WO2017094982A1 - Ink for marking pen - Google Patents

Abstract

The present invention provides an ink for a marking pen, the ink comprising a pigment, an alcohol, a glycolether solvent, a resin, a plasticizer, and a leveling agent and having a viscosity of 12-15 cP. The present invention has an advantage of being applicable to various writing objects and marking pen types. In addition, the present invention has an advantage of having excellent characteristics, such as writability and erasability.

Description

Marking pen ink

The present invention relates to ink for marking pens, and to marking ink of various types and marking pens applicable to writing objects.

Marking pens, also called marker pens, markers, felt-tip pens, and board markers, are pens with their own ink sources and nibs. They are writing instruments that allow you to write on a white board and easily erase them.

Conventional marking pens are also called filter type marking pens in such a way that the filter absorbs the ink and moves the ink from the filter to the nib so that writing is performed (see Korean Utility Model No. 20-0178324, etc.). In the case of the filter type, since the ink passes through the filter, there is a limit in applying a large amount of ink, and since the filter itself absorbs the ink, it is difficult to write in dark colors, and the ink dries during long-term storage. there was.

On the other hand, a filter is not applied to the marking pen, also called a tank type, and ink is stored in the pen body, also called an ink tank, so that the ink in the ink tank moves to the pen tip to write. . The tank type was able to overcome the disadvantages of the filter type, but after a certain period of time there was a problem that the erase property is rather poor than the filter type.

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

Therefore, there is a need for the development of marking pen inks applicable to various kinds of marking pens.

On the other hand, there is a need for the development of a marking pen ink that can be easily applied to matte writing objects such as matte sheets as well as matte writing objects such as whiteboard.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) Republic of Korea Utility Model Registration No. 20-0178324, April 15, 2000, Drawing 1

The problem to be solved by the present invention is to provide a marking pen of various types and marking pen ink applicable to the writing object.

Hereinafter, other technical problems not mentioned in the above technical problem will be clearly understood by those skilled in the art from the following description.

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

The pigments include azo pigments, condensed azo pigments, anthraquinone pigments, perylene pigments, perinone pigments, indigo pigments, thioindigo pigments, isoindolinone pigments, azomethine pigments, quinacridone pigments, One or more selected from phthalocyanine blue, dioxazine violet, aniline black, and carbon black.

The pigment may be included 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 ethylene vinyl acetate resin, cellulose resin, acrylic resin, glycerol rosin ester resin, and polyvinyl butyral resin.

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

The resin may be included 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 included 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 glycol ether solvent may be at least one selected from ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and propylene glycol monoethyl ether.

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

The glycol ether solvent may be included 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 plasticizer, a phthalate plasticizer, and a citrate plasticizer.

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

The leveling agent may be at least one selected from silicone copolymers, glycerin fatty acid esters, and polyethylene waxes.

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

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

The ink may further comprise one or more selected from oils, and humectants.

The oil may be a vegetable oil.

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

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

The wetting agent may be one or more selected from polyols, polyhydric alcohol alkyl ethers, and polyhydric alcohol aryl ethers.

The humectant may be included 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 dispersant and a drying agent.

The dispersant may be a polymer dispersant.

The dispersant may be included 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 polyglycerol fatty acid ester, glycerin, sucrose fatty acid ester, sucrose stearic acid ester, and polyglycerol ester.

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

In addition, with respect to the total weight of the ink, the alcohol is included in the amount of 45 to 63% by weight, the glycol ether solvent may be included in the amount of 5 to 7% by weight.

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

In addition, with respect to the total weight of the ink, the pigment may be included in an amount of 5 to 8% by weight, and the resin may be included in an amount of 8 to 12% by weight.

In addition, with respect to the total weight of the ink, the oil may be included in an amount of 1 to 3% by weight, and the humectant may be included in an amount of 1 to 3% by weight.

In addition, with respect to the total weight of the ink, the dispersant may be included in an amount of 1 to 5% by weight, and the drying inhibitor may be included in an amount of 1 to 2% by weight.

The present invention has the effect that it can be applied to various writing objects and marking pen types. Moreover, this invention has the effect that it is excellent in characteristics, such as handwriting and eraseability.

Advantages and features of the present invention, and a method of achieving them will be apparent from the following detailed description with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided merely to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims.

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

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and / or “comprising” refers to the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions.

"Marking pen" is a pen with its own ink source and nib. It is a writing instrument that makes it easy to erase while writing on a white board. It includes a marker pen, a marker, a felt-tip pen, and an erasable marking pen. .

In the specification, the weight percentage of the specific component included in the ink for the marking pen indicates the percentage by weight of the corresponding component (eg, pigment) with respect to the entire ink.

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

The pigment may be a known pigment 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, and quinacridone pigments. , Phthalocyanine blue, dioxazine violet, aniline black, and / or carbon black and the like, and commercially available pigments include, for example, PIGMENT RED 254 (CAS NO. 84632-65-5), PIGMENT GREEN 7 (CAS NO. 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 included in an amount of 5 to 8% by weight based on the total weight of the ink. In this range, it is possible to write more clearly and smoothly. When the content of the pigment is less than 5% by weight, there is a fear that the sharpness is poor when writing, and when more than 8% by weight there is a fear that the writeability is lowered.

Resin is a film-forming resin that can form a film on the writing surface, coating the pigment to have an appropriate adhesiveness to maintain a written state, and at the same time can be easily erased from the writing surface. In addition, when it is erased, it supports the pigment and can serve to prevent the pigment from flying. The film forming resin may be a resin that forms a film at room temperature. At this time, room temperature means 1 to 35 degrees Celsius.

Such resin is preferably a resin which is dissolved in an alcohol and a glycol ether solvent, and a resin which is dissolved in an alcohol and a glycol ether solvent and maintains a constant viscosity is preferable.

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

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

The resin may be included in an amount of 8 to 12% by weight based on the total weight of the ink. When the content of the resin is less than 8% by weight, it may be difficult for the film forming state to continue on the writing surface or the pigment may be blown off. If the content is more than 12% by weight, the ink outflow rate may be reduced at the tip of the pen. .

The alcohol is used to dissolve or disperse the pigment, resin, and the like, and is not limited as long as it is a known alcohol. For example, the alcohol may be at least one selected from lower alcohols having 1 to 4 carbon atoms. Such lower alcohols include ethyl alcohol, isopropyl alcohol, normal propyl alcohol and / or butyl alcohol and the like. In a preferred embodiment, the alcohol may be ethyl alcohol and at least one selected from isopropyl alcohol or normal propyl alcohol.

The alcohol may be included 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, causing precipitation to weaken the ink outflow performance.When the content exceeds the above range, the dispersion stability may not be reduced, but also the color and concentration may fall. There is a risk of problems.

The glycol ether solvents can dissolve or disperse pigments, resins, and the like, and can control the viscosity of the ink, and are not limited as long as they are known glycol ether solvents. 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 can maintain a constant viscosity by mixing with an alcohol and a resin. The viscosity may be a viscosity at 25 degrees Celsius.

Glycol ether solvent may be included in an amount of 5 to 7% by weight based on the total weight of the ink. When the content of the glycol ether solvent is less than 5% by weight or more than 7% by weight, there is a concern that it is difficult to maintain the viscosity because the balance with alcohol, resin, and the like is broken.

Although the ink of the present invention can be applied to various types of marking pens by a complex action of components included in the ink, it is considered that one of the main causes is the application of alcohol and glycol ether solvents together. That is, by applying an alcohol and a glycol ether solvent together, not only can dissolve and / or disperse resins and pigments appropriately, but also the filter type marking pen and high viscosity requiring low viscosity by controlling the viscosity of the ink. This seems to be applicable together with the required tank type marking pen.

It is preferable that such an alcohol and glycol ether solvent are 150 degrees C or less which is a boiling point suitable for writing.

The plasticizer is an additive that plasticizes the resin and gives flexibility to the ink. The plasticizer may improve the writing property and reduce the friction with the surface after the writing so as to be erased well.

The plasticizer is not limited thereto, but may be, for example, a benzoate plasticizer, a phthalate plasticizer, a citrate plasticizer, or the like, and preferably a mixture of two or more. In this case, the mixture may be a mixture of a phthalate plasticizer (eg, polyethylene terephthalate) and a benzoate plasticizer (eg, glyceryl tribenzoate).

Preferred examples of plasticizers include polyethylene terephthalate (PET), glyceryl tribenzoate, diethylhexylphthalate (DEHP), dibutylphthalate (DBP), butylbenzylphthalate (BBP), diisononylphthalate (DINP), di- En-octylphthalate (DNOP), 2- (2- (2-phenylcarbonyloxyethoxy) ethoxy) ethyl benzoate, trimethylolpropane tri benzoate, isononyl benzoate, 1-methyl-2- (2 -Phenylcarbonyloxypropoxy) ethyl benzoate, 2, 2, 4-trimethyl-1, 3-pentanediol dibenzoate, n-hexyl benzoate, isooctyl palmitate, acetyltributyl citrate (ABC; Acetyl Tributyl Citrate), tributyl citrate (TBC; Tributyl Citrate), dibutyl sebacate, triaryl phosphate, dimethylphthalate, dioctyl sebacate, dioctyl adipate, and isooctyl stearate.

The plasticizer may be included in an amount of 10 to 20% by weight based on the total weight of the ink. When the content of the plasticizer is less than 10% by weight, there is a concern that the writeability is lowered, and when the content of the plasticizer exceeds 20% by weight, there is a fear that an afterimage remains when erased from the writing surface.

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

The leveling agent is not limited thereto, but may be, for example, silicone copolymers, glycerin fatty acid esters, and / or polyethylene waxes, and the like may be used alone or in combination of two or more thereof.

The silicone copolymer can be, for example, one or more selected from polyether siloxane copolymers, silicone glycol copolymers, and polydimethyl siloxane copolymers. More preferred examples are poly ether 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, for example, one or more selected from Low Density Polyethylene (LDPE) type polyethylene wax (PEW), and High Density Polyethylene (HDPE) type polyethylene wax. A more preferred example is a 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 leveling agent may be included in an amount of 1 to 3% by weight based on the total weight of the ink. There is a concern that the writing surface may not be flat at less than 1% by weight, and when more than 3% by weight, compatibility with the resin and the plasticizer may be lowered.

It is possible to apply the ink of the present invention to various writing objects due to the complex action of the components contained in the ink, but the smoothing agent is one of the main reasons. That is, by applying the smoothing agent, it seems to be applicable simultaneously to the matte sheet having a rough surface relative to the glossy whiteboard by smoothing the concave surface of the rough writing surface together with the resin.

In addition, the viscosity of the ink is 12 to 15 cP, there is a concern that it is difficult to apply to the tank type marking pen at less than 12 cP, there is a fear that it is difficult to apply to the filter type marking pen when 15 cP. Such viscosity can be controlled by adjusting the shape of the ink component (eg, solid phase (spherical, chip, etc.), liquid phase, etc.), controlling the size of the ink component, and / or adjusting the proportion and / or concentration of the solvent. . 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 include a humectant, an oil, a dispersant, and / or a drying agent.

The wetting agent reduces the surface tension of the ink, and prevents the adhesion between the pigment particles adsorbed on the resin and the like so that the ink can be smoothly written on the writing surface. The humectant is applied to the ink for the marking pen and may be commercially available. For example, the humectant may be at least one selected from polyol, polyhydric alcohol alkyl ether, and polyhydric alcohol aryl ether. Wetting agents can be used 1 type or in mixture of 2 or more types.

Polyols are, 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 and increases the diffusion force, thereby acting to clean the surface of the ink.

Wetting agents may be included in amounts of 1-3% by weight based on the total weight of the ink. There is a concern that the writing surface becomes rough at less than 1% by weight, and when it exceeds 3% by weight, the writing surface may spread and spread.

The oil may have an additional effect on ink viscosity, and may serve to facilitate ink ejection to improve handwriting. It also seems to be able to help the written ink to be erased without afterimages.

Such oil may be a vegetable oil. The vegetable oil is an oil extracted from a plant, and may be, for example, one or more selected from evening primrose oil, grape seed oil, castor oil, and olive oil. More preferably, it may be olive oil. Olive oil can have a particularly smooth surface when writing.

The oil may be included in an amount of 1 to 3% by weight based on the total weight of the ink. At less than 1% by weight there is a fear that the effect of applying the oil is insufficient, there is a fear that smearing occurs when writing at more than 3% by weight.

With humectants and / or oils, ink viscosity control appears to be easier.

Dispersing agents promote the dispersion of pigments to suppress pigmentation and separation from resins and to maintain color development and shelf life.

The dispersant is applied to the ink for the marking pen, and may be a commercially available polymer dispersant (eg, nonylphenol ethoxylate, etc.), but is not limited thereto. For example, alkylol ammonium salt of the multifunctional polymer, Alkylol ammonium salts of low molecular weight polycarboxylic acid polymers, alkylol ammonium salts of block copolymers having acidic groups, alkyl ammonium salts of polycarboxylic acids, unsaturated polyamine amide salts, oxirane polymers, modified acrylate copolymers, and nonylphenols It may be at least one selected from ethoxylates.

The dispersant may be included in an amount of 1 to 5% by weight based on the total weight of the ink. Less than 1% by weight of pigment may be insufficient to disperse the pigments, which may result in inadequate release of the pigment from the marking pen or separation of the pigments. There is concern.

The drying inhibitor is to delay the drying speed of the ink. The drying inhibitor is not limited thereto, but may be, for example, at least one selected from polyglycerol fatty acid esters, glycerin, sucrose fatty acid esters, sucrose stearic acid esters, and polyglycerol esters. Such a drying inhibitor may be used by dissolving at 50 to 60 degrees Celsius when the solubility is low at room temperature. The drying inhibitor may be included in an amount of 1 to 2% by weight based on the total weight of the ink. There is a concern that the drying proceeds faster than less than 1% by weight, and there is a fear that the drying rate is slower than 2% by weight.

One embodiment of the present invention can be applied to various types of marking pens and writing objects by the complex action of such a configuration. It also has characteristics such as clear handwriting and easy erasing. Such effects can also be confirmed through the following Examples 1, 2, and Experimental Examples. The ink applied to the following Examples was measured for each ink by using a spindle viscometer (BROOKFIELD Co., LVDV-II Pro model) (measured condition: 25 degrees Celsius, 60 rpm, spindle NO. 31).

Example 1 Ink

1-1. Black ink

PIGMENT BLACK 7 (pigment, CAS NO. 1333-86-4, Carbon Black Printex 70, Degussa, Germany) 5.5 wt%, polymer dispersant (dispersant, nonylphenol ethoxylate, SOLSPERSE 27000, USA, LYBRIZOL Corp.) 1.5 wt% %, Polyvinyl butyral resin (resin, Vinyl Butyral Polymers, BL-2, Japan, SEKISUI CHEMICAL) 8.0 wt%, ethyl alcohol 45 wt%, isopropyl alcohol 15 wt%, propylene glycol monoethyl ether (Korea, Hannong Hwaseong) 6.0% by weight, polyethylene terephthalate (plasticizer, Korea, Miwon Corporation) 6.0% by weight, isooctyl palmitate (plasticizer, UNISTER MB-816, Japan, NOF Corp.) 2.0% by weight, glycerol rosin ester (resin, China, Ecopower Chem) 2.5% by weight, dibutyl sebacate (plasticizer, Hister M-1321, Korea, Oh sung Chem) 2.0% by weight, polyhydric alcohol alkyl ether (wetting agent, diethylene glycol monobutyl ether, Korea, Han Thiang) 1.5% by weight, olive oil (Kirkland) 1.5% by weight, Bis-peg-18 Methyl Ether Dimethyl Silane (Smoothing agent, SM 4110P, Korea KCC) 1.5% by weight, sucrose fatty acid ester {drying inhibitor, S-1170 (sucrose ester of fatty acid), Japan, Mitsubishi Corporation} 2.0% by weight, mixed, stirred and dispersed for at least 8 hours, then mill (Dyno mill) Milling was performed to prepare an ink for a marking pen having an average particle size of 0.1 to 0.15 um and a viscosity of 12 cP. The error range of the viscosity was ± 0.5 cP.

1-2. Red ink

Marking pen ink having a viscosity of 12 cP in the same manner as in 1-1, except that PIGMENT RED 254 (pigment, CAS NO. 84632-65-5, VYNAMON RED 325401, Heubach, Germany) was used instead of PIGMENT BLACK 7. Was prepared. The error range of the viscosity was ± 0.5 cP.

1-3. Blue ink

For marking pens having a viscosity of 12 cP, in the same manner as 1-1, except that PIGMENT BLUE 60 (pigment, CAS NO.81-77-6, Paliogen Blue L 6480, BASF, Germany) was used instead of PIGMENT BLACK 7. Ink was prepared. The error range of the viscosity was ± 0.5 cP.

1-4. Green ink

PIGMENT GREEN 7 (pigment, CAS NO. 1328-53-6, VYNAMON Green 600734, Heubach, Germany) instead of PIGMENT BLACK 7, polyvinyl butyral resin (resin, Vinyl Butyral Polymers, BL-2, Japan SEKISUI CHEMICAL G) A marking pen having a viscosity of 12 cP was prepared in the same manner as in 1-1, except that polyvinyl butyral resin (resin, Vinyl Butyral Polymers, BL-1, SEKISUI CHEMICAL, Japan) was used instead. . The error range of the viscosity was ± 0.5 cP.

Example 2 Ink

2-1. Black ink

PIGMENT BLACK 7 Nano Pigment Chip {Pigment, average particle size 0.1 to 0.15um, CAS NO. 1333-86-4, Fujisa, Japan} 5.5% by weight, polymer dispersant (dispersant, nonylphenol ethoxylate, SOLSPERSE 27000, USA, LYBRIZOL Corp.) 1.5% by weight, polyvinyl butyral polymers (resin, Vinyl Butyral Polymers, BL-2, Japan SEKISUI CHEMICAL Co., Ltd. 8.0% by weight, ethyl alcohol 45% by weight, isopropyl alcohol 15% by weight, propylene glycol monoethyl ether (Korea, thickening) 6.0% by weight, polyethylene terephthalate (plasticizer, Korea, Miwon Firm) 6.0 wt%, Isooctyl palmitate (plasticizer, UNISTER MB-816, Japan NOF Corp.) 2.0 wt%, Glycerol rosin ester (resin, China Ecopower Chem) 2.5 wt%, Dibutyl sebacate (plasticizer, Hister M-1321, Korea Oh sung Chem) 2.0% by weight, polyhydric alcohol alkyl ether (wetting agent, diethylene glycol monobutyl ether, Korea, Han Thickening) 1.5% by weight, olive oil (Kirkland) 1.5% by weight, Bis-peg-18 Methyl Ether Dimethyl Silane (Smoothing agent, SM 4110P, Korea KCC) 1.5 wt%, Sucrose fatty acid ester A preservative, S-1170 (a sucrose ester of fatty acid) and 2.0 weight% of Mitsubishi Corporation, Japan were mixed and dispersed for 24 hours to prepare an ink for marking pens having an average particle size of 0.1 to 0.15 um and a viscosity of 15 cP. The error range of the viscosity was ± 0.5 cP.

2-2. Red ink

PIGMENT RED 254 nano pigment chip instead of pigment black 7 nano pigment chip {pigment, average particle size 0.1 to 0.15um, CAS NO. An ink for marking pens having a viscosity of 15 cP was prepared in the same manner as in 2-1, except that 84632-65-5, Fuji Fuji Co., Ltd.} was used. The error range of the viscosity was ± 0.5 cP.

2-3. Blue ink

PIGMENT BLUE 60 nano pigment chip instead of pigment black 7 nano pigment chip {pigment, average particle size 0.1 to 0.15um, CAS NO. 81-77-6, except for using the Japanese Fuji company, was carried out in the same manner as 2-1. To prepare a marking pen ink having a viscosity of 15 cP. The error range of the viscosity was ± 0.5 cP.

2-4. Green ink

PIGMENT GREEN 7 nano pigment chip instead of PIGMENT BLACK 7 nano pigment chip {Pigment, average particle size 0.1 to 0.15um, CAS NO. 1328-53-6, Fuji Fuji, Japan, and polyvinyl butyral resins (resin, Vinyl Butyral Polymers, BL-) instead of polyvinyl butyral resins (resin, Vinyl Butyral Polymers, BL-2, SEKISUI CHEMICAL, Japan). 1, Japanese SEKISUI CHEMICAL Co., Ltd. was used, and was carried out in the same manner as in 2-1, to prepare a marking pen ink having a viscosity of 15 cP. The error range of the viscosity was ± 0.5 cP.

Experimental Test

Commercially available filter type marking pen ink (M company, A company, O company, Y company), tank type marking pen ink (M company, O company), Examples 1 and 2, respectively, filter type A marking pen and a tank type marking pen were filled to prepare a marking pen for an experiment.

For each ink, the viscosity was measured (25 degrees Celsius, 60 rpm, spindle NO. 31) using a spindle viscometer (BROOKFIELD, LVDV-II Pro model), written on a white board for each marking pen, and when writing The test for ease of writing was conducted. The results are summarized in Table 1. When applying the ink for the filter type marking pen to the tank type marking pen, the ink flowed out with the tip of the pen and the writing performance was very poor.When applying the ink for the tank type marking pen to the filter type marking pen, the ink did not flow out through the pen tip. This was very bad. On the contrary, in the case of Examples 1 and 2, even when applied to either the filter type marking pen or the tank type marking pen, excellent writing performance was shown. Therefore, it can be seen that the marking pen ink of the present invention can be applied to various kinds of marking pens.

ink	Viscosity (cP, ± 0.5)	Handwriting when filter type marking pen is applied	Handwriting when applying tank type marking pen
M company filter type	6.5 ~ 9.0	◎	×
A company filter type	6.5 ~ 9.0	◎	×
O company filter type	6.5 ~ 9.0	◎	×
Y company filter type	6.5 ~ 9.0	◎	×
M company tank type	20.0-35.0	×	◎
O company tank type	20.0-35.0	×	◎
Example 1-1	12	◎	◎
Example 1-2	12	◎	◎
Example 1-3	12	◎	◎
Example 1-4	12	◎	◎
Example 2-1	15	◎	◎
Example 2-2	15	◎	◎
Example 2-3	15	◎	◎
Example 2-4	15	◎	◎
Judgment symbol	◎: Very good ○: Good △: Normal ×: Bad

In addition, the item-specific test was done about the ink of Example 1, Example 2, the ink for filter type marking pens (O company), and the ink for tank type marking pens (O company).

O Test Method by Item

1. Color density of the writing film: Visually judged after writing on the writing surface.

2. Degree of fall when erasing: The degree to which the writing film was lightly peeled off with an eraser or a finger was visually judged.

3. Non-occurrence of dust: Visually determined the degree of dust generated by erasing with an eraser.

4. Initial Erase: After 5 to 10 minutes at room temperature (25 degrees Celsius) in a written state, the degree of erasing was determined by erasing with a pressure of 50 g / cm ² .

5. Long-term erasure: After leaving for one month at room temperature (25 degrees Celsius) in a written state, the degree of erasing was determined by erasing with a pressure of 50 g / cm ² .

6. Erasability of writing traces on the erased surface: It was visually determined whether the pigments were not released on the writing surface but stained after being erased with an eraser.

7. Outflow: It was determined that the ink was smoothly spilled from the nib so that writing was possible.

8. Stability of ink: The ink was stored for a long time (1 month), and the pigment particles dispersed therein were agglomerated and precipitated.

The tests in items 1 to 6 for the ink for the filter type marking pen and the ink for the tank type marking pen were conducted with the ink filled in the marking pen corresponding to each ink type. In the seven items of the test 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 is filled with the tank type marking pen, and the ink for the tank type marking pen is filled with the filter type marking pen. In addition, in the tests of items 1 to 7 for Examples 1 and 2, the ink of Example 1 was filled with a filter type marking pen and the ink of Example 2 was filled with a tank type marking pen. In addition, item 8 is about the ink itself which is not filled in the marking pen.

At this time, the tests of items 1 to 7 were performed by dividing the writing object into a case of a glossy surface (white board) and a case of a matt surface (matte sheet).

O Test Result by Item

The test results for each item are summarized in Table 2. 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 are also , Examples 1-1, 2-1 showed the same level of results.

Item	O company filter type		O company tank type		Example 1-1		Example 2-1
	Glossy surface	Matte surface	Glossy surface	Matte surface	Glossy surface	Matte surface	Glossy surface	Matte surface
One	△	△	◎	◎	◎	◎	◎	◎
2	△	×	○	◎	◎	◎	◎	◎
3	○	○	◎	◎	◎	◎	◎	◎
4	△	△	○	○	◎	◎	◎	◎
5	○	○	△	△	◎	◎	◎	◎
6	△	△	△	△	◎	◎	◎	◎
7	×	×	×	×	◎	◎	◎	◎
8	△		◎		◎		◎
Judgment symbol ◎: Very good ○: Good △: Normal ×: Bad

As a result of the test, Examples 1 and 2 are all excellent in terms of color density at the time of writing, dropping at the time of erasing, initial erasing property, erasing of writing traces on the clearing film, and the like for the filter type marking pen ink. . In addition, it can be seen that Examples 1 and 2 are all superior in terms of long-term erasing property, erasing property of writing traces on the erasing coating film, and the like. Furthermore, it can be seen that such superiority is not related to the writing object.

Therefore, it can be seen that the present invention is applicable to various writing objects and marking pen types. In addition, when the present invention is applied to various writing objects and marking pens, it can be written easily and thickly so that the writing property is excellent, and it is easy to erase regardless of the period and the dust generation is also excellent because it can be seen that excellent eraseability.

The marking pen ink of the present invention is applicable to various writing objects and marking pen types, and thus has industrial applicability.

Claims (16)

1. An ink for marking pens comprising a pigment, an alcohol, a glycol ether solvent, a resin, a plasticizer, and a leveling agent, and having a viscosity of 12 to 15 cP.
2. The marking pen ink of claim 1, wherein the alcohol is at least one selected from lower alcohols having 1 to 4 carbon atoms.
3. The marking pen ink of claim 1, wherein the glycol ether solvent is at least one selected from ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and propylene glycol monoethyl ether.
4. The marking pen ink according to claim 1, wherein the resin is a resin dissolved in the alcohol and the glycol ether solvent.
5. The marking pen ink of claim 1, wherein the resin is at least one selected from ethylene vinyl acetate resin, cellulose resin, acrylic resin, glycerol rosin ester resin, and polyvinyl butyral resin.
6. The method of claim 1, wherein the plasticizer is polyethylene terephthalate (PET), glyceryl tribenzoate, diethylhexyl phthalate (DEHP), dibutyl phthalate (DBP), butylbenzyl phthalate (BBP), diisononyl phthalate (DINP) ), Di-ene-octylphthalate (DNOP), 2- (2- (2-phenylcarbonyloxyethoxy) ethoxy) ethyl benzoate, trimethylolpropane tri benzoate, isononyl benzoate, 1-methyl- 2- (2-phenylcarbonyloxypropoxy) ethyl benzoate, 2, 2, 4-trimethyl-1, 3-pentanediol dibenzoate, n-hexyl benzoate, isooctyl palmitate, acetyltributyl citrate (ABC; Acetyl Tributyl Citrate), tributyl citrate (TBC; Tributyl Citrate), dibutyl sebacate, triaryl phosphate, dimethylphthalate, dioctyl sebacate, dioctyl adipate, and isooctyl stearate Marking pen ink.
7. The ink pen of claim 1, wherein the leveling agent is at least one selected from silicone copolymers, glycerin fatty acid esters, and polyethylene waxes.
8. The ink pen of claim 1, wherein the alcohol is included in an amount of 45 wt% to 63 wt% and the glycol ether solvent is included in an amount of 5 wt% to 7 wt% with respect to the total weight of the ink.
9. The ink according to claim 8, wherein the pigment is contained in an amount of 5 to 8% by weight, and the resin is contained in an amount of 8 to 12% by weight based on the total weight of the ink.
10. The ink according to claim 8, wherein the plasticizer is included in an amount of 10 to 20% by weight, and the leveling agent is included in an amount of 1 to 3% by weight based on the total weight of the ink.
11. The marking pen ink of claim 1, further comprising at least one selected from an oil and a humectant.
12. 12. The marking pen ink of claim 11, wherein the oil is at least one selected from evening oil, grape seed oil, castor oil, and olive oil.
13. The ink pen of claim 11, wherein the humectant is at least one selected from polyol, polyhydric alcohol alkyl ether, and polyhydric alcohol aryl ether.
14. The marking pen ink of claim 1, further comprising at least one selected from a dispersant and an anti-drying agent.
15. 15. The method of claim 14, wherein the dispersing agent is alkylol ammonium salt of the multifunctional polymer, alkylol ammonium salt of the low molecular weight polycarboxylic acid polymer, alkylol ammonium salt of the block copolymer having an acidic group, alkyl ammonium salt of polycarboxylic acid, unsaturated An ink for marking pens, which is at least one selected from polyamine amide salts, oxirane polymers, modified acrylate copolymers, and nonylphenolethoxylates.
16. The marking pen ink of claim 14, wherein the drying inhibitor is at least one selected from polyglycerol fatty acid ester, glycerin, sucrose fatty acid ester, sucrose stearic acid ester, and polyglycerol ester.