JPH08104369A - Packaging bag and packaging container - Google Patents

Abstract

PURPOSE: To obtain an inner packaging bag and a packaging container free from bad smell and having improved durability by the use of a laminated film containing no anchor coat agent, wherein an ozonized, extruded laminate resin is pressed on a plastic base material to which a specific surface oxidation treatment has been applied. CONSTITUTION: A surface oxidation treatment is applied to at least one surface of a plastic base material and an ozonization treatment is applied to at least one surface of a film prepared by melt-extruding an extruded laminate resin at a temperature of 180-340 deg.C and both the material and film are compressively bonded to each other to form a packaging film or sheet containing no anchor coat agent, wherein a surface treatment is effected so that the relationship Δ(OC)>=0.08 is established when the plastic base material is a polyester resin and the relationship Δ(O/C)>=0.05 when the base material is other than a polyester resin. However, Δ(O/C)=(O/C)*-(O/C) deg., where (O/C) deg. represents the ratio of number of atoms between O and C measured by ESCA method with respect to a surface to which a surface oxidation treatment has not been applied, and (O/C)* represents the ratio of number of atoms of a surface to which a surface oxidation treatment has been applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag or packaging container made of a specific packaging laminated film or packaging laminated sheet.

[0002]

2. Description of the Related Art Film-like molded products made of different materials such as plastic, paper and metal foil are stuck together to supplement properties which cannot be obtained by themselves, such as strength, gas barrier property, moisture proof property, heat seal property and appearance. It is common practice to produce such laminated films or sheets, and the products thus obtained are widely used mainly for packaging materials and the like. As a method for producing such a laminated film or laminated sheet, there are a dry lamination method, a wet lamination method, a hot lamination method, an extrusion lamination method, a coextrusion lamination method and the like, and these are applied according to their characteristics. . For packaging materials,
As a method for forming a heat seal layer on a substrate, an extrusion lamination method, which is advantageous in terms of cost, is widely used. As the heat seal layer, a polyolefin resin such as polyethylene, polypropylene, an ethylene copolymer, or an ionomer resin is generally used, but a polyolefin resin is used in a much larger amount from the viewpoint of cost. ing.

[0003]

In order to promote adhesion to a substrate, these resins are preliminarily coated with an anchor coating agent on the substrate and then melt-extruded on the surface to be adhered to the substrate. It is common to As an anchor coat agent,
Adhesives such as organic titanate-based, organic isocyanate-based, and polyethyleneimine-based adhesives are used. These adhesives are usually diluted with an organic solvent such as toluene, ethyl acetate, methanol or hexane before use. However, these methods using the anchor coating agent, the problem of increasing the manufacturing cost due to the use of expensive anchor coating agent, the problem of requiring a complicated step of coating and drying the anchor coating agent, the anchor coating agent The organic solvent that is harmful to the human body is scattered during the evaporation and drying process of the organic solvent contained in the product, resulting in hygiene problems in the work environment and the surrounding environment, and the problem of fire caused by the use of flammable organic solvents, organic solvents, etc. Anchor coat agent component of is left on the film or sheet, and due to the odor caused by it, there is a problem that the application of the film or sheet to food packaging applications, pharmaceutical / medical product packaging applications, cosmetic packaging applications, etc. is restricted. Have.

Further, as a method without using these anchor coating agents, (a) ethylene, (b) unsaturated polybasic acid, (c) acrylic acid lower alkyl ester, methacrylic acid lower alkyl ester and vinyl ester are selected. The ethylene-based copolymer obtained by copolymerizing the obtained unsaturated monomer is melt-kneaded and extruded into a film at a temperature of 150 ° C to 330 ° C, and then the film is ozone-treated, and then this ozone-treated It has been reported that a laminate is produced by pressure-bonding and laminating to a base material with the surface as an adhesive surface (Japanese Patent Laid-Open No. Hei 4-
368845). However, in the method of using an ethylene-based copolymer that has an adhesive function using these unsaturated polybasic acids as comonomer components, roll release during extrusion lamination processing is accompanied by an increase in the manufacturing cost and low melting point components. Inferior in properties, not only restricted by processing temperature and the like, but also complicated such as resin change in the extruder, which is not preferable.

Further, the ethylene-α-olefin copolymer is subjected to ozone treatment on the adhesive surface to the base material by using a known ozone treatment device, and pressure-bonded and laminated on the base material without applying an anchor coating agent. The method of manufacturing the body, or using an adhesive resin that is graft-modified with a polyolefin resin such as unsaturated carboxylic acid, combined with a co-extrusion laminating machine, pressure-bonded to the base material with no anchor to produce a laminated body. A method of doing so has been reported (Convertec (8), p. 36, 1991). However, the adhesive strength between the laminate resin and the base material of the laminate obtained by these methods is not sufficient, and its application range is restricted. Furthermore, in the method of using an adhesive resin obtained by graft-modifying an unsaturated carboxylic acid or the like on a polyolefin-based resin, not only the coextrusion apparatus is required and the manufacturing cost is increased, but also
It is not preferable due to the complexity of changing the resin in the extruder.

[0006]

In view of the present situation, the inventors of the present invention have earnestly studied a packaging bag or a container made of a laminated film for packaging or a laminated sheet for packaging that does not use an anchor coating agent. Film and a laminated film composed of a polyethylene resin, a polypropylene resin, an ethylene-vinyl ester copolymer resin and an ethylene- (meth) acrylic acid ester copolymer resin, which is one kind selected from the group consisting of resins Or a laminated sheet, a laminated film for packaging produced from a specific surface oxidation treatment step, an ozone treatment step and a pressure-bonding step without using an anchor coating agent that causes many problems in odor generation and productivity, or The present invention has been completed by finding a packaging bag or packaging container made of a laminated sheet for packaging.

That is, the present invention provides a packaging bag or packaging container comprising the following laminated film for packaging or laminated sheet for packaging. From a plastic substrate and a resin for extrusion lamination, which is one selected from the group consisting of polyethylene resins, polypropylene resins, ethylene-vinyl ester copolymer resins and ethylene- (meth) acrylic acid ester copolymer resins A laminated film for packaging or a laminated sheet for packaging, which comprises the following surface oxidation treatment step, ozone treatment step and pressure-bonding step and does not use an anchor coating agent. Surface oxidation treatment step: a step of subjecting at least one surface of a plastic substrate to a surface oxidation treatment. Ozone treatment process: 180-34 resin for extrusion lamination
A step of melt-extruding into a film at a temperature of 0 ° C. and subjecting at least one surface of the film to ozone treatment. Pressure-bonding step: a step of bringing the surface-oxidized surface of the plastic substrate obtained in the surface-oxidation treatment step into contact with the ozone-treated surface of the film obtained in the ozone-treatment step to pressure-bond the film and the plastic substrate. Then, the step of forming the relationship represented by the following formula for the surface oxidation-treated surface of the plastic base material subjected to pressure bonding. (1) When the plastic substrate is a polyester resin Δ (O / C) ≧ 0.08 (2) When the plastic substrate is other than the polyester resin Δ (O / C) ≧ 0.05 where Δ (O / C) = (O / C) ^* − (O / C) ⁰ , where (O / C) ⁰ is oxygen measured by the ESCA method on the surface of the plastic substrate that has not been surface-oxidized. Represents the ratio of each atom number of atoms and carbon atoms,
(O / C) ^* represents the ratio of the number of oxygen atoms to the number of carbon atoms measured by the ESCA method on the surface of the plastic substrate that has been subjected to the surface oxidation treatment of the present invention.

The present invention also provides a packaging bag or packaging container,
The present invention provides a packaging bag or packaging container that is a food packaging bag or packaging container. The present invention provides a packaging bag or packaging container in which the packaging bag or packaging container is a medicine, medical product packaging bag or medicine, medical product packaging container. The present invention provides a packaging bag or packaging container in which the packaging bag or packaging container is a cosmetic packaging bag or a cosmetic packaging container. The present invention provides a packaging bag or a packaging container used for a dried product. The present invention
The packaging bag or the packaging container provides the packaging bag or the packaging container used for a liquid substance or a wet substance. Hereinafter, the present invention will be described in detail.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Examples of the plastic substrate used in the present invention include nylon resins, polyester resins, ethylene-vinyl alcohol copolymers, polyvinyl alcohol, polypropylene resins, polyethylene resins, ethylene copolymers. , Ionomer resin, cellophane, polyvinylidene chloride, polystyrene, polyvinyl chloride, polycarbonate, polymethylmethacrylate, polyurethane, fluororesin, polyacrylonitrile, polybutene resin, polyimide resin, polyarylate resin, acetylcellulose, and other such resins alone and these Laminated films or sheets, and further stretched products, coated products, woven fabrics, non-woven fabrics and the like are used. Further, a bonded product of these plastic base materials with aluminum, iron, paper, etc.,
A laminate or the like in which these resins are provided on the joint surface is used.
Printing may be previously performed on these plastic substrates. The thickness of the base material is not particularly limited as long as extrusion lamination processing is possible, but preferably 1 to 10
The range is 000 μm, more preferably 5 to 500 μm.

Examples of the resin for extrusion lamination used in the present invention include polyethylene resins, polypropylene resins, ethylene-vinyl ester copolymer resins and ethylene-based resins.
It is one kind selected from the group consisting of (meth) acrylic acid ester-based copolymer resins, and these can be used alone or as a mixture of two or more kinds. If necessary,
Other resins may be mixed in the range of less than 50% by weight.

The production method of the polyethylene resin is not limited, and it can be produced by, for example, a radical polymerization method or an ionic polymerization method. As a polyethylene resin,
Examples include low-density polyethylene produced by radical polymerization, high-density polyethylene produced by ionic polymerization, and ethylene-α-olefin copolymers obtained by copolymerizing ethylene and α-olefin. To be
Examples of the α-olefin include propylene and butene-
1,4-methylpentene-1, hexene-1, octene-1, decene-1, octadecene-1 and the like having 3 to 3 carbon atoms
18 α-olefins are used, and these α-olefins can be used alone or in combination of two or more. The content of the α-olefin contained in the ethylene-α-olefin copolymer is preferably 1 to 30% by weight, more preferably 5 to 20% by weight.

The method for producing the polypropylene resin is not limited, and it can be produced by, for example, an ionic polymerization method. Examples of the polypropylene resin include a homopolymer of propylene, a copolymer of propylene and α-olefin such as a copolymer of propylene and ethylene, and a copolymer of propylene and butene-1. The α-olefin copolymerized with propylene is
One kind or two or more kinds can be used. Propylene-
The content of the α-olefin contained in the α-olefin copolymer is preferably 0.1 to 40% by weight, more preferably 1 to 30% by weight.

The ethylene-vinyl ester copolymer resin and the ethylene- (meth) acrylic acid ester copolymer resin can be produced by a radical polymerization method, and are obtained by copolymerizing ethylene and a radically polymerizable monomer. To be

Examples of the vinyl ester of the ethylene-vinyl ester copolymer include vinyl acetate, vinyl propionate and vinyl neoate.

Examples of the (meth) acrylic acid ester of the ethylene- (meth) acrylic acid ester type copolymer include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate and n-acrylic acid.
-Acrylic acid esters such as butyl, t-butyl acrylate, isobutyl acrylate, methyl methacrylate,
Methacrylic acid esters such as ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, and isobutyl methacrylate, which are unsaturated carboxylic acid esters having 4 to 8 carbon atoms, Can be mentioned. These comonomers may be used alone or in combination of two or more.

The content of the comonomer component contained in the ethylene-vinyl ester copolymer and the ethylene- (meth) acrylic acid ester copolymer is preferably 30% by weight or less, more preferably 20% by weight or less. Is good.

From the standpoint of processability, the melt flow rate (M) at 190 ° C. for polyethylene resin, ethylene-vinyl ester copolymer resin and ethylene- (meth) acrylic acid ester copolymer resin.
FR) is preferably in the range of 1 to 100 g / 10 minutes, and for polypropylene resins, 230 ° C.
It is preferable that the MFR in is in the range of 1 to 100 g / 10 minutes.

In the surface oxidation treatment step of the present invention, at least one surface of the plastic base material is subjected to a surface oxidation treatment to generate oxidation activation points at a certain level or higher on the adhesive surface of the plastic base material, thereby providing a strong adhesion. This is a process that enables it. Here, the oxidation activation point above the certain level is defined by Δ (O / C) described later.

The surface oxidation treatment step is specifically carried out by a corona discharge treatment step, a plasma treatment step, a flame plasma treatment step, an electron beam irradiation treatment step, an ultraviolet ray irradiation treatment step and the like. Details will be described later.

The ozone treatment step of the present invention is a step in which the resin for extrusion lamination is melt-extruded into a film at a temperature of 180 to 340 ° C., and at least one surface of the film is subjected to ozone treatment. The ozone treatment is performed, for example, by blowing a gas (such as air) containing ozone from a nozzle provided in an air gap under the T-die or a slit-shaped blowout port onto the molten film. If the ozone nozzle cannot be installed under the T-die, it may be sprayed onto the plastic substrate immediately before pressure-bonding and laminating.
The amount of ozone sprayed is preferably 1 to 30 mg / m ^2, more preferably ² per unit area of the molten film.
Is about 12 mg / m ² . The temperature at which the resin for extrusion lamination is melt-extruded into a film is 180 to 340.
C., preferably 210 to 330.degree. The temperature is 18
If the temperature is lower than 0 ° C., the spreadability of the resin will be poor, and it will be difficult to obtain a molten thin film having a uniform thickness, and the adhesive strength with the plastic substrate will be insufficient. Meanwhile, 340 ° C
If it exceeds, oxidization of the surface of the molten resin is increased and odor is deteriorated.

In the pressure-bonding step of the present invention, the surface-oxidized surface of the plastic base material obtained in the surface-oxidation treatment step is brought into contact with the ozone-treated surface of the film obtained in the ozone treatment step, and the film and the plastic substrate are brought into contact with each other. This is a step of crimping the material, in which the relationship represented by the following formula is established for the surface oxidation treated surface of the plastic base material subjected to crimping. (1) When the plastic substrate is a polyester resin Δ (O / C) ≧ 0.08 (2) When the plastic substrate is other than a polyester resin Δ (O / C) ≧ 0.05 Further, preferably, The formula is as follows. (1) When the plastic substrate is a polyester resin Δ (O / C) ≧ 0.10 (2) When the plastic substrate is other than the polyester resin Δ (O / C) ≧ 0.07 where Δ (O / C) = (O / C) ^* − (O / C) ⁰ , where (O / C) ⁰ is oxygen measured by the ESCA method on the surface of the plastic substrate that has not been surface-oxidized. Represents the ratio of each atom number of atoms and carbon atoms,
(O / C) ^* represents the ratio of the number of oxygen atoms to the number of carbon atoms measured by the ESCA method on the surface of the plastic substrate that has been subjected to the surface oxidation treatment of the present invention.

The definition of (O / C) ⁰ of the plastic substrate will be described with reference to specific examples. In general, commercially available plastic substrates give adhesiveness to printing inks and adhesives used in the laminating process with other laminating materials. In many cases, the surface oxidation treatment is applied.
For example, in the case of using a plastic base material that has been subjected to surface oxidation treatment on only one side, the surface that has not been subjected to surface oxidation treatment is used as the reference surface of the base material, and oxygen atoms and carbon measured by the ESCA method on this surface are used. Expressed in atomic ratio (O /
Let C) be (O / C) ⁰ of the substrate. Also, when using a plastic substrate with surface oxidation treatment on both sides,
ESCA for a surface of a plastic base material manufactured by the same base material manufacturer as the plastic base material and having the same composition and the same method, at least one surface of which is not subjected to surface oxidation treatment, ESCA Expressed by the ratio of oxygen atoms and carbon atoms measured by the method (O /
Let C) be (O / C) ⁰ of the substrate.

Next, in the case of using a laminate in which the plastic substrate is composed of two or more kinds of different materials (hereinafter referred to as the plastic laminated substrate), (O / C) ⁰ is defined as above. To be done. That is, even in the case of a plastic laminated base material, let us consider the single plastic base material on the surface to which the surface oxidation treatment of the present invention is applied. That is, when the plastic base material is a plastic base material that has been subjected to surface oxidation treatment only on one side, as described above, the surface not subjected to the surface oxidation treatment is used as the reference surface of the base material, and ESCA is applied to this surface. (O / C) represented by the ratio of oxygen atoms and carbon atoms measured by the method becomes (O / C) ^{0 of the} base material. Further, even when both surfaces of the plastic substrate have already been subjected to surface oxidation treatment such as corona discharge treatment, the same substrate manufacturer and the same composition as the plastic substrate are used as described above. The ratio of oxygen atoms to carbon atoms measured by the ESCA method on the surface not subjected to the surface oxidation treatment of the raw material and the one surface which has been subjected to the surface oxidation treatment only on one side was expressed. (O /
C) is (O / C) ^{0 of the} substrate.

As the above-mentioned plastic laminated base material, for example, a resin on the surface of which the surface oxidation treatment of the present invention is applied is formed by a film forming method such as a tenter method or an inflation method. A plastic laminated base material laminated by a dry lamination method or a wet lamination method may be used. Specifically, a dry laminate film of a biaxially oriented polypropylene film and an ethylene-vinyl alcohol copolymer film (hereinafter referred to as OPP / EVOH), a dry laminate film of a biaxially oriented polyester film and a biaxially oriented nylon film ( Hereinafter referred to as PET / ONy.)
Examples include a two-layer plastic laminated base material. Further, as the above plastic laminated base material, for example, in an extrusion lamination processing method, a polyethylene base resin, a polypropylene base resin, a polyolefin base resin such as an ethylene base copolymer, or an ionomer base material is added to the plastic base material fed out from the main feeding. Examples thereof include a plastic laminated base material in which a layer called a glue layer (or an intermediate layer) such as a resin, a polyester resin, a nylon resin or an ethylene-vinyl alcohol copolymer is extrusion laminated. As described above, in the case of a plastic laminated base material having at least two layers in which the resin is laminated on the plastic base material by the extrusion lamination method, the resin surface formed by the extrusion lamination method is considered. That is, the surface of the resin that has not been subjected to the surface oxidation treatment of the present invention serves as a reference surface, and the (O / C) represented by the ratio of oxygen atoms and carbon atoms measured by the ESCA method on this surface is (O / C) of the substrate. O / C) ⁰ . Examples of the plastic laminated base material composed of two layers laminated by such a method include a biaxially stretched nylon film (hereinafter referred to as ONy),
Biaxially oriented polyester film (hereinafter referred to as PET), biaxially oriented polypropylene film (hereinafter referred to as OP
It is called P. ), A biaxially stretched ethylene-vinyl alcohol copolymer film (hereinafter referred to as EVOH), and the like, a polyolefin resin such as a polyethylene resin, a polypropylene resin, or an ethylene copolymer are laminated by an extrusion lamination method. Examples thereof include a plastic laminated base material. Furthermore, as a plastic laminated base material composed of three layers, a plastic laminated base material composed of two layers such as a dry laminated film of OPP and EVOH, a dry laminated film of PET and ONy, a dry laminated film of ONy and EVOH, and a polyethylene type Examples of the plastic laminated base material include a resin, a polypropylene resin, and a polyolefin resin such as an ethylene copolymer that are laminated by an extrusion lamination method.

In the present invention, it is also possible to use a laminate in which a plastic base material and a packaging material other than plastic materials such as paper and aluminum foil are laminated in two or more layers. Examples of such a laminated body include a plastic laminated base material having at least two layers in which a resin is laminated on a paper or aluminum foil base material by an extrusion lamination method. In the case of such a plastic laminated base material, the resin surface formed by the extrusion lamination method is considered as described above. That is, the surface of the resin that has not been subjected to the surface oxidation treatment of the present invention serves as a reference surface, and the (O / C) represented by the ratio of oxygen atoms and carbon atoms measured by the ESCA method on this surface is (O / C) of the substrate. O
/ C) ⁰ . As the plastic laminated base material composed of at least two layers laminated by such a method, for example, a paper base material, a polyethylene resin, a polypropylene resin,
Polyolefin resin such as ethylene copolymer, ionomer resin, ethylene-vinyl alcohol copolymer,
Examples of the plastic laminated base material include nylon-based resin and polyester-based resin laminated by an extrusion lamination method. Further, a plastic laminated base material in which a polyolefin resin such as a polyethylene resin, a polypropylene resin, an ethylene copolymer or an ionomer resin is laminated on an aluminum foil base material by an extrusion lamination method may be mentioned. Further, as a laminate in which a plastic base material other than the extrusion lamination method and a packaging material other than the plastic base material such as paper and aluminum foil are laminated in two or more layers, for example, a dry lamination method or a wet lamination method is used. Examples of the plastic laminated base material include, specifically, a dry laminated film of aluminum foil and biaxially stretched polyester film (hereinafter referred to as AL / P
It is called ET. ) Or a dry laminate film of aluminum foil and biaxially stretched nylon film (hereinafter referred to as AL / O
It is called Ny. ) And the like, which are two-layer plastic laminated base materials. Also in this case, similarly to the above, the surface not subjected to the surface oxidation treatment of the present invention becomes the reference surface of the base material,
(O / C) expressed by the ratio of oxygen atoms and carbon atoms measured by ESCA method on this surface is (O / C) of the substrate.
It becomes ⁰ .

Incidentally, (O / C) ^* is a value measured 30 minutes after the lamination of the resin of the present invention by extrusion lamination.
However, the actual measurement was performed on the surface of a plastic base material on which the resin for extrusion lamination was not prepared, which was subjected to surface oxidation treatment in the same manner as the base material to be adhered.

Here, ESCA is Electron
Spectroscopy for Chemical
Means Analysis, (O / C)^*And (O /
C) ⁰ Is calculated as follows. That is, O_1SAnd C_1Sof
Assign the relative sensitivity of each peak to the area of each peak intensity.
Calculate the abundance ratio of oxygen and carbon (O / C) from the ratio of the digits
(For details, see, for example, "Basics of Polymer Surfaces
(Up) ", Kagaku Dojin, 1986, Chapter 4 Reference
Teru. ).

The change with time of the Δ (O / C) value will be described. Taking the case where the plastic base material is biaxially stretched nylon film and the surface oxidation treatment is corona discharge treatment as an example, △ (O
The change over time of the / C) value is shown in FIG. As is clear from FIG. 1, the Δ (O / C) value sharply decreases with time. For example, when the corona treatment density is 100 (w · min / m ² ), Δ (O / C /) becomes Δ (O / C / C) The value is less than 0.05. When the corona treatment density is 30 (w · min / m ² ),
The degree of surface oxidation treatment is low, and the Δ (O / C) value becomes less than 0.05 after 2 hours from the treatment. Therefore, when the corona treatment density is 30 (w · min / m ² ), sufficient film adhesion strength cannot be obtained unless the corona treatment is performed in-line in the same steps as the ozone treatment step and the pressure bonding step. If the value of Δ (O / C) is too small, sufficient adhesive strength cannot be obtained.

Here, the polyester resin means an aromatic dicarboxylic acid such as terephthalic acid or 2,6-naphthalenedicarboxylic acid and an aliphatic glycol such as ethylene glycol, diethylene glycol or 1,4-cyclohexanedimethanol. It is a resin composed of a polymer obtained by polycondensation. Typical examples of the polymer include polyethylene terephthalate (PET) and polyethylene 2,6-naphthalene dicarboxylate (PE).
N), polybutylene terephthalate (PBT), etc. are illustrated. In addition to the homopolymer, the polymer is 2
It may be a copolymer containing 0 mol% or less of the third component. In this case, as the dicarboxylic acid component, for example, one or more of isophthalic acid, phthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, sebacic acid and oxycarboxylic acid (for example, p-oxybenzoic acid). Can be used. As the glycol component, one kind or two or more kinds of ethylene glycol, propylene glycol, butanediol, 1,4-cyclohexanedimethanol, neopentyl glycol and the like can be used.

By the way, commercially available plastic substrates include
In order to provide adhesiveness with printing ink and adhesiveness with adhesives used in the laminating process with other laminating materials, some have been subjected to surface oxidation treatment such as corona discharge treatment,
When such a commercially available product is used without carrying out the surface oxidation treatment of the present invention, it is impossible to obtain a sufficiently strong adhesive force which is the object of the present invention.

A known extrusion laminator can be used in the pressure bonding step of the present invention.

In the present invention, it is preferable that the surface oxidation treatment step and the pressure-bonding step are provided in-line, and the plastic substrate after the surface oxidation treatment step is immediately subjected to the pressure-bonding step. As a result, a higher level of adhesive strength is exhibited and undesired blocking of the base film is prevented. It should be noted that the above-mentioned "providing a crimping step in-line and immediately subjecting the plastic substrate after the surface oxidation treatment step to the crimping step" means, in extrusion lamination processing, a feeding step of the plastic substrate, a surface oxidation treatment step, a crimping step. Also, it means that the product winding step uses a device sequentially installed on the same line along the flow direction of the plastic base material, and these steps are rapidly performed in a series of operations.

In the present invention, from the viewpoint of further improving the adhesive strength, before the surface oxidation treatment step, the plastic base material to be subjected to the surface oxidation treatment step is kept at a temperature of 40 ° C. or higher and lower than the melting point of the plastic base material. It is preferable to provide a heating step before surface oxidation, which is a heating step.

The heating temperature is not lower than 40 ° C. and not higher than the melting point of the plastic substrate, preferably not lower than 60 ° C. and not higher than 30 ° C. lower than the melting point of the substrate. here,
The temperature refers to the surface temperature of the plastic substrate, and can be measured by, for example, a contact type thermometer. If the heating temperature is too low, the improvement in the adhesive strength between the plastic substrate and the resin for extrusion laminating in the obtained laminated film or laminated sheet may be insufficient, while if it is too high, shrinkage or curling of the plastic substrate may occur. It becomes a problem. The heating of the plastic substrate is optimally performed by using a far infrared heater or a heating roll. For example, in the process of conveying the plastic base material to the surface oxidation treatment step, it may be passed under the far infrared heater. For example, if the plastic base material has a width of 500 mm, the output of the far infrared heater is about 1 to 30 kW. (If you use multiple heaters, the total output), keep the distance between the heater and the surface of the plastic substrate about 1 to 30 cm,
It may be heated for about 0.05 to 5 seconds.

In the present invention, from the viewpoint of further improving the adhesive strength, it is preferable to provide an aging step, which is a step of aging the laminated film or sheet obtained in the pressure-bonding step under heat retention after the pressure-bonding step.

The aging temperature is usually 30 ° C. or higher and lower than 50 ° C., preferably 40 to 45 ° C. If the aging temperature is too low, the adhesive strength may not be sufficiently improved, while if it is too high, the heat-sealing performance and hot tack performance of the laminated resin may be deteriorated. Furthermore, the laminate film may curl, and inconvenience may occur in the slitting process and the filling process of the contents,
In addition, the laminate resin may be deteriorated and cause an odor problem.

The aging time is usually 1 to 120 hours, preferably 10 to 80 hours. If the aging time is too short, the improvement of the adhesive strength may be insufficient. On the other hand, if it is too long, the extrusion-laminated resin may be deteriorated, which is also disadvantageous in terms of productivity.

To carry out the aging step, a normal oven or a room in which the temperature can be adjusted may be used.

In the present invention, a heating step before surface oxidation,
By performing all of the surface oxidation treatment step, the ozone treatment step, the pressure bonding step and the aging step in combination, it is possible to realize stronger adhesive strength.

Next, a concrete embodiment of the surface oxidation treatment step will be described.

The surface oxidation treatment step is specifically carried out by a corona discharge treatment step, a plasma treatment step, a flame plasma treatment step, an electron beam irradiation treatment step, an ultraviolet ray irradiation treatment step and the like.

The corona discharge treatment step is a step of subjecting at least one surface of the plastic substrate to corona discharge treatment.
The corona discharge treatment is performed, for example, by using a known corona discharge treatment device and passing a plastic substrate through the generated corona atmosphere. From the viewpoint of maintaining the adhesive strength at a high level, the corona discharge density is 40
(W · min / m ² ) or more is preferable, and more preferably 50
(W · min / m ² ) or more. There is no particular upper limit to the corona discharge density, but from the economical point of view, it is 200 (W · min / m ² )
The following are preferred. However, the preferable corona discharge density when using the heating step before surface oxidation and / or the aging step is:
It is 10 (W · min / m ² ) or more.

In the plasma treatment step, a simple substance or a mixed gas such as argon, helium, krypton, neon, xenon, hydrogen, nitrogen, and air is electronically excited by a plasma jet, and then charged particles are removed and electrically charged. It can be carried out by spraying a neutralized excited inert gas onto the surface of the plastic substrate.

The flame plasma treatment step can be carried out by blowing ionized plasma in the flame produced when burning natural gas or propane onto the surface of the plastic substrate.

The electron beam irradiation treatment step is carried out by irradiating the surface of the plastic substrate with an electron beam generated by an electron beam accelerator. As the electron beam irradiation device, for example, a device "Electron Curtain" (trade name) that can irradiate a curtain-shaped uniform electron beam from a linear filament can be used.

The ultraviolet irradiation treatment step is, for example, 200 to 4
It is carried out by irradiating the surface of the plastic substrate with ultraviolet rays having a wavelength of 00 mμ.

In the present invention, the resin extruded and laminated on the plastic substrate can be applied to the heat-sealing layer of the laminated film or sheet, and can also be applied to the intermediate layer of the laminated film or sheet. It is used properly depending on the function of the resin, such as easy heat sealability and moisture resistance. The present invention can also be applied to the sandwich extrusion lamination method.

In the resin for extrusion lamination of the present invention, known additives such as anti-oxidants, anti-blocking agents, weathering agents, neutralizing agents, flame retardants, antistatic agents can be added to the extent that the effects of the present invention are not impaired. , An antifogging agent, a lubricant, a dispersant, a pigment, an organic or inorganic filler, and the like may be used in combination.

The laminated film for packaging or the laminated sheet for packaging obtained by each of the above steps does not have an anchor coating agent component such as an organic solvent remaining on the film or sheet, and there is no fear of odor resulting from it. Since the resin for extrusion lamination can be processed at low temperature, there is no deterioration of the odor surface due to evaporation of low molecular weight components and volatile components contained in the resin, and it is suitable for packaging materials such as packaging bags or packaging containers, for example, food packaging materials, Optimal for pharmaceutical packaging materials and cosmetic packaging materials.

Foods packaged by the packaging bag or packaging container of the present invention can be roughly classified into liquid foods, wet foods, oil and fat processed foods, dried foods and the like. Examples of liquid foods and moist foods include processed soybean products such as pickles, side dishes and miso, natto, tofu, seafood paste products such as kamaboko, chikuwa, hanpen, processed fish products (ham, sausage), boiled vegetables, boiled beans, etc.
Cooked foods such as stewed foods, oden, and sushi, frozen foods,
Examples thereof include jam, marmalades, liquid soups, sauces, liquors, liqueurs, soy sauce, vinegar, sauces, dressings, seasonings, noodle soups, cola concentrates, concentrated fruit juices, mineral water, and juices. Examples of processed fats and oils include edible oils, mayonnaise, cheese, processed fats and oils such as chocolate, processed products such as ham, wiener sausage and chilled beef, raw cream, ice cream raw materials, yogurt, cold confectionery, powdered milk products. Milk processed products such as. Examples of dry foods include instant noodles, rice cakes, milled rice, dried cooked rice, wheat flour, rice powder, macaroni, spaghetti, grain processed products such as bread, powder soup, powdered juice, chemical seasonings, powdered products such as sugar and salt, Ochazuke seaweed, dried seaweed, seaweed processed products such as Kiribushi, favorite foods such as Japanese tea, black tea, coffee, rice confectionery, bean confectionery, oil confectionery, snack foods, Japanese confectionery, confectionery products such as Western confectionery, etc. To be

The medicines and medical products to be packaged by the packaging bag or container of the present invention include various packaged medicines, special nutritional foods, functional foods, SP chemicals, various ointments, medical dentifrices, special powder preparations (abnormal odor absorption) Performance), quasi drugs, infusion solutions, dialysis solutions, sterile purified water, medical test reagents, wash water, poultices,
Examples include sutures.

The cosmetics to be packaged by the packaging bag or the packaging container of the present invention include creamy cosmetics, shampoos, rinses, face soaps, detergents, bath salts and the like.

The packaging bag or packaging container of the present invention can be used as a dried product, a liquid product or a wet product in the above foods, medicines, medical products and cosmetics.

The method for producing the packaging bag or the packaging container of the present invention is not particularly limited, and examples of the packaging bag include a pillow bag, a three-sided bag, a gusset bag, a square bottom bag, and a standing pouch bag. For the packaging container, a manufacturing method such as thermoforming may be mentioned.

The material of the plastic substrate used for the food packaging bag or the food packaging container is selected depending on the type, shape, storage period, transportation method, filling method, commercial property, usage method and the like of the food. The resin for extrusion lamination is also selected depending on the performance required for the food packaging bag, and examples thereof include polyethylene resin, polypropylene resin, ethylene-vinyl ester copolymer resin, ethylene- (meth) acrylic ester copolymer. At least one resin for extrusion laminating selected from polymer resins and the like is preferable. As a plastic base material, for example, polyester resin, cellophane, polypropylene resin, ethylene-vinyl alcohol copolymer, nylon resin, polyvinyl chloride resin, etc. can be used for medicines, medical goods packaging bags or medicines, medical goods packaging containers. At least one plastic substrate selected from is preferable,
Further, as the resin for extrusion lamination, for example, at least one extrusion laminate selected from polyethylene resin, polypropylene resin, ethylene-vinyl ester copolymer resin, ethylene- (meth) acrylic acid ester copolymer resin and the like. Resins for use are preferred. In the cosmetic packaging bag or the cosmetic packaging container, as a plastic substrate, for example, at least one plastic substrate selected from polyester resins, polypropylene resins, polyethylene resins, etc. is preferable, and as a resin for extrusion lamination, for example, At least one resin for extrusion laminating selected from polyethylene resins, ethylene-vinyl ester copolymer resins, ethylene- (meth) acrylic acid ester copolymer resins and the like is preferable.

Further, the packaging bag or packaging container of the present invention can be directly packaged with these foods, pharmaceuticals / medical products, cosmetics and other industrial materials or industrial materials alone, but an outer packaging for collectively packaging individual packaging bags. It can also be used as a bag. Further, the present invention is a packaging material other than plastic materials, for example, paper base materials such as high-quality paper, cloud paper, thin paper, kraft paper, aluminum foil, metal materials such as iron, etc. It can also be compounded.

[0057]

EXAMPLES Next, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples.

The measurement and evaluation methods used in Examples and Comparative Examples are as follows. (1) Measurement of (O / C) ^* and (O / C) ⁰ FI Surface Science System
Using ESCALABMK-II manufactured by the company, O _1S and C
The abundance ratio of oxygen and carbon (O / C) was calculated from the ratio of the area ratio of each peak intensity of _1S multiplied by the relative sensitivity of each peak.
I asked. In addition, (O / C) ^* is a measured value 30 minutes after the resin is extrusion-laminated and laminated. However,
The actual measurement was performed on the surface of a plastic base material to which the resin for extrusion laminating was not separately prepared, subjected to surface oxidation treatment in the same manner as the base material to be adhered.

(2) Evaluation Method Membrane Adhesive Strength Measurement A laminated film having a width of 15 mm was sampled, and it was measured by using an auto strain type tensile tester manufactured by Toyo Seiki Co., Ltd.
The film adhesiveness was evaluated from the peel strength when the laminating resin was peeled by 180 degrees from the plastic substrate or the plastic laminated substrate at a pulling speed of 00 mm / min.

Bag-breaking test 1 (hot water filling bag) After slitting the laminated film into a size of 120 mm in width, 80 ° C. using a high-speed liquid automatic filling and packaging machine manufactured by Komatsu Ltd.
Filled with hot water. Immediately thereafter, a bag-breaking bag breaking tester manufactured by Komatsu Ltd. was used to carry out and evaluate the bag breaking resistance test. The test conditions are as follows. Filling bag dimensions: 60 mm x 85 mm Filling speed: 80 bags / min Filling material: Hot water 80 ° C Evaluation load: 100 kg Filling amount: 19 g / bag Evaluation time: 3 minutes 1) None: Passed the bag breaking test or leak test. Indicates that. 2) "-" in the table indicates that the evaluation was not performed. The same applies to the following bag breaking test.

Bag-breaking test 2 (after boil treatment) The hot-water-filled bag sample used in the bag-breaking test 1 was gradually cooled all day and night, and then boiled using a small retort high-pressure steam sterilizer manufactured by Alp Co., Ltd. Furthermore, after slowly cooling the sample for one day,
A bag-breaking bag breaking tester manufactured by Komatsu Ltd. was used to carry out and evaluate the bag breaking test. The test conditions are as follows. Filling bag dimensions: 60 mm x 85 mm Evaluation load: 100 kg Filling amount: 19 g / bag Evaluation time: 3 minutes Boil treatment: 95 ° C x 30 minutes

Bag-breaking test 3 (oil-filled bag) A commercially available edible salad oil was filled using the same method as the sample used in the bag-breaking test 1. Immediately thereafter, a bag breakage resistance test was carried out using a load type bag breakage tester manufactured by Komatsu Ltd. and evaluated. The test conditions are as follows. Filling bag dimensions: 60 mm x 85 mm Evaluation load: 100 kg Filling material: Edible salad oil Evaluation time: 3 minutes Filling amount: 19 g / bag

Bag-breaking test 4 (bag filled with 20% ethanol in aqueous solution) After slitting the laminated film into a size of 120 mm in width, the laminated film was wrapped using a high-speed liquid automatic filling and packaging machine manufactured by Komatsu Ltd. without being filled with the filling liquid. An unfilled bag with a three-way seal was prepared by performing a horizontal seal and a vertical seal on the lower part and the upper part of the material. Then, a part of the upper part of the packaging material was cut and filled with an aqueous solution of 20% by volume of ethanol, and a heat sealer manufactured by Tester Sangyo Co., Ltd. was used to horizontally seal the upper part of the packaging material to obtain a filling bag. Then, after adjusting the condition at 23 ° C. and 50% humidity for 30 days, a bag breakage resistance test was carried out using a load type bag breakage tester manufactured by Komatsu Ltd., and evaluated. The test conditions are as follows. Dimensions of filling bag: 60 mm × 120 mm Evaluation load: 100 kg Filling material: 20% by volume aqueous solution of ethanol Evaluation time: 3 minutes Filling amount: 19 g / bag

Bag-breaking test 5 (acetic acid 20% aqueous solution filled bag) After slitting the laminated film into a size of 120 mm in width, it was wrapped without being filled with the filling liquid using a high-speed liquid automatic filling and packaging machine manufactured by Komatsu Ltd. An unfilled bag with a three-way seal was prepared by performing a horizontal seal and a vertical seal on the lower part and the upper part of the material. Thereafter, a part of the upper part of the packaging material was cut and filled with an aqueous solution of 20% by volume of acetic acid, and a heat sealer manufactured by Tester Sangyo Co., Ltd. was used to laterally seal the upper part of the packaging material to obtain a filling bag. Then, after conditioning for 30 days at 23 ° C and 50% humidity,
A bag-breaking bag breaking tester manufactured by Komatsu Ltd. was used to carry out and evaluate the bag breaking test. The test conditions are as follows. Filling bag dimensions: 60 mm x 120 mm Evaluation load: 100 kg Filling material: Acetic acid 20% by volume aqueous solution Evaluation time: 3 minutes Filling amount: 19 g / bag

Bag-breaking test 6 (detergent-filled bag) After slitting the laminated film into a size with a width of 120 mm, a high-speed liquid automatic filling and packaging machine manufactured by Komatsu Ltd. was used to lower the packaging material without filling the filling liquid. An unfilled bag with a three-way seal was prepared by performing horizontal sealing and vertical sealing on the top of the parts. After that, a part of the upper part of the packaging material was cut and filled with liquid detergent (Mama Royal) manufactured by Lion Co., Ltd., and a heat sealer manufactured by Tester Sangyo Co., Ltd. was used to horizontally seal the upper part of the cut packaging material to form a filling bag did. Then, at 23 ℃ and 50% humidity, 30
After adjusting the condition for a day, a bag breakage resistance test was carried out using a load type bag breakage tester manufactured by Komatsu Ltd. and evaluated. The test conditions are as follows. Filling bag dimensions: 60 mm x 120 mm Evaluation load: 100 kg Filling material: Detergent Evaluation time: 3 minutes Filling amount: 19 g / bag

Air bubble leakage test After slitting the laminated film into a size of 120 mm in width, using a high-speed liquid automatic filling and packaging machine made by Komatsu Ltd., air was filled instead of the filling liquid, then made by Yamato Scientific Co., Ltd. The packaging material was expanded under reduced pressure water of -400 mmHg using the vacuum drying apparatus of. Then, the leakage of air bubbles from the heat-sealed portion was visually observed and evaluated. The test conditions are as follows. Filling bag dimensions: 60 mm x 85 mm Water depth: 150 mm Filling material: Air Retention time: 3 minutes

Odor sensory test The odor sensory test was conducted by the following method. Laminated film (1
5 cm x 7 cm) into a 1-liter wide-mouthed bottle, covered with aluminum foil, and then heated at 50 ° C x 1 hr.
The heating treatment was performed under the conditions of. Then, it was gradually cooled for 30 minutes to obtain a sample. Then, eight selected panelists sniffed the odor of the laminated film in the wide-mouthed bottle to determine the odor intensity. The odor intensity at that time was evaluated as 4 ranks, and the rank with the largest number of the 8 panelists was used as the evaluation result of the sample. The symbol of the odor sensory test represents the following judgment. “A”: It is a level close to odorless and may be applicable to all packaging materials. "○": The odor level is low and the packaging material is widely used. “△”: There is an odor, but there is no problem depending on the use of the packaging material. “X”: There is an odor, and its use as a packaging material is limited.

Example 1 Low density polyethylene (LDPE: Sumikasen L5816, MFR 10 g / 10 min, density 0.917 g / cm ³ manufactured by Sumitomo Chemical Co., Ltd.) and linear low density polyethylene (L
LDPE: Sumitomo Chemical Co., Ltd. product name Sumikasen αCS8
026, MFR 10 g / 10 minutes, density 0.914 g / c
m ³ ) are melt-kneaded with two extruders each having a diameter of 65 mmφ, and LDPE is applied to the adhesive layer from the multi-slot T die to the substrate at a resin temperature of 305 ° C. and the sealant layer is L.
LDPE was extruded at a resin temperature of 290 ° C. The film width at that time was 450 mm, and the total thickness of the laminate layer was 60 μ.
(30 μm each), extruded at a laminating speed of 80 m / min to form a melted film, and then air containing 15 g / Nm ³ of ozone from a nozzle provided 30 mm below the die on the surface of the melted film that is adhered to the substrate. To 1.5 Nm ³ / h
The adhesive surface of the molten film was treated with ozone by spraying under the condition of r. The ozone treatment amount at this time is 10.
It was 4 mg / m ² . Then, the base material surface was surface-modified by a corona discharge treatment device at a treatment density of 103 w · min / m ^{2 to} obtain a 15 μ biaxially stretched EVOH film (EVOH film).
Represents an ethylene-vinyl alcohol copolymer). Further, the obtained laminated film was aged at 45 ° C. for 72 hours in an air atmosphere using a heating oven to obtain a laminated film for packaging. Using the obtained laminated film for packaging, a packaging bag was manufactured based on the above evaluation method. Table 1 shows the processing conditions and the evaluation results.

Examples 2 to 8 The same procedure as in Example 1 was carried out except that the conditions shown in Tables 1 and 2 were used. However, in Examples 2, 3 and 6, the T die was changed to a single type die to form a single layer laminate. The processing conditions and the evaluation results are shown in Tables 1 and 2.

Comparative Examples 1 to 7 The same procedures as in Example 1 were carried out except that the conditions shown in Tables 3 and 4 were used. However, in Comparative Example 3, the T die was changed to a single type die to form a single layer laminate. Further, in Comparative Example 3, in order to promote the adhesion with the base material, an anchor coating agent (Citabond 120 manufactured by Nippon Soda Co., Ltd.) dissolved in ethyl acetate was applied to the base material and passed through a drying device at 80 ° C. to remove the solvent. Was evaporated and then laminated on a substrate.
The processing conditions and the evaluation results are shown in Tables 3 and 4.

Example 9 As a plastic substrate, a plastic laminated base material in which a 20 μ biaxially stretched OPP film and a 15 μ biaxially stretched EVOH film were laminated by a dry lamination method was used, and the EVOH surface of the base material had a low density. Polyethylene (LDP
E: Sumikasen L5816, MF manufactured by Sumitomo Chemical Co., Ltd.
R10 g / 10 min, density 0.917 g / cm ³ ) was laminated in a single layer. Here, the processing was performed in the same manner as in Example 1 except that the processing conditions are shown in Table 5. The evaluation results are shown in Table 5.

Example 10 As a plastic substrate, a 15 μ biaxially stretched EVOH film was coated with low density polyethylene (LDPE: Sumikasen L5816 manufactured by Sumitomo Chemical Co., Ltd., MFR 10 g / 10).
Min, density 0.917 g / cm ³ ) at a processing temperature of 290 ° C., a processing speed of 80 m / min, and a plastic laminated base material extruded and laminated at a laminate thickness of 30 μ.
Linear low density polyethylene (LLDPE: Sumikasen αCS8026 manufactured by Sumitomo Chemical Co., Ltd., MFR10g on E side)
/ 10 min, density 0.914 g / cm ³ ) was laminated in a single layer. Here, the processing was performed in the same manner as in Example 1 except that the processing conditions are shown in Table 5. The evaluation results are shown in Table 5.

Example 11 As a plastic substrate, a low-density polyethylene (LDP) was applied to the aluminum foil surface of a dry laminated film of a 12 μ biaxially stretched PET film and 9 μ aluminum foil.
E: Sumikasen L5816, MF manufactured by Sumitomo Chemical Co., Ltd.
R10g / 10 min, density 0.917 g / cm ³⁾ is the processing temperature 315 ° C., processing speed 80 m / min, laminating thickness 30μ
Using a plastic laminated base material extruded and laminated with
Linear low density polyethylene (LLD) is formed on the LDPE surface of the base material.
PE: Sumikasen αCS802 manufactured by Sumitomo Chemical Co., Ltd.
6, MFR 10 g / 10 min, density 0.914 g / cm ² ) was laminated in a single layer. Here, the processing was performed in the same manner as in Example 1 except that the processing conditions are shown in Table 5. The evaluation results are shown in Table 5.

Comparative Examples 8 to 10 The same procedure as in Example 1 was carried out except for the conditions shown in Table 6.
However, the T die was changed to a single type die to form a single layer laminate. The evaluation results are shown in Table 6.

[0075]

[Table 1]

[0076]

[Table 2]

[0077]

[Table 3]

[0078]

[Table 4]

[0079]

[Table 5]

[0080]

[Table 6]

* 1 Plastic substrate EVOH: Biaxially stretched EVOH (here, EVOH means ethylene-vinyl alcohol copolymer), made by Kuraray Co., Ltd. EF-XL type 15 μ CEVOH: unstretched EVOH, made by Kuraray Co., Ltd. EF-E type 20μ ONy: Biaxially stretched nylon, manufactured by Unitika Ltd. ON type 15μ PET: Biaxially stretched polyester, manufactured by Toyobo Co., Ltd. E
5100 type 25μ OPP / EVOH: dry laminated film of biaxially oriented polypropylene film and biaxially oriented EVOH film, biaxially oriented polypropylene film manufactured by Kite Chemical Co., Ltd., P2 manufactured by Toyobo Co., Ltd.
241 type 20μ biaxially stretched EVOH, Kuraray EF-XL type 15
μ EVOH / LD1: LDPE extrusion laminated film on biaxially stretched EVOH film substrate Biaxially stretched EVOH, EF-XL type 15 manufactured by Kuraray Co., Ltd.
μ LDPE, Sumikasen L5816, MFR10g / 1
0 minutes, density 0.917 g / cm ³ Other base materials PET / AL / LD1: LDPE for biaxially stretched polyester film and aluminum foil dry laminated base material
Extrusion Laminated Film Biaxially Stretched Polyester Film, Unitika PTM
Type 12μ AL foil, 9μ LDPE, Sumikasen L5816, MFR10g / 1
0 minutes, density 0.917 g / cm ³

* 2 Extrusion laminating resin LL: LLDPE, linear low density polyethylene, Sumikasen α CS8026 manufactured by Sumitomo Chemical Co., Ltd., MFR
10 g / 10 min, density 0.914 g / cm ³ LD1: LDPE, low density polyethylene, Sumikasen L5816 manufactured by Sumitomo Chemical Co., Ltd., MFR 10 g / 10
Min, density 0.917 g / cm ³ LD2: LDPE, low density polyethylene, Sumikasen L716-H manufactured by Sumitomo Chemical Co., Ltd., MFR 7 g / 10
Min, density 0.919 g / cm ³ LD3: LDPE, low density polyethylene, Sumikasen L718-H manufactured by Sumitomo Chemical Co., Ltd., MFR 8 g / 10
Min, density 0.919 g / cm ³ EMMA: ethylene-methyl methacrylate copolymer,
Sumitomo Chemical Co., Ltd. Acryft WH302, MFR
7 g / 10 minutes, density 0.930 g / cm ³ , methyl methacrylate content 15 wt%

* 3 Processing conditions 1) Co-extrusion: Co-extrusion laminating process Single layer: Single-layer lamination process 2) No: No anchor coat treatment Yes: Anchor coat treatment (Nippon Soda Co., Ltd.)
(Titabond 120 is used) 3) "-" in the table indicates that the treatment was not performed. * 4 Evaluation 1) None: Indicates that the bag breaking test or leak test has passed. 2) "-" in the table indicates that the evaluation was not performed.

[0084]

INDUSTRIAL APPLICABILITY As described above in detail, the present invention is a packaging bag or packaging container obtained from a laminated film or laminated sheet containing no anchor coating agent, which has no odor and can be used in various bag breaking tests. A packaging bag or packaging container having improved durability can be provided. Further, since the packaging bag or packaging container of the present invention has the above-mentioned excellent properties, it is a food packaging bag or food packaging container, a pharmaceutical / medical product packaging bag or a pharmaceutical / medical product packaging container, and a cosmetic packaging bag or cosmetic product. It is useful as a packaging container. Furthermore, the packaging bag or packaging container of the present invention is most suitable for filling dry matter, liquid matter, or moist matter.

[Brief description of drawings]

FIG. 1 is a view showing a change with time of ΔO / C value of a corona-treated biaxially stretched nylon surface.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B32B 27/32 Z 9349-4F 31/30 9349-4F B65D 65/40 A // B65D 30/02 (72) Inventor Hiroaki Takahata 1-5 Anezaki Kaigan, Ichihara, Chiba Prefecture Sumitomo Chemical Co., Ltd. (72) Inventor Koji Kubo 1-5 Anezaki Kaigan, Ichihara, Chiba Sumitomo Chemical Co., Ltd. (72) Invention Yuto Goto 1-5, Anezaki coast, Ichihara city, Chiba Sumitomo Chemical Co., Ltd.

Claims (6)

[Claims] 1. A packaging bag or container comprising the following laminated film for packaging or laminated sheet for packaging. Plastic substrate, polyethylene resin, polypropylene resin, ethylene-vinyl ester copolymer resin and ethylene-
A packaging laminated film or a packaging laminated sheet made of an extrusion laminating resin which is one kind selected from the group consisting of (meth) acrylic acid ester-based copolymer resins, wherein the following surface oxidation treatment step, ozone treatment step and pressure bonding are performed. A laminated film for packaging or a laminated sheet for packaging which includes the steps and does not use an anchor coating agent. Surface oxidation treatment step: a step of subjecting at least one surface of a plastic substrate to a surface oxidation treatment. Ozone treatment process: 180-34 resin for extrusion lamination
A step of melt-extruding into a film at a temperature of 0 ° C. and subjecting at least one surface of the film to ozone treatment. Pressure-bonding step: a step of bringing the surface-oxidized surface of the plastic substrate obtained in the surface-oxidation treatment step into contact with the ozone-treated surface of the film obtained in the ozone-treatment step to pressure-bond the film and the plastic substrate. Then, the step of forming the relationship represented by the following formula for the surface oxidation-treated surface of the plastic base material subjected to pressure bonding. (1) When the plastic substrate is a polyester resin Δ (O / C) ≧ 0.08 (2) When the plastic substrate is other than the polyester resin Δ (O / C) ≧ 0.05 where Δ (O / C) = (O / C) ^* − (O / C) ⁰ , where (O / C) ⁰ is oxygen measured by the ESCA method on the surface of the plastic substrate that has not been surface-oxidized. Represents the ratio of each atom number of atoms and carbon atoms,
(O / C) ^* represents the ratio of the number of oxygen atoms to the number of carbon atoms measured by the ESCA method on the surface of the plastic substrate that has been subjected to the surface oxidation treatment of the present invention. 2. The packaging bag or packaging container according to claim 1, wherein the packaging bag or packaging container is a food packaging bag or food packaging container. 3. The packaging bag or packaging container according to claim 1, wherein the packaging bag or packaging container is a pharmaceutical, medical product packaging bag or pharmaceutical, medical product packaging container. 4. The packaging bag or packaging container according to claim 1, wherein the packaging bag or packaging container is a cosmetic packaging bag or a cosmetic packaging container. 5. The packaging bag or packaging container according to any one of claims 1 to 4, wherein the packaging bag or packaging container is a packaging bag or packaging container used for a dried product. 6. The packaging bag or packaging container according to any one of claims 1 to 4, wherein the packaging bag or packaging container is a packaging bag or packaging container used for liquid substances or wet substances.