KR100645399B1 - Synthesis of Polymeric Dispersants for Pigmented Mill-base using for TFT Color Filter - Google Patents

Abstract

The present invention relates to a polymer copolymer for pigment dispersant in the production of color filters, which is one of the main components of TF LCD, and more specifically, to mix monomers such as styrene, acrylate, methacrylic acid, acrylamide, The present invention relates to a polymer copolymer for pigment dispersants such as polymerized low viscosity and chemical resistance, a pigment dispersion using the same, and a TFT LCD color filter.

The present invention provides a polymer copolymer for pigment dispersant and a method for producing the same, wherein the monomers are polymerized and arranged regularly or irregularly.

(a) at least one monomer selected from the group consisting of styrene, benzylmethacrylate, 2-ethylhexyl methacrylate and 2-ethylhexyl acrylate;

(b) monomers which are methacrylic acid or acrylamide;

(c) at least one monomer selected from the group consisting of 2-hydroxy methacrylate, glycidyl methacrylate, methyl methacrylate and butyl acrylate.

In addition, the polymer copolymer is used to provide a pigment dispersion and a color filter for TF LCD color filter.

The present invention can be used in water-soluble and organic solvents, low-viscosity dispersion stability, chemical resistance, and can be applied to various types of pigments to provide a high color reproduction of TF Lsid and a photoresist of various uses and It can be applied to inkjet inks.

TF LCD, color filter, polymer copolymer for pigment dispersant

Description

Synthesis of Polymeric Dispersants for Pigmented Mill-base using for TFT Color Filter             

1 is a basic structure of the polymer copolymer for pigment dispersants of the present invention,

2 is a chemical structure of a polymer copolymer according to an embodiment of the present invention,

3 is a chemical structure of a polymer copolymer according to another embodiment of the present invention,

4 is a chemical structure of a polymer copolymer according to another embodiment of the present invention.

The present invention relates to a polymer copolymer for pigment dispersant in the production of color filters, which is one of the main components of TF LCD, and more specifically, a mixture of monomers such as styrene, acrylate, methacrylic acid and acrylamide The present invention relates to a polymer copolymer for pigment dispersants such as low viscosity and chemical resistance, and to pigment dispersions and TFT LCDs using the same.

Color filter sensitizer is an essential element in the reproduction of TFT LCD color. Three colors of red, blue, and green are coated on the color filter by the photosensitive method to transmit the light generated from the backlight, and to suit the three types of red, blue, and green light properly. In combination, it reproduces all colors of visible light. Therefore, the quality of the final color visible is determined by the quality of the color filter. In addition, the color filter depends on the quality and type of pigments and additives included in the photosensitizer, in particular red, green, and blue pigments must be dispersed in ultrafine particles in the solvent used in the photosensitizer, and colloidal state. Ultrafine particles should have properties that the dispersion stability should not change, even under physical and chemical adverse conditions.

In addition, the pigment dispersion of the color filter photosensitizer is currently supplied by Sanyo, Mikuni, Dainippon ink, etc. in Japan, and these companies manufacture and sell the pigment dispersion using a commercially available dispersant.

In addition, in the production of pigment dispersions, in order to maintain a stable dispersion system, the role of a dispersant, which is a kind of polymeric surfactant, is essential.

However, in recent years, TI's rapid technological innovation has introduced products such as high transmittance, high color, high brightness, and high contrast TFT LCD. As a result, the dispersion for color filter photosensitizers also requires many changes.

That is, in the case of the high-permeability color filter, which is an initial product, since the concentration of the pigment does not have to be high, a large amount of dispersant can be used compared to the amount of the pigment used. In this case, the dispersant is easy to disperse and maintain high dispersion stability. Could.

However, as the development of the LCD requires high color reproduction, a large amount of pigments must be laminated on the color filter for high color reproduction, and thus, the necessity of reducing the amount of dispersant in preparing the dispersion has emerged. However, when a small amount of dispersant is used, it is difficult to disperse and it is difficult to obtain dispersion stability of ultrafine particles. Accordingly, there is a need for a high-performance dispersant that can produce the same effect even with a small amount of use.

Dispersants currently commercialized seek versatility as acyl or urethane systems.

As a specific example, US Pat. No. 6,696,207 relates to a process for producing using a commercial dispersant, Efka-46, to prepare a dispersion for use in color filters. However, commercialized dispersants have the disadvantage that they are difficult to cope with each of the required properties in the pigment dispersion because they seek versatility.

In addition, even if the pigment having the same chemical structure of the same color index number, the physical properties of the pigment crystal surface is different according to the post-treatment process, even if the production company, even the same company is required according to the properties of the dispersant accordingly.

However, the conventional low-viscosity dispersants include the above-described brand name such as Efka, Solsperth, etc., but there is a limit to the general-purpose product to match the variety of pigment dispersions recently required.

In addition, since the pigment is usually used by dispersing, dispersion is very important, and since the dispersion is mainly used in paint to achieve high viscosity dispersion, the need for developing a low viscosity pigment dispersion is not high. Recently, however, the development of low viscosity dispersions has become very important. This is due to the recent increase in the use of pigments in chemical materials among electronic materials, the need for high functional low viscosity pigment dispersion. In particular, the color filter photoresist (photosensitive agent) used in the manufacture of the color filter for TFT LCD is a material in which a low viscosity pigment dispersion is very important. In addition, in order to improve the color filter manufacturing process, color filter inkjet ink, which is a substitute for photoresist, also has a low viscosity pigment dispersion. At the same time, the most important thing is that the physical properties of the dispersant required for the preparation of such low viscosity dispersions must be excellent, and the heat resistance, chemical resistance, and mechanical properties that maintain the strength beyond the specified level after curing must be satisfied. For example, in the color filter manufacturing process, a highly functional pigment dispersion liquid that can maintain stability of the dispersion system is required even in an ultra high temperature process of curing at 220 ° C. for 1 hour or more.

In addition, the physical properties of the color filter dispersion should also be diversified to meet the specific required physical properties of TF LCD. Conventional pigment dispersions have been typically used for the manufacture of pigment dispersions for spin coating, but as the size of the display increases, nowadays various properties are required for spin coating, printing with blades and rolls, and subsequent inkjet printing. . Pigment dispersions require the addition of many chemicals in order to be prepared as a photosensitizer and thus require chemical resistance. Typical chemicals added are photosensitizers, binders, surfactants, monomers and viscosity modifiers. However, when the pigment dispersion undergoes physical and chemical reactions with these additives and the like, the dispersion system is broken and hardened or separated, resulting in a loss of value as a commodity, or a defect in the display finished product, resulting in enormous losses. Therefore, the dispersant used to prepare the pigment dispersion requires, among other things, chemical resistance and high mechanical strength.

However, commercialized products are limited in the dispersion of various kinds of pigments because the specifications are limited.

Thus, to overcome the general limitations of commercialized dispersants, the present invention has invented high-performance dispersants that conform to the chemical and physical properties of pigments used throughout dispersant design and synthesis.

In addition, the present invention is to satisfy the dispersion stability and quality excellence simultaneously by designing and synthesizing the dispersant according to the characteristics of the dispersion that increasingly requires diversity and the pigments having different chemical and physical properties.

In order to overcome the above limitations, the present inventors intend to develop a polymer type dispersant that can be used in water-soluble and organic solvents using various types of monomers and can be applied to various types of pigments with low viscosity dispersion stability. And completed it.

Accordingly, an object of the present invention is (a) at least one monomer selected from the group consisting of styrene, benzylmethacrylate, 2-ethylhexyl methacrylate and 2-ethylhexyl acrylate; (b) monomers which are methacrylic acid or acrylamide; (c) polymerizing at least one monomer selected from the group consisting of 2-hydroxy methacrylate, methyl methacrylate and butyl acrylate to provide a polymer copolymer for pigment dispersant and a method of preparing the same.

In addition, another object of the present invention to provide a pigment dispersion for a TFT LCD color filter using the polymer copolymer and a color filter prepared therefrom.

In order to achieve the above object, the present invention provides a polymer copolymer for pigment dispersant, the monomers are polymerized and arranged regularly or irregularly.

(a) at least one monomer selected from the group consisting of styrene, benzylmethacrylate, 2-ethylhexyl methacrylate and 2-ethylhexyl acrylate;

(b) monomers which are methacrylic acid or acrylamide;

(c) at least one monomer selected from the group consisting of 2-hydroxy methacrylate, glycidyl methacrylate, methyl methacrylate and butyl acrylate.

The monomer polymerization molar ratio of said (a) :( b) :( c) is 0.3-3.0: 0.2-2.5: 0.3-3.0, The polymer copolymer for pigment dispersants is provided.

In addition, there is provided a polymer copolymer for pigment dispersant, wherein the molecular weight is 1,000 to 100,000.

In addition, in order to achieve another object, the present invention (a) 0.3 to 3.0 monomers selected from at least one selected from the group consisting of styrene, benzyl methacrylate, 2-ethylhexyl methacrylate and 2-ethylhexyl acrylate Mole; (b) 0.2 to 2.5 moles of a monomer which is methacrylic acid or acrylamide; And (c) 0.3 to 3.0 moles of a monomer selected from the group consisting of 2-hydroxy methacrylate, glycidyl methacrylate, methyl methacrylate and butyl acrylate in a multi-component monomer mixture reaction solvent, Heating in the range of 80 to 100 ° C. under an inert gas atmosphere of nitrogen or argon; And

0.1 to 10 parts by weight of an initiator 2,2'-azobisisobutyronitrile (AIBN) was added to 100 parts by weight of the heated multi-component monomer mixture, followed by polymerization at 80 to 100 ° C. under an inert gas atmosphere of nitrogen or argon. It provides a method for producing a polymer copolymer for pigment dispersant comprising the step.

In addition, in order to achieve another object, the present invention provides a pigment dispersion for a TFT LCD color filter comprising the polymer copolymer, a pigment and a dispersing aid.

In addition, the pigment is a color filter pigment red 254, red 177, blue 156, green 36, yellow 150, yellow 139, yellow 138, violet 23 for the TFT LCD color filter It provides a pigment dispersion.

In addition, the pigment dispersion liquid is used for a TFT LCD color filter photosensitizer or TF LCD color filter inkjet ink provides a pigment dispersion for TF LCD color filter.

Furthermore, the present invention provides a color filter prepared using the pigment dispersion.

Hereinafter, the present invention will be described in detail.

At this time, if there is no other definition in the technical terms and scientific terms used, it has a meaning commonly understood by those of ordinary skill in the art.

 In addition, repeated description of the same technical configuration and operation as in the prior art will be omitted.

The present invention relates to the synthesis of a polymeric dispersant for stabilizing commercially available pigments in an organic solvent having a slight polarity in the form of ultra fine particles, and in particular, the polymer copolymer for pigment dispersants of the present invention has excellent ability to stabilize at low viscosity. It shows the differentiation characteristics from the existing dispersing agent which stabilizes fine particles at high viscosity, and its excellent ability to disperse dispersion at low viscosity shows good effect in dispersing low viscosity ink or paint.

Thus, the present invention is a monomer having affinity with the benzene or alkyl group of the pigment styrene, benzyl methacrylate, 2-ethylhexyl methacrylate, 2-ethylhexyl acrylate and methacrylic acid having affinity with the solvent , Acrylamide and mechanically dispersible polymer dispersants in combination with monomers such as 2-hydroxy methacrylate, methyl methacrylate and butyl acrylate.

However, the monomer used in the present invention is not limited to only the monomers listed above.

At this time, in the case of the copolymer using glycidyl methacrylate, the hardness due to epoxy crosslinking during heat curing is excellent and chemical resistance is enhanced, thereby providing very excellent physical properties for manufacturing thermosetting inkjet ink for color filters.

The reaction solvent used in the synthesis of the polymeric dispersant may be reacted using both a protic solvent and an aprotic solvent except water. As a protic solvent, butyl alcohol, isopropyl alcohol, ethyl alcohol, etc. are used, and as an protic solvent, a propylene glycol monomethyl ether acetate, dipropylene glycol methyl ether acetate, diglyme, etc. are reaction solvents. In the process, it is very preferable that the dispersant synthetic solvent used in the preparation of the dispersion for color filters is synthesized in the protic solvent rather than the protic solvent.

The molecular weight of the polymeric dispersant required for the low viscosity pigment dispersion is very important, but the molecular weight ranges from 1,000 to 100,000, preferably from 5,000 to 50,000, and more preferably from 10,000 to 20,000. The molecular weight of the polymer is usually 100,000 to more than one million, but the polymer used as a low-viscosity dispersant is small to disperse low viscosity, and can be used in special environments requiring low viscosity such as color filter photosensitizer or color filter inkjet ink. Because it can.

That is, high viscosity dispersions are inherently difficult to manufacture low viscosity color filter inkjet inks or photosensitizers, but low viscosity dispersions can produce a wide range of products from low viscosity to high viscosity. The invention of a dispersant capable of producing a low viscosity dispersion liquid has a very important meaning because it can be prepared by addition.

In addition, since the inkjet ink for color filters requires a low viscosity of 3 to 10 cP, a low viscosity, high functional dispersant is an essential element for the manufacture of inkjet ink for color filters, and the dispersant developed in the present invention satisfies this condition. It can be called an invention.

At this time, the photosensitive agent or inkjet ink for the color filter is generally produced using the pigment dispersion of the present invention by a known method.

In addition, the molecular weight of the polymer to be synthesized is controlled according to the concentration and temperature during the reaction and the amount of the initiator used. That is, when the concentration, the reaction temperature is high and the amount of initiator is used, the molecular weight is small, and the reaction concentration is 5% to 60% of the total monomer amount by weight, preferably 10% to 40%, more preferably 15% to 30%. Let% be.

The reaction temperature is 50 to 120 ° C, preferably 60 to 100 ° C, more preferably 70 to 90 ° C, and 2,2'-azobisisobutyronitrile (AIBN) as a reaction initiator. To the total monomers used, 0,1 to 10% by weight, preferably 0.5 to 5%, more preferably 2 to 4% by weight.

Such a dispersion using the polymer copolymer of the present invention has a surface tension region of 30 to 40 dyne / cm suitable for inkjet ink application.

In addition, the polymer of the present invention is a random type polymer and has excellent efficacy in dispersing characteristics, and the synthesized polymer is pulverized in various grinders by removing a reaction solvent or mixing with an appropriate amount of pigment in the present state.

And, it depends on the type of pigment, but can be applied up to 20 to 150% of the weight of the pigment in general, the dispersing agent can be applied directly without solvent separation when synthesized in the aprotic solvent is very advantageous to shorten the process .

At this time, in the synthesis of the polymer dispersant, the structure itself is composed of three components having affinity with the organic material pigment, a part having affinity with the solvent, and a part having the mechanical properties of the dispersant itself as shown in FIG. You lose.

In the polymer copolymer of the present invention, the monomer of the moiety having affinity with the pigment is benzyl methacrylate, styrene, and the monomer of the mechanical property has 2-hydroxyethyl methacrylate, butyl methacrylate. The part which has affinity with a methyl methacrylate and a solvent contains methacrylic acid.

In this case, the use ratio of the monomers is different from the ratio and type according to the purpose to be applied, the optimum ratio and type should be first adjusted based on the polarity of the pigment, the desired viscosity, the characteristics of the solvent to be used. The dispersion stabilization mechanism is known to be due to the anion electrostatic repulsion of the carboxyl groups contained in the dispersant surrounding the pigment particles in the case of an aqueous solution, and to the steric hindrance effect of the dispersant surrounding the pigment particles in the case of an organic solvent. When used in an organic solvent, it is not necessary to introduce an anion, but the carboxyl or methacrylamide group of methacrylic acid in the structure is stabilized by having affinity with the organic solvent by hydrogen bonding, and steric hindrance between the pigment and the pigment surrounded by the dispersant The effect is to prevent contact and to have dispersion stability.

In the present invention, it is preferable that the pigment is pulverized into fine particles to use a powder form, which releases air adhering to the surface during dispersion, thereby providing a wetting effect that allows water or a solvent to penetrate the pigment surface well. Because.

The present invention will be described in detail with a simple example as follows.

Benzyl methacrylate, methyl methacrylate, and methacrylic acid were mixed well with propylene glycol monomethyl acetate as a reaction solvent at a molar ratio of 0.7, 0.5, and 1.5, respectively, and an initiator (AIBN) was added at about 100 ° C. After the reaction was carried out for 5 hours while maintaining the temperature, the solvent used was removed by vacuum distillation to obtain white crystals of a solid component. The synthesized dispersant has a chemical structure as shown in FIG.

At this time, in the chemical structure of Figure 2 X, Y, Z is a relative molar ratio X is 0.3 to 3.0, and Y is 0.2 to 2.5, it is preferable to use 0.3 to 3.0 for Z.

And, if necessary, two or more kinds of monomers having affinity with the pigment may be used. This is because it must be used within the molar concentration to reduce unreacted monomers during polymerization and excellent adhesion to the substrate, thereby exhibiting excellent characteristics in color formation.

In addition, if the reaction solvent is propylene glycol monomethyl acetate in the present invention has the advantage that can be applied directly without the need for solvent removal by vacuum distillation to shorten the process.

In addition, the three-dimensional structure and polarity of the dispersant may be adjusted according to the physical and chemical properties of the pigment applied as described above, which is determined by the type of the monomer used, the size of the molecular weight. For example, when 2-hydroxy methacrylate is used instead of methyl methacrylate, the steric structure and overall physical properties of the dispersant are shifted toward the polarity, and when used in combination with a highly polar pigment, dispersion stability tends to increase. Its chemical structure can be represented as in FIG.

In the chemical structure of Figure 3, the ratio of X, Y and Z is propylene glycol monomethyl as described above, and the reaction solvent used in the synthesis may be acetate or other types of protic organic solvents.

In addition, the prepared dispersant may be mixed with the pigment and the solvent to be used to undergo a wetting process, and may be a pigment dispersion of low viscosity by a grinding process using a bead mill or a microfluidizer. Pigment dispersions can usually be dispersed by adjusting the concentration of the pigment to about 15% of the total dispersion, the viscosity can be low viscosity of about 20cP can be used for color filter photosensitizer or color filter inkjet ink.

In addition, another example is to prepare a dispersant according to the method described above for styrene and butyl methacrylate, which are monomers currently used in general use. When the styrene, butyl methacrylate, and methacrylic acid in the molar ratio of 1.5, 0.5 and 0.3, respectively, were mixed with diglyme, an initiator was added at a reaction temperature of 80 ° C, and reacted for 4 hours to prepare a dispersant. It represents a polymer copolymer having a. In this case, the dispersant has a reduced polarity and shows excellent physical properties when mixed with a relatively weak polar pigment.

At this time, in the chemical structure of Figure 4 X, Y, Z is a relative molar ratio in the case of the dispersant used in the aqueous solution X is 0.3 to 3.0 and Y is 0.2 to 2.5, Z is 0.3 to 3.0, compared to the dispersant It is preferable to use methacrylic acid in half or less.

In addition, the organic solvent used in the reaction may be mixed with the pigments immediately without separation, and then subjected to a wet process, and then ground in a bead mill or a microfluidizer to prepare a pigment dispersion based on the organic solvent.

And this invention makes it possible to manufacture the dispersion liquid of low viscosity. This is because the low viscosity dispersion has the advantage of enabling the production of a product having a wide range of viscosities when applied to the manufacture of inkjet inks or photoresists for color filters.

On the other hand, the polymer copolymer, the pigment dispersion for the TFT LCD color filter prepared by the conventionally known method and pigments and dispersing aid is applied to the glass substrate according to the conventional pigment dispersion method and a colored pattern is formed by ultraviolet exposure. To produce a color filter.

Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the following examples, and it will be apparent to those skilled in the art that various changes or modifications can be made within the spirit and scope of the present invention.

Example 1

Benzyl methacrylate (0.07 moles, 12.3 g), methyl methacrylate (0.07 moles, 7.0 g), methacrylic acid (0.075 moles, 6.5 g) is mixed with 100 g of propylene glycol monomethyl ise acetate and a small amount of nitrogen Pass it through. After raising the mixture to 80 ° C., 0.28 g of an initiator (AIBN) was added thereto, followed by reaction for 5 hours while maintaining the temperature at 80 ° C. Nitrogen continues to pass through the reaction to prevent contact with oxygen in the air so that the produced radicals do not disappear. After 5 hours, slowly cool the temperature to room temperature. A dispersant solution containing about 20% solids was obtained.

Example 2

In the same manufacturing process of Example 1, styrene (0.07 mol, 7.3 g) was added to 80 g of propylene glycol monomethyl acetate instead of benzyl methacrylate and synthesized to disperse a solution containing about 20% solids. Got.

Example 3

In the same manufacturing process of Example 1, 2-hydroxyethyl methacrylate (0.07 mol, 9.1 g) was added to 110 g of propylene glycol monomethyl acetate instead of methyl methacrylate, and synthesized by about 20% of A dispersant solution containing solids was obtained.

Example 4

68 g of propylene glycol mono benzyl methacrylate (0.04 mol, 7.0 g), styrene (0.03 mol, 3.1 g) methyl methacrylate (0.07 mol, 7.0 g) and methacrylic acid (0.15 mol, 12.9 g) Methyl is mixed with acetate and passed a small amount of nitrogen. After the mixture was raised to 90 ° C., 0.28 g of an initiator (AIBN) was added thereto, followed by reaction for 5 hours while maintaining the temperature at 90 ° C. At this time, nitrogen continued to pass through the reaction to prevent contact with oxygen in the air so that the produced radicals did not disappear, and a solution having a solid content of 20% was obtained.

Example 5

Benzyl methacrylate (0.04 moles, 7.0 g), styrene (0.03 moles, 3.1 g) methyl methacrylate (0.05 moles, 5.0 g), methacrylic acid (0.03 moles, 2.6 g) 60 g of propylene glycol methyl This was mixed with acetate and passed a small amount of nitrogen. After raising the mixture to 80 ° C., 0.35 g of an initiator (AIBN) was added thereto, and the reaction was performed for 5 hours while maintaining the temperature at 100 ° C. At this time, nitrogen continued to pass through to prevent contact with oxygen in the air so that the produced radicals did not disappear.

Example 6

In the same manufacturing process of Example 5, instead of benzyl methacrylate, 0.07 mol 7.3 g of styrene was used to synthesize a polymer dispersant for an organic solvent.

Example 7

50 g of the polymer dispersant solution synthesized in Example 1 was mixed with 15 g of Swiss Ciba company Pigment Red No. 254 and 0.5 g of dispersing aid Solpus 22000, stirred well for 2 hours, and then wetted with 300 g of sand. A 7 cm diameter disc was used to grind at 3,000 rpm for 5 hours. When the grinding was completed, sand was removed using a pole to obtain a red pigment dispersion having an average particle size of 75 nm.

Then, the viscosity and the surface tension of the dispersion, which have a significant influence on the TFC, were measured.

At this time, the comparative example was mixed well 20g of Efka-46, 15g of Siva Co., Ltd. Pigment Red 254, 0.5g of dispersing aid Solsper 22000 and stirred well for 2 hours, wetted with 300g of sand and 7cm in diameter The disk was used for 5 hours at 3,000 rpm. When the grinding was completed, sand was removed using a shaft to obtain a red pigment dispersion having a mean particle size of 77 nm.

The results are shown in Table 1 below.

The present invention Comparative example Viscosity 3.5 5.5 Surface tension 33 35

Example 8

It was pulverized at rpm 3,000 for 3 hours using a 7 cm diameter disk, and when the grinding was completed, beads were removed using a pole. In this case, a red pigment dispersion having an average particle size of 80 nm, a viscosity of 4.1 cP, and a surface tension of 36 dyne / cm was obtained.

Example 9

In this example, the dispersion should be subjected to a stability test because the particles should not be crushed, precipitated or separated after being pulverized, and the double stability is observed over time using a particle size analyzer. Acceleration test was performed for observation, and the stability test over time was performed for 4 hours at 60 ° C. and 4 hours at −10 ° C. and repeated four times to observe the change in particle size.

As a result, as shown in Table 1, the polymer dispersion according to the present invention showed a good stability almost no change in size compared to the existing Efka product.

Invention (Example 7) Comparative example Before hard work 75 nm 77 nm After time stability test 78 nm 80 nm

As described above, the present invention can be used in water-soluble and organic solvents, low-viscosity dispersion stability, chemical resistance, and can be applied to a variety of pigments to provide a high-molecular color reproduction of TFT LCDs and various Application to photosensitive agents and inkjet inks has become possible.

Claims (8)

(a) at least one monomer selected from the group consisting of styrene, benzylmethacrylate, 2-ethylhexyl methacrylate and 2-ethylhexyl acrylate; (b) monomers which are methacrylic acid or acrylamide; And (c) at least one monomer selected from the group consisting of 2-hydroxy methacrylate, glycidyl methacrylate, methyl methacrylate and butyl acrylate; A polymer copolymer for pigment dispersant, polymerized in a monomer monomer molar ratio of (a) 0.3 to 3.0: (b) 0.2 to 2.5: (c) 0.3 to 3.0 and regularly or irregularly arranged. delete The method of claim 1, A molecular copolymer for pigment dispersant, characterized by a molecular weight of 1,000 to 100,000. (a) 0.3 to 3.0 moles of at least one monomer selected from the group consisting of styrene, benzylmethacrylate, 2-ethylhexyl methacrylate and 2-ethylhexyl acrylate; (b) 0.2 to 2.5 moles of a monomer which is methacrylic acid or acrylamide; And (c) 0.3 to 3.0 moles of a monomer selected from the group consisting of 2-hydroxy methacrylate, glycidyl methacrylate, methyl methacrylate and butyl acrylate in a multi-component monomer mixture reaction solvent, Heating in the range of 80 to 100 ° C. under an inert gas atmosphere of nitrogen or argon; And 0.1 to 10 parts by weight of an initiator 2,2'-azobisisobutyronitrile (AIBN) was added to 100 parts by weight of the heated multi-component monomer mixture, followed by polymerization at 80 to 100 ° C. under an inert gas atmosphere of nitrogen or argon. Method for producing a polymer copolymer for pigment dispersant, characterized in that it comprises a step. A pigment dispersion for a TFT LCD color filter comprising the polymer copolymer of claim 1, and a pigment and a dispersing aid. The method of claim 5, The pigment is a pigment dispersion for TF LCD color filter, characterized in that the pigment red 254, red 177, blue 156, green 36, yellow 150, yellow 139, yellow 138, violet 23 for the color filter . The method of claim 5, The pigment dispersion is a pigment dispersion for a TFT LCD color filter, characterized in that it is used in the inkjet ink for a TFT LCD color filter or a inkjet ink for a TFT LCD color filter. The color filter manufactured using the pigment dispersion of Claim 5.

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