KR20150020262A - Layered film - Google Patents

Abstract

A laminated film and a flooring excellent in curl and transparency and gloss are provided. Such a laminated film is a laminated film obtained by laminating a surface layer, an intermediate layer and a heat seal layer in this order, wherein the heat seal layer comprises a heat seal layer (A) composed of a linear low density polyethylene resin obtained by copolymerizing ethylene and? And the flooring according to the present invention is a flooring material characterized by comprising the laminated film.

Description

Laminated film {LAYERED FILM}

The present invention relates to a laminated film.

The present application claims priority based on Japanese Patent Application No. 2012-116135 filed on May 22, 2012, the contents of which are incorporated herein by reference.

BACKGROUND ART [0002] Conventionally, a package made of plastic is used as a packaging container for storing contents such as foods and drinks. The package consists of a flooring containing the contents and a covering material sealed to the flooring. This flooring material is used, for example, by molding a laminated film into a form suitable for contents by vacuum molding or pressure blank molding.

The required performance of a film used for such a package generally includes gas barrier property, pinhole resistance, and the like. In addition, in recent years, in addition to functions relating to the protection of contents, performance suitable for contents has been demanded. As such required characteristics, for example, transparency which enables recognition and distinction of content, glossiness .

One of the other required characteristics is the curl property. Curling refers to how much curl is generated in the flange portion of the package when the bottom cover and the cover are sealed. If the curl is bad, that is, if the curl generated in the flange portion of the package is large, defects may occur at the time of conveyance in a belt conveyor at the time of manufacture, or when it is necessary to attach a label printed on the package, (Lamination) can not be carried out. Therefore, a laminate having excellent curl is required.

In order to solve such a problem, a package made of a gas barrier multilayer film as in Patent Document 1 has been developed, but this has not been able to fundamentally solve the curl, and development of a package satisfying the above- .

Japanese Patent Application Laid-Open No. 2010-234718

An object of the present invention is to provide a laminated film excellent in curling, transparency, and gloss.

This object is achieved by the present invention described in the following (1) to (13).

(1) A laminated film obtained by laminating a surface layer, an intermediate layer and a heat seal layer in this order, wherein the heat seal layer is a heat seal layer composed of a linear low density polyethylene resin obtained by copolymerizing ethylene and? (A). ≪ / RTI >

(2) The laminated film according to (1), wherein the heat seal layer further contains another heat seal layer (B).

(3) The laminated film according to (2), wherein the heat seal layer (B) is composed of a linear low-density polyethylene resin obtained by copolymerizing ethylene and? -Olefin having 8 carbon atoms.

(4) The laminated film according to any one of (1) to (3), wherein the thickness of the heat seal layer (A) is not less than 3 m and not more than 100 m.

(5) The laminated film according to any one of (2) to (4), wherein the thickness of the heat seal layer (B) is not less than 3 m and not more than 100 m.

(6) When the thickness of the heat seal layer A is H (A) and the thickness of the heat seal layer B is H (B), the ratio of the thickness represented by H (A) / H (2) to (5), wherein the thickness of the laminated film is 1.0 or more and 5.0 or less.

(7) The laminated film described in any one of (1) to (6) above, wherein the surface layer is composed of a polypropylene resin.

(8) The laminated film according to any one of (1) to (7), wherein the intermediate layer is constituted by a polyamide resin.

(9) The laminated film according to any one of (1) to (8), wherein an adhesive layer composed of an adhesive resin is provided between the surface layer and the intermediate layer or between the intermediate layer and the heat seal layer.

(10) The laminated film according to any one of (1) to (9), wherein the thickness of the laminated film is not less than 50 μm and not more than 250 μm.

(11) The laminated film according to any one of (1) to (10) above, wherein the haze of the laminated film is 15% or less and the surface gloss (gloss value)

(12) A flooring comprising the laminated film according to any one of (1) to (11).

(13) A package made of the flooring material according to (12) above.

According to the present invention, a laminated film excellent in curling, transparency and gloss can be provided.

1 is a cross-sectional view of a laminated film according to a first embodiment of the present invention.
2 is a cross-sectional view of a laminated film according to a second embodiment of the present invention.
3 is a cross-sectional view of a bottom material constituted by the laminated film of the present invention.
4 is a cross-sectional view of a package having the laminated film of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail based on a highly suitable embodiment shown below.

≪ First Embodiment >

First, the first embodiment of the laminated film of the present invention will be described.

1 is a cross-sectional view showing an example of the laminated film 100 of the first embodiment.

As shown in Fig. 1, the laminated film 100 according to the first embodiment of the present invention has the surface layer 1, the intermediate layer 2, and the heat seal layer 3 arranged in this order. The heat seal layer 3 contains a heat seal layer (A) 31 composed of a linear low density polyethylene resin obtained by copolymerizing ethylene and an? -Olefin having 6 carbon atoms and a heat seal layer (B) 32.

Hereinafter, each constitution of the laminated film 100 will be described in detail.

≪ Surface layer &

Examples of the material of the surface layer 1 include a polypropylene resin, a polyester resin, a polyamide resin and an ethylene-vinyl alcohol copolymer (hereinafter referred to as " EVOH resin "). Specifically, when heat sterilization treatment is performed on the package after packaging the contents such as food, beverage or industrial member, the surface layer 1 is exposed to hot water and high temperature steam. Therefore, it is preferable to use a polypropylene resin, a polyamide resin, or a polyester resin having a high melting point, such as polyhexamethylene terephthalate resin, which has high heat resistance as a material for the surface layer 1, It is more preferable to use a polypropylene type resin because it is easy to handle, the raw material unit price is low, and the curling after boiling is good.

As the polypropylene resin, for example, a crystalline polypropylene resin or the like is used. Specifically, a crystalline propylene homopolymer, a crystalline propylene-ethylene random copolymer, a crystalline propylene-α-olefin random copolymer, a crystalline block copolymer of propylene and at least one of ethylene and an α- And the like are used. As the? -Olefin,? -Olefins having 4 to 10 carbon atoms such as 1-butene, 1-pentene, 1-hexene, 1-octene and 1-decene are used. These? -Olefins may be copolymerized at an arbitrary ratio.

The thickness of the surface layer 1 is not particularly limited, but is preferably 3 m or more and 100 m or less, more preferably 5 m or more and 85 m or less, still more preferably 7 m or more and 70 m or less. When the thickness of the surface layer 1 is within the above range, the laminated film 100 having excellent appearance and excellent in gloss can be obtained at relatively low cost.

<Middle layer>

As a material of the intermediate layer 2, for example, a polyamide resin, an EVOH resin and the like can be given, and among these, a polyamide resin is preferably used. By using the polyamide-based resin, the laminated film 100 having both the gas barrier property and the pinhole resistance can be obtained.

Examples of the polyamide resin include nylon-6T which is composed of nylon-6, 6, nylon-6, 10, hexamethylenediamine and terephthalic acid, nylon-6I which is composed of hexamethylenediamine and isophthalic acid, nylon-6I comprising nonanediamine and terephthalic acid -9T, nylon-M5T consisting of methylpentadiamine and terephthalic acid, and nylon-6, 12 composed of caprolactam and lauryllactam. Further, a copolymer of the above-mentioned resin and at least one of nylon-6, nylon-11 and nylon-12 may be used. These resins may be used alone or in combination of two or more. Further, an amorphous aromatic polyamide (amorphous nylon) obtained by a polycondensation reaction of an aliphatic diamine such as hexamethylenediamine with a dicarboxylic acid such as terephthalic acid or isophthalic acid or a derivative thereof may be used.

The thickness of the intermediate layer 2 is not particularly limited, but is preferably 3 m or more and 100 m or less, more preferably 5 m or more and 70 m or less, and further preferably 10 m or more and 50 m or less. When the thickness of the intermediate layer 2 is within the above range, the laminated film 100 excellent in pinhole resistance can be obtained.

<Heat seal layer>

The heat seal layer 3 is composed of a heat seal layer (A) 31 and a further heat seal layer (B) 32. The heat seal layer 3 has a function of resistance to water content and a seal suitability Suitability). In case of the contents whose contents contain a lot of medicine or oil, etc., the properties of the contents of the contents show that the heat seal layer does not lose the function regarding the sealability with the counter material by the medicine or oil.

The heat seal layer 3 contains a heat seal layer (A) 31. The heat seal layer (A) 31 is constituted by a linear low density polyethylene resin obtained by copolymerizing ethylene and? -Olefin having six carbon atoms. By using a linear low-density polyethylene resin for the heat seal layer (A) 31, a heat seal layer 3 having excellent transparency and seal strength can be obtained. Among the above linear low-density polyethylene resins, the use of a linear low-density polyethylene resin obtained by copolymerizing ethylene and an alpha -olefin having 6 carbon atoms gives a heat seal layer 3 excellent in cushioning and workability, A film can be obtained.

The thickness of the heat seal layer (A) 31 is not particularly limited, but is preferably 3 m or more and 100 m or less, more preferably 5 m or more and 80 m or less, still more preferably 7 m or more and 50 m or less. When the thickness of the heat seal layer (A) 31 is within the above range, the laminated film (1) having a good appearance can be obtained at relatively low cost.

The heat seal layer 3 further contains another heat seal layer (B) 32. Examples of the material of the heat seal layer (B) 32 include low density polyethylene resin, linear low density polyethylene resin, medium density low density polyethylene resin, high density polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, Ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate-maleic anhydride copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, . Of these, a linear low-density polyethylene resin and an ethylene-vinyl acetate copolymer are preferable in that they are excellent in transparency, seal strength, curl after boiling and the like. Further, from the viewpoint of excellent cushioning property, workability, and strength, it is preferable to use a linear low-density polyethylene resin obtained by copolymerizing ethylene and? -Olefin having 8 carbon atoms.

Further, the heat seal layer 3 may not contain the heat seal layer (B) 32 if necessary.

The thickness of the heat seal layer (B) 32 is not particularly limited, but is preferably 3 m or more and 100 m or less, more preferably 5 m or more and 80 m or less, still more preferably 7 m or more and 50 m or less. When the thickness of the heat seal layer (B) 32 is within the above range, a laminated film having good appearance can be obtained at a relatively low cost.

The heat seal layer 3 is formed by, for example, a heat seal layer (A) 31 composed of a linear low density polyethylene resin obtained by copolymerizing ethylene and an alpha -olefin having 6 carbon atoms and an alpha olefin having 8 carbon atoms And a heat seal layer (B) (32) composed of a linear low-density polyethylene resin. The heat seal layer 3 contains the heat seal layer (A) 31 and the heat seal layer (B) 32, so that a laminated film excellent in curling can be obtained.

(A) / H (B) when the thickness of the heat seal layer (A) 31 is H (A) and the thickness of the heat seal layer (B) Is preferably 1.0 or more and 5.0 or less, and more preferably 1.4 or more and 4.2 or less. Since the ratio of the thickness expressed by H (A) / H (B) is within the above range, it is possible to suppress the curl after the appearance.

The thickness of the heat seal layer 3 is not particularly limited, but is preferably 3 m or more and 200 m or less, more preferably 20 m or more and 70 m or less, still more preferably 30 m or more and 60 m or less, Or less. When the thickness of the heat seal layer 3 is within the above range, a laminated film having good appearance can be obtained at a relatively low cost.

&Lt; Second Embodiment &gt;

Next, a second embodiment of the laminated film of the present invention will be described.

2 is a cross-sectional view showing an example of the laminated film 100 of the second embodiment.

2, the laminated film 100 according to the second embodiment of the present invention includes a surface layer 1, an adhesive layer (X) 41, an intermediate layer 2, an adhesive layer (Y) 42, (3) are arranged in this order. The heat seal layer 3 contains a heat seal layer (A) 31 composed of a linear low density polyethylene resin obtained by copolymerizing ethylene and an? -Olefin having 6 carbon atoms and a heat seal layer (B) 32.

Hereinafter, each configuration of the laminated film 100 in the second embodiment will be described in detail, but differences from the first embodiment will be mainly described, and description of the same matters will be omitted. In Fig. 2, the same components as those in the first embodiment are denoted by the same reference numerals as those in Fig. 1 described earlier.

The surface layer 1, the intermediate layer 2, the heat seal layer (A) 31 and the heat seal layer (B) 32 in the present embodiment are the surface layer 1 and the intermediate layer 2 of the first embodiment, And the heat seal layer (A) 31 and the heat seal layer (B) 32 can be used.

<Adhesive Layer>

The laminated film 100 in the present embodiment is bonded to the surface layer 1 and the intermediate layer 2 or / and between the intermediate layer 2 and the heat seal layer (A) 31, for example, as shown in Fig. And an adhesive layer 4 made of a resin. The adhesive layer X and the adhesive layer positioned between the surface layer 1 and the intermediate layer 2 as the adhesive layer X and the adhesive layer positioned between the intermediate layer 2 and the heat seal layer A as the adhesive layer Y 42 The adhesive layer 41 and the adhesive layer 42 may be adhered to each other between the adhered layers located on both surfaces of the adhesive layer (between the surface layer 1 and the intermediate layer 2 or between the intermediate layer 2 and the heat- (A) 31), and improves the strength, pinhole resistance, flexibility, formability, and the like of the laminated film 100.

As the material of the adhesive layer (X) 41 and the adhesive layer (Y) 42, a known adhesive resin such as an adhesive polyolefin resin is used. Specifically, as the material of the adhesive layer, for example, an ethylene-methacrylate-glycidyl acrylate terpolymer or a copolymer obtained by grafting a monobasic unsaturated fatty acid, a dibasic unsaturated fatty acid, or an anhydride thereof to various polyolefins (Maleic acid-grafted ethylene-vinyl acetate copolymer, maleic acid-grafted ethylene-? -Olefin copolymer, etc.) and the like. As the monobasic unsaturated fatty acid, acrylic acid, methacrylic acid and the like are used. As the dibasic unsaturated fatty acid, maleic acid, fumaric acid, itaconic acid and the like are used. The materials of the adhesive layer (X) 41 and the adhesive layer (Y) 42 may be the same or different.

The thickness of the adhesive layer (X) 41 is not particularly limited, but is preferably 2 m or more and 50 m or less, more preferably 3 m or more and 40 m or less. When the thickness of the adhesive layer (X) 41 is within the above range, the laminated film 100 imparting good bonding strength can be obtained at relatively low cost.

The thickness of the adhesive layer (Y) 42 is not particularly limited, but is preferably 2 m or more and 70 m or less, more preferably 3 m or more and 60 m or less. When the thickness of the adhesive layer (Y) 42 is within the above-mentioned range, the laminated film 100 imparting good bonding strength can be obtained at relatively low cost.

&Lt; Method of producing laminated film &

Next, a manufacturing method of the laminated film 100 as shown in Fig. 2 will be described.

The laminated film 100 as described above can be obtained by separately forming the surface layer 1 having the adhesive layer X 41, the intermediate layer 3 and the heat seal layer 3 having the adhesive layer Y 42, And then bonding them together by a laminator or the like. The laminated film 100 has a surface layer 1 having an adhesive layer X 41 and an intermediate layer 3 and a heat seal layer 3 having an adhesive layer Y 42 in air- Method, or a co-extrusion T-die method. Particularly, a method of forming a film by a co-extrusion T-die method is preferable from the viewpoints of control of the thickness of the laminated film 100 and transparency, and it is possible to form the film by using an appropriate feed block and a die.

The thickness of the laminated film 100 obtained by the above production method is not particularly limited, but is preferably 50 占 퐉 or more and 250 占 퐉 or less, and more preferably 90 占 퐉 or more and 180 占 퐉 or less. When the thickness of the laminated film 100 is within the above range, it becomes possible to obtain a laminated film having appropriate strength and flexibility.

The haze of the laminated film is not particularly limited, but is preferably 15% or less, more preferably 12% or less. Since the fog of the laminated film is in the range of the above-mentioned substrate, the contents can be clearly recognized.

The cloudiness was calculated by the following method.

A sheet sample in the form of a square measuring 50 mm in length and 50 mm in width was cut from the center of the sheet in accordance with JIS K 7136, and the value measured using NDH-2000 manufactured by Nippon Denshi Kogyo Co., Ltd. was fogged.

The surface gloss (gloss value) of the laminated film is not particularly limited, but is preferably 100 or more, more preferably 120 or more. Since the surface gloss (gloss value) of the laminated film is in the range of the above-mentioned base, the appearance of the contents can be improved.

The surface glossiness (gloss value) was calculated by the following method.

On the basis of JIS Z 8741, surface gloss was measured on the surface of the film under the condition of an input / output angle of 60 ^° using a handy gloss PG-1 manufactured by Nippon Electric Works Co., Ltd. The same measurement was repeated 5 times for the same sample, and the average value of the obtained surface gloss was taken as the surface gloss of the sample.

<Flooring>

Next, the flooring material of the present invention will be described.

3 is a view showing an example of the floor material 200 of the present invention.

As shown in FIG. 3, the bottom material 200 of the present invention is formed by the laminated film 100 described above. The bottom material 200 is obtained by forming recesses (pockets) 201 in the laminated film 100. The contents of food, beverage, industrial parts, and the like are stored in the concave portion 201.

The bottom material 200 is formed by stacking the laminated film 100 such that the surface layer 1 is outside and the heat seal layer 3 is inside.

<Cover material>

As the material of the cover material, for example, a biaxially stretched polypropylene film, a biaxially stretched polyethylene terephthalate film deposited with a metal oxide, and a film laminated with a polyethylene resin are used.

<Package>

4, the package 300 of the present invention comprises a floor material 200 and a lid material 202. After the contents are received in the concave portion 201 of the floor material, the lid material 202 The floor member 200 is sealed and the concave portion 201 of the floor member 200 is sealed. Since the bottom material 200 is constituted by the above-described laminated film 100, the package 300 can be a package having good anti-pinhole properties and gas barrier properties, and also excellent curl, transparency, and glossiness.

Example

Hereinafter, the present invention will be described in detail based on examples and comparative examples, but the present invention is not limited thereto.

(Example 1)

&Lt; Preparation of laminated film &

In order to obtain the laminated film 100, a polypropylene resin (trade name: NORBELEN FL8115, manufactured by Sumitomo Chemical Co., Ltd.) was prepared as a resin constituting the surface layer 1. As the resin constituting the adhesive layer 41, an adhesive resin (product name: QF551, manufactured by Mitsui Chemicals, Inc.) was prepared. As a resin constituting the intermediate layer 2, a polyamide resin (trade name: 1030B2, manufactured by Ube Industries, Ltd.) was prepared. As the resin constituting the adhesive layer 42, an adhesive resin (trade name: NF536, manufactured by Mitsui Chemicals, Inc.) was prepared. As a heat seal layer (A) 31, a linear low density polyethylene resin (Dowex XUS60901.07, trade name, manufactured by Dow Chemical Co.) in which ethylene and an alpha -olefin having 6 carbon atoms were copolymerized was prepared.

The polypropylene resin as the surface layer 1, the adhesive resin as the adhesive layer 41, the polyamide resin as the intermediate layer 2, the adhesive resin as the adhesive layer 42, and the heat seal layer (A) 31), a linear low density polyethylene resin obtained by copolymerizing ethylene and an alpha -olefin having 6 carbon atoms was co-extruded using a feed block and a die to prepare a laminated film (100).

The total thickness of the laminated film 100 of Example 1 was 150 占 퐉, the thickness of the surface layer 1 was 40 占 퐉, the thickness of the adhesive layer 41 was 8 占 퐉, the thickness of the intermediate layer 2 was 40 占 퐉, ) Was 8 mu m, and the thickness of the heat seal layer (A) 31 was 54 mu m.

&Lt; Production of flooring material &

The obtained laminated film was subjected to deep drawing (deep drawing) type automatic vacuum packing machine (Multi Drug, product number: R530) at a molding temperature of 95 占 폚 under conditions of a long side 155 mm, a short side 112 mm, To obtain a floor material (200).

&Lt; Preparation of package &gt;

The package material 300 was obtained by sealing ONy / LL (trade name: 65 μm thick) as the cover material 202 and the floor material having the concave portion formed thereon at a seal temperature of 140 ° C.

(Example 2)

Except that a straight chain low density polyethylene resin (Dowex 2032, trade name, manufactured by Dow Chemical Company) in which ethylene and an alpha -olefin having 8 carbon atoms were copolymerized as the heat seal layer (B) 32 was prepared.

The polypropylene resin as the surface layer 1, the adhesive resin as the adhesive layer 41, the polyamide resin as the intermediate layer 2, the adhesive resin as the adhesive layer 42, and the heat seal layer (A) And a linear low density polyethylene resin obtained by copolymerizing ethylene and an alpha -olefin having 8 carbon atoms as a heat seal layer (B) (32), which is a linear low-density polyethylene resin obtained by copolymerizing ethylene and an alpha -olefin having 6 carbon atoms And then co-extruded using a block and a die to prepare a laminated film 100.

The total thickness of the laminated film 100 of Example 2 is 150 占 퐉, the thickness of the surface layer 1 is 40 占 퐉, the thickness of the adhesive layer 41 is 8 占 퐉, the thickness of the intermediate layer 2 is 40 占 퐉, ) Was 8 mu m, the thickness of the heat seal layer (A) 31 was 36 mu m, and the thickness of the heat seal layer (B) was 18 mu m.

(Example 3)

Except that a straight-chain low-density polyethylene resin (Primeech Polymer Co., Ltd., trade name: Morech 4438CN) was prepared as the heat seal layer (B) 32.

The polypropylene resin as the surface layer 1, the adhesive resin as the adhesive layer 41, the polyamide resin as the intermediate layer 2, the adhesive resin as the adhesive layer 42, and the heat seal layer (A) (Trade name: Moratech 0438CN manufactured by Prime Polymer Co., Ltd.) as a heat seal layer (B) 32, and a linear low density polyethylene resin obtained by copolymerizing ethylene and an alpha -olefin having 6 carbon atoms ) Was co-extruded using a feed block and a multi-manifold die to produce a laminated film 100. [

The total thickness of the laminated film 100 of Example 3 is 150 占 퐉, the thickness of the surface layer 1 is 40 占 퐉, the thickness of the adhesive layer 41 is 8 占 퐉, the thickness of the intermediate layer 2 is 40 占 퐉, ) Was 8 mu m, the thickness of the heat seal layer (A) 31 was 36 mu m, and the thickness of the heat seal layer (B) was 18 mu m.

(Example 4)

And the ratio of H (A) / H (B) (thickness of the sealant) was changed to 4.4.

(Comparative Example 1)

The procedure of Example 1 was repeated except that low density polyethylene (weakly LDPE) (manufactured by Ube Maruzen Co., Ltd., trade name: F222NH) was prepared as the heat seal layer (A)

The total thickness of the laminated film of Comparative Example 1 is 150 占 퐉, the thickness of the surface layer 1 is 40 占 퐉, the thickness of the adhesive layer 41 is 8 占 퐉, the thickness of the intermediate layer 2 is 40 占 퐉, And the thickness of the heat seal layer (A) 31 was 54 m.

(Comparative Example 2)

The procedure of Example 1 was repeated except that LDPE (trade name: Z322, manufactured by Ube Maruzen Co., Ltd.) was used as the heat seal layer (A)

The total thickness of the laminated film of Comparative Example 2 is 150 占 퐉, the thickness of the surface layer 1 is 40 占 퐉, the thickness of the adhesive layer 41 is 8 占 퐉, the thickness of the intermediate layer 2 is 40 占 퐉, And the thickness of the heat seal layer (A) 31 was 54 m.

The following evaluations were performed on the laminated film and the package obtained in the examples and the comparative examples. Evaluation items and contents are shown together.

<Curse>

Immediately after immersing in a water bath at 97 占 폚 for 40 minutes, the curling height of the four corners of the package was measured while the bottom side of the package was placed on a horizontal measuring stand. The respective codes are as follows. The evaluation was carried out with n = 10.

?: The average curl height of the four corners was 10 mm or less.

X: Average curl height of four corners exceeded 10 mm.

&Lt; Thickness and surface gloss (gloss value) &gt;

The degree of cloudiness was measured in accordance with JIS K 7136 by cutting out a sheet-like sample in the form of a square having a length of 50 mm and a width of 50 mm from the center of the sheet and fading the measured value using NDH-2000 manufactured by Nippon Denshi Kogyo Co.,

The surface gloss (gloss value) of the film was measured on the surface of the film under the condition of an input / output angle of 60 ^° using a handy gloss PG-1 manufactured by Japan Electric Works Co., Ltd. based on JIS Z 8741. The same measurement was repeated 5 times for the same sample, and the average value of the obtained surface gloss was taken as the surface gloss of the sample.

Table 1 shows the evaluation results of the above Examples and Comparative Examples.

As apparent from the table, Examples 1 to 4 show good curl, fogging, and surface gloss, but Comparative Examples 1 and 2 are inferior in curling, fogging, or surface gloss Which was not enough.

Industrial availability

The laminated film of the present invention can be used for packaging of foods, medicines, industrial parts and electronic materials in which gas barrier property and pinhole property are required. This laminated film can be used for packaging films for internal bags of bag-in-boxes, which often have a high fluidity such as a liquid, or for packaging processed foods, processed marine products and electronics A pillow package used as a package for a material, and a vacuum packaging package. Particularly, the laminated film can be suitably used as a packaging film for packaging electronic parts such as capacitors having hard corners, a food containing a lot of spiced meat, a food containing a lot of spices, and a packaging film for foods having a pseudo- have.

1 Surface layer 2 Middle layer
3 Heat seal layer 31 Heat seal layer (A)
32 Heat seal layer (B) 4 Adhesion layer
41 Adhesive layer (X) 42 Adhesive layer (Y)
100 laminated film 200 Flooring
201 Concave portion of flooring 202 Cover material
300 package

Claims (13)

A laminate film in which a surface layer, an intermediate layer and a heat seal layer are laminated in this order, characterized in that the heat seal layer comprises a heat seal layer (A) composed of a linear low density polyethylene resin obtained by copolymerizing ethylene and? . The method according to claim 1,
Wherein the heat seal layer further contains another heat seal layer (B). 3. The method of claim 2,
Wherein the heat seal layer (B) is constituted by a linear low density polyethylene resin obtained by copolymerizing ethylene and? -Olefin having 8 carbon atoms. 4. The method according to any one of claims 1 to 3,
Wherein the heat seal layer (A) has a thickness of 3 占 퐉 or more and 100 占 퐉 or less. 4. The method according to any one of claims 1 to 3,
Wherein the heat seal layer (B) has a thickness of 3 占 퐉 or more and 100 占 퐉 or less. 4. The method according to any one of claims 1 to 3,
Wherein the ratio of the thickness represented by H (A) / H (B) is 1.0 or more and 5.0 or less, when the thickness of the heat seal layer A is H (A) and the thickness of the heat seal layer B is H By mass or less. 4. The method according to any one of claims 1 to 3,
Wherein the surface layer is made of a polypropylene resin. 4. The method according to any one of claims 1 to 3,
Wherein the intermediate layer is constituted by a polyamide resin. 4. The method according to any one of claims 1 to 3,
And an adhesive layer composed of an adhesive resin is provided between the surface layer and the intermediate layer or between the intermediate layer and the heat seal layer (A). 4. The method according to any one of claims 1 to 3,
Wherein the thickness of the laminated film is 50 占 퐉 or more and 250 占 퐉 or less. 4. The method according to any one of claims 1 to 3,
Wherein the laminated film has a haze of 15% or less and a surface gloss (gloss value) of 100 or more. A flooring comprising the laminated film according to any one of claims 1 to 3. A package made of the floor material according to claim 12.

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