JP5294077B2 - Substrate laminate and method for separating the substrate laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a substrate laminate produced by stacking and integrating a thin glass substrate and a support substrate, the laminate facilitating the separation process of the thin glass substrate from the support substrate and preventing contamination on the surface of the thin glass substrate upon separation. <P>SOLUTION: The substrate laminate 1 is produced by stacking and integrating a thin glass substrate 2 and a support glass substrate 3, wherein an adhesive 6 composed of a water-insoluble adhesive resin that peels by impregnation with water is applied over the entire surface between the thin glass substrate 2 and the support glass substrate 3. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a thin glass substrate used for a display substrate such as a liquid crystal display substrate or an organic EL display substrate, or an illumination substrate such as an organic EL illumination substrate. Specifically, the thin glass substrate and a support substrate are laminated. It is related with the board | substrate laminated body integrated.

  As is well known, thinning and lightening are required for display devices such as liquid crystal display devices and organic EL display devices, and lighting devices such as organic EL lighting devices. Therefore, the actual situation is that the thinning of the glass substrate used in the apparatus is promoted. However, as the thickness of the glass substrate is reduced, a decrease in strength and the occurrence of bending are unavoidable. Therefore, the thin glass substrate alone cannot be put into an existing manufacturing process. In addition, with a thin glass substrate alone, the handling itself is difficult due to the above-described decrease in strength and the like, which causes a problem of reducing work efficiency.

  Therefore, the thin glass substrate is put into a manufacturing process in the state of a substrate laminate bonded to another support substrate, and a predetermined process is performed. After the series of processes is completed, the thin glass substrate and the support substrate are combined. A method of separation has been proposed.

  That is, for example, in Patent Document 1, it is possible to manufacture a substrate laminate by bonding a thin glass substrate to a support substrate via an adhesive layer having an adhesive force that can be repeatedly applied and peeled off. It is disclosed. As the prior art, paragraph 0007 discloses that a glass substrate is bonded to a support substrate with a water-soluble silicone resin.

  Patent Document 2 discloses that a substrate laminate is manufactured by attaching only a peripheral portion of a thin glass substrate to a support substrate with a thermosetting resin interposed therebetween. When the thin glass substrate is separated, the thin glass substrate is taken out by cutting and removing the vicinity of the end portion of the laminated body including the peripheral portion where the thermosetting resin is interposed.

Japanese Patent Laid-Open No. 8-86993 JP 2006-220757 A

  However, in the method disclosed in Patent Document 1, when the adhesive layer is provided with an adhesive force sufficient to fix the thin glass substrate to the support substrate, it is difficult to separate the thin glass substrate from the support substrate. However, there is a possibility that the thin glass substrate may be broken during the separation. Further, when such a re-adhesive pressure-sensitive adhesive layer is used, a part of the pressure-sensitive adhesive material tends to remain on the thin glass substrate even after separation. For this reason, not only the adhesive material itself remaining on the surface of the thin glass substrate becomes dirty, but also the problem that the foreign matter such as surrounding dust is adsorbed by the adhesive force, and the contamination becomes worse.

  In addition, as disclosed in the prior art section of Patent Document 1, when a water-soluble silicone resin is used for adhesion between the support substrate and the thin glass substrate, the substrate laminate having the configuration is water-treated. When immersed in water, the components of the silicone resin dissolve into the water. Therefore, there is a high possibility that dirt derived from the silicone resin dissolved in water adheres to the surface of the separated thin glass substrate, and it becomes difficult to maintain the cleanliness of the thin glass substrate.

  On the other hand, in the method disclosed in Patent Document 2, when the thin glass substrate and the support substrate are separated, it is necessary to cut the vicinity of the end portion of the laminate including the peripheral portion interposed with the thermosetting resin. Therefore, troublesome and complicated work is required for the separation work. In addition, the surface of the thin glass substrate may be contaminated by chips generated during cutting.

  An object of the present invention is to facilitate separation of a thin glass substrate and a support substrate in a substrate laminate in which a thin glass substrate and a support substrate are laminated and integrated, and at the time of separation, the surface of the thin glass substrate It is a technical problem to prevent contamination from occurring.

  The present invention devised to solve the above problems is a substrate laminate in which a thin glass substrate and a support substrate are laminated and integrated, and water is provided between the thin glass substrate and the support substrate. It is characterized by interposing a water-insoluble adhesive that peels off when included.

  According to such a configuration, since the adhesive is peeled off by including water only by immersing the substrate laminate in water, the thin glass substrate and the support substrate can be easily separated. And since the said adhesive agent is water-insoluble, the situation that the component of an adhesive agent melt | dissolves in the water which immersed the board | substrate laminated body can be suppressed reliably. Therefore, the stain | pollution | contamination originating in an adhesive agent does not adhere to the thin glass substrate isolate | separated in water. Therefore, the cleanliness of the surface of the thin glass substrate after separation can be reliably ensured.

  In the above configuration, an adhesive resin can be used as the adhesive.

  Said structure WHEREIN: It is preferable to interpose the said adhesive agent over the whole surface between the said thin glass substrate and the said support substrate.

  In this way, the thin glass substrate can be reliably fixed to the support substrate. Further, if the adhesive is interposed over the entire surface between the thin glass substrate and the support substrate, the adhesive is formed as if a portion where no adhesive is interposed is formed between the thin glass substrate and the support substrate. The change part of the wall thickness of is not formed. Therefore, it is possible to reliably prevent a situation in which the surface of the thin glass substrate undulates as the thickness of the adhesive changes. As a result, since the surface of the thin glass substrate can be kept flat, various processes such as film formation can be accurately performed on the thin glass substrate.

  Said structure WHEREIN: It is preferable that the film for scattering prevention is affixed on the single side | surface or both surfaces of the said thin glass substrate.

  In this way, even if the thin glass substrate is damaged during the manufacturing process or when it is incorporated in the final product such as a display device or a lighting device, it prevents the broken pieces from scattering around. Can do.

  In the above configuration, a transparent electrode film may be formed on one surface of the thin glass, or a film for preventing scattering is attached to one surface of the thin glass, and the transparent electrode film is formed on the other surface. May be formed.

  As described above, according to the present invention, since the adhesive interposed between the thin glass substrate and the support substrate peels off including the water simply by immersing the substrate laminate in water, the thin glass substrate and the support are separated. The substrate can be easily separated. In addition, since the adhesive interposed between the thin glass substrate and the support substrate is water-insoluble, it does not dissolve in the water in which the substrate laminate is soaked, and the dirt derived from the adhesive is separated. It is possible to reliably prevent the situation of sticking to the surface of the thin glass substrate. Therefore, it becomes possible to ensure the cleanliness of the surface of the thin glass substrate after separation.

It is a schematic longitudinal cross-sectional view which shows the board | substrate laminated body which concerns on this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a view showing a substrate laminate according to an embodiment of the present invention. The substrate laminate 1 is obtained by laminating and integrating a thin glass substrate 2 and a support glass substrate 3 as a support substrate, and has the following configuration in detail. In other words, in the present embodiment, the substrate laminate 1 has a configuration in which the scattering prevention film 4, the thin glass substrate 2, and the transparent electrode film 5 are sequentially laminated on the surface side of the support glass substrate 3.

  Between the front surface of the supporting glass substrate 3 and the back surface of the anti-scattering film 4, there is interposed a water-insoluble resin adhesive 6 that peels off when it contains water in contact with both surfaces. The supporting glass substrate 3 and the scattering prevention film 4 are bonded to each other by the agent 6.

  Between the surface of the anti-scattering film 4 and the back surface of the thin glass substrate 2, there is interposed a water-insoluble resin adhesive 7 that is in contact with both surfaces and does not peel off with water. The anti-scattering film 4 and the thin glass substrate 2 are bonded to each other by the adhesive 7.

  The transparent electrode film 5 is directly formed on the surface of the thin glass substrate 2. The transparent electrode film 5 is formed after the thin glass substrate 2 is fixed to the support substrate 3, that is, in a state of a laminate in which the transparent electrode film 5 is removed from the substrate laminate 1 having the above-described configuration. This is performed on the surface of the thin glass substrate 2.

  Each component of the above substrate laminate 1 is subjected to a heat treatment (for example, a heat treatment at 200 ° C.) performed in a manufacturing process of a display device such as a liquid crystal display device or an organic EL display device or a lighting device such as an organic EL lighting device. It is preferable to have heat resistance that can withstand. Hereinafter, each component will be described in detail.

  As the thin glass substrate 2, a glass substrate with a plate thickness of 100 to 300 μm is used, and as the support glass substrate 3, a glass substrate with a plate thickness of 200 to 700 μm is used. As the composition of the thin glass substrate 2, for example, glass such as alkali-free glass, borosilicate glass, or soda lime glass is used, but the supporting glass substrate 3 is incorporated in a final product such as a display device or a lighting device. Therefore, it is sufficient to use the same soda-lime glass or the like as the window glass. In addition, it can replace with the glass substrate 3 and can use substrates, such as resin, metals, such as a plastics, or a ceramic, for a support substrate. The thin glass substrate 2 and the supporting glass substrate 3 may have a round shape or the like, but in the present embodiment, for example, a rectangular shape having a vertical dimension of 100 to 300 mm and a horizontal dimension of 100 to 300 mm. The same size is used.

  The adhesive 6 interposed between the supporting glass substrate 3 and the anti-scattering film 4 is an epoxy-based, acrylic-based, or silicone-based ultraviolet curable resin or heat that can be peeled off with water and has heat resistance. A curable resin can be selected. The adhesive 6 is peeled off due to the expansion in the surface direction that occurs when water is included. Specifically, as this adhesive 6, Templock (trade name) manufactured by Denki Kagaku Kogyo Co., Ltd., which is an ultraviolet curable resin, can be used. In addition, the thickness of the adhesive agent 6 is about 10-200 micrometers.

  The adhesive 7 interposed between the anti-scattering film 4 and the thin glass substrate 2 is not particularly limited as long as it does not peel off with water and is insoluble in water. An acrylic, epoxy, or silicone ultraviolet curable resin or thermosetting resin that has a high curing shrinkage and a low water absorption rate can be used. The thickness of the adhesive 7 is about 10 to 200 μm.

  As the anti-scattering film 4, it is preferable to select a material having excellent weather resistance and heat resistance such as polyethylene naphthalate resin and norbornene resin.

  And the board | substrate laminated body 1 comprised as mentioned above is immersed in water (preferably 80-90 degreeC hot water) after a series of processes are completed, and the thin glass substrate 2, the support glass substrate 3, and Are separated. More specifically, in this embodiment, the adhesive 6 that can be peeled with water is interposed between the supporting glass substrate 3 and the anti-scattering film 4 in a state where both are in contact with each other. When a predetermined time elapses in the state of being immersed in the substrate, the substrate laminate 1 is composed of the supporting glass substrate 3 and the thin glass substrate 2 having the transparent electrode film 5 formed on the front surface and the anti-scattering film 4 attached on the back surface. Separated into two. At this time, since the adhesive 6 is insoluble in water, it remains in the water while maintaining the film-like shape without dissolving in the warm water in which the substrate laminate 1 is immersed.

  Therefore, the thin glass substrate 2 and the supporting glass substrate 3 can be easily separated by simply immersing them in water, and unnecessary dirt derived from the adhesive 6 may adhere to the thin glass substrate 2 separated in water. In addition, the cleanliness of the thin glass substrate 2 after separation can be reliably ensured.

  In addition, this invention is not limited to said embodiment, It can implement with a various form. For example, in the above embodiment, the case where the anti-scattering film 4 is laminated between the supporting glass substrate 3 and the thin glass substrate 2 has been described, but the anti-scattering film 4 is omitted and water is used. The thin glass substrate 2 may be directly attached to the surface of the supporting glass substrate 3 by the peelable adhesive 6.

  In the above embodiment, the case where the adhesive 6 is interposed over the entire surface of the support glass substrate 3 has been described. However, the adhesive 6 is interposed only in the portion corresponding to the peripheral edge of the thin glass substrate 2. Or, it may be interposed in a lattice form in a region corresponding to the plate surface of the thin glass substrate 2.

  Further, in the above embodiment, the thin glass substrate 2 and the supporting glass substrate 3 are made the same size, and the case where the respective end surfaces are aligned is illustrated and described. The size of the supporting glass substrate 3 may be increased so that the supporting glass base 3 protrudes outward from the outside of the thin glass substrate 2 in plan view. As a result, when handling the laminated body 1, it is possible to work by gripping only the supporting glass substrate 3 without touching the thin glass substrate 2, so that the number of contacts with the thin glass substrate 2 is reduced as much as possible. The damage can be prevented more reliably.

DESCRIPTION OF SYMBOLS 1 Substrate laminated body 2 Thin glass substrate 3 Support glass substrate 4 Anti-scattering film 5 Transparent electrode film 6 Resin adhesive 7 Resin adhesive

Claims (7)

A substrate laminate in which a thin glass substrate and a support substrate are laminated and integrated,
A substrate laminate, wherein a water-insoluble adhesive that peels off when water is contained is interposed between the thin glass substrate and the support substrate.   The substrate laminate according to claim 1, wherein the adhesive is an adhesive resin.   The board | substrate laminated body of Claim 1 or 2 which interposed the said adhesive agent over the whole surface between the said thin glass substrate and the said support substrate.   The board | substrate laminated body of any one of Claims 1-3 by which the film for scattering prevention is affixed on the single side | surface or both surfaces of the said thin glass substrate.   The board | substrate laminated body of any one of Claims 1-3 in which the transparent electrode film is formed in the single side | surface of the said thin glass substrate.   The said thin glass substrate is a board | substrate laminated body of any one of Claims 1-3 by which the film for scattering prevention is affixed on one surface, and the transparent electrode film is formed in the other surface.   A method for separating a substrate laminate, comprising: immersing the substrate laminate according to any one of claims 1 to 6 in water to separate the thin glass substrate from the support substrate.

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