WO2013009055A2

WO2013009055A2 - Paste for film coating and method for manufacturing a protective film having a restoring function using the paste

Info

Publication number: WO2013009055A2
Application number: PCT/KR2012/005416
Authority: WO
Inventors: 정협화; 정재협
Original assignee: 주식회사 마이크로인덱스
Priority date: 2011-07-13
Filing date: 2012-07-09
Publication date: 2013-01-17
Also published as: WO2013009055A9; WO2013009055A3; CN103814067A; KR101122922B1

Abstract

According to the present invention, a paste for a film coating and a protective film having a restoring function using the paste are manufactured by a method comprising the steps of: mixing a hardener into a polymer synthetic resin solution including a polymer synthetic resin which has high oil-absorbing properties or elastic properties, and then allowing a hardening reaction and an aging reaction so as to form a gel material having an elastic material; placing the gel material into a solvent containing a dispersant; providing, using a stirring facility, ultrasonic waves and a cooling means to the solvent in which the gel material is placed, so as to form a sol material into which microparticles are dispersed; mixing a binder into the solvent, in which the sol material is formed, so as to form a paste; and coating the upper surface of a film with the formed paste so as to form a coating layer.

Description

Film coating paste and method of manufacturing a protective film having a restoring function using the same

The present invention relates to a film coating paste and a method for manufacturing a protective film having a restoring function using the same, and more particularly, a protective film for protecting the screen by being attached to a screen of a display device using a film coating paste. It relates to a method for producing.

Recently, as a display device, a liquid crystal display (LCD) having a feature such as light weight, thinness, and low power consumption in a large device such as a CRT has been widely used.

In particular, the liquid crystal display device is widely used in the TV field, the notebook field, the computer field, the tablet PC field, the navigation field, etc. as the image quality is improved by the improvement of the liquid crystal material and the development of the fine pixel processing technology.

Since the screen on which the image of the liquid crystal display device is displayed is easily exposed from physical damage or chemical damage such as scratch, the LCD protective film is attached to the screen to protect the liquid crystal display device from them.

Since the LCD protective film may affect the image quality of the image displayed from the LCD when physical damage such as the scratch is repeatedly generated, it is preferable to replace the LCD protective film after a certain time of use.

In particular, electronic devices such as touch phones, smartphones, or tablet PCs that have a large number of touches on the screen of the liquid crystal display have a high possibility of scratches, and thus, the frequency of replacement of the LCD protective film is higher than that of other fields. There must be more.

It is an object of the present invention to provide a method for forming a film coating paste for forming a coating film which can be removed by restoring physical damage such as scratches to its original state.

Another object of the present invention to provide a protective film formed with a coating film using the paste formed above.

In order to achieve the above object of the present invention, the film coating paste according to an embodiment of the present invention is a curing reaction and aging by blending a curing agent in a polymer synthetic resin solution containing a polymer resin having high oil absorption or elastic properties Forming a gel material having an elastic material by allowing the reaction to proceed, placing the gel material in a solvent containing a dispersing agent, and using a stirring apparatus to add the solvent containing the gel material. At the same time by providing an ultrasonic wave and a cooling means to form a sol (Sol) material dispersed in the fine particles and may be prepared by a method comprising the step of blending a binder in the solvent is formed (Sol) material.

The polymer synthetic resin may include a polyurethane-based material. The binder may include a polymer resin material having a carboxyl group (-COOH) or a hydroxyl group (-OH). Thus, the binder may include a second curing agent such that the coating film has a form of a semi-reticulate-structure system including the carboxyl group or the hydroxyl group.

In order to achieve the above object of the present invention, a method for producing a protective film having a restoring function according to an embodiment of the present invention is a curing agent in a polymer synthetic resin solution containing a polymer synthetic resin having high oil absorption or elastic properties Mixing the mixture to form a gel material having an elastic material by allowing the curing reaction and the aging reaction to proceed, placing the gel material in a solvent containing a dispersant, and putting the gel material A step of forming a sol (Sol) material dispersed in fine particles by providing an ultrasonic wave and a cooling means at the same time by using a stirring solvent to form a solvent, by mixing a binder in the solvent formed with the sol (Sol) material to form a paste And coating the formed paste on an upper surface of the film to form a coating film.

Alternatively, in the forming of the coating film, the coating film may be cured by providing a hot air drying system. In the forming of the coating film, the coating film may be coated by a microgravure coating hot air drying line or a comma coating hot air drying line or a silkscreen hot air drying line method. The coating film may be formed to a thickness of 6 to 60㎛. On the other hand, the manufacturing method may further include forming an adhesive layer for attaching the film on the screen on the lower surface of the film.

According to an embodiment of the present disclosure, after the forming of the paste, the filtering of the paste may be further performed to remove fine particles having a size of more than 20 μm from the sol material. .

According to the film coating paste as described above and a method of manufacturing a protective film having a restoring function by using the same, a liquid crystal protective film is formed by forming a coating film including fine particles having an elastic restoring force against an external force on an upper surface of the film. By manufacturing, when the external force is applied to the screen of the liquid crystal display, that is, when the physical damage such as scratches on the coating film is caused by the elastic restoring force of the fine particles in about 3 seconds to 30 minutes It can be removed and restored to its original state.

Therefore, when the LCD protective film is attached to the screen of the LCD, physical damage such as scratches are recovered, and thus may be used semi-permanently unless chemical damage occurs.

As a result, a user of the LCD protective film for the LCD may not only solve the inconvenience of replacing the LCD protective film at any time, but also reduce the cost.

Accordingly, the LCD protective film may be applied and applied to the surface of any product that may cause physical damage such as the scratch in addition to the LCD.

1 is a flowchart schematically showing a film coating paste according to an embodiment of the present invention and a method of manufacturing a liquid crystal protective film using the same.

2 is a view for explaining the principle of restoration of the fine particles of the paste prepared by the flow chart of FIG.

3 is a view for explaining a network structure system according to the curing reaction of the paste prepared by the flow chart of FIG.

4 is a view schematically showing a liquid crystal protective film manufactured according to the order of FIG. 1 according to an embodiment of the present invention.

5 to 7 are actual photographs of the scratch experiment on the LCD protective film shown in FIG.

Hereinafter, a method of manufacturing a protective film having a restoring function using a film coating paste according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. A singular expression includes a plural expression unless the context clearly indicates otherwise. In this application, the terms “comprise” or “have” are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art.

Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Film coating paste and manufacturing method of liquid crystal protective film using the same

1 is a flow chart schematically showing a film coating paste according to an embodiment of the present invention and a method for manufacturing a liquid crystal protective film using the same, Figure 2 is a restoration principle of the fine particles of the paste prepared by the flow chart of FIG. 3 is a view for explaining a network structure system according to the curing reaction of the paste prepared by the flow chart of FIG.

1 to 3, in order to prepare a film coating paste having a restoring function, a curing agent is added to a polymer synthetic resin solution including a polymer synthetic resin having a high oil absorption property or an elastic property by a crosslinker through a stirring facility and a curing reaction. (Crosslinking) to form a gel (Gel) material (S10).

In step S10, the blended polymer resin solution and the curing agent are aged for a predetermined time to form the gel material. In this case, the aging process may be performed for about 1 to 24 hours at a temperature of about 40 to 80 ℃.

The polymer synthetic resin may include a polyurethane-based material having high oil absorption properties or elastic properties. Thus, since the polyurethane-based polymer synthetic resin is highly oil-absorbing, it is resistant to moisture and excellent in weather resistance against external environmental changes, and thus may contribute to securing stability of the LCD protective film manufactured by the present method.

In addition, the polymer synthetic resin may include at least one of an acrylic resin, an polyester resin, an epoxy resin, a polystyrene resin, and a polyurethane resin having an elastic property.

The polymer synthetic resin solution may include about 10 to 60% by weight of solids including the polymer synthetic resin to form the gel material. If the solid content is contained in the polymer synthetic resin solution is less than about 10% by weight, it is not preferable that the gelling ratio is too low, and if it is contained in excess of 60% by weight, the viscosity is too high when mixing This is because the operation is not easy and the probability of a defect occurring in the formation of the gel material is very high. In addition, the polymer synthetic resin solution more preferably has a solid content of about 20 to 40% by weight.

Table 1 below is experimental data showing the oil absorption and stickiness (adhesiveness) characteristics according to the content of the core monomer of the polymer synthetic resin forming the gel (Gel) material.

Specifically, Table 1 shows methylisocyanate, ethylene glycol (Ethylenglycol), isoprondiamine (Isophronediamine), and triethylenediamine (Polymerization), respectively, while varying the mol (Mol) content. Experimental data showing changes in oil absorption and stickiness.

Table 1

Polymer Synthetic Resin Monomer	Oil absorption and adhesion (sticky)
Methyl isocyanate	The higher the content, the higher the oil absorption, and the more sticky.
Ethylene glycol	The higher the content, the higher the oil absorption, and the more sticky.
Isoprondiamine	The lower the content, the higher the oil absorption, and the less the stickiness.
Triethylenediamine	The higher the content, the higher the oil absorption, and the more sticky.

Referring to Table 1, as a result of confirming the change in oil absorption according to the content of monomers, it was confirmed that the higher the content of the other three monomers except for isopronediamine (Isophronediamine) the higher the oil absorption affecting the elastic properties Could. In addition, it was also confirmed that the adhesion increased relatively as the oil absorption force increased.

Accordingly, by synthesizing the monomer of the polymer synthetic resin in a suitable formulation (Formulation) so that the oil absorption is excellent and the adhesiveness is lowered, it is possible to form a polymer synthetic resin having an excellent gel (Gel) material, based on this will be described below It was confirmed that the paste including the elastic fine particles could be formed.

Table 2 below is experimental data showing the characteristics of the gel reaction and stickiness according to the change of the curing agent content for the polymer synthetic resin solution containing the polymer synthetic resin made by the synthesis of Table 1.

TABLE 2

Hardener	Gel Reaction / Adhesive
Isocyanate	; The higher the content, the faster the gel reaction rate; The faster the gel speed, the less sticky but less sol material formation; The lower the content, the slower the gel reaction rate; Slower gel speed increases stickiness; If stickiness increases, gel material does not form
Aziridine series	; The higher the content, the faster the gel reaction rate; The faster the gel speed, the less sticky but less sol material formation; Gel reaction rate is slower than isocyanate curing agent, but progresses more stably; The lower the content, the slower the gel reaction rate; Slower gel speed increases stickiness; The more stickiness, the poor gel formation

Referring to Table 2, it was confirmed that the gel material can be formed by adding the curing agent. In addition, it was confirmed that the stickiness can also be adjusted according to the content of the curing agent.

When the curing agent is blended in less than 100: 1 ratio compared to the polymer synthetic resin solution, some of the solids are not preferable because the curing reaction is not preferable, and when the mixture is mixed in excess of about 100: 10 ratio from the gel Due to the rapid hardening reaction in the process of forming the (Gel) material, since the probability of the occurrence of defects during the formation of the sol (Sol) material is very high, it is preferable to be incorporated in the polymer synthetic resin solution at a ratio of about 100: 1 to 10. . In addition, the curing agent is more preferably blended in the polymer synthetic resin solution in a ratio of about 100: 2 to 5.

For example, the curing agent may include an isocyanate material when the polymer synthetic resin solution includes a polyurethane-based polymer resin. The higher the content of the isocyanate-based curing agent, the faster the reaction rate in the formation of the gel (gel) material, but also reduces the stickiness, but may form a defect in the formation of the sol (sol) material, the lower the content of the gel ( At the same time, the stickiness is severely generated and the gel material may not be formed. Therefore, the isocyanate-based curing agent should be adjusted to an appropriate content to control the reaction rate and stickiness of the gel (Gel) material is formed.

In addition, the curing agent may include an aziridine-based material. The aziridine-based curing agent, like the isocyanate-based curing agent, the higher the content, the faster the reaction rate to form the gel (Gel) material while reducing the stickiness may be a cause of failure when forming the sol (Sol) material. However, the reaction rate at which the gel material is formed may be slower and more stable than the isocyanate curing agent. In addition, the smaller the content of the aziridine-based curing agent, the slower the reaction rate at which the gel (Gel) material is formed and at the same time, the stickiness is severely generated, and the more severe the gel material may not be formed. Accordingly, the aziridine-based curing agent, like the isocyanate-based curing agent, should control the reaction rate and stickiness at which the gel material is formed by controlling the appropriate content.

As a result, the curing agent preferably contains an isocyanate curing agent and an aziridine curing agent when the polymer synthetic resin solution contains a polyurethane polymer resin.

Subsequently, the gel material is added to a solvent containing a dispersant (S20). The solvent may be coated on the upper surface of the film to provide a fluidity and solids control function of the paste prepared by the method, and then volatilized and removed in a hot air drying system.

Thus, the solvent may include ethyl acetate (Ethylacetate) to be easily removed in the hot air drying process while providing fluidity smoothly. Such a solvent may be prepared in the same proportion as the polymer synthetic resin solution.

Subsequently, the gel material mixed with the solvent is stirred using a homomixer and a stirrer to form a sol material dispersed into the microparticles 10, for example, microparticles (S30).

When the size of the fine particles 10 exceeds about 20 μm, the fine particles 10 may function as impurities during coating on the upper surface of the film. Therefore, the size of the fine particles 10 is preferably about 20 μm or less.

The fine particles 10 have an elastic restoring force against an external force. The microparticles 10 may have spherical or similar non-spherical shapes to have elastic restoring force in all directions.

Specifically, when a force (F) is applied from the outside to the fine particles 10 as shown in Figure 2, the force (F) can be shrunk while absorbing the force, the fine particles 10, again after a few seconds Alternatively, after a few minutes, the fine particles 10 may be restored to their original state by the elastic restoring force.

That is, when the scratch is generated by applying the force (F) to the coating film formed by the paste including the fine particles 10, the scratch can be restored to the original state by the elastic restoring force.

In this case, in order to form a coating film having a uniform thickness, the fine particles 10 may preferably have a sol material having a size of about 20 μm or less.

In the step S30, the ultrasonic wave may be provided while stirring through a homomixer and a stirrer to disperse the gel material. In addition, by providing a cooling water in the stainless container containing the solvent and the gel material to cool the heat generated in the process of providing the ultrasonic wave, the gel material can be more efficiently dispersed. have. Accordingly, by performing the S30 step, it is possible to form a stable colloidal (Sol) material.

Next, a paste is formed by blending the binder 20 with the sol material in which the fine particles 10 are dispersed (S40). The binder 20 has a function of attaching the fine particles 10 to the film by having a network structure system according to a curing reaction when forming a coating film on the film through the paste prepared by the method. It can improve the surface hardness while removing the stickiness, and can perform the function of reinforcing the physical properties of the fine particles (10). Such a binder may typically be made of a polymer acrylic resin material or a polyurethane-based material.

The binder 20 may include a resin material having a carboxyl group (-COOH) or a hydroxyl group (-OH). For example, the binder 20 may include a urethane resin or an acrylic resin having the carboxyl group or the hydroxyl group.

Thus, in step S40, as shown in FIG. 3, a second curing agent may be added to react with the carboxyl group or the hydroxyl group of the binder 20 to have a network structure system shape.

Here, reference numeral “20” in FIG. 3 indicates a binder chain (Macromolecula Binder Chain) in the network system, and “10” indicates microparticles intertwined inside the network system. Here, the second curing agent may include an aziridine-based material.

As such, when the binder 20 has a network structure system, while improving adhesiveness between the film and the paste coating film coated on the film while removing adhesiveness, that is, stickiness, which is a cause of poor curing reaction, The coating film may have a rigid structure, that is, a hardness of about 1H or more based on the pencil hardness, and thus, the coating film may have a structure stable to external impact.

When the binder 20 is less than about 100: 5 in contrast to the sol material, the binder 20 is not preferable because it is difficult to provide sufficient adhesion with the film, and may be mixed in excess of about 100: 20. In this case, it is not preferable because it reduces the elastic restoring properties by reducing the proportion of the fine particles (10). Therefore, the binder 20 is preferably mixed at a ratio of about 100: 5 to 20 relative to the sol material. In addition, the binder 20 is more preferably mixed at a ratio of about 100: 8 to 10 compared to the sol (Sol) material.

In addition, the second curing agent is preferably added at a ratio of about 100: 5 or less relative to the binder 20 so as not to be unnecessarily wasted while having a desirable network structure system from the carboxyl group. In addition, the second hardener is more preferably added at a ratio of about 100: 3 relative to the binder 20. Thus, in the step S40 it is possible to form a stable paste by blending the appropriate materials.

Subsequently, the paste is filtered using a cartridge filter to remove the fine particles 10 having a predetermined size or more (S50). This is to uniformly form the coating film surface of the upper surface of the film formed from the paste. In addition, since the fine particles 10 having a size exceeding about 20 μm are not preferable because the thickness of the coating film is uniform and it is difficult to achieve excellent leveling, the fine particles 10 may have the size in the range of about 20 μm or less. It is desirable to filter the particles 10. In the present exemplary embodiment, the step S50 is described as being performed after mixing the binder 20. However, the step S50 may be performed after forming the fine particles 10 of the step S30. Through these steps, a paste is prepared.

Hereinafter, a method of manufacturing a protective film having a restoring function using the paste will be further described.

Subsequently, the paste filtered by filtering the fine particles 10 is coated on the upper surface of the film to form a coating film (S60). At this time, in order to cure the paste while removing the solvent contained in the paste, the coating film may be a comma coating-hot air drying system or a microgravure-hot air drying system.

In addition, in the step S60, in addition to the above-mentioned method, the coating film may be formed by applying a kiss roll coating method, a slot die coating method, a silk screen coating method, or the like. Thereafter, by forming an adhesive layer on the surface opposite to the coating film of the film to be attached to the screen of the liquid crystal display device, the manufacturing of the LCD protective film can be completed. In this case, the adhesive layer may be a silicone pressure sensitive adhesive and an acrylic pressure sensitive adhesive having a wetting property.

As described above, by coating the paste on the upper surface of the film to form a coating film, a LCD protective film for protecting the screen of the LCD may be manufactured. In the present exemplary embodiment, the protective film is limited to the LCD protective film for protecting the screen of the LCD, but the protective film may also include a film for protecting the screen of other types of display devices.

LCD protective film

4 is a view schematically showing a liquid crystal protective film manufactured according to the procedure of FIG. 1 according to an embodiment of the present invention.

4, the LCD protective film 100 according to an embodiment of the present invention includes a film 200 and the coating film (300).

The film 200 may use any one of polyethylene terephthalate, biaxially oriented polypropylene, and polycarbonate. The film 200 may have a thickness of about 30 to 250㎛.

This is not preferable because the film 200 serves as a base material of the LCD protective film 100, and when the thickness thereof is less than about 30 μm, it is too thin to play a role as a base material. It is because it is not preferable to exceed the flexible property because it is difficult to utilize the flexible characteristics as a film.

The coating film 300 is formed on the upper surface of the film 200 to be transparent or opaque. The coating film 300 is formed by coating a paste prepared according to the flowchart in FIG. 1 on the top surface of the film 200.

Specifically, the coating film 300 is coated on the upper surface of the film 200 by using a microgravure coating machine or a comma coating machine, etc. at a speed of about 3 to 15m / s, and then included in the paste In order to remove the solvent it is formed by performing a hot air drying at a temperature of about 100 ℃ through a hot air drying line and at the same time thermosetting.

In addition, as the paste of the coating film 300 is cured in the above process, a harder layer may be formed while having a network structure system. Thus, the liquid crystal protective film 100 having the coating film 300 is wound in the form of a film roll. In addition, the time for curing the paste to form the coating film 300 is preferably performed within about 5 minutes. If the curing time exceeds about 5 minutes, there is a workability problem and shrinkage deformation of the LCD protective film 100 may occur. The coating film 300 thus formed may be attached to the film 200 with excellent adhesion while not only having sufficient elastic restoring force but also having a surface hardness of about 1H or more based on the pencil hardness.

Accordingly, when physical damage such as a scratch is generated by the external force on the coating film 300, the scratch is removed by the elastic restoring force of the fine particles of the coating layer, so that the coating layer may be restored to its original state. In this case, the coating film 300 is not so thin when the thickness t is less than about 6 μm, so that the fine particles of the coating film 300 may be damaged by the scratch. It is not preferable because it is too thick to unnecessarily increase the overall thickness of the LCD protective film 100. Therefore, the thickness t of the coating film 300 is preferably about 6 to 60㎛. In addition, the coating film is more preferably 10 to 40㎛.

In addition, the LCD protective film 100 is attached to the screen of the liquid crystal display device to the coating film protective film 400 for protecting the coating film 300 on the upper surface of the coating film 300 and the lower surface of the film 200. The adhesive layer 500 and the lower surface of the adhesive layer 500 may further include a release film 600 for protecting the adhesive layer 500.

Accordingly, when the LCD protective film 100 is attached to the screen of the LCD, physical damage such as scratch is recovered, and thus may be used semi-permanently unless chemical damage occurs.

As a result, the user of the LCD protective film 100 can not only solve the inconvenience of frequently replacing the LCD protective film 100, but can also expect a cost reduction. In addition, the coating film prepared using the paste can be widely applied to the general protective film as well as the liquid crystal protective film.

Example

100 kg of the polymer synthetic resin solution containing 40% by weight of the polymer-containing resin and 3 kg of a hardener prepared by mixing 1: 1 isocyanate and aziridine were added thereto, stirred for 6 hours, and stirred for 24 hours in a aging room at a temperature of 60 ° C. Aged to form a gel (gel) material in a solid state, and the gel (gel) material was put in a stainless container containing 100kg of ethyl acetate as a solvent and pulverized the gel material into fine particles by a homomixer for 8 hours. After stirring for 8 hours to provide ultrasonic and cooling water to form a sol (Sol) material dispersed in about 10 to 30㎛ average particles, 20kg binder having a carboxyl group and 0.6kg of aziridine, a second curing agent is added to the curing reaction The paste is formed by stirring sufficiently for 6 hours to form a network system through the filter, and the paste is filtered by a cartridge filter. Remove the fine particles of size 20㎛ or more, and the paste is coated on the upper surface of the polyethylene terephthalate-based film in a microgravure coating line at a line speed of 3m / min, and then set the paste at a temperature of 100 ℃ Hot air curing while passing through a hot air drying line to prepare a liquid crystal protective film having a coating film having a thickness of 10㎛, 20㎛, 30㎛ on the upper surface of the film.

Comparative Example 1

The paste described in the above embodiment was coated on the upper surface of the polyethylene terephthalate-based film in a microgravure coating line at a line speed of 3 m / min, and then the paste was set at a temperature of 80 ° C. in a hot air drying line. Hot air was cured while passing through to prepare a liquid crystal protective film having a coating film having a thickness of 10 μm, 20 μm, and 30 μm on the upper surface of the film.

Comparative Example 2

After the second paste was prepared except the aziridine, which is a curing agent, in the method for preparing a paste described in the above embodiment, the second paste was coated at a line speed of 3 m / min on the upper surface of the polyethylene terephthalate-based film. Next, the second paste was hot air cured while passing through a hot air drying line set at a temperature of 100 ° C. to prepare a liquid crystal protective film having a coating film having a thickness of 10 μm, 20 μm, and 30 μm on the upper surface of the film.

evaluation

The performance of the resilience according to the adhesiveness and curing temperature to confirm the curing reaction to the coating film formed through the above-described Examples and Comparative Examples 1, 2 were tested.

At this time, the resilience test of the toothbrush-shaped steel brush (Steel Brush) in the same manner as in the photograph of Figure 5 after artificially scratching the surface of the coating film of the LCD protective film five times or more with a force of about 500g, It progressed by measuring the time when this scratch disappears.

TABLE 3

Classification / Coating Method	Coating thickness	Sticky	Hardness	Restoration time
EXAMPLE Micro Coating	10 μm	none	1H	Within 30 seconds
	20 ㎛	none	2H	Within 10 seconds
	30 μm	none	3H	Within 3 seconds
Comparative Example 1 Micro Coating	10 μm	Stickiness	0	Incomplete hardening, not restored
	20 ㎛	Stickiness	0	Incomplete hardening, not restored
	30 μm	Stickiness	0	Incomplete hardening, not restored
Comparative Example 2 Micro Coating	10 μm	Stickiness	0	Incomplete hardening, not restored
	20 ㎛	Stickiness	0	Incomplete hardening, not restored
	30 μm	Stickiness	0	Incomplete hardening, not restored

Referring to Table 3, all of the coating film in the above embodiment was shown to have a surface hardness of 1 to 3H while no stickiness occurred, but the coating film in Comparative Examples 1 and 2 caused adhesiveness due to poor curing reaction and The surface hardness was also poor.

Accordingly, the coating film in Comparative Examples 1 and 2 can be easily damaged by the external impact due to the sticky sticky, it was confirmed that it can not be used for coating on the upper surface of the film.

Thus, the coating film in the embodiment is a slight difference in the time to restore first depending on the thickness of the coating film as shown in the photos of Figures 5 to 7 showing the scratch experiment process through this, all scratches are restored to remove On the other hand, in Comparative Examples 1 and 2 it was confirmed that the scratch formed on the coating film is not restored.

Therefore, it was evaluated that the liquid crystal protective film prepared according to the embodiment of the present invention can be restored to its original state through elastic restoring force while having a stable curing reaction and physical damage such as scratch.

As described above, according to the embodiments of the present invention, the LCD protective film may be prepared by forming a coating film using a paste including fine particles having an elastic restoring force on an upper surface of the film. In particular, when physical damage such as scratches occur in the coating film, the scratches may be naturally removed by themselves by the elastic restoring force of the microparticles and restored to the original state.

Therefore, when the LCD protective film is attached to the screen of the LCD, physical damage such as scratches can be naturally healed, and thus can be used semi-permanently unless chemical damage occurs. Accordingly, the LCD protective film In addition to eliminating the inconvenience of frequently replacing the cost can be reduced accordingly.

In particular, the LCD protective film may be preferably used in various products in which physical damage such as the scratch may occur in addition to the LCD.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims

Forming a gel material having an elastic material by blending a crosslinker with a polymer synthetic resin solution including a polymer synthetic resin having high oil absorption or elasticity to allow a curing reaction and a aging reaction to proceed;

Placing the gel material in a solvent containing a dispersant;

Forming a sol (Sol) material dispersed in fine particles by simultaneously providing ultrasonic and cooling means to the solvent containing the gel material by using a stirring apparatus;

Forming a paste by blending a binder with the solvent in which the sol material is formed; And

And forming a coating film by coating the formed paste on an upper surface of the film.
The method of claim 1, wherein the polymer synthetic resin comprises a polyurethane-based material.
The method of claim 1, wherein the binder comprises a polymer resin material having a carboxyl group (-COOH) or a hydroxyl group (-OH).
The method of claim 3, wherein the binder comprises a second curing agent such that the coating film is cured into a semi-reticulate-structure structure including the carboxyl group or the hydroxyl group. .
The method of claim 4, wherein the curing agent includes an isocyanate curing agent and the second curing agent comprises an aziridine curing agent.
The method of claim 1, wherein the forming of the coating layer comprises curing the coating layer by providing a hot air drying system.
The method of claim 1, wherein the forming of the coating layer comprises coating the coating layer using a microgravure coating hot air drying line, a comma coating hot air drying line, or a silk screen hot air drying line method.
The method of claim 1, wherein in the forming of the coating film, the coating film is formed in a thickness of 6 to 60 µm.
The method of claim 1, further comprising forming an adhesive layer on the bottom surface of the film to attach the film to the screen.
The method of claim 1, wherein the film comprises one of polyethylene terephthalate, biaxially oriented polypropylene, and polycarbonate.
The method of claim 1, wherein the film has a thickness of 30 to 250 μm.
The method of claim 1, further comprising, after forming the paste, filtering the paste to remove fine particles having a size of more than 20 μm in the sol material. Method for producing a film.