KR100395147B1 - The white ink composite for marker-pen - Google Patents

Abstract

The present invention relates to a white ink for a marker pen, while increasing the content of the white pigment to obtain the desired whiteness, while improving the dispersibility and storage stability of the white pigment is possible long-term storage, in particular easy to spill ink In addition, the object of the present invention is to provide a white ink composition for marker pens excellent in erasability after writing. To achieve the above object, the present invention is a conventional pigment component based on titanium dioxide based on 100% by weight of the total composition. 20 to 30 weight percent; 1000 or less low-polymerization vinyl resin selected from polyvinyl butyral resin, polyvinylpyrrolidone, polyvinylacetate, vinyl acetate acrylic copolymer resin, and vinyl chloride vinyl acetate copolymer resin; Solvents selected from ethyl alcohol, propyl alcohol, isopropyl alcohol and mixtures thereof; A releasing agent selected from polyoxyethylene lauryl ether and polyoxyethylene oleincetyl; And an isooctyl stearate and an additive selected from dioctyl adipate, wherein the white ink composition for marker pens comprises 2 wt% to 7 wt% of the low-polymerization vinyl resin of 1000 or less. To provide a composition.

Description

White ink composition for marker pens {The white ink composite for marker-pen}

The present invention relates to a white ink for a marker pen, and more particularly, it is possible to obtain a desired whiteness by increasing the content of the white pigment, while improving the dispersibility and storage stability of the white pigment, which enables long-term storage. The present invention relates to a white ink composition for a marker pen that is easy to spill and excellent in erasability after writing.

Background Art Conventionally, blackboards used in classrooms, seminar rooms, conference rooms, and offices have black or green surfaces, and in recent years, green blackboards have been used to protect eyesight. It has been described.

However, in the process of writing or erasing letters using chalk on the blackboard, a large amount of chalk powder is generated and the interior is contaminated. Especially, the generated chalk powder easily penetrates into the human body during the breathing process and causes various lung diseases. There was a problem acting as.

Due to the above problems, a colored marker pen used for a white board or the like is known, and the marker pen has an ink solution embedded therein, and the ink solution is absorbed by an absorbent such as a sponge installed on the marker nib inside the marker pen. By letting out the pen through the pen tip to have the function of writing instruments.

In the above, the whiteboard has a white background color, and the marker pen for writing on the writing surface is written using various colors with good wipeability, but in general, when the background color is white, eyes are easily tired due to reflection of light. There is a problem that the learning effect is reduced due to disability.

In order to solve the above problems, the method of manufacturing white ink for marker pens of Korean Patent Application No. 94-9740 and the black ink composition and its manufacturing method of Japanese Patent Application No. 7-110554 are used as pigments. Titanium oxide is used and isopropyl alcohol and acetone as a vinyl resin, solvent, and polyoxyethylene lauryl ether, polyoxyethylene oleincetyl ether as a releasing agent, and isoctyl stearate and dioctyl adipate as other additives. Disclosed is a technique of manufacturing a white ink which enables writing using the prepared white ink on a green-based writing board by adding a white ink.

In more detail, in the method for preparing white ink for macaphen in Korean Patent Application No. 94-9740, 9 to 12 wt% of titanium oxide and 1 to 1.5 wt% of calcium carbonate are mixed and pulverized, and the vinyl resin is 1.5 to 1.8. By weight, 50 to 60% by weight of IPA (isopropyl alcohol) is mixed and heated in a hot bath at 95 to 110 ℃ for about 20 to 30 minutes to produce a mucus stock solution, and then ISO (isooctyl stearate) 8 to 11% by weight, 2.8 to 3.2% by weight of LA3 (polyoxyethylene lauryl ether), 0.8 to 1.2% by weight of EA3 (polyoxyethylene oleincetyl ether) and 10 to 12% by weight of acetone were added and mixed, followed by DOA (dioctyl). Adipate) discloses a technique for producing a white ink for a marker pen by adding and mixing 7 to 8.5% by weight.

In addition, in Japanese Patent No. 2524689, "Black ink composition and manufacturing method," 9 to 12 wt% titanium oxide, 0.9 to 1.2 wt% calcium carbonate, 1.8 to 2.2 wt% vinyl resin, 30 to 40 wt% Isopropyl alcohol, 8-11 wt% isooctylstearate, 2.8- 3.2 wt% polyoxyethylene lauryl ether, 0.8-1.2 wt% polyoxyethylene olecetyl ether, 30-40 wt% ethyl alcohol And 7 to 8.5 weights of dioctyl adipate and the like.

In general, marker pens white ink because of using on the board surface of the dark color of but a large amount of white pigment takes Because be sufficiently mask the dark color of the board surface, a white ink manufactured by the method described above is a white pigment TiO ₂ The content of 9 to 12% by weight is too low in the dark blackboard has a problem that the whiteness is too low to obtain a proper whiteness.

In particular, attempts have been made to increase the content of titanium oxide, a white pigment, from 20% to 30% by weight, but as the solids content increases, the viscosity increases along with the dispersion stability, in which sediment is formed during long-term storage. There were many problems, such as not done properly.

In addition, as the content of titanium oxide is increased, there is a problem in that the writing marks are not erased cleanly and remain in the process of erasing after writing using the prepared ink solution on the writing board, and thus the writing marks remain.

Accordingly, the present invention is to solve the above-mentioned problems, while improving the dispersibility and storage stability of the white pigment to obtain a desired whiteness by increasing the content of the white pigment, it is possible to long-term storage, in particular spilled ink It is an object of the present invention to provide a white ink composition for a marker pen which is not only easy but also excellent in erasability after writing.

In order to achieve the above object, the present invention comprises 20 to 30% by weight of a typical pigment component based on titanium dioxide based on 100% by weight of the total composition; 1000 or less low-polymerization vinyl resin selected from polyvinyl butyral resin, polyvinylpyrrolidone, polyvinylacetate, vinyl acetate acrylic copolymer resin, and vinyl chloride vinyl acetate copolymer resin; Solvents selected from ethyl alcohol, propyl alcohol, isopropyl alcohol and mixtures thereof; A releasing agent selected from polyoxyethylene lauryl ether and polyoxyethylene oleincetyl; And an isooctyl stearate and an additive selected from dioctyl adipate, wherein the white ink composition for marker pens comprises 2 wt% to 7 wt% of the low-polymerization vinyl resin of 1000 or less. To provide a composition.

In addition, in order to more effectively prepare the white ink composition, the present invention firstly dissolves and stirs while slowly adding 2 to 7 wt% of a low-polymerization vinyl resin of 1000 or less with respect to 100 wt% of the total composition in a stirrer containing a solvent. To the marker pen, the mixture is mixed with a releasing agent and other additives, and added by adding 20 wt% to 30 wt% of a common pigment mainly based on titanium dioxide, and stirred for 3 hours to adjust the viscosity to 30 mPas to 80 mPas. It provides a method for producing ink.

Hereinafter, a white ink composition for a marker pen of the present invention and a manufacturing method thereof will be described in detail.

In the present invention, the stirring is dissolved while slowly adding 2 to 7% by weight of the low-polymerization vinyl resin of 1000 or less with respect to 100% by weight of the total composition to the stirrer containing the solvent.

In the above solvent, an isopropyl alcohol solvent or various organic solvents that are commonly used may be used, and in particular, it is preferable to select and use a solvent capable of dissolving vinyl resin more effectively. Will be added.

As described above, a vinyl resin is added to improve coating properties of the ink prepared in the stirrer containing the solvent, adhesion to the writing plate surface, dispersion stability of the pigment, viscosity control and erasability of the ink, and in the present invention, a vinyl resin Low-polymerization vinyl resin was used.

In general, when a resin having a high degree of polymerization is used, the viscosity increases as the amount of the pigment is increased, so that ink is not easily spilled, and writing is not properly performed, and a small amount of resin is used for the purpose of maintaining an appropriate viscosity. When used, not only the dispersibility of the pigment is lowered, but also results in the use of a small amount of the pigment for the purpose of improving the dispersibility, a problem arises that the desired whiteness cannot be obtained.

However, in the present invention, by using a low-polymerization resin as a vinyl resin, it is possible to prepare an ink having a low viscosity even when the amount of the pigment is added to 20 to 30% by weight. Since the outflow is smooth, the film of the handwriting is thick, so that the whiteness is improved and the erasing property is excellent.

In particular, in order to sufficiently exhibit the effects described above, a low polymerization resin of 1000 or less is used. In this case, when the average molecular weight of the low polymerization resin exceeds 1000, the viscosity of the prepared ink is high so that the ink may not flow smoothly. Since the resin is generated, it is preferable to use a low polymerization resin having a low polymerization degree of 1000 or less.

In addition, when the addition amount of the low polymer resin is less than 2% by weight, the viscosity is low, the dispersion force of the pigment is lowered, causing the problem of precipitation and storage stability is reduced, when the viscosity of the prepared ink exceeds 7% by weight It is preferable that the amount of the low-polymerization resin is added in an amount of 2% by weight to 7% by weight since the problem of high flow of ink is not generated.

Examples of the low-polymerization vinyl resins that can be used include polyvinylbutiral resin, polyvinylpyrrolidone, polyvinylacetate, vinyl acetate acryl copolymer and vinyl chloride. Although vinyl acetate copolymer resin is used, in particular, when polyvinyl butyral resin is used, proper adhesiveness is given to the writing plate surface, and a solvent is volatilized after writing to form a film on the writing plate surface to improve the eraseability of the handwriting. Therefore, it is preferable to use polyvinyl butyral resin as a low polymerization vinyl resin.

In addition, polyvinyl butyral resin has excellent properties for dispersing pigments, thereby improving dispersibility of the prepared ink, and having excellent storage stability, and having a uniform color of handwriting after writing, thus improving color density. .

As described above, the vinyl resin is added to the solvent, followed by addition and mixing of a release agent and other additives, and 20 wt% to 30 wt% of the pigment is further added and dispersed and stirred for about 3 hours to adjust the viscosity to 30 mPas to 80 mPas.

In this case, as the mold release agent, polyoxyethylene lauryl ether and polyoxyethylene olecetyl ether, which are commonly used, are added within a conventional addition range, but other additives are commonly used isooctyl stearate and dioctyl adipate. Etc. can also be added and used within a normal addition range.

In addition, the pigment is used in 20% to 30% by weight, in this case can be used as a pigment that can be used all white pigments such as titanium oxide or calcium carbonate, but titanium oxide in consideration of the whiteness and gloss and dispersibility It is desirable to.

In particular, titanium oxide surface-treated with silica or alumina in titanium oxide is excellent in dispersibility and wet in an organic solvent. Therefore, it is preferable to use silica or alumina titanium.

In this case, it is preferable to use a pigment such as titanium oxide having an average particle size of 0.2 μm to 0.4 μm in order to increase the dispersibility of the solvent. In this case, when the average particle size is less than 0.2 μm, the hiding power is lowered and the whiteness is lowered. If it exceeds 0.4㎛ concealment force is good, but there is a problem that the dispersion force worsens.

In particular, in the above, the vinyl resin, the releasing agent and other additives were added to the solvent, and then the pigment was added, but the vinyl resin was added to the solvent, followed by the addition of the pigment to premix and disperse by passing through dynomil or tribonola. You may add a mold release agent and another additive here.

As described above, a vinyl resin, a releasing agent, other additives, and a pigment are added to the solvent, followed by dispersion stirring for about 3 hours to adjust the viscosity to 30 mPas to 80 mPas.

In this case, when the viscosity is less than 30 mPas, the viscosity of the prepared ink is low, so that dispersibility is lowered, and pigment precipitation occurs. When the viscosity is more than 80 mPas, the viscosity of the prepared ink is high, and the outflow of ink is poor. Since the problem of not being able to obtain the white concentration occurs, it is preferable to adjust the viscosity of the white ink to 30 mPas to 80 mPas.

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following description.

<Examples 1 to 7>

In a stirrer containing 400 g (≒ 312 ml) and 200 g (≒ 160 ml) of isopropyl alcohol as a solvent, the polyvinyl butyral resin as shown in Table 1 below was gradually added to the stirrer and dissolved in the solution. 100 g of polyoxyethylene lauryl ether and 30 g of dioctyl adipate were mixed with other additives, and 200 g of titanium oxide having a particle size of 0.3 μm was added thereto, followed by dispersion and stirring for 3 hours to prepare a white ink for a marker pen. Using the white ink prepared above was measured in the viscosity, outflow state, whiteness, storage stability and erasability by the following method is shown in Table 1.

- Viscosity -

Approximately 400 g of the ink prepared in a 50 ml beaker was added, and the temperature was adjusted to 25 ° C., and the TOKIMEC.BH viscometer used Rotor NO.1 to stop the viscometer rotating plate at two rotations at 20 rpm. It was.

-Spill Status-

Marker with NIB with a diameter of 5.0 mm and a porosity of 65% or more. Measure 10m line on a green board and measure the amount of ink consumed by 0.1mg. Then, if the ink consumption is more than 300mg per 10m, It was good and less than that. The specification for the ink consumption of macafen is 300 to 400 mg per 10 m.

-Whiteness-

Draw a 2cm square on the green board and paint the inside with chalk to make a standard specimen. In the same way as the standard specimen, draw a 2cm square on the green board and paint it with the marker ink solution prepared inside. After visual comparison with the standard specimen, it was determined as follows.

◎: Same color as standard specimen.

○: almost similar to the color of the standard specimen.

(Triangle | delta): It is inferior to the color of a standard specimen.

X: It is significantly shorter than the color of the standard specimen.

-Storage stability-

Take 10g of ink prepared in a built-in macapen container with 8mm diameter steel ball, assemble it, store it at room temperature for 2 months with the NIB upwards, and then drop the ball when the NIB of the macafen downwards. Storage stability was checked as follows.

(Double-circle): The NIB is directed downward and the ball falls.

(Circle): The ball falls when it shakes once or twice after making NIB face down.

(Triangle | delta): The ball falls when it shakes 3-4 times after making NIB face down.

×: The ball falls when the NIB is turned downward and shaken five times or more.

-Erased-

The green board was placed horizontally, and the stroke was spirally drawn with a maca pen containing ink prepared and left to dry at room temperature for 1 day, and then completely erased with a marker pen eraser.

◎: Cleared.

(Circle): A thin line mark looks weak.

(Triangle | delta): A peeling mark was seen and the peeling line was not partially erased.

X: The peeling line was not erased.

division Degree of Polymerization of Polyvinyl Butyral Resin Addition amount of polyvinyl butyral resin (g) Viscosity (mPas) Spill Whiteness Storage stability Erased Example 1 700 50 45 Good ◎ ◎ ◎ Example 2 1000 50 70 Good ◎ ◎ ◎ Example 3 1200 50 85 Bad △ △ △ Example 4 500 10 25 Good ○ × × Example 5 500 20 40 Good ◎ ◎ ◎ Example 6 500 70 70 Good ◎ ◎ ◎ Example 7 500 80 90 Bad × ○ ○

As shown in Table 1, Examples 1 and 3 carried out at the polymerization degree of 1000 or less within the scope of the present invention in Examples 1 to 3, which were added 50 g of the polyvinyl butyral resin addition amount and varying the degree of polymerization of the polyvinyl butyral resin, and In Example 2, it can be seen that the spilled state, whiteness, storage stability and erasing property are all excellent, but Example 3 carried out in excess of the polymerization degree of 1000 has a high viscosity as the degree of polymerization increases, and thus the outflow state is poor, It can be confirmed through Table 1 that both storage stability and erasure resistance are inferior.

In addition, in Examples 4 to 7 carried out within the scope of the present invention in Examples 4 to 7 carried out while varying the amount of polyvinyl butyral resin added while the degree of polymerization of the polyvinyl butyral resin was fixed at 500, the outflow state and the whiteness were shown. , It can be seen that the storage stability and erasing properties are all excellent, Example 4 carried out below the addition range of the present invention has a low viscosity because the addition amount of the resin is low, the outflow condition is good, but the dispersion of the pigment is not properly made storage stability It can be seen that the deterioration and the erasability is reduced, and Example 7 carried out beyond the range of addition of the present invention has a large amount of resin added, good dispersibility, good storage stability and erasability, but high viscosity and poor outflow condition. It can be confirmed through Table 1 that the whiteness is reduced.

As described above, the present invention improves the dispersibility and storage stability of the white pigment by increasing the content of the white pigment to obtain a desired whiteness, and is capable of long-term storage. It is a useful invention which provides the white ink composition for marker pens which is excellent in the erase property after doing so.

Claims (5)

20 wt% to 30 wt% of conventional pigment components mainly based on titanium dioxide, based on 100 wt% of the total composition; 1000 or less low-polymerization vinyl resin selected from polyvinyl butyral resin, polyvinylpyrrolidone, polyvinylacetate, vinyl acetate acrylic copolymer resin, and vinyl chloride vinyl acetate copolymer resin; Solvents selected from ethyl alcohol, propyl alcohol, isopropyl alcohol and mixtures thereof; A releasing agent selected from polyoxyethylene lauryl ether and polyoxyethylene oleincetyl; And isooctyl stearate and an additive selected from dioctyl adipate. The white ink composition for a marker pen, characterized in that the low-polymerization vinyl resin of 1000 or less 2% to 7% by weight. The white ink composition for a marker pen according to claim 1, wherein the low-polymerization vinyl resin is a polyvinyl butyral resin. The white ink composition for a marker pen according to claim 1 or 2, wherein the pigment is titanium oxide having a particle size of 0.2 µm to 0.4 µm. The white ink composition for a marker pen according to claim 3, wherein the titanium oxide is surface treated with silica or alumina. delete