Preparation of stable photocurable resin composition for hydrolytically stable and optically transparent film for flexible display applications

Abstract

To provide a photocurable resin composition for forming a hydrolytically stable and optically transparent film for flexible display applications.SOLUTION: A photocurable resin composition comprises: a multifunctional thiol monomer having from 3 to 5 thiol functional groups; a multifunctional vinyl monomer having 4 or more vinyl or allyl functional groups; and a multifunctional acrylate monomer having 2 or more acrylate oil functional groups. The photocurable resin composition further comprises: a photoinitiator in a concentration of about 1 / 100 or less; and a sterically hindered phenolic antioxidant in a concentration of about 5 / 100 or less.SELECTED DRAWING: Figure 1

Description

background

[0001] It has been reported that the world is witnessing a remarkable evolution of electronic devices using lighter, thinner, stretchable, and flexible plastic substrates, and this trend calls for further technological innovation in the development of materials for flexible applications.

[0002] Current technology offers a variety of optical films designed to replace rigid substrate materials for flexible display applications. Examples of these materials include polyethylene terephthalate (PET), polybutylene naphthalate (PBN), polyimide (PI), colorless polyimide (CPI), and cyclic olefin polymer (COP). While these materials generally exhibit high transmittance and low haze in the visible light spectrum, they do not fully meet the requirements for optical film applications in image display devices. Problems include high birefringence for PET and PBN, and lack of flexibility for COP. Furthermore, CPI requires a complex and expensive manufacturing process, and the resulting film has a yellowish tint and high birefringence.

[0003] Furthermore, hydrolytic stability issues under extreme heat aging conditions are also a major concern, making it extremely difficult to maintain desirable optical and thermomechanical properties over long periods of time, especially under high humidity and temperature conditions.

[0004] In terms of chemical structure, many current material formulations use multifunctional monomers, but these often struggle to achieve a good balance between hardness and flexibility. Furthermore, these monomers can leave hazardous isocyanate residues, which can pose safety concerns. [Brief explanation of the drawings]

[0005] For a more complete understanding of the features and advantages of the present disclosure, reference should be made to the following detailed description and the accompanying drawings, in which corresponding numerals indicate corresponding parts and in which:

[0006] [Figure 1] 1 is a cross-sectional view of an optical stack according to a specific embodiment of the present disclosure. [Figure 2] 1 is a cross-sectional view of a flexible display according to a specific embodiment of the present disclosure.

[0007] The illustrated diagrams are for illustrative purposes only and are not intended to assert or imply any limitations with respect to the environment, architecture, design, or process in which different embodiments may be implemented. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present disclosure relates to stable resin compositions for hydrolytically stable, optically transparent films for flexible display applications. The present disclosure further relates to the field of materials science, particularly the development of resin compositions. Furthermore, the present disclosure relates to the field of flexible display technology and the creation of optically transparent films with enhanced surface hardness and hydrolytic stability.

[0009] In recent years, the demand for lighter, thinner, more stretchable, and flexible plastic-based electronic devices has increased, necessitating significant innovations in material development for these applications. Currently, there are a variety of optical films on the market that replace rigid substrate materials for flexible display applications, including polyethylene terephthalate (PET), polybutylene naphthalate (PBN), polyimide (PI), colorless polyimide (CPI), and cyclic olefin polymer (COP). While these films generally have high transmittance and low haze in the visible light spectrum, their performance remains unsatisfactory for optical film applications in image display devices. PET and PBN tend to exhibit high birefringence, while the mechanical properties of COP typically do not meet the flexibility specifications for flexible applications. The manufacturing process for CPI is difficult and expensive, resulting in a yellow film with high birefringence. Therefore, optically clear photocurable resins that can be used to create flexible optical films with high transparency, low haze, low chromaticity, low birefringence, high thermal stability, high light stability, and high hydrolytic stability using a low-cost manufacturing process are desirable.

[0010] The present invention addresses the problems described in the background section by providing a stable photocurable resin composition for producing hydrolytically stable, optically transparent films suitable for flexible display applications. The resin composition comprises a multifunctional thiol monomer, a multifunctional vinyl monomer, and a multifunctional acrylate comonomer in specific ratios, to which a photoinitiator and a sterically hindered phenolic antioxidant are added. The composition can be photocured with a UV dose as low as 1 J / cm2.

[0011] The resulting flexible films exhibit high hydrolytic stability under extreme heat aging conditions, maintaining their optical and thermomechanical properties for extended periods, even at high humidity and temperatures. Furthermore, these films exhibit excellent optical properties, including low haze, low yellowing index, and high transmittance, while also exhibiting excellent hardness and resilience.

[0012] Unique to this invention is the solvent-free synthesis of multifunctional allylic, vinyl, and alkyne monomers using a tin complex catalyst. This orthogonal coupling strategy allows the reaction steps to be initiated and completed in the same reactor without leaving behind by-products or solvent residues. The multifunctional vinyl monomers produced by this thermal coupling contain two urethane groups per molecule and a hydrophobic rigid core, improving the overall hydrolytic stability and mechanical properties of the resulting material. This method allows for up to nine allyl functional groups per molecule. This results in a low molecular weight per functional group, forming a uniform crosslinked polymer network that maintains high hardness and flexibility in film form. Replacing allyl with alkyne significantly improves hardness by reducing the molecular weight per functional group and achieving a high crosslink density that contributes to hardness.

[0013] The present invention also discloses specific molar ratios of total thiol groups from the multifunctional thiol monomer to total acrylate and vinyl groups from the multifunctional acrylate and vinyl monomers, which contribute to improved material properties, such as improved tensile strength and a balance of hardness and flexibility.

[0014] In terms of safety, the present invention also addresses the potential hazards associated with large-scale handling of chemicals and provides guidelines for safe handling and storage procedures. The present invention represents a significant advancement in the field of flexible display technology by providing a solution to existing challenges and improving both the performance and safety of optical film materials.

[0015] Provided herein is the preparation of a stable photocurable resin composition for hydrolytically stable, optically clear films for flexible display applications, the resin composition comprising about 20-50 wt% multifunctional thiol monomer, about 20-50 wt% multifunctional vinyl monomer, 10-60 wt% multifunctional acrylate comonomer, less than 3 parts by weight of a photoinitiator, and less than 1 part by weight of a sterically hindered phenolic antioxidant, and having a photoirradiation efficiency of 1 J / cm. 2 These flexible films can be photocured with UV doses as low as 1000 kJ / cm². These flexible films have high hydrolytic stability under extreme heat aging conditions, maintaining their optical and thermomechanical properties for at least 500 hours at 65°C and 90% humidity. The flexible polymer films also exhibited excellent optical properties, with haze <1%, YI <1, and transmittance >90%, and good elasticity.

[0016] This disclosure describes a hydrolytically stable, optically clear film made from a photocurable, optically clear resin composition containing a multifunctional thiol monomer and a multifunctional acrylate and vinyl comonomer. The optically clear resin can be photocured by actinic radiation curing to yield a flexible, optically clear film with a transmittance of 90% or more in the visible spectrum, a yellowing index of 1 or less, and an optical haze of 1% or less. The film can withstand accelerated heat aging conditions of 65°C and 95% relative humidity for 500 hours. The film also exhibits excellent thermal stability, exhibiting a T g is above 100°C, and T 5% is above 320°C.

[0017] The present disclosure provides an example of a photocurable resin composition for forming a hydrolytically stable optical film, the optically clear photocurable resin composition comprising one multifunctional thiol monomer containing three or more functional groups, a multifunctional vinyl monomer containing three or more vinyl / allyl functional groups, a multifunctional acrylate monomer containing two or more acrylate functional groups, a photoinitiator present at a concentration of about 1 part in 100 or less, and a sterically hindered phenolic antioxidant present at a concentration of about 5 parts in 100 or less.

[0018] The multifunctional vinyl monomer is synthesized in one pot using a completely orthogonal coupling strategy using a tin complex catalyst without the use of solvents. Optionally, the reaction steps can be initiated and completed in the same reactor, making it a "one-pot" process. This process leaves no by-products or solvent residues. The multifunctional vinyl monomer formed by thermal coupling contains two urethane groups per molecule and a hydrophobic rigid core.

[0019] The molar ratio of total thiol groups from the multifunctional thiol monomer to total acrylate groups from the multifunctional acrylate monomer is greater than 0.2. The molar ratio of total thiol groups from the multifunctional thiol monomer to total vinyl groups from the multifunctional vinyl monomer is greater than 1.

[0020] An optical film formed by actinic radiation curing of a photocurable resin is provided, comprising a multifunctional thiol monomer containing three or more functional groups, a multifunctional vinyl monomer containing three or more vinyl / allyl functional groups, a multifunctional acrylate monomer containing two or more acrylate functional groups, a photoinitiator present at a concentration of about 1 in 100 or less, and a sterically hindered phenolic antioxidant present at a concentration of about 5 in 100 or less.

[0021] Additionally or alternatively, the optical film comprises one or more of the following features, individually or in combination: The optically clear resin formulation, after curing, provides a cured terpolymer having a modulus of greater than 2 GPa at 25°C. The optically clear resin composition provides a cured terpolymer having a glass transition temperature greater than 100°C.

[0022] In the synthesis process, a multifunctional isocyanate is directly coupled, usually with a catalyst, with an alcohol containing one or more vinyl / allyl / propargyl groups.

[0023] Urethanes have the ability to form secondary interactions within them, resulting in improved mechanical properties, such as increased tensile strength. These urethane monomers have a rigid, hydrophobic core structure, which improves hydrolytic stability and mechanical properties. Aliphatic urethanes generally have heat and chemical resistance, but temperatures above 150°C may cause dissociation and bond exchange.

[0024] Using multifunctional monomers (e.g., allyl / vinyl) with low molecular weight per functional group can increase crosslink density and improve material hardness. However, high hardness is not determined solely by functionality; the structure of the monomer (e.g., rigid core) also plays a role in determining both hardness and flexibility. Based on our research, we found that hardness can be significantly improved by using monomers with functionality greater than three and molecular weight (MW) per functional group less than 150 g / mol.

[0025] Maintaining flexibility while increasing hardness can be challenging in materials with tunable properties. These materials should outperform traditional polyacrylate-based hard coats in terms of flexibility and hydrolytic stability.

[0026] Once synthesized, these monomers are safe and stable under normal conditions. However, caution is advised as they may contain trace amounts of isocyanates, which can be harmful. When handling these chemicals on a large scale, it is important to use appropriate personal protective equipment to ensure safety. Ideally, these monomers should be stored under an inert atmosphere for long-term storage.

[0027] FIG. 1 is a cross-sectional view of an optical stack 1 according to a specific embodiment of the present disclosure. As shown, the optical stack 1 includes an adhesive layer 6 comprising a photocurable resin positioned between and in contact with a first surface of a first substrate 2 and a second surface of a second substrate 4. The adhesive layer 6 may be in direct contact with the first surface of the first substrate 2 and the second surface of the second substrate 4. In other embodiments, the adhesive layer 6 may be in indirect contact with the first surface of the first substrate 2 and the second surface of the second substrate 4, in which case one or more additional layers (not shown) are disposed between the adhesive layer 6 and the first surface of the first substrate 2 and between the adhesive layer 6 and the second surface of the second substrate 4. Additional layers include, but are not limited to, a hard coat layer, a primer layer, a polarizing layer, a light-emitting layer, or a color filter layer. Furthermore, the adhesive layer 6 may comprise any embodiment of the photocurable resin disclosed herein.

[0028] 2 is a cross-sectional view of a flexible display 200 according to a specific embodiment of the present disclosure. As shown, the flexible display 200 includes multiple layers commonly associated with flexible displays, including a window layer 202, a polarizing layer 204, a display layer 208, and a support film layer 210. Adhesive layers 206 containing a photocurable resin are disposed between each of the layers (202 / 204, 204 / 208, and 208 / 210). More specifically, one of the adhesive layers 206 is disposed between and in contact with a first surface of the window layer 202 and a first surface of the polarizing layer 204, another adhesive layer 206 is disposed between and in contact with a second surface of the polarizing layer 204 and a first surface of the display layer 208, and yet another adhesive layer 206 is disposed between and in contact with a second surface of the display layer 208 and a first surface of the support film layer 210.

[0029] In other embodiments, the adhesive layer 206 may be in indirect contact with the first surface of the window layer 202, the first surface of the polarizing layer 204, the second surface of the polarizing layer 204, the first surface of the display layer 208, the second surface of the display layer 208, and the first surface of the support film layer 210. Here, one or more additional layers (not shown) are disposed between the adhesive layer 206 and the first surface of the window layer 202, the first surface of the polarizing layer 204, the second surface of the polarizing layer 204, the first surface of the display layer 208, the second surface of the display layer 208, and the first surface of the support film layer 210. The additional layers include, but are not limited to, a hard coat layer, a primer layer, a polarizing layer, a light-emitting layer, or a color filter layer. The adhesive layer 206 may comprise any embodiment of the photocurable resin disclosed herein. Furthermore, it should be noted that embodiments of the flexible display 200 may include additional layers utilized in flexible displays and separated by additional adhesive layers 206. This can be appreciated and understood by those skilled in the art.

[0030] In any of the disclosed embodiments, adhesive layer 6 / adhesive layer 206 each includes a thickness between 25 μm and 500 μm. In one embodiment, adhesive layer 6 / adhesive layer 206 each includes a thickness of 50 μm.

[0031] One or more embodiments of the present disclosure provide materials for building higher quality and performance flexible display technologies relative to other flexible display technologies.

[0032] It should be noted that the photocurable resins presented herein may be utilized in displays / display devices / display panels, which may be flexible or inflexible. The photocurable resins may be incorporated into one or more layers of the display / display device / display panel, including, but not limited to, a sealing layer, a cathode layer, a light-emitting layer, an adhesive layer, a conductive layer, an anode layer, a substrate layer, and any layers mentioned in connection with FIG. 2. It should be understood that the display / display device / display panel may include additional film layers not mentioned herein.

[0033] In one embodiment of the present disclosure, an electronic device is provided that utilizes one or more photocurable resins of the present disclosure in a display / display device / display panel associated with the electronic device. For illustrative purposes, the electronic device may be any of a smartphone, a mobile phone, a videophone, a camera, a wearable device (such as electronic clothing, an electronic accessory, a smartwatch, a head-mounted device, an electronic bracelet, an electronic necklace, or an electronic tattoo), a personal digital assistant (PDA), a desktop computer (PC), a laptop PC, a netbook PC, a portable multimedia player (PMP), a digital audio player, a mobile medical device, an e-book reader, and the like. In additional embodiments, the electronic device may be a smart home appliance that includes a display / display device / display panel. For illustrative purposes, the smart home appliance may be any of an electronic key, a stereo, a television, a set-top box, a television (TV) box, a video recorder, a game console, a vacuum cleaner, a digital video disc (DVD) player, a refrigerator, an air conditioner, an oven, a dryer, an air purifier, a microwave oven, a washing machine, an electronic dictionary, an electronic photo frame, and the like.

[0034] The example systems, methods, and acts described in the embodiments presented above are exemplary, and in alternative embodiments, certain acts may be performed in a different order, in parallel with one another, omitted entirely, and / or combined between different example embodiments, and / or certain additional acts may be performed, without departing from the scope and spirit of the various embodiments. Accordingly, such alternative embodiments are encompassed by the description herein.

[0035] As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It will be further understood that, as used herein, the terms "comprises" and / or "comprising" identify the presence of stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, phrases such as "between X and Y" and "between about X and Y" should be interpreted to include X and Y. A phrase such as "between about X and Y" means "between about X and about Y." As used herein, expressions such as "from about X to Y" mean "from about X to about Y."

[0036] The present invention is illustrated by the following non-limiting embodiments.

[0037] Aspect 1. 1. A photocurable resin composition for forming a hydrolytically stable and optically transparent film, the photocurable resin composition comprising: a multifunctional thiol monomer containing 3 to 5 thiol functional groups; a polyfunctional vinyl monomer containing four or more vinyl / allyl functional groups; a multifunctional acrylate monomer containing two or more acryloyl functional groups; a photoinitiator present in a concentration of 1 / 100 or less; and a sterically hindered phenolic antioxidant present at a concentration of 5 parts per hundred or less; A photocurable resin composition comprising:

[0038] Aspect 2. 10. The photocurable resin composition according to claim 1, wherein the hydrolytically stable and optically transparent film formed from the photocurable resin composition results in an optically transparent resin mixture having a viscosity in the range of 500 to 2000 CP.

[0039] Aspect 3. 2. The optically clear photocurable resin composition of claim 1, wherein the multifunctional vinyl / allyl monomer comprises a rigid hydrophobic core structure per monomer.

[0040] Aspect 4. 2. The optically photocurable transparent resin composition according to embodiment 1, further comprising two urethane functional groups per monomer.

[0041] Aspect 5. 5. The optically clear resin composition of claim 4, wherein the urethane functionality is formed by a one-pot, solvent-free reaction using a tin catalyst or by an uncatalyzed, thermal alcohol-isocyanate coupling reaction without further purification.

[0042] Aspect 6. 1. An optically clear resin composition, wherein a monomer mixture undergoes an orthogonal reaction to form one or more high functionality comonomers, which then undergo a separate reaction to form a thermoset network comprising polyurethane and polysulfide segments.

[0043] Aspect 7. A hydrolytically stable and optically transparent film formed by actinic radiation curing of the photocurable resin composition according to embodiment 1.

[0044] Aspect 8. An optical film formed by actinic ray curing of a photocurable resin, a multifunctional thiol monomer containing three or more thiol functional groups; a polyfunctional ene monomer containing four or more vinyl / allyl functional groups; a multifunctional acrylate monomer containing two or more acryloyl functional groups; a photoinitiator present at a concentration of 1 in 100 or less; a sterically hindered phenolic antioxidant present at a concentration of 5 parts per hundred or less; An optical film comprising:

[0045] Aspect 9. 9. The optical film of embodiment 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured network polymer having a modulus at 20° C. greater than 1 GPa.

[0046] Aspect 10. 9. The optical film of embodiment 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured polymer film having a glass transition temperature greater than 100°C.

[0047] Aspect 11. 9. The optical film of embodiment 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured network polymer having a maltenic hardness greater than 210 MPa.

[0048] Aspect 12. 9. The optical film of embodiment 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured polymer film having a heat aging stability of greater than 500 hours under accelerated conditions of 65° C. and 90° C. relative humidity.

[0049] Aspect 13. 9. The optical film of embodiment 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured polymer film having a physical aging stability of greater than 200,000 cycles at a thickness of 50 μm and a bend radius of 2 mm under ambient conditions.

[0050] Aspect 14. 9. The optical film of embodiment 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a 30 μm thick cured polymer film having a physical aging stability of greater than 200,000 cycles at 1 mm and 2 mm bend radii under ambient conditions.

[0051] Aspect 15. 9. The optical film of embodiment 8, wherein the molar ratio of total thiol groups from the multifunctional thiol monomers to total vinyl groups from the multifunctional vinyl monomers is greater than 1.

[0052] Aspect 16. 9. The optical film of embodiment 8, wherein the molar ratio of total thiol groups from the multifunctional thiol monomers to total acrylate groups from the multifunctional acrylate monomers is greater than 0.2.

[0053] Aspect 17. 9. The optical film of embodiment 8, wherein the total concentration of hydrolyzable ester functional groups is <25 wt.%.

[0054] Aspect 18. 9. The optical film of embodiment 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured network polymer that has high adhesion to a variety of substrates.

[0055] Aspect 19. A display film includes an optical film formed by curing a photocurable resin, the photocurable resin comprising: a multifunctional thiol monomer containing three or more thiol functional groups; a polyfunctional ene monomer containing four or more vinyl / allyl functional groups; a multifunctional acrylate monomer containing two or more acryloyl functional groups; a photoinitiator present at a concentration of 1 in 100 or less; a sterically hindered phenolic antioxidant present at a concentration of 5 parts per hundred or less; Including display film

[0056] Aspect 20. A method for producing a hydrolytically stable and optically transparent film by reacting a photocurable resin composition and curing the photocurable resin composition.

[0057] The above disclosed embodiments are presented for purposes of illustration and to enable those skilled in the art to practice the disclosure, but the disclosure is not intended to be exhaustive or limited to the disclosed forms. Many insubstantial modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the disclosure. The claims are intended to broadly cover the disclosed embodiments and such modifications.

Claims

1. 1. A photocurable resin composition for forming a hydrolytically stable and optically transparent film, the photocurable resin composition comprising: a multifunctional thiol monomer containing 3 to 5 thiol functional groups; a polyfunctional vinyl monomer containing four or more vinyl / allyl functional groups; a multifunctional acrylate monomer containing two or more acryloyl functional groups; a photoinitiator present at a concentration of 1 / 100 or less; and a sterically hindered phenolic antioxidant present at a concentration of 5 parts per hundred or less; A photocurable resin composition comprising:

2. 2. The photocurable resin composition of claim 1, wherein a hydrolytically stable, optically transparent film formed from the photocurable resin composition results in an optically transparent resin mixture having a viscosity in the range of 500 to 2000 CP.

3. 10. The optically clear photocurable resin composition of claim 1, wherein the multifunctional vinyl / allyl monomer comprises a rigid hydrophobic core structure per monomer.

4. 10. The optically photocurable transparent resin composition of claim 1 further comprising two urethane functional groups per monomer.

5. 5. The optically clear resin composition of claim 4, wherein the urethane functional groups are formed by a one-pot, solvent-free reaction using a tin catalyst or by an uncatalyzed, thermal alcohol-isocyanate coupling reaction without further purification.

6. 1. An optically clear resin composition, wherein a monomer mixture undergoes an orthogonal reaction to form one or more high functionality comonomers, which then undergo a separate reaction to form a thermoset network comprising polyurethane and polysulfide segments.

7. 2. A hydrolytically stable and optically transparent film formed by curing the photocurable resin composition of claim 1 with actinic radiation.

8. An optical film formed by actinic ray curing of a photocurable resin, a multifunctional thiol monomer containing three or more thiol functional groups; a polyfunctional ene monomer containing four or more vinyl / allyl functional groups; a multifunctional acrylate monomer containing two or more acryloyl functional groups; a photoinitiator present at a concentration of 1 / 100 or less; a sterically hindered phenolic antioxidant present at a concentration of 5 parts per hundred or less; An optical film comprising:

9. 9. The optical film of claim 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured network polymer having a modulus of greater than 1 GPa at 20[deg.]C.

10. 10. The optical film of claim 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured polymer film having a glass transition temperature greater than 100[deg.]C.

11. 10. The optical film of claim 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured network polymer having a maltenic hardness greater than 210 MPa.

12. 10. The optical film of claim 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured polymer film having a heat aging stability of greater than 500 hours under accelerated conditions of 65°C and 90% relative humidity.

13. 9. The optical film of claim 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured polymer film having a physical aging stability of greater than 200,000 cycles at a thickness of 50 μm and a bend radius of 2 mm under ambient conditions.

14. 10. The optical film of claim 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a 30 μm thick cured polymer film having a physical aging stability of greater than 200,000 cycles at 1 mm and 2 mm bend radii under ambient conditions.

15. 9. The optical film of claim 8, wherein the molar ratio of total thiol groups from the multifunctional thiol monomer to total vinyl groups from the multifunctional vinyl monomer is greater than one.

16. 9. The optical film of claim 8, wherein the molar ratio of total thiol groups from the multifunctional thiol monomer to total acrylate groups from the multifunctional acrylate monomer is greater than 0.

2.

17. 9. The optical film of claim 8, wherein the total concentration of hydrolyzable ester functional groups is <25 wt%.

18. 10. The optical film of claim 8, wherein the multifunctional acrylate, vinyl, and thiol monomers result in a cured network polymer with high adhesion to a variety of substrates.

19. A display film includes an optical film formed by curing a photocurable resin, the photocurable resin comprising: a multifunctional thiol monomer containing three or more thiol functional groups; a polyfunctional ene monomer containing four or more vinyl / allyl functional groups; a multifunctional acrylate monomer containing two or more acryloyl functional groups; a photoinitiator present at a concentration of 1 / 100 or less; a sterically hindered phenolic antioxidant present at a concentration of 5 parts per hundred or less; Including display film

20. A method for producing a hydrolytically stable and optically transparent film by reacting a photocurable resin composition and curing the photocurable resin composition.

Images