Nanoimprint glue with high refractive index and preparation method of nanoimprint glue

Abstract

The invention relates to the technical field of AR / VR optical waveguides, in particular to high-refractive-index nanoimprint glue and a preparation method thereof, and the high-refractive-index nanoimprint glue comprises a solvent, a photoinitiator and a high-refractive-index component; the high refractive index component comprises nano zirconium dioxide and acrylic resin. Compared with the existing product, the coining nano-imprinting glue has higher refractive index, the refractive index tested by an ellipsometer after the solvent is removed is 1.785 (589 nm), and the refractive index of the conventional coining nano-imprinting glue of which the refractive index is increased by nano zirconium dioxide is less than 1.75 (589 nm).

Description

Technical Field

[0001] This invention relates to the field of AR / VR optical waveguide technology, specifically to a high refractive index nanoimprint adhesive and its preparation method. Background Technology

[0002] The global AR / VR market is currently experiencing rapid growth. Nanoimprint lithography (NIL) has become a key technology in the manufacture of core optical components for AR / VR, particularly dominating in core components such as diffractive waveguides and metalenses. High-refractive-index nanoimprint adhesives are the core materials in nanoimprint technology, playing an irreplaceable role, especially in AR / VR, semiconductor, and optical device manufacturing. Currently, high-refractive-index nanoimprint adhesives using nano-zirconia as filler have a refractive index of 1.65-1.75 (589nm). However, nanoimprint waveguide technology demands high-refractive-index nanoimprint adhesives with even higher refractive indices.

[0003] Typically, higher refractive indices require a larger proportion of nano-titanium dioxide as an inorganic filler or the coating of nano-zirconia with nano-titanium dioxide. However, due to its photocatalytic activity, the addition of nano-titanium dioxide can lead to photocatalytic degradation, thus reducing the UV aging resistance of high-refractive-index nanoimprinting adhesives. Furthermore, coating requires a more complex production process. The bottleneck of directly increasing the refractive index of high-refractive-index nanoimprinting adhesives by adding more zirconium dioxide is that as the proportion of nano-zirconia increases, the overall rheological properties of the high-refractive-index nanoimprinting adhesive deteriorate, and the viscosity increases. Ultimately, this makes the high-refractive-index nanoimprinting adhesive difficult to imprint, or results in incomplete or deformed imprinting structures, leading to poor imprinting characteristics. Summary of the Invention

[0004] The purpose of this invention is to provide a high refractive index nanoimprint adhesive and its preparation method, thereby solving the technical problems in the prior art where high refractive index nanoimprint adhesives are difficult to imprint or have incomplete or deformed imprint structures, resulting in poor imprint properties.

[0005] This invention discloses a high refractive index nanoimprint adhesive, comprising a solvent, a photoinitiator, and a high refractive index component; The high-refractive-index components include nano-zirconia and acrylic resin.

[0006] Furthermore, the solvent accounts for 50%-66% of the total weight of the high-refractive-index nanoimprint adhesive.

[0007] Furthermore, the high-refractive-index component accounts for 30%-50% of the weight of the high-refractive-index nanoimprint adhesive.

[0008] Furthermore, the photoinitiator has a weight of at least 1%-4% of the weight of the acrylic resin.

[0009] In some instances, the photoinitiator weight is 1%, 2%, 3%, 4%, 5%, 10%, 20%, 50%, 100%, or 200% of the acrylic resin weight.

[0010] Furthermore, the nano-zirconia accounts for 91%-96% of the weight of the high-refractive-index component.

[0011] Furthermore, the acrylic resin accounts for 4%-9% of the weight of the high-refractive-index component.

[0012] Furthermore, the solvent is propylene glycol methyl ether acetate (PGMEA).

[0013] Furthermore, the acrylic resin is at least one of 4-biphenylmethanol acrylate, 3-phenoxybenzyl acrylate, trimethylolpropane triacrylate, or tricyclodecanediethanol diacrylate.

[0014] Furthermore, the photoinitiator is at least one of 1105 (2-isopropylthioxanthone), 184 (1-hydroxycycloethylphenylacetone), TPO (triphenyl phosphite), TPO-L (ethyl 2,4,6-trimethylbenzoylphenylphosphonate), or DETX (2,4-diethylthiazolidon).

[0015] A method for preparing a high refractive index nanoimprint adhesive involves adding raw materials, stirring at room temperature in the dark, then sonicating at room temperature in the dark, filtering twice, and aging to obtain the final product.

[0016] Furthermore, the filtration is performed using a 0.22μm polytetrafluoroethylene filter membrane to prevent light exposure.

[0017] An application of a high-refractive-index nanoimprint adhesive for the VR / AR industry.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. Through experiments, we discovered that when 4-biphenylmethanol acrylate and trimethylolpropane triacrylate are present simultaneously in the adhesive formulation, and the content of 4-biphenylmethanol acrylate is greater than the weight of trimethylolpropane triacrylate, these two resins are more likely to synergistically form a sliding electric double layer on the surface of nano-zirconia, resulting in good overall fluidity of the adhesive. By utilizing this synergistic effect, we were able to overcome the bottleneck of nano-zirconia dosage (more than existing technologies, resulting in a higher refractive index), and further improve the refractive index of the adhesive while maintaining its imprintability. 2. Compared with existing products, the present invention has a higher refractive index. After removing the solvent, the refractive index measured by ellipsometer is 1.785 (589nm), while the refractive index of conventional imprintable nano-imprinting adhesives that rely on nano-zirconia to increase the refractive index is <1.75 (589nm). 3. Compared with existing nano-titanium dioxide products, the present invention has a longer UV aging resistance time; 4. Compared with existing nano-titanium dioxide coated nano-zirconia products, this invention does not involve complicated coating process steps; 5. This invention maximizes the refractive index of nano-imprint adhesive by using only nano-zirconia as an inorganic high-refractive-index filler, and also has good imprintability. In contrast, existing technologies require the selection of zirconium dioxide coated with titanium dioxide, or the use of titanium dioxide entirely (the introduction of titanium dioxide can lead to easy photocatalytic aging of the adhesive). Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a physical example of the high refractive index nanoimprint adhesive from Example 1 of the present invention.

[0021] Figure 2 This is a scanning electron microscope image of the high refractive index nanoimprint adhesive after imprinting in Example 1 of the present invention.

[0022] Figure 3 This is a physical example of the high refractive index nanoimprint adhesive from Example 2 of the present invention.

[0023] Figure 4 This is a scanning electron microscope image of the high refractive index nanoimprint adhesive after imprinting in Example 2 of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] Example 1 This embodiment discloses a high refractive index nanoimprint adhesive and its preparation method, including: 1. Solvent: PMEG A (propylene glycol methyl ether acetate), accounting for 70% of the weight of the high refractive index nanoimprint adhesive.

[0026] 2. Nano-zirconia, accounting for 27.2% of the weight of the high refractive index nanoimprint adhesive.

[0027] 3. Trimethylolpropane triacrylate, accounting for 1.03% of the weight of the high refractive index nanoimprint adhesive.

[0028] 4,4-Biphenylmethanol acrylate, accounting for 1.68% of the weight of the high refractive index nanoimprint adhesive.

[0029] 5. Photoinitiator 1105 (2-isopropylthioxanthraquinone), accounting for 0.09% of the weight of the high refractive index nanoimprint adhesive.

[0030] The preparation process for this formula is as follows: 1. Add the following materials in the following order: trimethylolpropane triacrylate, 4-biphenylmethanol acrylate, nano-zirconium dioxide, PMEGA (propylene glycol methyl ether acetate), and photoinitiator 1173 (2-hydroxy-2-methylphenylacetone).

[0031] 2. Stir at room temperature in the dark for 0.5 hours at a stirring speed of 60 rpm.

[0032] 3. Ultrasound at room temperature, protected from light for 0.5 hours, with an ultrasonic power of 400W.

[0033] 4. Filter twice using a 0.22μm polytetrafluoroethylene filter membrane to avoid light.

[0034] 5. Aged at 50℃ in the dark for 5 hours.

[0035] like Figures 1-2 As shown, Figure 1 The high-refractive-index nanoimprint adhesive prepared in this process is a light blue, semi-transparent liquid. Figure 2 As can be seen, the imprinted nanoscale oblique tooth structure is clear, the cycle is stable, and the top is flat.

[0036] Based on this formulation, the properties after solvent removal and curing using the nanoimprinting process are as follows: 1. Pencil hardness 1kg / HB, 0 scratches after 5 tests.

[0037] 2. Visible light transmittance: 91.8%-92.1%.

[0038] 3. Haze level: 0.21-0.24.

[0039] 4. Water contact angle 79°.

[0040] 5. After 192 hours of UV aging test, the performance showed no significant decline.

[0041] 6. No significant decrease in performance after 192 hours of sunlight aging test.

[0042] 7. No significant performance degradation was observed after 192 hours of high temperature and high humidity (temperature 85℃, humidity 85℃).

[0043] 8. The refractive index measured by the ellipsometer is 1.785 (589 nm).

[0044] 9. The embossing effect is good.

[0045] Note: Curing conditions are: 365nm LED (light-emitting diode) ultraviolet light source, intensity 300mW / cm². 2 Cure 60 seconds.

[0046] Example 2 This embodiment discloses a high refractive index nanoimprint adhesive and its preparation method, including: 1. Solvent: PMEG A (propylene glycol methyl ether acetate), accounting for 70% of the weight of the high refractive index nanoimprint adhesive.

[0047] 2. Nano-zirconia, accounting for 27.2% of the weight of the high refractive index nanoimprint adhesive.

[0048] 3. Trimethylolpropane triacrylate, accounting for 0.52% of the weight of the high refractive index nanoimprint adhesive.

[0049] 4,4-Biphenylmethanol acrylate, accounting for 1.68% of the weight of the high refractive index nanoimprint adhesive.

[0050] 5. Tricyclodecanediethanol diacrylate accounts for 0.51% of the weight of the high refractive index nanoimprint adhesive.

[0051] 6. Photoinitiator 1105 (2-isopropylthioxanthraquinone), accounting for 0.09% of the weight of the high refractive index nanoimprint adhesive.

[0052] The preparation process for this formula is as follows: like Figures 3-4 As shown, Figure 3 The high-refractive-index nanoimprint adhesive prepared in this process is a light blue, semi-transparent liquid. Figure 4 As can be seen, the imprinted nanoscale oblique tooth structure is clear, the cycle is stable, and the top is flat.

[0053] 1. Add the following materials in the following order: trimethylolpropane triacrylate, 4-biphenylmethanol acrylate, nano-zirconium dioxide, PMEGA (propylene glycol methyl ether acetate), and photoinitiator 1173 (2-hydroxy-2-methylphenylacetone).

[0054] 2. Stir at room temperature in the dark for 0.5 hours at a stirring speed of 60 rpm.

[0055] 3. Ultrasound at room temperature, protected from light for 0.5 hours, with an ultrasonic power of 400W.

[0056] 4. Filter twice using a 0.22μm polytetrafluoroethylene filter membrane to avoid light.

[0057] 5. Aged at 50℃ in the dark for 5 hours.

[0058] Based on this formulation, the properties after solvent removal and curing using the nanoimprinting process are as follows: 1. Pencil hardness 1kg / 2HB, 0 scratches after 5 tests.

[0059] 2. Visible light transmittance: 91.2%-92.3%.

[0060] 3. Haze level: 0.21-0.23.

[0061] 4. Water contact angle 78°.

[0062] 5. After 192 hours of UV aging test, the performance showed no significant decline.

[0063] 6. No significant decrease in performance after 192 hours of sunlight aging test.

[0064] 7. No significant performance degradation was observed after 192 hours of high temperature and high humidity (temperature 85℃, humidity 85℃).

[0065] 8. The refractive index measured by the ellipsometer is 1.789 (589 nm).

[0066] 9. The embossing effect is good.

[0067] Note: Curing conditions are: 365nm LED (light-emitting diode) ultraviolet light source, intensity 300mW / cm². 2 Cure 60 seconds.

[0068] Example 3 This embodiment discloses a high refractive index nanoimprint adhesive and its preparation method, including: 1. Solvent: PMEG A (propylene glycol methyl ether acetate), accounting for 70% of the weight of the high refractive index nanoimprint adhesive.

[0069] 2. Nano-zirconia, accounting for 28.8% of the weight of the high refractive index nano-imprint adhesive.

[0070] 3. Trimethylolpropane triacrylate, accounting for 0.22% of the weight of the high refractive index nanoimprint adhesive.

[0071] 4,4-Biphenylmethanol acrylate, accounting for 0.72% of the weight of the high refractive index nanoimprint adhesive.

[0072] 5. Tricyclodecanediethanol diacrylate accounts for 0.22% of the weight of the high refractive index nanoimprint adhesive.

[0073] 6. Photoinitiator 1105 (2-isopropylthioxanthraquinone), accounting for 0.04% of the weight of the high refractive index nanoimprint adhesive.

[0074] The preparation process for this formula is as follows: 1. Add the following materials in the following order: trimethylolpropane triacrylate, 4-biphenylmethanol acrylate, nano-zirconium dioxide, PMEGA (propylene glycol methyl ether acetate), and photoinitiator 1173 (2-hydroxy-2-methylphenylacetone).

[0075] 2. Stir at room temperature in the dark for 0.5 hours at a stirring speed of 60 rpm.

[0076] 3. Ultrasound at room temperature, protected from light for 0.5 hours, with an ultrasonic power of 400W.

[0077] 4. Filter twice using a 0.22μm polytetrafluoroethylene filter membrane to avoid light.

[0078] 5. Aged at 50℃ in the dark for 5 hours.

[0079] Based on this formulation, the properties after solvent removal and curing using the nanoimprinting process are as follows: 1. Pencil hardness 1kg / HB, 0 scratches after 5 tests.

[0080] 2. Visible light transmittance: 91.2%-92.3%.

[0081] 3. Haze level: 0.21-0.23.

[0082] 4. Water contact angle 78°.

[0083] 5. After 192 hours of UV aging test, the performance showed no significant decline.

[0084] 6. No significant decrease in performance after 192 hours of sunlight aging test.

[0085] 7. No significant performance degradation was observed after 192 hours of high temperature and high humidity (temperature 85℃, humidity 85℃).

[0086] 8. The refractive index measured by the ellipsometer is 1.792 (589 nm).

[0087] 9. Excellent embossing effect Note: Curing conditions are: 365nm LED (light-emitting diode) ultraviolet light source, intensity 300mW / cm². 2 Cure 60 seconds.

[0088] In this embodiment, the changes in the amount of zirconium oxide and the resin ratio resulted in an increase in refractive index and a decrease in hardness.

[0089] Comparative Example 1 This embodiment discloses a high refractive index nanoimprint adhesive and its preparation method, including: 1. Solvent: PMEG A (propylene glycol methyl ether acetate), accounting for 70% of the weight of the high refractive index nanoimprint adhesive.

[0090] 2. Nano-zirconia, accounting for 27.2% of the weight of the high refractive index nanoimprint adhesive.

[0091] 3. Trimethylolpropane triacrylate, accounting for 1.35% of the weight of the high refractive index nanoimprint adhesive.

[0092] 4,4-Biphenylmethanol acrylate accounts for 1.37% of the weight of the high refractive index nanoimprint adhesive.

[0093] 5. Photoinitiator 1105 (2-isopropylthioxanthraquinone), accounting for 0.08% of the weight of the high refractive index nanoimprint adhesive.

[0094] The preparation process for this formula is as follows: 1. Add the following materials in the following order: trimethylolpropane triacrylate, 4-biphenylmethanol acrylate, nano-zirconium dioxide, PMEGA (propylene glycol methyl ether acetate), and photoinitiator 1173 (2-hydroxy-2-methylphenylacetone).

[0095] 2. Stir at room temperature in the dark for 0.5 hours at a stirring speed of 60 rpm.

[0096] 3. Ultrasound at room temperature, protected from light for 0.5 hours, with an ultrasonic power of 400W.

[0097] 4. Filter twice using a 0.22μm polytetrafluoroethylene filter membrane to avoid light.

[0098] 5. Aged at 50℃ in the dark for 5 hours.

[0099] Based on this formulation, the properties after solvent removal and curing using the nanoimprinting process are as follows: 1. Pencil hardness 1kg / 2HB, 0 scratches after 5 tests.

[0100] 2. Visible light transmittance: 91.8%-92.1%.

[0101] 3. Haze level: 0.21-0.24.

[0102] 4. Water contact angle 79°.

[0103] 5. After 192 hours of UV aging test, the performance showed no significant decline.

[0104] 6. No significant decrease in performance after 192 hours of sunlight aging test.

[0105] 7. No significant performance degradation was observed after 192 hours of high temperature and high humidity (temperature 85℃, humidity 85℃).

[0106] 8. The refractive index measured by the ellipsometer is 1.781 (589 nm).

[0107] 9. Unable to imprint.

[0108] Note: Curing conditions are: 365nm LED (light-emitting diode) ultraviolet light source, intensity 300mW / cm². 2 Cure 60 seconds.

[0109] The only change from Example 1 is the resin ratio, which leads to a decrease in refractive index, an increase in hardness, and an inability to imprint.

[0110] Comparative Example 2 This embodiment discloses a high refractive index nanoimprint adhesive and its preparation method, including: 1. Solvent: PMEG A (propylene glycol methyl ether acetate), accounting for 70% of the weight of the high refractive index nanoimprint adhesive.

[0111] 2. Nano-zirconia, accounting for 29.1% of the weight of the high refractive index nano-imprint adhesive.

[0112] 3. Trimethylolpropane triacrylate, accounting for 0.33% of the weight of the high refractive index nanoimprint adhesive.

[0113] 4,4-Biphenylmethanol acrylate, accounting for 0.54% of the weight of the high refractive index nanoimprint adhesive.

[0114] 5. Photoinitiator 1105 (2-isopropylthioxanthraquinone), accounting for 0.03% of the weight of the high refractive index nanoimprint adhesive.

[0115] The preparation process for this formula is as follows: 1. Add the following materials in the following order: trimethylolpropane triacrylate, 4-biphenylmethanol acrylate, nano-zirconium dioxide, PMEGA (propylene glycol methyl ether acetate), and photoinitiator 1173 (2-hydroxy-2-methylphenylacetone).

[0116] 2. Stir at room temperature in the dark for 0.5 hours at a stirring speed of 60 rpm.

[0117] 3. Ultrasound at room temperature, protected from light for 0.5 hours, with an ultrasonic power of 400W.

[0118] 4. Filter twice using a 0.22μm polytetrafluoroethylene filter membrane to avoid light.

[0119] 5. Aged at 50℃ in the dark for 5 hours.

[0120] Based on this formulation, the properties after solvent removal and curing using the nanoimprinting process are as follows: 1. Pencil hardness 1kg / 2HB, 0 scratches after 5 tests.

[0121] 2. Visible light transmittance: 91.8%-92.1%.

[0122] 3. Haze level: 0.21-0.24.

[0123] 4. Water contact angle 79°.

[0124] 5. After 192 hours of UV aging test, the performance showed no significant decline.

[0125] 6. No significant decrease in performance after 192 hours of sunlight aging test.

[0126] 7. No significant performance degradation was observed after 192 hours of high temperature and high humidity (temperature 85℃, humidity 85℃).

[0127] 8. The refractive index measured by the ellipsometer is 1.795 (589 nm).

[0128] 9. Unable to imprint.

[0129] Note: Curing conditions are: 365nm LED (light-emitting diode) ultraviolet light source, intensity 300mW / cm². 2 Cure 60 seconds.

[0130] The only change from Example 1 is the alteration of the zirconium oxide ratio, which leads to an increase in refractive index and hardness, making embossing impossible.

[0131] Comparative Example 3 This embodiment discloses a high refractive index nanoimprint adhesive and its preparation method, including: 1. Solvent: PMEG A (propylene glycol methyl ether acetate), accounting for 70% of the weight of the high refractive index nanoimprint adhesive.

[0132] 2. Nano-zirconia, accounting for 26.25% of the weight of the high refractive index nanoimprint adhesive.

[0133] 3. Trimethylolpropane triacrylate, accounting for 1.38% of the weight of the high refractive index nanoimprint adhesive.

[0134] 4,4-Biphenylmethanol acrylate, accounting for 2.25% of the weight of the high refractive index nanoimprint adhesive.

[0135] 5. Photoinitiator 1105 (2-isopropylthioxanthraquinone), accounting for 0.12% of the weight of the high refractive index nanoimprint adhesive.

[0136] The preparation process for this formula is as follows: 1. Add the following materials in the following order: trimethylolpropane triacrylate, 4-biphenylmethanol acrylate, nano-zirconium dioxide, PMEGA (propylene glycol methyl ether acetate), and photoinitiator 1173 (2-hydroxy-2-methylphenylacetone).

[0137] 2. Stir at room temperature in the dark for 0.5 hours at a stirring speed of 60 rpm.

[0138] 3. Ultrasound at room temperature, protected from light for 0.5 hours, with an ultrasonic power of 400W.

[0139] 4. Filter twice using a 0.22μm polytetrafluoroethylene filter membrane to avoid light.

[0140] 5. Aged at 50℃ in the dark for 5 hours.

[0141] Based on this formulation, the properties after solvent removal and curing using the nanoimprinting process are as follows: 1. Pencil hardness 1kg / 2HB, 0 scratches after 5 tests.

[0142] 2. Visible light transmittance: 91.8%-92.1%.

[0143] 3. Haze level: 0.21-0.24.

[0144] 4. Water contact angle 79°.

[0145] 5. After 192 hours of UV aging test, the performance showed no significant decline.

[0146] 6. No significant decrease in performance after 192 hours of sunlight aging test.

[0147] 7. No significant performance degradation was observed after 192 hours of high temperature and high humidity (temperature 85℃, humidity 85℃).

[0148] 8. The refractive index measured by the ellipsometer is 1.750 (589 nm).

[0149] 9. Unable to imprint.

[0150] Note: Curing conditions are: 365nm LED (light-emitting diode) ultraviolet light source, intensity 300mW / cm². 2 Cure 60 seconds.

[0151] The only change from Example 1 is the alteration of the zirconium oxide ratio, which leads to a decrease in refractive index and an increase in hardness.

[0152] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments based on the inspiration of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be determined by the claims, and the specification can be used to interpret the claims.

Claims

1. A high refractive index nanoimprint glue, characterized by: The high-refractive component comprises nano-zirconium dioxide and acrylic resin. The high-refractive component comprises nano-zirconium dioxide and acrylic resin.

2. The high refractive index nanoimprint glue of claim 1, wherein: The solvent accounts for 50%-66% of the total weight of the high-refractive nano-imprint adhesive.

3. The high refractive index nanoimprint glue of claim 1, wherein: The high-refractive component accounts for 30%-50% of the weight of the high-refractive nano-imprint adhesive.

4. The high refractive index nanoimprint glue of claim 1, wherein: The weight of the photoinitiator is at least 1%-4% of the weight of the acrylic resin.

5. The high refractive index nanoimprint glue of claim 1, wherein: The weight of the nano-zirconium dioxide accounts for 91%-96% of the weight of the high-refractive component. The weight of the acrylic resin accounts for 4%-9% of the weight of the high-refractive component.

6. The high refractive index nanoimprint glue of claim 1, wherein: The solvent is propylene glycol methyl ether acetate.

7. The high refractive index nanoimprint glue of claim 6, wherein: The acrylic resin is at least one of 4-biphenyl methanol acrylate, 3-phenoxy benzyl acrylate, trimethylolpropane triacrylate, or tricyclodecane dimethylol diacrylate.

8. The high refractive index nanoimprint glue of claim 1, wherein: The photoinitiator is at least one of 2-isopropyl thioxanthone, 1-hydroxy cyclohexyl phenyl ketone, triphenyl phosphite, 2,4,6-trimethyl benzoyl phenyl ethyl phosphonate, or 2,4-diethyl thioxanthone.

9. The method of claim 1-8, wherein the method is characterized by: After adding the raw materials, stir at room temperature in the dark, then ultrasonic at room temperature in the dark, filter twice, and then age to obtain the product.

10. Use of a high refractive index nanoimprint glue according to any one of claims 1 to 8 or a glue obtained by the method of claim 9, characterized in that: Used in the VR / AR industry.

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