JP6805685B2 - Resealable sealant film - Google Patents

Description

The present invention relates to resealable sealant films, laminates, lids, containers, packaging materials and packaging bags. More specifically, a container having a lid material and a bottom material, or a sealant film, a laminate, which can be resealed by pressing a heat-sealed portion after opening a packaging bag using the packaging material once. Regarding lid materials, containers, packaging materials and packaging bags.

Some foods such as ham and potato chips, as well as containers and packaging bags used for various pharmaceutical products, can be opened once and then resealed (hereinafter, also referred to as "resealing"). For example, a laminated film having an adhesive resin layer is used as a container lid material or a packaging material for a packaging bag, and the lid material and the bottom material can be resealed due to the adhesiveness of the adhesive resin layer, or the packaging materials are resealed. There are possible packaging bags.

Regarding a package having a resealing function having an adhesive resin layer, a surface resin layer, an adhesive resin layer, a release resin layer, and a heat seal resin layer are laminated in this order, and the tackifier resin is a styrene-based thermoplastic elastomer. There is a lid material containing a tackifier and a package using the same (Patent Document 1).

Japanese Patent No. 5106795

However, the lid material and the package described in Patent Document 1 have low opening strength after resealing, and particularly low opening strength after repeated opening and resealing. Further, the lid material and the packaging body described in Patent Document 1 require a release resin layer, and the release resin layer may not be sufficient in processability at the time of manufacturing the lid material or the packaging bag.

The present invention advantageously solves the above problems, has a high opening strength after resealing, has a high opening strength even after repeated opening and resealing, and has no problem in practical workability. It is an object of the present invention to provide a film, a laminate, a lid material, a container, a packaging material and a packaging bag.

As a result of intensive research on the sealant film having the adhesive resin layer, the laminate, the lid material, the container, the packaging material and the packaging bag, the inventors have laminated at least the adhesive resin layer and the heat seal layer to form the sealant film. Since the pressure-sensitive adhesive resin layer is a pressure-sensitive resin layer containing a styrene monomer, a styrene block copolymer, and a pressure-sensitive adhesive, the container or packaging bag using the sealant film has an opening strength after resealing. It was found that the opening strength was high even after repeated opening and resealing.

The present invention is based on the above findings.
That is, the resealable sealant film of the present invention is a sealant film having at least an adhesive resin layer and a heat seal layer laminated.
The pressure-sensitive adhesive resin layer is a resin layer containing 10 to 35% by mass of a styrene monomer, 30 to 60% by mass of a styrene block copolymer, and 5 to 60% by mass of a tackifier.

Further, the laminate of the present invention is characterized in that a base material layer is laminated on the side of the pressure-sensitive adhesive resin layer of the resealable sealant film described above via an adhesive layer. Further, the lid material of the present invention is characterized by being made of the above-mentioned laminated body. Further, the container of the present invention includes the above-mentioned lid material and a bottom material that is heat-sealed with the lid material, and the surface layer of the bottom material has a heat-sealing layer of the same type as the heat-sealing layer of the lid material. It is characterized by that. Further, the packaging material of the present invention is characterized by being composed of the above-mentioned laminate. Further, the packaging bag of the present invention is characterized by being made of the above-mentioned packaging material.

According to the present invention, a resealable sealant film, laminate, lid material, container, packaging material and packaging bag having high opening strength after resealing and high opening strength even after repeated opening and resealing can be obtained.

It is a schematic sectional view of one Embodiment of the resealable sealant film of this invention. It is a schematic sectional drawing of one Embodiment of the laminated body of this invention. It is a schematic sectional view of one Embodiment of the container of this invention. It is a schematic cross-sectional view at the time of opening of one Embodiment of the container of this invention. It is a schematic sectional view of one Embodiment of the packaging bag of this invention. It is a schematic cross-sectional view at the time of opening of one Embodiment of the packaging bag of this invention. It is a schematic sectional view of another embodiment of the packaging bag of this invention. It is a schematic cross-sectional view at the time of opening of another embodiment of the packaging bag of this invention.

Hereinafter, embodiments of the resealable sealant film, laminate, lid material, container, and packaging bag of the present invention will be specifically described with reference to the drawings.

[Resealable sealant film]
FIG. 1 shows a schematic cross-sectional view of an embodiment of the resealable sealant film of the present invention. In FIG. 1, the resealable sealant film 1 is made of a multilayer film, and has an adhesive resin layer 2 and a heat seal layer 3 laminated in this order.
The pressure-sensitive adhesive resin layer 2 of the resealable sealant film 1 is a resin layer containing a styrene monomer, a styrene block copolymer, and a pressure-sensitive adhesive.

Since the resealable sealant film 1 does not have a release resin layer, the release resin layer does not cause a decrease in processability during the production of a laminate or a container or packaging bag, and is practically used. Has sufficient workability. Further, in the resealable sealant film 1, since the adhesive resin layer 2 is made of a resin containing a styrene monomer, a styrene block copolymer and a tackifier, the opening strength after resealing is high, and the resealing and resealing are performed. A sealant film having high opening strength can be obtained even if the above steps are repeated.

Further, since the resealable sealant film 1 has a minimum structure of two layers of the adhesive resin layer and the heat seal layer, the thickness of the laminate using the resealable sealant film 1 is relatively thin. Can be made and can be made lighter. Therefore, the resealable sealant film 1 is suitable as a part of the packaging material used for the packaging bag.

The thickness of the resealable sealant film 1 can be appropriately adjusted to the thickness required for the lid material and the packaging material in which the resealable sealant film 1 is used as a part of the laminate, and is about 10 to 100 μm. be able to.

(Adhesive resin layer)
The pressure-sensitive resin layer 2 preferably contains 10 to 35% by mass of the styrene monomer, 30 to 60% by mass of the styrene block copolymer, and 5 to 60% by mass of the pressure-sensitive adhesive. When the styrene monomer, the styrene block copolymer and the tackifier are contained in the above numerical range, particularly high opening strength can be obtained. More preferably, the styrene monomer is 15 to 30% by mass, the styrene block copolymer is 35 to 60% by mass, and the tackifier is 5 to 25% by mass.
The pressure-sensitive adhesive resin layer 2 can contain additives other than the styrene monomer, the styrene block copolymer, and the pressure-sensitive adhesive. For example, an inorganic filler can be included. Blocking can be suppressed by containing an inorganic filler. As the inorganic filler, one or more selected from talc, mica, calcium silicate, glass fiber, calcium carbonate, magnesium carbonate, carbon fiber, barium sulfate, calcium sulfate and the like can be used. The blending amount of the inorganic filler with respect to the pressure-sensitive adhesive resin can be 0.1 to 2.5% by mass.

The styrene block copolymer of the adhesive resin layer 2 is preferably a block copolymer of styrene and other comonomer, and the other comonomer is preferably one selected from isoprene, butadiene and butylene. In the case of isoprene, the styrene block copolymer is a styrene-isoprene-styrene type block copolymer in which styrene is polymerized at both ends of the chain isoprene. Similarly, in the case of butadiene, it is a styrene-butadiene-styrene type block copolymer, and in the case of butylene, it is a styrene-butylene-styrene type block copolymer.

The tackifier for the pressure-sensitive resin layer 2 may be one or more selected from, for example, rosin, rosin hydride, rosin derivative, rosin hydride derivative, rosin ester, polyterpene, phenol terpene and phenol terpene derivative. preferable.

The tackifier of the pressure-sensitive adhesive resin layer 2 preferably has a softening point of 5 to 150 ° C. When the softening point is 5 to 150 ° C., the adhesiveness of the adhesive resin layer 2 can be appropriately adjusted.

The pressure-sensitive adhesive resin containing the above-mentioned styrene monomer, styrene block copolymer, and pressure-sensitive adhesive has a melt flow rate MFR (230 ° C., 2.16 kg) preferably 2 to 100 g / 10 min. More preferably, it is 2 to 50 g / 10 min.
The pressure-sensitive resin containing the above-mentioned styrene monomer, styrene block copolymer and tackifier is preferably having a density of 0.99 to 0.97 g / cm ³ .

Examples of the pressure-sensitive adhesive resin preferably used for the pressure-sensitive adhesive resin layer include the trade name MWW65 of Bostik SA having the above-mentioned component composition.

The thickness of the adhesive resin layer 2 is preferably about 5 to 50 μm. When the thickness is about 5 to 50 μm, the adhesive function can be fully exhibited.

(Heat seal layer)
The heat seal layer 3 is sealed with the bottom material of a container or a packaging bag in which a laminate containing a resealable sealant film (described in detail later) is used as a lid material or a packaging material. It is a layer for sealing between packaging materials. The resin used for the heat seal layer 3, which is a resin layer that can be melted by heat and fused to each other, is preferably an olefin resin, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear). ) Low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene- (meth) ethyl acrylate copolymer, ethylene- (meth) acrylate copolymer, ethylene-propylene copolymer, methylpentene Polyolefin-based resin obtained by modifying a polyolefin-based resin such as a polymer, polyethylene or polypropylene with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic anhydride, fumaric acid or the like, ethylene- (meth) acrylic acid ester-unsaturated carboxylic acid. A resin composed of one or more of the above-mentioned ternary copolymer resin, cyclic polyolefin resin, cyclic olefin copolymer, polyethylene terephthalate (PET), polyacrylonitrile (PAN), and the like can be used.

The resealable sealant film 1 of the present invention is used as a laminate 11 described later as a container lid material or a packaging material for a packaging bag. Therefore, it is preferable that the heat seal layer 3 is an appropriate resin depending on the application, such as being the same resin as the surface layer (seal layer) of the bottom material of the container. From this point of view, the heat seal layer 3 is preferably polyethylene or polypropylene among the above-mentioned olefin resins. Specific examples of polyethylene include low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene. More preferably, it is low density polyethylene or linear low density polyethylene.

Further, as the polypropylene, any of homopolypropylene made of homopolymer, random polypropylene made of random copolymer, and block polypropylene made of block copolymer can be used.

When the resin of the heat seal layer is polyethylene, it is preferable to use one having a melting point of 80 to 120 ° C.

The thickness of the heat seal layer 3 is not particularly limited, but is preferably about 5 to 50 μm. It is preferably 40 μm or less, more preferably 30 μm or less.

(Manufacturing method of resealable sealant film)
The resealable sealant film 1 is obtained by, for example, extruding a pressure-sensitive resin layer 2 and a heat-sealing layer 3 on the surface of an anchor coating agent layer formed on one surface of a base material of a laminate described later by melt coextrusion. Hereinafter, it can also be manufactured by "coextrusion laminate"). By manufacturing by extrusion laminating by melt coextrusion, it is not necessary to form the adhesive resin layer 2 and the heat seal layer 3 individually and then laminate them.

In the production of the resealable sealant film, it is preferable that the surface of the adhesive resin of the adhesive resin layer 2 is coated with an inorganic filler. Since the surface of the adhesive resin is coated with an inorganic filler, blocking can be suppressed. As the inorganic filler, one or more selected from talc, mica, calcium silicate, glass fiber, calcium carbonate, magnesium carbonate, carbon fiber, barium sulfate, calcium sulfate and the like can be used. The blending amount of the inorganic filler with respect to the pressure-sensitive adhesive resin can be 0.5 to 2.5% by mass.

[Laminate]
An embodiment of the laminate of the present invention will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view of an embodiment of the laminate of the present invention. In the illustrated laminate 11, the base material layer 4 is laminated on the side of the adhesive resin layer 2 of the resealable sealant film 1 having the adhesive resin layer 2 and the heat seal layer 3 described above via the adhesive layer 5. ing. The laminate 11 can be used as a lid material for a container or a packaging material for a packaging bag.

(Base layer)
As the base material layer 4, the resin used for the base material of the lid material and the packaging material can be appropriately used. Specifically, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, polyvinyl alcohol, polyacrylonitrile, polycarbonate, ethylene-vinyl acetate copolymer, ionomer, ethylene- (meth) acrylic acid. Copolymer, ethyl ethylene- (meth) acrylate copolymer, ethylene-propylene copolymer, methylpentene, polybutene, acid-modified polyolefin resin, polyamide resin, polystyrene resin, low crystalline saturated polyester or non-polymer Crystalline polyester resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyvinylidene fluoride (PVDF), tetrafluoroethylene-ethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), MXD6, etc. , Cellophane, moisture-proof cellophane and the like can be used.

Among the resin films listed above, polyester resins such as polyethylene terephthalate (hereinafter, also referred to as "PET"), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), and polybutylene terephthalate (PBN); polycapron. Polyester resins such as amide (nylon 6), polyhexamethylene adipamide (nylon 66), poly-p-xylylene adipamide (MXD6 nylon); and polyolefin resins such as polyethylene and polypropylene are preferred. In particular, the PET film is more preferable for the base material layer 4 because it has high transparency, excellent dimensional stability, and excellent heat resistance. The above-mentioned polyester resin, polyamide resin and polyolefin resin may be a mixture thereof.

The base material layer 4 may be a multilayer film in which two or more resin films are laminated. In the case of a multilayer film, each layer may have the same composition or may have a different composition.

These resin films may be non-stretched films, but uniaxially stretched films or biaxially stretched films are preferably used from the viewpoint of transparency and the like. The thickness of the film is not particularly limited, but is about 5 to 500 μm, preferably 5 to 300 μm, and more preferably 10 to 100 μm.

The base material layer 4 may have a laminated structure in which a barrier layer is further laminated on the above resin film layer. By stacking the barrier layers, weight reduction of the contents and deterioration of the contents can be effectively suppressed.

The barrier layer is, for example, a metal foil made of an aluminum foil or the like, a vapor-deposited film of an inorganic substance or an inorganic oxide, a vapor-deposited film having the vapor-deposited film on a resin film, an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, or polyvinyl chloride. It may be a layer made of alcohol, a gas barrier resin such as MXD6, or a combination thereof.

From the viewpoint of ensuring the visibility of food, the barrier layer is preferably transparent, and an inorganic oxide vapor deposition film or an inorganic oxide vapor deposition film having the vapor deposition film provided on a plastic film is particularly preferable. used. The inorganic oxide forming the vapor deposition film may be any inorganic oxide having transparency and gas barrier properties such as oxygen and water vapor, and for example, aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, and oxidation. Oxides such as zirconium, titanium oxide, boron oxide, hafnium oxide, and barium oxide are preferably used, and aluminum oxide and silicon oxide are particularly preferably used from the viewpoint of gas barrier properties, production efficiency, and the like.

The surface of the base material layer 4 may be subjected to a surface treatment for improving wettability such as corona treatment, ozone treatment, and frame treatment in order to improve the adhesiveness. Such surface treatment is applied to the surface of the base material layer 4 on which the adhesive layer 5 is formed.

(Adhesive layer)
The adhesive layer 5 is a layer for adhering the base material layer 4 and the resealable sealant film 1. The adhesive layer 5 is not limited to the adhesive used for dry lamination, and includes an anchor coating agent used for extrusion lamination and a resin that can be adhered to the adhesive resin layer 2 of the sealant film 1. The coating amount of the anchor coating agent used for extrusion lamination has an advantage that it is smaller than the coating amount of the adhesive used for dry lamination. For the adhesive layer 5, for example, a urethane-based adhesive or a urethane-based anchor coating agent can be used. The resin layer that can be adhered to the adhesive resin layer 2 of the sealant film 1 has an interlayer strength with the adhesive resin layer 2 equal to or higher than the interlayer strength between the adhesive resin layer 2 and the heat seal layer 3 in the sealant film 1. It is preferably a certain material.

In the extrusion lamination, a resin that can be adhered to the adhesive resin layer can be melt-extruded between the base film coated with the anchor coating agent and the resealable sealant film 1. For example, polyethylene can be melt-extruded between the base film and the resealable sealant film. As described above, the laminated body 11 can include a resin layer between the adhesive resin layer 2 of the resealable sealant film 1 and the adhesive layer 5.

(Manufacturing method of laminated body)
The laminate 11 can be produced, for example, by laminating each layer of the resealable sealant film 1 described above on the surface of the base film on which the anchor coating agent layer is formed by coextrusion lamination. When the laminate has a barrier layer, it is manufactured by extrusion lamination in which a resin that can be adhered to both films is melt-extruded between the film containing the base material layer and the anchor coating agent layer and the barrier layer film. Can be done.

[Lid material]
An embodiment of the lid material of the present invention will be described with reference to FIG. FIG. 3 is a schematic cross-sectional view of the container 21 having the lid material and the bottom material. The above-mentioned laminated body 11 can be used as the lid material 22 of the container 21 composed of the lid material 22 and the bottom material 23. The lid material 22 is heat-sealed with the heat-sealing layer 24 on the surface layer of the bottom material 23 to seal the container. It is preferable that the heat seal layer 3 of the laminate 11 used for the lid material 22 and the heat seal layer 24 of the surface layer of the bottom material 23 are made of the same type of resin because the opening strength can be increased. For example, the lid material 22 in which the heat seal layer 3 of the laminate 11 is polyethylene is used for a container in which the heat seal layer 24 on the surface layer of the bottom material 23 is polyethylene. Further, the lid material 22 in which the heat seal layer 3 of the laminate 11 is polypropylene is used for a container in which the heat seal layer 24 on the surface layer of the bottom material 23 is polypropylene.

[container]
An embodiment of the container of the present invention will be described with reference to FIG. 3 described above. The container 21 of the present invention includes the lid material 22 of the present invention described above, and the bottom material 23 that is heat-sealed with the lid material 22. The surface layer of the bottom material 23 preferably has a heat seal layer 24 of the same type as the heat seal layer 3 of the lid material 22 described above.

Regarding the container 21 in which the lid material 22 and the bottom material 23 are heat-sealed, when the lid material 22 is opened, the lid material 22 is placed between the adhesive resin layer 2 and the heat seal layer 3 as shown in FIG. To separate. Therefore, the adhesive resin layer 2 of the lid material 22 after opening is exposed as a surface layer. By manually crimping the lid material 22 after opening, the adhesive resin layer 2 adheres to the bottom material 23. Therefore, the lid material 22 and the container 21 have resealability.

The container 21 has excellent opening strength when the lid material 22 is manually crimped after the container 21 is first opened, and then the lid material 22 is opened again (hereinafter, referred to as “first reopening”). The opening strength of the first reopening is 2.0 to 7.0 N / 15 mm.

Further, the container 21 is excellent in opening strength when the lid material 22 is manually crimped after the first reopening and then the lid material 22 is reopened (hereinafter, referred to as "second reopening"). The opening strength of the second reopening is 0.9 to 6.0 N / 15 mm.

Further, the container 21 of the present invention is opened when the lid material 22 is manually crimped after the second reopening and then the lid material 22 is reopened (hereinafter, referred to as "third reopening"). It has excellent strength, and the opening strength of the third reopening is 0.7 to 4.5 N / 15 mm.
The container 21 has a high opening strength for the third reopening, and has a high opening strength even after repeated opening and resealing.

[Packaging material]
An embodiment of the packaging material of the present invention will be described with reference to FIG. The above-mentioned laminate 11 can be used as it is for the packaging material 31. A packaging bag such as a pillow bag can be obtained by using the packaging material 31 to form a bag with the heat-sealing layer on the inner surface and heat-sealing the overlapped heat-sealing layers. Further, by using the packaging material 31 and another packaging material and laminating the heat-sealing layer of the packaging material 31 and the heat-sealing layer of the other packaging material, a packaging bag such as a four-sided bag can be obtained. it can.

[Packaging bag]
An embodiment of the packaging bag of the present invention will be described with reference to FIG. FIG. 5 is a schematic cross-sectional view of the packaging bag 41. The packaging bag 41 is obtained by heat-sealing the heat-sealing layers 3 of the packaging material 31 using the above-mentioned laminate 11. It is preferable that the heat-sealing layers 3 are heat-sealed with each other to seal the packaging bag because the opening strength can be increased by heat-sealing the same type of resin.

When the packaging bag 41 in which the heat-sealing layers 3 are heat-sealed with each other is opened, the adhesive resin layer 2 and the heat-sealing layer 3 of the packaging material 31 are separated as shown in FIG. Therefore, after opening, the adhesive resin layer 2 is exposed as a surface layer. By manually crimping the packaging material 31 after opening, the adhesive resin layer 2 adheres to the separated packaging material 31. Therefore, the packaging material 31 and the packaging bag 41 of the present invention have resealability.

The packaging bag 41 is excellent in opening strength when the packaging bag 41 is first opened, and the opening strength at this time is 2.0 to 30.0 N / 15 mm. Further, the packaging bag 41 is excellent in opening strength when the packaging bag 41 is first opened, then crimped by hand, and then the packaging bag 41 is opened again (hereinafter, referred to as "first reopening"). The opening strength of the first reopening is 1.0 to 8.0 N / 15 mm.

Further, the packaging bag 41 has an opening strength when the packaging bag 41 is manually crimped after the first reopening and then the packaging bag 41 is reopened (hereinafter, referred to as "second reopening"). The opening strength of the second reopening is 1.0 to 7.5 N / 15 mm.

Further, the packaging bag has excellent opening strength when the packaging bag 41 is manually crimped after the second reopening and then the packaging bag 41 is reopened (hereinafter referred to as "third reopening"). The opening strength of the third reopening is 1.0 to 6.0 N / 15 mm.

Further, the packaging bag has excellent opening strength when the packaging bag 41 is manually crimped after the third reopening and then the packaging bag 41 is reopened (hereinafter, referred to as "fourth reopening"). The opening strength of the fourth reopening is 1.0 to 4.5 N / 15 mm.

The packaging bag 41 has a high opening strength for the fourth reopening, and has a high opening strength even after repeated opening and resealing.

FIG. 7 shows another embodiment of the packaging bag of the present invention. In the packaging bag 42 of FIG. 7, a packaging material 31 using the above-mentioned laminate 11 and a packaging material 32 having no adhesive resin layer 2 in the above-mentioned laminate 11 are prepared, and the heat-sealing layer of the packaging material 31 is prepared. 3 and the heat-sealing layer 3 of the packaging material 32 are heat-sealed. As shown in FIG. 8, the packaging bag 42 is separated between the heat-sealing layer 3 of the packaging material 31 and the adjacent adhesive resin layer 2 at the time of opening, so that the packaging material 31 and the packaging material 32 to be heat-sealed are adhesive. It does not have to have the resin layer 2.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

[Example 1]
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one side corona-treated as a base material layer was set in the primary paper feed of an extrusion laminating machine. The corona-treated surface of this base material layer is coated with a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) so as to have a thickness of 0.3 g / m ² (dry state). Heat treatment was performed at 100 ° C. for 2 seconds to form an anchor coating agent layer.

Next, on the surface of the anchor coating agent layer, a styrene block polymer having a thickness of 15 μm as an adhesive resin layer (MWW65 manufactured by Bostik SA, density 0.96 g / cm, ³ styrene monomer 12% by mass, styrene block co-weight) was applied from the T die. 60% by mass of coalescence, 22.5% by mass of tackifier, and 1.2% by mass of inorganic filler in the balance) and linear low-density polyethylene with a thickness of 10 μm as a heat seal layer (melting point 96 ° C., density 0. 927 g / cm ³ ) was co-extruded and laminated to obtain a laminate in which the PET layer / anchor coating agent layer / adhesive resin layer / heat seal layer were laminated in this order. In the laminated body, the thickness of the PET layer was 12 μm, the thickness of the adhesive resin layer was 15 μm, and the thickness of the heat seal layer was 10 μm.

The obtained laminate is folded so that the heat-sealing layers face each other, the heat-sealing layers are overlapped with each other, and heat-sealed under the conditions of a heating temperature of 140 ° C., a pressure of 1 kgf / cm ² , and a sealing time of 1 second. Got

[Example 2]
Example 2 is an example of a packaging bag in which a first laminate having an adhesive resin layer and a second laminate having no adhesive resin layer are heat-sealed, as shown in FIG. 7.
(First laminate)
The first laminated body has the same layer structure, thickness, and manufacturing method as the laminated body of Example 1.
(Second laminate)
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one side corona-treated as a base material layer was set in the primary paper feed of an extrusion laminating machine. The corona-treated surface of this base material layer is coated with a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) so as to have a thickness of 0.3 g / m ² (dry state). Heat treatment was performed at 100 ° C. for 2 seconds to form an anchor coating agent layer.

Next, low-density polyethylene (LDPE; Novatec LC600A manufactured by Japan Polyethylene Corporation) having a thickness of 25 μm was melt-extruded from the T-die on the surface of the anchor coating agent layer at a set temperature of 290 ° C., and the PET layer / A second laminate was obtained in which the anchor coating agent layer and the heat seal layer were laminated in this order. In the second laminate, the PET layer had a thickness of 12 μm and the heat seal layer had a thickness of 25 μm.

(Packaging bag)
The heat-sealing layer of the first laminated body and the heat-sealing layer of the second laminated body are superposed, heat-sealed under the conditions of a heating temperature of 140 ° C., a pressure of 1 kgf / cm ² , and a sealing time of 1 second, and then packaged. I got a bag.

[Example 3]
A laminate and a packaging bag were obtained in the same manner as in Example 1 except that the thickness of the adhesive resin layer of the laminate and the packaging bag of Example 1 was changed to 25 μm and the thickness of the heat seal layer was changed to 15 μm.

[Example 4]
As shown in FIG. 7, Example 4 is an example of a packaging bag in which a first laminate having an adhesive resin layer and a second laminate having no adhesive resin layer are heat-sealed. In comparison with the laminate and packaging bag of Example 2, the thickness of the adhesive resin layer of the first laminate was changed to 25 μm and the thickness of the heat seal layer was changed to 15 μm in the laminate and packaging bag of Example 4. Other than that, it is the same as in Example 2.
(First laminate)
The first laminated body has the same layer structure, thickness, and manufacturing method as the laminated body of Example 3.
(Second laminate)
The second laminate has the same layer structure, thickness, and manufacturing method as the second laminate of Example 2.

The heat-sealing layer of the first laminated body and the heat-sealing layer of the second laminated body are superposed, and heat-sealed under the conditions of a heating temperature of 140 ° C., a pressure of 1 kgf / cm ² , and a sealing time of 1 second to form a packaging bag. Obtained.

[Example 5]
Example 5 is an example in which the laminated body has a barrier layer.
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one side corona-treated as a base material layer was set in the primary paper feed of an extrusion laminating machine. The corona-treated surface of this base material layer is coated with a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) so as to have a thickness of 0.3 g / m ² (dry state). Heat treatment was performed at 100 ° C. for 2 seconds to form an anchor coating agent layer.

Next, an aluminum foil (1N30 manufactured by Toyo Aluminum Co., Ltd.) having a thickness of 7 μm was set in the extrusion laminating machine secondary paper feed as a barrier layer prepared separately from the anchor coating agent layer obtained above, and the laminated film was prepared. Low-density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Co., Ltd.) was melt-extruded from the T-die between the anchor coating agent layer and the aluminum foil so as to have a thickness of 15 μm at 330 ° C. The anchor coating agent layer was sand-laminated via polyethylene as an aluminum foil and an adhesive layer. Next, a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) was applied to the surface of the aluminum barrier layer of the laminated film obtained by the above sand lamination to a thickness of 0.3 g / m ² (drying). The film was coated so as to be in a state) and heat-treated at 90 ° C. for 2 seconds to form an anchor coating agent layer.

Further, on the surface on which the anchor coating agent layer was formed, a styrene block polymer (MWW65 manufactured by Bostik SA, density 0.96 g / cm ³ ) having a thickness of 15 μm as an adhesive resin layer and a thickness as a heat seal layer were added from the T die. 10 μm linear low-density polyethylene (melting point 96 ° C., density 0.927 g / cm ³ ) is melt-coextruded and laminated to form a PET layer / anchor coating agent layer / PE layer / barrier layer / anchor coating agent layer / A laminate was obtained in which the adhesive resin layer and the heat seal layer were laminated in this order. In the laminated body, the thickness of the PET layer was 12 μm, the thickness of the PE layer was 15 mm, the thickness of the aluminum foil was 7 μm, the thickness of the adhesive resin layer was 15 μm, and the thickness of the heat seal layer was 10 μm.

The obtained laminate is folded so that the heat-sealing layers face each other, the heat-sealing layers are overlapped with each other, and heat-sealed under the conditions of a heating temperature of 140 ° C., a pressure of 1 kgf / cm ² , and a sealing time of 1 second. Got

[Example 6]
In Example 6, the laminated body of Example 5 was used as the first laminated body, and the laminated body having a layer structure excluding the adhesive layer from the layer structure of the laminated body of Example 5 was used as the second laminated body. This is an example of a package in which the first laminated body and the second laminated body are heat-sealed.
(First laminate)
The first laminated body has the same layer structure, thickness, and manufacturing method as the laminated body of Example 5.
(Second laminate)
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one side corona-treated as a base material layer was set in the primary paper feed of an extrusion laminating machine. The corona-treated surface of this base material layer is coated with a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) so as to have a thickness of 0.3 g / m ² (dry state). Heat treatment was performed at 100 ° C. for 2 seconds to form an anchor coating agent layer.

Next, an aluminum foil (1N30 manufactured by Toyo Aluminum Co., Ltd.) having a thickness of 7 μm was set as a barrier layer in the secondary paper feed of the extrusion laminating machine, and between the anchor coating agent layer of the laminated film and the aluminum foil. , Low-density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Co., Ltd.) is melt-extruded from the T-die at 330 ° C. to a thickness of 15 μm as an adhesive layer, and the anchor coating agent layer and the aluminum foil are adhered to each other. Sand-laminated through the polyethylene layer of the layer. Next, a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) was added to the aluminum barrier layer of the laminated film obtained by the above sand lamination to a thickness of 0.3 g / m ² (dry state). The coating was carried out at 90 ° C. for 2 seconds to form an anchor coating agent layer.

Further, low-density polyethylene (LDPE; Novatec LC600A manufactured by Japan Polyethylene Corporation) having a thickness of 25 μm is melt-extruded from the T-die on the surface of the anchor coating agent layer at a set temperature of 290 ° C. to form a PET layer / anchor. A laminate was obtained in which the coating agent layer / PE layer / barrier layer / anchor coating agent layer / heat seal layer were laminated in this order. In the laminated body, the thickness of the PET layer was 12 μm, the thickness of the PE layer was 15 μm, the thickness of the aluminum barrier layer was 7 μm, and the thickness of the heat seal layer was 25 μm.

(Packaging bag)
The heat-sealing layer of the first laminated body obtained above and the heat-sealing layer of the second laminated body are superposed, and heat-sealed under the conditions of a heating temperature of 140 ° C., a pressure of 1 kgf / cm ² , and a sealing time of 1 second. And got a packaging bag.

[Example 7]
In Example 7, the heat seal layer is an example of polypropylene.
A laminate and a packaging bag were obtained in the same manner as in Example 1 except that the heat-sealing layer of the laminate and the packaging bag of Example 1 was changed to polypropylene (Prime Polymer Co., Ltd., F329RA, thickness 10 μm).

[Comparative Example 1]
Comparative Example 1 is an example in which the laminate does not have the adhesive resin layer in comparison with Example 1.
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one side corona-treated as a base material layer was set in the primary paper feed of an extrusion laminating machine. The corona-treated surface of this base material layer is coated with a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) so as to have a thickness of 0.3 g / m ² (dry state). Heat treatment was performed at 100 ° C. for 2 seconds to form an anchor coating agent layer.

Next, low-density polyethylene (LDPE; Novatec LC600A manufactured by Japan Polyethylene Corporation) having a thickness of 25 μm was melt-extruded from the T-die on the surface of the anchor coating agent layer at a set temperature of 290 ° C. to form a PET layer. A laminate was obtained in the order of / anchor coating agent layer / heat seal layer. In the laminated body, the thickness of the PET layer was 12 μm, and the thickness of the heat seal layer was 25 μm.

The obtained laminate is folded so that the heat-sealing layers face each other, the heat-sealing layers are overlapped with each other, and heat-sealed under the conditions of a heating temperature of 140 ° C., a pressure of 1 kgf / cm ² , and a sealing time of 1 second. Got

[Comparative Example 2]
Comparative Example 2 is an example in which the laminate does not have the adhesive resin layer in comparison with Example 5.
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one side corona-treated as a base material layer was set in the primary paper feed of an extrusion laminating machine. The corona-treated surface of this base material layer is coated with a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) so as to have a thickness of 0.3 g / m ² (dry state). Heat treatment was performed at 100 ° C. for 2 seconds to form an anchor coating agent layer.

Next, an aluminum foil (1N30 manufactured by Toyo Aluminum Co., Ltd.) having a thickness of 7 μm was set as a separately prepared barrier layer in the secondary paper feed of the extrusion laminating machine, and between the anchor coating agent layer and the aluminum foil. , Low-density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Co., Ltd.) is melt-extruded from the T-die at 330 ° C. to a thickness of 15 μm, and the anchor coating agent layer and the aluminum foil are adhered to each other. Sand-laminated through a layer of polyethylene. Next, a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) was applied to the surface of the aluminum barrier layer of the laminated film obtained by the above sand lamination to a thickness of 0.3 g / m ² (drying). The film was coated so as to be in a state) and heat-treated at 90 ° C. for 2 seconds to form an anchor coating agent layer.

Further, low-density polyethylene (LDPE; Novatec LC600A manufactured by Japan Polyethylene Corporation) having a thickness of 25 μm is melt-extruded from the T-die on the surface of the anchor coating agent layer at a set temperature of 290 ° C. to obtain a PET layer / anchor coating. A laminate was obtained in which the agent layer / PE layer / barrier layer / anchor coating agent layer / heat seal layer were laminated in this order.

The obtained laminate is folded so that the heat seal layers face each other, the heat seals are overlapped with each other, and the packaging bag is heat-sealed under the conditions of a heating temperature of 140 ° C., a pressure of 1 kgf / cm ² , and a sealing time of 1 second. Obtained.

<Recloseability test>
The heat-sealed portion of the packaging bag composed of the laminates of Examples 1 to 7 and Comparative Examples 1 and 2 was cut into strips having a width of 15 mm, and according to JIS K 6854, the tensile speed was 300 mm / min in an atmosphere of 25 ° C. The opening strength of the first time was measured. Since the packaging bag was separated between the adhesive resin layer and the heat seal layer of the packaging material, the opening strength was the interlayer adhesive strength between the adhesive resin layer and the heat seal layer.

After measuring the opening strength for the first time, the heat-sealed portion of the packaging bag was manually crimped. After crimping, the package was opened again (first reopening), and the reopening strength at that time was measured under an atmosphere of 25 ° C. and a tensile speed of 300 mm / min to measure the adhesive strength between the adhesive resin layer of the packaging material and the heat seal layer. This work was repeated with the second reopening, the third reopening, and the fourth reopening, and the strength of each reopening was set.
The results obtained are shown in Table 1.

From Table 1, the packaging bags of Examples 1 to 7 had a performance that was difficult to realize in the past, that is, they still have sufficient recloseability even after being resealed a plurality of times. On the other hand, the packaging bags of Comparative Examples 1 and 2 that did not use the adhesive resin could not be reclosed once opened.

By using the laminate or packaging material of the present invention, for example, the food packaging material can be reclosed with sufficient strength even after it has been opened once, so that the food or the like can be stored for a longer period of time. It will be possible.

[Example 8]
Example 8 is an example in which the composition of the adhesive resin layer is changed.
Except for changing to styrene block polymer (density 0.94 g / cm ³ styrene monomer 20% by mass, styrene block copolymer 40% by mass and tackifier 35% by mass, the rest contains 1.2% by mass of inorganic filler) , A packaging material was prepared in the same manner as in Example 1.
The heat-sealed layer of the obtained laminate and the polyethylene layer of the surface layer of the bottom material are superposed, and a semi-automatic trace sealer M (manufactured by Nakamura Sangyo Co., Ltd.) is used to heat the temperature at 140 ° C. and the pressure at 3 kgf / cm ² . A container was obtained by tray sealing under the condition of a sealing time of 0.5 seconds.
The heat-sealed portion of the obtained container was cut into strips having a width of 15 mm, and the first opening strength was measured at a tensile speed of 300 mm / min in an atmosphere of 25 ° C. according to JIS K 6854. As a result, (15 N / 15 mm). Met. Since the container was separated between the adhesive resin layer of the lid material and the heat seal layer, the opening strength was the interlayer adhesive strength between the adhesive resin layer and the heat seal layer.
After measuring the opening strength for the first time, the heat-sealed portion between the peeled lid material and the bottom material was manually crimped. After crimping, the package was opened again (first reopening), and the reopening strength at that time was measured under an atmosphere of 25 ° C. and a tensile speed of 300 mm / min to measure the adhesive strength between the adhesive resin layer of the lid material and the heat seal layer. This work was repeated with the second reopening, the third reopening, and the fourth reopening, and the strength of each reopening was set.
As a result, the opening strength was 15N / 15mm, the first reopening strength was 6.2N / 15mm, the second reopening strength was 5.1N / 15mm, and the third reopening strength was 3.9N / 15mm. The reopening strength at the second time was 3.3 N / 15 mm.

[Example 9]
Example 9 is an example of a container in which the laminate of Example 1 is used as a lid material and is heat-sealed with a separately prepared bottom material. The surface layer of the bottom material is made of polyethylene and has a thickness of 250 μm.
(Lid material)
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one side corona-treated as a base material layer was set in the primary paper feed. The corona-treated surface of this base material layer is coated with a two-component urethane anchor coating agent (Takelac A3210 / Takenate A3075 manufactured by Mitsui Chemicals, Inc.) so as to have a thickness of 0.3 g / m ² (dry state). Heat treatment was performed at 100 ° C. for 2 seconds to form an anchor coating agent layer.

Next, on the surface of the anchor coating agent layer, a styrene block polymer (MWW65 manufactured by Bostik SA, density 0.96 g / cm ³ ) having a thickness of 15 μm as an adhesive resin layer and a heat seal layer having a thickness of 10 μm were applied from a T die. Linear low-density polyethylene (melting point 96 ° C., density 0.927 g / cm ³ ) was co-extruded and laminated in this order: PET layer / anchor coating agent layer / adhesive resin layer / heat seal layer. A laminate was obtained. In the laminated body, the thickness of the PET layer was 12 μm, the thickness of the adhesive resin layer was 15 μm, and the thickness of the heat seal layer was 10 μm.

The heat-sealed layer of the obtained laminate and the polyethylene layer of the surface layer of the bottom material are superposed, and a semi-automatic trace sealer M (manufactured by Nakamura Sangyo Co., Ltd.) is used to heat the temperature at 140 ° C. and the pressure at 3 kgf / cm ² . A container was obtained by tray sealing under the condition of a sealing time of 0.5 seconds.
The heat-sealed portion of the obtained container was cut into strips having a width of 15 mm, and the first opening strength was measured at a tensile speed of 300 mm / min in an atmosphere of 25 ° C. according to JIS K 6854. As a result, (15 N / 15 mm). Met. Since the container was separated between the adhesive resin layer of the lid material and the heat seal layer, the opening strength was the interlayer adhesive strength between the adhesive resin layer and the heat seal layer.

After measuring the opening strength for the first time, the heat-sealed portion between the peeled lid material and the bottom material was manually crimped. After crimping, the package was opened again (first reopening), and the reopening strength at that time was measured under an atmosphere of 25 ° C. and a tensile speed of 300 mm / min to measure the adhesive strength between the adhesive resin layer of the lid material and the heat seal layer. This work was repeated with the second reopening, the third reopening, and the fourth reopening, and the strength of each reopening was set.

As a result, the opening strength was 15N / 15mm, the first reopening strength was 6.8N / 15mm, the second reopening strength was 5.4N / 15mm, and the third reopening strength was 4.5N / 15mm. The reopening strength at the second time was 3.8 N / 15 mm.

Although the resealable sealant film, laminate, lid material, container, packaging material and packaging bag of the present invention have been specifically described above using the embodiments and examples, the resealable sealant film of the present invention, The laminate, lid material, container, packaging material and packaging bag can be modified in many ways without being limited to the description of these embodiments and examples, without departing from the spirit of the present invention.

1 Resealable sealant film 2 Adhesive resin layer 3 Heat seal layer 11 Laminated body 21 Container 22 Lid material 23 Bottom material 31 Packaging material 32 Packaging material 41 Packaging bag 42 Packaging bag

Claims (10)

A sealant film having at least an adhesive resin layer and a heat seal layer laminated.
The adhesive resin layer is a resin layer containing 10 to 35% by mass of a styrene monomer, 30 to 60% by mass of a styrene block copolymer, and 5 to 60% by mass of a tackifier. Sex sealant film. The styrene block copolymer, a styrene, a block copolymer with other comonomers, said other comonomer, isoprene, resealing sealant of claim 1 Symbol placement is one selected from butadiene and butylene the film. Any one of claims 1 or 2 in which the tackifier is one or more selected from rosin, borohydride, rosin derivative, rosin hydride derivative, rosin ester, polyterpene, phenol terpene and phenol terpene derivative. The resealable sealant film according to paragraph 1. The resealable sealant film according to any one of claims 1 to 3 , wherein the pressure-sensitive adhesive resin layer further contains an inorganic filler. The resealable sealant film according to any one of claims 1 to 4 , wherein the heat seal layer is an olefin resin. A laminate characterized in that a base material layer is laminated on the side of the adhesive resin layer of the resealable sealant film according to any one of claims 1 to 5 via an adhesive layer. A lid material comprising the laminate according to claim 6 . A container comprising the lid material according to claim 7 and a bottom material that is heat-sealed with the lid material, and the surface layer of the bottom material has a heat-sealing layer of the same type as the heat-sealing layer of the lid material. .. A packaging material comprising the laminate according to claim 6 . A packaging bag made of the packaging material according to claim 9 .

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