Ink packaging containers

Abstract

To provide a new packaging container for ink which can obtain cleanability of the container while securing water resistance of a drawn line.SOLUTION: A packaging container for ink is filled with ink for an aqueous writing instrument, wherein the ink for the aqueous writing instrument contains an aqueous solvent, a coloring material and a sticking resin component, the packaging container has an ink storage part having at least a paper layer and an inside resin layer brought into contact with the ink for the aqueous writing instrument, and a contact angle between the ink for the writing instrument and the inside resin layer after 5,000 ms when 1 μl of the ink for the aqueous writing instrument is deposited onto the inside resin layer is 10° or more.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a packaging container for ink.

Background Art

[0002] In recent years, from the perspective of considering environmental issues, writing tools having a paper base material have been proposed to suppress the use of plastics on the premise of disposable use.

[0003] In Patent Document 1, there is provided a paper base material laminate including an inner layer of a paper base material and an intermediate layer formed on the outer peripheral surface of the inner layer and being a metal layer or a silica vapor deposition layer, and an outer layer made of a paper base material formed on the outer peripheral surface of the intermediate layer, and having at least three layers. The density of the paper base material of the inner layer is 0.8 g / cm

[0007] , , , , , , , or more, and a liquid storage member for a coating tool is disclosed.

[0004] In Patent Document 2, an ink storage member for a writing tool is disclosed, which is characterized in that an ink storage tube is formed with a paper base material, and one end of the ink storage tube is coupled to a connection portion formed in a writing member or an intermediate member supporting the writing member.

[0005] In Patent Document 3, a brush-type paint applicator with a paint container is disclosed, which includes a brush having a sag inside, a bottle for storing paint to be supplied to the brush, a screw-on cap attached to the bottle, the cap having an opening continuous with the sag at the central portion and a paint reservoir having a volume for storing paint disposed outside adjacent to the opening, and a valve for supplying the paint from the bottle to the paint reservoir.

[0006] Note that in Patent Document 4, a paper container with a stopper is disclosed.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

[0008] The present invention provides a novel ink packaging container that ensures water resistance of the drawn lines while also providing easy cleaning of the container. [Means for solving the problem]

[0009] The inventors, after diligent research, discovered that the above problems could be solved by the following means, and thus completed the present invention. That is, the present invention is as follows: <Aspect 1> An ink packaging container filled with water-based writing instrument ink, The aforementioned water-based writing instrument ink contains a water-based solvent, a colorant, and a fixing resin component. The ink packaging container has at least an ink storage portion having a paper layer and an inner resin layer in contact with the water-based writing instrument ink, and After 5000ms, when 1 μl of the aforementioned water-based writing instrument ink is dropped onto the inner resin layer, the contact angle between the water-based writing instrument ink and the inner resin layer is 10° or more. Ink packaging container. <Aspect 2> The ink packaging container according to aspect 1, wherein the surfactant content in the water-based writing instrument ink is less than 1.0% by mass relative to the mass of the water-based writing instrument ink. <Aspect 3> The ink packaging container according to aspect 1 or 2, wherein the static surface tension of the water-based writing instrument ink is 18 mN / m or more. <Aspect 4> An ink packaging container according to any one of aspects 1 to 3, wherein the adhesive resin component is an acrylic resin or a urethane resin. <Aspect 5> An ink packaging container according to any one of aspects 1 to 4, wherein the coloring material is a pigment. <Aspect 6> An ink packaging container according to any one of aspects 1 to 5, wherein the inner resin layer is a polyolefin resin. <Aspect 7> An ink packaging container according to any one of aspects 1 to 6, wherein the arithmetic mean roughness Sa of the surface of the inner resin layer in contact with the water-based writing instrument ink, measured in accordance with ISO 25178, is 50 μm or less. <Aspect 8> An ink packaging container described in any one of aspects 1 to 7, which is a writing instrument. [Effects of the Invention]

[0010] According to the present invention, a novel ink packaging container can be provided that ensures water resistance of the drawn lines while also providing cleanability of the container. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is an overall perspective view of the ink packaging container of the present invention, which is a writing instrument. Figure 1(a) is a perspective view with the cap attached, Figure 1(b) is a perspective view with the cap removed, and Figure 1(c) is a perspective view with the writing part removed. [Figure 2] Figure 2 is an overall view of the ink packaging container of the present invention. Figure 2(a) is a top view of the ink packaging container of the present invention. Figure 2(b) is a front view of the ink packaging container of the present invention. Figure 2(c) is a side view of the ink packaging container of the present invention. Figure 2(d) is a side cross-sectional view of the ink packaging container of the present invention. [Figure 3] Figure 3 is an explanatory diagram of writing using the ink packaging container of the present invention. [Figure 4] Figure 4 shows a carton blank for obtaining the ink storage section of the ink packaging container of the present invention. [Figure 5]Figure 5 is a diagram showing the structure of the writing portion of the packaging container for ink of the present invention. Figure 5(a) is a top view of the writing portion. Figures 5(b) and 5(c) are perspective views of the writing portion. Figure 5(d) is a front view of the writing portion. Figure 5(e) is a side view of the writing portion. Figure 5(f) is a cross-sectional view of the writing portion taken along line f-f in Figure 5(a). Figure 5(g) is a bottom view of the writing portion. Figure 5(h) is a cross-sectional view of the writing portion taken along line h-h in Figure 5(a). [Figure 6] Figure 6 is a diagram showing the structure of an assembly composed of a cap portion, a writing portion, and a stopper portion of the packaging container for ink of the present invention. Figure 6(a) is a top view of the assembly. Figure 6(b) is a perspective view of the assembly. Figure 6(c) is a front view of the assembly. Figure 6(d) is a side view of the assembly. Figure 6(e) is a cross-sectional view of the assembly taken along line e-e in Figure 6(a). Figure 6(f) is a bottom view of the assembly. Figure 6(g) is a cross-sectional view of the assembly taken along line g-g in Figure 6(a). [Figure 7] Figure 7 is a diagram showing the structure of the stopper portion of the packaging container for ink of the present invention. Figure 7(a) is a perspective view of the stopper portion. Figure 7(b) is a top view of the stopper portion. Figure 7(c) is a cross-sectional view of the stopper portion taken along line c-c in Figure 7(b). Figure 7(d) is a front view of the stopper portion. Figure 7(e) is a side view of the stopper portion. Figure 7(f) is a bottom view of the stopper portion. Figure 7(g) is a perspective view of the stopper portion.

Mode for Carrying Out the Invention

[0012] 《Packaging Container for Ink》 The packaging container for ink of the present invention is a packaging container for ink filled with ink for aqueous writing instruments, where the ink for aqueous writing instruments contains an aqueous solvent, a coloring material, and a fixing resin component, the packaging container has at least an ink storage portion having a paper layer and an inner resin layer in contact with the ink for aqueous writing instruments, and After 5000 ms from dropping 1 μl of the ink for water-based writing instruments onto the inner resin layer, the contact angle between the ink for writing instruments and the inner resin layer is 10° or more.

[0013] Generally, in order to fix the drawn line to the writing surface, the ink for writing instruments contains a resin component for fixing. However, when such an ink for writing instruments is filled in a packaging container, the ink adheres to the inner resin layer. As a result, the cleaning property of the paper container deteriorates, and ultimately, it may hinder the reusability for repeated use.

[0014] In contrast, the inventors of the present invention have found that with the above configuration, it is possible to obtain the cleaning property of the packaging container while maintaining the fixing property of the drawn line.

[0015] After 5000 ms from dropping 1 μl of the ink for water-based writing instruments onto the inner resin layer, the contact angle between the ink for water-based writing instruments and the inner resin layer is 10° or more. From the viewpoint of suppressing the adhesion of the ink for water-based writing instruments to the inner resin layer, it is preferable that this contact angle is 15° or more, 20° or more, 23° or more, 25° or more, 28° or more, 30° or more, 35° or more, 40° or more, or 45° or more. Also, from the viewpoint of obtaining the fixing property of the drawn line to the writing surface, it is preferable that this contact angle is 100° or less, 90° or less, 80° or less, 70° or less, 60° or less, 55° or less, or 50° or less. This contact angle changes according to the types of each component in the ink for water-based writing instruments, the type of surfactant, and the type and surface roughness of the inner resin layer.

[0016] The static surface tension of the water-based writing instrument ink is preferably 18 mN / m or higher from the viewpoint of suppressing adhesion of the water-based writing instrument ink to the inner resin layer. This static surface tension may be 20 mN / m or higher, 23 mN / m or higher, 25 mN / m or higher, 28 mN / m or higher, 30 mN / m or higher, or 35 mN / m or higher, and may also be 70 mN / m or lower, 65 mN / m or lower, 60 mN / m or lower, 55 mN / m or lower, 50 mN / m or lower, 45 mN / m or lower, or 40 mN / m or lower. This static surface tension varies depending on the type of each component in the water-based writing instrument ink, the type of surfactant, and the type and surface roughness of the inner resin layer.

[0017] The static surface tension described above can be measured by the Wilhelmy method (plate method, using a platinum plate) under conditions of 25°C, 60% humidity, and atmospheric pressure (1 atm). For example, it can be measured using the "CBVP-Z" surface tension measuring device from Kyowa Interface Chemical Co., Ltd. The contact angle described above can be measured by the θ / 2 method under the same ambient conditions as described above. For example, it can be measured using an automatic contact angle measuring machine (DM500, Kyowa Interface Chemical Co., Ltd.).

[0018] When an ink packaging container is filled with ink, it may contain air in the space between the water-based writing instrument ink and the ink reservoir.

[0019] The following describes each component of the present invention.

[0020] <Water-based writing instrument ink> The water-based writing instrument ink of the present invention contains a water-based solvent, a colorant, and a fixing resin component.

[0021] The water-based writing instrument ink of the present invention may contain a surfactant of any choice.

[0022] The water-based writing instrument ink of the present invention can be obtained by mixing the above-mentioned materials.

[0023] (Aqueous solvent) The aqueous solvent is a solvent containing water, particularly a solvent containing more than 50% by mass of water, and may be, for example, a mixture of water and a water-soluble organic solvent. The water content in the aqueous solvent may be more than 50% by mass, 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 100% by mass.

[0024] Purified water, deionized water, etc., can be used as the water source.

[0025] Examples of water-soluble organic solvents that can be used include aromatics, alcohols, polyhydric alcohols, glycol ethers, hydrocarbons, esters, and the like. These solvents may be used individually or in combination.

[0026] Examples of aromatic compounds that can be used include benzyl alcohol, ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, propylene glycol monophenyl ether, diethylene glycol monophenyl ether, alkylsulfonate phenyl ester, butyl phthalate, ethylhexyl phthalate, tridecyl phthalate, ethylhexyl trimellitate, diethylene glycol dibenzoate, and dipropylene glycol dibenzoate.

[0027] Examples of alcohols that can be used include ethanol, n-propanol, isopropanol, n-butanol, isobutanol, tert-butyl alcohol, 1-pentanol, isoamyl alcohol, sec-amyl alcohol, 3-pentanol, tert-amyl alcohol, n-hexanol, methylamyl alcohol, 2-ethylbutanol, n-heptanol, 2-heptanol, 3-heptanol, n-octanol, 2-octanol, 2-ethylhexanol, 3,5,5-trimethylhexanol, nonanol, n-decanol, undecanol, n-decanol, trimethylnonyl alcohol, tetradecanol, heptadecanol, cyclohexanol, and 2-methylcyclohexanol.

[0028] Examples of polyhydric alcohols that can be used include ethylene glycol, diethylene glycol, 3-methyl-1,3-butanediol, triethylene glycol, dipropylene glycol, 1,3-propanediol, 1,3-butanediol, 1,5-pentanediol, hexylene glycol, octylene glycol, and the like.

[0029] Examples of glycol ethers that can be used include methyl isopropyl ether, ethyl ether, ethyl propyl ether, ethyl butyl ether, isopropyl ether, butyl ether, hexyl ether, 2-ethylhexyl ether, ethylene glycol monohexyl ether, ethylene glycol mono-2-ethyl butyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, 3-methyl-3-methoxy-1-butanol, 3-methoxy-1-butanol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, propylene glycol tertiary butyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monobutyl ether, and tetrapropylene glycol monobutyl ether.

[0030] Examples of hydrocarbons that can be used include linear hydrocarbons such as hexane, isohexane, heptane, octane, nonane, and decane, and cyclic hydrocarbons such as cyclohexane, methylcyclohexane, and ethylcyclohexane.

[0031] Examples of esters include propylene glycol methyl ether acetate, propylene glycol diacetate, 3-methyl-3-methoxybutyl acetate, propylene glycol ethyl ether acetate, ethylene glycol ethyl ether acetate, butyl formate, isobutyl formate, isoamyl formate, ethyl acetate, propyl acetate, butyl acetate, isopropyl acetate, isobutyl acetate, isoamyl acetate, methyl propionate, ethyl propionate, propyl propionate, isobutyl propionate, isoamyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, methyl isobutyrate, ethyl isobutyrate, and pro Pyryl, methyl valerate, ethyl valerate, propyl valerate, methyl isovalerate, ethyl isovalerate, propyl isovalerate, methyl trimethylacetate, ethyl trimethylacetate, propyl trimethylacetate, methyl caproate, ethyl caproate, propyl caproate, methyl caprylate, ethyl caprylate, propyl caprylate, methyl laurate, ethyl laurate, methyl oleate, ethyl oleate, caprylic acid triglyceride, tributyl citrate, octyl oxystearate, propylene glycol monolicinolate, methyl 2-hydroxyisobutyrate, 3-methoxybutyl acetate, etc. can be used.

[0032] The content of the water-soluble organic solvent may be less than 50% by mass, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 0% by mass, based on the total mass of the aqueous ink composition.

[0033] (Colorants) As colorants, various colorants that can be used in conventional inks, such as dyes, pigments, or mixtures of dyes and pigments, can be used. These colorants may be used individually or in mixtures.

[0034] As dyes, all dyes that dissolve or disperse in water can be used, including, for example, acid dyes such as eosin, foxine, water yellow #6-C, acid red, water blue #105, brilliant blue FCF, and nigrosine NB; direct dyes such as direct black 154, direct sky blue 5B, and violet BB; and basic dyes such as rhodamine and methyl violet.

[0035] As pigments, conventionally known inorganic and organic pigments such as titanium dioxide, resin particle pigments containing pigments or dyes, pseudo-pigments obtained by coloring resin emulsions with dyes or pigments, white plastic pigments, luminous pigments, pigments with silica or mica as a base material and a multi-layer coating of iron oxide or titanium dioxide on the surface, thermochromic pigments, photochromic particles, etc. can be used without limitation.

[0036] Examples of inorganic pigments that can be used include carbon black, titanium black, zinc oxide, red iron oxide, aluminum, chromium oxide, iron black, cobalt blue, iron yellow, viridian, zinc sulfide, lithopone, cadmium yellow, vermilion, cadmium red, lead yellow, molybdide orange, zinc chromate, strontium chromate, white carbon, clay, talc, ultramarine, precipitated barium sulfate, barite powder, calcium carbonate, lead white, navy blue, navy blue, manganese violet, aluminum powder, brass powder, etc.

[0037] Examples of organic pigments include azo lakes, insoluble azo pigments, chelate azo pigments, phthalocyanine pigments, perylene and perinone pigments, and nitroso pigments. Examples of such organic pigments include CI Pigment Blue 17, CI Pigment Blue 15, CI Pigment Blue 17, CI Pigment Blue 27, CI Pigment Red 5, CI Pigment Red 22, CI Pigment Red 38, CI Pigment Red 48, CI Pigment Red 49, CI Pigment Red 53, CI Pigment Red 57, CI Pigment Red 81, CI Pigment Red 104, CI Pigment Red 146, CI Pigment Red 245, CI Pigment Yellow 1, CI Pigment Yellow 3, CI Pigment Yellow 12, and CI Pigment Examples include CI Pigment Yellow 13, CI Pigment Yellow 14, CI Pigment Yellow 17, CI Pigment Yellow 34, CI Pigment Yellow 55, CI Pigment Yellow 74, CI Pigment Yellow 95, CI Pigment Yellow 166, CI Pigment Yellow 167, CI Pigment Orange 5, CI Pigment Orange 13, CI Pigment Orange 16, CI Pigment Violet 1, CI Pigment Violet 3, CI Pigment Violet 19, CI Pigment Violet 23, CI Pigment Violet 50, CI Pigment Green 7, etc.

[0038] Examples of thermochromic pigments include those produced by microencapsulating a thermochromic composition containing at least a leuco dye that functions as a color developer, a color developer that is a component capable of causing the leuco dye to develop color, and a color change temperature adjuster that can control the color change temperature in the color development of the leuco dye and the color developer, so that the composition has a predetermined average particle size (for example, 0.1 to 6 μm). This average particle size may be, for example, 0.1 μm or more, 0.2 μm or more, 0.3 μm or more, 0.5 μm or more, 0.7 μm or more, or 0.9 μm or more, and may also be 6 μm or less, 5 μm or less, 4 μm or less, 3 μm or less, 2 μm or less, or 1 μm or less.

[0039] As photochromic particles, for example, photochromic particles composed of at least one selected from photochromic substances such as photochromic dyes (compounds) and fluorescent dyes, and a resin such as a terpene phenol resin can be used. Alternatively, photochromic particles can be produced by microencapsulating a photochromic composition containing at least one selected from photochromic substances such as photochromic dyes (compounds) and fluorescent dyes, an organic solvent, and additives such as antioxidants, light stabilizers, and sensitizers, to a predetermined average particle size (e.g., 0.1 to 6 μm).

[0040] These photochromic particles can be made to be colorless in an indoor lighting environment (such as incandescent lamps, fluorescent lamps, lamps, or white LEDs used indoors) and to develop color in an ultraviolet irradiation environment (irradiation with wavelengths of 200-400 nm, or sunlight including ultraviolet light).

[0041] In the present invention (including examples), the "average particle diameter" is appropriately selected depending on the size of the particles to be measured. For particles less than approximately 1 μm, it is the histogram average particle diameter (D50) value calculated on a volume basis in the scattering intensity distribution measured by dynamic light scattering. For particles of 1 μm or larger, it is the median diameter (D50) value calculated on a volume basis in laser diffraction. The average particle diameter can be measured using a particle size analyzer [Microtrac HRA9320-X100 (Nikkiso Co., Ltd.)].

[0042] Examples of methods for microencapsulating the above-mentioned thermochromic pigments and photochromic particles include interfacial polymerization, interfacial polycondensation, insitu polymerization, liquid curing coating, phase separation from aqueous solutions, phase separation from organic solvents, melt-dispersion cooling, air suspension coating, and spray drying, and can be appropriately selected depending on the application.

[0043] For example, in a phase separation method from an aqueous solution, a thermochromic microcapsule pigment can be produced by a method comprising the following steps, particularly a method comprising the following steps in this order: (1) Heat and melt the leuco dye, developer, and color change temperature adjuster. (2) Add the heated and melted leuco dye, developer, and color change temperature adjuster to the emulsifier solution, heat and stir to disperse them into oil droplets, and prepare a dispersion. (3) To obtain a thermochromic microcapsule pigment by gradually adding a resin raw material capable of forming a wall film, such as a urethane resin, epoxy resin, or amino resin, for example, an amino resin solution, specifically an amino resin solution such as an aqueous methylolmelamine solution, urea solution, or benzoguanamine solution, to the above dispersion and reacting the resin raw material to form a capsule film, and (4) Filter the dispersion containing the thermochromic microcapsule pigment.

[0044] In this thermochromic pigment, the color development temperature and decolorization temperature of each color can be set to a suitable temperature by appropriately combining the types and amounts of leuco dyes, developer agents, and color change temperature adjusters.

[0045] These colorants can be used individually or in mixtures of two or more. Furthermore, the average particle size of these colorants, including water-dispersible pigments, resin particle pigments, pseudo-pigments, white plastic pigments, multi-layer coated pigments, thermochromic pigments, and photochromic particles, varies depending on the ball diameter, ink composition, viscosity, etc., but an average particle size of 0.02 to 6 μm is desirable. This average particle size may be, for example, 0.02 μm or more, 0.05 μm or more, 0.07 μm or more, 0.10 μm or more, 0.20 μm or more, 0.30 μm or more, 0.50 μm or more, 0.70 μm or more, or 0.90 μm or more, and may also be 6 μm or less, 5 μm or less, 4 μm or less, 3 μm or less, 2 μm or less, or 1 μm or less.

[0046] The content of these colorants can be appropriately increased or decreased depending on the ink line density, but may be 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, 0.9% by mass or more, or 1.0% by mass or more, relative to the total amount of the aqueous ink composition, and preferably 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less.

[0047] (Adhesive resin component) The adhesive resin component is a resin used, as needed, for viscosity adjustment and to improve adhesive strength. Examples of adhesive resins that can be used include water-soluble resins and resin emulsions. These adhesive resins may be used individually or in combination.

[0048] As water-soluble resins, for example, water-soluble resins having hydrophobic parts within the molecule can be used, such as polyacrylic acid, water-soluble styrene-acrylic resin, water-soluble styrene-maleic acid resin, polyvinyl alcohol, polyvinylpyrrolidone, water-soluble maleic acid resin, water-soluble styrene resin, water-soluble ester-acrylic resin, ethylene-maleic acid copolymer, polyethylene oxide, and water-soluble urethane resin.

[0049] As the resin emulsion, at least one selected from, for example, polyolefin emulsions, acrylic emulsions, vinyl acetate emulsions, urethane emulsions, styrene-butadiene emulsions, and styrene-acrylonitrile emulsions can be used.

[0050] From the viewpoint of obtaining good adhesion of the writing instrument ink, the content of the adhesive resin component is preferably 3% or more by mass, 4% or more by mass, 5% or more by mass, or 6% or more by mass, relative to the mass of the writing instrument ink, and from the viewpoint of obtaining appropriate viscosity of the writing instrument ink, it is preferable that it is 20% or less by mass, 15% or less by mass, or 12% or less by mass.

[0051] (Surfactants) As surfactants, for example, nonionic surfactants, cationic surfactants, anionic surfactants, etc., can be used, and among these, the use of nonionic surfactants is preferred from the viewpoint of obtaining the above-mentioned contact angle.

[0052] Suitable nonionic surfactants include, for example, fluorine-based surfactants, acetylene-based surfactants, and silicone-based surfactants.

[0053] The surfactant content may be 0.1% by mass or more, 0.2% by mass or more, or 0.3% by mass or more, relative to the mass of the writing instrument ink, and is preferably 1.0% by mass or less, 0.9% by mass or less, 0.8% by mass or less, or 0.7% by mass or less, from the viewpoint of obtaining the above contact angle.

[0054] (Other ingredients) Other ingredients that can be used include, for example, pH adjusters, viscosity modifiers, and preservatives.

[0055] <Packaging container> In the present invention, the packaging container is a packaging container that contains the above-mentioned ink for writing instruments. This packaging container may consist only of an ink storage section, or it may have other components.

[0056] Furthermore, the packaging container of the present invention may take the form of a writing instrument. In this case, other components may include, for example, a writing part. One embodiment of the packaging container of the present invention that is a writing instrument will be described with reference to the drawings.

[0057] <Writing instruments> As shown in Figures 1 and 2, the packaging container 100 of the present invention may have an ink storage section 10, a writing section 20, a cap section 30, and a spout section 40.

[0058] According to this embodiment of the packaging container 100, as shown in Figure 3, writing can be performed with the writing part 20 pressed against the writing surface 200.

[0059] (Ink reservoir) The ink reservoir is the component that contains the ink.

[0060] The ink reservoir comprises at least a paper layer and an inner resin layer that is in contact with the ink for water-based writing instruments.

[0061] The ink reservoir is composed of a laminate having at least a paper layer and an inner resin layer. The ink reservoir can be manufactured, for example, by forming a carton blank 10a, as shown in Figure 4, which is composed of the above-mentioned laminate, into a cylindrical shape by folding the solid lines in Figure 4 as mountain folds and the dashed lines as valley folds, and then bonding the ends together. For specific manufacturing methods, please refer to the description in Patent Document 4.

[0062] (Ink reservoir: paper layer) As the paper layer, a paper layer commonly used in paper containers can be used.

[0063] (Ink storage area: inner resin layer) The inner resin layer is a resin layer that comes into contact with the ink used for water-based writing instruments.

[0064] The resin constituting the inner resin layer can be, for example, polyolefin resins, ketone resins, sulfamide resins, maleic acid resins, terpene resins, terpene phenol resins, ester gums, xylene resins, alkyd resins, phenol resins, rosin, polyvinylpyrrolidone, polyvinyl butyral, polyvinyl alcohol, acrylic resins, urethane resins, melamine resins, cellulose resins, and derivatives thereof.

[0065] Polyolefin resins such as polyethylene and polypropylene can be used.

[0066] The arithmetic mean roughness Sa of the surface of the inner resin layer in contact with the water-based writing instrument ink, measured in accordance with ISO 25178, may be 50 μm or less, 40 μm or less, 30 μm or less, 20 μm or less, or 10 μm or less, and may also be 1 μm or more, 3 μm or more, or 5 μm or more.

[0067] (Ink storage section: other layers) Other layers that can be used include a barrier layer, an adhesive layer, and so on.

[0068] As the barrier layer, metal foil layers such as aluminum foil, metal vapor-deposited layers such as aluminum oxide vapor-deposited films, silica layers, etc., can be used. These layers may be laminated separately to the paper layer or inner resin layer, or they may be pre-laminated to the paper layer or inner resin layer.

[0069] For the adhesive layer, for example, a dry laminate adhesive can be used.

[0070] (writing department) As shown in Figure 5, the writing section 20 may have an ink supply section 22 and a connecting section 24.

[0071] The ink supply unit is joined to the joint and may have a structure that allows ink to be supplied from the ink storage unit, for example, by capillary action. Examples of ink supply units include those made by molding a core used in general writing instruments, such as a fiber core or a plastic core, into a shape that can be fitted into the joint.

[0072] The fiber core is a core made by processing a fiber bundle such as felt, or by resin processing a fiber bundle made from one or more types of materials such as natural fibers, animal hair fibers, polyacetal resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether resin, or polyphenylene resin, or a combination of two or more types of materials.

[0073] A plastic core is a core in which an ink groove is formed along the long axis of a rod-shaped resin for supplying ink from an ink reservoir. This rod-shaped resin may be made of the resins mentioned in relation to the fiber core.

[0074] The joint is the part that connects the writing section to the stopper section. This allows only the writing section to be removed from the stopper section. With this configuration, when the writing section becomes worn, only the writing section can be replaced with a new one, and when the ink in the container is used up, the writing section can be reused by attaching a new ink reservoir filled with ink, and the ink reservoir can also be reused repeatedly.

[0075] (Cap part) The cap portion is a component that conceals the writing section. As shown in Figure 6, the cap portion 30 may have a connecting portion 32 for connecting to the outer connecting portion 46 of the mouthpiece portion 40, or, although not shown, a structure for connecting to the writing section.

[0076] The joint is the part that connects the cap to the outer joint of the stopper. This joint may be a part that allows for joining by fitting or screwing.

[0077] (Spout part) The spout portion may be connected to the ink reservoir portion. As shown in Figure 7, the spout portion 40 may be made of a single component and may have an opening 42, an internal joint portion 44, and an external joint portion 46.

[0078] The opening is for supplying ink from the ink reservoir to the ink supply section of the writing unit. Through this opening, ink can be refilled in the ink reservoir or poured into another container.

[0079] The internal joint is the part that connects the writing section to the mouthpiece section. The external joint is the part that connects the cap section to the mouthpiece section. These joints may be parts that allow for joining by fitting or screwing. [Examples]

[0080] The present invention will be specifically described by examples and comparative examples, but the present invention is not limited thereto.

[0081] 《Preparation of ink for writing instruments》 The materials shown in Table 1 were mixed in the amounts shown in Table 1 to prepare the writing instrument inks for Examples 1-6 and Comparative Examples 1-2.

[0082] Details of each component are as follows: Titanium dioxide: Titanium dioxide, CR-95, Ishihara Sangyo Co., Ltd.) CB: Carbon Black, MCF88, Mitsubishi Chemical Corporation Blue dye: Phthalocyanine Blue 5187, Dainichi Seika Kogyo Co., Ltd. Red dye: FUJI RED 2510, Fuji Pigment Co., Ltd. Pink dye: Pink, NKW3207E, Nippon Fluorescent Co., Ltd. Thermochromic MC: Black, thermochromic microcapsule pigment (3μm) Styrene-acrylic: Joncryl 63J, BASF Styrene male: Alastor 703S, Arakawa Chemical Corporation Acrylic: JONCRYL 6102B, BASF Urethane emulsion: WBR-016U, Taisei Fine Chemical Co., Ltd. PE Emulsion: Chemipearl W500, Mitsui Chemicals, Inc. Fluorine-based: Futergent 251, Neos Co., Ltd. Acetylene-based A: Acrylic-based Surfinol 2502, Nisshin Chemical Industry Co., Ltd. Acetylene-based B: Olphine EXP.4200, Nisshin Chemical Industry Co., Ltd. Silicone-based: BYK345, Bic Chemie Inc.

[0083] Evaluation of the physical properties of ink To evaluate the physical properties of the ink, an evaluation laminate having a paper layer and an inner resin layer was prepared. A polyethylene film with a surface roughness of 5.4 μm was used as the inner resin layer.

[0084] Under conditions of 25°C, 60% humidity, and atmospheric pressure (1 atm), 1 μl of the prepared ink was dropped onto the polyethylene film described above. 5000 ms later, the contact angle between the writing instrument ink and the inner resin layer was measured using the θ / 2 method.

[0085] Furthermore, the static surface tension of the prepared water-based writing instrument ink was measured using the Wilhelmy method with a platinum plate under conditions of 25°C, 60% humidity, and atmospheric pressure (1 atm).

[0086] "evaluation" <Container cleanability> 0.1 ml of the prepared ink was dropped onto the inner resin layer of the laminate for the ink reservoir under conditions of 25°C and 60% humidity, and then left in this environment for 5 minutes. Next, the portion of the inner resin layer to which the ink had adhered was immersed in water for 10 minutes. The evaluation criteria are as follows. A: There was absolutely no ink residue left. B: A slight ink stain remained. C: Ink stains remained.

[0087] <Water-resistant adhesion of drawn lines> Under conditions of 25°C and 65% humidity, a spiral line was drawn on a PET film (Lumirror® #100, Toray Industries, Inc.) using the prepared writing instrument, and then left to stand for 1 hour. Next, tap water was sprayed onto the line at a flow rate of 12 liters per minute from a commercially available shower nozzle, and the condition of the line was visually inspected. The evaluation criteria are as follows. A: No change was observed in the lines drawn. B: The hue of the lines sometimes became slightly lighter, or parts of the lines were missing. C: The hue of the drawn lines sometimes became significantly lighter, or more than half of the drawn lines were missing. D: All the lines had smudged and disappeared.

[0088] Table 1 shows the configurations and evaluation results of the examples and comparative examples.

[0089] [Table 1]

[0090] Table 1 shows that the ink packaging containers obtained using the ink and inner resin layer combinations of Examples 1 to 6, in which the contact angle between the writing instrument ink and the inner resin layer is 10° or more, possess both excellent washability and water resistance of the lines drawn. [Explanation of symbols]

[0091] 100 ink packaging containers 10. Ink storage compartment 10a Carton blanks that make up the ink storage section 20 Writing section 22 Ink supply unit 24 Joint 30 Cap section 32 Joint 40 Spout part 42 Opening 44 Internal joint 46 External joint 200 pages

Claims

1. An ink packaging container filled with water-based writing instrument ink, The aforementioned water-based writing instrument ink contains a water-based solvent, a colorant, and a fixing resin component. The ink packaging container has at least an ink storage portion having a paper layer and an inner resin layer in contact with the water-based writing instrument ink, and After 5000 ms, when 1 μl of the water-based writing instrument ink is dropped onto the inner resin layer, the contact angle between the water-based writing instrument ink and the inner resin layer is 10° or more. Ink packaging container.

2. The ink packaging container according to claim 1, wherein the surfactant content in the water-based writing instrument ink is less than 1.0% by mass relative to the mass of the water-based writing instrument ink.

3. The ink packaging container according to claim 1 or 2, wherein the static surface tension of the water-based writing instrument ink is 18 mN / m or more.

4. The ink packaging container according to claim 1 or 2, wherein the adhesive resin component is an acrylic resin or a urethane resin.

5. The ink packaging container according to claim 1 or 2, wherein the coloring material is a pigment.

6. The ink packaging container according to claim 1 or 2, wherein the inner resin layer is a polyolefin resin.

7. The ink packaging container according to claim 1 or 2, wherein the arithmetic mean roughness Sa of the surface of the inner resin layer in contact with the water-based writing instrument ink, as measured in accordance with ISO 25178, is 50 μm or less.

8. An ink packaging container according to claim 1 or 2, which is a writing instrument.

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