KR100789239B1 - A film for protecting a surface for a optical component - Google Patents

Abstract

The present invention provides a surface protection film for an optical member having an antistatic antifouling layer formed on an upper portion of the base film, wherein the antistatic antifouling layer is formed of a conductive polymer, a binder resin having a fluorinated hydrocarbon group, and an optical member. It provides a surface protection film.

The surface protection film according to the present invention has excellent antistatic properties and side chains without the humidity dependence of the conductive polymer, and is effective in improving pollution prevention, water resistance, abrasion resistance, etc. due to the fouling and water repellent properties of the binder resin in which the fluorinated hydrocarbon group is chemically bonded. There is. On the other hand, it is easy to handle by improving the protective function of the polarizing plate has the effect of lowering the defective rate that can occur in the manufacturing and distribution process.

Surface protection film, base film, antistatic antifouling layer, binder resin, conductive polymer, fluorinated hydrocarbon group

Description

A film for protecting a surface for a optical component

1 is a cross-sectional view of the surface protection film formed with an antistatic antifouling layer on the surface.

2 is a schematic cross-sectional view of a protective film according to the prior art.

Explanation of symbols on the main parts of the drawings

L1: antistatic antifouling layer L2: antifouling layer

L3: antistatic layer F1: base film

F2: Release Film A: Adhesive Layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent adhesive protective film applied to an optical film applied to a liquid crystal display, particularly an optical film such as a polarizing film and a retardation film, and a method of manufacturing the same. It relates to a transparent adhesive protective film having a stain-resistant, water-repellent properties and a method of manufacturing the same.

Liquid crystal displays used in various applications are used with various optical films to realize their characteristics, and since the liquid crystal display products are treated as defects even in the minute damage and defects of such optical films, they may cause contamination during manufacturing or distribution. And in order to prevent damage, the adhesive film for surface protection is attached to the surface of an optical film, and is strictly controlled in a manufacturing process and a distribution process.

In addition, since the image inspection is performed while the protective film is attached in the manufacturing process of the LCD module, the damage or the defect of the protective film itself may cause an obstacle of the optical film or the entire product.

For the same reason, a pressure-sensitive adhesive film for protecting the surface of an optical film also requires various physical properties to prevent strict quality of foreign matter and defects at the optical film level and to prevent poor productivity in the manufacturing process.

As a function of the surface protection film of the optical film (such as a polarizing film or a retardation film) as described above, it is necessary to be resistant to external impact and scratches in the process of attaching the protective film to the optical member, distribution, and LCD manufacturing process. .

In addition, when the film is released in the rolled state or in the attaching process, static electricity due to friction is generated. At this time, the static electricity generated when there is no antistatic performance on the surface may attract dust from outside, causing contamination by foreign matter adhesion, and may also cause defects in the alignment of the liquid crystal and IC circuit in the LCD module assembly process. To prevent this problem, antistatic performance of less than 10 ¹⁰ Ω / area (Ω / Sq) is required.

In addition, polarizing film is cut to each required size and supplied to LCD companies. At this time, the polarizing film is cut in accordance with the size of the loaded state. At this time, the pressure-sensitive adhesive cut out from the cutting surface of the polarizing film should not be easily buried on the surface of the protective film.

On the contrary, the protective film is automatically peeled off using a pick-up tape for peeling off the protective film in order to increase the size of the LCD and improve productivity during the manufacturing process of the LCD panel. At this time, for the automatic peeling of the protective film, an acrylic or rubber peeling tape is used. At this time, if the adhesive force between the surface of the protective film and the peeling tape is too low, the protective film will not be peeled off, causing a process defect so that the peeling of the protective film is over a certain level. Adhesion with the tape is required.

In addition, in order to remove the contamination of the surface in the polarizer manufacturing process and LCD assembly process, it has a process of removing the contamination by washing with water, such as alcohol and water, resistant to the organic solvent used for cleaning and used Water resistance and resistance to cleaning solvents and solvents that must be easily removed are required.

In addition, in recent years, other optical films, including optical films such as polarizing plates, have various types of products according to their use, and there is an increasing demand for information recording to improve production management and ease of use. Printing aptitude for (Stamp) or the like is required.

In manufacturing a protective film for an optical film in the prior art, various manufacturing methods have been proposed as various functions are required.

In Figure 2 is provided with an antistatic layer (L3) and an antifouling layer (L2) in a separate form on the base film (F1), the surface protection film of the prior art consisting of a pressure-sensitive adhesive layer (A) and a release film (F2) below A cross-sectional view of the attached optical film is shown.

In the conventional manufacturing process of the protective film, it is difficult to manufacture a protective film having both antistatic properties and stain resistance at the same time, and is primarily provided with an antistatic layer composed of a mixture of a surfactant, a metal oxide, a conductive polymer, and an organic binder. In addition, a method of having an antifouling layer having stain resistance, abrasion resistance, and printability has been proposed.

However, the above method is not advantageous in terms of cost reduction of the LCD. That is, in the conventional method as described above, after the antistatic layer coating process, the additional process of the antifouling layer coating process is required, thereby increasing the process cost. In addition, after the first antistatic layer coating is subjected to the step of winding with a roll, wherein the antistatic component contained in the antistatic layer or components of various additives for the coating is rolled to the opposite side of the film when winding in the roll state, When the pressure-sensitive adhesive coating, there is a disadvantage that causes a defect such as non-uniformity of the pressure-sensitive adhesive coating and adhesion to the substrate.

On the other hand, a method of forming a single layer by mixing the surfactant type antistatic agent with an organic binder having a fouling resistance function has been proposed. However, this method can reduce the manufacturing cost by simplifying the coating process, but it is difficult to realize the water repellent performance due to the hydrophilic properties of the antistatic agent component, and the stable dependence of the antistatic performance due to the humidity dependence of the antistatic performance is difficult. do. In addition, the antistatic component migrates to the surface to form a thin film, which lowers the resistance to solvents such as alcohol, and when the organic solvent is washed, the antistatic performance is lost, and the antistatic agent transferred to the surface contaminates the optical film. It has the disadvantage of making it happen.

In order to solve the problems caused by the use of the surfactant type antistatic agent, a protective film having an antistatic layer in which a conductive polymer, which is a conductive impartant without external transition, is mixed with an organic binder has been proposed.

However, the conductive polymer added to realize the antistatic performance has a strong hydrophilic property is difficult to implement the water repellent properties, the conductive polymer is dispersed in a solvent such as water, the organic binder used at this time to use a water-soluble resin and a water-dispersible resin Wherein emulsifiers and surfactants are used. In this case, even if a small amount of emulsifier is used, the film is transferred to the surface after the final coating to form a thin film in nanometers, and thus it is difficult to implement pollution resistance due to the increase of surface energy. At this time, the surfactant layer formed on the surface is processed and In use, it has the disadvantage of acting as an impurity.

The conductive polymer alone is not capable of achieving adhesion and sufficient coating film strength to the base film and thus requires a binder component in the form of an organic polymer.

As the binder resin, acrylic resins, urethane resins, polyesters or polyamides may be used, and two or more kinds of mixed resins may be used. However, the binder resins listed above are excellent in toughness, abrasion resistance, flexibility, and adhesion to the substrate, and also, the binder resins as listed above alone are difficult to realize fouling resistance and water repellent performance.

Surface properties such as water repellency and fouling resistance on organic solid surfaces made of polymers, such as surface protective films, are related to the surface chemical structure and molecular arrangement of the polymers. By modifying the surface properties, performances such as water repellency and fouling resistance can be added.

As such, there is a method of realizing fouling resistance and water repellency by mixing a silicon or fluorine compound with a binder resin as an additive, but since the added silicon and fluorine components are not chemically bonded to the polymer resin, they are transferred to the surface. Problems such as desorption may occur, which is undesirable because it may act as an impurity.

In order to solve the problems in the prior art as described above, in the present invention, it is possible to implement an excellent antistatic property without a dependency on humidity, excellent pollution resistance, water resistance, solvent resistance, printability and can reduce the manufacturing cost An object of the present invention is to provide a protective film and a manufacturing method.

In order to achieve the above object, in the present invention, an antistatic antifouling layer having an antistatic antifouling layer formed on the base film, wherein the antistatic antifouling layer has a fluorinated hydrocarbon group side chain in the conductive polymer and the polymer main chain It provides a surface protective film for an optical member comprising a binder resin.

According to one embodiment of the invention, the antistatic antifouling layer provides a surface protection film for an optical member, characterized in that 100 parts by weight of the binder resin and 1 to 10 parts by weight of the conductive polymer.

According to another embodiment of the present invention, the polymer backbone provides a surface protection film for an optical member, characterized in that at least one copolymer mixture selected from the group consisting of acrylic resins, urethane resins and polyesters.

According to another embodiment of the present invention, the binder resin having a fluorinated hydrocarbon group side chain provides a surface protection film for an optical member, characterized in that it has a fluorinated hydrocarbon group of 1 to 50% by weight.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The surface protection film for an optical member according to the present invention is provided with an antistatic antifouling layer made of a conductive polymer, a binder resin having a fluorinated hydrocarbon group side chain, and a hardener, and thus, antistatic, fouling resistance, water repellency, automatic peeling, printing It is characterized by improved aptitude and wear resistance and reduced manufacturing costs.

More specifically, the present invention provides a surface protection film for an optical member having an antistatic antifouling layer formed on an upper portion of a base film, wherein the antistatic antifouling layer is formed of a conductive resin and a binder resin having a fluorinated hydrocarbon group side chain in a polymer main chain. It is characterized by.

The conductive polymer imparts antistatic performance to the surface protective film by the electrically conductive properties of the conductive polymer. If the surface protection film lacks an antistatic function, static electricity of high voltage is generated by friction during processing and transportation, and at this time, the static electricity is strongly attracted by the generated static electricity to cause stigma such as foreign substances. In addition, it also prevents damage to the LCD module circuit and liquid crystal alignment caused by static electricity generated when the protective film is peeled off in the final LCD module process.

As the conductive polymer used in the present invention, polyacetylene, polyaniline, polypyrrole, or polythiophene can be used.

The conductive polymer recently developed by Bayer has a low bandgap (1.6 to 1.7 eV) and has high transparency. Recently, polystyrene sulfonate (PSS) is used as the dopant and EDOT (ethylenedioxythiophene) is used. : ethylenedioxythiopen) was polymerized in an aqueous solution to prepare PEDOT (3.4 polyethyldioxythiopen) in the form of an aqueous solution to improve transparency, electrical conductivity, thermal stability, processability, and dispersibility, which were dispersed in a solvent such as water. As supplied under the product name of Baytron (P, PH, PAG), it is suitable for use as the conductive polymer in the present invention.

In the present invention, a binder resin having a fluorinated hydrocarbon group side chain in the polymer main chain is used. The polymer forming the main chain of the binder resin may be an acrylic resin, urethane resin, polyester or polyamide.

The binder resin is a form in which a fluorinated hydrocarbon group is introduced as a side chain into a polymer main chain such as an acrylic resin, a urethane resin, a polyester or a polyamide, and may be generated when a fluorinated hydrocarbon is used in an additive form as in the prior art. The problem can be solved.

The binder resin having a fluorinated hydrocarbon group side chain has high surface orientation because the fluorinated hydrocarbon group is incompatible with the base film. The fluorine atom has a low surface energy, and thus has a chemically stable property, thereby imparting properties such as a non-tacky water repellent function. Thus, the surface of the antistatic antifouling layer comprising the binder resin having the fluorinated hydrocarbon group side chain has high thermal, chemical stability and resistance to chemicals due to the above-described characteristics of the fluorine atom, and also surface-oriented fluorine. Since it has contamination resistance, low friction, water repellency, antifouling performance, etc. due to low surface energy characteristics by atoms, it has suitable properties as a binder for coating the optical protective film of the present invention.

The fluorinated hydrocarbon group is preferably CF ₃ (CF ₂ ) n (wherein, an integer of n = 3 to 7).

Urethane resin having a fluorinated hydrocarbon group side chain according to an embodiment of the present invention, by reacting the fluorinated monohydric alcohol with trifunctional isocyanate to prepare a fluorine-containing diisocyanate, which is used in the synthesis of known urethane resin Obtained by reaction with polyols.

Acrylic resin having a fluorinated hydrocarbon group side chain according to another embodiment of the present invention is prepared by a known polymer polymerization method such as radical polymerization method, the acrylic resin is methacrylic acrylic acid, methyl methacrylate, which is an unsaturated hydrocarbon compound, Polymers such as ethyl acrylate or butyl methacrylate.

The content of the fluorinated hydrocarbon group in the binder resin having the fluorinated hydrocarbon group side chain used in the present invention is preferably 1 to 50% by weight. When the content of the fluorinated hydrocarbon group is less than 1% by weight, the implementation of non-tacky and water-repellent properties, which is a function accompanied by low surface energy based on the fluoroalkyl group, is insufficient, and when it exceeds 50% by weight, a binder resin such as urethane resin There is a problem in that degradation of wear resistance, mechanical strength, and the like, which are inherent characteristics of a synthetic resin, which is a main chain thereof, occurs.

In the antistatic antifouling layer according to the present invention, the content of the conductive polymer is preferably 1 to 10 parts by weight based on 100 parts by weight of the binder resin. When the content of the conductive polymer is less than 1 part by weight, there is a disadvantage in that the antistatic property is reduced and foreign matters adhere to the static electricity. When the content of the conductive polymer is more than 10 parts by weight, the amount of the expensive conductive polymer is increased, which is economically undesirable. A decrease in transmittance occurs.

For example, in the protective film for a polarizing plate, since the inspection is performed through the polarizing plate cross nicol after being attached to the polarizing plate, strict quality for coating stains, etc. is required, and in consideration of the accuracy of the current coating equipment, 0.3 to 3.0 based on solid content The preparation of a coating liquid comprising a conductive polymer in a weight percent content is preferred when considering the appearance of the coating.

According to another embodiment of the present invention, the antistatic antifouling layer may further include a curing agent. The curing agent binds to the reactive group in the binder resin and crosslinks the binder resin to increase resistance and strength to the solvent, and may be aziridine, isocyanate-soluble melamine, or carbodiimide. The content of the curing agent is 1 to 10 parts by weight based on 100 parts by weight of the conductive polymer in the antistatic antifouling layer. If the content of the curing agent is less than 1 part by weight, it is impossible to implement sufficient resistance to the solvent. If the content of the curing agent exceeds 10 parts by weight, the uncured component may remain, causing problems such as transfer.

The antistatic antifouling layer of the present invention is prepared from a coating liquid consisting of a conductive polymer, a binder resin having a fluorinated hydrocarbon group side chain, a curing agent and a solvent. At this time, as the solvent, it is possible to use an organic solvent such as water or ethyl alcohol, methyl alcohol, isopropyl alcohol, butyl alcohol or pyrrolidone, and it is preferable to use two or more kinds in consideration of drying and leveling properties.

The antistatic antifouling layer according to the present invention may be prepared by coating the coating solution through a method such as gravure, roll coating, or mayer bar, which is a general coating method, followed by heat drying and curing.

The method of curing the antistatic antifouling layer according to the present invention can be used both thermal curing and UV curing. In addition, a two-component curing method using a mixture of water-soluble isocyanate, melamine, aziridine, oxazoline, and metal oxide is possible to increase the resistance to the solvent.

In addition, the thickness of the antistatic antifouling layer is preferably 0.02 to 1.0 μm, and more preferably 0.03 to 0.3 μm on the basis of the thickness after coating drying. If the thickness of the coating layer is less than 0.02 μm, it is difficult to secure sufficient film strength, and thus it is difficult to secure solvent resistance and abrasion resistance. In the protective film image inspection, the reflection of the blue wavelength in the visible light region is relatively increased due to the disappearance interference of the light, which causes disadvantages of the image inspection.

In the surface protection film for an optical member according to the present invention, the contact angle of the antistatic antifouling layer against water is preferably 70 degrees or more. If the surface of the protective film has a contact angle of less than 70 degrees, the water may not be easily removed during the washing process during the assembly process of the LCD module.

The surface protection film for an optical member according to the present invention may further include an adhesive layer and a release film on the opposite side of the base film on which an antistatic antifouling layer is formed.

Figure 1 shows a cross-sectional view of the surface protection film for polarizing plates of the present invention formed antistatic antifouling layer on top of the base film according to the present invention.

Referring to FIG. 1, an antistatic antifouling layer L1 is formed on an upper portion of the base film F1, and an adhesive layer A and a release film F2 are sequentially formed on a lower portion thereof.

The base film (F1) used in the protective film according to the present invention may be a biaxially stretched transparent polymer film, and a biaxially stretched polyethylene terephthalate film is appropriate in consideration of heat resistance and transparency. Preferably the thickness of the said base film (F1) is 30-80 micrometers. If the thickness of the base film is less than 30 ㎛ insufficient protection function, if it is more than 80 ㎛ there is a problem that excessively unsuitable in terms of cost and the lifting phenomenon of the protective film may occur.

Hereinafter, specific embodiments of the present invention will be described. However, the following examples are merely provided to explain the present invention in more detail, whereby the technical scope of the present invention is not limited. Hereinafter, examples and comparative examples of a protective film and a conventional protective film including an antistatic antifouling layer according to the present invention are presented.

Example 1

PEDOT / PSS (poly 3,4-ethylenedioxythiophene / polystyrene sulfonic acid: Poly 3,4-ethylenedioxythiophene / Polystyrene sulfonic acid) (Baytron PH, manufactured by Bayer) 3 g, fluorinated hydrocarbon group having a solid content of 15% by weight A coating solution of 10 g of a urethane resin having a side chain (Diaroma PFW, Dainichi Seika Co., Ltd.), 0.2 g of aziridine curing agent, 100 g of a mixed solvent of water and ethanol, isopropyl alcohol, butyl alcohol, etc. was prepared and biaxially stretched. 0.06 μm was applied to one side of the 38 μm polyethylene terephthalate film on a solids basis, and dried at 100 ° C. for 30 seconds to form an antistatic antifouling layer. At this time, the two-liquid hardening method and the thermosetting method which mixed and used an aziriline hardening | curing agent were used. Again, on the opposite side of the film was coated with 25 μm of an acrylic weakly peelable pressure-sensitive adhesive having a molecular weight in the range of solids, and a release film was laminated thereon to prepare a protective film.

Example 2

PEDOT / PSS (poly 3,4-ethylenedioxythiophene / polystyrene sulfonic acid: Poly 3,4-ethylenedioxythiophene / Polystyrene sulfonic acid) (Baytron P, manufacturer 獨 Bayer) 3 g, fluorinated hydrocarbon group with a solid content of 30% by weight A biaxially stretched coating solution was prepared by preparing a coating solution of 6 g of an acrylic resin having a side chain (ribecoat 100, Japan Paint of the manufacturer), 0.2 g of isocyanate curing agent, 100 g of mixed solvent such as water and ethanol, isopropyl alcohol, and butyl alcohol. The polyethylene terephthalate film was mixed in a thickness of 0.06 μm on one side based on solid content, and dried at 100 ° C. for 30 seconds to form an antistatic antifouling layer. Again, on the opposite side of the film was coated with 25 μm of an acrylic weakly peelable pressure-sensitive adhesive having a molecular weight in the range of solids, and a release film was laminated thereon to prepare a protective film.

Example 3

4 g of polyaniline conductive polymer (Ormecon), 6 g of acrylic resin having a fluorinated hydrocarbon group side chain having a solid content of 30% by weight (Rivecoat 100, Japan Paint, Japan), 0.2 g of isocyanate curing agent, 0.2 g of water and ethanol, iso 100 g of a mixed solvent such as propyl alcohol and butyl alcohol were prepared to prepare a coating solution, and a biaxially stretched 38 μm polyethylene terephthalate film was mixed and coated on one side by 0.05 μm on a solid basis, and dried at 100 ° C. for 30 seconds to prevent antistatic charge. A sexual antifouling layer was formed. Again, on the opposite side of the film was coated with 25 μm of an acrylic weakly peelable pressure-sensitive adhesive having a molecular weight in the range of solids, and a release film was laminated thereon to prepare a protective film.

Comparative Example 1

PEDOT / PSS (Poly 3,4-ethylenedioxythiophene / polystyrene sulfonic acid: Poly 3,4-ethylenedioxythiophene / Polystyrene sulfonic acid) (Baytron PH, manufacturer 獨 Bayer) 3 g, water content of urethane resin with a solid content of 30% by weight (Neoresin R-986, Mavecia manufacturer) 6 g, oxazoline curing agent 0.2 g, water and a coating solution of 100 g of a mixed solvent such as ethanol, isopropyl alcohol, butyl alcohol, to prepare a biaxially stretched 38 ㎛ poly The mixture of the styrene terephthalate film was coated with 0.06 μm on a solids basis on one side, and dried at 100 ° C. for 30 seconds to form an antistatic antifouling layer. Again, on the opposite side of the film was coated with 25 μm of an acrylic weakly peelable pressure-sensitive adhesive having a molecular weight in the range of solids, and a release film was laminated thereon to prepare a protective film.

Comparative Example 2

PEDOT / PSS (Poly 3,4-ethylenedioxythiophene / polystyrene sulfonic acid: Poly 3,4-ethylenedioxythiophene / Polystyrene sulfonic acid) (Baytron PH, manufactured by Bayer) 3 g 5 g of perfluoropolyester (DK X2, Daikin) and 0.2 g of isocyanate curing agent were mixed with a suitable solvent to prepare a coating solution, and a biaxially stretched 38 µm polyethylene terephthale film was mixed to provide a solid content on one side. 0.06 micrometer was applied, and it dried for 30 second at 100 degreeC, and formed the antistatic antifouling layer. Again, on the opposite side of the film was coated with 25 μm of an acrylic weakly peelable pressure-sensitive adhesive having a molecular weight in the range of solids, and a release film was laminated thereon to prepare a protective film.

Comparative Example 3

Polyester water dispersion with self-emulsifying property on one side of biaxially stretched polyethylene terephthalate film having a thickness of 38 μm (Product Name: Binonal MD1200, Manufacturer: Toyobo, Japan), Cationic Antistatic Agent (Static Side 3000G, Manufacturer) : ACL) and an isocyanate type curing agent were blended in a solid content ratio of 100: 5: 3, mixed with a suitable solvent, coated with 0.05 μm on a solids basis, and dried at 100 ° C. for 30 seconds to form an antistatic antifouling layer. Again, on the opposite side of the film was coated with 25 μm of an acrylic weakly peelable pressure-sensitive adhesive having a molecular weight in the range of solids, and a release film was laminated thereon to prepare a protective film.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Surface Resistance (Ω / Area) 6.0 × 108 8.0 × 108 1.0 × 109 1.0 × 109 1.0 × 109 5.0 × 109 Wear resistance ○ ○ ○ ○ ○ △ Solvent resistance ○ ○ ○ ○ ○ × Ink adhesion Unpeeled Unpeeled Unpeeled Unpeeled Peeling Peeling Contact angle (degree) 85 89 87 55 105 40 Water repellency ○ ○ ○ × ○ × Protective film automatic peelability ○ ○ ○ ○ × ○ Ease of inspection ○ ○ ○ ○ ○ ○

In Table 1 above,

1. Surface resistance was measured for 1 minute by applying applied voltage of 100 V under the temperature of 23 ℃ and 55% humidity using SM8210 of Dong-A Radio Industry, and measured the surface resistance.

2. Abrasion resistance is characterized by the friction fastness tester using a cellulose nonwoven fabric (brand name: Bemcot, manufacturer: Ukhwaseong) on a 20 mm × 20 mm friction horseshoe, reciprocating 100 times with a load of 1.2 Kg to prevent surface damage. Visual observation was observed.

(Circle): No surface damage, (triangle | delta): Fine scratch generate | occur | produced on the surface, x: The generation | occurrence | production of the fine powder by falling out of a coating film is shown.

3. Solvent resistance was achieved by using a cellulose nonwoven fabric (Brand: Bemcot, manufacturer: Ukhwaseong) in a 20 mm × 20 mm friction horseshoe using a friction fastness tester and absorbing 5 ml of ethyl alcohol and isopropyl alcohol. The damage to the surface was visually observed by reciprocating five times under a load of g.

(Circle): No surface change, (triangle | delta): Fine scratch generate | occur | produced on the surface, x: Dropping generation of a coating film is shown.

4. Print adhesiveness after printing and drying using solvent ink, acryl-based tape (Product Name: 31B tape, Manufacturer: Ildong Electric) was applied 5 times back and forth with a roller of 2 kg and peeled to check the peeling degree of printing ink. It was.

5. Contact angle The contact angle of water was measured using a Phoenix 300 manufactured by Suface Electro Optics.

6. Water repellency was added dropping 3 ml of water on the surface of the protective film and then rubbing (loading) under a load of 50 g and then dropping the water again to shake off the water to confirm the water splashing phenomenon.

7. The protective film automatic peelability was confirmed when peeling the protective film using an acrylic adhesive tape.

At this time, (circle): Excellent protective film peelability, x: The protective film non-peeling (peeling tape peeling) is shown.

8. The ease of inspection was determined by cross nicol after attaching the protective film to the polarizing plate to determine the ease of inspection.

As shown in the results of Table 1, Comparative Example 1 did not include a fluorinated hydrocarbon group in the antistatic antifouling layer, it was difficult to implement a pollution-resistant function and a water-resistant function. In the binder resin used in Comparative Example 2, since the fluorine atoms are bonded in the main chain, the non-adhesive property of the binder resin is too strong, resulting in poor printing and dropping of printing inks for information recording, and the surface is too slippery. The loading failure occurred due to the flow down during the loading of the protective film when the peeling of the protective film in the polarizing plate using the peeling tape was too low adhesive force of the protective film surface and the peeling tape occurred a phenomenon that the protective film does not peel off.

Comparative Example 3 is difficult to implement the water-repellent properties due to the hydrophilic properties of the cationic antistatic agent added for the antistatic function, staining occurs when the surface is washed with a solvent such as alcohol by the antistatic agent transferred to the surface and the antistatic function is lost It has a disadvantage.

The protective film for an optical member according to the present invention satisfies various physical properties required by the protective film. In particular, by implementing a stable antistatic performance without the dependence of humidity, it is difficult to attach a fine material such as dust has the effect of reducing the occurrence of contamination.

In addition, due to the pollution resistance, friction resistance, and water repellency of the binder resin having a fluorinated hydrocarbon group side chain, it is possible to meet various requirements of the protective film, and to reduce the manufacturing cost by shortening the process conditions in the existing manufacturing method. You have an advantage. On the other hand, by improving the protective function of the optical member (for example, a polarizing plate, etc.), it is easy to handle and has the effect of lowering the defective rate that may occur in the manufacturing and distribution process.

Claims (10)

A surface protection film for an optical member having an antistatic antifouling layer formed on an upper portion of a base film, wherein the antistatic antifouling layer comprises an optically conductive polymer and a binder resin having a fluorinated hydrocarbon group side chain in a polymer main chain Surface protection film for members. The surface protection film of claim 1, wherein the antistatic antifouling layer is 100 parts by weight of the binder resin and 1 to 10 parts by weight of the conductive polymer. The surface protection film for an optical member according to claim 1, wherein the antistatic antifouling layer further comprises a curing agent. The surface protective film of claim 1, wherein the conductive polymer is at least one selected from the group consisting of polyacetylene, polyaniline, polypyrrole, and polythiophene. The surface protective film for an optical member according to claim 1, wherein the polymer main chain is at least one copolymer mixture selected from the group consisting of acrylic resins, urethane resins and polyesters. The surface protection film for an optical member according to claim 1, wherein the binder resin is a mixture further comprising at least one selected from the group consisting of acrylic resins, urethane resins and polyesters. The surface protective film for an optical member according to claim 1, wherein the binder resin having a fluorinated hydrocarbon group side chain has 1 to 50% by weight of a fluorinated hydrocarbon group. The surface protection film for an optical member according to claim 1, wherein the antistatic antifouling layer has a thickness of 0.02 to 1 µm. The surface protection film for an optical member according to claim 1, wherein the surface resistance of the surface protection film for optical member is 10 ¹⁰ Ω / area (Ω / Sq) or less. The surface protection film for an optical member according to claim 1, wherein the contact angle of the antistatic antifouling layer with respect to water is 70 degrees or more.

Images