JP2002127337A - Multi-layer stretched polyamide film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-layer stretched polyamide film excelling in transparency, tensile strength, delaminating resistance, gas barrier property, dimensional stability and retorting property, and suitable for packaging at an economical price. SOLUTION: At least one of layers of a multi-layer stretched polyamide film is a resin layer (X) which is made of a polyamide (A) and a polyester. The polyamide is made of mainly xylene diamine and an aliphatic dicarbonic acid of which carbons are 4-12. The polyester is made of polybutylene terephthalate or mainly the polybythlene terephthalate. A component of the polyamide is 99-75% in weight, and that of the polyester is 1-25% in weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention has excellent transparency, tensile strength, delamination strength, pinhole resistance, gas barrier property, dimensional stability, and excellent retort resistance (hot water treatment resistance). And a multilayer stretched polyamide film suitable for packaging applications.

[0002]

2. Description of the Related Art Various plastic film packaging bags are used in large quantities for packaging foods, medicines, miscellaneous goods, etc. Usually, a biaxially stretched plastic film is used as a base film and a heat sealable sealant film ( For example, a laminated film obtained by laminating a non-oriented film) is used. The base film is required to have excellent properties such as transparency, pinhole resistance, gas barrier properties, dimensional stability, and tensile strength, and also has excellent delamination strength with a sealant film. It is necessary. However, due to recent demands for long-term storage of packaging contents, films obtained by coating a biaxially stretched polyamide film with a vinylidene chloride polymer latex on the surface thereof are widely used in order to impart a high gas barrier property. However, there is a disadvantage that it becomes cloudy due to the hot water treatment, and there is an environmental problem.

[0003] Further, a film using polymetaxylylene adipamide (hereinafter referred to as MXD6) synthesized from adipic acid and metaxylylenediamine as a raw material has excellent gas barrier properties, but has poor pinhole resistance. For this reason, multilayer films have been proposed which are mixed with another polyamide resin, coextruded with a resin layer of polyamide, polyester, polyolefin or the like, or laminated.

[0004] For example, a biaxially stretched film formed from a mixture of MXD6 and an aliphatic polyamide (Japanese Patent Laid-Open No.
JP-A-54176), a biaxially stretched film obtained by laminating MXD6 and an aliphatic polyamide by a tubular method (JP-A-57-51427), a surface layer composed of a mixture of MXD6 and an aliphatic polyamide, and mainly composed of MXD6. Three-layer film having an intermediate layer (JP-A-56-155)
No. 762), and a multilayer film in which at least one layer is composed of a mixture of MXD6 and / or an aliphatic polyamide and an amorphous polyamide (JP-A-4-59244).

However, it is difficult for a biaxially stretched film manufactured using a raw material obtained by simply mixing MXD6 and an aliphatic polyamide to have both gas barrier properties and pinhole resistance.
When they were laminated, there was a disadvantage that the layers were easily delaminated. Further, even in the case of the configuration disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 56-155762, the pinhole resistance was insufficient and there was a problem of delamination. Also, Japanese Patent Application Laid-Open No.
According to the method disclosed in Japanese Patent No. 9244, although the problem of the delamination phenomenon is improved, performances such as pinhole resistance are insufficient when applied to a wide range of uses.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks and has excellent transparency, tensile strength, delamination strength, gas barrier properties, dimensional stability, and excellent retort resistance. The purpose of the present invention is to provide a multilayer stretched polyamide film suitable for packaging applications at an economical price. That is, specifically, the aliphatic polyamide resin layer and the MXD
No delamination phenomenon occurs between the 6 resin layers, and in addition to the excellent mechanical properties, pinhole resistance, and transparency of the aliphatic polyamide resin layer, the MXD6 resin layer has heat resistance and gas barrier properties. It is an object of the present invention to provide a multilayer stretched polyamide film suitable as a packaging material.

[0007]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, it has been found that a multilayer stretched film laminated using a composition comprising a specific component can solve these problems. And arrived at the present invention.

That is, the gist of the present invention is as follows. (1) In at least one layer, 99 to 75% by mass of a polyamide (A) formed mainly from a xylylenediamine component and an aliphatic dicarboxylic acid component having 4 to 12 carbon atoms,
A multilayer stretched polyamide film having a resin layer (X) composed of polybutylene terephthalate or a polyester mainly composed of polybutylene terephthalate in a proportion of 1 to 25% by mass. (2) The multilayer stretched polyamide film according to the above (1), having at least two layers of a resin layer (X) and a resin layer (Y) composed of an aliphatic polyamide (B). (3) In the middle of the resin layer (X) and the resin layer (Y), the polyamide (A) and / or the amorphous polyamide (C) are 50
And 80 to 80% by mass, and the polyamide (B) is 50 to 20% by mass.
The multilayer stretched polyamide film according to the above (1) or (2), comprising at least three layers, having a polyamide resin layer (Z) having a ratio of: (4) The multilayer stretched polyamide film according to any one of the above (1) to (3), wherein the polyester is a modified polybutylene terephthalate obtained by copolymerizing polytetramethylene glycol as a diol component. (5) Talc is added to the resin layer (X) in an amount of 0.01 to 0.5% by mass.
The multilayer stretched polyamide film according to any one of the above (1) to (4). (6) The multilayer stretched polyamide film according to any one of the above (1) to (5), wherein the multilayer stretched film comprises five layers of Y / Z / X / Z / Y. (7) Oxygen permeability is 100 ml / (m ² · d · MPa)
The multilayer stretched polyamide film according to any one of (1) to (6) below.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

[0010] The multilayer stretched polyamide film of the present invention comprises:
In at least one of the constituent layers, polyamide (A) and polybutylene terephthalate (PBT) mainly composed of a xylylenediamine component and an aliphatic dicarboxylic acid component having 4 to 12 carbon atoms, or a polyester mainly containing the same. A resin layer (X) having a ratio of 99 to 75/1 to 25 (% by mass), preferably 97 to 80/3 to 20 (% by mass). When the amount of PBT or the polyester mainly composed of PBT in the resin layer (X) is less than 1% by mass, the effect of improving the pinhole resistance of the film is insufficient. This is not preferable because the oxygen permeability of the film decreases and the haze increases.

The polyamide (A) is a polyamide obtained mainly by a polycondensation reaction of a xylylenediamine component and an aliphatic dicarboxylic acid component having 4 to 12 carbon atoms,
In particular, polymetaxylylene adipamide (MXD6) synthesized from metaxylylene and adipic acid is preferred.

The PBT used in the present invention is obtained by subjecting a terephthalic acid component and a 1,4-butanediol component as main components to a melt polycondensation reaction or a subsequent solid phase polymerization.

The PBT may be appropriately copolymerized with other components as long as the effects of the present invention are not impaired. Examples of the acid component as the copolymerization component include aromatic dicarboxylic acids such as isophthalic acid, (phthalic anhydride), 2,6-naphthalenedicarboxylic acid, and 5-sodium sulfoisophthalic acid, oxalic acid, (succinic anhydride), and adipine. Acid, sebacic acid, azelaic acid, dodecanedicarboxylic acid, dimer acid having 20 to 60 carbon atoms, maleic acid (anhydrous), fumaric acid, (anhydrous)
Aliphatic dicarboxylic acids such as itaconic acid, (anhydrous) citraconic acid and mesaconic acid, alicyclic dicarboxylic acids such as (anhydrous) hexahydrophthalic acid and hexahydroterephthalic acid, p-
Hydroxybenzoic acid, lactic acid, β-hydroxybutyric acid, ε-
Hydroxycarboxylic acids such as caprolactone and (anhydrous)
Examples thereof include polyfunctional carboxylic acids such as trimellitic acid, trimesic acid, (anhydrous) pyromellitic acid and the like. Also,
Examples of the alcohol component as a copolymer component include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,5-pentanediol, 1,6-hexanediol, and neopentyl glycol. Diols such as polyethylene glycol, polypropylene glycol and polytetramethylene glycol; alicyclic diols such as 1,4-cyclohexanedimethanol and 1,4-cyclohexanediethanol; and ethylene oxide or propylene oxide adducts of bisphenol A and bisphenol S And polyfunctional alcohols such as trimethylolpropane, glycerin and pentaerythritol. In particular, polytetramethylene glycol (PTMG) is used as an alcohol component.
Modified PBT copolymerized at ３０30% by mass, more preferably at 5-20% by mass, is particularly preferred for achieving the object of the present invention.

Known methods can be applied as a method for producing PBT or a polyester mainly composed of PBT.
For example, dimethyl terephthalate, 1,4-butanediol, and if necessary, other copolymerization components are charged into a transesterification reactor and reacted at a temperature of about 230 ° C. for about several hours to obtain a transesterification rate of about 95%. An ester is obtained. Next, this was transferred to a polymerization vessel, and tetra-n-
In the presence of a catalyst such as butyl titanate, other copolymer components are added as needed, and the melt weight is reduced under a reduced pressure of 1.3 hPa or less at a temperature of 210 to 250 ° C. until a polyester having a desired viscosity is obtained. What is necessary is just to advance a condensation reaction. Also,
Further, a solid phase polymerization reaction may be performed.

The multilayer stretched polyamide film according to the present invention comprises at least one of the resin layers (X)
As a practical configuration, for example, a configuration having at least two layers of a resin layer (X) and a resin layer (Y) made of an aliphatic polyamide (B), a resin layer (X) and a polyamide ( A) A configuration having at least two layers of a resin layer (W) composed of a mixture of an aliphatic polyamide (B), and a more practical configuration is that a polyamide layer is provided between the resin layer (X) and the resin layer (Y). (A) and / or at least 3 comprising X / Z / Y having a resin layer (Z) in which amorphous polyamide (C) and polyamide (B) are mixed.
It is a configuration having a layer. Among these layer configurations, excellent delamination strength, strength, gas barrier properties, dimensional stability,
The most practical layer configuration having excellent performance such as retort resistance has a five-layer configuration of Y / Z / X / Z / Y, for example.

In the present invention, the aliphatic polyamide (B) used for the resin layer (Y) of the multilayer stretched polyamide film includes nylon 6, nylon 66, nylon 46, nylon 610, nylon 612, nylon 1
2, nylon 11, a copolymerized polyamide thereof, and a mixed polyamide resin. Nylon 6 is particularly preferred. A small amount of another polyamide such as polyamide (A) may be mixed in the resin layer (Y) by mixing a recycled product or the like within a range that does not impair the properties of the multilayer stretched polyamide film of the present invention.

In the present invention, the amorphous polyamide (C) used for the resin layer (Z) of the multilayer stretched polyamide film is a generic term for those having no or poor crystallinity. In general, it is a polymer containing a monomer component having a structure that inhibits crystallization, that is, a side chain or a ring structure. Examples of such a polymer include dicarboxylic acids such as terephthalic acid and isophthalic acid, hexamethylenediamine, 4,4′-diamino-3,3′-dimethyl-dicyclohexylenemethane,
Polyamide obtained by reaction with a diamine such as 4,4'-diamino-dicyclohexylenepropane or isophoronediamine, or copolymerization of the above components with an isocyanate component such as a lactam component or 4,4'-diphenylmethane-diisocyanate. And the like.

In the present invention, the mixing ratio of the polyamide (A) and / or the amorphous polyamide (C) and the polyamide (B) used in the resin layer (Z) of the multilayer stretched polyamide film is as follows. The proportion of the polyamide (B) is preferably 50 to 20% by mass with respect to the amorphous polyamide (C) being 50 to 80% by mass in view of increasing the delamination strength. When the polyamide (A) and the amorphous polyamide (C) are mixed, a sufficient delamination strength can be obtained at an arbitrary mixing ratio. In addition, the resin layer (Z)
By multi-layer co-extrusion using a resin in which polyamide (A) and / or (C) and (B) are melt-mixed in advance, the delamination strength between resin layers is further improved.
The conditions for melt-mixing the polyamides (A) and / or (C) and (B) are as follows:
It is preferable to extrude in the range of 0 to 300 ° C. When the temperature is lower than 250 ° C., the effect of improving the delamination strength is insufficient, and when the temperature is higher than 300 ° C.,
The penetration of the resin into the extruder becomes worse.

Further, talc is added to the resin layer (X) in an amount of 0.01 to 0.01%.
By adding 0.5% by mass, the strength of the obtained multilayer stretched polyamide film can be improved. If the amount of talc to be blended is less than 0.01% by mass, the effect of improving the strength is not exhibited, and if it exceeds 0.5% by mass, the effect of improving the strength is saturated, and the haze of the film is rather deteriorated. Not preferred.

The multilayer stretched polyamide film of the present invention comprises:
Tensile strength 200-350MPa, tensile elongation 80-130
% (Average value of MD and TD), number of pinholes generated 5 or less, hot water shrinkage 0.5 to 4%, haze 8% or less, 20
C., 85% RH environment, oxygen permeability 100 ml / (m
² · d · MPa) or less, each of which has physical properties of delamination strength of 3 N / 15 mm or more. The tensile strength and the hot water shrinkage are both average values in the machine direction (MD) of the film and in the direction perpendicular to the film (TD).

If the tensile strength is less than 200 MPa, the strength of the packaging bag is insufficient, and if it exceeds 350 MPa, not only the quality becomes excessive, but also the operability during film production deteriorates, which is economically undesirable. If the number of pinholes exceeds 5, the strength of the packaging bag is insufficient, which is not preferable. If the hot water shrinkage exceeds 4%, problems such as curling in the process of manufacturing the packaging bag occur, and
%, It is not preferable because not only the quality becomes excessive, but also the operability at the time of film production is lowered. If the haze is more than 8%, the commercial value of the packaging bag decreases, which is not preferable, and the oxygen permeability is 100 ml / (m ² · d).
-If it is larger than MPa), the performance required for long-term storage of the contents will be insufficient.

In order to enhance the practical performance of a packaging bag, the higher the delamination strength, the better. However, the multilayer stretched polyamide film of the present invention has an excellent practical performance of 3 N / 15 mm or more.

As the method for producing the multilayer polyamide film in the present invention, any known method can be employed. That is, a method in which each resin constituting each layer is melted using a separate extruder, extruded from a die after being superimposed by a feed block method, and a method in which several types of molten resins are superimposed and extruded in a multi-manifold die. , A method of laminating each resin layer by lamination, a method of combining these, and the like.

Further, as a stretching method of the multilayer film,
Flat type sequential biaxial stretching method, flat type simultaneous biaxial stretching method, tubular method and the like can be used,
The flat simultaneous biaxial stretching method is most preferable in order to obtain the uniformity of the thickness of the multilayer film and the uniformity of the physical properties in the vertical and horizontal directions.

Next, a production method by the flat simultaneous biaxial stretching method will be described. For example, first, using a three-type, five-layer co-extrusion T-die, a composition comprising nylon 6 from an extruder (a), MXD6 and PBT or a polyester containing the same as a main component and optionally talc from an extruder (b). The composition comprising nylon 6 and MXD6 is extruded from an extruder (c) in a temperature range of 230 to 280 ° C., respectively, to extrude a multi-layered unstretched sheet, adhered to a cooling drum temperature-controlled to room temperature or lower, and rapidly cooled.

Next, the obtained sheet is passed through a hot water bath whose temperature is controlled at 40 to 70 ° C., the water content is adjusted to 3 to 7%, and the sheet is preheated to 140 to 210 ° C. 22
After simultaneous biaxial stretching at 0 ° C. at a stretching ratio of 2 to 4 times each in the vertical and horizontal directions, after a 1 to 5% relaxation treatment in the horizontal direction, 150 to 2
Heat treatment is performed at 20 ° C. for several seconds to obtain a multilayer stretched film having a desired thickness.

If the temperature of the hot water bath is lower than 40 ° C., the impregnation time required to make the unstretched multilayer sheet to have a constant moisture content becomes longer, which is not economical. If the temperature is higher than 70 ° C., the sheet is deformed during impregnation. I do. Also, even if the moisture content is lower than 3%,
If it is higher than 7%, the stretchability is reduced. On the other hand, if the preheating temperature and the stretching temperature are out of the above-mentioned ranges, unevenness in stretching occurs and the film breaks during stretching, which is not preferable.

When the multilayer stretched film of the present invention is used for a packaging bag, it is usually provided with a heat seal property. Further, in order to further increase the gas barrier property and mechanical strength depending on the use, polypropylene, polyethylene, or the like is used. It is used by laminating with a plastic film such as an ethylene-vinyl acetate copolymer or polyester, paper, or a metal foil such as aluminum.

The thickness of the multilayer stretched film in the present invention is not particularly limited, but when it is used as a flexible packaging material, a film having a thickness of 300 μm or less, usually 5 to 50 μm is used.

In order to improve the productivity of the film, an inorganic lubricant such as silica, alumina, kaolin or calcium carbonate or an organic lubricant such as ethylenebisstearylamide can be usually added to improve the slip property of the film surface. .

[0031]

Next, the present invention will be described more specifically with reference to examples. In addition, the raw materials used for the evaluation of the examples and comparative examples and the measuring methods are as follows.

1. Raw materials (1) Nylon 6 (N6); Unitika A1030B
RF (2) MXD6: MX nylon 600 manufactured by Mitsubishi Gas Chemical Company
7 (relative viscosity 2.64) (3) PBT-1; 194 parts of dimethyl terephthalate,
108 parts of 1,4-butanediol and 80 ppm of tetrabutyl titanate (a value converted into the weight of titanium metal with respect to the polymer) were added, and 2.5 to 150 ° C. to 210 ° C.
Transesterification was performed for hours. The obtained transesterification reaction product was transferred to a polymerization vessel to start decompression, and finally melt-polymerized at a pressure of 4 hPa at a temperature of 210 to 245 ° C. for 2 hours to obtain PBT-1. (4) PBT-2: 194 parts of dimethyl terephthalate,
108 parts of 1,4-butanediol and 80 ppm of tetrabutyl titanate (a value converted into the weight of titanium metal with respect to the polymer) were added, and 2.5 to 150 ° C. to 210 ° C.
Transesterification was performed for hours. The obtained transesterification product was transferred to a polymerization vessel, and after adding 40 ppm of tetrabutyl titanate, 15% by mass of polytetramethylene glycol (PTMG) having a molecular weight of 1100 was added, and the pressure was reduced. Under reduced pressure, temperature 210
PBT-2 was obtained by melt polymerization at ２245 ° C. for 2 hours. (5) Talc (TL); UPNHS-T0.
5 (6) Amorphous polyamide (AN); Grivory G21 manufactured by EMS (copolymer of hexamethylenediamine, terephthalic acid and isophthalic acid)

2. Measurement method (1) Tensile strength, elongation ASTM-D using a sample with a width of 10 mm and a length of 10 cm
882. (2) Hot water shrinkage A sample having a width of 10 mm and a length of 10 cm was immersed in boiling water for 30 minutes, the dimensional change before and after the treatment was measured, and the percentage relative to the original length was determined. (3) Haze Tokyo Denshoku Co., Ltd. fully automatic haze meter (TC-H3DPK)
Was measured in accordance with JIS K-6714. Haze (%) = [Td (diffuse transmittance%) / Tt (total light transmittance%)] × 100 (4) Pinhole resistance Fed. Test M
method Std. Method 201 of 101C
In accordance with No. 7, a 12 inch × 8 inch sample was collected with a diameter of 3.
5 inch cylindrical shape, grip both ends, initial grip interval 7
The number of pinholes generated after bending 1000 times at 5 ° C. with a so-called gel botester (manufactured by Rigaku Kogyo Co., Ltd.) was counted at a speed of 40 times / minute with the grip interval at the time of inch and the maximum bending being 1 inch. . (5) Oxygen permeability OX-TRAN1 manufactured by Modern Control
The measurement was performed under the conditions of 20 ° C. and 85% RH using 0-50A. (Unit: ml / (m ² · d ・ MPa)) (6) Delamination strength After peeling off the end of the multilayer film having a width of 15 mm at the interface, 2
The peeling strength was measured by a T-peel method at a peeling speed of 300 mm / min in an atmosphere of 0 ° C. and 65% RH using an autograph manufactured by Shimadzu Corporation. (7) Moisture content About 20 g of an unstretched multilayer sheet impregnated in a hot water bath is sampled in a weighing bottle and precisely weighed. Next, in a constant temperature dryer at 120 ± 2 ° C.,
After drying for an hour, the weight after cooling slowly to room temperature in a calcium chloride desiccator was precisely weighed, and the weight loss rate (%) was determined. (8) Hot water treatment resistance Unstretched polypropylene (Toray's Tolephan ZK-93K, 6
After laminating 0 μm 2), three-way heat sealing was performed to produce a rectangular filled bag measuring 14 cm long × 12 cm wide. Next, the bag was filled with 50 ml of water, the remaining one was heat-sealed, and the bag was subjected to a hot water treatment at 120 ° C. for 30 minutes, and the appearance of the bag was visually observed. Was evaluated in three steps. A: good B: only a small part (5% or less of the surface area of the filling bag) has poor appearance. C: Appearance failure is observed partially (5% or more of the surface area of the filling bag) or over the entire surface.

Example 1 A mixture of 30 parts by mass of N6 and 70 parts by mass of MXD6 was melt-extruded at an extrusion temperature of 300 ° C. using a twin screw extruder PCM45 manufactured by Ikegai Co., Ltd., and then pelletized. The obtained pellet was dried at 140 ° C. for about 2 hours and crystallized. Using a three-type, five-layer coextrusion T-die, N6 was heated from the extruder (A) at a temperature of 250 ° C. (Y layer), and MX was extruded from the extruder (B).
D6 and PBT-1 were obtained by dividing MXD6 / PBT-1 = 95/5.
(Mass%) talc 0.2% by mass
Was mixed at a temperature of 265 ° C. (X layer), and N6 and MXD6 were converted to N6 / MXD6 = 30/7 by an extruder (C).
The resin mixed at a ratio of 0 (% by mass) was melt-extruded at a temperature of 280 ° C. (Z layer), and a sheet laminated in the order of Y / Z / X / Z / Y was extruded from a die to obtain a surface temperature of 1
It is quenched by closely contacting it on a cooling drum controlled to 8 ° C., and the thickness of each layer is Y / Z / X / Z / Y = 45/5/50/5/4.
At 5 (μm), an unstretched multilayer sheet having a total thickness of 150 μm was obtained. The obtained sheet was sent to a hot water tank whose temperature was controlled at 60 ° C., and subjected to a soaking treatment for 1.5 minutes to adjust the water content to 4.7%. The end of this sheet is gripped with a clip of a tenter-type simultaneous biaxial stretching machine, preheated at 175 ° C., and then subjected to simultaneous biaxial stretching at a stretching temperature of 190 ° C., a stretching ratio of 3.0 times vertically and 3.3 times horizontally. After that, the relaxation rate in the lateral direction was set to 5%,
After a heat treatment at 10 ° C. for 4 seconds, the film is cooled and wound up, and the thickness of each layer is Y / Z / X / Z / Y, respectively.
= 4.5 / 0.5 / 5.0 / 0.5 / 4.5 (μm) to obtain a 15 μm thick multilayer stretched film. Next, the obtained raw roll was slit, and the results of evaluating various film properties are shown in Table 1. As shown in Table 1, the number of generated pinholes was small, the transparency and the oxygen barrier property were good, and the film had good suitability as a packaging film.

Examples 2 to 9 and Comparative Examples 1 to 3 Table 1 shows the types and amounts of PBT added to the X layer and the amounts of polyamides (A), (B) and (C) used for the Z layer. A multilayer stretched film was produced in the same manner as in Example 1, except that the film was changed as shown in Table 1. Table 1 shows the results obtained by measuring various film properties.

[0036]

[Table 1]

[0037]

The multilayer stretched polyamide film of the present invention has excellent transparency, tensile strength, delamination strength, gas barrier properties and dimensional stability, and is suitable for packaging applications having excellent retort resistance. It is provided and its industrial value is extremely high.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 67:02) C08L 67:02) B29K 77:00 B29K 77:00 B29L 9:00 B29L 9:00 ( 72) Inventor Kazunari Nanjo 31-3 Uji Hinojiri, Uji City, Kyoto Prefecture Unitika Co., Ltd. Uji Plastic Factory F-term (reference) 4F100 AC10A AK42A AK42J AK46A AK46C AK46D AK48B AK48C AK48D AK48E AL01A AL05A AL06A BA02 BA03 BA10 BA15 EH20 EJ37 EJ39 GB15 JA12C JA12D JD02 JD03 JD08 JK02 JK06 JL04 JN01 YY00 4F210 AA25 AA29 AB16 AG01 AG03 AH54 QA02 QC07 QD21 QG01 QG15 QG18 QL02 QW07 4J002 CF00 CF072 CL031

Claims (7)

[Claims] 1. At least one layer contains 99 to 75% by mass of a polyamide (A) mainly formed of a xylylenediamine component and an aliphatic dicarboxylic acid component having 4 to 12 carbon atoms, and polybutylene terephthalate or polybutylene terephthalate. The multilayer stretched polyamide film which has the resin layer (X) which consists of a polyester whose main component is 1-25 mass%. 2. The multilayer stretched polyamide film according to claim 1, comprising at least two layers of a resin layer (X) and a resin layer (Y) composed of an aliphatic polyamide (B). 3. An intermediate portion between the resin layer (X) and the resin layer (Y),
The polyamide (A) and / or the amorphous polyamide (C) are 50 to 80% by mass, and the polyamide (B) is 50% by mass.
3. The multilayer stretched polyamide film according to claim 1, comprising at least three layers having a polyamide resin layer (Z) having a ratio of ２０20% by mass. 4. 4. The multilayer stretched polyamide film according to claim 1, wherein the polyester is a modified polybutylene terephthalate obtained by copolymerizing polytetramethylene glycol as a diol component. 5. The resin layer (X) is coated with talc in an amount of 0.01 to 0.1.
The multilayer stretched polyamide film according to any one of claims 1 to 4, which contains 5% by mass. 6. The multilayer stretched film according to claim 1, wherein the multilayer stretched film is Y / Z / X / Z /
The multilayer stretched polyamide film according to any one of claims 1 to 5, comprising five layers of Y. 7. An oxygen transmission rate of 100 ml / (m ² · d ·
The multilayer stretched polyamide film according to any one of claims 1 to 6, which does not exceed MPa).