JP2006045527A - Laminated film using adhesive composition therein and its application - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive composition having optimum adhesiveness appropriate for a wrapping material that has an easy opening property and enables resealing, a laminated film produced using the adhesive composition as an intermediate layer, and a packaging material that comprises such laminated film, has easy opening property, and enables repeated resealing. <P>SOLUTION: The laminated film is basically composed of a tackifier composition comprising an olefin block copolymer elastomer (A), an ethylene-vinyl acetate copolymer (B) having the vinyl acetate content between 25 and 80 wt.%, and a tackifier (C) and is produced by laminating a heat sealing layer comprising a thermoplastic resin (E) on a laminate layer comprising a thermoplastic resin (D) via an intermediate layer comprising the composition. The lid material of a container comprises the laminated film. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention has an easy-open property and a pressure-sensitive adhesive composition suitable for use as a packaging material that can be resealed, a laminated film using such a pressure-sensitive adhesive composition as an intermediate layer, and a laminated film. The present invention relates to a packaging material that can be opened and repeatedly resealed.

Packaging for snacks such as rice crackers and potato chips, or food packaging such as jelly, milk, yogurt, pudding, tofu and lactic acid beverages, blister packaging, and other packaging materials for pharmaceuticals, medical instruments, daily necessities, sundries, etc. A package in which a cup or tray-like plastic container is sealed with a lid made of a plastic laminate film or an aluminum foil laminate film is widely used. The physical properties required for such a packaging material are mechanical strength that can withstand distribution channels, sealing strength that can maintain hygiene, and good openability during use.

However, such conventional packaging materials are excellent in easy-openability, but most of them cannot be resealed (resealed) at all once they are opened to take out the contents.
On the other hand, as a re-sealable packaging material, a lid formed by joining a front base material and a back base material through an adhesive layer is used, and the adhesive layer is exposed at the time of opening so that it can be opened and closed freely. Container (for example,
Patent Document 1) Adhesive agent (such as styrene / butadiene copolymer, ethylene / vinyl acetate copolymer) and terpene resins, petroleum hydrocarbon resins, etc.
Resealable packaging material using a sticky adhesive consisting of a blend with a tackifier)
For example, Patent Document 2 and Patent Document 3), or a multilayer film (for example, Patent Documents 4 and 5) using a pressure-sensitive adhesive using a hydrogenated styrene-butadiene copolymer as an elastomer, such as a pressure-sensitive adhesive layer as an intermediate layer Various methods using the method have been proposed.

Japanese Utility Model Publication No.62-31422 Japanese National Patent Publication No. 4-502588 Japanese Patent Laid-Open No. 2002-301786 JP 2003-175567 A JP 2004-58568 A

However, even if a laminated film having an intermediate layer of a pressure-sensitive adhesive composition composed of a tackifier such as terpene resins and an elastomer such as styrene / butadiene copolymer described in such a patent document is used as an easily openable packaging material, Either the surface resin layer and the adhesive resin layer, or the heat seal resin layer and the adhesive resin layer are peeled off at the time of opening, or the adhesive strength of the adhesive resin layer is still insufficient. It has been found that there is a case where the balance between easy-openability and reseal strength is lacking because the unsealing strength is too strong or the reseal strength is insufficient.

Therefore, the object of the present invention is to enable heat sealing, easy opening and repeated resealing, and
An object of the present invention is to obtain a packaging material having excellent reseal strength and having a balance between easy-openability and resealability.

In the present invention, the olefin block copolymer elastomer (A) has a vinyl acetate content of 2
A pressure-sensitive adhesive composition comprising 5 to 80% by weight of an ethylene / vinyl acetate copolymer (B) and a tackifier (C), on one side of a laminate layer comprising a thermoplastic resin (D) A laminated film, wherein a heat seal layer made of a thermoplastic resin (E) is laminated via an intermediate layer made of such an adhesive composition, a container lid made of a laminated film,
A package using a laminated film and a container using a container lid material are provided.

The pressure-sensitive adhesive composition of the present invention has an excellent characteristic that it has an easy-open property and an appropriate pressure-sensitive adhesive property suitable as a packaging material that can be resealed. Utilizing such properties, when the composition is used as an intermediate layer, a laminate layer made of a thermoplastic resin and a film in which a heat seal layer made of a thermoplastic resin is laminated as a packaging material, the heat sealability is excellent. In addition, when opening a package sealed by heat sealing (heat fusion), it has an appropriate heat seal strength (peeling strength), so that it is easy to open and the heat seal layer Breaking,
Interfacial peeling between heat seal layer and adhesive composition layer, or adhesive composition layer cohesive failure or adhesive composition layer also breaks, interfacial peeling between adhesive composition layer and laminate layer By doing so, the pressure-sensitive adhesive composition layer of the intermediate layer is exposed on the opening surface, and since this pressure-sensitive adhesive composition layer is excellent in self-adhesiveness, it has a sufficient adhesive force just by pressing with a fingertip, and at room temperature ( Of course, the self-adhesiveness of the pressure-sensitive adhesive layer does not decrease even when peeling and bonding are repeated at low temperatures (in and out of the refrigerator).
In addition, the laminated film of the present invention is a type or composition ratio of a polymer used in the pressure-sensitive adhesive composition,
By appropriately selecting the thermoplastic resin used for the laminate layer and the thermoplastic resin used for the heat seal layer, when the heat seal part of the laminated film used for the package is peeled off, the heat seal layer breaks and the intermediate layer The pressure-sensitive adhesive composition cohesively breaks off, and the peeled portion becomes cloudy. Even when resealed, the resealed portion maintains a cloudy state. It is possible to discriminate whether it is a packaged body by visual inspection.

Hereinafter, the requirements constituting the present invention will be described.
[Olefin block copolymer elastomer (A)]
The olefin block copolymer elastomer (A) according to the present invention is a block copolymer having a so-called amorphous soft segment comprising at least one olefin elastomer polymer portion and at least one so-called hard segment in the molecule. It is a coalescence. The soft segment composed of the olefin elastomer polymer part is usually ethylene, propylene, 1
-Random polymer part of α-olefin such as butene, polymer part of diene compound (diolefin) such as butadiene and isoprene or its hydrogenated product, and hard segment is usually glass transition of polystyrene polymer part Polymer part with point above room temperature, ethylene,
Those having crystallinity in the α-olefin polymer part such as propylene and 1-butene, or those having crystallinity in the hydrogenated product of the butadiene polymer part.
As a preferable example of the olefin block copolymer elastomer (A),
Styrene / diene block copolymer (A1) having a soft segment comprising at least one diene block (diene polymer part; diolefin polymer part) and a hard segment comprising at least one styrene block (styrene polymer part) And a soft segment composed of at least one amorphous olefin block (amorphous olefin polymer part) and a hard segment composed of at least one crystalline olefin block (crystalline olefin polymer part) An olefin block copolymer (A2) can be exemplified, and these block copolymers are generally produced and sold as thermoplastic elastomers.

[Styrene-diene block copolymer (A1)]
The styrene / diene block copolymer (A1) according to the present invention is a block copolymer having a soft segment composed of a diene block (diene polymer portion) and a hard segment composed of a styrene block (styrene polymer portion). A kind of block copolymer produced and sold as a so-called thermoplastic elastomer, specifically, for example, styrene-butadiene block copolymer (SB), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene block copolymer (SI) and styrene-isoprene-styrene block copolymer (SIS) or hydrogenated products of these block copolymers. This hydrogenated product is a block copolymer in which all of the styrene block and diene block are hydrogenated, or a block copolymer in which only the diene block is hydrogenated, or a part of the styrene block and diene block is hydrogenated. It may be a partially hydrogenated product such as a block copolymer.
When using these block copolymers or hydrogenated products thereof as an adhesive composition,
You may use individually or in combination of 2 or more types.
Among these block copolymers, hydrogenated styrene-butadiene block copolymer (SB), hydrogenated styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer ( More preferred is a hydrogenated product of a block copolymer containing a styrene block and a diene block, such as a hydrogenated product of SIS) or a hydrogenated product of styrene-isoprene block copolymer (SI). -Styrene-ethylene-butene block copolymer (SEB), hydrogenated product of butadiene block copolymer (SB), styrene-butadiene-styrene block copolymer (SB)
S) Hydrogenated Styrene-Ethylene-Butene-Styrene Block Copolymer (SE
BS), a styrene-ethylene / propylene-styrene block copolymer (SEPS), which is a hydrogenated product of styrene-isoprene-styrene block copolymer (SIS), has excellent thermal stability during extrusion and stability during processing. In terms of suppressing the generation of odors, degradation products and odors,
Most preferred.
In the styrene / diene block copolymer (A1) according to the present invention, an adhesive composition formed by mixing an ethylene / vinyl acetate copolymer (B) and a tackifier (C) described later has a film forming ability. As long as MFR (melt flow rate; ASTM D-1238 load 5 kg, temperature 200 ° C.) is not particularly limited, it is usually 0.5 to 20 g / 10 minutes, preferably 1 to 1.
It is in the range of 5 g / 10 minutes.

[Olefin / Amorphous Olefin Block Copolymer (A2)]
The olefin / amorphous olefin block copolymer (A2) according to the present invention comprises a soft segment composed of at least one amorphous olefin block (amorphous olefin polymer portion) in the molecule and a crystalline olefin block (crystal Block copolymer having a hard segment composed of a functional olefin polymer part), and is produced as a so-called thermoplastic elastomer.
It is a kind of block copolymer sold.
The structure of the olefin / amorphous olefin block copolymer (A2) is not particularly limited as long as it has at least one amorphous olefin block A and crystalline olefin block B in the molecule, and (B-A) n ₁ , (BA) n ₂ -B, (AB) n ₃ -A (n ₁ ,
n ₂ and n ₃ are integers of 1 or more) and a structure in which these are bound by a coupling agent.
Among these, a triblock copolymer or a copolymer having a larger number of blocks is preferable.
As such a block copolymer (A2), specifically, a polymer block mainly composed of a diene compound or a hydrogenation treatment of these polymer blocks to form an ethylene / butene copolymer or an ethylene / propylene copolymer. Examples thereof include a block copolymer having a soft segment composed of an amorphous olefin block having a similar structure and a hard segment composed mainly of a diene compound and capable of becoming a crystalline polyolefin by hydrogenation treatment. Further, a block copolymer in which a part of a polymer part mainly composed of a diene compound and capable of becoming a crystalline polyolefin by hydrogenation treatment is replaced with a hard segment composed of a polymer part of a vinyl aromatic compound such as styrene can be exemplified. Specific examples of the diene compound include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3
-Pentadiene and 2-methyl-1,3-pentadiene are exemplified.
A soft segment comprising an amorphous olefin block having a structure similar to that of an ethylene / butene copolymer or an ethylene / propylene copolymer obtained by hydrogenating a polymer block mainly composed of a diene compound is, for example, vinyl polybutadiene. Bonds (1,2- and 3,4-
By hydrogenating a polymer block having a bond content of about 25-85%,
An amorphous olefin block having a structure similar to that of an amorphous ethylene / butene copolymer is obtained.
The polymer part that is mainly composed of a diene compound and can be converted into a crystalline polyolefin by hydrogenation treatment, for example, vinyl bonds (contents of 1,2- and 3,4-bonds) of polybutadiene,
By hydrogenating a polymer block of 25% or less, a crystalline olefin block having a structure similar to an ethylene polymer can be obtained.
As such a block copolymer (A2), specifically, crystalline olefin (crystalline ethylene polymer part) -ethylene butene (amorphous olefin polymer part) -crystalline olefin (crystalline ethylene polymer) Part) block copolymer (CEBC), styrene-ethylene butene (amorphous olefin polymer part) -crystalline olefin (crystalline ethylene polymer part) block copolymer (SEBC), JSR Corporation Product name: DYNARON, DR6100P, DR6200P (CEBC), DR4600P, DR4630P (S
Various brands of EBC) are commercially available.
Other examples of the block copolymer (A2) include a propylene homopolymer or a crystalline propylene polymer mainly composed of propylene and a small amount of propylene and other α-olefin such as 1-butene. A crystalline olefin polymer part is obtained by living polymerization, and then an amorphous olefin polymer part is obtained by copolymerizing propylene and another α-olefin such as ethylene and 1-butene. Examples include α-olefin-propylene block copolymers.

[Ethylene / vinyl acetate copolymer (B)]
The ethylene / vinyl acetate copolymer (B) according to the present invention has a vinyl acetate content of 25 to 80.
It is a copolymer with ethylene in the range of wt%, preferably 30-80 wt%, more preferably 35-70 wt%. An ethylene / vinyl acetate copolymer having a vinyl acetate content of less than 25% by weight is mixed with the olefin block copolymer elastomer (A) and a tackifier (C) described later to form a laminated film as an adhesive composition. Even if it is used for the intermediate layer, good reseal strength may not be obtained. On the other hand, the ethylene / vinyl acetate copolymer exceeding 80% by weight is the olefin block copolymer elastomer (A) and the adhesive described later. Even if mixed with the imparting agent (C) and used as an adhesive composition in the intermediate layer of the laminated film, there is a possibility that good reseal strength cannot be obtained.
The ethylene / vinyl acetate copolymer (B) according to the present invention is mixed with the olefin-based block copolymer elastomer (A) and a tackifier (C) described later and has a film-forming ability as an adhesive composition. As far as MFR (melt flow rate; ASTM D-1238 load 2
160 g, temperature 190 ° C.) is not particularly limited, but is usually in the range of 0.5 to 20 g / 10 minutes, preferably 1 to 15 g / 10 minutes. From these, it is sufficient to select appropriately in consideration of extrusion lamination and coextrusion moldability.

[Tackifier (C)]
The tackifier (C) according to the present invention is a resinous substance that is generally produced and sold as a tackifier, specifically, coumarone resins such as coumarone and indene resins; phenol-formaldehyde resins and xylene-formaldehyde Phenolic resins such as resins;
Terpene resins such as phenol resin, terpene resin (α, β-pinene resin), aromatic modified terpene resin, hydrogenated terpene resin; synthetic polyterpene resin, aromatic hydrocarbon resin, aliphatic hydrocarbon resin, aliphatic Cyclic hydrocarbon resin, aliphatic / alicyclic petroleum resin, aliphatic
Petroleum hydrocarbon resins such as aromatic petroleum resins, unsaturated hydrocarbon polymers, hydrogenated hydrocarbon resins, and hydrocarbon tackifying resins; rosin pentaerythritol ester, rosin glycerin ester, hydrogenated rosin, Examples thereof include rosin derivatives such as hydrogenated rosin ester, special rosin ester, and rosin tackifier.
Among these, a hydrogenated hydrocarbon resin, a hydrogenated aliphatic cyclic hydrocarbon resin, a hydrogenated aliphatic / alicyclic petroleum resin having a softening point in the range of 70 ° C. or higher, preferably 70 to 130 ° C., Hydrogenated terpene resin, hydrogenated synthetic polyterpene resin and other hydrogenated resins, rosin pentaerythritol ester, rosin glycerin ester, hydrogenated rosin ester are olefin block copolymer elastomer (A) and ethylene / acetic acid This is preferred because of good compatibility with the vinyl copolymer (B). When the softening point is less than 70 ° C., the tack force is good, but the adhesive force and cohesive force are small, and when the softening point exceeds 130 ° C., the adhesive force and cohesive force are good, but the tack force is small. There is a risk of becoming.

[Adhesive composition]
The pressure-sensitive adhesive composition of the present invention is a composition comprising the olefin block copolymer elastomer (A), the ethylene / vinyl acetate copolymer (B), and the tackifier (C), preferably Is 10 to 80% by weight of the olefin block copolymer elastomer (A)
, More preferably in the range of 20 to 70% by weight, ethylene / vinyl acetate copolymer (B) 10 to
80% by weight, more preferably 20 to 70% by weight and tackifier (C) 10 to 40% by weight, more preferably 10 to 30% by weight [provided that (A) + (B) + (C ) = 100
Weight%. 〕It is in.
As the pressure-sensitive adhesive composition, olefin block copolymer elastomer (A), ethylene
A pressure-sensitive adhesive composition lacking any of the vinyl acetate copolymer (B) and the tackifier (C) is used for an intermediate layer between a thermoplastic resin (D) and a thermoplastic resin (E) described later, and is a laminated film. In such a case, the heat seal strength (initial opening strength) may be too strong, or the reseal strength may be insufficient, and the balance between easy opening properties and reseal strength may be lacking.
The pressure-sensitive adhesive composition of the present invention heats more by making the composition amounts of the olefin block copolymer elastomer (A), the ethylene / vinyl acetate copolymer (B) and the tackifier (C) within the above ranges. A laminated film having an easy-opening property and resealability excellent in the balance between the sealing strength (initial opening strength) and the resealing strength is obtained.
Either a pressure-sensitive adhesive composition of the present invention or an olefinic block copolymer elastomer (A) or an ethylene / vinyl acetate copolymer (B) that is a component of the pressure-sensitive adhesive composition, or both, a heat-resistant stabilizer, Various additives used in ordinary thermoplastic resins such as weathering stabilizers, UV absorbers, lubricants, slip agents, nucleating agents, anti-blocking agents, antistatic agents, antifogging agents, pigments, dyes, inorganic or organic fillers, etc. May be added within a range not impairing the object of the present invention.

[Thermoplastic resin (D)]
The thermoplastic resin (D) according to the present invention is various known thermoplastic resins, specifically, for example,
Polyolefin (polyethylene, polypropylene, polybutene, poly-4-methyl / 1-pentene, modified polyolefin graft-modified with unsaturated carboxylic acid or derivatives thereof), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, glycol modified polyethylene) Terephthalate, glycol-modified polybutylene terephthalate, etc.), polyamide (nylon-6, nylon-66, nylon-MXD6, etc.), polyvinyl chloride, polyimide, ethylene / vinyl alcohol copolymer,
Polyvinyl alcohol, polyacrylonitrile, polystyrene, acrylonitrile / styrene copolymer, acrylonitrile / butadiene / styrene copolymer, polycarbonate,
Ethylene / vinyl acetate copolymer (EVA), ethylene / (meth) acrylic acid copolymer or its ionomer, ethylene / (meth) acrylic acid ester copolymer, etc.
An acid (derivative) copolymer or a mixture thereof can be exemplified.
Polyolefins include ethylene high polymers such as high pressure low density polyethylene (HP-LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE) and high density polyethylene (HDPE) or ethylene and other α -Ethylene-based ethylene polymers (polyethylene) such as random copolymers with olefins; polypropylene (PP), propylene / ethylene random copolymers, propylene / ethylene / 1-butene random copolymers, propylene / ethylene copolymers A propylene-based polymer (polypropylene) mainly composed of propylene, such as a homopolymer of propylene such as 1-butene random copolymer, propylene / ethylene block copolymer, or a copolymer of propylene and another α-olefin; Poly 1-butene, 1-butene pro 1-butene mainly composed of 1-butene such as a pyrene random copolymer, a 1-butene homopolymer such as 1-butene / ethylene random copolymer, or a copolymer of 1-butene and another α-olefin. 4-butene polymer (polybutene); poly-4-methyl / 1-pentene, 4-methyl / 1-pentene / α-olefin random copolymer, etc.
4-methyl / 1-pentene heavy polymer mainly composed of 4-methyl / 1-pentene, such as a homopolymer of methyl / 1-pentene or a copolymer of 4-methyl / 1-pentene and other α-olefin Examples thereof include polyunion (poly-4-methyl / 1-pentene).
Such polyolefin may be partly or wholly graft-modified with an unsaturated carboxylic acid such as maleic acid or maleic anhydride or a derivative thereof. Also, depending on the combination with the thermoplastic resin (E) described later, these thermoplastic resins (D)
Among them, preferred are ethylene polymers such as MDPE and HDPE, propylene polymers, 4-methyl / 1-pentene polymers, polyesters, polyamides, polystyrenes, etc., which have a relatively high melting point (Tm) and rigidity. .
The thermoplastic resin (D) according to the present invention includes a heat resistance stabilizer, a weather resistance stabilizer, an ultraviolet absorber, a lubricant, a slip agent, a nucleating agent, an anti-blocking agent, an antistatic agent, an antifogging agent, a pigment, a dye, Various additives used in ordinary thermoplastic resins such as inorganic or organic fillers may be added within a range not impairing the object of the present invention.

[Thermoplastic resin (E)]
The thermoplastic resin (E) according to the present invention is the same as the thermoplastic resin (D). Various known thermoplastic resins, specifically, for example, polyolefins (polyethylene, polypropylene, polybutene, poly-4-methyl, etc.). -1-pentene, modified polyolefin graft-modified with unsaturated carboxylic acid or derivatives thereof), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, glycol-modified polyethylene terephthalate, glycol-modified polybutylene terephthalate, etc.), polyamide ( Nylon-6, nylon-66, nylon-MXD6, etc.), polyvinyl chloride, polyimide, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, polyacrylonitrile, polystyrene, acryloni Lil-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, polycarbonate, ethylene-vinyl acetate copolymer (EVA),
Ethylene / (meth) acrylic acid copolymer or its ionomer, ethylene / (meth)
Examples thereof include ethylene / acid (derivative) copolymers such as acrylic ester copolymers, and mixtures thereof.
As the polyolefin, the above-described ethylene polymer, propylene polymer, 1-butene polymer and the like can be used.
Among these thermoplastic resins (E), very low density polyethylene (VLDPE) having a melting point (Tm) in the range of 90 to 130 ° C., high pressure method low density polyethylene (HP-LDPE), linear low density polyethylene (LLDPE) And ethylene homopolymers such as medium density polyethylene (MDPE) or random copolymers of ethylene and other α-olefins; propylene / ethylene random copolymers having a melting point (Tm) in the range of 110 to 150 ° C., propylene -Random copolymers of propylene and other α-olefins such as ethylene / 1-butene random copolymer and propylene / 1-butene random copolymer; melting point (Tm) in the range of 75 to 125 ° C 1 -1-butene such as butene / propylene random copolymer, 1-butene / ethylene random copolymer and other α- Random copolymers with olefins; Ethylene / vinyl acetate copolymers (EVA), ethylene / (meth) acrylic acid copolymers, ethylene / (meth) acrylic acid ester copolymers, and ethylene / acids (derivatives) such as ionomers ) Copolymer; Amorphous or low crystalline polyester having a melting point in the range of 70 to 180 ° C .; Styrenic polymer such as acrylonitrile / styrene copolymer, acrylonitrile / butadiene / styrene copolymer; A thermoplastic resin having excellent properties is preferred. These thermoplastic resins may be used alone or as a composition of two or more.
Such a thermoplastic resin (E) has a low crystalline or amorphous ethylene / α-olefin random copolymer, propylene /
Copolymers called so-called elastomers such as α-olefin random copolymers may be added.
The thermoplastic resin (E) according to the present invention includes a heat resistance stabilizer, a weather resistance stabilizer, an ultraviolet absorber, a lubricant, a slip agent, a nucleating agent, an anti-blocking agent, an antistatic agent, an antistatic agent, respectively. Various additives usually used in thermoplastic resins such as clouding agents, pigments, dyes, inorganic or organic fillers, etc. may be added within the range not impairing the object of the present invention.

[Laminated film]
The laminated film of the present invention comprises a heat seal layer (thermomelt) made of the thermoplastic resin (E) on one side of a laminate layer made of the thermoplastic resin (D) via an intermediate layer made of the pressure-sensitive adhesive composition. Is a laminated film obtained by laminating a layer. Each of the laminate layer and the heat seal layer may be a single layer or a multilayer of two or more layers. The laminated film of the present invention is
Not only film form but tape form may be sufficient.
The thickness of the laminated film of the present invention can be determined depending on various applications, but the thickness of the laminate layer is usually 1 to 100 μm, more preferably 5 to 60 μm, and the thickness of the intermediate layer made of the pressure-sensitive adhesive composition is 1 to 498 μm. , More preferably 1 to 94 μm, the thickness of the heat seal layer is 1 to 20 μm,
More preferably, it exists in the range of 1-10 micrometers.
In order to improve the printability or adhesion to other films, slipperiness, etc., the laminated film of the present invention can be treated with, for example, corona treatment, flame treatment, plasma treatment, undercoat treatment, etc. An activation process may be performed.
Further, depending on the use, a base material layer described later can be bonded to the laminate layer of the laminated film of the present invention and used for various purposes.

[Base material layer]
The base material layer according to the present invention is a sheet-like or film-like material made of a thermoplastic resin, paper,
Made of aluminum foil or the like. As the thermoplastic resin, as with the thermoplastic resin (D) or the thermoplastic resin (E), various known thermoplastic resins, specifically, for example, polyolefin (polyethylene, polypropylene, polybutene, poly-4-methyl・ 1-pentene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, nylon-M)
XD6, etc.), polyvinyl chloride, polyimide, ethylene / vinyl alcohol copolymer, polyvinyl alcohol, polyacrylonitrile, polycarbonate, polystyrene, ethylene / vinyl acetate copolymer (EVA), ethylene / (meth) acrylic acid copolymer or Examples thereof include an ionomer, an ethylene / (meth) acrylic acid ester copolymer, an ethylene / acid (derivative) copolymer such as an ionomer, or a mixture thereof.
Of these, thermoplastic resins having good stretchability and transparency, such as polypropylene, polyethylene terephthalate, and polyamide, are preferable. In addition, the base material layer made of such a thermoplastic resin film may be an unstretched film or a stretched film.
It may be a laminate such as a co-extruded product of more than seeds, an extruded laminate product, a dry laminate product or the like.
Among these base material layers, a biaxially stretched film made of polypropylene, polyethylene terephthalate, polyamide or the like is preferable because it is excellent in transparency and rigidity.
In order to impart gas barrier properties to these base material layers, a metal such as aluminum or zinc or an inorganic oxide such as aluminum oxide, zinc oxide, or silicon oxide (silica) may be deposited.
In order to improve the adhesiveness between one side or both sides of the base material layer and the laminate layer of the laminated film of the present invention, for example, corona treatment, flame treatment, plasma treatment, undercoat treatment, primer coat treatment, flame treatment, etc. A surface activation treatment may be performed. The thickness of the base material layer is usually 5 to 1000 μm, preferably 9 to 100 μm.
As a specific configuration example of a laminate comprising the base material layer and the laminate film of the present invention, for example, biaxially stretched polyethylene terephthalate film (PET) / laminate film [laminate layer / adhesive comprising thermoplastic resin (D) Intermediate layer composed of the agent composition / heat seal layer composed of the thermoplastic resin (E)], PET / PET / laminated film, PET / aluminum foil / laminated film, PET / deposited PET / laminated film, transparent deposited PET / laminated film , Biaxially stretched polyamide film (ONY) / laminated film, ONY / ethylene / vinyl alcohol copolymer film / laminated film, and transparent deposited PET / ONY / laminated film. When the base material layer and the laminated film are bonded to each other in such a laminate, as described above, for example, a method of dry laminating using a urethane-based dry laminating adhesive, a high-pressure polyethylene or the like is used as the base material layer and the laminated film. Various known methods such as an extrusion laminating method of extruding and laminating between the two can be adopted. Moreover, the printing layer may be provided between the base material layer and the laminated film.

[Production method of laminated film]
The laminated film of the present invention can be produced by various known methods.
For example, a film to be a laminate layer made of a thermoplastic resin (D) and a film to be a heat seal layer made of a thermoplastic resin (E) are separately obtained in advance, and then the adhesive composition is melt-extruded and laminated. A so-called sand laminating method in which a film to be a layer and a film to be a heat seal layer are laminated and laminated; a film to be a laminate layer previously made of a thermoplastic resin (D) or a heat seal layer made of a thermoplastic resin (E) After obtaining a film to be obtained, a thermoplastic resin (E) and an adhesive composition, or a thermoplastic resin (
D) and a pressure-sensitive adhesive composition are co-extruded, and the pressure-sensitive adhesive composition layer and the film are laminated to form a so-called co-extrusion laminating method; a film to be a laminate layer previously made of a thermoplastic resin (D) A film comprising a thermoplastic resin (E) and a film comprising a pressure-sensitive adhesive composition and a film comprising a pressure-sensitive adhesive composition are obtained separately, and the film comprising the pressure-sensitive adhesive composition is used as an intermediate layer, using an adhesive. A so-called dry laminating method in which a film that becomes a laminate layer made of a thermoplastic resin (D) and a film that becomes a heat seal layer made of a thermoplastic resin (E) are laminated together; or a thermoplastic resin (D ), The thermoplastic resin (E) and the pressure-sensitive adhesive composition are co-extruded using a multilayer die having three or more layers so that the pressure-sensitive adhesive composition becomes an intermediate layer, so-called co-extrusion It may be prepared by molding or the like.
Among these production methods, the coextrusion molding method is most preferable because the thickness of each layer can be controlled uniformly and accurately.
The coextrusion molding may be either a casting method using a flat die such as a T-die or an inflation method using a circular die.

[Container lid]
The container lid material of this invention consists of the said laminated | multilayer film. When the laminated film of the present invention is used as a container lid, only the laminated film may be used as a lid, or the base material layer is bonded to the laminated layer of the laminated film to form a heat seal layer of the laminated film. You may use as an inner surface (fusion layer).
As a specific configuration of such a container lid member, a laminate comprising the substrate layer and the laminated film of the present invention can be used.
Various known containers can be used as the container to which the container lid material of the present invention is applied as long as it is a heat-sealable container. Specifically, for example, a sheet made of a thermoplastic resin such as a propylene polymer, an ethylene polymer, a styrene polymer, polyester, polyamide or the like, a tray, a cup, a bottle, or the like, or an ethylene heavy Examples include those having the above-mentioned shape made of paper in which a coalescence is laminated on the inner surface. The container made of thermoplastic resin may be a single layer or a laminate composed of two or more kinds of thermoplastic resins.
As such a container, a container made of a propylene polymer has a good balance between heat resistance and appropriate flexibility, and is excellent in combination with the container lid material of the present invention.

[Packaging]
The package of the present invention is a package comprising at least one of the laminated films. In such a package, at least one is a laminated film, and if necessary, a three-sided sealing bag formed of two laminated films in which a base material layer is bonded to the laminated layer surface of the laminated film.
After filling the contents), fill the packaging material into a four-sided sealed package with the mouth heat-sealed, or a two-side sealed bag with the side film folded and sealed, and then heat-seal the mouth The three-way seal packaging body formed can be mentioned.
The packaging body of the present invention is not limited to the above-described form, and after the packaging material is filled in a container such as a film, a sheet, a tray, a cup, and a bottle having a heat-sealing layer that can be thermally fused, the laminated film And a package body formed by sealing the upper surface (mouth) with a container lid material (sealing material) made of
Moreover, the package of this invention may have a tape-shaped laminated film affixed to at least one of the part used as an opening part.

Hereinafter, the present invention will be described based on examples, but the present invention is not limited to these examples without departing from the gist of the invention.

[Method for evaluating physical properties]
Various test methods and evaluation methods in the present invention are as follows.
(1) Heat seal strength;
Before measuring the heat seal strength, a laminated layer of a laminated film subjected to corona treatment and a polyethylene terephthalate biaxially stretched film having a thickness of 12 μm are made of a urethane-based adhesive (Mitsui Takeda Chemicals: trade name “Takelac A616” (50% ) + “Takelac A65” (3
. 13%) + ethyl acetate (46.87%)) and dry laminated to prepare a multilayer film.
The heat seal strength is measured using a heat sealer TP-701-B manufactured by Tester Sangyo Co., Ltd., with a heat seal layer of the laminated film and an unstretched polypropylene sheet having a thickness of 300 μm.
At each temperature, heat sealing was performed under conditions of a seal gauge pressure of 0.2 MPa, a time of 1 second, and a seal width of 5 mm. The heating was performed only on the upper side. Next, the heat-sealed test piece was cut into a width of 15 mm, and 500 m was measured using a Tensilon universal testing machine RTM-100 manufactured by Orientec Corporation.
Peeling was performed at a tensile speed of m / min, and the maximum strength was defined as heat seal strength. The measured value is an average value of 5 times. In addition to the heat seal strength, the peeled state of the heat seal opening was observed.
(2) Reseal strength;
The heat seal peeling surfaces of the test pieces for which the heat seal strength was measured were put together, and using a heat sealer TP-701-B manufactured by Tester Sangyo Co., Ltd., at a set temperature of 30 ° C., a seal gauge pressure of 1.
The heat seal peeled surfaces were resealed (resealed) under the conditions of 5 kg / m ² , time 1 second, and seal width 10 mm. The heating was performed from the upper and lower surfaces. Subsequently, the resealed test piece was peeled off at a tensile speed of 500 mm / min using a Tensilon universal testing machine RTM-100 manufactured by Orientec Co., and its maximum strength was defined as reseal strength. The measured value is the average value of the test pieces that could be resealed.
(3) Heat seal strength and reseal strength at low temperatures;
The measurement of the heat seal strength at a low temperature is performed by measuring the heat seal layer of the laminated film and the thickness of 300 μm.
m unstretched polypropylene sheet, heat sealer TP-701-B manufactured by Tester Sangyo Co., Ltd.
Was used for heat sealing under conditions of a seal gauge pressure of 0.2 MPa, a time of 1 second, a seal width of 5 mm, and a temperature of 200 ° C. The heating was performed only on the upper side. Next, the heat-sealed test piece was cut into a width of 15 mm, and a predetermined temperature was measured using an orientec Tensilon universal testing machine RTC-1225 in which a constant temperature bath TLF-R3-C for an orientec tensile tester was set. After 5 minutes, the film was peeled off at a tensile speed of 500 mm / min, and the maximum strength was defined as the heat seal strength. The measured value is an average value of 5 times.
In addition to the heat seal strength, the peeled state of the heat seal opening was observed.
The re-seal strength at low temperature is obtained by taking the test piece whose heat seal strength was measured at the above-mentioned predetermined temperature from the thermostatic bath, and then combining the peeled heat seal peel surfaces with each other, heat sealer TP-701-B manufactured by Tester Sangyo Co., Ltd. , Set temperature 30 ° C, seal gauge pressure 1.5kg /
The heat seal peeled surfaces were resealed under the conditions of m ² , time 1 second, and seal width 10 mm.
The heating was performed up and down. Next, the resealed test piece is immediately put in a thermostat, and a predetermined temperature is obtained using an orientec Tensilon universal tester RTC-1225 in which an orientec tensile tester TLF-R3-C is set. 500m after 2 minutes
Peeling was performed at a tensile speed of m / min, and the maximum strength was defined as reseal strength. The measured value is the average value of the test pieces that could be resealed.
(4) Melting point (Tm);
In accordance with JIS K 7121, the heating rate was measured at 10 ° C. per minute using DSC.

[Each raw material]
The polymers used in Examples and Comparative Examples are as follows.
(1) Olefin-based block copolymer elastomer (A)
(1-1) Styrene / diene block copolymer (A1)
(I) Hydrogenated product of styrene-butadiene-styrene block copolymer (SBS) (SE
BS)
Product name: “Clayton G1657”, MFR: 8 g
/ 10 minutes.
(1-2) Olefin / Amorphous Olefin Block Copolymer (A2)
(I) Styrene-ethylene-butene-crystalline olefin block copolymer (SEBC)
Product name: Dynaron 4600P, MFR: 5.6 g / 10 min (230 ° C., manufactured by JSR)
(2.16 kg, ASTM D1238)
(Ii) Crystalline olefin-ethylene-butene-crystalline olefin block copolymer (C
EBC)
JSR product name: Dynalon 6200P, MFR; 2.5 g / 10 min (230 ° C.,
(2.16 kg, ASTM D1238)
(2) Ethylene / vinyl acetate copolymer (B)
(I) Ethylene / vinyl acetate copolymer (40% EVA)
Vinyl acetate content: 40% by weight, density: 970 kg / m ³ , MFR: 2 g / 10 min.
(Ii) Ethylene / vinyl acetate copolymer (33% EVA)
Vinyl acetate content: 33% by weight, density: 960 kg / m ³ , MFR: 1 g / 10 min.
(3) Tackifier (C)
(I) Terpene resin, manufactured by Yasuhara Chemical Co., Ltd., trade name: “YS Resin PX1150N”, ring and ball method softening point; 11
5 ℃
(Ii) Alicyclic hydrocarbon resin, Arakawa Chemical Industries, trade name: “Arcon P115”, ring and ball method softening point: 115 ° C.
(4) Thermoplastic resin (D) (laminate layer resin)
(I) Polypropylene homopolymer (H-PP)
Product name: “Mitsui Polypro F107DV”, density: 910 kg / m ³ , melting point: 160 ° C., MFR: 7 g / 10 min.
(5) Thermoplastic resin (E) (heat seal layer resin)
(I) Propylene / ethylene / 1-butene random copolymer (R-PP)
Product name: “Mitsui Polypro F329D”, density: 910 kg / m ³ , melting point: 139 ° C., MFR: 9 g / 10 min.

<Example 1>
As a resin for the laminate layer, H-PP is used, and as an intermediate layer made of an adhesive composition,
SEBS: 40% by weight, 40% EVA; 40% by weight and terpene resin; 20% by weight, and a pressure-sensitive adhesive composition in which 0.1 part by weight of a phenolic antioxidant is uniformly mixed with a twin screw extruder,
R-PP is used as the resin for the heat seal layer, and it is 40
Each was put into 3 mmφ extruders, extruded from a feed block type T die at 210 ° C. at an extrusion temperature of 180-230 ° C., quenched with a casting roll at 30 ° C., and then subjected to corona treatment on the laminate layer, A laminated film was obtained.
The total thickness of the obtained laminated film was 50 μm, and the thickness of each layer was laminate layer / intermediate layer composed of pressure-sensitive adhesive composition / heat seal layer = 15/30/5 μm.
The evaluation results of the obtained laminated film are shown in Table 1.

<Example 2>
SEBS: 40% by weight, 40% EVA: 40% by weight, alicyclic hydrocarbon resin: 20% by weight, phenolic antioxidant; 0.1 parts by weight of biaxial extrusion as an intermediate layer comprising an adhesive composition A laminated film was obtained in the same manner as in Example 1 except that the resin uniformly mixed in the machine was used.
The evaluation results of the obtained laminated film are shown in Table 1.

<Example 3>
SEBS: 30% by weight, 40% EVA; 50% by weight, terpene resin; 20% by weight, phenolic antioxidant; 0.1 parts by weight uniformly with a twin-screw extruder as an intermediate layer comprising an adhesive composition A laminated film was obtained in the same manner as in Example 1 except that the mixed resin was used.
The evaluation results of the obtained laminated film are shown in Table 1.

<Example 4>
SEBS: 30% by weight, 40% EVA: 50% by weight, alicyclic hydrocarbon resin: 20% by weight, phenolic antioxidant; 0.1 parts by weight of biaxial extrusion as an intermediate layer comprising an adhesive composition A laminated film was obtained in the same manner as in Example 1 except that the resin uniformly mixed in the machine was used.
The evaluation results of the obtained laminated film are shown in Table 1.

<Example 5>
SEBS: 20% by weight, 40% EVA: 60% by weight, alicyclic hydrocarbon resin: 20% by weight, phenolic antioxidant; 0.1 parts by weight of biaxial extrusion as an intermediate layer comprising an adhesive composition A laminated film was obtained in the same manner as in Example 1 except that the resin uniformly mixed in the machine was used.
The evaluation results of the obtained laminated film are shown in Table 1.

<Example 6>
SEBS: 40% by weight, 33% EVA; 40% by weight, alicyclic hydrocarbon resin: 20% by weight, phenolic antioxidant; 0.1 parts by weight of biaxial extrusion as an intermediate layer comprising an adhesive composition A laminated film was obtained in the same manner as in Example 1 except that the resin uniformly mixed in the machine was used.
The obtained laminated film evaluation results are shown in Table 1.

<Example 7>
SEBC: 30% by weight, 40% EVA; 50% by weight, terpene resin; 20% by weight, phenolic antioxidant; 0.1 parts by weight uniformly with a twin-screw extruder A laminated film was obtained in the same manner as in Example 1 except that the mixed resin was used.
The evaluation results of the obtained laminated film are shown in Table 2.

<Example 8>
As an intermediate layer composed of the pressure-sensitive adhesive composition, CEBC: 30% by weight, 40% EVA; 50% by weight, terpene resin; 20% by weight, phenolic antioxidant; 0.1 parts by weight uniformly with a twin screw extruder A laminated film was obtained in the same manner as in Example 1 except that the mixed resin was used.
The evaluation results of the obtained laminated film are shown in Table 2.

<Comparative Example 1>
As an intermediate layer composed of the pressure-sensitive adhesive composition, 40% EVA; 80% by weight, alicyclic hydrocarbon resin; 20% by weight, phenolic antioxidant; 0.1 parts by weight were uniformly mixed with a twin screw extruder. A laminated film was obtained in the same manner as in Example 1 except that the resin was used.
The evaluation results of the obtained laminated film are shown in Table 2.

<Comparative example 2>
SEBS; 80% by weight, terpene resin; 20% by weight, phenolic antioxidant; a resin obtained by uniformly mixing 0.1 parts by weight with a twin screw extruder was used as an intermediate layer made of an adhesive composition. A laminated film was obtained in the same manner as in Example 1.
The evaluation results of the obtained laminated film are shown in Table 2.

<Comparative Example 3>
SEBC; 80% by weight, terpene resin; 20% by weight, phenolic antioxidant; a resin in which 0.1 part by weight is uniformly mixed with a twin-screw extruder is used as an intermediate layer made of an adhesive composition A laminated film was obtained in the same manner as in Example 1.
The evaluation results of the obtained laminated film are shown in Table 2.

<Comparative example 4>
As an intermediate layer composed of the pressure-sensitive adhesive composition, CEBC; 80% by weight, terpene resin; 20% by weight, phenolic antioxidant; except that a resin obtained by uniformly mixing 0.1 parts by weight with a twin screw extruder was used. A laminated film was obtained in the same manner as in Example 1.
The evaluation results of the obtained laminated film are shown in Table 2.

<Example 9>
Table 3 shows the evaluation results of the laminated film used in Example 1 under low temperature (10 ° C, 5 ° C, -10 ° C).

表１及び表２の実施例から明らかなように、中間層としてオレフィン系ブロック共重合
体エラストマー（Ａ）、酢酸ビニル含有量が２５〜８０重量％のエチレン・酢酸ビニル共
重合体（Ｂ）および粘着付与剤（Ｃ）を含んでなる粘着剤組成物を用いてなる積層フィル
ムを包装材料の蓋材等に用いた場合は、適度なヒートシール強度（開封時の強度）を有し
、開封した際に、粘着剤組成物層が凝集破壊し、繰返し再封止するに充分な強度（リシー
ル強度）を有する。また、ヒートシール条件を選ぶことにより、粘着剤組成物層が凝集破
壊した界面が白濁するので、改竄防止にも役立つ。
それに対し、中間層としてオレフィン系ブロック共重合体エラストマー（Ａ）を含まな
い組成物を用いたものはリシール強度が弱く、繰返し再封止しできないこと（比較例１）
が明らかであり、一方、エチレン・酢酸ビニル共重合体（Ｂ）を含まず、且つオレフィン
系ブロック共重合体エラストマー（Ａ）としてＳＥＢＳ及びＣＥＢＣを用いた組成物から
なる積層フィルムは、ヒートシール強度が強くなり易開封性に劣るとともに、リシール強
度が弱かったり（比較例２）、開封時にシール切れを起こし（比較例４）、また、オレフ
ィン系ブロック共重合体エラストマー（Ａ）としてＳＥＢＣ用いた組成物からなる積層フ
ィルム（比較例３）は、リシール強度も弱く、繰返し再封止しできず、いずれも易開封性
と繰返し再封止し得る包装材料としてもち得ないことが明らかである。

As is apparent from the examples in Tables 1 and 2, the olefinic block copolymer elastomer (A) as the intermediate layer, the ethylene / vinyl acetate copolymer (B) having a vinyl acetate content of 25 to 80% by weight, and When a laminated film using a pressure-sensitive adhesive composition containing a tackifier (C) is used as a lid for a packaging material or the like, it has an appropriate heat seal strength (strength at the time of opening) and is opened. At this time, the pressure-sensitive adhesive composition layer cohesively breaks and has sufficient strength (reseal strength) for repeated resealing. In addition, by selecting the heat seal condition, the interface where the pressure-sensitive adhesive composition layer is cohesively broken becomes cloudy, which is useful for preventing falsification.
On the other hand, those using a composition that does not contain the olefin block copolymer elastomer (A) as the intermediate layer have low reseal strength and cannot be resealed repeatedly (Comparative Example 1).
On the other hand, a laminated film comprising a composition that does not contain the ethylene / vinyl acetate copolymer (B) and uses SEBS and CEBC as the olefin block copolymer elastomer (A) has a heat seal strength. Composition becomes inferior in easy-opening property, reseal strength is weak (Comparative Example 2), seal breakage occurs at the time of opening (Comparative Example 4), and composition using SEBC as the olefin block copolymer elastomer (A) It is clear that the laminated film made of a product (Comparative Example 3) has low reseal strength and cannot be repeatedly resealed, and neither can be easily opened and cannot be used as a packaging material that can be resealed repeatedly.

Since the pressure-sensitive adhesive composition of the present invention is excellent in self-adhesiveness and does not deteriorate even if it is repeatedly peeled and adhered, it can be resealed by using it as an intermediate layer of a film made of a thermoplastic resin. Excellent packaging material is obtained.
The laminated film of the present invention heats a heat seal layer (heat seal layer) made of the thermoplastic resin (E) or a film or a container provided with such a heat seal layer and a heat seal layer heat sealable with the heat seal layer. After sealing (heat fusion), when the heat seal part is peeled off (opened), the heat seal layer breaks, and the adhesive composition layer excellent in self-adhesiveness of the intermediate layer is exposed on the peeled surface, preferably Since the pressure-sensitive adhesive composition layer is agglomerated and exposed to both peeled surfaces, again,
It has the feature that it can be resealed by pressing the peeled surface with a finger or the like, and has the advantage that there is little decrease in the Lee-seal strength even after repeated opening and bonding.
Utilizing such characteristics, it is suitable as a packaging material, particularly as a lid material for sheets, trays, cups, bottles, etc. made of propylene-based polymers, packaging for snacks such as rice crackers, potato chips, etc., or jelly, milk It can be suitably used as a packaging material for food packaging such as yogurt, pudding, tofu and lactic acid beverages, packaging for pharmaceuticals and medical instruments, blister packaging, and other daily necessities and miscellaneous goods.

Claims (16)

An adhesive comprising an olefin block copolymer elastomer (A), an ethylene / vinyl acetate copolymer (B) having a vinyl acetate content of 25 to 80% by weight, and a tackifier (C). Composition. 10-80 wt% of olefin block copolymer elastomer (A), 10-80 wt% of ethylene / vinyl acetate copolymer (B) having a vinyl acetate content of 25-80 wt%, and a tackifier (C ) Is 10 to 40% by weight [However, (A) + (B) + (C) = 100% by weight
And The pressure-sensitive adhesive composition according to claim 1. Olefin block copolymer elastomer (A) is a styrene / diene block copolymer (A1) and / or an olefin / amorphous olefin having at least one amorphous olefin polymer block and a crystalline olefin polymer block Block copolymer (A2)
The pressure-sensitive adhesive composition according to claim 1 or 2. The pressure-sensitive adhesive composition according to claim 3, wherein the styrene-diene block copolymer (A1) is a hydrogenated product. The hydrogenated styrene / diene block copolymer (A1) is at least one of a styrene-butadiene block copolymer, a styrene-butadiene-styrene block copolymer, and a styrene-isoprene-styrene block copolymer. The pressure-sensitive adhesive composition according to claim 4, which is a hydrogenated product of a block copolymer. The olefin / amorphous olefin block copolymer (A2) is any one of a styrene-ethylene / butene / crystalline olefin block copolymer and a crystalline olefin / ethylene / butene / crystalline olefin block copolymer. Item 4. The pressure-sensitive adhesive composition according to item 3. The pressure-sensitive adhesive composition according to any one of claims 1 to 6, wherein the tackifier (C) is at least one of a rosin derivative, a terpene resin, a petroleum resin, and a hydrogenated petroleum resin. The heat seal layer which consists of a thermoplastic resin (E) through the intermediate | middle layer which consists of an adhesive composition in any one of Claims 1-7 on the single side | surface of the laminate layer which consists of a thermoplastic resin (D) A laminated film characterized by being laminated.   The laminated film according to claim 8, wherein the thermoplastic resin (D) is a propylene-based polymer. The laminated film according to claim 8, wherein the thermoplastic resin (E) is a propylene / α-olefin random copolymer. After heat-sealing the heat-seal layer made of the thermoplastic resin (E) of the laminated film with another heat-sealable thermoplastic resin layer, when the heat-seal part is peeled off, the heat-seal layer breaks and an adhesive The laminated film according to any one of claims 8 to 10, wherein the intermediate layer made of the composition is cohesively broken, and the pressure-sensitive adhesive composition is exposed on both surfaces of the heat seal peeling portion.   A container lid made of the laminated film according to any one of claims 8 to 11. The package formed by heat-sealing the heat-sealing layers of the laminated | multilayer film of any one of Claims 8-11. The package body formed by heat-sealing the heat-seal layer of the laminated | multilayer film of any one of Claims 8-11, and the other thermoplastic resin layer which can be heat-sealed.   The package body formed by heat-sealing the container upper surface with the container cover material of Claim 12. When the package is opened, the heat sealing layer made of the thermoplastic resin (E) of the laminated film breaks and the intermediate layer made of the pressure sensitive adhesive composition cohesively breaks, and the pressure sensitive adhesive composition is formed on both sides of the heat seal peeling portion. The package according to any one of claims 13 to 15, wherein an object is exposed.