JP2000119048A - Glass laminate and front surface plate of plasma display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass laminate hardly generating a scorch, even when used as the front surface filter of a plasma display under an environment comprising a high temperature and a high humidity. SOLUTION: This glass laminate is produced by disposing the melted tin- contacted bottom surfaces 1a, 2a of two float glass plates mutually on the outsides and disposing the melted tin-noncontacted top surfaces 1b, 2b (non-tin surfaces) on the insides so that the top surfaces are not faced to each other. The bottom surfaces containing tin have higher durability against high temperature and high humidity than that of the top surfaces, and scarcely generates a scorch. When the glass laminate is used as the front surface plate of a plasma display, the deterioration of the front surface plate is reduced. Desirably, a glass laminate nipping a metal mesh having an electromagnetic wave-shielding property between the glass plates of the glass laminates is used as the front surface plate of the plasma display.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated glass body which can be used in places exposed to high temperature and high humidity, and more particularly to a laminated glass body used for a front panel for protecting a plasma display and shielding electromagnetic waves.

[0002]

2. Description of the Related Art A front plate provided with a metal mesh layer is used for protecting a plasma display and shielding electromagnetic waves. There are few examples in which a laminated glass plate is used as the front plate. In some cases, single-pane glass is used, but in this case, AR (anti-reflection) and A
A film having a G (anti-glare) function is stuck. Even when a laminated glass is used as the front plate, both surfaces are coated with a film having AR and AG functions or a coating by vapor deposition or sputtering.

[0003]

When a laminated glass plate is used as a front plate of a plasma display, and a film having an AR and AG function is not bonded to at least one surface, or the AR and AG functions are formed by vapor deposition or the like. When the laminated glass plate is used in a high-temperature and high-humidity environment when the film having no film is coated, interference color (iris) or cloudiness (such as NaOH, Na2CO3, and NaHCO3 in glass components) Ingredients react with oxygen in the air). For example, if it is kept at 60 ° C. and a relative humidity of 90% for 500 hours, sodium (Na) in the glass plate precipitates on the glass surface and causes burnt of the glass plate.

In addition, since it is difficult to form a low-resistance conductive layer with single-pane glass, it is difficult to provide high electromagnetic shielding performance without lowering transmittance.

An object of the present invention is to provide a laminated glass which is less likely to cause burns in a high temperature and high humidity environment as a front filter of a plasma display.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to dispose a bottom surface which is in contact with molten tin during the production of float glass and a top surface which is not in contact with the molten tin during the production of float glass (non-tin). This problem is solved by a laminated glass body in which the surfaces (sides) are arranged inside facing each other or at least the top surface (non-tin surface) of the glass is arranged inside.

In order to manufacture a glass plate by the float method, a molten glass is flowed over the surface of molten tin to form a flat glass plate. Since the glass surface on the side of the glass plate thus contacted with the molten tin has a tin-containing layer, it is called the bottom surface to distinguish it from the glass surface on the opposite side, and the side of the glass plate not in contact with the tin The glass surface is sometimes called the top surface to distinguish it from the bottom surface. The present inventors have completed the present invention by finding that the bottom surface containing tin has higher durability against high temperature and humidity than the top surface and is less likely to cause burns.

[0008] A plasma display using the laminated glass body as a front plate of the plasma display is about 80.
Since it is used at a temperature of ℃, the tin-containing surface of the laminated glass is used as the front plate with the outer side, so even if it is placed on the front side of the plasma display in a high temperature and high humidity state, there is a loss of light transmittance. It is difficult to reduce cloudiness because the diffusion rate of sodium (Na), which causes cloudiness, is 1/1/1 at the bottom surface of the glass plate under high temperature and high humidity.
This is because it is 10.

In order to use the laminated glass body as a front plate of a plasma display, it is desirable to use a laminated glass body with a metal mesh having an electromagnetic wave shielding property interposed between the glass plates.

The laminated glass body of the present invention can be used in a place exposed to high temperature and high humidity, in addition to a front plate of a plasma display.
For example, viewing windows for food heating equipment, glass doors for bathrooms, etc.
It can be used as a glass window or the like. Applications where weather resistance is required, using a laminated glass in which two glass plates are closely placed and the bottom surface is placed on the outside and, in some cases, a laminated glass in which an air layer is provided between the two glass plates,
For example, it can be used for a window glass of an automobile, a glass window of a building, and the like.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A laminated glass body according to an embodiment of the present invention will be described with reference to the drawings, taking a front plate of a plasma display as an example. FIG. 1 is a cross-sectional view of the front panel of the plasma display. The present invention is characterized in that a laminated glass body in which a top surface (non-tin surface) of a glass plate manufactured by a float method is arranged inside and bonded to each other is used as a front plate of a plasma display. As shown in FIG. 1, the top surface 1b of at least one of the glass plates 1 and 2,
A front plate made of a laminated glass body with 2b inside is used.

The manufacturing process of the plasma display panel front panel according to the present embodiment will be described first with reference to FIGS.
A description will be given based on FIG.

After drying the metal foil 3 having a thickness of about 5 to 50 μm, a PVB (polyvinyl butyral) film 4 a having a thickness of about 10 to 100 μm and a polyester resin film 4 having a thickness of about 50 to 100 μm are arranged in this order in FIG. Laminate and bond as shown in (a).

At this time, the metal foil 3 is preferably a metal foil 3 having a small electric resistance, such as aluminum, silver, nickel,
Chromium, stainless steel, etc. can be used, but copper foil is the best conductive material. It is desirable to use a copper foil which has been subjected to a blackening treatment in order to impart corrosion resistance.

The PVB 4a is used as an adhesive component between the polyester resin film 5 and the metal foil 3.
Instead of the B polymer, its precursor monomer may be applied. PVB 4a is used to fix metal foil 3 on polyester resin film 5, but in the present invention, PVB 4a is used.
Since the polymer is also used as an intermediate film of a laminated glass body as described later, the two PVBs naturally have high affinity.

The polyester resin film 5 has a function as a carrier for patterning and etching the metal foil 3, but instead of the polyester resin film, the carrier film may be made of triacetyl chloride (TAC), polyethylene (PE), Polypropylene (PP), polyvinyl chloride (PVC), or the like can be used.

The three films 3 and 4 shown in FIG.
a and 5 are laminated and adhered to obtain a laminated film of FIG. At this time, each layer is bonded by heating to about 130 to 180 ° C. The adhesive strength between the polyester resin film 5 and the PVA film 4a is set high enough not to cause a problem such as peeling off in the etching step, and weak enough to be easily peeled off after the etching. Adjustment of the adhesive force between the polyester resin film 5 and the intermediate film PVB4a can be adjusted by the degree of surface roughening of the polyester resin film 5.

Next, the metal foil 3 is etched by a known photolithography method to obtain a laminated film having a metal mesh 3a shown in FIG. 4 (c). The laminated film having the obtained metal mesh 3a, the glass plate 1 having the bottom surface 1a on the outside and the top surface 1b on the PVB 4b side and P
VB4b (thickness: about 0.2 to 0.8 mm) is arranged as shown in FIG. 4D, and the roller is set at about 90 to 120 ° C. so that the metal mesh 3a surface, the glass plate 1 and the PVB4b surface are in contact with each other. Adhere by crimping.

Thus, the metal mesh 3a side and the intermediate film
(PVB) Unnecessary after performing temporary bonding so that 4b contacts
Peeling off the soft polyester resin film 5 (FIG. 5)
(A)). At this time, the metal mesh 3a is an intermediate film (PV
B) Damaged during handling due to strong adhesion to 4b
I will not do it. Then, the peeled PVB film 4a
The third intermediate film (PVB) 4c (thickness of about 0.2 to
0.8mm) with the bottom surface 2a outside and the top
The second glass plate 2 with the surface 2b facing the PVB 4c is placed
Then, at about 130 to 160 ° C. for 10 to 2
0-10 minutes, 8-10 kg / cm ^TwoAttach with pressure.

Here, the reason why the third intermediate film (PVB) 4c is arranged is that an extremely thin intermediate film (PVB) is formed in the step of FIG.
B) This is to prevent air bubbles from entering between the 4a and the second glass plate 2. Thus, the manufacturing process of the normal laminated glass body is completed. As a result, FIG.
A laminated glass body for a plasma display in which a metal mesh 3a is sandwiched between (PVB) 4 (obtained by integrating PVBs 4a to 4c) in an intermediate film shown in FIG.

The thickness of the glass plate 1 is 1.8 mm, and the thickness of the intermediate layer (polyvinyl butyral resin) 4 is 0.38 m.
m, the metal mesh 3a is formed using METAX 473B (manufactured by Daiwabo Co., Ltd.), the thickness of the intermediate layer (polyvinyl butyral resin) 4 is 0.38 mm, and the thickness of the glass plate 2 is 1.8 mm. Then, when the top surfaces 1b and 2b of the laminated glass shown in FIG. 1 are directed inward (Example 1), the top surface 1b and the bottom surface 2a shown in FIG.
The front plates for electromagnetic shielding were respectively prepared at a temperature of 60 ° C. and 90 ° C. assuming that the surface was directed inward (Example 2) and the case where the bottom surfaces 1 a and 2 a shown in FIG.
Table 1 shows the state of the front plate surface after the treatment at 0% to 500 hours at% relative humidity and the results of tests for changes in transmittance.

[Table 1] ================================ Example 1 Example 2 Comparative Example 1 (Face matching) (Top-photo matching) (Photo matching) Processing time------------------------------------------------------ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 0 1.7 60 1.7 60 1.7 60 60 100 1.7 60 5 60 10 59 300 1.7 60 10 59 22 22 58 500 1.7 60 12 59 29 56 =================================== === H: haze (%) T: transmittance (%)

Here, the haze ratio is an index indicating the degree to which light incident from a direction perpendicular to the glass surface is transmitted through the glass plate and then diffused in a direction other than the direction in which the light travels straight. When the light intensity is T (measured using an integrating sphere), the haze ratio is expressed as: haze ratio (%) = (T−Tp) / T.

According to the results shown in Table 1, the laminated glass in which the top surfaces 1b and 2b of the glass plates 1 and 2 of the first embodiment are both inner surfaces does not change in both the surface and the transmittance, but the top of the glass plate 1 of the second embodiment. The laminated glass having only the surface 1b as the outer surface has a burn that can be seen at a glance on the surface, and the transmittance is 1%.
Dropped. However, in the laminated glass body in which the bottom surface 1a of each of the glass plates 1 and 2 of Comparative Example 1 was an outer surface, the haze ratio was greatly reduced, and burns occurred.

Table 2 shows the results of a visual test on image clarity and appearance when the front plate after the above-described test is arranged on the front surface of the plasma display.

[Table 2] ============================== Example 1 Example 2 Comparative Example ------ −−−−−−−−−−−−−−−−−−−− (Top face matching) (Top-photo face matching) (Photo face matching) (Place the photo face outside) −−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− =======================

As described above, the front plate using the laminated glass having the top surfaces 1b and 2b of the glass plates 1 and 2 of the first embodiment as the inner surfaces has no problem in the clarity and appearance of the image. The laminated glasses 1 and 2 having only the top surface 1b of the glass plate 1 as the outer surface had a problem in image clarity to some extent. In this case, the laminated glass 1 placed outside
The above problem is improved by attaching an AR (anti-reflection) film to the surface of the top surface 1b. However, the front plate of Comparative Example 1 was inferior in both image clarity and appearance.

[0028]

According to the present invention, when a laminated glass body in which a metal mesh or the like is sandwiched is used for the front panel of a plasma display, light transmittance is lost when used for a long time in a high temperature and high humidity environment. The turbidity phenomenon does not easily occur.

[Brief description of the drawings]

FIG. 1 is a sectional view of a front plate of a plasma display according to an embodiment of the present invention.

FIG. 2 is a sectional view of a front plate of the plasma display according to the embodiment of the present invention.

FIG. 3 is a sectional view of a front plate of a plasma display of a comparative example.

FIG. 4 is a diagram illustrating a manufacturing process of the front panel of the plasma display according to the embodiment of the present invention.

FIG. 5 is a diagram showing a manufacturing process of the front panel of the plasma display according to the embodiment of the present invention.

[Explanation of symbols]

 1a, 2a Glass plate bottom surface 1b, 2b Glass plate top surface 1, 2 Glass plate 3a Metal mesh 4 Intermediate film (PVB)

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 20, 1999 (1999.10.
20)

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

When a laminated glass plate is used as a front plate of a plasma display, a film having AR and AG functions is not bonded to at least one surface, or AR and AG functions are formed by vapor deposition or the like. When the laminated glass plate is used in a high-temperature and high-humidity environment without coating a film having the same, an interference color (iris) or cloudiness (NaOH, Na 2 CO 3 , Components such as NaHCO 3 react with oxygen in the air).
For example, if it is kept at 60 ° C and 90% relative humidity for 500 hours,
Sodium (Na) in the glass plate precipitates on the glass surface, causing burns on the glass plate.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008] A plasma display using the laminated glass body as a front plate of the plasma display is about 80.
Since it is used at a temperature of ℃, the tin-containing surface of the laminated glass is used as the front plate with the outer side, so even if it is placed on the front side of the plasma display in a high temperature and high humidity state, there is a loss of light transmittance. Less cloudiness is less likely to occur . This is because the diffusion rate of sodium (Na), which causes white turbidity, is 1/1/1 at the bottom surface of the glass plate under high temperature and high humidity.
This is because it is 10.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013] thickness of about 5~50μm of the dried metal foil 3 <br/> a thickness of about 10 to 100 [mu] m PVB (polyvinyl butyral) film 4a and a thickness of about 50~100μm a polyester resin film 5 This As shown in FIG. 4A, the layers are laminated and bonded in this order.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

Here, the reason why the third intermediate film (PVB) 4c is arranged is that an extremely thin intermediate film (PVB) is formed in the step of FIG.
B) This is to prevent air bubbles from entering between the 4a and the second glass plate 2. Thus, the manufacturing process of the normal laminated glass body is completed. As a result, FIG.
A laminated glass body for a plasma display in which a metal mesh 3a is sandwiched between intermediate films ( PVB) 4 (obtained by integrating PVBs 4a to 4c) can be obtained.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

[Table 1] ================================ Example 1 Example 2 Comparative Example 1 (Top face matching) (Top-photo face matching) (Photo face matching) Processing time ------------------------------------------------------------------------------------------------------------------------------------------------ T −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 0 1.760 1.7 60 60 1.7 60 100 1. 7 60 5 60 10 59 300 300 1.7 60 10 59 22 58 500 1.7 60 60 12 59 29 56 ============================ ======= H: haze (%) T: transmittance (%)

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

[Table 2] ================================= Example 1 Example 2 Comparative Example 1- −−−−−−−−−−−−−−−−−−−−−−−−−− (Top face matching) (Top-photo face matching) (Photo face matching) (Pattern face placed outside) − −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− =============================== ────────────────── ───────────────────────────────────

[Procedure amendment]

[Submission date] October 21, 1999 (1999.10.
21)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

When a laminated glass plate is used as a front plate of a plasma display, and a film having an AR and AG function is not bonded to at least one surface, or the AR and AG functions are formed by vapor deposition or the like. When the laminated glass plate is used in a high-temperature and high-humidity environment without coating a film having the same, an interference color (iris) or cloudiness (NaOH, Na ₂ CO ₃ , Components such as NaHCO ₃ react with oxygen in the air).
For example, if it is kept at 60 ° C and 90% relative humidity for 500 hours,
Sodium (Na) in the glass plate precipitates on the glass surface, causing burns on the glass plate.

Claims (2)

[Claims] 1. The method according to claim 1, wherein the bottom surfaces contacting the molten tin during the production of the float glass are arranged outside each other, and the top surfaces not contacting the molten tin during the production of the float glass are arranged inside so as to face each other, or at least. A laminated glass body, wherein a top surface of one glass is disposed inside. 2. A front plate of a plasma display, wherein the laminated glass body according to claim 1 is used as a front plate of a plasma display.