KR101579454B1 - Display pretection film and Method for manufactureing the same - Google Patents

Abstract

A screen protection film according to an embodiment of the present invention includes: a first sub-assembly film on which a hard coating layer is formed on a top surface of a PET (PolyEthylene Terephthalate) film layer; A second sub-assembly film in which a primer layer is formed on the upper surface of the PP (polypropylene) film layer, and a self-adhesive layer is formed on the lower surface of the PP film layer; And an adhesive layer for bonding the lower surface of the PET film layer and the upper surface of the primer layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen protective film,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a screen protective film, and more particularly, to a screen protective film applicable to a product requiring a high-function scratch value 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.

In this pattern, a protective film for a light guide plate or a protective film for a prism sheet, an acrylic or rubber-based adhesive is coated on a single layer of polypropylene or polyethylene, or a release coating is applied to the outer layer, a high- Respectively.

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, there is a disadvantage that the film surface of PP (polypropylene) resin type is vulnerable to scratches. In other words, when you touch the screen with a stylus pen, a scratch mark appears on the screen.

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.

In addition, 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, and 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.

Also, when the PET liner 150 is removed and adhered to the display, a defect that the acryl-red adhesive layer 140 is transferred to the surface of the display occurs.

In addition, since the acrylic adhesive layer 140 is not easily adhered on the surface of the PET film layer 110, there is a disadvantage that the charging layer 130 must be formed in between.

Further, in the case of the acrylic adhesive layer 140, when the PET liner 150 is removed and attached to the display surface, the surface drying time is increased. As a result, bubbles and wrinkles are generated.

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

It is another object of the present invention to provide a screen protection film and a method of manufacturing the screen protection film which do not require a drying time without being transferred to the surface of the display when attached to a display.

Another object of the present invention is to provide a screen protection film which is well adhered to a PET (PolyEthylene Terephthalate) film while enhancing an antistatic function, and a method for manufacturing the screen protection film.

The present invention provides a screen protection film which is not transferred onto the surface of a display when a display is attached thereto but does not require a drying time in order to achieve the above-mentioned problems.

The screen protection film may be formed by,

A first sub-assembly film on which a hard coating layer is formed on an upper surface of a PET (PolyEthylene Terephthalate) film layer;

A second sub-assembly film in which a primer layer is formed on the upper surface of the PP (polypropylene) film layer, and a self-adhesive layer is formed on the lower surface of the PP film layer; And

And an adhesive layer for bonding the lower surface of the PET film layer and the upper surface of the primer layer.

At this time, the PP film layer may be a CPP (Casting Polypropylene) film for antistatic function.

Further, the PP film layer and the self-adhesive layer may be fused by heat treatment.

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%.

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

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

The thicknesses of the hard coating layer, the PET film layer, the adhesive layer, the primer layer, the PP film layer, and the self-adhesive layer may be 2 microns, 18 microns, 3 microns, 3 microns 45 microns, and 20 microns, respectively .

On the other hand, another embodiment of the present invention includes a first sub-assembly film producing step of producing a first sub-assembly film on which a hard coating layer is formed on a top surface of a PET (PolyEthylene Terephthalate) film layer; A second sub-assembly film producing step of producing a second sub-assembly film in which a primer layer is formed on the upper surface of the PP (polypropylene) film layer, and a self-adhesive layer is formed on the lower surface of the PP film layer; And a sub-assembly film adhering step of adhering the lower end surface of the PET film layer and the upper surface of the primer layer to each other.

At this time, the first sub-assembly film forming step may include: preparing a PET film; And forming a hard coat layer on the upper surface of the PET film.

Also, the second sub-assembly film forming step may include: preparing a PP film and a self-adhesive film; Heat-treating and fusing the PP film and the self-adhesive film; And forming a primer layer on the upper surface of the fused film layer.

In addition, the sub-assembly film adhering step may include: preparing the first sub-assembly film and the second sub-assembly film; Applying an adhesive to the lower surface of the PET film layer and the upper surface of the primer layer; And bonding the lower surface of the PET film layer to the upper surface of the primer layer.

According to the present invention, since a self-adhesive system is used without using an acrylic adhesive system, a drying time is not required without being transferred to a display surface when attached to a display, and dust and foreign matter adhere to the outer surface of the film due to transfer, It is possible to solve the problem that occurs.

Further, as another effect of the present invention, the use of a CPP (Casting PolyPropylene) film having an antistatic function by removing the electrification treatment layer enhances the antistatic function and reduces the cost and weight.

Another advantage of the present invention is that a primer layer is formed on the upper surface of the CPP film, whereby the CPP film can be well adhered to the PET film.

1 is a general screen protective film structure.
2 is a view illustrating a structure of a screen protective film according to an embodiment of the present invention.
3 is a flowchart showing a process of forming a first sub-assembly film 210 composed of the PET film layer 211 and the hard coating layer 213 shown in FIG.
4 is a flowchart showing a process of forming a second sub-assembly film 250 composed of the PP film layer, the self-adhesive layer 223, and the primer layer 230 shown in FIG.
5 is a flowchart showing a process of bonding the first sub-assembly film 210 and the second sub-assembly film 250 formed by the processes of FIGS.

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. Also, when a part is formed as "whole" on the other part, it means not only that it is formed on the entire surface (or the front surface) of the other part but also not on the edge part.

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 is a view illustrating a structure of a screen protective film according to an embodiment of the present invention. 2, the screen protection film 200 includes a first sub-assembly film 210, a second sub-assembly film 220 attached to the flat display surface, a first sub-assembly film 210, And an adhesive layer 240 for adhering the sub-assembly film 250.

The first sub-assembly film 210 has a structure in which a hard coating layer 213 is formed on the upper surface of a PET (Poly Ethylene Terephthalate) film layer 211. The PET film layer 211 is a PET film. Examples of a method for molding the PET film layer 211 include a blowing method in which a bubble is formed by an air pressure difference after application of a resin, and a method in which an extrusion T-die is used for casting.

The hard coat layer 213 is formed by UV (Utraviolet) coating on the upper surface of the PET film layer 211. For example, a hard hard coat layer 213 is formed by coating a surface hardness 4H hardness UV hardening type hard coating agent on the upper surface of the PET film layer 211 and drying it.

The second subassembly film 250 is formed by forming a primer layer 230 on the upper surface of a polypropylene film layer 221 and forming a self-adhesive layer 223 on the lower surface of the PP film layer 221, Is formed.

The PP film layer 221 may be a CPP (Casting PolyPropylene) film for antistatic function. The PP film layer 221 is a PP film. Examples of the method for forming the PP film layer 221 include a blowing method of bubble-forming by an air pressure difference after application of a resin, and a method of casting by an extrusion T-die.

The base film 220 is formed by fusing the PP film layer 221 and the self-adhesive layer 223 by heat treatment. Further, the PP film and the self-adhesive film in the form of a film solid are melted at about 140 ° C to 150 ° C to be fused.

The self-adhesive layer 223 is in the form of a film in which a metallocene, a rubber-based resin and a PP resin are mixed. 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.

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

The primer layer 230 is formed by applying liquid urethane acrylate on the upper surface of the PP film layer 221. Of course, the application is performed using a micro gravure method or the like.

The adhesive layer 240 functions to bond the first sub-assembly film 210 and the second sub-assembly film 250 to each other. To this end, an adhesive is applied to the surfaces of the first subassembly film 210 and the second subassembly film 250. As the adhesive, a urethane-based adhesive may be used.

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

Layer Thickness (unit: 탆) Hard coating layer 2 PET film layer 18 Adhesive layer 3 Primer layer 3 PP film layer 45 Self-adhesive layer 20

The screen protection film 200 shown in FIG. 2 includes a first sub-assembly film on which a hard coating layer is formed on a top surface of a PET (PolyEthylene Terephthalate) film layer, a second sub-assembly film on a top surface of a polypropylene Producing a second sub-assembly film in which a primer layer is formed and a self-adhesive layer is formed on the lower surface of the PP film layer; and bonding the upper surface of the primer layer to the lower surface of the PET film layer Lt; / RTI > This will be explained sequentially with reference to FIGS. 3 to 5. FIG.

3 is a flowchart showing a process of forming a first sub-assembly film 210 composed of the PET film layer 211 and the hard coating layer 213 shown in FIG. Referring to FIG. 3, a PET film is prepared (step S310).

The hard coating layer 320 is formed by applying a hard coating agent on the upper surface of the prepared PET film (step S320). Of course, the PET film may be a commercially available finished product preformed by a blowing method of bubble-forming by an air pressure difference after resin application and a method of casting by an extrusion T-die. Alternatively, the hard coat layer 320 may be formed during the production of the PET film.

4 is a flowchart showing a process of forming a second sub-assembly film 250 composed of the CPP film layer, the self-adhesive layer 223, and the primer layer 230 shown in FIG. Referring to FIG. 4, a PP film and a self-adhesive film are prepared (step S410).

The prepared PP film and the self-adhesive film are fused by heat treatment (step S420). The fusion process is carried out by melting the PP film and the self-adhesive film on different rollers at about 140 ° C to 150 ° C to fuse each other

By this fusion process, the base layer 220 composed of the self-adhesive layer 223 and the PP film layer 221 is formed.

Thereafter, the primer layer 230 is formed by applying acrylic urethane in the liquid state on the upper surface of the PP film layer 221 (step S430).

Of course, when applying acryl urethane for forming the primer layer 230, a micro gravure method, a gravure method, a roll coating method, or the like can be used.

5 is a flowchart showing a process of bonding the first sub-assembly film 210 and the second sub-assembly film 250 formed by the processes of FIGS. Referring to FIG. 5, a first sub-assembly film 210 produced by the process of FIG. 3 and a second sub-assembly film 250 produced by the process of FIG. 4 are prepared (step S510).

The adhesive is applied to the lower surface of the first sub-assembly film 210, that is, the lower end surface of the PET film layer 211 and the upper surface of the second sub-assembly film 250, that is, the upper surface of the primer layer S520). Of course, it is also possible to apply the adhesive only to the lower end surface of the first sub-assembly film 210 without applying adhesive to both sides.

This is because the primer layer 230 itself has adhesiveness.

After the application of the contact material, the lower surface of the PET film layer and the upper surface of the primer layer are adhered to each other to complete a screen protection film (step S530).

200: Screen Coding Film
210: first sub-assembly membrane
211: PET (PolyEthylene Terephthalate) film layer
213: Hard coating layer
221: PP (PolyPropylene) film layer
223: Primer layer
240: adhesive layer
250: Second sub-assembly membrane

Claims (12)

A first sub-assembly film on which a hard coating layer is formed on an upper surface of a PET (PolyEthylene Terephthalate) film layer;
A second sub-assembly film in which a primer layer is formed on the upper surface of the PP (polypropylene) film layer, and a self-adhesive layer is formed on the lower surface of the PP film layer; And
An adhesive layer for bonding the lower surface of the PET film layer and the upper surface of the primer layer;
Wherein the screen protection film comprises a transparent film.
The method according to claim 1,
Wherein the PP film layer is a CPP (Casting PolyPropylene) film for antistatic function.
The method according to claim 1,
Wherein the PP film layer and the self-adhesive layer are fused by heat treatment.
The method according to claim 1,
Wherein the self-adhesive layer comprises a mixture of a metallocene, a rubber-based resin and a PP resin.
5. The method of claim 4,
Wherein the mixing ratio of the metallocene, the rubber-based resin and the PP resin is 23 wt%: 8 wt%: 69 wt%.
The method according to claim 1,
Wherein the primer layer is formed by applying acrylic urethane in a liquid state to the PP film layer.
The method according to claim 6,
Wherein the liquid acryl urethane is applied to the PP film layer by a microgravure method.
The method according to claim 1,
Wherein the hard coating layer, the PET film layer, the adhesive layer, the primer layer, the PP film layer, and the self-adhesive layer have thicknesses of 2 microns, 18 microns, 3 microns, 3 microns, 45 microns, and 20 microns, respectively.
A first sub-assembly film producing step of producing a first sub-assembly film on which a hard coating layer is formed on a top surface of a PET (PolyEthylene Terephthalate) film layer;
A second sub-assembly film producing step of producing a second sub-assembly film in which a primer layer is formed on the upper surface of the PP (polypropylene) film layer, and a self-adhesive layer is formed on the lower surface of the PP film layer; And
A sub-assembly film adhering step of adhering the lower end surface of the PET film layer and the upper surface of the primer layer;
The method of claim 1,
10. The method of claim 9,
The first sub-assembly film generation step may include:
Preparing a PET film; And
And forming a hard coating layer on the upper surface of the PET film.
10. The method of claim 9,
The second sub-assembly film generation step may include:
Preparing a PP film and a self-adhesive film;
Heat-treating and fusing the PP film and the self-adhesive film; And
And forming a primer layer on the upper surface of the fused film layer.
12. The method of claim 11,
Wherein the sub-assembly film adhering step comprises:
Preparing a first subassembly film and a second subassembly film;
Applying an adhesive to the lower surface of the PET film layer and the upper surface of the primer layer; And
And bonding the lower surface of the PET film layer to the upper surface of the primer layer.

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