and cloudiness due to moisture absorption of the ink storage tube can be suppressed, so even when the core is taken out to check the remaining ink amount as necessary, the remaining ink amount becomes difficult to visually recognize. is suppressed.
　本発明によれば、石油由来プラスチックの使用量を低減しつつ、ポリ乳酸樹脂などの生分解性樹脂と比較して、中芯の保存安定性を向上させることができる筆記具用インキ収容管、筆記具用中芯及び筆記具を提供することができる。 ADVANTAGE OF THE INVENTION According to the present invention, an ink storage tube for a writing instrument and a writing instrument that can improve the storage stability of the core compared to biodegradable resin such as polylactic acid resin while reducing the amount of petroleum-derived plastic used. A writing medium and a writing instrument can be provided.
本発明の筆記具の一実施形態であるボールペンを示す模式断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic cross section which shows the ball-point pen which is one Embodiment of the writing instrument of this invention.
　以下、場合により図面を参照して、本発明の好適な実施形態について説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings as the case may be.
　本実施形態の筆記具用インキ収容管は、樹脂を含む筆記具用インキ収容管であって、上記樹脂がバイオマス材料を含み、このバイオマス材料がポリオレフィン樹脂であるものである。 The ink storage tube for a writing instrument of this embodiment is an ink storage tube for a writing instrument containing a resin, the resin containing a biomass material, and the biomass material being a polyolefin resin.
　この筆記具用インキ収容管によれば、樹脂がバイオマス材料を含むことで、石油由来プラスチックの使用量を低減することができる。また、バイオマス材料がポリオレフィン樹脂であり、ポリオレフィン樹脂は、ポリ乳酸樹脂などの生分解性樹脂と比較して吸湿しにくく膨潤しにくい。さらにポリオレフィン樹脂は生分解性を有さないため、ポリ乳酸樹脂などの生分解性樹脂と比較して劣化もしにくい。このため、インキ収容管にインキを収容させても、インキからインキ収容管を通して溶媒が減少することが抑制される。すなわち、本発明のインキ収容管は、ポリ乳酸樹脂などの生分解性樹脂と比較して、中芯の保存安定性を向上させることができる。このため、インキ収容管を、インキを収容して筆記具に使用した場合に、筆記具を長期間にわたって使用することができる。また、バイオマス材料が、ポリ乳酸樹脂などの生分解性樹脂と比較して吸湿しにくいポリオレフィン樹脂であるため、吸湿によりインキ収容管が崩壊することや白濁することをより抑制することができる。このため、インキ収容管内のインキ残量が視認しにくくなることが抑制される。 According to this ink storage tube for writing instruments, the amount of petroleum-derived plastics used can be reduced by including a biomass material in the resin. Moreover, the biomass material is a polyolefin resin, and the polyolefin resin is less likely to absorb moisture and swell compared to biodegradable resins such as polylactic acid resin. Furthermore, since polyolefin resins are not biodegradable, they are less likely to deteriorate than biodegradable resins such as polylactic acid resins. Therefore, even if the ink is stored in the ink storage tube, the decrease of the solvent from the ink through the ink storage tube is suppressed. That is, the ink storage tube of the present invention can improve the storage stability of the core as compared with biodegradable resin such as polylactic acid resin. Therefore, when the ink storage tube stores ink and is used in a writing instrument, the writing instrument can be used for a long period of time. In addition, since the biomass material is a polyolefin resin that absorbs less moisture than a biodegradable resin such as polylactic acid resin, it is possible to further suppress collapse and clouding of the ink storage tube due to moisture absorption. Therefore, it is possible to prevent the amount of ink remaining in the ink containing tube from becoming difficult to visually recognize.
　以下、本実施形態の筆記具用インキ収容管（以下、単に「インキ収容管」という。）について説明する。 The ink storage tube for writing instruments (hereinafter simply referred to as "ink storage tube") of the present embodiment will be described below.
　樹脂は、バイオマス材料を含む。このバイオマス材料は、ポリオレフィン樹脂である。ここで、バイオマス材料であるポリオレフィン樹脂は、植物由来のモノマーを含む原料を用いて得られるものであればよく、原料は、植物由来のモノマーのみを含む原料であっても、植物由来のモノマー及び動物由来のモノマーを含む原料であってもよい。上記モノマーとしては、例えばエチレン、プロピレンなどのオレフィンが挙げられる。 "Resins include biomass materials." This biomass material is a polyolefin resin. Here, the polyolefin resin, which is a biomass material, may be obtained using a raw material containing a plant-derived monomer, and the raw material may be a raw material containing only a plant-derived monomer. Raw materials containing animal-derived monomers may also be used. Examples of the monomer include olefins such as ethylene and propylene.
　ポリオレフィン樹脂としては、ポリエチレン樹脂、ポリプロピレン樹脂、エチレン酢酸ビニル共重合体、ポリメチルペンテン樹脂などが挙げられる。これらはそれぞれ単独で又は２種以上を混合して使用してもよい。 Polyolefin resins include polyethylene resins, polypropylene resins, ethylene-vinyl acetate copolymers, and polymethylpentene resins. These may be used alone or in combination of two or more.
　樹脂は、さらに非バイオマス材料を含んでもよい。 The resin may further contain non-biomass materials.
　非バイオマス材料としては、ポリエチレン樹脂、ポリプロピレン樹脂、エチレン酢酸ビニル共重合体、ポリメチルペンテン樹脂などのポリオレフィン樹脂が挙げられる。この場合、非バイオマス材料もポリオレフィン樹脂であり、ポリオレフィン樹脂は、吸湿しにくく、ポリ乳酸樹脂などの生分解性樹脂と比較して劣化もしにくい。このため、インキ収容管は、中芯の保存安定性をより向上させる傾向がある。また、バイオマス材料も非バイオマス材料もポリオレフィン樹脂であるため、インキ収容管の透明性をより向上させることができる。このため、インキ収容管にインキを収容させると、インキ残量を容易に視認することが可能となる。さらに、バイオマス材料も非バイオマス材料も、ポリ乳酸樹脂などの生分解性樹脂と比較して吸湿しにくいポリオレフィン樹脂であるため、吸湿によりインキ収容管が崩壊することや白濁することをより抑制することができる。このため、インキ収容管内のインキ残量が視認しにくくなることがより抑制される。 Non-biomass materials include polyolefin resins such as polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, and polymethylpentene resin. In this case, the non-biomass material is also polyolefin resin, and polyolefin resin is less likely to absorb moisture and is less likely to deteriorate compared to biodegradable resin such as polylactic acid resin. Therefore, the ink storage tube tends to further improve the storage stability of the core. Moreover, since both the biomass material and the non-biomass material are polyolefin resins, the transparency of the ink storage tube can be further improved. Therefore, when ink is stored in the ink storage tube, it is possible to easily visually recognize the remaining amount of ink. Furthermore, since both the biomass material and the non-biomass material are polyolefin resins that absorb less moisture than biodegradable resins such as polylactic acid resin, collapse of the ink storage tube and clouding due to moisture absorption can be further suppressed. can be done. For this reason, it is further suppressed that the amount of ink remaining in the ink containing tube becomes difficult to visually recognize.
　樹脂中のバイオマス材料の含有率は０質量％より大きければ特に制限されず、１００質量％でもよいが、８０質量％以下であることが好ましい。樹脂中のバイオマス材料の含有率が８０質量％以下である場合、インキ収容管は、中芯の保存安定性をより向上させる傾向がある。 The content of biomass material in the resin is not particularly limited as long as it is greater than 0% by mass, and may be 100% by mass, but is preferably 80% by mass or less. When the content of the biomass material in the resin is 80% by mass or less, the ink storage tube tends to further improve the storage stability of the core.
　樹脂中のバイオマス材料の含有率はより好ましくは６０質量％以下である。但し、石油由来のプラスチックの使用量をより低減する観点からは、２５質量％以上であることが好ましい。 The content of biomass material in the resin is more preferably 60% by mass or less. However, from the viewpoint of further reducing the amount of petroleum-derived plastic used, it is preferably 25% by mass or more.
　樹脂がバイオマス材料と非バイオマス材料からなる場合、非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、バイオマス材料を構成するポリオレフィン樹脂がポリエチレン樹脂であることが好ましい。 When the resin is composed of a biomass material and a non-biomass material, it is preferable that the polyolefin resin that constitutes the non-biomass material is a polypropylene resin, and the polyolefin resin that constitutes the biomass material is a polyethylene resin.
　この場合、インキ収容管が適度な曲げ強度を有することが可能となる。また、インキ収容管の端面の形状に歪みが生じることを抑制することもできる。このため、インキ収容管にチップやジョイントなどの部材を嵌合させる際、その作業を容易に行うことができる。また、インキ収容管の端部に亀裂を生じにくくさせることも可能となる。 In this case, it is possible for the ink containing tube to have an appropriate bending strength. Moreover, it is possible to suppress the occurrence of distortion in the shape of the end surface of the ink storage tube. Therefore, when a member such as a tip or a joint is fitted to the ink containing tube, the work can be easily performed. It is also possible to make cracks less likely to occur at the end of the ink storage tube.
　ここで、ポリプロピレン樹脂としては、ホモポリプロピレン樹脂でも、プロピレン樹脂と他のモノマーとの共重合体でもよいが、ホモポリプロピレン樹脂であることが好ましい。この場合、インキ収容管が、高結晶性による高い剛性、高い光沢性及び高い耐熱性を有することが可能となる。 Here, the polypropylene resin may be a homopolypropylene resin or a copolymer of a propylene resin and another monomer, but is preferably a homopolypropylene resin. In this case, the ink storage tube can have high rigidity, high glossiness, and high heat resistance due to high crystallinity.
　また、ポリエチレン樹脂としては、低密度ポリエチレン樹脂、直鎖状低密度ポリエチレン樹脂、高密度ポリエチレン樹脂が挙げられる。中でも、ポリエチレン樹脂は高密度ポリエチレン樹脂であることが好ましい。この場合、ポリエチレン樹脂が高密度ポリエチレン樹脂以外のポリエチレン樹脂である場合に比べて、インキ収容管がインキ中の溶媒を透過させにくくなる。このため、インキ収容管が中芯の保存安定性をより向上させることができる。また、ポリエチレン樹脂が高密度ポリエチレン樹脂であると、ポリエチレン樹脂の融点が高くなり、ポリプロピレン樹脂の融点に近づく。このため、筆記具が高温環境下に置かれても、インキ収容管が変形しにくくなる。
　樹脂がバイオマス材料と非バイオマス材料からなる場合、非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であってもよい。
　この場合、バイオマス材料及び非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、相溶性が良好であるため、インキ収容管の均質性を向上させることができる。また、バイオマス材料及び非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であるため、インキ収容管の機械的特性を向上させることができる。
　樹脂は、バイオマス材料のみで構成されてもよい。すなわち、筆記具用インキ収容管においては、樹脂中のバイオマス材料の含有率が１００質量％であってもよい。
　ここで、バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であってもよい。この場合、樹脂中のバイオマス材料の含有率が１００質量％であるため、インキ収容管の均質性を向上させることができる。また、バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であるため、インキ収容管の機械的特性を向上させることができる。 Moreover, polyethylene resins include low-density polyethylene resins, linear low-density polyethylene resins, and high-density polyethylene resins. Among them, the polyethylene resin is preferably a high-density polyethylene resin. In this case, compared to the case where the polyethylene resin is a polyethylene resin other than the high-density polyethylene resin, the ink storage tube becomes more difficult to permeate the solvent in the ink. Therefore, the ink storage tube can further improve the storage stability of the core. Further, when the polyethylene resin is a high-density polyethylene resin, the melting point of the polyethylene resin becomes high and approaches the melting point of the polypropylene resin. Therefore, even if the writing instrument is placed in a high-temperature environment, the ink reservoir tube is less likely to deform.
When the resin is composed of a biomass material and a non-biomass material, the polyolefin resin that constitutes the non-biomass material may be a polypropylene resin, and the polyolefin resin that constitutes the biomass material may be a polypropylene resin.
In this case, the polyolefin resin that constitutes the biomass material and the non-biomass material is a polypropylene resin and has good compatibility, so that the homogeneity of the ink storage tube can be improved. Moreover, since the polyolefin resin constituting the biomass material and the non-biomass material is polypropylene resin, the mechanical properties of the ink storage tube can be improved.
The resin may consist only of biomass material. That is, in the ink storage tube for writing instruments, the content of the biomass material in the resin may be 100% by mass.
Here, the polyolefin resin constituting the biomass material may be a polypropylene resin. In this case, since the content of the biomass material in the resin is 100% by mass, it is possible to improve the homogeneity of the ink storage tube. Moreover, since the polyolefin resin constituting the biomass material is polypropylene resin, the mechanical properties of the ink storage tube can be improved.
　樹脂がバイオマス材料と非バイオマス材料からなる場合、非バイオマス材料のＭＦＲ（Ａ１）に対するバイオマス材料のＭＦＲ（Ａ２）の比Ｒ（＝Ａ２／Ａ１）の値は特に制されるものではないが、Ｒは好ましくは０．１～１０であり、より好ましくは０．２～５である。Ｒが上記範囲内にあることで、インキ収容管の外観をより良好なものとすることができる。 When the resin consists of a biomass material and a non-biomass material, the ratio R (=A2/A1) of the MFR (A2) of the biomass material to the MFR (A1) of the non-biomass material is not particularly limited, but R is preferably 0.1-10, more preferably 0.2-5. When R is within the above range, the appearance of the ink reservoir tube can be improved.
　バイオマス材料の曲げ弾性率は特に制限されるものではないが、１００～２１００ＭＰａであることが好ましい。この場合、インキ収容管が適度な曲げ強度を有することが可能となる。また、インキ収容管の端面の形状に歪みが生じることを抑制することもできる。このため、インキ収容管にボールペンチップやジョイントなどの部材を嵌合させる際、その作業を容易に行うことができる。また、インキ収容管の端部に亀裂を生じにくくさせることも可能となる。 Although the flexural modulus of the biomass material is not particularly limited, it is preferably 100 to 2100 MPa. In this case, it becomes possible for the ink containing tube to have an appropriate bending strength. Moreover, it is possible to suppress the occurrence of distortion in the shape of the end surface of the ink storage tube. Therefore, when a member such as a ballpoint pen tip or a joint is fitted to the ink storage tube, the work can be easily performed. It is also possible to make cracks less likely to occur at the end of the ink storage tube.
　バイオマス材料の曲げ弾性率はより好ましくは５００～１８００ＭＰａであり、特に好ましくは８００～１５００ＭＰａである。 The flexural modulus of the biomass material is more preferably 500-1800 MPa, particularly preferably 800-1500 MPa.
　バイオマス材料の水蒸気透過度及び酸素透過度は特に制限されるものではないが、水蒸気透過度が４０℃、９０％ＲＨの条件下において２５ｇ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下であり、酸素透過度が、２０℃、９０％ＲＨの条件下において２００００ｍＬ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下であることが好ましい。 Although the water vapor permeability and oxygen permeability of the biomass material are not particularly limited, the water vapor permeability is 25 g / m 2 · atm · 24 hr / 25 μm or less under the conditions of 40 ° C. and 90% RH, and oxygen permeability The degree is preferably 20000 mL/m 2 ·atm·24 hr/25 µm or less under the conditions of 20°C and 90% RH.
　この場合、水蒸気及び酸素がインキ収容管を透過しにくくなる。このため、インキ収容管にインキを収容しても、水蒸気及び酸素がインキ収容管を透過してインキに混入することやインキ中の溶媒が揮発することが抑制される。このため、インキの変質を抑制することができる。 In this case, it becomes difficult for water vapor and oxygen to permeate the ink storage tube. Therefore, even if the ink is stored in the ink storage tube, it is possible to prevent water vapor and oxygen from permeating the ink storage tube and mixing with the ink, and volatilization of the solvent in the ink. Therefore, deterioration of the ink can be suppressed.
　水蒸気透過度はより好ましくは２０ｇ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下であり、特に好ましくは１６ｇ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下である。 The water vapor permeability is more preferably 20 g/m 2 ·atm·24 hr/25 μm or less, and particularly preferably 16 g/m 2 ·atm 24 hr/25 μm or less.
　酸素透過度は、より好ましくは１５０００ｍＬ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下であり、特に好ましくは１３０００ｍＬ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下である。 The oxygen permeability is more preferably 15000 mL/m 2 ·atm·24 hr/25 μm or less, and particularly preferably 13000 mL/m 2 ·atm 24 hr/25 μm or less.
　インキ収容管の形状は管状であれば特に制限されないが、通常は円筒状である。 The shape of the ink storage tube is not particularly limited as long as it is tubular, but it is usually cylindrical.
　インキ収容管は、単層で構成されても多層で構成されてもよい。 The ink storage tube may be composed of a single layer or multiple layers.
　インキ収容管は、樹脂以外に、必要に応じてさらに添加剤を含んでいてもよい。
　添加剤としては、例えば表面平滑剤、相溶化剤、着色剤が挙げられる。 The ink storage tube may contain additives other than the resin, if necessary.
Additives include, for example, surface smoothing agents, compatibilizers, and colorants.
　次に、上述のインキ収容管を用いた筆記具の好適な実施形態について説明する。 Next, a preferred embodiment of a writing instrument using the above-described ink containing tube will be described.
　図１は、本発明の筆記具の一実施形態であるボールペンを示す模式断面図である。図１に示すボールペン１００は、両端が開口している本体管１８と、本体管１８に装着される筆記具用中芯（以下、単に「中芯」という）１０と、本体管１８の一端に固定される尾栓２８とを備えている。 FIG. 1 is a schematic cross-sectional view showing a ballpoint pen that is one embodiment of the writing instrument of the present invention. A ball-point pen 100 shown in FIG. and a tail plug 28 that is attached.
　中芯１０は、インキ収容管１４と、インキ収容管１４の先端側に設けられるボールペンチップ２０と、インキ収容管１４の先端にボールペンチップ２０を固定させるジョイント２２と、インキ収容管１４内に収容されるインキ１２と、インキ収容管１４内に配置され、インキ１２の逆流を防止する逆流防止体１６とを備えている。 The core 10 is housed in the ink containing tube 14, the ballpoint pen tip 20 provided on the tip side of the ink containing tube 14, the joint 22 for fixing the ballpoint pen tip 20 to the tip of the ink containing tube 14, and the ink containing tube 14. and a backflow preventing member 16 arranged in the ink containing tube 14 to prevent backflow of the ink 12. - 特許庁
　ボールペンチップ２０は、ボールホルダー２４及びボール２６で構成されている。逆流防止体１６は、インキ収容管１４内で、インキ１２のボールペンチップ２０側と反対側にインキ１２と隣接した状態で収容されている。逆流防止体１６は、インキ１２との間に隙間が生じないように配置される。 The ballpoint pen tip 20 is composed of a ball holder 24 and a ball 26. The backflow preventer 16 is housed in the ink housing tube 14 adjacent to the ink 12 on the opposite side of the ink 12 from the ballpoint pen tip 20 side. The anti-backflow element 16 is arranged so as not to create a gap between itself and the ink 12 .
　中芯１０のボールペンチップ２０は本体管１８の先端から突出しており、中芯１０のインキ収容管１４の後端部は尾栓２８と当接している。尾栓２８は、通気孔を有しており、この通気孔がインキ収容管内の空間と連通している。 The ballpoint pen tip 20 of the core 10 protrudes from the tip of the main body tube 18, and the rear end of the ink storage tube 14 of the core 10 abuts the tail plug 28. The tail plug 28 has a vent, and this vent communicates with the space inside the ink reservoir tube.
　以下、ボールペン１００の構成要素について説明するが、インキ収容管１４以外の構成には、ボールペンに用いられる一般的な構成を適用することができる。 The constituent elements of the ballpoint pen 100 will be described below, but the general configuration used for ballpoint pens can be applied to the configuration other than the ink storage tube 14 .
　インキ１２は、溶媒及び着色剤を含むものであればよく、水性インキでも油性インキでもよい。着色剤としては、顔料及び染料が挙げられる。これらはそれぞれ単独で又は２種以上を混合して用いることができる。 The ink 12 may contain a solvent and a coloring agent, and may be water-based ink or oil-based ink. Colorants include pigments and dyes. These can be used individually or in mixture of 2 or more types, respectively.
　逆流防止体１６は、インキを流出させない機能（流出防止性）や、インキをドライアップさせない機能（密栓性）等を有するものであり、こうした機能を有する公知の逆流防止体を特に制限なく使用することができる。かかる逆流防止体１６は、例えば、基油と増稠剤とを含んで構成されている。基油としては、鉱油、ポリブテン、シリコン油、グリセリン、ポリアルキレングリコール等が挙げられる。また、増稠剤としては、金属石鹸系増稠剤、有機系増稠剤、無機系増稠剤等が挙げられる。 The backflow prevention member 16 has a function of preventing ink from flowing out (outflow prevention property) and a function of preventing ink from drying up (sealing property). be able to. Such a backflow preventer 16 includes, for example, a base oil and a thickening agent. Base oils include mineral oil, polybutene, silicon oil, glycerin, polyalkylene glycol, and the like. Further, examples of thickening agents include metallic soap thickeners, organic thickeners, inorganic thickeners, and the like.
　本体管１８及び尾栓２８としては、例えば、ポリプロピレン樹脂等のプラスチック材料からなるものを使用することができる。 As the main tube 18 and the tail plug 28, for example, those made of a plastic material such as polypropylene resin can be used.
　ジョイント２２としては、例えば、ポリプロピレン樹脂、ポリエチレン樹脂、ポリエチレンテレフタレート樹脂、ナイロン樹脂、ポリアセタール樹脂、ポリカーボネート樹脂、ポリブチレンテレフタレート樹脂等からなるものを使用することができる。 For example, the joint 22 can be made of polypropylene resin, polyethylene resin, polyethylene terephthalate resin, nylon resin, polyacetal resin, polycarbonate resin, polybutylene terephthalate resin, or the like.
　ボールペンチップ２０におけるジョイント２２、ボールホルダー２４及びボール２６としては、通常のボールペンに用いられているものを使用することができる。また、ボール２６の直径は０．２～１．６ｍｍであることが好ましい。 As the joint 22, the ball holder 24 and the ball 26 in the ball-point pen tip 20, those used in ordinary ball-point pens can be used. Also, the diameter of the ball 26 is preferably 0.2 to 1.6 mm.
　本実施形態の中芯１０は、インキ収容管１４が、石油由来プラスチックの使用量を低減しつつ、ポリ乳酸樹脂などの生分解性樹脂と比較して、中芯１０の保存安定性を向上させることができる。このため、中芯１０は、ボールペン１００に使用した場合に、長期間にわたってボールペン１００を使用し続けることができる。また、中芯１０によれば、インキ収容管１４の吸湿による崩壊や白濁を抑制できるため、ボールペン１００に使用した場合において、必要に応じて中芯１０を取り出してインキ残量を確認する場合でも、インキ残量が視認しにくくなることが抑制される。 In the core 10 of the present embodiment, the ink storage tube 14 reduces the amount of petroleum-derived plastic used and improves the storage stability of the core 10 compared to biodegradable resins such as polylactic acid resin. be able to. Therefore, when the core 10 is used in the ball-point pen 100, the ball-point pen 100 can be used continuously for a long period of time. Further, according to the core 10, collapse and cloudiness due to moisture absorption of the ink storage tube 14 can be suppressed. , it is suppressed that the remaining amount of ink becomes difficult to visually recognize.
　本実施形態のボールペン１００は、上述の特徴を有する中芯１０を用いているため、ボールペン１００は、長期間にわたって使用し続けることができる。また、ボールペン１００によれば、インキ収容管１４の吸湿による崩壊や白濁を抑制できるため、必要に応じて中芯１０を取り出してインキ残量を確認する場合でも、インキ残量が視認しにくくなることが抑制される。 Since the ball-point pen 100 of this embodiment uses the core 10 having the features described above, the ball-point pen 100 can be used continuously for a long period of time. Further, according to the ball-point pen 100, collapse and cloudiness due to moisture absorption of the ink storage tube 14 can be suppressed, so even when the core 10 is taken out to check the remaining ink amount as necessary, the remaining ink amount becomes difficult to visually recognize. is suppressed.
　以上、本発明の筆記具の好適な実施形態についてボールペンを例に挙げて説明したが、ボールペンは上記実施形態に限定されるものではない。例えば、本実施形態のボールペンは、本体管１８を有していなくてもよく、インキ収容管１４がそのまま本体管となっていてもよい。更に、本実施形態に係るボールペンは、インキ収容管１４中のインキ１２及び逆流防止体１６が後端（ボールペンチップ２０と反対側の一端）側から加圧された状態となるような加圧機構を有するものであってもよい。また、本実施形態に係るボールペンは、逆流防止体１６を有していなくてもよい。 Although the preferred embodiment of the writing instrument of the present invention has been described above using a ballpoint pen as an example, the ballpoint pen is not limited to the above embodiment. For example, the ball-point pen of this embodiment may not have the main tube 18, and the ink storage tube 14 may be the main tube as it is. Furthermore, the ball-point pen according to the present embodiment has a pressurizing mechanism that presses the ink 12 and the backflow prevention member 16 in the ink containing tube 14 from the rear end (one end on the side opposite to the ball-point pen tip 20). may have Also, the ball-point pen according to the present embodiment may not have the backflow prevention member 16 .
　また、本発明の筆記具は、ボールペンに限定されるものではなく、例えば筆ペンを含むマーキングペン類、又はインキ排出部に弁機構を用いた筆記具であってもよい。また本発明のインキ収容管は、マーキングペン用インキ吸蔵体の外皮のように使用されてもよい。 In addition, the writing instrument of the present invention is not limited to a ballpoint pen, and may be, for example, a marking pen including a calligraphy pen, or a writing instrument using a valve mechanism in the ink discharge part. Also, the ink storage tube of the present invention may be used like the outer skin of the ink occlusion body for a marking pen.
　なお、本発明の概要は以下のとおりである。
［１］樹脂を含む筆記具用インキ収容管であって、前記樹脂がバイオマス材料を含み、前記バイオマス材料がポリオレフィン樹脂である筆記具用インキ収容管。
［２］前記バイオマス材料の含有率が８０質量％以下である、［１］に記載の筆記具用インキ収容管。
［３］前記樹脂が、非バイオマス材料をさらに含み、前記非バイオマス材料が、ポリオレフィン樹脂である、［１］又は[２]に記載の筆記具用インキ収容管。
［４］前記非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、前記バイオマス材料を構成するポリオレフィン樹脂がポリエチレン樹脂である、［３］に記載の筆記具用インキ収容管。
［５］前記ポリエチレン樹脂が高密度ポリエチレンである、［４］に記載の筆記具用インキ収容管。
［６］前記非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、前記バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂である、［３］に記載の筆記具用インキ収容管。
［７］前記樹脂中のバイオマス材料の含有率が１００質量％であり、前記バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂である、［１］に記載の筆記具用インキ収容管。
［８］前記バイオマス材料の曲げ弾性率が１００～２１００ＭＰａである、［１］～[７]のいずれかに記載の筆記具用インキ収容管。
［９］前記バイオマス材料の水蒸気透過度が４０℃、９０％ＲＨの条件下において２５ｇ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下であり、酸素透過度が、２０℃、９０％ＲＨの条件下において２００００ｍＬ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下である、［１］～[８]のいずれかに記載の筆記具用インキ収容管。
［１０］［１］～［９］のいずれかに記載の筆記具用インキ収容管と、前記筆記具用インキ収容管に収容されるインキとを備える、筆記具用中芯。
［１１］［１０］に記載の筆記具用中芯を有する筆記具。 The outline of the present invention is as follows.
[1] An ink storage tube for a writing instrument containing a resin, wherein the resin contains a biomass material, and the biomass material is a polyolefin resin.
[2] The ink storage tube for a writing instrument according to [1], wherein the content of the biomass material is 80% by mass or less.
[3] The ink container for a writing instrument according to [1] or [2], wherein the resin further contains a non-biomass material, and the non-biomass material is a polyolefin resin.
[4] The ink storage tube for a writing instrument according to [3], wherein the polyolefin resin constituting the non-biomass material is polypropylene resin, and the polyolefin resin constituting the biomass material is polyethylene resin.
[5] The ink container for writing instruments according to [4], wherein the polyethylene resin is high-density polyethylene.
[6] The ink storage tube for a writing instrument according to [3], wherein the polyolefin resin constituting the non-biomass material is polypropylene resin, and the polyolefin resin constituting the biomass material is polypropylene resin.
[7] The ink storage tube for a writing instrument according to [1], wherein the content of the biomass material in the resin is 100% by mass, and the polyolefin resin constituting the biomass material is a polypropylene resin.
[8] The ink storage tube for a writing instrument according to any one of [1] to [7], wherein the biomass material has a flexural modulus of 100 to 2100 MPa.
[9] The water vapor permeability of the biomass material is 25 g/m 2 · atm 24 hr/25 μm or less under the conditions of 40 ° C. and 90% RH, and the oxygen permeability is 20 ° C. and 90% RH. The ink reservoir for writing instruments according to any one of [1] to [8], which is 20000 mL/m 2 ·atm · 24hr/25μm or less.
[10] A core for a writing instrument, comprising the ink storage tube for a writing instrument according to any one of [1] to [9], and ink stored in the ink storage tube for the writing instrument.
[11] A writing instrument having the core for a writing instrument according to [10].
　以下、実施例及び比較例に基づいて本発明をより具体的に説明するが、本発明は以下の実施例に限定されるものではない。 The present invention will be described in more detail below based on examples and comparative examples, but the present invention is not limited to the following examples.
（実施例１～７及び比較例１～２）
　実施例１～７及び比較例１～２の各々について、下記表１に示す非バイオマス材料及びバイオマス材料を用意し、同表に示す配合量（質量部）で混練した後、円筒状に押し出し、押出物を、長さ９ｃｍとなるように切断した。こうして、長さ９ｃｍ、厚さ０．７ｍｍ、内径２．５ｍｍのインキ収容管を作製した。 (Examples 1-7 and Comparative Examples 1-2)
For each of Examples 1 to 7 and Comparative Examples 1 and 2, the non-biomass materials and biomass materials shown in Table 1 below were prepared, kneaded in the blending amounts (parts by mass) shown in the table, and then extruded into a cylindrical shape. The extrudate was cut to a length of 9 cm. In this way, an ink storage tube having a length of 9 cm, a thickness of 0.7 mm and an inner diameter of 2.5 mm was produced.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　上記表１において、使用した材料は以下のとおりである。
＜非バイオマス材料＞
石油由来ＰＰ：石油由来ポリプロピレン樹脂（「サンアロマー（登録商標）ＰＬ４００Ａ」、サンアロマー株式会社製）
＜バイオマス材料＞
・植物由来ＨＤＰＥ：植物由来高密度ポリエチレン樹脂（「ＳＧＥ７２５２」、ブラスケム社製）
・植物由来ＬＬＤＰＥ：植物由来直鎖状低密度ポリエチレン樹脂（「ＳＬＨ２１８」、ブラスケム社製）
・植物由来ＰＰ：植物由来ポリプロピレン樹脂（「ＨＣ１０１ＢＦ」、ボレアリス社製）
・生分解性樹脂：ポリ乳酸樹脂（「ラクリエ（登録商標）ＦＣ０４２９」、富士ケミカル株式会社製）
・植物由来ＰＣ：植物由来ポリカーボネート樹脂（「ＤＵＲＡＢＩＯ Ｄ５３８０Ｒ」、三菱ケミカル社製） In Table 1 above, the materials used are as follows.
<Non-biomass materials>
Petroleum-derived PP: Petroleum-derived polypropylene resin (“SunAllomer (registered trademark) PL400A”, manufactured by SunAllomer Co., Ltd.)
<Biomass materials>
・ Plant-derived HDPE: Plant-derived high-density polyethylene resin ("SGE7252", manufactured by Braskem)
・ Plant-derived LLDPE: plant-derived linear low-density polyethylene resin (“SLH218”, manufactured by Braskem)
・ Plant-derived PP: Plant-derived polypropylene resin (“HC101BF”, manufactured by Borealis)
・ Biodegradable resin: Polylactic acid resin (“Lakurie (registered trademark) FC0429”, manufactured by Fuji Chemical Co., Ltd.)
・Plant-derived PC: Plant-derived polycarbonate resin ("DURABIO D5380R", manufactured by Mitsubishi Chemical Corporation)
　上記のようにして得られたインキ収容管について、以下のようにして中芯保存安定性、インキ収容管安定性、透明性及び外観を評価した。 For the ink storage tube obtained as described above, core storage stability, ink storage tube stability, transparency and appearance were evaluated as follows.
［中芯保存安定性の評価］
　まず、実施例１～７及び比較例１～２で得られたインキ収容管を用いて以下のようにして中芯を作製した。
　すなわち、はじめに、インキ収容管の一端に、ポリプロピレン樹脂からなるジョイントを嵌合させ、ジョイントの先端にボールペンチップ（ボール径：０．７ｍｍ）を取り付けた。
　そして、インキをインキ収容管に注入して収容した。
　続いて、インキ収容管内のボールペンチップとは反対側（インキの後端面側）に、上記インキと隣接するように、精製鉱油９５質量％と増稠剤（金属石鹸、エラストマー）５質量％とからなる逆流防止体を充填した。こうして中芯を得た。
　こうして得られた中芯について、インキ充填量（ｍ２）ｇを含めた初期重量（ｍ０）ｇを測定した後、５０℃、０％ＲＨの環境下に３か月間放置する保存試験を行い、再度、重量（ｍ１）ｇを測定し、下記式に基づいて中芯の重量変化率（％）を算出した。結果を表１に示す。
 
中芯の重量変化率（％）＝１００×（ｍ０－ｍ１）／ｍ２
 
　なお、中芯の重量変化は、インキ中の溶媒が揮発してインキ収容管を透過して排出されることで生じるものであり、中芯保存安定性の指標となるものである。
　また、下記評価基準に基づいて中芯保存安定性の評価を行った。結果を表１に示す。
 
＜中芯保存安定性の評価基準＞
◎：中芯の重量変化率が１０％以下である
〇：中芯の重量変化率が１０％より大きく１５％以下である
×：中芯の重量変化率が１５％より大きい
 
　比較例１については、保存試験中に崩壊したため、中芯の重量変化率を測定することができず、中心保存安定性を評価することもできなかった。そのため、表１において、比較例１の中芯の重量変化率及び中心保存安定性についてはいずれも「－」と表示した。
 
　比較例２については、インキ収容管の一端にジョイントを嵌合させる際に、インキ収容管が割れてしまったため、中芯の重量変化率を測定することができず、中心保存安定性を評価することもできなかった。そのため、表１において、比較例２の中芯の重量変化率及び中心保存安定性についても、いずれも「－」と表示した。
 
　なお、重量変化率が１５％より大きいと、筆記線にかすれや線飛びが生じる傾向があり、重量変化率が１５％以下になると、筆記線にかすれや線飛びが生じにくくなり、滑らかな筆記が可能となる傾向がある。 [Evaluation of Core Storage Stability]
First, using the ink storage tubes obtained in Examples 1 to 7 and Comparative Examples 1 and 2, cores were produced as follows.
That is, first, a joint made of polypropylene resin was fitted to one end of the ink storage tube, and a ball-point pen tip (ball diameter: 0.7 mm) was attached to the tip of the joint.
Then, the ink was poured into the ink storage tube and stored therein.
Subsequently, 95% by mass of refined mineral oil and 5% by mass of a thickening agent (metallic soap, elastomer) are added to the side opposite to the ball-point pen tip in the ink storage tube (the rear end side of the ink) so as to be adjacent to the ink. filled with a backflow preventer. In this way the core was obtained.
After measuring the initial weight (m 0 ) g including the ink filling amount (m 2 ) g of the medium obtained in this way, a storage test was performed by leaving it in an environment of 50° C. and 0% RH for 3 months. Then, the weight (m 1 ) g was measured again, and the weight change rate (%) of the core was calculated based on the following formula. Table 1 shows the results.

Core weight change rate (%) = 100 x (m 0 - m 1 )/m 2

The change in the weight of the core is caused by the volatilization of the solvent in the ink, which passes through the ink storage tube and is discharged, and is an index of the storage stability of the core.
In addition, the core storage stability was evaluated based on the following evaluation criteria. Table 1 shows the results.

<Evaluation Criteria for Core Storage Stability>
◎: The weight change rate of the core is 10% or less ○: The weight change rate of the core is greater than 10% and 15% or less ×: The weight change rate of the core is greater than 15%
As for Comparative Example 1, the weight change rate of the core could not be measured and the storage stability of the center could not be evaluated because the core collapsed during the storage test. Therefore, in Table 1, both the weight change rate and center storage stability of the core of Comparative Example 1 are indicated as "-".

In Comparative Example 2, when the joint was fitted to one end of the ink storage tube, the ink storage tube was broken. I couldn't do it. Therefore, in Table 1, both the weight change rate and center storage stability of the core of Comparative Example 2 are indicated as "-".

If the weight change rate is more than 15%, the writing line tends to be blurred or skipped. tends to be possible.
［インキ収容管安定性の評価（白濁、崩壊）］
　実施例１～７及び比較例１～２で得られたインキ収容管を６０℃、３か月間放置した後の外観を目視にて観察し、以下の基準に基づいてインキ収容管の安定性を評価した。このとき、湿度については、２５％から９５％まで上昇させた後、２５％まで下降させるサイクルを１サイクルとし、このサイクルを繰り返し行った。１サイクルの時間は１６０分とした。結果を表１に示す。
 
＜インキ収容管安定性の評価基準＞
○：放置後にインキ収容管に白濁及び崩壊が見られない
×：放置後にインキ収容管に白濁又は崩壊が見られる
  [Evaluation of ink storage tube stability (white turbidity, collapse)]
After the ink reservoir tubes obtained in Examples 1 to 7 and Comparative Examples 1 and 2 were left at 60° C. for 3 months, the appearance was visually observed, and the stability of the ink reservoir tubes was evaluated based on the following criteria. evaluated. At this time, one cycle was defined as a cycle in which the humidity was increased from 25% to 95% and then decreased to 25%, and this cycle was repeated. The time for one cycle was 160 minutes. Table 1 shows the results.

<Evaluation Criteria for Ink Containing Tube Stability>
○: No white turbidity or collapse was observed in the ink reservoir tube after standing ×: White turbidity or decay was observed in the ink reservoir tube after standing
［透明性の評価］
　まず、実施例１～７及び比較例１～２で得られたインキ収容管を用い、中芯保存安定性の評価の際に作製した中芯と同様にして中芯を作製した。そして、得られた中芯のインキ収容管を目視にて観察し、以下の基準に基づいてインキ収容管の透明性を評価した。結果を表１に示す。
 
＜透明性の評価基準＞
○：インキを視認できる
×：インキを視認できない
  [Evaluation of transparency]
First, using the ink storage tubes obtained in Examples 1 to 7 and Comparative Examples 1 and 2, cores were produced in the same manner as the cores produced when evaluating the storage stability of the cores. Then, the ink containing tube of the obtained core was visually observed, and the transparency of the ink containing tube was evaluated based on the following criteria. Table 1 shows the results.

<Evaluation Criteria for Transparency>
○: Ink can be seen ×: Ink cannot be seen
［外観（表面平滑性、端面平滑性）の評価］
　実施例１～７及び比較例１～２で得られたインキ収容管を目視にて観察し、以下の基準に基づいてインキ収容管の外観を評価した。結果を表１に示す。
 
＜外観の評価基準＞
○：インキ収容管の端面が真円状であり、端面がインキ収容管の長手方向に直交しており、且つ表面が平滑である
×：インキ収容管の端面が真円状でなく歪んでいるか、端面がインキ収容管の長手方向に直交していないか、又は表面が平滑でなく表面に凹凸が見られる
  [Evaluation of Appearance (Surface Smoothness, Edge Smoothness)]
The ink reservoir tubes obtained in Examples 1 to 7 and Comparative Examples 1 and 2 were visually observed, and the appearance of the ink reservoir tubes was evaluated based on the following criteria. Table 1 shows the results.

<Appearance evaluation criteria>
○: The end face of the ink reservoir tube is perfectly circular, the end face is perpendicular to the longitudinal direction of the ink reservoir tube, and the surface is smooth ×: Is the end face of the ink reservoir tube distorted rather than perfectly circular? , The end face is not perpendicular to the longitudinal direction of the ink storage tube, or the surface is not smooth and uneven.
　表１に示す結果より、実施例１～７は、比較例１～２よりも中芯保存安定性を向上させることができることが分かった。
　したがって、本発明のインキ収容管は、石油由来プラスチックの使用量を低減しつつ、ポリ乳酸樹脂などの生分解性樹脂と比較して、中芯保存安定性を向上させることができることが確認された。 From the results shown in Table 1, it was found that Examples 1-7 can improve core storage stability more than Comparative Examples 1-2.
Therefore, it was confirmed that the ink storage tube of the present invention can reduce the amount of petroleum-derived plastic used and improve the storage stability of the core compared to biodegradable resins such as polylactic acid resin. .
　１０…中芯、１２…インキ、１４…インキ収容管、１６…逆流防止体、１８…本体管、２０…ボールペンチップ、２２…ジョイント、２４…ボールホルダー、２６…ボール、２８…尾栓、１００…ボールペン。 DESCRIPTION OF SYMBOLS 10... Core, 12... Ink, 14... Ink storage tube, 16... Backflow preventive body, 18... Body tube, 20... Ball-point pen tip, 22... Joint, 24... Ball holder, 26... Ball, 28... Tail plug, 100 … a ballpoint pen.

Claims (11)

  1. 　樹脂を含む筆記具用インキ収容管であって、前記樹脂がバイオマス材料を含み、前記バイオマス材料がポリオレフィン樹脂である筆記具用インキ収容管。 An ink storage tube for a writing instrument containing a resin, wherein the resin contains a biomass material and the biomass material is a polyolefin resin.
  2. 　前記バイオマス材料の含有率が８０質量％以下である、請求項１に記載の筆記具用インキ収容管。 The ink storage tube for a writing instrument according to claim 1, wherein the biomass material content is 80% by mass or less.
  3. 　前記樹脂が、非バイオマス材料をさらに含み、前記非バイオマス材料が、ポリオレフィン樹脂である、請求項１に記載の筆記具用インキ収容管。 The ink storage tube for a writing instrument according to claim 1, wherein the resin further contains a non-biomass material, and the non-biomass material is a polyolefin resin.
  4. 　前記非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、
    　前記バイオマス材料を構成するポリオレフィン樹脂がポリエチレン樹脂である、請求項３に記載の筆記具用インキ収容管。     The polyolefin resin constituting the non-biomass material is a polypropylene resin,
    4. The ink storage tube for a writing instrument according to claim 3, wherein the polyolefin resin constituting said biomass material is polyethylene resin.
  5. 　前記ポリエチレン樹脂が高密度ポリエチレンである、請求項４に記載の筆記具用インキ収容管。 The ink container for a writing instrument according to claim 4, wherein the polyethylene resin is high-density polyethylene.
  6. 　前記非バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂であり、
    　前記バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂である、請求項３に記載の筆記具用インキ収容管。     The polyolefin resin constituting the non-biomass material is a polypropylene resin,
    4. The ink storage tube for a writing instrument according to claim 3, wherein the polyolefin resin constituting said biomass material is polypropylene resin.
  7. 　前記樹脂中の前記バイオマス材料の含有率が１００質量％であり、
    　前記バイオマス材料を構成するポリオレフィン樹脂がポリプロピレン樹脂である、請求項１に記載の筆記具用インキ収容管。     The content of the biomass material in the resin is 100% by mass,
    2. The ink storage tube for a writing instrument according to claim 1, wherein the polyolefin resin constituting said biomass material is polypropylene resin.
  8. 　前記バイオマス材料の曲げ弾性率が１００～２１００ＭＰａである、請求項１に記載の筆記具用インキ収容管。 The ink storage tube for a writing instrument according to claim 1, wherein the biomass material has a flexural modulus of 100 to 2100 MPa.
  9. 　前記バイオマス材料の水蒸気透過度が４０℃、９０％ＲＨの条件下において２５ｇ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下であり、
    　酸素透過度が、２０℃、９０％ＲＨの条件下において２００００ｍＬ／ｍ２・ａｔｍ・２４ｈｒ／２５μｍ以下である、請求項１に記載の筆記具用インキ収容管。     The water vapor permeability of the biomass material is 25 g/m 2 ·atm · 24 hr/25 μm or less under conditions of 40 ° C. and 90% RH,
    2. The ink container for a writing instrument according to claim 1, wherein the oxygen permeability is 20000 mL/m <2> .atm.24 hr/25 [mu]m or less under conditions of 20[deg.] C. and 90% RH.
  10. 　請求項１～９のいずれか一項に記載の筆記具用インキ収容管と、
    　前記筆記具用インキ収容管に収容されるインキとを備える、筆記具用中芯。     an ink storage tube for a writing instrument according to any one of claims 1 to 9;
    A core for a writing instrument, comprising ink to be stored in the ink storage tube for a writing instrument.
  11. 　請求項１０に記載の筆記具用中芯を有する筆記具。 A writing instrument having the core for writing instruments according to claim 10.
PCT/JP2022/035507 2021-09-29 2022-09-22 Ink storage tube for writing utensils, inner core for writing utensils, and writing utensil WO2023054201A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007169608A (en) * 2005-11-22 2007-07-05 Mitsubishi Pencil Co Ltd Resin composition for liquid storage container and liquid storage container composed of the same
JP2018122496A (en) * 2017-01-31 2018-08-09 株式会社パイロットコーポレーション Pressurizing-type ballpoint pen
JP2021031563A (en) * 2019-08-22 2021-03-01 福助工業株式会社 Resin composition and resin molding

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007169608A (en) * 2005-11-22 2007-07-05 Mitsubishi Pencil Co Ltd Resin composition for liquid storage container and liquid storage container composed of the same
JP2018122496A (en) * 2017-01-31 2018-08-09 株式会社パイロットコーポレーション Pressurizing-type ballpoint pen
JP2021031563A (en) * 2019-08-22 2021-03-01 福助工業株式会社 Resin composition and resin molding

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