JP3122975B2 - 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 static electricity damage are not only sensitive to static electricity, such as magnetic disks, but also susceptible to oxidation damage by moisture and oxygen. Some packaging bags are required to have both a barrier performance against water vapor and oxygen, as well as a barrier performance against water vapor and oxygen, and a transparency that allows the contents in the packaging bag to be confirmed.

[0004] However, the above-mentioned laminated sheet using a polyolefin resin film containing carbon black not only has insufficient steam barrier properties and oxygen barrier properties, but also confirms the contents in the packaging bag. The obtained 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.

[0005] On the other hand, the present invention has an electrostatic shielding property that clears the MIL standard (B-1705) with respect to the performance against electrostatic damage, and furthermore, it has a water vapor,
Provided is a laminated sheet having excellent barrier properties against oxygen, carbon dioxide gas, and the like, and also excellent transparency required for visually confirming the contents in a packaging bag.

[0006]

According to the first aspect of the present invention, one surface is coated with a deposited layer of tin oxide, aluminum oxide or silicon oxide, and the other surface is coated with an aluminum deposited layer having a thickness of 20 to 400 °. A base sheet made of a plastic film, and an antistatic treated polyester laminated on one surface of the base sheet;
It is composed of a transparent, conductive and moisture-proof laminated sheet having a polypropylene or polystyrene film layer and a polyethylene film layer containing an antistatic agent laminated on the other surface of the base sheet.

According to a second aspect of the present invention, there is provided a first base film made of a plastic film having a deposited layer of tin oxide, aluminum oxide or silicon oxide, and a deposited aluminum layer having a thickness of 20 to 400 °. The base sheet is formed by a laminated sheet in which the second base film made of a plastic film is bonded so as to be in contact with the aluminum vapor-deposited layer surface, and one surface of the base sheet is antistatic. Has been subjected to processing, and
The other surface of the base sheet is a transparent, conductive and moisture-proof laminated sheet in which a polyethylene film layer containing an antistatic agent is laminated.

[0008] The invention according to claim 3 is a first base material film in which another plastic film is adhered to the surface of a plastic film having a vapor deposited layer of tin oxide, aluminum oxide, or silicon oxide. 20-400Å
A base sheet is formed by a laminated sheet in which another plastic film is adhered to a surface of a plastic film having a vapor-deposited aluminum layer and a second base film formed by attaching another plastic film to the base film. A transparent / conductive / moisture-proof laminated sheet in which one surface of the substrate is subjected to an antistatic treatment, and a polyethylene film layer containing an antistatic agent is laminated on the other surface of the base sheet. Consists of

According to a fourth aspect of the present invention, tin oxide,
Aluminum oxide or silicon oxide deposited layer and thickness 20
A base sheet made of a plastic film on which an aluminum vapor deposition layer having a thickness of about 400 ° is superimposed, and an antistatic treated polyester, polypropylene or polystyrene film laminated on the vapor deposition layer surface of the base sheet A transparent, conductive and moisture-proof laminated sheet having a layer and a polyethylene film layer containing an antistatic agent laminated on the non-deposited layer surface of the substrate sheet.

In the packaging bag using the transparent / conductive / moisture-proof laminated sheet of the present invention having the above constitution, the polyethylene film layer containing the antistatic agent in the laminated sheet has an inner surface layer of the packaging bag. The bag is made in contact with the contents in the bag.

In the transparent, conductive and moisture-proof laminated sheet according to the first aspect of the present invention, one surface is coated with a deposited layer of tin oxide, aluminum oxide or silicon oxide, and the other surface is deposited with a thickness of 20 to 400 ° aluminum. A base sheet made of a plastic film covered with a layer,
A plastic film having a deposited layer of tin oxide, aluminum oxide or silicon oxide and a plastic film having an aluminum deposited layer having a thickness of 20 to 400 °, according to the transparent / conductive / moistureproof laminated sheet of the invention according to claim 2 or 3, In the transparent / conductive / moisture-proof laminated sheet according to the fourth aspect of the present invention, a deposited layer of tin oxide, aluminum oxide or silicon oxide and an aluminum deposited layer having a thickness of 20 to 400 ° are formed so as to overlap on one surface. Examples of the plastic film include a biaxially stretched polyester film, a biaxially stretched nylon film, a biaxially stretched polypropylene film, and other biaxially stretched films or a polystyrene film having a predetermined vapor-deposited layer and a thickness of about 10 to 75 μm. Is used.

The transparent, conductive and moisture-proof laminated sheet according to the second aspect of the present invention comprises a plastic film having a deposited layer of tin oxide, aluminum oxide or silicon oxide, and a plastic film having an aluminum deposited layer having a thickness of 20 to 400 °. The base sheet composed of the laminated sheet is obtained by, for example, attaching the surfaces of the vapor-deposited layers of the vapor-deposited films with a urethane-based adhesive.

[0013] In the transparent, conductive and moisture-proof laminated sheet according to the third aspect of the present invention, a plastic film having a deposited layer of tin oxide, aluminum oxide or silicon oxide is bonded to another plastic film, and has a thickness of 20 to 400.
Adhesion between the plastic film having the aluminum vapor-deposited layer and another plastic film is obtained by, for example, attaching the two with a urethane-based adhesive. In addition, in another plastic film laminated on the vapor deposition layer surface, for example,
A biaxially stretched film such as a biaxially stretched polyester film, a biaxially stretched nylon film, and a biaxially stretched polypropylene film, or a polystyrene film is used.

In the transparent / conductive / moisture-proof laminated sheet according to the fourth aspect of the present invention, any one of the deposited layer of tin oxide, aluminum oxide or silicon oxide and the deposited layer of aluminum having a thickness of 20 to 400 ° is formed on the outer surface. It may be.

In each substrate sheet, tin oxide (SnO)
_x ), aluminum oxide (AlO _x ) or silicon oxide (SiO _x ) is formed to a thickness of about 20 to 400 °, has good barrier properties against water vapor, oxygen and carbon dioxide, and is transparent. It has the nature. Also,
Electromagnetic wave shielding and transparency are maintained by the aluminum deposition layer having a thickness of 20 to 400 °.
Furthermore, the biaxially stretched film in each base sheet provides sufficient mechanical strength such as puncture resistance required for the packaging bag.

In the transparent / conductive / moisture proof laminated sheet according to the second and third aspects of the present invention, the antistatic treatment on one surface of the laminated sheet may be performed by using a separate plastic film which has been subjected to the antistatic treatment. For example, a biaxially stretched film such as a biaxially stretched polyester film, a biaxially stretched nylon film, a biaxially stretched polypropylene film, or a polystyrene film which has been subjected to an antistatic treatment may be laminated.

In the transparent / conductive / moisture-proof laminated sheet according to the present invention, the polyethylene film layer containing an antistatic agent laminated on the other surface of the base sheet is the transparent / conductive / moisture-proof laminated sheet. In the packaging bag obtained by using the method, the function of preventing electrostatic damage due to friction between the contents in the packaging bag and the packaging bag is achieved. At the same time, the sealing portion of the packaging bag using the transparent / conductive / moisture-proof laminated sheet of the present invention has such a heat-sealing property as can be formed by heat sealing with a polyethylene resin layer containing the antistatic agent. From these relationships, the polyethylene film layer containing the antistatic agent is transparent, conductive and conductive according to the present invention.
It is formed to a thickness sufficient to provide smooth bag making characteristics with the moisture-proof laminated sheet, specifically, about 10 to 100 μm.

[0018]

The transparent, conductive and moisture-proof laminated sheet of the present invention is characterized in that a polyethylene film layer containing an antistatic agent laminated on the other surface of the base sheet in the laminated sheet is formed on the inner surface side of the packaging bag. It is used as it is, that is, it is used so as to be in contact with the contents in the packaging bag, and is used, for example, as a packaging material for obtaining a packaging bag for electronic components such as ICs and LSIs.

In the transparent / conductive / moisture-proof laminated sheet of the present invention, the deposited layer of tin oxide, aluminum oxide or silicon oxide in the laminated sheet provides a barrier property against water vapor, oxygen, carbon dioxide gas, etc. The deposited layer provides electromagnetic wave shielding. Further, the plastic film in the base sheet has mechanical strength such as piercing resistance required for the packaging material.

Further, the polyethylene film layer containing the antistatic agent laminated on the other surface of the base sheet is used for the content in the packaging bag using the transparent, conductive and moisture-proof laminated sheet of the present invention. In addition to the function of preventing static electricity damage due to friction generated between the packaging bag and the package bag, the package has a heat-welding property such that a sealed portion of the packaging bag can be formed by heat sealing.

[0021]

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

[Example 1] In FIG.
After forming an aluminum vapor-deposited layer “conductivity: 200Ω” 3 on the surface of the biaxially stretched polyethylene terephthalate film 2 of μ, and forming a vapor-deposited layer 4 of 200-300 mm thick tin oxide on the back surface, The indicated substrate sheet was obtained.

Subsequently, a 12 μm thick polyethylene terephthalate film 6 that has been subjected to antistatic treatment is laminated on the surface of the tin oxide vapor deposition layer 4 of the base sheet 5 using a polyurethane adhesive 7. By laminating a 30 μm thick polyethylene film 8 containing an antistatic agent of a cationic surfactant on the surface of the aluminum vapor deposition layer 3 via an extrusion coat layer 9 of a 20 μm thick polyethylene resin. Thus, a transparent / conductive / moisture-proof laminated sheet which is an example of the present invention was obtained.

Example 2 In FIG. 2, a thickness 25 having an aluminum deposition layer “conductive: 200 Ω” 12
μ transparent biaxially stretched polyethylene terephthalate film for the second substrate “heat ray shielding film:
Lumicool M type ( ^# 25) FB-50 silver, thickness of aluminum deposition layer = 200 ~ 300mm "1
(1) A first base film made of a biaxially stretched polyethylene terephthalate film having a thickness of 25 μm and having a surface of an aluminum oxide layer (thickness of aluminum oxide (AlO _x ) = 20)
(0Å300 °)) A base sheet indicated by reference numeral 17 is obtained by laminating the aluminum oxide vapor-deposited layer 14 surface with a polyurethane-based adhesive 16,
An antistatic agent made of a cationic surfactant is applied to the biaxially stretched polyethylene terephthalate film surface of the first base material film 15 in the base material sheet 17 via a polyethylene resin extrusion coat layer 18 having a thickness of 20 μm. The contained polyethylene film 19 having a thickness of 30 μ was laminated.

Subsequently, a solution obtained by diluting the antistatic agent "Statiside: Takihara Sangyo Co., Ltd." 200 times with isopropyl alcohol was applied to the surface of the biaxially stretched polyethylene terephthalate film of the second base film 13 described above. , Edition 2
It was coated with a 0 μm gravure plate to obtain a transparent / conductive / moisture-proof laminated sheet 11 which is another example of the present invention.

[Experiment] The transparent material obtained in Example 2
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 resistivity (Ω / □) TR8601 manufactured by Advantest 2 Half-life (second) Static honest meter (S-5109 manufactured by TOA) 3 Puncture strength (kg) Food Sanitation Law No. 20 4 Heat seal strength (kg) / 15 mm width) 5 Moisture permeability (g / m ² · day) JIS Z 0208 6 Oxygen permeability (g / m ² · day · atm) 23 ° C,
0% RH 7 Electrostatic shield characteristics (V) MIL-B-1705C

[0028]

[Table 1]

Example 3 A 25-μm thick biaxially stretched polyethylene terephthalate film having an aluminum vapor-deposited layer “conductivity: 200 Ω” on the surface was coated on the aluminum-deposited layer with a 25 μm-thick 2 μm-thick polyurethane adhesive.
Laminated axially stretched polyethylene terephthalate film,
A second base film was obtained.

Further, a 25 μm-thick biaxially stretched polyethylene terephthalate film having a tin oxide deposited layer “thickness of the deposited layer = 200 to 300 °” on the surface is coated with a polyurethane adhesive on the aluminum deposited layer. A 25 μm biaxially stretched polyethylene terephthalate film was laminated to obtain a first base film.

Subsequently, the first base film and the second base film were further laminated using a polyurethane adhesive to form a base sheet.

Further, a thickness containing an antistatic agent of a cationic surfactant on the first base material film surface of the base material sheet via an extruded coat layer of polyethylene resin having a thickness of 20 μm. A 30μ polyethylene film was laminated.

Further, a solution obtained by diluting the antistatic agent “Statiside: Takihara Sangyo Co., Ltd.” 200 times with isopropyl alcohol was applied to the second base film surface.
It was coated with a 0μ gravure plate to obtain a transparent, conductive and moisture-proof laminated sheet which is another example of the present invention.

Example 4 After forming an aluminum vapor-deposited layer "conductivity: 200 Ω" on the surface of a biaxially stretched polyethylene terephthalate film having a thickness of 25 μm, vapor-depositing 200-300 ° thick tin oxide on the aluminum vapor-deposited layer surface. The base sheet was obtained by forming a layer.

Subsequently, a 12 μm-thick polyethylene terephthalate film, which has been subjected to antistatic treatment, is laminated on the tin oxide vapor-deposited layer surface of the base sheet using a polyurethane-based adhesive. By laminating a 30 μm thick polyethylene film containing an antistatic agent of a cationic surfactant via an extrusion coat layer of a 20 μm thick polyethylene resin, another embodiment of the present invention is provided. Was obtained as a transparent, conductive and moisture-proof laminated sheet.

[0036]

The transparent / conductive / 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 electrostatic damage due to friction with the 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., and puncture resistance. It has excellent mechanical performance and also 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 / moisture-proof laminated sheet of the present invention has an electrostatic shield characteristic of MIL standard (B-170).
Since the packaging bag has a numerical value that clears 5) and has an electrostatic shielding property within the MIL standard, it has an effect of being excellent in 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 cross-sectional view schematically showing another embodiment of 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 ... Plastic film 3 ... Evaporated aluminum layer having a thickness of 20 to 400 mm 4 ... Evaporated layer of tin oxide 5 ... Base sheet 6 ... Polyethylene terephthalate film subjected to antistatic treatment Layer 8: Polyethylene resin layer containing antistatic agent

Claims (4)

(57) [Claims] 1. A base sheet comprising a plastic film, one surface of which is coated with a deposited layer of tin oxide, aluminum oxide or silicon oxide, and the other surface is coated with a deposited layer of aluminum having a thickness of 20 to 400 °. And an antistatic treated polyester, polypropylene or polystyrene film layer laminated on one side of the substrate sheet, and an antistatic agent laminated on the other side of the substrate sheet. A transparent, conductive and moisture-proof laminated sheet comprising a polyethylene film layer. 2. A deposition layer surface of a first substrate film made of a plastic film having a deposition layer of tin oxide, aluminum oxide or silicon oxide, and a thickness of 20 to 400 °.
A base sheet is formed by a laminated sheet which is adhered so as to be in contact with an aluminum-deposited layer surface of a second base film made of a plastic film having an aluminum-deposited layer of one of the base sheets. Is subjected to an antistatic treatment, and a polyethylene film layer containing an antistatic agent is laminated on the other surface of the base sheet, wherein the transparent, conductive, and moistureproof Laminated sheet. 3. A first base film in which another plastic film is adhered to a vapor-deposited layer surface of a plastic film having a vapor-deposited layer of tin oxide, aluminum oxide or silicon oxide, and aluminum having a thickness of 20 to 400 °. A base sheet is formed by a laminated sheet in which another plastic film is adhered to a second base film in which another plastic film is adhered to the front surface of the base film. Is subjected to an antistatic treatment, and a polyethylene film layer containing an antistatic agent is laminated on the other surface of the base sheet, wherein the transparent, conductive, and moistureproof Laminated sheet. 4. A base sheet made of a plastic film having on one surface a deposited layer of tin oxide, aluminum oxide or silicon oxide and a deposited layer of aluminum having a thickness of 20 to 400.degree. An antistatic treated polyester, polypropylene or polystyrene film layer laminated on the vapor-deposited layer surface of a material sheet, and a polyethylene film layer containing an antistatic agent laminated on the non-deposited layer surface of the substrate sheet A transparent, conductive and moisture-proof laminated sheet having the following.