JPH0977945A - Thermoplastic resin composition and its use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermoplastic resin compsn. excellent in combination of gass barrier properties, impact resistance, pinholing resistance, stretchability, drawability, transparency, heat stability, etc. SOLUTION: This thermoplastic resin compsn. comprises 100 pts.wt. resin component comprising (A) 50-85 pts.wt. ethylene/vinyl alcohol copolymer, (B) 10-40 pts.wt. ionomer of an ethylene/unsatd. carboxylic acid copolymer having an unsatd. carboxylic acid unit content of 4 to 15mol%, and (C) 1-25 pts.wt. polyamide, and 0.01-3 pts.wt. metal salt of a fatty acid blended therewith.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a gas barrier property,
Impact resistance, pinhole resistance, stretchability, drawability, transparency,
TECHNICAL FIELD The present invention relates to a thermoplastic resin composition excellent in thermal stability and the like and its use.

[0002]

2. Description of the Related Art Ethylene / vinyl alcohol copolymers having a high vinyl alcohol content are widely used as food packaging materials because of their excellent transparency and gas barrier properties. However, since the copolymer is poor in flexibility, workability, spreadability, etc., it is rarely used as a monolayer film. For example, when this copolymer is formed into a film by an inflation method, there are drawbacks in that vertical wrinkles are likely to occur before and after the pinch roll, and the allowable range of molding conditions for obtaining a satisfactory product is narrow. Further, when the film is repeatedly bent or otherwise deformed, a pin pole is likely to be formed. Such a drawback can be improved by blending an ethylene polymer having excellent flexibility and processability,
In many cases, the transparency of the ethylene / vinyl alcohol copolymer is greatly impaired, and it has not been widely adopted.

For example, JP-A-49-107351 discloses that flexibility is improved by blending an ionomer with an ethylene / vinyl alcohol copolymer. Since the purpose of this proposal is to improve the adhesion of the copolymer to polyolefin, it discloses a technique of further blending a considerable amount of polyamide. In this proposal, no consideration is given to transparency and no mention is made of the composition of the ionomer.

Similarly, an invention focusing on the adhesiveness with a polyolefin is disclosed in Japanese Patent Application Laid-Open No. 50-103582, and the same composition and polyolefin are used except that the polyamide content is smaller than that of the previous proposal. Discloses a laminated container. Similarly, no consideration is given to transparency, and zinc ionomers and sodium ionomers can be used as ionomers, but details thereof are not disclosed. Specifically, only an example using Surlyn 1652 is shown.

The applicant of Japanese Patent Application No. 6-310239 discloses that when an ethylene / vinyl alcohol copolymer is blended with an ionomer, flexibility and processability are improved but transparency is significantly impaired. 50-50358
As shown as a specific example in Japanese Patent Publication No. 2), even in a system in which Surlyn 1652 and a polyamide are mixed with an ethylene / vinyl alcohol copolymer, flexibility and processability are improved but transparency is remarkably impaired. In addition to clarifying the above, the ethylene / vinyl alcohol copolymer has the above-mentioned drawbacks, and the ethylene / vinyl alcohol copolymer having a high unsaturated carboxylic acid content is used as a formulation which does not impair the transparency so much.
We proposed a method to mix the ionomer of unsaturated carboxylic acid copolymer and polyamide in a specified amount.

Further detailed examination of the melt molding of this composition revealed that when the molding temperature was set high, or when this composition stayed in a part of the molding equipment and was kept at a high temperature for a long time, It has been found that there are drawbacks such as the formation of pearls or coloring.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present inventors
Studies were conducted to improve the thermal stability of the composition of this prior application. As a result, they have found that a formulation in which a fatty acid metal salt is added is effective, and reached the present invention.

That is, the object of the present invention is to provide a gas barrier property,
Impact resistance, pinhole resistance, stretchability, drawability, transparency,
It is intended to provide a thermoplastic resin composition excellent in a combination of thermal stability and the like and its use.

[0009]

MEANS FOR SOLVING THE PROBLEMS The present invention relates to an ethylene / unsaturated carboxylic acid copolymer having 50 to 85 parts by weight of an ethylene / vinyl alcohol copolymer (A) and an unsaturated carboxylic acid content of 4 to 15 mol%. Combined ionomer (B) 10-40
0.01 parts by weight of a fatty acid metal salt to 100 parts by weight of a resin component consisting of 1 part by weight and 1 to 25 parts by weight of polyamide (C).
To 3 parts by weight of the thermoplastic resin composition.

The present invention also relates to a packaging material comprising at least one layer composed of the above thermoplastic resin composition.

The resin composition of the present invention comprises 50 to 85 parts by weight of an ethylene / vinyl alcohol copolymer (A) and an ethylene / unsaturated carboxylic acid copolymer having an unsaturated carboxylic acid content of 4 to 15 mol%. Consisting of 10 to 40 parts by weight of ionomer (B) and 1 to 25 parts by weight of polyamide (C),
To 100 parts by weight of this resin component, a fatty acid metal salt was added in an amount of 0.
The feature is that it is blended in an amount of 0.01 to 3 parts by weight.

That is, by blending the ethylene / vinyl alcohol copolymer (A) with the above resin components (B) and (C), excellent gas barrier properties and transparency of the ethylene / vinyl alcohol copolymer can be obtained. The flexibility, impact resistance, workability, pinhole resistance, deep drawability, etc. can be improved without significantly lowering it, and by incorporating a fatty acid metal salt, the heat resistance of this composition is significantly improved. Can be improved.

As shown in the examples described below, the composition comprising the above resin components (A), (B) and (C) shows a marked increase in torque during melt kneading (see Comparative Example 1), but according to the present invention. When a fatty acid metal salt is blended, an increase in torque can be effectively suppressed (see Examples 1 to 4).

The cause of this increase in torque is considered to be that crosslinking of the polymer component occurs through thermal deterioration (thermal degradation, abstraction of hydrogen or hydroxyl groups) of the polymer component during melt-kneading of the resin composition. However, it is speculated that the fatty acid metal salt used in the present invention suppresses the torque increase by reducing the friction between the polymers or between the polymer and the vessel wall, and at the same time exhibiting a heat stabilizing action. .

It is particularly important for the ionomer used in the present invention that the unsaturated carboxylic acid content is in the range of 4 to 15 mol% in order to maintain excellent transparency and improve impact resistance. . When the unsaturated carboxylic acid content is lower than the above range, the transparency and impact resistance tend to decrease (see Reference Comparative Examples 1 and 2 described later), and when the unsaturated carboxylic acid content becomes too high, Impact resistance tends to decrease.

On the other hand, the polyamide used in the present invention is a component for compatibilizing the ethylene / vinyl alcohol copolymer and the ionomer, and the combination of the ionomer and the polyamide reduces the optical properties such as transparency. It is possible to improve flexibility, impact resistance, workability, etc. without performing the above.

That is, when the ethylene / vinyl alcohol copolymer is blended with the ionomer alone (see Reference Comparative Example 6 described later), the transparency and impact resistance are largely lowered as compared with the unblended one. Further, when polyamide alone is blended (see Reference Comparative Example 7 described later), impact resistance and workability are hardly improved, but by blending both in combination (see Reference Examples 1 to 9 described later). ), The mechanical properties and workability can be remarkably improved without significantly reducing the transparency.

In the present invention, 50 to 85 parts by weight of ethylene / vinyl alcohol copolymer and 10 to 4 of ionomer are used.
It is also important to use 0 parts by weight and 1 to 25 parts by weight of polyamide, and when the amount of the ionomer used is less than the above range (see Reference Comparative Example 3 described later), impact resistance and workability Is insufficient, and on the other hand, when it is more than the above range (see Reference Comparative Example 4 described later), the gas permeation resistance decreases. When the amount of polyamide used is less than the above range (see Reference Comparative Example 3 or 6 described later), the impact resistance is lowered, while when it is more than the above range (see Reference Comparative Example 5 described below). In addition to the difficulty in processing the composition, it also has the drawback of poor thermal stability.

According to the present invention, as described above, by mixing a specific ionomer and a polyamide in a predetermined amount in an ethylene / vinyl alcohol copolymer, excellent gas barrier properties, transparency, etc. possessed by the copolymer can be obtained. Impact resistance, flexibility, workability, pinhole resistance, without sacrificing
The deep drawability and the like can be improved, and the thermal stability can be improved by incorporating a predetermined amount of the fatty acid metal salt.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The ethylene / vinyl alcohol copolymer (A) used in the present invention has a vinyl alcohol content of 40 to 85 mol%, preferably 50 to 75 mol%. The monomer may be contained as long as it is about 10 mol% or less. The best way to obtain such a copolymer is to saponify an ethylene / vinyl acetate copolymer having a vinyl acetate content of 40 to 85 mol%, preferably 50 to 75 mol%, of 95% or more, preferably 98% or more. It is a method of performing saponification so that the frequency is constant. When the vinyl alcohol content in the copolymer exceeds the above range,
It is not preferable because heat resistance and processability are deteriorated, and when it is less than the above range, gas barrier property is deteriorated. As the ethylene / vinyl alcohol copolymer, 210
C. and a melt flow rate at a load of 2160 g of 0.
It is preferable to use one having an amount of 5 to 50 g / 10 minutes, particularly 1 to 20 g / 10 minutes.

The ionomer (B) used in the present invention
Considering the transparency of the composition, the unsaturated carboxylic acid content of the base ethylene / unsaturated carboxylic acid copolymer is 4 to 15 mol%, preferably 5 to 12 mol%, more preferably 6 to It is 10 mol%. When the unsaturated carboxylic acid content is less than the above range, it is difficult to obtain a composition having excellent transparency and impact resistance. The higher the unsaturated carboxylic acid content, the more transparent the composition tends to be, but the impact resistance may be slightly reduced. Therefore, it is recommended to use the acid content as described above. preferable. In such a copolymer, 12 mol%
Below, it may be a copolymer of another monomer, preferably about 8 mol% or less.

Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, monomethyl maleate, monoethyl maleate, maleic anhydride and the like, with acrylic acid or methacrylic acid being particularly preferred. Other monomers that may be contained in the copolymer include vinyl acetate, vinyl esters such as vinyl propionate, methyl acrylate, ethyl acrylate, isopropyl acrylate, isobutyl acrylate, and acrylic acid n. Butyl, 2-ethylhexyl acrylate, methyl methacrylate, isobutyl methacrylate,
Unsaturated carboxylic acid esters such as diethyl maleate, carbon monoxide and the like.

The metal ion in the ionomer is an alkali metal such as lithium, sodium or potassium, or an alkaline earth metal such as zinc, magnesium or calcium. In particular, when zinc is used, it has excellent transparency and impact resistance. Well-balanced and preferable. The degree of neutralization in the ionomer is preferably 5 to 100%, particularly 10 to 90%, and particularly 30 to 70%. The ionomer also has a melt flow rate of 0.05 to 50 g / 10 minutes, particularly 0.
It is preferable to use the one having 5 to 5 g / 10 minutes.

The polyamide (C) used in the present invention is, for example, nylon 6, nylon 66, nylon 61.
0, nylon 612, nylon 11, nylon 12, nylon 6/66 copolymer, nylon 6/12 copolymer,
Nylon 66.12 Copolymer, Nylon 6.610 Copolymer, Nylon 66.610 Copolymer, Nylon 6.6
T and the like can be exemplified. These may have a molecular weight such that they can be formed into a film. Among these, it is preferable to use one having a melting point of 240 ° C. or lower, particularly 160 to 230 ° C. That is, when the melting point of the polyamide becomes too high, it becomes necessary to raise the molding temperature, and as a result, the possibility of increasing the thermal deterioration of the composition increases. The use of copolyamide is effective in keeping the melting point low.

In the present invention, when the total amount of the ethylene / vinyl alcohol copolymer (A), the ionomer (B) and the polyamide (C) is 100 parts by weight, the ethylene / vinyl alcohol copolymer (A) is used. But 50-85
Parts by weight, preferably 60 to 80 parts by weight, ionomer (B) at 10 to 40 parts by weight, preferably 15 to 35 parts by weight, polyamide (C) at 1 to 25 parts by weight, preferably 3 to 15 parts by weight. is there. When the proportion of the ionomer used is less than the above range, the effect of improving the flexibility and pinhole resistance is small, while when the blending amount is more than the above range, the decrease in gas barrier property cannot be ignored, which is not preferable. Polyamide acts as a compatibilizing agent between the ethylene / vinyl alcohol copolymer and the ionomer and minimizes the decrease in transparency, but if used in a too large amount, it impairs the moldability and thermal stability of the composition. So
25 parts by weight or less.

In the present invention, (A), (B),
By blending 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, of a fatty acid metal salt with 100 parts by weight of the resin component comprising (C), the thermal stability of the resin composition is significantly improved. To be done.

The fatty acid metal salt has 12 to 2 carbon atoms.
A metal salt of a fatty acid of about 4, especially about 16 to 20, for example, a salt of an alkali metal, an alkaline earth metal, zinc or the like is preferably used. More specifically, one or more salts of salts such as palmitic acid, stearic acid, oleic acid, behenic acid, erucic acid and hydroxystearic acid such as sodium, potassium, calcium, magnesium and zinc are used. Most preferable is calcium stearate, which is inexpensive and has a high addition effect.

If desired, various other additives may be added to the composition of the present invention. Examples of such additives include phenolic antioxidants, phosphorus stabilizers, weathering stabilizers, antistatic agents, lubricants, antiblocking agents, and the like. The composition of the present invention can also be blended with other polymers within a range that does not impair the properties.

The composition of the present invention can be easily obtained by melt-kneading the components with a usual melt-kneading device. In order to obtain a molded article of the composition of the present invention, each component can be dry blended, melt-kneaded and directly molded. However, in the case of insufficient kneading, transparency and other physical properties may be impaired, so if the composition is melt-kneaded in advance into pellets and used in various moldings, molded articles with stable properties are obtained. It is possible because it is possible.

The composition of the present invention can be used for various packaging materials by taking advantage of the above-mentioned characteristics. Such packaging materials can be used in the form of films (unstretched films, shrink films, etc.), sheets, cups, trays, bottles, tubes, cans, paper cartons, bag-in-boxes and the like. These molded products can be easily manufactured by known molding methods such as extrusion molding, injection molding, blow molding, and pressure molding. The molding temperature is usually 190 to 240 ° C., and preferably 200 to 230 ° C., although it depends on the raw materials used.

Such a molded article may be composed of only the composition of the present invention, or may have a multilayer structure of two or more layers with other various base materials. Other substrates that can be laminated include, for example, polyethylene, polypropylene,
Polyolefins such as poly-1-butene and poly-4-methyl-1-pentene, ethylene / vinyl acetate copolymer, ethylene / (meth) acrylic acid ester copolymer,
Ethylene / (meth) acrylic acid copolymer or its ionomer, ethylene / (meth) acrylic acid / (meth)
Acrylic ester copolymer or its ionomer, ethylene copolymers such as ethylene / (meth) acrylic acid ester / maleic anhydride copolymer, polyamide, polyester, polyvinyl chloride, polyvinylidene chloride, polystyrene, paper, An aluminum foil, an aluminum vapor deposition film, etc. can be illustrated. Among these,
A laminated packaging material with a base material having at least one layer of an olefin polymer such as the above polyolefins and ethylene copolymers is particularly useful. When laminating the olefin polymer, a part or all of the olefin polymer may be preliminarily graft-modified with an adhesion-imparting monomer such as maleic anhydride, and such a graft-modified olefin polymer may be used in the adhesive layer. It may be used to laminate an unmodified olefin polymer. A laminate in which the resin composition of the present invention is sandwiched between a moisture-resistant resin such as an olefin resin as an inner layer and an outer layer, and the adverse effect (reduction of gas barrier property) due to moisture absorption of the resin composition is avoided. It is particularly promising because it can.

More specifically, the composition of the present invention is C, the olefin polymer is PO, the modified olefin polymer is modified PO, polyamide is PA, polyethylene terephthalate is PET, polystyrene is PS, and polyvinyl chloride is P.
When displayed as VC, PO / C, PO / modified PO / C, PO / C / PO, PO / modified PO / C / modified PO / PO, PET / C / PET, PS / C / PS, P
O / PA / C, PO / C / PA / PO, PO / paper / PO
A laminated structure such as / C / PO can be used.

[0033]

EXAMPLES The effects of the present invention will be described below with reference to examples. The raw materials used in the present invention are shown in Table 1.

[0034]

[Table 1]

Examples 1 to 4, Comparative Example 1 Labo Plastomill (100 ml capacity) manufactured by Toyo Seiki Co., Ltd.
In addition, ethylene-vinyl alcohol copolymer (EVO
H), an ionomer of an ethylene / methacrylic acid random copolymer (ionomer), nylon, calcium stearate, and an antioxidant are added in a composition shown in Table 2, under a dry nitrogen atmosphere, a block temperature of 240 ° C., and a rotor rotation speed. The thermal stability of the resin composition was evaluated by kneading at 60 rpm for 60 minutes and examining the change with time of torque.

[0036]

[Table 2]

The results are shown in Table 2. In Example 1-4 in which 0.1-1.0 parts by weight of calcium stearate was added, the increase in torque was significantly reduced as compared with Comparative Example 1 in which calcium stearate was not added. It is presumed that calcium stearate has an effect of suppressing thermal crosslinking and thermal deterioration of the resin composition, and the thermal stability of the resin composition is improved.

In order to show the criticality of the compounding ratio of each resin component in the resin composition of the present invention, the following reference examples and reference comparative examples are shown. First, a method for preparing a resin composition, a film processing method, and a film physical property evaluation method will be described below.

(1) Method for preparing resin composition Each resin composition shown in Tables 3 and 4 was blended according to the composition ratio shown in Table 5. The blending method includes a method in which the resin pellets are uniformly mixed in a solid state with a blender or the like under normal temperature (hereinafter referred to as a dry blend), or each resin is heated and kneaded and mixed using a single screw kneader. While extruding and pelletizing (hereinafter referred to as melt blending). The resin extrusion conditions for the melt blending are as follows. Extruder diameter: 40 mmφ, resin temperature: 230 ° C, resin extrusion rate: 10 kg / hr

(2) Film processing method Each composition blended by the above method (1) was prepared by an inflation film processing method with an extruder bore diameter of 30 mm or 50 mm. The inflation process was performed under the following conditions.・ Processing machine-1 30 mm diameter extruder, 50 mm diameter round die Processing resin temperature: 230 ° C, film thickness: 50 µm, film expansion ratio: 2.3, take-up speed: 3 m / min ・ Processing machine-2 50 mm diameter extruder, 150mm diameter round die processing resin temperature: 230 ° C, film thickness: 50μm, film expansion ratio: 2.4, take-up speed: 6m / min

(3) Evaluation Method of Physical Properties of Film Using the film prepared by the method of (2) above,
The following physical properties were measured according to each method and standard. The following evaluations were all carried out under the conditions of 23 ° C. and 50% relative temperature atmosphere, and the measurement results are summarized in Table 5. Measurement item Measurement method / standard Optical haze (cloudiness) JIS K-6714 Gloss (gloss) JIS Z-8471 Transformer (light transmissivity) ASTM D-1709 Oxygen permeability JIS Z-1707 Film impact Constant horizontal area Attach a 0.6 inch diameter anti-ball to the center of the circular film and measure the force when the film breaks. (Device used: Film Impact Tester, Toyo Seiki Co., Ltd.) Pinhole resistance The number of pinholes when the film is bent a predetermined number of times under the conditions of a twist angle of 440 degrees and a stroke of 152.4 mm are measured. (Equipment used: Toyo Seiki Co., Ltd. Gelbo flex measuring machine) Vacuum deep drawing processability Omori Kasei Co., Ltd. vacuum deep drawing tester was used to evaluate melt drawability. Film heating time: 2 seconds, vacuum drawing time: 3 seconds Drawing depth: 60 mm, film heating temperature: 140 ° C. Modulus JIS K6301 JIS No. 1 Dumbbell punched out a film sample and elongation of 2% at a pulling speed of 300 mm / min. The stress in the longitudinal and transverse directions of the film when measured as a percentage is measured. (Used equipment: Shimadzu Universal Testing Machine)

Reference Example 1 and Reference Comparative Example 8 In Reference Example 1, various ionomers shown in Tables 3 and 4,
21% by weight of EVOH and polyamide, 70%
%, 9% composition ratio, the composition prepared by the melt blending method described in the resin composition preparation method of (1),
A film was prepared according to the film processing method (processing machine-1 condition) in (2). The optical properties (haze, gloss, transformer), oxygen permeability, film impact, vacuum deep drawing workability, and modulus were measured according to the film physical property evaluation method of (3). On the other hand, Reference Comparative Example 8
Then, the EVOH resin alone shown in Table 4 was evaluated in the same manner as in Reference Example 1 above. Table 5 shows the obtained results. As a result, the resin composition film of Reference Example 1 was compared with Reference Comparative Example 8
While showing almost the same optical characteristics and oxygen permeability as the EVOH single film, a significant improvement effect was recognized in film impact, vacuum deep drawing processability, and modulus (flexibility).

Reference Examples 3, 5, 6 and Reference Comparative Examples 1, 2 All compositions were evaluated by the same method as in Reference Example 1 except that the kind of the composition ionomer was changed as shown in Table 5. In Reference Examples 3, 5 and 6, the same improvement effects as in Reference Example 1 were observed, while in Reference Comparative Examples 1 and 2, the film optical characteristics or the film impact were poor.

Reference Examples 2 and 4 Reference Example 2 is exactly the same as Reference Example 1 and Reference Example 4 is exactly the same as Reference Example 3 except that each resin composition was prepared by the dry blending method. The film impact, oxygen permeability, vacuum deep-drawing processability, and modulus are similar to those in Reference Example 1, but the optical properties tend to be slightly worse than those prepared by the melt blending method.

Reference Example 7 The same as Reference Example 1 except that the resin composition ratios were changed as shown in Table 5.

[0046]

[Table 3]

[0047]

[Table 4]

Reference Comparative Examples 3 to 5 Each resin composition ratio was changed as shown in Table 5, and the same evaluation as in Reference Example 1 was carried out. When the amount of the ionomer and polyamide composition is too small relative to EVOH, melt stretchability and film impact are lowered as in Reference Comparative Example 3, and conversely, when the ratio of the ionomer and polyamide composition is increased, Reference Comparative Example When the film formability was lowered as shown in No. 5 and the film could not be processed, and the composition ratio of the ionomer and the polyamide was increased, the oxygen permeability was significantly increased as in Reference Comparative Example 4, resulting in an unfavorable result. .

Reference Comparative Example 6 Polyamide was excluded from the composition resin to obtain a two-component composition of EVOH and ionomer. As a result, the optical properties and the film impact were significantly reduced, which was an unfavorable result.

Reference Comparative Example 7 Ionomer was excluded from the composition resin to obtain a two-part composition of EVOH and polyamide. As a result, the film impact is reduced, the vacuum deep drawing processability is impossible, and the modulus is EV.
Increased over OH.

Reference Example 8 The same resin composition as in Reference Example 1 was used, and the extruder bore diameter was 50 m.
An inflation processing machine of m was used to prepare a film according to (2) Film processing method (processing machine-2).
Even when the extruder scale was large, the physical properties of the film were at the same level as in Reference Example 1, and good blown film processability and physical properties were observed.

Reference Example 9 The same resin composition as in Reference Example 2 was prepared in the same manner as in the film processing method of Reference Example 8. Even when the extruder scale was increased, the physical properties of the film showed the same level as in Reference Example 2, and good blown film processability was recognized.

Reference Comparative Example 9 For comparison, an EVOH resin shown in Table 4 was prepared by the same film processing method as in Reference Example 8 and various physical properties of the film were evaluated.

In Reference Examples 8 and 9 and Reference Comparative Example 9,
The pinhole resistance was measured according to the method described in the section (3) Evaluation method of physical properties of film. As a result, as compared with Reference Comparative Example 9, in Reference Examples 8 and 9, the number of pinhole-generated bends was significantly increased, and the effect of improving the pinhole resistance was confirmed.

[0055]

[Table 5]

[0056]

EFFECTS OF THE INVENTION According to the present invention, the ethylene / vinyl alcohol copolymer is blended with a specific amount of a specific ionomer and a polyamide, and also with a specific amount of a fatty acid metal salt, whereby the copolymer has excellent properties. Impact resistance, flexibility, workability, pinhole resistance, deep drawability, etc. are improved without sacrificing gas barrier properties, transparency, etc.
Moreover, it is possible to provide a composition having excellent thermal stability. The composition of the present invention can be formed into a film, a sheet, a container, etc. by various molding methods such as extrusion molding, injection molding, hollow molding, vacuum molding, and pressure molding, making use of such characteristics.

Claims (6)

[Claims] 1. An ethylene / vinyl alcohol copolymer (A) in an amount of 50 to 85 parts by weight and an unsaturated carboxylic acid content of 4
To 100 parts by weight of a resin component composed of 10 to 40 parts by weight of an ionomer (B) of an ethylene / unsaturated carboxylic acid copolymer of 1 to 15 mol% and 1 to 25 parts by weight of a polyamide (C), and a fatty acid metal salt of 0. 0.01 to 3 parts by weight of a thermoplastic resin composition. 2. The thermoplastic resin composition according to claim 1, wherein the ethylene / vinyl alcohol copolymer is an ethylene / vinyl alcohol copolymer having a vinyl alcohol content of 40 to 85 mol%. 3. The thermoplastic resin composition according to claim 1, wherein the polyamide is a polyamide or a copolyamide having a melting point of 240 ° C. or lower. 4. The thermoplastic resin according to claim 1, wherein the ionomer is an ionomer whose metal species is selected from zinc, alkali metal or alkaline earth metal and has a neutralization degree of 10 to 90%. Composition. 5. A packaging material comprising at least one layer comprising the thermoplastic resin composition according to any one of claims 1 to 4. 6. The packaging material according to claim 5, comprising at least one olefin polymer layer.