WO2019208756A1 - Gap sealant composition for display device, and method for manufacturing display device and display device using same - Google Patents

Abstract

[Problem] To provide a gap sealant composition for a display device that is fully applicable even with respect to display device designs which employ a narrow bezel width, that seals a gap between a bezel and a display panel in the display device, even if there is variation in such gap, with means that are efficient and easy to produce industrially, and that effectively suppresses optically clear resin (OCR) from penetrating into the display module from the gap, thereby making it possible to provide a high-quality, high-reliability display device and a method for manufacturing such a display device. [Solution] Provided is a gap sealant composition for a display device characterized: by being formed as a result of including (A) an organopolysiloxane with a curing-reactive functional group in the molecule and (B) a curing reaction catalyst; in that the initial viscosity at 25°C is in the range 100–100,000 mPa·s; and in that a non-liquid reactant is formed within 30 minutes at the same temperature. Also provided are: a method for manufacturing a display device characterized in that the gap sealant composition is used; and a display device obtained by this manufacturing method.

Description

Gap sealant composition for display device, method for producing display device using the same, and display device

The present invention relates to a gap sealant composition for a display device that can be suitably used for the purpose of filling a gap between a bezel and a display panel, particularly when manufacturing a display device such as a liquid crystal display device and a touch panel. A manufacturing method of a display device using the gap sealant composition for the display device, and a structure in which a gap between the bezel and the display panel is filled with the gap sealant composition The present invention also relates to a display device with further improved display quality and durability.

In recent years, display devices equipped with a front panel such as a touch panel or a decorative panel have been increasing for liquid crystal display modules as display devices. The touch panel is an input interface component. The decorative panel is tempered glass or the like printed for decoration from the viewpoint of design and display surface protection. These display devices are generally composed of a backlight unit, a display panel, a bezel and a front panel arranged so as to sandwich the bezel, and in recent years, with the miniaturization of display panels, diversification of installation locations and designs, There is a tendency to design narrower bezels.

When a front panel is mounted on a liquid crystal display module, an air layer usually exists between the surface of the liquid crystal panel and the front panel. Therefore, light is reflected at these interfaces due to the difference in refractive index between the front panel (for example, a glass substrate) and the air layer. Due to this interface reflection, the visibility of the displayed image is significantly reduced, particularly in an ambient light environment. On the other hand, an optical elastic resin having a refractive index close to the refractive index of the glass substrate of the front panel is filled in the air layer portion, and the liquid crystal panel and the front panel are bonded together to suppress interface reflection and display images. Technologies for improving visibility have been proposed. This full surface bonding technology is called optical-bonding or direct-bonding, and it is not only an optical effect but also a machine that prevents scattering and improves impact resistance when the front panel breaks. Because of its effects, it has been widely adopted.

In addition, even when the outer periphery of the rectangular front panel and the display module is bonded to each other with an air layer therebetween (hereinafter referred to as “air gap bonding” for the sake of convenience), the display quality deteriorates due to the entry of foreign matter into the display surface. Has become an issue. Therefore, in this case as well, there is a demand not only for simply attaching the front panel to the display module but also for improving the display quality by some means.

For example, in Patent Document 1 and Patent Document 2, a resin member (= dam material) is formed in a frame shape on the display module, and an optical elastic resin (hereinafter referred to as “OCR (Optically Clear Resin)”) is applied to the inside. , It is proposed to paste the front panel from above. In this case, the formation of the resin member is a so-called “blading purpose”, and in the optical carburizing, a dam-like resin member made of the same or similar material as the OCR is provided in the gap between the bezel and the display panel at the opening end. By forming the OCR, it is intended to prevent the OCR from penetrating into the display module from the gap.

However, when such a resin member is applied to the display area (pixel area), it is visually recognized as display unevenness, and in particular, it leads directly to deterioration of display quality at the end of the display surface. It is necessary to form it in a limited area on the light shielding film, and it is extremely difficult to carry out the screening with a large amount of dam material in an actual apparatus configuration.

Furthermore, the height of the gap between the bezel and the display panel varies due to the swell of the bezel, and the resin member covers the entire gap area before the resin member is temporarily cured with UV or the like in a large gap. It cannot be sealed and may be partially biased (this phenomenon is called “sink”). As a result, a normal resin member is not formed, and a gap remains between the resin member and the open end, and the OCR may penetrate into the display module from the gap. On the other hand, in a portion where the gap is small, the resin member itself may flow into and penetrate into the back side of the bezel before being temporarily cured with UV or the like. The OCR soaked inside the display module is not cured by UV light for curing, so it does not cure over time and spreads to all gaps in the display module, eroding the back of the display panel and the backlight shining surface. Cause display failure, or uncured OCR leaks from the display module, causing deterioration in appearance and product durability, and in the worst case, it cannot be used as a product (= deterioration in yield). Bring.

Further, in the means of Patent Document 2, since the second resin member formed so as to straddle the surface facing the front panel of the bezel is formed in addition to the first resin member, the bezel and the display panel In addition to the gap height variation, the protrusion of the resin member is formed on the bezel, and when placing the front panel on it, irregularities on the bezel surface and adhesion surface occur, resulting in poor appearance and display In the case of a defect, a touch panel, etc., it may cause poor contact at the end / deterioration of operation feeling. In addition to this, in particular, in the method of Patent Document 2, the resin member is formed so as to straddle the surface facing the front panel of the bezel, but a small amount of the resin member cannot sufficiently close the gap, If a large amount of resin material is used, the area of the resin material spreads beyond the limited area on the light-shielding film from the opening edge to the display area, and the original display area is eroded by the resin material, resulting in poor display. In recent years, there has been a tendency to design the bezel with a narrower width as the size of the display panel is reduced and the installation location and design are diversified. The light-shielding film region that can be applied also becomes narrow. As a result, as in Patent Document 2, it is difficult to design the gap sufficiently with a resin member that reaches the height of the bezel, or such a first resin member / second resin member is actually provided. However, depending on the design of the display panel, it may cause an unacceptable level of display unevenness depending on the display performance.

As described above, even when the width of the bezel is narrow, the gap between the bezel of the display device and the display panel is reliably filled to serve as a squint. Even when OCR is injected, the OCR is inserted into the display module from the gap. There is a strong demand for a gap sealant that can reliably prevent internal penetration.

JP 2010-066711 A JP 2016-164633 A

On the other hand, the present inventors discovered a new subject in the process of solving the said subject.

In designing a display device that adopts a narrow bezel width (that is, a narrow light-shielding film region) for placement in a small / space-saving trend, which is a recent trend, an attempt is made to reliably fill the gap between the display device bezel and the display panel. In this case, the present inventors have recalled that the resin member is injected into the gap between the bezel and the display panel using an L-shaped needle or the like. In this case, since the resin member that covers the gap is disposed below the bezel, it is effective that the OCR penetrates into the display module from the gap without causing display unevenness at the end of the display device. It is expected that a high-quality and high-reliability display device with improved display performance and durability, and a method for manufacturing the same can be provided.

However, when the above method is employed, it may be difficult to cure the curable resin that is the precursor of the resin member. For example, in Patent Document 1 or Patent Document 2, an ultraviolet curable resin is applied as a dam agent, and thereafter, the dam agent is cured by irradiating ultraviolet rays from a spot UV light source to form a resin member. However, as described above, when a resin member that covers the gap is to be disposed under the bezel, the curable resin is injected under the bezel, so that light is structurally easily blocked and sufficient ultraviolet rays or the like are irradiated. It may not be possible. In addition, since the timing at which the curable resin is injected under the bezel is inevitably after the display module is installed on the display module, in consideration of the effect of heat on the display module, heat curing at a high temperature is generally performed. Since it is difficult, it is desired to have low temperature curability such as room temperature. In addition, in order to inject the curable resin into a desired site, it is necessary to be in an uncured and liquid state, but if the curable resin injected under the bezel remains in a liquid state, As a result, the curable resin flows out of the gap and penetrates into the display module, so that not only the purpose of the glazing is not achieved but also a product defect may be caused. In addition, even if it remains under the bezel in an uncured and liquid state and does not soak into the display module, if the curable resin is in an uncured state, it cannot sufficiently fulfill the role of the weathering, When OCR is injected in a later process, it is impossible to prevent OCR from penetrating into the display module from the same gap.

As described above, when an attempt is made to fill the gap between the bezel of the display device and the display panel by injecting a curable resin into the gap, there is a concern that poor curing due to the structure and the manufacturing process may occur. Therefore, the present inventors fill the gap between the bezel of the display device and the display panel, which does not cause a problem of poor curing even when a curable resin is injected into the gap, or does not cause a problem of poor curing. As a result, a new problem has been recognized that a gap sealant composition suitable for the purpose is required.

In other words, the present invention has been made to solve the above-described problems, and even when injected under the bezel, it does not substantially cause a problem due to poor curing, and is arranged in a recent trend of small size / space saving. Therefore, it can be sufficiently applied to the design of a display device that adopts a narrow bezel width (that is, a narrow light-shielding film region), and even if there is a variation in the gap between the bezel and the display panel in the display device, Providing a gap sealant composition for a display device that enables opto-carbonization by OCR by striking the gap with an easy and efficient means and effectively suppressing the OCR from penetrating into the display module from the gap. It is something to try.

Furthermore, the present invention intends to provide a high-quality and high-reliability display device having improved display performance and durability by using the gap sealant composition for display device, and a method for producing the same. is there.

As a result of intensive studies, the present inventors have
[1] (A) one or more organopolysiloxanes having a curing reactive functional group in the molecule,
And (B) a liquid containing a curing reaction catalyst and having an initial viscosity at 25 ° C. in the range of 100 to 100,000 mPa · s, and forming a non-flowable reactant within at least 30 minutes at the same temperature. The present inventors have found that the above problems can be solved by a gap sealant composition for a display device characterized in that the present invention has been achieved.

Further, the present inventors have found that the above-mentioned problems can be suitably solved by the following composition from the viewpoint of composition design, and have reached the present invention.
[2] One or more organos selected from component (A) selected from (A1) organopolysiloxane having a curing reactive group containing a carbon-carbon double bond and (A2) organopolysiloxane having a condensation reactive group The gap sealant composition for a display device according to [1], comprising at least polysiloxane.
[3] Component (A) is
(A1) at least an organopolysiloxane having a curing reactive group containing a carbon-carbon double bond, and (A3) an organohydrogenpolysiloxane having a silicon atom-bonded hydrogen atom,
Component (B) is
(B1) at least a hydrosilylation reaction catalyst,
The display device according to [1] or [2], wherein a silicon-bonded hydrogen atom is in the range of 0.1 to 10 moles per mole of carbon-carbon double bonds in the composition. Gap sealant composition.
[4] Component (B) is
(B1-1) a first hydrosilylation reaction catalyst that shows activity in the composition without irradiation with high energy rays, and (B1-2) that does not show activity without irradiation with high energy rays, but has high energy A curing reaction catalyst comprising a second hydrosilylation reaction catalyst that is active in the composition upon irradiation with a ray, wherein the mass ratio of component (B1-1) to component (B1-2) is 90/10 to 5/95 Range of
When irradiated with high energy rays immediately after preparing the composition, it further has the characteristic of forming a non-flowable reactant within at least 20 minutes at 25 ° C.
[1] The gap sealant composition for a display device according to any one of [3].
[4-1] The gap sealant composition for a display device according to [4], wherein the high energy ray is ultraviolet light and the integrated irradiation dose at a wavelength of 365 nm is in the range of 100 mJ / cm ² to 10 J / cm ² .
[5] Component (A) is
(A1-1) 100 parts by mass of a linear or branched organopolysiloxane having an alkenyl group only at the molecular chain end,
(A1-2) An alkenyl group-containing organopolysiloxane having at least one branched siloxane unit in the molecule and having a vinyl (CH2═CH—) group content in the range of 1.0 to 5.0 mass% 0-20 parts by mass of resin,
(A3-1) A linear or branched organohydrogenpolysiloxane having a silicon-bonded hydrogen atom only at the molecular chain terminal, in a total of 1 mole of vinyl groups in the components (A1-1) and (A1-2) (A3-2) a linear or resinous organohydrogenpolysiloxane component having at least three silicon-bonded hydrogen atoms in the molecule (A3-2) A1) and an organopolysiloxane containing an amount of silicon-bonded hydrogen atoms of 0 to 1 mole per 1 mole of vinyl groups in (A1-2) [1] The gap sealant composition for a display device according to any one of [4] to [4].
[6] The component (B) is
(B1-1-1) an alkenylsiloxane complex of platinum, and (B1-2-1) (substituted and unsubstituted cyclopentadienyl) trimethylplatinum (IV), β-diketonatotrimethylplatinum (IV), bis ( β-diketonate) a curing reaction catalyst containing at least one selected from platinum (II), wherein the mass ratio of the component (B1-1-1) to the component (B1-2-1) is from 90/10 to The gap sealant composition for a display device according to any one of [1] to [5], which is in the range of 5/95.
[7] Component (A) contains (A2-1) one type or two or more types of organopolysiloxane having a condensation reactive group selected from a hydroxyl group, an alkoxy group, an acyloxy group, and an oximoxy group only at the molecular chain end. Organopolysiloxane
Component (B) contains (B2) a condensation reaction catalyst,
[1] The gap sealant composition for a display device according to any one of [6].
[8] The component (B) contains (B1-1-1) an alkenylsiloxane complex of platinum, and the platinum content derived from the component (B1-1-1) is in the range of 5 to 30 ppm of the entire composition. The gap sealant composition for a display device according to any one of [1] to [7].

In addition, the present inventors have found that the above-mentioned problems can be suitably solved by the following composition from the viewpoint of its usage and characteristics, and have reached the present invention.
[9] Any one of [1] to [8], wherein the display device is an image display device including a bezel and a display panel, and is used for the purpose of filling a gap between the bezel and the display panel. A gap sealant composition for a display device as described in 1. above.
[10] The gap sealant composition for a display device according to any one of [1] to [9], wherein the cone plate or parallel composition is prepared at 25 ° C. within 30 minutes after the preparation of the composition. A reaction material having a storage elastic modulus (G ′) measured at a frequency of 1 hertz using a plate-type dynamic viscoelasticity measuring device of 1000 Pa or more is formed.
[11] Any one of [1] to [10], wherein the initial viscosity at 25 ° C. is in the range of 100 to 100,000 mPa · s, and the fluidity is maintained for at least 3 minutes at the same temperature. A gap sealant composition for a display device according to claim 1.
[12] The gap sealant composition for a display device according to any one of [1] to [11], which gives a silicone cured product having a penetration of the cured product in the range of 5 to 70.
[13] The display according to any one of [1] to [12], which gives a silicone cured product having a shear adhesive strength of 0.05 MPa or more and a maximum adhesive strength and a displacement ratio with respect to the sample thickness of 1000% or more. A gap sealant composition for an apparatus.

Furthermore, the present inventor has found that the above problems can be suitably solved by the following display device manufacturing method and display device using the gap sealant composition for a display device described above, and has reached the present invention. .
[14] A display device comprising: a display panel having a display surface; and a bezel having a frame portion and an opening end inside the frame portion and covering the display panel side periphery of the display panel with the frame portion. A method of manufacturing
In at least a part or all of the entire circumference of the opening of the bezel, the gap between the bezel and the display panel is set to an angle at which an injection angle with respect to the gap is in a range of horizontal to 75 degrees [1] to [ 13] The manufacturing method of the display apparatus characterized by including the process of inject | pouring and filling the gap sealant composition for display apparatuses of any one of [13].
[15] A member having a function of filling the gap between the bezel and the display panel in a direction perpendicular to the display panel without gaps at least at one point or more of the entire circumference of the opening of the bezel. [14] The method for manufacturing a display device according to [14], wherein a step of injecting and filling the gap sealant composition after the placement is performed.
[16] a display panel having a display surface;
A bezel having a frame portion and an opening end inside the frame portion, and covering the periphery of the display panel side of the display panel with the frame portion;
14. The gap sealant composition for a display device according to any one of [1] to [13], wherein the gap between the bezel and the display panel is at least partly or entirely of the entire periphery of the opening of the bezel. A display device having a structure filled with a resin member obtained by curing an object.

According to the present invention, there is substantially no problem due to poor curing even when injected under the bezel, and a narrow bezel width (that is, a narrow light-shielding film) for placement in a compact / space-saving trend that is a recent trend. This can be applied sufficiently in the design of display devices adopting the area), and even if there is a variation in the gap between the bezel and the display panel in the display device, this gap is surely secured by an easy and efficient means for industrial production. It is possible to provide a gap sealant composition for a display device that can be closed and that effectively suppresses OCR from penetrating into the display module from the same gap and enables optocarbonization by OCR. Furthermore, by using the gap sealant composition for a display device, it is possible to provide a high-quality and high-reliability display device with improved display performance and durability, and a method for manufacturing the display device.

3 is a partial cross-sectional view illustrating the display device of Embodiment 1. FIG. 1 is an exploded perspective view showing a display device of Embodiment 1. FIG. FIG. 3A is a partial cross-sectional view illustrating a manufacturing process in which a resin member is injected from the horizontal direction into the gap 72 of the display module according to the first embodiment using an L-shaped nozzle. FIG. 3B is a partial cross-sectional view showing a structure in which the gap of the display module in Embodiment 1 is filled in the vertical direction with a resin member by horizontal injection. 4A is a resin for the purpose of filling the gap 72 in the vertical direction in advance because it suppresses the variation in the size of the gap 72 of the display module in Embodiment 1 and is used as the starting point / end point of the curable resin to be injected later. It is a fragmentary sectional view which shows the state which has arrange | positioned the member. FIG. 4B is a partial cross-sectional view illustrating a state in which a resin member is injected into the gap 72 of the display module in Embodiment 1 in advance in order to fill the gap 72 in the vertical direction and the gap 72 is adjusted in the vertical direction. FIG. 5 is a partial cross-sectional view showing a manufacturing process in which a resin member is injected from the vertical direction into the gap 72 of the display module in the comparative embodiment using a nozzle.

[Gap sealant composition for display device]
First, the gap sealant composition for display devices of the present invention will be described.

In the present invention, “room temperature” or “room temperature” is 25 ° C.

In the present invention, the “reactant” is a thickened body, a solid or a semi-solid material formed as a result of the progress of a curing reaction between the components of the liquid gap sealant composition. In particular, thermoplastic solids that exhibit fluidity when heated to solid, elastic solids, and heat (eg, heating at 100 ° C. or higher) but are non-flowable at 25 ° C. are included. Furthermore, these reactants may be cured reactants in which the curing reaction is substantially completed, and have two or more stages of multi-curability (particularly, including secondary curability and tertiary curability). The reaction product may be a curing reaction product, or a semi-cured product in the course of the curing reaction. That is, the “reacted product” in the present invention is a cured product in which the curing reaction is substantially completed, at least one stage of curing reaction is substantially completed, but a cured product having further curing reactivity, cured It may be any semi-cured product in which the reaction is not substantially completed but thickening or solidification is in progress. Moreover, the said semi-hardened | cured material may be equipped with the multi-stage curability of 2 steps or more. The scale of the display device, which is one of the main technical effects of the present invention, depends on the fluidity of the liquid composition at room temperature and in a short time regardless of the degree of the curing reaction and the presence or absence of multi-curability of the reactant. This is because it is realized by a change in physical properties.

In the present invention, “non-flowable” means that it is not at least liquid and does not substantially deform or flow in an unloaded state, and preferably does not deform or flow in an unloaded state at 25 ° C. Means that. Such a reactant preferably has a storage elastic modulus (G ′) of 1000 Pa or more measured at a frequency of 1 hertz using a cone plate or parallel plate type dynamic viscoelasticity measuring apparatus. In addition, in the reactant having non-fluidity, as a result of the progress of thickening or curing, a gel-like or solid (including elastic body and thermoplastic) reactant is formed, and the viscosity of the reactant It is preferable that the measurement is substantially difficult. In the present invention, if the reactant is non-flowable, at least one stage of curing reaction may not be substantially completed, and if the fluidity is lost due to surface thickening or curing, The curing reaction does not have to proceed in the deep part. This is because, if the reactant is non-fluid, the scale of the display device, which is one of the main technical effects of the present invention, is achieved.

In the present invention, the “initial viscosity” is a mixed viscosity of the entire composition immediately after the composition is prepared by mixing each component, and can be measured using a rheometer or the like. That is, the gap sealant composition for a display device according to the present invention is a multi-component type composition (particularly including a two-component type) prepared by mixing each component before use. Preferably, immediately after mixing of the multi-components, it is liquid and in a certain viscosity range, so that it can be injected into the gap of the display device.

The gap sealant composition for a display device of the present invention comprises (A) one or more types of organopolysiloxane having a curing reactive functional group in the molecule,
And (B) a liquid containing a curing reaction catalyst and having an initial viscosity at 25 ° C. in the range of 100 to 100,000 mPa · s, and forming a non-flowable reactant within at least 30 minutes at the same temperature. It is characterized by doing.

The composition of the present invention is characterized by its curing profile. That is, immediately after mixing each component, the initial viscosity at 25 ° C. is in the range of 100 to 100000 mPa · s. Therefore, using a dispenser equipped with an L-shaped nozzle / needle, etc. Can be injected into the gap between the bezel and the display panel, while forming a non-flowable reactant at 25 ° C. within at least 30 minutes to achieve the void-clad or fast-curing curing. It has a profile.

If the initial viscosity is within the above range, it will realize sufficient handling workability as a gap sealant composition for a display device. From this viewpoint, the initial viscosity may be in the range of 500 to 50000 mPa · s, more preferably in the range of 750 to 30000 mPa · s, and particularly preferably in the range of 1000 to 25000 mPa · s in practice. If the initial viscosity is less than the lower limit, even in a fast-curing or quick-drying curing profile, the fluidity is high, so that there are cases where outflow to the display module side after injection or in particular poor filling in the vertical direction may occur. . On the other hand, if the initial viscosity exceeds the upper limit, thickening / curing may proceed excessively during the pouring operation, and sufficient pot life in the pouring process may not be ensured.

Forming a non-flowable reactant within 30 minutes means that another curing operation (for example, for example, at room temperature, starting from the time immediately after the composition according to the present invention is prepared by mixing operation or the like (= 0 minutes)). At least one stage of curing reaction until the liquid composition becomes a non-flowable reactant after at least 30 minutes, without performing ultraviolet irradiation, heating, and other curing operations). Means that it is progressing. In addition, the composition may be a non-fluid reactant at any time before 30 minutes (for example, 15 minutes, 20 minutes, 25 minutes, etc.), and after 30 minutes or more. Further, the curing reaction may proceed.

The composition according to the present invention is further a reaction product comprising the same composition after at least 30 minutes from the time point immediately after the composition according to the present invention is prepared by mixing operation or the like (= 0 minute). However, it is particularly preferable that the storage elastic modulus (G ′) measured at a frequency of 1 hertz using a cone plate or parallel plate type dynamic viscoelasticity measuring apparatus is 1000 Pa or more.

The time required for the composition according to the present invention to be in the state of a non-flowable reactant or the above storage elastic modulus (G ′) to reach a value of 1000 Pa or more depends on the components (A) and (B ) Can be designed or controlled by appropriately selecting the type and amount of the composition or by selecting the type and amount of an inhibitor for the curing system of the composition (for example, a curing inhibitor for the curing system including a hydrosilylation reaction). It is. For example, when the curing reaction proceeds in the presence of component (B) at room temperature in the presence of component (A), the amount of component (B) is increased and no inhibitor for component (B) is added, or until injection By setting the minimum amount to ensure the pot life, it is possible to design a fast-curing or quick-drying curing profile of the composition.

Further, as described above, the composition according to the present invention needs to maintain a liquid state and ensure a pot life in the step of injecting into the gap of the display device, particularly the gap between the bezel and the display panel. The timing at which the composition according to the present invention is formed can be selected, for example, by storing the composition in a multi-component form such as two liquids and mixing it at the time of injection. For example, each component may be mixed with a mixer or the like immediately before injection, loaded into a dispenser within the pot life, and injected into a desired site. In this case, since the time of mixing becomes the starting point (= 0 minutes) of the curing reaction that forms the above-mentioned non-flowable reactant, depending on the process and the injection operation time, at least within 3 minutes after mixing, Preferably, no non-flowable reactant is formed within 5 minutes. In this way, by designing a composition that has a fast-curing or quick-drying curing profile while ensuring sufficient pot life at room temperature, problems such as clogging during liquid injection and defective discharge occur. There is an actual advantage that the present invention can be smoothly implemented.

On the other hand, in carrying out the present invention, a dispenser having a liquid raw material tank physically provided with a partition and a mechanism for mixing a predetermined amount of liquid raw material supplied from each raw material tank to the discharge unit may be used. . By using such a dispenser having a tank mechanism and a mixing mechanism that can separate and load the raw material liquid, each component of the composition according to the present invention is loaded into a physically partitioned tank, It is also possible to mix and discharge a certain amount at the time of dispensing. In this case, since the composition can be formed and injected into a desired site so that the time lag between discharge and mixing is virtually zero, even if the pot life of the composition after mixing is short The composition and the method for producing a display device according to the present invention can be carried out without any problem. That is, since the composition according to the present invention can select the mixing means and the timing of injection, securing the pot life at room temperature is an optional factor. A dispenser having such a structure is commercially available. For example, a dispenser in which a discharge nozzle is provided in a plastic double cartridge manufactured by MIX-PAC can be exemplified.

Next, the composition concerning this invention contains the following component (A) and component (B).

Component (A) is one or more organopolysiloxanes having a curing reactive functional group in the molecule, and may include any of the following organopolysiloxanes or a combination thereof.
An organopolysiloxane having one or more kinds of curing reactive functional groups in the molecule;
Two or more types of organopolysiloxanes having different curing reactive functional groups,
Two or more types of organopolysiloxanes having the same curing reactive functional group but different from each other in any of the bonding site, content, and siloxane skeleton

Examples of the curing reactive functional group of component (A) include any curing reactive functional group such as a hydrosilylation reactive group, a radical reactive group, a condensation reactive functional group, and in particular, a carbon-carbon double bond. Preferred examples thereof include hydrosilylation reactive groups or radical reactive groups; hydrosilylation reactive groups that are silicon-bonded hydrogen groups; and condensation reactive groups selected from hydroxyl groups, alkoxy groups, acyloxy groups, and oximoxy groups. The radical reactive group includes a high energy ray reactive group such as ultraviolet rays. Component (A) according to the present invention may be an organopolysiloxane containing one kind of curing reactive group in the molecule, or an organopolysiloxane containing two or more different kinds of curing reactive groups in the molecule. Alternatively, it may be a mixture of organopolysiloxanes different from each other in the kind of curing reactive functional group / bonding site / content / siloxane skeleton.

As the component (A) according to the present invention, particularly preferably,
(A1) an organopolysiloxane having a curing reactive group containing a carbon-carbon double bond,
(A2) Organopolysiloxane having a condensation reactive group, and (A3) organohydrogenpolysiloxane having a silicon atom-bonded hydrogen atom are exemplified, and one or more kinds of organos selected from component (A1) and component (A2) A composition containing at least polysiloxane is preferred in the present invention. Here, the composition containing the component (A1) is cured by a hydrosilylation reaction or a radical reaction. On the other hand, the composition containing the component (A2) is cured by a condensation reaction.

The component (A) of the composition according to the present invention is preferably hydrosilylation reaction curable, and an organopolysiloxane mixture containing both the component (A1) and the component (A3) is preferable.

Component (A1) is an organopolysiloxane having a curing reactive group containing a carbon-carbon double bond, vinyl group, allyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, C2-C20 alkenyl group such as decenyl group, undecenyl group, dodecenyl group; acrylic-containing group such as 3-acryloxypropyl group, 4-acryloxybutyl group; 3-methacryloxypropyl group, 4-methacryloxybutyl Examples thereof include linear, branched, cyclic, or resinous (network-like) organopolysiloxanes containing a curing reactive group selected from methacryl-containing groups such as groups in the molecule. In particular, an organopolysiloxane having a curing reactive group containing a carbon-carbon double bond selected from a vinyl group, an allyl group or a hexenyl group is preferred.

The organopolysiloxane as the component (A1) may contain a group selected from a monovalent hydrocarbon group, a hydroxyl group and an alkoxy group having no carbon-carbon double bond in the molecule. Moreover, in the monovalent hydrocarbon group, a part of the hydrogen atoms may be substituted with a halogen atom or a hydroxyl group. Examples of such monovalent hydrocarbon groups include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl and the like. Alkyl group; phenyl group, tolyl group, xylyl group, naphthyl group, anthracenyl group, phenanthryl group, pyrenyl group and other aryl groups; benzyl group, phenethyl group, naphthylethyl group, naphthylpropyl group, anthracenylethyl group, phenane An aralkyl group such as a tolylethyl group or a pyrenylethyl group; and a hydrogen atom of these aryl groups or aralkyl groups; an alkyl group such as a methyl group or an ethyl group; an alkoxy group such as a methoxy group or an ethoxy group; a chlorine atom or a bromine atom; And a group substituted with a halogen atom. In addition, when a component (A1) contains a hydroxyl group etc., the said component has condensation reactivity in addition to hydrosilylation reaction curability.

Preferably, component (A1) has the following average composition formula:
R ¹ _a R ² _b SiO _{(4-ab) / 2}
Or a mixture thereof.
Wherein R ¹ is a curing reactive group containing the above carbon-carbon double bond,
R ² is a group selected from a monovalent hydrocarbon group having no carbon-carbon double bond, a hydroxyl group and an alkoxy group,
a and b are numbers satisfying the following conditions: 1 ≦ a + b ≦ 3 and 0.001 ≦ a / (a + b) ≦ 0.33, preferably, the following conditions: 1.5 ≦ a + b ≦ 2.5 and It is a number that satisfies 0.005 ≦ a / (a + b) ≦ 0.2. This is because the flexibility of the cured product is increased when a + b is not less than the lower limit of the above range, and the mechanical strength of the cured product is increased when it is not more than the upper limit of the above range. This is because when (a + b) is equal to or higher than the lower limit of the above range, the mechanical strength of the cured product is increased, and when it is equal to or lower than the upper limit of the above range, the flexibility of the cured product is increased.

In the composition according to the present invention, particularly preferably, the component (A1) is
Component (A1) is
(A1-1) a linear or branched organopolysiloxane having an alkenyl group only at the molecular chain end, and (A1-2) optionally having at least one branched siloxane unit in the molecule, An alkenyl group-containing organopolysiloxane resin having a CH2 = CH-) group content in the range of 1.0 to 5.0% by mass is included.

Component (A1-1) has (Alk) R ² ₂ SiO _{1/2 at the} molecular chain end.
(Wherein Alk is an alkenyl group having 2 or more carbon atoms), and the other siloxane units are substantially composed only of siloxane units represented by R ² ₂ SiO _2/2. It is a linear or branched organopolysiloxane. R ² represents the same group as described above. Further, the degree of siloxane polymerization of the component (A1-1) is in the range of 7 to 1002, including the terminal siloxane unit. Such component (A1-1) is particularly preferably a linear organopolysiloxane in which both ends of the molecular chain are blocked with siloxane units represented by (Alk) R ² ₂ SiO _1/2. is there.

Component (A1-2) is an alkenyl group-containing organopolysiloxane resin,
Average unit formula:
(RSIO _3/2 ) o (R ₂ SiO _2/2 ) p (R ₃ SiO _1/2 ) q (SiO _4/2 ) r (XO _1/2 ) s
The alkenyl group containing organopolysiloxane resin represented by these is illustrated.
In the above formula, R is a group selected from an alkenyl group and the monovalent hydrocarbon group having no carbon-carbon double bond, and X is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. However, among all R, R is an alkenyl group in a range where the content of vinyl (CH2═CH—) group in the organopolysiloxane resin satisfies the range of 1.0 to 5.0% by mass. In particular, at least a part of R on the siloxane unit represented by RSiO _1/2 is preferably an alkenyl group.

Where (o + r) is a positive number, p is 0 or a positive number, q is 0 or a positive number, s is 0 or a positive number, and p / (o + r) is 0 to 10 Q / (o + r) is a number in the range 0-5, (o + r) / (o + p + q + r) is a number in the range 0.3-0.9, and s / (o + p + q + r) is a number in the range of 0 to 0.4.

As component (A1-2), particularly preferably,
{(Alk) R ² ₂ SiO _1/2 } q1 (R ² ₃ SiO _1/2 ) q2 (SiO _4/2 ) r
(Wherein Alk and R ² are the same groups as described above, q1 + q2 + r is a number in the range of 50 to 500, (q1 + q2) / r is a number in the range of 0.1 to 2.0, and q2 is (The number of vinyl (CH2 = CH-) groups in the organopolysiloxane resin is in a range satisfying the range of 1.0 to 5.0% by mass)
The alkenyl group containing MQ organopolysiloxane resin represented by these is illustrated.

By using together the component (A1-1) having an alkenyl group only at the molecular chain terminal and the component (A1-2) which is an organopolysiloxane resin having a certain amount of alkenyl group, the composition as a whole can be cured quickly. It is possible to provide a gap sealant composition for a display device that is excellent in properties / fast drying properties, gives a cured reaction product excellent in mechanical strength and flexibility, and is particularly suitable for gap seal applications in display devices.

Component (A3) is an organohydrogenpolysiloxane having silicon-bonded hydrogen atoms, and preferably has at least two silicon-bonded hydrogen atoms in the molecule and functions as a crosslinking agent for component (A1). It is an ingredient.

As such component (A3), 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, tris (dimethylhydrogensiloxy) methylsilane, tris (dimethylhydrogen) Siloxy) phenylsilane, trimethylsiloxy group-capped methylhydrogen polysiloxane with molecular chain at both ends, trimethylsiloxy group-capped dimethylsiloxane / methylhydrogensiloxane copolymer with molecular chain at both ends, dimethylhydrogensiloxy group-capped dimethylpoly with molecular chain at both ends Siloxane, molecular chain both ends dimethylhydrogensiloxy group-blocked dimethylsiloxane / methylhydrogensiloxane copolymer, molecular chain both ends trimethylsiloxy group-blocked methylhydrogensiloxane / diphenylsiloxane copolymer, It consists of a trimethylsiloxy group-blocked methylhydrogensiloxane / diphenylsiloxane / dimethylsiloxane copolymer, hydrolyzed condensate of trimethoxysilane, (CH ₃ ) ₂ HSiO _1/2 unit and SiO _4/2 unit. Examples include copolymers, copolymers composed of (CH ₃ ) ₂ HSiO _1/2 units, SiO _4/2 units, and (C ₆ H ₅ ) SiO _3/2 units, and mixtures of two or more thereof. The

In the composition according to the present invention, particularly preferably, the component (A3) is
(A3-1) a linear or branched organohydrogenpolysiloxane having a silicon-bonded hydrogen atom only at the molecular chain end, and optionally (A3-2) at least three silicon-bonded hydrogen atoms in the molecule A linear or resinous organohydrogenpolysiloxane having the following formula is included.

Component (A3-1) is an organohydrogenpolysiloxane having a silicon-bonded hydrogen atom only at the molecular chain end, and functions as a chain extender in the hydrosilylation reaction with component (A1), and is a cured reaction product. It is a component that improves the flexibility. Such component (A3-1) is preferably a linear organohydrogenpolysiloxane, and those represented by the following structural formula can be preferably used.
HMe ₂ SiO (Ph ₂ SiO) _m1 SiMe ₂ H
HMe ₂ SiO (Me ₂ SiO) _m1 SiMe ₂ H
HMePhSiO (Ph ₂ SiO) _m1 SiMePhH
HMePhSiO (Me ₂ SiO) _m1 SiMePhH
HMePhSiO (Ph ₂ SiO) _m1 (MePhSiO) _n1 SiMePhH
HMePhSiO (Ph ₂ SiO) _m1 (Me ₂ SiO) _n1 SiMePhH
In the above formula, Me and Ph represent a methyl group and a phenyl group, respectively, m1 is a number from 1 to 100, and n1 is a number from 1 to 50.

Component (A3-2) is a linear or resinous organohydrogenpolysiloxane having at least three silicon-bonded hydrogen atoms in the molecule. When used in combination with component (A3-1) above, It is a component that realizes rapid curability in the composition.

As linear organohydrogenpolysiloxanes, trimethylsiloxy group-capped methylhydrogen polysiloxanes at both molecular chain ends, trimethylsiloxy group-capped dimethylsiloxane / methylhydrogensiloxane copolymers with both molecular chain terminals, and dimethylhydrol at both molecular chain terminals. Gensiloxy group-blocked dimethylsiloxane / methylhydrogensiloxane copolymer, molecular chain both ends trimethylsiloxy group-blocked methylhydrogensiloxane / diphenylsiloxane copolymer, molecular chain both ends trimethylsiloxy group-blocked methylhydrogensiloxane / diphenylsiloxane, A dimethylsiloxane copolymer is exemplified.

On the other hand, the resinous organohydrogenpolysiloxane comprises at least a branched siloxane unit selected from an SiO _4/2 unit (Q unit) and an R ³ SiO _3/2 unit (T unit), and R ³ ₃ SiO _{1 / 2} units (M units), R ³ ₂ HSiO _1/2 units ( ^MH units), and optionally R ³ ₂ SiO _1/2 units (D units), R ³ HSiO _1/2 units ( ^DH units) Comprising
M ^H MQ type, M ^H Q type, M ^H MT type, M ^H T type, M ^H MQT type, M ^H QT type, M ^H MDQ type, M ^H MDD ^H Q type, M ^H DQ type, M ^H DD ^H Q type, ^MH MDT type, ^MH MDD ^H T type, ^MH DT type, ^MH DD ^H T type, ^MH MDQT type, ^MH MDD ^H QT type, ^MH DQT type, ^MH DD ^H QT One or more types of organohydrogenpolysiloxane resins selected from molds are exemplified.
In the formula, R ³ is a methyl group or a phenyl group.

In the composition according to the present invention, the content of component (A3) is preferably such that the number of silicon-bonded hydrogen atoms in the composition is preferably 0 with respect to 1 mole of carbon-carbon double bonds in component (A1). The amount is in the range of 1 to 10 mol, preferably in the range of 0.2 to 5.0 mol, particularly preferably in the range of 0.5 to 2.0 mol. Amount. If the content of the component (A3) is below the lower limit, it may cause poor curing. If the content of the component (A3) exceeds the upper limit, the mechanical strength of the cured product becomes too high, and the elastic body or A gel-like cured reaction product may not be obtained.

In the composition according to the present invention, the gap sealability in the display device, in particular, from the viewpoint of the normal balance between the fast curing / fast drying property and the cured product, the component (A) is particularly preferably
With respect to component (A1) containing 100 parts by weight of the above component (A1-1) and 0 to 20 parts by weight of the above component (A1-2),
Component (A3-1) An amount such that silicon-bonded hydrogen atoms are 0.1 to 10 moles relative to a total of 1 mole of vinyl groups in components (A1-1) and (A1-2), preferably An amount of 0.2 to 5.0 mol, more preferably an amount of 0.5 to 2.0 mol, and the above component (A3-2) components (A1-1) and (A1-2) The amount of silicon-bonded hydrogen atoms is 0 to 1 mol, preferably 0 to 0.5 mol, more preferably 0.1 to 0.5 mol with respect to 1 mol of the total vinyl groups therein. It contains an organopolysiloxane in a molar amount.

In the composition according to the present invention, the component (A) may be (A2) an organopolysiloxane having a condensation reactive group, and in particular, a condensation selected from the above hydroxyl group, alkoxy group, acyloxy group, and oximoxy group. It may be an organopolysiloxane (A2-1) containing one or more types of organopolysiloxane having a reactive group only at the molecular chain end. Such a condensation-reactive component (A2) may be used in combination with a hydrosilylation-reactive organopolysiloxane such as the above-mentioned component (A1), and a large amount of condensation reaction catalyst is used as the curing agent (B) described later. By the composition design such as, the quick curing / quick drying curing profile necessary for the present invention may be designed only by the component (A2).

Component (B) is a curing reaction catalyst, and is a component that causes the curing reaction to proceed with respect to the curing reactive functional group of component (A). Examples of such component (B) include a hydrosilylation reaction catalyst, a photopolymerization initiator, a peroxide, or a condensation reaction catalyst. For convenience of use as a gap sealant composition for a display device, Since it is often difficult to irradiate a large amount of high energy rays, it is preferable to include a hydrosilylation reaction catalyst or a condensation reaction catalyst.

(B1) In the hydrosilylation reaction catalyst, the component (A) includes the component (A1), preferably both the component (A1) and the component (A2), and is cured by a hydrosilylation reaction. In the case of having a group, it is a component that causes a curing reaction to proceed.
(B1-1) a first hydrosilylation reaction catalyst that shows activity in the composition without irradiation with high energy rays, and optionally (B1-2) shows no activity without irradiation with high energy rays. A curing reaction catalyst comprising a second hydrosilylation reaction catalyst that is active in the composition by irradiation with high energy rays, wherein the mass ratio of the component (B1-1) to the component (B1-2) is 100/0 Those in the range of ~ 5/95 are preferred.

Here, examples of the high energy rays include ultraviolet rays, X-rays, and electron beams. Among these, ultraviolet rays are preferable from the viewpoint of efficiency of catalyst activation. The irradiation amount varies depending on the type of the high energy ray active catalyst, but in the case of ultraviolet rays, the integrated irradiation amount at a wavelength of 365 nm is preferably within a range of 100 mJ / cm 2 to 10 J / cm 2.

Component (B1-1) is the first hydrosilylation catalyst that shows activity in the present composition without irradiation with high energy rays. The component is a hydrosilylation reaction catalyst that gives a fast curing / fast drying curing profile necessary for the composition when it contains no hydrosilylation reaction inhibitor or in a small amount. Examples include rhodium-based catalysts, palladium-based catalysts, nickel-based catalysts, iridium-based catalysts, ruthenium-based catalysts, and iron-based catalysts, and platinum-based catalysts are preferred. Platinum-based compounds such as platinum fine powder, platinum black, platinum-supported silica fine powder, platinum-supported activated carbon, chloroplatinic acid, chloroplatinic acid alcohol solution, platinum olefin complex, platinum alkenylsiloxane complex, etc. In particular, platinum alkenylsiloxane complexes are preferred. Examples of the alkenylsiloxane include 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, Examples thereof include alkenyl siloxanes in which part of the methyl groups of these alkenyl siloxanes are substituted with ethyl groups, phenyl groups, and the like, and alkenyl siloxanes in which the vinyl groups of these alkenyl siloxanes are substituted with allyl groups, hexenyl groups, and the like. In particular, 1,3-divinyl-1,1,3,3-tetramethyldisiloxane is preferred because the stability of this platinum-alkenylsiloxane complex is good. Further, since the stability of the platinum-alkenylsiloxane complex can be improved, 1,3-divinyl-1,1,3,3-tetramethyldisiloxane and 1,3-diallyl-1,1 are added to this complex. , 3,3-tetramethyldisiloxane, 1,3-divinyl-1,3-dimethyl-1,3-diphenyldisiloxane, 1,3-divinyl-1,1,3,3-tetraphenyldisiloxane, It is preferable to add an alkenyl siloxane such as 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane or an organosiloxane oligomer such as a dimethylsiloxane oligomer. It is preferable.

Component (B1-1) is a catalyst that shows activity without irradiation with high energy rays, and among them, a catalyst that shows activity even at a relatively low temperature is preferable. Specifically, it exhibits activity in the composition in the temperature range of 0 to 200 ° C., and accelerates the hydrosilylation reaction. The content of component (B1-1) varies depending on the type of catalyst and the type of composition, but usually the metal atoms in the catalyst are within the range of 0.01 to 50 ppm by mass relative to the composition. In particular, the (B1-1-1) platinum alkenylsiloxane complex is used so that the platinum content is preferably in the range of 1.5 to 30 ppm. / It is particularly preferable from the viewpoint of quick drying. If the amount of component (B1-1) added is too small, the object of the present invention of fast curability cannot be achieved. If the amount added is too large, the pot life is too short, resulting in practical inconveniences. It is an economy.

Component (B1-2) is a second hydrosilylation catalyst that exhibits activity in the present composition when irradiated with high energy rays, but does not exhibit activity without irradiation with high energy rays. The so-called activating catalyst or photoactivated catalyst.

Specific examples of component (B1-2) include (methylcyclopentadienyl) trimethylplatinum (IV), (cyclopentadienyl) trimethylplatinum (IV), (1,2,3,4,5-pentamethyl (Cyclopentadienyl) trimethylplatinum (IV), (cyclopentadienyl) dimethylethylplatinum (IV), (cyclopentadienyl) dimethylacetylplatinum (IV), (trimethylsilylcyclopentadienyl) trimethylplatinum (IV), (Methoxycarbonylcyclopentadienyl) trimethylplatinum (IV), (dimethylphenylsilylcyclopentadienyl) trimethylcyclopentadienylplatinum (IV), trimethyl (acetylacetonato) platinum (IV), trimethyl (3,5- Heptanedionate) platinum (IV), trimethyl (methylacetate) Cetate) platinum (IV), bis (2,4-pentanedionato) platinum (II), bis (2,4-hexanedionato) platinum (II), bis (2,4-heptandionato) platinum (II), Bis (3,5-heptanedionato) platinum (II), bis (1-phenyl-1,3-butanedionato) platinum (II), bis (1,3-diphenyl-1,3-propanedionato) platinum (II) Bis (hexafluoroacetylacetonato) platinum (II), among which (methylcyclopentadienyl) trimethylplatinum (IV) and bis (2,4-pentanedionato) platinum (II) are widely used It is preferable from the point of property and availability.

The component (B1-2) is an optional component in the present composition, but the reaction product obtained by the component (B1-1) is subjected to secondary curability (hereinafter referred to as “photocuring” by irradiation with high energy rays. In addition, it is possible to provide sufficient light irradiation, particularly under the bezel, by simultaneously irradiating with high energy rays in the presence of the component (B1-1). In addition to the non-fluid reactant, the curing reaction can proceed further in the non-fluid region, and further curing reaction can proceed, and further faster curing / fast drying compared to (B1-1) alone. Can be realized. The content thereof is an amount necessary to further cure the composition to the reaction product obtained by the component (B1-1) or an amount sufficient to improve fast curability / fast dryness, preferably The amount of the metal atom in the catalyst is in the range of 1 to 50 ppm, preferably in the range of 5 to 30 ppm, with respect to the present composition.

In such a composition design having photocurability, the mass ratio of the component (B1-1) to the component (B1-2) is preferably in the range of 90/10 to 5/95, and 85/15 A range of ˜10 / 90 is more preferred. If the mass ratio is less than or equal to the upper limit, the curing reaction can be accelerated by irradiation with high energy rays, and if the mass ratio is less than the lower limit, the curing reaction at a low temperature such as room temperature in a short time does not proceed. That is, the fast curing / fast drying curing profile required for the composition may not be realized. In addition, among high energy ray irradiation, ultraviolet irradiation can be performed by irradiating the periphery of the composition after inject | pouring into the space | gap of a display apparatus using a spot UV light source, for example.

When the component (B1-2), the hydrosilylation catalyst that is a high energy ray activation catalyst or a photoactivation catalyst, is included, the composition according to the present invention was irradiated with a high energy ray immediately after the composition was prepared. In some cases, it can be designed to further have the characteristic of forming a non-flowable reactant within at least 20 minutes at 25 ° C. Even when such a composition is injected under a bezel or the like where it is difficult to efficiently irradiate high energy rays, the composition can be further rapidly irradiated with light using a spot UV light source or the like. It is extremely useful when using the gap sealant composition for a display device according to the present invention in that it can realize excellent curability and quick drying. In the composition of the present invention, the irradiation timing and irradiation amount of the high energy beam are arbitrary, and when using the actual composition, the high energy beam may be irradiated immediately after the preparation, or after a certain time, Needless to say, high energy rays may be irradiated. Further, the practical irradiation amount and the irradiation amount for defining the above-mentioned characteristics are as described above, but the actual use is not limited to this.

The composition according to the present invention preferably does not contain a hydrosilylation reaction inhibitor. Usually, in order to improve the pot life of the composition and obtain a stable composition, a hydrosilylation reaction inhibitor is added to the composition. However, in the present invention, the composition can be obtained by adding a hydrosilylation reaction inhibitor. This is because it is preferable that the curing reaction of the product is not delayed. However, for the purpose of securing the pot life in the injection step, a necessary minimum amount of hydrosilylation reaction inhibitor may be added.

In the composition according to the present invention, when the component (A) has a condensation reactive group, the component (B) may contain (B2) a condensation reaction catalyst. Such a catalyst for the condensation reaction is not limited, and examples thereof include organic tin compounds such as dibutyltin dilaurate, dibutyltin diacetate, tin octenoate, dibutyltin dioctate, tin laurate; tetrabutyl titanate, tetrapropyl titanate, dibutoxybis ( Organic titanium compounds such as ethyl acetoacetate; other acidic compounds such as hydrochloric acid, sulfuric acid and dodecylbenzenesulfonic acid; alkaline compounds such as ammonia and sodium hydroxide; 1,8-diazabicyclo [5.4.0] undecene (DBU) ) An amine compound such as 1,4-diazabicyclo [2.2.2] octane (DABCO) is exemplified, and an organic tin compound and an organic titanium compound are preferable.

The amount of component (B2) used is that required to give the composition a fast cure / fast dry cure profile required. The component (B2) can be used arbitrarily as long as the component (B1) can achieve the required fast curing / drying curing profile. However, when the component (B2) is used in combination, the reaction is particularly effective. Curing in the deep part of the object may progress with time, and the eye-tightening effect may be further improved as a gap filler composition of a display device.

In the composition according to the present invention, if necessary, other organopolysiloxanes, adhesion-imparting agents, inorganic fillers such as silica, glass, alumina, and zinc oxide; fine organic resin powders such as polymethacrylate resins; A phosphor, a heat-resistant agent, a dye, a pigment, a flame retardant, a solvent and the like are added to the organopolysiloxane composition used in the present invention. The amount of addition and its method are known to those skilled in the art.

Since the composition according to the present invention has a fast-curing / fast-drying curing profile, it is preferably a multi-component composition of two or more components. In particular, when the component (A) is a hydrosilylation reaction-curable organopolysiloxane and includes the component (A1) and the component (A3), a multicomponent type of two or more components in which these components are different packages is used. It is preferable to handle it as a composition and mix it immediately before use, or inject it into the gap of the target display device using a dispenser equipped with a mixing mechanism as described above.

More specifically, the present composition can be produced by uniformly mixing the above component (A), component (B), and other optional components as necessary at room temperature.

Particularly preferably, the composition is preferably a two-component (= 2 liquid) composition having at least hydrosilylation reaction curability,
The component I component contains at least the aforementioned component (A1) and component (B), and optionally includes other components,
The II liquid component contains at least the component (A2),
Each can be stored for a long period of time by being sealed in a sealed container at room temperature. As described above, immediately after mixing them, it has a liquid and constant initial viscosity and has a fast curing / fast drying curing profile.

One feature of the present invention is that the composition is used as a gap sealant composition for a display device. In particular, the display device is an image display device including a bezel and a display panel. It is preferable to use the composition for the purpose of filling the gap with the display panel. In addition, the use for the said objective is the silicone which hardens this composition as a member which has a function which fills the said space | gap with the space | interval between the said bezel and a display panel perpendicularly | vertically with respect to a display panel. This includes using a resin member.

The composition according to the present invention is preferably cured to form an elastomer (elastic body) resin member or a gel-like resin member. The cured silicone resin member is defined by JIS K2220 at 25 ° C. The penetration (hereinafter simply referred to as “penetration”) is preferably in the range of 5 to 70, more preferably in the range of 10 to 60 and in the range of 20 to 50. . Such a silicone resin member has moderate flexibility and durability, and is excellent in adhesion / adhesion retention and followability between the members. Therefore, it can be reliably used as a gap sealant composition for a display device. It is possible to realize a glazing effect.

Since the composition according to the present invention is used for the purpose of filling the gap formed at the overlapping portion of the bezel and the display surface, it is cured and has adhesiveness, and the sample is sufficiently deformed at the maximum adhesive strength. It is preferable to form a large resin member. Specifically, in the cured silicone resin member, the tensile shear adhesive strength (hereinafter simply referred to as “shear adhesive strength”) measured at 25 ° C. according to JIS K6850 is 0.05 μMPa. The above is preferable, more preferably in the range of 0.05 to 10 MPa, and practically in the range of 0.1 to 5 MPa. Further, when the tensile shear displacement amount with respect to the sample thickness at the peak value of tensile shear adhesive strength (= maximum adhesive strength) is measured for the same resin member, the displacement ratio is preferably 1000% or more. The proportion is preferably in the range of 1000 to 6000%. By using a resin member that has a sufficiently large deformation of the sample in such adhesiveness and maximum adhesive strength, the members are firmly bonded to each other, and the dam material does not peel from the member or cause a gap even with some deformation. Therefore, by using as a gap sealant composition for a display device according to the present invention, it is possible to achieve a reliable cover effect.

[Display device manufacturing method and display device]
The present invention relates to a display device manufacturing method and a display device characterized by the use of the gap sealant composition for a display device described above.

Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described with reference to the accompanying drawings. In the present specification and drawings, the same reference numerals are used for substantially the same components even if they are slightly different. The shapes depicted in the drawings are drawn so as to be easily understood by those skilled in the art, and thus do not necessarily match the actual dimensions and ratios. The sectional view shows only the cut surface, and the depth structure is omitted. The term “comprising” in the present specification and claims includes a case of including elements other than the specified elements. The same applies to “having” and “including”. The “resin member” means a silicone resin member obtained by curing the gap sealant composition.

First, a display device obtained by using the manufacturing method of the present invention will be described based on Embodiment 1 of the present invention shown in FIG. 1 and FIG.

As shown in FIG. 1, a display device 203 according to the present invention includes a display panel 10 having a display surface 11, a frame portion 21 and an opening end 22 inside the frame portion 21, and the display surface of the display panel 10. A bezel 20 whose peripheral edge on the 11 side is covered with a frame portion 21, a front panel 30 provided with the bezel 20 sandwiched between the display surface 11 side of the display panel 10, and an opening end 22 of the bezel 20. Filling between the display surface 11 and the front panel 30 with the resin member 40 that fills the gap 72 generated in the overlapping portion of the bezel 20 and the display surface 11 in the direction perpendicular to the display surface 11 without a gap. OCR 50 is provided. Here, the display surface 11 refers to the entire surface of the polarizing plate 12 on the front panel 30 side (the same applies hereinafter).

A CF substrate 13 and a TFT substrate 14 are provided to face each other via a liquid crystal (not shown), and polarizing plates 12 and 15 are provided on the outer side of the CF substrate 13 and the outer side of the TFT substrate 14, respectively. 10 is configured. The display panel 10 is mounted on the backlight unit 71, and the bezel 20 and the backlight unit 71 are fixed by a fitting structure (not shown), whereby the display module 70 is configured. The entire surface of the display module 70 and the front panel 30 such as a touch panel is bonded via the OCR 50. Here, the resin member 40 is provided so that the gap 72 generated in the overlapping portion between the bezel 20 and the display surface 11 does not have a gap in the direction perpendicular to the display surface 11. In this structure, since the resin member 40 is provided only in the overlapping portion between the bezel 20 and the display surface 11, the display area 18 is not substantially affected, and the bezel 20 has a narrow structure. However, it does not cause display unevenness in the completed display device, and the display quality, in particular, the display quality and operability in the region close to the end of the bezel are improved. Further, since the resin member 40 fills the bezel 20 and the display surface 11 in the vertical direction without gaps, the overflow of the OCR 50 is effectively suppressed and the purpose of so-called “sticing” is reliably achieved, and the display device It is possible to improve the durability of the product, reduce the incidence of defective products during production, and further improve the yield and display quality.

Note that, as described above, the resin member 40 has a structure in which the bezel 20 and the display surface 11 are filled in the vertical direction without a gap, and does not have a structure straddling the display region 18 or the bezel 20. The display area 18 can be maximized while no projections or uneven structures derived from the resin member 40 are formed on the bezel 20, so that the resin member proposed in Patent Document 2 or the like is placed on the bezel 20. Compared to the structure in which the air gap 72 is closed and straddled, unevenness and dimensional (height) variations on the bezel are less likely to occur, and the distance between the surface 23 of the bezel 20 and the front panel 30 in FIG. 2 can be kept constant. The front panel 30 is arranged with high flatness by the adhesive member 60 disposed on the outer periphery of the bezel 20, and it is possible to prevent the appearance defect and the adhesion failure from occurring. In addition, since the resin member 40 filling the gap 72 under the bezel 20 has a reliable weathering effect, the OCR 50 does not overflow the display panel 10 or the backlight unit 71.

As shown in FIGS. 3A and 3B, the display device according to the first embodiment has a gap sealant for a display device according to the present invention at an angle with respect to the gap 72 in the range of horizontal to 75 degrees. It can be obtained by a method for manufacturing a display device including a step of injecting and filling the composition. As proposed in Patent Document 2 and the like, when the injection angle with respect to the gap 72 is in the vertical direction, as shown in FIG. 5, the gap 72 generated at the overlapping portion of the bezel 20 and the display surface 11 is closed from the outside. As a result, the scale is insufficient and the OCR 50 overflows to the bottom of the display panel 10 or the backlight unit 71. This is verified in a reference example with respect to an example described later.

Here, as a means for injecting the gap sealant composition for the display device at an angle with which the injection angle is horizontal to 75 degrees with respect to the gap 72, an L-shaped, substantially L-shaped or flexible discharge port is used. An injection device having at least one selected discharge port is preferably used. More specifically, the injection angle is horizontal (= 0 degrees) to 75 degrees with respect to the gap 72 using a syringe or dispenser provided with an L-shaped nozzle, a substantially L-shaped nozzle or a flexible nozzle. Angle, more preferably, the injection angle is horizontal (= 0 degrees) to 45 degrees, particularly preferably the angle at which the injection angle is horizontal (= 0 degrees) to 30 degrees, most preferably relative to the gap 72. In the method for manufacturing a display device of the present invention, it is preferable to provide a step of injecting a gap sealant composition for a display device with an injection angle that is substantially horizontal (= 0 degree). As an injection device provided with such an L-shaped nozzle or the like, for example, a syringe or a dispenser provided with an L-shaped needle (Musashi Curve Needle CPN-18G-A90 manufactured by Musashi Engineering Co., Ltd.) is commercially available.

Note that the use of a straight needle in horizontal injection is substantially because a structure that serves as an obstacle is disposed in a short-distance direction in a state where the bezel 20 on the frame is disposed as clearly shown in FIG. This requires the use of an infusion device with a flexible nozzle that can be bent, such as an L-shaped nozzle / needle, a generally L-shaped nozzle / needle, or a rubber nozzle / needle.

More specifically, in this manufacturing method, first, the discharge port is substantially formed with respect to the gap 72 by a dispenser device having an L-shaped nozzle on the display surface 11 of the display panel 10 along the opening end 22 of the bezel 20. The gap sealant composition for the display device is injected at a constant speed and in a constant amount so as to be horizontally oriented (FIG. 3A), and UV light is emitted from the spot UV light source so as to follow the injection path of the dam material. Irradiation was performed to form the resin member 40 inside the gap 72 formed at the overlapping portion of the bezel 20 and the display surface 11 (FIG. 3B). In addition, since the gap sealant composition for a display device according to the present invention has a fast-curing / fast-drying curing profile, a non-flowable reactant is formed before irradiation with UV light. The object may be further cured by irradiation with UV light, and irradiation with UV light may be omitted. In addition, when injecting the curable resin composition to be a dam material, it is particularly preferable to inject at a constant speed and in a constant amount with the tip of the L-shaped nozzle inserted inside the gap 72.

In the manufacturing method and the display device according to the present invention, the gap sealant composition for a display device that can be used for the purpose of filling a gap formed at the overlapping portion of the bezel and the display surface and the curing means thereof are as described above. Yes, it can be cured in a short time and does not adversely affect each component of the display device. From the standpoint of not adversely affecting each member of the display device, photo-curing by UV light irradiation (including the use of photoreactive hydrosilylation catalyst) It is preferable to select a curing system in which is the main curing means.

The dimensions of the display device of Embodiment 1 are not particularly limited, and the design dimension from the open end of the bezel to the display area is 0.1 to 10 mm, preferably 0.2 to 5 mm. It is common to do. For example, the display module 70 has a design dimension of 1.5 mm from the open end 22 of the bezel 20 to the display area 18, whereas the gap 72 between the display panel 10 and the bezel 20 is 0.2 mm and the thickness of the bezel 20 is The thickness may be designed in the range of 0.3 mm. However, due to various variations, the actual size of the gap 72, that is, the distance from the display surface 11 of the display panel 10 to the surface 23 of the bezel 20 varies greatly when the bezel 20 is placed on the display panel as it is. When the gap sealant composition for a display device is injected at a constant speed and in a fixed amount, it may cause a filling failure in the gap 72. If there is such a filling defect, the gap 72 cannot be sufficiently closed, and a gap is generated. Therefore, after the OCR is injected, the OCR penetrates into the display module from the gap and leaks, and the display quality deteriorates. Or the durability of the display device may be reduced.

In the present invention, in order to inject the gap sealant composition for the display device so that the discharge port is substantially horizontal with respect to the gap 72, the gap 72 is closed from the vertical direction (FIG. 5, patent). Such a filling failure is less likely to occur compared to Document 1 or Patent Document 2). However, in order to more surely fill the gap between the bezel and the display panel and perform reliable filling, the following display device is manufactured. The method can be suitably employed.

That is, since the variation in the gap between the bezel and the display panel is derived from the swell of the bezel, the two are not arranged as they are, but in advance between the bezel and the display panel in the direction perpendicular to the display panel. After disposing a member having a function of filling the gap without gaps, the gap sealant composition is injected and filled to eliminate or reduce the variation in the gap height between the bezel and the display panel. Can do.

Such a member has a physical or chemical affinity to the injected gap sealant composition in addition to the function of keeping the height between the members constant. Leakage can be prevented and more effective weathering can be realized by using as a starting point or an ending point at the time of filling.

Such a member may be a resin member obtained by curing the same or different curable resin composition as the resin member filled in the gap between the bezel and the display panel, and both are for the display device according to the present invention. A silicone resin member obtained by curing the gap sealant composition is preferred. Since these resin members have a function of adjusting the height of the gap between the two members when the bezel having waviness is arranged on the display panel, the resin member has a function of adjusting the height of the gap. Preferably, three or more points are more preferable, and four or more points are particularly preferable. Most preferably, the resin member has four corners or at least four points arranged on substantially diagonal lines. In particular, when these resin members are the same as resin members obtained by curing a curable resin composition injected for the purpose of filling the gap between the bezel and the display panel, the starting point at the time of injection When the uncured curable resin composition injected from the discharge port comes into contact with the resin member placed at the end point (including the intermediate point), the interface between the two has good affinity for interfacial tension In addition, it spreads uniformly in the entire region of the gap into which the curable resin composition has been injected and is less likely to be biased, so that filling defects associated with so-called “shrinkage” are effectively suppressed. That is, by selecting a resin member obtained by curing the same curable resin composition as a resin member used as a holding member and a resin member used for filling the gap between the bezel and the display panel. There is an advantage that it is possible to prevent the resin member from being partially biased during filling and to prevent poor filling, and it is possible to more reliably cover the entire gap region.

In other words, in a preferable method for manufacturing a display device of the present invention, at least at one point of the entire circumference of the opening of the bezel, a gap between the bezel and the display panel is previously provided in a direction perpendicular to the display panel. After disposing a member having a function of filling the gap without any gaps, the gap between the bezel and the display panel is set to a horizontal to 75 degree injection angle with respect to the gap on the entire periphery of the opening of the bezel. It includes the step of injecting and filling the gap sealant composition for a display device of the present invention at an angle within a range. The resin member provided for the purpose of filling the gap between the members in the vertical direction with respect to the display panel without any gap is a display surface on the display panel, and when the bezel is disposed, In the entire circumference of the part, it is preferable to provide four points or more on each of the four corners or the longitudinal and lateral axes. After the holding material made of these resin members is provided on the display surface, the bezel having the waviness is arranged to effectively adjust the distance from the display surface of the display panel to the surface of the bezel, that is, the height of the gap. In addition, by suppressing or minimizing the variation, and further improving the affinity to the gap sealant composition according to the present invention, the leakage in the vertical direction is effectively suppressed, and the starting point or the ending point at the time of injection Since it functions, it can suppress that the gap sealing agent composition inject | poured flows and a poor filling generate | occur | produces. As a result, when the gap sealant composition of the present invention is injected into the gap at a constant speed and in a constant amount at an injection angle of ˜75 degrees in the horizontal direction, filling defects in the gap are further suppressed, and reliable filling is achieved. .

More specifically, as shown in FIG. 4, in the end portion of the display surface 11 of the display panel 10 according to Embodiment 1 of the present invention, which is inside the opening end 22 when the bezel 20 is disposed. A resin member 41 which is a holding material made of a resin member (a gap sealant composition for a display device of the present invention) is arranged in advance (FIG. 4A), and the bezel 20 is arranged in a state where the height is held by the holding material. (FIG. 4B). This effectively adjusts the distance from the display surface of the display panel to the surface of the bezel, that is, the height of the gap 72, and suppresses poor filling of the gap sealant composition injected into the entire periphery thereafter. Is. Although not shown, since the bezel 20 has a quadrangular shape, the gap sealant of the present invention can be obtained by pre-adjusting the height of the same gap 72 at one or more points on the four corners or each side, for a total of four or more points. When the composition is injected into the gap at a constant speed and in a fixed amount at an injection angle of ˜75 degrees in the horizontal direction, filling defects in the gap are further suppressed, and reliable filling is achieved.

In the production method and display device according to the present invention, the curable resin composition used for forming the resin member that is the gap holding material is not particularly limited, and the curable resin composition that is the dam material. May be the same as or different from those exemplified. From the viewpoint of simplicity of the working process, a curable silicone resin composition of the same kind as that preferably exemplified as the gap sealant composition may be used and is preferable.

From the viewpoint of effectively adjusting the height of the gap, it is preferable that the height of the resin member as the holding material is substantially the same at each point. However, the resin member obtained by curing the curable resin composition can be selected from an adhesive and an elastic body or a gel-like cured product. By using such an elastic body or a gel-like cured product, the resin member Even if the heights are somewhat uneven, there is an advantage that the resin member is deformed when arranged on the resin member of the bezel, and the overall gap height is adjusted to be substantially the same.

The manufacturing method and display device according to the present invention further have a structure in which a display panel and a front panel are bonded together using a curable resin composition that is OCR, and a process related thereto.

That is, in the manufacturing method according to the present invention, after the step of injecting and filling the curable resin composition into the gap between the bezel and the display panel,
further,
Applying the same or different curable resin composition to the display surface side of the display panel; and
A step of attaching a front panel to the display surface side to which the curable resin composition is applied with the bezel sandwiched therebetween. In the present invention, the silicone resin member formed by curing the gap sealant composition for a display device reliably achieves the cover for the curable resin composition that is OCR, at the time of application or injection of OCR. Since OCR leaks from the gap and penetrates into the display module, it is possible to achieve high display quality and durability in the resulting display device, and to suppress the occurrence of defects during manufacturing, thereby reducing yield. Can be improved.

In Embodiment 1 of the present invention, after filling the gap 72 with the resin member 40, the OCR 50 is applied over the entire surface, the adhesive 60 is applied over the entire outer periphery of the bezel 20, and the touch panel as the front panel 30 is placed in a reduced pressure environment. After the whole surface is bonded, it is fully cured by UV irradiation. The display device 101 shown in FIG. 2 is completed by such a series of manufacturing processes. The manufacturing process of the display device 101 according to the first embodiment excludes the step of filling the gap 72 by the resin member 40, which is the dam material, and the step of preliminarily adjusting the height of the gap 72 with a holding material. Is equivalent to a general optocarbonizing process, and has versatility as an optocarbonizing process of a display device.

In the manufacturing method of the first embodiment, the gap sealant composition for a display device that forms the resin member that is a dam material and the resin member that is a holding material for the gap 72 is UV-irradiated simultaneously with the application. However, if the viscosity of the gap sealant composition for these display devices is sufficiently high and the coating shape can be maintained for a certain period of time, UV irradiation may be performed after coating the entire circumference. In some cases, UV temporary curing itself is not necessary. In the manufacturing method and the display device according to the present invention (the first embodiment), these resin members are formed directly under the bezel 20, that is, outside the display region. Problems such as the fact that the boundary is easily visually recognized due to the difference in refractive index from the OCR used for optical carving are essentially solved. That is, the display quality and performance are deteriorated due to the refractive index difference between the OCR and the resin member disposed for the purpose of closing the gap 72, which has been a problem in the prior art (Patent Document 1 or Patent Document 2). The present invention provides an essential solution to this problem.

In the manufacturing method according to the first embodiment, the OCR coating process (in the case of optical carburizing) or the bonding process required for manufacturing a display device having a front panel is limited to the above-described reduced pressure environment. Without limitation, a known bonding method under an atmospheric pressure environment may be employed. For example, OCR is applied to the front panel in an atmospheric pressure environment, and the front panel is inverted and bonded to the display module (reverse bonding method), or a predetermined gap is secured between the front panel and the display module. Alternatively, a method of arranging them in parallel and filling OCR between the gaps (gap dispensing method) may be used.

Next, effects of the display device 101 according to the first embodiment will be described.

According to the first embodiment, the gap 72 between the opening end 22 and the display panel 10 is completely covered by the resin member 40, and the resin member 40 is formed under the bezel 20, so that Since the dam is not broken in the process and the uncured OCR 50 does not leak into the display module 70, the display device 101 with high display reliability can be provided. Further, since the resin member 40 does not reach the display area, there is a problem of display quality and display performance degradation such as display unevenness at an end portion resulting from a difference in refractive index from the OCR, and a decrease in operability derived therefrom. The problem is essentially solved.

In addition, according to the first embodiment, the distance between the opening end 22 and the gap 72 between the display panel 10 is previously held constant by the resin member 41 that is a holding material, and injected. Even if the gap sealant composition is injected into the gap 72 at a constant and constant speed, it can improve the affinity for the gap sealant composition for the display device and function as a starting point / end point at the time of injection. Reliable weathering can be achieved, and industrial productivity is excellent. Further, since the resin member 40 is formed under the bezel 20, when the front panel 30 is disposed on the bezel 20, the unevenness derived from the resin member 40 used for the cover does not occur, and the front panel It is possible to prevent poor appearance and poor adhesion at the time of attachment.

In addition, although the display panel 10 and the front panel 30 in the first embodiment have a structure in which the entire surface is bonded by OCR, the structure is bonded with an air layer (air gap bonding). You may change to

In the first embodiment, the adhesive member 60 is disposed on the bezel 20. This is because when the external force F in the peeling direction is applied to the OCR 50 on the display surface 11, the front panel 30 and the OCR 50 are peeled off. The purpose is to improve resistance. As a result, even when the front panel 30 having a larger outer shape than the display module 70 is bonded, it is possible to reliably reinforce the adhesive so that the OCR 50 on the display surface 11 is not stressed. . In addition, it is desirable from the viewpoint of reinforcement that the adhesive strength of the adhesive member 60 is stronger than that of the OCR 50. However, if the adhesive member 60 is equal to or more than the OCR 50, a certain reinforcing effect can be obtained. Further, when the OCR 50 has a high adhesive strength, the adhesive member 60 may not be provided. That is, in Embodiment 1, the adhesive member 60 is an arbitrary component. When a shield substrate or the like further provided with a conductive layer is inserted between the display module 70 and the front panel 30, the adhesive member 60 is preferably a conductive material (= conductive adhesive).

In the manufacturing method and the display device according to the present invention, the display device has a structure in which a space between the display surface and the front panel is filled with a substantially transparent optical elastic resin member or optical gel resin member. A display device is preferred. By using such an optical elastic resin member or optical gel resin member as OCR for optical carving, the display performance and durability of the display device can be improved, and a highly reliable display device can be provided.

Such an OCR is preferably formed by curing a curable resin composition, and has physical properties relating to a ratio of displacement with respect to a sample thickness at the above-described penetration, shear adhesive strength, and maximum adhesive strength, and UV. The silicone resin hardened material (member) formed by photocuring including light irradiation is illustrated.

Such OCR is not particularly limited, but is commercially available from Toray Dow Corning / Dow Corning, EG-1200, EG-4131, VE-6001６００UV, etc .; manufactured by Wacker, SilGel 612 PT, LUMISIL 100, LUMISIL 102 Is available. The gap sealant composition of the present invention may be used as an OCR, and may minimize differences in physical properties such as refractive index and hardness of the two, or may further improve adhesion and sealing properties. is there.

In the manufacturing method and the display device according to the present invention, the display device further includes:
A shield substrate provided on a surface of the front panel facing the display surface and having a surface on which a transparent conductive film is formed;
The display device may include a structure in which the transparent conductive film and the bezel are electrically connected via a conductive material.

For example, in the display device 101 (FIG. 1) according to the first embodiment, a shield substrate such as an EMI (Electro-Magnetic Interference) substrate provided with a conductive layer on one side between the display module 70 and the front panel 30. Can be inserted. Since such a shield substrate has an electromagnetic wave shielding function, the front panel 30 is prevented from malfunctioning due to electromagnetic waves radiated from the display module 70. In addition, a conductive layer made of a transparent conductive film such as ITO (Indium Tin Oxide) is formed uniformly or in a mesh shape on one side of the shield substrate. And in order to set the electric potential of the said conductive layer to GND of the display module 70, the adhesive members 60 etc. which are arrange | positioned on the outer periphery of the bezel 20 can also be formed with conductive adhesive members, such as Ag paste, for example. Note that the bezel 20 of the display module 70 is made of metal and is GND-connected in the display module 70. Here, by using the adhesive member 60 as a conductive material, the metal bezel 20 and the conductive layer of the shield substrate can be reliably connected to the GND, so that a display device with high electromagnetic wave resistance can be provided.

Although the present invention has been described with reference to the above embodiment, the present invention is not limited to each of the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention. Further, the present invention includes a combination of some or all of the configurations of the above-described embodiments as appropriate.

For example, in each embodiment, the UV curable case has been described as the OCR for whole surface bonding. However, the present invention is not limited to this, and the same applies to the case of a thermosetting type, a moisture curable type, or a composite curable type thereof. The effect is obtained. Further, as long as the technical effect of the present invention is not impaired, a further dam material is provided outside the silicone resin member that fills the gap between the bezel and the display panel as a dam material, and a part of the gap or It does not preclude taking a structure that covers everything. For example, if the design uses a special shape for a part of the bezel and the gap cannot be completely closed even if the above method is used, the curable resin composition that is a dam material at the point is pinpointed. Things may be injected.

Furthermore, although the case where the shape of the front panel is a square shape has been described, it is not necessary to be a square shape, it may be any polygonal shape, a flat plate having a curved portion, or a combination thereof, and moreover, it is a three-dimensional shape. It does not matter.

Hereinafter, the manufacturing method of the display apparatus of this invention is demonstrated in detail by an Example and a comparative example. However, the present invention is not limited to the description of the following examples. In addition, display devices manufactured according to the following embodiments are included in the scope of the present invention, but the display devices of the present invention are not limited to the description of the following embodiments.

[Each component]
In the examples and comparative examples, the following components were used, and the compositions of the compositions are shown in Tables 1 and 2.

(A1-1-1) to (a1-1-7) Vi both-end siloxane (n = X): dimethylpolysiloxane blocked with dimethylvinylsiloxy group at both ends of molecular chain, dimethylpolysiloxane unit (D unit: ( (The siloxane unit represented by CH ₃ ) ₂ SiO _2/2 ) is X (in this example, n = 37, 272, 382, 400, 404, 460 and 660 are used) And is represented by the following structural formula:
(CH ₂ = CH) (CH ₃ ) ₂ SiO-((CH ₃ ) ₂ SiO) _X -Si (CH ₃ ) ₂ (CH = CH ₂ ))

・ (A1-2) M ^Vi MQ resin:
Structural formula {(CH ₂ = CH) (CH ₃ ) ₂ SiO _1/2 } _4.8 {(CH ₃ ) ₃ SiO _1/2 } _39.2 (SiO _4/2 ) ₅₆
Organopolysiloxane resin represented by

(A3-1-1) CE-SiH siloxane:
Structural formula H (CH ₃ ) ₂ SiO-((CH ₃ ) ₂ SiO) ₂₀ -Si (CH ₃ ) ₂ H
Organohydrogenpolysiloxane having SiH groups only at the ends represented by

(A3-1-2) CE-SiH siloxane:
Structural formula H (CH ₃ ) ₂ SiO-((C ₆ H ₅ ) ₂ SiO) -Si (CH ₃ ) ₂ H
Organohydrogenpolysiloxane having SiH groups only at the ends represented by

(A3-2-1) XL-SiH siloxane:
Structural formula (CH ₃ ) ₃ SiO-((CH ₃ ) ₂ SiO) ₂₈ (H (CH ₃ ) SiO) ₂₈ -Si (CH ₃ ) ₃
Linear organohydrogenpolysiloxane having 3 or more SiH groups in the side chain

(A3-2-2) XL-SiH siloxane:
Structural formula {H (CH ₃ ) ₂ SiO _1/2 } ₆₀ {(C ₆ H ₅ ) SiO _3/2 } ₄₀
Resinous organohydrogenpolysiloxane having 3 or more SiH groups in the molecule represented by

(B1-1-1) Pt: 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex of platinum (a curing reaction catalyst for proceeding hydrosilylation reaction at 25 ° C., platinum alkenyl Siloxane complex)

・ (B1-2-1) UV-Pt: (Methylcyclopentadienyl) trimethylplatinum (IV) complex (Curing reaction catalyst that promotes hydrosilylation reaction by ultraviolet (UV) irradiation)

[Gap sealant compositions for display devices of Examples 1 to 9 and Comparative Examples 1 to 9]
Each component was uniformly mixed with the composition shown in Table 1 and Table 2 using the static mixer, and the composition concerning an Example and a comparative example was prepared. Except for the curing reaction catalyst of component (B), the number of each component in the table is part by mass. In the table, the following values and measurement results were further described.

SiH (CE) / Vi: For a linear or branched organohydrogenpolysiloxane having a silicon-bonded hydrogen atom only at the end of the molecular chain, a silicon bond with respect to a total of 1 mole of vinyl groups in other components Moles of hydrogen atoms

SiH (XL) / Vi: For a linear or resinous organohydrogenpolysiloxane having at least three silicon-bonded hydrogen atoms in the molecule, silicon is added to a total of 1 mol of vinyl groups in other components. Number of moles of bonded hydrogen atoms

Pt (ppm): platinum content derived from platinum alkenylsiloxane complex

UV-Pt (ppm): platinum content derived from (methylcyclopentadienyl) trimethylplatinum (IV) complex

Initial viscosity: The initial viscosity (mPa · s) measured immediately after the composition was prepared at 25 ° C. using a TA Instruments rheometer (AR550). A 20 mm diameter plate was used as the geometry. The viscosity was a value at Shearrate 20 (1 / s).

・ Double viscosity arrival time: Immediately after the preparation of the composition, at 25 ° C., the viscosity was measured every minute using a TA Instruments rheometer (AR550), and the time when it reached twice the initial viscosity ( Minutes). The viscosity was a value at Shearrate 20 (1 / s).

・ Penetration: After 2 hours or more have passed and the curing reaction is practically complete, the cured silicone resin member is defined in JIS K2220 at 25 ° C. using PENETROMETER RPM-101 manufactured by Kouaisha. The penetration was measured.

G'1000 Pa arrival time: Immediately after the preparation of the composition, using a rheometer manufactured by TA Instruments (AR550) at 25 ° C., using a cone plate with a diameter of 20 mm as a geometry, and a frequency of 1 Hz, 1 The storage elastic modulus G ′ was measured every minute, and the time (minute) at which G ′ of the reaction product reached 1000 Pa was recorded. In addition, the measurement was performed in the same manner when there was ultraviolet irradiation (with light irradiation).

・ Check for fluidity after 30 minutes:
Immediately after each composition was uniformly mixed with a static mixer at room temperature, it was discharged into a horizontal plate shape, allowed to stand at 25 ° C. for 30 minutes, and then tilted to confirm the presence or absence of fluidity. If no flow was observed even when the plate was tilted, it was evaluated as “non-flowable”.

-With light irradiation, fluidity after 20 minutes:
Each composition was uniformly mixed with a static mixer at room temperature, and then discharged into a horizontal plate shape. At 25 ° C., ultraviolet rays at 365 nm were used using a 2 W high-pressure mercury lamp having a glass filter for suppressing ozone generation. Ultraviolet rays were irradiated so that the irradiation amount was 5000 mJ / cm ^2, and after standing for 20 minutes, the presence or absence of fluidity was confirmed by tilting the plate. If no flow was observed even when the plate was tilted, it was evaluated as “non-flowable”.

-Shear adhesive force (MPa) and shear bond elongation (%)
For Examples 1 to 6, the shear adhesive force (MPa) and the shear adhesive elongation (%) were further measured by the following methods, and are shown in Table 1.
Measurement method: Gap sealant for display device (cured product) with a sample thickness of 200 μm obtained by curing each composition is bonded in a range of 25 mm × 25 mm square between two glass plates, and a universal material test from both sides Using a machine (manufactured by Shimadzu Corp., Autograph AGS-1kNG), the peak value of the shear adhesive strength (MPa) was measured by pulling in the horizontal direction at a test speed of 100 mm / min. Further, the value obtained by multiplying the horizontal displacement at the peak value of the shear adhesive force (MPa) in the same test by the sample thickness (200 μm) multiplied by 100 is shown in Table 1 as the shear adhesive elongation (%). It was described in.

The comparative examples 1 to 9 corresponding to the examples 1 to 9 differ in the content of the hydrosilylation reaction catalyst, particularly the content of the component (b1-1-1) having hydrosilylation reaction activity at 25 ° C. In Examples where the amount of platinum is large, immediately after mixing, it is a liquid composition having an initial viscosity in the range of 1100 to 21000 mPas, and the time to reach twice the initial viscosity is in the range of 3 to 14 minutes. Therefore, while having a sufficient pot life, a non-flowable reactant was given within 30 minutes. In Examples 5 to 7 and 9 containing a photoactive platinum catalyst, a more rapid curing reaction was realized by using ultraviolet irradiation together, and a non-flowable reactant was formed within 20 minutes. It was to give. On the other hand, in the comparative example, at 25 ° C., it is fluid after 30 minutes, and the time until it reaches twice the initial viscosity is 18 minutes or more. When used as an object, there is a concern that the weathering will be insufficient or that it will flow out of the gap and penetrate into the display module.

[Bonding model test of display device]
In order to evaluate the bonding quality of the display device, the following model test was performed.
A glass plate (A) of 50mm x 50mm x 1mm that imitates the display part, a 55mm x 55mm x 1mm acrylic frame (B) that has a cutout part of 40mm x 40mm in the center imitating the bezel, and the front panel Simulated glass plate (C) of 55 mm x 55 mm x 1 mm. 1.7 mm high spacers are provided at the four corners of the display part A to provide a gap with the bezel B, and the bezel B is adhered and cured to the display part A by the method of the example and the comparative example. Later, OCR is filled in the space formed in the central part of the display part A and the bezel B, and the front panel C is bonded. By observing whether the filled OCR leaks from the gap between the display A and the bezel B when the front panel C is bonded, the bonding quality of the bezel B (without seal failure, over the entire circumference of the bezel B) And the display part A can be joined without any gaps).
Note that the gap sealant composition for display device of Example 5 was used in Example 11 of the present invention, but the same applies to the compositions of other Examples 1 to 4, 6 to 9. Is available.

[Example 10]
The above-mentioned gap sealant composition for display device of Example 5 (hereinafter referred to as “UV curable adhesive”) was mixed into a Musashi clear syringe PSY-10E while mixing with a static mixer, and an auto dispenser (Musashi Engineering Co., Ltd.). Set to company SHOTMASTER 300 DS-S) and fitted with 18G standard needle.

Dispense UV curable adhesive into the four corners of the display area A (inside from the apex, 7mm from each side) at a discharge pressure of 500kPa for 1 second, place the UV curable adhesive and place the bezel B on the display area A On the other hand, it was pasted with center alignment. At this time, at each point (four corners), the gap between the display portion A and the bezel B was filled in a direction perpendicular to the display portion A with a UV curable adhesive.

Change the needle to an L-shaped needle (Musashi curve needle CPN-18G-A90), and set the tip of the needle to a position where it has entered 1 mm or more into the gap between display part A and bezel B, discharge pressure 500kPa, coating speed 1. At 8mm / s, apply UV curable adhesive on the four sides so that the UV curable adhesive placed at the four corners as the starting point / end point of the application is connected, and irradiate 365nm UV with 2J. The bezel B was joined to the display part A.

Fill the center space formed by the display unit A and the bezel B with 5g while mixing OCR (Toray Dow Corning EG-1200) with a static mixer, and join the front panel C with the display unit A and the bezel B Gently pasting with the center aligned so that it does not contain air bubbles parallel to the body, press the front panel C to the bezel B か ら from the boundary of the bezel B and the front panel C 寸 until just before the OCR 漏洩 leaks And left at room temperature for 30 minutes to cure the OCR.

When the entire gap between the display area A and bezel B was inspected, no leakage of OCR was observed.

[Reference Example 1]
Without pre-applying UV curable adhesive to the four corners of display A, set the tip of the 18G standard needle so that it does not touch the inner edge of the central cutout of bezel B, discharge pressure 500kPa, application speed 1.8mm / s In the same manner as in Example 1, except that a UV curable adhesive was applied to the four sides of the central cutout, the adhesive was cured by irradiating 365 nm UV at 2 J, and the bezel B was joined to the display A. Was pressure bonded to bezel B and allowed to stand at room temperature for 30 minutes to cure the OCR. In Comparative Example 1, the UV curable adhesive is applied from the direction perpendicular to the gap between the display portion A and the bezel B.

Leakage of OCR was observed from the gap between the display area (A) and the bezel (B).

[Reference Example 2]
Without pre-applying UV curable adhesive to the four corners of display area A, set the tip of the 18G standard needle so that it does not touch the inner edge of the central cutout of bezel B, discharge pressure 500kPa, application speed 0.9mm / s In the same manner as in Example 1, except that a UV curable adhesive was applied to the four sides of the central cutout, the adhesive was cured by irradiating 365 nm UV at 2 J, and the bezel B was joined to the display A. Was pressure bonded to bezel B and allowed to stand at room temperature for 30 minutes to cure the OCR. In Comparative Example 2, the UV curable adhesive was applied from the direction perpendicular to the gap between the display portion A and the bezel B, and a coating speed of 1/2 was applied to Example 10 and Reference Example 1. Then, double the amount of coating is performed.

No leakage of OCR was observed from the gap between the display unit A and the bezel B, but the bonding between the display unit A and the front panel C became non-parallel, and the gap between the bezel B and the front panel C C It was uneven.

[Summary of experimental results]
Less than,
・ OCR leakage,
Table 3 shows the accuracy of mounting the front panel, that is, the presence or absence of non-uniformity in the gap between the bezel and the front panel due to the application of the UV curable adhesive in relation to the experimental conditions.

As shown in Table 3, the gap between the bezel and the display portion is previously filled in the vertical direction by four-point application of the UV curable adhesive which is the gap sealant composition for display device of the present invention, and the application is performed. In Example 10 in which a UV curable adhesive was injected at a constant speed from the horizontal direction into the gap using an L-shaped needle with respect to the gap, starting from the adhesive (resin member) obtained by The model test proved that it is possible to manufacture a display device with excellent reliability without causing leakage of the OCR and poor mounting of the front panel.

On the other hand, when a UV curable adhesive is injected into the gap from a direction perpendicular to the gap by using a known technique, the leakage of OCR can be prevented by applying a small amount as in Reference Example 1. Therefore, the weathering is insufficient. On the other hand, when a large amount of coating is applied as in Reference Example 2, a defect in attachment between members occurs due to the UV curable adhesive, and a large amount of UV curable adhesive exists around the bezel. There is also concern about the occurrence of problems such as display unevenness.

The present invention is not limited to liquid crystal displays, and can be used in the field of display displays such as organic EL displays, electronic paper displays, plasma displays, and the like.

<Embodiment>
101 to 110 Display device 10 Display panel 11 Display surface 12 Polarizing plate 13 CF substrate 14 TFT substrate 15 Polarizing plate 16 Light shielding film 17 FPC substrate 18 Display region 20 Bezel 21 Frame portion 22 Open end 23 Surface 30 Front panel (touch panel)
31 Cover panel 32 Sensor glass 33 FPC board 40-42 Resin member 50 OCR (optical elastic resin)
60 Adhesive member 70 Display module 71 Backlight unit 72 Gap 91 Dispenser device with L-shaped nozzle 94 Nozzle

Claims (16)

(A) one or more types of organopolysiloxane having a curing reactive functional group in the molecule;
And (B) a liquid containing a curing reaction catalyst and having an initial viscosity at 25 ° C. in the range of 100 to 100,000 mPa · s, and forming a non-flowable reactant within at least 30 minutes at the same temperature. A gap sealant composition for a display device. Component (A) is one or more organopolysiloxanes selected from (A1) an organopolysiloxane having a curing reactive group containing a carbon-carbon double bond and (A2) an organopolysiloxane having a condensation reactive group. The gap sealant composition for a display device according to claim 1, comprising at least. Component (A) is
(A1) at least an organopolysiloxane having a curing reactive group containing a carbon-carbon double bond, and (A3) an organohydrogenpolysiloxane having a silicon atom-bonded hydrogen atom,
Component (B) is
(B1) at least a hydrosilylation reaction catalyst,
3. The display device according to claim 1, wherein the silicon-bonded hydrogen atom is in the range of 0.1 to 10 moles per mole of the carbon-carbon double bond in the composition. Gap sealant composition. Component (B) is
(B1-1) a first hydrosilylation reaction catalyst that shows activity in the composition without irradiation with high energy rays, and (B1-2) that does not show activity without irradiation with high energy rays, but has high energy A curing reaction catalyst comprising a second hydrosilylation reaction catalyst that is active in the composition upon irradiation with a ray, wherein the mass ratio of component (B1-1) to component (B1-2) is 90/10 to 5/95 Range of
When irradiated with high energy rays immediately after preparing the composition, it further has the characteristic of forming a non-flowable reactant within at least 20 minutes at 25 ° C.
The gap sealant composition for a display device according to any one of claims 1 to 3. Component (A) is
(A1-1) 100 parts by mass of a linear or branched organopolysiloxane having an alkenyl group only at the molecular chain end,
(A1-2) An alkenyl group-containing organopolysiloxane having at least one branched siloxane unit in the molecule and having a vinyl (CH2═CH—) group content in the range of 1.0 to 5.0 mass% 0-20 parts by mass of resin,
(A3-1) A linear or branched organohydrogenpolysiloxane having a silicon-bonded hydrogen atom only at the molecular chain terminal, in a total of 1 mole of vinyl groups in the components (A1-1) and (A1-2) (A3-2) a linear or resinous organohydrogenpolysiloxane component having at least three silicon-bonded hydrogen atoms in the molecule (A3-2) 2. An organopolysiloxane containing an amount of 0 to 1 mole of silicon-bonded hydrogen atoms relative to a total of 1 mole of vinyl groups in A1-1) and (A1-2). 5. The gap sealant composition for a display device according to any one of items 1 to 4. Component (B) is
(B1-1-1) an alkenylsiloxane complex of platinum, and (B1-2-1) (substituted and unsubstituted cyclopentadienyl) trimethylplatinum (IV), β-diketonatotrimethylplatinum (IV), bis ( β-diketonate) a curing reaction catalyst containing at least one selected from platinum (II), wherein the mass ratio of the component (B1-1-1) to the component (B1-2-1) is from 90/10 to The gap sealant composition for a display device according to any one of claims 1 to 5, which is in the range of 5/95. Component (A) is (A2-1) an organopolysiloxane containing one or more organopolysiloxanes having a condensation reactive group selected from a hydroxyl group, an alkoxy group, an acyloxy group, and an oximoxy group only at the molecular chain end. Siloxane,
Component (B) contains (B2) a condensation reaction catalyst,
The gap sealant composition for a display device according to any one of claims 1 to 6. The component (B) includes (B1-1-1) an alkenylsiloxane complex of platinum, and the platinum content derived from the component (B1-1-1) is in the range of 5 to 30 ppm of the entire composition. Item 8. The gap sealant composition for display device according to any one of Items 1 to 7. The display device according to any one of claims 1 to 8, wherein the display device is an image display device including a bezel and a display panel, and is used for the purpose of filling a gap between the bezel and the display panel. Gap sealant composition for use. The gap sealant composition for a display device according to any one of claims 1 to 9, wherein the composition is a cone plate or parallel plate type motion at 25 ° C within 30 minutes after preparation of the composition. A storage elastic modulus (G ′) measured at a frequency of 1 hertz using a mechanical viscoelasticity measuring device forms a reaction product having a viscosity of 1000 Pa or more. 11. The initial viscosity at 25 ° C. is in the range of 100 to 100,000 mPa · s, and the fluidity is maintained for at least 3 minutes at the same temperature. A gap sealant composition for display devices. The gap sealant composition for a display device according to any one of claims 1 to 11, which gives a cured silicone product having a penetration of the cured product in the range of 5 to 70. The gap seal for a display device according to any one of claims 1 to 12, which gives a silicone cured product having a shear adhesive strength of 0.05 MPa or more and a maximum adhesive strength and a displacement ratio of 1000% or more with respect to the sample thickness. Agent composition. A display device having a display panel having a display surface, and a bezel having a frame portion and an opening end inside the frame portion and covering the display surface side periphery of the display panel with the frame portion is manufactured. A method,
The gap between the bezel and the display panel is formed at an angle at which an injection angle with respect to the gap is in a range of horizontal to 75 degrees in at least a part or all of the entire circumference of the opening of the bezel. A method for manufacturing a display device, comprising a step of injecting and filling the gap sealant composition for a display device according to any one of the above. After disposing a member having a function of filling the gap between the bezel and the display panel in the vertical direction with respect to the display panel without gaps in at least one point on the entire circumference of the opening of the bezel, the gap The method for manufacturing a display device according to claim 14, wherein a step of injecting and filling a sealing agent composition is performed. A display panel having a display surface;
A bezel having a frame portion and an opening end inside the frame portion, and covering the periphery of the display panel side of the display panel with the frame portion;
The gap sealant composition for a display device according to any one of claims 1 to 13, wherein a gap between the bezel and the display panel is provided on at least a part or all of the entire circumference of the opening of the bezel. A display device having a structure filled with a cured resin member.

Images