JPH1134215A - Gas barrier transparent conductive laminated sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent electrostatic trouble and to impart barrier properties against steam and oxygen and transparency by laminating a barrier layer wherein a transparent conductive ink layer and metal oxide are respectively formed on at least one surface of base films between two transparent conductive films. SOLUTION: A gas barrier transparent conductive laminated sheet 7 is constituted by forming a transparent conductive ink layer 2 on the single surface of a first transparent base film 3 and separately forming a gas barrier layer 4 composed of metal oxide on the single surface of a second base film 5. Subsequently, the gas barrier layer 4 formed on the second base film 5 is laminated and bonded to the other surface of the first base film 3 having the transparent conductive ink layer 2 formed on the single surface thereof by using an adhesive and, further, the transparent conductive ink layer 2 and the surface of the second base film 5 are respectively opposed to transparent conductive films 1, 1' to be laminated and bonded thereto from both sides thereof by using an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly transparent laminated sheet used in a packaging bag of a substrate on which electronic components such as ICs and LSIs, and electronic components are mounted, which are easily affected by static electricity. .

[0002]

2. Description of the Related Art Packaging bags for electronic components such as ICs and LSIs and substrates on which electronic components are mounted are provided with a conductive packaging material such as a polyolefin-based resin sheet in order to prevent electrostatic damage to the electronic components in the packaging bag. A laminated sheet of a base material made of a polyolefin resin film containing carbon black, which is laminated on one or both sides of the base material, or a laminated sheet of an aluminum foil and a biaxially stretched polyester film, Alternatively, a laminated sheet of a biaxially stretched polyester film on which nickel is deposited and a polyolefin resin film is used.

[0003]

Some electronic components, such as magnetic disks, are not only sensitive to static electricity, but are also susceptible to oxidation damage by water vapor and oxygen. In addition, it is required to have both a barrier performance against water vapor and oxygen, and a transparency that allows the contents in the packaging bag to be confirmed from the outside, in addition to a performance against static electricity. However, the laminated sheet using the above-described polyolefin resin film in which carbon black is embedded has not only insufficient steam barrier properties and oxygen barrier properties, but also transparency that can confirm the contents in the packaging bag. Can not be obtained. Further, although the laminated sheet to which the aluminum foil is attached has good gas barrier properties, the contents in the packaging bag cannot be visually checked. Further, although the laminated sheet on which metal aluminum or nickel is deposited has some transparency, visual confirmation of the contents is not sufficient. On the other hand, the present invention provides a laminated sheet having not only the performance of preventing damage due to static electricity but also a barrier property against water vapor and oxygen, and a transparency necessary and sufficient for visually confirming the contents in the packaging bag. The purpose is to provide.

[0004]

As a result of intensive studies to solve the above-mentioned problems, a transparent conductive ink layer having a thickness of 0.5 to 3 μm on a transparent base film, silicon oxide or aluminum oxide, etc. It has been found that the above-mentioned object can be achieved by forming a sheet structure having a structure in which a thin layer of a gas barrier having a thickness of 5 to 500 nm is laminated between transparent conductive films. That is, the present invention provides: (1) a method in which a transparent conductive ink layer formed on at least one surface of a base film and a gas barrier layer made of a metal oxide are laminated between two transparent conductive films. Gas barrier transparent conductive laminate sheet. (2) The gas-barrier transparent conductive laminated sheet according to (1), wherein the metal oxide is at least one of silicon oxide and aluminum oxide. (3) The base film is composed of two different base films, the transparent conductive ink layer is formed on one surface of one of the two base films, and the base film is formed of two different base films. The gas-barrier transparent conductive laminated sheet according to (1) or (2), wherein the gas barrier layer is formed on one surface of the other base film. (4) The base film is composed of one base film, and the transparent conductive ink layer is formed on one surface of the one base film, and the gas barrier layer is formed on the other surface. The gas-barrier transparent conductive laminated sheet according to the above (1) or (2), characterized in that: (5) The thickness of the transparent conductive ink layer is 0.5 to 3 μm.
Wherein the gas barrier layer has a thickness of 5 to 500 nm, wherein the gas barrier transparent conductive laminate sheet according to any one of the above (1) to (4). (6) The gas barrier transparent conductive laminated sheet according to any one of (1) to (5), wherein the transparent conductive film is made of a polyethylene film.

FIG. 1 is a schematic cross-sectional view illustrating one embodiment of a gas-barrier transparent conductive laminated sheet 7 of the present invention. In FIG.
2 is a transparent conductive ink layer, 3 is a first base film,
4 is a gas barrier layer and 5 is a second base film. In order to manufacture the gas-barrier transparent conductive sheet of the present invention, first, a transparent conductive ink layer 2 is formed on one surface of a transparent first base film 3, and separately from this, a second base film is formed. 5, a gas barrier layer 4 is formed on one surface. Next, FIG. 1 shows a first base film 3 having a transparent conductive ink layer 2 formed on one surface thereof and a second base film 5 having a gas barrier layer 4 formed on one surface thereof. The layers are laminated and adhered in that order by dry lamination using a urethane-based adhesive or the like, and the surfaces of the transparent conductive ink layer 2 side and the second base film 5 side are transparent conductive films 1 and 2, respectively.
It is obtained by laminating and affixing from both sides using the same adhesive so as to face 1 ′. The transparent conductive films 1 and 1 ′ used at this time are subjected to a conductive treatment such as containing a conductive substance in a resin, and a wire containing, for example, an antistatic agent (surfactant). It is formed by attaching a commercially available transparent film having a surface resistance of 10 ⁹ Ω / □ or less, such as a low-density polyethylene. At this time, the conductive films 1 and 1 ′ have a surface resistance value in the above-described range, and if a film that is easily softened at a low temperature such as a polyethylene film is used, for example, using the obtained multilayer sheet, It is more preferable to heat seal the periphery and process it into a bag shape because the process is easy. The thickness of the transparent conductive film layers 1 and 1 ′ is approximately 10 to 50 μm from the viewpoint of workability, transparency and the like.
It is good to be about. For example, it is preferable to use a transparent conductive polyethylene film or the like.

The transparent conductive ink layer 2 has a function of preventing static electricity and shielding electromagnetic waves. For example, antimony (Sb) -doped tin oxide, tin (Sn) -doped indium oxide (ITO = Indium Tin O 2).
xide), a layer made of a conductive material having excellent conductivity such as magnesium (Mg) -doped indium oxide and also having excellent transparency.
A conductive ink is prepared by mixing and kneading the above-described conductive material in a mixture of a resin binder and a solvent, and then coating the conductive ink on one surface of the first base film 3 with, for example, a gravure coat or a bar coat. The conductive ink layer is formed by coating and drying by such a method as described above to form a conductive ink layer having a thickness of about 0.5 to 3 μm after the drying. At this time, the transparent conductive ink layer 2 is formed such that the surface resistance value of the conductive ink layer becomes 10 ⁶ Ω / □ or less by adjusting the amount of the conductive powder in the conductive ink, the resin binder, the solvent, and the like. Preferably.

The gas barrier layer 4 formed on one surface of the second base film 5 is formed by depositing a metal oxide having conductivity and being a barrier layer against gas on the base film. Formed by At this time, the metal oxide used as the gas barrier layer 4 is at least one of silicon oxide and aluminum oxide.
More preferably, one is used. The thickness of the gas barrier layer formed by vapor deposition of a metal oxide is approximately 5 to 500 nm.
If it is present, it is sufficient to obtain good barrier properties against water vapor and oxygen, and the transparency is more preferably not impaired so much.

As the first base film 3 and the second base film 5, a transparent biaxially stretched film such as a biaxially stretched nylon film or a biaxially stretched polyester film is used. The first base film 3 and the second base film 5 used at this time are transparent films having a thickness of about 10 to 100 μm and about 4 to 50 μm, respectively.

Thus, the transparent conductive films 1, 1 '
In addition to the transparent conductive ink layer 2 and the gas barrier layer 4 between the first base film 3 and the second base film 5
With the presence of the transparent conductive film layers 1 and 1 ′, sufficient mechanical strength such as puncture resistance is provided, and electrostatic interference due to frictional contact with the sheet is prevented. Action is given.

At this time, the gas barrier layer 4, the first base film 3 and the transparent conductive ink layer 2 are sequentially laminated on the surface of the second base film 5 in this order, and the transparent conductive film 1, 1 'may be sandwiched and each may be adhered. The characteristics of the obtained gas-barrier transparent conductive laminated sheet are, in short, the components of the finally obtained gas-barrier transparent conductive laminated sheet. It is needless to say that if the structure laminated in the order shown in FIG. 1 is adopted, it is not affected by the manufacturing order of the manufacturing process.

FIG. 2 is a schematic cross-sectional view illustrating another embodiment of the gas-barrier transparent conductive laminated sheet 7 of the present invention.
In this example, for example, the transparent conductive ink layer 2 is formed on one surface of the base film 3 in the same manner as in the case of FIG.
On the other hand, a gas barrier layer 4 is also formed on one side of the base film 5 in the same manner as in FIG. 1, and the base film 3 and the base film 5 are formed so that the transparent conductive ink layer 2 and the gas barrier layer 4 face each other. Are laminated and adhered, and both surfaces thereof (the transparent conductive ink layer 2 and the gas barrier layer 4).
Is obtained by attaching the transparent conductive film layers 1 and 1 ′ to the surface on which is not formed).

FIG. 3 is a schematic sectional view illustrating still another embodiment of the gas barrier transparent conductive laminated sheet 7 of the present invention. In this embodiment, for example, the gas barrier transparent conductive laminate sheet shown in FIG. As in the case of the laminated sheet 7, the transparent conductive ink layer 2 is formed on one surface of the base film 3 in the same manner as in the case of FIG. 1, while on the other side of the base film 5, the same as in the case of FIG. The gas barrier layer 4 is formed, and the base film 3 and the base film 5 are respectively separated from the transparent conductive ink layer 2 in a manner opposite to the case of FIG.
And the surfaces on which the gas barrier layer 4 is not formed face each other and are adhered with an adhesive, and both surfaces thereof (the surface on which the transparent conductive ink layer 2 and the gas barrier layer 4 are formed) ) Is obtained by sticking the transparent conductive film layers 1 and 1 ′.

FIG. 4 is a schematic sectional view illustrating still another embodiment of the gas-barrier transparent conductive laminated sheet 7 of the present invention. In this embodiment, the base film 3 is formed in the same manner as in FIG. A transparent conductive ink layer 2 on one surface of
Further, the gas barrier layer 4 is formed on the other surface, and the transparent conductive film layers 1 and 1 'are formed on both surfaces (the surface on which the transparent conductive ink layer 2 and the gas barrier layer 4 are formed). Obtained by sticking.

Each of the constituent members of the gas barrier transparent conductive laminated sheet 7 of the present invention illustrated in FIGS.
It has a structure in which the transparent conductive film layers 1 and 1 ', the transparent conductive ink layer 2, the first base film 3, the gas barrier layer 4, and the second base film 5 are respectively laminated in the illustrated order. The properties of the obtained gas-barrier transparent conductive laminated sheet 7 are not affected by the order of the production steps in the production process, as in the case of the gas-barrier transparent conductive laminated sheet 7 illustrated in FIG. The same is true.

Although not shown, in the gas barrier transparent conductive laminated sheet 7 of the present invention, both surfaces of the first base film 3 laminated between the transparent conductive film layers 1 and 1 'or The transparent conductive ink layer 2 and the gas barrier layer 4 formed on one side of each of the first base film 3 and the second base film 5 are not necessarily one pair as illustrated in FIGS. There is no necessity, and a plurality of pairs of the transparent conductive ink layer 2 and the gas barrier layer 4 are laminated, and when they are sandwiched between the transparent conductive film layers 1 and 1 ', they are laminated. May be.

The gas-barrier transparent conductive laminated sheet 7 of the present invention is used, for example, as a packaging material for obtaining a packaging bag for electronic components such as ICs and LSIs. For example, when a packaging bag is manufactured using the gas-barrier transparent conductive laminated sheet 7 of the present invention, the transparent conductive films 1 and 1 ′ on the surface prevent static electricity damage due to factors from the outside of the bag, and , And shields electromagnetic waves,
The effect of preventing static electricity damage due to contact friction between the contents in the packaging bag and the inner surface of the packaging bag is obtained.
Since it can be melted at a relatively low temperature, there is an advantage that the sealing portion can be easily welded and sealed by heat sealing or the like, which facilitates processing. In addition, since the gas barrier layer 4 is formed of a deposited layer of silicon oxide or aluminum oxide, the gas barrier layer 4 has a good barrier property against water vapor and oxygen. Strengthens mechanical strength such as piercing resistance.

[0017]

In the gas-permeable transparent conductive laminated sheet of the present invention, the first base film on which the transparent conductive ink layer is formed prevents static electricity damage due to external factors and also performs electromagnetic wave shielding properties, and is formed of silicon oxide or silicon oxide. The second base film having a gas barrier layer composed of a vapor-deposited layer of aluminum oxide has a good barrier property against water vapor and oxygen, and the first base film and the second base film are simultaneously formed. Provide the packaging material with mechanical strength such as piercing resistance required for the packaging material. Further, in the packaging bag obtained by using the gas-barrier transparent conductive laminated sheet of the present invention, the transparent conductive films 1 and 1 ′ formed on the surface of the base film are combined with the contents in the packaging bag and the packaging bag. It has the effect of preventing static electricity damage due to contact friction between it and the heat-sealing property such that the sealing portion of a packaging bag using the gas-barrier transparent conductive laminated sheet of the present invention can be formed by heat sealing. Will be fulfilled.

[0018]

EXAMPLES The specific structure of the gas-barrier transparent conductive laminated sheet of the present invention will be described below based on examples.

Example 1 First, polyester resin 2
0 parts by weight were dissolved in 200 parts by weight of a mixed solvent of toluene and cyclohexanone (mixing weight ratio 1: 1).
100 parts by weight of the TO fine powder and 3 parts by weight of a dispersant (nonionic surfactant) were added and dispersed well to prepare a transparent conductive ink. Next, the previously prepared transparent conductive ink was applied to one surface of the biaxially stretched polyethylene terephthalate film 3 having a thickness of 25 μm by a gravure coat (solid surface) method, and a transparent conductive ink layer 2 having a thickness of 1.2 μm was formed.
(Surface resistance 3 × 10 ⁴ Ω / □). Then
This biaxially stretched polyethylene terephthalate film 3
A 12 μm-thick biaxially stretched polyethylene terephthalate film 5 (Mitsubishi Chemical Co., Ltd.) having a transparent vapor-deposited layer (gas barrier layer) 4 of silicon oxide on one side on the side where the transparent conductive ink layer 2 is not formed. (Co., Ltd .: Tech Barrier H) The above-mentioned transparent vapor-deposited surface (gas barrier layer) 4 of silicon oxide was laminated and attached with a urethane-based adhesive to obtain a laminated intermediate. A transparent conductive polyethylene resin film containing a surfactant having a thickness of 30 μm on both surfaces of the thus obtained laminated intermediate “Ohjin Co., Ltd .: High Shield T; 1 ′ was laminated and attached with a urethane-based adhesive to obtain a gas-barrier transparent conductive laminated sheet 7 of the present invention.

Example 2 Instead of the biaxially stretched polyethylene terephthalate film 5 (Mitsubishi Chemical Corporation: Tech Barrier H) having a thickness of 12 μm and having a transparent vapor-deposited layer of silicon oxide in Example 1, 2 having a thickness of 12 μm having an aluminum oxide deposition layer (gas barrier layer) 4
A gas barrier transparent conductive laminated sheet 7 of the present invention was obtained in the same manner as in Example 1 except that an axially stretched polyethylene terephthalate film 5 (Toyo Metallizing Co., Ltd .: VM / PET1011) was used.

The physical properties of the gas-barrier transparent conductive laminated sheets obtained in Examples 1 and 2 are shown in Table 1.
The physical properties shown in Table 1 are values measured by the following methods. 1. 1. Light transmittance (total visible light transmittance) A self-recording spectrophotometer (U-4000; Hitachi, Ltd.) is used. 2. Haze (cloudiness) Haze meter (HGM-3D; manufactured by Suga Test Instruments) is used. ^3. Moisture permeability (g / m ² · atm) Value at room temperature 40 ° C and humidity 90% 4. Oxygen permeability (cc / m2 · 24 hr · atm) Value at room temperature 25 ° C. and humidity 90% Surface resistance value Measured by four probe method (Loresta AP; manufactured by Mitsubishi Chemical Corporation)

[0022]

[Table 1]

[0023]

The gas barrier transparent conductive laminated sheet of the present invention has a large effect of suppressing the generation of static electricity due to friction.
It has features such as good gas barrier properties against water vapor and oxygen, high transparency, and low softening temperature.Especially, when used as a packaging material such as a packaging bag in the field of electronic materials, electrostatic damage due to external factors. In addition to preventing static electricity damage caused by friction between the contents and the packaging material, and because the transparency is relatively high, the contents can be easily identified from the outside of the packaging bag. It also has advantages such as easy gas barrier properties against water vapor and oxygen and easy workability by heat sealing.

[Brief description of the drawings]

FIG. 1

FIG. 4 is a cross-sectional view schematically showing one embodiment of the gas-barrier transparent conductive laminated sheet of the present invention.

[Explanation of symbols]

 1, 1 '... transparent conductive film 2 ... transparent conductive ink layer 3 ... first base film 4 ... gas barrier layer 5 ... ... Second base film

Claims (6)

[Claims] 1. A gas barrier formed by laminating a transparent conductive ink layer formed on at least one surface of a base film and a gas barrier layer made of a metal oxide between two transparent conductive films. Transparent conductive laminated sheet. 2. The gas-barrier transparent conductive laminated sheet according to claim 1, wherein the metal oxide is at least one of silicon oxide and aluminum oxide. 3. The base film comprises two different base films, wherein the transparent conductive ink layer is provided on one surface of one of the two base films, and The gas-barrier transparent conductive laminated sheet according to claim 1, wherein the gas barrier layer is formed on one surface of the other base film of the film. 4. The base film comprises one base film, the transparent conductive ink layer is formed on one surface of the one base film, and the gas barrier layer is formed on the other surface. The gas-barrier transparent conductive laminated sheet according to claim 1 or 2, wherein 5. The transparent conductive ink layer has a thickness of 0.5 to 0.5.
3 μm, and the thickness of the gas barrier layer is 5 to 500 μm.
5. The gas-barrier transparent conductive laminated sheet according to claim 1, wherein 6. The gas-barrier transparent conductive laminated sheet according to claim 1, wherein the transparent conductive film comprises a polyethylene film.