Applicator

Abstract

To provide an applicator capable of drawing a double line in one stroke and preventing leakage of a coating liquid for a long period of time.SOLUTION: An applicator 1 has a main body tube 2, a first pen tip member 3, and a second pen tip member 5. A first core 8 and a second core 9 are housed inside the main body tube 2. A rear end portion 3b of the first pen tip member 3 is in contact with the first core 8, and a first application liquid is supplied to the first pen tip member 3. A rear end portion 5b of the second pen tip member 5 is in contact with the second core 9, and a second application liquid is supplied to the second pen tip member 5. The first application liquid is made of an aqueous first ink composition containing a first wetting agent, and the second application liquid is made of an aqueous second ink composition containing a second wetting agent. When the concentration of the first wetting agent in the first ink composition is A% by weight and the concentration of the second wetting agent in the second ink composition is B% by weight, the absolute value X1 of the difference between A and B is 0 to 17.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an applicator for applying a coating liquid to an object such as paper. [Background technology]

[0002] There are widely known applicators having a pen tip made of felt, synthetic resin, etc., such as a so-called marking pen. Among such applicators, there is an applicator that is capable of drawing a double line with one stroke of the brush.

[0003] Patent Document 1 discloses a marking pen in which a pen tip section for drawing wide lines and a pen tip section for drawing narrow lines are arranged side by side in close proximity on a straight line. In this marking pen, there is a gap between the tip of the pen tip section for drawing wide lines and the tip of the pen tip section for drawing narrow lines. Therefore, when a line is drawn on a paper surface or the like, the drawn line becomes two lines that extend parallel to each other with a gap between them. This marking pen also has two ink occlusion bodies (11)(11)' in which different inks are stored. Ink is supplied from the ink occlusion body (11) to the pen tip section for drawing wide lines, and from the ink occlusion body (11)' to the pen tip section for drawing narrow lines.

[0004] Patent Document 2 discloses an applicator including a main body, a first pen tip member, a second pen tip member, a first ink occlusion body, and a second ink occlusion body. In this applicator, the first ink occlusion body and the second ink occlusion body are impregnated with different inks. Then, ink is supplied from the first ink occlusion body to the first pen tip member, and from the second ink occlusion body to the second pen tip member. In this applicator, the first pen tip member and the second pen tip member are not in contact with each other, and a double line can be drawn with a single stroke.

[0005] Patent Document 3 discloses a core-type multi-color marking pen with a single-axis pen tip. Patent Document 4 discloses a multi-color marker with a single-axis pen tip. These marking pens / markers have two ink occlusion bodies, but because the pen tip is single-axis, the drawn line is multi-colored but forms a single line. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 01-258999 [Patent Document 2] JP 2022-167426 A [Patent Document 3] JP 2004-27081 A [Patent Document 4] JP 2000-43469 A Summary of the Invention [Problem to be solved by the invention]

[0007] In general, in applicators such as marking pens that have an ink occlusion body (core), ink leakage from the core should not occur. This is true not only when the writing instrument is in use (when writing), but also when it is not in use (during storage). Furthermore, the same is true for applicators that have multiple cores as described above. Therefore, an object of the present invention is to provide an applicator that has multiple cores and that is highly prevented from leaking coating liquid from the cores. [Means for solving the problem]

[0008] The present inventors have found several problems in the process of developing a water-based marking pen with a core that can draw a double line with one stroke. As one of the problems, the inventors have confirmed a phenomenon in which a small amount of coating liquid leaks from the coating liquid occlusion body (core) when the marking pen is stored for a long period of time. This phenomenon was not confirmed in a marking pen that has one pen tip and can draw one line, and was considered to be a phenomenon unique to water-based marking pens that can draw a double line with one stroke. Then, after repeated studies to find a solution, the inventors have found that the above problem can be solved by devising the composition of the ink contained in each core.

[0009] One aspect of the present invention is an applicator having a plurality of applicator bodies, and applying an application liquid by contacting a tip portion of the applicator body with an object to be applied, the plurality of applicator bodies including a first applicator body for applying a first application liquid and a second applicator body for applying a second application liquid, the first applicator body and the second applicator body having their tip portions arranged side by side without contacting each other, the first applicator body and the second applicator body having a first application liquid occlusion body containing the first application liquid and a second application liquid occlusion body containing the second application liquid, the first applicator body being in contact with the first application liquid occlusion body, whereby the first application liquid is supplied to the first applicator body, and the second applicator body being in contact with the first application liquid occlusion body. is in contact with the second coating liquid occlusion body, thereby supplying the second coating liquid to the second coating body portion, the first coating liquid consisting of an aqueous first ink composition containing a first humectant, the second coating liquid consisting of an aqueous second ink composition containing a second humectant, at least one of the first humectant and the second humectant contains at least a humectant other than glycerin, and when a concentration of the first humectant in the first ink composition is A % by weight and a concentration of the second humectant in the second ink composition is B % by weight, an absolute value X1 of a difference between A and B is 0 to 17.

[0010] This aspect relates to an applicator having a plurality of applicator parts, and applying a coating liquid by contacting the tip of the applicator part with an object to be coated. In the applicator of this aspect, the plurality of applicator parts include a first applicator part for applying a first coating liquid and a second applicator part for applying a second coating liquid, and the tip parts are arranged side by side without contacting each other. Therefore, a double line can be drawn with one stroke. In addition, the applicator has a first coating liquid occluder containing the first coating liquid, and the first applicator part is in contact with the first coating liquid occluder. Similarly, the applicator has a second coating liquid occluder containing the second coating liquid, and the second applicator part is in contact with the second coating liquid occluder. In this aspect, the difference in the wetting agent concentration (wt%) between the first ink composition constituting the first coating liquid and the second ink composition constituting the second coating liquid is within a specific range. According to this aspect, it is possible to provide an applicator in which ink leakage from the coating liquid occluder is highly suppressed even after long-term storage.

[0011] Preferably, the first wetting agent is at least one selected from the group consisting of urea, a dihydric alcohol, and a trihydric alcohol, and the second wetting agent is at least one selected from the group consisting of urea, a dihydric alcohol, and a trihydric alcohol.

[0012] Preferably, the first humectant comprises at least glycerin and the second humectant comprises at least glycerin.

[0013] Preferably, when the glycerin concentration in the first ink composition is C % by weight and the glycerin concentration in the second ink composition is D % by weight, an absolute value X2 of the difference between C and D is 0-17.

[0014] With this configuration, it is possible to provide an applicator that prevents the phenomenon of only one side of the drawn line becoming smudged even after long-term storage, and maintains high writing performance.

[0015] Preferably, at least one of the first wetting agent and the second wetting agent comprises urea.

[0016] Preferably, the concentration of the first wetting agent in the first ink composition is 1 to 50% by weight.

[0017] Preferably, the concentration of the second wetting agent in the second ink composition is 1 to 50% by weight. Effect of the Invention

[0018] According to the present invention, in an applicator equipped with two central cores, leakage of application liquid from the central cores can be prevented even after long-term storage. [Brief description of the drawings]

[0019] [Figure 1] 1 is an explanatory diagram showing a longitudinal cross section of a core and an applicator body in an applicator according to one embodiment of the present invention. FIG. [Diagram 2]FIG. 2 is an explanatory diagram illustrating a schematic diagram of an applicator body of the applicator in FIG. 1 and a double line drawn using the applicator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] First, the basic configuration of the applicator will be described with reference to the drawings. In order to facilitate understanding of the invention, the size and thickness of each component in each drawing are partially exaggerated and may not necessarily correspond to the actual size, ratio, etc. Also, in Figure 1, hatching is omitted for some components.

[0021] An applicator 1 according to one embodiment of the present invention shown in Figures 1 and 2 belongs to the so-called water-based marking pen. The applicator 1 has a main body tube 2, a first pen tip member 3 (first application body part), and a second pen tip member 5 (second application body part). Inside the main body tube 2, a first center core 8 (first application liquid occluder) and a second center core 9 (second application liquid occluder) are housed.

[0022] The cylindrical main body 2 is a hollow cylindrical member. A space is formed inside the cylindrical main body 2 over the entire longitudinal direction.

[0023] The first pen tip member 3 is a wide tip for drawing thick lines 6 (FIG. 2). The first pen tip member 3 is, for example, a sintered core (porous body) formed by applying heat to a powder such as a plastic powder, and is a porous body having continuous pores. In other words, it is a member that can absorb the first application liquid by capillary action and move it to the pen tip side (front side). Alternatively, the first pen tip member 3 can be made of felt.

[0024] The second pen tip member 5 is a rod-shaped, narrow tip for drawing thin lines 7 (FIG. 2). The second pen tip member 5 is formed, for example, by extruding and stretching a synthetic resin having fine holes inside, leaving these holes. As the synthetic resin, for example, engineering plastic (polyacetal resin) is used. In other words, the second pen tip member 5 can be made of a plastic tip. Alternatively, the second pen tip member 5 can be made of a fiber bundle.

[0025] The first core 8 (first application liquid occluder) has a structure in which a batting 8a is packed into an elongated outer member, and the batting 8a is impregnated with the first application liquid. Similarly, the second core 9 (second application liquid occluder) has a structure in which a batting 9a is packed into an elongated outer member, and the batting 9a is impregnated with the second application liquid. The first core 8 and the second core 9 are independent of each other, and the batting 8a and the batting 9a do not come into contact with each other.

[0026] The rear end portion 3b of the first pen tip member 3 is in contact with the first center core 8, specifically with the batting 8a impregnated with the first application liquid. This allows the first application liquid to be supplied to the first pen tip member 3. Similarly, the rear end portion 5b of the second pen tip member 5 is in contact with the second center core 9, specifically with the batting 9a impregnated with the second application liquid. This allows the second application liquid to be supplied to the second pen tip member 5.

[0027] When using the applicator 1 to draw lines 6, 7 on a coating target 10 such as paper, the tip portion 3a of the first pen tip member 3 and the tip portion 5a of the second pen tip member 5 are moved while in contact with the coating target 10, as shown in Fig. 2. At this time, the tip portions 3a, 5a of the first pen tip member 3 and the second pen tip member 5 are not in contact with each other, so the thick drawn line 6 and thin drawn line 7 do not overlap but form parallel double lines.

[0028] In the embodiment shown in Figures 1 and 2, a wide tip is used as the first pen tip member 3 and a narrow tip is used as the second pen tip member 5, but there is no master-slave relationship between the first pen tip member 3 and the second pen tip member 5, and the combination of the wide tip and the narrow tip may be reversed, or equivalent tips may be used for both.

[0029] Next, the first ink composition and the second ink composition will be described. Note that, matters common to the first ink composition and the second ink composition will be collectively referred to as the ink composition.

[0030] The ink composition of the present embodiment is an aqueous ink composition, and contains at least a solvent, a colorant, and a wetting agent.

[0031] As the solvent, water is usually used. The content of water in the entire ink composition is, for example, 1 to 60% by weight, and preferably 5 to 50% by weight. The solvent may contain a water-soluble organic solvent, for example, butyl cellosolve.

[0032] As the colorant, pigments, dyes, colored resin particles, etc. can be used. Examples of pigments include organic pigments such as phthalocyanine, azo, quinacridone, anthraquinone, dioxane, indigo, thioindigo, perinone, perylene, indolenone, and azo-azomethine; inorganic pigments such as titanium oxide, carbon, aluminum powder pigment, glass flake, mica, and pearl pigment. The content of the pigment in the ink composition (the content ratio of the pigment to the entire ink composition) is, for example, 0.5 to 35% by weight, preferably 1 to 30% by weight. If the content of the pigment is too high, the viscosity of the ink composition may increase, and the outflow of the ink may be deteriorated. If the content of the pigment is too low, the color development and hiding power of the ink may be deteriorated.

[0033] When a pigment is used as a colorant, it is preferable to include a dispersant to stabilize the dispersion of the pigment. Examples of dispersants include styrene-acrylic resins, styrene-based resins, and acrylic-based resins. These dispersants stabilize the dispersion of the pigment and also have the function of imparting adhesion to the pigment. The content of the dispersant in the ink composition is, for example, 0.1 to 20% by weight, preferably 0.5 to 15% by weight. If the content of the dispersant is too high, the viscosity of the ink composition may increase, and the outflow of the ink may become poor. If the content of the dispersant is too low, the viscosity of the ink composition may decrease, and the adhesion of the pigment may become poor.

[0034] Examples of dyes include various dyes such as acridine, aniline, anthraquinone, azine, azo, azomethine, benzoquinone, naphthoquinone, indigoid, indophenol, indoaniline, indamine, leuco, naphthalimide, nigrosine, induline, nitro, nitroso, oxazine, dioxazine, oxidation dye, phthalocyanine, polymethine, quinophthalone, sulfide dye, triarylmethane, diallylmethane, thiazine, thiazole, and xanthene. The content of the dye in the ink composition is, for example, 0.5 to 35% by weight, preferably 1 to 30% by weight. If the content of the dye is too high, the viscosity of the ink composition may increase, and the outflow of the ink may be deteriorated. If the content of the dye is too high, the color development and hiding power of the ink may be deteriorated.

[0035] As the colorable resin particles, resin spheres such as spherical ones colored with any pigment or dye can be used. Examples of the colorable resin particles include Lumikol NKW-3907E (manufactured by Nippon Kinko Kagaku Co., Ltd., resin: styrene-acrylonitrile copolymer, dye: CI Basic Violet 11:1, CI Basic Red 1:1), Lumikol NKW-3905E (manufactured by Nippon Kinko Kagaku Co., Ltd., resin: styrene-acrylonitrile copolymer, dye: CI Basic Yellow 40), and Lumikol NKW-3908E (manufactured by Nippon Kinko Kagaku Co., Ltd., resin: styrene-acrylonitrile copolymer, dye: CI Basic Blue 3). The content of the colorable resin particles in the ink composition is, for example, 0.5 to 35% by weight, preferably 1 to 30% by weight. If the content of the colorable resin particles is too high, the viscosity of the ink composition may increase, which may cause poor ink outflow. If the content of the colorable resin particles is too high, the color development and hiding power of the ink may deteriorate.

[0036] When colored resin particles are used as the colorant, non-colored resin spheres may be further included. Examples of such resin spheres include Lumikol NKW-85E (Nihon Kinko Kagaku Co., Ltd., styrene-acrylonitrile polymer), Tuftic AR650SX (Nihon Exlan Kogyo Co., Ltd., polymethyl methacrylate), etc.

[0037] To produce thick and thin lines 6 and 7 (FIG. 2) of different colours, it is preferred to use different colourants in the first and second ink compositions.

[0038] The ink composition of the present embodiment includes a wetting agent. In detail, the first ink composition includes a first wetting agent, and the second ink composition includes a second wetting agent. Examples of wetting agents include urea, dihydric alcohols, and trihydric alcohols. Examples of dihydric alcohols include ethylene glycol, propylene glycol, diethylene glycol, polyalkylene glycol, and the like. Examples of trihydric alcohols include glycerin. Examples of other wetting agents include alkylene glycol monoalkyl ethers and the like. These wetting agents may be used alone or in combination of two or more. The compositions of the first wetting agent and the second wetting agent may be the same or different. However, this does not include the case where both the first wetting agent and the second wetting agent are composed of only glycerin.

[0039] The concentration of the humectant in each ink composition (the content ratio of the humectant to the entire ink composition, the content of the humectant in the ink composition) is, for example, 1 to 50% by weight, preferably 5 to 30% by weight. If the content of the humectant is too high, the viscosity of the ink composition may increase, which may cause the ink to flow poorly. In addition, the ink may dry slowly, which may cause handwriting to become sticky. If the content of the humectant is too low, the pen tip may dry out easily, which may cause smearing during writing.

[0040] In this embodiment, the difference between the concentration of the first wetting agent in the first ink composition and the concentration of the second wetting agent in the second ink composition is within a predetermined range. Specifically, when the concentration of the first wetting agent in the first ink composition is A% by weight and the concentration of the second wetting agent in the second ink composition is B% by weight, the absolute value X1 of the difference between A and B is 0 to 17 (0 or more and 17 or less). Since the absolute value X1 is set within a predetermined range, the applicator 1 of this embodiment can highly suppress ink leakage from the center core even when stored for a long period of time.

[0041] It is preferable that both the first wetting agent and the second wetting agent contain at least glycerin. In a more preferred embodiment, when the glycerin concentration in the first ink composition is C weight % and the glycerin concentration in the second ink composition is D weight %, the absolute value X2 of the difference between C and D is 0 to 17 (0 to 17). The absolute value X2 is preferably 0 to 12, more preferably 0 to 7, even more preferably 0 to 3, and particularly preferably 0 to 1. By setting the absolute value X2 within the above range, the applicator 1 of this embodiment can highly suppress ink leakage from the center core, and can maintain high writing performance by suppressing the phenomenon that only one side of the drawn line is smudged even after long-term storage.

[0042] Preferably, at least one of the first wetting agent and the second wetting agent comprises urea.

[0043] The ink composition of the present invention may contain components other than those described above, so long as the components do not impair the performance of the ink composition. Examples of such components include thickeners, thixotropic agents, activators, mildew inhibitors, preservatives, defoamers, and leveling agents. EXAMPLES

[0044] First, an experimental example regarding ink smudging will be described as Example 1.

[0045] Example 1 1. Preparation of the first ink composition (Ink A) Six types of water-based ink compositions (inks A1 to A6) with different glycerin concentrations were prepared according to the formulation (unit: parts by weight) shown in Table 1. Specifically, a colored resin particle dispersion (Lumikol NKW-3907E; Nippon Kinko Kagaku Co., Ltd.), a resin particle dispersion (Lumikol NKW-85E; Nippon Kinko Kagaku Co., Ltd.), and glycerin were added to ion-exchanged water and stirred with a resolver blade for 60 minutes. Furthermore, a preservative (Proxel XL-2; Arch Chemicals Japan Co., Ltd.) and a mildewproofing agent (Courtside PH2; Osaka Gas Chemicals Co., Ltd.) were added and stirred for 10 minutes to obtain inks A1 to A6.

[0046] [Table 1]

[0047] 2. Preparation of the second ink composition (Ink B) Four types of water-based ink compositions (inks B1 to B4) with different glycerin concentrations were prepared with the formulation (unit: parts by weight) shown in Table 2. Specifically, 20% resin liquid (Hi-Loss X-1; Seiko PMC Co., Ltd.), ethylene glycol, water, and butyl cellosolve were mixed and stirred for 10 minutes. Furthermore, a pigment (Shimura Fast Red 4127, naphthol azo pigment) was added and stirred for 120 minutes, and then the mixture was degassed by stirring at low speed overnight. This was treated with a continuous Dyno Mill and dispersed until the target particle size was reached. Ion-exchanged water, a preservative (Proxel XL-2), and a mold inhibitor (Courtside PH2) were added to this and stirred for 10 minutes to obtain a pigment dispersion. The pigment dispersion, an activator (Phosphanol PE-510; Toho Chemical Industry Co., Ltd.), a preservative, and a mold inhibitor were added to the ion-exchanged water and stirred for 10 minutes to obtain inks B1 to B4.

[0048] [Table 2]

[0049] 3. Making a marking pen A marking pen was produced that had two independent internal cores (first internal core, second internal core) built in and was equipped with a wide tip (first pen tip portion) and a narrow tip (second pen tip portion) whose tips did not contact each other. The first internal core was filled with a first ink composition (inks A1 to A6), and the first ink composition was supplied to the wide tip. The second internal core was filled with a second ink composition (inks B1 to B4), and the second ink composition was supplied to the narrow tip. A flat or square tip made of felt was used as the wide tip. A round tip made of a fiber bundle was used as the narrow tip. The two internal cores filled with the ink compositions were attached to the main body, and then the tips, tip plugs, and caps were attached.

[0050] 4.Storage stability test Each marking pen was stored with the cap attached at a specified temperature and in a specified position for one month, and changes in writing properties (smudges) were evaluated. Four temperature conditions were used: refrigeration, 40°C, 50°C, and a cycle of -10°C to 50°C (a cycle of -10°C → 50°C → -10°C was repeated over two days). Three positions were used: horizontal, upright, and inverted. As an evaluation method, first, before the start of the test, writing was done on writing paper to obtain a reference handwriting. For the writing method, five 10 cm straight lines were drawn with the broad side of the wide tip, and ten continuous circles with a diameter of 15 mm were drawn with the narrow tip. After the test was completed, writing was done in the same way adjacent to the reference handwriting to check the state of smudges. The evaluation criteria were as follows: A: Both the wide and narrow tips have no smudges from start to finish. B: At least one of the wide and narrow tips smudges at the beginning of writing, but returns to normal midway through writing. C: At least one of the wide and narrow tips remains smudged from the beginning to the end of writing.

[0051] 5.Results The results are shown in Table 3. In the following, for example, a marking pen that combines ink A1 and ink B1 will be expressed as "A1 / B1." "-" in Table 3 indicates that data was not obtained.

[0052] In the combinations A1 / B1, A2 / B2, A3 / B3, and A4 / B4, which have the same glycerin concentration, as well as the combinations A1 / B2, A2 / B3, A3 / B4, A2 / B1, A3 / B2, and A4 / B3, where the absolute value X2 of the difference in glycerin concentration (wt%) is 5, very good writability was maintained (rating: A).

[0053] In the combinations A1 / B3, A2 / B4, A3 / B1, A4 / B2, and A6 / B4, where the absolute value X2 of the difference in glycerin concentration (wt%) is 10, very good writability was maintained under refrigerated and 40°C conditions (evaluation: A). Good writability was also maintained under 50°C conditions (evaluation: B).

[0054] In the combinations A1 / B4, A4 / B1, and A5 / B3, in which the absolute value X2 of the difference in glycerin concentration (% by weight) was 15, good writability was maintained at 50° C. (evaluation: B).

[0055] In other combinations where the absolute value X2 of the difference in glycerin concentration (% by weight) was 20 or more, smudges occurred in the drawn line of the tip with the lower glycerin concentration at 50° C. (evaluation: C).

[0056] From the above, it was shown that good writability is maintained even after long-term storage as long as the absolute value X2 of the difference in glycerin concentration between ink A and ink B is at least within the range of 0 to 15. In particular, it was shown that very good writability is maintained as long as the absolute value X2 is within the range of 0 to 5.

[0057] [Table 3]

[0058] Example 2 An experimental example regarding ink leakage from the center core is described as Example 2.

[0059] 1. Preparation of the first ink composition (Ink A) Three types of water-based ink compositions (inks A11 to A13) with different glycerin concentrations were prepared according to the formulations (unit: parts by weight) shown in Table 4. Specifically, a colored resin particle dispersion (Lumikol NKW-3907E; Nippon Kinko Kagaku Co., Ltd.), a resin particle dispersion (Lumikol NKW-85E; Nippon Kinko Kagaku Co., Ltd.), and glycerin were added to ion-exchanged water and stirred with a resolver blade for 60 minutes. Furthermore, a preservative (Proxel XL-2; Arch Chemicals Japan Co., Ltd.) and a mildewproofing agent (Courtside PH2; Osaka Gas Chemicals Co., Ltd.) were added and stirred for 10 minutes to obtain inks A11 to A13.

[0060] [Table 4]

[0061] 2. Preparation of the second ink composition (Ink B) Eight kinds of water-based ink compositions (inks B11 to B18) with different concentrations of glycerin, ethylene glycol, and urea were prepared with the formulations (unit: parts by weight) shown in Table 5. Specifically, 20% resin solution (Hi-Loss X-1; Seiko PMC Co., Ltd.), ethylene glycol, urea, water, and butyl cellosolve were mixed and stirred for 10 minutes. Pigments (Shimura Fast Red 4127, naphthol azo pigment) were further added and stirred for 120 minutes, and then degassed by stirring at low speed overnight. This was treated with a continuous Dyno Mill and dispersed until the target particle size was reached. Ion-exchanged water, preservatives (Proxel XL-2), and antifungal agent (Coatside PH2) were added to this and stirred for 10 minutes to obtain a pigment dispersion. The pigment dispersion, an activator (Phosphanol PE-510; Toho Chemical Industry Co., Ltd.), a preservative, and an anti-mold agent were added to ion-exchanged water and stirred for 10 minutes to obtain inks B11 to B18.

[0062] [Table 5]

[0063] 3. Making a marking pen A marking pen was produced that had two independent internal cores (first internal core, second internal core) built in and had a wide tip (first pen tip portion) and a narrow tip (second pen tip portion) whose tips did not contact each other. The first internal core was filled with a first ink composition (inks A11 to A13), and the first ink composition was supplied to the wide tip. The second internal core was filled with a second ink composition (inks B11 to B18), and the second ink composition was supplied to the narrow tip. A flat or square tip made of felt was used as the wide tip. A round tip made of a fiber bundle was used as the narrow tip. The two internal cores filled with the ink compositions were attached to the main body, and then the tips, tip plugs, and caps were attached.

[0064] 4. Ink leakage evaluation Each marking pen was capped and stored upright at 50°C for 4 weeks. After storage, the first and second ink cartridges were checked for ink leakage. The evaluation criteria were as follows: A: No ink is leaking from any of the cores. B: Ink is leaking from one of the cores.

[0065] 5.Results Table 6 shows the combination of inks A and B, the wetting agent concentrations (weight %) in inks A and B, the absolute value X1 (weight %) of the difference in wetting agent concentrations between inks A and B, and the results of the ink leakage evaluation. Note that the wetting agent concentration in ink A in Table 6 is shown as the concentration of the total amount (glycerin + propylene glycol) including the propylene glycol contained in the resin particle dispersion used. The wetting agent concentrations in inks B11 to B18 are the combined concentrations of glycerin, ethylene glycol, and urea.

[0066] In the following description, for example, a marking pen that combines ink A11 and ink B11 will be represented as "A11 / B11."

[0067] No ink leakage from the center core occurred in the combinations A11 / B11 (X1=11.20), A11 / B12 (X1=15.20), A12 / B13 (X1=9.90), A12 / B14 (X1=2.40), and A13 / B15 (X1=2.50) (rating: A).

[0068] In the combinations A11 / B16 (X1=17.20), A11 / B17 (X1=19.20), and A11 / B18 (X1=21.20), ink leakage from the center core occurred (rating: B).

[0069] From the above, it was shown that if the absolute value X1 of the difference in wetting agent concentration between ink A and ink B is at least within the range of 2.40 to 15.20, ink leakage from the center core will not occur even after long-term storage.

[0070] [Table 6] [Explanation of symbols]

[0071] 1 Applicator 3 First pen tip member (applicator body, first applicator body) 3a Tip part 5 Second pen tip member (applicator body, second applicator body) 5a Tip part 8 First core (first coating liquid absorbing body) 9 Second core (second coating liquid absorbing body) 10. Coating target

Claims

1. An applicator having a plurality of applicator parts, the tip portions of the applicator parts being brought into contact with an object to be applied with a coating liquid, the plurality of application bodies include a first application body that applies a first application liquid and a second application body that applies a second application liquid; The first and second application bodies are arranged side by side without their tip portions contacting each other, a first coating liquid occluder containing the first coating liquid and a second coating liquid occluder containing the second coating liquid, the first application body is in contact with the first application liquid occlusion body, whereby the first application liquid is supplied to the first application body; the second application body is in contact with the second application liquid occlusion body, whereby the second application liquid is supplied to the second application body; the first coating liquid is an aqueous first ink composition containing a first wetting agent; the second coating liquid is an aqueous second ink composition containing a second wetting agent, At least one of the first humectant and the second humectant includes at least a humectant other than glycerin; an applicator, wherein, when a concentration of the first wetting agent in the first ink composition is A % by weight and a concentration of the second wetting agent in the second ink composition is B % by weight, an absolute value X1 of a difference between A and B is 0 to 17.

2. The first wetting agent is at least one selected from the group consisting of urea, a dihydric alcohol, and a trihydric alcohol; The applicator according to claim 1 , wherein the second wetting agent is at least one selected from the group consisting of urea, a dihydric alcohol, and a trihydric alcohol.

3. The first humectant includes at least glycerin, The applicator of claim 1 , wherein the second humectant comprises at least glycerin.

4. 4. The applicator according to claim 3, wherein, when a glycerin concentration in the first ink composition is C % by weight and a glycerin concentration in the second ink composition is D % by weight, an absolute value X2 of a difference between C and D is 0 to 17.

5. 5. The applicator of claim 1, wherein at least one of the first wetting agent and the second wetting agent comprises urea.

6. 5. The applicator according to claim 1, wherein a concentration of the first wetting agent in the first ink composition is 1 to 50% by weight.

7. 5. The applicator according to claim 1, wherein the concentration of the second wetting agent in the second ink composition is 1 to 50% by weight.

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