KR101627566B1 - Flat display pretection film and Method for manufactureing the same - Google Patents

Abstract

The screen protection film according to an embodiment of the present invention includes a base layer made of a PP series, the bottom surface of which is attached to an adherend by a self-adhesive method; A primer coating layer coated on an upper surface of the base layer; And a UV (Ultra Violet) layer adhered to an upper surface of the primer coating layer.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a flat display screen protective film and a method for manufacturing the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen protective film, and more particularly, to a flat panel display screen protective film applicable to a product requiring a high-performance scratch plate and a method of manufacturing the same.

Display-related devices such as LCD (Liquid Crystal Display) module, polarizer, TV, notebook computer, and monitor are used to prevent contamination and surface scratches caused by dust or dirt in the air during transportation, It is general to treat the protective film in a state in which it is attached to the screen.

In the case of these modern display devices, it is very important to maintain the cleanliness of the display device in order to maintain a clean screen condition from the time of producing and packaging the product to the end user. Therefore, in order to maintain the cleanliness and operating characteristics of the surface Use a protective film.

However, the composite sheet products such as the diffusion plate and the light guide plate need to simplify the structure and reduce the cost continuously in order to reduce the cost and improve the quality. In the simplification process of such a product, it is possible to reduce the amount of the composite sheet used by adjusting the refractive index of the light guide plate by providing concave and convex on the surface of the product such as the light guide plate and the prism sheet.

On the other hand, in order to protect the composite sheet for a light guide plate and a prism into which a pattern is incorporated, the adhesive strength of the film is required to be high and the lifting phenomenon between the film and the substrate can be prevented.

Such a pattern is a protective film for a light guide plate or a protective film for a prism sheet, in which acrylic and rubber based adhesives are coated on a single layer of polypropylene and polyethylene, or a release coating is applied to the outer layer, Were used.

For example, a rubber film or an acrylic adhesive layer is laminated on one side of a polyolefin (polyethylene, polypropylene) resin base material to form a protective film. However, in this case, there has been a problem that a process such as a gravure coating method or a roll coating method is additionally used to form a functional adhesive layer.

In addition, although a protective film is formed by using a mixture of a propylene polymer and an ethylene polymer with an adhesive layer on the end face of the substrate, a process of further coating the pressure sensitive adhesive layer is also required. This has caused problems such as a change over time due to the temperature change of the pressure-sensitive adhesive at high temperature and high humidity, and a transition transfer and a stop line of the pressure-sensitive adhesive.

As a prior art to solve this problem, development of a self-adhesive film which does not require a coating has been attempted. In some cases, a protective film is produced by using a polypropylene resin as a substrate layer and an ethylene-vinyl acetate copolymer (ethylene vinyl acetate (EVA)) as a self-adhesive layer. Such a film can be produced in one step using a multilayer casting and blow molding apparatus.

However, polar molecules such as vinyl acetate are sensitive to high temperature and high humidity. In particular, the adhesive strength is more than 2 times higher at a temperature higher than 70 ° C. At 90 ° C or higher, the adhesive strength is increased 10 times or more. Further, dust and foreign matter adhere to the outer surface of the film due to transfer, thereby causing contamination.

Figure 1 is a conceptual diagram showing an example of one of the schemes described above. 1, a hard coating layer 120 is placed on the upper surface of a PET (Poly Ethylene Terephthalate) film layer 110, and a charging layer 130 and an acrylic adhesive layer (not shown) are formed on the lower surface of the PET film layer 110 140, and a PET liner 150 are placed in order.

However, this method has a disadvantage in that the film surface of the PP (polypropylene) series is vulnerable to scratches. For example, scratch marks are formed on the surface of a product due to the load caused by the loading of the finished product in the work process.

In addition, when the PET liner 150 is removed and attached to the display, the acrylic adhesive layer 140 is transferred to the glass surface of the display, and the defects such as lifting and tacky transfer phenomenon occur.

Glass protection films are used to prevent these scratch marks. However, in the case of such a glass protective film, UV (Ultraviolet Ray) coating is required, which not only raises the material cost but also increases the weight.

Accordingly, there is a demand for a screen protective film which can prevent a scratch value of a high function that does not cause a scratch mark even when the scratch value is severe.

In addition, there is a demand for a screen protective film that is not transferred to the glass surface of the display when attached to a display.

1. Korean Patent No. 10-1332315 2. Korean Patent No. 10-1316707

The present invention provides a flat panel display screen protection film and a method of manufacturing the same, which can prevent a high-performance scratched mark that does not cause a scratch mark even when the scratch value is severe. It has its purpose.

It is another object of the present invention to provide a flat panel display screen protective film which is not transferred onto the glass surface of a display when attached to a display, and a method for manufacturing the same.

It is another object of the present invention to provide a flat panel display screen protective film which not only has a reduced material cost but also has a reduced weight and an anti-static function, and a manufacturing method thereof.

The present invention provides a screen protective film capable of preventing a high-performance scratch mark that does not cause scratch marks even when scratches are severe.

The screen protection film may be formed by,

A base layer attached to the adherend by a self-adhesive method on the lower surface and made of a PP series;

A primer coating layer coated on an upper surface of the base layer; And

And a UV (Ultra Violet) layer adhered to the upper surface of the primer coating layer.

At this time, the base layer may include a polypropylene (PP) layer; An antistatic support layer formed on the lower surface of the PP layer; And a self-adhesive layer formed on the lower surface of the support layer and of self-adhesive type.

In addition, the PP (polypropylene) layer, the support layer, and the self-adhesive layer may be simultaneously formed by injecting a solid chip type material into the T-die and performing heat treatment.

The PP layer and the support layer may be formed by mixing an antistatic treatment agent with a material of a solid chip type, respectively, in order to prevent electrification.

The primer coating layer may be formed by applying acrylic urethane in a liquid state to the base layer.

In addition, the application may be performed using a microgravure method.

The thicknesses of the UV layer, the primer coating layer, the PP layer, the support layer, and the self-adhesive layer may be 3 microns, 2 microns, 20 microns, 60 microns, and 15 microns, respectively.

Further, the self-adhesive layer may be a mixture of a metallocene, a rubber-based resin and a PP resin.

At this time, the mixing ratio of the metallocene, the rubber-based resin and the PP resin is 23 wt%: 8 wt%: 69 wt%.

Further, the self-adhesive layer has an adhesive strength of 8 gf / mm.

The resistance value of the antistatic property may be 10 to 15?.

Further, the UV layer may have a hardness of 3H to 5H.

On the other hand, another embodiment of the present invention includes a base layer preparing step of preparing a base layer made of a PP series, the bottom surface of which is adhered to an adherend in a self-adhesive manner; A primer coating forming step of forming a primer coating layer on an upper surface of the base layer; And forming a UV layer on the upper surface of the primer coating layer by UV (ultraviolet).

At this time, the base layer preparation step may include a PP (polypropylene) layer, a support layer for preventing electrification formed on the lower surface of the PP layer, and a self-adhesive layer formed on the lower surface of the support layer, Preparing a material in the form of each solid chip for the substrate; Injecting each solid chip type material into a T-die; Heat treatment at 140 캜 to 150 캜; And drying the base layer for a predetermined time to form the base layer.

According to the present invention, a UV coating layer and a primer coating layer can be formed to prevent a scratch that does not cause a scratch mark even when scratching is severe.

Another advantage of the present invention is that a self-adhesive system is not transferred to the display surface when attached to a display, and bubble, lifting, and adhesive transfer phenomenon can be prevented.

Further, as another effect of the present invention, there is an advantage that, by removing the electrified layer and applying the PP film instead of the PET film, the manufacturing cost is reduced, and the function of preventing static electricity while reducing the weight can be enhanced .

1 is a general screen protective film structure.
2 illustrates a structure of a screen protection film 200 according to an embodiment of the present invention.
FIG. 3 is a flow chart showing the process of creating the base layer 210 shown in FIG.
FIG. 4 is a flowchart illustrating a process of creating a screen protection film 200 using the base layer 210 shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. When a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case directly above another portion but also the case where there is another portion in between.

Conversely, when a part is "directly over" another part, it means that there is no other part in the middle. In addition, when a certain portion is formed as "whole" on another portion, it means that it is formed not only on the entire surface (or the front surface) of the other portion but also on the edge portion.

Hereinafter, a screen protection film according to an embodiment of the present invention and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.

2 illustrates a structure of a screen protection film 200 according to an embodiment of the present invention. 2, the screen protection film 200 includes a base layer 210 adhered on a display surface 270 as a substrate, a primer coating layer 220 coated on an upper surface of the base layer 210, A UV (Ultra Violet) layer 230 adhered to the upper surface of the primer coating layer 220, and the like.

Here, the base layer 210 is formed on the lower surface of the support layer 213, a support layer 213 for preventing electrification formed on the lower surface of the PP layer 211, a polypropylene layer 211, A self-adhesive type self-adhesive layer 215, and the like.

The PP layer 211, the support layer 213, and the self-adhesive layer 215 are simultaneously formed using a T-die coating method. In other words, they are simultaneously formed by injecting a solid chip type material into the T-die and then performing heat treatment.

That is, the PP series resin and the antistatic treatment agent are dried, molded into a solid chip form, accommodated in a T-die (not shown), and heated until the temperature reaches 140 to 150 ° C. Of course, each of the T-die is made up of three, and each solid chip form is mixed and injected into each T-die.

 At a temperature of 140 ° C to 150 ° C, the solid chip type material is melted and the multilayered PP layer 211, the support layer 213 and the self-adhesive layer 215 can be simultaneously extruded. Of course, at this time, the sheet is extruded in the form of a sheet having a constant thickness and an appropriate width.

Of course, the PP layer 211 and the support layer 213 must perform an antistatic function. Thus, each antistatic treatment agent is mixed with the solid chip type material and accommodated in the T-die.

As the antistatic treatment agent, any known agent may be used so far as it does not impair the properties of the PP layer and / or the support layer and does not inhibit the curing.

Examples thereof include cationic surfactants (ammonium salts, sulfomium, phosphonium), anionic surfactants, polyoxyethylene alkylamines, polyhydric alcohol derivatives, nonionic surfactants, alkylamine derivatives, alkylphosphate amine salts, fatty acid esters , Alkyldiethanolamido, poly (styrene glycol) ester, amphoteric surfactant, organic boron compound, polythiophene, polyaniline, ionic functional group-containing polymer, and the like. Of course, such an antistatic treatment system is mixed with the solid chip type material of the PP layer and the support layer, respectively, as a solid powder, and is heat treated and cured.

The support layer 213 is formed by mixing a PP series resin and an antistatic treatment agent. The support layer 213 simultaneously performs an antistatic function as a support layer for supporting the entire screen protective film.

The antistatic treatment agent is mixed so that the support layer 213 and the PP layer 211 have a resistance value of about 10 to 15? For the antistatic function.

The self-adhesive layer 215 may be a mixture of a PP series resin and a rubber series resin. That is, it is formed by copolymerizing VA (Vinyl Acetate) monomer with PP resin (Resin). In this case, the adhesive strength varies depending on the VA content, and when the external physical effect is applied, the adhesion strength increases greatly (around 70 ° C).

Alternatively, the self-adhesive layer 215 may be a mixture of a metallocene, a rubber-based resin and a PP resin. Metallocene is a generic term for bis (cyclopentadienyl) metal, a new organometallic compound in which cyclopentadienes and transition metals are bonded in a sandwich structure.

Most metallocenes are sublimable, and in the case of ferrocene, they are thermally stable and do not decompose even when heated to 470 ° C. It dissolves in most organic solvents such as alcohol and ether but does not dissolve in water. In most acidic solutions it decomposes to generate cyclopentadiene. An electrophilic reaction easily takes place, acylation / alkylation by Friedel-Crafts reaction occurs, and sulfone may also occur.

Each name of metallocene attaches a cene to the end of each metal element name. For example, cobaltocene (Co), osmocene (Os), ruthenocene (Ru), and the like.

The advantage of such a self-adhesive layer 223 is that it does not require drying time such as an acrylic adhesive. In addition, since the self-adhesive system is used, it is not transferred to the surface of the display when attached to the display.

In an embodiment of the present invention, the mixing ratio of the metallocene, the rubber-based resin and the PP resin is 23 wt%: 8 wt%: 69 wt%, but the present invention is not limited thereto.

Particularly, a polyolefin elastomer (POE) metallocene may be used as the metallocene.

Also, the adhesive strength of the self-adhesive layer 215 is about 8 gf / mm.

A primer layer 220 is formed on the base layer 210. The primer layer 210 is for a cross-linking function that facilitates attachment between the base layer 210 and the UV layer 230.

This primer layer 220 is formed by applying liquid urethane acrylate on the upper surface of the base layer 210. Of course, the application is performed using a micro gravure method, a gravure method, a roll method, or the like.

The UV layer 230 serves to prevent a load due to the loading of the finished product during the display work process or a scratch mark on the display surface 270 when the user is using it. The UV layer 230 is formed by UV (Utraviolet) coating on the upper surface of the primer coating layer 220 as a hard coating layer.

For example, a surface hardness 3H to 5H hardness UV hardening type hard coating agent is applied on the upper surface of the primer coating layer 220 and dried to form the UV layer 230. [

The display surface 270 may be a surface such as an organic light emitting display device, a plasma display panel, or a flat CRT (Cathode Ray Tube) as well as a liquid crystal display .

In the embodiment of the present invention, the PP layer 211 and the support layer 213 are made of PP (polypropylene) based resin. However, the present invention is not limited to this and the CPP (Casting PolyPropylene) It is possible.

The screen protection film 200 according to an embodiment of the present invention is manufactured as follows.

Layer Thickness (unit: 탆) UV layer 3 Primer coating layer 2 PP layer 20 Support layer 60 Self-adhesive layer 15

The screen protection film 200 shown in FIG. 2 includes a base layer preparation step of preparing a base layer made of a PP series, the bottom surface of which is adhered to the adherend by a self-adhesive method; A primer coating forming step of forming a primer coating layer on an upper surface of the base layer; And a UV layer forming step of forming a UV (Ultra Violet) layer on the upper surface of the primer coating layer. This will be explained sequentially with reference to Figs. 3 to 4. Fig.

FIG. 3 is a flow chart showing the process of creating the base layer 210 shown in FIG. 3, a supporting layer (213 in FIG. 2) for preventing electrification formed on the lower surface of the PP layer 211 and a lower layer (not shown) of the supporting layer 213 Each solid chip type material for forming a self-adhesive layer formed on the surface of the self-adhesive type is prepared (step S310).

Each of these solid chip type materials may be a PP series resin, a rubber series resin, an antistatic treatment agent, a metallocene or the like. Of course, these materials are configured according to the mixing ratio in advance according to the properties of each layer.

Further, the PP series resin, the rubber series resin, the antistatic treatment agent, the metallocene and the like are dried and then molded into a solid chip form and accommodated in a T-die (not shown) (step S320). Of course, the T-die is composed of three pieces for molding the PP layer 211, the support layer 213, and the self-adhesive layer 215, and each solid chip form is mixed and injected into the T-die.

Thereafter, heat is applied until the temperature reaches 140 to 150 캜 (step S330). In addition, heat is applied to the melting point temperature since the melting point for the solid chip type material is close to about 140 ° C to 150 ° C.

The solid chip type material is melted at 140 to 150 ° C, and the PP layer 211, the support layer 213 and the self-adhesive layer 215, which are multilayered by the T-die, are simultaneously extruded and dried for a predetermined time (Step S340). Of course, at this time, the thickness and the width are adjusted for each T-die so as to be extruded in the form of a sheet having a constant thickness and an appropriate width.

Thereafter, after a certain drying time has elapsed, the base layer 210 comprising the PP layer 211, the support layer 213 and the self-adhesive layer 215 is completed.

FIG. 4 is a flowchart illustrating a process of creating a screen protection film 200 using the base layer 210 shown in FIG. Referring to FIG. 4, the base layer 210 produced by FIG. 3 is prepared (step S410).

A primer coating layer 220 (FIG. 2) is formed on the upper surface of the prepared base layer 210 (step S420). In addition, the primer coating layer 220 is formed by applying liquid urethane acrylate on the upper surface of the base layer 210.

Of course, when applying acryl urethane for forming the primer coating layer 220, a micro gravure method, a gravure method, a roll coating method, or the like can be used.

Then, a UV (Ultra Violet) layer 230 is formed on the upper surface of the primer coating layer 220 (step S230). In addition, a high hardness UV hardening type hard coating having a surface hardness of 3H to 4 is applied to form the UV layer 230. Of course, an irradiator or the like is used for curing after the UV coating agent is applied.

200: Screen Protective Film
210: base layer
211: PP (PolyPropylene) layer
213: Support layer
215: self-adhesive layer
270: Display surface

Claims (1)

A base layer preparation step of preparing a base layer made of a PP series, the base layer being adhered to the adherend by a self-adhesive method;
A primer coating forming step of forming a primer coating layer on an upper surface of the base layer; And
And forming a UV layer on the upper surface of the primer coating layer,
Wherein the base layer comprises:
A PP (polypropylene) layer;
An antistatic support layer formed on the lower surface of the PP layer; And
And a self-adhesive layer formed on a lower surface of the support layer and self-adhesive,
Wherein the self-adhesive layer comprises a mixture of a metallocene, a rubber-based resin and a PP resin,
Wherein the primer coating layer is formed by applying acrylic urethane in a liquid state to the base layer so that the UV layer is adhered to the base layer,
The base layer preparation step may include:
Preparing a respective solid chip type material for forming the PP (polypropylene) layer, the support layer, and the self-adhesive layer;
Injecting each solid chip type material for the PP (polypropylene) layer, the support layer, and the self-adhesive layer into a three-piece T-die;
Heating the three T-dies to 140 < 0 > C to 150 < 0 > C to melt the respective solid chip type material;
The molten self-adhesive layer, the support layer, and the PP (PlolyPropylene) layer are extruded from each of the three T-dies in the form of a sheet and dried for a predetermined period of time. Thereafter, the self-adhesive layer, And forming the base layer in the order of a platinum (PP) layer.

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