Coated film, coating composition, and display device

Abstract

Provided are: a coated film including a base film and a coating layer provided on the base film, wherein the coating layer has a water contact angle of 100° or more and a water contact angle after scratching of 98° or more; and a display device including the coated film. Also provided is a coating composition for producing the coating layer.

Description

Technical Field

[0001] This disclosure relates to a coating film, a coating composition, and a display device. Background Technology

[0002] Translucent films are a core material for optical and flexible displays, and their importance is increasing. In particular, due to their light weight, processability, and flexibility, translucent films are being used as a substitute for glass in the display field. Generally, it is known that the surface hardness and abrasion resistance of translucent films are lower than that of glass. Therefore, in order to apply translucent films to the display field, research has been conducted to improve their abrasion resistance.

[0003] In methods for improving the mechanical or optical properties of a light-transmitting film, a coating can be applied to the surface of the film. A light-transmitting film with a coating is also called a "coating".

[0004] Meanwhile, touchscreen input has recently become widely used in electronic devices such as portable personal digital assistants. However, when information is directly input using a hand or pen on the surface of an electronic device or display, the surface may become contaminated.

[0005] Therefore, there is a need for a translucent film or coating that has excellent abrasion resistance, resistance to stains caused by hand or pen touch, or excellent stain removal performance. Summary of the Invention

[0006] Technical issues

[0007] Therefore, in view of the above problems, this disclosure was made, and one aspect of this disclosure is to provide a coating with excellent abrasion resistance and scratch resistance.

[0008] Another aspect of this disclosure is to provide a coating film with excellent antifouling properties. Yet another aspect of this disclosure is to provide a coating film having a large water contact angle that remains large even after scratching, and providing excellent stain resistance.

[0009] Another aspect of this disclosure is to provide a coating composition that can be used to manufacture a coating film having the aforementioned properties.

[0010] Another aspect of this disclosure is to provide a display device including the coating film.

[0011] Technical solution

[0012] According to one aspect of this disclosure, a coating film is provided, comprising a base film and a coating layer disposed on the base film, wherein the coating layer has a water contact angle of more than 100° and a water contact angle after scratching of more than 98°.

[0013] The difference between the water contact angle and the water contact angle after scraping can be less than 10°.

[0014] The coating may have a water contact angle of 100° to 120° and a water contact angle of 98° to 110° after scratching.

[0015] The number of scratches on the coating can be two or less.

[0016] The coating can have a water contact angle of over 95° after being abraded by an eraser.

[0017] The difference between the water contact angle and the water contact angle after the eraser is worn can be less than 10°.

[0018] The coating can have a water contact angle of 95° to 110° after rubber abrasion.

[0019] Based on the coating thickness of 10 μm, the coating can have a curl of less than 2 mm.

[0020] Based on the coating thickness of 10 μm, the coating can have a crack point radius (R) of less than 1 mm.

[0021] According to another aspect of this disclosure, a coating composition comprising a silane compound and a polymerization curing aid is provided, wherein the silane compound comprises a first silane compound represented by Formula 1 below, a second silane compound represented by Formula 2 below, and a third silane compound represented by Formula 3 below, and the polymerization curing aid comprises a diol and water (H2O).

[0022] <Formula 1>

[0023]

[0024] <Formula 2>

[0025]

[0026] <Formula 3>

[0027] Si(OR 3 )4

[0028] Among them, R 11 It is a substituted or unsubstituted C2-C5 unsaturated hydrocarbon group, R 12 R 13 and R 14 Each is independently a C1-C5 alkyl group, R 21 It is a single bond or a C1-C4 alkylene group, R 22 R 23 and R 24 Each is independently a C1-C5 alkyl group, m is an integer from 3 to 10, R3 It is a C1-C4 alkyl group.

[0029] The molar ratio of the silane compound to the polymerization curing aid can be in the range of 1:1.2 to 1:1.8.

[0030] Based on the total molar number of the silane compound, the silane compound may include 80 mol% to 90 mol% of a first silane compound, 1 mol% to 5 mol% of a second silane compound, and 7 mol% to 15 mol% of a third silane compound.

[0031] The first silane compound may include vinyltrimethoxysilane represented by Formula 4 below:

[0032] <Formula 4>

[0033]

[0034] The second silane compound may include at least one selected from 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane, 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, and 1H,1H,2H,2H-perfluorodecyltriethoxysilane.

[0035] The third silane compound may include at least one of tetraethyl orthosilicate (TEOS) and tetramethyl orthosilicate (TMOS).

[0036] The diol may include at least one of ethylene glycol, 1,3-propanediol, and 1,4-butanediol.

[0037] The coating composition may also contain an alkaline catalyst.

[0038] Based on 100 parts by weight of total silane compounds, the coating composition may contain 0.05 parts by weight to 0.1 parts by weight of an alkaline catalyst.

[0039] According to another aspect of this disclosure, a coating film is provided, comprising a base film and a coating layer formed on the base film using the coating composition.

[0040] According to another aspect of this disclosure, a display device is provided, including a display panel and a coating disposed on the display panel.

[0041] Beneficial effects

[0042] The coating according to one embodiment of this disclosure has perfluorinated groups, and therefore exhibits excellent abrasion resistance, scratch resistance and stain resistance.

[0043] According to one embodiment of this disclosure, the coating film including the coating layer can have a large water contact angle and a large water contact angle after scratching. Therefore, the coating film according to one embodiment of this disclosure can exhibit excellent sliding properties, stain resistance, and detergency.

[0044] According to one embodiment of this disclosure, a coating prepared from a coating composition comprising a polyfunctional silane compound exhibits excellent abrasion resistance and scratch resistance. A coating film including such a coating according to one embodiment of this disclosure exhibits excellent abrasion resistance and scratch resistance. Furthermore, the coating film according to one embodiment of this disclosure exhibits excellent flexibility.

[0045] A display device in which a coating is applied to the display surface of a display panel according to one embodiment of the present disclosure can exhibit excellent surface contamination prevention and removal performance, excellent abrasion and scratch resistance, and excellent flexibility. Attached Figure Description

[0046] Figure 1 This is a schematic cross-sectional view showing a coating according to one embodiment of the present disclosure.

[0047] Figure 2 It is a schematic cross-sectional view showing the measurement of the water contact angle.

[0048] Figure 3 It is a schematic cross-sectional view showing the measurement of curling.

[0049] Figure 4 This is a schematic diagram illustrating the process of measuring the radius (R) of a crack point.

[0050] Figure 5 This is a cross-sectional view of a portion of a display device according to an exemplary embodiment.

[0051] Figure 6 yes Figure 5 An enlarged sectional view of the "P" section. Detailed Implementation

[0052] The embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. However, the following embodiments are provided illustratively only for the purpose of clearly understanding this disclosure and do not limit the scope of this disclosure.

[0053] Where terms such as “comprising,” “having,” or “including” are used in this specification, another part may also exist unless “only” is also used. Singular terms may include plural meanings unless otherwise stated. Furthermore, in interpreting an element, even without explicit description, the element will be understood to include a range of errors.

[0054] When describing positional relationships, for example, when using "on," "above," "below," or "next to," situations where there is no contact between them can be included unless "immediately" or "directly" is used.

[0055] When describing temporal relationships, such as when using "after," "following," "next," or "before" to describe chronological order, non-continuous relationships may be included unless "immediately" or "directly" is used.

[0056] It should be understood that although the terms "first," "second," etc., can be used in the text to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one element from another. Therefore, in the technical concept of this disclosure, the first element can be referred to as the second element.

[0057] It should be understood that the term "at least one" includes all combinations relating to one or more items. For example, "at least one of the first element, the second element, and the third element" can include all combinations of two or more elements selected from the first, second, and third elements, as well as each of the first, second, and third elements.

[0058] Features of the various embodiments of this disclosure can be partially or completely integrated or combined with each other, and can interoperate in various ways and be technically driven. Embodiments of this disclosure can be carried out independently of each other, or they can be carried out together in an interconnected manner.

[0059] Figure 1 This is a schematic cross-sectional view of a coating (100) according to one embodiment of the present disclosure.

[0060] Reference Figure 1 According to one embodiment of the present disclosure, the coating (100) includes a base film (110) and a coating layer (120) disposed on the base film (110).

[0061] A light-transmitting film can be used as a base film (110). A polyimide (PI) base film comprising a polyimide film and a polyamide-imide film can be used as a light-transmitting film. However, one embodiment of this disclosure is not limited thereto, and polycarbonate (PC) films, polyacrylic acid films, polyethylene terephthalate films, cellulose films, etc., can be used as base films (110).

[0062] According to one embodiment of this disclosure, the coating (120) can be formed using a coating composition comprising a silane compound and a polymerization curing aid. The coating (120) formed from the coating composition comprising a silane compound and a polymerization curing aid may comprise a siloxane resin.

[0063] According to one embodiment of this disclosure, a perfluorosilane compound can be used to form a coating (120). Perfluorinated groups contained in the perfluorosilane compound can be disposed on the coating. Therefore, the perfluorinated groups can affect the physical properties of the surface of the coating (120).

[0064] According to one embodiment of this disclosure, the coating (120) can have excellent abrasion resistance, scratch resistance, stain resistance and flexibility. Therefore, the coating film (100) including the coating (120) can exhibit excellent abrasion resistance, scratch resistance, stain resistance and flexibility.

[0065] According to one embodiment of this disclosure, the thickness of the coating (120) can be from 5 μm to 50 μm. When the thickness of the coating (120) is less than 5 μm, the abrasion resistance, scratch resistance, and stain resistance of the coating film 100 may not be fully utilized. When the thickness of the coating (120) exceeds 50 μm, the thickness of the coating film (100) may increase, and the flexibility of the coating film (100) may deteriorate.

[0066] According to one embodiment of the present disclosure, the coating (100) may have a water contact angle of 100° or more and a water contact angle after scratching of 98° or more. More specifically, the coating layer (120) of the coating (100) according to one embodiment of the present disclosure may have a water contact angle of 100° or more and a water contact angle after scratching of 98° or more.

[0067] According to one embodiment of this disclosure, the water contact angle is defined as the angle between the surface of the coating (120) and the boundary of the water droplet (H2O), measured after a 5 μL droplet of water (H2O) is dropped onto the coating (120).

[0068] Figure 2 It is a schematic cross-sectional view showing the measurement of the water contact angle.

[0069] According to one embodiment of this disclosure, such as Figure 2 As shown, using a KRUSS GmbH MSA (Mobile Surface Analyzer), a 5 μL droplet of water (WD) was dropped onto the coating (120), and the angle (θ) between the surface of the coating (120) and the boundary of the water droplet was measured to obtain the water contact angle. Specifically, a 5 μL droplet of water (WD) was dropped onto the surface of the coating (120) at a rate of 2.7 μL / sec, and the angle θ between the surface of the coating (120) and the boundary of the water droplet (WD) was measured 7 times at 0.2-second intervals. This measurement was repeated 5 times, and the average of the 5 measurements was set as the water contact angle.

[0070] According to one embodiment of the present disclosure, the coating (120) of the film (100) has a water contact angle of 100° or more. A coating (120) with a water contact angle of 100° or more can exhibit excellent sliding properties. When the coating (120) has excellent sliding properties, stains (contaminants) are less likely to adhere to or adhere to the coating (120), thus imparting excellent stain resistance to the coating (120). Furthermore, when the coating (120) has excellent sliding properties, contaminants adhering to or deposited on the coating (120) can be easily removed from the coating (120). Therefore, the coating (120) can exhibit excellent contaminant removal performance.

[0071] According to one embodiment of the present disclosure, the coating (120) of the film (100) has a water contact angle of more than 98° after scratching.

[0072] The coating (100) was cut into 100mm×50mm sizes to obtain a coating sample. The coating sample was fixed on a flat surface with the coating (120) facing upwards using tape (3M). A 20mm×20mm stainless steel (SUS) clamp covered with #0000 (LIBERON) nonwoven fabric was moved back and forth 10,000 times on the surface of the coating (120) of the coating sample under a load of 0.5kgf and a speed of 45RPM to obtain the water contact angle after scratching.

[0073] In summary, the water contact angle after scratching refers to the water contact angle measured after a scratch is formed on the surface of the coating (120) of the coating film (100). The MSA (Mobile Surface Analyzer) from KRUSS GmbH can be used to measure the water contact angle after scratching.

[0074] Because the coating (120) of the coating (100) according to one embodiment of the present disclosure has a water contact angle of 98° or more after scratching, the surface of the coating (120) exhibits excellent sliding properties even after exposure to a scratching environment. Therefore, even when the coating (120) is exposed to a scratching environment during use of the coating (100), the coating (100) exhibits excellent contaminant prevention and removal performance.

[0075] According to one embodiment of this disclosure, the difference between the water contact angle of the coating (120) and the water contact angle after the coating (120) is scratched can be less than 10°.

[0076] The slight difference between the water contact angle of the coating (120) and the water contact angle of the coating (120) after scratching indicates that even when the coating (120) is exposed to a scratching environment during use, the water contact angle of the coating (120) does not decrease significantly. Therefore, the coating (100) according to one embodiment of the present disclosure is not damaged in a scratching environment and thus has high resistance to scratching. Therefore, the coating (100) according to one embodiment of the present disclosure has excellent scratch resistance.

[0077] According to one embodiment of this disclosure, the coating (120) may have a water contact angle of 100° to 120° and a water contact angle after scratching of 98° to 110°. Alternatively, according to one embodiment of this disclosure, the coating (120) may have a water contact angle of 105° to 120° and a water contact angle after scratching of 100° to 110°. According to one embodiment of this disclosure, the coating (120) may have a water contact angle of 105° to 115°.

[0078] The number of scratches on the coating (120) of the coating film (100) according to one embodiment of the present disclosure may be two or less.

[0079] According to one embodiment of this disclosure, a coating sample is obtained by cutting the coating (100) into a size of 100mm × 50mm. The coating sample is fixed to a flat surface with the coating (120) facing upwards using tape (3M). A 20mm × 20mm stainless steel (SUS) clamp covered with #0000 (LIBERON) nonwoven fabric is moved back and forth 10,000 times on the surface of the coating (120) of the coating sample under a load of 0.5kgf and a speed of 45RPM. The number of scratches is obtained by counting the number of scratches with the naked eye.

[0080] According to one embodiment of this disclosure, the coating (120) of the film (100) may have one or more scratches, or may have no scratches.

[0081] According to one embodiment of this disclosure, even if the coating (100) undergoes a scratch-inducing process, little or no scratches are formed. Therefore, the coating (100) according to one embodiment of this disclosure has excellent scratch resistance.

[0082] When the coating (100) according to one embodiment of the present disclosure is used as a cover window of a display device, the coating (100) is exposed to a scratching environment. Since the coating (100) according to one embodiment of the present disclosure has excellent scratch resistance, scratches are hardly formed even when the coating (100) is used as a cover window of a display device.

[0083] According to one embodiment of this disclosure, the coating (120) of the coating film (100) can have a water contact angle of more than 95° after rubber abrasion.

[0084] The water contact angle after eraser wear is measured by cutting a coating (100) into 200mm × 50mm pieces to obtain a coating sample, fixing the sample on a flat surface with the coating (120) facing upwards using tape (3M), fixing a Manaslu eraser to a fixture, and reciprocating the fixture on the surface of the coating (120) of the coating sample 1,000 times under a load of 0.5kgf and a speed of 45RPM. The MSA (Mobile Surface Analyzer) from KRUSS GmbH can be used to measure the water contact angle after eraser wear.

[0085] Even after exposure to a scratching environment, the coating (120) is not severely damaged because the coating (120) of the film (100) according to one embodiment of the present disclosure has a water contact angle of more than 95° after rubber abrasion. Therefore, the coating (100) according to one embodiment of the present disclosure can exhibit excellent abrasion resistance.

[0086] According to one embodiment of this disclosure, the difference between the water contact angle of the coating (120) and the water contact angle after the coating (120) is worn by an eraser can be less than 10°.

[0087] The slight difference between the water contact angle of the coating (120) and the water contact angle of the coating (120) after being abraded by an eraser indicates that the water contact angle of the coating (120) is not significantly reduced even when the coating (120) is exposed to a scratching environment during use. Therefore, the coating (100) according to one embodiment of the present disclosure is not severely damaged in a scratching environment and thus exhibits excellent abrasion resistance.

[0088] According to one embodiment of this disclosure, the coating (120) may have a water contact angle of 95° to 110° after rubber abrasion. Alternatively, according to one embodiment of this disclosure, the coating (120) may have a water contact angle of 95° to 105° after rubber abrasion.

[0089] According to one embodiment of this disclosure, the coating (100) can have a curl of less than 2 mm. For example, based on a coating (120) thickness of 10 μm, the coating (100) can have a curl of less than 2 mm.

[0090] Curl is defined as the distance between the edge of a coating (100) cut into a square of size 100mm×100mm and placed on a flat glass substrate and the bottom of the glass substrate.

[0091] Figure 3 It is a schematic cross-sectional view showing the measurement of curl. Figure 3 The distance referred to as “curl” is specifically the distance between the edge of the coating (100) sample and the bottom of the glass substrate (201).

[0092] During the manufacturing of the coating (100), the coating composition can be cured to form a coating (120), and curling may occur due to curing shrinkage. When curling occurs, post-processing is difficult due to the deformed appearance of the coating (100), and when curling is severe, problems such as coating (120) peeling may occur.

[0093] According to one embodiment of the present disclosure, the coating composition may contain a diol, which can maintain the distance between molecules contained in the coating composition, thereby preventing the film (100) including the coating layer (120) from curling.

[0094] According to one embodiment of this disclosure, the coating (100) may have a curl of less than 1 mm, may have a curl of less than 0.5 mm, and may not have a curl that can be seen by the naked eye.

[0095] According to one embodiment of this disclosure, the coating (100) may have a crack point radius (R) of less than 1 mm. For example, based on a coating (120) thickness of 10 μm, the coating (100) may have a crack point radius (R) of less than 1 mm.

[0096] According to one embodiment of this disclosure, a coating sample is prepared by cutting the coating (100) into a size of 20 mm × 100 mm, and the coating sample is mounted on a radius bending tester such that the coating (120) faces away from the bent coating sample. While bending the coating sample by reducing the radius of curvature, the radius of curvature when a crack appears in the coating sample is measured to obtain the crack point radius (R).

[0097] Figure 4 This is a schematic diagram illustrating the measurement of the radius (R) of a crack point in granular material. For example... Figure 4 As shown, the sample of the coating (100) is bent, and the bending operation is repeated while reducing the radius of curvature at the bending point. The radius of curvature measured when a crack appears in the sample of the coating (100) is defined as the "crack point radius (R)".

[0098] According to one embodiment of this disclosure, the coating (100) has a very small crack point radius (R) of less than 1 mm, thus exhibiting excellent bendability and flexibility.

[0099] In particular, according to one embodiment of this disclosure, since the coating sample is mounted on a radius bending tester such that the coating (120) faces away from the bent coating sample, the crack point radius (R) is measured under more severe conditions than when the coating (120) faces away from the bent coating sample. However, the coating (100) according to one embodiment of this disclosure has excellent bendability and flexibility because the coating (100) according to one embodiment of this disclosure has a very small crack point radius (R) of less than 1 mm.

[0100] More specifically, the coating (100) according to one embodiment of this disclosure may have a crack point radius (R) of less than 0.5 mm.

[0101] Another aspect of this disclosure provides a coating composition. The coating composition can be used to form a coating (120) of a film (100).

[0102] According to one embodiment of this disclosure, the coating composition comprises a silane compound and a polymerization curing aid. The silane compound may include a first silane compound represented by Formula 1 below, a second silane compound represented by Formula 2 below, and a third silane compound represented by Formula 3 below. The polymerization curing aid may comprise a diol and water (H2O).

[0103] <Formula 1>

[0104]

[0105] Among them, R 11 It is a substituted or unsubstituted C2-C5 unsaturated hydrocarbon group, R 12 R 13 and R 14 Each is independently a C1-C5 alkyl group. Here, the unsaturated hydrocarbon group and the alkyl group can be straight-chain, branched, or alicyclic, respectively.

[0106] <Formula 2>

[0107]

[0108] Among them, R 21 It is a single bond or a C1-C4 alkylene group, R 22 R 23 and R 24 Each is independently a C1-C5 alkyl group, wherein the alkylene group and the alkyl group are each straight-chain, branched, or alicyclic groups, and m is an integer from 3 to 10.

[0109] <Formula 3>

[0110] Si(OR 3 )4

[0111] Among them, R 3 It is a C1-C4 alkyl group, wherein the alkyl group is a straight-chain, straight-chain or alicyclic group.

[0112] According to one embodiment of this disclosure, a silane compound can be used to form a siloxane. Specifically, the silane compound undergoes a polymerization and curing reaction. Based on the polymerization and curing of the silane compound, a coating (120) can be formed by the polymerization and curing of the coating composition.

[0113] The first silane compound represented by Formula 1 may have unsaturated hydrocarbon groups and can undergo polymerization. The first silane compound is the main component of the silane compound and plays a key role in the polymerization and curing of the coating composition. The coating composition can be smoothly polymerized and cured by the first silane compound.

[0114] The first silane compound may include, for example, vinyltrimethoxysilane represented by Formula 4 below.

[0115] <Formula 4>

[0116]

[0117] The second silane compound is a silane compound containing a perfluorinated group. The perfluorinated group contained in the second silane compound can reduce the surface tension of the coating (120) to increase the water contact angle of the coating (120) and maintain an excellent contact angle after scratching or abrasion.

[0118] According to one embodiment of this disclosure, the coating (120) has a large water contact angle to provide excellent sliding properties and improves the contaminant prevention and removal performance of the coating (120), as well as scratch resistance. For this purpose, the coating composition may contain a second silane compound represented by Formula 2.

[0119] The second silane compound represented by Formula 2 may include at least one selected from 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane, 1H,1H,2H,2H-perfluorodecyltrimethoxysilane and 1H,1H,2H,2H-perfluorodecyltriethoxysilane.

[0120] The coating (120) formed using a coating composition containing a second silane compound having a perfluorinated group can have a water contact angle of 100° or more and a water contact angle after scratching of 98° or more. Furthermore, the coating (120) formed using a coating composition containing a second silane compound having a perfluorinated group can have a water contact angle after rubber abrasion of 95° or more.

[0121] According to one embodiment of this disclosure, the coating (120) with a large water contact angle can have excellent sliding properties, thereby improving contamination prevention and removal performance. Furthermore, the excellent sliding properties of the coating (120) prevent scratching in abrasive environments. Therefore, the scratch resistance of the coating (120) can be improved. Additionally, the abrasion resistance of the coating (120) can be improved by incorporating fluorine (F) in the second silane compound.

[0122] Because the coating (120) prepared by the coating composition according to one embodiment of the present disclosure has a water contact angle of more than 98° after scratching, it exhibits excellent sliding properties even after the surface of the coating (120) has been exposed to a scratching environment. Therefore, the contamination prevention and removal properties of the coating (120) can be maintained even after the coating (120) has been exposed to a scratching environment.

[0123] The coating (120) produced using a coating composition according to one embodiment of the present disclosure has fewer than two scratches after exposure to a scratching environment. Thus, the coating (120) is able to effectively resist scratching environments and exhibits excellent scratch resistance.

[0124] Because the coating (120) produced using the coating composition according to one embodiment of the present disclosure has a water contact angle of more than 95° after rubber abrasion, it can exhibit excellent sliding properties even when the coating (120) is exposed to an abrasive environment. Therefore, the coating (120) maintains excellent contamination prevention and removal properties even in abrasive environments.

[0125] Examples of second silane compounds include 1H,1H,2H,2H-perfluorooctyltriethoxysilane represented by Formula 5 and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane represented by Formula 6.

[0126] <Formula 5>

[0127]

[0128] <Formula 6>

[0129]

[0130] A coating composition according to one embodiment of the present disclosure may contain a third silane compound represented by formula 3 in order to improve the mechanical strength, hardness and scratch resistance of the coating (120).

[0131] According to one embodiment of this disclosure, the third silane compound has four alkoxy groups. As shown in Formula 3, a silane compound having four alkoxy groups is also referred to as a "silane compound having a Q structure".

[0132] The coating (120) formed using a coating composition comprising a third silane compound according to one embodiment of the present disclosure comprises a siloxane structure having a Q structure formed in the polymer chain of a siloxane resin, and therefore the coating (120) exhibits excellent hardness and scratch resistance comparable to glass.

[0133] The third silane compound may include, for example, at least one of tetraethyl orthosilicate (TEOS) and tetramethyl orthosilicate (TMOS).

[0134] The third silane compound is, for example, tetraethyl orthosilicate (TEOS) represented by Formula 7 below.

[0135] <Formula 7>

[0136]

[0137] According to one embodiment of this disclosure, the contents of the first silane compound, the second silane compound, and the third silane compound are increased to improve the abrasion resistance, scratch resistance, and water contact angle of the coating (120) formed using the coating composition.

[0138] For example, when the content of the first silane compound contained in the coating composition is insufficient, the coatability and curability of the coating composition may deteriorate, and the thermal curing time may increase significantly. Additionally, when the content of the first silane compound is insufficient, the scratch resistance of the coating may deteriorate.

[0139] When the content of the second silane compound in the coating composition is insufficient, the water contact angle of the coating formed using the coating composition may decrease, and the sliding performance may deteriorate. Conversely, when the content of the second silane compound is too high, processability and coatability may deteriorate.

[0140] The third silane compound is used to shorten the polymerization time of the coating composition and improve the abrasion resistance and scratch resistance of the coating (120). However, as the content of the third silane compound increases, the curling of the coating (120) increases, and the flexibility and bendability of the coating (120) deteriorate. Specifically, when the content of the third silane compound in the coating composition is too high, the flexibility of the coating (120) formed using the coating composition may deteriorate. Conversely, when the content of the third silane compound is insufficient, silane Q structures are not sufficiently formed in the polymer chain of the siloxane resin, thus the hardness, strength, and scratch resistance of the coating formed using the coating composition may deteriorate.

[0141] In view of these characteristics, according to one embodiment of the present disclosure, the coating composition may contain 80 mol% to 90 mol% of a first silane compound, 1 mol% to 5 mol% of a second silane compound and 7 mol% to 15 mol% of a third silane compound, based on the total molar number of silane compounds.

[0142] More specifically, according to one embodiment of this disclosure, the coating composition may comprise 82 mol% to 89 mol% of a first silane compound, 1 mol% to 5 mol% of a second silane compound, and 8 mol% to 12 mol% of a third silane compound, based on the total molar number of the silane compounds.

[0143] The solvent mixes the silane compounds uniformly, allowing them to polymerize easily.

[0144] According to one embodiment of this disclosure, the amount of the polymerization curing aid can be greater than that of the silane compound, based on molar ratio. For example, to ensure smooth mixing and polymerization of the silane compound, the molar ratio of the silane compound to the polymerization curing aid can be in the range of 1:1.2 to 1:1.8 (silane compound: polymerization curing aid = 1:1.2 to 1:1.8). More specifically, the molar ratio of the silane compound to the polymerization curing aid can be in the range of 1:1.4 to 1:1.6 (silane compound: polymerization curing aid = 1:1.4 to 1:1.6).

[0145] According to one embodiment of this disclosure, the amount of silane compound can be greater than that of the polymerization curing aid, based on the weight of the silane compound and the polymerization curing agent. For example, in order to form a coating (120) with excellent physical properties, the weight ratio of the polymerization curing aid to the silane compound can be in the range of 1:3 to 1:6 (polymerization curing aid: silane compound = 1:3 to 1:6).

[0146] A coating composition according to one embodiment of this disclosure comprises water (H2O) as a polymerization curing aid. Water (H2O) can act as a binder between monomers forming a siloxane resin and participates in dehydration condensation.

[0147] A coating composition according to one embodiment of the present disclosure may contain a diol as a polymerization curing aid. The diol is used to maintain the distance between the silane compounds during the curing process of the coating composition and to prevent the coating (120) or film (100) from curling due to the curing of the silane compounds. According to one embodiment of the present disclosure, a linear diol may be used to maintain the spacing between the silane compounds.

[0148] According to one embodiment of this disclosure, the diol may include, for example, at least one of ethylene glycol, 1,3-propanediol, and 1,4-butanediol.

[0149] The diol is used to suppress curling and increase the flexibility of the coating (120). However, when the content of the diol increases, the polymerization time of the coating composition may increase, and the abrasion resistance and scratch resistance of the coating (120) may deteriorate. Taking these properties into account, the content of water (H2O) and diol can be adjusted.

[0150] For example, based on molar ratios, water (H2O) and diol can be used in a ratio of 1:0.5 to 1:0.9 (water:diol = 1:0.5 to 1:0.9). More specifically, the molar ratio of water (H2O) to diol can be in the range of 1:0.6 to 1:0.8 (water:diol = 1:0.6 to 1:0.8).

[0151] According to one embodiment of this disclosure, the amount of diol used can be greater than that of water (H2O) on a weight basis. For example, water (H2O) and diol can be used in a weight ratio of 1:1.5 to 1:3 (water:diol = 1:1.5 to 1:3). More specifically, the weight ratio of water (H2O) to diol can be in the range of 1:1.5 to 1:2.5 (water:diol = 1:1.5 to 1:2.5).

[0152] The coating composition according to one embodiment of this disclosure may contain a catalyst. For example, the catalyst may promote the formation of the siloxane resin required to form the coating (120).

[0153] According to one embodiment of this disclosure, the catalyst can be an acid catalyst such as hydrochloric acid, acetic acid, hydrofluoric acid, nitric acid, sulfuric acid, or iodic acid; a basic catalyst such as ammonia, potassium hydroxide, sodium hydroxide, barium hydroxide, or imidazole; or an ion exchange resin such as AmberLite. These catalysts can be used alone or in combination of two or more catalysts. Based on 100 parts by weight of the siloxane compound, the catalyst can be added in amounts from 0.0001 parts by weight to about 10 parts by weight, but the amount of catalyst is not limited thereto.

[0154] A coating composition according to one embodiment of this disclosure may contain an alkaline catalyst. The alkaline catalyst may be sodium hydroxide (NaOH). Based on the total weight of 100 parts by weight of the silane compound, the coating composition may contain 0.05 parts by weight to 0.1 parts by weight of the alkaline catalyst.

[0155] The coating composition according to one embodiment of the present disclosure may further include at least one additive selected from polymerization initiators, antioxidants, leveling agents and coating aids.

[0156] According to one embodiment of this disclosure, the polymerization initiator is, for example, a photopolymerization initiator such as an organometallic salt or a thermal polymerization initiator such as an amine or imidazole. Based on 100 parts by weight of the siloxane resin, the amount of polymerization initiator can be from about 0.01 parts by weight to 2 parts by weight.

[0157] According to one embodiment, an organic solvent can be used to form a coating (120). The viscosity of the coating composition can be controlled by the organic solvent, thus the processability of the coating composition can be controlled, and the thickness of the coating (120) can be easily adjusted.

[0158] Organic solvents may include at least one selected from the following: ketones including acetone, methyl ethyl ketone, methyl butyl ketone, and cyclohexanone; cellosols including methyl cellosol and butyl cellosol; ethers including diethyl ether and dioxane; alcohols including isobutanol, isopropanol, butanol, and methanol; halogenated hydrocarbons including dichloromethane, chloroform, and trichloroethylene; and hydrocarbons including n-hexane, benzene, and toluene.

[0159] According to one embodiment of this disclosure, the coating (120) can be formed by polymerization and curing of the coating composition.

[0160] More specifically, a prepolymerized coating composition is used to form a paste-like prepolymer, and an organic solvent is added to the prepolymer to prepare a viscosity-controlled paste-like coating composition. The coating composition is then used to coat a base film (110), and the film is cured and polymerized to form a coating layer (120).

[0161] In the process of forming the coating (120), a coating composition can be used to form a siloxane resin. For example, the siloxane resin can be formed by substitution and condensation polymerization of alkoxydiols. During the formation of the siloxane resin, a substitution reaction (or hydrolysis) or a condensation reaction may occur between the alkoxy group and water. The reaction can be carried out at room temperature, but stirring can be carried out at 50°C to 120°C for 1 to 20 hours to promote the reaction.

[0162] According to one embodiment of the present disclosure, a coating composition according to one embodiment of the present disclosure is applied and molded onto a base film (110) using methods such as coating, casting or molding, and then photopolymerized or thermally polymerized to form a coating (120).

[0163] When the coating composition polymerizes, the suitable light dose for photopolymerization is 50 mJ / cm. 2 Above 20,000 mJ / cm 2 The heat treatment is then performed at a temperature above 40°C and below approximately 200°C to obtain a uniform surface before light irradiation. Furthermore, the suitable temperature for thermal polymerization is above 40°C and below 200°C, but the temperature is not limited to this.

[0164] Figure 5 This is a cross-sectional view showing a portion of a display device (200) according to another embodiment. Figure 6 yes Figure 5 Enlarged sectional view of "P" in the middle.

[0165] Reference Figure 5 According to another embodiment of the present disclosure, the display device (200) includes a display panel (501) and a coating (100) on the display panel (501). Figure 5 Showing included Figure 1 A display device (200) with a coating (100).

[0166] Reference Figure 5 and Figure 6 The display panel (501) includes a substrate (510), a thin-film transistor (TFT) on the substrate (510), and an organic light-emitting device (570) connected to the thin-film transistor (TFT). The organic light-emitting device (570) includes a first electrode (571), an organic light-emitting layer (572) on the first electrode (571), and a second electrode (573) on the organic light-emitting layer (572). Figure 5 and Figure 6 The display device (200) shown is an organic light-emitting display device.

[0167] The substrate (510) can be formed of glass or plastic. Specifically, the substrate (510) can be formed of plastic, such as polymer resin or optical film.

[0168] Although not shown, the buffer layer may be disposed on the base (510).

[0169] A thin-film transistor (TFT) is disposed on a substrate (510). The thin-film transistor (TFT) includes a semiconductor layer (520), a gate electrode (530) that is insulated from and at least partially overlaps the semiconductor layer (520), a source electrode (541) connected to the semiconductor layer (520), and a drain electrode (542) that is spaced apart from the source electrode (541) and connected to the semiconductor layer (520).

[0170] Reference Figure 6 A gate insulating layer (535) is disposed between the gate electrode (530) and the semiconductor layer (520). An interlayer insulating layer (551) may be disposed on the gate electrode (530), and a source electrode (541) and a drain electrode (542) may be disposed on the interlayer insulating layer (551).

[0171] A planarization layer (552) is disposed on the thin-film transistor (TFT) to planarize the top of the thin-film transistor (TFT).

[0172] The first electrode (571) is disposed on the planarization layer (552). The first electrode (571) is connected to the thin film transistor (TFT) through a contact hole disposed in the planarization layer (552).

[0173] A bank layer (580) is disposed on a planarization layer (552) in a portion of the first electrode (571) to define a pixel region or a light-emitting region. For example, the bank layer (580) is disposed in a matrix at the boundaries between multiple pixels to define the corresponding pixel regions.

[0174] An organic light-emitting layer (572) is disposed on the first electrode (571). The organic light-emitting layer (572) may also be disposed on the diaphragm layer (580). The organic light-emitting layer (572) may include a single light-emitting layer or two light-emitting layers stacked in a vertical direction. Light of any color among red, green, and blue may be emitted from the organic light-emitting layer (572), and white light may also be emitted from the organic light-emitting layer (572).

[0175] The second electrode (573) is disposed on the organic light-emitting layer (572).

[0176] The first electrode (571), the organic light-emitting layer (572), and the second electrode (573) can be stacked to form an organic light-emitting device (570).

[0177] Although not shown, when the organic light-emitting layer (572) emits white light, each pixel may include a color filter for filtering the white light emitted from the organic light-emitting layer (572) based on a specific wavelength. The color filter is formed in the optical path.

[0178] A thin-film encapsulation layer (590) may be disposed on the second electrode (573). The thin-film encapsulation layer (590) may include at least one organic layer and at least one inorganic layer, and the at least one organic layer and at least one inorganic layer may be disposed alternately.

[0179] A coating (100) is applied to a display panel (501) having the above-described stacked structure. The coating (100) can be used as a cover window to cover and protect the light-emitting surface of the display panel (501).

[0180] The present disclosure will be described in more detail below with reference to exemplary examples and comparative examples. However, the following embodiments and comparative examples should not be construed as limiting the scope of the present disclosure.

[0181] <Comparative Example 1>

[0182] 148 g (1 mol) of vinyltrimethoxysilane (Shin-Etsu Silicone Co., Ltd., KBM-1003), 27 g (1.5 mol) of water (H2O) and 0.1 g of NaOH (Samjeon Chemical Co., Ltd.) were added to a 500 mL flask and stirred at 100 rpm for 5 hours at 65 °C using a mechanical stirrer to prepare the prepolymer.

[0183] 10 g of the prepared prepolymer was mixed with 10 g of methyl ethyl ketone (MEK) as an organic solvent and 0.1 g of IRGACURE 184 (BASF) as a photoinitiator to prepare a paste-like coating composition. The paste-like coating composition was then coated onto a polyimide film with a thickness of 50 μm. On KOLON Corporation, as a base film (110), a coating (120) was formed using an 8-type coating rod (Mayer rod). As a result, an uncured coating film was prepared.

[0184] The uncured coating was dried in an oven at 100°C for 10 minutes and then exposed to UV light (150mW / cm²). 2 2J / cm 2 The coating was left to cure for 30 seconds to obtain a cured coating (120). As a result, a coating film (100) with a thickness of 10 μm was completed.

[0185] <Comparative Example 2>

[0186] Except for adding 148 g (1 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 19 g (1.05 mol) of water (H2O), 28 g (0.45 mol) of ethylene glycol (EG, Sigma Aldrich) and 0.1 g of NaOH (Samjeon Chemical Co., Ltd.) to a 500 mL flask and stirring at 65 °C for 7 hours to prepare a prepolymer (H2O:EG = 7:3 molar ratio), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0187] <Comparative Example 3>

[0188] Except for adding 148 g (1 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 16 g (0.9 mol) of water (H2O), 37 g (0.6 mol) of ethylene glycol (EG, Sigma Aldrich) and 0.1 g of NaOH (Samjeon Chemical Co., Ltd.) to a 500 mL flask and stirring at 65 °C for 10 hours to prepare a prepolymer (H2O:EG = 6:4 molar ratio), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0189] <Comparative Example 4>

[0190] Except that 148 g (1 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 14 g (0.75 mol) of water (H2O), 47 g (0.75 mol) of ethylene glycol (EG, Sigma Aldrich) and 0.1 g of NaOH (Samjeon Chemical Co., Ltd.) were added to a 500 mL flask, and the mixture was stirred at 65 °C for 12 hours to prepare a prepolymer (H2O:EG = 5:5 molar ratio), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0191] <Comparative Example 5>

[0192] Except that 148 g (1 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 11 g (0.6 mol) of water (H2O), 56 g (0.9 mol) of ethylene glycol (EG, Sigma Aldrich) and 0.1 g of NaOH (Samjeon Chemical Co., Ltd.) were added to a 500 mL flask, and the mixture was stirred at 65 °C for 24 hours to prepare a prepolymer (H2O:EG = 4:6 molar ratio), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0193] <Comparative Example 6>

[0194] Except for adding 147 g (0.99 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 2 g (0.01 mol) of TEOS (Evonik Industries AG), 16 g (0.9 mol) of water (H2O), 37 g (0.6 mol) of ethylene glycol (EG, Sigma Aldrich) and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 9 hours to prepare a prepolymer (molar ratio of KBM-1003:TEOS = 99:1, H2O:EG = 6:4), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0195] <Comparative Example 7>

[0196] Except for adding 141 g (0.95 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 10 g (0.05 mol) of TEOS (Evonik Industries AG), 16 g (0.915 mol) of water (H2O), 38 g (0.61 mol) of ethylene glycol (EG, Sigma Aldrich) and 0.1 g of NaOH (Samjeon Chemical Co., Ltd.) to a 500 mL flask, and stirring at 65 °C for 8 hours to prepare a prepolymer (molar ratio of KBM-1003:TEOS = 95:5, H2O:EG = 6:4), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0197] <Comparative Example 8>

[0198] Except for adding 133 g (0.9 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 21 g (0.1 mol) of TEOS (Evonik Industries AG), 16 g (0.93 mol) of water (H2O), 38 g (0.62 mol) of ethylene glycol (EG, Sigma Aldrich) and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 8 hours to prepare a prepolymer (molar ratio of KBM-1003:TEOS = 9:1, H2O:EG = 6:4), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0199] <Comparative Example 9>

[0200] Except for adding 119 g (0.8 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 42 g (0.2 mol) of TEOS (Evonik Industries AG), 17 g (0.96 mol) of water (H2O), 40 g (0.64 mol) of ethylene glycol (EG, Sigma Aldrich) and 0.1 g of NaOH (Samjeon Chemical Co., Ltd.) to a 500 mL flask, and stirring at 65 °C for 6 hours to prepare a prepolymer (KBM-1003:TEOS = 8:2, H2O:EG = 6:4 molar ratio), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0201] <Comparative Example 10>

[0202] Except for adding 104 g (0.7 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 62 g (0.3 mol) of TEOS (Evonik Industries AG), 18 g (0.99 mol) of water (H2O), 41 g (0.66 mol) of ethylene glycol (EG, Sigma Aldrich) and 0.1 g of NaOH (Samjeon Chemical Co., Ltd.) to a 500 mL flask, and stirring at 65 °C for 5 hours to prepare a prepolymer (KBM-1003:TEOS = 7:3, H2O:EG = 6:4 molar ratio), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0203] <Comparative Example 11>

[0204] Except for adding 133 g (0.895 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 21 g (0.1 mol) of TEOS (Evonik Industries AG), 3 g (0.005 mol) of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (Sigma Aldrich), 17 g (0.93 mol) of water (H2O), 39 g (0.62 mol) of ethylene glycol (EG, Sigma Aldrich), and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 8 hours to prepare a prepolymer (content of the second silane compound in the silane compound: 0.5 mol%), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0205] <Example 1>

[0206] Except for adding 132 g (0.89 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 21 g (0.1 mol) of TEOS (Evonik Industries AG), 5 g (0.01 mol) of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (Sigma Aldrich), 17 g (0.93 mol) of water (H2O), 39 g (0.62 mol) of ethylene glycol (EG, Sigma Aldrich), and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 8 hours to prepare a prepolymer (molar ratio of the second silane compound 1H,1H,2H,2H-perfluorooctyltriethoxysilane in the silane compound: 1.0%), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0207] <Example 2>

[0208] Except for adding 129 g (0.87 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 21 g (0.1 mol) of TEOS (Evonik Industries AG), 15 g (0.03 mol) of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (Sigma Aldrich), 17 g (0.93 mol) of water (H2O), 39 g (0.62 mol) of ethylene glycol (EG, Sigma Aldrich), and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 8 hours to prepare a prepolymer (molar ratio of the second silane compound 1H,1H,2H,2H-perfluorooctyltriethoxysilane in the silane compound: 3.0%), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0209] <Example 3>

[0210] Except for adding 126 g (0.85 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 21 g (0.1 mol) of TEOS (Evonik Industries AG), 26 g (0.05 mol) of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (Sigma Aldrich), 17 g (0.93 mol) of water (H2O), 39 g (0.62 mol) of ethylene glycol (EG, Sigma Aldrich), and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 8 hours to prepare a prepolymer (molar ratio of the second silane compound 1H,1H,2H,2H-perfluorooctyltriethoxysilane in the silane compound: 5.0%), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0211] <Comparative Example 12>

[0212] Except for adding 119 g (0.8 mol) of vinyltrimethoxysilane (Shin-EtsuSilicone Co., Ltd., KBM-1003), 21 g (0.1 mol) of TEOS (Evonik Industries AG), 51 g (0.1 mol) of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (Sigma Aldrich), 17 g (0.93 mol) of water (H2O), 39 g (0.62 mol) of ethylene glycol (EG, Sigma Aldrich), and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 8 hours to prepare a prepolymer (molar ratio of the second silane compound 1H,1H,2H,2H-perfluorooctyltriethoxysilane in the silane compound: 10%), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0213] The molar ratios of the components of the coating compositions according to Comparative Examples 1 to 12 and Examples 1 to 3, as well as the weight-average molecular weight and polydispersity index (PDI) of the prepolymers, are shown in Table 1.

[0214] [Table 1]

[0215]

[0216]

[0217] <Comparative Example 13>

[0218] Except for adding 221 g (0.89 mol) of 3-methacryloyloxypropyltrimethoxysilane (Shin-Etsu Silicone Co., Ltd., KBM-503), 21 g (0.1 mol) of TEOS (Evonik Industries AG), 5 g (0.01 mol) of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (Sigma Aldrich), 17 g (0.93 mol) of water (H2O), 39 g (0.62 mol) of ethylene glycol (EG, Sigma Aldrich), and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 8 hours to prepare a prepolymer (molar ratio of 1H,1H,2H,2H-perfluorooctyltriethoxysilane in the silane compound: 1%), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0219] <Comparative Example 14>

[0220] Except for adding 216 g (0.87 mol) of 3-methacryloyloxypropyltrimethoxysilane (Shin-Etsu Silicone Co., Ltd., KBM-503), 21 g (0.1 mol) of TEOS (Evonik Industries AG), 15 g (0.03 mol) of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (Sigma Aldrich), 17 g (0.93 mol) of water (H2O), 39 g (0.62 mol) of ethylene glycol (EG, Sigma Aldrich), and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 8 hours using a mechanical stirrer to prepare the prepolymer (molar ratio of 1H,1H,2H,2H-perfluorooctyltriethoxysilane in the silane compound: 3%), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0221] <Comparative Example 15>

[0222] Except for adding 211 g (0.85 mol) of 3-methacryloyloxypropyltrimethoxysilane (Shin-Etsu Silicone Co., Ltd., KBM-503), 21 g (0.1 mol) of TEOS (Evonik Industries AG), 26 g (0.05 mol) of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (Sigma Aldrich), 17 g (0.93 mol) of water (H2O), 39 g (0.62 mol) of ethylene glycol (EG, Sigma Aldrich), and 0.1 g of NaOH to a 500 mL flask, and stirring at 65 °C for 8 hours to prepare a prepolymer (molar ratio of 1H,1H,2H,2H-perfluorooctyltriethoxysilane in the silane compound: 5%), the coating film (100) was prepared in the same manner as in Comparative Example 1.

[0223] The molar ratios of the components constituting the coating compositions according to Comparative Examples 12 to 14, as well as the weight-average molecular weight and polydispersity index (PDI) of their prepolymers, are shown in Table 2.

[0224] [Table 2]

[0225]

[0226] <Comparative Example 16>

[0227] Except for adding 3% by weight of the fluorinated antifouling additive KY-1203 (Shinetsu Corporation) to the coating composition based on the total weight of the silane compounds, the coating film (100) was prepared in the same manner as in Comparative Example 8.

[0228] <Example 4>

[0229] Except for adding 3% by weight of the fluorinated antifouling additive KY-1203 (Shinetsu Corporation) to the coating composition based on the total weight of the silane compounds, the coating film (100) was prepared in the same manner as in Example 2.

[0230] <Comparative Example 17>

[0231] Except for adding 3% by weight of the fluorinated antifouling additive KY-1203 (Shinetsu Corporation) to the coating composition based on the total weight of the silane compounds, the coating film (100) was prepared in the same manner as in Comparative Example 13.

[0232] <Measurement Example>

[0233] The physical properties of the coatings prepared in Examples 1 to 4 and Comparative Examples 1 to 17 were measured according to the methods described below, and the results are shown in Table 3 below.

[0234] (1) Water contact angle

[0235] like Figure 2 As shown, using a KRUSS GmbH MSA (Mobile Surface Analyzer), 5 μL of water droplets (WD) were dropped onto the surface of the coating (120) at a rate of 2.7 μL / sec. The angle θ between the surface of the coating (120) and the boundary of the water droplets (WD) was measured 7 times at 0.2-second intervals. This measurement was repeated 5 times, and the average of the 5 measurements was set as the water contact angle.

[0236] In Table 3, the water contact angle is expressed as the initial water contact angle.

[0237] (2) Number of scratches

[0238] The coating (100) was cut into 100mm × 50mm sizes to obtain a coating sample. The coating sample was fixed to a flat surface with the coating (120) facing upwards using tape (3M). Under a load of 0.5kgf and a speed of 45RPM, a 20mm × 20mm stainless steel (SUS) clamp covered with #0000 (LIBERON) nonwoven fabric was moved back and forth 10,000 times on the surface of the coating (120) of the coating sample, and the number of scratches counted by the naked eye was recorded.

[0239] (3) Water contact angle after scraping

[0240] The coating (100) was cut into 100mm × 50mm pieces to obtain coating samples. The coating samples were fixed to a flat surface with the coating (120) facing upwards using tape (3M). A 20mm × 20mm stainless steel (SUS) clamp covered with #0000 (LIBERON) nonwoven fabric was moved back and forth 10,000 times on the surface of the coating (120) of the coating sample to form scratches under a load of 0.5kgf and a speed of 45RPM. Then, the water contact angle of the scratched coating sample was measured according to the method described in (1) above.

[0241] (4) Water contact angle after the eraser is worn down

[0242] The coating (100) was cut into 200mm×50mm sizes to obtain a coating sample. The coating sample was fixed to a flat surface with the coating (120) facing upwards using tape (3M). A Manaslu eraser was fixed to a fixture. The fixture was moved back and forth 1,000 times on the surface of the coating (120) of the coating sample under a load of 0.5kgf and a speed of 45RPM. The water contact angle was then measured according to the method in (1).

[0243] (5) Curling

[0244] Curl measurement is the distance between the edge of a 100mm x 100mm square of coating (100) placed on a flat glass substrate and the bottom of the glass substrate (see [reference]). Figure 3 (The "curl" in the text).

[0245] (6) Crack point radius (R)

[0246] The coating (100) was cut into 20mm × 100mm pieces to prepare coating samples. The coating samples were mounted on a radius bending tester with the coating (120) facing away from the bent coating sample. While bending the coating sample with a gradually decreasing radius of curvature, the radius of curvature at which cracks appeared in the coating sample was measured (see [reference]). Figure 4 ).

[0247] [Table 3]

[0248]

[0249] As can be seen from Table 3, the coatings (100) according to Examples 1 to 4 have a water contact angle of 100° or more, two scratches, a water contact angle of 98° or more after scratching, a water contact angle of 95° or more after rubber abrasion, curling of less than 2 mm, and a crack point radius (R) of less than 1 mm.

[0250] Furthermore, the difference between the water contact angle of the coating (100) according to Examples 1 to 4 and the water contact angle after scratching is less than 10°, and the difference between the water contact angle and the water contact angle after being worn by the eraser is less than 10°.

[0251] As described above, the coating according to one embodiment of this disclosure can be used as a cover window or protective film because it has a high water contact angle, thus exhibiting excellent sliding properties, contamination prevention and removal properties, as well as excellent scratch resistance and abrasion resistance.

Claims

1. A coating composition comprising: Silane compounds; and Polymerization curing aid, in, Based on the total molar number of the silane compound, the silane compound comprises: 80 mol% to 90 mol% of the first silane compound represented by Formula 1 below; 1 mol% to 5 mol% of a second silane compound represented by Formula 2 below; 7 mol% to 15 mol% of the third silane compound represented by Formula 3 below, and The polymerization curing aid includes: Diol; and Water H2O, <Formula 1> <Formula 2> <Formula 3> Si(OR 3 )4 Among them, R 11 The substituted or unsubstituted C2-C5 unsaturated hydrocarbon groups; R 12 R 13 and R 14 Each is independently a C1-C5 alkyl group; R 21 It is a single bond or a C1-C4 alkylene group; R 22 R 23 and R 24 Each is independently a C1-C5 alkyl group; m is an integer from 3 to 10; R 3 It is a C1-C4 alkyl group.

2. The coating composition according to claim 1, wherein, The molar ratio of the silane compound to the polymerization curing aid is 1:1.2 to 1:1.

8.

3. The coating composition according to claim 1, wherein, The first silane compound comprises vinyltrimethoxysilane represented by Formula 4 below: [Formula 4] 。 4. The coating composition according to claim 1, wherein, The second silane compound includes at least one selected from 1H,1H,2H,2H-perfluorooctyltriethoxysilane, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane, 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, and 1H,1H,2H,2H-perfluorodecyltriethoxysilane.

5. The coating composition according to claim 1, wherein, The third silane compound includes at least one of tetraethyl orthosilicate (TEOS) and tetramethyl orthosilicate (TMOS).

6. The coating composition according to claim 1, wherein, The diol includes at least one of ethylene glycol, 1,3-propanediol, and 1,4-butanediol.

7. The coating composition according to claim 1, further comprising an alkaline catalyst.

8. The coating composition according to claim 7, wherein, Based on the total weight of 100 parts by weight of the silane compound, the content of the alkaline catalyst is from 0.05 parts by weight to 0.1 parts by weight.

9. A coating film comprising: Base membrane; and The coating formed on the base film, The coating is formed using a coating composition according to any one of claims 1 to 8.

10. A display device, comprising: Display panel; and The coating according to claim 9 is disposed on the display panel.

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