JP5117255B2 - Multi-layer film with reseal function and package using the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a multilayer film, and more particularly to a multilayer film with a reseal function suitably used for packaging foods and pharmaceuticals, and a resealable package using the same.

  Conventionally, various packages with resealing function have been used as packaging means for cosmetics and sanitary products that are repeatedly opened and resealed every time they are used, or for food and pharmaceuticals that cannot be consumed once. . This package can prevent oxidative deterioration of the contents remaining after opening, or deterioration due to moisture absorption, drying, etc. For example, a zipper type package in which a plastic zipper is laminated is known. However, although this package can be repeatedly opened and has excellent durability, a dedicated device for attaching an accessory such as a zipper to the package is necessary, and a processing step associated therewith is also necessary. There were problems such as increased manufacturing costs and reduced production efficiency.

  On the other hand, a multilayer film that can give a reseal function to the package itself without attaching an accessory such as a zipper has been developed. For example, Patent Documents 1 and 2 include a surface resin layer (A), a pressure-sensitive resin layer (B) containing a hydrogenated product of a styrene-diene rubber block copolymer and a tackifier, A multi-layer film for a lid material comprising a heat-seal resin layer (C), and when the multi-layer film is peeled off from the bottom material, the pressure-sensitive resin layer (B) can be exposed in an adhesive state that can be resealed at the heat seal portion A multilayer film is disclosed.

  However, these multilayer films contain a large amount of rubber block copolymer hydrogenated substances and tackifying resins such as rosin-based resins, terpene resins, and petroleum hydrocarbon resins as essential components for the adhesive resin layer (B). Since it is necessary to contain, for example, when forming a co-extruded multilayer film, the resin composition of the adhesive resin layer (B) is previously uniformly compounded with a kneading apparatus such as a biaxial extruder, Alternatively, it is necessary to introduce a biaxial extruder as an extrusion equipment for the adhesive resin layer (B). Usually, the extrusion equipment of a co-extrusion multilayer film manufacturer often employs a single screw extruder, and for such a film manufacturer, in order to contain a large amount of tackifying resin, the production cost is low. Or a new capital investment is required. Moreover, since the initial peel strength of the multilayer film having the pressure-sensitive adhesive resin layer (B) containing a large amount of tackifying resin has a large change over time, it takes a lot of time to check whether it has a stable peel strength. In some cases, the production efficiency may be reduced. Furthermore, when a multilayer film containing a large amount of tackifying resin is used in a food packaging, the amount of the tackifying resin extracted tends to increase in an elution test using n-heptane, which is a pseudo solvent for oily foods. Therefore, it is preferable not to mix the tackifier resin as much as possible from the viewpoint of food hygiene.

  Patent Document 3 discloses a heat-sealing packaging material in which an adhesive resin layer (adhesive layer) and a heat seal agent layer are formed in this order on at least one surface of a substrate, and the adhesive resin layer and the above-mentioned A packaging material is disclosed in which the adhesive strength between the heat sealant layers is smaller than the heat seal strength between the heat sealant layer and the layer to be heat sealed.

  Specifically, as an example, on a biaxially stretched polypropylene surface of a laminate film (thickness 50 μm) made of polyester and biaxially stretched polypropylene, 10% by mass of styrene and 90% by mass of a diene hydrocarbon are formed. Heat seal in which an adhesive resin layer having a thickness of 25 μm is laminated by extrusion lamination using a random copolymer with a hydrogenated product of a random copolymer, and a solvent-soluble acrylic heat seal lacquer is further coated on the adhesive resin layer The packaging material which laminated | stacked the agent layer is illustrated. In the case of a package body cut out in a circle with a tab and heat-sealed in a polystyrene container as a lid material, if the tab is pinched and pulled, peeling occurs at the interface between the adhesive resin layer and the heat-sealant layer, and the peeling occurs It is described that when a lid is placed on a container and pressure-bonded with a finger or the like, the adhesive resin layer re-adheres to the flange portion and is sealed again.

However, the packaging body having the above structure has a process in which the adhesive resin is exposed to the outside before coating the heat sealing agent, and dust, dust, etc. floating in the atmosphere adhere to the adhesive resin. In some cases, resealability may be reduced, and special equipment such as a coater for coating and a drying equipment is required, resulting in an increase in manufacturing cost.
JP 2003-175567 A JP 2004-75181 A JP 2005-41539 A

  The present invention has been made to solve the problems of conventional lid materials, and the problems are excellent in food hygiene, good easy-openability, and good recombination only by pressure pressing with hands and fingers. It is an object to provide a multilayer film with a resealing function having both sealing properties and a resealable package using the same.

As a result of intensive studies, the present inventors have found that the above problem can be solved by using a styrene-based thermoplastic elastomer having a specific viscoelastic property as a main component of the adhesive resin layer, and to complete the present invention. It came.
That is, the subject of this invention is achieved by the following multilayer film with a reseal function, and the package using the multilayer film.

(1) A surface resin layer (A), an adhesive resin layer (B), and a heat seal resin layer (C) are laminated in the order of (A) / (B) / (C), and the adhesive resin layer (B) Contains a styrene thermoplastic elastomer (b) whose peak value of loss tangent (tan δ) measured at a frequency of 10 Hz by dynamic viscoelasticity measurement is −35 ° C. or more as a main component, but substantially contains a tackifying resin. layer not containing the made heat seal resin layer (C) is a single layer structure or Zur bromide resin, lid resealing function equipped multilayer film thickness is 1μm or 30μm or less of the heat seal resin layer (C) It is a package in which the bottom material and the lid material are heat-sealed by heat-sealing the heat-seal resin layer (C) of the multilayer film to the heat-sealed part of the object to be sealed. , In the heat seal part Te, wherein when the adhesive resin layer (B) and the heat seal resin layer (C) is delaminated, reclosable package, characterized in that both layers are exposed at the resealable state.
(2) The exposure of the pressure-sensitive adhesive resin layer (B) is the breakage of the heat-seal resin layer (C) from the multilayer film, the pressure-sensitive adhesive resin layer (B), and the heat-seal resin layer in the heat seal portion. The resealable packaging body according to the above (1), which is performed by delamination with (C) and transfer of the heat seal resin layer (C) to the sealed body side.
(3) The surface resin layer (A) is at least one thermoplastic selected from the group consisting of olefin resins, amide resins, saponified ethylene-vinyl acetate copolymers, ester resins, and styrene resins. The resealable packaging body according to the above (1) or (2), wherein the resealable packaging body is composed of a resin as a main component.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in food hygiene, has a good easy-opening property, and a multi-layer film with a reseal function having both good re-sealability only by pressure and pressure bonding with hands and fingers, and A sealable package can be provided.

Hereinafter, the multilayer film with re-sealing function and the package of the present invention (hereinafter referred to as “multilayer film of the present invention” and “package of the present invention”, respectively) will be described in detail.
In the present specification, “configured as a main component” is intended to allow other components to be included within a range that does not impede the action and effect of the resin constituting each layer. Further, this term does not limit the specific content, but it is 70% by mass or more and 100% by mass or less, preferably 85% by mass or more and 100% by mass or less, more preferably 95% by mass of the total components of each layer. It means that it occupies% or more and 100 mass% or less.

[Multilayer Film of the Present Invention]
The multilayer film of the present invention is a multilayer film in which a surface resin layer (A), an adhesive resin layer (B), and a heat seal resin layer (C) are laminated in the order of (A) / (B) / (C). And the adhesive resin layer (B) is mainly composed of a styrene thermoplastic elastomer (b) having a peak value of loss tangent (tan δ) measured at a frequency of 10 Hz by dynamic viscoelasticity measurement of −35 ° C. or more. When the heat seal resin layer (C) is heat-sealed at the heat-sealed portion of the object to be sealed and then the multilayer film is peeled from the heat-sealed portion, The adhesive resin layer (B) and the heat seal resin layer (C) are delaminated, and the adhesive resin layer (B) is exposed to be resealable with the heat seal resin layer (C). To With sealing function is a multi-layer film.

First, the surface resin layer (A) of the multilayer film of the present invention will be described.
The surface resin layer (A) is a layer composed of the thermoplastic resin (a) as a main component, and the delamination strength between the surface resin layer (A) and the adhesive resin layer (B) at the time of peeling is adhesive. The layer structure is not particularly limited as long as it is greater than the delamination strength between the resin layer (B) and the heat seal resin layer (C), and may be a single layer or a multilayer.

  The thermoplastic resin (a) used as the main component of the surface resin layer (A) is appropriately selected in consideration of the type of resin used as the main component of the adhesive resin layer (B) and the heat seal resin layer (C). There is a need to. Since the thermoplastic resin (a) has a melt extrusion temperature in a range of approximately 180 ° C. or more and 300 ° C. or less, a thermoplastic resin that can be melt extruded within this range is suitably used. Specific examples of the thermoplastic resin (a) include olefin resins (ethylene resins, propylene resins, cyclic olefin resins, etc.), amide resins, saponified ethylene-vinyl acetate copolymers, ester resins, Examples thereof include styrene resins and carbonate resins. These thermoplastic resins can be used alone or as a mixed resin composition of two or more, and can form a single layer structure or a multilayer structure.

  In the present invention, in consideration of molding processability, production cost, transparency and the like, the thermoplastic resin (a) includes olefin resin, amide resin, saponified ethylene-vinyl acetate copolymer, ester resin, and styrene. At least one thermoplastic resin selected from the group consisting of a series resin can be suitably used.

  When the olefin resin is an ethylene resin, examples of the ethylene resin include very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), and high density. Ethylene resins such as polyethylene (HDPE); ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer Copolymer (EMA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-glycidyl methacrylate copolymer (E-GMA), ethylene-vinyl acetate-glycidyl methacrylate copolymer (E-VA-GMA), D Ethylene copolymers such as lene-maleic anhydride copolymer (E-MAH), ethylene-ethyl acrylate-maleic anhydride copolymer (E-EA-MAH); and further ethylene-acrylic acid copolymer And a neutralized metal of ethylene-methacrylic acid copolymer. These may be used alone or in combination of two or more.

  When the olefin resin is a propylene resin, examples of the propylene resin include propylene homopolymers and copolymers of propylene and other α-olefins such as ethylene and butene. Either a copolymer or a block copolymer can be used. The stereoregularity may be any of an isotactic structure, a syndiotactic structure, an atactic structure, a stereo block structure, and the like. These may be used alone or in combination of two or more.

  When the olefin resin is a cyclic olefin resin, examples of the cyclic olefin resin include random copolymers of ethylene and cyclic olefins such as norbornenes, tetracyclododecenes and derivatives thereof, and cyclic olefin ring-opening (co) Examples thereof include polymers, hydrogenated products of cyclic olefin ring-opening (co) polymers, graft-modified products of these (co) polymers, and the like. Here, in the case of a random copolymer of ethylene and a cyclic olefin, it may contain an α-olefin other than ethylene, or may contain butadiene, isoprene or the like as the third component. These may be used alone or in combination of two or more.

  Examples of the amide-based resin include, as aliphatic polyamide polymers, ring-opening polymers of cyclic lactams, polycondensates of aminocarboxylic acids, and polycondensates of dicarboxylic acids and diamines. Specifically, a homopolymer of ε-caprolactam referred to as 6 nylon, polyhexamethylene adipamide referred to as 66 nylon, or 6-66 nylon as a copolymer thereof can be used. Moreover, as an aromatic polyamide polymer, a resin containing 70 mol% or more of a polyamide constituent unit composed of xylylenediamine and an α, ω aliphatic dicarboxylic acid having 6 to 12 carbon atoms in the molecular chain, etc. Can be used. Specifically, homopolymers such as polymetaxylylene adipamide, polymetaxylylene pimeramide, polymetaxylylene azelamide, polyparaxylylene azelamide, polyparaxylylene decanamide, metaxylylene / paraxylylene azamide Examples of the copolymer include a amide copolymer, a metaxylylene / paraxylylene pimeramide copolymer, a metaxylylene / paraxylylene azeramide copolymer, and a metaxylylene / paraxylylene sepacamide copolymer. These may be used alone or in combination of two or more.

  The saponified ethylene-vinyl acetate copolymer has an ethylene content of 29% or more, preferably 32% or more, 47 mol% or less, preferably 44 mol% or less, and a saponification degree of 90%. Above, preferably 95% or more is suitably used. By selecting a grade in which the ethylene content and the degree of saponification are in the above ranges, the gas barrier properties and mechanical strength of the film can be improved. These may be used alone or in combination of two or more.

  Examples of the ester resin include polyethylene terephthalate resin, polypropylene terephthalate resin, polybutylene terephthalate resin, polyethylene isophthalate resin, polyethylene naphthalate resin, polybutylene naphthalate resin, polyethylene terephthalate / isophthalate copolymer resin, 1,4-cyclohexane. Represented by low crystalline or amorphous polyethylene terephthalate resin, polyethylene / neopentyl terephthalate copolymer resin, and polylactic acid-based resin containing 15 to 50 mol% of dimethanol units in all glycol monomer units. Examples include aliphatic polyester resins.

  In addition, a thermoplastic polyester elastomer having a high melting point and high crystallinity aromatic polyester as a hard segment and an amorphous polyester or amorphous polyether as a soft segment may be appropriately mixed with the ester resin. These elastomers may be used alone or in a suitable mixture of two or more.

  Examples of the styrenic resin include general-purpose polystyrene (GPPS), high-impact polystyrene (HIPS), styrene- (meth) acrylic acid ester copolymer, and a styrenic copolymer composed of a styrenic monomer and a (meth) acrylic acid ester. Examples thereof include a resin containing 1% by mass to 20% by mass of a rubber-like elastic body as dispersed particles in the continuous phase. You may use these individually by 1 type or in mixture of 2 or more types.

  The surface resin layer (A) is composed of two or more surface resin layers (A) in order to give the multilayer film functions such as gas barrier properties and pinhole resistance, and is composed of ethylene-vinyl acetate. It is preferable to have at least one layer containing a saponified polymer as a main component and / or a layer containing an amide resin as a main component. However, when the surface resin layer (A) has a multilayer structure, the delamination strength between the resin layers constituting the multilayer is the delamination between the adhesive resin layer (B) and the heat seal resin layer (C). It is also important to appropriately select and use an adhesive resin that is greater than the strength.

  Here, as the adhesive resin, ethylene-based resins such as linear low density polyethylene (LLDPE), low density polyethylene (LDPE), and ethylene-vinyl acetate copolymer (EVA), propylene homopolymer, and Propylene resins such as copolymers of propylene and other α-olefins, monobasic unsaturated fatty acids such as acrylic acid or methacrylic acid, or methyl acrylate, methyl methacrylate, or glycidyl methacrylate An olefin-based adhesive resin in which an ester compound of a monobasic unsaturated fatty acid or an anhydride of a dibasic fatty acid such as maleic acid, fumaric acid or itaconic acid is chemically bonded is preferably used. Specific examples of such an adhesive resin include trade name “Admer” manufactured by Mitsui Chemicals, Inc. and trade name “Modic” manufactured by Mitsubishi Chemical Corporation.

  Other components may be appropriately added to the surface resin layer (A) as long as the gist of the present invention is not impaired. Specific examples include components such as an antifogging agent, an antistatic agent, a heat stabilizer, a nucleating agent, an antioxidant, a lubricant, an antiblocking agent, a release agent, and an ultraviolet absorber. When the surface resin layer (A) has a multilayer structure, it may be added only to a specific layer or may be added to all layers.

Next, the adhesive resin layer (B) of the multilayer film of the present invention will be described.
The pressure-sensitive adhesive resin layer (B) contains, as a main component, a styrene-based thermoplastic elastomer (b) having a temperature indicating a loss tangent (tan δ) peak value measured at a frequency of 10 Hz by dynamic viscoelasticity measurement of −35 ° C. or more. It is important that the resin layer is formed. Here, if the temperature indicating the peak value of the loss tangent (tan δ) is −35 ° C. or higher, the pressure-sensitive adhesive layer (B) and the heat seal resin layer (C) exposed at the time of peeling are pressure bonded by hand or fingers. It is preferable because only practical resealability is exhibited. The resealability is presumed to be affected by viscoelastic properties at room temperature, particularly the value of loss tangent (tan δ), and the value of loss tangent (tan δ) at room temperature is 0.1 or more ( The upper limit is usually more preferably about 0.6). Moreover, the upper limit of the temperature which shows the peak value of loss tangent (tan-delta) of a styrene-type thermoplastic elastomer (b) is 10 degrees C or less normally from the characteristic as an elastomer. Furthermore, since the multilayer film of the present invention may be used even in a low-temperature environment such as a refrigeration facility typified by a refrigerator, taking these into consideration, the temperature showing the peak value of loss tangent (tan δ) The preferred range is −30 ° C. or higher, more preferably −25 ° C. or higher, and 5 ° C. or lower, more preferably 0 ° C. or lower.

  The styrenic thermoplastic elastomer (b) is preferably styrene, a copolymer of a styrene homologue such as α-methylstyrene and a conjugated diene, or a hydrogenated derivative thereof. Here, examples of the conjugated diene constituting the conjugated diene moiety include 1,3-butadiene, isoprene, 1,3-pentadiene, and the like. These may be used alone or in a state where two or more kinds are mixed in the copolymer. It may be included. However, the thermal stability and weather resistance when a double bond mainly consisting of vinyl bonds in the conjugated diene moiety remains are extremely poor. To improve this, 80% or more, preferably 95% of the double bonds. It is preferable to use one added with hydrogen.

The peak value of the loss tangent (tan δ) of the styrenic thermoplastic elastomer (b) mainly includes the styrene content and the vinyl bond content of the conjugated diene part (for example, 1,2 bond in the case of butadiene, and in the case of isoprene). It depends on the amount of bonds of 1, 2 bonds and 3, 4 bonds. In the present invention, the styrene content is 1% by mass or more, preferably 5% by mass or more, more preferably 10% by mass or more, 25% by mass or less, preferably 20% by mass or less, more preferably 15% by mass or less. A styrenic thermoplastic elastomer having a vinyl bond content of the conjugated diene moiety of 40 mol% or more, preferably 50 mol% or more is suitably used.
Specific examples of such a styrenic thermoplastic elastomer include the product name “Hibler 7311” manufactured by Kuraray Co., Ltd., the product name “Tuftec H1221” manufactured by Asahi Kasei Chemicals Corporation, and the product name “Jufactured by JSR Co., Ltd.” Dynalon 1320P "etc. can be illustrated.

  Other resins and components may be appropriately added to the pressure-sensitive adhesive resin layer (B) as long as the gist of the present invention is not impaired. Specific examples include low crystalline or amorphous olefin resins, softeners, oils (mineral oils), stabilizers (antioxidants, etc.), liquid paraffin, and the like.

  For the adhesive resin layer (B) of the multilayer film of the present invention, a petroleum resin such as cyclopentadiene or an alicyclic petroleum resin from its dimer or an aromatic petroleum resin from the C9 component, a terpene resin from β-pinene It is preferable not to mix a large amount of a tackifier resin such as terpene resin such as terpene-phenol resin, rosin resin such as gum rosin and wood rosin, and rosin resin such as esterified rosin resin modified with glycerin or pentaerythritol. This is because the coextrusion multilayer film manufacturer usually employs a single screw extruder, so when forming a multilayer film in the current coextrusion process, the resin composition of the adhesive resin layer When a resin composition containing a large amount of tackifying resin is used as a product, it is uniformly mixed with a kneading device such as a twin screw extruder in advance in order to secure the stability of film formation such as extrusion rate, thickness accuracy, or appearance. This is because a new capital investment is required such as adding a pre-process for compounding to the above or introducing a twin screw extruder or the like as an extrusion facility for the adhesive resin layer. In addition, the initial peel strength of the adhesive resin layer containing a large amount of the tackifying resin is greatly changed over time, and when used for food packaging, a large amount of the tackifying resin is mixed with a pseudo-solvent for an oily food. In a dissolution test using a certain n-heptane, the amount of extraction tends to increase, and it is considered preferable not to mix as much as possible from the viewpoint of food hygiene.

Next, the heat seal resin layer (C) of the film of the present invention will be described.
The heat seal resin layer (C) is a heat sealable resin layer mainly composed of the thermoplastic resin (c). The heat seal resin layer (C) is heat-sealed at the heat seal portion of the object to be sealed, and then when the multilayer film is peeled from the heat seal portion, the adhesive resin layer (B) and the heat seal resin layer (C) There is no particular limitation as long as the layer delamination strength is lower than the delamination strength between the surface resin layer (A) and the adhesive resin layer (B). The resin layer may be a multi-layered resin layer.

  The thermoplastic resin (c) contained as the main component of the heat seal resin layer (C) is a sealed object when the film of the present invention is used as a cover material of a package or as a bottom material after deep drawing. Considering the material of the sealing surface of a certain base material or cover material and the type of resin used for the surface resin layer (A) and the adhesive resin layer (B), a resin that has an appropriate heat seal strength is appropriately selected and used. can do. Specifically, as the thermoplastic resin (c), the balance between easy-openability and resealability with the adhesive resin layer (B) mainly composed of the styrenic thermoplastic elastomer (b), molding processability and transparency. In view of the properties, olefin resins (ethylene resins, propylene resins, etc.), styrene resins, ester resins, polyamide resins and the like can be mentioned.

  In the present invention, as the thermoplastic resin (c) suitably used in the heat seal resin layer (C), the adhesive resin layer (B) and the release resin are separated by an external force at the time of delamination from the adhesive resin layer (B). Roughness of the delamination surface of the layer (C) and unevenness of each layer can be suppressed to a small extent, easy opening and re-sealing properties when repeated opening and re-sealing are good, industrially stable, and relatively It is preferable to use an ester resin or an amide resin that can be obtained at low cost. In particular, all 1,4-cyclohexanedimethanol units exhibit excellent heat-seal strength at relatively low temperatures, with excellent processability and transparency, and do not peel or open with a slight impact. Low crystalline or amorphous polyethylene terephthalate resin containing 15 mol% or more and 50 mol% or less in glycol monomer units, dicarboxylic acids such as terephthalic acid and isophthalic acid, and diamines such as hexamethylenediamine and isophoronediamine A low crystalline or amorphous polyamide resin obtained by reacting can be suitably used.

  Here, as the amorphous polyethylene terephthalate resin, for example, trade name “EASTAR PETG Copolyester 6763” manufactured by Eastman Chemical Co., Ltd., and trade name “SkyGreen S2008” manufactured by SKC Co., Ltd. can be exemplified.

  Further, examples of the amorphous polyamide include a product name “Novamid X21” manufactured by Mitsubishi Engineering Plastics Co., Ltd. and a product name “Sealer PA3426” manufactured by Mitsui DuPont Polychemical Co., Ltd.

  Furthermore, you may add suitably another component to the heat seal resin layer (C) in the range which does not impair the main point of this invention. Specific examples include antifogging agents, antistatic agents, heat stabilizers, nucleating agents, antioxidants, mold release agents, and ultraviolet absorbers.

  In the multilayer film of the present invention, the heat-sealing resin layer (C) of the multilayer film is heat-sealed at the heat-sealed portion of the object to be sealed, and then the multilayer film is peeled off from the heat-sealed portion. In the heat seal portion, the heat seal resin layer (C) is broken from the multilayer film, the adhesive resin layer (B) and the heat seal resin layer (C) are delaminated, and Since the heat sealing resin layer (C) is transferred by moving to the sealed body side, the combination of resins selected for each layer is between the adhesive resin layer (B) and the heat sealing resin layer (C). It is necessary that the delamination strength is smaller than the delamination strength between the surface resin layer (A) and the adhesive resin layer (B). At the same time, it is also important to ensure the delamination strength to such an extent that the function as a package can be maintained so that the layers are not easily peeled off or opened by a slight impact.

  From these viewpoints, as a combination of resins selected for the adhesive resin layer (B) and the heat seal resin layer (C), the delamination strength (initial peel strength) is in the range of 1 N / 15 mm width to 20 N / 15 mm width. It is preferable to select so as to be. Here, if the delamination strength is 1 N / 15 mm width or more, problems such as easy opening of the packaging body due to a slight impact are unlikely to occur, and if it is 20 N / 15 mm width or less, the packaging body Is easy because it is easy to open by hand, which is preferable.

  In the present invention, the lower limit of the delamination strength (initial peel strength) between the pressure-sensitive adhesive resin layer (B) and the heat seal resin layer (C) is 3 N / 15 mm width or more, more preferably 5 N / It is 15 mm width or more, and an upper limit is 15 N / 15 mm width or less, More preferably, it is 10 N / 15 mm width or less.

  Next, with regard to resealability after opening, for example, the adhesive resin layer (B) and the heat seal resin layer (C) after opening and resealing a total of 5 times only by pressure and pressure bonding by hand or finger. It is preferable that the delamination strength (reseal peel strength) is 0.5 N / 15 mm width or more. Here, the reseal peel strength is 0.5 N / 15 mm width or more, preferably 0.75 N / 15 mm width or more, more preferably 1.0 N / 15 mm width or more (only re-seal strength is obtained by pressure bonding with hands or fingers). The upper limit of the sealing peel strength is not more than the delamination strength between the adhesive resin layer (B) and the heat seal resin layer (C), preferably not more than 10 N / 15 mm width, more preferably not more than 5.0 N / 15 mm width. ) Is preferable because practical resealability can be obtained.

  In the present invention, as a preferable combination of the surface resin layer (A), the adhesive resin layer (B), and the heat seal resin layer (C) satisfying such conditions, as described above, the surface resin layer (A) is an olefin. A layer composed mainly of at least one thermoplastic resin selected from the group consisting of saponified resins, amide-based resins, saponified ethylene-vinyl acetate copolymers, ester-based resins, and styrene-based resins. A layer composed mainly of a styrene-based thermoplastic elastomer having a loss tangent (tan δ) peak value measured at a frequency of 10 Hz by dynamic viscoelasticity measurement as −35 ° C. or more as an adhesive resin layer (B) Examples of the heat seal resin layer (C) include those provided with a layer composed mainly of an ester resin or an amide resin.

Next, the thickness of each layer described above will be described.
The surface resin layer (A) is a resin layer having a single layer or a multilayer structure, and usually has a thickness of 1 μm or more, preferably 10 μm or more, more preferably 20 μm or more, and 1000 μm or less, preferably 600 μm or less, Preferably it is 500 micrometers or less. Here, if the thickness of the surface resin layer (A) is 1 μm or more, it is easy to dispose a layer imparting characteristics such as gas barrier properties and pinhole resistance and an adhesive resin layer, and the thickness thereof. If it is 1000 micrometers or less, since heat can be easily transferred to the heat seal resin layer (C) during heat sealing, it can be easily heat sealed with the sealing portion of the object to be sealed.

  The adhesive resin layer (B) is usually a resin layer having a single layer structure, and the thickness thereof is not particularly limited, but the balance between easy-openability and resealability, moldability, production cost, etc. Therefore, 0.5 μm or more, preferably 5 μm or more, more preferably 10 μm or more and 100 μm or less, preferably 70 μm or less, more preferably 50 μm or less is suitably employed.

  The thickness of the heat seal resin layer (C) is not particularly limited, but is 1 μm or more, preferably 3 μm or more, more preferably 5 μm or more, 30 μm or less, preferably 25 μm or less, more preferably 15 μm or less. It is desirable. Here, if the total thickness is 1 μm or more, it is preferable because the deformation such as pressurization by a heat seal hot plate at the time of heat sealing can prevent problems such as deterioration of the function of each layer, and the thickness is also preferable. If it is 30 micrometers or less, when peeling an adhesive resin layer (B) and a heat seal resin layer (C), a heat seal resin layer (C) can be easily fractured | ruptured, and an adhesive resin layer (B) is reused. This is preferable because it can be exposed in a sealable state.

Next, the manufacturing method of the multilayer film of this invention is demonstrated.
Although it does not restrict | limit especially as a manufacturing method of the multilayer film of this invention, The coextrusion method excellent in protection, productivity, hygiene, etc. of an adhesive resin layer (B) can be used suitably. That is, the resin compositions used for the surface resin layer (A), the adhesive resin layer (B), and the heat seal resin layer (C) described above are heated and melted in separate extruders, and the multi-manifold method, feed block method, etc. After being laminated in the order of (A) / (B) / (C) in a molten state by the known method, it can be formed into a multilayer film by a T-die / chill roll method, an inflation method or the like. Here, in order to improve printing suitability and laminate suitability, it is preferable to perform a surface treatment on the surface of the outermost layer of the surface resin layer (A) of the obtained multilayer film. Examples of the surface treatment include corona treatment, plasma treatment, chromic acid treatment, flame treatment, surface oxidation treatment such as hot air treatment ozone / ultraviolet treatment, and surface unevenness treatment such as sand blasting. Corona treatment is preferably used from the viewpoint of treatment effect, productivity, and manufacturing cost.

  The multilayer film of the present invention, on the surface resin layer (A) opposite to the surface on which the adhesive resin layer (B) is laminated, by a known method such as a dry lamination method or an extrusion lamination method, if necessary, A laminate base material can be laminated through an adhesive resin, an adhesive, or the like to obtain a laminate film or laminate sheet. Here, the laminate substrate is not particularly limited, but for example, biaxially stretched polypropylene film, biaxially stretched nylon film, biaxially stretched polyethylene terephthalate film, unstretched polypropylene sheet, unstretched polyethylene terephthalate sheet, An aluminum foil, paper, a nonwoven fabric, etc. are mentioned. In the present invention, a dry lamination method is preferably used, and examples of the adhesive used at that time include a polyester-polyurethane adhesive and a polyether-polyurethane adhesive.

[Cover material, bottom material and packaging]
The film itself of the present invention, or the laminate film or laminate sheet obtained by laminating the film of the present invention and a laminate base material can be used as a cover material or a bottom material of various packaging bodies, respectively. For example, when the laminate film is used as a lid for a package (container), the package (container) (sealed body) filled with a heat seal resin layer (C) of the lid and contents such as food ) And a heat seal resin layer and heat-sealing to obtain a package (container) having airtightness, practical initial peel strength, and resealing function. This package (container) is exposed on the peeled surface after opening in a state where the adhesive resin layer (B) can be resealed, and can be resealed only by pressure pressing with a hand or a finger. Moreover, as a bottom material of various packaging bodies (containers), it is possible to obtain a packaging body (container) having a reseal function similarly by performing deep drawing or the like.

Next, the reseal function in a deep-drawn package using the film of the present invention as a lid or bottom material will be described.
FIG. 1 is a partial cross-sectional view of a deep-drawn package using the film of the present invention as a lid, and FIG. 2 is a diagram of the deep-drawn package shown in FIG. FIG. 3 is a partial cross-sectional view showing a state in which the lid and the bottom material are resealed in the deep-drawn package shown in FIG. 2. FIG. 4 is a partial cross-sectional view of a deep-drawn package using the film of the present invention as a bottom material, and FIG. 5 shows a part of the lid material from the bottom material in the deep-drawn package shown in FIG. FIG. 6 is a partial cross-sectional view of the deep-drawn package in a peeled state, and FIG. 6 is a partial cross-sectional view showing a state in which the lid material and the bottom material are resealed in the deep-drawn package shown in FIG.

  1 to 3, reference numeral 1 is a lid member, reference numeral 2 is a bottom material (sealed body), reference numeral 3 is a surface resin layer of the lid member, reference numeral 4 is an adhesive resin layer of the lid member, and reference numeral 5 is a lid. Heat seal resin layer of the material, 6 is the surface resin layer of the bottom material, 7 is the heat seal resin layer of the bottom material, 8 is the heat seal portion, 9 is the tab portion, 10 is the adhesive resin layer at the time of peeling Reference numeral 4 indicates an exposed portion of the heat seal resin layer 5 at the time of peeling.

  4 to 6, reference numeral 41 is a bottom material, reference numeral 42 is a lid member (sealed body), reference numeral 43 is a surface resin layer of the bottom material, reference numeral 44 is an adhesive resin layer of the bottom material, and reference numeral 45 is a bottom material. , 46 is a surface resin layer of the lid material, 47 is a heat seal resin layer of the lid material, 48 is a heat seal portion of the lid material, 49 is a tab portion of the lid material, and 50 is peeled. The exposed portion of the adhesive resin layer 44 at the time, 51 is the exposed portion of the heat seal resin layer 45 at the time of peeling.

  When the film of the present invention is used as a lid of a deep drawn package, as shown in FIG. 1, the lid 1 is composed of a surface resin layer 3, an adhesive resin layer 4, and a heat seal resin layer 5 in this order. Is done. The heat seal resin layer 5 of the lid member 1 is heat sealed with the heat seal resin layer 7 of the bottom material 2 which is a sealed object. That is, the lid member 1 and the bottom member 2 are bonded by the heat seal portion 8 formed by heat sealing.

  When the tab portion 9 provided on the lid member 1 is picked and pulled, as shown in FIG. 2, first, in the heat seal portion 8, the heat seal resin layer 5 on the tab portion 9 side is first broken from the lid material 1, Peeling is started between the adhesive resin layer 4 and the heat seal resin layer 5 in the lid material 1. When the peeling between the adhesive resin layer 4 and the heat seal resin layer 5 reaches the heat seal portion 8 on the side opposite to the tab portion 9 side, the heat seal resin layer 5 of the lid 1 is broken. The heat-seal resin layer 5 of the lid material 1 that has been broken moves to the bottom material 2 side that is the sheet body, and an exposed part 10 of the adhesive resin layer 4 and an exposed part 11 of the heat-seal resin layer 5 are formed.

  In the case of resealing, as shown in FIG. 3, the peeled cover material 1 is covered on the bottom material 2, and the surface resin layer 3 is pressure-bonded by hand or fingers to form the adhesive resin layer 4 of the cover material 1. By overlapping the exposed portion 10 and the exposed portion 11 of the heat seal resin layer 5 of the lid material 1 that has shifted to the bottom material 2, the lid material 1 and the bottom material 2 can be resealed.

  On the other hand, when the film of the present invention is used as a bottom material of a deep drawn package, as shown in FIG. 4, the bottom material 41 is composed of a surface resin layer 43, an adhesive resin layer 44, and a heat seal resin layer 45 in this order. It is laminated and configured. The lid member 42 and the bottom member 41 are bonded to each other by the heat seal portion 48 formed by heat sealing as in FIG.

  When the tab portion 49 provided on the lid member 42 is pinched and pulled, as shown in FIG. 5, in the heat seal portion 48, the heat seal resin layer 45 on the tab portion 49 side is first broken from the bottom material 41, and Peeling is started between the adhesive resin layer 44 and the heat seal resin layer 45 in the material 41. When the peeling between the adhesive resin layer 44 and the heat seal resin layer 45 reaches the heat seal portion 48 on the side opposite to the tab portion 49 side, the heat seal resin layer 45 of the bottom material 41 is broken. The heat-seal resin layer 45 of the broken bottom material 41 is transferred to the lid member 42 that is a sheet body, and an exposed part 50 of the adhesive resin layer 44 and an exposed part 51 of the heat-seal resin layer 45 are formed.

  Then, as shown in FIG. 6, when resealing, cover the peeled lid material 42 on the bottom material 41, and press and pressure-bond the surface resin layer 46 of the lid material with a hand or a finger. The cover material 42 and the bottom material 41 can be resealed by superimposing the exposed portion 50 of the adhesive resin layer 44 of 41 and the exposed portion 51 of the heat seal resin layer 45 of the bottom material 41 transferred to the cover material 42. it can.

  The package constituted by the film of the present invention can be used as a lid or bottom material for various containers, and its use is not particularly limited. For example, instant noodles, snack confectionery, chocolate confectionery, slices Products such as ham and other processed meat products, wet tissue, sweat paper, fragrances, disposable diapers, etc. used as containers packaged in units of several units, or opened and used each time cosmetics and sanitary products, ship medicines, emergency adhesive plasters It can be used as a container that packs medicines such as throat lozenges. In particular, it can be suitably used as a package for storing contents that remain susceptible to deterioration such as oxidative deterioration, moisture absorption, and drying after the opening.

The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to these examples.
In addition, the various measured values and evaluation about the film displayed in this specification were performed as follows. Here, the flow direction from the extruder of the film is called the vertical direction, and the orthogonal direction is called the horizontal direction.

(1) Temperature showing peak value of loss tangent (tan δ) A sample was cut into a length of 4 mm and a width of 60 mm, and a viscoelastic spectrometer DVA-200 (manufactured by IT Measurement Co., Ltd.) was used, with a vibration frequency of 10 Hz and a strain of 0.1. %, Temperature rising rate of 3 ° C./min, 25 mm between chucks, the lateral direction was measured from −100 ° C., and the temperature showing the peak value of loss tangent (tan δ) was determined from the obtained data.

(2) Initial peeling strength The bottom material of the obtained deep-drawn package and the heat seal part of the lid were cut into strips having a width of 15 mm and used as test pieces. When this specimen is pulled at an angle of 180 degrees under the conditions of a temperature of 23 ° C. and a tensile speed of 200 mm / min using a universal testing machine (manufactured by Intesco Corp.), peeling when the bottom material and the lid material are peeled The strength was measured as the initial peel strength (N / 15 mm width).

(3) Membrane remaining situation The situation when peeled by hand from the bottom seal of the obtained deep-drawn package and the heat seal part of the lid was visually evaluated according to the following criteria.
○: When the resin layer breaks cleanly and there is no film residue or fluffing ×: When the resin layer cannot be broken or film breakage or fluffing occurs even when broken

(4) Reseal peel strength After opening the heat-seal part of the deep-drawn package, the lid material and the container were resealed again with a finger, and then the opening and resealing were repeated a total of 5 times. Peel strength (reseal peel strength) was measured under the same conditions as (2) initial peel strength. In addition, the following standards are also shown.
○: When the reseal peel strength is 0.5 N / 15 mm width or more ×: When the reseal peel strength is less than 0.5 N / 15 mm width

Example 1
[Cover material]
The surface resin layer (A) has a three-layer structure using the following three types of resins.
A1: Saponified ethylene-vinyl acetate copolymer (manufactured by Kuraray Co., Ltd., trade name “Eval E105”, hereinafter abbreviated as “EVOH”)
A2: 6-66 nylon resin (Mitsubishi Engineering Plastics Co., Ltd., trade name “Novamid 2030”, hereinafter abbreviated as “6-66Ny”)
A3: Olefin-based adhesive resin (manufactured by Mitsui Chemicals, trade name “Admer NF558”, hereinafter abbreviated as “AD1”)

The pressure-sensitive adhesive resin layer (B) is a styrene-based thermoplastic elastomer (manufactured by Kuraray Co., Ltd., trade name “HIBLER 7311”, styrene content: 12% by mass, temperature indicating a peak value of loss tangent (tan δ): −18.6. Tan δ value at 0.1 ° C. and 20 ° C .: 0.19, hereinafter abbreviated as “TPS1”), the heat seal resin layer (C) is an amorphous polyamide resin (manufactured by Mitsubishi Engineering Plastics Co., Ltd., trade name “ Novamid X21 "(hereinafter abbreviated as" Non-crystalline Ny ") was composed of a resin composition in which 1000 ppm of erucamide was added as a lubricant and 2000 ppm of natural silica was added and mixed as an antiblocking agent.

  (A) Extruder for layer (single screw extruder of 50 mm in diameter for all three layers), (B) Extruder for layer (single screw extruder of 50 mm in diameter), (C) Extruder for layer (caliber) 50 mm single-screw extruder) is supplied to each extruder of a T-die / chill roll co-extrusion multilayer film production apparatus and co-extruded under conditions of an extrusion set temperature of 190 to 230 ° C. and a T die set temperature of 235 ° C. , (A1) / (A2) / (A3) / (B) / (C), each layer has an average thickness of 10 μm / 20 μm / 10 μm / 20 μm / 5 μm, and all layers have a thickness of 65 μm. A multilayer film (X1) was obtained.

  Next, on the outermost layer side of the surface resin layer (A) of the obtained multilayer film (X1), a biaxially stretched polyethylene terephthalate film substrate (trade name “Embret PET”, thickness 16 μm, manufactured by Unitika Ltd.) is placed. By laminating by a dry lamination method, a laminate film (X1LF) having a total thickness of 81 μm was obtained and used as a cover material of a package.

  In addition, as an adhesive for dry lamination, a two-component curable adhesive (manufactured by Dainippon Ink Co., Ltd. as the main agent, trade name “Dick Dry LX-75A”, as a curing agent, produced by Dainippon Ink Co., Ltd., trade name “Dick Dry KW-40” was used.

[Bottom material]
From the outermost layer side, EVOH, 6-66Ny, AD1, and amorphous Ny are laminated in the order of a resin composition (heat seal resin layer) in which 1000 ppm of erucamide is added as a lubricant and 2000 ppm of natural silica is added as an antiblocking agent. A multilayer film (Y1) having an average thickness of each layer of 10 μm / 20 μm / 10 μm / 30 μm and a total thickness of 70 μm was obtained by a coextrusion method. An unstretched polyethylene terephthalate sheet (Mitsubishi Chemical Co., Ltd., trade name “Novaclear”) having a total thickness of 250 μm is bonded to the outermost layer side (EVOH surface) of this multilayer film (Y1) by a dry lamination method. A laminate sheet (Y1LS) having a thickness of 320 μm was obtained and used as the bottom material of the package.
In addition, the grade similar to the case where a laminate film (X1LF) is produced was used as an adhesive for dry lamination.

[Deep-drawn packaging]
Using a deep-drawing packaging machine (manufactured by Mulchback, model number: R-530), the bottom material (Y1LS) is deep-drawn so that the non-stretched polyethylene terephthalate sheet layer is an outer layer, and the length is 130 mm. The container is processed into a rectangular container having a width of 170 mm and a flange width of 6 mm. In the heat seal portion, the lid material (X1LF) is applied to the flange portion provided on the deeply drawn bottom material, and the heat seal temperature is 140. A deep-drawn package was produced by heat sealing under the conditions of ° C., sealing time: 2 seconds, sealing pressure: 4 kg / cm ² .
The results of evaluation using this deep-drawn package are shown in Table 1.

(Example 2 )
[Cover material]
A biaxially stretched polyethylene terephthalate film substrate (manufactured by Unitika Ltd., trade name “Embret PET”, thickness 16 μm) is bonded to the outermost layer side of the multilayer film (Y1) prepared in Example 1 by a dry lamination method. Thus, a laminate film (Y1LF) having a total thickness of 86 μm was obtained and used as a lid for the package.

[Bottom material]
An unstretched polyethylene terephthalate sheet having a total thickness of 250 μm (trade name “Novaclear”, manufactured by Mitsubishi Chemical Corporation) was bonded to the outermost layer side of the multilayer film (X1) prepared in Example 1 by a dry lamination method. A laminate sheet (X1LS) having a thickness of 315 μm was obtained and used as the bottom material of the package.

[Deep-drawn packaging]
A deep-drawn package was produced in the same manner as in Example 1. The results of evaluation using this deep-drawn package are shown in Table 1.

(Comparative Example 1)
[Cover material]
In Example 1, the resin used for the adhesive resin layer (B) was 60 parts by mass of TPS1 used in Example 1 and a tackifier resin (terpene resin, manufactured by Yasuhara Chemical Co., Ltd., trade name “YS Resin PX1150”) 40. The resin composition used for the heat seal resin layer (C) is changed to a resin composition in which parts by mass are mixed , and the amorphous polyester resin (manufactured by Eastman Chemical Co., Ltd., trade name “EASTAR PETG Polyester 6663”, hereinafter referred to as “PETG”) (Abbreviated)) In the same manner as in Example 1 except that it is changed to (A1) / (A2) / (A3) / (B) / (C), each layer has an average thickness. A multilayer film (X 2 ) having a thickness of 10 μm / 20 μm / 10 μm / 20 μm / 5 μm and a total thickness of 65 μm was obtained. Next, in the same manner as in Example 1, a biaxially stretched polyethylene terephthalate film base material was bonded by a dry lamination method to obtain a laminate film (X 2 LF) having a total thickness of 81 μm, which was used as a lid material for a package.

[Bottom material]
From the outermost layer side, EVOH, 6-66Ny, olefin-based adhesive resin (trade name “Admer SF715”, hereinafter abbreviated as “AD2”) manufactured by Mitsui Chemicals, Inc., 1000 ppm of erucamide as a lubricant to PETG In addition, a resin composition (heat seal resin layer) in which 2000 ppm of natural silica was added and mixed as an antiblocking agent was laminated in this order, and each layer had an average thickness of 10 μm / 20 μm / 10 μm / 30 μm and a total thickness of 70 μm. A film (Y2) was obtained by a coextrusion method. An unstretched polyethylene terephthalate sheet having a total thickness of 250 μm (product name “Novaclear”, manufactured by Mitsubishi Chemical Corporation) is bonded to the outermost layer side (EVOH surface) of the multilayer film (Y2) by a dry lamination method. A laminate sheet (Y2LS) having a thickness of 320 μm was obtained and used as a bottom material of the package.

[Deep-drawn packaging]
A deep-drawn package was produced in the same manner as in Example 1. The results of evaluation using this deep drawn package are shown in Table 1.

[Cover material]
In Comparative Example 1, the resin used for the adhesive resin layer (B) was changed from TPS1 to a styrene thermoplastic elastomer (manufactured by Asahi Kasei Corporation, trade name “Tuftec H1052”, styrene content: 20 mass%, loss tangent (tan δ). (A1) / () in the same manner as in Comparative Example 1 except that the temperature was changed to -42.2 ° C., tan δ value at 20 ° C .: 0.06, and hereinafter abbreviated as TPS2. A multilayer film (X 3 ) having a five-layer configuration of A2) / (A3) / (B) / (C), each layer having an average thickness of 10 μm / 20 μm / 10 μm / 20 μm / 5 μm, and a total thickness of 65 μm ) Next, in the same manner as in Example 1, a biaxially stretched polyethylene terephthalate film base material was bonded by a dry lamination method to obtain a laminate film (X 3 LF) having a total thickness of 81 μm, and was used as a lid material for a package.

[Bottom material]
As in Comparative Example 1, a laminate sheet (Y 2 LS) was used as the bottom material of the package.

[Deep-drawn packaging]
A deep-drawn package was produced in the same manner as in Example 1. The results of evaluation using this deep drawn package are shown in Table 1.

(Reference example)
[Cover material]
In Comparative Example 1, with the five-layer configuration of (A1) / (A2) / (A3) / (B) / (C), the average thickness of each layer was changed to 10 μm / 20 μm / 10 μm / 20 μm / 40 μm, respectively. Obtained a multilayer film (X 4 ) having a total thickness of 100 μm in the same manner as in Example 1. Next, in the same manner as in Example 1, a biaxially stretched polyethylene terephthalate film base material was bonded by a dry lamination method to obtain a laminate film (X 4 LF) having a total thickness of 116 μm, which was used as a lid material for a package.

[Bottom material]
As in Comparative Example 1, a laminate sheet (Y 2 LS) was used as the bottom material of the package.

[Deep-drawn packaging]
A deep-drawn package was produced in the same manner as in Example 1. The results of evaluation using this deep-drawn package are shown in Table 1.

From Table 1, the resealable packaging body (deep-drawing packaging body) formed of the lid or bottom material defined in the present invention has an adhesive resin exposure status, initial peel strength, film residue status, and reseal peel strength. It was confirmed that all the characteristics were satisfactory and practical (Examples 1 and 2 ).
On the other hand, when a large amount of tackifying resin is mixed in the pressure-sensitive adhesive resin layer, it cannot be uniformly mixed with a single screw extruder, and stable film formation is difficult (Comparative Example 1). When the styrene-based thermoplastic elastomer having viscoelasticity characteristics outside the range specified in (1) was used for the adhesive resin layer, the reseal peel strength was insufficient (Comparative Example 2).
In addition, when the thickness of the heat seal resin layer was increased (when exceeding 30 μm), a film residue was generated when the heat seal resin layer was manually peeled off (reference example).

  The present invention is superior in food hygiene, and has both good easy-openability and good resealability only by pressure and pressure bonding with hands and fingers, so that it is a lid for packaging bodies such as foods, pharmaceuticals, and cosmetics. Can be widely used as.

It is a fragmentary sectional view of the package which used the multilayer film of the present invention for a lid. In the packaging body shown in FIG. 1, it is a fragmentary sectional view of the packaging body of the state which peeled a part of cover material from the container. In the package shown in FIG. 1, it is a fragmentary sectional view which shows the state which resealed the cover material and the bottom material. It is a fragmentary sectional view of the package which used the multilayer film of the present invention for the bottom material. In the packaging body shown in FIG. 1, it is a fragmentary sectional view of the packaging body of the state which peeled a part of cover material from the container. In the package shown in FIG. 1, it is a fragmentary sectional view which shows the state which resealed the cover material and the bottom material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cover material 2 Bottom material 3 Surface resin layer of cover material 4 Adhesive resin layer of cover material 5 Heat seal resin layer of cover material 6 Surface resin layer of bottom material 7 Heat seal resin layer of bottom material 8 Heat seal part 9 Cover material 10 Exposed portion of adhesive resin layer at the time of peeling 11 Exposed portion of heat seal resin layer at the time of peeling 41 Bottom material 42 Lid material 43 Surface resin layer of bottom material 44 Adhesive resin layer of bottom material 45 Heat seal of bottom material Resin layer 46 Surface resin layer of lid member 47 Heat seal resin layer of lid member 48 Heat seal portion 49 Tab portion of lid member 50 Exposed portion of adhesive resin layer at peeling 51 Exposed portion of heat seal resin layer at peeling

Claims (3)

The surface resin layer (A), the adhesive resin layer (B), and the heat seal resin layer (C) are laminated in the order of (A) / (B) / (C), and the adhesive resin layer (B) is dynamic. A layer containing, as a main component, a styrene-based thermoplastic elastomer (b) having a loss tangent (tan δ) peak value measured at a frequency of 10 Hz by viscoelasticity measurement of −35 ° C. or more, but containing substantially no tackifying resin. the heat seal resin layer (C) consists of a single-layer structure or Zur bromide resin, the heat-sealing resin layer resealing function equipped multilayer film lid material or bottom thickness of (C) is at 1μm or 30μm or less One of the materials is a package in which the bottom material and the lid material are heat-sealed by heat-sealing the heat-seal resin layer (C) of the multilayer film to a heat-sealed portion of the object to be sealed, and the heat In the seal part, When serial adhesive resin layer (B) and the heat-seal resin layer and (C) is delaminated, reclosable package, characterized in that both layers are exposed at the resealable state. In the heat seal part, the adhesive resin layer (B) is exposed to breakage of the heat seal resin layer (C) from the multilayer film, and the adhesive resin layer (B) and the heat seal resin layer (C). The re-sealable packaging body according to claim 1, wherein the re-sealable packaging body is formed by delamination of the heat sealing resin layer (C) and transfer of the heat sealing resin layer (C) to the sealed body side. The surface resin layer (A) is mainly composed of at least one thermoplastic resin selected from the group consisting of an olefin resin, an amide resin, a saponified ethylene-vinyl acetate copolymer, an ester resin, and a styrene resin. The resealable package according to claim 1 or 2, wherein the package is configured as a component.

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