JP2009291973A - Laminated film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated film having a high wetting tension of a pasted layer pasted onto a base material layer adhesive face, and excellent adhesion affinity, having a seal layer of low sliding friction coefficient, and an excellent anitiblocking property, and having strong adhesiveness between the respective layers, and capable of preventing interlayer separation. <P>SOLUTION: This laminate/film comprises three layers of the seal layer, an intermediate layer and the pasted layer, wherein the seal layer comprises a layer of an ethylene-unsaturated carboxylic acid copolymer ionomer composition blended with 0.4-2.0 wt.% of slip agent and 0.5-10.0 wt.% of antiblocking agent, per total amount of an ethylene-unsaturated carboxylic acid copolymer ionomer, the slip agent and the antiblocking agent, the intermediate layer comprises a layer of a composition of an ethylene-unsaturated carboxylic acid copolymer or an ionomer thereof (on the condition where a slip agent concentration in the ionomer composition of the intermediate layer is lower than a slip agent concentration in the ionomer composition of the seal layer) blended with the slip agent within a range of 0.01-0.5 wt.% , per total amount of the ethylene-unsaturated carboxylic acid copolymer or the ionomer thereof, and the slip agent, and the bonded layer comprises a layer of an ethylene-unsaturated carboxylic acid copolymer ionomer composition blended with 0.5-10.0 wt.% of antiblocking agent, per total amount of the ethylene-unsaturated carboxylic acid copolymer ionomer and the antiblocking agent, and not containing the slip agent. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a laminated film having a sealant function, that is, a laminated film. More specifically, the laminated film is composed of a seal layer, an intermediate layer, and a laminated layer, and the laminated layer is excellent in adhesiveness with a base film, and Even if the laminated film is rolled or overlapped, the slipperiness is not impaired and the anti-blocking property is excellent, and the interlayer adhesion is strong, so it can be laminated on the base film by dry lamination method or sandwich lamination method The present invention relates to a laminated film from which an excellent packaging heat seal film can be obtained.

In addition to heat sealability, packaging films for various articles such as foods are required to have various functions such as heat resistance, transparency, gas barrier properties, pinhole resistance, and printability according to their respective applications.
For this reason, a single film is relatively rarely used as a packaging film, and a laminated film in which a heat-sealing sealant film and a base film such as a biaxially stretched polyester film or a biaxially stretched polyamide film are laminated. Is often used.

In addition, with the spread of automatic filling and the like, the multilayer film has been further laminated.
For example, Patent Document 1 includes at least a surface base material layer, an intermediate layer, and a sealant layer, and the intermediate layer is formed of a resin composition having a specific mixing ratio of linear low-density polyethylene and high-pressure low-density polyethylene, and has interlayer adhesion strength. An invention of a packaging film that is strong and has automatic filling adaptability is disclosed.

  Furthermore, Patent Document 2 discloses a multilayered film comprising a base material layer, an intermediate layer, and an inner surface layer, wherein the inner surface layer is further formed of a bonding layer, a core layer, and a seal layer. In addition, films suitable for filling liquid products having excellent sealing properties and low temperature sealing properties and barrier properties have been proposed.

  Recently, the multilayer laminated film for packaging as described above is, for example, a sealant film in a laminated form composed of a sealant layer (inner surface layer), a buffer or middle core layer (intermediate layer), a bonding layer (outer surface layer), etc. It is often manufactured by, for example, laminating and adhering this to a substrate film surface coated with an adhesive by a dry lamination method or a sandwich lamination method, and laminating multiple layers. Invention of a polypropylene multilayer sealant film for retort that has a surface with a specific roughness on the surface and a laminar surface with a specific roughness, does not contain bubbles at the bonding interface with the heat-resistant substrate film, and has an excellent laminate appearance Is disclosed.

The multilayer laminated film for packaging as described above has an adhesive affinity of the bonding layer to the adhesive-coated surface of the base material layer while satisfying requirements such as good laminate appearance and excellent heat resistance. Is good, i.e. the wetting tension of the laminating layer is large, even if the film itself is rolled up, etc. even if the film itself is stacked, the slipperiness is not impaired at the time of film feeding, i.e., the sliding friction coefficient is excellent. It is particularly important to satisfy the basic requirements such as being small, and further, adhesion between layers such as the sealant layer, the buffer or core layer, and the bonding layer is strong and there is no delamination.
However, since the application is packaging, it is also necessary to be able to produce cheaply and efficiently.
However, a multilayer sealant film that satisfies all the above requirements has not yet appeared as far as the present inventors can know.

Japanese Patent Laid-Open No. 11-10809 JP 2000-117904 A JP 2005-178217 A

  As a result of intensive studies to develop a multilayer film satisfying the above requirements, the present inventors have used a specific ionomer resin as a resin component constituting the sealant layer, the buffer intermediate layer, and the bonding layer of the multilayer film. It was found that an antiblocking agent and a slipping agent to be blended with each layer having a specific combination composition meet all the above requirements, and the present invention was completed based on this finding.

Therefore, the object of the present invention is that the bonding layer to be bonded to the base material layer adhesive surface has a large wetting tension, a good adhesion affinity, a small sliding friction coefficient of the sealing layer and an excellent antiblocking property, and each layer. Is to provide a laminated film having strong adhesion and no delamination.
Another object of the present invention is to provide a multi-layer laminated film for packaging that can be easily laminated and bonded to the base film adhesive application surface by a dry lamination method or a sandwich lamination method. It is in providing the laminated film which can produce material.

  According to the present invention, there is a laminated film comprising three layers of a seal layer, an intermediate layer, and a bonding layer, wherein the seal layer is a total amount of an ethylene / unsaturated carboxylic acid copolymer ionomer, a slip agent, and an antiblocking agent. In contrast, it comprises a layer of an ethylene / unsaturated carboxylic acid copolymer ionomer composition containing 0.4 to 2.0% by weight of a slip agent and 0.5 to 10.0% by weight of an antiblocking agent. The intermediate layer contains an ethylene / unsaturated carboxylic acid copolymer or a slip agent in the range of 0.01 to 0.5% by weight with respect to the total amount of the ionomer and the slip agent. The layer of the acid copolymer or its ionomer composition (however, the slip agent concentration in the ionomer composition of the intermediate layer is the slip agent in the ionomer composition of the sealing layer) The anti-blocking agent is 0.5 to 10.0% by weight based on the total amount of the ethylene / unsaturated carboxylic acid copolymer ionomer and the anti-blocking agent. And a layer of an ethylene / unsaturated carboxylic acid copolymer ionomer composition substantially free from slip agent.

According to the invention, there is also provided a laminated film in which the laminated film is a sealant film.
In the laminated film of the present invention, it is preferable that the surface of the bonding layer that is to be in contact with the substrate is corona-treated.

  In the laminated film of the present invention, a polyolefin resin is further added to the composition constituting the sealing layer, the intermediate layer or the bonding layer in an amount of 20 parts by weight based on 100 parts by weight of the ethylene / unsaturated carboxylic acid copolymer or ionomer. You may mix | blend in the ratio below a weight part.

  The laminated film of the present invention is suitable for dry lamination or sandwich lamination for producing a multilayer film laminated with a base material layer.

The laminated film according to the present invention uses a specific ionomer (in the case of the intermediate layer, an ethylene / unsaturated carboxylic acid copolymer or its ionomer) as a resin component for the sealant layer, the intermediate layer, and the bonding layer, and slips. Due to the specific composition in which the agent is blended in a specific combination for each layer, the wetting tension of the bonding layer with respect to the base material layer adhesive surface is as great as 52 mN / m or more, the adhesive affinity is good, and the sliding friction coefficient of the seal layer is 0. Less than 4 and excellent in anti-blocking properties, and has excellent properties as a laminated film such as strong adhesion between layers and no delamination, especially the laminated film according to the present invention has excellent properties as a laminated sealant film Therefore, it is suitably used as a sealant film.
Moreover, it can be easily laminated and bonded to the base film adhesive application surface by a dry lamination method or a sandwich lamination method to form a multilayer laminated film for packaging, and an inexpensive and efficient packaging material production is possible.
Furthermore, the obtained multilayer laminated film for packaging has a good laminate appearance and excellent heat resistance.
Therefore, it can be laminated on a base film to make a multilayer film, and then a molded product for packaging can be easily produced. For example, industrial parts such as foods, pharmaceuticals, cosmetics, stationery, daily goods, precision machine parts and electronic products. It is suitably used for manufacturing packaging materials.

Embodiments according to the present invention will be specifically described below.
As described above, the present invention is an invention of a three-layer laminated film in which a seal layer, an intermediate layer, and a bonding layer are laminated in this order, and the seal layer is antiblocking to an ionomer of an ethylene / unsaturated carboxylic acid copolymer. It is composed of a composition in which an agent and a slip agent are blended at a specific concentration, and the intermediate layer is blended with an ethylene / unsaturated carboxylic acid copolymer or its ionomer at a lower concentration than the seal layer and in a specific concentration range. It is a structural feature that the composition is composed of a composition in which an antiblocking agent is blended in a specific range concentration without blending a slip agent with an ionomer of an ethylene / unsaturated carboxylic acid copolymer. .

The ethylene / unsaturated carboxylic acid copolymer that is the base resin of the ethylene / unsaturated carboxylic acid copolymer ionomer used in each of the seal, intermediate, and laminated layers in the laminated film of the present invention includes ethylene and acrylic acid. And copolymers with methacrylic acid, ethacrylic acid, crotonic acid, fumaric acid, maleic acid, monomethyl maleate, maleic anhydride, itaconic acid, itaconic anhydride and the like.
Of these, ethylene / acrylic acid copolymers and ethylene / methacrylic acid copolymers are preferred.

  The ethylene / unsaturated carboxylic acid copolymer used in the present invention further includes other polar monomers such as unsaturated carboxylic acid esters such as acrylic acid esters and methacrylic acid esters, and vinyl acetate. It may be a copolymer of vinyl ester or the like, and suitable examples of such multi-component copolymers include ethylene / methacrylic acid / alkyl acrylate copolymers, ethylene / acrylic acid / methacrylic acid alkyl ester copolymers, etc. And an ethylene / unsaturated carboxylic acid / unsaturated carboxylic acid alkyl ester multi-component copolymer.

Examples of the alkyl group of the alkyl ester group include those having 1 to 12 carbon atoms, and more specifically, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, secondary butyl, 2-ethylhexyl, An alkyl group such as isooctyl can be exemplified.
Of these, methyl, ethyl and isobutyl esters of acrylic acid or methacrylic acid are preferred.

In the case of such a multi-component copolymer, the content of the other polar monomer is preferably 20% by weight or less based on the total copolymer component.
Further, two or more of the binary or multi-component ethylene / unsaturated carboxylic acid copolymers may be mixed.

  In such binary or multi-component ethylene / unsaturated carboxylic acid copolymer, the ethylene content is preferably in the range of 60 to 98% by weight and the unsaturated carboxylic acid content in the range of 2 to 20% by weight, The melt flow rate (MFR) (based on JIS K7210-1999) is preferably in the range of 0.01 to 500 g / 10 min (2160 g load, 190 ° C.).

As the ionomer of the ethylene / unsaturated carboxylic acid copolymer used as the resin component of the seal layer, intermediate layer, and bonding layer in the present invention, a binary or ternary or higher copolymer containing the unsaturated carboxylic acid is used. Examples thereof include salts neutralized with metal ions such as lithium, sodium, potassium, calcium, magnesium and zinc.
Two or more kinds of the metal ions may be mixed.
The degree of neutralization with these metal ions is preferably more than 0 to 85%, particularly preferably 0.1 to 85%.
The melt flow rate (MFR) (based on JIS K7210-1999) as an ionomer is preferably in the range of 0.01 to 100 g / 10 min (2160 g load, 190 ° C.).

As an antiblocking agent mix | blended with the sealing layer of this invention, a bonding layer, or an intermediate | middle layer, a talc, a silica, a calcium carbonate, a synthetic zeolite, starch, etc. can be illustrated.
Of these, synthetic zeolite, silica and the like are preferable.
Moreover, the antiblocking agent may mix 2 or more types, or may differ for every layer.

Next, the slip agent blended in the seal layer and the intermediate layer in the present invention includes hydrocarbon waxes such as liquid paraffin, paraffin wax, microwax and polyethylene wax, stearic acid, 1,2-hydroxystearic acid, Fatty acid type or higher alcohol type waxes such as stearyl alcohol, stearic acid amide, oleic acid amide, erucic acid amide, behenic acid amide, methylene bis stearic acid amide, ethylene bis stearic acid amide, ethylene bis oleic acid amide, N-oleyl Examples include amide waxes such as palmitoamide, metal soaps such as lead stearate, zinc stearate, calcium stearate and magnesium stearate, as well as silicone and acrylic polymer lubricants.
Of these, amide waxes such as behenic acid amide, erucic acid amide and N-oleyl palmitoamide are preferred.
Two or more slip agents may be mixed and used.

The sealing layer in the laminated film of the present invention is composed of a resin composition obtained by blending the anti-blocking agent and the slip agent with the ethylene / unsaturated carboxylic acid ionomer.
When the anti-blocking agent and the slip agent are combined in the seal layer, the seal layer of the present invention exhibits excellent anti-blocking performance without impairing the heat sealability.
A resin composition in which neither an antiblocking agent nor a slipping agent or any of them is blended is not preferable because the resulting laminated film has insufficient sliding friction properties and lacks antiblocking properties.
The resin composition constituting the sealing layer is 0.4 to 2.0% by weight, preferably 0. 0% by weight to the total amount of ethylene / unsaturated carboxylic acid copolymer ionomer, slip agent and antiblocking agent. 4 to 1.0% by weight, anti-blocking agent 0.5 to 10.0% by weight, preferably 1.0 to 5.0% by weight, and if necessary, prescribed amounts of various additives such as antioxidants are blended An ethylene / unsaturated carboxylic acid copolymer ionomer composition.
If the amount of the anti-blocking agent or slip agent is too small, the anti-blocking property is not sufficient, and if the amount is too large, the heat sealing property is affected.

  In addition, the resin component of the sealing layer may be a small amount of other resin components in addition to the ethylene / unsaturated carboxylic acid copolymer ionomer, for example, less than 20 parts by weight of ethylene, polypropylene, polybutene, polybutadiene, etc. with respect to 100 parts by weight of the ionomer. The polyolefin resin may be blended, and as such a polyolefin resin, polypropylene is preferable.

Next, in the laminated film intermediate layer of the present invention, the ethylene / unsaturated carboxylic acid copolymer or its ionomer has a slip agent concentration in the resin composition of the intermediate layer of the slip agent in the ionomer composition of the seal layer. The content of the slip agent relative to the total amount of the ethylene / unsaturated carboxylic acid copolymer or its ionomer and slip agent in the resin composition formulated to be lower than the content concentration, that is, the resin composition of the intermediate layer The resin composition is less than the content of the slip agent relative to the total amount of the ethylene / unsaturated carboxylic acid copolymer ionomer and the slip agent in the ionomer composition of the seal layer.
The ethylene / unsaturated carboxylic acid copolymer used as the resin component of the intermediate layer is the ethylene / unsaturated carboxylic acid copolymer described as the base resin of the ethylene / unsaturated carboxylic acid copolymer ionomer used in the seal, intermediate and laminated layers. An acid copolymer can be used.
When the intermediate layer is composed of a resin other than the ethylene / unsaturated carboxylic acid copolymer defined in the present invention or its ionomer, the interlayer adhesion to the seal layer and the bonding layer is insufficient, and various physical properties between both layers The differential buffering action is not sufficient.

In an intermediate layer composed of a resin composition in which a slip agent is added to an ethylene / unsaturated carboxylic acid copolymer or ionomer at a concentration higher than the content of the slip agent in the ionomer composition of the seal layer, the slip agent gradually The slip agent transferred to the seal layer or the bonding layer diffuses and the slip agent transferred to the seal layer changes the concentration of the slip agent in the layer, thereby causing a disadvantage of changing the concentration balance with the anti-blocking agent.
Moreover, the slip agent transferred to the bonding layer causes a decrease in the wetting tension of the base material adhesion surface of the layer.
On the other hand, in the resin composition in which no slip agent is added to the ionomer, the slip agent diffusion transfer from the seal layer cannot be sufficiently prevented, and the slip agent concentration of the seal layer gradually decreases, and the anti-blocking property of the layer is reduced. There is a danger of incurring a decrease in time.

The resin composition constituting the intermediate layer is 0.01 to 0.5% by weight, preferably 0.1 to 0%, based on the total amount of the ethylene / unsaturated carboxylic acid copolymer or its ionomer and slip agent. 3% by weight of a slip agent as an essential component and, if necessary, a predetermined amount of various additives such as an antioxidant.
In addition, an anti-blocking agent may be blended in the intermediate layer in the same manner as the two layers from the viewpoint of enhancing the physical property buffering property between the seal layer and the bonding layer. In this case, the blending amount is 0-10. 0.0% by weight, more preferably 0 to 5.0% by weight.
Further, the resin component of the intermediate layer may be used in addition to the ethylene / unsaturated carboxylic acid copolymer or its ionomer in a smaller amount of other resin components, for example, ethylene / unsaturated carboxylic acid copolymer or its ionomer. Also, it may be blended with less than 20 parts by weight of a polyolefin resin such as ethylene, polypropylene, polybutene, or polybutadiene, and polypropylene is preferred as such a polyolefin resin component.

In this invention, a bonding layer is comprised from the resin composition which mix | blended the antiblocking agent with the said ionomer.
In a resin composition that does not contain an anti-blocking agent, even if the sealing layer is made of a composition containing an anti-blocking agent or slip agent, the resulting laminated film does not necessarily have sufficient anti-blocking properties. Absent.
In addition to the anti-blocking agent, or in addition to the anti-blocking agent, a compound containing a slip agent is not preferable because the surface wetting tension of the layer is lowered and the adhesion to the substrate is inferior.

It is preferable that the resin composition which comprises a bonding layer does not contain a slip agent for the said reason. On the other hand, the blending amount of the antiblocking agent is 0.5 to 10% by weight, preferably 1.0%, based on the total amount of the ethylene / unsaturated carboxylic acid copolymer ionomer and the antiblocking agent in the composition constituting the layer. ~ 5% by weight.
If the blending amount of the antiblocking agent is too small, the antiblocking property of the resulting laminated film is not necessarily sufficient, and if the blending amount is too large, the sealing property tends to be lowered.
In addition, the resin component of the laminating layer is the ethylene / unsaturated carboxylic acid copolymer ionomer in addition to a small amount of other resin components, for example, less than 20 parts by weight of ethylene, polypropylene, polybutene, polybutadiene with respect to 100 parts by weight of the ionomer. Such a polyolefin resin may be blended, and such a polyolefin resin is preferably polypropylene.

  When preparing the resin composition constituting each of the above layers, blend an anti-blocking agent or slip agent directly into the ionomer and dry blend with a tumbler or the like until sufficiently uniform, or melt and knead with an extruder, Banbury mixer, etc. Although it can be made into a composition, for example, the same resin as an ionomer base resin such as ethylene / (meth) acrylic acid copolymer is used as a dilution resin, and the anti-blocking agent and / or slip agent is blended in a small amount in advance. It is more convenient to use a master batch that is uniformly dispersed.

The thickness of each layer is not particularly limited and may be appropriately set to each layer thickness usually employed in the laminated sealant film, but the seal layer is about 5 to 50 μm, the intermediate layer is about 5 to 50 μm, As for a lamination layer, about 5-50 micrometers is common.
The thickness of the entire laminated film is usually preferably about 15 to 150 μm.

  As a method for producing the laminated film of the present invention, a method usually used for producing this kind of laminated film, for example, a resin composition of each layer is used by extrusion or coextrusion film forming method such as T-die casting and inflation. For example, it can laminate | stack at 130-230 degreeC and can be set as a laminated | multilayer film.

The laminated film having a three-layer structure of the sealing layer / intermediate layer / bonding layer of the present invention is more preferably subjected to corona treatment on the surface of the bonding layer (the surface to be bonded to the substrate film). Corona treatment is particularly effective when continuous lamination is performed by a lamination method.
Such a laminated film of the present invention has a wetting tension of 52 mN / m or more at the base film adhesion side of the bonding layer, a sliding friction coefficient of 0.4 or less at the surface of the seal layer, and a supporting base material. No delamination is observed in the peel test after laminating the films and heat-sealing the laminated multilayer laminated film.

Examples of the support substrate to be adhesively laminated to the laminated film of the present invention include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polyamides such as nylon; polyvinyl chloride; Polycarbonate; Polyimide; Polyetheretherketone; Polyetherketone elastomer; Polyurethane; Polyethersulfone; Polyphenylenesulfide; Polyamideimide and the like.
The film which comprises these layers may be extended | stretched as needed. The stretching may be either uniaxial stretching or biaxial stretching.

Moreover, the vapor deposition or surface coat film etc. which were manufactured by vapor-depositing a metal, a metal oxide, etc. to the said thermoplastic resin film, or coating resin can be used.
Specific examples include a silica-deposited polyethylene terephthalate film and an alumina-deposited polyethylene terephthalate film.
Further, in addition to the thermoplastic resin film, various papers and metal foils such as aluminum foil may be used as the supporting base material.
Also, a polyolefin intermediate layer such as polyethylene or polypropylene may be sandwiched between the support film and the laminated film of the present invention.

In order to laminate the laminated film according to the present invention on the supporting base film, the surface of the base film is generally coated with an adhesive by coating or the like, and laminated by a dry lamination method or a sandwich lamination method. is there.
Specifically, a method of applying an epoxy-based, polyurethane-based, acrylic-based adhesive or the like to the corona-treated surface of the above-mentioned supporting substrate film by coating, etc., and dry-laminating the above-mentioned thermoplastic resin film with a dry laminator, or a supporting substrate After applying an anchor coating agent to the substrate, an extrusion laminate of an adhesive resin such as an ethylene / acrylic acid copolymer or an ethylene / methacrylic acid copolymer is applied between the supporting base anchor coating agent application surface and the thermoplastic resin film. A method of forming a laminate by lamination can be exemplified.

As a layer configuration example of a laminate obtained by laminating and laminating the laminate film of the present invention, a support base material layer such as polyester (PET) and nylon (NY) / laminate (sealant) film layer of the present invention,
Support base layer / intermediate layer such as polyethylene (PE) layer / laminated (sealant) film layer of the present invention,
Support base layer / polyethylene layer (intermediate layer) / Al foil or Al deposited film layer (intermediate layer) / laminated (sealant) film layer of the present invention,
Support base material layer / alumina deposited film layer (intermediate layer) / laminated (sealant) film layer of the present invention,
Surface coat support substrate layer / laminated (sealant) film layer of the present invention,
Laminated (sealant) film layer / PE (intermediate layer) / support substrate layer / PE (intermediate layer) / laminated (sealant) film layer of the present invention,
Etc.

  Such a film / sheet-like laminate of the present invention is suitable for the production of molded articles such as packaging bags, containers, and container lids for foods, pharmaceuticals, cosmetics, and industrial parts.

[Example 1]
Zinc ionomer of ethylene / methacrylic acid / isobutyl acrylate copolymer [methacrylic acid content 9.7% by weight, isobutyl acrylate content 8.3% by weight] [degree of neutralization 32.2%, MFR 4.0 g / 10 min ] (IO) 85 parts by weight, master batch containing anti-blocking agent and slip agent [anti-blocking agent (synthetic zeolite) 20 parts by weight, slip agent A (N-oleyl palmitoamide) 4 parts by weight, slip agent B (Behenamide;) 2 parts by weight, master batch comprising 74 parts by weight of ethylene / methacrylic acid copolymer; MFR = 17.0 g / 10 minutes] (MB-1) 15 parts by weight (kneaded) (dry blend). Thus, a composition for a sealing layer was prepared.

  Next, a master batch of another composition in which 80 parts by weight of the above-mentioned ionomer (IO), an antiblocking agent and a slip agent were blended [20 parts by weight of synthetic zeolite, 1 part by weight of N-oleyl palmitoamide, ethylene / methacrylic acid copolymer 79 A master batch composed of parts by weight; MFR = 10.0 g / 10 min] (MB-2) 20 parts by weight was kneaded to prepare a composition for an intermediate layer.

  Furthermore, another master batch in which 85 parts by weight of the above-mentioned ionomer (IO) and only an antiblocking agent were blended [a master batch comprising 20 parts by weight of synthetic zeolite and 80 parts by weight of ethylene / methacrylic acid copolymer; MFR = 10.0 g / 10 Minute] (MB-3) 15 parts by weight were kneaded to prepare a composition for a bonding layer.

Then, these three kinds of compositions were formed into a film at 170 ° C. using a multi-layer inflation molding machine to produce two kinds of three-layer laminated films having different thicknesses [(Example film 1: thickness 30 μm: seal layer (10) / intermediate layer (10) / bonding layer (10): Example film 2: thickness 51 μm: sealing layer (17) / intermediate layer (17) / bonding layer (17)].
And the wetting tension (measuring method JIS K6768 conformity) and the sliding friction coefficient (measuring method JIS K7125 conformity) of the sealing layer surface were measured, respectively.
The results are shown in Table 1.

Next, after the corona treatment is performed on the surface of the laminated layer of the laminated film, the corona-treated surface of the laminated layer of the laminated film is brought into contact with the adhesive-coated surface of the biaxially stretched PET base film using an extrusion lamination molding machine. The laminated film was dry-laminated to a base film to obtain a multilayer laminated film having a layer constitution of base layer / adhesive layer / bonding layer / intermediate layer / seal layer.
Then, after the seal layer surfaces of the obtained multilayer laminated film are overlapped and heat-sealed (180 ° C., actual pressure 0.2 MPa, time 0.5 seconds), they are peeled off by hand, and a laminated layer / intermediate layer and intermediate layer / The presence or absence of delamination of the seal layer was visually evaluated (cutting occurs at the seal portion when the interlayer adhesion between the bonding layer / intermediate layer and the intermediate layer / sealing layer is sufficiently strong, and delamination occurs when it is weak).
The results are also shown in Table 1.

[Comparative Example 1]
Instead of the composition for the laminating layer of Example 1, a metallocene-catalyzed polymerized linear low density polyethylene [MFR 1.9 g / min; made by Mitsui Chemicals; SP2520] 95 parts by weight of an antiblocking agent-containing masterbatch for polyethylene [Containing 10% by weight of anti-blocking agent; manufactured by Prime Polymer Co., Ltd.] (MB-4) A laminated sealant film was prepared in the same manner as in Example 1 except that a composition containing 5 parts by weight was used. The wetting tension and the sliding friction coefficient of the seal layer surface were measured, respectively, and the presence or absence of delamination was evaluated in the same manner as in Example 1.
The results are also shown in Table 1.

[Comparative Example 2]
A composition containing 20 parts by weight of (MB-2) instead of the master batch (MB-1) in the composition for the sealing layer of Example 1 (IO: 80 parts by weight: slip agent content: 0.2% by weight) A laminated sealant film was prepared in the same manner as in Example 1 except that was used as the composition for the sealing layer, and the wetting tension on the surface of the bonding layer and the sliding friction coefficient on the surface of the sealing layer were measured. In the same manner as above, the presence or absence of delamination was evaluated.
The results are also shown in Table 1.

Claims (5)

  A laminated film comprising three layers of a sealing layer, an intermediate layer, and a bonding layer, wherein the sealing layer is 0 with respect to the total amount of the ethylene / unsaturated carboxylic acid copolymer ionomer, slip agent and antiblocking agent. A layer of an ethylene / unsaturated carboxylic acid copolymer ionomer composition containing 4 to 2.0% by weight of a slip agent and 0.5 to 10.0% by weight of an antiblocking agent, , An ethylene / unsaturated carboxylic acid copolymer or an ethylene / unsaturated carboxylic acid copolymer blended with a slip agent in the range of 0.01 to 0.5% by weight based on the total amount of the ionomer and the slip agent The layer of the ionomer composition (however, the slip agent concentration in the intermediate layer composition is lower than the slip agent content in the ionomer composition of the sealing layer) The laminating layer contains 0.5 to 10.0% by weight of an antiblocking agent and contains a slipping agent with respect to the total amount of the ethylene / unsaturated carboxylic acid copolymer ionomer and the antiblocking agent. A laminated film comprising a layer of an ethylene / unsaturated carboxylic acid copolymer ionomer composition.   The laminated film according to claim 1, wherein the laminated film is a sealant film.   The film of Claim 1 or 2 by which the surface which should contact the base material of the said bonding layer is corona-treated.   A polyolefin resin is further blended in the composition constituting the sealing layer, intermediate layer or bonding layer in a proportion of 20 parts by weight or less with respect to 100 parts by weight of the ethylene / unsaturated carboxylic acid copolymer or ionomer. The film in any one of 1-3.   The film according to any one of claims 1 to 4, which is used for dry lamination or sandwich lamination.