KR20070006271A - Dust free protection film - Google Patents

Abstract

A protecting film is provided to suppress the generation of static electricity when the protecting film is separated from an adhesive, thereby preventing the adhesion of foreign particles onto the protecting film, by forming the protecting film to have antistatic layer. A protecting film comprises a transparent base film(10), a transparent antistatic layer(11), and a release layer(12). The transparent antistatic layer is formed on one surface or both surfaces of the base film. The transparent antistatic layer uses a conductive polymer as an effective component. The release layer is formed on the base film or the antistatic layer.

Description

Foreign matter protection film {DUST FREE PROTECTION FILM}

1 is a cross-sectional view of one embodiment of a protective film according to the present invention.

2 is a cross-sectional view of another embodiment of a protective film according to the present invention.

3 is a cross-sectional view of another embodiment of a protective film according to the present invention.

4 is a cross-sectional view of another embodiment of a protective film according to the present invention.

5 is a cross-sectional view of another embodiment of a protective film according to the present invention.

The present invention relates to the invention of a protective film or a protective film (hereinafter referred to as a protective film) that is excellent in antistatic performance, does not adhere to foreign materials, and is easily adhered (or adhered to, referred to as adhesive) and separation.

A typical backlight unit used for a liquid crystal display is a backlight unit used in a protective film. The backlight unit is assembled to a metal frame in a structure of a reflective sheet, a light guide plate, a diffusion film, and a prism film light protection sheet. After assembly, the adhesive is used to assemble the panel with the liquid crystal injected panel. The adhesive is usually attached to the frame of the backlight, which uses a protective film to protect the adhesive and prevent foreign matter from entering the backlight during transportation. The protective film is removed when the panel and backlight are glued together, generating hundreds of volts of static electricity when the release protective film is removed from the adhesive. The generated static electricity adsorbs the surrounding foreign matter and adheres to the backlight, the liquid crystal panel, and the protective film. This foreign matter is a defect that should not be found in the liquid crystal display.

The protective film as described above can reduce the generation of static electricity through antistatic treatment or can properly dissipate the generated static electricity. For this treatment, the protective film must be treated with an effective antistatic agent.

Common antistatic treatments include carbon black, surfactant type antistatic agents, or treatment with metal oxides and coating of metals and conductive oxides. First, carbon black is impossible to use due to the occurrence of particle impurities and opaque black, and the surfactant type antistatic agent is limited because its performance is dependent on water, and disappears over time and causes staining. In addition, treatment with metal oxides, coating or sputtering metals and conductive oxides, and antistatic treatments using plasma or ion beams require high unit cost or low antistatic performance, respectively, and conductive oxides themselves. Since the foreign matter is likely to fall off the protective film due to friction during use. In addition, the methods have a characteristic that the use of the backlight protection film is limited because the visible light transmittance is low.

Therefore, to use as a protective film for the liquid crystal display backlight, it has a permanent antistatic performance, excellent visible light transmittance, there is no change in the antistatic performance over time and the development of a protective film without the generation of foreign objects is required.

The present invention is to solve the problems as described above is to provide a protective film that is easy to bond and detach the static electricity generated less static electricity and effectively eliminates the static electricity generated, and do not adhere to the foreign matter, the active polymer is an active ingredient The conductive coating solution is coated on one side or both sides of a protective film such as a backlight, and the surface to be attached to the adhesive relates to a protective film that has been released.

The protective film as described above has less than 100V of static electricity generated, the generated static electricity is extinguished within 3 seconds, foreign matter does not stick at all, and also has a transparent permanent antistatic performance.

The present invention relates to a protective film that is excellent in antistatic performance and has a small amount of static electricity generated when the protective film is removed from the adhesive, and the generated static electricity is effectively dissipated so that no foreign matter is attached.

In other words, the protective film according to the present invention is to achieve the above object by performing an antistatic treatment and a release treatment by using a conductive polymer as an active ingredient on one or both sides of the base film.

Protective film according to the present invention is a transparent base film; A transparent antistatic layer formed on one side or both sides of the base film and using a conductive polymer as an active ingredient; And a release layer formed on one surface of the base film or the antistatic layer. Including, it is easy to stick and remove, and has a transparent antistatic and foreign matter prevention function.

Protective film according to the present invention is a transparent base film; A transparent antistatic layer formed on one side or both sides of the base film and using a conductive polymer as an active ingredient; And a release layer formed on one surface of the antistatic layer, wherein the antistatic layer is formed by an ultraviolet curing method, and is easily attached and removed, and has a transparent antistatic and foreign material prevention function.

In the above protective film according to the present invention, the protective film is formed on one surface of the antistatic layer, the antistatic layer and the release layer is combined into one layer to form a single antistatic and release layer And, the antistatic and release layer is a conductive polymer, poly 3,4-ethylene dioxy thiophene polymer and a release agent having good usability with the conductive polymer is mixed with an ultraviolet curing binder and UV-cured to provide excellent visible light transmittance and impurities It is characterized by the lack of performance.

In order to achieve the above object, in the present invention, several methods of manufacturing a protective film may be selected. First, an antistatic treatment containing a conductive polymer as a main component on one side of the base film of the protective film and a release treatment on the opposite side thereof may be performed. The second method is to apply anti-static treatment to one surface of the base film of the protective film and then to give a release property on the upper surface of the protective film. The third method is to simultaneously apply a conductive material and release property to coat one surface of the base film. The second method is to apply the antistatic treatment on both sides of the base film and then re-coat the release agent on one side. The fifth method is to apply the antistatic treatment on one side of the protective film and simultaneously add the release agent and antistatic performance on the other side. It is possible.

The transparent permanent antistatic protective film will be described in detail with reference to the drawings. 1 to 5 show various embodiments of the protective film according to the present invention.

First, the protective film according to the embodiment of Figure 1 is the most effective and the process can be easily produced, the conductive polymer having a transparent permanent antistatic performance on one surface of the base film 10 used as a raw material of the protective film The antistatic layer 11 having the active ingredient is formed on the opposite side is a protective film formed with a release layer 12 with a release agent. The protective film of this embodiment has an antistatic treatment on the back side where the adhesive is attached, but when viewed from the effect, even when the protective film is removed, the static electricity generated through humans is grounded even if the antistatic treatment occurs on the back side. Low voltage and generated static electricity can be effectively dissipated. The antistatic layer 11 for the antistatic can be used both thermal curing and ultraviolet curing method using a conductive polymer. When the thermosetting method is used, a system for curing the binder used in the composition may have excellent durability, and the ultraviolet curing method may form a warning antistatic layer having excellent solvent resistance.

In the protective film according to the embodiment of FIG. 2, an antistatic layer 11 is formed on the one surface of the base film 10 as an active ingredient, an antistatic treatment is performed, and a release layer 12 is formed thereon. The protective film according to the embodiment is excellent in antistatic performance and also excellent in releasability. However, the film produced in this way may be damaged when the conductive layer is imparted, and is easily erased by a solvent such as alcohol during use. This is because when the antistatic film treated with the conductive polymer coating is coated with alcohol, At this time, the applicable technique is to use the ultraviolet curing method. Therefore, the antistatic treatment of the protective film formed of such a structure can solve these problems by the ultraviolet curing composition and ultraviolet curing.

In the protective film according to the embodiment of FIG. 3, the antistatic and release layer 15 having the antistatic property and the releasability at the same time is formed on the surface of the base film 10 by using the conductive polymer as an active ingredient. In connection with this embodiment, the manufacturing method of "release agent composition and a release sheet" of Japanese Patent Laid-Open No. Hei 9-194806 has several disadvantages. In other words, the conductive material is a polyaniline conductive polymer, but the solubility is poor, so that a part of the aniline monomer is substituted to increase the solubility. However, the polyaniline has a disadvantage in that transparency and the dopant used in the present invention has a disadvantage that it leaks to the surface over time during use and contaminates the product. Therefore, in order to solve this problem, a conductive polymer having excellent transparency, non-transformation, and good resistance to solvents may be used. In this case, a poly 3,4-ethylene dioxy thiophene polymer having excellent transparency among the conductive polymers is used and the conductive polymer is used. When the UV cured by mixing with an ultraviolet curing binder, it is possible to produce a protective film having excellent visible light transmittance and no impurity transfer.

In the protective film according to the embodiment of FIG. 4, an antistatic layer 11 having conductive polymer as an active ingredient is formed on both sides of the base film 10, and a release layer 12 is formed on any one surface of the antistatic layer. Since both inside and outside of the protective film are electrostatically treated, the generation of static electricity is very low and the generated static electricity is effectively dissipated. However, since this structure also requires a process of treating the release agent on the upper surface after forming the conductive film, the conductive layer must not be damaged during processing of the release agent. It is preferable to introduce a UV curing method in which both curing methods can be used and the release agent is applied to the adhesive and the adhesive surface, and the resistance to the solvent is increased.

In the protective film according to the embodiment of FIG. 5, an antistatic layer 11 having a conductive polymer as an active ingredient is formed on one surface of the base film 10 and an antistatic property with the conductive polymer as an active ingredient at the other side thereof. The antistatic and release layer 15 having a release property is formed. The coating layer 15 of the protective film is a method of simultaneously adding a release agent and a conductive polymer to the antistatic performance. If the antistatic treatment is performed on both sides, the antistatic treatment is applied to the surface exposed to the outside during the first and fourth methods. Since there is an advantage that exhibits the property that the foreign material does not stick. In addition, the protective film according to the embodiment of FIG. 5 is preferably a release treatment by introducing an ultraviolet curing method rather than a method of mixing a conductive material and a release agent by using the thermosetting method of the Japanese Laid-Open Patent Publication. Cotton can be used for both thermosetting and UV curing methods.

The configuration of the protective film according to the present invention as described above will be described in detail.

The composition for coating the conductive polymer may be prepared including the conductive polymer and the binder, but preferably 0.05-10% by weight of the conductive polymer, 5-40% by weight of the polymer binder, and 50-94.95% by weight of the solvent which is a diluent. More preferably 1-5 parts by weight of thickener, 1-5 parts by weight of high boiling solvent, 1-5 parts by weight of dispersant, and 0.01-0.1 parts by weight of adhesive and lubricant based on 100 parts by weight of the solution. One or more may be included to prepare a mixture.

First, as the conductive material for the antistatic treatment, the aforementioned conductive polymer may be used. As the conductive polymer, polyaniline, polypyrrole and polythiophene and derivatives thereof may be used, and poly 3,4-ethylenedioxythiophene (PEDOT), which is Baytron manufactured by HC Starck, having excellent conductivity and transparency, is preferred. The use of is preferred. PEDOT is a polythiophene substituted with an ethylenedioxy group, and the band gap is lowered by a substituent, which has excellent transparency. In addition, since the anion used for the doping of the conductive polymer is polystyrenesulfonic acid having a high molecular weight and well-soluble in water, there is no fear of occurrence of monomer dopants and excellent stability.

However, the composition range is not intended to set the critical range of the absolute meaning, and the deviation in the appropriate range is of a degree that will be apparent to those skilled in the art without departing from the scope of the present invention.

In the case where the conductive polymer solution is applied alone during the coating treatment, it is necessary to add a binder together with this, since it may be a problem of being separated from the underlying polymer surface to be coated or dissolved in a solvent.

The binder usable in the present invention includes a water-soluble or solvent-type binder, and contains at least one functional group such as acrylic, urethane, epoxy, amide, imide, ester, carboxyl, hydroxyl group, silane, titanate, and silicate. Binder can be used alone or in combination of one or more.

The binders exemplified above are selected and added according to the properties of the solvent to be used. In this case, the addition amount may be different depending on the required resistance. In the present invention, when the required surface resistance range is 10 ⁴ -10 ¹⁰ Ω / □, it is preferable that the conductive polymer and the binder maintain a constant ratio when the binder is added.

In addition, when the binder contains a hardenable active ingredient, in order to reinforce the properties of the anti-fouling coating layer, melamine curing agent, epoxy curing agent and catalyst, weak organic acid curing agent such as paratoluenesulfonic acid, naphthalenesulfonic acid, toylene isocyanate, methylbisisocyanate, etc. Isocyanate curing agents and curing agents such as amines, organic weak acids, etc. can be used, depending on the type of curing reaction can be used. If more than one curing reaction can occur, it is possible to use more than one curing agent in a range where the reactivity is not reduced or abrupt. As mentioned above, when the binder is curable, a curing agent may be mixed and used. Even though no additional curing process is introduced, curing may proceed slowly due to heat generated at room temperature and inside while the liquid crystal display is being used. Therefore, when using an antistatic and anti-dust anti-hardening agent has a merit that the physical properties of the coating film can be gradually strengthened.

Dispersants to aid dispersibility when preparing a coating liquid containing a conductive polymer do not require special limitation, but are preferably, for example, 1-methyl-2-pyrrolidinone, 1-methyl-pyrrolidone, 2-methylpy Rollidone, 1-methyl-3-pyrrolididiol and the like can be used. The compound may also act as a curing agent during drying and curing, but it is also excellent in compatibility with the conductive polymer chain, thereby increasing the effective conductivity length of the conductive polymer may also play a role of enhancing conductivity.

Antioxidants may be used to inhibit thermal oxidation degradation, pentaerythryl-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) -propynate], octadecyl 3 -(3,5-di-tert-butyl-4-hydroxy phenyl) -propinate, triethylene glycol-bis-3 (3-tert-butyl-4-hydroxy-5-methylphenyl) propy Nate, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxy benzyl S-triazine-2,4,6- (1H3H5H) trione, thioethylene bis [3- ( Hindered phenols such as 3,5-di-tert-butyl-4-hydroxyphenyl) propane] and tris- (2,4-di-tert-butyl phenyl) phosphate, and the like. It is not limited to one kind.

In addition, high boiling point glycol and glycerol can be used for viscosity control and dispersion improvement. Ethylene glycol, diethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol diethyl ether, One or more of diethylene glycol diethyl ether, glycerol, and glycerol diglycidyl ether can be used.

Lubricants, antifoaming agents, leveling agents, etc. may be used to compensate for the improvement of wettability and spreadability during coating, and particularly, nonionic and ionic surfactants and silicone or fluorine-based surfactant compounds are preferred. Dow Corning, Shin-Etsu, Witco, 3M, etc. Lubricants and antifoaming agents manufactured and sold by these companies can be used when the total solution and usability are used, and the products are not limited to the above companies. Optional use is possible depending on the physical properties to be implemented.

The solvent for coating is to select an appropriate solvent according to the conductive polymer and binder to be used and can be used in accordance with the system of the solution used, such as water-soluble or organic solvent type. Examples of the solvent that can be used include distilled water depending on the coating liquid; Alcohols having 1 to 4 carbon atoms including methanol, ethanol, isopropanol and normal butanol; Toluene, xylene, acetone, methyl ethyl ketone, ethyl acetate and at least one solvent selected from the group consisting of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and ethylene glycol monobutyl ether are included in this. Preferably, the solvent has a specific gravity of high and low, and is compatible with the overall composition to select two or more kinds and may be used by including 50-94.95% by weight based on the total coating composition.

In addition, poly 3,4-ethylenedioxythiophene polymer can be directly synthesized and used. For example, conductive polymer monomers such as 3,4-ethylenedioxythiophene, aniline, pyrrole and thiophene can be used such as ferrictoluenesulfonic acid and ferric chloride. The conductive film may be formed by mixing with an oxidizing agent, directly coating and then polymerizing and washing or using gas phase polymerization or solution-based polymerization. However, since all of these methods are directly polymerized, a process of washing unreacted materials after polymerization is required, and there is a disadvantage that contamination may occur due to remaining unreacted materials and ions.

In addition, after forming the conductive polymer layer as described above for the antistatic treatment on the backlight protection film, ultraviolet curing is used in addition to the thermosetting method to prevent damage to the conductive polymer layer and to increase durability of the exposed surface when the release agent is treated. To form an antistatic layer.

The UV curable composition comprises 0.05-20% by weight conductive polymer, 10-50% by weight UV curable oligomer and monomer, 0.5-5% by weight photoinitiator, 25-89.45% by weight solvent. If necessary, based on 100 parts by weight of the composition, 0.1-5 parts by weight of the surfactant, and / or 0.1-2 parts by weight of the UV stabilizer may be further mixed with the composition.

The ultraviolet curable polymer oligomer is preferably used alone or in combination of two or more polyfunctional acrylates / methacrylates having a monofunctional or 2-12 functional group having functional groups such as epoxy and urethane. Monomers can be used with monofunctional / polyfunctional acrylate / methacrylate monomers, and it is better to use polyfunctional groups, and if only monomers are used, the brittleness can be too brittle. A high surface layer can be formed.

Photoinitiators to initiate curing may be liquid or solid photoinitiators. Typical photoinitiators include benzyl dimethyl ketal, hydroxy cyclohexyl phenyl ketone, hydroxydimethyl acetophenone, benzophenone, 2,4,6-trimethylbezoyl. Diphenyl phosphine or the like can be used by mixing at least one. In the case of ultraviolet curing, when the conductive polymer is exposed to ultraviolet rays, the conjugated double bond may be broken and the conductivity may be lowered. Thus, 2,4 dihydroxybenzophenone and 2-hydroxy4-n- One or more kinds of ultraviolet stabilizers such as octoxybenzophenone and ethyl-2-cyano-3-3-diphenyl acrylate may be used alone or in combination. The photoinitiator, UV stabilizer, absorbent, and the like are not limited to the types mentioned above, and may be selectively used depending on the type of oligomer and monomer used in UV curing, the wavelength of the curing apparatus, and the like depending on the use and the physical properties to be implemented. It is not possible to limit the type because it can be used selectively. Additives and solvents such as thickeners and lubricants used in the UV-curable composition may be used for all the same kind mentioned in the thermosetting method for the same purpose.

Release agents used in the present invention can be used both vinyl, copolymers containing alkyl groups, carboxyl groups, hydroxyl groups, and silicone type release agents commonly used and florin type release agents containing florin. However, preferably among the most commonly used silicone types, particularly when removing the protective film is too easy or too difficult to fall off, that is, the peel strength is preferably adjusted, this specification controls the degree of release agent according to the user's needs Selective use is possible. It is also a good idea to use a release agent with a small degree of transition, such as a curing method to prevent the release agent from transferring to the adhesive during use. For example, when a polydimethylsiloxane or a modified polydimethylsiloxane compound containing a hydroxyl group is mixed with various isocyanates to proceed with curing, the release treatment is excellent due to excellent release properties and less transferability.

In the present invention, when a mixture of the release agent and the conductive polymer is used, the coating may be performed by mixing the poly3,4-ethylenedioxythiophene and the release agent having excellent usability. The compatibility and mixing ratio of the two are very important. Since the antistatic performance and the release property should be implemented at the same time, if any one component is mixed, the antistatic performance is excellent but the releasability is lowered. On the contrary, if the releasability is added well, the antistatic performance may be degraded. In the present invention, since various kinds of release agents can be used, the ratio can be adjusted according to the conditions used, but it is preferable to mix 0.1 to 10 parts by weight of the release agent with respect to 100 parts by weight of the conductive polymer.

In the present invention, the base film of the transparent protective film for protecting an object such as a backlight is a biaxially stretched polyester film, such as polyethylene terephthalate, polyethylene naphthalate, biaxially stretched polypropylene film, nylon series film of polyamide, etc. Can be used In addition, it is possible to use all films having excellent transparency and hardness, but it is advantageous to use a biaxially stretched polyester film for use in the protective film for liquid crystal display in terms of transparency and mechanical properties.

In addition, the antistatic release treatment of the present invention is a technology that can be applied to all kinds of fabric to protect the adhesive and can be used in various plastic films and papers, non-woven fabrics.

In more detail, in forming the antistatic layer on the base film to be used for the protective film such as backlight, the wettability or adhesion of the coating liquid may be lowered due to the difference in surface physical properties such as the surface tension of the polymer used on the surface of the protective film. In order to compensate for this, the base fabric surface is corona treated to have a surface tension of at least 35 dynes / square centimeter or more, so that wetting and adhesion can be improved at the same time. It is also possible to form a permanent antistatic layer thereon after first applying a primer having good compatibility with the binder component used as a permanent antistatic layer material coated on the surface of the base fabric. At this time, the material that can be used as a primer may be used alone or two or more functional groups such as urethane, acrylic, epoxy, amide, imide, hydroxyl group, carboxyl group, siloxane, or modified from these functional groups Can be.

The same method can be used for release treatment with an antistatic layer containing a conductive polymer as an active ingredient and a release agent on a base film to be used as a protective film. A roll coater, a gravure coater, a micro gravure coater, an oblique gravure coater, a bar coater, a lip A coater or the like can be used. In addition, the release agent and the conductive polymer solution may be spray-coated, but there is a disadvantage in that there is a loss of the solution, but it can be used by adding a dust collector. These coating and drying processes can be carried out in a thermocycle of 50 to 100 degrees in the case of thermosetting or in a few seconds to several minutes in an air and infrared dryer.

In addition, when UV curing is used, the light source can be selected and used according to the type of initiator. Fusion type H and D lamps, which are added with both long and short wavelengths, can be used, and general mercury lamps and metal halides can also be used. It is possible. In this case, when preparing an ultraviolet curing composition, a composition such as an initiator may be selected and used according to an ultraviolet curing method.

In addition, the antistatic treatment using a conductive polymer and the coating of the release agent is preferably treated to a thickness of 0.05 ~ 2 microns. If the thickness is thicker than 2 microns, there is a disadvantage in that the permeability falls depending on the thickness of the antistatic layer, and in the case of the release agent, if the thickness is thick, there is a risk of leaving the protective film. In addition, when the coating is thinner than 0.05 microns, it is difficult to implement properties such as antistatic and release property.

After the coating process is finished, to increase the adhesion between the release agent and the antistatic layer on the base protective film, pressurize the release agent layer by applying pressure or by additional curing at a temperature between 25 and 60 degrees, the durability of the antistatic layer is increased. If it improves, the hardening degree of a mold release agent can also be expected to increase.

In addition, in case of backlight, after the adhesive is attached to the protective film, the adhesive film is attached to the release surface and the other side is untreated film. Antistatic treatment on the opposite side of the film release process can reduce the generation of static electricity or effectively dissipate the generated static electricity when the films overlap with each other when transporting, and when the protective film with adhesive is used, Since the surface is electrostatically treated, it becomes a method of transporting and using the backlight protection film that is structurally well electrostatically treated.

The antistatic treatment and the release treatment of the release film having the adhesive with the protective film are possible to the same static and release treatment as the protective film, and the protective film must protect the backlight and not sag toward the backlight, so that the thickness is not limited to a certain thickness. It is preferable to use, but the release film for supporting the protective film can be used 20 ~ 60 microns.

Hereinafter, the present invention will be described in detail with reference to examples, but the following examples are merely illustrative for describing the present invention and do not limit the scope of the present invention.

Comparative Example 1

Measurement of generated electrostatic voltage: 3M 718A STATIC is used to remove the static electricity generated when an operator using a finger coat removes the backlight protection film for an antistatic liquid crystal display, which is being used, at a speed of 10 mm / minute from the backlight at an angle of 180 degrees. Measurement was made using SENSOR. The static electricity generated at this time was 790V.

Foreign body adsorption experiment: Also, the separated backlit protective film was approached by a distance of 10mm to the foreign material mixed in the size of 0.3 micron ~ 1mm generated by the backlight and the liquid crystal display panel at a distance of 10mm. As a result of measuring the total number of adsorbed foreign substances, it was observed that 895 foreign substances stuck together.

Surface resistance and decay time measurement: In addition, the surface resistance was measured by insulation of more than 10 ¹² ohms / area with the conventional anti-static backlit protective film measured with SRM110. Decay time when the voltage was reduced to 100V by applying 1000V was observed that the static electricity applied for 300 seconds or more did not disappear.

<Example 1>

Preparation of antistatic liquid: Poly (3,4-ethylenedioxythiophene) dispersion (Baytron PH, HC Starck, Germany) 10g, urethane binder 20g (U710, ALBERDINGK, Germany), ethylene glycol 1g, N-methyl2-pyrrolidinone 1 g and 0.01 g of florin-based lubricant were mixed with 67.99 g of a water: isopropyl alcohol (15:85) mixed solvent to prepare an antistatic coating solution.

Preparation of Release Treating Agent: A solution was prepared in which 5 g of hydroxy polymodified siloxane and 0.15 g of a curing agent having three isocyanate groups were mixed with 30 g of acetone.

The coating solution prepared as described above was first coated with an antistatic coating solution to be 0.1 micron on one surface of a 100 micron biaxially stretched polyethylene terephthalate film used as a protective film for a liquid crystal display, and then dried at 80 degrees for 2 minutes. And the opposite side was coated with a release agent prepared as described above to a thickness of 0.1 micron and dried at 70 degrees for 2 minutes.

The surface resistance of the antistatic treated surface prepared as above was observed at 10 ⁶ ohms / area.

The film thus prepared was cut to fit the 2-inch backlight and then double-sided adhesive was attached to the release film and then peeled off the release paper with the protective film attached to the prepared backlight to fix the adhesive to the backlight.

The static electricity generation, the measurement of foreign matters and the decay time were used in the same manner as in Comparative Example 1.

In the anti-correction protection film prepared in Example 1, the static electricity generated when removing the protective film from the backlight unit was 98V, the adhered foreign matter was 0.2 micron size 1, the decay time was observed to 0.1 seconds.

The antistatic backlight protection film produced as described above was subjected to antistatic treatment on one side of the protective film and release treatment on the opposite side, but the voltage generated by dropping from the adhesive on the release side was effectively attenuated on the antistatic treatment side. Was observed. This protective film can be used as a backlight protection film that has less static electricity to be used in the liquid crystal display and prevents foreign matter adhesion.

<Example 2>

Preparation of UV Curing Antistatic Coating Solution: 5 g of poly (3,4-ethylenedioxythiophene) dispersion (Baytron PH, Bayer Co.) and 5 g of 6-functional urethane acrylate oligomer, 5 g of tri-functional urethane acrylate monomer, methylbenzoylformate 0.3 g was mixed with 20 g of isopropyl alcohol and 20 g of ethylene glycol monomer ethyl ether to prepare an antistatic ultraviolet curing agent.

The antistatic agent was coated to 0.2 micron on one surface of a 100 micron biaxially stretched polyethylene terephthalate film used as a protective film for a liquid crystal display, dried at 60 degrees for 2 minutes, and then applied 800 mJ using a metal light lamp. Cured. And the opposite side was coated with a release agent prepared as described above to a thickness of 0.1 micron and dried at 70 degrees for 2 minutes.

The surface resistance of the antistatic treated surface prepared as above was observed at 10 ⁶ ohms / area.

In addition, the static electricity of the protective film was generated 85V, the number of stuck foreign matter was 0 and the decay time was observed as 0.1 seconds.

When the antistatic treatment by UV curing method as described above, not only the static electricity is generated, but also the protective film which is not attached to foreign substances can be manufactured, and the durability due to friction during use increases, and the occurrence of scratches in the process of attaching the adhesive This may exhibit fewer features.

Comparative Example 2

Comparative Example 2 relates to a method of coating a release agent on the antistatic treatment surface of Example 1, that is, to a method of treating the release agent after the antistatic treatment by a thermosetting method on one surface of the protective film.

First, the release agent used in Example 1 was coated on one side of the thermosetting antistatic treatment of Example 1.

At this time, the surface resistance was 10 ⁷ ohms / area and the static electricity was 69V. When removing the protective film from the backlight unit, the number of stuck foreign matters was 0 and the decay time was 0.1 seconds.

However, when the surface coated with antistatic treatment and release treatment on the surface twice and visually observed under a microscope, a foreign substance generated from the antistatic treatment surface caused by scratching by a plurality of scratches and a solvent of the release agent was found.

Therefore, when re-coating the release agent, it was thought that it would be a good way to add the durability of the anti-static treatment surface to impart properties that do not change against contact or attack of the solvent.

<Example 3>

In order to solve the problem of Example 2, Example 3 relates to a method of treating the release agent immediately after the antistatic treatment on one surface of the protective film, in which case forming an ultraviolet cured antistatic layer rather than a coating by thermal curing It is desirable to.

5 g of poly (3,4-ethylenedioxythiophene) dispersion (Baytron PH, Bayer), 5 g of 6-functional urethane acrylate oligomer, 5 g of tri-functional urethane acrylate monomer, 0.3 g of methylbenzoylformate, 20 g of isopropyl alcohol and ethylene The antistatic ultraviolet curing agent was prepared by mixing with 20 g glycol glycol ethyl ether.

The antistatic agent was coated to 0.2 micron on one surface of a 100 micron biaxially stretched polyethylene terephthalate film used as a protective film for a liquid crystal display, dried at 60 degrees for 2 minutes, and then applied 800 mJ using a metal light lamp. Cured. And the upper surface was coated with a release agent used in Example 1 to a thickness of 0.1 micron and dried at 70 degrees for 2 minutes.

The surface resistance of the prepared electrostatic treated surface was 10 ⁷ ohms / area, and static electricity was generated at 69V. When the protective film was removed from the backlight unit, the number of stuck foreign substances was 0 and the decay time was 0.1 seconds. .

<Example 4>

Example 4 relates to a method for performing a double-sided electrostatic treatment, wherein one side of the electrostatic treatment relates to a double-sided electrostatic treatment for coating a thermosetting conductive polymer solution and a surface for re-coating a release agent for ultraviolet curing.

First, the thermosetting type antistatic conductive polymer solution as in Example 1 was coated, and then the UV curable antistatic agent prepared in Example 2 was coated on the opposite side. And the release agent used in Example 1 was recoated on the ultraviolet-ray-treated electrostatic treatment surface.

In the protective film prepared as described above, the surface resistance of the antistatic treatment surface using the thermosetting method was 10 ⁶ ohms / area and the surface resistance of the release treated surface after the ultraviolet curing antistatic treatment was 10 ⁷ ohms / area and the backlight was observed. When the protective film was removed from the unit, static electricity was generated at 15V, the number of stuck foreign materials was 0, and the decay time was 0.1 seconds.

Example 4 relates to a method of antistatic treatment on both sides, it was found that the static electricity generated compared to the method of coating on one side.

Example 5

Example 5 relates to a method of antistatic treatment on one side of the backlight protection film and the antistatic and release treatment on the opposite side at the same time. It relates to a method of mixing and coating a release agent.

First, poly (3,4-ethylenedioxythiophene) dispersion (Baytron PH, HC Starck, Germany) 10g, urethane binder 20g (U710, ALBERDINGK, Germany), 1g ethylene glycol, 1g N-methyl2-pyrrolidinone, florin-based lubricant A solution obtained by mixing 0.01 g with 67.99 g of a water: isopropyl alcohol (15:85) mixed solvent was coated on one surface of a 100 micron biaxially stretched polyethylene terephthalate film and dried at 80 ° C. for 2 minutes.

Preparation of UV curing antistatic and release coating solution: 5 g of poly (3,4-ethylenedioxythiophene) dispersion (Baytron PH, Bayer) and 5 g of 6-functional urethane acrylate oligomer, 5 g of tri-functional urethane acrylate monomer, methylbenzoylform 1 g of hydroxypolymodified siloxane releasing agent and 10 g of acetone were mixed in a solution obtained by mixing 0.3 g of mate with 20 g of isopropyl alcohol and 20 g of ethylene glycol monomer ethyl ether.

The UV cured antistatic releasing solution thus prepared was coated to 0.2 micron on the opposite side, and dried at 70 ° C. for 2 minutes, and then cured by applying 800mJ using a metal harlight lamp.

In the protective film prepared as described above, the surface resistance of the antistatic treatment surface using the thermosetting method was 10 ⁶ ohms / area and the surface resistance of the surface subjected to UV curing antistatic and release treatment simultaneously was 10 ⁷ ohms / area. When the protection film was removed from the backlight unit, 8V of static electricity was generated, the number of stuck foreign materials was 0, and the decay time was 0.1 seconds.

<Example 6>

Example 6 is to perform the antistatic treatment on both sides of the protective film, as in the method of Example 5, the antistatic treatment using the ultraviolet curing method on one side and the thermosetting antistatic agent and release treatment on the opposite side at once It is about a method.

First, 5 g of poly (3,4-ethylenedioxythiophene) dispersion (Baytron PH, Bayer), 5 g of 6-functional urethane acrylate oligomer, 5 g of tri-functional urethane acrylate monomer, 0.3 g of methylbenzoylformate, 20 g of isopropyl alcohol, and After mixing with 20 g of ethylene glycol monethyl ether to prepare an anti-static UV curing agent, coated 100 micron biaxially stretched polyethylene terephthalate film on one side to 0.2 micron and dried at 60 degrees for 2 minutes and then using metallight lamp 800mJ was applied to cure.

Preparation of thermosetting antistatic and release coating liquids: Poly (3,4-ethylenedioxythiophene) dispersion (Baytron PH, HC Starck, Germany) 10g, urethane binder 20g (U710, ALBERDINGK, Germany), ethylene glycol 1g, N-methyl2 1 g of hydroxypolymodified siloxane releasing agent and 15 g of acetone were added to a solution containing 1 g of pyrrolidinone, 0.01 g of florin-based lubricant, 30 g of isopropyl alcohol, and 20 g of ethylene monoethyl ether.

The thermal curing antistatic releasing solution thus prepared was coated to 0.2 micron on the opposite surface prepared before, and dried at 80 degrees for 2 minutes.

In the protective film prepared as described above, the surface resistance of the antistatic treated surface using the ultraviolet curing method was 10 ⁶ ohms / area and the surface resistance of the surface simultaneously subjected to the thermosetting antistatic and release treatment was observed at 10 ⁷ ohms / area. When the protection film was removed from the backlight unit, static electricity was generated at 9V, the number of stuck foreign substances was 0, and the decay time was 0.1 seconds.

According to the present invention, the anti-static backlit protective film has little static electricity when detached from the adhesive and is grounded through the detacher due to the structure of the film even when static electricity is generated. In addition, the most important foreign matters in the manufacturing of the liquid crystal display does not adhere to the high transmittance of the visible light can be produced a protective film.

Claims (10)

Transparent base film 10; A transparent antistatic layer 11 formed on one side or both sides of the base film, the conductive polymer being an active ingredient; And A release layer 12 formed on one surface of the base film 10 or the antistatic layer 11; Including, easy to stick and remove, a protective film having a transparent antistatic and foreign matter prevention function. The method of claim 1, wherein when the release layer 12 is formed on one surface of the antistatic layer 11, the antistatic layer 11 is formed by an ultraviolet curing method. Protective film having a. The method of claim 1, When the release layer 12 is formed on one surface of the antistatic layer 11, the antistatic layer 11 and the release layer 12 are combined into one layer to form a single antistatic and release layer 15. And The antistatic and release layer 15 is a conductive polymer, and poly 3,4-ethylene dioxy thiophene polymer and a release agent having good usability with the conductive polymer are mixed with an ultraviolet curing binder and UV cured to provide excellent visible light transmittance and impurities. Transparent antistatic and foreign matter protection film, characterized in that there is no transition. The protective film of claim 1, wherein the antistatic layer 11 is formed by coating the conductive polymer as an active ingredient by a coating method by UV curing or thermosetting. The base film 10 according to any one of claims 1 to 4, characterized in that any one of a biaxially stretched polyester film, a biaxially stretched polypropylene film, a nylon series film of polyamide is used. Protective film with transparent antistatic and foreign matter prevention function. The antistatic layer (11), the release layer (12), or the antistatic layer (11) and the release layer (12) have a thickness of 0.05 to 2 microns. A protective film having a transparent antistatic and foreign matter prevention function, characterized in that it has. The composition according to any one of claims 1 to 4, wherein the antistatic layer 11 comprises 0.05-10% by weight of a conductive polymer, 5-40% by weight of a polymeric binder, and 50-94.95% by weight of a solvent which is a diluent. Transparent antistatic and foreign matter protection film, characterized in that formed by coating the. The method according to claim 7, wherein based on 100 parts by weight of the composition, 1-5 parts by weight of thickener, 1-5 parts by weight of high boiling point solvent, 1-5 parts by weight of dispersant, and 0.01-0.1 parts by weight of adhesive and lubricant. Transparent antistatic and foreign matter protection film characterized in that it comprises one or more. The method according to any one of claims 1 to 4, wherein when the antistatic layer 11 is formed using an ultraviolet curing method, the antistatic layer 11 is 0.05-20% by weight of a conductive polymer, an ultraviolet curable oligomer or A protective film having a transparent antistatic and foreign substance function, which is formed by coating an ultraviolet curable composition comprising 10-50 wt% of a monomer, 0.5-5 wt% of a photoinitiator, and 25-89.45 wt% of a solvent. The method according to any one of claims 1 to 4, wherein the surface of the base film 10 is corona treated to have a surface tension of at least 35 dynes / square centimeter or more, thereby simultaneously improving wettability and adhesion. A protective film having a transparent antistatic and foreign matter prevention function.

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