protective film

Abstract

A protective film includes a film and a coating disposed on the film. The coating includes an adhesive and beads disposed in the adhesive. The adhesive includes a protruding portion in contact with each of the beads and a flat portion not in contact with the beads. A tray assembly includes a tray and a coating disposed on the tray. A coating composition includes an adhesive and polyurethane beads disposed in the adhesive.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2020-0149362, filed with the Korean Intellectual Property Office on November 10, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a protective film, a tray assembly, and a coating composition. Background Technology

[0004] The importance of display devices has steadily increased with the development of multimedia technology. In response, various types of display devices, such as organic light-emitting diodes (OLEDs) and liquid crystal displays (LCDs), have been developed. These display devices are now used in a variety of mobile electronic devices, such as portable electronic devices like smartphones, smartwatches, and tablets.

[0005] During manufacturing, display devices can be transferred and stored simultaneously while being loaded onto a tray during various processing steps. The tray may include a loading space for loading the display devices. To prevent damage to the display devices during transfer, the loading space of the tray may have dimensions corresponding to the size of the display devices. If the display devices move within the loading space, they may be damaged due to collisions with adjacent components.

[0006] It should be understood that this background section is intended to provide some useful context for understanding the art. However, this background section may also include ideas, concepts, or knowledge that were not known or understood by a person skilled in the art prior to the relevant valid application date of the subject matter disclosed herein. Summary of the Invention

[0007] This disclosure provides a protective film that can be adhered to a loading target element and that can have excellent anti-slip properties relative to a tray.

[0008] This disclosure also provides a tray on which the target element can be stably loaded due to the excellent anti-slip properties of the anti-slip pad relative to the target element.

[0009] This disclosure also provides a coating composition that can be applied to objects such as substrate films or trays to exhibit excellent anti-slip properties.

[0010] Embodiments of the protective film may include a film and a coating disposed on the film. The coating may include an adhesive and beads disposed in the adhesive. The adhesive may include protruding portions that contact each bead and flat portions that may not contact the beads.

[0011] The adhesive may have a glass transition temperature of approximately 0°C to approximately 25°C.

[0012] The adhesive may include at least one of methyl methacrylate, butyl acrylate, and hydroxyethyl methacrylate.

[0013] The methyl methacrylate may have a weight ratio of about 42 wt% to about 58 wt% relative to the total weight of the adhesive, the butyl acrylate may have a weight ratio of about 37 wt% to about 53 wt%, and the hydroxyethyl methacrylate may have a weight ratio of about 4 wt% to about 6 wt%.

[0014] The protruding portion may be surrounded by the flat portion.

[0015] The thickness of the protruding portion may be less than the thickness of the flat portion.

[0016] The average thickness of the adhesive can be smaller than the average particle size of the beads.

[0017] The beads may have an average particle size of approximately 5 μm to approximately 10 μm.

[0018] The beads may include polyurethane beads.

[0019] The weight ratio of the beads to the coating can be from approximately 9 wt% to approximately 11 wt%.

[0020] Embodiments of the tray assembly may include a tray and a coating disposed on the tray. The coating may include an adhesive and beads disposed in the adhesive. The adhesive may include protruding portions that contact each of the beads and flat portions that may not contact the beads.

[0021] The adhesive may have a glass transition temperature of approximately 0°C to approximately 25°C.

[0022] The adhesive may include at least one of methyl methacrylate, butyl acrylate, and hydroxyethyl methacrylate.

[0023] The methyl methacrylate may have a weight ratio of about 42 wt% to about 58 wt% relative to the total weight of the adhesive, the butyl acrylate may have a weight ratio of about 37 wt% to about 53 wt%, and the hydroxyethyl methacrylate may have a weight ratio of about 4 wt% to about 6 wt%.

[0024] The beads may include polyurethane beads.

[0025] The weight ratio of the beads to the coating can be from approximately 9 wt% to approximately 11 wt%.

[0026] Examples of coating compositions may include an adhesive and polyurethane beads disposed in the adhesive. The adhesive may have a glass transition temperature of about 0°C to about 25°C. The weight ratio of the polyurethane beads relative to the total weight of the adhesive and the polyurethane beads may be about 9 wt% to about 11 wt%.

[0027] The adhesive may include at least one of methyl methacrylate, butyl acrylate, and hydroxyethyl methacrylate.

[0028] The methyl methacrylate may have a weight ratio of about 42 wt% to about 58 wt% relative to the total weight of the adhesive, the butyl acrylate may have a weight ratio of about 37 wt% to about 53 wt%, and the hydroxyethyl methacrylate may have a weight ratio of about 4 wt% to about 6 wt%.

[0029] The polyurethane beads may have an average particle size of approximately 5 μm to approximately 10 μm.

[0030] However, the aspects of this disclosure are not limited to those set forth herein. The foregoing and other aspects of this disclosure will become more apparent to those skilled in the art upon reference to the detailed description of this disclosure given below.

[0031] According to an embodiment, the protective film can be adhered to the loading target element to prevent the loading target element loaded on the tray from slipping.

[0032] The tray according to the embodiment allows the target component to be stably loaded on it because the anti-slip pad has excellent anti-slip properties relative to the target component.

[0033] The coating composition according to the embodiments can be applied to objects such as base films or trays to impart excellent anti-slip properties to each object.

[0034] It should be noted that the effects of this disclosure are not limited to those described above, and other effects of this disclosure will become apparent from the following description. Attached Figure Description

[0035] The above and other aspects and features of this disclosure will become more apparent from the detailed description of embodiments thereof with reference to the accompanying drawings, in which:

[0036] Figure 1This is a schematic cross-sectional view of the loaded target element according to an embodiment;

[0037] Figure 2 This is a schematic cross-sectional view of the pixels of a display device according to an embodiment;

[0038] Figure 3 This is a schematic perspective view of the protective film according to an embodiment;

[0039] Figure 4 This is a schematic perspective view showing the state in which the target element is loaded onto the tray according to an embodiment;

[0040] Figure 5 It is along Figure 4 A schematic cross-sectional view of the line V-V'.

[0041] Figure 6 yes Figure 5 A magnified schematic diagram of region Q;

[0042] Figure 7 This is a flowchart schematically illustrating a method for preparing a first protective film according to an embodiment;

[0043] Figure 8 and Figure 9 This is a schematic diagram of a method for preparing a first protective film according to an embodiment;

[0044] Figure 10 An example test is schematically shown for evaluating the anti-slip performance of the film coating according to an embodiment;

[0045] Figure 11 This is a schematic exploded perspective view showing the tray assembly according to an embodiment;

[0046] Figure 12 This is a schematic perspective view showing the state in which the target element is loaded onto the tray assembly according to an embodiment;

[0047] Figure 13 It is along Figure 12 A schematic cross-sectional view of line XIII-XIII';

[0048] Figure 14 This is a schematic exploded perspective view of a tray assembly according to another embodiment;

[0049] Figure 15 It is along Figure 14 A schematic cross-sectional view of line XV-XV'; and

[0050] Figure 16 This is a schematic cross-sectional view of a tray assembly according to yet another embodiment. Detailed Implementation

[0051] This disclosure will now be described more fully below with reference to the accompanying drawings, in which embodiments are illustrated. However, this disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0052] As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well (and vice versa), unless the context clearly indicates otherwise.

[0053] When a component (e.g., a layer) is referred to as being "on" another component, it can be directly on the other component, or there may be an intermediate layer. Conversely, when a component is referred to as being "directly on" another component, there may be no intermediate component.

[0054] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” may be used herein to describe the relationship of one element or feature to another element(s)(s) as shown in the accompanying drawings. For example, some of the drawings may depict the orientation of an element relative to three directions (X, Y, and Z). It will be understood that, in addition to the orientations depicted in the drawings, spatial relative terms are intended to cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as “below” or “under” other elements or features will subsequently be oriented “above” other elements or features. Thus, the term “below” can include both orientations above and below. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatial relative terms used herein will be interpreted accordingly.

[0055] In the specification and claims, for the purposes of their meaning and interpretation, the term "and / or" is intended to include any combination of the terms "and" and "or". For example, "A and / or B" can be understood to mean "A, B, or A and B". The terms "and" and "or" can be used in a combined or separate sense and can be understood to be equivalent to "and / or". In the specification and claims, for the purposes of their meaning and interpretation, the phrase "at least one of..." is intended to include the meaning of "at least one selected from the group consisting of...". For example, "at least one of A and B" can be understood to mean "A, B, or A and B".

[0056] Throughout the specification, the same reference numerals denote the same components.

[0057] The term “overlapping” or “overlapping” means that the first object may be above, below, or to the side of the second object, or vice versa. Furthermore, the term “overlapping” may include layer, stack, facing or confronting, extending throughout, covering or partially covering, or any other suitable term that will be understood and appreciated by one of ordinary skill in the art.

[0058] As used herein, the terms “approximately” or “about” include the value and are meant to be within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the error associated with a particular number of measurements (i.e., limitations of the measurement system). For example, “approximately” may mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the value.

[0059] In the following description, embodiments will be described in detail with reference to the accompanying drawings.

[0060] Figure 1 This is a schematic cross-sectional view of the target element according to an embodiment. Figure 2 This is a schematic cross-sectional view of the pixels of a display device according to an embodiment. Figure 3 This is a schematic perspective view of the protective film according to an embodiment.

[0061] Reference Figures 1 to 3 The target component 1 can be an electronic component to which protective films 100 and 300 can adhere, but the target component 1 is not limited to this. As described later, the target component 1 can be loaded onto a tray (see...). Figure 4 The electronic components are simultaneously transmitted or stored on the 500 (e.g., the display device 200). In the following description, the display device 200 will be described as an example of electronic components included in the loading target element 1, but the electronic components are not limited thereto.

[0062] According to the embodiment, the loading target element 1 may include a display device 200, a first protective film 100 disposed on one surface of the display device 200, and a second protective film 300 disposed on another surface of the display device 200.

[0063] Display device 200 can be a device for displaying moving or still images. Display device 200 can be used as a display screen for various products such as televisions, laptops, monitors, billboards, and Internet of Things (IoT) devices, as well as for portable electronic devices such as mobile phones, smartphones, tablet PCs, smartwatches, watch phones, mobile communication terminals, e-notebooks, e-book readers, portable multimedia players (PMPs), navigation systems, and ultra-mobile PCs (UMPCs).

[0064] For example, display device 200 can be any of the following: organic light-emitting display device, liquid crystal display device, plasma display device, field emission display device, electrophoretic display device, electrowetting display device, quantum dot light-emitting display device, and micro LED display device. In the following description, organic light-emitting display device will be used as an example of display device 200, but display device 200 is not limited thereto.

[0065] The display device 200 may include a first display substrate 210, a second display substrate 220 facing the first display substrate 210, and a fill layer 230 connecting the first display substrate 210 to the second display substrate 220.

[0066] The first display substrate 210 may include a first substrate 211, a light-emitting element (EMD) disposed on the surface of the first substrate 211, and a thin film encapsulation layer 217 disposed on the light-emitting element (EMD).

[0067] The first substrate 211 of the first display substrate 210 may be an insulating substrate. The first substrate 211 may be a rigid substrate such as glass.

[0068] The circuit layer CCL for driving the light-emitting element EMD can be disposed on the first substrate 211. The circuit layer CCL can be disposed between the first substrate 211 and the pixel electrode PXE, which will be described later.

[0069] The pixel electrode PXE can be disposed on the circuit layer CCL of the first display substrate 210. The pixel electrode PXE can be the first electrode (e.g., the anode electrode) of the light-emitting element EMD.

[0070] The pixel defining layer (PDL) can be disposed along the pixel boundary on the surface of the first substrate 211. The pixel defining layer (PDL) can be disposed on the pixel electrode (PXE) and can include an opening exposing the pixel electrode (PXE).

[0071] The emissive layer (EML) can be disposed on the pixel electrode (PXE) exposed by the pixel defining layer (PDL). The EML may include an organic emissive layer, and in some cases, may further include a hole injection / transport layer and / or an electron injection / transport layer as auxiliary layers for assisting light emission. The wavelength of light emitted by each EML may be the same for each pixel. For example, the EML of each pixel may emit blue light or ultraviolet light, and the second display substrate 220, described later, may include a wavelength conversion layer (WCL) to display color for each pixel.

[0072] A common electrode CME can be disposed on the light-emitting layer EML. A common electrode CME can be continuous across pixels. A common electrode CME can be an entire electrode extending across all pixels. A common electrode CME can be the second electrode (e.g., cathode electrode) of the light-emitting element EMD.

[0073] Pixel electrode (PXE), emissive layer (EML), and common electrode (CME) can constitute a light-emitting element (EMD) (e.g., OLED). Although a pixel is shown in... Figure 2 The image shows a light-emitting element (EMD), but the first display substrate 210 may include light-emitting elements (EMDs) arranged for each pixel.

[0074] The thin-film encapsulation layer 217 can be disposed on the common electrode CME. The thin-film encapsulation layer 217 may include a first inorganic layer 217a, an organic layer 217b disposed on the first inorganic layer 217a, and a second inorganic layer 217c disposed on the organic layer 217b.

[0075] The second display substrate 220 can be disposed above the thin film encapsulation layer 217 so as to face the first display substrate 210.

[0076] The second substrate 221 of the second display substrate 220 may include a transparent insulating material such as glass. The second substrate 221 may be a rigid substrate.

[0077] A light-blocking member (BML) may be disposed along the pixel boundary on the surface of the second substrate 221 facing the first substrate 211. The light-blocking member BML may overlap with the pixel defining layer (PDL) of the first display substrate 210. In a plan view, the light-blocking member BML may be formed as a grid pattern and may include openings that expose the surface of the second substrate 221.

[0078] The color filter layer CFL can be disposed on the surface of the second substrate 221 where the light-blocking member BML can be disposed. The color filter layer CFL can be disposed on the surface of the second substrate 221 that can be exposed through the opening of the light-blocking member BML.

[0079] A color filter layer (CFL) may include a colorant, such as a dye or pigment, that absorbs wavelengths different from the wavelengths of the corresponding color. For each pixel, the CFL may include a different colorant.

[0080] A first cover layer 222 for preventing the penetration of impurities such as moisture or air can be provided on the color filter layer CFL.

[0081] The partition wall PTL can be disposed on the first cover layer 222. The partition wall PTL can be configured to overlap with the light-blocking member BML. The partition wall PTL may include an opening that exposes an area where the color filter layer CFL can be disposed.

[0082] The wavelength conversion layer (WCL) can be disposed in the space exposed by the opening of the partition wall PTL. The wavelength conversion layer (WCL) can be formed using the partition wall PTL as a dam via an inkjet printing process, but it is not necessarily so.

[0083] The wavelength conversion layer (WCL) can convert the wavelength of light incident from the emissive layer (EML). The WCL may include a base resin (BRS), a scattering SCP (silicon diffuser), and a wavelength conversion material (WCP) disposed within the base resin (BRS). The base resin (BRS) may include a transparent organic material. The wavelength conversion material (WCP) may be a quantum dot, quantum rod, or phosphor, etc.

[0084] The second cover layer 223 can be disposed on the wavelength conversion layer WCL and the partition wall PTL. In other words, the second cover layer 223 can be disposed on the entire surface of the second display substrate 220.

[0085] A filler layer 230 may be disposed between the first display substrate 210 and the second display substrate 220. The filler layer 230 may fill the space between the first display substrate 210 and the second display substrate 220, and may be used to bond the first display substrate 210 and the second display substrate 220 to each other.

[0086] The first protective film 100 can be disposed on the surface of the display device 200. Figure 1 The first protective film 100 may include a substrate film 110 and a film coating 120 disposed on the surface of the substrate film 110.

[0087] The substrate film 110 can protect the surface of the display device 200. The substrate film 110 can have the same shape as the surface of the display device 200 to which the substrate film 110 can be adhered, so as to cover the entire surface of the display device 200. For example, the substrate film 110 can have a rectangular shape in a plan view.

[0088] The substrate film 110 may include, but is not limited to, at least one selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polymethyl methacrylate (PMMA), polystyrene (PS), polyvinyl chloride (PVC), polyethersulfone (PES), polyethylene (PE), and polypropylene (PP).

[0089] The film coating 120 can be applied to the surface of the substrate film 110. The film coating 120 can have anti-slip properties. The anti-slip properties of the film coating 120 can be obtained, but not necessarily, through surface irregularities including raised shapes and / or the elasticity of the film beads 122 forming raised shapes.

[0090] The membrane coating 120 may include a membrane adhesive 121 and membrane beads 122 distributed in the membrane adhesive 121.

[0091] The membrane adhesive 121 may be configured to cover the entire surface of the substrate membrane 110. The membrane adhesive 121 may surround the membrane bead 122, which will be described later, and fix the membrane bead 122 to the surface of the substrate membrane 110.

[0092] The membrane adhesive 121 may include: a flat portion 121a (see...) Figure 6 ), which may not contact the membrane bead 122 described later and includes a substantially flat surface; and a protruding portion 121b (see Figure 6 A protrusion 121b can contact and surround the flat portion 121a and the membrane bead 122. Since the membrane bead 122 is surrounded by the protrusion 121b, the protrusion 121b can have a protruding shape. The protrusion 121b can be surrounded by the flat portion 121a. The average thickness of the protrusion 121b can be less than the average thickness of the flat portion 121a, but it is not necessarily so.

[0093] The membrane adhesive 121 may include an acrylic polymer material. For example, the membrane adhesive 121 may include at least one selected from the group consisting of methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (2-HEMA).

[0094] The film adhesive 121 can have a glass transition temperature of approximately 0°C to approximately 25°C. As the glass transition temperature decreases, the adhesive properties of the film adhesive 121 can increase. However, at excessively low glass transition temperatures, a portion of the film adhesive 121 may adhere to the contact target. This phenomenon can be avoided when the glass transition temperature of the film adhesive 121 is approximately 0°C or higher. On the other hand, at excessively high glass transition temperatures, the adhesive properties may decrease, and the hardness of the film adhesive 121 may increase. The anti-slip properties of the film beads 122 may be affected by the elastic effect of the film beads 122. As the hardness of the film adhesive 121 increases, the elastic effect of the film beads 122 surrounding the film adhesive 121 may weaken, which may adversely affect the anti-slip properties. When the glass transition temperature of the film adhesive 121 is approximately 25°C or lower, the increase in the hardness of the film adhesive 121 can be limited, which allows for improved anti-slip performance.

[0095] The glass transition temperature of the membrane adhesive 121 can be controlled by adjusting the composition of the materials contained in the membrane adhesive 121. For example, a membrane adhesive 121 having a glass transition temperature of about 0°C to about 25°C can be prepared by mixing about 42 wt% to about 58 wt% of methyl methacrylate (MMA), about 37 wt% to about 53 wt% of butyl acrylate (BA), and about 4 wt% to about 6 wt% of hydroxyethyl methacrylate (2-HEMA). The weight ratio of the above materials is relative to the total weight of the membrane adhesive 121.

[0096] Specifically, the film adhesive 121 prepared by mixing about 42 wt% or more of methyl methacrylate (MMA), about 53 wt% or less of butyl acrylate (BA) and about 4 wt% to about 6 wt% of hydroxyethyl methacrylate (2-HEMA) can have a glass transition temperature of about 0°C or higher.

[0097] Furthermore, the film adhesive 121 prepared by mixing about 58 wt% or less of methyl methacrylate (MMA), about 37 wt% or more of butyl acrylate (BA) and about 4 wt% to about 6 wt% of hydroxyethyl methacrylate (2-HEMA) can have a glass transition temperature of about 25 °C or lower.

[0098] Membrane beads 122 may be disposed (e.g., irregularly distributed) within the membrane adhesive 121. The external protruding shape of the membrane coating 120 may be formed by the membrane beads 122. As described above, the membrane beads 122 may be surrounded by the membrane adhesive 121. Specifically, the membrane beads 122 may not be exposed to the outside while being surrounded by the protruding portions 121b of the membrane adhesive 121.

[0099] The average particle size of the membrane beads 122 can be from approximately 5 μm to approximately 10 μm, but is not limited thereto. The average particle size of the membrane beads 122 can be larger than the average thickness of the membrane adhesive 121, i.e., the flat portion 121a (see [reference]). Figure 6 ) and protrusion 121b (see Figure 6 The average thickness of the membrane beads 122. Since the average particle size of the membrane beads 122 can be larger than the average thickness of the membrane adhesive 121, the protruding shape of the membrane coating 120 can be caused by the membrane beads 122.

[0100] However, this disclosure is not limited thereto, and the average thickness of the membrane adhesive 121 may be greater than the average particle size of the membrane beads 122. The protruding portion 121b of the membrane adhesive 121 (see...) Figure 6 The thickness of the membrane beads 122 can be greater than the average particle size of the membrane beads 122. In other embodiments, the membrane beads 122 can be stacked in the membrane adhesive 121.

[0101] Membrane beads 122 surrounded by membrane adhesive 121 may detach from membrane adhesive 121 during the formation or application of membrane coating 120. Membrane beads 122 detached from membrane adhesive 121 may themselves become foreign objects and damage the tray on which membrane coating 120 can be deposited (see [link to documentation]). Figure 11 (500) or substrate, etc.

[0102] Due to the protrusions 121b surrounding the membrane bead 122 and the membrane adhesive 121 (see...) Figure 6 This can improve loading on the tray 500 (see...) Figure 4 The anti-slip performance of the target element 1 on the loading surface is improved. The membrane bead 122 can be elastic. Due to the elasticity of the membrane bead 122, the anti-slip performance and friction between the protrusions 121b surrounding it and another component in contact with the protrusions 121b can be improved. Specifically, the membrane bead 122 can absorb impacts caused by external forces due to its elasticity. Therefore, when slippage occurs due to contact with another component, the membrane bead 122 can absorb and disperse the impact caused by external forces due to its anti-slip performance. The membrane bead 122 can be, for example, a polyurethane bead made of polyurethane material, but is not limited thereto.

[0103] The membrane beads 122 may be included in the membrane coating 120 at a weight ratio of about 5 wt% to about 15 wt% relative to the total weight of the membrane coating 120, and in some embodiments at a weight ratio of about 9 wt% to about 11 wt%.

[0104] When the content of membrane beads 122 is about 9 wt% or more, meaningful anti-slip properties of membrane beads 122 can be exhibited. When the content of membrane beads 122 is about 11 wt% or less, it can help prevent the phenomenon that membrane beads 122 may not be surrounded by membrane adhesive 121 or that membrane beads 122 may separate from membrane adhesive 121.

[0105] In some embodiments where the glass transition temperature of the film adhesive 121 can be in the range of about 0°C to about 25°C, it is desirable that the film beads 122 be included in an amount of about 9 wt% to about 11 wt% relative to the total weight of the film coating 120. As mentioned above, the adhesive properties of the film adhesive 121 vary depending on the glass transition temperature. When the glass transition temperature is in the range of about 0°C to about 25°C, the film adhesive 121 can have adhesive properties corresponding to it. By setting the content of the film beads 122 to about 9 wt% or more under such conditions, it can be ensured that the anti-slip performance can be improved by a sufficient amount of resilient film beads 122 within the corresponding adhesive properties.

[0106] When the glass transition temperature of the film adhesive 121 is in the range of about 0°C to about 25°C, if the film beads 122 have a weight ratio of about 11 wt% or less relative to the total weight of the film coating 120, it can prevent the film beads 122 surrounded by the film adhesive 121 from separating from the film adhesive 121 and generating foreign matter.

[0107] The second protective film 300 can be disposed on another surface of the display device 200. Figure 1 The second protective film 300 can be adhered to the surface of the display device 200 to protect the surface of the display device 200. The second protective film 300 can have the same shape as another surface of the display device 200 to which the second protective film 300 can be adhered, so as to cover the entire surface of the display device 200. For example, the second protective film 300 can have a rectangular shape in a plan view.

[0108] The second protective film 300 may include at least one material selected from the group consisting of materials included in the substrate film 110. The second protective film 300 may include, but is not limited to, the same material as the substrate film 110.

[0109] The loading target element 1 may further include a first film adhesive layer 410 disposed between the display device 200 and the first protective film 100, and a second film adhesive layer 420 disposed between the display device 200 and the second protective film 300. The first film adhesive layer 410 can adhere the first protective film 100 to the surface of the loading target element 1, and the second film adhesive layer 420 can adhere the second protective film 300 to the other surface of the loading target element 1.

[0110] The first film adhesive layer 410 and the second film adhesive layer 420 may be made of an adhesive material such as optically transparent adhesive (OCA) and pressure-sensitive adhesive (PSA), for example, acrylic adhesive, silicone adhesive, polyurethane adhesive, rubber adhesive or vinyl ether adhesive, but are not limited thereto. Furthermore, the first film adhesive layer 410 and the second film adhesive layer 420 may be made of the same material.

[0111] Below, we will use the 500 loaded in the tray (see below) Figure 4 and Figure 5 The loading target element 1 on the film coating 120 with anti-slip properties is described in detail.

[0112] Figure 4 This is a schematic perspective view showing the state of the target element being loaded onto the tray according to an embodiment. Figure 5 It is along Figure 4 A schematic cross-sectional view of the line V-V'. Figure 6 yes Figure 5A magnified diagram of region Q.

[0113] Reference Figures 4 to 6 The tray 500 may include a bottom surface portion 510 and a side wall portion 520 surrounding the bottom surface portion 510. The target element 1 can be loaded into the loading space of the tray 500, defined by the top surface of the bottom surface portion 510 and the inner surface of the side wall portion 520. The target element 1 can be stored or transferred while being loaded into the loading space of the tray 500.

[0114] In one embodiment, the loading target element 1 can be mounted on the surface of the tray 500 that forms the loading space. The loading target elements 1 can be positioned spaced apart from each other. Although Figure 4 Six loading target elements 1 are shown arranged in a matrix structure with three columns in the first direction X and two rows in the second direction Y, but the number of loading target elements 1 arranged in the loading space is not limited to this.

[0115] The bottom surface portion 510 of the tray 500 can contact the film coating 120 of the first protective film 100 included in the loading target element 1. Specifically, the bottom surface portion 510 of the tray 500 can contact the protrusion 121b of the film adhesive 121 included in the film coating 120.

[0116] The friction between the bottom surface portion 510 of the tray 500 and the protrusion 121b of the film adhesive 121 restricts the movement of the loading target element 1 within the loading space of the tray 500. Specifically, the elasticity of the film bead 122 surrounded by the protrusion 121b increases the friction between the protrusion 121b surrounding the film bead 122 and the bottom surface portion 510 of the tray 500. Therefore, the anti-slip performance of the loading target element 1, including the film coating 120, is improved due to the film bead 122 and the protrusion 121b surrounding the film bead 122.

[0117] The anti-slip performance of the loaded target element 1 can vary depending on the glass transition temperature of the film adhesive 121 of the film coating 120 and the content of film beads 122 relative to the film coating 120. When the film adhesive 121 has a glass transition temperature of about 0°C to about 25°C and the weight ratio of film beads 122 to the total weight of the film coating 120 is about 9 wt% to about 11 wt%, the loaded target element 1 can have excellent anti-slip performance.

[0118] Because the film coating 120 has excellent anti-slip properties relative to the tray 500, it can prevent the loading target element 1 from moving even if the tray 500 has no boundaries. Therefore, collisions between multiple loading target elements 1 or between the loading target element 1 and the tray 500 can be prevented. In other words, when the loading target element 1 is loaded onto the tray 500 and conveyed, the film coating 120 can provide excellent anti-slip properties relative to the tray 500 for the loading target element 1, preventing movement and damage to the loading target element 1.

[0119] In the following text, reference will be made to Figures 7 to 9 The preparation according to the embodiments includes a film coating 120 (see...) Figure 1 The first protective film 100 (see) Figure 1 The method.

[0120] Figure 7 This is a flowchart schematically illustrating a method for preparing a first protective film according to an embodiment. Figure 8 and Figure 9 This is a schematic diagram of a method for preparing a first protective film according to an embodiment.

[0121] Reference Figure 7 A method for preparing a first protective film 100 according to one embodiment may include: step S11 of preparing a coating composition by mixing an adhesive with beads, step S21 of coating the coating composition onto a substrate film, and step S31 of coating a curing agent onto the substrate film coated with the coating composition.

[0122] Reference Figure 3 , Figure 7 and Figure 8 To prepare the first protective film 100 according to one embodiment, step S11, which involves preparing a coating composition by mixing an adhesive with beads, can be performed first. The adhesive AB can be followed in a subsequent step and become the film adhesive 121 of the first protective film 100, and the beads UB can be followed in a subsequent step and become the film beads 122 of the first protective film 100.

[0123] The adhesive AB may include at least one selected from the group consisting of methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (2-HEMA). The glass transition temperature of the adhesive AB can vary depending on its composition. The composition of the adhesive AB can be determined such that its glass transition temperature is in the range of approximately 0°C to approximately 25°C.

[0124] For example, an adhesive AB having a glass transition temperature of about 0°C to about 25°C can be prepared by mixing about 42 wt% to about 58 wt% of methyl methacrylate (MMA), about 37 wt% to about 53 wt% of butyl acrylate ((BA)), and about 4 wt% to about 6 wt% of hydroxyethyl methacrylate (2-HEMA), the weight ratio of the above materials being relative to the total weight of the adhesive AB.

[0125] Beaded UB can include elastic materials. For example, beaded UB can be polyurethane beads comprising polyurethane materials, but is not limited thereto. The average particle size of beaded UB can be from about 5 μm to about 10 μm, but is not limited thereto.

[0126] In step S11, when the adhesive AB is mixed with the beads UB, the beads UB can be distributed in the adhesive AB to prepare the coating composition CM. The concentration of the beads UB can be substantially the same for each region of the coating composition CM.

[0127] Reference Figure 3 , Figure 7 and Figure 9 After step S11, which involves preparing the coating composition by mixing the binder and beads, step S21, which involves coating the coating composition onto the substrate film, can be performed. In step S21, the coating composition CM can be coated to cover the entire surface of the substrate film 110. The beads UB can be irregularly coated onto the coating composition CM applied to the substrate film 110. Through a curing process performed later, the coating composition CM coated on the substrate film 110 can become a film coating 120 forming the first protective film 100.

[0128] After step S21 of coating the coating composition onto the substrate film, step S31 of coating a curing agent onto the substrate film coated with the coating composition can be performed.

[0129] In step S31, the curing agent can cure the adhesive AB contained in the coating composition CM. By curing the adhesive AB, the flowability of the coating composition CM can be reduced, and the adhesive AB and beads UB can be fixed to the substrate film 110 to prepare the film coating 120.

[0130] The curing agent may be a crosslinking agent that can bond to at least one of a variety of materials included in the adhesive AB. In one embodiment, the curing agent may include isocyanate groups (-N=C=O) that can form polyurethane bonds with hydroxyethyl methacrylate (2-HEMA) in the adhesive AB. For example, the curing agent may include hexamethylene diisocyanate trimer (HDI trimer), and the equivalent amount of hexamethylene diisocyanate trimer (HDI trimer) may be determined such that the ratio of the equivalent amount of hydroxyl groups (-OH) to the equivalent amount of isocyanate groups (-N=C=O) may be 1:1.

[0131] By performing step S31 of coating a curing agent onto a substrate film 110 coated with the coating composition CM, the coating composition CM can be cured to form a film coating 120. In other words, a first protective film 100 can be formed in which the film coating 120 can be formed on the substrate film 110.

[0132] The following sections will describe the film coating 120 in detail using preparation and testing examples (see [link to documentation]). Figure 3 ( ) anti-slip properties.

[0133] Preparation Examples 1 to 5: Preparation of Coating Compositions

[0134] <Preparation Example 1>

[0135] An acrylic adhesive with a glass transition temperature of approximately 50°C was prepared by mixing methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (2-HEMA) in a weight ratio of approximately 72:23:5, and then mixed with polyurethane beads to prepare a coating composition CM. The polyurethane beads were mixed in at a weight ratio of approximately 10 wt% relative to the total weight of the coating composition CM.

[0136] <Preparation Example 2>

[0137] An acrylic adhesive with a glass transition temperature of approximately 25°C was prepared by mixing methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (2-HEMA) in a weight ratio of approximately 58:37:5, and then mixed with polyurethane beads to prepare a coating composition CM. The polyurethane beads were mixed in at a weight ratio of approximately 10 wt% relative to the total weight of the coating composition CM.

[0138] <Preparation Example 3>

[0139] An acrylic adhesive with a glass transition temperature of approximately 0°C was prepared by mixing methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (2-HEMA) in a weight ratio of approximately 42:53:5, and then mixed with polyurethane beads to prepare a coating composition CM. The polyurethane beads were mixed in at a weight ratio of approximately 10 wt% relative to the total weight of the coating composition CM.

[0140] <Preparation Example 4>

[0141] An acrylic adhesive with a glass transition temperature of approximately -25°C was prepared by mixing methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (2-HEMA) in a weight ratio of approximately 22:73:5, and then mixed with polyurethane beads to prepare a coating composition CM. The polyurethane beads were mixed in at a weight ratio of approximately 10 wt% relative to the total weight of the coating composition CM.

[0142] <Preparation Example 5>

[0143] An acrylic adhesive with a glass transition temperature of approximately -50°C was prepared by mixing methyl methacrylate (MMA), butyl acrylate (BA), and hydroxyethyl methacrylate (2-HEMA) in a weight ratio of approximately 1:94:5, and then mixed with polyurethane beads to prepare a coating composition CM. The polyurethane beads were mixed at a weight ratio of approximately 10 wt% relative to the total weight of the coating composition CM.

[0144] <Test Example 1: Evaluation of the anti-slip performance of preparation examples 1 to 5>

[0145] Figure 10 An example test is schematically shown for evaluating the anti-slip performance of the film coating according to an embodiment.

[0146] Reference Figure 10 The display device 200, with a film coating 120 formed thereon and a tilt angle θ, was observed to determine whether slippage occurred. The film coating 120 was formed on the stage STG using coating compositions CM from Preparation Examples 1 to 5. Specifically, the coating compositions CM from Preparation Examples 1 to 5 were applied to the stage STG and cured with a curing agent comprising hexamethylene diisocyanate trimer (HDI trimer) to form the film coating 120. In this test example, the tilt angle θ was set to 45°. Table 1 below shows the results of evaluating whether slippage occurred in Preparation Examples 1 to 5.

[0147] [Table 1]

[0148]

[0149] When a film coating 120 is formed on a stage STG with an inclination angle of approximately 45° and the occurrence of slippage is evaluated, in Preparation Example 1 where the glass transition temperature of the acrylic adhesive can be approximately 50°C, the phenomenon that the coating composition might stick to the display device 200 does not occur, but the display device 200 slips.

[0150] When the film coating 120 is formed using Preparation Example 2, in which the glass transition temperature of the acrylic adhesive can be about 25°C, and Preparation Example 3, in which the glass transition temperature of the acrylic adhesive can be about 0°C, the display device 200 does not slide and there is no phenomenon that the coating composition may stick to the display device 200, thus exhibiting excellent anti-slip performance.

[0151] When the film coating 120 is formed using Preparation Example 4, in which the glass transition temperature of the acrylic adhesive can be about -25°C, and Preparation Example 5, in which the glass transition temperature of the acrylic adhesive can be about -50°C, the display device 200 does not slide, but the coating composition sticks to the display device 200.

[0152] Therefore, in order to exhibit excellent anti-slip properties and prevent the coating composition from sticking to the display device, it may be advantageous to use an acrylic adhesive with a glass transition temperature in the range of about 0°C to about 25°C.

[0153] In the following description, a tray assembly TA comprising an anti-slip mat 600 having the same function as the film coating 120 will be described. In the following embodiments, descriptions of the same components as those previously described will be omitted or simplified, and differences will be described.

[0154] Figure 11 This is a schematic exploded perspective view showing a tray assembly according to an embodiment. Figure 12 This is a schematic perspective view showing the state in which the target element is loaded onto the tray assembly according to an embodiment. Figure 13 It is along Figure 12 A schematic cross-sectional view of line XIII-XIII'.

[0155] Reference Figures 11 to 13 According to an embodiment, the tray assembly TA may include a tray 500 and an anti-slip mat 600 disposed on the tray 500. In an embodiment, the anti-slip mat 600 may be inserted into the tray 500 and may be detached from the tray 500.

[0156] The loading target element 1_1 can be mounted on the anti-slip pad 600 of the tray assembly TA. In an embodiment, the loading target element 1_1 can be associated with a reference... Figures 1 to 6The difference in the description of the loading target element 1 is that the film coating 120 can be omitted.

[0157] The loading target elements 1_1 can be positioned spaced apart from each other. Even if there are no boundaries, the anti-slip mat 600 can provide friction to the loading target elements 1_1 to prevent movement. Therefore, collisions between multiple loading target elements 1_1 or between the loading target elements 1_1 and the tray 500 can be prevented. In other words, when the loading target elements 1_1 are loaded onto the tray assembly TA and conveyed, the anti-slip mat 600 can provide friction to the loading target elements 1_1 to prevent movement and damage.

[0158] The bottom surface of the anti-slip mat 600 can contact the bottom surface portion 510 of the tray 500. Although the edge of the anti-slip mat 600 can contact the side wall portion 520 of the tray 500, this disclosure is not limited thereto, and the edge of the anti-slip mat 600 can be spaced apart from the side wall portion 520 of the tray 500.

[0159] According to one embodiment, the anti-slip mat 600 may include a substrate 610 and a pad coating 620 disposed on the surface of the substrate 610.

[0160] The matrix 610 may include a thermoplastic polymer resin. For example, the thermoplastic polymer resin may include, but is not limited to, polyester (PETA, PET G, PET G-PET A-PET G), styrene-butadiene copolymer (SBC), acrylonitrile-butadiene-styrene copolymer (ABS), polystyrene (PS), polyimide (PI), polyamide (PA), polysulfonate, polycarbonate (PC), polyacrylate (PAA), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), modified polyphenylene ether (M-PPO), blends or copolymers thereof, phenolic resins, epoxy resins, and polyurethane resins.

[0161] The pad coating 620 may include a pad adhesive 621 and pad beads 622 distributed in the pad adhesive 621.

[0162] The pad adhesive 621 can be configured to cover the entire surface of the substrate film 110. The pad adhesive 621 can surround the pad bead 622, which will be described later, and fix the pad bead 622 to the surface of the substrate 610. Since the description of the pad adhesive 621 and the pad bead 622 can be compared with that of the film adhesive 121 (see [link to description]), Figure 1 ) and membrane beads 122 (see Figure 1 The descriptions are essentially the same, so additional descriptions will be omitted.

[0163] According to one embodiment, the tray assembly TA may further include a pad adhesive layer 700 disposed between the tray 500 and the anti-slip mat 600. The pad adhesive layer 700 can adhere the anti-slip mat 600 to the tray 500.

[0164] According to the tray assembly TA of the embodiment, even if there may be no boundary, the pad coating 620 of the anti-slip mat 600 can provide friction to the loading target element 1_1 to prevent movement of the loading target element 1_1 due to its anti-slip properties. Therefore, collisions between multiple loading target elements 1_1 or between the loading target element 1_1 and the tray 500 can be prevented. In other words, when the loading target element 1_1 is loaded onto the tray 500 and conveyed, the pad coating 620 can provide friction to the loading target element 1_1 to prevent movement and damage to the loading target element 1_1.

[0165] Figure 14 This is a schematic exploded perspective view showing a tray assembly according to another embodiment. Figure 15 It is along Figure 14 A schematic cross-sectional view of the line XV-XV'.

[0166] Reference Figure 14 and Figure 15 The tray assembly TA_1 according to the embodiment may differ from the tray assembly TA according to one embodiment in that the tray assembly TA_1 may include an anti-slip mat 600_1, which is disposed only in the area where the target element 1_1 can be loaded. Figure 14 and Figure 15 The loaded target element 1_1 in the reference can be used with the reference. Figures 11 to 13 The loading target element 1_1 described is the same. The tray assembly TA_1 according to the embodiment may include a plurality of separate anti-slip pads 600_1. Although in Figure 14 The image shows six anti-slip mats 600_1 arranged in two rows and three columns, but the number and arrangement of the anti-slip mats 600_1 are not limited to this.

[0167] Each anti-slip mat 600_1 may include a substrate 610_1 and a pad coating 620_1 disposed on the substrate 610_1.

[0168] The pad coating 620_1 may include a pad adhesive 621_1 and pad beads 622_1 distributed in the pad adhesive 621_1.

[0169] The area of ​​each anti-slip pad 600_1 may be larger than the area of ​​the loading target element 1_1 loaded on the anti-slip pad 600_1, but not necessarily. The anti-slip pads 600_1 may have the same area. However, this disclosure is not limited thereto, and the anti-slip pads 600_1 may have different areas.

[0170] According to an embodiment, the tray assembly TA_1 may further include a tray 500 and a pad adhesive layer 700_1 disposed on an anti-slip mat 600_1. The pad adhesive layer 700_1 can bond the tray 500 and the anti-slip mat 600_1 to each other. The surface area of ​​the pad adhesive layer 700_1 may be equal to the surface area of ​​the anti-slip mat 600_1, but it is not necessarily so.

[0171] According to the tray assembly TA_1 according to the embodiment, the loading target element 1_1 can be stably loaded because the anti-slip pad 600_1 includes a pad coating 620_1 with a high coefficient of friction relative to the loading target element 1_1.

[0172] In the tray assembly TA_1 according to the embodiment, the anti-slip pad 600_1 can be provided only in the area where the loading target element 1_1 can be loaded, so that the anti-slip performance of the loading target element 1_1 can be exhibited by using a small number of anti-slip pads 600_1.

[0173] Figure 16 This is a schematic cross-sectional view of a tray assembly according to yet another embodiment.

[0174] Reference Figure 16 The tray assembly TA_2 according to an embodiment may differ from the tray assembly TA according to an embodiment in that the substrate 610 may be omitted and the pad coating 620_2 (including pad adhesive 621_2 and pad beads 622_2) may be directly disposed on the tray 500. In other words, the tray assembly TA_2 according to an embodiment may include the tray 500 and the pad coating 620_2 disposed on the tray 500.

[0175] According to an embodiment, the tray assembly TA_2 includes an anti-slip pad 600_2 (i.e., a pad coating 620_2) with a high coefficient of friction relative to the loading target element 1_1, thereby enabling stable loading of the loading target element 1_1 (see...). Figure 15 ).

[0176] According to the embodiment, the anti-slip pallet assembly TA_2 can be easily manufactured by directly applying the pad coating 620_2 to the pallet 500.

[0177] In summary, those skilled in the art will understand that many variations and modifications can be made to the embodiments without substantially departing from the principles of this disclosure. Therefore, the disclosed embodiments are for general and descriptive purposes only and not for limiting purposes.

Claims

1. A protective film, wherein, The protective film includes: Membrane; and A coating disposed on the membrane, wherein The coating comprises: Adhesives; and The beads disposed in the adhesive, and The adhesive comprises: The protruding portion that contacts each of the beads; and The flat portion that does not contact the bead The adhesive has a glass transition temperature of 0°C to 25°C and comprises methyl methacrylate, butyl acrylate, and hydroxyethyl methacrylate. Wherein, relative to the total weight of the adhesive, The methyl methacrylate has a weight ratio of 42 wt% to 58 wt%. The butyl acrylate has a weight ratio of 37 wt% to 53 wt%, and The hydroxyethyl methacrylate has a weight ratio of 4 wt% to 6 wt%.

2. The protective film of claim 1, wherein, The protruding portion is surrounded by the flat portion.

3. The protective film of claim 2, wherein, The thickness of the protruding portion is less than the thickness of the flat portion.

4. The protective film of claim 1, wherein, The average thickness of the adhesive is less than the average particle size of the beads.

5. The protective film of claim 4, wherein, The beads have an average particle size of 5 μm to 10 μm.

6. The protective film of claim 1, wherein, The beads include polyurethane beads.

7. The protective film of claim 6, wherein, The weight ratio of the beads to the coating is 9 wt% to 11 wt%.

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