WO2021124741A1

WO2021124741A1 - Resealable packaging material

Info

Publication number: WO2021124741A1
Application number: PCT/JP2020/042149
Authority: WO
Inventors: 栞小野; 誠悟 ▲吉▼村; 遼治谷川; 康博川取; 渕田　泰司
Original assignee: 共同印刷株式会社
Priority date: 2019-12-20
Filing date: 2020-11-11
Publication date: 2021-06-24

Abstract

A resealable packaging material according to the present invention sequentially comprises a base material layer, an adhesive layer and a heat seal layer in this order; and the adhesive layer contains a thermoplastic elastomer and a polyterpene. At least a part of the heat seal layer is heat sealed to an adherend, and the resealable packaging material is separated from the adherend by pinching another part of the resealable packaging material, thereby breaking the adhesive layer and the heat seal layer and exposing the adhesive layer-side surface of the base material layer in the heat sealed part. Consequently, a resealable part, which is a part of the adhesive layer, is exposed, and the adhesive layer-side surface of the base material layer and the resealable part are able to be adhered to each other by pressing adhesive layer-side surface of the base material layer against the resealable part.

Description

Resealable packaging material

The present invention relates to a resealable packaging material.

As a packaging means for cosmetics and sanitary products that are repeatedly opened and resealed each time they are used, or for foods and pharmaceuticals that cannot be consumed at one time, the contents remaining after opening are conventionally oxidatively deteriorated or absorb moisture. Various packages having a resealing function are used to prevent deterioration due to drying or the like. As such a packaging body, a multilayer film capable of imparting a resealing function to the packaging body itself without attaching an accessory such as a zipper has been proposed.

In Patent Document 1, a surface resin layer (A) composed of two or more layers and a given styrene-based thermoplastic elastomer (b) as main components are contained, but a pressure-sensitive resin layer (B) does not contain a pressure-imparting resin. ) And the heat-sealed resin layer (C) containing the olefin resin (c) as a main component are laminated in the order of (A) / (B) / (C), and the surface resin layer (A) A multilayer film containing an ester resin as a main component in a layer adjacent to the adhesive resin layer (B) and having a total thickness of 1 μm or more and 30 μm or less of the adhesive resin layer (B) and the heat-sealed resin layer (C). The heat-sealed resin layer (C) is heat-sealed at the heat-sealed portion of the body to be sealed, and then the multilayer film is peeled off from the heat-sealed portion. A multilayer film with a resealing function is disclosed, wherein the layer (A) is delaminated and the adhesive resin layer (B) is exposed to the surface resin layer (A) in a resealable state.

Further, in Patent Document 2, the thermoplastic resin layer (A), the pressure-sensitive adhesive resin layer (B), and the heat-sealed resin layer (C) are laminated in the order of (A) / (B) / (C). The heat-sealed resin layer (C) of the resealing film (I) having a multi-layered resin layer, and the heat-sealed resin layer (C) and another heat-sealing film (II) are heat-sealed. Therefore, a resealable bag is disclosed in which the pressure-sensitive adhesive resin layer (B) is exposed in a resealable state at the heat-sealed portion when the heat-sealed portion is peeled off. ..

Japanese Patent No. 4749119 Japanese Unexamined Patent Publication No. 2005-212846

There is a need to provide a new resealable packaging material with good breakability and resealability.

In particular, referring to the aspect of the lid material, when the multilayer film of Patent Document 1 was used as the lid material, the resealability under a normal environment was good. However, when a content that exposes the adhesive layer to a high temperature and high humidity environment is used, the same resealability as in a normal environment may not be obtained.

Further, in solving such a problem, it is desirable that the heat-sealing layer and the adhesive layer can be stably broken in the region where the lid material is heat-sealed, and the adhesive layer in the portion corresponding to this region can be exposed.

Further, referring to the mode of the packaging bag, in Patent Document 2, since it is necessary to design the sealant layer (heat seal layer) thinly, there may be restrictions on the means for manufacturing the packaging bag.

As a result of diligent studies, the present inventors have found that the above problems can be solved by the following means, and have completed the present invention. That is, the present invention is as follows:
<Aspect 1> A base material layer, an adhesive layer, and a heat seal layer are provided in this order.
The adhesive layer contains a thermoplastic elastomer and a polyterpene.
The heat seal layer is a polyethylene resin layer having a density of 0.920 to 0.958 g / cm ^3.
Resealable packaging material
When at least a part of the heat-sealing layer is heat-sealed to the adherend and another part of the resealable packaging material is picked to peel the resealable packaging material from the adherend, the resealable packaging material is peeled off. The adhesive layer and the heat-sealing layer are broken, and the surface of the base material layer on the adhesive layer side is exposed at the heat-sealed portion, whereby the resealing portion that is a part of the adhesive layer is exposed. When the surface of the base material layer on the adhesive layer side is pressed against the resealing portion, the surface of the base material layer on the adhesive layer side and the resealing portion can be adhered to each other.
Resealable packaging material.
<Aspect 2> The resealable packaging material according to Aspect 1, wherein the heat seal layer is a polyethylene resin layer having a density of 0.920 to 0.958 g / cm ^3.
<Aspect 3> The resealable packaging material according to Aspect 2, wherein the polyethylene resin layer is a mixed resin layer of high-density polyethylene and low-density polyethylene.
<Aspect 4> The resealing packaging material according to Aspect 3, wherein the content of the high-density polyethylene in the heat-sealing layer is 50 to 90% by mass based on the total mass of the heat-sealing layer.
<Aspect 5> The re-described according to any one of aspects 1 to 4, wherein the base material layer includes a base material resin layer, and the base material resin layer is in direct contact with the adhesive layer. Sealing packaging material.
<Aspect 6> The resealable packaging material according to any one of aspects 1 to 5, wherein the thermoplastic elastomer is a styrene-based thermoplastic elastomer.
<Aspect 7> The resealing packaging material according to any one of aspects 1 to 6, wherein the styrene-based thermoplastic elastomer is a styrene-butadiene-butylene-styrene copolymer.
<Aspect 8> The resealable packaging material according to any one of aspects 1 to 7, wherein the pressure-sensitive adhesive layer has a thickness of 7 μm or less.
<Aspect 9> A resealable lid material composed of the resealable packaging material according to any one of aspects 1 to 8.
<Aspect 10> A lid material forming laminate having a resealable lid material according to a plurality of aspects 9 and a surplus portion between the resealable lid materials.
<Aspect 11> A container having a storage portion and a flange portion,
The contents contained in the container and the resealable lid material according to the ninth aspect, which is heat-sealed at the flange portion of the container and thereby seals the container. A container with a lid containing things.
<Aspect 12> The container with a lid containing the contents according to Aspect 11, wherein at least the flange portion of the container is a paper cup coated with a polyethylene resin.
<Aspect 13> A resealable packaging bag having the resealable packaging material according to any one of claims 1 to 8.

According to the present invention, it is possible to provide a resealable packaging material having good breakability and resealability.

In particular, according to one aspect of the present invention, it is possible to provide a resealable packaging material having good breakability and resealability even after the peeled surface is exposed to water vapor.

Further, according to one aspect of the present invention, it is possible to provide a resealable packaging material that can be manufactured without restrictions of the heat seal layer.

FIG. 1 is a schematic view of an embodiment of a resealable lid material and a container with a lid of the present invention. FIG. 1A shows a top view of the container with a lid, and FIG. 1B shows a cross-sectional view taken along the line Ib-Ib of FIG. 1A. FIG. 2 is a diagram showing a peeling mechanism of one embodiment of the resealable lid material of the present invention. FIG. 3 is a diagram showing a laminate for forming a lid material of the present invention. FIG. 4 is a schematic view of one aspect of the resealable packaging bag of the present invention. FIG. 4A shows a top view of one embodiment of the resealable packaging bag of the present invention, and FIG. 4B shows a cross-sectional view taken along the line IVb-IVb of FIG. 4A. FIG. 4 (c) shows a cross-sectional view taken along the line IVc-IVc of FIG. 4 (a). FIG. 5 is a diagram showing a peeling mechanism of one aspect of the resealable packaging bag of the present invention.

《Resealable packaging material》
The resealable packaging material of the present invention is
It has a base material layer, an adhesive layer and a heat seal layer in this order.
The adhesive layer contains a thermoplastic elastomer and a polyterpene.
Resealable packaging material
When at least a part of the heat-sealing layer is heat-sealed to the adherend and another part of the resealable packaging material is picked to peel the resealable packaging material from the adherend, the resealable packaging material is peeled off. The adhesive layer and the heat-sealing layer are broken, and the surface of the base material layer on the adhesive layer side is exposed at the heat-sealed portion, whereby the resealing portion that is a part of the adhesive layer is exposed. When the surface of the base material layer on the adhesive layer side is pressed against the resealing portion, the surface of the base material layer on the adhesive layer side and the resealing portion can be adhered to each other.
It is a resealable packaging material.

Here, in the present invention, the "adhesive body" is an object for heat-sealing the resealable packaging material via the heat-seal layer. For example, when the resealable packaging material is a lid material, the adherend is a container to which the lid material is adhered. Further, the adherend may be another part of the resealable packaging material or another resealable packaging material.

The heat seal layer is preferably a polyethylene resin layer having a density of 0.920 to 0.958 g / cm ^{3 from the viewpoint of improving film forming property and easiness of breaking.}

It is preferable that this polyethylene resin layer is a mixed resin layer of high-density polyethylene and low-density polyethylene from the viewpoint of improving film-forming property and easiness of breaking.

According to the above configuration, the resealing packaging material of the present invention has a depth less than the thickness of the resealing packaging material from the half-cut line, that is, the surface of the resealing packaging material, particularly the surface on the heat seal layer side. It can be satisfactorily broken without providing a notch formed by the sheath, especially along a region intended to be heat-sealed with an adherend.

More specifically, when the resealable packaging material is peeled off from the adherend by pinching the other part of the resealable packaging material that is heat-sealed to the adherend with at least a part of the heat seal layer. , The heat-sealed layer and the adhesive layer are broken, and the surface of the base material layer on the adhesive layer side is exposed at the heat-sealed portion.

In this way, the resealing portion that is a part of the adhesive layer is exposed, and when the surface of the base material layer on the adhesive layer side is pressed against the resealing portion, the surface of the base material layer on the adhesive layer side and the resealing portion are formed. Can stick to each other.

Since the above-mentioned structure, particularly the adhesive layer, contains the thermoplastic elastomer and polyterpen, good resealing property can be obtained even after the resealing portion is exposed to a high temperature and high humidity environment.

Hereinafter, each component of the present invention will be described.

<Base layer>
The base material layer may be a layer including a base material resin layer. Specifically, the base material layer may be a single base material resin layer, or may be a laminate including the base material resin layer. In any aspect, it is preferable that the base resin layer is in direct contact with the adhesive layer from the viewpoint of adhesiveness. Here, in the present specification, "direct contact" means that they are in contact without passing through another layer, for example, an adhesive layer or the like.

When the base material layer is a laminate including the base material resin layer, the base material layer may have a barrier layer, a paper layer, another resin layer, an adhesive layer, and the like in addition to the base material resin layer. The base material layer of this embodiment may have, for example, a paper layer, an adhesive layer, a barrier layer, an adhesive layer, and a base material resin layer in this order, or another resin layer, an adhesive layer, a barrier layer, and adhesion. The layer and the base resin layer may be provided in this order.

(Base resin layer)
As the base resin layer, for example, a thermoplastic resin such as a polyolefin resin, a vinyl polymer, a polyester, or a polyamide can be used alone or in combination of two or more in a plurality of layers. Such a thermoplastic resin can be used in the form of a film or an extruded resin. Further, the film may be a stretched film or a non-stretched film.

Above all, it is preferable to use a polyester resin as the base resin layer from the viewpoint of harmonizing the delamination property and the adhesiveness between the base resin layer and the adhesive layer.

As the polyolefin resin, for example, a polyethylene resin or a polypropylene resin can be used.

In the present specification, the polyethylene-based resin is a resin containing a repeating unit of an ethylene group in the main chain of a polymer in an amount of more than 50 mol%, 60 mol% or more, 70 mol% or more, or 80 mol% or more, for example, low density. Co-polyethylene (LDPE), high density polyethylene (HDPE), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethylacrylate copolymer (EEA), ethylene-methylacrylate It is selected from the group consisting of polymers (EMA), derivatives thereof, and mixtures thereof.

In the present specification, the polypropylene-based resin is a resin containing a repeating unit of a propylene group in the main chain of a polymer in an amount of more than 50 mol%, 60 mol% or more, 70 mol% or more, or 80 mol% or more, for example, polypropylene (PP). Examples include homopolymers, random polypropylene (random PP), block polypropylene (block PP), chlorinated polypropylene, acid-modified polypropylene, derivatives thereof, and mixtures thereof.

Examples of the vinyl polymer include polyvinyl chloride (PVC) and the like.

Examples of polyester include polyethylene terephthalate (PET) and polybutylene terephthalate.

Examples of the polyamide include nylon such as nylon (registered trademark) 6 and nylon MXD6.

Further, the resin layer may include other layers such as an inorganic vapor-deposited layer, a barrier coat layer, and an adhesive layer. As the inorganic material vapor deposition layer, a silica vapor deposition film, an aluminum vapor deposition film, an alumina vapor deposition film, or a silica / alumina vapor deposition film can be used. As the barrier coat layer, a vinylidene chloride coat layer and a polyvinylidene fluoride coat layer can be used.

(Barrier layer)
As the barrier layer, for example, an inorganic vapor-deposited layer, a metal foil layer, an organic coat layer, or the like can be used.

As the inorganic material vapor deposition layer, for example, a silica vapor deposition film, an aluminum vapor deposition film, an alumina vapor deposition film, or a silica / alumina vapor deposition film can be used.

As the metal foil layer, for example, a metal foil such as aluminum foil, copper foil, or titanium foil, or an alloy foil such as aluminum alloy foil or stainless steel foil can be used.

As the organic coating layer, for example, a vinylidene chloride coat layer or a polyvinylidene fluoride coat layer can be used.

When an inorganic vapor-deposited film or an organic coat layer is used as the barrier layer, the thickness of the barrier layer must be 100 nm or more, 200 nm or more, 300 nm or more, 500 nm or more, 700 nm or more, or 1 μm or more to ensure strength and barrier properties. It is preferable from the viewpoint of improving the handleability as a lid material, and it is preferable that the thickness is 5 μm or less, 4 μm or less, 3 μm or less, or 2 μm or less.

When a metal foil layer is used as the barrier layer, the thickness of the barrier layer is preferably 3 μm or more, 5 μm or more, 7 μm or more, 10 μm or more, or 15 μm or more, preferably from the viewpoint of ensuring strength and barrier properties, and 100 μm. Hereinafter, it is preferable that the thickness is 80 μm or less, 60 μm or less, 55 μm or less, 50 μm or less, 45 μm or less, 40 μm or less, or 35 μm or less from the viewpoint of improving the handleability as a lid material.

(Paper layer)
The paper layer may be, for example, a layer facing the outside of the lid material. As the paper layer, coated paper, art paper, or the like may be used. Further, the paper layer may be printed by gravure printing, flexographic printing, or the like.

(Other resin layer)
The other resin layer may be, for example, a resin layer facing the outside of the lid material. As such a resin layer, the resins mentioned for the base resin layer can be used.

(Adhesive layer)
The adhesive layer is an optional adhesive layer that can exist between the above layers constituting the base material layer. The adhesive layer may be, for example, a dry laminate adhesive, a hot melt adhesive, a water-soluble adhesive, an emulsion adhesive, a non-solvent laminate adhesive, a thermoplastic resin for extrusion lamination, or the like.

<Adhesive layer>
The adhesive layer contains a thermoplastic elastomer and a polyterpene. According to this adhesive layer, the adhesive layer can provide good resealability even after the peeled surface is exposed to water vapor.

The content of the thermoplastic elastomer in the adhesive layer may be 30% by mass or more, 35% by mass or more, 40% by mass or more, or 45% by mass or more, and 70% by mass or less, based on the total mass of the adhesive layer. , 65% by mass or less, 60% by mass or less, or 55% by mass or less.

The content of polyterpen in the adhesive layer may be 30% by mass or more, 35% by mass or more, 40% by mass or more, or 45% by mass or more, and 70% by mass or less, 65% by mass, based on the total mass of the adhesive layer. It may be mass% or less, 60 mass% or less, or 55 mass% or less.

The thickness of the adhesive layer is preferably 7 μm or less, 6 μm or less, or 5 μm or less from the viewpoint of obtaining good breakability, and 1 μm or more, 2 μm or more, or 3 μm or more is sufficient for resealing. It is preferable from the viewpoint of obtaining sex.

The adhesive layer can be obtained, for example, by applying a composition obtained by mixing a thermoplastic elastomer and a polyterpen to the base resin layer of the base layer by a coating means. As the coating means, for example, coating with a dry laminator, gravure printing, offset printing, flexographic printing, silk printing and the like can be used.

(Thermoplastic elastomer)
In general, a thermoplastic elastomer is a material that can be fluidized and molded at a high temperature and exhibits rubber elasticity at room temperature. As the thermoplastic elastomer, for example, an olefin-based thermoplastic elastomer, a styrene-based thermoplastic elastomer, or the like can be used.

Examples of the olefin-based thermoplastic elastomer include ethylene-propylene copolymer (EPM), ethylene-butene copolymer (EBM), ethylene-octene copolymer, ethylene-propylene-butene copolymer, and propylene-butene copolymer. Combined, ethylene-propylene-diene copolymer (EPDM) and the like can be mentioned. Further, a blend type olefin-based thermoplastic elastomer in which an olefin-based rubber (EPM, EPDM, etc.) is dispersed in a matrix of an olefin-based resin (for example, polypropylene, polyethylene, etc.) can also be mentioned.

Examples of the styrene-based thermoplastic elastomer include styrene-ethylene-butene copolymer (SEB), styrene-ethylene-propylene copolymer (SEP), styrene-ethylene-butene-styrene copolymer (SEBS), and styrene-ethylene. -Propine-styrene copolymer (SEPS), styrene-ethylene-ethylene-propylene-styrene copolymer (SEEPS), styrene-butadiene-butylene-styrene copolymer (partially hydrogenated styrene-butadiene-styrene copolymer; SBBS), partially hydrogenated styrene-isoprene-styrene copolymer, partially hydrogenated styrene-isoprene butadiene-styrene copolymer and the like can be mentioned.

(Polyterpen)
Polyterpene means an organic compound having isoprene as a basic skeleton in its molecular structure. As the polyterpen, a commercially available polyterpen as a "polyterpen" can be used, for example, Sylvares TRA25, TRB115, TR1115T, TR7115, TRM1115, TR7125, TRB125 of Clayton (registered trademark). The same TR1135, the same TR90, the same TR105 and the like can be used.

<Heat seal layer>
The heat-sealing layer is an adhesive layer when at least a part thereof is heat-sealed to the adherend and another part of the resealable packaging material is picked to peel the resealable packaging material from the adherend. And a layer capable of breaking the heat seal layer.

The heat seal layer may be composed of the above-mentioned polyolefin resin, and may be a resin film commercially available as an easy peel film.

In one aspect, when the heat-sealing layer is ^{a polyethylene resin layer having a density of 0.920 to 0.958 g / cm 3} , it can be provided with film-forming property, ease of breaking, and heat-sealing property.

It is preferable that this polyethylene resin layer is a mixed resin layer of high-density polyethylene and low-density polyethylene from the viewpoint of improving film forming property and easiness of breaking. Whether or not the polyethylene resin layer is a mixed resin layer of high-density polyethylene and low-density polyethylene is determined by, for example, a curve obtained by differential scanning calorific value measurement (DSC) for the mixed resin layer, and each polyethylene constituting the mixed resin layer. It can be confirmed by comparing with the curve obtained with respect to.

In the present invention, the density may be a value measured according to JIS K7112-1999. The density of the heat seal layer, 0.920 g / cm ³ or more, 0.923 g / cm ³ or more, 0.925 g / cm ³ or more, 0.927 g / cm ³ or more, 0.930 g / cm ³ or more, 0.933 g / cm ³ or more, or 0.935 g / cm ³ or more is may be also 0.952 g / cm ³ or less, 0.950 g / cm ³ or less, or 0.948 g / cm ³ may be less. When the polyethylene resin layer is a mixed resin layer of high-density polyethylene and low-density polyethylene, the above density may be a weighted average in which the density of each polyethylene is weighted by the content of each polyethylene. ..

In this specification, "-or more" and "-or less" indicate numerical ranges including boundary values, respectively. That is, "-or more" and "-or less" mean "-or more" and "-or less", respectively.

The content of high-density polyethylene in the heat-sealing layer may be 50% by mass or more, 55% by mass or more, 60% by mass or more, or 65% by mass or more, and 90% by mass, based on the total mass of the heat-sealing layer. % Or less, 85% by mass or less, 80% by mass or less, or 75% by mass or less.

The content of low-density polyethylene in the heat-sealed layer may be 10% by mass or more, 15% by mass or more, 20% by mass or more, or 25% by mass or more, and 50% by mass, based on the total mass of the heat-sealing layer. % Or less, 45% by mass or less, 40% by mass or less, or 35% by mass or less.

The thickness of the heat seal layer may be, for example, 1 μm or more, 2 μm or more, or 3 μm or more. The thickness is preferably 30 μm or less, 25 μm or less, 20 μm or less, 15 μm or less, 10 μm or less, 7 μm or less, 6 μm or less, or 5 μm or less from the viewpoint of easiness of breakage and heat sealability.

The heat seal layer can be obtained, for example, by extruding and laminating a resin composition obtained by kneading high-density polyethylene and low-density polyethylene on an adhesive layer.

(High density polyethylene)
In the present specification, high-density polyethylene contains, in the case of having a branched chain, a repeating unit of methylene group of 80 mol% or more, 90 mol% or more, 95 mol% or more, or 98 mol% or more, including the branching difference, or substantially. Refers to polyethylene having a density of 0.942 g / cm ^{3 or more, in which all repeating units are methylene groups.} This is especially, 0.942 g / cm ³ or more, 0.945 g / cm ³ or more, 0.948 g / cm ³ or more, 0.950 g / cm ³ or more, 0.952 g / cm ³ or more, or 0.955 g / cm ^It has a density of 3 or more, does not substantially have a long-chain branched structure, and is obtained by radical polymerization of ethylene by a low-pressure method. This density, 0.970 g / cm ³ or less, 0.967 g / cm ³ or less, 0.965 g / cm ³ or less, 0.962 g / cm ³ or less, or 0.960 g / cm ³ may be less.

As a preferable thermal property of high-density polyethylene, for example, its melt mass flow rate was measured in accordance with JIS K6922-1 and -2 and JIS K7210-1 under the conditions of a temperature of 190 ° C. and a load of 21.18 N. In some cases, it is preferably 0.1 g / 10 min or more, 0.5 g / 10 min or more, 1.0 g or more, 3.0 g / 10 min or more, or 5.0 g / 10 min or more, 100 g / 10 min or less, 50 g / 10 min or less. , 30 g / 10 min or less, or 20 g / 10 min or less.

(Low density polyethylene)
In the present specification, low-density polyethylene (LDPE) contains 80 mol% or more, 90 mol% or more, 95 mol% or more, or 98 mol% or more, or substantially all of the repeating units of methylene groups, including branched chains. Refers to polyethylene having ^{a density of less than 0.930 g / cm 3} and having a methylene group as the repeating unit.

The density of low density polyethylene, 0.925 g / cm ³ or less, or 0.923 g / cm ³ may be less, also 0.870 g / cm ³ or more, 0.875 g / cm ³ or more, 0.880 g / cm ³ or more, 0.900 g / cm ³ or more, 0.910 g / cm ³ or more, or may be 0.915 g / cm ³ or more.

The low-density polyethylene may be so-called linear low-density polyethylene (LLDPE), or may have a long-chain or short-chain branched structure. The short-chain branched structure is composed of α-olefins having 4 to 18, 4 to 10 or 4 to 8 carbon atoms, such as 1-butene, 1-hexene, 4-methylpentene-1, 1-octene and the like. It may be a branched structure from which it is derived.

As a preferable thermal property of low density polyethylene, for example, its melt mass flow rate was measured in accordance with JIS K6922-1 and -2 and JIS K7210-1 under the conditions of a temperature of 190 ° C. and a load of 21.18 N. In some cases, it is preferably 0.1 g / 10 min or more, 0.5 g / 10 min or more, 1.0 g or more, 3.0 g / 10 min or more, or 5.0 g / 10 min or more, 100 g / 10 min or less, 50 g / 10 min or less. , 30 g / 10 min or less, or 20 g / 10 min or less.

《Resealable lid material》
The resealable lid material of the present invention is a resealable lid material composed of the resealable packaging material of the present invention.

More specifically, as shown in FIG. 1, the resealable lid material 100 of the present invention is
The base material layer 102, the adhesive layer 104, and the heat seal layer 106 are provided in this order.
The adhesive layer 104 contains a thermoplastic elastomer and a polyterpen.
The heat seal layer 106 is a polyethylene resin layer having a density of 0.920 to 0.958 g / cm ^3.

According to the above configuration, the resealable lid material of the present invention has a depth less than the thickness of the resealable lid material from the half cut line, that is, the surface of the resealable lid material, particularly the surface on the heat seal layer side. It can be broken satisfactorily without providing a notch formed in the lid, particularly along a region intended to be heat-sealed with the container, that is, a region serving as a flange seal portion.

More specifically, when the tab 110 of the resealable lid material 100 joined to the flange portion 202 of the container 200 is picked up by the flange seal portion 202a and the resealable lid material 100 is pulled up, FIG. As shown, the heat seal layer 106 and the adhesive layer 104 are broken at a position corresponding to the outer periphery of the flange seal portion 202a, and the broken portion 120a corresponding to this position is exposed. When the resealing lid material 100 is further pulled up, the lid material is peeled off at the interface between the base material layer 102 and the adhesive layer 104, and subsequently, when the position corresponding to the inner circumference of the flange seal portion 202a is reached, heat is generated. The seal layer 106 and the adhesive layer 104 are broken, and the broken portion 120b corresponding to this position is exposed.

In this way, the resealing portion 104a, which is a part of the adhesive layer 104, is exposed, and when the base material layer 102 is pressed against the resealing portion 104a, the resealing portion 104a can be resealed.

According to the above configuration, good resealing property can be brought about even after the resealing portion 104a is exposed to a high temperature and high humidity environment.

In the resealable lid material, the thickness of the heat seal layer may be, for example, 1 μm or more, 2 μm or more, or 3 μm or more. The thickness is preferably less than 10 μm, 7 μm or less, 6 μm or less, or 5 μm or less from the viewpoint of easiness of breaking and heat sealability.

<< Laminated body for forming lid material >>
As shown in FIG. 3, the lid material forming laminate of the present invention has a plurality of the above-mentioned resealable lid materials 100, and a surplus portion 400 between the plurality of resealable lid materials 100. The surplus portion 400 is made of the same laminated body as the laminated body constituting the resealing lid material 100.

The lid material forming laminate can be, for example, a roll-shaped or sheet-shaped laminate having a plurality of the above-mentioned lid materials. The layer structure of this laminated body can be the layer structure described with respect to the lid material described above.

The lid material of the present invention can be produced by cutting or punching the laminate for forming the lid material into the shape of the lid material.

《Container with lid containing contents》
The container with a lid containing the contents of the present invention
Containers with storage and flanges,
It comprises the contents contained in the container, as well as the resealable lid material described above, which is heat-sealed at the flange of the container and thereby seals the container.

<container>
The container is a container having a storage portion and a flange portion.

The container is not particularly limited as long as the lid material can be heat-sealed. As the container, for example, a paper container whose surface is coated with a resin, a resin container, or the like can be used, and in particular, at least the flange portion of the container may be a paper cup coated with a polyethylene resin. preferable.

The lid material of the present invention having a heat-sealing layer which is a polyethylene resin layer having a density of 0.920 to 0.958 g / cm ³ is heat-sealed with a paper cup whose flange portion is coated with polyethylene resin to form a container and the present invention. A constant sealing strength can be obtained between the resealable lid material and the heat-sealing layer of the lid material, and the heat-sealing layer and the adhesive layer of the lid material of the present invention are broken and smooth at the interface between the base material layer and the adhesive layer. Can be peeled off.

(Storage part)
The storage part is a part where the contents are stored. The shape of this portion can be, for example, a substantially conical trapezium, a polygonal pyramid trapezium, a rectangular parallelepiped shape, a cube shape, or the like.

(Flange part)
The flange portion is a peripheral portion of the storage portion of the container, and may be a flange-shaped portion. The shape of the outer circumference of the flange portion can be selected according to the shape of the lid material.

<Contents>
The contents are the contents housed in the storage unit. Examples of such contents include heated foods such as soups, instant noodles, chilled foods and frozen foods, and non-heated foods such as snack foods and gummy candies. In particular, when a heated food is used as the content, steam is generated through heating, so that the application of the present invention is particularly beneficial.

《Resealable packaging bag》
The resealable packaging bag of the present invention is a resealable packaging bag having the resealable packaging material of the present invention.

The resealable packaging bag may be composed of one of the above-mentioned resealable packaging materials, or may be composed of two, three, or four or more of the above-mentioned resealing packaging materials. Further, the resealable packaging bag may be composed of one of the above-mentioned resealable packaging materials and one, two or three or more other films.

In the resealable packaging bag of the present invention, at least a part of the heat-sealing layer of the resealable packaging material is heat-sealed to the adherend, and the other part of the resealable packaging material is pinched to obtain the adherend. The adhesive layer and the heat-sealing layer can be broken by peeling the resealing packaging material from the material. That is, in any of the above embodiments, the resealable packaging material of the present invention is present in the portion of the heat-sealed portion that is intended to be broken.

The resealable packaging bag may be in the form of, for example, a 3-way seal bag, a 4-way seal bag, a pillow bag, a gusset bag, a standing pouch, or the like.

Hereinafter, the resealable packaging bag of the present invention in the form of a pillow bag will be described with reference to FIGS. 4 and 5.

More specifically, as shown in FIG. 4, the resealable packaging bag 600 of the present invention is
The base material layer 602, the adhesive layer 604, and the heat seal layer 606 are provided in this order.
The adhesive layer 604 contains a thermoplastic elastomer and a polyterpene.

In this resealable packaging bag 600, the heat seal layers 606 are heat-sealed at the back seal portion 620 and the two side seal portions 610 so as to face each other, thereby forming a space inside the bag.

The resealable packaging bag of the present invention can be manufactured without restrictions of the heat seal layer while having good breakability and resealability. That is, the heat seal layer 606 may be composed of the above-mentioned polyolefin-based resin, and may be a resin film commercially available as an easy peel film. The resealable packaging bag of the present invention can have good breakability and resealability even when such a heat-sealing layer is used.

More specifically, as shown in FIG. 5 (a), a part of the resealable packaging bag 600 joined to each other at the side seal portion 610, for example, the back portion shown in FIG. 4 (b). When the seal portion 620 and the portion facing the seal portion 620 are pinched with both hands and the resealable packaging bag 600 is pulled, as shown in FIG. 5 (b), the heat seal is formed at the position corresponding to the side seal portion 210. The layer 606 and the adhesive layer 604 are broken, and the

broken portions

630a and 630b corresponding to this position are exposed.

In this way, the resealing portion 604a, which is a part of the adhesive layer 604, is exposed, and when the base material layer 602 is pressed against the resealing portion 604a, it can be resealed.

According to the above configuration, good resealing property can be brought about even after the resealing portion 604a is exposed to a high temperature and high humidity environment.

When the heat seal layer 606 is a polyethylene resin layer having a density of 0.920 to 0.958 g / cm ³ , a mixed resin layer of high-density polyethylene and low-density polyethylene, the film-forming property and breakage are easy. Can be made better. Therefore, this aspect may be preferable when the resealing packaging material of the present invention and another film are heat-sealed at the above-mentioned location where the breakage is intended.

In the resealable packaging bag, the thickness of the heat seal layer may be, for example, 1 μm or more, 2 μm or more, or 3 μm or more, 5 μm or more, 7 μm or more, 10 μm or more, 12 μm or more, or 15 μm or more. This thickness is preferably 30 μm or less, 25 μm or less, or 20 μm or less from the viewpoint of easiness of breaking and heat sealability.

The present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

<< Preparation of lid material and container with lid >>
<Example 1-1>
We prepared the materials shown below:
Paper (basis weight: 79.1 g / m ² ): NM Art, Nippon Paper Co., Ltd. Aluminum foil (7 μm): 1N30, UACJ Co., Ltd. Foil Dry Laminate Adhesive: Takelac A-525 / Takenate A-52, Mitsui Chemicals PET Co., Ltd. (Thickness: 12 μm): PETB, Unitika Co., Ltd. Adhesive layer: SBBS (N515, Asahi Kasei Co., Ltd.) 50% by mass and Polyterpen (Sylvares TRB115, Clayton) 50% by mass mixed resin Heat seal layer: HDPE ( Novatec (registered trademark) HD HJ490, Nippon Polyethylene Co., Ltd., density 0.958 g / cm ³ ) 70% by mass and LDPE (Suntech (registered trademark) LD L2340, Asahi Kasei Co., Ltd., density 0.923 g / cm ³ ) 30% by mass Mixed resin

The lid material obtained in this example has a layer structure of paper (basis weight: 79.1 g / m ² ) // aluminum foil (7 μm) // PET (12 μm) / adhesive layer / heat seal layer (however, “/”. / ”Represented a dry laminate adhesive).

1. Using a dry laminator, aluminum foil "1N30" as a barrier layer and PET film "PETB" as a base resin layer are passed through a dry laminate adhesive "Takelac A-525 / Takenate A-52" as an adhesive layer. And adhered to obtain a member a (aluminum foil (7 μm) // PET (12 μm)) as a base material layer.

2. Using a dry laminator, the aluminum foil side of the member a and the paper "NM Art" as a paper layer are bonded via the dry laminate adhesive "Takelac A-525 / Takenate A-52" as an adhesive layer. A member b (paper (basis weight: 79.1 g / m ² ) // aluminum foil (7 μm) // PET (12 μm)) as a base material layer was obtained.

3. 3. The above mixed resin as an adhesive layer is applied to the PET film "PETB" side of the member b so that the thickness of the adhesive layer is 4 μm, and the member c (paper (basis weight: 79.1 g / m ^2). ) // Aluminum foil (7 μm) // PET (12 μm) / Adhesive layer) was prepared.

4. A mixed resin as a heat seal layer is extruded and laminated on the adhesive layer of the member c so as to have a thickness of 5 μm, and the member d as a laminate constituting the lid material (paper (basis weight: 79.1 g /)). m ² ) // aluminum foil (7 μm) // PET (12 μm) / adhesive layer / heat seal layer) was obtained.

5. The member d was cut out in a diamond shape to prepare the lid material of Example 1-1.

6. The prepared lid material was heat-sealed in a PE-coated paper cup (flange width: 3 mm, opening inner diameter: 90 mm) using a heated heat-seal bar under the conditions of a heat-seal width of 3 mm, a pressure of 65 Mpa, and a time of 0.7 seconds. It was a container with a lid.

Further, in order to evaluate the initial interlayer strength and the resealing peeling strength mentioned below, the above member d was cut into a rectangle having a width of 15 mm × 150 mm, and this was used as an evaluation laminate.

<Comparative Example 1-1>
4. above. In the same manner as in Example 1-1, except that the following was changed, a lid material and a container with a lid of Comparative Example 1-1 were obtained:
An LDPE film (thickness 15 μm, density 0.918 g / cm ³ ) as a heat seal layer is directly laminated on the adhesive layer of the member c, and the member d1 (paper (basis weight)) as a laminate constituting the lid material is laminated. : 79.1 g / m ² ) // Aluminum foil (7 μm) // PET (12 μm) / Adhesive layer / Heat seal layer) was obtained.

<Comparative Example 1-2>
As a heat seal layer, HDPE (Novatec® HD HJ490, Nippon Polyethylene Co., Ltd., density 0.958 g / cm ³ ) 90% by mass and LDPE (Suntech® LD L2340, Asahi Kasei Co., Ltd., density) with a thickness of 10 μm 0.923 g / cm ³ ) In the same manner as in Comparative Example 1-1, except that a mixed resin of 10% by mass was used and SBBS (N515, Asahi Kasei Co., Ltd.) was used instead of the mixed resin as the adhesive layer. A lid material and a container with a lid of Comparative Example 1-2 were obtained.

<Comparative Example 1-3>
A lid material and a container with a lid of Comparative Example 1-3 were obtained in the same manner as in Comparative Example 1-2, except that the adhesive layer was repeatedly applied twice so as to have a thickness of 10 μm.

《Evaluation》
<Initial interlayer strength>
The above evaluation laminate was heat-sealed on a polyethylene film under the conditions of a temperature of 150 ° C., a pressure of 3 kgf / cm ^{2, and a time of 1.5 seconds.} Next, the portion corresponding to the heat-sealed portion was peeled by 180 ° using a measuring machine (Strograph VES1D, Toyo Seiki Seisakusho Co., Ltd.) under the conditions of 300 mm / min and a peeling length of 35 mm, and heat-sealed at this time. The initial interlayer strength between the base material layer and the adhesive layer was calculated by calculating the average peel strength at the peel length of 10 to 30 mm of the portion corresponding to the portion.

<Reseal peeling strength in a 50 ° C environment>
With respect to the sample for which the initial interlayer strength was calculated, the base material layer and the adhesive layer were overlapped and reciprocated once with a 2 kg roller to apply a load in the thickness direction of the evaluation laminate to make the base material layer an adhesive layer. When the adhesive layer was peeled from the base material layer from the short side to the long side by 180 ° under the conditions of 300 mm / min and a peeling length of 35 mm in an environment of a temperature of 50 ° C. The resealing peeling strength was determined by calculating the average peeling strength at a peeling length of 10 to 30 mm.

<Resealability after hot water supply>
The prepared container with a lid was opened until 1/3 of the flange of the container was exposed, and boiling water at 90 ° C. was poured into the container. Next, the base material layer and the adhesive layer were overlapped and resealed by pressing with a finger. The measurement was performed for 5 minutes from the time of resealing, and it was visually observed whether or not the lid material was opened during that period.

The evaluation criteria are as follows:
〇: The lid material did not open for 5 minutes from the time of resealing.
X: The lid material was opened within 5 minutes from the time of resealing.

<Breakability>
The prepared container with a lid was opened, and it was visually observed whether or not the heat seal layer and the adhesive layer were broken at the positions corresponding to the flange seal portion after opening.

The evaluation criteria are as follows:
〇: The heat seal layer and the adhesive layer were broken at the positions corresponding to the flange seal portion.
X: At the position corresponding to the flange seal portion, the heat seal layer and the adhesive layer were not stably broken, and a part of the layer remained beyond this position.

Table 1 shows the configurations and evaluation results of Examples and Comparative Examples.

From Table 1, it can be understood that the lid material of the example had good initial interlayer strength, resealing peeling strength in an environment of 50 ° C., resealing property after hot water supply, and breakability.

On the other hand, the lid materials of Comparative Examples 1-2 to 1-3 in which the adhesive layer did not contain polyterpen had good breakability, but had initial interlayer strength and reseal peeling strength in an environment of 50 ° C. , And the resealing property after hot water supply was not good.

Further, the lid material of Comparative Example 1-1 using a polyethylene resin layer having a density of 0.918 g / cm ^{3 as the heat seal layer did not have good breakability.}

<< Preparation of resealable packaging bag >>
<Example 2-1>
We prepared the materials shown below:
Base material layer: Ny Bonil ON25, Kojin Film & Chemicals Co., Ltd. Adhesive layer: SBBS (N515, Asahi Kasei Co., Ltd.) 50% by mass and Polyterpen (Sylvares TRB115, Clayton Co., Ltd.) 50% by mass mixed resin Heat seal layer: Unstretched polypropylene (Pyren, Toyobo Co., Ltd.)

The packaging bag obtained in this example had a layer structure of a base material layer / adhesive layer / heat seal layer.

1. The above-mentioned mixed resin as the pressure-sensitive adhesive layer was applied to the base material layer so that the thickness of the pressure-sensitive adhesive layer was 3 μm to obtain a member a (base material layer / pressure-sensitive adhesive layer).

2. Next, unstretched polypropylene as a heat-sealing layer was laminated on the adhesive layer of the member a to obtain a member b (base material layer / adhesive layer / heat-sealing layer) as a laminate constituting the packaging bag.

3. The produced member b is cut into a rectangle of 168 mm × 200 mm, heat-sealed with the heat-sealing layers on the short side facing each other to form a back seal portion, and the side portion is heat-sealed to form a pillow of 148 mm × 95 mm. A bag was made. The heat seal was performed using FA-300-10W (Fuji Impulse Co., Ltd.) under the conditions of a seal width of 10 mm, a seal time of 1.0 second, and a cooling time of 2.0 seconds.

Further, in order to evaluate the initial interlayer strength and the resealing peeling strength mentioned below, the above member b was cut into a rectangle having a width of 15 mm × 150 mm, and this was used as an evaluation laminate.

<Examples 2-2 to 2-5 and comparative examples>
Packaging bags of Examples 2-2 to 2-5 and Comparative Examples were prepared in the same manner as in Example 2-1 except that the composition of each layer was changed as shown in Table 2. Details of the substrate layers mentioned in Table 2 are as follows:
PET: Polyethylene terephthalate (E5200, Toyobo Co., Ltd.)
OPP: Stretched polypropylene (Fimax)

<Resealability as a packaging bag>
The prepared packaging bag is opened by pulling the back seal portion and the portion facing the back seal portion, and the heat-sealed portions are resealed by pressing them with fingers together with each other and then reopened to reopen the packaging bag. The resealing property was evaluated sensory. The evaluation criteria are as follows:
〇: I felt resistance to my fingers when I opened it again.
X: No resistance was felt on the fingers when the package was opened again.

Table 2 shows the configurations and evaluation results of Examples and Comparative Examples. In Table 2, the items marked with "*" are not measured in concrete values, but as a result of qualitative evaluation in which peeling is performed by hand, it is shown that there is no problem in practical use. Means.

From Table 2, it can be understood that the packaging bags of Examples 2-1 to 2-5 had good initial interlayer strength, resealing peeling strength, and resealing property.

100

Resealable lid material

102, 602

Base material layer

104, 604

Adhesive layer

104a, 604a Reseal

part

106, 606 Heat seal layer 110

Tab

120a, 120b, 630a, 630b Break part 200 Container 202 Flange part 202a Flange seal part 250 Contents 300 Container with lid containing contents 400 Surplus part 500 Laminated material for forming lid material 600 Resealable packaging bag 610 Side seal part 620 Back seal part

Claims

It has a base material layer, an adhesive layer and a heat seal layer in this order.
The adhesive layer contains a thermoplastic elastomer and a polyterpene.
Resealable packaging material
When at least a part of the heat-sealing layer is heat-sealed to the adherend and another part of the resealable packaging material is picked to peel the resealable packaging material from the adherend, the resealable packaging material is peeled off. The adhesive layer and the heat-sealing layer are broken, and the surface of the base material layer on the adhesive layer side is exposed at the heat-sealed portion, whereby the resealing portion that is a part of the adhesive layer is exposed. When the surface of the base material layer on the adhesive layer side is pressed against the resealing portion, the surface of the base material layer on the adhesive layer side and the resealing portion can be adhered to each other.
Resealable packaging material.
The resealable packaging material according to claim 1, wherein the heat seal layer is a polyethylene resin layer having a density of 0.920 to 0.958 g / cm 3.
The resealable packaging material according to claim 2, wherein the polyethylene resin layer is a mixed resin layer of high-density polyethylene and low-density polyethylene.
The resealing packaging material according to claim 3, wherein the content of the high-density polyethylene in the heat-sealing layer is 50 to 90% by mass with respect to the entire mass of the heat-sealing layer.
The resealable package according to any one of claims 1 to 4, wherein the base material layer includes a base material resin layer, and the base material resin layer is in direct contact with the adhesive layer. Material.
The resealable packaging material according to any one of claims 1 to 5, wherein the thermoplastic elastomer is a styrene-based thermoplastic elastomer.
The resealable packaging material according to any one of claims 1 to 6, wherein the styrene-based thermoplastic elastomer is a styrene-butadiene-butylene-styrene copolymer.
The resealable packaging material according to any one of claims 1 to 7, wherein the thickness of the adhesive layer is 7 μm or less.
A resealable lid material composed of the resealable packaging material according to any one of claims 1 to 8.
A laminate for forming a lid material, which has a plurality of resealable lid materials according to claim 9 and a surplus portion between the plurality of resealable lid materials.
Containers with storage and flanges,
The resealable lid material according to claim 9, wherein the contents contained in the container and the flange portion of the container are heat-sealed to seal the container. A container with a lid containing the contents.
The container with a lid containing the contents according to claim 11, wherein at least the flange portion of the container is a paper cup coated with a polyethylene resin.
A resealable packaging bag having the resealable packaging material according to any one of claims 1 to 7.