Ink storage member for writing instrument

Abstract

Provided is a liquid storage member for a coating tool, which further reduces the influence on the environment by using silica instead of conventional aluminum as a material for an intermediate layer interposed between an inner layer and an outer layer, both of which are made of paper as a base material, in a paper refill for a writing tool. An ink storage member for a writing instrument is characterized by having at least three layers comprising an inner layer of a paper base material, an intermediate layer formed on the outer surface of the inner layer, and an outer layer of a paper base material formed on the outer surface of the intermediate layer, the intermediate layer has at least one of an alumina film layer, a silica film layer formed from low molecular silane, and a silica film layer formed from polysilazane.

Description

Technical Field

[0001] The present invention relates to an ink containing member for a writing instrument using paper. Background Art

[0002] Traditionally, transparent or translucent plastics such as polypropylene have been used in ink containing components of writing instruments such as ballpoint pens, but in recent years, there has been a growing momentum to address global environmental issues, such as reducing the use of plastics, and proposals have been proposed that focus on eliminating plastics from the various components that make up writing instruments.

[0003] For example, Patent Document 1 discloses an ink storage member for writing tools, which uses a multi-layered ink storage tube, wherein one or two or more other resin layers are molded inside a storage tube base molded from a biodegradable resin. The document states that the storage tube base molded from a biodegradable resin is biodegradable over time, and thus can help reduce the amount of waste disposal.

[0004] On the other hand, there has been proposed a writing instrument having a pen holder formed by spirally molding a composite material in which a synthetic resin having barrier properties or a metal such as aluminum is laminated on a paper base material (Patent Document 2).

[0005] In order to improve water resistance and gas barrier properties, the pen holder has the following structure: from the outer surface side of the pen holder, two layers of aluminum foil label paper and liner paper are laminated, and then a polyethylene layer is laminated on the inner surface, and then a polyester film with an aluminum vapor-deposited film on the outer side is laminated. According to Patent Document 2, by using a composite material including a paper substrate for a pen holder, a writing tool that maintains durability and achieves low pollution can be provided.

[0006] In addition, Patent Document 3 discloses a liquid containing member for a coating tool, which has at least three layers consisting of a paper substrate laminate and an outer layer, wherein the paper substrate laminate has an inner layer of a paper substrate and an intermediate layer formed on the outer peripheral surface of the inner layer and being a metal layer or a silicon dioxide vapor-deposited layer, and the outer layer is formed on the outer peripheral surface of the intermediate layer and is composed of a paper substrate. In the liquid containing member, the paper substrate laminate and the outer layer are spirally wound in contact with each other so that their adjacent surfaces do not overlap, and the interval between the joints between the outer layers and the joints between the paper substrate laminate is ensured to be 1 mm or more and less than half the width of the outer layer, thereby preventing ink leakage.

[0007] Patent document 4 discloses an ink storage member for a writing tool, wherein an ink storage tube is formed using paper as a base material, and one end of the ink storage tube is connected to a connection portion formed on a writing member or a relay member supporting the writing member. In the ink storage member, a locking means is applied to the connection portion of the relay member supporting the writing member to ensure a certain connection strength to the ink storage tube, thereby providing a practical writing tool.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Publication No. 2001-146091

[0011] Patent Document 2: Japanese Patent Application Publication No. 62-70097

[0012] Patent Document 3: Japanese Patent Application Publication No. 2021-16976

[0013] Patent Document 4: Japanese Patent Application Publication No. 2020-172044 Summary of the invention

[0014] Problem that the invention aims to solve

[0015] However, all ink storage components are based on paper, so in order to give the paper substrate strength and gas barrier properties, composite materials made of laminated metals such as synthetic resins or aluminum are used. For example, aluminum has many alloy types and it is difficult to extract high-purity aluminum, which has recycling problems, so there is room for further research in reducing environmental burdens.

[0016] The object of the present invention is to provide a liquid containing member for a coating tool that further reduces the impact on the environment by using a specific silica film instead of conventional aluminum as the material of an intermediate layer sandwiched between an inner layer and an outer layer both of which are made of paper as a base material in a paper-made pen core for a writing tool.

[0017] Solutions for solving problems

[0018] The ink containing component for writing instruments of the present invention is characterized in that it has at least three layers consisting of an inner layer of a paper substrate, an intermediate layer formed on the outer surface of the inner layer, and an outer layer of a paper substrate formed on the outer surface of the intermediate layer, and the intermediate layer has at least one of an aluminum oxide film layer, a silicon dioxide film layer formed by low molecular weight silane, and a silicon dioxide film layer formed by polysilazane.

[0019] The intermediate layer preferably has an aluminum oxide film layer, a silicon dioxide film layer formed from low molecular weight silane, or a silicon dioxide film layer formed from polysilazane on one or both sides of the paper substrate.

[0020] The inner layer and the middle layer, or the middle layer and the outer layer are preferably bonded together via an olefin-based adhesive or a silane coupling agent.

[0021] At least one of the paper substrates forming the inner layer and the outer layer is preferably glass paper.

[0022] Effects of the Invention

[0023] In the present invention, by making the intermediate layer between the inner layer and the outer layer both composed of a paper substrate be at least one of an aluminum oxide film layer, a silicon dioxide film layer obtained by reacting a low molecular weight silane, and a silicon dioxide film layer obtained by reacting a polysilazane, it is possible to impart high water repellency and durability to the ink containing member compared to a conventional writing instrument using aluminum for the intermediate layer. The silicon dioxide film layer is a silicon dioxide coating obtained by reacting a low molecular weight silane or a polysilazane on the surface of the paper substrate.

[0024] The intermediate layer may be in the form of a layer having an aluminum oxide film or a silicon dioxide film on one or both sides of a paper substrate. The silicon dioxide film is firmly adhered to the paper substrate layer.

[0025] By using a cyclic olefin polymer as an adhesive between the inner layer, the intermediate layer, or the outer layer, it is possible to impart high gas barrier properties to the ink containing member.

[0026] According to the present invention, it is possible to provide an ink containing member for a writing instrument with a further reduced environmental burden. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figures show a form in which an adhesive layer is provided between an inner layer and an intermediate layer and between an inner layer and an outer layer in an ink containing member for a writing instrument.

[0028] Figure 2 This is a diagram showing an example of the structure of a writing core including the ink containing member for a writing instrument of the present invention. Figure 2 (a) is the front view of the appearance of the refill, Figure 2 (b) is a cross-sectional view of the pen core taken along the line A-A'.

[0029] Figure 3 It is a figure which shows the three-layer or five-layer structure of the inner layer, the middle layer, and the outer layer which comprise the ink containing member for writing instruments of this invention. Figure 3 (a) shows a three-layer structure of a paper substrate layer, a silica film layer (or an aluminum oxide film layer), and a paper substrate layer, in which an adhesive layer is provided between the paper substrate layer and the silica film layer (or an aluminum oxide film layer). Figure 3(b) is a schematic cross-sectional view of the morphology of Examples 1 to 4, showing a morphology in which an adhesive layer is provided between the inner layer and the middle layer and between the middle layer and the outer layer in a five-layer structure having an inner layer composed of a paper substrate, an intermediate layer having a silicon dioxide film layer (or an aluminum oxide film layer) on both sides of the paper substrate layer, and an outer layer composed of a paper substrate. DETAILED DESCRIPTION

[0030] Hereinafter, the ink containing member for a writing instrument of the present invention will be described in detail with reference to the accompanying drawings.

[0031] Figure 2 1 is a diagram showing an example of the structure of a writing cartridge including an ink containing member 10 for a writing instrument of the present invention. Figure 2 (a) shows a front view of the appearance of the refill, Figure 2 (b) shows a cross-sectional view of the pen core taken along the line AA'.

[0032] Figure 2 For example, the refill housed in the pen barrel of a ballpoint pen comprises: an ink containing member 10 for a writing tool (hereinafter, also referred to as "ink containing member 10"), which is an elongated cylindrical ink containing tube with paper as a base material and which contains ink not shown; a joint 11, which is installed at the front end of the ink containing member 10; and a ballpoint pen tip 12, which is installed at the front end of the joint 11 as a writing member.

[0033] Specifically, the joint 11 is formed with a cylindrical rear end portion joined to the ink containing member 10 and a cylindrical front end portion having an outer diameter larger than the rear end portion, and the ballpoint pen tip 12 is mounted on the front end portion. In addition, in order to make the joint portion with the ink containing member 10 have a certain joint strength, an adhesive is applied to the rear end portion of the joint 11 in advance, and in this state, the joint 11 is joined to the ink containing member 10 by pressing the rear end portion of the joint 11 into the front end of the ink containing member 10. Thus, the ink containing member 10 and the ballpoint pen tip 12 are connected via the joint 11 in a manner that ink can flow.

[0034] The ink containing member 10 for writing instruments of the present invention has at least three layers consisting of an inner layer 1 of a paper substrate, an intermediate layer 2 formed on the outer surface of the inner layer 1, and an outer layer 3 of a paper substrate formed on the outer surface of the intermediate layer 2. Therefore, the ink containing member 10 for writing instruments may be, for example, a four-layer structure in which the outer layer 3 is further laminated on the three-layer structure, or a six-layer structure in which the three-layer structure consisting of the inner layer 1, the intermediate layer 2, and the outer layer 3 is laminated twice. Figure 1 The ink containing member 10 having a three-layer structure has an adhesive layer 5 between the inner layer 1 and the intermediate layer 2 and / or between the intermediate layer 2 and the outer layer 3 .

[0035] As the paper base material constituting the inner layer 1 and the outer layer 3, various known papers such as top grade paper, medium grade paper, single gloss paper, kraft paper, single gloss kraft paper, bleached kraft paper, cardboard, white cardboard, kraft cardboard, lightly coated paper, coated paper, coated paper, cast-coated paper, glass paper, and parchment can be used. These paper base materials can be used alone or in combination of two or more.

[0036] Among these paper substrates, glass paper with high density, high transparency, oil resistance and water resistance is preferred. Glass paper is made by highly beating virgin pulp and using a super calender to process under high pressure to compress and smooth the fibers of the pulp to make it dense. Its thickness is usually 20 to 50 μm. When used for the inner layer 1, the thickness of the glass paper is preferably 20 to 60 μm, and when used for the outer layer, it is preferably 20 to 200 μm. In addition, the density of the glass paper is preferably 0.8 g / cm 3 above.

[0037] In order to impart water repellency, silicone oil or the like may be applied to the inner side of the inner layer 1 that comes into contact with the ink.

[0038] The intermediate layer 2 is a layer having an aluminum oxide film layer or a silicon dioxide film layer. The silicon dioxide film layer uses polysilazane or low molecular weight silane as a precursor. Figure 3 (a) schematically shows a configuration in which the intermediate layer 2 between the inner layer 1 and the outer layer 3 is a silicon dioxide film.

[0039] The intermediate layer 2 may be a layer having an aluminum oxide coating or a silicon dioxide coating on one or both surfaces of a paper substrate. Figure 3 (b) is a schematic cross-sectional view of the embodiment of Examples 1 to 4, schematically showing the embodiment in which the intermediate layer 2 between the inner layer 1 and the outer layer 3 is a layer having an aluminum oxide film layer or a silicon dioxide film layer including a paper substrate.

[0040] The paper base material constituting the inner layer 1 and the outer layer 3 can be used.

[0041] Polysilazanes include perhydropolysilazanes that form inorganic films and organic polysilazanes that form inorganic-organic hybrid films with higher film coating performance.

[0042] Perhydropolysilazane is an inorganic polymer soluble in an organic solvent consisting only of Si-H bonds, NH bonds and Si-N bonds. Perhydropolysilazane reacts with moisture in the air to introduce silyl groups and produce ammonia, while condensing to form a high-hardness amorphous silicon dioxide film. As commercially available perhydropolysilazane, coating solutions such as Durazane 2800 (Merck) and Durazane 2200 (Merck) are known to be dissolved in organic solvents.

[0043] The organopolysilazane (also referred to as Organopolysilazane) is, for example, methylpolysilazane or dimethylpolysilazane, etc. The organopolysilazane includes commercially available products such as Durazane 1033 (manufactured by Merck) and Durazane 1500RC (manufactured by Merck).

[0044] A solution prepared by dissolving perhydropolysilazane and organopolysilazane in a volatile organic solvent such as an aromatic or alicyclic solvent, ether, or halogenated hydrocarbon is applied to the surface of the inner layer 1 and the outer layer 3 by dipping or spin coating, and heat treated at 150 to 180° C. to form a silicon dioxide film.

[0045] The silicon dioxide coating formed using the polysilazane has high hardness and is brittle, and therefore, the thickness thereof is usually preferably 300 to 1300 μm, and particularly preferably 500 to 900 μm.

[0046] Low molecular weight silane has multiple organic functional groups and hydrolyzable alkoxy groups in the molecule, and forms an amorphous silica coating by dehydration crosslinking. Low molecular weight silane is easier to penetrate into the fine concavoconvexities on the surface of the inner layer 1 and the outer layer 3 than polysilazane due to its low molecular weight, and adheres to the inner layer 1 and the outer layer 3 with a strong anchoring effect. The thickness of the silica layer formed using low molecular weight silane is preferably 300 to 1000 μm, and particularly preferably 500 to 900 μm.

[0047] Even when polysilazane and low molecular weight silane are used, a silicon dioxide film as a reaction product thereof has higher gas barrier properties than a silicon dioxide vapor-deposited film.

[0048] A layer composed of an adhesive (hereinafter referred to as “adhesive layer 5 ”) may be provided between the inner layer 1 and the intermediate layer 2 and between the intermediate layer 2 and the outer layer 3 .

[0049] The adhesive is preferably an olefin adhesive or a silane coupling agent. The olefin adhesive or the silane coupling agent serves as an adhesive for bonding the inner layer 1, the intermediate layer 2, and the outer layer 3 together, and also serves to reinforce the paper base material.

[0050] Olefin adhesives are adhesives formed from polyolefin resins such as polyethylene ionomers, polyethylene elastomers, high-density polyethylene, low-density polyethylene, polypropylene ionomers, polypropylene elastomers and cyclic olefin polymers. Polyolefin resins also include modified polyolefin resins such as maleic anhydride-modified polypropylene. Among these polyolefin resins, cyclic olefin polymers are preferred from the perspective of being able to impart gas barrier properties.

[0051] Examples of the cyclic olefin polymer include cyclic olefin polymers such as polymers obtained by ring-opening polymerization and hydrogenation of norbornenes; and cyclic olefin copolymers such as copolymers of tetracyclododecene and olefins such as ethylene.

[0052] As the olefin-based adhesive, one or a combination of two or more selected from the above-mentioned polyolefin resins can be used.

[0053] The olefin adhesive may be directly applied to the inner layer 1 and the outer layer 3, or may be used in the form of a dispersion or emulsion type resin liquid using a polyolefin resin as a base polymer. A silane coupling agent described below may be added to the resin liquid as needed.

[0054] The silane coupling agent is a compound having both a site that reacts with an organic compound and a site that reacts with an inorganic compound. The silane coupling agent allows the interface between the paper substrate of the inner layer 1 or the outer layer 3 and the silica coating of the intermediate layer 2 to be bonded by chemical bonds, thereby preventing water from entering and improving the durability and weather resistance of the ink containing member 10. Preferred silane coupling agents include epoxy, vinyl, styrene, methacryl, acryl, amino, isocyanurate, urea, mercapto, isocyanate, and anhydride. Specifically, vinyl trimethoxysilane, vinyl triethoxysilane, p-styrene trimethoxysilane, 3-glycidoxypropyl methyl dimethoxysilane, 3-glycidoxypropyl trimethoxysilane, 3-glycidoxypropyl methyl diethoxysilane, 3-glycidoxypropyl triethoxysilane, 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane, N-2-(aminoethyl)-3-aminopropyl methyl dimethoxysilane, N-2-(aminoethyl)-3-aminopropyl trimethoxysilane, and N-phenyl-3-aminopropyl trimethoxysilane can be used. , N-(vinylbenzyl)-2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethyl-butylene)propylamine, tris(trimethoxysilylpropyl)isocyanurate, 3-ureapropyltrialkoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane and 3-trimethoxysilylpropylsuccinic anhydride, etc.

[0055] For example, when the inner layer 1 and the middle layer 2 are bonded using an olefin-based adhesive or a silane coupling agent, the adhesive is applied so as to accumulate near the center of the inner layer 1 or the middle layer 2. Next, while pressing the inner layer 1 and the middle layer 2 together, the adhesive is spread over the entire bonding surface and the two layers are bonded so that no bubbles remain in the bonding portion and there is no bonding defect. After the inner layer 1 and the middle layer 2 are bonded together, they are fixed under pressure until the adhesive is cured.

[0056] The adhesive is 5 to 50 g / m 2 About 5 to 25 g / m 2 The amount is applied to the inner layer 1 or the middle layer 2.

[0057] The ratio of the thickness (μm) of each of the inner layer 1 , the intermediate layer 2 , and the outer layer 3 is usually 20 to 60: 300 to 1000: 20 to 200, and preferably 20 to 30: 500 to 900: 50 to 200.

[0058] The ratio of the thickness of the paper substrate of the inner layer 1 or the outer layer 3 to the thickness of the layer formed of the aluminum oxide film or the silicon dioxide film of the intermediate layer 2 is about 2 / 1 to 1200 / 1. For example, the total thickness of the inner layer 1 and the outer layer 3 is 40 to 260 μm, and the thickness of the intermediate layer 2 is 300 to 1300 μm.

[0059] The laminating paper formed by stacking the inner layer 1, the middle layer 2 and the outer layer 3 in sequence is cut into a width of 4 to 20 mm using a bobbin cutter or the like to form a strip-shaped sheet. Next, the strip-shaped sheet is wound into a cylindrical shape and formed using a spiral machine or the like. Forming into a cylindrical shape means using one or more pieces, for example, 2 to 4 pieces of laminating paper cut into the specified width and winding and pasting them on a core rod to form a cylindrical shape. The strip-shaped sheet is wound on a mandrel (paper tube manufacturing machine) in such a way that the inner layer 1 becomes the inner side. The winding method includes a method of winding the sheet on the mandrel in a spiral shape (spiral winding) and a method of winding the sheet at right angles to the mandrel (flat winding), etc. From the perspective of strength, spiral winding is preferred. It should be noted that in order to make the mandrel easy to pull out, it is preferred to treat the surface of the mandrel with an appropriate lubricant in advance, or to apply an appropriate amount of lubricant to the surface of the inner layer 1 on the side wound on the mandrel. When two or more layers of laminating paper are stacked, an adhesive is applied to the outer layer 3, and the laminating paper is further wound into a spiral shape so that the inner layer 1 of the laminating paper faces inside.

[0060] In order to spirally wind the pasting paper onto the mandrel, it is more preferable to make it into a strip-shaped sheet with a width of 5 to 15 mm. If such a wide pasting paper is used for spiral winding, the required length of the liquid containing member 10 can be reached in just a few turns, and as a result, the number of contact surfaces between the pasting papers is small, and leakage of the ink contained in the ink containing member 10 can be suppressed.

[0061] As described above, in a preferred embodiment of the ink containing member 10 of the present invention, the ink containing member 10 has a structure in which the pasting paper is spirally wound in a manner that the adjacent surfaces thereof do not overlap each other along the length direction of the ink containing member 10. As for the overlap of the adjacent surfaces, it is assumed that the adjacent surfaces of the pasting paper overlap each other at the contact portion between the pasting paper, that is, the seams 4 and 4', and the overlap width is set to a maximum of 1 mm. By contacting in a manner that the seams 4 and 4' do not overlap or setting the overlap width to a maximum of 1 mm, it is possible to suppress the leakage of ink from the seams 4 and 4'. When the overlap width at the seams 4 and 4' is greater than 1 mm, a step appears in the overlapped portion, and ink may leak out.

[0062] When another pasting paper is wound on the surface of the pasting paper wound into a spiral shape, it is also preferred to wind the other pasting paper so that the adjacent surfaces of the other pasting paper are in contact with each other. When two or more layers of pasting paper are wound, even if the seams of the pasting paper forming the outermost layer of the ink storage member 10 overlap each other, there is no problem of liquid leakage.

[0063] The ink containing member 10 is completed by cutting the cylindrical molded body after the core shaft is pulled out into a desired predetermined length and drying it at an appropriate temperature and humidity for several hours.

[0064] The size of the ink containing member 10 is the size used for ordinary writing tools and is not particularly limited. It is approximately 1.5 to 5 mm in inner diameter, 1.8 to 10 mm in outer diameter, and 30 to 150 mm in length.

[0065] From the perspective of obtaining excellent strength, the tensile strength of the ink containing member 10 is preferably 3.5 kN / m or more, more preferably 4.5 kN / m or more, and further preferably 5.5 kN / m or more. The tensile strength is measured by the tensile strength test method specified in JIS P 8113:2006.

[0066] The writing implement of the present invention includes, for example, fountain pens, ballpoint pens, marker pens, signing pens, felt pens, correction tools, calligraphy pens, etc. At this time, the ink contained in the ink containing member 10 can be any of water-based (gel) ink and oil-based ink, and ink for ballpoint pens or marker pens, etc., is appropriately used according to the type of pen.

[0067] Example

[0068] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to the following examples.

[0069] The ink containing member of the present invention was evaluated by the following method.

[0070] (1) Bending test

[0071] The distance between the supporting points was set to 64 mm, and the center of the paper tube 1 was pressed at a speed of 100 mm / min using a bending wedge-shaped jig. The measured value when the paper tube was bent was defined as the bending strength.

[0072] The evaluation was A when the bending strength was 4.0 N or more, B when it was more than 2.0 N and less than 4.0 N, and C when it was 2.0 N or less.

[0073] (2) Tensile strength

[0074] The measurement was performed using a horizontal tensile testing machine (manufactured by Kumagai Riki Kogyo Co., Ltd.) according to the tensile strength test method specified in JIS P 8113:2006.

[0075] The tensile strength was evaluated as A when it was 3.5 kN / m or more, B when it was more than 1.5 kN / m and less than 3.5 kN / m, and C when it was 1.5 kN / m or less.

[0076] [Example 1]

[0077] A solution prepared by dissolving 15 g of tetraethoxysilane (Tokyo Chemical Industry Co., Ltd.) as a low molecular weight silane and 15 g of an organic polysilazane (Durazane 1500RC; Merck & Co., Ltd.) in dibutyl ether was applied to the entire surface and back of a high-quality paper (Shiraoi; manufactured by Nippon Paper Industries, Ltd.), and then heated at 180°C to form a silica coating.

[0078] Next, an olefin adhesive (CHEMIPEAR LS500; manufactured by Mitsui Chemicals, Inc.) was applied to the silica films formed on both sides of the high-quality paper, and two sheets of 25 μm thick glass paper (basis weight 25 g / m 2 、Density 1.0g / cm 3 ) are sandwiched and bonded to produce a laminated paper having a laminated structure consisting of glass paper, silica film, fine paper, silica film and glass paper. The thickness of the laminated paper is 791 μm, the total thickness of the silica film is 571 μm, and the total thickness of the adhesive layer is 8.5 μm.

[0079] Cut the laminating paper into 13 mm width using a bobbin cutter.

[0080] The rectangular strip-shaped pasting paper is wound onto the outer peripheral surface of the mandrel of a paper tube manufacturing machine (Langston) to make a spiral cylinder. At this time, the pasting paper is wound in a non-overlapping manner with its adjacent surfaces butted against each other.

[0081] The obtained spiral tube was cut into pieces having a length of 89.3 mm to obtain an ink containing member having an inner diameter of 3.8 mm.

[0082] The results are shown in Table 1. Both the flexural strength and the tensile strength were A.

[0083] [Example 2]

[0084] In Example 1, a laminating paper was prepared in the same manner as in Example 1 except that 3-glycidyloxypropyltrimethoxysilane (KBM-1083; manufactured by Shin-Etsu Siloxane Co., Ltd.) was used as a silane coupling agent instead of the olefin-based adhesive.

[0085] A spiral cylindrical body was prepared in the same manner as in Example 1 and cut to obtain an ink containing member.

[0086] The results are shown in Table 1. Both the flexural strength and the tensile strength were A.

[0087] [Example 3]

[0088] A laminating paper was prepared in the same manner as in Example 1 except that 3-methacryloxypropylmethyldimethoxysilane (KBM-502: manufactured by Shin-Etsu Silicones Co., Ltd.) was used as a silane coupling agent in combination with the olefin-based adhesive (CHEMIPEARL S500 manufactured by Mitsui Chemicals, Inc.).

[0089] A spiral cylindrical body was prepared in the same manner as in Example 1 and cut to obtain an ink containing member.

[0090] The results are shown in Table 1. Both the flexural strength and the tensile strength were A.

[0091] [Example 4]

[0092] A solution prepared by dissolving 15 g of tetraethoxysilane (Tokyo Chemical Industry Co., Ltd.) as a low molecular weight silane and 15 g of an organic polysilazane (Durazane 1500RC; Merck & Co., Ltd.) in dibutyl ether was applied to one surface of a high-quality paper (Shiraoi; manufactured by Nippon Paper Industries, Ltd.), and then heat-treated at 180° C. to form a silica coating.

[0093] Next, an aluminum oxide film was formed on the other surface of the premium paper by sputtering.

[0094] A resin solution containing an olefin adhesive (CHEMIPEARLS500, manufactured by Mitsui Chemicals) and 3-methacryloxypropylmethyldimethoxysilane (KBM-502, manufactured by Shin-Etsu Silicone Co., Ltd.) was applied to the surface of the silica film and the alumina film of the high-quality paper, and then two sheets of 25 μm thick glass paper (basic weight 25 g / m 2 、Density 1.0g / cm 3) are sandwiched and bonded to produce a laminated paper having a laminated structure consisting of glass paper, silica coating, fine paper, aluminum oxide film and glass paper. The thickness of the laminated paper is 785 μm, the thickness of the silica coating is 456 μm, the thickness of the aluminum oxide film is 114 μm, and the total thickness of the adhesive layer is 8.5 μm.

[0095] A spiral cylindrical body was prepared in the same manner as in Example 1 and cut to obtain an ink containing member.

[0096] The results are shown in Table 1. Both the flexural strength and the tensile strength were A.

[0097] [Comparative Example 1]

[0098] A 10 μm-thick silica vapor-deposited film was formed on the entire front and back surfaces of a high-quality paper (Shiraoi; manufactured by Nippon Paper Manufacturing Co., Ltd.).

[0099] Next, an olefin adhesive (CHEMIPEARL S500 manufactured by Mitsui Chemicals, Inc.) was applied to the silica deposited layers formed on both sides of the high-quality paper, and two sheets of 25 μm thick glass paper (basic weight 25 g / m 2 、Density 1.0g / cm 3 ) are sandwiched and bonded to produce a laminated paper having a laminated structure consisting of glass paper, a silica vapor-deposited layer, a fine paper, a silica vapor-deposited layer, and glass paper. The total thickness of the laminated paper is 757 μm, the total thickness of the silica vapor-deposited film is 610 μm, and the total thickness of the adhesive layer is 6.1 μm.

[0100] Cut the laminating paper into 13 mm width using a bobbin cutter.

[0101] A spiral cylindrical body was prepared in the same manner as in Example 1 and cut to obtain an ink containing member.

[0102] In the ink containing member of Comparative Example 1, since the intermediate layer 2 is a silicon dioxide vapor-deposited film, sufficient strength cannot be obtained compared with the ink containing members 10 of Examples 1 to 4.

[0103] [Reference example]

[0104] In Comparative Example 1, a laminated paper having a laminated structure consisting of glass paper, aluminum foil, premium paper, aluminum foil, and glass paper was prepared in the same manner as in Comparative Example 1, except that a 6.5 μm thick aluminum foil was laminated to the entire surface and back of premium paper (Shiraoi; manufactured by Nippon Paper Industries, Ltd.) instead of a silica vapor-deposited layer. The total thickness of the laminated paper was 732 μm, the total thickness of the aluminum foil was 602 μm, and the total thickness of the adhesive layer was 6.5 μm.

[0105] Cut the laminating paper into 13 mm width using a bobbin cutter.

[0106] A spiral cylindrical body was prepared in the same manner as in Example 1 and cut to obtain an ink containing member.

[0107] The ink containing member of the reference example in which the intermediate layer 2 is aluminum foil has performance equivalent to the ink containing members 10 of Examples 1 to 4, but aluminum has problems in terms of environmental burden and recycling, and research on alternative materials is a technical issue.

[0108] Table 1 shows the materials and evaluation results of the ink containing members in Examples 1 to 4, Comparative Example 1, and Reference Example.

[0109] [Table 1]

[0110]

[0111] It should be noted that, in the present embodiment, as an example, a structure in which the intermediate layer 2 having a silicon dioxide film layer or an aluminum oxide film layer formed on both sides of the paper substrate is set to be one layer is prepared, but it is not limited to this. The number of layers of the intermediate layer 2 can be, for example, two layers or three layers or more, depending on the use conditions of the writing instrument or the product specifications (materials, dimensions, etc.). In this case, at least one of the layers (innermost layer and intermediate layer) other than the outermost layer in the intermediate layer 2 can be a paper substrate layer. In addition, as for the adhesive layer that tightly bonds the layers of the intermediate layer 2, as long as it can prevent the ink from leaking to the outside of the ink containing member 10, it can also be one or more of the layers (innermost layer and intermediate layer) other than the outermost layer in the intermediate layer 2, depending on the use conditions of the writing instrument or the product specifications, etc.

[0112] Description of Reference Numerals

[0113] 10Ink storage member for writing tools

[0114] 11 Connectors

[0115] 12 ballpoint pen tips

[0116] 1. 1' inner layer

[0117] 2. 2' middle layer

[0118] 3 Outer Layer

[0119] 4, 4' seam

[0120] 5 Adhesive layer

Claims

1. An ink storage component for a writing tool, characterized in that: It has at least three layers consisting of an inner layer of a paper base material, an intermediate layer formed on the outer surface of the inner layer, and an outer layer of a paper base material formed on the outer surface of the intermediate layer, The intermediate layer includes at least one of an aluminum oxide film layer, a silicon dioxide film layer formed by low molecular weight silane, and a silicon dioxide film layer formed by polysilazane.

2. The writing tool ink storage member according to claim 1, wherein: The intermediate layer has an aluminum oxide film layer, a silicon dioxide film layer formed by low molecular weight silane, or a silicon dioxide film layer formed by polysilazane on one side or both sides of the paper substrate.

3. The writing tool ink containing member according to claim 1 or 2, wherein: The inner layer and the middle layer, or the middle layer and the outer layer are bonded together by an olefin-based adhesive or a silane coupling agent.

4. The writing tool ink containing member according to claim 1 or 2, wherein: At least one of the paper substrates forming the inner layer and the outer layer is glass paper.

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