JP2021161279A - Substrate for forming vapor-deposited film, vapor-deposited substrate, laminate and packaging container - Google Patents

Abstract

To provide a substrate for forming a vapor-deposited film favorably usable for producing a mono-material packaging container, with high adhesion to a vapor-deposited film, and capable of effectively preventing delamination when made into a packaging container.SOLUTION: A substrate for forming a vapor-deposited film at least includes a first polyethylene resin layer with a vapor-deposited film formed on a surface thereof. The first polyethylene resin layer is composed of a polyethylene resin and an olefinic elastomer resin. A drawing process is applied to the substrate for forming a vapor-deposited film.SELECTED DRAWING: Figure 1

Description

The present invention relates to a base material for forming a vapor-deposited film, a vapor-deposited base material, a laminate, and a packaging container.

Conventionally, a resin film made of a polyester resin such as polyethylene terephthalate (hereinafter, also referred to as a polyester film) is excellent in mechanical properties, chemical stability, heat resistance and transparency, and is inexpensive. It is used as a base material constituting the laminate used in.

Such a polyester film is usually laminated with a polyethylene film which is a sealant layer to form a laminate, and then molded into a packaging container.

The above-mentioned packaging container made of a laminate of different types of resin films, that is, a polyester film and a polyethylene film, is difficult to separate into each layer, and the packaging container recovered after use. Is not suitable for recycling and is not actively recycled.

Then, for the purpose of improving the recyclability of the packaging container, instead of the polyester film, a stretched polyethylene film (stretched polyethylene film) is applied to the base material, and packaging using a laminate composed of the same material is used. The production of containers (monomaterial packaging containers) is being considered.

Recently, the present inventors have attempted to form a vapor-deposited film on the surface of a stretched polyethylene film in order to compensate for the gas barrier property, design, and gloss that have deteriorated due to the change of the polyester film to a stretched polyethylene film. The adhesion between the polyethylene film and the vapor-deposited film is not sufficient, and when a packaging container is manufactured using the stretched polyethylene film on which the vapor-deposited film is formed, peeling (delamination) may occur between the stretched polyethylene film and the vapor-deposited film. I found a new issue that there is.

Surprisingly, the present inventors have added an olefin-based elastomer together with the polyethylene resin to the layer forming the vapor-deposited film of the base material made of the polyethylene resin, so that the layer and the vapor-deposited film are formed. It was found that the adhesion can be remarkably improved and the above problem can be solved.
The reason why the adhesion to the vapor-deposited film is improved is not clear, but it is considered as follows.
Usually, the polyethylene film subjected to the stretching treatment tends to have a reduced adhesion to a vapor-deposited film such as aluminum because the amorphous component is reduced and the oriented crystals are increased.
In the present invention, it is considered that by incorporating an olefin-based elastomer together with the polyethylene resin, the orientation crystallization during stretching can be adjusted and the adhesion to the vapor-deposited film is maintained.

The present invention has been made based on such findings, and the problem to be solved is that it can be suitably used for producing a monomaterial packaging container, has high adhesion to a thin-film deposition film, and has a high adhesion to the packaging container. It is an object of the present invention to provide a base material for forming a vapor-deposited film, which can effectively prevent delamination in the case of the above.

Another object to be solved by the present invention is to provide a laminate, a laminate and a packaging container provided with the above-mentioned substrate for forming a vapor-deposited film.

The thin-film deposition film-forming base material of the present invention is at least a thin-film deposition film-forming base material provided with a first polyethylene resin layer on which the vapor-deposited film is formed on the surface.
The first polyethylene resin layer is composed of a polyethylene resin and an olefin-based elastomer resin.
The base material for forming a vapor-deposited film is characterized in that it has been stretched.

In one embodiment, the olefin-based elastomer resin is an ethylene-based elastomer resin.

In one embodiment, the olefin-based elastomer resin is an olefin-based block copolymer.

In one embodiment, the olefin block copolymer is an ethylene / α-olefin interpolymer.

In one embodiment, the ethylene / α-olefin interpolymer comprises a hard block made of polyethylene and a soft block made of an α-olefin monomer.

In one embodiment, the content of the olefin-based elastomer resin in the first polyethylene resin layer is 1% by mass or more and 40% by mass or less.

In one embodiment, the density of the polyethylene resin contained in the first polyethylene resin layer is 0.970 g / cm ³ or less.

In one embodiment, the substrate for forming a vapor-deposited film has a multilayer structure and has a multilayer structure.
Each layer constituting the vapor-deposited film-forming base material having a multi-layer structure is made of a polyolefin resin.

In one embodiment, the densities of the polyethylene resins that make up the adjacent layers are different and have a density gradient.

In one embodiment, the density difference of the polyethylene resins between the adjacent layers is 0.05 g / cm ³ or less.

The vapor-deposited substrate of the present invention comprises at least a substrate and a vapor-deposited film.
The base material comprises the above-mentioned base material for forming a vapor-deposited film.
The vapor-deposited film is characterized in that it is provided on the first polyethylene resin layer of the substrate for forming the vapor-deposited film.

The laminate of the present invention comprises at least a base material, a vapor-deposited film, and a first sealant layer.
The base material comprises the above-mentioned base material for forming a vapor-deposited film.
The thin-film deposition film is provided on the first polyethylene resin layer of the substrate for forming the thin-film deposition film.
The first sealant layer is made of a polyethylene resin.

In one embodiment, a second sealant layer is further provided on a surface opposite to the surface of the base material provided with the sealant layer.
The second sealant layer is made of polyethylene resin.

In one embodiment, the laminate of the present invention is further provided with a barrier coat layer between the first sealant layer and the vapor-deposited film.

In one embodiment, the laminate of the present invention is used in a packaging container.

In one embodiment, the content of the polyethylene resin in the entire laminate is 80% by mass or more.

The packaging container of the present invention is characterized by being made of the above-mentioned laminate.

In one embodiment, the packaging container is a laminated tube.

According to the present invention, it can be suitably used for producing a monomaterial packaging container, the adhesion between layers with a vapor-deposited film can be remarkably improved, and a preferable gas barrier property can be achieved. Can be provided,
Further, according to the present invention, it is possible to provide a laminated body including the above-mentioned base material and a vapor-deposited film.
Further, according to the present invention, it is possible to provide a packaging container made of a laminate including the above-mentioned base material, a vapor-deposited film, and a sealant layer.

It is a schematic cross-sectional view which shows one Embodiment of the base material 10 for forming a vapor-deposited film of this invention. It is a schematic cross-sectional view which shows one Embodiment of the vapor deposition base material 20 of this invention. It is a schematic structural drawing which shows one Embodiment of a thin-film deposition apparatus. It is a schematic cross-sectional view which shows one Embodiment of the laminated body 30 of this invention. It is a schematic cross-sectional view which shows one Embodiment of the laminated body 30 of this invention. It is a front view which shows the laminated tube 40 which is one Embodiment of the packaging container of this invention. FIG. 6 is a cross-sectional view taken along the line aa of FIG. It is a front view which shows the packaging bag 50 which is one Embodiment of the packaging container of this invention. It is a perspective view which shows the stand pouch 60 which is one Embodiment of the packaging container of this invention.

(Base material for forming a thin-film deposition film)
The base material for forming a vapor-deposited film of the present invention includes a polyethylene resin layer as well as the first and second sealant layers composed of the polyethylene resin described later. As described above, since the base material and the sealant layer are made of the same resin material, the laminate can be used as a highly recyclable material such as a monomaterial packaging container.
The base material may be a single layer or a multi-layered material as long as it includes a polyethylene resin layer, but when the base material is a multi-layered base material, each polyolefin resin such as polyethylene resin is extruded by a separate extruder. It can be produced by a coextrusion method in which it is heated and melted, laminated in a molten state by a method such as a coextrusion multilayer die method or a feed block method, and then formed into a film by an inflation method or a T die method.

For example, in the case of a base material having a multilayer structure formed by a coextrusion method, the second, third, fourth ... Polyethylene resin layers are arranged in order from the first polyethylene resin layer on the side in contact with the vapor deposition film. (Hereinafter, in some cases, it may be referred to as "another polyethylene resin layer"). By providing the other polyethylene resin layer, it is possible to improve the performance such as heat resistance, strength, transparency, and stretchability of the laminate.

In the present invention, the base material is characterized in that it has been stretched. Thereby, the strength and heat resistance of the base material can be improved. It is also possible to improve printability.
The stretching treatment may be uniaxial stretching or biaxial stretching.

The stretching ratio of the base material in the vertical direction (MD direction) and the horizontal direction (TD direction) is preferably 2 times or more and 15 times or less, and preferably 3 times or more and 10 times or less.
By setting the draw ratio to 2 times or more, the strength and heat resistance of the base material can be further improved. In addition, the printability on the base material can be improved. Further, from the viewpoint of the breaking limit of the base material, the draw ratio is preferably 15 times or less.

In the present invention, the base material for forming a vapor-deposited film includes a first polyethylene resin layer composed of a polyethylene resin and an olefin-based elastomer resin as a layer on which the vapor-deposited film is formed.

As the polyethylene resin, high-density polyethylene resin (HDPE), medium-density polyethylene resin (MDPE), low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE) and ultra-low-density polyethylene resin (VLDPE) are used. can do.
Further, as the polyethylene resin, a copolymer of ethylene and other monomers can also be used.
Further, as the polyethylene resin, a polyethylene resin derived from biomass or a polyethylene resin mechanically recycled or chemically recycled can also be used.

The first polyethylene resin layer can contain a polyethylene resin having a density of 0.970 g / cm ^{3 or less.} By containing the polyethylene resin having a density of 0.970 g / cm ³ or less in the first polyethylene resin layer, the adhesion to the vapor-deposited film can be further remarkably improved.

The melting point of the polyethylene resin contained in the first polyethylene resin layer is preferably 110 ° C. or higher and 140 ° C. or lower, and more preferably 115 ° C. or higher and 135 ° C. or lower. By setting the melting point to 110 ° C. or higher, the processability at the time of producing the laminated body is improved from the viewpoint of heat resistance. By setting the melting point to 140 ° C. or lower, the difference in melting point of each layer in the multilayer structure is small, and stretching tends to be easy at a constant temperature.

The MFR of the polyethylene resin contained in the first polyethylene resin layer is preferably 0.1 g / 10 min or more and 5 g / 10 min or less, and more preferably 0.2 g / 10 min or more and 4 g / 10 min or less. By setting the MFR to 0.1 g / 10 min or more and 5 g / 10 min or less, the film-forming property of the inflation method is stabilized.

The content of the polyethylene resin in the first polyethylene resin layer is preferably 60% by mass or more and 99% by mass or less, and more preferably 70% by mass or more and 95% by mass or less. When the content of the polyethylene resin in the first polyethylene resin layer is 60% by mass or more, a laminate that can be suitably used for producing a monomaterial packaging container can be obtained. Further, when the content of the polyethylene resin in the first polyethylene resin layer is 99% by mass or less, a sufficient amount of the olefin-based elastomer resin can be contained in the first polyethylene resin layer, and the olefin-based elastomer resin can be contained in the first polyethylene resin layer. Adhesion can be improved.

In one embodiment, the olefin-based elastomer resin is an ethylene-based elastomer resin. By using an ethylene-based elastomer resin as the olefin-based elastomer resin, the laminate of the present invention can be suitably used for producing a monomaterial packaging container.

In one embodiment, the olefin-based elastomer resin is an olefin-based block copolymer. By incorporating an olefin-based block copolymer as an olefin-based elastomer resin in the first polyethylene resin layer, the adhesion between the vapor-deposited film and the first polyethylene resin layer can be further improved.
Block copolymers include sequences (blocks or segments) of the same monomeric units covalently attached to different types of sequences. Examples of the form of the block copolymer include AB having a diblock structure and ABA having a triblock structure (where A represents one block and B represents a different block or segment). Can be mentioned. Also, in multi-block copolymers, A and B can be connected in many different ways and repeated multiple times. It can also further include different types of additional blocks or segments. The multi-block copolymer may be a linear multi-block polymer or a multi-block star polymer (all blocks or segments bonded to the same atom or chemical moiety).

In one embodiment, the olefin block copolymer is an ethylene block copolymer, preferably an ethylene multiblock copolymer. By using an ethylene-based block copolymer as the olefin-based block copolymer, the laminate of the present invention can be suitably used for producing a monomaterial packaging container.

In one embodiment, the ethylene-based block copolymer is an ethylene / α-olefin interpolymer, and by using the ethylene / α-olefin interpolymer, the adhesion between the vapor deposition film and the first polyethylene resin layer is further improved. can do. The ethylene / α-olefin interpolymer includes ethylene and one or more copolymerizable α-olefin monomers in a polymerized form. Further, the interpolymer means a polymer prepared by polymerizing at least two kinds of monomers. Therefore, the interpolymer includes a copolymer which is a polymer of two kinds of monomers, a terpolymer which is a polymer of three kinds of monomers, and a polymer which is a polymer of four kinds or more kinds of monomers.

In one embodiment, the ethylene / α-olefin interpolymer, which is an ethylene-based block copolymer, comprises a hard block (hard segment) composed of polyethylene and a soft block (soft segment) composed of an α-olefin monomer.

Examples of the α-olefin monomer constituting the interpolymer include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, and the like. 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eicosene, cyclopentene, cycloheptene, norbornene, 5-methyl-2-norbornene, tetracyclododecene, 2-methyl-1,4 , 5,8-Dimethano-1,2,3,4,4a, 5,8,8a-Octahydronaphthalene, butadiene, isopene, 4-methyl-1,3-pentadiene, 1,3-pentadiene, 1,4 -Pentadiene, 1,5-hexadiene, 1,4-hexadiene, 1,3-hexadiene, 1,3-octadene, 1,4-octadien, 1,5-octadien, 1,6-octadien, 1,7-octadien , Etiriden norbornene, vinyl norbornene, dicyclopentadiene, 7-methyl-1,6-octadiene, 4-ethylidene-8-methyl-1,7-nonadien, 5,9-dimethyl-1,4,8-decatorien, 3 Included are −phenylpropene, 4-phenylpropene, 1,2-difluoroethylene, tetrafluoroethylene, styrene, and 3,3,3-trifluoro-1-propene.

As the olefin-based elastomer resin, a commercially available one may be used. For example, as an olefin-based block copolymer comprising a hard block composed of polyethylene and a soft block composed of α-olefin monomer, Dow Chemical Co., Ltd. INFUSE 9100 manufactured by INFUSE 9100 can be used.
Further, Toughmer A-4085S manufactured by Mitsui Chemicals, Inc. can also be used.

The content of the olefin-based elastomer resin in the first polyethylene resin layer is preferably 1% by mass or more and 40% by mass or less, and more preferably 5% by mass or more and 30% by mass or less. When the content of the olefin-based elastomer resin in the first polyethylene resin layer is 1% by mass or more, the adhesion between the first polyethylene resin layer and the vapor-deposited film can be further improved. Further, when the content of the olefin-based elastomer resin in the first polyethylene resin layer is 40% by mass or less, a laminate that can be suitably used for producing a monomaterial packaging container can be obtained.

The first polyethylene resin layer may contain a resin material (other resin material) other than the polyethylene resin as long as the characteristics of the present invention are not impaired. From the viewpoint of adhesion to the vapor-deposited film and recyclability, the first polyethylene resin layer preferably does not contain other resin materials.
Further, the first polyethylene resin layer can contain an additive as long as the characteristics of the present invention are not impaired, and for example, a cross-linking agent, an antioxidant, an anti-blocking agent, a slip agent, and an ultraviolet absorber. , Light stabilizers, fillers, reinforcing agents, antistatic agents, pigments and modifying resins.

The other polyethylene resin layer is made of polyethylene resin.
As the polyethylene resin, high-density polyethylene resin (HDPE), medium-density polyethylene resin (MDPE), low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE) and ultra-low-density polyethylene resin (VLDPE) are used. can do.
Further, as the polyethylene resin, a copolymer of ethylene and other monomers can also be used.
Further, as the polyethylene resin, a polyethylene resin derived from biomass or a polyethylene resin mechanically recycled or chemically recycled can also be used.

In the base material having a multi-layer structure, the densities of the polyethylene resins constituting the adjacent layers may be the same or different. That is, the polyethylene resin layer constituting the base material may be provided with a density gradient.
In a polyethylene resin layer provided with a density gradient, if the density difference between the layers is large, peeling (delamination) may occur at the interface. Therefore, the density difference between the layers is preferably at 0.05 g / cm ³ or less, further preferably 0.04 g / cm ³ or less.

(A) In one embodiment, the base material having a multilayer structure is composed of a first polyolefin resin layer, a second polyethylene resin layer composed of a medium-density polyethylene resin, and a linear low-density polyethylene resin. It has a five-layer structure consisting of a third polyethylene resin layer, a fourth polyethylene resin layer composed of a medium-density polyethylene resin, and a fifth polyolefin resin layer composed of a high-density polyethylene resin.
(B) In one embodiment, the base material having a multilayer structure includes a first polyethylene resin layer, a second resin layer composed of a blended resin of a high-density polyethylene resin and a medium-density polyethylene resin, and a medium-density polyethylene. A third polyethylene resin layer composed of a resin, a fourth polyethylene resin layer composed of a linear low-density polyethylene resin, a fifth polyethylene resin layer composed of a medium-density polyethylene resin, and a high density. It has a seven-layer structure consisting of a sixth resin layer composed of a blended resin of polyethylene resin and a medium-density polyethylene resin, and a seventh polyolefin resin layer composed of a high-density polyethylene resin.
(C) In one embodiment, the base material having a multilayer structure is composed of a first polyethylene resin layer, a second polyethylene resin layer composed of a linear low-density polyethylene resin, and a medium-density polyethylene resin. It has a three-layer structure with a third polyethylene resin layer.
(D) In one embodiment, the base material having a multilayer structure has a two-layer structure of a first polyethylene resin layer and a second polyolefin resin layer composed of a medium-density polyethylene resin.
(E) In one embodiment, the base material having a multilayer structure includes a first polyethylene resin layer containing an olefin-based elastomer resin, a second polyolefin resin layer composed of a medium-density polyethylene resin, and a linear low. A third polyolefin resin layer composed of a density polyethylene resin, a fourth polyolefin resin layer composed of a medium density polyethylene resin, and a fifth polyolefin resin layer composed of an olefin elastomer resin and a medium density polyethylene resin. It has a five-layer structure of

As one embodiment of the multi-layered base material by the coextrusion method as described above, for example, each resin is heated and melted by an extruder, and five layers composed of the first to fifth polyethylene resin layers are formed by the feed block method. After laminating, a tube-shaped film is formed by an inflation method, and the insides of the tubes are crimped to each other with a rubber roll or the like to form a 10-layer multilayer film. The multilayer film thus obtained has a vertically symmetrical layer structure in the cross-sectional thickness direction. That is, for example, when five layers composed of the first to fifth polyethylene resin layers are laminated by a coextruder, the obtained laminated films are obtained in the order of the first, second, third, fourth, and fifth layers from the surface. It is a base material having a layer structure of 10 layers composed of / 5th / 4th / 3rd / 2nd / 1st polyethylene resin layers. However, in reality, since the fifth polyethylene resin layer of the two adjacent layers in the center in the thickness cross-sectional direction can be regarded as one layer, it is substantially the 1st / 2nd / 3rd / 4th / 5th / 4th. It can be a base material having a multi-layer structure of 9 layers composed of / 3rd / 2nd / 1st polyethylene resin layers.
The multilayer structure film obtained by such a production method is sometimes referred to as a "block film". According to the above-mentioned production method, the number of defective products in production can be remarkably reduced, and finally the production efficiency can be improved.

The base material may have a printing layer on its surface, and the image formed on the printing layer is not particularly limited, and characters, patterns, symbols, combinations thereof, and the like are represented.
The print layer can be formed on the substrate by using an ink derived from biomass. As a result, the environmental load can be reduced.
The method for forming the print layer is not particularly limited, and examples thereof include conventionally known printing methods such as a gravure printing method, an offset printing method, and a flexographic printing method.

Further, the base material may be surface-treated. Thereby, the adhesion with the adjacent layer can be improved.
The surface treatment method is not particularly limited, for example, corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas and / or nitrogen gas, physical treatment such as glow discharge treatment, and oxidation using chemicals. Examples include chemical treatment such as treatment.

The thickness of the base material is preferably 1 μm or more and 60 μm or less, more preferably 9 μm or more and 60 μm or less, and further preferably 12 μm or more and 50 μm or less, regardless of whether the base material has a single-layer structure or a multi-layer structure. By setting the thickness of the base material to 1 μm or more, the heat resistance and strength of the base material can be improved. By setting the thickness of the base material to 60 μm or less, the processability of the base material can be improved.

(Thin-film deposition base material)
As shown in FIG. 2, the thin-film deposition base material 20 of the present invention includes the above-mentioned thin-film deposition film-forming base material 10 and the thin-film deposition film 21, and the thin-film deposition film 21 is provided on the first polyethylene resin layer 11. It is characterized by being.

Hereinafter, each layer included in the vapor deposition base material 20 will be described. Since the base material 10 for forming the vapor-deposited film has been described above, the description thereof is omitted here.

(Embedded film)
The vapor deposition base material 20 includes a vapor deposition film 21 on the first polyethylene resin layer 11. Thereby, the gas barrier property, specifically, the oxygen barrier property and the water vapor barrier property of the vapor-deposited base material 20 can be improved.

The vapor-deposited film may be composed of a metal or an inorganic oxide, and imparts a glossy feeling to the packaging container produced by using the vapor-deposited substrate 20 of the present invention. A vapor-deposited film made of a metal (hereinafter referred to as a metal-deposited film) is preferable because it can be used and the design property can be improved.
Examples of the metal constituting the metal vapor deposition film include aluminum, chromium, tin, nickel, copper, silver, gold and platinum.
Examples of the metal oxide include aluminum oxide, silicon oxide, magsium oxide, calcium oxide, zirconium oxide, titanium oxide, boron oxide, hafnium oxide and barium oxide.

Among the above, aluminum is particularly preferable because it has a high gas barrier property and can impart a good glossiness.

The surface of the vapor-deposited film is preferably subjected to the above surface treatment. Thereby, the adhesion with the adjacent layer can be improved.

The thickness of the thin-film deposition film is preferably 1 nm or more and 150 nm or less, more preferably 5 nm or more and 60 nm or less, and further preferably 10 nm or more and 40 nm or less.
By setting the thickness of the thin-film deposition film to 1 nm or more, the gas barrier property and glossiness of the thin-film deposition base film 20 can be further improved.
Further, by setting the thickness of the vapor-deposited film to 150 nm or less, the vapor-deposited base material 20 that can be suitably used for manufacturing a monomaterial packaging container can be obtained. Further, it is possible to prevent the occurrence of cracks in the thin-film deposition film 21.

As a method for forming the vapor deposition film, a conventionally known method can be adopted, for example, a physical vapor deposition method (Physical Vapor Deposition method, PVD method) such as a vacuum vapor deposition method, a sputtering method, or an ion plating method, or plasma chemical vapor deposition. Examples thereof include chemical vapor deposition methods (Chemical Vapor Deposition method, CVD method) such as phase growth method, thermochemical vapor deposition method, and photochemical vapor deposition method.
Hereinafter, one embodiment of the method for forming the thin-film deposition film will be shown, but the method for forming the thin-film deposition film is not limited thereto.

Specifically, (1) a vacuum vapor deposition method in which a metal or an oxide of a metal is used as a raw material, which is heated and vaporized, and this is vapor-deposited on a first polyethylene resin layer provided on a base material, (2) a raw material. Oxidation reaction vapor deposition method in which a metal or metal oxide is used as an oxide and oxygen is introduced to oxidize and vapor-deposited on the first polyethylene resin layer provided on the base material. A thin-film deposition film can be formed by using the above-mentioned oxidation reaction vapor deposition method or the like. In the above, as the heating method of the vapor-deposited material, for example, a resistance heating method, a high frequency induction heating method, an electron beam heating method (EB) or the like can be used.

The method of forming a vapor-deposited film of an inorganic substance and an inorganic oxide by the physical vapor deposition method will be described below.
FIG. 3 is a schematic configuration diagram showing an example of a take-up type vacuum vapor deposition apparatus. As shown in FIG. 3, in the vacuum chamber-B of the take-up type vacuum vapor deposition apparatus A, the base material X unwound from the unwinding roll C is cooled by the guide rolls D and E. Guided by drum F.
In one embodiment, in the device A, a plasma processing device G is arranged between the guide roll E and the cooled coating drum F. The plasma processing apparatus G irradiates the surface of the first polyethylene resin layer included in the base material X with plasma gas, and plasma the surface of the first polyethylene resin layer included in the base material X before forming the vapor deposition film. It is to be processed.
Next, a thin-film deposition source I (for example, metallic aluminum, aluminum oxide, etc.) heated and evaporated by the crucible H is placed on the first polyethylene resin layer provided by the base material guided on the cooled coating drum F. Accumulates to form a vapor deposition film. The deposition of the vapor deposition source I may be carried out through the masks J and J, and if necessary, oxygen gas or the like may be ejected from the oxygen gas outlet K.
Next, the base material X on which the vapor-deposited film is formed is sent out via the guide rolls L and M and wound around the take-up roll N to complete the thin-film deposition film formation by the present apparatus.
By repeating the above steps, a multi-layered vapor-deposited film formed of different materials may be obtained. The thin-film deposition film having a multi-layer structure may be formed by using the above-mentioned device twice, or may be formed by using the device in which the above-mentioned devices are connected.
The formation of such a thin-film film is disclosed in, for example, Japanese Patent No. 4569982.

(Laminated body)
As shown in FIG. 4, the laminate 30 of the present invention includes a thin-film deposition film-forming base material 10, a thin-film deposition film 21, and a first sealant layer 31.
Further, in one embodiment, as shown in FIG. 5, the laminate 30 includes a second sealant layer 32 on a surface opposite to the first sealant layer 31 side of the thin-film deposition film forming base material 10.
The laminated body 30 may have a barrier coat layer on the thin-film deposition film 21 (not shown).

The content of polyethylene with respect to the total amount of solids contained in the laminate 30 is preferably 80% by mass or more, and more preferably 90% by mass or more. This makes it possible to obtain a laminate that can be suitably used for producing a monomaterial packaging container.

Hereinafter, each layer included in the laminated body 30 will be described. Since the base material for forming the thin-film deposition film and the thin-film deposition film have been described above, the description thereof will be omitted here.

(First and second sealant layers)
The first and second polyolefin resin layers are composed of polyolefin, and examples thereof include polyethylene resin, polypropylene resin, polymethylpentene, ethylene-propylene copolymer and propylene-butene copolymer, among which recycled materials are used. From the viewpoint of suitability, polyethylene resin is preferable.

In one embodiment, the first and second polyolefin resin layers contain a compatibilizer, whereby a gas barrier resin is used when the packaging container produced by using the laminate of the present invention is heated and melted and recycled. And the polyethylene resin are uniformly mixed, and it is possible to effectively prevent the physical properties from being deteriorated. In addition, it is possible to effectively prevent the transparency from being lowered.

As the compatibilizer, conventionally known ones can be appropriately selected and used, but from the viewpoint of recyclability, unsaturated carboxylic acid-modified polyolefin resin is preferable, and maleic anhydride-modified polyethylene resin is more preferable.

The content of the compatibilizer in the first and second polyolefin resin layers is preferably 5% by mass or more and 30% by mass or less.
The above effect can be further improved by setting the content of the compatibilizer in the first and second polyolefin resin layers to 5% by mass or more.
By setting the content of the compatibilizer in the first and second polyolefin resin layers to 30% by mass or less, the strength and heat resistance of the base material can be improved.

As long as the characteristics of the present invention are not impaired, the first and second polyethylene resin layers may contain a resin material other than the polyolefin resin, for example, (meth) acrylic resin, vinyl resin, cellulose resin, polyamide resin. , Polyethylene resin, ionomer resin and the like.
From the viewpoint of recycling suitability, the first and second polyolefin resin layers are particularly preferably free of resins other than polyethylene resin.

In addition, the first and second polyethylene resin layers can contain the above additives as long as the characteristics of the present invention are not impaired.

The thickness of the first and second polyolefin resin layers is preferably 5 μm or more and 100 μm or less, and more preferably 10 μm or more and 50 μm or less. By setting the thickness of the polyolefin resin layer to 5 μm or more, the strength and heat resistance of the laminate of the present invention can be improved. By setting the thickness of the polyolefin resin layer to 100 μm or less, the processability of the laminate of the present invention can be improved.

The configurations of the first and second polyolefin resin layers may be the same or different.

(Barrier coat layer)
The laminate of the present invention may further include a barrier coat layer on the vapor-deposited film (between the first sealant layer and the vapor-deposited film, or between the vapor-deposited film and the substrate). Thereby, the gas barrier property of the laminated body can be improved.

In one embodiment, the barrier coat layer is a polyamide resin such as ethylene-vinyl alcohol copolymer (EVOH), polyvinyl alcohol, polyacrylonitrile, nylon 6, nylon 6,6 and polymethoxylylen adipamide (MXD6), polyester. It is composed of a resin, a polyurethane resin, and a gas barrier resin such as a (meth) acrylic resin.

The thickness of the barrier coat layer is preferably 0.01 μm or more and 10 μm or less, and more preferably 0.1 μm or more and 5 μm or less.
By setting the thickness of the barrier coat layer to 0.01 μm or more, the gas barrier property can be further improved. By setting the thickness of the barrier coat layer to 10 μm or less, the processability of the vapor-deposited base material 20 can be improved. Further, it can be a vapor-deposited base material 20 that can be suitably used for manufacturing a monomaterial packaging container.

The barrier coat layer can be formed by dissolving or dispersing the above-mentioned material in water or a suitable solvent, applying the material, and drying the material.

In another embodiment, the barrier coat layer is a metal alkoxide obtained by polycondensing a mixture of a metal alkoxide and a water-soluble polymer by a sol-gel method in the presence of a sol-gel method catalyst, water, an organic solvent, or the like. A gas barrier coating film containing at least one resin composition such as a hydrolyzate of the above or a hydrolyzed condensate of a metal alkoxide.
By providing such a barrier coat layer on the vapor-deposited film, it is possible to effectively prevent the occurrence of cracks in the vapor-deposited film.

In one embodiment, the metal alkoxide is represented by the following general formula.
R ¹ _n M (OR ² ) _m
(However, in the formula, R ¹ and R ² each represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, and m represents an integer of 1 or more. , N + m represents the valence of M.)

As the metal atom M, for example, silicon, zirconium, titanium, aluminum and the like can be used.
Examples of the organic group represented by R ¹ and R ² include alkyl groups such as methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group and i-butyl group. Can be done.

Examples of the metal alkoxide satisfying the above general formula include tetramethoxysilane (Si (OCH ₃ ) ₄ ), tetraethoxysilane (mass%) Si (OC ₂ H ₅ ) ₄ ), and tetrapropoxysilane (Si (OC ₃ H)). ₇ ) ₄ ), tetrabutoxysilane (Si (OC ₄ H ₉ ) ₄ ) and the like can be mentioned.

Further, it is preferable to use a silane coupling agent together with the above metal alkoxide.
As the silane coupling agent, known organic reactive group-containing organoalkoxysilanes can be used.

As the water-soluble polymer, polyvinyl alcohol and ethylene-vinyl alcohol copolymer are preferable, and from the viewpoint of oxygen barrier property, water vapor barrier property, water resistance and weather resistance, it is preferable to use these in combination.

The thickness of the gas barrier coating film is preferably 0.01 μm or more and 10 μm or less, and more preferably 0.1 μm or more and 5 μm or less. Thereby, the gas barrier property can be further improved.
By setting the thickness of the gas barrier coating film to 0.01 μm or more, the oxygen barrier property and the water vapor barrier property of the barrier laminate can be improved. In addition, it is possible to prevent the occurrence of cracks in the vapor-deposited film.
By setting the thickness of the gas barrier coating film to 10 μm or less, the vapor-deposited base material 20 can be suitably used for producing a monomaterial packaging container.

The gas barrier coating film is prepared by applying a composition containing the above materials by a conventionally known means such as a roll coating such as a gravure roll coater, a spray coating, a spin coating, dipping, a brush, a bar code, and an applicator, and the composition thereof. The product can be formed by polycondensing the product by the sol-gel method.
As the sol-gel method catalyst, an acid or amine compound is suitable.

The composition may further contain an acid. The acid is used as a catalyst for the sol-gel method, mainly as a catalyst for hydrolysis of alkoxides, silane coupling agents and the like.
As the acid, mineral acids such as sulfuric acid, hydrochloric acid and nitric acid, and organic acids such as acetic acid and tartaric acid are used.

Moreover, the said composition may contain an organic solvent. As the organic solvent, for example, methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butanol and the like can be used.

Hereinafter, an embodiment of a method for forming a gas barrier coating film will be described below.
First, a composition is prepared by mixing a metal alkoxide, a water-soluble polymer, a sol-gel method catalyst, water, an organic solvent and, if necessary, a silane coupling agent. The polycondensation reaction gradually proceeds in the composition.
Next, the composition is applied and dried on the thin-film deposition film 21 by the above-mentioned conventionally known method. By this drying, the polycondensation reaction of the alkoxide and the water-soluble polymer (and the silane coupling agent if the composition contains a silane coupling agent) further proceeds to form a layer of the composite polymer. Finally, by heating, a gas barrier coating film can be formed.

(Packaging container)
The packaging container of the present invention is characterized by being made of the above-mentioned laminate.

Specific examples of the packaging container of the present invention include a laminated tube, a packaging bag, and a lid material.

(Laminate tube)
In one embodiment, the packaging container of the present invention is a laminated tube 40.
Hereinafter, the laminated tube 40 of the present invention will be described with reference to the drawings. FIG. 6 is a diagram simply showing the configuration of the laminated tube 40, and FIG. 7 is a cross-sectional view taken along the line aa of FIG. As shown in FIG. 6, the laminate tube 40 includes a laminate tube main body 41 including a head portion 42 and a body portion 43, and the body portion 43 is characterized by being composed of the laminate 30.

(head)
The head portion 42 includes a shoulder portion 44 connected to one end of the body portion 43 and an extraction port portion 45 connected to the shoulder portion 44.
Further, in one embodiment, the spout portion 45 includes a screw strip 47 for screwing the cap 46.

In one embodiment, the head 42 is made of polyethylene resin, which can improve the recyclability of the laminated tube. As the polyethylene resin, a high-density polyethylene resin, a medium-density polyethylene resin, a low-density polyethylene resin, a linear low-density polyethylene resin, and an ultra-low-density polyethylene resin can be used.
Among these, high-density polyethylene resin is preferable from the viewpoint of shape retention.
Further, as the polyethylene resin, a polyethylene resin derived from biomass or a polyethylene resin recycled by mechanical recycling or chemical recycling can be used.
The head 42 may contain the above-mentioned additive as long as the specification of the present invention is not impaired.

The method for producing the head 42 is not particularly limited, and the head 42 can be produced by a conventionally known method. For example, the head 42 can be manufactured by a compression molding method (compression molding method) or an injection molding method (injection molding method), and can be joined to the body portion.

When manufacturing a laminated tube 40 by using a compression molding method (compression molding method), after mounting the body 43 on a male mold having a convex portion at the upper part, the male mold and the female mold are opposed to each other, and the male mold and the female mold are opposed to each other. By supplying a material such as molten polyethylene resin and compression molding to form the head portion 42 and joining the head portion 42 to one opening of the body portion 43, the laminated tube 40 composed of the head portion 42 and the body portion 43 can be formed. Can be manufactured.
Further, when the laminated tube 40 is manufactured by an injection molding method (injection molding method), the body 43 is attached to a male mold having a convex portion at the upper part, and then the male mold and the female mold are opposed to each other and melted from the gate. A laminated tube composed of a head portion 42 and a body portion 43 is manufactured by supplying a material such as polyethylene resin obtained from the above, injection molding the head portion 42, and joining the head portion 42 to one opening of the body portion 43. Can be done.

(Torso)
In the laminated tube main body 41 of the present invention, the body portion 43 is connected to the shoulder portion 44 of the head portion 42.
The body portion 43 is formed by rolling the laminate 30 into a cylindrical shape, superimposing the first sealant layer 31 and the second sealant layer 32, and heat-sealing the overlapped portion. Can be obtained by forming.
Further, the body portion 43 includes a bottom seal portion 49 formed by heat-sealing the opening of the rolled laminate 30.

As a heat sealing method, a conventionally known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal, and a flame seal can be used.

(cap)
The laminated tube 40 can include a cap 46.
The cap is detachably attached to the extraction port of the head and plays a role of closing the extraction port.
The cap is made of a thermoplastic resin.
Examples of the thermoplastic resin include polyolefin resins such as polyethylene and polypropylene, polyester, cellulose resin, vinyl resin and the like, but polyethylene resin is particularly preferable from the viewpoint of recyclability.
Further, the cap 46 may contain the above-mentioned additive as long as the characteristics of the present invention are not impaired.

As shown in FIG. 6, the cap may be of a screw type having a concave groove on the inner surface of the cap 46 so as to be screwed into the thread 47 of the extraction port 45, and the cap 47 may be of the screw type. It may be a plug type that is fitted by plugging in.

In one embodiment, the packaging container of the present invention is a packaging bag.
As a packaging bag, for example, standing pouch type, side seal type, two-way seal type, three-way seal type, four-way seal type, envelope-attached seal type, gassho-attached seal type (pillow-seal type), fold-attached seal type, flat-bottom seal type. , Various types of packaging bags such as a square bottom seal type and a gusset type.

In one embodiment, as shown in FIG. 8, the packaging container of the present invention is a packaging bag 50 in which two laminates are bonded together (the shaded area is a heat-sealed portion).

The packaging bag 50 having the form shown in FIG. 8 is manufactured by preparing two laminated bodies 30 and stacking the laminated bodies 30 so that the first sealant layer 31 faces each other and heat-sealing the three sides. can do.

In one embodiment, as shown in FIG. 9, the packaging container of the present invention is a standing pouch type packaging bag 60 (hereinafter, simply referred to as a standing pouch 60), and the standing pouch 60 has a body portion 61 and a bottom portion. 62 and.
The body 61 of the standing pouch 60 is made of a laminated body 30.
Further, the bottom portion 62 may also be made of the laminated body 30. With such a configuration, the gas barrier property of the standing pouch 60 can be further improved.

The body portion 61 can be formed by making a bag so that the first sealant layer 31 included in the base material and the laminate 30 is the innermost layer.
In another embodiment, first, two laminated bodies 30 are prepared, and these are laminated so that the first sealant layer 31 faces each other. Next, two V-shaped laminates 30 are inserted from both ends of the laminated laminate 30 so that the first sealant layer 31 is on the outside, and heat-sealed to form a standing pouch. The body portion 61 of 60 can be formed. According to such a manufacturing method, the stand pouch 60 having a body portion with a side gusset can be obtained.
Further, the bottom portion 62 can be formed by inserting the laminated body 30 between the bag-made body portions 61 and heat-sealing the laminate 30. More specifically, the laminate 30 is formed by folding it in a V shape so that the first sealant layer 31 is on the outside, inserting it between the bag-made body portions 61, and heat-sealing it. be able to.

Further, as shown in FIG. 8, the packaging container may be provided with the easy-opening means 71.
Examples of the easy-opening means 71 include a notch portion 72 which is a starting point of tearing and a half-cut wire 73 formed by laser processing or a cutter as a path for tearing, as shown in FIG.

Further, as shown in FIG. 9, the packaging container may be provided with the steam venting mechanism 80. When the steam pressure in the packaging container exceeds a predetermined value, the steam bleeding mechanism 80 communicates the inside and the outside of the packaging container to release the steam, and at the same time, the steam is released at a place other than the steam bleeding mechanism 80. It is configured to suppress.
The steam bleeding mechanism 80 includes a steam bleeding seal portion 80a protruding from the side seal portion toward the inside of the packaging container, and a non-seal portion 80b isolated from the contents accommodating portion by the steam bleeding seal portion 80a.
The non-seal portion 80b communicates with the outside for easy packaging. By heating the packaging container in which the contents are filled and the opening is heat-sealed by a microwave oven or the like, the internal pressure is increased and the steam-sealed portion 80a is peeled off. The steam passes through the peeled portion of the steam seal 80a and the non-sealed portion 70b, and escapes to the outside of the packaging container.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples.
The materials used in the following examples are as follows.
-Polyethylene resin A: manufactured by Dow Chemical, ELITE5538G, MDPE, density 0.941 g / cm ³ , melting point 129 ° C, MFR 1.3 g / 10 min
-Polyethylene resin B: manufactured by Dow Chemical, ELITE5960G, HDPE, density 0.962 g / cm ³ , melting point 134 ° C., MFR 0.85 g / 10 min
-Polyethylene resin C: manufactured by Prime Polymer Co., Ltd., SP2520, m-C6-LLDPE, density 0.925 g / cm ³ , melting point 122 ° C., MFR 1.9 g / 10 min
-Polyethylene resin D: manufactured by Dow Chemical, Affinity PL1880G, m-C8-LLDPE, density 0.902 g / cm ³ , melting point 99 ° C, MFR 1.0 g / 10 min
-Olefin-based elastomer resin A: manufactured by Dow Chemical, INFUSE9100, olefin-based block copolymer (with polyethylene as a hard block and α-olefin-based elastomer resin as a soft block), density 0.877 g / cm ³ , melting point 120 ° C., MFR 1.0g / 10min
-Olefin-based elastomer resin B: Mitsui Chemicals, Inc., Toughmer A-4085S, α-olefin copolymer, density 0.885 g / cm ³ , melting point 66 ° C., MFR 3.6 g / 10 min

Example 1-1
A mixture of polyethylene resin A and olefin-based elastomer resin A (blending ratio 8: 2 (mass basis)) and polyethylene resin A are coextruded into two layers by the inflation method, and then in the longitudinal (MD) direction. Forming a vapor-deposited film that is stretched 5 times and includes a first polyethylene resin layer 11 composed of a mixture of polyethylene resin A and an olefin-based elastomer resin, and a second polyethylene resin layer 12 composed of polyethylene resin A. A base material 10 for use was prepared.
In the thin-film deposition film forming base material 10, the thickness of the first polyethylene resin layer 11 was 2 μm, and the thickness of the second polyethylene resin layer 12 was 23 μm.

An aluminum vapor-deposited film having a thickness of 30 nm was formed on the first polyethylene resin layer 11 of the thin-film film-forming base material 10 prepared as described above by the PVD method to prepare the thin-film film-forming base material 20.
The optical density (OD value) of the formed thin-film film was measured and found to be 3.0.

Examples 1-2-1-5 and Comparative Example 1-1
A thin-film deposition film forming base material 10 and a thin-film deposition base material 20 were produced in the same manner as in Example 1-1, except that the configuration of the first polyethylene resin layer 11 was changed as shown in Table 1.

<< Laminate strength evaluation >>
The polyethylene resin C was extruded into a single-layer film by an inflation method to obtain an unstretched polyethylene resin film having a thickness of 100 μm.
This unstretched polyethylene resin film is used as the first sealant layer 31 on a two-component film 21 provided on the vapor-deposited base material 20 obtained in Examples 1-1 to 1-5 and Comparative Example 1-1. A laminated body 30 was produced by laminating via a curable urethane adhesive (RU-004 / H-1 manufactured by Rock Paint Co., Ltd.).

The laminate 30 produced as described above was cut into strips having a width of 15 mm to obtain test pieces.
The peeling force between the vapor-deposited film 21 and the first polyethylene resin layer 11 in this test piece conforms to JIS K 6854-2 using a tensile tester (Tensilon universal material tester manufactured by Orientec Co., Ltd.). And measured. The measurement results are shown in Table 1.
The peeling speed was 50 mm / min and the peeling angle was 180 °.

Example 2-1
Mixture of polyethylene resin A and olefin-based elastomer resin A (blending ratio 8: 2 (mass standard)), mixture of polyethylene resin A and polyethylene resin A and olefin-based elastomer resin A (blending ratio 8: 2 (mass standard)) Is coextruded into a three-layer coextruded film by an inflation method, then stretched five times in the longitudinal (MD) direction to form a first polyethylene resin layer 11 composed of a mixture of polyethylene resin A and an olefin-based elastomer resin. , A vapor deposition film forming base material 10 comprising a second polyethylene resin layer 12 made of polyethylene resin A and a third polyethylene resin layer 13 made of a mixture of polyethylene resin A and an olefin-based elastomer resin. Was produced.
In the vapor deposition film forming base material 10, the thickness of the first polyethylene resin layer 11 was 2 μm, the thickness of the second polyethylene resin layer 12 was 21 μm, and the thickness of the third polyethylene resin layer 13 was 2 μm. ..

An aluminum vapor-deposited film having a thickness of 30 nm was formed on the first polyethylene resin layer 11 of the thin-film film-forming base material 10 prepared as described above by the PVD method to prepare the thin-film film-forming base material 20.
The optical density (OD value) of the formed thin-film film was measured and found to be 3.0.

Examples 2-2-2-5 and Comparative Example 2-1
In the same manner as in Example 2-1 except that the configurations of the first polyethylene resin layer 11 and the third polyethylene resin layer 13 were changed as shown in Table 2, the vapor deposition film forming base material 10 and the vapor deposition group were formed. Material 20 was produced.

<< Laminate strength evaluation >>
The polyethylene resin C was extruded into a single-layer film by an inflation method to obtain an unstretched polyethylene resin film having a thickness of 100 μm.
This unstretched polyethylene resin film is used as the first sealant layer 31 on the vapor-deposited film 21 provided by the vapor-deposited substrate 20 obtained in Examples 2-1 to 2-5 and Comparative Example 2-1. A laminated body 30 was produced by laminating via a curable urethane adhesive (RU-004 / H-1 manufactured by Rock Paint Co., Ltd.).

The laminate 30 produced as described above was cut into strips having a width of 15 mm to obtain test pieces.
The peeling force between the vapor-deposited film 21 and the first polyethylene resin layer 11 in this test piece conforms to JIS K 6854-2 using a tensile tester (Tensilon universal material tester manufactured by Orientec Co., Ltd.). And measured. The measurement results are shown in Table 2.
The peeling speed was 50 mm / min and the peeling angle was 180 °.

Example 3-1
A mixture of polyethylene resin A and olefin elastomer resin A (blending ratio 8: 2 (mass basis)) is single-layer extruded by the inflation method, and then stretched 5 times in the longitudinal (MD) direction to form polyethylene. A base material 10 for forming a vapor deposition film made of a first polyethylene resin layer 11 composed of a mixture of the resin A and the olefin-based elastomer resin A was prepared.
In the thin-film deposition film forming base material 10, the thickness of the first polyethylene resin layer 11 was 25 μm.

An aluminum vapor-deposited film having a thickness of 30 nm was formed on the first polyethylene resin layer 11 of the thin-film film-forming base material 10 prepared as described above by the PVD method to prepare the thin-film film-forming base material 20.

Examples 3-2-3-5 and Comparative Example 3-1
A thin-film deposition film forming base material 10 and a thin-film deposition base material 20 were produced in the same manner as in Example 3-1 except that the structure of the first polyethylene resin layer 11 was changed as shown in Table 3.

<< Laminate strength evaluation >>
The polyethylene resin C was extruded into a single-layer film by an inflation method to obtain an unstretched polyethylene resin film having a thickness of 100 μm.
This unstretched polyethylene resin film is used as the first sealant layer 31 on a two-component film 21 provided on the vapor-deposited base material 20 obtained in Examples 3-1 to 3-5 and Comparative Example 3-1. A laminated body 30 was produced by laminating via a curable urethane adhesive (RU-004 / H-1 manufactured by Rock Paint Co., Ltd.).

The laminate 30 produced as described above was cut into strips having a width of 15 mm to obtain test pieces.
The peeling force between the vapor-deposited film 21 and the first polyethylene resin layer 11 in this test piece conforms to JIS K 6854-2 using a tensile tester (Tensilon universal material tester manufactured by Orientec Co., Ltd.). And measured. The measurement results are shown in Table 3.
The peeling speed was 50 mm / min and the peeling angle was 180 °.

Example 4-1
A mixture of polyethylene resin A and olefin-based elastomer resin A (blending ratio 8: 2 (mass basis)), polyethylene resin A and polyethylene resin D are prepared from a mixture of polyethylene resin A and olefin-based elastomer resin A by an inflation method. Co-extruded into a three-layer tubular shape consisting of a layer (outer layer) composed of a layer (outer layer), a layer composed of polyethylene resin A (intermediate layer), and a layer composed of polyethylene resin C (inner layer). ,
Next, the inner layers composed of the polyethylene resin D are pressure-bonded with a rubber roll, and the first polyethylene resin layer 11 composed of a mixture of the polyethylene resin A and the olefin-based elastomer resin A, polyethylene. A second polyethylene resin layer 12 composed of resin A, a third polyethylene resin layer 13 composed of polyethylene resin D, a fourth polyethylene resin layer 14 composed of polyethylene resin A, and polyethylene resin A and an olefin system. A film having a five-layer structure including a fifth polyethylene resin layer 15 composed of a mixture with the elastomer resin A was obtained.
This film was stretched 5 times in the longitudinal (MD) direction to prepare a base film 10 for forming a vapor-deposited film.
In the vapor deposition film forming base material 10, the thickness of the first polyethylene resin layer 11 is 2 μm, the thickness of the second polyethylene resin layer 12 is 9.3 μm, and the thickness of the third polyethylene resin 13 is 2.4 μm. The thickness of the fourth polyethylene resin layer 14 was 9.3 μm, and the thickness of the fifth polyethylene resin 15 was 2 μm.

An aluminum vapor-deposited film having a thickness of 30 nm was formed on the first polyethylene resin layer 11 of the thin-film film-forming base material 10 prepared as described above by the PVD method to prepare the thin-film film-forming base material 20.
The optical density (OD value) of the formed thin-film film was measured and found to be 3.0.

Examples 4-2 to 4-5 and Comparative Example 4-1
The structure of the first polyethylene resin layer 11 and the fifth polyethylene resin layer 15 was changed as shown in Table 4, and the base material 10 for forming a vapor-deposited film and the vapor-deposited group were formed in the same manner as in Example 4-1. Material 20 was produced.

<< Laminate strength evaluation >>
The polyethylene resin C was extruded into a single-layer film by an inflation method to obtain an unstretched polyethylene resin film having a thickness of 100 μm.
Using this unstretched polyethylene resin film as the first sealant layer 31, the vapor-deposited film 21 provided on the vapor-deposited base material 20 obtained in Examples 4-1 to 4-4 and Comparative Examples 4-1 to 4-2. , A laminated body 30 was prepared by laminating with a two-component curable urethane adhesive (RU-004 / H-1 manufactured by Rock Paint Co., Ltd.).

The laminate 30 produced as described above was cut into strips having a width of 15 mm to obtain test pieces.
The peeling force between the vapor-deposited film 21 and the first polyethylene resin layer 11 in this test piece conforms to JIS K 6854-2 using a tensile tester (Tensilon universal material tester manufactured by Orientec Co., Ltd.). And measured. The measurement results are shown in Table 4.
The peeling speed was 50 mm / min and the peeling angle was 180 °.

10: Substrate for forming a vapor deposition film, 11: 1st polyethylene resin layer, 12: 2nd polyethylene resin layer, 13: 3rd polyethylene resin layer, 14: 4th polyethylene resin layer, 15: 5th Polyethylene resin layer, 20: vapor deposition base material, 21: vapor deposition film, 30: laminate, 31 first sealant layer, 32: second sealant layer, 40: laminate tube, 41: laminate tube body, 42: head , 43: Body, 44: Shoulder, 45: Outlet, 46: Cap, 47: Screw, 48: Welded, 49: Bottom Seal, 50: Packaging Bag, 60: Standing Pouch, 61: Body Part, 62: Bottom, 71: Easy-opening means, 72: Notch, 73: Half-cut wire, 80: Steam bleeding mechanism, 80a: Steam bleeding seal, 80b: Non-sealing,

Claims (18)

A base material for forming a vapor-deposited film, which comprises at least a first polyethylene resin layer on which the vapor-deposited film is formed on the surface.
The first polyethylene resin layer is composed of a polyethylene resin and an olefin-based elastomer resin.
The thin-film deposition film-forming base material is a thin-film deposition film-forming base material that has been subjected to a stretching treatment. The base material for forming a vapor-deposited film according to claim 1, wherein the olefin-based elastomer resin is an ethylene-based elastomer resin. The base material for forming a vapor-deposited film according to claim 1 or 2, wherein the olefin-based elastomer resin is an olefin-based block copolymer. The base material for forming a vapor-deposited film according to claim 3, wherein the olefin-based block copolymer is an ethylene / α-olefin interpolymer. The base material for forming a vapor deposition film according to claim 4, wherein the ethylene / α-olefin interpolymer comprises a hard block made of polyethylene and a soft block made of an α-olefin monomer. The base material for forming a vapor-deposited film according to any one of claims 1 to 5, wherein the content of the olefin-based elastomer resin in the first polyethylene resin layer is 1% by mass or more and 40% by mass or less. The base material for forming a vapor-deposited film according to any one of claims 1 to 6, wherein the density of the polyethylene resin contained in the first polyethylene resin layer is 0.970 g / cm ^{3 or less.} The base material for forming a vapor-deposited film has a multilayer structure and has a multilayer structure.
The thin-film deposition film-forming base material according to any one of claims 1 to 7, wherein each layer constituting the thin-film deposition film-forming base material having a multi-layer structure is made of a polyolefin resin. The base material for forming a vapor-deposited film according to claim 8, wherein the polyethylene resins constituting the adjacent layers have different densities and have a density gradient. The base material for forming a vapor-deposited film according to claim 9, wherein the density difference of the polyethylene resin between the adjacent layers is 0.05 g / cm ^{3 or less.} A vapor-deposited substrate having at least a substrate and a vapor-deposited film.
The base material comprises the base material for forming a vapor-deposited film according to any one of claims 1 to 10.
The thin-film deposition film is provided on the first polyethylene resin layer of the thin-film deposition film-forming base material. A laminate having at least a base material, a vapor-deposited film, and a first sealant layer.
The base material comprises the base material for forming a vapor-deposited film according to any one of claims 1 to 10.
The thin-film deposition film is provided on the first polyethylene resin layer of the base material for forming the thin-film deposition film.
A laminate, wherein the first sealant layer is made of a polyethylene resin. A second sealant layer is further provided on the surface of the base material opposite to the surface on which the first sealant layer is provided.
The laminate according to claim 12, wherein the second sealant layer is made of a polyethylene resin. The laminate according to any one of claims 12 or 13, further comprising a barrier coat layer between the first sealant layer and the vapor-deposited film. The laminate according to any one of claims 12 to 14, which is used for a packaging container. The laminate according to any one of claims 12 to 15, wherein the content of the polyethylene resin in the entire laminate is 80% by mass or more. A packaging container made of the laminate according to any one of claims 12 to 16. The packaging container according to claim 17, which is a laminated tube.

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