JP2007055159A - Wear-resistant multilayer film and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilayer film having superior wear resistance against repeated contacts, and its manufacturing method. <P>SOLUTION: The wear-resistant multilayer film has at least four layers in which a wear-resistant layer (A)/a polyamide layer (B)/a barrier layer (C)/the polyamide layer (B) are laminated in this order. The wear-resistant layer (A) contains a crystalline polyamide, an amorphous polyamide and a polyester, the polyamide layer (B) contains a crystalline polyamide, and the barrier layer (C) contains a polyamide consisting of a diamine component containing an aromatic ring and a dicarboxylic acid component or a saponification product of a modified ethylene-vinyl acetate copolymer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multilayer film having improved wear resistance by repeated contact.

  Conventionally, a multilayer film containing a nylon resin has been widely used in various directions as a film having gas barrier properties, toughness and the like. This multilayer film is used, for example, as a packaging film for foods distributed in the market. However, pinholes may be generated during transportation, transportation, etc., and the excellent gas barrier properties of the multilayer film are hindered by the pinholes. It was a result. Therefore, further improvement in toughness, particularly improvement in wear resistance is desired from the market.

  The present inventor has examined in detail the pinholes that occur during the transportation, transportation, etc. of a film that wraps food, etc., and that most of the factors that cause pinholes are not due to bending but due to repeated contact wear. I found my own.

  Based on this knowledge, an object of this invention is to provide the multilayer film provided with the outstanding abrasion resistance with respect to a repeated contact, and its manufacturing method.

  As a result of intensive studies to solve the above problems, the present inventor has found that a wear-resistant layer (A) containing crystalline polyamide, amorphous polyamide and polyester, a polyamide layer (B) containing crystalline polyamide, A barrier layer (C) containing a polyamide comprising a diamine component containing an aromatic ring and a dicarboxylic acid component or a saponified modified ethylene-vinyl acetate copolymer has an abrasion resistant layer (A) / polyamide layer (B) / barrier layer ( It was found that a multilayer film having at least four layers laminated in the order of C) / polyamide layer (B) has excellent wear resistance. Based on this knowledge, further studies have been made and the present invention has been completed.

  That is, this invention provides the following multilayer film and its manufacturing method.

  Item 1. An abrasion-resistant multilayer film having at least four layers laminated in the order of an abrasion-resistant layer (A) / polyamide layer (B) / barrier layer (C) / polyamide layer (B). Includes a crystalline polyamide, an amorphous polyamide, and a polyester, the polyamide layer (B) includes a crystalline polyamide, and the barrier layer (C) includes a diamine component containing an aromatic ring and a dicarboxylic acid component, or a modified ethylene. A wear-resistant multilayer film comprising a saponified vinyl acetate copolymer;

  Item 2. The crystalline polyamide contained in the wear-resistant layer (A) or the polyamide layer (B) is polycapramide (nylon-6), poly-ω-aminoheptanoic acid (nylon-7), poly-ω-aminononanoic acid (nylon-9). ), Polyundecanamide (nylon-11), polylauryl lactam (nylon-12), polyethylenediamine adipamide (nylon-2, 6), polytetramethylene adipamide (nylon-4, 6), polyhexamethylene Adipamide (nylon-6, 6), polyhexamethylene sebamide (nylon-6, 10), polyhexamethylene dodecamide (nylon-6, 12), polyoctamethylene adipamide (nylon-8, 6) ), Polydecamethylene adipamide (nylon-10, 8), and xylylenediamine-based polyamide Item 2. The wear-resistant multilayer film according to Item 1, which is at least one selected.

  Item 3. The amorphous polyamide contained in the wear resistant layer (A) is a polymer of hexamethylenediamine-isophthalic acid, a polymer of hexamethylenediamine-terephthalic acid, and hexamethylenediamine-terephthalic acid-hexamethylenediamine-isophthalic acid. Item 3. The wear-resistant multilayer film according to Item 1 or 2, which is at least one selected from the group consisting of copolymers.

  Item 4. Item 4. The wear-resistant multilayer film according to any one of Items 1 to 3, wherein the polyester in the wear-resistant layer (A) is a polyester copolymer.

  Item 5. Item 1-4 wherein the content of the crystalline polyamide in the wear-resistant layer (A) is 50 to 80% by weight, the content of the amorphous polyamide is 15 to 40% by weight, and the content of the polyester is 5 to 15% by weight. The wear-resistant multilayer film according to any one of the above.

  Item 6. Item 6. The wear-resistant multilayer film according to any one of Items 1 to 5, wherein the total thickness of the film is about 10 to 40 μm.

  Item 7. Resin composition of wear-resistant layer (A) containing crystalline polyamide, amorphous polyamide and polyester, resin composition of polyamide layer (B) containing crystalline polyamide, diamine component and dicarboxylic acid component containing aromatic ring, A resin composition of a barrier layer (C) containing a polyamide or a modified ethylene-vinyl acetate copolymer consisting of wear-resistant layer (A) / polyamide layer (B) / barrier layer (C) / polyamide layer (B) A method for producing a wear-resistant multilayer film, wherein the layers are laminated by coextrusion so as to be in order, stretched in two directions in the vertical and horizontal directions, and heat treated.

  Item 8. A food package, wherein the food is packaged with the wear-resistant multilayer film according to any one of Items 1 to 6.

The present invention is described in detail below.
I. Abrasion-resistant multilayer film The multilayer film of the present invention comprises a wear-resistant layer (A) containing crystalline polyamide, amorphous polyamide and polyester, a polyamide layer (B) containing crystalline polyamide, and a barrier layer (C). A polyamide comprising a diamine component containing an aromatic ring and a dicarboxylic acid component or a saponified modified ethylene-vinyl acetate copolymer, comprising a wear-resistant layer (A) / polyamide layer (B) / barrier layer (C) / polyamide layer ( It has at least four layers laminated in the order of B). The multilayer film of the present invention is excellent in barrier properties, toughness, and abrasion resistance due to repeated contact.

  The abrasion resistant layer (A) in the multilayer film of the present invention contains crystalline polyamide, amorphous polyamide, and polyester. The main component is crystalline polyamide.

  The crystalline polyamide contained in the wear-resistant layer (A) is not particularly limited, but polycapramide (nylon-6), poly-ω-aminoheptanoic acid (nylon-7), poly-ω-aminononanoic acid (nylon- 9), polyundecanamide (nylon-11), polylauryl lactam (nylon-12), polyethylenediamine adipamide (nylon-2, 6), polytetramethylene adipamide (nylon-4, 6), polyhexa Methylene adipamide (nylon-6, 6), polyhexamethylene sebamide (nylon-6, 10), polyhexamethylene dodecamide (nylon-6, 12), polyoctamethylene adipamide (nylon-8, 6), polydecamethylene adipamide (nylon-10, 8), etc., among which two or more of the above poly An amide or the like may be mixed. Of these, nylon-6 is preferred.

  In addition to the above, the abrasion-resistant layer (A) may contain a crystalline polyamide having an aromatic ring in the diamine component. Specifically, it is a polyamide comprising a diamine component containing an aromatic ring and a dicarboxylic acid component, preferably a xylylenediamine-based polyamide. More specifically, MXD-6 nylon composed of metaxylidinediamine and adipic acid can be mentioned. When the wear-resistant layer (A) contains a polyamide having an aromatic ring in the diamine component, the content thereof may be about 10 to 40% by weight with respect to the total weight of the wear-resistant layer (A).

  Although there is no restriction | limiting in particular as an amorphous polyamide which comprises an abrasion-resistant layer (A), As for the main frame | skeleton, what polymerized hexamethylenediamine and terephthalic acid and / or isophthalic acid is mentioned. Specific examples include a polymer of hexamethylenediamine-isophthalic acid, a polymer of hexamethylenediamine-terephthalic acid, and a copolymer of hexamethylenediamine-terephthalic acid-hexamethylenediamine-isophthalic acid.

  Although there is no restriction | limiting in particular as polyester which comprises an abrasion-resistant layer (A), A polyester copolymer is suitable. The polyester copolymer is obtained by reacting an aromatic dicarboxylic acid or an ester-forming derivative thereof with a diol component.

  Examples of the aromatic dicarboxylic acid include terephthalic acid, dimethyl terephthalate, isophthalic acid, dimethyl isophthalate, orthophthalic acid, dimethyl orthophthalate, naphthalenedicarboxylic acid, dimethyl naphthalenedicarboxylate, and the like.

  Examples of the diol component include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, , 6-hexanediol and the like.

  The polyester copolymer is preferably composed of terephthalic acid and isophthalic acid as the aromatic dicarboxylic acid and ethylene glycol as the diol component.

  The wear resistant layer (A) is characterized by the melt viscosity of the polyester copolymer. The melt viscosity of the polyester copolymer is preferably in the region of a slightly higher viscosity than the main component crystalline polyamide. In this case, the mixed state becomes non-uniform and excellent wear resistance performance is exhibited. For example, the polyester copolymer is about 900 to 2500 Pa · s, more preferably about 1600 to 2000 Pa · s with respect to crystalline polyamide (about 800 Pa · s). On the other hand, when the melt viscosity of the polyester copolymer and the crystalline polyamide is close, the mixed diffusion state is good, which is disadvantageous for the expression of wear resistance.

  The melt viscosity is measured with a flow tester CFT-100D (die length 2 mm, die diameter 1 mm, load 6 kg, 250 ° C. constant temperature measurement) manufactured by Shimadzu Corporation.

  The content of each component in the wear-resistant layer (A) is not particularly limited as long as the main component is crystalline polyamide, but the crystalline polyamide is about 50 to 80% by weight (preferably 55 to 75% by weight). About 15 to 40% by weight (preferably about 20 to 35% by weight) of amorphous polyamide, and about 5 to 15% by weight (preferably about 5 to 10% by weight) of polyester. . More preferably, the crystalline polyamide is about 55 to 75% by weight, the amorphous polyamide is about 20 to 35% by weight, and the polyester is about 5 to 10% by weight.

  This is because by adding a certain amount of amorphous polyamide and polyester to crystalline polyamide to harden the film, the abrasion resistance layer (A) is resistant to abrasion by repeated contact (especially pinhole resistance). ).

  As a preferred composition of the abrasion-resistant layer (A), for example, polycapramide (nylon-6) as a crystalline polyamide, a copolymer of hexamethylenediamine and terephthalic acid as an amorphous polyamide, and terephthalic acid and isophthalic acid as polyesters A copolymer with ethylene glycol may be mentioned.

  In addition, in the abrasion-resistant layer (A), different types of polymers may be mixed as long as the object of the present invention is not hindered, and organics such as antioxidants, heat stabilizers, lubricants, ultraviolet absorbers, etc. The additive may be added to the extent that it is normally added.

  The polyamide layer (B) in the multilayer film of the present invention contains crystalline polyamide.

  The polyamide layer (B) is not particularly limited as long as the main component is crystalline polyamide, but the crystalline polyamide is preferably about 60 to 100% by weight (preferably about 80 to 100% by weight). It is. As crystalline polyamide, what is contained in the said abrasion-resistant layer (A) is used suitably. Polycapramide (nylon-6) and xylylenediamine-based polyamide are preferable.

  In the polyamide layer (B), different types of polymers may be mixed within the range that does not impair the object of the present invention, and organic additives such as antioxidants, heat stabilizers, lubricants, ultraviolet absorbers and the like are added. It may be added to the extent that the agent is usually added.

  The barrier layer (C) in the multilayer film of the present invention contains polyamide or a modified ethylene-vinyl acetate copolymer saponified product comprising a diamine component containing an aromatic ring and a dicarboxylic acid component.

  Examples of polyamides comprising a diamine component containing an aromatic ring and a dicarboxylic acid component include xylylenediamine-based polyamides. More specifically, MXD-6 nylon composed of metaxylidinediamine and adipic acid can be mentioned.

Examples of the modified ethylene-vinyl acetate copolymer include (1) a resin in which -OCOCH ₃ is partially saponified, (2) a resin in which -OCOCH ₃ is partially substituted with -OCOCH ₂ CH ₃ , and (3) anhydrous maleic acid. Examples thereof include resins obtained by partially graft polymerization of an acid anhydride such as an acid. A resin obtained by partially saponifying —OCOCH ₃ is preferable.

  The saponified ethylene-vinyl acetate copolymer is not particularly limited, but the ethylene content is about 20 to 65 mol%, preferably about 29 to 44 mol%, the saponification degree is about 90% or more, preferably about 95% or more. Can be illustrated.

  The barrier layer (C) is not particularly limited as long as the main component is the above component, but it is preferable that these components be about 70 to 100% by weight (preferably about 90 to 100% by weight). is there.

  By this barrier layer (C), a high gas barrier property, a water vapor barrier property and the like are imparted to the multilayer film of the present invention.

  In the barrier layer (C), different types of polymers may be mixed as long as the object of the present invention is not impaired, and organic additives such as an antioxidant, a heat stabilizer, a lubricant, and an ultraviolet absorber are added. It may be added to the extent that the agent is usually added.

  The multilayer film of the present invention comprises at least the wear-resistant layer (A), polyamide layer (B), and barrier layer (C) laminated in the order of (A) / (B) / (C) / (B). It is characterized by having four layers. Specifically, a five-layer structure in which (B) / (A) / (B) / (C) / (B) are stacked in this order, (A) / ( B) / (C) / (B) / (A) 5 layers stacked in this order, (B) / (B) / (A) / (B) / (C) / (B) stacked in this order 6 Examples include a layer structure and a six-layer structure in which (B) / (A) / (B) / (C) / (B) / (A) are stacked in this order.

  When a multilayer film having layers with different front and back surfaces (for example, a four-layer film laminated in the order of (A) / (B) / (C) / (B)) is used as a packaging film for food, etc., a polyamide layer The (B) side can be the inside (food side), and the wear-resistant layer (A) side can be the outside.

Or you may have the layer which has resin compositions other than (A), (B) and (C) as needed.
II. Production method of multilayer film The wear-resistant multilayer film of the present invention is a flat multilayer film that is co-extruded on a chill roll in which cooling water circulates from a T die so that the resin composition of each layer is in the above-described order, for example. Obtainable.

  The obtained film is longitudinally stretched 2 to 4 times (preferably 2.5 to 3 times) by a roll stretching machine at 50 to 100 ° C., for example, and further 2 to 5 by a tenter stretching machine in an atmosphere at 90 to 150 ° C. The film can be obtained by transversely stretching it twice (preferably 3 to 4 times) and subsequently heat-treating in the 180-220 ° C. atmosphere with the same tenter.

  The multilayer film obtained by subjecting the multilayer film of the present invention to uniaxial stretching or biaxial stretching (simultaneous biaxial stretching, sequential biaxial stretching) may be subjected to corona discharge treatment on both surfaces or one surface if necessary. You can also.

  The total thickness of the film of the present invention produced by the above method is about 10 to 40 μm, preferably about 12 to 25 μm. The thickness of the abrasion resistant layer (A) is about 2 to 10 μm, preferably about 2 to 5 μm. The thickness of the barrier layer (C) is about 2 to 10 μm, preferably about 2 to 5 μm. The thickness of the polyamide layer (B) is about 2 to 10 μm, preferably about 2 to 5 μm.

In addition, you may provide the adhesive resin layer of a sealant layer, etc. as needed between the outer layer or each interlayer of the multilayer film of this invention.
III. Features and Applications of Multilayer Films The wear-resistant multilayer film of the present invention is excellent in gas barrier properties, toughness, etc., and excellent in wear resistance due to repeated contact. This “abrasion resistance by repeated contact” is evaluated by the method described in Examples described later.

  Specifically, the multilayer film is mounted on a conical aluminum jig, and the apex of the conical shape is brought into contact with the cardboard through the multilayer film. Next, a load of 10 to 120 g is placed on the jig and the slide is slid at a moving distance of 45 mm at a speed of 2700 mm / min under the condition of a humidity of 65%, and the number of sliding times until the pinhole is opened is counted. (See, for example, FIG. 1). The occurrence of pinholes is determined by dripping the penetrating solution where the top of the jig hits the film. Under such measurement conditions, in the multilayer film of the present invention, when the load is 63 g, the number of sliding times until the pinhole is opened is 280 times or more, preferably 350 times or more, more preferably 400 times or more. If it is less than 280, the wear resistance is low, and pinholes are likely to occur due to repeated wear during actual transportation.

  Since the multilayer film of the present invention is excellent in gas barrier properties, toughness, and abrasion resistance due to repeated contact, it is suitable for packaging heavy items, particularly foods such as bags and winners. It is also suitable for packaging frozen foods that are transported at low temperatures. Furthermore, since the multilayer film of the present invention has high transparency, it is easy to visually check the contents (food) when it is used as a food package.

  The multilayer film of the present invention has excellent barrier properties and excellent resistance to abrasion due to repeated contact. Therefore, the multilayer film of the present invention is suitable for the packaging of foods such as straws and winners. It is also suitable for packaging frozen foods that are transported at low temperatures.

  Next, the present invention will be described in more detail by way of examples together with comparative examples, but is not limited thereto.

  The melt viscosity was measured by a flow tester CFT-100D (die length 2 mm, die diameter 1 mm, load 6 kg, 250 ° C. constant temperature method measurement) manufactured by Shimadzu Corporation.

Example 1
Nylon-6 (melt viscosity: 800 Pa · s, the same applies hereinafter) (70 parts by weight) as crystalline polyamide, “X21” (melt viscosity: 1300 Pa · s, the same applies hereinafter) manufactured by Mitsubishi Engineering Plastics (30 wt) Part) and polyester as “KR-371” (melt viscosity: 1800 Pa · s, the same applies hereinafter) manufactured by Mitsubishi Rayon Co., Ltd. (5 parts by weight) was used to form a resin composition constituting the abrasion-resistant layer (A).

  Nylon-6 was used as the resin composition constituting the polyamide layer (B).

  Saponified ethylene-vinyl acetate copolymer (ethylene content 32 mol%, saponification degree 99%) was used as the resin composition constituting the barrier layer (C).

  The resin constituting each layer is co-extruded on a chill roll in which cooling water circulates from a T die so as to be in the order of (A) / (B) / (C) / (B). A film was obtained. This four-layer film was longitudinally stretched 3.0 times with a 65 ° C roll stretcher, then stretched 4.0 times with a tenter stretcher at 110 ° C atmosphere, and further in an atmosphere at 210 ° C with the same tenter. And a four-layer film having a thickness of 15 μm was obtained. The thickness of each layer was 4/4/3/4 (μm).

Example 2
Nylon-6 (70 parts by weight) as a crystalline polyamide, “X21” (30 parts by weight) as an amorphous polyamide, and “KR-371” (10 parts by weight) manufactured by Mitsubishi Rayon Co., Ltd. as a polyester. A four-layer film having a thickness of 15 μm was obtained in the same manner as in Example 1 except that the resin composition constituting the layer (A) was used. The thickness of each layer was 4/4/3/4 (μm).

Example 3
Nylon-6 (70 parts by weight) as a crystalline polyamide, “X21” (30 parts by weight) as an amorphous polyamide, and “KR-371” (15 parts by weight) manufactured by Mitsubishi Rayon Co., Ltd. as a polyester. A four-layer film having a thickness of 15 μm was obtained in the same manner as in Example 1 except that the resin composition constituting the layer (A) was used. The thickness of each layer was 4/4/3/4 (μm).

Example 4
A 4-layer film having a thickness of 15 μm was obtained in the same manner as in Example 2 except that MXD-6 nylon was used as the resin composition constituting the barrier layer (C) instead of the saponified ethylene-vinyl acetate copolymer. It was. The thickness of each layer was 4/4/3/4 (μm).

Example 5
Thickness is the same as in Example 1 except that the resin constituting each layer is a five-layer film in the order of (B) / (A) / (B) / (C) / (B). A 15 μm 5-layer film was obtained. The thickness of each layer was 3/3/3/3/3 (μm).

Example 6
The thickness of the resin constituting each layer is the same as in Example 2 except that the five-layer film is formed in the order of (B) / (A) / (B) / (C) / (B). A 15 μm 5-layer film was obtained. The thickness of each layer was 3/3/3/3/3 (μm).

Example 7
Thickness is the same as in Example 3 except that the resin constituting each layer is a five-layer film in the order of (B) / (A) / (B) / (C) / (B). A 15 μm 5-layer film was obtained. The thickness of each layer was 3/3/3/3/3 (μm).

Example 8
Thickness is the same as in Example 4 except that the resin constituting each layer is a five-layer film in the order of (B) / (A) / (B) / (C) / (B). A 15 μm 5-layer film was obtained. The thickness of each layer was 3/3/3/3/3 (μm).

Example 9
Thickness is the same as in Example 2 except that the resin constituting each layer is a five-layer film in the order of (A) / (B) / (C) / (B) / (A). A 15 μm 5-layer film was obtained. The thickness of each layer was 3/3/3/3/3 (μm).

Comparative Example 1
Nylon-6 was used as the resin composition constituting the polyamide layer (B).

  Saponified ethylene-vinyl acetate copolymer (ethylene content 32 mol%, saponification degree 99%) was used as the resin composition constituting the barrier layer (C).

  The resin constituting each layer is coextruded on a chill roll in which cooling water circulates from a T die so as to be in the order of (B) / (B) / (C) / (B). A film was obtained. This four-layer film was longitudinally stretched 3.0 times with a 65 ° C roll stretcher, then stretched 4.0 times with a tenter stretcher at 110 ° C atmosphere, and further in an atmosphere at 210 ° C with the same tenter. And a four-layer film having a thickness of 15 μm was obtained. The thickness of each layer was 4/4/3/4 (μm).

Comparative Example 2
A 4-layer film having a thickness of 15 μm was obtained in the same manner as in Comparative Example 1 except that MXD-6 nylon was used as the resin composition constituting the barrier layer (C) instead of the saponified ethylene-vinyl acetate copolymer. It was. The thickness of each layer was 4/4/3/4 (μm).

Comparative Example 3
The thickness of the resin constituting each layer is the same as in Comparative Example 1 except that the resin is a five-layer film in the order of (B) / (B) / (B) / (C) / (B). A 15 μm 5-layer film was obtained. The thickness of each layer was 3/3/3/3/3 (μm).

Comparative Example 4
The thickness of the resin constituting each layer is the same as in Comparative Example 2 except that the resin is a five-layer film in the order of (B) / (B) / (B) / (C) / (B). A 15 μm 5-layer film was obtained. The thickness of each layer was 3/3/3/3/3 (μm).

Test example 1
About the film obtained in Examples 1-9 and Comparative Examples 1-4, the abrasion resistance evaluation which measures the pinhole which generate | occur | produces by repeated contact was performed as follows.

A film is attached to a jig made of aluminum with a cone shape using tape or the like, and the apex of the cone-shaped jig is placed on the cardboard through the film (for KOKUYO Campus, for fine puss, 430g / m ² ). The vertex R was set to a sliding direction R = 0.1 to 1.0 mm, and a direction R = 0.1 to 1.0 mm perpendicular to the sliding direction. Next, a load of 63 g was placed on the jig. The jig was slid in parallel with the cardboard at a speed of 2700 mm / min and a moving distance of 45 mm under the condition of a humidity of 65%, and the number of sliding times until a pinhole was formed was counted. The occurrence of pinholes was determined based on whether or not the penetrating solution was dropped onto the film where the top of the jig had hit and permeated on white paper. For eight samples, the number of sliding until a pinhole was formed was measured, and the average value was calculated.

  FIG. 1 shows a schematic diagram of the measuring apparatus. FIG. 2 shows an example of a conical aluminum jig.

  The results of the abrasion resistance evaluation in the multilayer films obtained in the examples and comparative examples are shown in Table 1 and FIG.

  According to FIG. 3, it turns out that the multilayer film of Examples 1-9 is excellent in the abrasion resistance by repeated contact. On the other hand, it turns out that all the multilayer films of Comparative Examples 1 to 4 have low wear resistance due to repeated contact.

The schematic diagram of the measuring apparatus used for evaluation of the pinhole which generate | occur | produces by repeated contact is shown. It is a figure which shows an example of a cone-shaped aluminum jig. It is a graph which shows the result of the evaluation of the pinhole which arose in the multilayer film of an Example and a comparative example due to the abrasion by repeated contact.

Claims (8)

An abrasion-resistant multilayer film having at least four layers laminated in the order of an abrasion-resistant layer (A) / polyamide layer (B) / barrier layer (C) / polyamide layer (B). Includes a crystalline polyamide, an amorphous polyamide, and a polyester, the polyamide layer (B) includes a crystalline polyamide, and the barrier layer (C) includes a diamine component containing an aromatic ring and a dicarboxylic acid component, or a modified ethylene. A wear-resistant multilayer film comprising a saponified vinyl acetate copolymer; The crystalline polyamide contained in the wear-resistant layer (A) or the polyamide layer (B) is polycapramide (nylon-6), poly-ω-aminoheptanoic acid (nylon-7), poly-ω-aminononanoic acid (nylon-9). ), Polyundecanamide (nylon-11), polylauryl lactam (nylon-12), polyethylenediamine adipamide (nylon-2, 6), polytetramethylene adipamide (nylon-4, 6), polyhexamethylene Adipamide (nylon-6, 6), polyhexamethylene sebamide (nylon-6, 10), polyhexamethylene dodecamide (nylon-6, 12), polyoctamethylene adipamide (nylon-8, 6) ), Polydecamethylene adipamide (nylon-10, 8), and xylylenediamine-based polyamide The wear-resistant multilayer film according to claim 1, which is at least one selected. The amorphous polyamide contained in the wear resistant layer (A) is a polymer of hexamethylenediamine-isophthalic acid, a polymer of hexamethylenediamine-terephthalic acid, and hexamethylenediamine-terephthalic acid-hexamethylenediamine-isophthalic acid. The wear-resistant multilayer film according to claim 1 or 2, which is at least one selected from the group consisting of copolymers. The abrasion-resistant multilayer film according to any one of claims 1 to 3, wherein the polyester in the abrasion-resistant layer (A) is a polyester copolymer. The content of crystalline polyamide in the wear-resistant layer (A) is 50 to 80% by weight, the content of amorphous polyamide is 15 to 40% by weight, and the content of polyester is 5 to 15% by weight. 5. A wear-resistant multilayer film according to any one of 4 above. The wear resistant multilayer film according to any one of claims 1 to 5, wherein the total thickness of the film is about 10 to 40 µm. Resin composition of wear-resistant layer (A) containing crystalline polyamide, amorphous polyamide and polyester, resin composition of polyamide layer (B) containing crystalline polyamide, diamine component and dicarboxylic acid component containing aromatic ring, A resin composition of a barrier layer (C) containing a polyamide or a modified ethylene-vinyl acetate copolymer consisting of wear-resistant layer (A) / polyamide layer (B) / barrier layer (C) / polyamide layer (B) A method for producing a wear-resistant multilayer film, wherein the layers are laminated by coextrusion so as to be in order, stretched in two directions in the vertical and horizontal directions, and heat treated. A food package comprising a food packaged with the wear-resistant multilayer film according to any one of claims 1 to 6.

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