Optical device and method of manufacturing the same

Abstract

This invention discloses a silicone composition comprising a polysiloxane and having a viscosity of less than 500 mPa·s measured at 25°C according to DIN ISO 3219; and a method for manufacturing an optical device comprising the silicone composition, wherein the Shore 00 hardness of the cured product of the silicone composition, measured according to DIN ISO 7619, is less than 20.

Description

Technical Field

[0001] This invention relates to optical devices comprising silicone compositions and methods for manufacturing the same. Prior Technology

[0002] Optical adhesive formulations are used to improve visibility, readability, and durability by filling the air gaps between screen panels and display modules, or between two panes of glass in a smart window system.

[0003] Materials used in optical adhesive formulations include acrylate-based materials, silicone-based materials, and urethane-based materials. In particular, acrylate-based materials have been widely used in optical adhesive formulations for small displays. However, as the size of displays or windows increases, optical devices using acrylate-based materials experience blistering, optical degradation such as yellowing, and a decrease in chemical and mechanical properties due to internal and external stresses such as heat, UV radiation, and electricity. Summary of the Invention

[0004] [Technical Issues]

[0005] Therefore, the present invention was made in view of the above-mentioned problems, and one object of the present invention is an optical device comprising a silicone composition and having excellent processability, mechanical properties, transparency and light transmittance; and a method for manufacturing the optical device.

[0006] [Technical Solution]

[0007] According to one aspect of the invention, the above and other objectives can be achieved by providing an optical device comprising: a first substrate; a functional film formed on the first substrate; a second substrate formed on the functional film; a sealing portion configured to fix the first substrate and the second substrate; and an adhesive portion formed between the first substrate and the second substrate, wherein the adhesive portion comprises a silicone composition, wherein the silicone composition comprises a polysiloxane and has a viscosity of less than 500 mPa·s measured at 25°C according to DIN ISO 3219, and the Shore 00 hardness of the cured product made from the silicone composition is less than 20 as measured according to DIN ISO 7619.

[0008] In one embodiment of the present invention, the functional film can be attached to the first substrate by means of an optical adhesive film.

[0009] In one embodiment of the present invention, the optical device may be a touch panel display for an automobile.

[0010] According to another aspect of the present invention, a method for manufacturing an optical device is provided, the method comprising: preparing a first substrate and a second substrate; laminating a functional film on the first substrate; introducing a second substrate onto the functional film and fixing the first substrate and the second substrate; and forming an adhesive layer by injecting a silicone composition between the first substrate and the second substrate, wherein the silicone composition is fed by an injection method, the silicone composition comprising a polysiloxane and having a viscosity of less than 500 mPa·s measured at 25°C according to DIN ISO 3219, and the cured product made from the silicone composition having a Shore 00 hardness of less than 20 measured according to DIN ISO 7619.

[0011] In one embodiment of the present invention, during lamination, the functional film can be adhered to the first substrate by means of an optical adhesive film.

[0012] In one embodiment of the present invention, the method may further include: after laminating a functional film on a first substrate, forming a baffle between the first substrate and the second substrate to maintain the gap between the first substrate and the second substrate.

[0013] In one embodiment of the invention, the adhesive layer can be formed by curing a silicone composition at room temperature.

[0014] According to another aspect of the invention, a silicone composition is provided comprising a polysiloxane and having a viscosity of less than 500 mPa·s as measured at 25°C according to DIN ISO 3219, and the cured product of the silicone composition having a Shore 00 hardness of less than 20 as measured according to DIN ISO 7619.

[0015] In one embodiment of the present invention, the polysiloxane may comprise: a first organopolysiloxane (a) having an alkenyl group at the end of its main chain; a second organopolysiloxane (b) comprising siloxane units represented by R1R2R3SiO1 / 2 and SiO4 / 2; and a first organohydrogen polysiloxane (c) comprising at least one hydrogen group bonded to a silicon atom, wherein R1, R2 and R3 are each independently substituted or unsubstituted monovalent hydrocarbon groups, and at least one of R1, R2 and R3 is an alkenyl group.

[0016] In one embodiment of the present invention, the polysiloxane may comprise: 50% to 98% by weight of a first organopolysiloxane (a); 1% to 10% by weight of a second organopolysiloxane (b); and 1% to 40% by weight of a first organohydrogen polysiloxane (c).

[0017] In one embodiment of the present invention, the first organopolysiloxane may comprise: a 1-1 organopolysiloxane (a-1) comprising siloxane units with an average chain length of less than 150, the 1-1 organopolysiloxane (a-1) having a weight average molecular weight (Mw) of 8,000 g / mole or less; and a 1-2 organopolysiloxane (a-2) comprising siloxane units with an average chain length of 150 or greater and 1,200 or less, the 1-2 organopolysiloxane (a-2) having a weight average molecular weight of 40,000 g / mole to 80,000 g / mole.

[0018] In one embodiment of the present invention, the first organohydrogen polysiloxane may comprise: 1-1 organohydrogen polysiloxane (c-1) having hydrogen groups at the end of its main chain; and 1-2 organohydrogen polysiloxane (c-2) having hydrogen groups in its side chain.

[0019] In one embodiment of the present invention, 1-1 organohydrogen polysiloxane may comprise siloxane units with an average chain length greater than 10.

[0020] In one embodiment of the present invention, based on 100 parts by weight of 1-1 organohydrogen polysiloxane, the content of 1-2 organohydrogen polysiloxane may be 15 parts by weight or less.

[0021] In one embodiment of the present invention, the silicone composition may further comprise at least one of a tackifier, a reaction inhibitor, and a curing catalyst.

[0022] [Beneficial Effects]

[0023] An optical device comprising the silicone composition according to the present invention and a method for manufacturing the optical device satisfy a certain range of viscosity and hardness.

[0024] Therefore, the flowability and curability of silicone compositions can be improved, and the adhesive layer can be effectively formed at room temperature by injection without the need for UV methods, so that the adhesive layer can be applied even when the size of the display increases.

[0025] In addition, it can suppress uneven yellowing and bubble formation, and improve mechanical properties while ensuring transparency and light transmittance. Simple Explanation of the Diagram

[0026] Figures 1 and 2 schematically illustrate a method for manufacturing an optical device according to the present invention. Implementation

[0027] The structural or functional descriptions of the embodiments disclosed in this specification or application are merely for the purpose of explaining the embodiments of the technical concept of the present invention. The embodiments of the technical concept of the present invention may be implemented in various forms different from the embodiments disclosed in this specification or application, and should not be construed as limiting the technical concept of the present invention to the embodiments described in this specification or application.

[0028] In this specification or application, unless otherwise disclosed, when a component is "included," it means that only that component is included, or that the component may further include another component. Furthermore, it should be understood that, unless otherwise specified, in all cases, all numerical ranges representing the physical properties, dimensions, etc., of the components described in this specification or application are modified by the term "about."

[0029] In this specification or application, the term "upper part" may refer to a position that is in contact with one surface of a component (part) or a position that is spaced apart from one surface of a component (part). Additionally, in this specification or application, the term "lower part" may refer to a position that is symmetrical to the "upper part" position and in contact with another surface of a component (part), or a position that is spaced apart from another surface of a component (part).

[0030] Each term described in this specification or application has the following meaning.

[0031] Siloxanes: Compounds containing Si-O-Si bonds.

[0032] Polysiloxanes: Compounds with multiple Si-O-Si bonds.

[0033] Silicone compositions refer to compositions consisting solely of polysiloxane compounds, or compositions containing polysiloxanes and mixed with other compounds to achieve specific properties.

[0034] Organic polysiloxanes: Polysiloxanes having a structure in which organic groups are bonded to Si atoms that form Si-O-Si bonds.

[0035] Organohydrogen polysiloxanes: Polysiloxanes having a structure in which hydrogen groups are bonded to Si atoms that form Si-O-Si bonds.

[0036] Main chain: The longest chain in polysiloxane compounds.

[0037] Side chain: A branched structure from the main chain of a polysiloxane compound.

[0038] Linear polysiloxanes: Polysiloxanes having a structure in which the siloxane chains are not linked by inserting atomic linking groups into the Si atoms of the main chain (-Si-O-Si-O-) of the polysiloxane.

[0039] Branched polysiloxanes: Polysiloxanes containing at least one T-shaped or cross-shaped branch point.

[0040] The optical device comprising a silicone composition and a method for manufacturing the optical device are described in detail below.

[0041] The silicone compositions according to the present invention comprise polysiloxanes.

[0042] The polysiloxane may include a first organopolysiloxane having an alkenyl group at the end of its main chain. Silicone compositions containing the first organopolysiloxane exhibit excellent moldability and can improve viscoelasticity, transparency, and light transmittance.

[0043] The alkenyl group can be vinyl, allyl, methyl allyl, butenyl, pentenyl, or hexenyl. Preferably, the alkenyl group can be vinyl.

[0044] In the main chain of the first organopolysiloxane, the Si-bonded organic groups other than the alkenyl group can be substituted or unsubstituted monovalent hydrocarbon groups, specifically methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, or alkyl halides. Preferably, the Si-bonded organic group can be methyl.

[0045] The first organopolysiloxane may include 1-1 organopolysiloxane comprising siloxane units with an average chain length of less than 150 and a weight average molecular weight of 8,000 g / mole or less; and 1-2 organopolysiloxanes comprising siloxane units with an average chain length of 150 or greater and 1,200 or less and a weight average molecular weight of 40,000 g / mole to 80,000 g / mole.

[0046] The first organopolysiloxane may include 1-1 organopolysiloxane comprising siloxane units with an average chain length of less than 110 and a weight average molecular weight of 7,800 g / mole or less; and 1-2 organopolysiloxanes comprising siloxane units with an average chain length of 150 or greater and 1,100 or less and a weight average molecular weight of 47,000 g / mole to 76,000 g / mole.

[0047] The weight ratio of 1-1 organopolysiloxane to 1-2 organopolysiloxane can be from 100:1 to 1:1. When this range is met, the flowability of the silicone composition can be improved, thus allowing the adhesive layer to be effectively formed at room temperature by injection molding.

[0048] 1-1 Organic polysiloxanes can be represented by the following formula 1: [Formula 1] .

[0049] In Equation 1, n ranges from 0 to 150.

[0050] 1-2 Organic polysiloxanes can be represented by the following formula 2: [Equation 2] .

[0051] In Equation 2, n ranges from 150 to 1,100.

[0052] Based on the total weight of the polysiloxane, the content of the first organopolysiloxane can be from 50% to 98% by weight, 55% to 98% by weight, 60% to 98% by weight, or 60% to 90% by weight. When this range is met, the silicone composition can have suitable flowability, thus improving processability.

[0053] The polysiloxane may include a second organopolysiloxane comprising siloxane units represented by R1R2R3SiO1 / 2 and SiO4 / 2. Silicone compositions comprising the second organopolysiloxane may have improved toughness, thus enhancing mechanical properties.

[0054] R1R2R3SiO1 / 2 can refer to monofunctional polysiloxane.

[0055] R1R2R3SiO1 / 2 can be represented by the following equation 3: [Formula 3] .

[0056] In Formula 3, R1, R2 and R3 are each independently a substituted or unsubstituted monovalent hydrocarbon group, and at least one of R1, R2 and R3 is an alkenyl group.

[0057] SiO4 / 2 can refer to tetrafunctional polysiloxane.

[0058] SiO4 / 2 can be represented by the following equation: [Formula 4] .

[0059] The second organopolysiloxane can be represented by the following formula 5: [Formula 5] .

[0060] In Formula 5, R4 and R5 are each independently a substituted or unsubstituted monovalent hydrocarbon group, R6 is an alkenyl group, x is an integer from 10 to 2,000, and y is an integer from 10 to 1,000.

[0061] The second organopolysiloxane may have a weight average molecular weight of 1,000 g / mol to 500,000 g / mol, 1,000 g / mol to 300,000 g / mol, 1,000 g / mol to 100,000 g / mol, or 2,000 g / mol to 100,000 g / mol.

[0062] Based on the total weight of the polysiloxane, the content of the second organopolysiloxane can be greater than 0% by weight and 10% by weight or less, 1% to 10% by weight, 2% to 10% by weight, or 3% to 10% by weight. When this range is met, the silicone composition can have suitable flowability and can improve the mechanical properties of the cured product made from the silicone composition.

[0063] The polysiloxane may include a first organohydrogen polysiloxane containing at least one hydrogen group bonded to a silicon atom. The first organohydrogen polysiloxane may act as a crosslinking agent for the alkenyl group of the first organohydrogen polysiloxane and / or the alkenyl group of the second organohydrogen polysiloxane. The hydrogen atoms bonded to the Si atoms in the first organohydrogen polysiloxane may undergo an addition reaction with the alkenyl group of the first organohydrogen polysiloxane and / or the alkenyl group of the second organohydrogen polysiloxane. The curing reaction of the silicone composition may be carried out via an addition reaction.

[0064] The first organohydrogen polysiloxane may include 1-1 organohydrogen polysiloxanes containing hydrogen groups at the end of their main chain and 1-2 organohydrogen polysiloxanes containing hydrogen groups in their side chains.

[0065] 1-1 organohydrogen polysiloxanes may have an average chain length greater than 1, greater than 5, greater than 10, or greater than 10 and less than 1,000. 1-1 organohydrogen polysiloxanes may have a weight-average molecular weight of 8,000 g / mol to 500,000 g / mol, 8,000 g / mol to 400,000 g / mol, 8,000 g / mol to 300,000 g / mol, or 8,000 g / mol to 100,000 g / mol.

[0066] 1-2 organohydrogen polysiloxanes may have an average chain length of 1 or greater, 3 or greater, 5 or greater, or 1 or greater and 1,000 or less. 1-2 organohydrogen polysiloxanes may have a weight-average molecular weight of 1,000 g / mol to 300,000 g / mol, 1,000 g / mol to 200,000 g / mol, 1,000 g / mol to 100,000 g / mol, or 1,000 g / mol to 90,000 g / mol.

[0067] Based on 100 parts by weight of 1-1 organohydrogen polysiloxane, the content of 1-2 organohydrogen polysiloxane can be 30 parts by weight or less, 20 parts by weight or less, 15 parts by weight or less, 13 parts by weight or less, 12 parts by weight or less, or 10 parts by weight or less. When this range is met, the silicone composition can have suitable flowability and suitable curing speed, and can suppress changes over time.

[0068] 1-1 Organic hydrogen polysiloxanes can be represented by the following formula 6: [Formula 6] .

[0069] In Equation 6, t ranges from 2 to 1,000.

[0070] 1-2 Organic hydrogen polysiloxanes can be represented by the following formula 7: [Formula 7] .

[0071] In Equation 7, p is an integer from 1 to 500, and y is an integer from 1 to 500.

[0072] Based on the total weight of the polysiloxane, the content of the first organohydrogen polysiloxane can be from 1% to 40% by weight, 1% to 38% by weight, 5% to 38% by weight, 10% to 38% by weight, or 10% to 35% by weight. When this range is met, the silicone composition can have suitable flowability and curability.

[0073] The polysiloxane may contain 50% to 98% by weight of a first organopolysiloxane, 1% to 10% by weight of a second organopolysiloxane, and 1% to 40% by weight of a first organohydrogen polysiloxane.

[0074] The polysiloxane may contain 50% to 90% by weight of a first organopolysiloxane, 5% to 10% by weight of a second organopolysiloxane, and 5% to 40% by weight of a first organohydrogen polysiloxane.

[0075] The polysiloxane may contain 50% to 80% by weight of a first organopolysiloxane, 5% to 10% by weight of a second organopolysiloxane, and 15% to 40% by weight of a first organohydrogen polysiloxane.

[0076] When this range is met, the flowability and curability of the silicone composition can be improved, and the adhesive layer can be effectively formed at room temperature by injection, so that the adhesive layer can be applied even when the size of the display increases.

[0077] The silicone composition may further include at least one of a tackifier, a reaction inhibitor, and a curing catalyst.

[0078] Tackifiers can improve the adhesive strength of silicone compositions. Tackifiers may include one or more selected from the group consisting of: glycidoxypropyltrimethoxysilane, glycidoxypropylmethyldimethoxysilane, glycidoxypropyltriethoxysilane or glycidoxypropylmethyldiethoxysilane, 2-(3-triethoxysilylpropyl)maleic anhydride, N-(3-trimethoxysilylpropyl)urea, N-(3-triethoxysilylpropyl)urea, N-(trimethoxysilylmethyl)urea, N-(methyldimethoxysilylmethyl)urea, O-(methylcarbamatomethyl)methyldimethoxysilane, O-(methylcarbamatomethyl)trimethoxysilane. thyl)trimethoxysilane), O-(ethylcarbamatomethyl)methyldiethoxysilane, O-(ethylcarbamatomethyl)triethoxysilane, 3-methacryloxypropyltrimethoxysilane, methacryloxymethyltrimethoxysilane, methacryloxymethylmethyldimethoxysilane, methacryloxymethyltriethoxysilane, methacryloxymethyldimethoxysilane, 3-propenyloxypropyltrimethoxysilane, acryloxymethyltrimethoxysilane and acryloxymethyldimethoxysilane.

[0079] The silicone composition may include a tackifier in amounts of 0.1% to 10% by weight, 0.1% to 5% by weight, 0.1% to 3% by weight, or 0.1% to 2% by weight, based on the total weight of the silicone composition.

[0080] The reaction inhibitor suppresses the viscosity increase of the silicone composition. The reaction inhibitor slows down the hydrogenation silylation addition reaction between the H atoms of the Si-bonded groups in the first organohydrogenated polysiloxane and the alkenyl groups of the first organohydrogenated polysiloxane and / or the alkenyl groups of the second organohydrogenated polysiloxane. The reaction inhibitor may include vinyl-containing polysiloxanes, which are compounds different from the first organohydrogenated polysiloxane.

[0081] The total weight of the silicone composition may include a reaction inhibitor in the amount of 0.001% to 3% by weight, 0.001% to 2% by weight, 0.001% to 1% by weight, or 0.01% to 1% by weight.

[0082] The curing catalyst can promote the addition reaction between a first organohydrogen polysiloxane and a first organopolysiloxane and / or a second organopolysiloxane. The curing catalyst may include a platinum catalyst, a rhodium catalyst, a palladium catalyst, or a complex compound. The complex compound may be a platinum / alkene-siloxane complex compound, a platinum / olefin complex compound, or a platinum / carbonyl complex compound.

[0083] The silicone composition may include a curing catalyst in amounts of 0.001% to 1% by weight, 0.001% to 0.5% by weight, 0.001% to 0.3% by weight, or 0.01% to 0.3% by weight, based on the total weight of the silicone composition.

[0084] The viscosity of the silicone composition at 25°C, measured according to DIN ISO 3219, is less than 500 mPa·s, and the Shore 00 hardness of the cured product of the silicone composition, measured according to DIN ISO 7619, is less than 20. The viscosity of the silicone composition at 25°C, measured according to DIN ISO 3219, can be less than 400 mPa·s, and the Shore 00 hardness of the cured product of the silicone composition, measured according to DIN ISO 7619, can be 10 or greater and less than 20. The viscosity of the silicone composition at 25°C, measured according to DIN ISO 3219, can be greater than 50 mPa·s and less than 400 mPa·s, and the Shore 00 hardness of the cured product of the silicone composition, measured according to DIN ISO 7619, can be 2 or greater and less than 10. The cured product of the silicone composition is cured at about 65°C for about 1 hour, then cooled to room temperature, and can have a thickness of about 6 mm.

[0085] When this range is met, the flowability and curability of the silicone composition can be improved, and the adhesive layer can be effectively formed at room temperature by injection molding. Therefore, the adhesive layer can be applied even when the display size increases. In addition, uneven yellowing and bubble formation can be suppressed, and mechanical properties can be improved while ensuring transparency and light transmittance.

[0086] The storage modulus of silicone compositions, measured by dynamic mechanical analysis according to ASTM E143, can be 0.2 × 10³ Pa to 8 × 10³ Pa, 0.5 × 10³ Pa to 8 × 10³ Pa, 1 × 10³ Pa to 8 × 10³ Pa, 2 × 10³ Pa to 8 × 10³ Pa, or 3 × 10³ Pa to 8 × 10³ Pa. When this range is met, the mechanical properties of the cured silicone composition do not deteriorate, and rapid changes in storage modulus can be suppressed.

[0087] The refractive index of the cured silicone composition, measured using an Abbe refractive index meter at wavelengths along the D line (480 nm, 589 nm), can be 1.35 to 1.45, 1.38 to 1.45, 1.38 to 1.43, or 1.39 to 1.42. The transmittance of the cured silicone composition (based on a wavelength of 450 nm), measured using a Spectord 200 Plus UV-Vis spectrometer, can be 99% or greater, 99.1% or greater, 99.2% or greater, 99.3% or greater, 99.5% or greater, or 99.6% or greater. The haze of the cured silicone composition can be less than 0.3%, less than 0.2%, or less than 0.1% according to ASTM D1003-97. According to ASTM D313-73, the yellowness index of cured silicone compositions can be less than 0.5%, less than 0.4%, less than 0.3%, or less than 0.2%. When this range is met, transparency is improved and light can be smoothly emitted from the light source when the cured silicone composition is used as an adhesive layer for optical devices.

[0088] The tensile strength of cured silicone compositions, measured according to ASTM D2651, can be greater than 1.0 kgf / cm², greater than 1.5 kgf / cm², greater than 2.0 kgf / cm², greater than 2.5 kgf / cm², or greater than 3.0 kgf / cm². According to ISO 3521, and Equation 1, the silicone composition and cured silicone composition can have a volume shrinkage rate of less than 0.5%, less than 0.4%, less than 0.3%, less than 0.2%, or less than 0.1%. Meeting these ranges improves mechanical properties while ensuring transparency and light transmittance.

[0089] [Equation 1]

[0090] (1 – Volume of silicone composition / Volume of cured product) × 100%

[0091] The method of manufacturing an optical device according to the present invention includes the steps of preparing a first and a second substrate, laminating a functional film on the first substrate, introducing a second substrate onto the functional film and fixing the first and second substrates, and forming an adhesive layer by injecting a silicone composition between the first and the second substrates, wherein the silicone composition is introduced by an injection method.

[0092] Figures 1 and 2 schematically illustrate a method for manufacturing an optical device according to the present invention. Referring to Figures 1 and 2, the manufacturing method includes the steps of preparing a first substrate 10 and a second substrate 20.

[0093] The first substrate 10 and the second substrate 20 can be substrates in optical device components. The first substrate 10 and the second substrate 20 can be soda-lime glass.

[0094] The manufacturing method includes the step of laminating a functional film 30 on a first substrate 10.

[0095] In the lamination step, the functional film 30 can be attached to the first substrate 10 by means of the optical adhesive film 40.

[0096] Functional film 30 is a functional film that can be applied to liquid crystal display (LCD), organic light emitting display (OLED), electronic paper display, surface-conduction electron-emitter display (SED), light emitting diode (LED) display, or electroluminescent display (ELD).

[0097] The optical adhesive film 40 can be an optically clear adhesive (OCA) film. The functional film 30 can be fixed to the first substrate 10 by means of the optical adhesive film 40. The optical adhesive film 40 can be an optically clear adhesive film. The optical adhesive film 40 can be a double-sided adhesive tape and can have a light transmittance of 99% or greater, 99.3% or greater, or 99.5% or greater.

[0098] The manufacturing method may further include the following steps: after laminating the functional film 30 on the first substrate 10, forming a baffle 50 between the first substrate 10 and the second substrate 20 to maintain the gap between the first substrate 10 and the second substrate 20.

[0099] The manufacturing method includes the step of fixing the first substrate 10 and the second substrate 20 after introducing the second substrate 20 onto the functional film 30.

[0100] The first substrate 10 and the second substrate 20 can be fixed by the baffle 50. The baffle 50 can be removed after the silicone composition has cured. However, depending on the intended use, the baffle 50 may not be removed.

[0101] The manufacturing method includes the step of feeding a silicone composition between a first substrate 10 and a second substrate 20 to form an adhesive layer, and feeding the silicone composition by an injection method.

[0102] When using the injection method, an adhesive layer can be effectively formed at room temperature without the need for UV methods, even on large displays. After the adhesive layer is formed, uneven yellowing and bubble formation can be suppressed, and mechanical properties can be improved while ensuring transparency and light transmittance.

[0103] The silicone composition comprises a polysiloxane and has a viscosity of less than 500 mPa·s at 25°C, as measured according to DIN ISO 3219, and the cured product of the silicone composition has a Shore 00 hardness of less than 20, as measured according to DIN ISO 7619. This silicone composition can be the same as the silicone composition described above. When these ranges are met, the silicone composition can have suitable flowability and curing speed, thus allowing for the efficient formation of an adhesive layer on large displays via injection molding.

[0104] The adhesive layer can be formed by curing the silicone composition at room temperature. The adhesive layer can be formed by curing the silicone composition at room temperature for about 20 minutes to 600 minutes, about 20 minutes to 500 minutes, about 20 minutes to 400 minutes, about 20 minutes to 300 minutes, or about 20 minutes to 240 minutes.

[0105] The optical device 100 manufactured according to this manufacturing method includes a first substrate 10, a functional film 30 formed on the first substrate 10, a second substrate 20 formed on the functional film 30, a sealing portion 60 for fixing the first substrate 10 and the second substrate 20, and an adhesive portion 70 formed between the first substrate 10 and the second substrate 20, wherein the adhesive portion 70 comprises a silicone composition comprising polysiloxane, the viscosity of the silicone composition at 25°C as measured according to DIN ISO 3219 is less than 500 mPa·s, and the Shore 00 hardness of the cured product made from the silicone composition as measured according to DIN ISO 7619 is less than 20.

[0106] The silicone composition can be the same as the silicone composition described above.

[0107] The functional film 30 can be attached to the first substrate 10 by means of an optical adhesive film 40.

[0108] The optical adhesive film 40 can be the same as the optical adhesive film described above.

[0109] The optical device 100 may be a liquid crystal display (LCD), an organic light-emitting display (OLED), an electronic paper display (e-paper), a surface conduction electron emission display (SED), a light-emitting diode display (LED), or an electroluminescent display (ELD).

[0110] Preferably, the optical device 100 can be a touch panel display or a curved display for automobiles.

[0111] When the silicone composition is used as an optical adhesive material for the optical device 100, the optical device 100 may have improved light transmittance, thermal stability and mechanical properties.

[0112] The present invention will be described in more detail below based on embodiments and comparative examples. However, the following embodiments and comparative examples are merely examples for explaining the present invention in more detail, and the present invention is not limited to the following embodiments and comparative examples.

[0113] [Example]

[0114] Silicone compositions of Examples 1 to 6 and Comparative Examples 1 to 3 were prepared to have the components and contents shown in Table 1 below. - Component (A) A-1: CH2=CH(CH3)2SiO(Si(CH3)2O)nSi(CH3)2CH=CH2, Mw = 7,000 g / mol, average chain length = 100 A-2:CH2=CH(CH3)2SiO(Si(CH3)2O)nSi(CH3)2CH=CH2, Mw = 47,000 g / mol, average chain length = 600 A-3:CH2=CH(CH3)2SiO(Si(CH3)2O)nSi(CH3)2CH=CH2, Mw = 76,000 g / mol, average chain length = 1,100 - Component (B) B-1:M5Mvi 1Q4 B-2:M7Mvi 1Q12 Vi refers to vinyl, M refers to monofunctional siloxane unit, and Q refers to tetrafunctional siloxane unit. - Component (C) C-1:H-(Si(CH3)2O)nSi(CH3)2-H, Mw = 4,000 g / mol, average chain length = 20 C-2:(CH3)3SiO((CH3)2SiO)n(CH3HSiO)mSi(CH3)3, Mw = 5,000 g / mol, average chain length = 30 - Component (D) D-1:3-Glycidoxypropyltrimethoxysilane (tackifier) D-2: Platinum-divinyltetramethyldisiloxane complex (curing catalyst) D-3: 1-Ethynyl-1-cyclohexanol (reaction inhibitor)

[0115] [Table 1] Classification Component (A) Component (B) Component (C) Component (D) A-1 A-2 A-3 B-1 B-2 C-1 C-2 D-1 D-2 D-3 unit weight% ppm1) Example 1 62.3 - - 8.7 - 26.6 2.4 300 100 - Example 2 49.2 10.1 3.2 - 6.2 28.4 2.9 300 100 100 Example 3 52.4 1.2 - 5.3 4.1 35.4 1.6 300 100 - Example 4 65.1 - 2.2 8.8 - 23.9 - 300 100 - Example 5 62.5 - - 8.8 - 26.4 2.3 300 100 100 Example 6 55.1 - 2.5 5.2 3.4 33.4 0.4 300 100 - Comparative Example 1 55.0 - - - 20.2 21.4 3.4 300 100 - Comparative Example 2 - 50.2 9.5 - 5.2 11.5 23.6 300 100 - Comparative Example 3 10.4 - 45.7 20.5 - 20.2 3.2 300 100 - 1) ppm: Content based on the total weight of components (A), (B) and (C)

[0116] [Experimental Examples]

[0117] [Experimental Examples] [1] [-viscosity]

[0118] The viscosity of each silicone composition of Examples 1 to 6 and Comparative Examples 1 to 3 at 25°C was measured according to DIN ISO 3219. The results are shown in Table 2 below.

[0119] [Experimental Examples] [2 –] [Xiao family]

[00] [hardness]

[0120] The silicone compositions of Examples 1 to 6 and Comparative Examples 1 to 3 were fed into Teflon-coated molds with a width of 4 cm × a length of 5 cm × a thickness of 6 mm and heat-cured at 65°C for 1 hour, followed by cooling at room temperature. Next, the hardness of the hardened material was measured using a Shore 00 tester according to DIN ISO 7619. The results are shown in Table 2 below.

[0121] [Experimental Example] [3 –] [Moldability]

[0122] The pot life of each silicone composition of Examples 1 to 6 and Comparative Examples 1 to 3 was measured at 23°C. Specifically, the initial viscosity of each silicone composition of Examples 1 to 6 and Comparative Examples 1 to 3 was measured in the same manner as in Experimental Example 1, and the time it took for the viscosity to become twice the initial viscosity was defined as the pot life. Additionally, the gel time of each silicone composition of Examples 1 to 6 and Comparative Examples 1 to 3 at 25°C was measured according to ASTM D4473. Molding properties were evaluated based on the following criteria, and the results are shown in Table 2 below. - Excellent: Pot life of 120 minutes or longer and gel time of 600 minutes or less. - Normal: The applicable period is 120 minutes or longer, or the gel time is 600 minutes or shorter. - Poor: Potential application time less than 120 minutes and gel time longer than 600 minutes

[0123] [Experimental Examples] [4 –] [Volume shrinkage rate]

[0124] According to ISO 3521, the volume shrinkage rate of each of the silicone compositions of Examples 1 to 6 and Comparative Examples 1 to 3, and the cured products of Examples 1 to 6 and Comparative Examples 1 to 3 according to Experimental Example 2, was measured according to Equation 1 below. The results are shown in Table 2 below. [Equation 1] (1 – Volume of silicone composition / Volume of cured product) × 100%

[0125] [Experimental Examples] [5 –] Tensile strength () [pull strength] [)]

[0126] Tensile strength was measured according to ASTM D2651. Specifically, the silicone compositions of Examples 1 to 6 and Comparative Examples 1 to 3 were coated onto a soda-lime glass substrate (coating size: 7 square centimeters). Next, the glass substrate was covered with each silicone composition and allowed to stand at room temperature for 24 hours. Then, the tensile strength was measured at 300 mm / min, and the results are shown in Table 2 below.

[0127] [Experimental Examples] [6 –] [Light transmittance]

[0128] The transmittance (based on a wavelength of 450 nm) of the cured products made from the silicone compositions of Examples 1 to 6 and Comparative Examples 1 to 3 and manufactured in Experimental Example 2 was measured using a Spectord 200 Plus UV-Vis spectrometer. The results are shown in Table 2 below.

[0129] [Experimental Examples] [7 –] [Haze]

[0130] The haze of the cured products prepared from the silicone compositions of Examples 1 to 6 and Comparative Examples 1 to 3 and manufactured in Experimental Example 2 was measured according to ASTM D1003-97. The results are shown in Table 2 below.

[0131] [Experimental Examples] [8 –] Yellowness Index

[0132] The yellowness index of the cured products prepared from the silicone compositions of Examples 1 to 6 and Comparative Examples 1 to 3 and manufactured in Experimental Example 2 was measured according to ASTM D313-73. The results are shown in Table 2 below.

[0133] [Experimental Examples] [9 –] [Refractive index]

[0134] The refractive index of the hardened products prepared from the silicone compositions of Examples 1 to 6 and Comparative Examples 1 to 3 and manufactured in Experimental Example 2 was measured at the D-line (480 nm, 589 nm) using an Abbe refractometer. The results are shown in Table 2 below.

[0135] [Experimental Examples] [10 –] [Processability]

[0136] A cycloolefin copolymer (COP) film was laminated onto a first substrate using an optically transparent adhesive (OCA), and then a second substrate was introduced onto the film to fix the first and second substrates. Next, the silicone compositions of Examples 1 to 6 and Comparative Examples 1 to 3 were injected between the first and second substrates using an injection molding process and allowed to stand at room temperature for 24 hours. Processability was evaluated based on the following criteria, and the results are shown in Table 2 below. - Excellent: The gap between the first substrate and the second substrate is filled without producing bubbles or wrinkles. - Normal: The gap between the first substrate and the second substrate is filled, but some bubbles or wrinkles appear. - Poor: Due to the poor spreadability of the silicone composition, the gap between the first substrate and the second substrate was not filled.

[0137] [Table 2] Classification unit Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Does it meet the first condition 1) ○ ○ ○ ○ ○ ○ ○ × × Does it meet the second condition 2) ○ ○ ○ ○ ○ ○ × ○ × viscosity mPa.s 120 200 130 200 120 200 450 3,600 4,500 Shore 00 hardness - 4 6 4 6 4 7 25 4 45 Molding Excellent Excellent Excellent Excellent Excellent Excellent normal normal Difference Volume shrinkage rate % <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 1.0 1.5 3.2 Tensile strength kgf / cm2 4.58 4.52 4.53 4.54 4.48 4.42 4.62 1.22 5.54 Light transmittance % >99.6 >99.6 >99.6 >99.6 >99.6 >99.6 99.2 99.0 98.2 Haze <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.3 Yellowness Index - <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 0.3 <0.2 0.4 Refractive index 1.41 1.41 1.41 1.41 1.41 1.41 1.43 1.45 1.45 Processability Excellent Excellent Excellent Excellent Excellent Excellent normal Difference Difference 1) First condition: Viscosity measured at 25°C according to DIN ISO 3219 is less than 500 mPa·s. 2) Second condition: The Shore 00 hardness, measured according to DIN ISO 7619, is less than 20.

[0138] As shown in Table 2, compared with the silicone compositions of Comparative Examples 1 to 3, the silicone compositions of Examples 1 to 6 meet specific ranges of viscosity and Shore 00 hardness, thereby improving the flowability and curing properties of the silicone compositions. Therefore, it can be confirmed that the adhesive layer is effectively formed at room temperature by injection molding, suppressing uneven yellowing, bubble formation, etc., and improving mechanical properties while ensuring transparency and light transmittance.

[0139] 10: First substrate 20: Second substrate 30: Functional membrane 40: Optical adhesive film 50: baffle 60: Sealing part 70: Adhesive Section 100: Optical devices

Claims

1. An optical device comprising: a first substrate; a functional film formed on the first substrate; a second substrate formed on the functional film; a sealing portion configured to fix the first substrate and the second substrate; and an adhesive portion formed between the first substrate and the second substrate, wherein the adhesive portion comprises a silicone composition, wherein the silicone composition comprises a polysiloxane and has a strength of less than 500 mPa measured at 25°C according to DIN ISO 3219. The viscosity in mPa·s and the Shore 00 hardness of the cured product made from the silicone composition, as measured according to DIN ISO 7619, are less than 20, wherein the polysiloxane comprises: a first organopolysiloxane (a) having an alkenyl group at one end of one of its main chains; a second organopolysiloxane (b) comprising siloxane units represented by R1R2R3SiO1 / 2 and SiO4 / 2; and a first organohydrogen polysiloxane (c) comprising at least one hydrogen group bonded to a silicon atom, wherein R1, R2 and R3 are each independently substituted or unsubstituted monovalent hydrocarbon groups, and at least one of R1, R2 and R3 is an alkenyl group.

2. The optical device as claimed in claim 1, wherein the functional film is attached to the first substrate by means of an optical adhesive film.

3. The optical device as claimed in claim 1, wherein the optical device is for a touch panel display and smart window system for automobiles.

4. A method of manufacturing an optical device, the method comprising: preparing a first substrate and a second substrate; laminating a functional film on the first substrate; introducing a second substrate onto the functional film and fixing the first substrate and the second substrate; and forming an adhesive layer by injecting a silicone composition between the first substrate and the second substrate, wherein the silicone composition is fed by an injection method, the silicone composition comprising a polysiloxane and having a strength of less than 500 mPa measured at 25°C according to DIN ISO 3219. The viscosity in seconds, and the Shore 00 hardness of the cured product made from the silicone composition as measured according to DIN ISO 7619, are less than 20, wherein the polysiloxane comprises: a first organopolysiloxane (a) having an alkenyl group at one end of one of its main chains; a second organopolysiloxane (b) comprising siloxane units represented by R1R2R3SiO1 / 2 and SiO4 / 2; and a first organohydrogen polysiloxane (c) comprising at least one hydrogen group bonded to a silicon atom, wherein R1, R2 and R3 are each independently substituted or unsubstituted monovalent hydrocarbon groups, and at least one of R1, R2 and R3 is an alkenyl group.

5. The method as described in request item 4, wherein, In this lamination, the functional film is attached to the first substrate by means of an optical adhesive film.

6. The method of claim 4, further comprising: after laminating the functional film on the first substrate, forming a baffle between the first substrate and the second substrate for maintaining the spacing between the first substrate and the second substrate.

7. The method of claim 4, wherein the adhesive layer is formed by curing the silicone composition at room temperature.

8. A silicone composition comprising a polysiloxane and having a viscosity of less than 500 mPa·s as measured at 25°C according to DIN ISO 3219, and a Shore 00 hardness of less than 20 as measured according to DIN ISO 7619 for the cured product of the silicone composition, wherein the polysiloxane comprises: a first organopolysiloxane comprising an alkenyl group at one end of one of its main chains (a); a second organopolysiloxane comprising silicone units represented by R1R2R3SiO1 / 2 and SiO4 / 2 (b); and a first organohydrogen polysiloxane comprising at least one hydrogen group bonded to a silicon atom (c), wherein R1, R2 and R3 are each independently substituted or unsubstituted monovalent hydrocarbon groups, and at least one of R1, R2 and R3 is an alkenyl group.

9. The silicone composition of claim 8, wherein the polysiloxane comprises: 50% to 98% by weight of the first organopolysiloxane (a); 1% to 10% by weight of the second organopolysiloxane (b); and 1% to 40% by weight of the first organohydrogen polysiloxane (c).

10. The silicone composition of claim 8, wherein the first organopolysiloxane comprises: a 1-1 organopolysiloxane (a-1) comprising siloxane units with an average chain length of less than 150, the 1-1 organopolysiloxane (a-1) having a weight average molecular weight of 8,000 g / mole or less; and a 1-2 organopolysiloxane (a-2) comprising siloxane units with an average chain length of 150 or greater and 1,200 or less, the 1-2 organopolysiloxane (a-2) having a weight average molecular weight of 40,000 g / mole to 80,000 g / mole.

11. The silicone composition of claim 8, wherein the first organohydrogen polysiloxane comprises: a 1-1 organohydrogen polysiloxane (c-1) having a hydrogen group at the end of its main chain; and a 1-2 organohydrogen polysiloxane (c-2) having a hydrogen group in its side chain.

12. The silicone composition of claim 11, wherein the 1-1 organohydrogen polysiloxane comprises silicone units with an average chain length greater than 10.

13. The silicone composition as claimed in claim 11, wherein the content of the 1-2 organohydrogen polysiloxane is 15 parts by weight or less, based on 100 parts by weight of the 1-1 organohydrogen polysiloxane.

14. The silicone composition of claim 8, further comprising at least one of a tackifier, a reaction inhibitor, and a curing catalyst.

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