TW201945508A - Gap-sealing agent composition applied for display device, manufacturing process of display device using it and display device - Google Patents

Abstract

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. 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 DEG 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, manufacturing method of display device using the same, and display device

The present invention relates to a gap sealant composition for a display device, which is particularly suitable for filling a gap between a bezel and a display panel when manufacturing a display device such as a liquid crystal display device, a touch panel, and the like. A method for manufacturing a display device featuring an agent composition, and a structure having a structure for filling a gap between a bezel and a display panel with the gap sealant composition, to further improve displays such as yield, display quality, and durability during manufacture Device.

In recent years, display devices for which a front panel such as a touch panel or a decorative panel is mounted on a liquid crystal display module as a display element have been increasing. The touch panel is an input interface component. The decorative panel is a tempered glass or the like that is printed for decoration from the viewpoint of design and protection of the display surface. These display devices generally consist of a backlight unit, a display panel, a bezel, and a front panel configured to sandwich the bezel. In recent years, with the miniaturization of display panels, diversification of installation places and designs, the width of the bezel has been designed to A more narrow trend.

When a front panel is mounted on a liquid crystal display module, there is usually an air layer between the surface of the liquid crystal panel and the front panel. Therefore, the difference in refractive index between the front panel (such as a glass substrate) and the air layer will cause light to reflect on these interfaces. Especially in outdoor light environment, the reflection of the interface will cause the visibility of the displayed image to be significantly reduced. In this regard, a technique is proposed in which an air layer is partially filled with an optically elastic resin having a refractive index close to that of a glass substrate of a front panel, and a liquid crystal panel is bonded to the front panel, thereby suppressing interface reflection and improving visibility of a displayed image. . This comprehensive bonding technology is called Optical-Bonding or Direct-Bonding. In addition to optical effects, it also has mechanical effects such as preventing splashes and improving impact resistance when the front panel is damaged. is widely used.

In addition, even if the quadrilateral front panel is bonded to the outer periphery of the display module through an air layer (hereinafter, referred to as "air-gap bonding" for convenience of explanation), there is a problem that the display quality is reduced due to the intrusion of foreign matter into the display surface. . In this regard, not only must the front panel be attached to the display module, but also measures must be taken to improve the display quality.

For example, Patent Documents 1 and 2 propose forming a frame-shaped resin member (= blocking material) on a display module, and coating an optical elastic resin (hereinafter referred to as "OCR (Optically Clear Resin)") on the inside, from the top Fits the front panel. In this case, the formation of the resin member is the so-called "sealing purpose". During optical bonding, a dam-shaped resin member made of OCR and the same or similar material is formed between the open end frame and the display panel to prevent OCR. Infiltrated into the display module from the gap.

However, if such a resin member penetrates into the display area (pixel area), it will be confirmed that the display is uneven, and in particular, the display quality at the end of the display surface will be deteriorated. Therefore, a light shielding film between the opening end and the display area is required. A resin member is formed in a limited area, and it is very difficult to fill a gap with a large amount of blocking material in the actual device configuration.

Furthermore, due to the height difference of the frame, the gap height between the frame and the display panel varies. Before the resin member is temporarily cured by UV or the like, the entire gap area cannot be sealed by the resin member, and will be biased to a part of the area ( This phenomenon is called "sink". As a result, a normal resin member cannot be formed, and a gap remains between the resin member and the open end, and the OCR will penetrate into the display module from the gap. On the other hand, in the small gap portion, the resin member itself flows into the back side of the frame before being temporarily cured by UV or the like. The OCR that penetrates into the display module cannot contact the UV light used for curing. It will not be cured after a period of time, and will diffuse to all gaps in the display module, eroding the back of the display panel and the backlight surface, causing poor display, or The cured OCR leaks from the display module, resulting in poor appearance and reduced product durability. In the worst case, it can also cause problems such as unusable products (= poor yield).

Furthermore, in the mechanism of Patent Document 2, a second resin member is formed in addition to the first resin member, and the second resin member is formed so as to straddle the face of the bezel facing the front panel. In addition to deviations in the height of the gaps between the panels, resin frame protrusions will also be formed on the frame. If the front panel is placed on it, unevenness on the surface of the frame or unevenness on the bonding surface will occur, resulting in poor appearance or poor display. Touch panels, etc. Poor contact at the end / Poor handling feel. In addition, in particular, according to the method of Patent Document 2, since the resin member is formed so as to straddle the side of the frame facing the front panel, a small amount of resin member cannot sufficiently block the gap, but on the other hand, if a large amount of resin member is used In addition, it will exceed the limited area of the light-shielding film between the open end and the display area. The resin member area will expand. The original display area will be eroded by the resin member, causing poor display and upside down. The diversity of places and designs shows a tendency to design the frame width to be narrower, and the area of the light-shielding film that can be coated with this resin member is also narrowed. As a result, as described in Patent Document 2, it is difficult to achieve sufficient blocking of the gap with a large number of resin members up to the height of the frame. In fact, if such a first resin member / second resin member is provided to block the gap, it may be caused by the display panel. Due to design reasons, the display performance has an unacceptable level of display unevenness.

Due to the above reasons, a gap sealant is strongly required. Even if the width of the frame is narrow, it can surely fill the gap between the frame of the display device and the display panel, and play the role of caulking. OCR penetrates into the display module from this gap.
Prior art literature
Patent literature

[Patent Document 1] Japanese Patent Laid-Open No. 2010-066711
[Patent Document 2] Japanese Patent Laid-Open No. 2016-164633

Problems to be solved by the invention

On the one hand, the present inventors discovered new problems in the process of solving the above problems.

In recent years, the display device is configured to be small / space-saving, and the display device adopts a narrow frame width (that is, a narrow light-shielding film area). In order to fill the gap between the display frame and the display panel, The inventors of the present invention thought that a resin member could be injected into the space between the bezel and the display panel using an L-shaped needle or the like. In this case, the resin member for filling the gap is arranged under the frame, so that it is expected to provide a display device that does not cause display unevenness at the end of the display device, can effectively prevent OCR from penetrating into the display module from the gap, and can be realized by OCR. A high-quality and highly reliable display device with improved optical bonding, display performance, durability, and the like, and a method for manufacturing the same.

However, if the above method is adopted, there is a problem that it is difficult to cure the curable resin, which is a precursor of the resin member. For example, in Patent Document 1 or Patent Document 2, an ultraviolet curable resin is applied as a blocking agent, and then ultraviolet light is irradiated from a point-shaped UV light source to cure the blocking agent to form a resin member. However, as described above, if In order to arrange a resin member for filling a gap under a frame, a curable resin needs to be injected under the frame, which is structurally light-shielding and cannot be sufficiently irradiated with ultraviolet rays. In addition, the timing of injecting the curable resin into the frame must be after the display module is set. Considering the influence of heat on the display module, it is generally difficult to heat-cure at high temperatures. Therefore, it is desirable to have low-temperature curing properties such as room temperature. . In addition, in order to inject the curable resin into the desired part, the curable resin needs to be uncured and liquid. If the curable resin injected into the frame is kept in a liquid state, the curable resin will flow out from the gap and Penetrating into the display module not only fails to achieve the purpose of caulking, but also causes product failure. In addition, if the curable resin stays under the frame in an uncured state in a liquid state, even if it does not penetrate into the display module, as long as the curable resin is in an uncured state, it cannot fully play the role of caulking. When OCR is injected during the manufacturing process, it is impossible to prevent OCR from penetrating into the display module from the gap.

As described above, if a gap between a frame of a display device and a display panel is filled with a curable resin into the gap, curing may be caused due to its structure and manufacturing process. Therefore, the inventors recognized that A new issue is the need to develop a gap sealant composition that is suitable for filling the gap between the frame of the display device and the display panel. Even if a curable resin is injected into the gap, the problem of poor curing does not occur, or it is not easy to occur. Poor curing problem.

In other words, the present invention has been developed to solve the above-mentioned problems, and an object thereof is to provide a gap sealant composition for a display device. Even if it is injected under a bezel, a problem that may exist due to poor curing does not substantially occur. In the recent trend, it is configured to be small / space-saving, and the design of display devices using a narrow frame width (that is, a narrow light-shielding film area) is also very suitable. Even if there is a deviation between the frame of the display device and the display panel, it can also be used. An easy and effective mechanism for industrial production fills the gap, and effectively prevents OCR from penetrating into the display module from the gap, so that OCR can be used for optical bonding.

Furthermore, by using the gap sealant composition for a display device, the present invention provides a high-quality and highly reliable display device with improved display performance and durability, and a method for manufacturing the same.
Technical means to solve problems

After careful research, the inventors and others found that through:
[1] A gap sealant composition for a display device, comprising: (A) one or more organopolysiloxanes having a curing reactive functional group in the molecule,
as well as
(B) curing reaction catalyst,
It is liquid at 25 ° C with an initial viscosity in the range of 100 to 100,000 mPa ･ s, and further, the formation of a non-flowing reactant within 30 minutes at this temperature can solve the above problems and complete the present invention.

In addition, from the viewpoint of composition design, the present inventors have found that the above-mentioned problems can be effectively solved by the following composition, thereby completing the present invention.
[2] The gap sealant composition for a display device according to [1], wherein the component (A) contains at least organic polysiloxane selected from (A1) and having a curing reactive group containing a carbon-carbon double bond One or more organopolysiloxanes among the alkane and (A2) the organopolysiloxane having a condensation-reactive group.
[3] The gap sealant composition for a display device according to [1] or [2], wherein the component (A) contains at least
(A1) an organopolysiloxane having a curing reactive group containing a carbon-carbon double bond, and
(A3) an organohydrogenpolysiloxane having a silicon atom bonded to a hydrogen atom;
Ingredient (B) contains at least
(B1) a hydrosilylation catalyst;
The silicon-bonded hydrogen atom is in the range of 0.1 to 10 moles with respect to 1 mole of the carbon-carbon double bond in the composition.
[4] The gap sealant composition for a display device according to any one of [1] to [3], wherein the component (B) contains
(B1-1) a first hydrosilylation catalyst that exhibits activity in a composition without irradiating high energy rays, and
(B1-2) Curing reaction catalyst, component (B1-1), which does not exhibit activity unless irradiated with high energy rays, but exhibits activity in the composition by irradiating high energy rays. The mass ratio to the component (B1-2) is in the range of 90/10 to 5/95.
Furthermore, it has the following characteristics: if the high-energy rays are irradiated immediately after the preparation of the composition is completed, a non-flowable reactant is formed within 25 minutes at 25 ° C.
[4-1] The gap sealant composition for a display device according to [4], wherein the high-energy rays are ultraviolet rays, and the cumulative irradiation amount at a wavelength of 365 nm is in a range of 100 mJ / cm ² to 10 J / cm ² .
[5] The gap sealant composition for a display device according to any one of [1] to [4], wherein the component (A) is an organic polysiloxane containing the following components:
(A1-1) only 100 parts by mass of a linear or branched organic polysiloxane having an alkenyl group at the molecular chain end,
(A1-2) Alkenyl group-containing organic polysiloxane resin having at least one branched siloxane unit in the molecule and having an ethylene (CH ₂ = CH-) group content within a range of 1.0 to 5.0% by mass, 0 to 20% by mass Servings,
(A3-1) Only linear or branched organic hydrogen polysiloxanes having a silicon-bonded hydrogen atom at the molecular chain end relative to the vinyl groups in components (A1-1) and (A1-2) total 1 mole Ear, the amount of silicon-bonded hydrogen atoms is 0.1 to 10 moles, and
(A3-2) A linear or dendritic organohydrogenpolysiloxane having at least 3 silicon-bonded hydrogen atoms in the molecule with respect to the vinyl groups in the components (A1-1) and (A1-2) totals 1 mole Ear, the amount of silicon-bonded hydrogen atoms is 0 to 1 mole.
[6] The gap sealant composition for a display device according to any one of [1] to [5], wherein the component (B) contains
(B1-1-1) Alkenyl siloxane complex of platinum, and
(B1-2-1) selected from (substituted and unsubstituted cyclopentadienyl) trimethyl platinum (IV), β-diketonate trimethyl platinum (IV), bis (β-diketone) ) The curing reaction catalyst of at least one of platinum (II), the mass ratio of the component (B1-1-1) to the component (B1-2-1) is in the range of 90/10 to 5/95.
[7] The gap sealant composition for a display device according to any one of [1] to [6], wherein the component (A) contains (A2-1) and only a molecular chain terminal has a hydroxyl group selected from a hydroxyl group One or two or more organic polysiloxanes, polyorganosiloxanes with condensation-reactive groups of alkoxy, alkoxy, alkoxy, and oxime groups,
Component (B) contains (B2) a condensation reaction catalyst.
[8] The gap sealant composition for a display device according to any one of [1] to [7], wherein the component (B) contains (B1-1-1) platinum-containing alkenyl siloxane complex The platinum content derived from the component (B1-1-1) is in the range of 5 to 30 ppm of the entire composition.

In addition, from the viewpoint of the method of use and characteristics, the present inventors have found that the above-mentioned problems can be effectively solved by the following composition, and the present invention has been completed.
[9] The gap sealant composition for a display device according to any one of [1] to [8], wherein the display device is an image display device including a bezel and a display panel, and the gap sealant composition Used to fill the gap between the bezel and the display panel.
[10] The gap sealant composition for a display device according to any one of [1] to [9], characterized in that, at 25 ° C., the following reactant is formed within 30 minutes after the composition is prepared, that is, : Using a cone-plate or parallel-plate dynamic viscoelasticity measuring device, the storage elastic modulus (G ') measured at a vibration frequency of 1 Hz is 1,000 Pa or more.
[11] The gap sealant composition for a display device according to any one of [1] to [10], wherein the initial viscosity at 25 ° C is in a range of 100 to 100,000 mPa ･ s, and further, Maintains fluidity at this temperature for at least 3 minutes.
[12] The gap sealant composition for a display device according to any one of [1] to [11], which can form a cured polysiloxane having a penetration of a cured product in a range of 5 to 70.
[13] The gap sealant composition for a display device according to any one of [1] to [12], which can form a displacement relative to the thickness of the sample at a shear adhesion strength of 0.05 MPa or more Polysiloxane cured at a rate of more than 1000%.

Furthermore, the present inventors have found that the above-mentioned problems can be effectively solved by using the above-mentioned gap sealant composition for a display device and a display device, thereby completing the present invention.
[14] A method for manufacturing a display device, which is a method for manufacturing a display device having a display panel and a bezel, the display panel having a display surface, the bezel having a frame portion and an open end inside the frame portion, using The frame portion covers a peripheral edge of the display surface side of the display panel, and the manufacturing method of the display device is characterized in that:
The method includes the following steps: For at least a part or all of the entire circumference of the opening portion of the frame, a gap between the frame and the display panel is set to a range of horizontal to 75 degrees at an injection angle with respect to the gap. Inside angle,
The gap sealant composition for a display device according to any one of [1] to [13] is injected and filled.
[15] The method for manufacturing a display device according to [14], characterized in that the following process is performed: at least one point of the entire circumference of the opening portion of the frame, for the frame and the display panel After the gap is disposed, a member having a function of filling the gap without a gap in a direction perpendicular to the display panel is arranged, and then the gap sealant composition is injected and filled.
[16] A display device having a display panel having a display surface,
A frame having a frame portion and an open end inside the frame portion, using the frame portion to cover the peripheral edge of the display surface side of the display panel, and the entire periphery of the opening portion of the frame At least a part or all of the structure in which a gap between the bezel and the display panel is filled with a resin member cured by the gap sealant composition for a display device according to any one of [1] to [13].
Invention effect

According to the present invention, it is possible to provide a gap sealant composition for a display device. Even if it is injected under a bezel, a problem that may exist due to poor curing does not substantially occur. For the recent trend, it is configured to be small / space-saving. The design of a display device with a narrow frame width (ie, a narrow light-shielding film area) is also very suitable. Even if there is a deviation between the display frame and the display panel, the gap can be blocked by an easy and effective mechanism in industrial production. , Effectively inhibits OCR from penetrating into the display module through the gap, so that OCR can be used for optical bonding. Furthermore, by using the gap sealant composition for a display device, it is possible to provide a high-quality and highly reliable display device with improved display performance and durability, and a method for manufacturing the same.

[Gap Sealant Composition for Display Device]

First, a gap sealant composition for a display device of the present invention will be described.

In the present invention, "room temperature" or "normal temperature" is 25 ° C.

In the present invention, the thickeners, solids, and semi-solids formed after the curing reaction between the components of the "reactant" system liquid gap sealant composition include gel-like thickeners and gels. Solids, elastomeric solids, and thermoplastics that show fluidity when heated (for example, above 100 ° C) but are non-flowable at 25 ° C. Furthermore, these reactants may be a curing reactant that substantially completes the curing reaction, or may be a curing reactive reactant having multiple levels of curability of 2 or more (especially including secondary curing and tertiary curing). It may be in a semi-cured state midway. That is, the "reactant" in the present invention may be a cured product that substantially completes the curing reaction, a cured product that substantially completes at least one or more curing reactions but also has curing reactivity, and a curing reaction that has not substantially completed the curing reaction. Either thick or solid semi-cured material. In addition, the semi-cured material may have multiple-level curability of two or more levels. One of the main technical effects of the present invention is the caulking of a display device. Regardless of the degree of curing reaction, whether the reactant has multiple curing properties or not, the physical properties of the liquid composition can be changed at room temperature within a short period of time. To achieve this effect.

In the present invention, "non-flowability" means that it is at least non-liquid, and does not substantially deform and flow under an unloaded state, and preferably does not deform and flow under an unloaded state at 25 ° C. Such a reactant is preferably a cone-plate or parallel-plate type dynamic viscoelasticity measuring device, and the storage elastic modulus (G ') measured at a vibration frequency of 1 Hz is 1,000 Pa or more. In addition, it is preferred that it is substantially difficult to measure the viscosity of the reactant having a non-fluidity after thickening or curing to form a gel-like or solid-state (including elastomer and thermoplastic) reactant. In addition, in the present invention, if it is a non-flowing reactant, it may not substantially complete the curing reaction of at least one level or more. If the fluidity is lost by surface thickening or curing, the curing reaction may not be performed in the deep part. . If it is a non-fluid reactant, the purpose of filling the gap of the display device, which is one of the main technical effects of the present invention, can be achieved.

In the present invention, the "initial viscosity" refers to the mixed viscosity of the entire composition after preparing the composition by mixing the components, 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 preferably a multi-component type (especially a two-component type) composition prepared by mixing the components before use. After the multi-components are mixed, they are in a liquid state and It can be injected into the gap of the display device within a fixed viscosity range.

The gap sealant composition for a display device of the present invention is characterized by containing (A) one or more organopolysiloxanes having a curing reactive functional group in the molecule,
as well as
(B) curing reaction catalyst,
It was liquid at 25 ° C with an initial viscosity in the range of 100 to 100,000 mPa ･ s, and further, a non-flowing reactant was formed within 30 minutes at this temperature.

The composition of the present invention is characterized by its curing characteristics. That is, the composition of the present invention is liquid immediately after the components are mixed, and the initial viscosity at 25 ° C is in the range of 100 to 100,000 mPa ･ s, so it can be injected using a dispenser with an L-shaped nozzle / needle, etc. Into the gap of the display device, especially the gap between the frame and the display panel; on the other hand, it has fast curing or quick-drying curing characteristics, and forms a non-flowing reactant at 25 ° C for less than 30 minutes to achieve The purpose of filling the gap.

If the initial viscosity is within the range, sufficient operability can be achieved as a gap sealant composition for a display device, but from the standpoint of pot life and prevention of outflow to the display module side after filling and filling properties, the initial The viscosity may be in the range of 500 to 50,000 mPa ･ s, and more preferably in the range of 750 to 30,000 mPa ･ s. In view of practicality, the viscosity is particularly preferably in the range of 1000 to 25,000 mPa ･ s. If the initial viscosity is lower than the lower limit, in the curing characteristics of fast curing or quick drying, the fluidity is high, and the problem of outflow to the display module side after injection may occur, especially the problem of poor filling in the vertical direction. . On the other hand, if the initial viscosity exceeds the upper limit, thickening / curing is excessively performed during the injection operation, and a sufficient pot life cannot be ensured during the injection process.

The formation of a non-flowing reactant within 30 minutes means that the time point after the composition according to the present invention is prepared by a mixing operation or the like is set as a starting point (= 0 minutes), even if no other curing operation is performed at room temperature ( For example, curing operations such as ultraviolet irradiation or heating and adding water), after at least 30 minutes have elapsed, at least one level of curing reaction is performed before the liquid composition becomes a non-flowing reactant state. In addition, the composition can be changed to a non-flowing reactant at any time point (for example, 15 minutes, 20 minutes, 25 minutes, etc.) before 30 minutes have elapsed, and a curing reaction can be further performed after 30 minutes or more.

Furthermore, it is particularly preferable that the composition according to the present invention has a starting point (= 0 minutes) after the composition of the composition according to the present invention is prepared by a mixing operation or the like, and after at least 30 minutes, a cone plate or a parallel plate is used. The plate-type dynamic viscoelasticity measuring device measures the storage elastic modulus (G ') of a reactant composed of the composition at a vibration frequency of 1 Hz to be 1000 Pa or more.

Regarding the time required for the composition of the present invention to become a non-flowing reactant or the time required for the storage elastic modulus (G ') to reach a value of 1,000 Pa or more, the components (A), The type and amount of the component (B) or the type and amount of the inhibitor for the curing system of the composition (for example, the curing inhibitor for the curing system including a hydrosilylation reaction) are selected or controlled. For example, if the component (A) undergoes a curing reaction at room temperature in the presence of the component (B), by increasing the amount of the component (B), not adding an inhibitor to the component (B), or adopting it, the pot life before injection can be ensured The minimum amount can be used to design the fast curing or fast drying curing characteristics of the composition.

In addition, as described above, the composition according to the present invention needs to be kept in a liquid state during the process of injecting into the gaps of the display device, especially the gap between the frame and the display panel, to ensure the pot life. Regarding the timing of forming the composition according to the present invention, for example, the composition can be stored in a multi-component form such as two liquids, and when the composition is to be injected, it can be selected by mixing. For example, they can be mixed with a mixer or the like before injecting the components, filled into a dispenser within the applicable period, and injected into a desired location. In addition, in this case, the mixing reaction does not become the starting point of the above-mentioned curing reaction to form a non-flowable reactant (= 0 minutes), so although it still depends on the process and injection operation time, it should be less than 3 minutes after mixing, Preferably, a non-flowing reactant is not formed within 5 minutes. In this way, by designing a composition that can ensure a sufficient pot life at room temperature and has fast-curing or quick-drying curing characteristics, it can suppress problems such as liquid clogging and poor discharge during injection, and can smoothly implement the present invention. invention.

On the other hand, when implementing the present invention, a dispenser having a liquid raw material tank and a mixing mechanism may be used. The liquid raw material tank is physically provided with a partition. The mixing mechanism supplies and discharges from each raw material tank. The liquid raw materials are mixed in a fixed amount. By using such a dispenser equipped with a tank mechanism and a mixing mechanism capable of separating and filling raw material liquid, each component of the composition according to the present invention can be filled into a tank that is physically separated, and a fixed amount can be used during dispensing. Mix and drain. In this case, since the time lag between the discharge time and the mixing time can be practically zero, the composition can be formed and injected into the desired portion. Therefore, assuming that the above-mentioned mixed composition has a short pot life, it can be used without any problems. The manufacturing method of the composition and display device concerning this invention is implemented. That is, since the composition according to the present invention can select a mixing mechanism and an injection timing, it is an essential factor to ensure an applicable period at room temperature. In addition, a dispenser having such a structure is sold in the market. As an example, a dispenser having a discharge nozzle provided on a plastic 2-tank made by MIX-PAC can be exemplified.

Then, the composition according to the present invention contains the following component (A) and component (B).

The component (A) is one or more organic polysiloxanes having a curing-reactive functional group in the molecule, and may include any one or a combination of the following organic polysiloxanes.
Organic polysiloxanes having one or two or more curing reactive functional groups in the molecule Two or more organic polysiloxanes having curing reactive functional groups different from each other have the same curing reactive functional groups but bonding sites Of two or more organic polysiloxanes, each of which is different in content, content, and siloxane skeleton

Examples of the curing-reactive functional group of the component (A) include arbitrary curing-reactive functional groups such as a hydrosilylation-reactive group, a radical-reactive group, and a condensation-reactive functional group. Particularly preferred is a carbon-carbon double bond. Hydrosilylation reactive group or radical reactive group; hydrosilylation reactive group with silicon atom bonded to hydrogen group; condensation reactive group selected from hydroxyl, alkoxy, fluorenyloxy, oximeoxy . The radical-reactive group includes a high-energy-ray-reactive group such as ultraviolet rays. The component (A) involved in the present invention may be an organic polysiloxane containing one curing reactive group in the molecule, or an organic polysiloxane containing two or more different curing reactive groups in the molecule, or It is a mixture of different types of curing reactive functional groups / bonding sites / contents / silicone skeletons and different organopolysiloxanes.

The component (A) according to the present invention is particularly preferably exemplified.
(A1) an organopolysiloxane having a curing reactive group containing a carbon-carbon double bond,
(A2) an organopolysiloxane having a condensation-reactive group, and
(A3) an organohydrogenpolysiloxane having a silicon atom bonded to a hydrogen atom,
In the present invention, a composition containing at least one or more organopolysiloxanes selected from the component (A1) and the component (A2) is preferred. 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 a hydrosilylation curable component, and is preferably an organic polysiloxane mixture containing both the component (A1) and the component (A3).

The component (A1) is an organopolysiloxane having a curing-reactive group containing a carbon-carbon double bond, and examples thereof include linear, branched, cyclic, or dendritic groups containing the curing-reactive group in the molecule as follows. (Reticulated) organic polysiloxane, the curing reactive group selected from vinyl, allyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, Alkenyl groups having 2 to 20 carbon atoms, such as decenyl, undecenyl and dodecenyl; groups containing acrylic acid such as 3-propenyloxypropyl and 4-propenyloxybutyl; Groups containing methacrylic acid, such as 3-methacryloxypropyl and 4-methacryloxyoxybutyl. Particularly preferred is an organopolysiloxane having a curing reactive group selected from a vinyl group, an allyl group, or a hexenyl group and containing a carbon-carbon double bond.

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

The component (A1) is preferably the following average composition formula:
R ¹ _a R ² _b SiO _{(4-ab) / 2}
Indicated as an organopolysiloxane or a mixture thereof.
In the formula, R ¹ is the above-mentioned curing reactive group containing a carbon-carbon double bond,
R ² is a group selected from the above-mentioned monovalent hydrocarbon groups 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 satisfying the following conditions: 1.5 ≦ a + b ≦ 2.5 and 0.005 ≦ a / (a + b) ≦ Number of 0.2. The reason is that when a + b is above the lower limit of the above range, the flexibility of the cured product is improved. On the other hand, when a + b is below the upper limit of the above range, the mechanical strength of the cured product is increased, a / (a When + b) is above the lower limit of the above range, the mechanical strength of the cured product is increased. On the other hand, when a / (a + b) is below the upper limit of the above range, the flexibility of the cured product is improved.

In the composition according to the present invention, it is particularly preferred that the component (A1) contains
(A1-1) A linear or branched organic polysiloxane having an alkenyl group only at the molecular chain end, and any
(A1-2) An alkenyl group-containing organic polysiloxane resin having at least one branched siloxane unit in the molecule and having an ethylene (CH ₂ = CH-) group content within a range of 1.0 to 5.0% by mass.

Component (A1-1) has only the end of the molecular chain
(Alk) R ² ₂ SiO _1/2
(In the formula, Alk is an alkenyl group having 2 or more carbon atoms). The other siloxane units are essentially linear or branched siloxane units composed of siloxane units represented by R ² ₂ SiO _2/2 . Chain organic polysiloxane. R ² represents the same group as described above. In addition, including the terminal siloxane unit, the siloxane polymerization degree of the component (A1-1) is in the range of 7 to 1002. Such a component (A1-1) is particularly preferably a linear organic polysiloxane blocked with a siloxane unit represented by (Alk) R ² ₂ SiO _1/2 at both ends of the molecular chain.

The component (A1-2) is an alkenyl-containing organic polysiloxane resin, and an average unit formula can be exemplified:
(RSiO _3/2 ) o (R ₂ SiO _2/2 ) p (R ₃ SiO _1/2 ) q (SiO _4/2 ) r (XO _1/2 ) s
Represents an alkenyl-containing organic polysiloxane resin.
In the above formula, R is selected from the group consisting of 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, at least the ethylene (CH ₂ = CH-) group content in the organic polysiloxane resin satisfies the range of 1.0 to 5.0% by mass. R is an alkenyl group, and RSiO _1/2 is particularly preferred. At least a part of R on the siloxane unit is 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 a number in the range of 0 to 10, q / ( o + r) is a number in the range of 0 to 5, (o + r) / (o + p + q + r) is a number in the range of 0.3 to 0.9, and s / (o + p + q + r) is in the range of 0 to 0.4. Within the number.

As the component (A1-2), it is particularly preferably exemplified
((Alk) R ² ₂ SiO _1/2 ) q1 (R ² ₃ SiO _1/2 ) q2 (SiO _4/2 ) r
(In the formula, Alk and R ² are the same groups as 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 organic polysilicon. Number of ethylene (CH ₂ = CH-) group content in the oxane resin satisfying the range of 1.0 to 5.0% by mass)
The alkenyl-containing MQ organopolysiloxane resin.

By using the component (A1-1) having an alkenyl group only at the molecular chain end and the component (A1-2), which is an organic polysiloxane resin having a fixed amount of an alkenyl group, a gap sealant for a display device can be provided The composition can form a curing reaction product having excellent fast-curability / quick-drying properties and excellent mechanical strength and flexibility as a whole, and is particularly suitable for gap sealing applications of display devices.

The component (A3) is an organohydrogenpolysiloxane having a silicon atom bonded to a hydrogen atom, preferably a component having at least two silicon atoms bonded to a hydrogen atom in the molecule and functioning as a crosslinking agent of the component (A1).

Examples of such a component (A3) include 1,1,3,3-tetramethyldisilaxane, 1,3,5,7-tetramethylcyclotetrasiloxane, and tris (dimethylhydrosilyl) (Oxy) methylsilane, tris (dimethylhydrosiloxy) phenylsilane, trimethylsiloxy-terminated methylhydropolysiloxanes at both ends of the molecular chain, and trimethylsilane at both ends of the molecular chain Dimethylsiloxane-terminated dimethylsiloxane-methylhydrosiloxane copolymer, two ends of molecular chain Dimethylsiloxane-methylhydrosilane copolymer terminated with dimethylhydrosiloxy, methylhydrosiloxane-diphenyl terminated with trimethylsiloxy at both ends of the molecular chain Hydrolyzation of trisiloxanes, methylhydrosiloxanes-diphenylsiloxanes-dimethylsiloxanes, trimethoxysilanes at both ends of the molecular chain Condensate, copolymer consisting of (CH ₃ ) ₂ HSiO _1/2 units and SiO _4/2 units, (CH ₃ ) ₂ HSiO _1/2 units, SiO _4/2 units, and (C ₆ H ₅ ) SiO Copolymer composed of _3/2 units and a mixture of two or more of these.

In the composition according to the present invention, the component (A3) particularly preferably contains
(A3-1) A linear or branched organic hydrogen polysiloxane having a silicon-bonded hydrogen atom only at the molecular chain end, and any
(A3-2) A linear or dendritic organopolysiloxane having at least three silicon-bonded hydrogen atoms in the molecule.

The component (A3-1) is an organohydrogenpolysiloxane having a silicon-bonded hydrogen atom only at the end of the molecular chain, and functions as a chain length extender in a silylation reaction with the component (A1), which can improve The flexibility of the curing reaction. Such a component (A3-1) is preferably a linear organic hydrogen polysiloxane, and it is preferable to use one represented by the following structural formula.
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 each represent a methyl group and a phenyl group, m1 is a number from 1 to 100, and n1 is a number from 1 to 50.

The component (A3-2) is a linear or dendritic organohydrogenpolysiloxane having at least 3 silicon-bonded hydrogen atoms in the molecule. By using the above component (A3-1) together, the composition can be realized. Fast curing.

Examples of the straight-chain organic hydrogen polysiloxanes include methyl hydrogen polysiloxane terminated with trimethylsiloxy at both ends of the molecular chain, and trimethylsiloxy terminated at both ends of the molecular chain. Methylsiloxane-methylhydrosiloxane copolymer, dimethylhydrosiloxane-terminated dimethylsiloxane-methylhydrosiloxane copolymer at both ends of molecular chain, both ends of molecular chain Methylhydrosiloxane-diphenylsiloxane copolymer terminated with trimethylsiloxy, methylhydrosiloxane-diphenyl terminated with trimethylsiloxy at both ends of the molecular chain Siloxane-dimethylsiloxane copolymer.

On the other hand, the dendritic organohydrogen polysiloxane includes at least a branched siloxane unit selected from the group consisting of SiO _4/2 units (Q units) and R ³ SiO _3/2 units (T units). Self-contained R ³ ₃ SiO _1/2 unit (M unit), R ³ ₂ HSiO _1/2 unit (M ^H unit) and any R ³ ₂ SiO _1/2 unit (D unit), R ³ HSiO _1/2 Unit (D ^H unit)
M ^H MQ, M ^H Q, M ^H MT, M ^H T, M ^H MQT, M ^H QT, M ^H MDQ, M ^H MDD ^H Q, M ^H DQ, M ^H DD ^H Q, M ^H MDT, M ^H MDD ^H T, M ^H DT, M ^H DD ^H T, M ^H MDQT, M ^H MDD ^H QT, M ^H DQT, M ^H DD ^H QT More than one type of organic hydrogen polysiloxane resin.
In the formula, R ³ is a methyl group or a phenyl group.

In the composition according to the present invention, the content of the component (A3) is preferably in the range of 0.1 to 10 mol relative to the carbon-carbon double bond in the component (A1), and the silicon-bonded hydrogen atom is in the range of 0.1 to 10 mol. The amount is preferably an amount in the range of 0.2 to 5.0 mol, and particularly preferably an amount in the range of 0.5 to 2.0 mol. If the content of the component (A3) is below the lower limit, poor curing may result; if the content of the component (A3) exceeds the upper limit, the mechanical strength of the cured product will be too high, which may result in the failure to obtain an elastomer or a gel. Cured reactants.

In the composition according to the present invention, it is particularly preferable that the component (A) is more than the component (A1) containing the above-mentioned component (A1) from the viewpoint of the gap sealing property in the display device, especially the fast-curing / quick-drying property and the normal balance of the cured product. -1) 100 parts by mass and the component (A1) of 0 to 20 parts by mass of the above-mentioned component (A1-2), containing the above-mentioned component (A3-1) with respect to ethylene in the components (A1-1) and (A1-2) Groups are 1 mole in total, the amount of silicon-bonded hydrogen atoms is 0.1 to 10 moles, preferably 0.2 to 5.0 moles, more preferably 0.5 to 2.0 moles, and the above component (A3-2) is relatively The vinyl groups in the components (A1-1) and (A1-2) total 1 mole, and the silicon-bonded hydrogen atom is in an amount of 0 to 1 mole, preferably in an amount of 0 to 0.5 mole, and more preferably 0.1. ~ 0.5 mol of organopolysiloxane.

In the composition according to the present invention, the component (A) may be (A2) an organopolysiloxane having a condensation-reactive group, and particularly may contain only a molecular chain terminal having a group selected from the above-mentioned hydroxyl group, alkoxy group, An organic polysiloxane (A2-1) having one or two or more kinds of condensation reactive groups of a methoxy group and an oxime group. The related condensation-reactive component (A2) can be used together with the hydrosilylation-reactive organopolysiloxane such as the above-mentioned component (A1). As a curing agent described later (B), it is designed by using a large amount of a condensation reaction catalyst, etc. By using the component (A2), the fast-curing / fast-drying curing characteristics required for the present invention can be designed.

The component (B) is a curing reaction catalyst, and is a component that causes a curing reaction functional group of the component (A) to undergo a curing reaction. Examples of such a component (B) include a hydrosilylation catalyst, a photopolymerization initiator, a peroxide, or a condensation reaction catalyst. When used as a gap sealant composition for a display device, it is often heated or has a large amount of high energy. Irradiation of the wire is difficult, so it is preferable to include a hydrosilylation catalyst or a condensation reaction catalyst.

When the component (A) contains the above-mentioned component (A1), preferably contains both the above-mentioned component (A1) and component (A2), and has a curing reactive functional group which is cured by the hydrosilylation reaction, (B1) the hydrosilylation catalyst system The component which causes a curing reaction, especially in the use of the present invention, preferably contains
(B1-1) a first hydrosilylation catalyst exhibiting activity in a composition without irradiating high energy rays; and
(B1-2) Curing reaction catalyst of the second hydrosilylation reaction catalyst that exhibits activity in the composition by irradiating high energy rays, but does not show activity, (B1-1) component The mass ratio to the component (B1-2) is in the range of 100/0 to 5/95.

Here, examples of the high energy rays include ultraviolet rays, X-rays, and electron beams. Among them, ultraviolet rays are preferred in terms of catalyst activation efficiency. In addition, the irradiation amount varies depending on the type of the high-energy-ray-active catalyst, and in the case of ultraviolet rays, the cumulative irradiation amount at a wavelength of 365 nm is preferably within a range of 100 mJ / cm ² to 10 J / cm ² .

The component (B1-1) is a first hydrosilylation catalyst that exhibits activity in the composition without irradiating high energy rays. When it does not contain a hydrosilylation reaction inhibitor or contains a small amount, this component is a hydrosilylation catalyst that can provide the fast-curing / quick-drying curing characteristics required by the composition, and examples thereof include platinum-based catalysts and rhodium. Based catalyst, palladium based catalyst, nickel based catalyst, iridium based catalyst, ruthenium based catalyst, and iron based catalyst, platinum based catalyst is preferred. Examples of the platinum-based catalyst include platinum fine powder, platinum black, platinum-supported silicon dioxide fine powder, platinum-supported activated carbon, chloroplatinic acid, an alcohol solution of chloroplatinic acid, and an olefin complex of platinum. And platinum-based compounds such as platinum alkenyl siloxane complexes, and platinum alkenyl siloxane complexes are particularly preferred. Examples of the alkenylsiloxane include 1,3-divinyl-1,1,3,3-tetramethyldisilaxane, 1,3,5,7-tetramethyl-1,3, 5,7-tetravinylcyclotetrasiloxane, substituted with ethyl, phenyl, etc., part of the methyl group of these alkenyl siloxanes, and substituted with allyl, hexenyl, etc. These alkenylsiloxanes are vinyl alkenylsiloxanes. In particular, considering the stability of the platinum-alkenylsiloxane complex, 1,3-divinyl-1,1,3,3-tetramethyldisilazane is preferred. In addition, in order to improve the stability of the platinum-alkenyl siloxane complex, it is preferable to add 1,3-divinyl-1,1,3,3-tetramethyldisilazane to the complex, 1,3-diallyl-1,1,3,3-tetramethyldisilazane, 1,3-divinyl-1,3-dimethyl-1,3-diphenyldisilazine Oxane, 1,3-divinyl-1,1,3,3-tetraphenyldisilazane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinyl It is particularly preferable to add an alkenyl siloxane such as alkenyl siloxane such as cyclotetrasiloxane and an organic siloxane oligomer such as dimethyl siloxane oligomer.

The component (B1-1) is a catalyst that exhibits activity in a state where it is not irradiated with high energy rays, and among these, it is preferable to exhibit activity at a relatively low temperature. Specifically, in a temperature range of 0 to 200 ° C, it exhibits activity in a composition and promotes a hydrosilylation reaction. The content of the component (B1-1) varies according to the type of catalyst and the type of composition. Usually, the amount of metal atoms in the catalyst is in the range of 0.01 to 50 ppm relative to the composition in terms of mass units. From the viewpoint of the fast-curability / quick-drying property of the present invention, it is particularly preferable to use (B1-1-1) an alkenyl siloxane complex of platinum, and the platinum content is preferably an amount in the range of 1.5 to 30 ppm. . If the added amount of the component (B1-1) is too small, the objects of the present invention such as rapid curing cannot be achieved; if the added amount is too large, the pot life is too short, which is inconvenient in practical use and uneconomical.

The component (B1-2) is a second hydrosilylation catalyst that does not show activity if it is not irradiated with high energy rays, but exhibits activity in the composition by irradiating high energy rays. It is also called so-called high energy ray activation. Catalyst or light activated catalyst.

Specific examples of the component (B1-2) include (methylcyclopentadienyl) trimethyl platinum (IV), (cyclopentadienyl) trimethyl platinum (IV), (1,2, 3,4,5-pentamethylcyclopentadienyl) trimethyl platinum (IV), (cyclopentadienyl) dimethyl ethyl platinum (IV), (cyclopentadienyl) dimethyl Acetyl platinum (IV), (trimethylsilylcyclopentadienyl) trimethyl platinum (IV), (methoxycarbonylcyclopentadienyl) trimethyl platinum (IV), (dimethyl Phenylsilylcyclopentadienyl) trimethylcyclopentadienyl platinum (IV), trimethyl (acetamidinepyruvate) platinum (IV), trimethyl (3,5-heptanedione acid) Platinum (IV), Trimethyl (methylacetoacetate) platinum (IV), Bis (2,4-pentanedionate) platinum (II), Bis (2,4-hexadionate) platinum (II) ), Bis (2,4-heptanedione acid) platinum (II), bis (3,5-heptanedione acid) platinum (II), bis (1-phenyl-1,3-butanedione acid) Platinum (II), bis (1,3-diphenyl-1,3-propionedionate) platinum (II), bis (hexafluoroacetamidinepyruvate) platinum (II), among these, from general purpose From the viewpoints of properties and ease of acquisition, (methylcyclopentadienyl) trimethyl platinum (IV) and bis (2,4-pentanedionate) platinum (II) are preferred.

The component (B1-2) is an arbitrary component in the composition, and a secondary curing property can be imparted to a reactant obtained by the component (B1-1) by irradiating high energy rays (hereinafter, also referred to as ("Curable"), in addition to irradiating high-energy rays simultaneously under the presence of the component (B1-1), especially in areas where the light cannot be sufficiently radiated, such as under a frame, It can assist the curing reaction. For non-flowing reactants, in addition to further curing reaction, compared with the use of (B1-1) alone, it can further achieve rapid curing / quick drying. The content thereof is an amount required for further hardening the composition with respect to the reactant obtained by the above-mentioned sufficient (B1-1), or an amount sufficient to improve the rapid curing / quick-drying properties, and is preferably relative to the composition 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.

In such a composition design having photocurability, the mass ratio of the component (B1-1) to the component (B1-2) is preferably within a range of 90/10 to 5/95, and more preferably 85/15 to 10 / Within 90. If the mass ratio is below the upper limit, the curing reaction by irradiating high energy rays can be accelerated; if the mass ratio is lower than the lower limit, the curing reaction cannot be performed in a short period of time at low temperature such as room temperature, that is, The fast-curing / quick-drying curing characteristics required by the composition may not be achieved. In addition, for irradiating high energy rays, for example, a point-shaped UV light source can be used when irradiating ultraviolet rays, and the composition is injected into the gap of the display device, and then the surroundings of the composition are irradiated with ultraviolet rays.

When the component (B1-2) is contained as a hydrosilation catalyst that is a high-energy ray-activated catalyst or a light-activated catalyst, the composition according to the present invention may be designed to further have the following characteristics: if the composition is prepared immediately after the preparation is completed Irradiation of high energy rays will form non-flowing reactants at 25 ° C for less than 20 minutes. Even if such a composition is injected under a frame where it is difficult to effectively irradiate high-energy rays, etc., by using auxiliary light irradiation such as a point-shaped UV light source, rapid curing and quick-drying properties can be further achieved. The gap sealant composition for a display device is extremely useful. In addition, the timing and amount of irradiation of the high energy rays in the composition of the present invention are arbitrary. When the composition is actually used, the high energy rays can be irradiated immediately after preparation, or the high energy rays can be irradiated after a certain period of time. In addition, the practical irradiation amount and the irradiation amount for defining the above-mentioned characteristics are as described above, but they are not limited to this in actual use.

The composition according to the present invention preferably does not contain a hydrosilylation inhibitor. Generally, in order to extend the pot life of a composition and obtain a stable composition, a hydrosilylation inhibitor is added to the composition. However, in the present invention, the addition of a hydrosilylation inhibitor does not slow down the curing reaction of the composition, which is not preferable. However, in order to ensure the pot life in the injection process, the required minimum amount of the hydrosilylation inhibitor can be added.

In the composition according to the present invention, when the component (A) has a condensation-reactive group, the component (B) may be a catalyst containing a (B2) condensation reaction catalyst. The catalyst for such a condensation reaction is not limited, and examples thereof include organic tin compounds such as dibutyltin dilaurate, dibutyltin diacetate, tin octoate, dibutyltin dioctoate, and tin laurate; tetrabutyl titanate, tetratitanate Organic titanium compounds such as propyl ester, dibutoxybis (ethyl acetate); other acidic compounds such as hydrochloric acid, sulfuric acid, dodecylbenzenesulfonic acid; basic compounds such as ammonia, sodium hydroxide; 1,8- Amine compounds such as diazabicyclo [5.4.0] undecene (DBU) and 1,4-diazabicyclo [2.2.2] octane (DABCO) are preferably organic tin compounds and organic titanium compounds.

The amount of the component (B2) used is an amount required to impart the fast-curing / quick-drying curing characteristics required for the composition. In addition, if the necessary fast-curing / quick-drying curing characteristics can be achieved by the component (B1), the component (B2) can be used arbitrarily, but by using the component (B2) together, the reactants can be reacted with time. Deep curing, as a gap filler composition for display devices, can further improve the caulking effect.

The composition according to the present invention may be added with other organic polysiloxanes, adhesion-imparting agents, silicon dioxide, glass, alumina, zinc oxide and other inorganic substances to the organic polysiloxane composition used in the present invention as required. Fillers; fine powders of organic resins such as polymethacrylate resins; phosphors, heat-resistant agents, dyes, pigments, flame-retardant imparting agents, solvents, etc. The amount and method of addition are well known to the industry.

The composition according to the present invention has fast-curing / quick-drying curing characteristics, so it is preferably a multi-component type composition having two or more components. Especially when the component (A) is a hydrosilylation-curable organopolysiloxane, and includes the component (A1) and the component (A3), it is preferable to design these components as a multi-component type composition having two or more components in different packages. Use, mix before use, or use a dispenser with a mixing mechanism when discharging as described above, and inject it into the gap of the target display device.

More specifically, this composition can be prepared by uniformly mixing the above-mentioned component (A), component (B), and other optional components as needed at room temperature.

It is particularly preferable that the composition is a two-component type (= 2 liquid type) composition having at least hydrosilylation curability,
The liquid I component contains at least the component (A1) and the component (B), and optionally contains other components,
The liquid II component contains at least the component (A2),
They are sealed in airtight containers at room temperature for long-term storage. As mentioned above, after mixing these components, it is liquid and has a fixed initial viscosity, and has fast curing properties.

One of the features of the present invention is to use the composition as a gap sealant composition for a display device. It is particularly preferred that the display device is an image display device having a bezel and a display panel, and is used to fill the bezel and the display panel. Composition. In addition, the use for the above purpose includes: for a gap between the inlay and the display panel, using a silicone resin member cured by the composition as the gap having the gap filled in the gap perpendicular to the direction of the display panel The building blocks of its function.

The composition according to the present invention is preferably cured to form an elastomer resin member or a gel-like resin member. As for the cured silicone member, the penetration degree (hereinafter, referred to as abbreviation) specified in JIS K2220 at 25 ° C The “penetration degree” is preferably within a range of 5 to 70, and the penetration degree is more preferably within a range of 10 to 60 and within a range of 20 to 50. Such a silicone resin member has moderate flexibility and durability, and excellent adhesion / adhesion retention and followability between members. Therefore, when used as a gap sealant composition for a display device, a reliable caulking effect can be achieved .

The composition according to the present invention is used to fill the gap generated at the overlapping portion of the frame and the display surface. Therefore, it is preferable to form a resin member which is cured and has sufficient adhesiveness and sufficient deformation of the sample at the maximum adhesive strength. Specifically, for the cured silicone resin member, the tensile shear adhesive strength (hereinafter, referred to simply as “shear adhesive strength”) measured at 25 ° C. in accordance with JIS K6850 is preferably 0.05 MPa or more, and more preferably It is within a range of 0.05 to 10 MPa, and may be within a range of 0.1 to 5 MPa in practical use. In addition, with respect to the resin member, the tensile shear displacement relative to the thickness of the sample at the peak value of the tensile shear adhesive strength (= maximum adhesive strength) is measured. The displacement ratio is preferably 1000% or more, and the ratio is preferable in practical use. It is within the range of 1000 to 6000%. By using a resin member with sufficient deformation of the sample under such adhesiveness and maximum adhesive strength, the members are firmly adhered, and even if some deformation occurs, the blocking material will not peel from the member and no gap will occur, so When used as a gap sealant composition for a display device according to the present invention, a reliable caulking effect can be achieved.

[Manufacturing method of display device and display device]
The present invention relates to a method for manufacturing a display device and a display device, and one of the characteristics is to use the gap sealant composition for a display device.

Hereinafter, embodiments of the present invention (hereinafter, simply referred to as "embodiments") will be described with reference to the drawings. In this specification and the drawings, the same reference numerals are used for substantially the same constituent elements even though they are slightly different. The shapes depicted in the drawings are drawn for the understanding of the industry, so they may not be consistent with the actual size and ratio. The cross-sectional view shows only the cross-section, and the depth structure is omitted. The “equipment” in this specification and the scope of patent application also includes the case where there are elements that are not explicitly stated. The same applies to "have" and "include". The "resin member" refers to a silicone resin member obtained by curing the gap sealant composition.

First, a display device obtained using the manufacturing method of the present invention will be described based on Embodiment 1 of the present invention described in FIGS. 1 and 2.

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 open end 22 inside the frame portion 21, and the display surface of the display panel 10 is covered with the frame portion 21. The bezel 20 on the peripheral edge of the 11 side is provided on the display panel 11 side of the display panel 10 with the bezel 20 sandwiched therebetween, and is located directly below the open end 22 of the bezel 20 in a direction perpendicular to the display surface 11 A resin member 40 that fills a gap 72 generated at an overlapping portion of the bezel 20 and the display surface 11 without a gap, and an OCR 50 that is filled between the display surface 11 and the front panel 30. Here, the display surface 11 refers to the entire surface on the front panel 30 side of the polarizing plate 12 (the same applies hereinafter).

The CF substrate 13 and the TFT substrate 14 are opposed to each other via a liquid crystal (not shown), and polarizing plates 12 and 15 are respectively provided on the outside of the CF substrate 13 and the TFT substrate 14 to constitute a display panel 10. A 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), thereby forming a display module 70. The display module 70 is fully bonded to the front panel 30 such as a touch panel via the OCR 50. Here, the resin member 40 is provided with no gap in a direction perpendicular to the display surface 11 with respect to the gap 72 generated at the overlapping portion of the bezel 20 and the display surface 11. In this structure, the resin member 40 is only provided at the overlapping portion of the bezel 20 and the display surface 11, so it has no effect on the display area 18 substantially. It is assumed that the bezel 20 has a narrow width structure, and it is not included in the completed display device. Display unevenness may occur, which can improve the display quality, especially the display quality and operability near the end of the frame. Furthermore, the resin member 40 fills the bezel 20 and the display surface 11 without any gap in the vertical direction, which can effectively suppress the overflow of the OCR50, and indeed achieve the so-called "sealing" purpose, improve the durability of the display device, and reduce the number of defective products during production. Yield, further improving yield and display quality.

In addition, as described above, the resin member 40 has a structure in which the bezel 20 and the display surface 11 are filled without a gap in the vertical direction, and does not have a structure that spans the display area 18 and the bezel 20, so the display area 18 can be made in this structure. It is maximized, and no protrusions and uneven structures derived from the resin member 40 are generated on the frame 20. Therefore, compared with the structure proposed in Patent Document 2 and the like, the resin member crosses the frame 20 and blocks the gap 72. The unevenness and the size (height) of the frame are less likely to deviate, and the distance between the surface 23 of the frame 20 and the front panel 30 in FIG. 2 can be kept constant, so that it can be maintained by the adhesive member 60 disposed on the outer periphery of the frame 20. The front panel 30 is arranged with high flatness to prevent appearance defects and poor adhesion. In addition, the resin member 40 used to fill the gap 72 under the bezel 20 has a reliable caulking effect, so the OCR 50 does not overflow under the display panel 10 and the backlight unit 71.

As shown in FIG. 3A and FIG. 3B, the display device according to the first embodiment can be obtained by a manufacturing method of a display device having the following process, that is, the injection angle becomes an angle in the range of horizontal to 75 degrees with respect to the gap 72. The process of filling the gap sealant composition for filling the display device of the present invention. As proposed in Patent Document 2, etc., if the injection angle with respect to the gap 72 is vertical, as shown in FIG. 5, the structure becomes a gap generated by blocking the overlapping portion of the frame 20 and the display surface 11 from the outside, and the gap is filled. Insufficiently, the OCR50 will overflow under the display panel 10 and the backlight unit 71. This case is verified in a reference example with respect to the embodiments described later.

Here, as a mechanism for injecting the gap sealant composition for a display device at an injection angle of horizontal to 75 degrees with respect to the gap 72, it is preferable to use a device having one selected from an L-shape, a substantially L-shape, or a flexible discharge port. An injection device for at least one discharge port. More specifically, in the method for manufacturing a display device of the present invention, it is preferable to use a syringe or a dispenser equipped with an L-shaped nozzle, a substantially L-shaped nozzle, or a flexible nozzle, so that the injection angle becomes horizontal (= 0 (Degree) to 75 degrees, more preferably the angle of injection angle to be horizontal (= 0 degrees) to 45 degrees, particularly preferably the angle of injection angle to be horizontal (= 0 degrees) to 30 degrees, and most preferably substantially relative to the gap 72 A process of injecting the gap sealant composition for a display device into the gap 72 with a horizontal (= 0 degree) injection angle. Such an injection device provided with an L-shaped nozzle or the like is, for example, a commercially available syringe or dispenser equipped with an L-shaped needle (Musashi Curve needle CPN-18G-A90 manufactured by Musashi Engineering Co., Ltd.).

In addition, as shown in FIG. 2, a short-distance square obstacle structure is arranged in a state where the upper frame 20 is arranged. Therefore, a straight needle cannot be used for substantially horizontal injection, and an injection with a flexible nozzle is required. Device, the flexible nozzle can be bent into an L-shaped nozzle / needle, a substantially L-shaped nozzle / needle, or a rubber nozzle / needle.

More specifically, in this manufacturing method, first, along the open end 22 of the bezel 20, on the display surface 11 of the display panel 10, a dispenser device having an L-shaped nozzle is used to discharge the opening relative to the gap. 72. The gap sealant composition for the display device is constantly and quantitatively injected into the display device at a constant rate in a horizontal direction (FIG. 3A). At the same time, a point-shaped UV light source is used to irradiate UV light along the injection track of the blocking material, and the frame 20 and the display surface A resin member 40 is formed inside the gap 72 generated at the overlapping portion of 11 (FIG. 3B). In addition, the gap sealant composition for a display device according to the present invention has fast-curing / quick-drying curing characteristics, and therefore forms a non-flowing reactant before being irradiated with UV light, and the reactant is further cured by being irradiated with UV light. It is also possible to omit the irradiation of UV light. In addition, when injecting a curable resin composition as a blocking material, it is particularly preferable to inject at a constant rate and in a constant state with the tip of the L-shaped nozzle inserted into the inside of the gap 72.

In the manufacturing method and the display device according to the present invention, the gap sealant composition for a display device which can be used to fill the gap generated at the overlapping portion of the frame and the display surface, and the curing method thereof are as described above. Curing is achieved within time, and from the standpoint of not adversely affecting the various components of the display device, a curing system that uses UV light for photocuring (including the use of a photoreactive hydrosilylation catalyst) as the main curing method is preferably selected.

In addition, in the display device of Embodiment 1, the size is not particularly limited, and the design size from the open end of the frame to the display area is generally 0.1 to 10 mm, and preferably in the range of 0.2 to 5 mm. For example, with respect to the design size of the open end 22 to the display area 18 of the frame 20 is 1.5 mm, the display module 70 may be designed as follows: the gap 72 between the display panel 10 and the frame 20 is 0.2 mm, and the thickness of the frame 20 is Within 0.3 mm. However, due to various deviations, if the bezel 20 is directly arranged on the display panel, 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, will have a large deviation. When the gap sealant composition for a display device is quantitatively injected, the gap 72 may be poorly filled. If there is such a poor filling, the gap 72 cannot be fully blocked, and after the OCR is injected, the OCR will seep into the display module from the gap, leakage occurs, and the display quality and durability of the display device may be reduced.

In the present invention, the gap sealant composition for a display device is injected so that the discharge port is substantially horizontal with respect to the gap 72, so that the gap 72 is blocked from the vertical direction (FIG. 5, Patent Document 1 or Patent Document 2). Compared with this, such a poor filling problem is less likely to occur, but in order to more reliably fill the gap between the bezel and the display panel and achieve reliable filling, the following manufacturing method of a display device is preferably used.

That is, the gap between the frame and the display panel originates from the height difference of the frame. Do not directly arrange the two. Instead, arrange in the gap between the frame and the display panel in advance. The gap-filling function member is filled in a gap, and then the gap sealant composition is filled for filling, thereby eliminating or reducing the height deviation of the gap between the bezel and the display panel.

In addition to the function of maintaining the height of the components to be fixed, this type of component has physical or chemical affinity for the gap sealant composition injected, so that it can prevent leakage in the vertical direction. The end point can achieve more effective caulking.

Such a member may be a resin member cured by curing the same or different curable resin composition as the resin member filling the gap between the bezel and the display panel, and it is preferably a gap sealant composition for a display device according to the present invention. Cured polysilicone resin component. When a frame with a step is arranged on the display panel, the resin members become temporary supports between the two members and have the function of adjusting the height of the gap. Therefore, it is preferably two or more points, more preferably three, compared to one point. More than four points, particularly preferably four or more points. Most preferably, the resin member is arranged on four corners or at least four points are located on a substantially diagonal line. Especially when these resin members are the same as the resin members cured by curing the curable resin composition injected to fill the gap between the frame and the display panel, if the uncured curable resin composition injected from the discharge port is in contact with the arrangement At the beginning or end point (including the intermediate point) of the resin member at the time of injection, the interface between the two has a good affinity for the interfacial tension. Therefore, the curable resin composition diffuses uniformly throughout the entire gap area injected. It is less likely to shift, and can effectively suppress filling defects that occur with so-called "shrink marks." In other words, the resin member used as a holding material and the resin member used to fill the gap between the frame and the display panel are selected from the resin member cured by curing the same curable resin composition, so that the resin member can be prevented from moving to a part during filling. Offset causes poor filling, which can fill the entire gap area more reliably.

In other words, the method for manufacturing a preferred display device according to the present invention is characterized by including a process in which at least one point of the entire circumference of the opening portion of the inlay frame, a gap between the inlay frame and the display panel is configured with After filling the function of the gap without any gap along the direction perpendicular to the display panel, it is injected at an angle within the range of horizontal to 75 degrees with respect to the injection angle of the gap over the entire periphery of the opening of the frame. The gap sealant composition for a display device of the present invention fills a gap between the inlay frame and the display panel.
When a frame is arranged on the display surface of the display panel, it is preferable to set one point on each of the four corners or the vertical and horizontal axes of the opening portion, for a total of four or more points. A resin member provided to fill a gap between members with a gap. After the holding material composed of these resin members is set on the display surface, a frame with a height difference is arranged, so that the distance from the display surface of the display panel to the surface of the frame, that is, the height of the gap can be effectively adjusted to suppress the deviation or make the deviation Minimize, and further improve the affinity to the gap sealant composition according to the present invention, can effectively suppress the leakage in the vertical direction, and function as the starting point or the end point during the injection, thereby suppressing the injected gap seal The agent composition flows to cause filling failure. Therefore, when the gap sealant composition of the present invention is injected at a constant rate and in a fixed amount at an injection angle of horizontal to 75 degrees with respect to the gap, the gap filling failure can be further suppressed, and reliable filling can be achieved.

More specifically, as shown in FIG. 4, at the end of the display surface 11 of the display panel 10 according to the first embodiment of the present invention and when the bezel 20 is arranged, the portion that becomes the inside of the open end 22 thereof is arranged in advance by a resin member The resin member 41 (FIG. 4A), which is a holding material (a gap sealant composition for a display device of the present invention), is provided with the bezel 20 (FIG. 4B) while maintaining the height by the holding material. Thereby, the distance from the display surface of the display panel to the bezel surface, that is, the height of the gap 72 can be effectively adjusted, and the gap sealant composition injected into the entire periphery afterwards can be suppressed from being poorly filled. Although not shown, the inlay frame 20 is a quadrangle, and the same gap 72 is adjusted in advance at its four corners or at one point or more, for a total of four or more points, so that the gap is horizontally relative to the gap ~ When the injection angle of 75 degrees is constant and the gap sealant composition of the present invention is quantitatively injected, the gap filling failure can be further suppressed, and reliable filling can be achieved.

In addition, in the manufacturing method and the display device according to the present invention, the curable resin composition used for forming the resin member that is a gap-retaining material is not particularly limited, and can be used in combination with the curable resin composition that is the blocking material. The illustrated materials are the same or different. From the standpoint of the simplicity of the work process, the same curable silicone resin composition as that preferably exemplified as the gap sealant composition can be used and is preferably used.

From the viewpoint of effectively adjusting the height of the gap, it is preferable that the height of the resin member as a holding material at each point be substantially the same. However, the resin member obtained by curing the curable resin composition may be an adhesive elastomer or a gel-like cured product. By using such an elastomer or a gel-like cured product, even if the resin member is slightly different in height, When the bezel is placed on the resin member, the resin member is deformed, 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 and a related process for bonding a display panel to a front panel using a curable resin composition as an OCR.

That is, in the manufacturing method according to the present invention, after the process of injecting and filling a curable resin composition into the gap between the frame and the display panel,
Which further includes:
A process of coating the display panel side of the display panel with the same or different curable resin composition as described above, and sandwiching the frame with the display surface side coated with the curable resin composition The process of applying the front panel in the state.
In the present invention, the silicone resin member cured by the gap sealant composition for a display device can surely achieve the purpose of filling the OCR, that is, the curable resin composition, and prevent the OCR from being applied when the OCR is applied or injected. The gap leaks and penetrates into the inside of the display module. Therefore, the obtained display device can achieve high display quality and durability, suppress defects during manufacturing, and improve yield.

In the first embodiment of the present invention, after filling the gap 72 with the resin member 40, the OCR50 is fully coated, the adhesive 60 is applied to the entire periphery of the outer frame 20, and the touch panel as the front panel 30 is subjected to a reduced pressure environment. Fully fit, then formally cure by UV irradiation. Through these series of manufacturing processes, the display device 101 shown in FIG. 2 is completed. Except for the process of filling the gap 72 by the blocking material, that is, the resin member 40, and the process of adjusting the height of the gap 72 in advance by using the holding material, the manufacturing process of the display device 101 according to Embodiment 1 is based on conventional optics. The bonding process has the versatility of the optical bonding process of the display device.

In addition, in the manufacturing method of the first embodiment, the gap sealant composition for a display device for forming a resin member as a blocking material and a resin member as a holding material of the gap 72 are both irradiated with UV while being applied, so that It is temporarily cured, but if the viscosity of the gap sealant composition for these display devices is very high and the coating shape can be maintained for a fixed time, it can be irradiated with UV after the entire coating, or the operation of temporarily curing UV can be omitted. . In addition, in the manufacturing method and the display device according to the present invention (the first embodiment), the resin members are formed directly below the bezel 20, that is, outside the display area. The curing of the resin members essentially solves the problem. Problems such as boundaries are easily found due to the refractive index difference of the OCR used for optical bonding. In other words, the present invention (for example, Patent Document 1 or Patent Document 2) has a problem with display quality and performance degradation caused by the refractive index difference between the resin member and the OCR disposed to block the gap 72. The present invention Provides countermeasures that can be solved essentially.

In addition, in the manufacturing method of the first embodiment, the OCR coating process (for optical bonding) or the bonding process required for manufacturing a display device having a front panel is not limited to the implementation under the reduced pressure environment, but also Adhesion methods well known under atmospheric pressure can be used. For example, it can be a method of applying OCR to the front panel side in an atmospheric pressure environment, and inverting the front panel to attach it to the display module (reverse bonding method), or ensuring a predetermined gap between the front panel and the display module and Arrange in parallel, fill the gap with OCR (gap allocation method), etc.

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 open end 22 and the display panel 10 is completely filled by the resin member 40, and the resin member 40 is formed under the bezel 20, so that the uncured OCR50 is not damaged during the manufacturing process. Since it does not penetrate into the display module 70, a display device 101 with high display reliability can be provided. Further, the resin member 40 does not involve a display area, so that the problems of deterioration in display quality and display performance at the end due to the difference in refractive index between the OCR and the OCR can be essentially solved, and the operability is lowered due to this. And other issues.

In addition, according to the first embodiment, the distance between the open end 22 and the gap 72 of the display panel 10 is fixed in advance by the resin member 41 as a holding material in advance, and the display device of the present invention is improved. The affinity of the gap sealant composition can function as the starting point / end point at the time of injection. Therefore, when the gap sealant composition is continuously and quantitatively injected into the gap 72, the purpose of reliable caulking can also be achieved. Industrial production Excellent sex. In addition, the resin member 40 is formed under the bezel 20, and when the front panel 30 is arranged on the bezel 20, the resin member 40 used for caulking will not cause unevenness, which can prevent appearance defects and adhesion when the front panel is installed. bad.

In addition, in the first embodiment, the display panel 10 and the front panel 30 have a structure that is fully bonded by OCR, and the structure may be changed to a structure that is bonded via an air layer (air gap bonding).

In the first embodiment, an adhesive member 60 is disposed on the bezel 20. The purpose is to improve the resistance to the peeling of the front panel 30 and the OCR 50 when the external force F in the peeling direction acts on the OCR 50 on the display surface 11. As a result, when the front panel 30 having a larger outer shape than the display module 70 is bonded, the bonding and reinforcement can be surely performed, and no stress is caused to cause the OCR 50 on the display surface 11 to peel off. In addition, for the purpose of reinforcement, it is preferable that the adhesive strength of the adhesive member 60 is stronger than OCR50. If the adhesive strength is equal to or higher than OCR50, a fixed reinforcing effect can be obtained. When the OCR 50 has high adhesive strength, the adhesive member 60 may not be provided. That is, in the first embodiment, the adhesive member 60 is an arbitrary constituent element. In addition, when a mask substrate or the like provided with a conductive layer is further interposed 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 is preferably a display having a structure in which the display surface and the front panel are substantially filled with a transparent optical elastomer resin member or an optical gel-like resin member. Device. By using such an optical elastomer resin member or an optical gel-like resin member as an OCR for optical bonding, the display performance and durability of the display device can be improved, and a highly reliable display device can be provided.

Such OCR is preferably made by curing a curable resin composition, and can be exemplified to have physical properties related to the displacement ratio with respect to the thickness of the sample under the penetration, shear adhesive strength, and maximum adhesive strength, by including UV irradiation Cured polysiloxane resin (member) formed by light curing.

Such OCR is not particularly limited, and commercially available products such as EG-1200, EG-4131, VE-6001 UV manufactured by Dow Corning Toray, and SilGel 612 PT, LUMISIL 100, and LUMISIL 102 manufactured by Wacker Corporation can be used. In addition, the gap sealant composition of the present invention can also be used as an OCR, to minimize the difference in physical properties such as the refractive index and hardness, or to further improve the adhesion and sealability.

In the manufacturing method and the display device according to the present invention, the display device may further include:
Furthermore, a mask substrate provided on a surface opposite to the display surface of the front panel and having a surface on which a transparent conductive film is formed,
A display device having 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) of the first embodiment, a mask such as an EMI (Electro-Magnetic Interference) substrate with a conductive layer on one side can be inserted between the display module 70 and the front panel 30. Substrate. Such a shield substrate has an electromagnetic wave shielding function, so that the front panel 30 can be prevented from malfunctioning by the electromagnetic wave emitted from the display module 70. In addition, a uniform or mesh-shaped conductive layer made of a transparent conductive film such as ITO (Indium Tin Oxide) is formed on one surface of the mask substrate. Then, in order to set the potential of the conductive layer to the GND of the display module 70, a conductive adhesive member such as Ag paste may be used to form an adhesive member 60 to be disposed on the outer periphery of the bezel 20. In addition, the bezel 20 of the display module 70 is made of metal, and GND connection is performed in the display module 70. Here, by using the adhesive member 60 as a conductive material, a GND connection between the metal frame 20 and the conductive layer of the mask substrate can be surely performed, so that a display device having strong electromagnetic wave resistance can be provided.

As mentioned above, although this invention was demonstrated with reference to the said embodiment, this invention is not limited to each said embodiment. Various changes that can be understood by those skilled in the art can be applied to the constitution and details of the present invention. In addition, the present invention also includes a combination of a part or all of the configurations of the above-described embodiments as appropriate.

For example, in each embodiment, the case of the UV curing type is described as the OCR for full bonding, but it is not limited to this, and a heat curing type, a moisture curing type, or a composite curing type thereof may also be obtained. The same effect. In addition, as long as the technical effect of the present invention is not impaired, a structure may also be adopted: a blocking material is provided on the outside of the polysilicone resin member that fills the gap between the bezel and the display panel as a blocking material, and A structure in which one or all of the gaps are blocked. For example, if a part of the upper frame of the artisan uses a special shape, and the gap cannot be completely blocked by the above method, the curable resin composition as a blocking material can be injected into the part by precise positioning.

Furthermore, the case where the shape of the front panel is a quadrangle has been described, but it does not need to be a quadrangle, but may be an arbitrary polygon, a flat plate having a curved portion, or a combination of these, and may also be a three-dimensional shape.
Examples

Hereinafter, a method for manufacturing a display device of the present invention will be described in more detail with reference to examples and comparative examples. However, the present invention is not limited to the description of the following examples. The display devices manufactured according to the following examples are included in the scope of the present invention, but the display devices of the present invention are not limited to the descriptions of the following examples.

[Each component]
The following components were used in the examples and comparative examples, and the composition of the composition is shown in Tables 1 and 2.
• (a1-1-1) ～ (a1-1-7) Vi Siloxanes at both ends (n = X): Dimethylpolysiloxy terminated with dimethylvinylsiloxy at both ends of the molecular chain The number of alkane and dimethylpolysiloxane units (D unit: (siloxane unit represented by (CH ₃ ) ₂ SiO _2/2 )) is X (in this embodiment, n = 37, 272, 382, 400 , 404, 460, and 660 are represented by the following structural formulas:
(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
Represented Organic Polysiloxane Resin • (a3-1-1) CE-SiH Siloxane:
Structural formula H (CH ₃ ) ₂ SiO-((CH ₃ ) ₂ SiO) ₂₀ -Si (CH ₃ ) ₂ H
The organohydrogen polysiloxane represented by the SiH group only at the end. (A3-1-2) CE-SiH Silane:
Structural formula H (CH ₃ ) ₂ SiO-((C ₆ H ₅ ) ₂ SiO) -Si (CH ₃ ) ₂ H
An organohydrogenpolysiloxane with a SiH group only at the end is shown. (A3-2-1) XL-SiHsiloxane:
Structural formula (CH ₃ ) ₃ SiO-((CH ₃ ) ₂ SiO) ₂₈ (H (CH ₃ ) SiO) ₂₈ -Si (CH ₃ ) ₃
A linear organic hydrogen polysiloxane containing three or more SiH groups on the side chain of the molecular chain represented by (a3-2-2) XL-SiH siloxane:
Structural formula {H (CH ₃ ) ₂ SiO _1/2 } ₆₀ {(C ₆ H ₅ ) SiO _3/2 } ₄₀
Represented dendritic organohydrogen polysiloxane with more than 3 SiH groups in the molecule • (b1-1-1) Pt: 1,3-divinyl-1,1,3,3-tetramethyl of platinum Disiloxane compound (curing catalyst for hydrosilylation reaction at 25 ℃, alkenyl siloxane compound of platinum)
• (b1-2-1) UV-Pt: (methylcyclopentadiene) trimethyl platinum (IV) complex (curing reaction catalyst for hydrosilylation reaction by irradiation with ultraviolet (UV))

[Gap Sealant Compositions for Display Devices of Examples 1 to 9 and Comparative Examples 1 to 9]
Using a static mixer, the components were uniformly mixed according to the compositions shown in Tables 1 and 2, and the compositions related to the examples and comparative examples were prepared. Except for the curing reaction catalyst of component (B), the numbers of each component in the table are parts by mass. The table also shows the following values and measurement results.
• SiH (CE) / Vi: For linear or branched organic hydrogen polysiloxanes with silicon-bonded hydrogen atoms only at the end of the molecular chain, 1 mole compared to the vinyl group in other components, silicon-bonded Molar number of hydrogen atom • SiH (XL) / Vi: For linear or dendritic organohydrogenpolysiloxanes having at least 3 silicon-bonded hydrogen atoms in the molecule, the total amount of vinyl groups in other components is 1 Moore, Molar number of silicon-bonded hydrogen atoms • Pt (ppm): Platinum content derived from platinum alkenyl siloxane complex • UV-Pt (ppm): derived from (methylcyclopentadiene ) Platinum content of trimethyl platinum (IV) complex • Initial viscosity: After preparing the composition, the initial viscosity (mPa · s) was measured at 25 ° C using a rheometer (AR550) manufactured by TA Instruments. For Geometry, a flat plate with a diameter of 20 mm is used. The viscosity is a value of a shear rate of 20 (1 / s).
• 2x viscosity arrival time: After preparing the composition, use a rheometer (AR550) made by TA Instruments to measure the viscosity at 25 ° C every minute, and record the time (minutes) to reach 2 times the initial viscosity. The viscosity is a value of a shear rate of 20 (1 / s).
• Penetration: After more than 2 hours, in fact, after the curing reaction is completed, for the cured silicone component, PENETROMETER RPM-101 manufactured by Clutch Co., Ltd. is used to measure the penetration of JIS K2220 according to JIS K2220.
• G'1000Pa arrival time: After preparing the composition, a rheometer (AR550) manufactured by TA Instruments was used. For Geometry, a 20 mm diameter plate was used to measure the storage elastic modulus every minute at 25 ° C with a vibration frequency of 1 Hz. Count G 'and record the time (minutes) it takes for the G' of the reactant to reach 1000 Pa. In addition, the measurement was performed in the same manner when there was ultraviolet irradiation (light irradiation).
With or without liquidity after 30 minutes:
After each composition was uniformly mixed at room temperature with a static mixer, the composition was discharged into a horizontal plate shape. After standing at 25 ° C for 30 minutes, the plate was tilted to confirm the presence or absence of fluidity. When no flow was observed after tilting the plate, it was evaluated as "non-flowing".
• With light, with or without mobility after 20 minutes:
After the components are uniformly mixed at room temperature with a static mixer, the components are discharged into a horizontal plate shape. A 2W high-pressure mercury lamp with a glass filter for suppressing ozone generation is used at 25 ° C, and the ultraviolet radiation amount at 365 nm becomes 5000mJ / cm. The method of ² was irradiated with ultraviolet rays, and the plate was tilted after standing for 20 minutes to confirm the presence or absence of fluidity. When no flow was observed after tilting the plate, it was evaluated as "non-flowing".
• Shear adhesive force (MPa) and shear adhesive elongation (%)
For Examples 1 to 6, the shear adhesive force (MPa) and shear adhesive elongation (%) were further measured by the following methods, and are shown in Table 1.
Measurement method: A gap sealant (cured material) for a display device with a thickness of 200 µm and a sample thickness of 200 μm is bonded between two glass plates in a square range of 25 mm × 25 mm, and a universal material testing machine ( Autograph AGS-1kNG (made by Shimadzu Corporation) was stretched horizontally from both sides at a test speed of 100 mm / min to measure the peak value of shear adhesion (MPa). Furthermore, the horizontal displacement corresponding to the peak value of shear adhesion (MPa) in this test is divided by the thickness of the sample (200 µm), and the obtained value is multiplied by 100 to obtain the shear adhesion elongation (% ) Are shown in Table 1.

[Table 1]

[Table 2]

The contents of the hydrosilylation catalysts of Examples 1 to 9 and the corresponding Comparative Examples 1 to 9 are different, especially the content of the (b1-1-1) component having hydrosilylation activity at 25 ° C. In the examples with a large amount of platinum, the liquid composition with an initial viscosity in the range of 1100 to 21,000 mPa ･ s after mixing is in the range of 3 to 14 minutes to reach twice the initial viscosity, so it has sufficient The applicable period, and can form non-flowing reactants within 30 minutes. In addition, in Examples 5 to 7 and 9 containing a photoactive platinum catalyst, ultraviolet rays were simultaneously irradiated, so that a curing reaction could be achieved more quickly, and a non-flowing reactant was formed within 20 minutes. On the other hand, in the comparative example, it still has fluidity after 30 minutes at 25 ° C, it takes more than 18 minutes to reach twice the initial viscosity, and the curing speed is slow. If it is used as the gap sealant composition for the display device of the present invention May cause insufficient gap filling, or flow out from the gap and penetrate into the display module.

[Lamination model test of display device]
In order to evaluate the bonding quality of the display device, a model test as shown below was performed.
A 50 mm × 50 mm × 1 mm glass plate (A) was made to imitate the display, and a 55 mm × 55 mm × 1 mm acrylic frame (B ), And make a 55 mm × 55 mm × 1 mm glass plate (C) by imitating the front panel. Spacers with a height of 1.7 mm are arranged on the four corners of the display portion A to ensure a gap with the frame B. The frame B is adhered and cured on the display portion A according to the method of the examples and comparative examples. After that, OCR is filled in the space formed in the central portion of the display portion A and the bezel B, and the front panel C is bonded. Observe whether the filled OCR leaks from the gap between the display portion A and the frame B when the front panel C is bonded, so as to evaluate the joint quality of the frame B (no sealing failure, no gaps around the entire frame B It is bonded to the display part A).
In addition, in Example 11 of the present invention, the gap sealant composition for a display device of Example 5 described above is used, and the compositions of Examples 1 to 4, 6 to 9 can also be used in the same manner.

[Example 10]
While mixing the gap sealant composition (hereinafter, also referred to as "UV-curable adhesive") for the display device of Example 5 with a static mixer, fill it into Musashi Clear syringe PSY-10E, and install it in an automatic dispenser ( SHOTMASTER 300 DS-S (made by Musashi Engineering Co., Ltd.), and then an 18G standard needle is attached.

With a discharge pressure of 500 kPa, the UV-curable adhesive is discharged to the four corners of the display section A (from the apex, inside 7 mm on each side) one by one. The UV-curable adhesive is arranged so that the center of the frame B is aligned with the display section A. fit. At this time, at each point (four corners), a gap between the display portion A and the frame B is filled with a UV curable adhesive in a direction perpendicular to the display portion A.

Replace the needle with an L-shaped needle (Musashi Curve needle CPN-18G-A90), and set the tip of the needle at a position more than 1 mm into the gap between the display A and the frame B, with a discharge pressure of 500 kPa, 1.8 The coating speed of mm / s is applied to the four sides to apply UV curable adhesive, so that the UV curable adhesive previously arranged at the four corners is used as the starting point / end point of the coating, and the points are connected, and then 365 nm UV 2J is irradiated so that The adhesive is cured, and the bezel B is bonded to the display portion A.

While mixing OCR (EG-1200 by Dow Corning Toray) with a static mixer, fill 5g to the central part of the space formed by the display part A and the frame B, so that the front panel C is parallel to the display part A and the frame B. The joint body is center-aligned and adheres slowly without air bubbles. Starting from the joining boundary between the frame B and the front panel C, press the front panel C toward the frame B to pressure the OCR to leak, and then place it at room temperature. 30 minutes for OCR to cure.

The gap between the display portion A and the bezel B was inspected all around, and no OCR leakage was observed at all.

[Reference Example 1]
The UV curable adhesive was not applied to the four corners of the display part A in advance, and the front end of the 18G standard needle was set so as not to contact the inner edge of the central cut-out part of the bezel B with a discharge pressure of 500 kPa and a coating speed of 1.8 mm / s. Apply UV curable adhesive to the four sides of the central cutout, irradiate 365 nm UV 2J to cure the adhesive, and join the frame B to the display A. The other operations are the same as in Example 1. The frame B was pressure-bonded, and left at room temperature for 30 minutes to cure the OCR. In Comparative Example 1, a gap between the display portion A and the bezel B was coated with a UV curable adhesive in a vertical direction.

OCR leakage was observed from the gap between the display portion A and the bezel B.

[Reference Example 2]
The UV curable adhesive was not applied to the four corners of the display part A in advance, and the front end of the 18G standard needle was set so as not to contact the inner edge of the cut-out part of the bezel B, with a discharge pressure of 500 kPa and a coating speed of 0.9 mm / s. Apply UV curable adhesive to the four sides of the central cutout, irradiate 365 nm UV 2J to cure the adhesive, and join the frame B to the display A. The other operations are the same as in Example 1. The frame B was pressure-bonded, and left at room temperature for 30 minutes to cure the OCR. In Comparative Example 2, a gap between the display portion A and the bezel B was coated with a UV-curable adhesive in the vertical direction, and the coating was applied at a double coating speed of Example 10 and Reference Example 1 to double the coating amount. cloth.

Although no OCR leakage was observed from the gap between the display portion A and the bezel B, the bonding of the display portion A and the front panel C was not parallel, and the gap between the bezel B and the front panel C was uneven on each side.

[Experiment summary]
The following are for the presence or absence of OCR leakage,
• The installation accuracy of the front panel, that is, whether there is unevenness in the gap between the frame and the front panel due to the application of the UV curable adhesive is shown in Table 3 according to its relationship with the experimental conditions.
[table 3]

As shown in Table 3, in Example 10, four-point coating was performed with a UV curable adhesive, which is a gap sealant composition for a display device of the present invention, in order to fill the gap between the bezel and the display portion in a vertical direction in advance, and The adhesive (resin member) obtained by the coating was used as a starting point / end point, and an L-shaped needle was used to inject a UV-curable adhesive at a constant rate from the horizontal direction. In Example 10, there was no OCR leakage. Also, the problem of poor front panel installation did not occur, and a display device with excellent reliability could be manufactured, which was proved by model tests.

On the other hand, when a well-known technique is used to inject a UV curable adhesive into the gap from the direction perpendicular to the gap to block the gap, as described in Reference Example 1, a small amount of coating cannot prevent OCR from leaking and the gap filling is insufficient. As described in Reference Example 2, if a large amount of coating is applied, in addition to the installation failure between the components caused by the UV curable adhesive, a large amount of UV curable adhesive is present around the frame, and display unevenness may occur at the ends. problem.
Industrial availability

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

101 ～ 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 area

20‧‧‧ Frame

21‧‧‧Frame

22‧‧‧ open end

23‧‧‧ surface

30‧‧‧Front panel (touch panel)

31‧‧‧Mask panel

32‧‧‧sensing glass

33‧‧‧FPC substrate

40 ～ 42‧‧‧Resin members

50‧‧‧OCR (optical elastic resin)

60‧‧‧ Adhesive member

70‧‧‧display module

71‧‧‧ backlight unit

72‧‧‧ Clearance

91‧‧‧ Dispenser device with L-shaped nozzle

94‧‧‧ Nozzle

FIG. 1 is a partial cross-sectional view showing a display device according to the first embodiment.

FIG. 2 is an exploded perspective view showing the display device according to the first embodiment.

3A is a partial cross-sectional view showing a manufacturing process of injecting a resin member into the gap 72 of the display module according to the first embodiment using an L-shaped nozzle from a horizontal direction. 3B is a partial cross-sectional view showing a structure in which a resin member is longitudinally filled in a gap of the display module according to the first embodiment by a horizontal injection method.

FIG. 4A is a view showing a state in which a resin member is arranged in a vertical direction in order to fill the gap 72 in order to suppress the dimensional deviation of the gap 72 of the display module according to the first embodiment, and is used as the starting point / end point of the subsequent injection of the curable resin. Partial sectional view. 4B is a partial cross-sectional view showing a state in which a resin member is injected into the gap 72 of the display module according to the first embodiment in order to fill the gap 72 in the vertical direction, and then the gap 72 is adjusted in the vertical direction.

5 is a partial cross-sectional view showing a manufacturing process of injecting a resin member into the gap 72 of the display module of the comparative embodiment from a vertical direction using a nozzle.

Claims (16)

A gap sealant composition for a display device, comprising: (A) one or more organic polysiloxanes having a curing reactive functional group in a molecule, as well as (B) curing reaction catalyst, It was liquid at 25 ° C with an initial viscosity in the range of 100 to 100,000 mPa ･ s, and further, a non-flowing reactant was formed within 30 minutes at this temperature. The gap sealant composition for a display device according to claim 1, wherein the component (A) contains at least an organic polysiloxane selected from (A1) having a curing reactive group containing a carbon-carbon double bond and ( A2) One or more organopolysiloxanes among the organopolysiloxanes having a condensation-reactive group. The gap sealant composition for a display device according to claim 1 or 2, wherein the component (A) contains at least (A1) an organopolysiloxane having a curing reactive group containing a carbon-carbon double bond, and (A3) an organohydrogenpolysiloxane having a silicon atom bonded to a hydrogen atom; Ingredient (B) contains at least (B1) catalyst for hydrosilylation reaction; The silicon-bonded hydrogen atom is in the range of 0.1 to 10 moles with respect to 1 mole of the carbon-carbon double bond in the composition. The gap sealant composition for a display device according to any one of claims 1 to 3, wherein the component (B) contains (B1-1) a first hydrosilylation catalyst that exhibits activity in a composition without irradiating high energy rays, and (B1-2) A second hydrosilylation catalyst that does not exhibit activity unless irradiated with high energy rays, but exhibits activity in the composition by irradiating high energy rays Curing reaction catalyst, the mass ratio of component (B1-1) to component (B1-2) is in the range of 90/10 to 5/95, Furthermore, it has the following characteristics: if the high-energy rays are irradiated immediately after the preparation of the composition is completed, a non-flowable reactant is formed within 25 minutes at 25 ° C. The gap sealant composition for a display device according to any one of claims 1 to 4, wherein the component (A) is an organopolysiloxane containing the following components: (A1-1) Only the end of the molecular chain has an olefin Based on 100 parts by mass of linear or branched organic polysiloxane, (A1-2) has at least one branched siloxane unit in the molecule, and the content of ethylene (CH ₂ = CH-) group is 1.0 to 5.0% by mass 0 to 20 parts by mass of an alkenyl-containing organic polysiloxane resin within the range of (A3-1) a linear or branched organic hydrogen polysiloxane having a silicon-bonded hydrogen atom at the molecular chain end only The vinyl groups in the components (A1-1) and (A1-2) total 1 mole, the silicon-bonded hydrogen atom is 0.1 to 10 moles, and (A3-2) has at least 3 silicon bonds in the molecule. The linear or dendritic organohydrogen polysiloxane containing a hydrogen atom is 1 mole to the vinyl group in the components (A1-1) and (A1-2), and the silicon-bonded hydrogen atom is 0 to 1 mole. The amount. The gap sealant composition for a display device according to any one of claims 1 to 5, wherein the component (B) contains (B1-1-1) Alkenyl siloxane complex of platinum, and (B1-2-1) selected from (substituted and unsubstituted cyclopentadienyl) trimethyl platinum (IV), β-diketonate trimethyl platinum (IV), bis (β-diketone) ) The curing reaction catalyst of at least one of platinum (II), the mass ratio of the component (B1-1-1) to the component (B1-2-1) is in the range of 90/10 to 5/95. The gap sealant composition for a display device according to any one of claims 1 to 6, wherein the component (A) contains (A2-1) only a molecular chain terminal having a member selected from the group consisting of a hydroxyl group, an alkoxy group, and a hydroxyl group. One or two or more organic polysiloxanes, which are polycondensation reactive groups of an organic oxime group, Component (B) contains (B2) a condensation reaction catalyst. The gap sealant composition for a display device according to any one of claims 1 to 7, wherein the component (B) contains (B1-1-1) an alkenyl siloxane complex of platinum, and is derived from the The platinum content of 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 claims 1 to 8, wherein the display device is an image display device including a bezel and a display panel, and the gap sealant composition is used for Fill the gap between the bezel and the display panel. The gap sealant composition for a display device according to any one of claims 1 to 9, wherein the following reactant is formed at 25 ° C within 30 minutes after the composition is prepared, that is, using a cone plate or a parallel plate type The dynamic viscoelasticity measuring device has a storage elastic modulus (G ') measured at a vibration frequency of 1 Hz of 1,000 Pa or more. The gap sealant composition for a display device according to any one of claims 1 to 10, wherein the initial viscosity at 25 ° C is in a range of 100 to 100,000 mPa ･ s, and further, the flow can be maintained at this temperature. Sex for at least 3 minutes. The gap sealant composition for a display device according to any one of claims 1 to 11, which can form a cured polysiloxane having a penetration of a cured product in a range of 5 to 70. The gap sealant composition for a display device according to any one of claims 1 to 12, which can form a shear adhesive strength of 0.05 MPa or more, and a displacement ratio relative to the sample thickness at the maximum adhesive strength of 1000% or more Polysiloxane cured. A method for manufacturing a display device is a method for manufacturing a display device having a display panel and a bezel, the display panel having a display surface, the bezel having a frame portion and an open end inside the frame portion, using the frame Partly covers the peripheral edge of the display surface side of the display panel, and the manufacturing method of the display device is characterized in that: The method includes the following steps: For at least a part or all of the entire circumference of the opening portion of the frame, a gap between the frame and the display panel is set to a range of horizontal to 75 degrees with an injection angle relative to the gap. Inside angle, The gap sealant composition for a display device according to any one of claims 1 to 13 is injected and filled. The method for manufacturing a display device according to claim 14, wherein the manufacturing process is as follows: at least one point of the entire circumference of the opening portion of the inlay frame, for the gap between the inlay frame and the display panel, After filling the functional members without gaps in a direction perpendicular to the display panel, the gap sealant composition is injected for filling. A display device having a display panel having a display surface, A frame having a frame portion and an open end inside the frame portion, covering the display surface side peripheral edge of the display panel with the frame portion, and The gap between the bezel and the display panel is at least a part or all of the entire circumference of the opening of the bezel, and the gap sealant composition for a display device according to any one of claims 1 to 13 is requested. Filled structure of cured resin components.