KR20070031344A - An adhesive compound composition, laminated film using it and uses thereof - Google Patents

Abstract

The present invention provides a pressure-sensitive adhesive composition having easy adhesiveness and suitable adhesiveness as a packaging material that can be resealed, and an easy-opening and repeatable resealable packaging material comprising a laminated film and a laminated film having the pressure-sensitive adhesive composition as an intermediate layer. The composition features the olefin block copolymer elastomer (A), the vinyl acetate content of 25-80 weight%, the ethylene-vinyl acetate copolymer (B), and a tackifier (C) consisting of. A laminated film comprising a pressure-sensitive adhesive composition as a basic composition and a laminate layer made of a thermoplastic resin (D) and a heat sealing layer made of a thermoplastic resin (E) are laminated through an intermediate layer made of the composition, and a container lid member made of the laminated film. Is in.

Hot sealing, easy opening, resealing, adhesion, laminated film, packaging, ethylene-vinyl acetate copolymer, container lid, peeling.

Description

Adhesive composition, laminated | multilayer film using the same, and its use {AN ADHESIVE COMPOUND COMPOSITION, LAMINATED FILM USING IT AND USES THEREOF}

The present invention relates to a pressure-sensitive adhesive composition having easy adhesiveness and suitable adhesiveness as a packaging material that can be resealed, and to a packaging material that can be repeatedly resealed with ease of opening consisting of a laminated film and a laminated film having the pressure-sensitive adhesive composition as an intermediate layer. It is about.

As a packaging material for snack confectionery such as whole cakes, potato chips or food packaging such as jelly, milk, yogurt, pudding, tofu, lactic acid beverage, plastic packaging, other medicines, medical equipment, daily necessities, sundries, etc. The package which sealed the plastic container of the cup form to tray form with the lid | cover material which consists of a plastic laminate film and an aluminum foil laminate film is employ | adopted widely. The physical properties required for such packaging materials are mechanical strengths that can withstand distribution channels, sealing strengths that can maintain hygiene, and good openness in use.

However, such a conventional packaging material is excellent in ease of opening, but in most cases, it is impossible to reseal (reseal) at all if it is opened once to take out the contents.

On the other hand, as a resealable packaging material, a lid member formed by bonding an outer substrate and an inner substrate through an adhesive layer is used, and a container (for example, Patent Document 1) that enables opening and closing by exposing the adhesive layer at the time of opening, adhesive Resealable using a pressure-sensitive adhesive consisting of a mixture of elastomers such as styrene-butadiene copolymer and ethylene-vinyl acetate copolymer and adhesion agents (tackifiers) such as terpene resins and petroleum hydrocarbon resins as layers. Adhesive layer as an intermediate | middle layer, such as a packaging material (for example, patent document 2 and patent document 3), or a multilayer film (for example, patent documents 4 and 5) which uses the adhesive using the hydrogenated substance of styrene-butadiene copolymer as an elastomer. Various methods of using have been suggested.

[Patent Document 1] Japanese Utility Model Publication No. 62-31422

[Patent Document 2] Japanese Patent Application Laid-Open No. 4-502588

[Patent Document 3] Japanese Unexamined Patent Publication No. 2002-301786

[Patent Document 4] Japanese Patent Application Laid-Open No. 2003-175567

[Patent Document 5] Japanese Patent Application Laid-Open No. 2004-58568

However, even when the laminated film which uses the adhesive composition which consists of elastomers, such as a styrene-butadiene copolymer, described in such a patent document, and a tackifier, such as a terpene resin, as an intermediate | middle layer, is used as an easy opening packaging material, when it opens, a surface resin layer and Whether the adhesive resin layer or the heat sealing resin layer and the adhesive resin layer are separated from each other, or whether the adhesive force of the adhesive resin layer is not sufficient yet, or the heat sealing strength (initial opening strength) is too high. It was found that the ease of opening and the resealing strength could not be balanced due to insufficient counting or resealing strength.

Accordingly, an object of the present invention is to obtain a packaging material having heat sealability, ease of opening, repeated resealability and excellent resealability, and a balance between ease of opening and resealability.

The present invention provides an adhesive composition 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), Laminated film, container lid material consisting of a laminated film, characterized in that the heat-sealing layer made of thermoplastic resin (E) is laminated on one side of the laminate layer made of thermoplastic resin (D) through an intermediate layer made of such an adhesive composition, It is providing the container which uses the package which consists of laminated | multilayer film, and a container lid | cover material.

Summary of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, the requirements which comprise this invention are demonstrated.

[Olefin-Based 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 and at least one so-called hard segment composed of at least one olefin elastomer polymer portion in a molecule. The soft segment which consists of an olefin elastomer polymer part is a random polymer part of alpha-olefins, such as ethylene, propylene, and 1-butene, the polymer part of diene compounds (diolefin), such as butadiene and isoprene, or its hydrogenated substance, Usually, a glass transition point, such as a polystyrene polymer part, has crystallinity in the polymer part whose normal temperature is more than normal temperature, alpha-olefin polymer parts, such as ethylene, propylene, 1-butene, or a hydrogenated substance of butadiene polymer part.

Preferred examples of such an olefinic block copolymer elastomer (A) include a soft segment composed of at least one diene block (diene polymer portion; diolefin polymer portion) and a hard segment composed of at least one styrene block (styrene polymer portion). Having a soft segment consisting of a styrene-diene block copolymer (A1) having at least one amorphous olefin block (amorphous olefin polymer part) and a hard segment consisting of at least one crystalline olefin block (crystalline olefin polymer part) Olefin-amorphous olefin block copolymers (A2) can be exemplified, and these block copolymers are generally manufactured 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 styrene block (styrene polymer portion), manufactured and sold as a so-called thermoplastic elastomer. As a kind of block copolymer currently used, specifically, for example, a styrene-butadiene block copolymer (SB), a styrene-butadiene-styrene block copolymer (SBS), a styrene-isoprene block copolymer (SI), and a styrene- Isoprene-styrene block copolymer (SIS) or the hydrogenated substance of these block copolymers is mentioned. The hydrogenated substance may be a block copolymer in which both the styrene block and the diene block are hydrogenated, or a partial hydrogenated substance such as a block copolymer in which only the diene block is hydrogenated or a block copolymer in which a part of the styrene block and the diene block is hydrogenated. .

When using these block copolymers or its hydrogenated substance as an adhesive composition, you may use individually or in 2 or more types.

Among these block copolymers, a hydrogenated substance of styrene-butadiene block copolymer (SB), a hydrogenated substance of styrene-butadiene-styrene block copolymer (SBS), a hydrogenated substance of styrene-isoprene-styrene block copolymer (SIS), and a styrene- The hydrogenated substance of the block copolymer containing styrene blocks and diene blocks, such as the hydrogenated substance of isoprene block copolymer (SI), and more specifically, the styrene- which is a hydrogenated substance of a styrene-butadiene block copolymer (SB) Hydrogen of ethylene-butene block copolymer (SEB), styrene-butadiene-styrene block copolymer (SBS), hydrogen of styrene-ethylenebutene-styrene block copolymer (SEBS), styrene-isoprene-styrene block copolymer (SIS) As an additive, styrene-ethylene propylene-styrene block copolymer (SEPS) has excellent thermal stability during extrusion molding, stability during processing and generation of deterioration products, It is most preferable at the point which suppresses generation of a bad smell.

The styrene-diene block copolymer (A1) which concerns on this invention is MFR (melt flow rate) as long as the adhesive composition formed by mixing with the ethylene-vinyl acetate copolymer (B) and tackifier (C) which are mentioned later has film forming ability; ASTM D-1238 load 5kg, temperature 200 ℃) 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.

Olefin-Amorphous Olefin Block Copolymer (A2)

The olefin-amorphous olefin block copolymer (A2) according to the present invention consists of a soft segment consisting of one amorphous olefin block (amorphous olefin polymer part) and a crystalline olefin block (crystalline olefin polymer part) in at least a molecule. It is a block copolymer which has a hard segment, and is a kind of block copolymer manufactured and marketed as what is called a thermoplastic elastomer.

The structure of the olefin-amorphous olefin block copolymer (A2) is not particularly limited as long as it has at least one of an amorphous olefin block A and a crystalline olefin block B in the molecule, and (BA) n ₁ , (BA) n ₂ Examples of -B, (AB) n ₃ -A (n ₁ , n ₂ , n ₃ are integers of 1 or more) or a structure in which these are bonded with a coupling agent are illustrated. Among them, copolymers of triblocks or copolymers having a higher number of blocks are suitable.

As such a block copolymer (A2), specifically, the polymer block mainly having a diene compound, or these polymer blocks by hydroprocessing is made into the amorphous olefin block which has a structure similar to an ethylene-butene copolymer and an ethylene-propylene copolymer. The block copolymer which has the soft segment which consists of a hard segment which consists mainly of a diene compound, and a polymer part which can become a crystalline polyolefin by hydrogenation treatment etc. can be illustrated. Moreover, the block copolymer which substituted the hard segment which consists of polymer parts of vinyl aromatic compounds, such as styrene, a part of the polymer part which mainly becomes a diene compound and can become crystalline polyolefin by hydrogenation treatment etc. can be illustrated. 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.

A soft segment composed of an amorphous olefin block having a structure similar to that of an ethylene-butene copolymer or an ethylene-propylene copolymer by subjecting a polymer block mainly composed of a diene compound to hydrogenation, may be, for example, a vinyl bond of polybutadiene (1, By hydrogenating a polymer block having a content of 2- and 3,4-bonds of about 25 to 85%, an amorphous olefin block having a structure similar to that of the amorphous ethylene-butene copolymer can be obtained.

The polymer portion mainly composed of a diene compound and capable of becoming a crystalline polyolefin by hydrogenation or the like is, for example, a polymer having a polybutadiene vinyl bond (content of 1,2- and 3,4-bonds) of 25% or less. By hydrogenating the block, a crystalline olefin block having a structure similar to that of the ethylene polymer can be obtained.

As such a block copolymer (A2), Specifically, crystalline olefin (crystalline ethylene polymer part)-ethylene butene (noncrystalline olefin polymer part)-crystalline olefin (crystalline ethylene polymer part) block copolymer (CEBC), Styrene-ethylene butene (non-crystalline olefin polymer part)-crystalline olefin (crystalline ethylene polymer part) block copolymer (SEBC) is mentioned, and brand name from JSR Corporation: DR6100P, DR6200P (CEBC), DR4600P, DR4630P as DYNARON. Various brands of (SEBC) are commercially available.

As another example of the block copolymer (A2), a crystalline olefin is obtained by living polymerization of a propylene homopolymer or a propylene propylene polymer mainly composed of propylene of a small amount of propylene with other olefins such as ethylene or 1-butene. And a propylene-propylene-α-olefin-propylene block copolymer obtained by copolymerizing propylene with other α-olefins such as ethylene and 1-butene to obtain an amorphous olefin polymer portion.

[Ethylene-Vinyl Acetate Copolymer (B)]

The ethylene-vinyl acetate copolymer (B) according to the present invention has an air content with ethylene having a vinyl acetate content in the range of 25 to 80% by weight, preferably 30 to 80% by weight, more preferably 35 to 70% by weight. It is coalescing. The ethylene-vinyl acetate copolymer having a vinyl acetate content of less than 25% by weight may be mixed with the olefinic block copolymer elastomer (A) and the tackifier (C) described later to be used as an adhesive composition for the intermediate layer of the laminated film. The sealing strength may not be obtained, and on the other hand, the ethylene-vinyl acetate copolymer exceeding 80% by weight may be mixed with the olefinic block copolymer elastomer (A) and the tackifier (C) described later as an adhesive composition. Even if it is used for the intermediate | middle layer of laminated | multilayer film, there exists a possibility that a favorable resealing strength may not be obtained.

The ethylene-vinyl acetate copolymer (B) according to the present invention is mixed with the olefinic block copolymer elastomer (A) and the tackifier (C) described below, so long as it has a film forming ability as an adhesive composition, MFR (melt flow rate) ASTM D-1238 load 2160 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. What is necessary is just to select suitably from these in consideration of extrusion lamination and coextrusion moldability.

[Tackifier (C)]

The tackifier (C) which concerns on this invention is generally a resin-type substance manufactured and sold as a tackifier, Specifically, Coumarone resins, such as a coumarone indene resin; Phenol resins such as phenol formaldehyde resin and xylene formaldehyde resin; Terpene-based resins such as terpene phenol resins, terpene resins (α, β-pinene resins), aromatic modified terpene resins, and hydrogenated terpene resins; Synthetic polyterpene resins, aromatic hydrocarbon resins, aliphatic hydrocarbon resins, aliphatic cyclic hydrocarbon resins, aliphatic / alicyclic petroleum resins, aliphatic / aromatic petroleum resins, unsaturated hydrocarbon polymers, hydrogenated hydrocarbon resins and hydrocarbons Petroleum hydrocarbon resins such as hydrogen tackifying resins; Rosin derivatives such as pentaerythritol ester of rosin, glycerin ester of rosin, hydrogenated rosin, hydrogenated rosin ester, special rosin ester, and rosin tackifier; Etc. can be illustrated.

Among these, a hydrogenated hydrocarbon resin, a hydrogenated aliphatic cyclic hydrocarbon resin, a hydrogenated aliphatic / alicyclic petroleum resin, a hydrogenated terpene resin, and a hydrogen having a softening point of 70 ° C. or higher, preferably 70 to 130 ° C. Hydrogenated resins such as added synthetic polyterpene resins, pentaerythritol esters of rosin, glycerin esters of rosin, and hydrogenated rosin esters are compatible with olefin block copolymer elastomers (A) and ethylene-vinyl acetate copolymers (B). It is preferable because it is good. A softening point of less than 70 ° C. is good for tack strength, but a small adhesive force and cohesive force, and a softening point of more than 130 ° C. is good for adhesive force and cohesive force, but there is a concern that the cohesion force becomes small.

[Adhesive Composition]

The pressure-sensitive adhesive composition of the present invention is a composition comprising the olefinic block copolymer elastomer (A), the ethylene-vinyl acetate copolymer (B) and the tackifier (C), preferably an olefinic block copolymer Elastomer (A) in the range of 10 to 80% by weight, more preferably 20 to 70% by weight, 10 to 80% by weight of the ethylene-vinyl acetate copolymer (B), more preferably in the range of 20 to 70% by weight and The tackifier (C) is in the range of 10 to 40% by weight, more preferably 10 to 30% by weight (wherein (A) + (B) + (C) = 100% by weight).

As the pressure-sensitive adhesive composition, the pressure-sensitive adhesive composition lacking any one of an olefin block copolymer elastomer (A), an ethylene-vinyl acetate copolymer (B), and a tackifier (C) includes a thermoplastic resin (D) and a thermoplastic resin ( When the laminated film is used for the intermediate layer between E), the heat sealing strength (initial opening strength) is too high or the resealing strength is insufficient, so that the ease of opening and the resealing strength may not be balanced.

The pressure-sensitive adhesive composition of the present invention has more heat-sealing strength (initial opening strength) by setting the composition amounts of the olefin block copolymer elastomer (A), the ethylene-vinyl acetate copolymer (B) and the tackifier (C) in the above ranges. And the laminated | multilayer film provided with the easy opening property and the resealing property which were excellent in the balance of the sealing strength can be obtained.

The heat stabilizer, weathering stabilizer, ultraviolet absorber, lubricant, slip agent in any one or both of the pressure-sensitive adhesive composition or the olefin block copolymer elastomer (A) or ethylene-vinyl acetate copolymer (B) which is a component of the pressure-sensitive adhesive composition of the present invention. You may add various additives used for normal thermoplastic resins, such as a nucleating agent, an anti blocking agent, an antistatic agent, an antifogging agent, a pigment, dye, an inorganic or organic filler, in the range which does not impair the objective of this invention.

[Thermoplastic resin (D)]

The thermoplastic resins (D) according to the invention are various known thermoplastic resins, specifically, for example, polyolefins (polyethylene, polypropylene, polybutene, poly 4-methyl-1-pentene, unsaturated carboxylic acids or derivatives thereof). Graft modified modified polyolefins, etc.), polyesters (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, glycol modified polyethylene terephthalate, glycol modified polybutylene terephthalate, etc.), polyamides (nylon-6, nylon -66, nylon-MXD6, etc.), polyvinyl chloride, polyimide, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, polyacrylonitrile, polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene aerial Copolymer, polycarbonate, ethylene-vinyl acetate copolymer (EVA), ethylene- (meth) acrylic acid copolymer, or Ethylene-acid (derivative) copolymers, such as this ionomer and ethylene- (meth) acrylic acid ester copolymer, a mixture thereof, etc. can be illustrated.

Examples of polyolefins include homopolymers of ethylene, such as high pressure low density polyethylene (HP-LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE), or random air of ethylene with other α-olefins. Ethylene polymers (polyethylene) mainly composed of ethylene such as copolymers; Homopolymers of propylene such as polypropylene (PP), propylene-ethylene random copolymers, propylene-ethylene-1-butene random copolymers, propylene-1-butene random copolymers, propylene-ethylene block copolymers, or other Propylene-based polymers (polypropylene) mainly composed of propylene such as copolymers with olefins; Mainly 1-butene such as homopolymer of 1-butene such as poly 1-butene, 1-butene-propylene random copolymer, 1-butene-ethylene random copolymer or copolymer of 1-butene with other α-olefin 1-butene polymer (polybutene) to be; Homopolymer of 4-methyl-1-pentene, such as poly 4-methyl-1-pentene, 4-methyl-1-pentene-α-olefin random copolymer, or 4-methyl-1-pentene with other α-olefins The 4-methyl-1- pentene type polymer (poly 4-methyl-1- pentene) etc. which mainly made 4-methyl-1- pentene, such as a copolymer, can be illustrated.

As described above, some or all of these polyolefins may be graft-modified with derivatives such as unsaturated carboxylic acids such as maleic acid or maleic anhydride or anhydrides thereof. Moreover, although it also depends on the combination with the thermoplastic resin (E) mentioned later, Ethylene type polymers, such as MDPE and HDPE which have comparatively high melting | fusing point (Tm) and rigidity among these thermoplastic resins (D), a propylene polymer, 4-methyl-1- Pentene-based polymers, polyesters, polyamides, polystyrenes, and the like are preferred.

In the thermoplastic resin (D) according to the present invention, ordinary thermoplastics such as heat stabilizers, weather stabilizers, ultraviolet absorbers, lubricants, slip agents, nucleating agents, anti blocking agents, antistatic agents, antifogging agents, pigments, dyes, inorganic or organic fillers, etc. You may add various additives used for resin in the range which does not impair the objective of this invention.

[Thermoplastic resin (E)]

The thermoplastic resin (E) according to the present invention is the same as the thermoplastic resin (D), and various known thermoplastic resins, specifically, for example, polyolefins (polyethylene, polypropylene, polybutene, poly 4-methyl-1-pentene, Modified polyolefins graft-modified with unsaturated carboxylic acids or derivatives thereof, polyesters (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, glycol modified polyethylene terephthalate, glycol modified polybutylene terephthalate, etc.), Polyamide (nylon-6, nylon-66, polymethyyleneadiamide, etc.), polyvinyl chloride, polyimide, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, polyacrylonitrile, polystyrene, acrylonitrile- Styrene copolymer, acrylonitrile-butadiene-styrene copolymer, polycarbonate, ethylene-vinyl acetate Ethylene-acid (derivative) copolymers, such as a copolymer (EVA), an ethylene- (meth) acrylic acid copolymer or its ionomer, and an ethylene- (meth) acrylic acid ester copolymer, a mixture thereof, etc. can be illustrated.

As the polyolefin, the above-described ethylene polymer, propylene polymer, 1-butene polymer and the like can be used in the same manner.

Among these thermoplastic resins (E), the melting point (Tm) is in the range of 90 to 130 ° C., ultra low density polyethylene (VLDPE), high pressure method low density polyethylene (HP-LDPE), linear low density polyethylene (LLPPE), and medium density polyethylene (MDPE). Ethylene homopolymers such as ethylene or random copolymers of ethylene with other α-olefins; Random propylene and other α-olefins such as propylene-ethylene random copolymer, propylene-ethylene-1-butene random copolymer and propylene-1-butene random copolymer having a melting point (Tm) in the range of 110 to 150 ° C. Copolymers; Random copolymers of 1-butene with other α-olefins such as 1-butene-propylene random copolymers and 1-butene-ethylene random copolymers having a melting point (Tm) in the range of 75 to 125 ° C; Ethylene-acid (derivative) copolymers such as ethylene-vinyl acetate copolymer (EVA), ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester copolymer and ionomer; Low crystalline polyester having an amorphous or melting point in the range of 70 to 180 ° C; Styrene polymers such as acrylonitrile-styrene copolymer and acrylonitrile-butadiene-styrene copolymer; Thermoplastic resins excellent in heat sealing properties, such as these, are preferable. These thermoplastic resins may be used alone or as two or more kinds of compositions.

In order to further improve low temperature heat sealability and easy opening, such a thermoplastic resin (E) has a copolymer, also called an elastomer, such as a low crystalline or amorphous ethylene-α-olefin random copolymer or a propylene-α-olefin random copolymer. May be added.

The thermoplastic resin (E) according to the present invention includes a heat stabilizer, a weather stabilizer, an ultraviolet absorber, a lubricant, a slip agent, a nucleating agent, an anti blocking agent, an antistatic agent, an antifog agent, a pigment, a dye, an inorganic or an organic compound, on each or any one of them. You may add the various additives used for normal thermoplastic resins, such as a filler, in the range which does not impair the objective of this invention.

[Laminated film]

The laminated | multilayer film of this invention is a laminated | multilayer film by which the heat-sealing layer (heat-sealing layer) which consists of said thermoplastic resin (E) is laminated | stacked on one surface of the laminated layer which consists of said thermoplastic resin (D) via the intermediate | middle layer which consists of said adhesive composition. to be. The laminate layer and the heat-sealing layer may each be a single layer or a multilayer of two or more layers.

Although the thickness of the laminated | multilayer film of this invention can be determined according to various uses, the thickness of a laminated layer is 1-100 micrometers, More preferably, 5-60 micrometers, The thickness of the intermediate | middle layer which consists of an adhesive composition is 1-498 micrometers, More preferably, 1-94 micrometers, the thickness of a heat sealing layer are 1-20 micrometers, More preferably, it exists in the range of 1-10 micrometers.

The laminated film of the present invention is subjected to surface activation treatment of the surface of the laminate layer by, for example, corona treatment, flame treatment, plasma treatment, undercoat treatment, etc., in order to improve printability or adhesion with other films, slipperiness, and the like. You may do it.

Moreover, depending on a use, the base material layer mentioned later can be stuck to the laminate layer of the laminated | multilayer film of this invention, and can also be used for various uses.

[Substrate layer]

The base material layer which concerns on this invention consists of a sheet form or film form which consists of thermoplastic resins, paper, aluminum foil, etc. As a thermoplastic resin, various well-known thermoplastic resins, like polyolefin (polyethylene, polypropylene, polybutene, poly-4-methyl-) similarly to the said thermoplastic resin (D) or the said thermoplastic resin (E), specifically, are mentioned, for example. 1-pentene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, polymethyyleneadiamide, etc.), polyvinyl chloride, Polyimide, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, polyacrylonitrile, polycarbonate, polystyrene, ethylene-vinyl acetate copolymer (EVA), ethylene- (meth) acrylic acid copolymer or ionomer thereof, ethylene- ( Meta) acrylic acid ester copolymers, ethylene-acid (derivative) copolymers such as ionomers, and mixtures thereof.

Among these, thermoplastic resins having good stretchability and transparency, such as polypropylene, polyethylene terephthalate, and polyamide, are preferable. The base layer made of such a thermoplastic resin film may be a non-stretched film or a stretched film, or may be a laminate of one kind or two or more kinds of coextruded articles, extruded laminate articles, and dry laminate articles.

Among these substrate layers, biaxially oriented films made of polypropylene, polyethylene terephthalate, polyamide and the like are preferred because they are excellent in transparency and rigidity.

In order to provide gas barrier property, these base material layers may deposit metals, such as aluminum and zinc, or inorganic oxides, such as aluminum oxide, zinc oxide, and silicon oxide (silica).

In order to improve the adhesiveness of one side or both sides of the base material layer with the laminate layer of the laminated film of the present invention, for example, the surface such as corona treatment, flame treatment, plasma treatment, undercoat treatment, primer coating treatment, frame treatment, etc. You may make an activation process. The thickness of a base material layer is 5 to 1000 micrometers normally, Preferably it exists in the range of 9-100 micrometers.

As a specific structural example of the laminated body which consists of such a base material layer and the laminated | multilayer film of this invention, it is a biaxially-stretched polyethylene terephthalate film (PET) / laminated film [it consists of a laminated layer / adhesive composition which consists of a thermoplastic resin (D), for example. Heat sealing layer consisting of an intermediate layer / thermoplastic resin (E)], PET / PET / laminated film, PET / aluminum foil / laminated film, PET / deposited PET / laminated film, transparent vapor-deposited PET / laminated film, biaxially oriented polyamide film (ONY) / laminated film, ONY / ethylene-vinyl alcohol copolymer film / laminated film, transparent vapor deposition PET / ONY / laminated film is mentioned. When the base material layer and the laminated film are bonded together in such a laminate, a method of dry lamination using, for example, an urethane-based dry laminate adhesive, high pressure polyethylene or the like is extruded between the base layer and the laminated film and glued together. Various well-known methods, such as an extrusion lamination method, can be employ | adopted. Moreover, you may provide a printing layer between a base material layer and a laminated | multilayer film.

[Manufacturing Method of Laminated Film]

The laminated | multilayer film of this invention can be manufactured by various well-known methods.

For example, after separately obtaining 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) separately, the pressure-sensitive adhesive composition is melt-extruded to form a film to be a laminate layer and So-called sand lamination method of laminating a film to be a heat-sealing layer; After obtaining a film to be a laminate layer made of a thermoplastic resin (D) or a film to be a heat sealing layer made of a thermoplastic resin (E), the thermoplastic resin (E) and the pressure-sensitive adhesive composition, or the thermoplastic resin (D) are formed on the film. A co-extrusion laminate method for coextrusion molding the pressure-sensitive adhesive composition with the pressure-sensitive adhesive composition layer and the film; After obtaining the film which becomes a laminated layer which consists of a thermoplastic resin (D), the film which becomes a heat-sealing layer consisting of a thermoplastic resin (E) separately, and the film which consists of an adhesive composition, respectively, makes a film which consists of an adhesive composition into an intermediate | middle layer, The so-called dry lamination method of laminating and laminating 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) with or without an adhesive; Alternatively, the thermoplastic resin (D), the thermoplastic resin (E), and the pressure-sensitive adhesive composition can be produced by a so-called coextrusion molding method or the like in which the pressure-sensitive adhesive composition is coextruded to form an intermediate layer using three or more multilayer dies.

Among these production methods, the coextrusion molding method is most preferable in that the thickness of each layer can be uniformly and precisely controlled.

Coextrusion molding may be either a cast method using a flat die such as a T die or an inflation method using a circular die.

[Container cover material]

The container lid | cover material of this invention consists of the said laminated | multilayer film. When the said laminated | multilayer film of this invention is used for a container lid | cover material, only a laminated | multilayer film may be used as a lid | cover material, the said base material layer is stuck to the laminate layer of a laminated | multilayer film, and the heat-sealing layer of a laminated | multilayer film is inside (fusion bonding). Layer).

As a specific structure of such a container lid | cover material, the laminated body which consists of the said base material layer and the laminated | multilayer film of this invention can be used.

As the container to which the container lid member of the present invention is applied, various known containers can be used as long as they are heat-sealed containers. Specifically, for example, a sheet having a shape such as a sheet, a tray, a cup, a bottle made of a thermoplastic resin such as a propylene polymer, an ethylene polymer, a styrene polymer, a polyester or a polyamide, or an ethylene polymer may be formed on the inner surface thereof. The thing which has the said shape made of laminated paper, etc. are mentioned. The thermoplastic resin container 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 of heat resistance and moderate flexibility, and is excellent in combination with the container lid member of the present invention.

[Packaging body]

The package of this invention is a package which consists of at least one of the said laminated | multilayer film. Such a package is filled with a packaged material (contents) in a three-way sealing bag formed of at least one of a laminated film and, if necessary, two laminated films in which a base material layer is bonded to the laminate layer side of the laminated film. The three way sealing package formed by heat-sealing a spout after filling a four-side sealing package formed by heat-sealing and the two way sealing bag which bend | folded the laminated | multilayer film and sealed the side part to be packaged material.

The packaging body of the present invention is not limited to the above form, and after filling the packaging material in a container such as a film, a sheet, a tray, a cup, or a bottle having a heat-sealing layer that can be heat-sealed, the container lid made of the laminated film And a package formed by sealing an upper surface (spout) with an ash (sealing material) or the like.

The present invention will be described below based on Examples, but the present invention is not limited to these Examples unless departing from the gist of the invention.

[Evaluation method of physical property]

Various test methods and evaluation methods in the present invention are as follows.

(1) heat seal strength;

The laminate layer of the laminated film subjected to the corona treatment and the polyethylene terephthalate biaxially stretched film having a thickness of 12 μm before the measurement of the heat sealing strength were urethane-based adhesive (manufactured by Mitsui Takeda Chemicals, Inc .: trade name "Takelac A616" (50%) + " The multilayer film was prepared by dry lamination using Takelac A65 "(3.13%) + ethyl acetate (46.87%).

The measurement of the heat sealing strength was performed by the tester Industry Co., Ltd. Using the production heat sealing TP-701-B, heat sealing was performed under conditions of a sealing gauge pressure of 0.2 MPa, a time of 1 second, and a sealing width of 5 mm at each temperature. On the other hand, heating was performed only at the upper side. Subsequently, the heat-sealed test piece was cut to a width of 15 mm, and Orientec Co., Ltd. It peeled at the tensile speed of 500 mm / min using the manufactured Tensilon universal testing machine RTM-100, and made the maximum strength into heat-sealing strength. The measured value is an average value of five times. In addition to the heat sealing strength, the peeling state of the heat sealing opening was observed.

(2) resealing strength;

The heat-sealing peeling surfaces of the test pieces whose heat-seal strength is measured are put together, and Tester Industry Co., Ltd. Using the production heat sealer TP-701-B, the heat-sealed peeling surfaces were resealed (resealed) under conditions of a sealing gauge pressure of 1.5 MPa, a time of 1 second, and a sealing width of 10 mm at a set temperature of 30 ° C. In addition, the heating was performed on both upper and lower sides. Subsequently, the resealed test pieces were prepared by Orientec Co., Ltd. It peeled at the tensile speed of 500 mm / min using the manufactured Tensilon universal testing machine RTM-100, and made the maximum strength into resealing strength. The measured value is the average value of the resealable test piece.

(3) heat seal strength and reseal strength at low temperatures;

The measurement of the heat-sealing strength under low temperature was carried out by the tester Industry Co., Ltd. It heat-sealed under the conditions of sealing gauge pressure 0.2MPa, time 1 second, sealing width 5mm, and temperature 200 degreeC using each manufactured heat sealer TP-701-B. On the other hand, heating was performed only at the upper side. Subsequently, the heat-sealed test piece was cut to a width of 15 mm, and Orientec Co., Ltd. Orientec Co., Ltd. with thermostat TLF-R3-C for manufacturing tensile tester 5 minutes after reaching predetermined temperature using Tensilon universal testing machine RTC-1225, it peeled at the tensile speed of 500 mm / min, and made the maximum strength into the heat-sealing strength. The measured value is an average value of five times.

In addition to the heat sealing strength, the peeling state of the heat sealing opening was observed.

The resealing strength under low temperature is obtained by taking out the test piece which measured the heat sealing strength at the predetermined temperature from the thermostat, and then combining the peeled hot sealing peeling surfaces with each other, and testing the Tester Industry Co., Ltd. Using the heat sealer TP-701-B, the heat-sealing peeling surfaces were resealed under conditions of a set temperature of 30 ° C, a sealing gauge pressure of 1.5 MPa, a time of 1 second, and a sealing width of 10 mm. In addition, heating was performed up and down. Subsequently, the resealed test piece was immediately placed in a thermostat, and Orientec Co., Ltd. Orientec Co., Ltd. with thermostat TLF-R3-C for manufacturing tensile tester After 2 minutes had elapsed after the predetermined temperature was obtained using a manufactured Tensilon universal testing machine RTC-1225, peeling was performed at a tensile speed of 500 mm / min, and the maximum strength thereof was used as the resealing strength. The measured value is the average value of the resealable specimen.

(4) melting point (Tm);

In accordance with JIS K 7121, a heating rate was measured at 10 ° C. per minute using DSC.

[Each raw material]

The polymer used in the Example and the comparative example is as follows.

(1) Olefin block copolymer elastomer (A)

(1-1) styrene-diene block copolymer (A1)

(i) Hydrogenated Additives (SEBS) of Styrene-Butadiene-Styrene Block Copolymer (SBS)

KRATON Polymer Japan, trade name; "KRATON G1657", MFR; 8 g / 10 minutes.

(1-2) Olefin-Amorphous Olefin Block Copolymer (A2)

(i) Styrene-ethylenebutene-crystalline olefin block copolymers (SEBC)

JSR manufactured, trade name; DYNALON 4600P, MFR; 5.6 g / 10 min (230 ° C., 2.16 kg, ASTM D1238)

(ii) crystalline olefin-ethylenebutene-crystalline olefin block copolymer (CEBC)

JSR manufactured, trade name; DYNALON 6200P, MFR; 2.5 g / 10 min (230 ° C., 2.16 kg, ASTMD 1238)

(2) Ethylene-vinyl acetate copolymer (B)

(i) Ethylene-Vinyl Acetate Copolymer (40% EVA)

Vinyl acetate content; 40 wt%, density; 970 kg / m ³ , MFR; 2 g / 10 min.

(ii) ethylene-vinyl acetate copolymer (33% EVA)

Vinyl acetate content; 33 wt%, density; 960 kg / m ³ , MFR; 1 g / 10 min.

(3) adhesion agent (C)

(i) terpene resin

Yasuhara Chemical Co., Ltd. Manufacture, trade name; "YS Resin PX1150N", Round ball softening point; 115 ℃

(ii) alicyclic hydrocarbon resins

Arakawa Chemical Industries, Ltd. Manufacture, trade name; Arkon P115, cyclone softening point; 115 ℃

(4) Thermoplastic resin (D) (laminate layer resin)

(i) Polypropylene Homopolymer (H-PP)

Mitsui Chemicals, Inc. Manufacture, trade name; Mitsui Polypro F107DV, density; 910 kg / m ³ , melting point; 160 ° C., MFR; 7 g / 10 minutes.

(5) Thermoplastic (E) (Heat-sealing layer resin)

(i) Propylene-ethylene-1-butene random copolymer (R-PP)

Mitsui Chemicals, Inc. Manufacture, trade name; Mitsui Polypro F329D, density; 910 kg / m ³ , melting point; 139 ° C., MFR; 9 g / 10 min.

<Example 1>

SE-BS as an intermediate | middle layer which consists of an adhesive composition using H-PP as resin for a laminated layer; 40 wt%, 40% EVA; 40 wt% and terpene resin; 40 mm diameter extruder * 3 of 3 types of 3 layer unstretched film forming machines using the adhesive composition which mixed 0.1 weight part of phenolic antioxidant to 20 weight% uniformly by the twin screw extruder, and using R-PP as resin for heat-sealing layers. It was put into the stand, and it extruded from the T die of the feed block system of 210 degreeC at the extrusion temperature of 180-230 degreeC, and quenched by the casting roll of 30 degreeC, and the laminated layer was corona-treated and the laminated film was obtained.

The total thickness of the obtained laminated | multilayer film was 50 micrometers, and the thickness of each layer was the intermediate | middle layer / heat-sealing layer which consists of a laminate layer / adhesive composition = 15/30/5 micrometers.

Table 1 shows the evaluation results of the obtained laminated film.

<Example 2>

SEBS as an intermediate | middle layer which consists of an adhesive composition; 40 wt%, 40% EVA; 40% by weight, alicyclic hydrocarbon resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

Table 1 shows the evaluation results of the obtained laminated film.

<Example 3>

SEBS as an intermediate | middle layer which consists of an adhesive composition; 30 wt%, 40% EVA; 50 wt%, terpene resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

Table 1 shows the evaluation results of the obtained laminated film.

<Example 4>

SEBS as an intermediate | middle layer which consists of an adhesive composition; 30 wt%, 40% EVA; 50 wt%, cycloaliphatic hydrocarbon resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

Table 1 shows the evaluation results of the obtained laminated film.

<Example 5>

As an intermediate | middle layer which consists of an adhesive composition, SEBS; 20% by weight, 40% EVA; 60 wt%, alicyclic hydrocarbon resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

Table 1 shows the evaluation results of the obtained laminated film.

<Example 6>

SEBS as an intermediate | middle layer which consists of an adhesive composition; 40 wt%, 33% EVA; 40% by weight, alicyclic hydrocarbon resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

The obtained laminated film evaluation result is shown in Table 1.

<Example 7>

SEBC as an intermediate | middle layer which consists of an adhesive composition; 30 wt%, 40% EVA; 50 wt%, terpene resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

The evaluation result of the obtained laminated | multilayer film is shown in Table 2.

<Example 8>

CEBC as an intermediate | middle layer which consists of an adhesive composition; 30 wt%, 40% EVA; 50 wt%, terpene resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

The evaluation result of the obtained laminated | multilayer film is shown in Table 2.

Comparative Example 1

40% EVA as an intermediate | middle layer which consists of an adhesive composition; 80 wt%, cycloaliphatic hydrocarbon resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

The evaluation result of the obtained laminated | multilayer film is shown in Table 2.

Comparative Example 2

SEBS as an intermediate | middle layer which consists of an adhesive composition; 80 wt%, terpene resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

The evaluation result of the obtained laminated | multilayer film is shown in Table 2.

Comparative Example 3

SEBC as an intermediate | middle layer which consists of an adhesive composition; 80 wt%, terpene resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

The evaluation result of the obtained laminated | multilayer film is shown in Table 2.

<Comparative Example 4>

CEBC as an intermediate | middle layer which consists of an adhesive composition; 80 wt%, terpene resin; 20% by weight, phenolic antioxidant; A laminated film was obtained in the same manner as in Example 1, except that resin in which 0.1 parts by weight was uniformly mixed with a twin screw extruder was used.

The evaluation result of the obtained laminated | multilayer film is shown in Table 2.

Example 9

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

As is clear from the examples of Tables 1 and 2, an olefinic block copolymer elastomer (A) as an intermediate layer, an ethylene-vinyl acetate copolymer (B) having a vinyl acetate content of 25 to 80% by weight, and a tackifier (C) In the case of using a laminated film made of a pressure-sensitive adhesive composition comprising a), such as a lid material of a packaging material, etc., it has an appropriate heat-sealing strength (strength at the time of opening), and when opened, the pressure-sensitive adhesive composition layer coagulates and breaks and is repeatedly resealed. It has sufficient strength (reseal strength). In addition, since the interface in which the pressure-sensitive adhesive composition layer is cohesive-broken by selecting heat sealing conditions is cloudy, it is also helpful in preventing forgery.

In contrast, the use of a composition containing no olefinic block copolymer elastomer (A) as an intermediate layer is apparently low in heat sealing strength and low in resealing strength, and thus cannot be repeatedly resealed (Comparative Example 1). On the other hand, the laminated film which does not contain the ethylene-vinyl acetate copolymer (B) and consists of a composition using SEBS and CEBC as the olefinic block copolymer elastomer (A) has a high heat sealing strength, which leads to poor ease of opening and resealing. The laminated film (Comparative Example 3) made of a composition having a weak strength (Comparative Example 2) or a sealing break upon opening (Comparative Example 4), and using SEBC as the olefin block copolymer elastomer (A), was resealed. It was also found that the strength was weak and the re-sealing could not be repeated, and both were not suitable as packaging materials having easy opening and repeat re-sealing properties.

The adhesive composition of this invention has the outstanding characteristic of having easy adhesiveness, and having moderate adhesiveness suitable as a packaging material which can be resealed. By using these properties as a packaging material, a film obtained by laminating a laminate layer made of a thermoplastic resin and a heat seal layer made of a thermoplastic resin using the composition as an intermediate layer is excellent in heat sealability and is heat sealed (heat sealing). When opening the sealed package, it has easy heat-sealing strength (peel strength), so that it is easy to open, and when it is opened, the heat-sealing layer is broken, and the heat-sealing layer and the pressure-sensitive adhesive layer are interfacial peeled or pressure-sensitive adhesive composition between layers. The layer is broken or the pressure-sensitive adhesive composition layer is also broken, and the pressure-sensitive adhesive composition layer of the intermediate layer is exposed to the opening surface by interfacial peeling between the layers between the pressure-sensitive adhesive composition layer and the laminate layer, and the pressure-sensitive adhesive composition layer is excellent in self-adhesiveness. It has enough adhesion just by pressing, and of course at room temperature (room temperature) And (placed in a refrigerator minus) peeling at. The self-adhesiveness of an adhesive layer does not fall even if it repeats adhesion | attachment.

In addition, the laminated | multilayer film of this invention peels the heat-sealing part of the laminated | multilayer film used for a package by selecting suitably the kind or composition ratio of a polymer used for an adhesive composition, the thermoplastic resin used for a laminate layer, and the thermoplastic resin used for a heat-sealing layer. When the heat sealing layer breaks, the pressure-sensitive adhesive composition of the intermediate layer breaks down, the peeling part becomes cloudy, and the resealing part remains cloudy even when it is resealed. Therefore, it is determined whether the package is opened or resealed. Can be determined by

Since the adhesive composition of this invention is excellent in self adhesiveness and self-adhesiveness does not fall even if it peels and adheres repeatedly, the packaging material excellent in resealability can be obtained by using it for the intermediate | middle layer of the film which consists of a thermoplastic resin.

The laminated | multilayer film of this invention heat-seals (heat-seaps) the film or container provided with the heat-sealing layers (heat-sealing layer) which consists of said thermoplastic resin (E), or these heat-sealing layers and the heat-sealing layer which can be heat-sealed. After that, when the heat sealing part is peeled off (opened), the heat sealing layer is broken, and the pressure-sensitive adhesive composition layer having excellent self-adhesiveness of the intermediate layer is exposed to the peeling surface, and preferably the pressure-sensitive adhesive composition layer is cohesive-broken and is applied to both peeling surfaces. Since it is exposed, it can be resealed by pressing the peeling surface again with a finger, etc., and it also has the advantage that there is little fall of resealing strength even if it is repeatedly opened and bonded.

This feature makes it suitable for packaging materials such as sheets, trays, cups and bottles made of propylene-based polymers, and packaging of snack confectionery such as whole cakes and potato chips, or jelly, milk, yogurt, pudding, It can be suitably used as a packaging material for food packaging such as tofu, lactic acid beverages, packaging for medicines, medical instruments, etc., blister packaging, packaging for other daily necessities and sundries.

Claims (16)

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). The ethylene-vinyl acetate copolymer (B) having a olefinic block copolymer elastomer (A) of 10 to 80% by weight and a vinyl acetate content of 25 to 80% by weight according to claim 1, and a tackifier. The agent (C) is 10 to 40 weight%, provided that (A) + (B) + (C) = 100 weight%], The adhesive composition characterized by the above-mentioned. 3. The olefin according to claim 1, wherein the olefinic block copolymer elastomer (A) has a styrene-diene block copolymer (A1) and / or at least one amorphous olefin polymer block and a crystalline olefin polymer block. -Amorphous olefin block copolymer (A2), The adhesive composition characterized by the above-mentioned. The pressure-sensitive adhesive composition according to claim 3, wherein the styrene-diene block copolymer (A1) is a hydrogenated substance. The hydrogenated product of the styrene-diene block copolymer (A1) according to claim 4, wherein the hydrogenated substance of the styrene-diene block copolymer (A1) is at least one of styrene-butadiene block copolymer, styrene-butadiene-styrene block copolymer and styrene-isoprene-styrene block copolymer. It is a hydrogenated substance of a copolymer, The adhesive composition characterized by the above-mentioned. 4. The olefin-amorphous olefin block copolymer (A2) according to claim 3, wherein the olefin-amorphous olefin block copolymer (A2) is either styrene-ethylenebutene-crystalline olefin block copolymer or crystalline olefin-ethylenebutene-crystalline olefin block copolymer. Pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition according to any one of claims 1 to 6, wherein the tackifier (C) is any one or more of rosin derivatives, terpene-based resins, petroleum resins, and hydrogenated petroleum resins. A laminated film formed by laminating a heat-sealing layer made of a thermoplastic resin (E) on one surface of a laminate layer made of a thermoplastic resin (D) through an intermediate layer made of the pressure-sensitive adhesive composition according to any one of claims 1 to 7. . The laminated film according to claim 8, wherein the thermoplastic resin (D) is a propylene polymer. The laminated film according to claim 8, wherein the thermoplastic resin (E) is a propylene-α-olefin random copolymer. The heat sealing according to any one of claims 8 to 10, wherein after the heat sealing of the heat sealing layer made of the thermoplastic resin (E) of the laminated film with another heat sealingable thermoplastic resin layer, the heat sealing part is peeled off. The breakdown layer is broken, and the intermediate | middle layer which consists of an adhesive composition is cohesive-broken, and the adhesive composition is exposed on both surfaces of a heat-sealing peeling part, The laminated | multilayer film characterized by the above-mentioned. It consists of the laminated | multilayer film of any one of Claims 8-11, The container lid | cover material characterized by the above-mentioned. The packaging body formed by heat-sealing the heat sealing layers of the laminated | multilayer film of any one of Claims 8-11. The package which consists of heat-sealing the heat-sealing layer of the laminated | multilayer film of any one of Claims 8-11, and another heat-sealable thermoplastic resin layer. The packaging body formed by heat-sealing a container upper surface with the container lid | cover material of Claim 12. The heat-sealing layer made of the thermoplastic resin (E) of the laminated film breaks when the package is opened, and at the same time, the intermediate layer made of the pressure-sensitive adhesive is cohesive-broken and the heat-sealing peeling is carried out. The packaging body which exposes an adhesive composition on both sides of a part.