JP3122976B2 - Transparent, conductive, moisture-proof laminated sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated sheet mainly used as an article which is easily affected by static electricity, for example, a packaging bag for electronic parts such as ICs and LSIs.

[0002]

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

[0003]

Some of the articles that are susceptible to electrostatic damage are not only sensitive to static electricity but also susceptible to oxidation by moisture and oxygen, such as magnetic disks. Some packaging bags are required to have both a barrier performance against water vapor and oxygen, as well as a protection performance against static electricity damage, and a transparency capable of confirming the contents in the packaging bag.

[0004] However, the above-mentioned laminated sheet using a polyolefin-based resin film in which carbon black is embedded can not only have insufficient steam barrier properties and oxygen barrier properties but also confirm the contents in the packaging bag. Transparency cannot be obtained. Further, although the laminated sheet on which the aluminum foil is laminated has good steam barrier properties and oxygen barrier properties, it does not provide the transparency required for visually checking the contents in the packaging bag.

On the other hand, the present invention is excellent in not only the performance against electrostatic damage, the barrier property against water vapor and oxygen, but also the transparency required for visually confirming the contents in the packaging bag. To provide a laminated sheet having the following properties.

[0006]

According to the first aspect of the present invention, tin oxide, silicon oxide or aluminum oxide having a thickness of 20 to 50 mm is used.
A first base film having a vapor deposition layer of 400 ° and a second base film having an aluminum vapor deposition layer having a thickness of 20 to 400 ° were formed by tin oxide of the first base film.
Silicon oxide or aluminum oxide deposited layer surface and second
A base sheet made of a laminated sheet adhered in such a manner that the aluminum vapor-deposited layer surface of the base film is brought into contact with the base sheet, and a transparent conductive ink layer formed on one surface of the base sheet, A surface resin layer that is laminated to form a large number of dots on the surface of the transparent conductive ink layer, and a linear low-density polyethylene film layer formed on the other surface of the base sheet, A transparent / conductive / moisture-proof laminated sheet having a conductive paint layer composed of a linear pattern printing layer laminated on the linear low-density polyethylene film layer.

According to a second aspect of the present invention, in the structure of the transparent / conductive / moisture-proof laminated sheet according to the first aspect of the present invention, a large number of dots are laminated on the surface of the transparent conductive ink layer. The surface resin layer has a thickness of 1 to 100 μm, a dot width (a) of 100 to 1000 μm, an interval (b) between adjacent dots of 50 to 200 μm, and a dot width of (a) / Spacing between adjacent dots (b)
積 層 = 1 to 20.

A third aspect of the present invention is the linear low-density polyethylene film formed on the other surface of the base sheet in the structure of the transparent, conductive and moisture-proof laminated sheet according to the first or second aspect of the present invention. The layer is formed of a linear low-density polyethylene resin film having a thickness of 20 to 100 μm, and the conductive coating layer formed of a linear pattern printing layer laminated on the linear low-density polyethylene film layer is a white conductive titanate. It is composed of a laminated sheet formed of a conductive paint containing potassium whiskers.

[0009] The packaging bag using the transparent, conductive and moisture-proof laminated sheet of the present invention having the above-mentioned structure is arranged so that the surface resin layer in the laminated sheet becomes the outer surface layer of the packaging bag. Is used for the packaging bag such that the surface of the conductive paint layer composed of the linear pattern printing layer is in contact with the contents in the packaging bag.

In the transparent / conductive / moisture-proof laminated sheet of the present invention, a first base material film having a deposited layer of tin oxide, silicon oxide or aluminum oxide having a thickness of 20 to 400 ° is provided. A base sheet composed of a laminated sheet in which a second base film having an aluminum vapor-deposited layer is bonded to a second base film is, for example, a biaxially oriented polyester film, a biaxially oriented nylon film, a biaxially oriented polypropylene film or the like. A film having a thickness of about 10 to 75 μm in which a deposited layer of tin oxide, silicon oxide or aluminum oxide is formed on the film, and a biaxially oriented film such as a biaxially oriented polyester film, a biaxially oriented nylon film, and a biaxially oriented polypropylene film. And a film having a thickness of about 12 to 50 μm on which an aluminum vapor deposition layer is formed. It is obtained by, for example, adhering the vapor-deposited layers of the film to each other with a urethane adhesive.

[0011] The base sheet made of a laminated sheet of the first base film and the second base film is made of tin oxide, silicon oxide or aluminum oxide having a thickness of 20 to
The 400 ° vapor deposition layer provides good barrier properties against water vapor, oxygen and carbon dioxide. In addition, 20-40
Electromagnetic wave shielding is provided by the aluminum vapor deposition layer of 0 °. Furthermore, the biaxially stretched film in the first base material film and the second base material film provides sufficient mechanical strength such as puncture resistance required for the packaging bag.

[0012] The transparent conductive ink layer formed on one surface of the base sheet made of a laminated sheet of the first base film and the second base film is the transparent conductive ink layer of the present invention.
It prevents static electricity damage caused by external factors in a packaging bag using a conductive and moisture-proof laminated sheet. For example, it has excellent conductivity and transparency due to tin oxide, tin oxide-antimony system, potassium titanate system and the like. It is formed as a paint layer mixed with a substance having properties. The conductive ink layer has a surface resistance value of 10 ⁶ Ω / by adjusting the amount of the conductive powder in the paint for forming the conductive ink layer and the amount of the paint applied. □ It is a rough guide to form it as follows. For example, the thickness is 1 to 5 μm by a gravure coating method, a three-reverse method, or the like.
Formed to the extent.

When a surface resin layer laminated in the form of a number of dots on the surface of a transparent conductive ink layer, that is, a packaging bag made of the transparent, conductive, and moisture-proof laminated sheet of the present invention, the above-mentioned method is used. The surface resin layer serving as the outer surface layer of the packaging bag provides various properties such as abrasion resistance, gloss, and slipperiness to the laminated sheet. For example, polyurethane, vinyl chloride / vinyl acetate copolymer, polystyrene,
Thickness 1 made of thermoplastic resin such as polyamide or polyester, or curable resin such as phenol resin or epoxy resin
Formed by a number of dot groups of ~ 100μ, usually
The transparent conductive ink layer is formed by performing network coating by gravure coating on the surface.

A large number of dots forming the surface resin layer have a dot width of 100 to 1000 μ, an interval between adjacent dots of 50 to 200 μ, and
"(Dot width) / (interval between dots)"
Are formed in about 1 to 20.

If the thickness of the surface resin layer composed of a large number of dot groups, the width of a single dot, the interval between adjacent dots, and the like deviate from the above-mentioned respective rules, the presence of the surface resin layer is determined. The surface resistance of the sheet is raised, and the surface resistance of the laminated sheet cannot be maintained as substantially as the surface resistance of the conductive ink layer. The surface protection effect on the layer may be insufficient. Note that the width of each single dot constituting the surface resin layer and the interval between adjacent dots are indicated by a symbol a in each dot indicated by oblique lines in FIG. 2. The maximum width of the dot is the width of the dot (a), and the shortest distance from the edge of the dot indicated by the symbol b to the edge of the adjacent dot is the distance between adjacent dots (b) It is.

In the transparent / conductive / moisture-proof laminated sheet of the present invention, a linear low-density polyethylene film layer formed on the other surface of the base sheet, and the linear low-density polyethylene film layer are laminated on the linear low-density polyethylene film layer. The conductive paint layer composed of a linear pattern printing layer is used as the backside resin layer of the laminated sheet, and the conductive paint layer surface of the backside resin layer is used on the side in contact with the contents of the packaging bag. Is done.

The backside resin layer composed of the linear low-density polyethylene film layer and the conductive paint layer composed of a linear pattern printing layer laminated on the linear low-density polyethylene film layer is a transparent / conductive resin according to the present invention. -In a packaging bag obtained by using the moisture-proof laminated sheet, it acts to prevent static electricity damage due to friction between the contents in the packaging bag and the packaging bag, and at the same time, the transparent, conductive and moisture-proof of the present invention. The sealing portion of the packaging bag using the conductive laminated sheet has a heat-sealing property that can be formed by heat sealing with a linear low-density polyethylene film layer in a portion not laminated with the conductive paint layer. The linear low-density polyethylene film layer has a thickness sufficient to provide the heat-sealing property when forming the sealing portion and the smooth, bag-forming property of the transparent, conductive, and moisture-proof laminated sheet of the present invention, Specifically, 1
It is formed to a size of about 0 to 100 μ.

The conductive coating layer comprising a linear pattern printing layer laminated on the linear low-density polyethylene film layer is, for example, a linear coating made of a conductive coating containing white conductive potassium titanate whiskers. It is preferable to use a pattern printing layer.

[0019]

The transparent / conductive / moisture-proof laminated sheet of the present invention is arranged such that the surface resin layer side of the laminated sheet is the outer surface side of the packaging bag, that is, a conductive paint layer comprising a linear pattern printing layer. The linear low-density polyethylene film layer having the following is used such that the side thereof comes into contact with the contents in the packaging bag, and is used, for example, as a packaging material for obtaining a package of an electronic component such as an IC or LSI. .

In the transparent / conductive / moisture-proof laminated sheet of the present invention, the first base film having a vapor deposited layer of tin oxide, silicon oxide or aluminum oxide in the laminated sheet is formed of water vapor, oxygen and carbon dioxide gas. The second substrate film having an aluminum vapor-deposited layer fulfills an electromagnetic wave shielding property, and the first
The base material film and the second base material film are simultaneously
Provide the packaging material with mechanical strength such as piercing resistance required for the packaging material.

Further, the presence of the transparent conductive ink layer formed between the base material sheet and the surface resin layer laminated so as to form a large number of dots is considered to be the present invention.
Packaging bags obtained using conductive and moisture-proof laminated sheets,
It acts to prevent static electricity damage due to external factors.

Further, when a packaging bag made of the transparent, conductive and moisture-proof laminated sheet of the present invention is obtained, the surface resin layer, which is the outer surface layer of the packaging bag, has various properties such as abrasion resistance, gloss and slipperiness. Bring. In particular, since the presence of this surface resin layer causes a rise in the surface resistance value of the laminated sheet, conventionally,
Although a surface protective layer having a thickness sufficient to exert a protective action could not be formed on the surface of the conductive ink layer, the surface resin layer in the transparent, conductive, and moisture-proof laminated sheet of the present invention had a large number of dots. Since the surface protective layer is formed by the group, the thickness can be made thicker as compared with the case where the surface protective layer is formed over the entire surface of the conductive ink layer. A protective effect is achieved.

Further, the "conductive paint layer comprising a linear pattern printing layer laminated on the linear low density polyethylene film layer" formed on the other surface of the base sheet.
Has an effect of preventing static electricity damage due to friction generated between the contents in the packaging bag and the packaging bag using the transparent / conductive / moisture-proof laminated sheet of the present invention, and the other of the base sheet. Of the linear low-density polyethylene film layer formed on the surface, by the heat welding characteristics of the part not covered with the conductive paint layer consisting of the linear pattern printing layer,
The heat-sealing property is achieved such that the sealed portion of the packaging bag using the transparent, conductive and moisture-proof laminated sheet of the present invention can be formed by heat sealing.

Further, in the transparent / conductive / moisture-proof laminated sheet according to the third aspect of the present invention, the conductive paint layer comprising a linear pattern printing layer formed on the surface of the linear low-density polyethylene film has a white conductive layer. A conductive paint layer containing conductive potassium titanate whiskers, and the antistatic effect of the conductive paint layer does not decrease even in a high-temperature, high-humidity atmosphere. It exerts a function that cannot be achieved by applying an agent or filling a general-purpose antistatic agent, that is, a permanent antistatic effect that is not affected by the temperature or humidity in the atmosphere.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete constitution of the transparent, conductive and moisture-proof laminated sheet of the present invention will be described below based on production examples.

Example 1 100 parts by weight of tin oxide / antimony pigment (Mitsubishi Materials Corporation: T-1) and a vinyl chloride / vinyl acetate copolymer resin having a vinyl chloride content of 80% by weight 33 parts by weight of a mixed resin (mixing weight ratio: 1/1) with a polymethyl methacrylate resin and 1.5 parts by weight of a dispersing agent (Homogel L 1820) are dissolved in an equal amount of a mixed solvent of toluene and methyl ethyl ketone. The paint (A) for forming a transparent conductive ink layer was prepared.

Next, in FIG. 1, a transparent second base film made of a biaxially stretched polyethylene terephthalate film having a thickness of 25 μm and having an aluminum deposited layer “conductivity: 200 Ω” “Heat shielding film: Lumicool M” Type ( ^# 25) FB-50 Silver "2 of 2
The above-mentioned paint (A) is applied to the surface of the axially stretched polyethylene terephthalate film by a gravure coating method to form a transparent conductive ink layer 3 having a thickness of 3 μm. A coating agent for forming a surface resin layer having the following composition (B) is applied to the surface by a mesh coating method using a gravure coat, and has a thickness of 3 μm and a dot width (a) of 50.
0 to 600 μ, spacing between adjacent dots (b) 80
Surface resin layer 4 composed of a large number of dot groups of 100 μm
Was formed.

Coating agent (B) Cellulose acetate 1.2 parts by weight Vinyl chloride / vinyl acetate copolymer resin 10 0.0 parts by weight Urethane resin 1.4 parts by weight Polyester polyol 3.0 parts by weight Plasticizer 2.0 parts by weight wax 1.0 part by weight methyl ethyl ketone 30.3 parts by weight Toluene 21.6 parts by weight ethyl acetate ... 29.6 parts by weight

Thereafter, the first base material film 2
Of the first base material film 5 made of a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having a tin oxide vapor-deposited layer, was laminated with a urethane-based adhesive layer 6. Note that reference numeral 10
The portion indicated by is a base sheet made of the first base film 5 and the second base film 2.

Further, a 20 μm-thick polyethylene resin extrusion coat layer 7 is used on the biaxially oriented polyethylene terephthalate film surface of the first base film 5, and white conductive potassium titanate whisker is contained on the back surface. A 30 μm thick linear low-density polyethylene resin film having an electrically conductive coating layer 9 consisting of a parallel linear pattern printing layer made of a coating agent to be changed, that is, an electrostatic shielding film (Otsuka Chemical Co., Ltd .: Filstat) 8 The conductive paint layer 9 is adhered so as to be the outermost layer.
Example 1 A transparent, conductive and moisture-proof laminated sheet 1 as an example product was obtained.

EXPERIMENTS
Table 1 shows various physical properties of the conductive and moisture-proof laminated sheet. The physical properties shown in Table 1 are values measured by the following methods.

1: Surface specific resistance (Ω / □) TR8601 manufactured by Advantest 2: Half life (second) Static honest meter (S-5109 manufactured by TOA) 3: Surface layer detachment test Cellophane adhesive tape test 4: Puncture strength ( kg) Food Sanitation Law No. 20 5: Heat seal strength (kg / 15 mm width) 6: Moisture permeability (g / m ² · day) JIS Z 0208 7: Oxygen permeability (g / m ² · day · atm) 23
° C, 0% RH 8: Electrostatic shielding characteristics (V) MIL-B-1705C

[0033]

[Table 1]

"Example 2"
In the structure of the moisture-proof laminated sheet 1, instead of the first base film 5 composed of a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm having a tin oxide vapor-deposited layer,
Except for using a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm having an aluminum oxide vapor-deposited layer as a first base film, a book having a configuration corresponding to the transparent, conductive, and moisture-proof laminated sheet of Example 1 Another example of the transparent, conductive and moisture-proof laminated sheet of the invention was obtained.

[0035]

The transparent, conductive, and moisture-proof laminated sheet of the present invention is mainly used as a packaging material for a packaging bag, and prevents static electricity damage due to external factors. Prevents static electricity damage due to friction with the packaging material, and has transparency so that the contents can be visually recognized from the outside of the packaging bag. Furthermore, it has barrier properties against water vapor, oxygen, carbon dioxide gas, etc. It is excellent in mechanical performance such as surface protection and has sealing performance by heat sealing.

The transparent / conductive / moisture-proof laminated sheet of the present invention is used as a packaging bag for packaging electronic components such as ICs and LSIs which are particularly susceptible to static electricity due to these characteristics. It has extremely excellent properties in storage performance.

Further, the transparent, conductive and moisture-proof laminated sheet of the present invention has an electrostatic shielding property (MIL-B-1705).
Has a numerical value of 30 V or less, and is a packaging bag that clears the electrostatic shielding characteristics of the MIL standard, and thus has an excellent effect of utility value.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a transparent, conductive and moisture-proof laminated sheet according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a state of a dot group of a surface protective layer in the transparent, conductive, and moisture-proof laminated sheet of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transparent / conductive / moisture-proof laminated sheet 2 ... Second base film having a 20 to 400 mm thick aluminum vapor-deposited layer 3 ... Transparent conductive ink layer 4 ... Surface resin layer composed of many dot groups 5 ... First base material film having a deposited layer of 20 to 400 mm thick of tin oxide, silicon oxide or aluminum oxide 6 ... Adhesive layer 7 ... Extruded coat layer of polyethylene resin 8 ... Linear low density polyethylene film layer 9 ... Conductive paint layer consisting of a linear pattern printing layer 10 ... Base sheet

Claims (3)

(57) [Claims] 1. A film for a first substrate having a deposited layer of tin oxide, silicon oxide or aluminum oxide having a thickness of 20 to 400 °, and a second substrate having a deposited layer of aluminum having a thickness of 20 to 400 °. It is composed of a laminated sheet in which a film is adhered such that the surface of the first base material film made of tin oxide, silicon oxide or aluminum oxide comes into contact with the surface of the second base material film. A base sheet, a transparent conductive ink layer formed on one surface of the base sheet, and a surface which is laminated on the surface of the transparent conductive ink layer so as to form a number of dots. A resin layer, a linear low-density polyethylene film layer formed on the other surface of the base sheet, and a linear pattern printing layer laminated on the linear low-density polyethylene film layer. A transparent, conductive and moisture-proof laminated sheet comprising a conductive paint layer comprising 2. A surface resin layer having a large number of dots laminated on the surface of a transparent conductive ink layer having a thickness of 1 to 100 μm and a dot width (a) of 100 to 10
00μ, interval (b) between adjacent dots is 5
2. The transparent, conductive and moisture-proof according to claim 1, wherein 0 to 200 [mu] and {dot width (a) / interval between adjacent dots (b)} = 1 to 20. Laminated sheet. 3. The linear low-density polyethylene film layer formed on the other surface of the substrate sheet has a thickness of 20 to 10 mm.
0μ linear low density polyethylene resin film,
The conductive paint layer comprising a linear pattern printing layer laminated on the linear low density polyethylene film layer, wherein the conductive paint layer comprises a white conductive potassium titanate whisker. The transparent / conductive / moisture-proof laminated sheet according to claim 1 or 2.