JPS63303726A - Laminated film - Google Patents

Abstract

PURPOSE:To interrupt vapor or oxygen from intruding into the title film by preventing generation of static electricity, by a method wherein a conductive layer is provided on a surface layer part on one side of a supporting layer and a barrier layer obtained by laminating an aluminum foil and an antistatic sealant layer are provided respectively on the other side and a surface layer part of the other side. CONSTITUTION:A supporting layer 1 is formed of hard synthetic resin having the melting point of 140 deg.C or higher. A conductive layer 2 is of a layer whose surface electric resistance is low, which is, for example, constituted of a coating of carbon black or a metallized film of a metal or a coating of metallic fine powder which is superior in conductivity and formed on one side of the supporting layer 1. A barrier layer 3 is formed by laminating an aluminum foil, a thickness of 7-20mum is preferable for the aluminum foil and the aluminum foil is provided on the other side of the supporting layer 1 prior to laying of the conductive layer 2. An antistatic sealant layer 4 is decided to be a resin layer obtainable by applying an antistatic agent to heat-meltable resin or kneading the same into the heat-meltable resin and provided on the surface layer part of the other side of the supporting layer 1. The heat-meltable resin is synthetic resin having the melting point of 200 deg.C or lower and is heat-fusable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to electronic components such as ICs and LSIs,
This invention relates to a laminated film suitable for packaging items that are susceptible to damage caused by static electricity, etc.

[Prior Art] Conventionally, laminated films used for packaging electronic parts, etc., have been known in which a polyolefin film containing 5 to 50 parts by weight of carbon black is laminated on one or both sides of a polyolefin base material. (Japanese Unexamined Patent Publication No. 58-24449). This laminated film uses a polyolefin film containing carbon black as a conductive layer to provide conductivity to prevent electrostatic damage.

[Problems to be Solved by the Invention] Incidentally, it is known that electronic components are susceptible to damage not only from static electricity but also from water vapor and oxygen.

For example, it is known that when electronic components with thin packages, such as flat package ICs, are assembled onto a board, if soldering is performed at high temperatures such as paper face soldering, the package may crack. .

Recent research has shown that this phenomenon can be applied to flat package ICs.
It has been revealed that this occurs because moisture is absorbed through the package, and this moisture is rapidly heated to high temperatures during soldering, evaporates, and expands rapidly. It is also known that there are electronic components such as magnetic disks that are not only sensitive to static electricity but also susceptible to oxidative damage due to moisture and oxygen.

However, although the conventional laminated films are effective in preventing static electricity damage, they have poor water vapor barrier properties and oxygen barrier properties, and have a problem in that it is difficult to effectively protect packaged articles from the above-mentioned damage.

[Means and effects for solving the problems] The means taken in the present invention to solve the above problems will be explained based on FIG. 1 showing an example of the layer structure of the laminated film according to the present invention. , the present invention has a conductive layer 2 on the surface layer of one side of the support layer 1, and a barrier layer 3 laminated with aluminum foil on the other side of the support layer 1, and an antistatic layer on the surface layer of the other side. A method of forming a laminated film having a sealant layer 4 is taken.

The present invention will be further explained in detail below.

(1) Support layer 1 The support layer 1 is made of a hard synthetic resin, especially with a melting point of 1
Those made of hard synthetic resin with a temperature of 40°C or higher. For example, nylon-6 (My-6), nylon-6
66 (Ny-66), nylon-610 (Ny-610
) and other polyamide resins: polyethylene terephthalate (
PET), aromatic polyester resins such as polybutylene terephthalate (PB), which not only have excellent heat resistance, but also have high strength and barrier properties, are preferable, and supports made of these hard synthetic resins. layer 1
A biaxially oriented film layer is preferable because various physical properties such as strength are good.

Biaxially oriented polypropylene film (OPP), biaxially oriented polystyrene film, two-wheel oriented polyvinyl alcohol film, and biaxially oriented ethylene-vinyl alcohol copolymer film may also be used as the support layer of the present invention, although their physical properties are somewhat inferior to the above resins. It can be used as l.

The thickness of the support layer 1 is preferably selected within the range of 5 Bm to 1004 m. If it is too thin, the strength of the entire film will be weakened, and if it is too thick, it will be difficult to handle as a packaging film.

The supporting layer l is not limited to just one layer as shown in FIG. 1, but may be provided in multiple layers with an auxiliary layer 6 interposed therebetween as shown in FIG. 2. In this case, the entire supporting layer l It is preferable that the total thickness is within the above range.

(2) Conductive layer 2 The conductive layer 2 is a layer with low surface electrical resistance, and is composed of, for example, a coating film of carbon black, a vapor deposited film of a metal with excellent conductivity, a coating film of fine metal powder, etc. It is something that exists. The conductive layer 2 composed of these is usually
Although it is formed on one side of the support layer 1, for example, an undercoat layer or the like may be interposed between the support layer 1 and the support layer 1 to improve the adhesion between the conductive layer 2 and the support layer 1. In order to increase the adhesion of the support layer 1, the surface of the support layer 1 may be subjected to a pretreatment such as a corona discharge treatment.

When the conductive layer 2 is formed using a coating film of carbon black, it can be formed by applying a conductive paint containing carbon black. This conductive coating material can be obtained by adding a binder, a dispersant, or a dispersion medium, if necessary, in addition to carbon black as a conductive component.

Preferably, the carbon black is selected from those for conductive fillers. Specific examples include Ketjenbrak,
Examples include furnace black, acetylene black, channel black, and thermal black.

It is preferable to select a binder that has as good adhesion as possible to the support layer 1 and helps the carbon black to be dispersed as much as possible. As a binder, for example, EV
Latexes such as A latex, acrylic latex, and SB latex, PVA, cellulose derivatives, starch derivatives, and resins that are dissolved in a solvent such as acrylic resin, EVA resin, and styrene resin are used.

As a dispersant, a surfactant may be added if desired.

Latexes usually contain some amount of surfactant, and in some cases, it may not be necessary to add a dispersant. In addition, since a binder dissolved in a solvent may also act as a dispersant, whether or not to use a dispersant and the amount thereof to be used may be determined depending on the necessity of each case.

The amount of carbon black applied as a conductive paint varies depending on the type of carbon black and the state of dispersion, but it is 0.
．． 013/m2 or more is desirable; if the coating amount is less than this, it is difficult to express the necessary conductive performance; and the thickness of the conductive layer 2,
That is, it is preferable that the average thickness of the layer in which carbon black is formed in a substantially continuous layer is equal to or larger than Q, Ofgm.

The concentration of carbon black when used as the conductive layer 2 varies depending on the type of carbon black used, but it is usually about 8% by weight or more, and the higher the concentration, the higher the concentration is 100 i.
% carbon black may be used. That is, a coating film can be formed by aggregation of carbon particles without using any binder, and this may be used as the leading conductive layer 2.

As the conductive layer 2 in the present invention, a metal vapor deposited film or a conductive paint film containing fine metal powder can be used instead of the carbon black film as described above. Metals that can be used for this metal vapor deposition film include aluminum,
Examples include nickel, titanium, magnesium, and the like. The thickness of the metal evaporated film is IOA~5000A, preferably 50~
It is desirable to select from the range of 100OA from the viewpoint of both conductivity and economy.Metals that can be used in conductive paint containing fine metal powder include tin-antimony and indium-antimony.
Examples include tin oxide, tin oxide, etc., and polyester resins, acrylic resins, etc. are used as the binder, and a dispersion of these in water or an organic solvent may be used for coating.

The conductive layer 2 is usually formed on one side of the support layer 1 in a fairly uniform manner, but it is also possible to intentionally make it thicker, thinner, or darker to obtain a design effect. You can add patterns.

The conductive layer 2 is usually formed as a surface layer, but as shown in FIG. This is preferable because it can protect the conductive layer 2. Even when this surface layer 5 is provided, the conductive layer 2 must be located on the surface layer. It is preferable to have a structure in which a part of 2 protrudes from the surface layer 5. Such a protruding structure can be created by various methods, and will be explained below using an example in which the conductive layer 2 is formed with a carbon black coating.

First, by creating a mechanically weak conductive layer 2 with a low binder content and coating the surface layer 5 on top of it, the mechanical action of the coating liquid and coating device when coating and forming the surface layer 5 is reduced. Accordingly, the conductive layer 2 can be deformed to form a protrusion.

Second, it is also possible to apply a conductive paint that is difficult to level in fine dots using a gravure coater or the like, and leave the transferred minute dots as protrusions.

Thirdly, a method of including aggregated particles of carbon black in the conductive paint can also be used. That is, the particles in which carbon black has aggregated protrude from the conductive layer 2 toward the surface layer 5 to form a protrusion.

In addition to carbon, the protrusions can also be created by mixing minute particles of a conductor such as graphite or metal.

Fourth, it is also possible to mix fine powder that easily adsorbs carbon to form fine particles to which carbon is adsorbed, thereby creating protrusions.

The amount of protrusions is difficult to analyze and has not been fully elucidated quantitatively, but it is sufficient that the protrusions are present to the extent that they can be easily discovered by observing with a microscope.

By adopting such a special structure, the surface resistance of the surface layer 5 can be significantly reduced. Although the details of this effect are unknown, it is assumed that the protruding portion of the conductive layer 2 toward the surface layer 5 tends to cause charge concentration.
It is also conceivable that charge diffusion between the surface and the conductive layer 2 occurs mainly through the protrusions of the conductive layer 2.

The surface layer 5 can be provided by directly overlapping the conductive layer 2 with a synthetic resin paint. This surface layer 5
Since this forms a surface layer, it is preferable to select one that satisfies the surface properties required for a packaging material, such as hardness, gloss, slipperiness, and blocking resistance.

Since the surface layer 5 is the surface layer of the antistatic plastic film, it is usually thought that a synthetic resin with low electrical resistance should be used, but this is not always necessary; in other words, the volume resistance of the resin itself Even if a normal thermoplastic resin such as polyolefin is used, which has a very high resistivity, the surface layer 5 formed by coating directly on the conductive layer 2 as described above can have a very low surface resistivity. I found that. Although this was a completely unexpected effect, it can be understood that it is caused by providing the conductive layer 2 with a portion that protrudes from the surface layer 5.

Examples of resins that can be used as the surface layer 5 include polystyrene, polyvinyl chloride, cellulose plastics such as nitrified cotton, polyethylene, EVA, polyacrylic ester,
Thermoplastic resins such as polymethacrylic acid ester, polyvinylidene chloride, polyamide, and polyester, and thermosetting resins such as phenol resins and epoxy resins can be applied in the form of emulsions or solutions. It is also possible to apply a polymerizable monomer to form a polymerized film.

Acrylic resins such as polyacrylic esters and polymethacrylic esters are particularly preferred in terms of strength, adhesiveness, transparency, and the like.

Various additives such as waxes can be added to the surface layer 5 for the purpose of improving slipperiness, improving wear resistance, etc. Polyethylene wax improves wear resistance,
Since it is less likely to contaminate other materials, the particularly preferred thickness of the surface layer 5 is between 0.2 .mu.m and 10p layer. A surface layer 5 thicker than 10 gm will result in insufficient antistatic effect, and a surface layer 5 thinner than 0.2 gm will result in insufficient mechanical strength of the coating.

When forming the conductive layer 2 using a conductive paint containing carbon black, if the carbon black concentration in the non-volatile content of the conductive paint increases to 70% by weight or more, the supporting layer l
Adhesive strength with the material is also often insufficient. However, as the concentration of carbon black increases, the conductive layer 2 exhibits better conductivity even if the thickness of the conductive layer 2 is reduced. At this time, the coating film of the conductive paint seems to be easily penetrated by the liquid, so when the synthetic resin paint is applied directly on the conductive layer 2 to form the surface layer 5, the conductive layer of carbon black The synthetic resin paint can be permeated to the support layer 1 with almost no decrease in conductivity. Therefore, by selecting the synthetic resin for the surface layer 5 from among those having good adhesion to the support layer l, the adhesion between the conductive layer 2 and the support layer l can be improved.

(3) Barrier layer 3 The barrier layer 3 is formed by laminating aluminum foil.

The aluminum foil constituting the barrier layer 3 has a thickness of 4 to 30 mm, preferably 7 to 20 mm. If it is too thin, there will be many pinholes due to the manufacturing technology of aluminum foil, making it difficult to obtain the desired barrier properties.On the other hand, if it is too thick, it will be difficult to handle as a packaging material. This makes it easier to reduce the temperature and increases the cost.

The barrier layer 3 can be easily formed by laminating aluminum foil to the support layer 1 prior to the application of the conductor R2 to the support layer 1. Further, when providing an auxiliary layer 6 as shown in FIG. 2, this can also be easily done by laminating aluminum foil and a support layer l on the conductive layer 2 side with this auxiliary layer 6 as the center. . Particularly in the latter case, there is an advantage that the support layer l on the conductive R2 side can be either stretched or unstretched. For laminate,
For example, general methods such as dry lamination and PE extrusion lamination can be used.

The auxiliary layer 6 may be made of the same synthetic resin as the support layer 1, but may also be made of other synthetic resin such as aluminum foil or a synthetic resin suitable for laminating the support layer 1. For example, a thermofusible resin described below can be suitably used.

(4) Antistatic sheet tent layer 4 The antistatic sealant layer 4 consists of ■ a resin layer in which an antistatic agent is applied or kneaded into a heat-melting resin, and furthermore, a conductive layer 2 is formed on the support layer l. Similarly to the above, a conductive layer 2 is formed on a support layer 1 by coating a carbon black coating layer, a vapor-deposited metal thin film, or a fine metal powder coating on a heat-melting resin layer. Similarly to the above case, a synthetic resin layer having a thickness of 0.2 to 10 g may be formed as a surface layer on the surface of carbon black, a metal vapor-deposited thin film, or a fine metal powder coating.

Here, the heat-melting resin is a synthetic resin that has a melting point of 200° C. or less and is heat-sealable. Examples of heat-melting resins include low-density polyethylene (LDPE), high-density polyethylene (HDPE), and linear low-density polyethylene (L
-LDPE), polyolefin resins such as low-crystalline polypropylene; ethylene-vinyl acetate copolymer (EV
A) One or more types of ethylene ionomer (IR) can be used.

As the antistatic agent applied or kneaded into the hot melt resin, various anionic, cationic, and nonionic surfactants are used, and these are used alone or in combination. Examples of anionic surfactants include sulfuric acid esters and alkyl phosphates of polyoxyethylene alkyl ether, and examples of cationic surfactants include quaternary ammonium salts such as distearyldimethylammonium chloride. Examples of surfactants include polyethylene glycol fatty acid esters and siloxane surfactants.

When providing a coating layer of carbon black, a vapor-deposited thin film of metal, or a coating layer of fine metal powder on the heat-melting resin layer, it is carried out in the same manner as in forming the conductive layer 2 on the support layer 1. By forming a synthetic resin layer with a thickness of 0.2 to 10 gm on the surface layer, the heat-melting resin layer forms the inner surface of the bag, and when the contents are put in it, it is wear-resistant. When providing a synthetic resin layer as a surface layer, it is desirable to use a synthetic resin that does not impede heat-sealability.For example, polystyrene, polyvinyl chloride, poly(4-ethylene) , EVA, polyacrylic ester, polymethacrylic ester, polyvinylidene chloride, polyamide, polyester, and other thermoplastic resins are suitable.

The thickness of the antistatic sealant layer 4 is from 10μ layer to 100μ layer.
Preferably, the intestine has a thickness of 10. If it is less than pm, the sealing strength when forming a bag will be insufficient. 10
If it is more than 0gm, it will be difficult to seal when making bags,
Economically disadvantageous.

(5) Specific examples of layer structure Next, examples of preferable layer structures of the laminated film of the present invention will be given.

(1) CB/PET/AJ) Foil/PE (Charged) (
2) Surface layer/CB/PET/Ai) Foil/PE (electrostatic)
(3) Surface layer/CB/PET/Ai) Foil/PE/PE (
Charged) (4) Surface layer/CB/PET/PE/Aβ foil/PE
T/PE (Charged) (5) Surface layer/CB/PET/PE
/Ai' foil/PET/PE/PE (charged) (6) V
MAi)/PET/Af foil/PE Foil band PE (7) Surface layer/VMAill/PET/AI! Foil/PE C charged) (8) Surface layer/VMAj)/PET/A4 foil/PK/P
E (Charged) (9) Surface layer/VIIAi)/PET/PE
/Ai' foil/PET/PE (electrostatic) (10) Surface layer/
VMAi'/PET/PE/Ai) Foil/PET/PE/
PE (Charged) (11)08/PET/Ai) Foil/PE
/CB(12) Surface layer/CB/PET//Aj) Foil/Pg
/CB/Surface layer (13) Surface layer/CBIPET/PE/AR
Foil/PET/PE/CB/Surface layer (14) Surface layer/CB/P
ET/PH/Ai) Foil/PE/PE (Charged) (15)
Surface layer/CB/PET/PE/Ai' foil/PE/CB/Surface layer However, the symbols of the above layer structure have the following meanings.

CB2 Carbon black coating layer PET: Polyethylene terephthalate layer AI! Nialuminum foil PE: polyethylene layer VMAi) Nialuminum vapor deposited layer Among the above layer configurations, the film with the layer configuration (1) is made of PET
Ai) foil is laminated on one side of the Aβ foil, the other side is coated with carbon black, and then polyethylene containing an antistatic agent is extruded and laminated on the Aβ foil surface.

The film with the layer structure (2) above has a surface layer formed on the CB layer surface of the film (1), and is intended to increase the durability of the conductive layer by protecting the CB layer surface. This film can be produced by adding an operation for forming a surface layer to the film production method (1).

The film with the layer structure (3) above can be manufactured at low cost by making the polyethylene layer containing an antistatic agent in the antistatic sealant layer as thin as possible, and replacing it with a polyethylene layer containing no antistatic agent. Either polyethylene and antistatic agent-containing polyethylene are simultaneously extruded and laminated, or a separate film of antistatic agent-containing polyethylene is made and then the surface layer/CB/PET/Aβ foil is layered via extruded polyethylene. It can be produced in the same manner as in the case of the film (2) except that it is laminated on the Al foil surface of the laminate.

The film with the layer structure of (4) above has two supporting layers,
One support layer is coated with carbon black, and the other support layer is provided with an AP foil layer. Then, the surface layer/Ill:B/PE was prepared separately.
It can be produced by laminating T and Aβ foil/PE foil through extruded polyethylene, and then extruding a runt layer of polyethylene blended with an antistatic agent.

Since this film (4) is placed inside the PET support layer, the Ai foil is more strongly reinforced and protected by the PE7 layer, and the AI! The water vapor barrier properties of the foil become more reliable.

The above film (5) is a film in which the PE (charged) of the film (4) is replaced with PE/PE (charged),
(This is an attempt to reduce costs by making the PE (charged) layer of the 0 film thinner.

Next, the film having the layer structure of (6) to (10) above is (1
) to (5), the 08 layers are replaced with 12 VMA layers, and the manufacturing method and characteristics of each laminated film are those of the corresponding CBR.
This is almost the same as described for the film.

The film with the layer structure of (11) above has Ai on one side of PET.
) After providing a foil and coating the other side with carbon black, it is obtained by extruding polyethylene containing no antistatic agent and coating the surface with carbon black.

The film with the layer structure (12) above has surface layers formed on both sides of the CB layer surface of the film (11), and is intended to increase the durability of the conductive layer by protecting the CB layer surface. .

The film with the layer structure of (13) above has two supporting layers, one supporting layer is coated with carbon black and a surface layer, and the other supporting layer is provided with Al1 foil. . Then, the surface layer /CB/
To PET! After laminating the foil/PET via extruded polyethylene, polyethylene was extruded onto the 7th surface of the PE, carbon black was applied to that surface, and a surface layer was further provided.

The film with the layer structure (14) above has a single support layer of the film (5), and the film with the layer structure (15) above has a single support layer of the film (13).

[Function] The laminated film according to the present invention usually has a conductive layer. It is used for packaging articles with the side facing outward, and the conductive layer 2 prevents the articles from being damaged by the static electricity of the human body when, for example, a worker touches the package. Further, the antistatic sealant layer 4 prevents the generation of static electricity due to the contact between the laminated film and the packaged article.

On the other hand, the barrier layer 3 made of aluminum foil blocks the entry of water vapor, oxygen, etc., and prevents damage to the article due to these. In particular, the barrier layer 3 in the present invention is
Since it is made of aluminum foil, it has high barrier properties.

Furthermore, in the present invention, the conductive layer 2 and the barrier layer 3 are located on opposite sides with the support layer l in between. As a result, even if carbon black or fine metal powder is used in the conductive layer 2, the barrier layer 3 will not be damaged by these particles and its barrier properties will not deteriorate. By subjecting the support layer to external forces,
It is possible to protect the barrier layer 4 with.

[Example] First, the usage mode of the laminated film according to the present invention will be explained.

This laminated film is usually formed into a bag shape and used for hermetically packaging articles, and the bags shown in FIGS. 3 and 4 are preferred. This will be explained below.

The bag shown in FIGS. 3 and 4 is made by welding and sealing the edges of the two main laminated films A forming the front and back surfaces, excluding the top edge, and the periphery of the transparent film B forming the bottom surface. In FIG. 0, the shaded part is the welded seal part 7.

Transparent film B is used to allow the contents to be seen even after sealing, and is preferably transparent, but as long as the contents can be confirmed, it should be semi-transparent rather than completely transparent. It may be.

However, from the viewpoint of protecting the contents, it is preferable to have antistatic properties and barrier properties as much as possible.

As a specific example of transparent film B, the present laminated film A
Among the layers constituting the layer, examples include one in which the barrier layer 3 of aluminum foil is removed, and one in which peeling is replaced with vinylidene chloride resin layer. In this case, a transparent synthetic resin is used for each layer, and the thickness of the conductive layer 2 is adjusted to obtain the necessary transparency. In particular, conductive layer 2
When a carbon black coating is used as a carbon black coating, its average thickness is 0.01. The coating amount of carbon black is 0.01 g/layer, preferably 0.01 layer to 1 layer.
+*2~0.8g/m2, preferably 0.01g/m
It is desirable to set it to 2-0.1 g/m2, and if it is in this range, necessary transparency and conductivity can be satisfied at the same time.

Further, by forming the conductive layer 2 in a stripe or mesh shape, transparency can be provided. in this case,
It is preferable that the line spacing is 20 Il or less and the line width is 2 mm or less.

In the case of a bag as described above, due to the presence of the transparent film B, the barrier properties of the entire bag are somewhat lower than when the entire bag is composed of the laminated film A, but on the other hand, the handling of the package is improved. is obtained. However, since it is necessary to avoid a large drop in the barrier properties of the entire bag, the area of the transparent film B surrounded by the sealing part 7 should be 10% or less, preferably 5% or less, of the total internal area of the bag after sealing. It is desirable that

As another example of a bag using this laminated film, as shown in FIG. One example is one that is welded and sealed.

Example 1 A dispersion consisting of 0% by weight of Ketjenblack ECl from Lion Akzo Co., Ltd., which is carbon black reprinted as a conductive filler, 8% by weight of a nonionic surfactant as a dispersant, and the balance water. Had made. Separately, as a binder, a solution was prepared in which 9.2% by weight of partially saponified vinyl acetate was dissolved in a mixed solvent of methanol and water in a mixed weight ratio of 90:10.

While stirring 40 parts by weight of carbon black dispersion,
Adding 60 parts by weight of binder solution, 4% by weight of carbon black, 3.2% by weight of surfactant, 5% by weight of binder.
．． A conductive paint was prepared in which the solvent contained 5% by weight of methanol and water at a mixing ratio of 56:44 by weight. The nonvolatile content of this conductive paint is 12.7% by weight.
31% by weight of the non-volatile content is carbon black.

When a mixed solvent of methanol and water is used as a solvent, it increases the drying speed compared to water, lowers the surface tension, makes it easier to apply to the surface of the synthetic resin, and also improves the dispersion of nonionic surfactants. The effect can be reduced somewhat to facilitate the formation of slightly agglomerated particles of carbon black.

One side of a biaxially stretched polyester film with a thickness of 12 gm was subjected to corona discharge treatment, and the above conductive paint was applied to this side in a dry amount of 0.23/s2 using a gravure coater, dried, and overlaid with methyl methacrylate. A top coat using toluene as a solvent and containing 14.7% by weight of an acrylic resin mainly composed of
g/Peng 2 was coated and dried to obtain a laminate CI) having a layer structure of surface layer/CB/PET.

Assuming that the specific gravity of the dried solid material of each paint is 1, the thickness of the conductive layer is approximately 0.2 μm, and the thickness of the surface layer is approximately Igm. Carbon black is applied at a rate of 0.06g/2 shoes.

When a cross section of the conductive layer and surface layer side of this film was observed under a microscope, it was found that carbon black partially protruded from the surface layer.

Carbon black non-coated surface of laminate (I) and 10Bm
Apply polyethyleneimine (BASF Borimin-P) as an anchor coating agent to one side of the aluminum foil using the gravure coating method, dry it, and extrude polyethylene in a 20μ layer from an extruder T-die to form the laminate (I) and aluminum. The foils are laminated via an anchor coating agent, and the surface layer/C
A layer structure (n) of B/PET/PE/Ai' foil was obtained. Next, apply a polyurethane anchor coating agent (Toyo Morton AD-527+ AD-9L-1) to the aluminum foil surface.
) was coated and dried, extruded polyethylene with a thickness of 30 mm, and further extruded a 20 μm polyethylene sheet containing 0.7% by weight of Chemistat 1100 manufactured by Sanyo Chemical Industries, Ltd., a nonionic antistatic agent, and laminated them to form the following layers. A conductive barrier film having configuration (m) was obtained. Note that it is not necessary to apply the anchor coating agent to the aluminum foil.

Surface layer/CB/PET/PE/Af foil/PE/PE (Charging) The surface resistance of the surface layer of this laminate (m) is 9 x 10
5Ω, surface resistance of heat seal layer is 8 x 1011Ω
Met.

When this film was heat-sealed with the PE side inside to make a bag, a bag with good bag-making processability and easy handling was obtained. In addition, using a JIS L 1048 Gakushin friction tester, a test film was placed on the friction element instead of a white cloth, and a film-to-film friction test was performed to determine the resistance until the surface resistance loses its initial value and stands up. The number of frictions was measured. This film was used 25,000 times. Since several bags of this type are often used at the same time, the abrasion resistance of the same film is important in practical terms, and this film has been shown to have extremely excellent abrasion resistance. .

In addition, the water vapor permeability of this conductive barrier film is J
As measured according to IS 20208, 0.1g/
It was less than 124 hours.

Example 2 Using a biaxially stretched polyester film with a thickness of 12 mm,
When the cross section of the 0 surface layer and conductive layer obtained from the laminate (I) of Example 1 was observed with a microscope in the same manner as in Example 1, it was found that Example 2
Similarly, it was observed that carbon black partially protruded from the surface layer.

The above laminate (1) and the aluminum foil of Example 1 were laminated in the same manner as in Example 1, and the surface layer/CB/PET/PE
/Ai' foil layer structure (II) was obtained. Next, polyethylene without antistatic agent was extruded onto the aluminum foil surface.
After lamination, the polyethylene surface was subjected to corona discharge treatment, and the carbon black conductive paint of Example 1 was applied to this surface in a dry amount of 0.
．． 15g/m2 Coated with a gravure coater and dried, overlaid with Ig/m2 of the surface layer paint of Example 1 and dried, layer structure (■) 2 surface layers/CB/PE/PE
A laminated film of /Ai' foil/PE/CB7 surface layer was obtained.

The surface resistance of the surface layer of this laminate 1) is 9 x 105Ω,
The surface resistance of the heat seal layer was 2×10 7 Ω. Furthermore, the friction resistance was 25,000 times on both the outside and inside, and the water vapor permeability was less than 0.1 g/m2·24 hr.

[Effects of the Invention] The laminated film of the present invention has excellent barrier properties as well as conductivity, so when used especially for packaging electronic components, etc., damage during transportation and storage can be significantly reduced. It is something that can be done.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams schematically showing an example of the layer structure of the laminated film according to the present invention, and FIGS. 3 and 4 are perspective views showing an example of a bag using the laminated film, FIG. 5 is a perspective view showing an example of the same location. 1: support layer, 2: conductive layer, 3: barrier layer, 4: antistatic sealant layer.

Claims (1)

[Claims] 1) The support layer has a conductive layer on the surface layer on one side, a barrier layer laminated with aluminum foil on the other side of the support layer, and an antistatic sealant layer on the surface layer on the other side. Laminated film.