KR100641875B1 - Liquid ink composition for marker pen and manufacturing method - Google Patents

Abstract

The present invention has a proper hiding power (whiteness) after writing on a blackboard, easy to spill the ink and excellent eraseability after writing, leaving no traces or stains due to residual oil, etc. excellent liquid marker composition for marker pens and long-term storage As the manufacturing method, the ink composition is 10 to 17% by weight acrylic resin, 20 to 30% by weight pigment, 35 to 57% by weight alcohol solvent, 5 to 10% by weight of nonionic surfactant and 8 to 15% by weight plasticizer It is composed of%, the production method of the acrylic resin in the range of molecular weight 1,000 ~ 100,000 and theoretical glass transition temperature (Tg) -30 ~ 10 ℃ weight of the acrylic resin synthesized by the solution-polymerized acrylic monomer in the alcohol base 35% to 57% by weight of an alcohol solvent was added to the%, 20-30% by weight of a titanium oxide pigment was added thereto, dispersed and stirred, followed by mixing 5% to 10% by weight of a nonionic surfactant and 8% to 15% by weight of a plasticizer. Under stirring It consists of.

Marker pen, ink composition

Description

Liquid ink composition for marking pens and a method of manufacturing the same             

1 is analysis data of an acrylic resin used in the present invention.

Figure 2 is a graph showing the average particle size distribution of the pigments used in the present invention.

3 is a crystal structure analysis data of the pigment used in the present invention.

4 is a graph showing the Tg analysis result of the acrylic resin used in the present invention.

5 shows the results of a test for erasability using the ink liquid according to the embodiment of the present invention.

The present invention relates to a liquid ink composition for a marker pen and a method of manufacturing the same, and more particularly, has a proper hiding power (whiteness) after writing on a blackboard, and is easy to leak ink, but has excellent eraseability after writing, resulting from residual oil, etc. It relates to a liquid ink composition for a marker pen excellent in long-term storage properties without any marks or stains and a method of manufacturing the same.

In general, black and green blackboard writing chalk, which is mainly used in schools and institutes, has been commonly used as solid white chalk using soft calcium sulfate or hard calcium carbonate that can be visually expressed well. However, if the chalk was written on the blackboard and then erased, a large amount of chalk powder was generated, which not only exacerbated indoor pollution but also detrimentally affected the human respiratory system.

Therefore, instead of using white chalk powder on a black or green blackboard, a colored marker pen for a white board has been developed and widely used in which a certain amount of liquid ink is distributed and visualized on various types of white board. However, when the colored marker pens were written on a white board on a white background, not only the visual impairment due to the light reflection but also the degradation of the learning effect due to the accumulation of visual fatigue could be caused. In addition, it may cause indoor environmental pollution due to scattering of the pigment particles, etc. when writing after using a colored marker pen.

In general, an important technique for marker pen ink is the degree of concealment that can conceal the surface of the blackboard, that is, the degree of whiteness, the eraseability after writing or the marks and stains left on the surface of the blackboard, the degree of leakage of the ink solution from the marker pen, and also Storage stability, environmental impact and economical value when commercialized. Therefore, these technical elements should be considered in solving the above problems associated with the conventional marker pen.

Specifically, referring to the prior art related to a marker pen, Japanese Patent No. 2524689 discloses 9 to 12% by weight of titanium oxide as a pigment, 0.9 to 1.2% by weight of calcium carbonate, 1.8 to 2.2% by weight of a vinyl resin as a resin, and a solvent. A technique for "black ink composition and preparation method" consisting of 30-40% by weight of isopropyl alcohol (IPA) and other additives has been disclosed.

However, in the case of the white ink manufactured by the method of the Japanese patent, the amount of the pigment used in relation to the total weight is too low, there is a problem of insufficient hiding power and whiteness of the blackboard surface after writing.

In addition, the Republic of Korea Patent No. 133125 (patent of Dec. 16, 1997) "Method for producing white ink for marker pens" 9 to 12% by weight of titanium oxide and 1 to 1.5% by weight of calcium carbonate mixed and pulverized therein vinyl resin 1.5 to 1.8 wt% of IPA and 50 to 60 wt% of IPA were mixed and heated in a hot bath at 95 to 110 ° C. for about 20 to 30 minutes to form a mucus stock solution, followed by 8 to 11 weight of IOS (isooctyl stearate). %, LA ₃ (polyoxyethylene lauryl ether) 2.8 to 3.2% by weight, EA ₃ (polyoxyethylene oleincetyl ether) 0.8 to 1.2% by weight and acetone 10 to 12% by weight were added and mixed, then DOA as a plasticizer (Dioctyl adipate) The manufacturing method of the white ink for marker pens characterized by adding and mixing 7-8.5 weight% is disclosed.

Republic of Korea Patent Publication No. 1999-51745 "Method for producing color ink for marker pen" 2.0 to 4.0% by weight of vinyl butyral polymer, 12.0 to 15.0% by weight of dioctyl adipate, 17 to 20% by weight of isopropanol Synthesize the%, react for 3 to 5 hours at a temperature of 70 ~ 100 ℃ to form a base solution, add 0.8 to 6.0% by weight of modified polyacrylate, and add 3.5 to 6.0% by weight of any color pigment After adding 1.0 to 3.0% by weight of polylefin, mixed and ground using a high speed dispersion mill at a temperature of 40 to 65 ° C, 12 to 13% by weight of isopropanol, 34 to 37% by weight of wine spirits, Disclosed is a method for producing a color ink for a marker pen, characterized in that 0.3 to 0.7% by weight of penta stearate is added.

In addition, the Republic of Korea Patent No. 364510 "Composition of white ink for marker pen" in the white ink composition for marker pens composed of 10 to 30% by weight of pigment and vinyl resin, solvent, mold release agent and other additives with respect to 100% by weight, the release Zero phthalate esters, monobasic esters of fatty acids having 6 or more carbon atoms and aliphatic alcohols, polyoxyethylene alkyl nonylphenyl ethers of up to 8 HLB (Hydrophile Lipophile Balance), polyoxyethylene alkyl ethers of up to HLB 8 and up to HLB 8 Disclosed is a white ink composition for a marker pen, comprising a mixture of at least one selected from phosphate esters of polyoxyethylene alkyl ethers and aliphatic dibasic esters having a molecular weight of 300 or more.

In addition, Korean Patent No. 395147, "Composition of White Ink for Marker Pen", contains 20 to 30 wt% of conventional pigment components based on titanium dioxide, polyvinyl butyral resin, and polyvinylpyrrole based on 100 wt% of the total composition. Polyoxyethylene, solvent selected from up to 1000 low-polymerization vinyl resins selected from pig, polyvinylacetate, vinyl acetate acrylic copolymer resin, vinyl chloride vinyl acetate copolymer resin, ethyl alcohol, propyl alcohol, isopropyl alcohol and mixtures thereof A white ink composition for a marker pen composed of a releasing agent selected from lauryl ether, polyoxyethylene oleincetyl, and an additive selected from isooctyl stearate and dioctyl adipate, wherein the low-polymerization vinyl resin having a low polymerization degree of 1000 or less is 2% by weight. Disclosed is a white ink composition for a marker pen, characterized in that it comprises from 7% by weight to .

Lastly, Korean Patent Publication No. 2004-31424, "Color Ink Composition for Marker Pen", contains 2.0 to 4.0 wt% of vinyl butyral polymer, 12.0 to 15.0 wt% of dioctyle adipate, and isopropanol. 17-20 wt%, modified polyacrylate 0.8-6.0 wt%, color pigment 3.5-6.0 wt%, polyolefin 1.0-3.0 wt%, isopropanol 12-13 wt%, wine spirit 34-37 wt%, penta It disclosed a color ink composition for a marker pen, characterized in that it comprises 3 to 5% by weight of polymer liquid silicone, 3 to 7% by weight of polyamide in 0.3 to 0.7% by weight of stearate (pentastearate).

However, in the case of Korean Patent No. 133125, Patent Publication No. 1999-51745, Patent No. 364510, Patent No. 395147, and Patent Publication No. 2004-31424, the hiding power and the whiteness after writing showed good results, but compared to the total ink solution. When the content of the oil component is large and then erased after writing, the oil component remains on the surface of the blackboard, resulting in a problem of staining on the blackboard.

This problem is caused by the chemical imbalance caused by the selection and blending of the composition and the ratio of the ink composition and the inconsistency of the reaction conditions, and the user of the marker pen needs to periodically wipe it with a mop or an alcoholic solvent. Is given.

In addition, the domestic patent used the vinyl-based resin proposed in the Japanese prior patent as the most important resin of the ink manufacturing material for marker pens, and in addition to such a vinyl-based resin by adding various additives, the additional cost is required and the process and It was uneconomical in terms of cost.

The above problems will be overcome by the optimum selection and formulation of the compositional components and the component ratios of the ink composition and the matching of the optimum reaction conditions.

Accordingly, the present invention is to provide an ink composition and a method of manufacturing the same, which can be used universally, including existing blackboards based on steel, while solving and solving the problems of the prior art.

The present invention has a proper hiding power (whiteness) after writing on the blackboard, and easy to spill ink, but excellent eraseability after writing, leaving no traces or stains due to residual oil, etc., excellent long-term storage, economical and environmental pollution problems An object of the present invention is to provide a liquid ink composition for a marker pen and a method for producing the same.

In addition, the present invention is economical by using the acrylic resin that is used universally as the main raw material of the liquid ink for marker pen, and minimizes the use of other additives, and has excellent effects in writing and erasability even when used in the existing blackboard. An object of the present invention is to provide a liquid ink composition for a marker pen and a method for producing the same.

In order to achieve the above object, the liquid ink composition for marker pens according to the present invention is 10 to 17% by weight acrylic resin, 20 to 30% by weight pigment, 35 to 57% by weight alcohol solvent, nonionic surfactant 5 ~ 10 weight percent and plasticizer 8-15 weight percent.

Marker pen ink composition according to the present invention is preferably composed of a solid content concentration of 65% by weight or less.

The most important resin as an economical raw material in terms of cost and most suitable for the use and characteristics of the liquid ink for a marker pen according to the present invention is an acrylic resin polymerized in solution using an acrylic monomer which is widely used and easily available. That is, the acrylic resin which has a carboxyl group in the terminal group was selected.

In addition, the method for preparing a liquid ink composition for a marker pen according to the present invention is an acrylic resin synthesized by solution polymerization of an acrylic monomer in an alcohol base, having a molecular weight distribution of 1,000 to 100,000, and a theoretical glass transition temperature (Tg) of -30 to 10 ° C. 35 wt% to 57 wt% of an alcohol solvent is added to ˜17 wt%, and 20 to 30 wt% of a pigment selected from titanium oxide, more preferably rutile type and anatase type titanium oxide, is dispersed and stirred as an inorganic pigment. Then, 5 to 10% by weight of the nonionic surfactant and 8 to 15% by weight of the plasticizer is added, mixed and stirred.

Each component of the liquid ink composition for a marker pen according to the present invention and the manufacturing method thereof will be described in more detail as follows.

1. Acrylic resin

The acrylic resin used in the liquid ink composition and the manufacturing method for the marker pen of the present invention, after adding one selected from the acrylic monomer and 1-10% of the catalyst, that is, peroxide and azo catalyst in the Kettle Charge reactor, Obtained by solution polymerization in alcohol (C _{1 ~} C ₁₀ ) base at a reaction temperature of 70 ~ 100 ℃ for 8-11 hours.

The acrylic monomers are acrylamide (AM; acrylamide; CH ₂ = CHCONH ₂ ), methacrylic acid (MAA; methacrylic acid; CH ₂ = C (CH ₃ ) COOH), acrylic acid (AA; acrylic acid; CH ₂ = CHCOOH ), Methyl methacrylic acid (MMA; methyl methacrylic acid; CH ₂ = C (CH ₃ ) COOH), butyl acrylate (BA; buthyl acrylate; CH ₂ = CHCOOCH ₂ CH ₂ CH ₂ CH ₃ ), styrene monomer (SM ; styrene monomer; CH ₂ = CH (C ₆ H ₅ )), 2-ethylhexylacrylate (2-EHA; 2-ethyl hexyl acrylate; H ₂ C = CHCO ₂ CH ₂ CH (C ₂ H ₅ ) (CH ₂ ) ₃ CH ₃ ), and 2-hydroxyethyl methacrylate (2-HEMA; 2-hydroxyethyl methacrylate; H ₂ C═C (CH ₃ ) CO ₂ CH ₂ CH ₂ OH); This is a solution polymerization in alcohol base to synthesize an acrylic resin.

Typical IR (Fourier Transform Infrared Spectroscopy; PERKIN ELMER, SPECTRUM ONE, USA) analysis data of the synthesized acrylic resin is shown in FIG. 1. The carboxyl group was confirmed in the vicinity of 1600-1700 cm <^-1> .

2. Pigment

The properties required as the pigment used in the present invention include optical properties such as whiteness, hiding power, coloring power, dispersibility into a medium, weather resistance, and the like. Titanium oxide is suitable to meet such a requirement.

Titanium oxide is classified into three types, anatase type, rutile type and brookite type, depending on the crystalline form.The optical properties of titanium oxide include the refractive index, particle size, particle size distribution and dispersion of pigments. And the pigment volume ratio in the coating film. In order to maximize the optical properties of the titanium oxide pigment, it is important that each pigment particle is well dispersed in a medium such as a solvent or a resin used.

In addition, the particle surface is coated with a hydrous oxide such as aluminum, silicon, or titanium for the purpose of improving affinity to the medium and improving durability. In such a pretreatment process, the properties of titanium oxide adsorption, charge, and the like vary depending on the type of surface treatment agent.

In order to improve the optical properties such as dispersibility to the media, weather resistance and the like, in addition to the optical properties such as the whiteness, hiding power, and coloring power mentioned above, the titanium oxide selected from the rutile type and anatase type is pretreated using a hydrous oxide or the like. By adjusting the particle size distribution and particle size after the process, it was possible to maximize the object of the present invention, the amount was used 20 to 30% by weight relative to the total ink. The particle size is appropriately 1 ~ 5 ㎛ size selected from rutile type and anatase type.

The average particle size distribution of these pigments (model name ANKERSMID, CIS-100, Netherlands) and crystal structure (model name Mac Science, MXP 3A-HF22, JAPAN) were measured by instrumental analysis and are shown in FIGS. 2 and 3. As shown in Fig. 2 and Fig. 3, the shape of the pigment crystal structure used in the examples was anatase, and the average particle diameter distribution range of the pigment particles was 2.69 mu m.

3. Plasticizer

In the preparation of the ink composition for marker pens of the present invention, the plasticizer is written on the blackboard using ink, so that a thin film film of resin, that is, a resin film, is formed on the surface of the writing board according to the volatilization of the solvent, and the handwriting eraseability In other words, it is used to improve the erasability, to improve the processability of the resin and to change the physical properties.

Plasticizers usable in the present invention are dioctyl sebacate (DOS), di-2-ethylhexyl maleate (DOM; di-2-ethyl hexyl maleate), dioctylphthalate (DOP; dioctyl phthalate), dialkyl Adipate (D610A; dialkyl adipate), diethyl phthalate (DEP; diethyl phthalate) and dioctyl adipate (DOA; dioctyl adipate), and iso octyl stearate (IOS) Select and use one or two kinds of inexpensive used materials. The amount used is in the range of 8 to 15% by weight based on the total weight of the ink composition.

4. Nonionic Surfactants

Nonionic surfactants used in the present invention are polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene octyl ether, poly A mixture of one or two of oxyethylene tridecyl ether, polyoxyethylene lauryl ester, polyoxyethylene oleyl ester, polyoxyethylene stearyl ester, and polyoxyethylene coconut fat ester is selected and used. The amount used is in the range of 5 to 10% by weight based on the total ink composition weight.

Surfactant Name Structure color importance (20 ℃) pH moisture (%) HLB Polyoxyethylene Lauryl Ether 4 ₁₂ H ₂₅ -O (C ₂ H ₄ O) _n H G-1 0.92-1.06 5 ~ 7 0.5 8.3-18.4 Polyoxyethylene Oleyl Ether C ₁₈ H ₃₅ -O (C ₂ H ₄ O) _n H G-5 0.89-1.03 5 ~ 7 0.5 4.9 ~ 14.2 Polyoxyethylene Cetyl Ether C ₁₆ H ₃₃ -O (C ₂ H ₄ O) _n H G-1 0.87 ~ 1.06 5 ~ 7 0.5 5.4-18.0 Polyoxyethylene Stearyl Ether C ₁₈ H ₃₇ -O (C ₂ H ₄ O) _n H G-1 0.86-1.04 5 ~ 7 0.5 4.9-16.6 Polyoxyethylene Octyl Ether C ₈ H ₁₇ -O (C ₂ H ₄ O) _n H G-1 0.90-1.03 5 ~ 7 0.5 5.1-17.4 Polyoxyethylene Tridecyl Ether C ₁₂ H ₂₄ -O (C ₂ H ₄ O) _n H G-1 0.94-1.03 5 ~ 7 0.5 10.5-14.4 Polyoxyethylene Lauryl Ester C ₁₁ H ₂₃ COO (C ₂ H ₄ O) _n H G-4 0.99-1.01 5 ~ 7 0.5 9.4 ~ 14.9 Polyoxyethylene Oleyl Ester C ₁₇ H ₃₃ COO (C ₂ H ₄ O) _n H G-10 0.95-1.06 5 ~ 7 0.5 7.7-14.5 Polyoxyethylene Stearyl Ester C ₁₇ H ₃₅ COO (C ₂ H ₄ O) _n H G-4 0.98-1.04 5 ~ 7 0.5 7.9-15.5 Polyoxyethylene Coconut Fatty Ester C ₁₂ H ₂₅ COO (C ₂ H ₄ O) _n H G-5 1.00-1.05 5 ~ 7 0.5 7.3 ~ 14.9

5. Alcohol solvent

The alcohol solvent used in the present invention has little toxicity to humans, maximizes solubility with acrylic resins and dispersibility with pigments, and uses a relatively low odor compared to other solvents. In general, isopropyl alcohol or ethanol is used, and the amount is 35 to 50% by weight based on the total ink composition weight in consideration of the outflow rate and outflow amount of the writing instrument.

Hereinafter, the present invention will be described with reference to specific examples.

Example 1 Performance Evaluation According to Tg of Acrylic Resin

In order to select an acrylic resin suitable for showing the properties of the liquid ink composition for a marker pen of the present invention, an acrylic resin having a glass transition temperature (Tg) in the range of -50 to 40 ° C is selected as shown in Table 2 below. An ink composition was prepared.

That is, 44 wt% of an alcohol solvent is added to 12 wt% of the acrylic resin within the glass transition temperature range, and 26 wt% of a pigment selected from rutile type and anatase type titanium oxide in inorganic pigment is added, dispersed, and stirred, and then 8% by weight of the nonionic surfactant and 10% by weight of the plasticizer was added, mixed and stirred to prepare.

Evaluation items according to the embodiment is based on the following items.

(1) Viscosity: For the viscosity measurement of the present invention, 400 mL of the prepared ink was taken into a 500 mL beaker and measured using a viscometer (BROOKFIELD, RVDV-II ⁺ , USA).

(2) Outflow state: The outflow state of the prepared ink was evaluated by confirming the initial time at which ink began to flow out of the marker pen by pressing a marker pen nib having a constant pore at a predetermined time interval.

(3) Whiteness: Specimens were prepared on the surface of 15 cm wide and 5 cm long green boards, which were normally used, and written on the surface under the same conditions. Whiteness was visually determined as follows.

       ◎: Very good whiteness

       ㅇ: Excellent whiteness

       △: whiteness deterioration

        X: white is also very bad

(4) Dispersibility and storage stability: The degree of solid-liquid layer separation such as pigments, solvents, and additives that appears when the prepared ink is placed in a sample test tube for one week to check the dispersibility of the prepared liquid ink for the marker pen. The degree of solid-liquid layer separation, such as pigments, solvents, and additives, which appeared when left for 3 months to determine storage stability was determined.

       ◎: Very good: Layer separation 0 ~ 3 mm or less

       ㅇ: Excellent: Separation 4 ~ 6 mm or less

       △: bad: layer separation 7 ~ 10 mm or less

       X: Very bad: Separation more than 11 mm

(5) Eraseability: The green board which is commonly used is made of 15cm long and 5cm long specimens, and written on the surface under the same conditions, left for 1 hour at room temperature, dried, and then erased once with a normal blackboard eraser. The residual evaluation of the oil remaining on the specimen was visually determined and the evaluation of the erasure was determined as follows.

      ◎ very good: very clean.

      ㅇ: Excellent: Cleared but with some marks.

      (Triangle | delta): Falling: The writing mark is clear and has an indelible part.

      X: Very bad: Writing marks are very clear and white ink is contaminated on the surface.

(6) Residual oil: The commonly used green chalkboard is made of specimens of 15cm in width and 5cm in length, written on the surface under the same conditions, left for 1 hour at room temperature, dried, and then gradually erased with a normal blackboard eraser. Residual oil evaluation was visually judged as follows.

       ◎: Little or no residual oil

       ㅇ: A certain amount of residual oil is distributed

       △: much residual oil is distributed

        X: Very high residual oil distribution

     Item  Tg Spill Whiteness (Hidden Force) Dispersibility Erased Storage stability Residual oil Tg: 40 X X X X X X Tg: 20  △  △   X X △ ㅇ Tg: 2  ◎  ㅇ  ㅇ  ◎  ◎  ◎ Tg: -16  ◎  ◎  ◎  ◎ ◎  ◎ Tg: -30  ◎  ◎  ◎  ◎  ◎  ◎ Tg: -50  ◎  △  △ X X X

As shown in the above table, as Tg is lower than 2, it shows excellent performance, but when Tg is less than -30, problems with storage stability and erasability, residual oil, and whiteness due to layer separation occur, thus serving as marker pen ink. Could not be achieved enough.

4 is a Tg analysis result of a synthetic acrylic resin having a glass transition temperature (Tg) of -16 ° C in an embodiment of the present invention using a thermogravimetric analysis method (PERKIN ELMER, DSC-7, USA). It is shown.

Example 2: Performance Evaluation According to Mixing Ratio

Usage of Each Ingredient (g)      Example   Furtherance S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8 S-9 Surfactant (g) 60 60 60 50 70 100 60 60 60 Plasticizer (g) 80 80 80 100 70 50 80 80 80 Acrylic resin (g) 90 120 80 100 90 70 100 130 70 Pigment (g) 200 200 200 200 200 200 200 200 200 Alcohol solvent (g) 350 360 330 350 350 340 390 370 330 (G) 780 810 750 800 780 760 890 840 740

Performance Evaluation by Composition Ratio

    Item  turn Viscosity (cP) Spill (sec) Whiteness (Hidden Force) Dispersibility Erased Storage stability Residual oil S-1 94 27 ◎ ◎ ◎ ◎ ◎ S-2 89 24  ◎  ◎ ◎  ◎  ㅇ S-3 82 21  ㅇ ◎ ◎ ◎ ◎ S-4 82 21 ㅇ  ◎ ◎ ◎ ◎ S-5 55 12  ㅇ  △ ◎ △ X S-6 40 8  △  △ X X X S-7 49 10  △  X ◎ X ◎ S-8 69 16  △  ㅇ ◎  ㅇ ◎ S-9 112 40 ◎ ◎  ◎  ◎  △

As shown in Table 3, as a result of evaluating the performance of the liquid ink for the marker pen prepared by changing the composition component of the composition according to the weight ratio, acrylic resin 11.5-14.8 which is a mixture composition of Examples S-1 and S-2 Whiteness, dispersibility, erasability, storage stability and oil residue at weight%, pigment 24.7 to 25.6 weight%, alcohol solvent 44.4 to 44.87 weight%, nonionic surfactant 7.4 to 7.7 weight% and plasticizer 9.9 to 10 weight% It turns out that all are also excellent.

5 is a result of confirming the eraseability using the ink solution prepared in Examples S-1 to S-9. In the ink solution prepared according to the blending design of this example, it was confirmed that S-6 was very inferior in erasability. On the other hand, in the case of S-1 and S-2, the erasure property was very good.

When the acrylic ink is used in less than 10% by weight in the liquid ink composition of the present invention, as the ratio of the pigment is relatively high, the staining is hard to be erased when the writing surface is erased after writing due to a decrease in cohesion of the resin and the pigment particles. In addition to this, problems such as storage stability were caused by layer separation of the solvent and the pigment. In addition, when it exceeds 17% by weight it can be seen that the poor outflow state of the ink solution from the marker pen and the eraseability after writing decreases as the viscosity increases.

In addition, when the pigment is added in less than 20% by weight, the opacity after writing is reduced, and when it is added in excess of 30% by weight due to the degradation of the bond between the pigment and the resin, the problem of contamination of the pigment after writing, that is, staining occurs when erased Showed problems.

In case of less than 8% by weight of plasticizer, there was a problem of erasability due to the increase of adhesion of ink solution on the writing surface after writing.If it exceeds 15% by weight, the residual oil remains seriously on the writing surface. Showed problems.

In addition, when less than 5% by weight of the non-ionic surfactant was used as the deterioration of the moisturizing effect after the writing was found to be poor eraser, when exceeding 10% by weight showed a problem of contamination of the blackboard.

Finally, when the alcoholic solvent is added below 35% by weight, the outflow condition becomes poor due to the increase in the viscosity of the liquid ink.When it exceeds 57% by weight, the outflow state of the ink solution is good, but after writing There was a problem that the sharpness, that is, the whiteness decreases and the storage stability is lowered.

Liquid ink composition for a marker pen of the present invention from the above embodiment is 10 to 17% by weight of acrylic resin, 20 to 30% by weight of pigment, 35 to 57% by weight of alcohol solvent, 5 to 10% by weight of nonionic surfactant And when the plasticizer is comprised in the range of 8 to 15% by weight, it can be seen that the effects such as whiteness, outflow of the ink liquid from the marker pen, storage stability of the ink liquid, and eraseability after writing.

As described above, the liquid ink composition for a marker pen according to the present invention has a proper hiding power after writing on a blackboard, and is easy to spill out of ink, and has excellent eraseability after writing, leaving no marks or stains due to residual oil, etc. Excellent sex and no pollution problem.

In addition, the present invention is very economical by using the acrylic resin that is used universally as the main raw material of the liquid ink composition and minimizes other additives, and shows excellent effects in writing and erasability even when used in the existing blackboard A liquid ink composition for a marker pen and a method of manufacturing the same are provided.

Claims (3)

Select one or more of acrylamide, methacrylic acid, acrylic acid, methylmethacrylic acid, butyl acrylate, styrene monomer, 2-ethylhexyl acrylate and 2-hydroxyethyl methacrylate and solution polymerization them in an alcohol base. Synthetic acrylic resin, having a molecular weight distribution of 1,000 to 100,000 and a glass transition temperature (Tg) of 10 to 17% by weight of acrylic resin, 20 to 30% by weight of titanium oxide pigment, 35 to 57% by weight of alcohol solvent , Polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene octyl ether, polyoxyethylene tridecyl ether, polyoxyethylene lauryl ester, polyoxy Group consisting of ethylene oleyl ester, polyoxyethylene stearyl ester and polyoxyethylene coconut fat ester These 1 to 2 mixture of a nonionic surfactant 5-10% by weight marker and a plasticizer consisting of 8-15% by weight of the liquid ink composition for pens. delete Select one or more of acrylamide, methacrylic acid, acrylic acid, methylmethacrylic acid, butyl acrylate, styrene monomer, 2-ethylhexyl acrylate and 2-hydroxyethyl methacrylate and solution polymerization them in an alcohol base. As the synthesized acrylic resin, 35 to 57% by weight of an alcohol solvent was added to 10 to 17% by weight of an acrylic resin having a molecular weight distribution of 1,000 to 100,000 and a glass transition temperature (Tg) of -30 to 10 ° C. 30 wt% was added, dispersed and stirred, and then polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene octyl ether, polyoxyethylene tridecyl ether , Polyoxyethylene lauryl ester, polyoxyethylene oleyl ester, polyoxyethylene stearyl ester and polyoxyethylene Connaught patty 1 to 2 mixture of a nonionic surfactant selected from the group consisting of ester 5-10% by weight of a plasticizer into an 8 to 15% by weight mixture, marker pens method for producing a liquid ink composition which consists in stirring.

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