KR20100024139A - Marking ink composition for detecting defect of polarizing plate - Google Patents

Abstract

PURPOSE: A marking ink composition for detecting defects of a polarizing plate is provided to prevent the blockage of a nozzle head in a marking apparatus, to be dried within 10 seconds after marking defects, and to improve visibility. CONSTITUTION: A marking ink composition for detecting defects of a polarizing plate comprises an acrylic binder resin 0.1-13 weight%, fluorescent pigment 0.1-5 weight%, solvent 80-99.5 weight% and additive 0.01-3 weight% based on the marking ink composition 100.0 weight%. The solvent comprises at least one of an alcohol-based solvent 5-11 weight%, ketone-based solvent 50-60 weight%, and acetate-based solvent 25-28.5 weight%.

Description

Marking ink composition for defect detection of polarizing plate {MARKING INK COMPOSITION FOR DETECTING DEFECT OF POLARIZING PLATE}

The present invention relates to a marking ink composition for detecting a defect of a polarizing plate, and more particularly, in the inspection step of detecting whether there is a foreign material or a defect in the obtained polarizing plate in performing a polarizing plate manufacturing process, An ink composition for marking in an inkjet manner.

In the manufacturing process of sheet-shaped products such as synthetic resin film and sheet, defects are automatically detected by the inspection apparatus in the process of conveying the sheet-shaped products, and marking is performed on the defects detected at the rear end in the conveying direction. In the post process, the marking is removed and the defective part is removed or repaired.

Detecting and marking defects are performed by processing an image obtained by an imaging means such as a CCD to recognize a defect, and according to the conveyance speed and the size of the defect of the sheet-shaped product, By activating and marking the defects.

Conventionally, as such a marking method, a marking method using a felt pen and a marking method using an inkjet method have been proposed. According to the felt pen marking method, it is necessary to move the felt pen from the standby position to the marking position, but it is not easy to move the felt pen quickly and accurately, and the marking of the defective part of the sheet-shaped product becomes obscure or inaccurate. In addition, if the driving device is made large in order to move the felt pen quickly, the distance between the felt pens adjacent to each other on the marking head becomes wider, and there is a problem that a sheet-shaped product having a large area must be removed even for minute defects. Mainly used.

However, even with the inkjet method, the use of quick-drying ink tends to cause clogging of the nozzle head, which necessitates frequent cleaning of the head end portion, and in the case of using the dry-drying ink, the sheet Since the shape product has to be dried separately, there is a problem that the process speed is slow.

In particular, in order to perform marking on the polarizing plate used in the liquid crystal display device among the sheet-shaped products, although it is necessary to use a prominent so-called visibility, which is visible as marking ink, until now, in consideration of drying speed and other characteristics, As a black pigment, such as carbon black, the problem that the visibility falls with respect to the surface of the polarizing plate of the same black system was raised large.

The present invention is to solve the above problems, an object of the present invention is to provide an ink composition for inkjet marking for polarizing plate which is excellent in visibility, short drying time, and can perform accurate marking.

The present invention is to solve the above problems, the marking ink composition for detecting a defect of the polarizing plate according to the present invention, 0.1 to 13% by weight of the acrylic binder resin in 100% by weight of the total composition; Fluorescent pigment 0.1 to 5% by weight; 80-99.5 wt% solvent; It comprises 0.01 to 3% by weight of the additive.

Here, the said acrylic binder resin is methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, and cyclohexyl ( Meta) acrylate, 2-hydroethylethyl (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1 , 3-propylene glycol di (meth) acrylate, ethylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanedioldi (meth) acrylate, cyclohexane-1 Consisting of polymers or copolymers comprising at least one of -4-dimethanedioldi (meth) acrylate, trimethylophanephandi (meth) acrylate, and hydrogenated bisphenolate (meth) acrylate for adhesion and solvent It is preferable in view of the solubility.

In addition, the fluorescent pigment is xanthene, phthalocyanine, anthraquinone, perylene, carbazole, monoazobenzimidazolone, isobenzimidazolone, isoindolinone, monoazonaphthol, diaryldepyrazolone, rhoda At least one of min, indigoid, quinacridone, diazopyrantone, dinitrianiline, pyrazolone, dianisidine, pyrantrone, tetrachloroisoindolino, dioxazine, monoazoacrylate, and anthrapyrimidine It is preferable in order to provide the ink composition with high visibility with respect to a polarizing plate.

In addition, the fluorescent pigment is preferably made of at least one of Bassonyl Red 485, Bassonyl Red 540, Bassonyl Red 560 in order to obtain better visibility.

In addition, the solvent is made of at least one of an alcohol solvent, a ketone solvent, and an acetate solvent, 100% by weight of the marking ink composition for detecting a defect of the polarizing plate, the alcohol solvent is 5 to 11% by weight; The ketone solvent is 50 to 60% by weight; The acetate solvent is preferably 25 to 28.5% by weight in order to prevent clogging of the nozzle head of the inkjet device with quick-drying properties.

Here, it is preferable that the alcohol solvent is methanol, the ketone solvent is methyl ethyl ketone, and the acetate solvent is composed of ethyl acetate and ethylene glycol butyl ether acetate, because it can better express the properties of the ink composition. .

In addition, the additive is preferably composed of at least one of an antifoaming agent, an antistatic agent, a foaming agent, a thixotropic agent, a wax, a plasticizer, an emulsion, a binder, an antioxidant, a leveling agent, a photoinitiator, and a dispersant in order to improve desired properties of the ink composition.

According to the present invention, in performing a polarizing plate defect detection operation by inkjet marking, there is no clogging phenomenon of the nozzle head of the marking apparatus, and dried within 10 seconds after the defect marking, the polarizing plate for excellent visibility of the defect marking deposited on the polarizing plate An ink composition for inkjet marking can be obtained.

Hereinafter, the present invention will be described in more detail.

1 is an explanatory diagram showing a marking apparatus for performing polarizing plate marking by using a marking ink composition for detecting a defect of a polarizing plate according to the present invention.

As shown in FIG. 1, when the marking apparatus according to the present invention is examined, the sheet-shaped polarizing plate 10 is taken by the CCD camera 20 while being transferred in the direction of the arrow, and the image processing is performed by the inspection apparatus 30. Is carried out.

When a defect or foreign matter is detected in the polarizing plate 10, a signal is transmitted from the inspection device 30 to the driving device 40. The driving device 40 is connected to an ink filling tube 50 filled with the ink composition according to the present invention, a solenoid 60 for discharging the ink composition, and a nozzle head 70 opened and closed according to the solenoid operation. .

When the defect detection signal is transmitted from the inspection device 30 to the driving device 40, the nozzle head 70 is opened, the solenoid 60 is operated, and the ink composition filled in the ink filling tube 50 is sprayed to polarize the plate. After marking at the defect position above (10), the nozzle head 70 is closed. Since the operation time of the solenoid 60 is very short (20 ms or less), the ink composition can be discharged quickly.

As the characteristics of the ink composition used in the marking device, as described above, the polarizing plate should have excellent visibility, short drying time, and the ink composition should not cause clogging of the nozzle head 70. In the following description, a marking ink composition for detecting a defect of a polarizing plate according to the present invention having the above characteristics will be described.

100 weight% of marking ink compositions for polarizing plate defect detection by this invention are 0.1-13 weight% of acrylic binder resin; Fluorescent pigment 0.1 to 5% by weight; 80-99.5 wt% solvent; It comprises 0.01 to 3% by weight of the additive.

The acrylic binder resin according to the present invention is selected in consideration of the adhesion to the polarizing plate, the solubility in the solvent used in the present invention, the compatibility with the fluorescent substance used in the present invention, and the like (methyl) methacrylate. , Ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, cyclohexyl (meth) acrylate, 2-hydroethylethyl (meth) acrylic Rate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,3-propylene glycol di (meth) acrylate, ethylene Glycoldi (meth) acrylate, 1,4-butanedioldi (meth) acrylate, 1,6-hexanedioldi (meth) acrylate, cyclohexane-1,4-dimethanedioldi (meth) acrylate, Trimethyloffophandi ( It consists of a polymer or copolymer containing at least one of a meth) acrylate and a hydrogenated bisphenol adi (meth) acrylate. In addition, a material obtained by simply mixing the monomers may be used.

The acrylic binder resin used in the present invention is preferably contained in an amount of 0.1 to 13% by weight, more preferably 5 to 11% by weight, in 100% by weight of the marking ink composition for detecting a polarizing plate defect according to the present invention. Preferably it is 8-10 weight% content. When the acrylic binder resin is added in less than 0.1% by weight, there is a problem that the adhesion with the polarizing plate is lowered, and when added in excess of 13% by weight, the ink composition according to the present invention is the nozzle head of the marking device There is a problem that it is attached to 70 to cause the nozzle head clogging phenomenon.

The said fluorescent pigment consists of a material excellent in visibility from the surface of a black series polarizing plate, when the marking ink composition for polarizing plate defect detection by this invention was discharged and adhered to the polarizing plate. In addition, when mixed with the components of the whole composition, the drying time is short, it was selected as a material that can prevent the nozzle head clogging phenomenon. In addition, as the fluorescent pigment, a material capable of emitting fluorescence in the visible light region rather than the ultraviolet region was selected.

As such fluorescent pigments, magenta dyes, cyan dyes and yellow dyes may be used, and specifically, xanthene, phthalocyanine, naphthoquinone, anthraquinone, perylene, carbazole, benzylidene, monomethineoxonol, Monoazobenzimidazolone, isobenzimidazolone, isoindolinone, monoazonaphthol, diarylydepyrazolone, rhodamine, indigoid, quinacridone, diazopyrantrone, dinitrianiline, pyrazolone Any one of pyridine, dianisidine, pyrantrone, tetrachloroisoindolino, dioxazine, monoazoacrylate and anthrapyrimidine dye may be used alone or in combination of two or more thereof.

More preferably, any one of red or purple dyes such as Bassonyl Red 485, Bassonyl Red 540, and Basonyl Red 560 may be used alone or in combination of two or more thereof.

Each of the fluorescent dyes may be dyes that develop colors of yellow, magenta, and cyan when a part of the chromophore is dissolved. In this case, the counter cation may be present as an inorganic cation such as an alkali metal or ammonium, or an organic cation such as pyridinium or a quaternary ammonium salt or may be a polymer cation having a cation as part of the structure.

The fluorescent dye used in the present invention is preferably added in an amount of 0.1 to 5% by weight, more preferably 0.2 to 2% by weight, in 100% by weight of the marking ink composition for detecting a defect of the polarizing plate according to the present invention. To create. When the fluorescent dye is added in less than 0.1% by weight, there is a limit in expressing color, and when added in excess of 5% by weight, when the ink composition according to the present invention obtained in combination with other components is sprayed. As the fluorescent dye of the inorganic component is excessively included, there is a problem that the nozzle head may be cured and cause nozzle head clogging.

In the marking ink composition for detecting a defect of a polarizing plate according to the present invention, the solvent controls viscosity and volatility to improve adhesion when the marking ink composition is deposited on the polarizing plate and to prevent nozzle head clogging. It can be used to exhibit characteristics.

Therefore, the properties of the ink composition will be adjusted according to the appropriate kind of solvent and their content. As a result of the study for obtaining the ink composition having the best properties, the solvent used in the present invention was obtained.

Examples of the solvent used in the present invention include water; Alcohol solvents such as methanol, isopropyl alcohol (IPA) and ethanol; Ketone solvents such as methyl ethyl ketone, cyclohexanone and acetone; Ether solvents such as aromatic hydrocarbons, isophorone, butyrolactone, N-methyl pyrrolidone, tetrahydrofuran, lactate and acetate; Ethyl acetate, propylene glycol monomethyl ether acetate (PM acetate), diethylene glycol ethyl ether acetate (DE acetate), ethylene glycol butyl ether acetate (EB acetate), dipropylene glycol monomethyl acetate (DPM acetate), isoalkyl esters, Any one or two or more of the ester solvents such as isohexyl acetate, isoheptyl acetate, isooctyl acetate, isononyl acetate, isodecyl acetate, isododecyl acetate, isotridecyl acetate or other isoalkyl esters Can be used.

In the present invention, the alcohol solvent is used to increase the solubility of the entire composition, and the ketone-based, ether-based and ester-based solvents are applied in order to exhibit fast drying properties.

The content of the solvent used in the present invention is 100% by weight of the marking ink composition for detecting a defect of a polarizing plate according to the present invention, wherein the alcohol solvent is 5 to 11% by weight, preferably 8 to 10% by weight; The ketone solvent is 50 to 60% by weight, preferably 55 to 59.5% by weight; The acetate-based solvent is 25 to 28.5% by weight, preferably 26 to 28% by weight of the composition is mixed, when the solvent is formulated in the mixing ratio according to the above range, excellent adhesion by adjusting the viscosity, clogging phenomenon of the nozzle head It will have a property to prevent.

Especially preferably, methanol is used as the alcohol solvent, methyl ethyl ketone (MEK) is used as the ketone solvent, and the acetate solvent is obtained by mixing ethyl acetate (EA) and ethylene glycol butyl ether acetate (EBA). Solvent is used. By using methanol, precipitation of the fluorescent pigment can be prevented from the nozzle head, and methyl ethyl ketone and ethyl acetate can be used to increase the drying speed. However, when the solvent is composed of only methanol, methyl ethyl ketone, and ethyl acetate, since the volatility is high, the ink composition may remain in the nozzle head after use, resulting in precipitation. Thus, the boiling point of ethylene glycol butyl ether acetate is 190 ° C. or higher. By mixing the (EBA) to form the composition, such a nozzle head clogging phenomenon can be prevented.

In the present invention, in addition to the above-described configuration, any one of antifoaming agents, surface tension regulators, antistatic agents, foaming agents, thixotropic agents, waxes, plasticizers, emulsions, binders, antioxidants, leveling agents, dispersants, alone or in combination It can be mixed and used.

As the antifoaming agent, a chelating agent represented by a fluorine-containing compound, a silicon compound and EDTA can be used as necessary.

Examples of surface tension modifiers include nonionic, cationic or anionic surfactants. The surface tension of the ink composition of the present invention is preferably 20 to 60 mN / m, more preferably 25 to 45 mN / m. The viscosity of the inkjet recording ink composition of the present invention is preferably adjusted to 3 to 5 cP (centipoise).

Examples of surfactants are preferably anionic surfactants such as fatty acid salts, alkyl sulfate salts, alkylbenzenesulfonic acid salts, alkylnaphthalenesulfonic acid salts, dialkylsulfosuccinic acid salts, alkyl phosphate salts, naphthalenesulfonic acid formalin concentrates, polyoxy Ethylenealkyl sulfate salts and the like; And nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylenealkyl allyl ethers, polyoxyethylene fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylenealkylamines, glycerin fatty acid esters, oxy Ethyleneoxypropylene block copolymers and the like.

Hereinafter, the characteristic is examined based on the experiment example regarding the marking ink composition for polarizing plate defect detection by the said this invention.

Experimental Example

To produce a marking ink composition for detecting a defect of a polarizing plate according to the present invention consisting of the components, contents as shown in Table 1 below, and sprayed it in an inkjet method on a polarizing plate separated from a distance of 1.2m, the temperature is 20 ℃ and 30 ℃ The thickness of the polarizing plate was set to 1 mm and 2 mm, respectively, and the drying time at the time of drying 3 times at 25 rpm in the above conditions was measured. In addition, in evaluating the characteristic value about the ink composition obtained by the said experiment example, the viscosity was measured using Rheometrics SR-200 (made by Rheomatic Scientific Inc.), and surface tension was Krss K at room temperature. It was measured by the plate method using a -12 processor surface tension meter.

Table 2 is a table showing the results of the drying.

Furtherance ingredient weight% Remarks Acrylic binder resin Methyl methacrylate / ethyl methacrylate copolymer 6.91  Average molecular weight: 13,000 Fluorescent pigment Bassonil Red 540 0.30 C.I Basic violet 10 series   menstruum Methanol 9.08 Boiling Point (b.p) 64 ℃ Solubility 700g / L Methyl ethyl ketone 57.61 b.p 79 ℃ Solubility 50g / L Ethyl acetate 24.82 b.p 75 ℃ Solubility 45g / L Ethylene Glycol Mono-n-Butyl Ether Acetate 1.14 b.p 195 ℃ additive Antifoam 0.01 Silicone Defoamer Antistatic agent 0.13 Cationic Quaternary Ammonium Sum 100

Experiment number Polarizer thickness (mm) Temperature (1: 20 ℃, 2: 30 ℃) Drying time (seconds) One One One 4.2 2 2 One 8.6 3 One 2 2.8 4 2 2 3.03 5 One One 4.5 6 2 One 9.2 7 One 2 2.12 8 2 2 4.03 9 One One 4.4 10 2 One 9.6 11 One 2 2.54 12 2 2 4.93

As shown in Table 2, when the marking ink composition for detecting a polarizing plate defect according to the present invention is used, it can be confirmed that the drying time of the polarizing plate is dried between 2 seconds and 10 seconds.

Moreover, as a result of evaluating the viscosity, surface tension, and filtering diameter about the ink composition obtained by the said experiment example, the viscosity was 3-4 cP, the surface tension was 28 mN / m, and the filtering diameter was 0.2 micrometer. As a result, the marking ink had a suitable viscosity and surface tension, and in particular, the filtering diameter was small, and the nozzle head clogging phenomenon was prevented to a minimum.

2A and 2B are photographs showing a state in which a marking ink composition for detecting a defect of a polarizing plate according to a comparative example and the above-described experimental example of the present invention is discharged onto a polarizing plate, respectively.

As shown to FIG. 2A and FIG. 2B, when the marking ink composition for polarizing plate defect detection by this invention is compared with that of a comparative example, it can confirm that visibility is much superior.

It has been described in detail above with reference to preferred embodiments and comparative examples of the present invention. However, the scope of the present invention is not limited to the above embodiments, but may be embodied in various forms of embodiments within the appended claims. Without departing from the gist of the invention as claimed in the claims, any person skilled in the art to which the invention pertains is considered to be within the scope of the claims of the invention to the various possible modifications possible.

1 is an explanatory view showing a marking apparatus for performing a polarizing plate marking using a marking ink composition for detecting a defect of a polarizing plate according to the present invention.

2A and 2B are photographs showing a state in which a marking ink composition for detecting a defect of a polarizing plate according to a comparative example and the above-described experimental example of the present invention is discharged onto a polarizing plate, respectively.

Claims (7)

In 100% by weight of the marking ink composition for detecting a polarizing plate defect, 0.1 to 13% by weight of an acrylic binder resin; Fluorescent pigment 0.1 to 5% by weight; 80-99.5 wt% solvent; Marking ink composition for detecting a defect of a polarizing plate comprising 0.01 to 3% by weight of an additive. The method of claim 1, The said acrylic binder resin is methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, and cyclohexyl (meth) Acrylate, 2-hydroethylethyl (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,3 -Propylene glycol di (meth) acrylate, ethylene glycol di (meth) acrylate, 1,4-butanedioldi (meth) acrylate, 1,6-hexanedioldi (meth) acrylate, cyclohexane-1,4 A polarizing plate defect gum comprising a polymer or a copolymer comprising at least one of dimethanediol di (meth) acrylate, trimethyloffopandi (meth) acrylate, and hydrogenated bisphenolate (meth) acrylate Marking ink composition for application. The method of claim 1, The fluorescent pigment may be xanthene, phthalocyanine, anthraquinone, perylene, carbazole, monoazobenzimidazolone, isazobenzimidazolone, isoindolinone, monoazonaphthol, diaryldepyrazolone, rhodamine, Indigoid, quinacridone, diazopyrantrone, dinitrianiline, pyrazolone, dianisidine, pyrantrone, tetrachloroisoindolino, dioxazine, monoazoacrylate, anthrapyrimidine Marking ink composition for detecting a polarizing plate defect. The method of claim 3, The fluorescent pigment is a marking ink composition for detecting a polarizer defect, characterized in that made of at least one of Bassonyl Red (Basonyl Red) 485, Bassonyl Red 540, Bassonyl Red 560. The method of claim 1, The solvent is composed of at least one of an alcohol solvent, a ketone solvent, and an acetate solvent, In 100% by weight of the marking ink composition for detecting a polarizing plate defect, The alcohol solvent is 5 to 11% by weight; The ketone solvent is 50 to 60% by weight; Marking ink composition for detecting a defect of the polarizing plate, characterized in that the acetate solvent is 25 to 28.5% by weight. The method of claim 5, The alcohol solvent is methanol, the ketone solvent is methyl ethyl ketone, and the acetate solvent is ethyl acetate and ethylene glycol butyl ether acetate. The method according to any one of claims 1 to 6, The additive is a defoaming agent, antistatic agent, foaming agent, thixotropic agent, wax, plasticizer, emulsion, binder, antioxidant, leveling agent, photoinitiator, dispersant marking ink composition, characterized in that at least one consisting of.

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