JP3489902B2 - Resin composition and multilayer structure using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition and a multilayer structure which are improved in processing suitability such as stretching and thermoforming or retort suitability without significantly deteriorating gas barrier properties.

[0002]

2. Description of the Related Art EVOH is today a barrier film for packaging foods, especially for oxygen, odor and flavor.
It has been recognized as effective in the fields where it is intended to be used for foods that need to maintain their properties and other products that need aroma retention. And EVOH is polyethylene, polypropylene, polystyrene, polyester, polyamide,
A thermoplastic resin layer such as polyvinyl chloride, an ionomer,
It is used in the form of a multilayer structure formed by laminating various adhesive resin layers represented by ethylene-vinyl acetate copolymer and the like.

By the way, when a multilayer structure (film, sheet, parison, etc.) manufactured by various methods is subjected to secondary processing such as stretching and thermoforming, small voids, cracks, local uneven thickness, etc. are formed in the EVOH layer. There are frequent problems. Therefore, conventionally, the pinhole of the EVOH layer generated at the time of heat drawing is used.
For the purpose of preventing cracks and cracks, various plasticizers are added to the EVOH layer (JP-A-53-88067, JP-A-59-59).
20345) and a blend of a polyamide resin (Japanese Patent Laid-Open No. Sho 5
2-141785, JP-A-58-36412) and the like have been studied, but it was found that in any case, the following points were not sufficiently satisfactory. That is, in a system in which various plasticizers are added, in order to sufficiently improve the heat-stretching property, the plasticizer is added in an amount of 10 parts by weight per 100 parts by weight of EVOH.
It is necessary to add 20 parts by weight to 20 parts by weight, and there are many problems such as a large decrease in gas barrier property and a decrease in interlayer adhesion strength with the EVOH layer, and it cannot be used.

In addition, the addition system of the polyamide resin cannot be used because of the large chemical reactivity with EVOH, the presence of a large number of gel-like substances in the molded product, and the remarkable coloring. In addition, in the addition system of the polyamide resin having a relatively small amount of gel coloring, the compatibility between EVOH and the polyamide is not sufficient, so that an apparently good container can be obtained. Probably because of the presence of pinholes, the measured values of the gas barrier properties were largely variable, and the container was not reliable as a gas barrier container, and could not be used.

On the other hand, in JP-A-5-320330, a compound obtained by graft-polymerizing an alkylene oxide onto an ethylene-vinyl alcohol copolymer is a mixture of resin and rubber,
In the molding process, it is described that it is effective as a mold release material for preventing resin adhesion and deterioration in molding equipment.
As shown in the present invention, the addition of ethylene oxide, which is substantially insoluble in water, to EVOH is effective as a modifier for improving secondary processing such as stretchability and thermoformability, or improving retort appropriateness. There is no description, and the idea is fundamentally different from the present invention. Further, the resin {internal release material (A)} described in Example 1 of JP-A-5-320330 has a poor gas barrier property and is unsuitable as a barrier packaging material.

[0006]

Therefore, the stretchability and thermoformability are good, and the high gas barrier property even after the retort treatment,
One of the important issues is the development of EVOH
INDUSTRIAL APPLICABILITY The present invention does not impair the excellent gas barrier property of EVOH, and cracks and pinholes in the EVOH layer that occur when the EVOH multilayer structure is secondarily processed into a container or the like.
EVOH that can prevent the occurrence of uneven thickness and local uneven thickness, and can maintain high gas barrier properties after water absorption such as retort treatment.
It is an object to provide a resin composition and a multilayer structure having the resin composition layer.

[0007]

Means for Solving the Problems The above object is to achieve an alkylene substantially insoluble in water with respect to 100 parts by weight of an ethylene-vinyl alcohol copolymer (A) having an ethylene content of 20 to 70 mol% and a saponification degree of 80% or more. It is achieved by providing a multilayer structure using a resin composition (C) and a layer (C) containing 0.1 to 100 parts by weight of an oxide compound (B).

In the present invention, EVOH (A) is a saponification product of an ethylene-vinyl acetate copolymer, which has an ethylene content of 20 to 70 mol%, preferably 22 to 60 mol%, and a vinyl acetate component. The degree of saponification is 80% or more,
Preferably, 85% or more can be used. When the ethylene content is less than 20 mol%, the melt moldability is poor, while when it is 70 mol% or more, the gas barrier property is insufficient. If the degree of saponification is less than 80%, gas barrier properties and thermal stability will be poor.

The EVOH is more preferable than the case where one or more blends of EVOH having different ethylene content, saponification degree and polymerization degree are blended. Then, as a method for obtaining an EVOH composition in which two or more kinds of EVOH are blended, a method of blending two or more kinds of EVOH having different ethylene contents or / and saponification degrees in a solution state or a molten state, Alternatively, two or more kinds of ethylene-vinyl acetate copolymers having different ethylene contents may be blended, or the ethylene-vinyl acetate copolymer composition obtained by changing the polymerization conditions may be saponified to have different ethylene contents or / and saponification degrees. There is a method of obtaining an EVOH composition containing two or more kinds of EVOH.

Further, the EVOH (A) is another comonomer [eg propylene, butylene, unsaturated carboxylic acid or its ester {(meth) acrylic acid, (meth ) Acrylic ester (methyl, ethyl), etc., vinylpyrrolidone (N-methyl-vinylpyrrolidone, etc.) vinylsilane compound (vinylmethoxysilane, etc.) are copolymerized, and a boron compound is added as a melt viscosity modifier. You can also do it. Melt index of EVOH {measured at 190 ° C under a load of 2160g: However, if the melting point is near 190 ° C or exceeds 190 ° C, it is measured at a plurality of temperatures above the melting point under a load of 2160g, and is the reciprocal of absolute temperature in a semilog graph. Is plotted on the abscissa and the melt index is plotted on the ordinate (logarithm).
It is preferably g / 10 minutes.

EVOH (A) includes plasticizers, hydrotalcite, higher fatty acid salts and other recovery agents, ultraviolet absorbers, antistatic agents, pigments, antioxidants, lubricants, slip agents, as long as they do not hinder the present invention. You may mix these. Polymers such as polyamide, super absorbent polymer, and polyolefin may be blended as long as they do not hinder the present invention.

The water-insoluble alkylene oxide compound used in the present invention is a polyalkylene glycol obtained by polymerizing an aliphatic oxide compound such as ethylene oxide, propylene oxide or butylene oxide in the presence of a catalyst such as an alkali. Resin produced by crosslinking with heat or electron beam or the like, or one or more of hydroxyl group, carbonyl group, anhydrous carbonyl group, silanol group, boron group, amino group, amide group, etc. when carrying out the polymerization. And polyfunctional compounds having 3 or more functional groups, or those obtained by adding a resin as a crosslinking agent. The crosslinked alkylene oxide resin does not substantially dissolve in water at 20 ° C. and exhibits a water absorption of 10% or more. However, if the crosslinking proceeds too much, the viscosity at the time of melting will greatly increase, and it will be necessary to perform high-temperature molding in order to reduce the viscosity, which causes problems such as thermal decomposition, gelation, and generation of seeds. Therefore, substantially 190 ° C. of insoluble alkylene oxide to water, melt index under a load of 2160g is Ru Oh <br/> at 0.1 to 100 g / 10 min. The term "substantially insoluble in water" as used herein means that the residue (dissolved residue) after evaporating the filtrate after being left in water at 20 ° C for 24 hours and filtered through a filter paper is the same as before immersion in water. 5 to weight
0% or less, preferably 30% or less, more preferably 20
% Means less than or equal to%. Here, the weight immediately before immersion in water means that the polymer is vacuumed (1 mmHg) at 100 ° C. for 24 hours.
It is the weight after drying under. Examples of the cross-linking agent include glycerin, diglycerin, triglycerin, polyglycerin, 1,3,5 tricarboxybenzene, 1,3,5 triaminobenzene, and 1,3,5 triaminophenol. , Diglycerin, triglycerin and polyglycerin are effective.

The blend weight ratio of EVOH (A) and alkylene oxide compound (B) is (B) / (A) =
0.1 / 100 to 100/100, more preferably 0.5
/ 100 to 50/100. If it is less than 0.1 / 100, there is no effect of improving the moldability, while if it is 100/100 or more, the barrier properties are not sufficient. Further, the water absorption of the resin composition (C) at 20 ° C. desirably satisfies the following formula (I). C (w)> 14-{(X-32) / 3} ... (I) where C (w) is the water absorption rate (%) of the composition (C) at 20 ° C. X is EVOH ( Ethylene content of A) (mol%) Here, the "water absorption rate" is the% of the weight (a) left in water at 20 ° C for 24 hours with respect to the weight before immersion in water (b), that is, C (w). = (A / b) X100. Here, the weight immediately before immersion in water means the polymer at 100 ° C., 24
Weight after drying under vacuum (1 mmHg) for time.

The blending method of EVOH (A) and alkylene oxide compound (B) is not particularly limited, but known methods such as a Banbury mixer method and a melt blending method using a single-screw or twin-screw extruder are known. The method can be adopted. Further, during this blending, other additives such as an antioxidant, an ultraviolet absorber, a lubricant, a plasticizer, an antistatic agent, a colorant and the like can be added within a range where the effects of the present invention are not impaired.

By laminating the thermoplastic polymer layer on at least one side of the above-mentioned resin composition (C) layer, a multilayer structure which is a preferred embodiment can be obtained. Here, the thermoplastic polymer is not particularly limited as long as it improves the moisture resistance and mechanical properties of the resin composition layer, but is not limited to polyolefin (polyethylene (high, medium, low density polyethylene, linear chain Low density polyethylene), ethylene-propylene copolymer, polypropylene (PP), etc.}, ionomer (IO), ethylene-vinyl acetate copolymer (EV
A), ethylene-acrylic acid copolymer (EAA), ethylene-acrylic acid ester copolymer (EEA), polystyrene (PS), and further polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polyamide, polycarbonate. , Polyvinyl chloride, polyvinylidene chloride, polyurethane, polyacetal, polyketone composed of carbon monoxide-ethylene copolymer, polyalcohol obtained by reducing the polyketone, and the like. Further, the kind of the thermoplastic polymer is appropriately selected depending on the required properties and application.

The multi-layer structure is formed by a known method such as coextrusion, co-injection, extrusion coating, and scraps of these molded products can be reused. When scraps are reused, the present invention can be used. Incorporating the resin composition into scrap, or the component (A) used in the present invention
Alternatively, the component (B) can be blended in the scrap.

When a multilayer structure is obtained, it is often preferable to interpose an adhesive resin layer between the composition (C) layer of the present invention and the thermoplastic resin layer because both layers can be firmly adhered. The adhesive resin is not particularly limited as long as it can firmly bond both layers, but an unsaturated carboxylic acid or its anhydride (maleic anhydride, etc.) is used as an olefin polymer or copolymer. Polymer [Polyethylene {Low density polyethylene, Linear low density polyethylene (LLDPE), Ultra low density polyethylene (SLDP
E)}, ethylene-vinyl acetate copolymer, ethylene-
(Meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester (methyl ester or ethyl ester) copolymer, polypropylene, etc.) grafted, hydrogenated styrene-butadiene copolymer acid anhydride (anhydrous Maleic acid) modified products, acid anhydride modified products of liquid butadiene, acid anhydride modified products of ethylene-propylene-diene copolymers and the like, and diene polymer acid anhydride modified products and the like are preferably used.

The layer structure of the multilayer structure is as follows: resin composition (C) layer / thermoplastic resin layer, resin composition (C) layer / thermoplastic resin layer / resin composition (C) layer, thermoplastic resin layer / Resin composition (C) layer / thermoplastic resin layer, thermoplastic resin layer /
Resin composition (C) layer / scrap recovery layer / thermoplastic resin layer, thermoplastic resin layer / scrap recovery layer / resin composition (C) layer / scrap recovery layer / thermoplastic resin layer, or at least one of these layers An example is one in which the above-mentioned adhesive resin layer is interposed between two layers.

The multilayer structure obtained from the above-mentioned resin composition of the present invention is a food, medicine, medical equipment, clothing requiring stretchability, thermoformability, pinhole resistance, retort property, gas barrier property and the like. In packaging materials, such as gas barrier properties and mechanical strength, particularly in non-food fields such as pipes and tanks that require impact resistance, or moisture resistance and gas barrier properties that effectively utilize the high hygroscopicity of the composition. It is useful for surface protection of electronic parts and electroluminescent parts that are required to, and packaging materials.

[0020]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In the following Synthesis Examples and Examples, "%" means "% by weight" unless otherwise specified.

Example 1 EV having an ethylene content of 32 mol%, a saponification degree of 99.5 mol% and a melt index value (190 ° C.) of 1.3 g / 10 min.
Glycerin as a crosslinking aid in 100 parts by weight of OH (A),
Polymerized ethylene oxide with potassium hydroxide (KOH) as a catalyst, it is practically insoluble in water at 20 ° C (dissolved residue 5%), water absorption at 20 ° C is 40%, melt index value (190 ° C, 2160g). ) Is mixed with 10 parts by weight of an alkylene oxide resin (B) having a concentration of 1.5 g / 10 min,
Pelletization was performed under the following conditions. 2 of the composition obtained
The water absorption at 0 ° C was 18%. Extruder used: Segment type lab twin screw extruder (25
mm diameter) Screw shape: C type (strong kneading type) Screw rotation speed: 230 rpm Discharge rate: 0.6 Kg / h

The composition (C) was applied to a three-kind five-layer coextrusion machine to prepare a multilayer sheet {polystyrene resin layer, adhesive resin layer / composition (C) layer / adhesive resin layer / polystyrene resin layer}. Created. The structure of the sheet is 800 for both outermost polystyrene resin layers (Asahi Dow Styron 691).
μ, adhesive resin layer (Toso- “Mersen M-542
0 ", maleic acid-modified ethylene-vinyl acetate copolymer)
Is 50 μm, and the intermediate layer (C layer) is 50 μm. The sheet was molded at 130 ° C. in a vacuum pressure air thermoforming machine. As a result, the molded product was free from cracks, unevenness, uneven thickness, and had good appearance and transparency. 2 this container
When the humidity was adjusted to 0 ° C.-65% RH and the oxygen permeability was measured (10/50 type manufactured by Mocon Co.), 0.9 cc. 20μ /
m ² . 24 hr. Not only does it show a very good gas barrier property with atm, but the variation in the measured values when 20 samples are measured (R = maximum oxygen permeability value-minimum oxygen permeability value) is very small at 0.3. It was a highly reliable container with high gas barrier properties.

Further, scraps and trims produced during thermoforming are crushed and applied to a 4-kind 7-layer coextrusion device to obtain a multilayer sheet {polystyrene resin layer / collection layer / adhesive resin layer / composition (C).
Layer / adhesive resin layer / collection layer / polystyrene resin layer}. The structure of the sheet is such that the outermost polystyrene resin layer is 200μ, the recovery layer is 600μ, and the adhesive resin layer is 100μ.
μ, and the intermediate layer (C layer) is 50 μ. The sheet moldability and thermoformability of the sheet were good, and the drop bag rupture strength of the container was not significantly different from that of the product not using the recovery layer.

Comparative Example 1 The same as Example 1 except that EVOH (A) having an ethylene content of 32 mol% and a saponification degree of 99.5% was used in place of the composition (C) used in Example 1. A multi-layered container was obtained as described above, but the container was unsatisfactory because of cracks, unevenness and uneven thickness. As a result of microscopic observation, numerous minute voids were found in the EVOH layer. This container is 20 ℃ -65% RH
When the gas barrier property was measured (10/50 type, manufactured by Mocon Co.), the oxygen permeability was 5.5 cc. 20 μ / m
² ． 24 hr. The atm and gas barrier properties were poor.

Further, in the same manner as in Example 1, in the four-type seven-layer coextrusion sheet molding, the appearance of the multilayer sheet was wavy, and abnormal flow was observed. Probably because of this, the thermoforming container had unevenness and uneven thickness, and the transparency was also poor. Furthermore, the drop bag breaking strength of the container was reduced to about 1/4 of that of the unused product in the recovery layer.

Example 2 The composition (C) used in Example 1 was applied to a three-kind five-layer coextrusion machine to obtain a multilayer sheet {polypropylene resin layer, adhesive resin layer / composition (C) layer / adhesiveness. Resin layer / polypropylene resin layer} was prepared. The composition of the sheet is the polypropylene resin layer of both outermost layers (Mitsui Petrochemical Noblen PY
220) is 200μ, each adhesive resin layer (Mitsui Petrochemical Adma-QF500 maleic anhydride modified polypropylene) is 12μ, and the intermediate layer (C layer) is 12μ. Flatten the sheet into a 20 × 20 cm flat bag and fill it with water. 2
After adjusting the humidity at 0 ° C./65% RH, the result of measuring the oxygen permeability (gas barrier property) with OXTRAN manufactured by Mocon Co. 1.8
cc. 20 μ / m ² . day. Atm was good.

After filling this container with water, heat-sealing the upper lid and the surroundings, sterilization at 120 ° C. using a retort device {Hisaka Seisakusho Co., Ltd., sterilization tester for high temperature and high pressure RCS-40ORTGN}. The treatment was carried out. After the sterilization treatment, the cup was not observed to have poor transparency (whitening), poor appearance, and poor morphology. Further, the gas barrier property after leaving at 20 ° C./65% RH for one week was 2.2 cc. 20 μ / m ² . d
ay. Atm was good.

Comparative Example 2 The composition (C) of Example 1 was changed to EVOH (A) having an ethylene content of 32 mol% and a saponification degree of 99.5%.
A film was obtained in the same manner as in Example 2. The gas barrier property of this film was measured in the same manner as in Example 2, and as a result, it was found to be 1.2 cc. 20 μ / m ² . day. atm
Was good, but 8.3 cc. After retort. 20μ
/ M ² . day. The deterioration of the atm and the barrier property was remarkable.

Example 3 The composition (C) used in Example 1 was applied to a three-kind five-layer coextrusion machine to obtain a multilayer film {polyethylene resin layer / adhesive resin layer / composition (C) layer / adhesive resin layer. / Polyethylene resin layer} was prepared. The composition of the multilayer film was such that the outermost polyethylene resin layer was 60 μm, the adhesive resin layer (Mitsui Petrochemical: Admer NF-500, maleic acid modified polyethylene) was 10 μm each, and the intermediate layer (C layer) was 10 μm.
is μ.

The resulting multilayer films were evaluated for flex resistance and adhesiveness with a Gelbo flex tester. As a result, a through hole (pinhole) was formed only after the number of flexing was 480 times, and the EVOH / Ad bond strength was 450 g / 15 mm width, which was a relatively good performance. This multilayer film was useful as an inner bag for a back-in-box.

Comparative Example 3 The composition (C) of Example 1 was changed to EVOH (A) having an ethylene content of 32 mol% and a saponification degree of 99.5%.
A film was obtained in the same manner as in Example 3. The bending resistance of this film was 150 times, which was an unsatisfactory result.

Example 4 EV having an ethylene content of 47 mol%, a saponification degree of 99.0 mol% and a melt index value (190 ° C.) of 5.5 g / 10 minutes.
Hydrolyzed polypropylene oxide was cross-linked by irradiating 100 parts by weight of OH (A) with an electron beam of 20 megarads, 20 ° C.
Is substantially insoluble in water (dissolved residue 8%), has a water absorption rate of 20% at 20 ° C, and a melt index value (190 ° C, 216 ° C).
0 g) was mixed with 10 parts by weight of the crosslinked alkylene oxide resin (B) at 6.5 g / 10 min, and pelletized under the conditions of Example 1. The water absorption of the obtained composition (C) at 20 ° C. was 16%. The composition (C) was applied to a co-extrusion device of type 3 and 5 soda to prepare a multilayer sheet. The composition of the sheet is such that both outermost layers {EVA resin layer (Mitsui DuPont Chemical: Eva Flex EV-340)} are 300μ each and adhesive resin layer (Mitsui Petrochemical Admer VF-600) is 50 each.
μ, and the intermediate layer (C layer) is 50 μ. The obtained sheet was subjected to a pantograph-type biaxial stretching machine, and simultaneously biaxially stretched at 70 ° C. at a stretching ratio of 3 × 3. The obtained multilayer heat-shrinkable film was free from cracks, unevenness, uneven thickness, and had good appearance and transparency. This film is 20 ℃ -100%
When the humidity was adjusted to RH and the gas barrier property was measured (10/50 type manufactured by Mocon Co.), the oxygen permeability was 20 cc. 20μ /
m ² . 24 hr. Atm and good gas barrier property were exhibited. Further, when the heat shrinkability at 70 ° C. was measured, it showed an area shrinkage of 50%.

Example 5 A pellet of the composition (C) used in Example 1 was applied to a 4-type 5-layer coextrusion multi-layer pipe molding device to prepare a multi-layer pipe. The outermost layer (12 nylon layer) of the pipe is 450
μ, adhesive resin layer 50μ each, 6 nylon layer 100
μ, the composition (C) layer is 150 μ, and the innermost layer (6 nylon layer) is 250 μ. A metal fitting was attached to the end of the obtained pipe, wound in a loop at R (radius) = 30 cm, filled with gasoline, and left for 1 year under the conditions of 40 ° C and 65% RH. No deterioration was observed. As an accelerated test, cut the body of the pipe into slices so that 10% tensile elongation can be added.
The circular sliced pipe is spread (10% tensile elongation is added) with a cylindrical jig having an outer diameter 10% longer than the inner circumference of the pipe, and it is immersed in gasoline containing 40% 15% methanol for 3 hours for stress cracking. Was evaluated, but no crack was observed. The gasoline permeability of the pipe is 0.3 g / m ² . It was a day.

Comparative Example 4 Except that the composition (C) of Example 1 was changed to EVOH (A) having an ethylene content of 32 mol% and a saponification degree of 99.5%,
A film was obtained in the same manner as in Example 1. Obtained 100
As a result of immersing the μ monolayer film in gasoline in the same manner as in Example 1, stress cracks were observed. Also, 3 types 5
As a result of immersing gasoline in a multilayer container by layer coextrusion multilayer direct blow in the same manner as in Example 1, the gasoline barrier property after standing for 1 year was 0.01 to 0.9 g / m ² . day
The deterioration of the gasoline barrier property, which is estimated to be caused by cracks, was observed.

Example 6 A 100 μ monolayer film of the composition (C) used in Example 1 was laminated after coating an adhesive on the surface of an EL element (electroluminescent body) whose life is extremely deteriorated by water absorption. Further, a moisture-proof fluorine-based film was further laminated thereon. The EL element was placed in a constant temperature and high humidity room at 40 ° C. and 90% RH and the life was measured under severe conditions. As a result, no deterioration in long-term performance of 300 days or more was observed.

Comparative Example 5 Except that the composition (C) used in Example 1 was changed to EVOH {(A) having an ethylene content of 32 mol% and a saponification degree of 99.5%, 20 ° C. water absorption = 8%}. The same procedure as in Example 1 was performed. As a result, the life was 120 days, which was poor.

[0037]

The composition using the resin composition of the present invention is
It has excellent mechanical properties such as impact resistance, bending resistance, and pinhole resistance, and gas barrier properties during retort, and also has excellent stretch shrinkage and thermoformability, and also has stress crack resistance against organic liquids such as gasoline. Are better.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI C08L 71:02)

Claims (7)

(57) [Claims] 1. 190 , which is substantially insoluble in water, relative to 100 parts by weight of an ethylene-vinyl alcohol copolymer (A) having an ethylene content of 20 to 70 mol% and a saponification degree of 80% or more.
Melt index value of 0.1 at ℃ and load of 2160g
A resin composition containing 0.1 to 100 parts by weight of an alkylene oxide compound (B) of 100 g / 10 min . 2. A water absorption rate C of the resin composition at 20 ° C.
(W) (%) is the formula C (w)> 14-{(X-32) / 3} [where X in the formula is ethylene-vinyl alcohol copolymerization
Satisfying the ethylene content (mol%) of body (A)]
Item 1. The resin composition according to Item 1. 3. An alkylene oxide compound (B)
But ethylene oxide, at least one aliphatic resins <br/> according to claim 1, wherein a polyalkylene glycol-based resins obtained from the oxide compound is selected from the group consisting of propylene oxide and butylene oxide Composition. 4. An alkylene oxide compound (B)
However, under the alkaline catalyst
Polymerize into polyalkylene glycol resin
The composition according to claim 1, which is obtained by cross-linking.
The listed resin composition. 5. A multi-layer structure having a layer made of the resin composition according to claim 1. 6. The multilayer structure according to claim 5, including a recovery layer. 7. A container comprising the multilayer structure according to claim 5 .