KR20170066264A - Ink for marking pen - Google Patents

Abstract

The present invention provides an ink for a marking pen, which contains a pigment, an alcohol, a glycol ether solvent, a resin, a plasticizer, and a smoothing agent and has a viscosity of 12 to 15 cP. The present invention has the advantage that it is applicable to various writing objects and marking pen types. Further, the present invention has an advantage that the properties such as writing performance and erasability are excellent.

Description

Ink for marking pen {Ink for marking pen}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink for a marking pen, and relates to various kinds of marking pens and an ink for a marking pen applicable to a writing object.

The marking pen is also called a marker pen, a marker, a felt-tip pen, a board marker, etc. It is a writing instrument that has its own ink supply source and a pen with a pen tip.

Conventionally, a marking pen is also called a filter-type marking pen (see Korean Utility Model Registration No. 20-0178324, etc.) in such a manner that the filter absorbs ink and faded and moves the ink from the filter to the pen tip so as to be handwritten. In the case of the filter type, since the ink passes through the filter, there is a limitation in applying a large amount of ink, and since the filter itself absorbs the ink, it is difficult to deeply write the ink, there was.

Alternatively, the marking pen, which is also referred to as a tank type, is not applied with a filter, and ink is stored inside the pen body, which is also referred to as an ink tank, so that the ink in the ink tank moves to the pen tip . In case of the tank type, the disadvantage of the filter type can be overcome, but there is a problem that the erosion after a certain time is rather poor than the filter type.

In addition, the inks applicable to each type are not only incompatible with each other, but also have to overcome the disadvantages of each type.

Accordingly, it is necessary to develop an ink for a marking pen applicable to various kinds of marking pens.

On the other hand, it is necessary to develop an ink for a marking pen which can be easily applied not only to a light writing writing object such as a white board but also to a light writing writing object such as a matte sheet.

Korean Utility Model Registration No. 20-0178324, Apr. 15, 2000, Drawing 1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a marking pen of various kinds and an ink for a marking pen applicable to a writing object.

Hereinafter, another technical problem not mentioned in the above technical object will be apparent to those skilled in the art from the following description.

The present invention provides an ink for a marking pen having a viscosity of 12 to 15 cP (centi-poise), comprising a pigment, an alcohol, a glycol ether solvent, a resin, a plasticizer and a smoothing agent.

The pigment may be at least one selected from the group consisting of azo pigments, condensed azo pigments, anthraquinone pigments, perylene pigments, perinone pigments, indigo pigments, thioindigo pigments, isoindolinone pigments, azomethine pigments, quinacridone pigments, Phthalocyanine blue, dioxazine violet, aniline black, and carbon black.

The pigment may be contained in an amount of 5 to 8% by weight based on the total weight of the ink.

The resin may be a film-forming resin.

The film-forming resin may be a resin that forms a film at room temperature.

The room temperature means 1 to 35 degrees Celsius.

The resin may be a resin dissolved in the alcohol and the glycol ether solvent.

The resin may be at least one selected from an ethylene vinyl acetate resin, a cellulose resin, an acrylic resin, a glycerol rosin ester resin, and a polyvinyl butyral resin.

The resin may have an average molecular weight of 20,000 to 25,000 g / mol.

The resin may be contained in an amount of 8 to 12% by weight based on the total weight of the ink.

The alcohol may be at least one selected from lower alcohols having 1 to 4 carbon atoms.

The alcohol may be at least one selected from isopropyl alcohol or normal propyl alcohol and ethyl alcohol.

The alcohol may be contained in an amount of 45 to 63% by weight, more preferably 50 to 63% by weight, based on the total weight of the ink.

The solvent of the glycol ethers may be one or more selected from ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and propylene glycol monoethyl ether.

The glycol ether solvents may have a viscosity of 2.0 to 6.0 cP.

The glycol ether solvents may be contained in an amount of 5 to 7% by weight based on the total weight of the ink.

The plasticizer may be at least one selected from a benzoate-based plasticizer, a phthalate-based plasticizer, and a citrate-based plasticizer.

The plasticizer may be contained in an amount of 10 to 20% by weight based on the total weight of the ink.

The smoothing agent may be at least one selected from a silicone copolymer, a glycerin fatty acid ester, and a polyethylene wax.

The glycerin fatty acid ester may be a glycerin fatty acid ester having an HLB of 2.5 to 3.5.

The smoothing agent may be contained in an amount of 1 to 3% by weight based on the total weight of the ink.

The ink may further comprise at least one selected from oil, and a wetting agent.

The oil may be a vegetable oil.

The oil may be at least one selected from evening primrose oil, grape seed oil, castor oil, and olive oil.

The oil may be contained in an amount of 1 to 3% by weight based on the total weight of the ink.

The wetting agent may be at least one selected from a polyol, a polyhydric alcohol alkyl ether, and a polyhydric alcohol aryl ether.

The wetting agent may be contained in an amount of 1 to 3% by weight based on the total weight of the ink.

In addition, the ink may further include at least one selected from a dispersing agent and an anti-drying agent.

The dispersing agent may be a polymer dispersing agent.

The dispersing agent may be contained in an amount of 1 to 5% by weight based on the total weight of the ink.

The drying inhibitor may be at least one selected from among polyglycerin fatty acid esters, glycerin, sucrose fatty acid esters, sucrose stearic acid esters, and polyglycerin esters.

The drying inhibitor may be contained in an amount of 1 to 2% by weight based on the total weight of the ink.

Also, the alcohol may be contained in an amount of 45 to 63% by weight based on the total weight of the ink, and the glycol ether solvent may be included in an amount of 5 to 7% by weight.

The plasticizer may be contained in an amount of 10 to 20% by weight based on the total weight of the ink, and the smoothing agent may be included in an amount of 1 to 3% by weight.

Also, the pigment may be contained in an amount of 5 to 8% by weight based on the total weight of the ink, and the resin may be included in an amount of 8 to 12% by weight.

Further, the oil may be contained in an amount of 1 to 3 wt%, and the humectant may be contained in an amount of 1 to 3 wt% based on the total weight of the ink.

In addition, the dispersant may be contained in an amount of 1 to 5 wt% based on the total weight of the ink, and the drying inhibitor may be included in an amount of 1 to 2 wt%.

The present invention has the effect of being applicable to various writing objects and marking pen types. Further, the present invention has an effect that the properties such as writing performance and erasability are excellent.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will be more apparent from the following detailed description taken in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. But is only provided to fully inform the owner of the scope of the invention, and the present invention is only defined by the scope of the claims.

Throughout the specification, the term "and / or" includes each and every combination of one or more of the components mentioned.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

A "marking pen" is a writing instrument that has its own ink supply source and a pen tip, which makes it possible to erase it while allowing writing on a whiteboard, etc. It is meant to include a marker pen, a marker, a felt pen, and a small marking pen .

In the specification, the weight percentage of the specific component contained in the ink for the marking pen represents the weight percentage of the corresponding component (e.g., pigment) with respect to the entire ink.

The ink for a marking pen according to an embodiment of the present invention includes a pigment, an alcohol, a glycol ether solvent, a resin, a plasticizer, and a smoothing agent, and has a viscosity of 12 to 15 cP. At this time, the viscosity may be in the range of 12 ± 0.5 to 15 ± 0.5 cP in consideration of the error (± 0.5). The error may be a measurement error or the like.

The pigment may be a known pigment to be applied to an ink for a marking pen, and may be a commercially available organic pigment and / or an inorganic pigment. Known pigments include azo pigments, condensed azo pigments, anthraquinone pigments, perylene pigments, perinone pigments, indigo pigments, thioindigo pigments, isoindolinone pigments, azomethine pigments, quinacridone pigments, For example, PIGMENT RED 254 (CAS No. 84632-65-5), PIGMENT GREEN 7 (CAS NO.), And the like. 1328-53-6), PIGMENT BLUE 60 (CAS No. 81-77-6), PIGMENT BLACK 7 (CAS No. 1333-86-4) and the like.

The pigment may be contained in an amount of 5 to 8% by weight based on the total weight of the ink. In such a range, writing is possible more clearly and smoothly. When the content of the pigment is less than 5% by weight, there is a fear that the sharpness is lowered at the time of writing, and when the content is more than 8% by weight, writing performance may be lowered.

The resin is a film-forming resin capable of forming a film on a writing surface, and can be coated with a pigment to have appropriate adhesiveness so that the written state can be maintained, and the resin can be easily erased from the writing surface. In addition, when the ink is erased, it supports the pigment and can prevent the pigment powder from being blown. The film-forming resin may be a resin that forms a film at room temperature. At this time, the room temperature means 1 to 35 degrees Celsius.

Such a resin is preferably a resin which is dissolved in an alcohol and a glycol ether solvent, and which is dissolved by an alcohol and a glycol ether solvent to maintain a constant viscosity.

Such a resin may be at least one selected from, for example, ethylene vinyl acetate resin, cellulose resin, acrylic resin, glycerol rosin ester resin (aka, ester gum) and polyvinyl butyral resin, and preferably polyvinyl butyral Resin.

The resin may have an average molecular weight of 20,000 to 25,000 g / mol. The average molecular weight may be a weight average molecular weight.

The resin may be contained in an amount of 8 to 12% by weight based on the total weight of the ink. If the content of the resin is less than 8% by weight, the film formation state may not be maintained on the writing surface, or the pigment powder may be blown off, and when the amount is more than 12% by weight, the ink outflow rate may decrease in the pen nib, .

The alcohol is for dissolving or dispersing a pigment, a resin and the like, and is not limited as long as it is a known alcohol. For example, it may be at least one selected from lower alcohols having 1 to 4 carbon atoms. Such lower alcohols include ethyl alcohol, isopropyl alcohol, n-propyl alcohol and / or butyl alcohol. As a preferable example, the alcohol may be at least one selected from isopropyl alcohol or normal propyl alcohol and ethyl alcohol.

The alcohol may be contained in an amount of 45 to 63% by weight, more preferably 50 to 63% by weight, based on the total weight of the ink. If the content of alcohol is less than the above range, the dispersion stability of the pigment may fall and precipitation may occur to weaken the outflow performance of the ink. If the content of the alcohol is less than the above range, the dispersion stability may be deteriorated and the color and concentration may be decreased. There is a possibility that a problem may occur.

The glycol ether solvent is not limited as long as it is a known glycol ether solvent, which can dissolve or disperse pigments, resins and the like, and is also capable of controlling the viscosity of the ink. The glycol ether solvents include ethylene glycol ether, and / or propylene glycol ether. Such glycol ether solvents may be, for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and / or propylene glycol monoethyl ether.

Such a glycol ether solvent is preferably maintained at a viscosity of 2 to 6 cP, and a constant viscosity can be maintained by mixing with an alcohol and a resin. The viscosity may be a viscosity at 25 degrees Celsius.

The glycol ether solvent may be contained in an amount of 5 to 7% by weight based on the total weight of the ink. If the content of the glycol ether solvent is less than 5% by weight or exceeds 7% by weight, balance with alcohol, resin and the like may be disrupted and viscosity may be hardly maintained.

It is possible to apply the ink of the present invention to various types of marking pens due to the complex action of the components contained in the ink. However, the application of the alcohol and the glycol ether solvent together seems to be one main cause. That is, by applying the alcohol and the glycol ether solvent together, it is possible not only to appropriately dissolve and / or disperse the resin and the pigment, but also to control the viscosity of the ink, It seems to be applicable together with the required tank type marking pen.

It is preferable that the alcohol and glycol ether solvent have a boiling point of 150 DEG C or less suitable for writing.

The plasticizer is an additive that plasticizes the resin to give flexibility to the ink. It improves the writing performance and can reduce the friction with the surface after writing to make it well-erased.

The plasticizer may be, for example, but not limited to, a benzoate-based plasticizer, a phthalate-based plasticizer, and / or a citrate-based plasticizer, and may preferably be a mixture of two or more. At this time, the mixture may be a mixture of a phthalate plasticizer (e.g., polyethylene terephthalate) and a benzoate plasticizer (e.g., glyceryl tribenzoate).

Preferable examples of the plasticizer include polyethylene terephthalate (PET), glyceryl tribenzoate, diethylhexyl phthalate (DEHP), dibutyl phthalate (DBP), butyl benzyl phthalate (BBP), diisononyl phthalate (DINP) (2-methyl-2- (2-methyl-2-phenylpropoxy) ethoxy) ethyl benzoate, trimethylolpropane tribenzoate, isononyl benzoate, Ethylbenzoate, 2,2,4-trimethyl-1,3-pentanediol dibenzoate, n-hexyl benzoate, isooctyl palmitate, acetyl tributyl citrate (ATBC; Acetyl Tributyl citrate, tributyl citrate (TBC), dibutyl sebacate, triaryl phosphate, dimethyl phthalate, dioctyl sebacate, dioctyl adipate, and isooctyl stearate.

The plasticizer may be contained in an amount of 10 to 20% by weight based on the total weight of the ink. If the content of the plasticizer is less than 10% by weight, the writing performance may be lowered. If the content is more than 20% by weight, there is a fear that a residual image is left when the writing surface is erased.

The smoothing agent may serve to flatten the writing surface by making the concave surface similar to the plane when writing.

The smoothing agent is not limited thereto, but may be, for example, a silicone copolymer, a glycerin fatty acid ester, and / or a polyethylene wax, and may be used alone or in combination of two or more.

The silicone copolymer may be at least one selected from, for example, polyether siloxane copolymers, silicone glycol copolymers, and polydimethylsiloxane copolymers. More preferred examples are polyether siloxane copolymers, and / or silicone glycol copolymers. The silicone glycol copolymer may be, for example, Bis-peg-18 Methyl Ether Dimethyl Silane.

The glycerin fatty acid ester may be a glycerin fatty acid ester having a hydrophile-lipophile balance (HLB) of 2.5 to 3.5.

The polyethylene wax may be at least one selected from, for example, LDPE (Low Density Polyethylene) type polyethylene wax (PEW), and HDPE (High Density Polyethylene) type polyethylene wax. A more preferred example is flake type LDPE type polyethylene wax (PEW) having an average molecular weight of 1,000 to 2,000 g / mol. The average molecular weight may be a weight average molecular weight.

The smoothing agent may be contained in an amount of 1 to 3% by weight based on the total weight of the ink. If the amount is less than 1% by weight, the writing surface may not be smooth, and when the amount is more than 3% by weight, compatibility with the resin and the plasticizer may be deteriorated.

Although the ink of the present invention can be applied to various writing objects by the action of the components included in the ink, a smear is one of the main causes. That is, by applying a smoothing agent, it is possible to apply the present invention to a matte sheet having a rough surface in comparison with a relatively glossy white board by making a concave surface of a rough writing surface together with a resin or the like.

Further, the viscosity of the ink is in the range of 12 to 15 cP, and when the viscosity is less than 12 cP, it may be difficult to apply to the tank type marking pen, and when the curing pressure is more than 15 cP, it may be difficult to apply to the filter type marking pen. Such a viscosity can be controlled by adjusting the shape of the ink component (e.g., solid phase (spherical shape, chip shape, etc.), liquid phase, etc.), adjusting the size of the ink component, and / or adjusting the ratio and / . The viscosity can be measured with a conventional viscometer, for example, with a spindle viscometer at 25 degrees Celsius, measured at 60 rpm.

In addition, one embodiment of the present invention may further comprise a wetting agent, an oil, a dispersing agent, and / or an anti-drying agent.

The wetting agent reduces the surface tension of the ink, thereby preventing sticking between the pigment particles adsorbed to the resin or the like and allowing the ink to be written on the writing surface smoothly. The wetting agent is applied to an ink for a marking pen and may be a commercially available one, for example, one or more selected from a polyol, a polyhydric alcohol alkyl ether, and a polyhydric alcohol aryl ether. The wetting agent may be used alone or in combination of two or more.

Polyols include, for example, glycerin; Ethylene glycol; Diethylene glycol; Triethylene glycol; Polyethylene glycol; Propylene glycol; Polypropylene glycol; 1,3-propanediol; 1,4-butanediol; 1,5-pentanediol; And 1,6-hexanediol.

The polyhydric alcohol alkyl ether may be at least one selected from, for example, diethylene glycol monobutyl ether, and tetraethylene glycol monomethyl ether.

The polyhydric alcohol aryl ether may be at least one selected from, for example, ethylene glycol monophenyl ether, and ethylene glycol monobenzyl ether.

Such a wetting agent reduces the interfacial tension to increase the spreading force, and thus acts to clean the surface of the ink.

The wetting agent may be contained in an amount of 1 to 3% by weight based on the total weight of the ink. If the amount is less than 1% by weight, the writing surface may become rough, and if the amount is more than 3% by weight, the writing surface may spread and spread.

The oil may have an additional effect on ink viscosity and may facilitate ink ejection and improve writing performance. It also seems to be able to help the written ink to be erased without afterimage.

Such oils may be vegetable oils. Vegetable oils are oils extracted from plants, for example, one or more selected from evening primrose oil, grape seed oil, castor oil, and olive oil. More preferably olive oil. Olive oil can be smooth, especially when writing.

The oil may be contained in an amount of 1 to 3% by weight based on the total weight of the ink. If the amount is less than 1% by weight, the effect of oil application may be insufficient, and when the amount is more than 3% by weight, blurring may occur during writing.

The wetting agent and / or oil appears to make ink viscosity adjustment easier.

The dispersing agent promotes the dispersion of the pigment to suppress the precipitation of the pigment and the separation from the resin, and maintains the color development and storage stability of the color.

The dispersant may be a commercially available polymer dispersant (for example, nonylphenol ethoxylate, etc.) which is applied to an ink for a marking pen, and includes, but is not limited to, for example, an alkylolammonium salt of a polyfunctional polymer, Alkylol ammonium salts of low molecular polycarboxylic acid polymers, alkylol ammonium salts of block copolymers having acidic groups, alkylammonium salts of polycarboxylic acids, unsaturated polyamine amide salts, oxirane polymers, modified acrylate copolymers, and nonylphenol Ethoxylate. ≪ / RTI >

The dispersing agent may be contained in an amount of 1 to 5% by weight based on the total weight of the ink. If the content of the pigment is less than 1% by weight, dispersion of the pigment may be insufficient and there is a fear that the pigment is unevenly discharged from the marking pen or the pigment is separated from the marking pen. There is concern.

The drying inhibitor is to retard the drying speed of the ink. The drying inhibitor may be, but is not limited to, one or more selected from, for example, polyglycerin fatty acid esters, glycerin, sucrose fatty acid esters, sucrose stearic acid esters, and polyglycerin esters. Such a drying inhibitor may be used by dissolving at a temperature of 50 to 60 degrees Celsius when the solubility is low at room temperature. The drying inhibitor may be contained in an amount of 1 to 2% by weight based on the total weight of the ink. If the amount is less than 1% by weight, the drying may proceed quickly, and if the amount is more than 2% by weight, the drying speed may be slow.

An embodiment of the present invention can be applied to various kinds of marking pens and writing objects by the combined action of this structure. In addition, it has characteristics such as clear writing and easy erasure. These effects can also be confirmed through Examples 1, 2, and Experimental Examples described below. The inks applied to the following examples were measured for viscosity (measurement conditions: 25 ° C, 60 rpm, spindle No. 31) using a spindle viscometer (BROOKFIELD, LVDV-II Pro model) for each ink.

≪ Example 1 >

1-1. Black ink

5.5 weight% of pigment black 7 (pigment, CAS No. 1333-86-4, Carbon Black Printex 70, Degussa, Germany), 1.5 weight% of polymer dispersant (dispersant, nonylphenol ethoxylate, SOLSPERSE 27000, USA, LYBRIZOL Corp.) , 8.0 wt% of polyvinyl butyral resin (resin, Vinyl Butyral Polymers, BL-2, SEKISUI CHEMICAL, Japan), 45 wt% of ethyl alcohol, 15 wt% of isopropyl alcohol, propylene glycol monoethyl ether 2.0 wt% of isooctyl palmitate (plasticizer, UNISTER MB-816, Japan, NOF Corp.), 6.0 wt% of polyethylene terephthalate (plasticizer, 2.0 wt% of dibutyl sebacate (plasticizer, Hister M-1321, Oh sung Chem, Korea), polyhydric alcohol alkyl ether (wetting agent, diethylene glycol monobutyl ether, 1.5 wt%, olive oil (Kirkland) 1.5 wt%, Bis-peg-18Methyl Ether Dimethyl Silane (smoothing agent, SM (KCC), 2.0% by weight of sucrose fatty acid ester (drying inhibitor, S-1170 (sucrose ester of fatty acid), Japan, Mitsubishi Chemical Co., Ltd.) were mixed and stirred for 8 hours or more, To prepare an ink for a marking pen having an average particle size of 0.1 to 0.15 mu m and a viscosity of 12 cP. The error range of the viscosity was ± 0.5 cP.

1-2. Red ink

Except that PIGMENT RED 254 (pigment, CAS No. 84632-65-5, VYNAMON RED 325401, Heubach Co., Germany) was used in place of PIGMENT BLACK 7 to obtain an ink for marking pen having a viscosity of 12 cP . The error range of the viscosity was ± 0.5 cP.

1-3. Blue ink

Except that PIGMENT BLUE 60 (pigment, CAS No. 81-77-6, Paliogen Blue L 6480, manufactured by BASF AG, Germany) was used instead of PIGMENT BLACK 7, and a marking pen having a viscosity of 12 cP Ink. The error range of the viscosity was ± 0.5 cP.

1-4. Green ink

(Resin, Vinyl Butyral Polymers, BL-2, Japan SEKISUI CHEMICAL Co., Ltd.) was used instead of PIGMENT BLACK 7 by using PIGMENT GREEN 7 (pigment, CAS No. 1328-53-6, VYNAMON Green 600734, Heubach, Germany) Except that a polyvinyl butyral resin (resin, Vinyl Butyral Polymers, BL-1, manufactured by SEKISUI CHEMICAL INC., Japan) was used in place of the ink for ink for marking . The error range of the viscosity was ± 0.5 cP.

≪ Example 2 >

2-1. Black ink

PIGMENT BLACK 7 nano pigment chip (pigment, average particle size 0.1 to 0.15 um, CAS NO. (Resin, Vinyl Butyral Polymers, trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 5.5% by weight of polyvinyl butyral resin, 1333-86-4, (Propylene glycol monoethyl ether, Korea, concentrate) 6.0 wt%, polyethylene terephthalate (plasticizer, available from SEIKISUI CHEMICAL Co., Ltd., Japan), 8.0 wt% of ethyl alcohol, 45 wt% of isopropyl alcohol, , 2.0 wt% of isooctyl palmitate (plasticizer, UNISTER MB-816, Japan NOF Corp.), 2.5 wt% of glycerol rosin ester (resin, Ecopower Chem, China), dibutyl sebacate 1.5% by weight of olivine oil (Kirkland), 1.5% by weight of Bis-peg-18 (manufactured by Mitsubishi Kagaku Kogyo Co., Ltd.), 2.0% by weight of polyoxyalkylene alkylether 1.5% by weight of Methyl Ether Dimethyl Silane (smoothing agent, SM 4110P, Korea KCC), sucrose fatty acid ester 2.0% by weight of S-1170 (sucrose ester of fatty acid), Mitsubishi Corp., Japan) was mixed and dispersed for 24 hours to prepare an ink for a marking pen having an average particle size of 0.1 to 0.15 μm and a viscosity of 15 cP. The error range of the viscosity was ± 0.5 cP.

2-2. Red ink

PIGMENT BLACK Instead of the 7-nano pigment chip, PIGMENT RED 254 nano pigment chip (pigment, average particle size 0.1 to 0.15 μm, CAS NO. 84632-65-5, Japan Fujisawa) was used in place of the ink for the marking pen having the viscosity of 15 cP. The error range of the viscosity was ± 0.5 cP.

2-3. Blue ink

PIGMENT BLACK Instead of the 7 nano pigment chip, PIGMENT BLUE 60 nano pigment chip (pigment, average particle size 0.1 to 0.15 um, CAS NO. 81-77-6, Japan Fujisawa) was used in place of the ink for the marking pen having the viscosity of 15 cP. The error range of the viscosity was ± 0.5 cP.

2-4. Green ink

PIGMENT BLACK Instead of the 7-nano pigment chip, PIGMENT GREEN 7-nano pigment chip (pigment, average particle size 0.1 to 0.15 μm, CAS NO. (Resin, Vinyl Butyral Polymers, BL-2, available from SEKISUI CHEMICAL Japan) instead of polyvinyl butyral resin (resin, Vinyl Butyral Polymers, BL- 1, manufactured by SEKISUI CHEMICAL CO., LTD., Japan) was used in the same manner as in 2-1. To prepare an ink for a marking pen having a viscosity of 15 cP. The error range of the viscosity was ± 0.5 cP.

<Experimental Example> Writing performance and item test

Each of the ink for the filter type marking pen (M company, A company, O company, Y company), tank type marking pen ink (M company, O company), Example 1, The marking pen and the tank type marking pen were filled and a marking pen to be used for the experiment was prepared.

For each ink, viscosity was measured (25 degrees Celsius, 60 rpm, spindle No. 31) using a spindle viscometer (BROOKFIELD, LVDV-II Pro model), writing on a whiteboard per marking pen, Experiments were conducted on the ease of writing. The results are summarized in Table 1. When the ink for the filter type marking pen is applied to the marking pen of the tank type, a large amount of ink flows out due to the nib of the pen, the writing performance is very poor. When the ink for the tank type marking pen is applied to the filter type marking pen, This was very bad. On the contrary, in Examples 1 and 2, excellent writing performance was exhibited even when applied to both the filter type marking pen and the tank type marking pen. Accordingly, it can be seen that the ink for a marking pen of the present invention is applicable to various kinds of marking pens.

ink Viscosity
(cP, + - 0.5) Filter type marking Pen when writing pen Writing on tank type marking pen M filter type 6.5 to 9.0 ◎ × A filter type 6.5 to 9.0 ◎ × O filter type 6.5 to 9.0 ◎ × Y filter type 6.5 to 9.0 ◎ × M company tank type 20.0 to 35.0 × ◎ O type tank type 20.0 to 35.0 × ◎ Example 1-1 12 ◎ ◎ Examples 1-2 12 ◎ ◎ Example 1-3 12 ◎ ◎ Examples 1-4 12 ◎ ◎ Example 2-1 15 ◎ ◎ Example 2-2 15 ◎ ◎ Example 2-3 15 ◎ ◎ Examples 2-4 15 ◎ ◎ Judgment symbol ⊚: very good ◯: good △: fair ⊚: poor

Further, the inks for the first and second embodiments, the ink for the filter-type marking pen (O company), and the ink for the tank-type marking pen (O company) were subjected to the item tests.

O Test method for each item

1. Color Concentration of Writing Coating: Writing on a writing surface was followed by visual inspection.

2. Degree of detachment when clearing: The degree of detachment of the handwriting film by lightly removing it with an eraser or a finger was visually determined.

3. Novel generation of dust: The extent of dust that was dropped by the eraser to generate dust was visually determined.

4. Initial erosion: After being left for 5 to 10 minutes at room temperature (25 degrees Celsius) in a written state, it was erased with a pressure of 50 g / cm ² to determine the degree of erasure.

5. Long-term erasure property: after one month standing at room temperature (25 ° C) in the written state, and determines the degree of erasure, erasing at a pressure of 50g / cm ^2.

6. Elimination of writing marks on the erased surface: After erasing with the eraser, it was visually judged whether the marks remained on the writing surface without coloring the pigment.

7. Spillability: The extent to which writing was possible due to smooth outflow of ink from the pen tip was determined.

8. Stability of Ink: The phenomenon that the dispersed pigment particles aggregated with each other during precipitation and separation during storage of the ink for a long time (1 month) was compared and judged.

Tests 1 to 6 of the ink for the filter type marking pen and the ink for the tank type marking pen were performed while the ink was filled in the marking pen corresponding to each ink type. Further, in the test of 7 items for the ink for the filter type marking pen and the ink for the tank type marking pen, the ink for the filter type marking pen was filled in the tank type marking pen and the ink for the tank type marking pen was filled in the filter type marking pen. Further, in the tests of items 1 to 7 of Example 1 and Example 2, the ink of Example 1 was filled in a filter type marking pen, and the ink of Example 2 was filled in a tank type marking pen. Item 8 is for the ink itself not filled in the marking pen.

At this time, the tests of items 1 to 7 were carried out by dividing into a case where the object to be handwritten is a glossy surface (white board) and a case in which the object to be written is a matte surface (matte sheet).

O Test results by item

Table 2 shows the test results for each item. For convenience, in each of Examples 1 and 2, only the results of Examples 1-1 and 2-1 are summarized in Table 2, but Examples 1-2 to 1-4 and Examples 2-2 to 2-4 , The same results as in Examples 1-1 and 2-1 were obtained.

Item
O filter type O type tank type Example 1-1 Example 2-1 Bright side Matte surface Bright side Matte surface Bright side Matte surface Bright side Matte surface One △ △ ◎ ◎ ◎ ◎ ◎ ◎ 2 △ × ○ ◎ ◎ ◎ ◎ ◎ 3 ○ ○ ◎ ◎ ◎ ◎ ◎ ◎ 4 △ △ ○ ○ ◎ ◎ ◎ ◎ 5 ○ ○ △ △ ◎ ◎ ◎ ◎ 6 △ △ △ △ ◎ ◎ ◎ ◎ 7 × × × × ◎ ◎ ◎ ◎ 8 △ ◎ ◎ ◎ Judgment symbol ⊚: very good ◯: good △: fair ×: poor

As a result of the test, it can be seen that Examples 1 and 2 are superior to ink for a filter-type marking pen in terms of color density at the time of writing, degree of detachment at the time of erasure, initial erasure, and erasure of written marks on the erased film . Further, Examples 1 and 2 are superior to the ink for the tank type marking pen in terms of long-term erasure and erasure of written marks on the erased film. Furthermore, it can be seen that such superiority is not related to the object to be handwritten.

Therefore, it can be seen that the present invention is applicable to various writing objects and marking pen types. Further, it can be seen that the present invention is excellent in writing performance because it can be written in a wide and easy manner when applied to various writing objects and marking pens, and is easily erased irrespective of a period of time,

Claims (10)

An ink for a marking pen, comprising a pigment, an alcohol, a glycol ether solvent, a resin, a plasticizer, and a smoothing agent and having a viscosity of 12 to 15 cP. The ink for a marking pen according to claim 1, wherein the alcohol is at least one selected from the group consisting of lower alcohols having 1 to 4 carbon atoms. The ink for a marking pen according to claim 1, wherein the solvent of the glycol ethers is at least one selected from ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and propylene glycol monoethyl ether. The ink for a marking pen according to claim 1, wherein the resin is a resin dissolved in the alcohol and the glycol ether solvent. The ink for a marking pen according to claim 1, wherein the resin is at least one selected from an ethylene vinyl acetate resin, a cellulose resin, an acrylic resin, a glycerol rosin ester resin, and a polyvinyl butyral resin. The ink for a marking pen according to claim 1, wherein the alcohol is contained in an amount of 45 to 63% by weight based on the total weight of the ink, and the glycol ether solvent is contained in an amount of 5 to 7% by weight. The ink for a marking pen according to claim 6, wherein the pigment is contained in an amount of 5 to 8% by weight based on the total weight of the ink, and the resin is contained in an amount of 8 to 12% by weight. The ink for a marking pen according to claim 7, wherein the plasticizer is contained in an amount of 10 to 20% by weight based on the total weight of the ink, and the smoothing agent is contained in an amount of 1 to 3% by weight. The ink for a marking pen according to claim 1, further comprising at least one selected from oil, and a wetting agent. The ink for a marking pen according to claim 1, further comprising at least one selected from a dispersing agent and an anti-drying agent.