JP2003145694A - Seal film and laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal film having a seal layer compounded with a lubricant and well keeping interlaminar strength, and a laminate. SOLUTION: The seal film is constituted by providing a seal layer comprising a resin composition, which contains 100 pts.wt. of at least one kind of an ethylene/unsaturated carboxylic acid ester copolymer, 20-150 pts.wt. of a resin selected from the group consisting of low density polyethylene and an ethylene/α-olefin copolymer and 0.2-1.5 pts.wt. of at least one kind of higher fatty acid amide, and a support layer comprising low density polyethylene or the like with a density of 0.923 g/cm<3> or more and one surface of the seal film is constituted of the seal layer. The seal film is laminated to a substrate material to obtain the laminate.

Description

Detailed Description of the Invention

The present invention relates to a seal film and a laminate having the seal film as a main constituent element.

[0002]

2. Description of the Related Art For example, a lid member used to seal an opening of a container body such as a plastic bowl or tray has a sealing property required for protection of contents and prevention of leakage of contents. At the same time, it is required to have easy peeling property such that it can be easily peeled off from the container body when opened. Such a peelable open packaging material such as a lid is generally provided with a layer of a seal film for adhesion to an adherend (for example, a container body). JP-A-5-21283
No. 5, gazette has good adhesion with a sealing partner material and can be easily opened without causing a stringing phenomenon.
A film developed as an easily peelable film having a good-looking peeled surface is disclosed. Specifically, from ethylene / methacrylic acid copolymer, ethylene / acrylic acid copolymer, ionomer, ethylene / methyl methacrylate copolymer, ethylene / ethyl acrylate copolymer, ethylene / methyl acrylate copolymer A kind of resin selected from the group consisting of polyethylene, polypropylene, ethylene /
Sealing layer containing a blend polymer of at least one resin selected from the group consisting of propylene copolymers and ethylene
/ Methacrylic acid copolymer, ethylene / acrylic acid copolymer, ionomer, ethylene / methyl methacrylate copolymer, ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate copolymer and their maleic acid graft copolymers It is an easily peelable film in which a layer containing one or more polymers selected from the group consisting of coalescence is laminated by coextrusion. In such a conventional easily peelable film, when a copolymer containing a large amount of comonomer is used for the seal layer, the slipperiness of the film surface is generally poor, and a blocking problem may occur.

As a means for solving the above blocking problem, a lubricant such as higher fatty acid amide is generally added to the seal layer. The seal layer may be formed, for example, in the above-mentioned Japanese Patent Laid-Open No.
Like the film described in JP-A-212835, it is laminated with a support layer to form an easily peelable film, and the easily peelable film is usually laminated with a base film via an adhesive layer to form a lid for a container. Used as material. However, the lubricant in the seal layer migrates to the interface between the adhesive layer and the easily peelable film, or even to the interface between the adhesive layer and the base film, and as a result, the laminate strength at these interfaces is increased. descend.

[0004]

In such a situation,
An object of the present invention is a seal film having a seal layer in which a lubricant is blended, the interlayer laminate strength is favorably maintained in a state of being laminated with a base material, and a seal film suitable for a peel opening packaging material, and An object of the present invention is to provide a laminate having a layer of a seal film and a layer of a base material, maintaining good interlayer lamination strength and suitable for a peel-open packaging material.

[0005]

Means for Solving the Problems As a result of intensive studies aimed at achieving the above object, the present inventors have found that a blending resin having a specific composition and a higher fatty acid amide as a lubricant are blended with a specific polyethylene layer. A sealing film formed by laminating a supporting layer consisting of the above is suitable for the above-mentioned intended purpose, and the intended laminated body is obtained by laminating this with a base material. The present invention has been completed by finding that it is suitable as a seal film and a laminate.

That is, the present invention provides a seal film having the following constitution (1) and a laminate having the following constitution (2). (1) 100 parts by weight of at least one ethylene /
20 to 150 parts by weight of a resin selected from the group consisting of unsaturated carboxylic acid ester copolymers, low density polyethylene and ethylene / α-olefin copolymers, and 0.2 to
A seal layer made of a resin composition containing 1.5 parts by weight of at least one fatty acid amide, and a component selected from the group consisting of low density polyethylene, high density polyethylene and ethylene / α-olefin copolymer. A sealing film having a supporting layer made of a resin material having a density of 0.923 g / cm ³ or more and having one surface constituted by the sealing layer. (2) A laminate having at least one layer made of the seal film according to the above item (1) and a layer of a base material, at least one surface of which is constituted by the seal layer of the seal film. . The seal film and the laminate of the present invention exhibit a well-balanced adhesiveness and releasability with respect to an adherend made of polystyrene resin. However, the seal film and the laminate of the present invention, the material of the adherend is not limited to polystyrene-based resin, as long as the level of adhesiveness and releasability according to the specific application can be obtained, polystyrene It can also be applied to a seal for an adherend made of a material other than a system resin. A preferred embodiment of the seal film and the laminate of the present invention is a seal film for peeling and opening packaging and a laminate for peeling and opening packaging. An example of the peel-open packaging material is a container having an opening, in which at least the surface of the opening peripheral portion (so-called flange) that defines the opening is made of plastic (preferably polystyrene resin). A lid member that seals the opening by being attached to the flange and is peeled off from the flange when the container is opened can be used.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The seal film of the present invention is 10
0 parts by weight of at least one ethylene / unsaturated carboxylic acid ester copolymer, 20 to 150 parts by weight of a resin selected from the group consisting of low-density polyethylene and ethylene / α-olefin copolymer, 0.2 To 1.5 parts by weight of a resin composition containing at least one higher fatty acid amide, and a group consisting of low density polyethylene, high density polyethylene and ethylene / α-olefin copolymer. The density of the components is 0.923
It has a supporting layer made of a resin material of g / cm ³ or more, one surface of which is constituted by the sealing layer, and the sealing layer surface exhibits good slipperiness and a lubricant in the sealing layer. The migration of higher fatty acid amide to the support layer side is effectively suppressed.

The seal film having the above structure exhibits at least a well-balanced adhesive property and easy peeling property to an adherend made of a polystyrene resin, and also has a well-balanced adhesive property to a propylene resin. And easy peelability.

The resin composition constituting the seal layer contains at least one ethylene / unsaturated carboxylic acid ester copolymer. Examples of the unsaturated carboxylic acid ester include acrylic acid ester, methacrylic acid ester, and the like, and specifically, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, etc. Is mentioned. Particularly, methyl acrylate and methyl methacrylate are preferable in terms of easy peeling property. Further, the amount of unsaturated carboxylic acid ester unit in the ethylene / unsaturated carboxylic acid ester copolymer is preferably 25 to 50% by weight, from the viewpoint of easy peelability and appearance of the peeled portion after peeling, 25 ~ 4
5% by weight is more preferred.

The resin composition constituting the seal layer is 20 to 150 parts by weight selected from the group consisting of low density polyethylene and ethylene / α-olefin copolymer per 100 parts by weight of ethylene / unsaturated carboxylic acid ester copolymer. Part of resin is included. Low density polyethylene is generally LDP
Also referred to as E, the ethylene / α-olefin copolymer is generally a linear low-density polyethylene,
Alternatively, it is called LLDPE. ethylene/
As the α-olefin in the α-olefin copolymer,
Butene-1, hexene-1, octene-1, decene-
1, α-olefin having 3 to 12 carbon atoms such as dodecene-1, and the content thereof is usually 20% by weight or less. Further, the melt flow rate of the above low-density polyethylene and ethylene / α-olefin copolymer measured at 190 ° C. under a load of 2.16 kg, measured according to JIS K7210, is 15 g / 10 minutes or less, which is easy peelability. From the same viewpoint, the density measured in accordance with JIS K7112 is preferably less than 0.925 g / cm ³ .

The resin composition constituting the seal layer contains at least one higher fatty acid amide. The higher fatty acid amide is a so-called lubricant and has an effect of improving the slipperiness of the surface of the seal layer. As the higher fatty acid amide in the present invention, a higher fatty acid amide having 10 to 40 carbon atoms is preferably used. The content of the higher fatty acid amide in the resin composition constituting the seal layer is 10% by weight of the ethylene / unsaturated carboxylic acid ester.
It is 0.2 to 1.5 parts by weight, preferably 0.3 to 1.0 part by weight, per 0 parts by weight. Specific examples of the higher fatty acid amide include stearic acid amide, palmitic acid amide, oleic acid amide, lauric acid amide, erucic acid amide, lauric acid amide, behenic acid amide, and ethylenebisoleic acid amide. In order to achieve particularly excellent slipperiness, erucic acid amide, behenic acid amide, and ethylenebisoleic acid amide are preferable as the higher fatty acid ester.

The resin composition constituting the sealing layer is a thermoplastic resin other than low density polyethylene, ethylene / α-olefin copolymer, ethylene / unsaturated carboxylic acid ester copolymer, as long as the effect of the present invention is not impaired. Resins such as ethylene / vinyl acetate copolymers, ethylene / unsaturated carboxylic acid copolymers, metal salts of ethylene / unsaturated carboxylic acids,
It may contain a thermoplastic resin such as a polyolefin resin such as polypropylene or an ethylene / propylene copolymer.

The resin composition constituting the seal layer is a compatibilizer, an antistatic agent, an antioxidant, a heat stabilizer, an ultraviolet absorber, a pigment, a dye, an antibacterial agent, as long as the effect of the present invention is not impaired. Antifogging agents, antiblocking agents, tackifiers, plasticizers (mineral oil, wax, etc.) may be contained.

Particularly, the anti-blocking agent is effective in improving the anti-blocking property and the slip property when used in combination with a higher fatty acid amide (lubricant). The anti-blocking agent is generally spherical fine particles such as organic beads and inorganic beads. Specifically, the organic beads include acrylic resin beads, styrene resin beads, ethylene resin beads, and the like, and the inorganic beads include aluminosilicate beads, diatomaceous earth beads, and the like. The anti-blocking agent may be one kind or a mixture of two or more kinds. Also,
From the viewpoint of the anti-blocking property imparting effect, the average particle size is preferably 2 to 15 μm. When the anti-blocking agent is added, the addition amount thereof is preferably 0.5 to 5 parts by weight, more preferably 0.5 to 3 parts by weight, based on 100 parts by weight of the ethylene / unsaturated carboxylic acid ester copolymer.

The tackifier which can be added to the resin composition constituting the seal layer is selected from alicyclic hydrocarbon resins, terpene resins, rosins and aliphatic hydrocarbon resins and is determined by the GPC method. Number average molecular weight (Mn) is 150
It is preferably at least one kind which is 0 or less. M
When a tackifier having n of 1500 or less is used, the sealing property of the seal film of the present invention, particularly the low temperature sealing property and the liquid bite sealing property, can be further improved. The liquid bite sealability is the peel strength when sealing is performed in a state where liquid is present in the seal portion. Mn of the tackifier is a polystyrene-equivalent molecular weight determined by the GPC method, and can be easily determined by a commercially available GPC measuring device.

Specific examples of the aliphatic hydrocarbons include polymers having 4 to 5 carbon atoms as the main component, such as olefins and dienes. As the alicyclic hydrocarbon resin, a resin obtained by polymerizing a C4 petroleum fraction or a C5 petroleum fraction after cyclization and dimerization, a resin obtained by polymerizing a cyclic diene compound such as cyclopentadiene, or a hydrogenated product thereof , Further aromatic hydrocarbon resins and aliphatic hydrocarbons
Examples thereof include a resin obtained by hydrogenating an aromatic hydrocarbon copolymer resin in the nucleus. Examples of the terpene-based resin include polymers such as α-pinene, β-pinene and dipentene, terpene /
Examples thereof include phenol resins and hydrogenated terpene resins. Examples of rosins include rosin, rosin ester, hydrogenated rosin, hydrogenated rosin ester, and the like, or polymers of the above rosins. When adding a tackifier, the addition amount is
The amount is preferably 0.5 to 15 parts by weight, more preferably 1 to 10 parts by weight, based on 100 parts by weight of the ethylene / unsaturated carboxylic acid ester copolymer. If the amount added exceeds 15 parts by weight, the slipperiness and blocking property of the seal film for peel-open packaging material of the present invention may deteriorate. Further, from the viewpoint of the balance between the sliding property of the seal film for peeling and opening packaging material and the sealing property with the adherend, the tackifier is preferably a hydrogenated resin, and particularly, a hydrogenated terpene resin. Is preferred. When the hydrogenated resin is added as a tackifier, the addition amount is preferably 0.5 to 15 parts by weight, more preferably 1 to 10 parts by weight, per 100 parts by weight of the ethylene / unsaturated carboxylic acid ester copolymer. .

The resin composition constituting the seal layer is prepared by dry-blending each component in a predetermined ratio in advance and then melt-kneading them in a kneading device, or by directly mixing each component in a predetermined ratio with various film forming machines. It can be prepared by a method such as supplying to an extruder and melting and kneading.

The resin material constituting the support layer in the seal film and the laminate of the present invention is composed of low density polyethylene (LDPE), high density polyethylene (HDPE), and ethylene / α-olefin copolymer (LLDPE). Consisting of ingredients selected from the group, 0.923 g /
It has a density of cm ³ or more. The density of the resin material forming the support layer is preferably 0.924 g / cm ³ or more.
The density here is a density measured according to JIS K7112. When the support layer is made of a resin material having a density of less than 0.923 g / cm ³ , the lubricant in the resin composition forming the seal layer migrates to the surface of the support layer. Also,
In a laminate in which a seal film and a base material are laminated via an adhesive layer, the lubricant migrates to the interface between the adhesive and the base material, and the laminating strength decreases.

Unless the effects of the present invention are remarkably impaired, the resin material constituting the support layer is an antistatic agent, an antioxidant, a heat stabilizer, an ultraviolet absorber, a pigment, a dye, an antibacterial agent, an antifogging agent. Agents, lubricants, anti-blocking agents, plasticizers (mineral oil, wax, etc.) may be contained.

The seal film of the present invention may be a two-layer film comprising the seal layer and the support layer, and is a laminated film having the seal layer, the support layer, and at least one layer other than these. It may be. Examples of layers other than the seal layer and the support layer in the laminated film including three or more layers include layers of a resin material (resin or resin composition) different from the materials of the seal layer and the support layer.

When the seal film of the present invention is a two-layer film comprising the seal layer and the support layer, the thickness thereof is not particularly limited, but from the viewpoint of easy peeling, the total thickness of the film is 20. The thickness of the seal layer and the support layer is preferably about 5 to 50 μm. Further, when the seal film of the present invention is a laminated film having the seal layer, the support layer, and at least one layer other than these, the thickness thereof is not particularly limited, but from the viewpoint of easy peelability, the film is The total thickness is preferably 20 to 150 μm, and the thicknesses of the seal layer, the support layer, and the layers other than the seal layer and the support layer are preferably about 5 to 50 μm.

In the case of a laminated film comprising a seal layer, a support layer, and one or more layers other than these, examples of the resin material constituting the layers other than the seal layer and the support layer include high-density polyethylene, low-density polyethylene, and ethylene. 1 selected from the group consisting of / α-olefin copolymer, polypropylene, ethylene / propylene copolymer, polystyrene, rubber-modified polystyrene, polyester and polyamide.
Examples include resins of more than one kind and resin materials other than the resin materials forming the seal layer and the support layer.

The seal film of the present invention can be produced, for example, by coextruding a resin material forming the seal layer and a resin material forming the support layer to form a film. Specifically, various coextrusion molding methods such as a coextrusion T die cast molding method, a coextrusion inflation molding method, a coextrusion tenter molding method, and a coextrusion laminating molding method can be applied. A seal film further having a layer made of a resin material other than the seal layer and the support layer can be manufactured by the same method.

The seal film of the present invention can be used alone as a container lid or a packaging bag. Further, in order to improve performance such as strength or to impart a desired function, the seal film of the present invention can be laminated with a base material made of an appropriate material to form a laminate. In order to effectively exhibit the function of the seal film, it is important that at least one surface of the laminate is constituted by the seal layer of the seal film. The seal film and the base material may be directly laminated, or may be laminated via another layer. As the substrate, biaxially stretched polyethylene terephthalate film (PET), polyamide stretched film (ONy), unstretched film (CNy), polypropylene stretched film (OPP), or unstretched film (CP)
P), stretched film of ethylene / vinyl alcohol copolymer (OEVOH), or unstretched film (CEV)
A thermoplastic resin film such as OH), a metal foil such as an aluminum foil, and paper are applied.

The laminate of the seal film and the substrate can be formed by an appropriate method such as bonding with an adhesive or bonding by heat fusion, depending on the combination of the materials of the laminated surfaces of both. Specifically, for example, it can be manufactured by a coextrusion laminating method, an extrusion laminating method, a dry laminating method, or the like. In the case of the dry laminating method, generally, at least one of the surfaces to be bonded is subjected to a surface treatment such as corona treatment, and is bonded using a polyether or polyester adhesive. In the case of the extrusion lamination molding method, extrusion lamination is performed so as to sandwich between the surface of the base material coated with the urethane adhesive (anchor coating agent) and the surface of the seal film of the present invention opposite to the seal layer. The resin for melting is melt-extruded and attached.

When the seal film of the present invention is used as a packaging material, the surface opposite to the surface fused to a container or the like is subjected to surface treatment such as corona treatment unless the effect of the present invention is significantly impaired. Alternatively, coating of printing ink or vapor deposition of metal may be performed.

The seal film of the present invention and the laminate formed by laminating the seal film and the base material can be processed into a predetermined shape and used as a lid material for cup-shaped containers or tray-shaped containers. Further, the seal film of the present invention and the laminate formed by laminating the seal film on a base material can be used also as a bag-shaped container such as a three-way seal bag, a four-way seal bag, and a standing pouch. A laminated film is usually applied to these bag-shaped containers as well. For example, a three-sided sealed bag having an opening on one side may be prepared in advance, the contents such as food may be filled into the bag through the opening, and then the opening may be sealed to package the contents. At this time, the sealing layer faces the inside of the bag, and the sealing layers are sealed.

[0028]

As described above in detail, according to the present invention,
It is possible to provide a seal film that is suitable for use as a peel-and-open packaging material such as a lid material for a plastic container by itself or in a state of being bonded to a base material.

[0029]

EXAMPLES The present invention will be described below based on examples.
The present invention is not limited to these examples.

(1) Evaluation method for easy peeling property Polyester monolayer film (manufactured by Toyobo Co., Ltd., trade name "TOYOBO ESTER E5102", thickness 12 μm, width 33)
0 mm) was used as a base material and the corona-treated surface of the seal film obtained by the method described below was dry laminated. Dry laminate is a multi-purpose coater (Yasui Seiki
Manufactured by Takeda Pharmaceutical Co., Ltd., trade name "A515", curing agent, Takeda Pharmaceutical Co., Ltd., trade name "A50", and ethyl acetate. 10 parts by weight: 1 part by weight: 18% by weight and mixed sufficiently) were applied to the surface of the base material to be laminated, and ethyl acetate was sufficiently dried and removed, and then the corona-treated surface of the seal film ( Corona treatment is performed so that it will be 42 dyne / cm or more during film formation)
A laminated body was obtained. The laminate having the seal film for peeling and opening packaging material was aged in a dryer at 40 ° C. for 48 hours and used for evaluation. A heat seal tester was prepared by using a seal film side of the obtained laminate and a sheet having a thickness of 0.6 mm made of rubber-modified polyethylene (HIPS) (manufactured by Japan Polystyrene Co., Ltd., trade name “Nippon Polysti H550”) as an adherend. Using Tester Sangyo Co., Ltd., heat sealing was performed under the conditions of pressure 3 kg / cm ² , time 1 second, width 20 mm, and temperature shown in Table 1. Peel strength is measured by a testing machine (Shimadzu Corporation, trade name "Autograph AG"
S-500 "), and using a test piece cut into a strip shape having a width of 15 mm perpendicular to the seal portion, a pulling speed of 300
The peeling was performed at a rate of mm / min, and the average load at that time was calculated. When this value is 3 N / 15 mm width or more and 20 N / 15 mm width or less, the film is excellent as a seal film in excellent balance between sealing property and easy peeling property.

(2) Method of evaluating laminate strength In the above evaluation of easy peelability, when peeling (delamination) occurs on the adhesive surface between the base material and the seal film during peeling, it is determined that the laminate strength is insufficient, and "X" in 1
Indicate. When peeling did not occur on the adhesive surface between the base material and the seal film, the laminate strength was judged to be good, and is shown by “◯” in Table 1.

(3) Sliding property The laminate prepared by the above evaluation of easy peeling property is wound around a 3-inch paper tube for 20 m. When this winding is again unwound, if it can be unwound without any resistance, the slipperiness is judged to be good, and if it cannot be smoothly unwound, the slidability is judged to be poor. When the slipperiness was measured by the above method using the laminates prepared for the evaluation of easy peeling using the seal films produced in the following Examples 1 to 3 and Comparative Example 1, the slipperiness was good in all cases. Met.

[Example 1] Low density per 100 parts by weight of ethylene / methyl acrylate copolymer resin (Sumitomo Chemical Co., Ltd., trade name "Aklift CG4002", methyl acrylate unit content = 31% by weight) Polyethylene (Sumitomo Chemical Co., Ltd., trade name "Sumikasen: L2"
11 ”, MFR = 2 g / 10 min, density = 0.924 g / c
m ³⁾ 27 parts by weight of an ethylene / alpha-olefin copolymer (Sumitomo Chemical Co., Ltd., "SUMIKATHENE -E: FV40
2 ", MFR = 4g / 10 minutes, density = 0.912g / c
m ³ ) 22 parts by weight, erucic acid amide (lubricant, manufactured by Nippon Seika Co., Ltd., trade name “Nutron S”) and ethylenebisoleic acid amide (produced by Nippon Kasei Co., Ltd., trade name “Sripax-O”) ) Total 0.48 parts by weight, and further 2.3
Part by weight of PMMA beads (manufactured by Nippon Shokubai Co., Ltd., trade name "Evostar MA1010") was added and thoroughly mixed with a blender mixer to obtain a resin composition (hereinafter referred to as "resin composition (1)"). did. This resin composition (1) and an ethylene / α-olefin copolymer (manufactured by Sumitomo Chemical Co., Ltd., trade name “Sumikasen-α: CS8051”,
MFR = 2 g / 10 min, density = 0.940 g / cm ³ ) (hereinafter, referred to as LLDPE-1) with a multilayer T die cast molding machine (made by Chugai Tech Co., Ltd.) and a resin temperature of 230 ° C.
At thickness resin composition (1) / LLDPE-1 = 10/2
The surface of LLDPPE-1 was corona-treated to have a wetting tension of 42 dyne / cm, and a sealing layer made of the resin composition (1) and LLDP.
A seal film composed of a support layer composed of E-1 was obtained. The evaluation results are shown in Table 1.

[Example 2] Low density per 100 parts by weight of ethylene / methyl methacrylate copolymer resin (Sumitomo Chemical Co., Ltd., trade name "Aklift CM5019", methyl methacrylate unit content = 31% by weight) Polyethylene (Sumitomo Chemical Co., Ltd., trade name "Sumikasen:
F200 ", MFR = 2 g / 10 min, density = 0.924
g / cm ³ ) parts by weight and ethylene / α-olefin copolymer (Sumitomo Chemical Co., Ltd., trade name “Sumikasen-E: F”
V402 ", MFR = 4 g / 10 min, density = 0.912
g / cm ³ ) 28 parts by weight, erucic acid amide (lubricant, manufactured by Nippon Seika Co., Ltd., trade name “Nutron S”) and ethylenebisoleic acid amide (manufactured by Nippon Kasei Co., Ltd., trade name “Sripax- O ") in total 0.41 parts by weight, and further 2.9
Part by weight of PMMA beads (manufactured by Nippon Shokubai Co., Ltd., trade name "Evostar MA1010") was added and thoroughly mixed with a blender mixer to obtain a resin composition (hereinafter referred to as "resin composition (2)"). did. This resin composition (2) and ethylene / α-olefin copolymer (Sumitomo Chemical Co., Ltd., trade name “Sumikasen-α: CS8051”,
MFR = 2 g / 10 minutes, density = 0.940 g / cm ³ ) (L
LDPE-1) and a multilayer T die-cast molding machine (made by Chugai Tech Co., Ltd.) at a resin temperature of 230 ° C. so that the thickness of the resin composition (2) / LLDPE-1 = 10/20 μm. Then, the surface made of LLDPE-1 was subjected to corona treatment so as to have a wetting tension of 42 dyne / cm to obtain a seal film made of a seal layer made of the resin composition (2) and a support layer made of LLDPE-1. The evaluation results are shown in Table 1.

[Example 3] Low density per 100 parts by weight of ethylene / methyl methacrylate copolymer resin (Sumitomo Chemical Co., Ltd., trade name "Aklift WK307", methyl methacrylate unit content = 25% by weight) Polyethylene (Sumitomo Chemical Co., Ltd., trade name "Sumikasen: F"
200 ", MFR = 2g / 10min, density = 0.924g
/ Cm ³ ) 4 parts by weight and ethylene / α-olefin copolymer (manufactured by Sumitomo Chemical Co., Ltd., trade name “Sumikasen-E: F
V402 ", MFR = 4 g / 10 min, density = 0.912
g / cm ³ ) 22.5 parts by weight, erucic acid amide (manufactured by Nippon Seika Co., Ltd., trade name “Nutron S”) and ethylenebisoleic acid amide (manufactured by Nippon Kasei Co., Ltd., trade name “ 0.42 parts by weight in total, and further 2.0 parts by weight of PMMA beads (manufactured by Nippon Shokubai Co., Ltd., trade name "Evostar MA1010") and hydrogenated terpene resin (manufactured by Yasuhara Chemical Co., Ltd.) Name "Clearon:
P125 ", Mn = 800) 14 parts by weight, and thoroughly mixed with a blender mixer to obtain a resin composition (hereinafter,
This was designated as resin composition (3)). This resin composition (3) and an ethylene / α-olefin copolymer (manufactured by Sumitomo Chemical Co., Ltd., trade name “Sumikasen-α: CS805”
1 ”, MFR = 2 g / 10 min, density = 0.940 g / c
m ³ ) (LLDPE-1) using a multilayer T die cast molding machine (Chugai Tech Co., Ltd.) at a resin temperature of 230 ° C. Resin composition (3) / LLDPE-1 = 10/20
and the surface of LLDPE-1 was corona-treated so as to have a wetting tension of 42 dyne / cm, and a sealing layer made of the resin composition (3) and LLDPE were formed.
A seal film comprising a supporting layer consisting of -1 was obtained.
The evaluation results are shown in Table 1.

[Comparative Example 1] An ethylene / α-olefin copolymer (manufactured by Sumitomo Chemical Co., Ltd., trade name "Sumikasen-E: FV403", MFR = 4 g / 10 min, density = 0.919 g) was used as a support layer. / Cm ³ ) (hereinafter, referred to as LLDPE-2), the same procedure as in Example 1 is performed, and the sealing film is composed of the sealing layer made of the resin composition (1) and the supporting layer made of LLDPE-2. Got The evaluation results are shown in Table 1.

[0037]

[Table 1] "-" In the table indicates that measurement or evaluation was omitted.
The unit of peel strength in the table is N / 15 mm width.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08K 5/20 C08K 5/20 C08L 23/06 C08L 23/06 23/08 23/08 F term (reference) 4F100 AH03A AK05B AK06A AK06B AK62A AK62B AK70A AL05A BA02 CA19A EH23 GB16 JA13B JK06 JL11 JL14 4J002 BB03X BB05X BB07W EP016 FD176 GG00

Claims (2)

[Claims] 1. A resin of 20 to 150 parts by weight selected from the group consisting of 100 parts by weight of at least one kind of ethylene / unsaturated carboxylic acid ester copolymer, low density polyethylene and ethylene / α-olefin copolymer. And 0.2
To 1.5 parts by weight of a resin composition containing at least one higher fatty acid amide, and a group consisting of low density polyethylene, high density polyethylene and ethylene / α-olefin copolymer. A sealing film having a supporting layer made of a resin material having a density of 0.923 g / cm ³ or more, which is composed of the above components, and one surface of which is constituted by the sealing layer. 2. A laminate having at least one layer comprising the seal film according to claim 1 and a layer of a substrate, at least one surface of which is constituted by the seal layer of the seal film. .