JP2003311896A - Sealant film, laminated film, and packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealant film and a laminated film both of which are excellent in antistatic properties and whitening resistance, and to provide a packaging bag excellent in antistatic properties and whitening resistance using the sealant film or the laminated film. <P>SOLUTION: The sealant film has at least a support layer 1 based on a polyolefinic resin, and the heat seal layer 2 based on the polyolefin resin formed on the support layer 1. The saturated charge voltage of the surface of the heat seal layer 2 is not more than 500 V, and the half-life of the saturated charge voltage is not more than 30 s. The laminated film is constituted by laminating a substrate layer on the surface on the side opposite to the surface having the heat seal layer 2 formed thereon of the support layer 1 of the sealant film. The packaging bag is formed using the sealant film or the laminated film. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealant film and a laminate film which are excellent in antistatic property and whitening resistance, and in particular, a sealant film and laminate film which has an antistatic property suitable as a packaging material for foods, chemicals, electronic parts and the like. Regarding film. Further, the present invention relates to a packaging bag using the sealant film or the laminated film.

[0002]

2. Description of the Related Art Conventionally, foods in the form of powder or flakes, chemicals in powder or granules, and electronic parts are generally packaged with a packaging material made of a plastic film laminate. ing. Polyolefin film laminate materials are often used as packaging materials for such foods, medicines, and electronic parts.

Since a polyolefin film generally has a high surface resistivity, when a packaging material made of a polyolefin film is used, friction and static electricity are generated when the contents are filled and taken out.

Due to the generation of static electricity, for example, when a laminated film consisting of three layers of polypropylene / ethylene vinyl alcohol copolymer / polyethylene is used for food packaging, specifically, shaving knot packaging When the contents are filled in the three-way heat-sealed bag, static electricity may be generated on the polyethylene surface, which is the inner surface of the bag, and the contents may be sealed while being attached to the seal portion.
Poor sealing may cause poor sealing inside the package and poor appearance.

Also, when a powdered or granular drug or the like is packed using a laminated film composed of two layers of cellophane / polyethylene, static electricity is generated on the polyethylene surface, which is the inner surface of the bag, and the same as above. Problems occur.

Therefore, the polyethylene on the inner surface of the bag and the polypropylene on the outer surface of the bag are kneaded with a surfactant type antistatic agent and subjected to an antistatic treatment to prevent generation of static electricity during filling of the contents.

Further, also in the packaging of electronic parts and the like, when a laminated film composed of two layers of polyester / polyethylene is used, static electricity is generated on the polyethylene surface which is the inner surface of the bag, and the same problem as described above occurs.

For this reason, the polyethylene on the inner surface of the bag is kneaded with a surfactant type antistatic agent in the same manner as described above, and an antistatic coating is formed on the polyester surface to perform antistatic treatment. Prevents the generation of static electricity.

However, it has been found that there are various problems in imparting the antistatic property by kneading a surfactant type antistatic agent. That is, the surfactant has problems such as a decrease in adhesive strength due to bleed-out, poor appearance due to whitening over time, and instability of non-charging property over time. Further, in the packaging of foods, medicines and the like, there is an adverse effect of migration of the surfactant to the contents, and it is difficult to say that the use of the surfactant is always good from the viewpoint of hygiene. Further, in the packaging of electronic parts and the like, contamination of the electronic parts due to the adhesion of a surfactant is unfavorable.

[0010]

[Problems to be Solved by the Invention] Under these circumstances,
When packing powdered or flaky foods, powdered or granular chemicals, etc. without using various harmful surfactant-type antistatic agents, static electricity is not generated when filling the contents. Suppressing and good sealing properties A packaging material with an excellent appearance that does not cause migration of antistatic agents to foods and chemicals, and also suppresses the generation of static electricity when filling contents when packaging electronic parts etc. At the same time, there is a demand for a packaging material having an excellent appearance that does not cause contamination of electronic parts due to the attachment of an antistatic agent.

An object of the present invention is to provide a sealant film and a laminate film which are excellent in antistatic property and whitening resistance, and a packaging bag which is excellent in antistatic property and whitening resistance using the sealant film or laminate film. is there.

[0012]

The present invention has at least a support layer mainly composed of a polyolefin resin and a heat seal layer mainly composed of a polyolefin resin formed on the support layer. The saturation electrification voltage of the layer surface is 500 V or less, and the half-life of the saturation electrification voltage is 30.
The sealant film is characterized by being less than a second.

The present invention provides the sealant film as described above, wherein the heat-sealing layer contains an ionomer resin, and the ionomer resin contains at least one metal ion selected from lithium, potassium, rubidium and cesium as a metal ion. is there.

The present invention is the above sealant film, wherein the ionomer resin is contained in the heat seal layer in a blending ratio of 50% by weight or more.

Further, the present invention is a laminate film comprising a base material layer laminated on the surface of the support layer of any one of the above-mentioned support layers opposite to the surface on which the heat seal layer is formed. .

Further, the present invention is a packaging bag formed by using any one of the above sealant films or the above laminated films.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an example of the sealant film of the present invention. FIG. 2 is a cross-sectional view showing another example of the sealant film of the present invention. Figure 3
FIG. 3 is a cross-sectional view showing an example of the laminated film of the present invention. FIG. 4 is a cross-sectional view showing another example of the laminated film of the present invention.

In the sealant film of FIG. 1, a heat seal layer (2) mainly composed of a polyolefin resin is formed on a support layer (1) mainly composed of a polyolefin resin.

In the present invention, as the polyolefin resin, a propylene homopolymer, propylene and a carbon number of 2 are used.
To a copolymer with at least one of 12 (excluding carbon number 3), for example, propylene-ethylene copolymer, propylene-butene copolymer, propylene-ethylene block copolymer, propylene-butene block copolymer, Propylene-based resins such as propylene-ethylene-butene copolymer, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, ethylene- Examples thereof include ethylene-based resins such as acrylic acid copolymers and ethylene-methacrylic acid copolymers. One kind selected from these may be used, or a mixture of two or more kinds may be used. Ethylene resin is preferably selected.

In the present invention, the heat seal layer (2)
Surface saturation electrification voltage is 500V or less, preferably 300V
Hereafter, it is more preferably 200 V or less, and the half-life of the saturation electrification voltage is 30 seconds or less, preferably 20 seconds or less, more preferably 10 seconds or less. In the present specification, the saturation electrification voltage is a voltage of 10 kV for 1 minute under an environment of 23 ° C. and a relative humidity of 50%, and the heat seal layer (2)
It is the electrification voltage when applied to the surface, and the half-life of the saturation electrification voltage is the time required for the saturation electrification voltage to be half after the application is stopped.

When the saturation voltage exceeds 500 V and /
Or, when the half-life exceeds 30 seconds, the amount of charge on the surface of the film heat seal layer (2) and / or the amount of remaining charge is too large, and therefore the contents adhered to the seal portion when sealing the contents. There is a high possibility that it will be sealed as it is. As a result, poor adhesion and poor appearance inside the package will occur. Further, when the content is an electronic material or the like, the value of the content itself may be impaired. When the saturation electrification voltage is 500 V or less and the half-life of the saturation electrification voltage is 30 seconds or less, good sealing can be performed without causing such an adverse effect.

In the present invention, the heat seal layer (2) is
It is a layer containing an ionomer resin as a polyolefin-based resin, and it is preferable that the ionomer resin contains at least one metal ion selected from lithium, potassium, rubidium and cesium as a metal ion. By including such an ionomer resin, the non-charging property of the polyolefin resin is improved, and the saturated electrification voltage of the surface of the heat seal layer (2) is 500V.
Hereinafter, the half-life of the saturated charge voltage of 30 seconds or less is likely to be achieved. Considering non-chargeability and economical efficiency, it is most preferable to use potassium alone as the metal ion of the ionomer resin.

The ionomer resin is not particularly limited, but examples thereof include ethylene-methacrylic acid copolymer ionomers, ethylene-acrylic acid copolymer ionomers, propylene-methacrylic acid copolymer ionomers,
Examples thereof include a propylene-acrylic acid copolymer ionomer and a butylene-acrylic acid copolymer ionomer.
One of these ionomer resins may be used, or two or more thereof may be mixed and used as necessary. Among these ionomer resins, ethylene-methacrylic acid copolymer ionomers and ethylene-acrylic acid copolymer ionomers are preferably used.

Further, the compounding ratio of the ionomer resin in the heat seal layer (2) is 50% by weight or more, preferably 70% by weight.
It is at least wt%, more preferably at least 80 wt%. The balance uses the above-mentioned polyolefin resin. When the blending ratio of the ionomer resin is 50% by weight or more, the effect of improving the antistatic property of the polyolefin resin is large, which is preferable. When the blending ratio is less than 50% by weight, the effect of improving the antistatic property is small and the heat seal layer which is a requirement of the present invention.
(2) The surface saturation band voltage of 500 V or less and the half-life of the saturation band voltage of 30 seconds or less may not be achieved in some cases, which is not preferable.

The above-mentioned polyolefin resin is used for the support layer (1). The support layer (1) may be a single layer as shown in FIG. 1 or may be a laminate of a plurality of layers. For example, in FIG. 2, the support layer (1) is composed of two layers, that is, an inner surface layer (1b) on the heat seal layer (2) side and a surface layer (1a) on the opposite side of the heat seal layer (2). An example is shown. In this case, inner layer (1b) and surface layer (1a)
It suffices that a polyolefin resin is used for the above, and it is not always necessary to match the resins of both layers.

An antiblocking agent may be used in the support layer and / or heat seal layer of the sealant film of the present invention. The anti-blocking agent is not particularly limited, but inorganic and / or organic fine particles are preferable. Specifically, examples of the inorganic fine particles include fine particles of silica, zeolite, diatomaceous earth, talc, kaolinite, amorphous aluminosilicate, and the like. or,
Examples of the organic particles include particles made of polymers that are not substantially deformed, such as polymethyl methacrylate, polystyrene and polyamide obtained by emulsion polymerization or suspension polymerization. Inorganic fine particle type silica, zeolite, and diatomaceous earth are preferable in view of the fact that even if added as an anti-blocking agent, the slipperiness is eventually affected, and the transparency and cost of the film are improved. The average particle size of the anti-blocking agent is not particularly limited, but in view of slipperiness, appearance, transparency and blocking resistance, it is preferably about 1 to 15 μm, more preferably 2 to 10 μm.

The amount of the anti-blocking agent used is not particularly limited, and the anti-blocking agent can be freely used as long as it does not impair the slipperiness, appearance, transparency and blocking resistance. For example, in each of the support layer (1) and the heat seal layer (2), the amount is usually 3 parts by weight or less, preferably 2 parts by weight or less, based on 100 parts by weight of the polyolefin resin.

The compounding method of the anti-blocking agent in the sealant film of the present invention is also a masterbatch method.
A pellet blend method immediately before film formation is also possible and is not particularly limited.

A slip agent can also be used in the support layer and / or the heat seal layer of the sealant film of the present invention. As the slip agent, known ones can be used and are not particularly limited, and examples thereof include liquid paraffin and
Hydrocarbon slip agents such as polyethylene wax, metal soap slip agents such as calcium stearate and magnesium stearate, amide slip agents such as oleic acid amide, erucic acid amide, behenic acid amide, ethylene bis oleic acid amide, ethylene bis Examples thereof include erucic acid amide.

The amount of the slip agent used is not particularly limited, and the slip agent can be freely used as long as it does not impair the slipperiness of the film immediately after film formation, the laminate strength after lamination, and the transparency. For example, support layer (1), heat seal layer
(2) In each layer, usually 0.5 parts by weight or less is preferable, and 0.3 parts by weight or less is more preferable, relative to 100 parts by weight of the polyolefin resin.

The method of blending the slip agent into the sealant film of the present invention may be either a master batch system or a pellet blend system immediately before film formation, and is not particularly limited.

The sealant film of the present invention also comprises
If necessary, known additives such as a stabilizer, an antioxidant, an antifogging agent, a plasticizer, and a colorant may be blended in appropriate amounts as long as the effects of the present invention are not impaired.

The method of molding the sealant film of the present invention is not particularly limited, and examples include support layers.
By using the resin composition for each layer of (1) and the heat seal layer (2), it is possible to use an inflation extrusion molding method, a T-die extrusion molding method, or the like.

For example, first, each component of the resin composition for each layer of the support layer (1) and the heat-sealing layer (2) is mixed in a predetermined composition ratio, and the mixture is supplied to each melt extruder and heated at 210 to 280 ° C. Melt extruded at a temperature, passed through a filtration filter, molded into a sheet from a die, wound around a metal drum adjusted to 20 to 80 ° C., cooled and solidified, and adjusted the speed of the metal drum,
A sealant film having an arbitrary thickness is obtained.

The thickness of the sealant film of the present invention is appropriately selected according to the intended use and is not particularly limited, but generally 10 to 200 μm is preferable, and 2
0 to 150 μm is more preferable. Regarding the thickness of each layer of the support layer (1) and the heat seal layer (2), the heat seal layer is in a range satisfying the thickness of the sealant film.
The thickness of (2) is preferably 1 to 120 μm, and 2 to 80 μm.
Is more preferable. The thickness of the support layer (1) is preferably 1 to 120 μm, more preferably 2 to 80 μm.

Regarding the thickness ratio of the heat seal layer (2) and the support layer (1), the thickness of the support layer (1) is preferably 1 or more and 10 or less with respect to 1 of the thickness of the heat seal layer (2). Above 5
The following is more preferable. Support layer (1) Thickness is heat seal layer
(2) If the thickness is greater than 10, the heat seal layer
Since the thickness of (2) becomes thin, it tends to be difficult to obtain good heat sealability.

In particular, when the support layer (1) is composed of a plurality of layers of two or more layers, for example, when the support layer (1) is composed of two layers, the thickness ratio is taken into consideration in view of film-forming property, film physical property and film performance. It is preferable that the heat seal layer (2) / the inner surface layer (1b) of the support layer / the surface layer (1a) of the support layer be about 1/2/1 to 1/9/1.

The heat-sealable laminate film of the present invention comprises a base material layer on the surface of the sealant film opposite to the surface on which the heat-seal layer (2) of the support layer (1) is formed.
(3) is laminated. FIG. 3 shows an example in which a base material layer (3) is laminated on the sealant film of FIG. FIG. 4 shows the base material layer (3) on the sealant film of FIG.
Are shown stacked.

As the base material layer (3), for example, a biaxially stretched film such as a biaxially stretched polypropylene film, a biaxially stretched polyester film, a biaxially stretched nylon film, or a metal evaporated biaxially stretched film is typical. Can be mentioned. The laminating method may be a known method,
Examples thereof include a dry lamination method and an extrusion lamination method. In addition, in order to obtain high adhesion strength between the base material layer (3) and the support layer (1) of the sealant film, the surface of the base material layer (3) to be brought into contact with the support layer (1) has a surface such as corona treated surface. Processing may be performed. Further, the surface of the support layer (1) of the sealant film may be subjected to surface treatment such as corona treatment. The thickness of the base material layer (3) is appropriately selected according to the intended use and is not particularly limited, but generally 2
˜100 μm is preferable, and 5˜50 μm is more preferable.

The sealant film and the laminate film of the present invention are suppressed in the heat-sealing layer (2) from being electrified, are less likely to generate static electricity, and have excellent whitening resistance over time, and are particularly suitable for packaging foods, chemicals, electronic parts, etc. It is suitable as a material. The sealant film and the laminate film of the present invention have a print layer for design, display, inspection, etc. for use as a packaging material, such as a support layer (1) and a base material layer.
It may further have between (3) and outside the base material layer (3).

The packaging bag of the present invention is formed in various forms using the sealant film of the present invention or the laminate film of the present invention. That is, the packaging bag of the present invention,
Heat seal layer (2) of the sealant film of the present invention is heat-sealed to each other, or heat seal layer (2) of the laminate film of the present invention is heat sealed to each other, or heat seal of the sealant film of the present invention It can be obtained by heat-sealing the layer (2) side and the heat-sealing layer (2) side of the laminate film of the present invention. Alternatively, the packaging bag of the present invention, the heat seal layer (2) surface of the sealant film of the present invention or the heat seal layer (2) surface of the laminate film of the present invention, and the heat of the surface of the molded product such as another film or sheet. It can be obtained by heat-sealing with the surface of the heat-sealing layer made of the plastic resin composition.

As the form of the packaging bag, any form such as a pillow packaging bag, a three-sided sealing bag, a four-sided sealing bag, etc. can be selected according to the purpose. The packaging bag may be manufactured by a known method, for example, a method using a simple manual sealer,
Examples include a method using a three-way seal and a fusing seal bag-making machine.

In the packaging bag of the present invention, since the inner surface of the bag is the heat-sealing layer (2) of the sealant film and / or the laminated film of the present invention, the inner surface of the bag is suppressed from being charged and static electricity is hardly generated, and It has excellent whitening resistance over time, and is particularly suitable as a packaging bag for foods, chemicals, electronic parts, and the like.

[0044]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples, and various modifications may be made without departing from the scope of the present invention. It is also possible to carry out. Modifications belonging to the equivalent range of the claims are included in the technical scope of the present invention. The characteristic values and evaluations used in the present invention are based on the following measuring methods.

(1) Saturation electrification voltage (V) and half-life (second) After leaving the sealant film or laminate film in a constant temperature chamber at 40 ° C. for 1 month, it was stored in an environment of 23 ° C. and 50% relative humidity. Using a Stooch Honest meter manufactured by Anato Shokai, 10 seconds after the start of rotation of the turntable, 1 minute, a voltage of 10 kV was applied to the heat seal layer (2) surface of the sample. The voltage was defined as the voltage, and the half-life was defined as the time required for the application to be stopped and the saturation charging voltage to be halved. Saturation voltage measurement limit: minimum 10V Half-life measurement limit: minimum 1 second, maximum 120 seconds

(2) The whitening resistant sealant film was left in a constant temperature room at 40 ° C. for 1 month. The haze value after standing and the haze value at the start of storage were measured with an NDH-300A muddy color meter (cloudiness meter) manufactured by Nippon Denshoku Industries Co., Ltd., respectively. The increase in haze value at this time was used as an index of whitening resistance. The smaller the haze value rises, the better the whitening resistance. Increase in haze value (%) = haze value after standing (%)-haze value at the start of storage (%)

(3) Laminate Strength A biaxially stretched polyester film (E5100, manufactured by Toyobo Co., Ltd., thickness: 12 μm) as a base material layer has an ether adhesive (TM-329 / manufactured by Toyo Morton Co., Ltd.) on the corona-treated surface.
CAT-8B = 50/50% by weight) was applied at 2.5 g / m ² and then the adhesive application surface and the support layer surface of the sealant film were bonded together to obtain a laminated film. afterwards,
After leaving the laminated film in a constant temperature room at 40 ° C for 1 month,
A sample was cut out with a width of 15 mm in the machine flow direction, and the peel strength at the laminate interface was measured at a pulling speed of 200 mm / min.

(4) Presence or absence of powder adhesion The heat seal layer surfaces of the laminated film were sealed with a test sealer manufactured by Tester Sangyo Co., Ltd. at a sealing pressure of 0.
Heat sealing was performed at 3 MPa, a sealing time of 2 seconds, and a sealing temperature of 130 ° C. to obtain a three-side sealed bag having a size of 15 cm in the machine flow direction and 10 cm in the machine vertical direction. After transferring 5 g of a commercially available scraper to this bag in an environment of 23 ° C. and a relative humidity of 50%, the heat-sealing layer surfaces of the open ends were heat-sealed to obtain a four-side sealed bag. The four-sided sealed bag was shaken up and down, left and right, and the state of attachment of shavings inside the bag was visually evaluated. ◯: No powder adhered to the entire sealant surface (inner surface of the bag). Δ: A small amount of powder adhered on the sealant surface (inner surface of the bag). X: Powder adheres to the entire sealant surface (inner surface of the bag).

Example 1 A sealant film having the layer structure shown in FIG. 1 was prepared. Linear low-density polyethylene (Ube Industries, Yumerit 4040F) for the support layer (1)
C), using an ionomer having a metal ion of potassium for the heat seal layer (2) (HIMIRAN MK153, manufactured by Mitsui DuPont Polychemical Co., Ltd.), and melting each polymer composition using a separate screw type extruder. And supply it to the multi-manifold multilayer T-die at 250 ° C.
Coextruded at the temperature of, the extruded film is wound around a metal drum, cooled and solidified, and heat seal layer (2) / support layer
Thickness ratio of (1) = 10/40 (μm / μm), total thickness 50μ
m of sealant film was obtained. Table 1 shows the results of the saturation electrification voltage (V), half-life (seconds) and whitening resistance of the obtained sealant film.

[Example 2] A sealant film having a layer structure having two supporting layers shown in Fig. 2 was prepared. Linear low-density polyethylene (Ube Industries, Ltd., Yumerit 4040FC) for the surface layer (1a) of the support layer, the inner surface layer (1) of the support layer
b) Linear low-density polyethylene for use (made by Ube Industries,
Yumerit 2040F) and an ionomer (Himilan MK153, manufactured by Mitsui DuPont Polychemical Co., Ltd.) in which the metal ion is potassium for the heat seal layer (2) and the heat seal layer (2) /
Thickness ratio of inner layer (1b) of support layer / surface layer (1a) of support layer = 1
A sealant film having a thickness of 0/30/10 (μm / μm / μm) and a total thickness of 50 μm was obtained. Table 1 shows the results of the saturation electrification voltage (V), half-life (seconds) and whitening resistance of the obtained sealant film.

[Example 3] Ionomer (Himilan MK153, manufactured by Mitsui-DuPont Polychemical Co., Ltd.) 85 whose metal ion is potassium for the heat-sealing layer (2) 85
% By weight and linear low density polyethylene (manufactured by Ube Industries,
Yumerit 2040F) Heat seal layer was prepared in the same manner as in Example 2 except that 15% by weight of the polymer composition was used.
(2) / thickness ratio of support layer inner surface layer (1b) / support layer surface layer (1a) = 10/30/10 (μm / μm / μm), total thickness 50
A μm sealant film was obtained. Table 1 shows the results of the saturation electrification voltage (V), half-life (seconds) and whitening resistance of the obtained sealant film.

[Comparative Example 1] Linear low-density polyethylene (manufactured by Ube Industries, Ltd., Yumerit 2 for a heat-sealing layer)
040F) 98.0% by weight, 1.0% by weight of silica having an average particle size of 4 μm, and a surfactant (monoglycerin monostearate / diglycerin monostearate = 20/80).
(Weight ratio) 1.0% by weight was used in the composition, linear low-density polyethylene (manufactured by Ube Industries, Ltd., Yumerit 4040FC) was used as the surface layer of the supporting layer, and linear chain was used as the inner surface layer of the supporting layer. Low density polyethylene (manufactured by Ube Industries, Umerit 2040F) 99.0% by weight and surfactant (monoglycerin monostearate / diglycerin monostearate = 20/80 (weight ratio)) 1.0% by weight The thickness ratio of heat-sealing layer / inner layer of support layer / surface layer of support layer = 10/30/10 (μm / μm / μ) in the same manner as in Example 2 except that the above composition was used.
m), a sealant film having a total thickness of 50 μm was obtained. Table 1 shows the results of the saturation electrification voltage (V), half-life (seconds) and whitening resistance of the obtained sealant film.

[Comparative Example 2] 15% by weight of ionomer (Mitsui DuPont Polychemical Co., Ltd., Himiran MK153) having a metal ion of potassium for the heat-sealing layer and linear low-density polyethylene (Ube Industries Co., Ltd., Yumerit 2040F) ) In the same manner as in Example 2 except that 85% by weight of the polymer composition was used, the thickness ratio of heat seal layer / inner layer of support layer / surface layer of support layer = 10/30 /
A sealant film having a thickness of 10 (μm / μm / μm) and a total thickness of 50 μm was obtained. Table 1 shows the results of the saturation electrification voltage (V), half-life (seconds) and whitening resistance of the obtained sealant film.

Example 4 An ether adhesive (manufactured by Toyo Morton, TM-329, manufactured by Toyo Morton Co., Ltd.) was applied to the corona-treated surface of a biaxially stretched polyester film (E5100, manufactured by Toyobo Co., Ltd., thickness 12 μm) as the base material layer (3). / CAT-8B = 50/5
0% by weight) at 2.5 g / m ² and then the adhesive-coated surface and the surface layer (1a) of the support layer of the sealant film obtained in Example 2 are laminated together to form the layer shown in FIG. A laminated film having a constitution was prepared. Table 2 shows the results of the saturation electrification voltage (V), the half-life (second) and the lamination strength of the obtained laminate film. In addition, Table 2 shows the results of the presence / absence of powder adhering to the four-sided sealing packaging bag prepared by heat-sealing the heat-sealing layer (2) sides of the obtained laminated film.

[Example 5, Comparative Examples 3 and 4] Using the sealant film obtained in Example 3 (Example 5) and the sealant film obtained in Comparative Example 1 (Comparative Example 3), Alternatively, using the sealant film obtained in Comparative Example 2 (Comparative Example 3), laminate films were prepared in the same manner as in Example 4. Table 2 shows the results of the saturation electrification voltage (V), the half-life (second) and the lamination strength of the obtained laminate film. In addition, Table 2 shows the results of the presence / absence of powder adhering to the four-sided sealing packaging bag prepared by heat-sealing the heat-sealing layer (2) sides of the obtained laminated film.

[0056]

[Table 1]

[0057]

[Table 2]

From Table 1, in the sealant films of Examples 1 to 3, the saturation charge voltage (V) and the half-life (second) of the heat-sealing layer conformed to the present invention, the charging was suppressed, and the whitening resistance with time was increased. Was also excellent. On the other hand, in the film of Comparative Example 1, a surfactant was used as an antistatic agent in the heat-sealing layer, but the antistatic property was insufficient, and whitening due to the surfactant was observed over time. In the film of Comparative Example 2, an ionomer was used for the heat seal layer, but the amount of the ionomer was small, so that the saturated electrification voltage (V) and the half life (second) of the heat seal layer did not conform to the present invention.

From Table 2, the laminated films of Examples 4 to 5 were suppressed from being charged and the laminate strength was practically sufficient. The packaging bag obtained from these did not cause powder adhesion to the entire inner surface of the bag, and was particularly suitable for food and chemical applications. The laminated film of Comparative Example 3 had insufficient antistatic properties, and a small amount of powder adhered to the inner surface of the bag in the packaging bag obtained therefrom. The laminate film of Comparative Example 4 had insufficient antistatic properties, and the packaging bag obtained therefrom had powder adhesion on the entire inner surface of the bag.

[0060]

EFFECTS OF THE INVENTION According to the present invention, a sealant film and a laminate film having excellent antistatic property and anti-whitening property, in particular, foods, chemicals, and electronic products, without using a surfactant type antistatic agent having various harmful effects. Provided are a sealant film and a laminate film having an antistatic property suitable as a packaging material for parts and the like.

According to the packaging bag made of the sealant film and / or the laminated film of the present invention, the contents are filled when packaging foods in the form of powder or granules, chemicals in powder or granules, etc. Occasionally, the generation of static electricity is suppressed and a good sealing property can be obtained, and there is no concern about migration of the antistatic agent to foods or chemicals. Further, when packaging electronic components and the like, generation of static electricity is suppressed during filling of contents, and there is no concern about contamination of electronic components due to adhesion of antistatic agent.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a sealant film of the present invention.

FIG. 2 is a cross-sectional view showing another example of the sealant film of the present invention.

FIG. 3 is a cross-sectional view showing an example of the laminated film of the present invention.

FIG. 4 is a cross-sectional view showing another example of the laminated film of the present invention.

[Explanation of symbols]

(1): Support layer (1a): Surface layer of support layer (1) (1b): Inner surface layer of support layer (1) (2): Heat seal layer (3): Base material layer

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3E064 BA16 BA24 BB03 BC18 HN05                 3E086 AA23 AB01 AC07 AC22 AD01                       BA04 BA15 BA33 BB22 BB35                       BB51 BB52 CA01 CA28 CA31                       DA01                 4F100 AK03A AK03B AK70B AT00C                       BA02 BA03 BA07 BA10B                       BA10C GB15 JG03B JG10B                       JL12B YY00B

Claims (5)

[Claims] 1. A support layer containing a polyolefin resin as a main component, and a heat-sealing layer containing a polyolefin resin as a main component formed on the support layer. At least a saturation electrification voltage on the surface of the heat-sealing layer is 500 V. The sealant film has the following half-life and a half-life of the saturated electrification voltage of 30 seconds or less. 2. The sealant according to claim 1, wherein the heat seal layer contains an ionomer resin, and the ionomer resin contains, as metal ions, at least one metal ion selected from lithium, potassium, rubidium and cesium. the film. 3. The sealant film according to claim 1, wherein the ionomer resin is contained in the heat seal layer in a blending ratio of 50% by weight or more. 4. A base material layer is laminated on the surface of the support layer of the sealant film according to claim 1 opposite to the surface on which the heat seal layer is formed. Laminate film. 5. A packaging bag formed using the sealant film according to any one of claims 1 to 3 or the laminate film according to claim 4.