JPH11207904A - Paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container which ensures enough adhesiveness even when a thermoplastic resin is extruded at low temp. to suppress generation of small molecule volatile ingredients caused by oxidative decomposition of the thermoplastic resin, and is excellent in odor and taste and has small oxygen permeability. SOLUTION: The paper container is obtd. by laminating at least one resin layer contg. a layer consisting of a polyamide resin obtd. of a diamine contg. at least 70 mole % m-xylylene-diamine and a dicarboxylic acid contg. at least 70 mole % 6-12C α,ω-aliph. dicarboxylic acid on a face of a base paper with a surface roughness Ra of 1.0-3.0 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a paper container suitable for filling a liquid content. More specifically, a polyamide resin (a) formed by a polycondensation reaction between a diamine containing meta-xylylenediamine as a main component and a specific dicarboxylic acid
The present invention relates to a paper container obtained by laminating a resin layer including a layer consisting of

[0002]

2. Description of the Related Art Conventionally, a paper container made of a laminate of base paper and a resin layer has a light weight, can be collected and reused after use, and has a relatively small amount of heat generated during incineration. Due to its advantages, it is widely used as a container for liquids such as fruit juice, alcoholic beverages, oils, detergents, and the like. Paper containers made of a laminate of base paper and a resin layer have different barrier properties for gases such as oxygen and water vapor (hereinafter referred to as "gas barrier properties") and adsorption properties to resin depending on the type of resin layer to be laminated. For example, paper containers having various resin layers laminated have been proposed in order to maintain the preservability of the flavor of the contents.

In these resin layers, a polyamide resin (hereinafter referred to as "nylon MXD6" or "NMX") formed by a polycondensation reaction between metaxylylenediamine and adipic acid is used.
D6) is known to have excellent gas barrier properties even under high humidity and to have excellent properties such that the contents are not easily oxidized or deteriorated. For this reason, Japanese Patent Application Laid-Open No. 6-305086 discloses a paper container made of a laminate of a resin layer made of nylon MXD6 and base paper.

In general, when a paper container is obtained by molding a laminate obtained by extruding and laminating a thermoplastic resin on a base paper, a base paper which is required to have excellent smoothness for aesthetic purposes is required. In many cases, not only the front surface on which printing and the like are performed but also the back surface, which is not related to the appearance, have been used with high smoothness. However, in such a base paper, the thermoplastic resin melted during extrusion lamination does not flow sufficiently between base paper fibers, so that the adhesiveness to the base paper is poor and the extrusion temperature has been excessively increased in order to obtain sufficient adhesive strength. When the extrusion temperature is increased, the amount of low molecular volatile components generated due to the oxidative decomposition of the thermoplastic resin and the like increases, which adversely affects taste and odor.

In order to suppress oxidative decomposition and the like, in order to secure sufficient adhesive strength even when extruded at a low temperature, it is necessary to increase the flow of the thermoplastic resin between the base paper fibers. When the roughness is increased, the surface smoothness of the thermoplastic resin layer laminated on the base paper is deteriorated, or the thermoplastic resin layer partially floats without adhering to the base paper. For these reasons, a container satisfying the adhesive strength, surface smoothness, taste, and odor cannot be obtained.

An object of the present invention is to laminate a resin layer including a layer composed of a polyamide resin (a) formed by a polycondensation reaction between a diamine containing metaxylylenediamine as a main component and a specific dicarboxylic acid, and a base paper. In a paper container consisting of a body,
An object of the present invention is to obtain a paper container which ensures sufficient adhesiveness even when extruded at a low temperature and suppresses the generation of low molecular volatile components due to oxidative decomposition of a thermoplastic resin and has excellent gas barrier properties.

The inventors of the present invention have conducted intensive studies on the above problems, and as a result, have been made of a polyamide resin (a) produced by a polycondensation reaction between a diamine containing metaxylylenediamine as a main component and a specific dicarboxylic acid. By limiting the surface roughness of the base paper to a specific range of 1.0 to 3.0 μm in a paper container made of a laminate of a resin layer including the base layer and the base paper, low molecular volatilization due to oxidative decomposition of the thermoplastic resin or the like It has been found that sufficient adhesiveness can be ensured even when extruded at a low temperature in order to suppress the generation of components, and the present invention has been completed.

That is, the present invention relates to a diamine containing at least 70 mol% of metaxylylenediamine and a diamine containing 6 to 12 carbon atoms.
Of at least one resin layer including a layer (A layer) composed of a polyamide resin (a) obtained from a dicarboxylic acid containing 70 mol% or more of α, ω-aliphatic dicarboxylic acid having a surface roughness Ra of 1.0 The present invention relates to a paper container obtained by laminating a base paper (layer B) having a thickness of about 3.0 μm.

In the present invention, the polyamide (a) comprises a diamine containing 70 mol% or more of meta-xylylenediamine and a dicarboxylic acid component containing 70 mol of an α, ω-aliphatic dicarboxylic acid having 6 to 12 carbon atoms. % Of a dicarboxylic acid. As diamines other than meta-xylylenediamine, aliphatic diamines such as paraxylylenediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine, nonamethylenediamine, and 1,3-bis (aminomethyl) Cyclohexane, 1,4
Alicyclic diamines such as -bis (aminomethyl) cyclohexane;

The α, ω-aliphatic dicarboxylic acids having 6 to 12 carbon atoms include adipic acid, pimelic acid, speric acid,
Examples thereof include aliphatic dicarboxylic acids such as azelaic acid, sebacic acid, 1,9-nonanedicarboxylic acid, and 1,10-dodecanedicarboxylic acid. Examples of the dicarboxylic acids used other than the α, ω-aliphatic dicarboxylic acids having 6 to 12 carbon atoms include aromatic dicarboxylic acids such as terephthalic acid and isophthalic acid.

When the content of metaxylylenediamine in the diamine component of the polyamide (a) is less than 70 mol%, the ability to block gaseous substances and liquid chemicals decreases, and the dependence of physical properties on water and the like increase. Therefore, the suitability as a gas barrier material is reduced.
When the dicarboxylic acid component used in the polyamide (a) is less than 70 mol% of α, ω-aliphatic dicarboxylic acid having 6 to 12 carbon atoms, for example, when the aromatic dicarboxylic acid exceeds 30 mol%, the polyamide obtained is In some cases, inconveniences such as a decrease in fluidity during extrusion molding may occur.

The polyamide (a) may be a mixture of another polyamide resin. Examples of the other polyamide resin to be mixed include nylon 6, nylon 66, nylon 46, nylon 610, nylon 12, and the like. . Furthermore, if desired, a small amount of a resin other than polyamide, such as polyethylene, ethylene-vinyl alcohol copolymer, ethylene-acrylic acid copolymer, ethylene-maleic anhydride copolymer, polyester, and polycarbonate can be mixed. . In the case of a resin mixture, in order not to excessively lower the gas barrier properties,
It is preferable to contain the polyamide (a) in an amount of 60% by weight or more.

The resin layer in the present invention may be a single layer or a multilayer of two or more layers, but it is necessary that at least one layer is a polyamide (a). A resin layer in which a layer of polyamide (a) is combined with a layer of another resin may be used. Examples of the resin composited with the polyamide (a) layer include polyethylene, polypropylene, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polystyrene, and the like.
Polyester such as polyethylene terephthalate, polycarbonate and the like can be mentioned, and these resin layers may be unstretched or uniaxially or biaxially stretched. The thickness of the resin layer depends on the type and properties of the contents of the paper container, but is preferably 5 to 40 μm. Further, a metal layer such as an aluminum foil or a tin foil can be combined with these resin layers for the purpose of imparting light-shielding properties or further improving gas barrier properties.

In the present invention, the layer of the polyamide (a) (layer A) can be provided at any position on the laminate constituting the container of the present invention. ), And preferably between the sealant layer (C layer). In the present invention, the sealant layer (C layer) is provided on the liquid contact side of the laminate, and is suitable for thermal bonding when the laminate is molded into a container. It refers to a layer of chain polyethylene, polypropylene, etc. The thickness of the sealant layer (C layer) is 40 ~
The thickness is preferably 80 μm. If the thickness is less than 80 μm, the adhesive strength may be insufficient or a void may be formed at the joint. If it is thicker than this,
Inconveniences such as deterioration of workability occur.

In the present invention, the base paper (B
The layer is not particularly limited as long as it is obtained by forming natural fibers, synthetic fibers or a mixture thereof, and examples of the natural fibers used for the forming include wood fibers such as softwood pulp and hardwood pulp, cotton yarn, and sugarcane. And vegetable fibers obtained by pulping bamboo and the like, and animal fibers such as wool and silk thread. Examples of the synthetic fibers include polyethylene, polypropylene, polyester, polyamide, and cellulose acetate. Among the base papers obtained from these fibers, those obtained from wood pulp are preferable in terms of the mechanical properties and thermal properties of the base paper, and coniferous pulp is dried in a dry state to reduce the total pulp in terms of the tensile strength. 40% by weight
Those made from wood pulp occupying the above are particularly preferred.

[0016] The base paper used in the present invention is made of an olefin-based, polyethyleneimine-based, isocyanate-based, polyester-based, polyurethane-based or vinyl-based undercoating agent in order to improve the adhesion to the resin layer. It is desirable that it is sometimes contained or applied to the surface of base paper after papermaking. Among these undercoat agents, polyethyleneimine-based undercoat agents are preferably used.

In the present invention, the surface of the base paper (layer B) laminated with the layer (layer A) made of polyamide (a) needs to have a surface roughness Ra of 1.0 to 3.0 μm. And particularly preferably 1.2 to 2.5 μm. In the present invention, the surface roughness Ra of the base paper (layer B) is JIS B
0601 is the center line average roughness according to “Definition and display of surface roughness”. When the surface roughness Ra of the base paper (layer B) is less than 1.0 μm, the thermoplastic resin melted during extrusion lamination does not sufficiently flow between the base paper fibers, so that the adhesiveness to the base paper (layer B) is deteriorated. . When the extrusion temperature is increased to obtain sufficient adhesive strength, the amount of low molecular volatile components generated by oxidative decomposition of the thermoplastic resin increases,
Bad taste and odor. When the surface roughness Ra of the base paper exceeds 3.0 μm, the surface smoothness of the thermoplastic resin layer laminated on the base paper (B layer) becomes poor,
The thermoplastic resin layer partially floats without adhering to the base paper.

In the present invention, a suitable surface roughness Ra
By using a base paper (layer B) having the following, sufficient adhesiveness can be obtained even at a low extrusion temperature, but lowering the extrusion temperature also has an effect of reducing neck-in.

As a method for obtaining a laminate of the resin layer and the base paper (layer B), a method of sequentially extruding and laminating the resin forming the resin layer, and simultaneously performing multilayer melt extrusion using a plurality of extruders and feed blocks. Lamination, sand lamination, dry lamination,
A method in which melt extrusion lamination is appropriately combined can be used. Further, a physicochemical treatment such as a corona treatment, a plasma treatment, or an ozone treatment can be performed during the step of providing or laminating each resin forming the resin layer or the sealant layer, or before laminating.

Examples of the resin having high adhesiveness include polyethylene, ethylene-vinyl acetate copolymer, maleic anhydride-modified ethylene-vinyl acetate copolymer, maleic anhydride-modified polyethylene, ethylene-methyl acrylate copolymer,
Examples include an ethylene-methyl methacrylate copolymer, maleic anhydride-modified polypropylene, and an ionomer copolymer. A step of punching out a target container in a developed state from a laminate of a base paper and a resin layer containing at least one layer of the polyamide (a) thus obtained, forming a ruled line, and, if necessary, a cross section of the contents and the base paper To obtain the desired paper container through the usual container manufacturing process such as a process of bending the bonded portion of the body to the outside so that the body does not contact (skiving), a process of bonding the body, and a process of forming the bottom and the head. Can be.

The paper container of the present invention obtained as described above comprises:
Various shapes and sizes of cartons, cups, etc., fruit juice, milk drinks such as milk and yogurt, alcoholic drinks,
Contents such as edible oils such as mineral water and salad oil, industrial oils and detergents can be filled and used suitably.

[0022]

EXAMPLES 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 addition, the measuring method of each physical property of the base paper used and the obtained thing used in this example and this comparative example is as follows.

(1) Base Paper A base paper made from wood pulp in which softwood pulp and hardwood pulp were mixed in a dry state with a pulp fiber weight ratio of 70/30 was used. (2) Surface roughness Ra of base paper The surface roughness of base paper is a center line average roughness according to JIS B0601, manufactured by Tokyo Seimitsu Co., Ltd., model: Surfcom12.
Measurements were made using 0A.

(3) Adhesion strength Measurement was carried out in accordance with JIS K 6854 using a model: Autograph AGS-500D manufactured by Shimadzu Corporation. The measurement point is the part where the base paper and the multilayer melt-extruded and laminated.If the resin layer is firmly adhered when peeling, the paper layer of the base paper is taken evenly by the resin layer. Expressed as delamination.

(4) Sensory test for odor Sensory laminates of each test were cut into 2 × 5 cm and 25
Put in 0ml heat resistant bottle for odor sensory test, cover and seal. What was heated in a dryer at 80 ° C for 2 minutes
Zero panelists compare the odors of each sample and score. The scoring was performed on a 5-point scale with 5 points having a low odor and 1 point having a strong odor, and the average value was taken as the odor score.

(5) Taste sensory test The laminate of each sample was formed into a 1.8-liter container, filled with mineral water, and evaluated one week later by 20 panelists. As for the scoring, those with little off-tastes are scored 5 points,
Five-point evaluation was performed with one having strong off-taste as one point, and the average value thereof was taken as the score of taste.

(6) Oxygen permeability The oxygen permeability was measured according to ASTM D3985. Made by ModernControl, Model: OXTRAN 10 /
Using 50A, the measurement conditions were a temperature of 23 ° C., a relative humidity of 100% on the inner surface side of the container, and a relative humidity of 50% on the outer side of the container.

Example 1 A low-density polyethylene (constituting an L layer, hereinafter referred to as "LDPE") may be obtained from an extruder having a cylinder diameter of 40 mm.
Nylon MXD6 (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name: M) as a polyamide (a) from an extruder having a cylinder diameter of 40 mm manufactured by Tosoh Corporation, trade name: Petrocene 204)
X nylon 6007) 80 parts by weight and polyamide 66 as a polyamide (b) mixed with 20 parts by weight of nylon 66 (trade name: Ube Nylon 2020B) (polyamide (c) (constituting M layer), cylinder diameter: Adhesive polyethylene (composed of N layers, manufactured by Mitsubishi Chemical Corporation, trade name: Modic M515V) from a 30 mm extruder and low density polyethylene (P) from a 45 mm cylinder extruder
Composed of layers, manufactured by Tosoh Corporation, trade name: Petrocene 20
4) is extruded to form a multilayer molten state through a feed block so that the layer configuration is in the order of L layer / N layer / M layer / N layer / P layer, and the base paper having a basis weight of 400 g / m ² is previously formed. A low-density polyethylene (Mitsubishi Chemical Corp., Novatec L300) 20 μm was extruded and laminated onto a base paper having a surface roughness Ra of 2.2 μm. 280 ° C to be laminated
Was laminated.

The thickness of each layer is L layer / N layer / M layer / N layer /
50/10/18/10/10 (μm) for each P layer
The total thickness was 98 μm. From the above-mentioned laminate, punching, crease, skive, after each step of thermal bonding of the body by flame heating, the laminate was formed into a sleeve, and then filled with mineral water using a molding and filling machine, Each side of a 1.8 liter square cylindrical shape is 8.5c
m, a height of 25.7 cm, and a paper container having a roof type (Göbel top type) at the top. Table 1 shows the values of the adhesive strength, the odor of paper containers, the taste test, and the oxygen permeability of the produced laminate.
The adhesive strength, odor, and taste test were good, and the oxygen permeability was 13.3 cc / m ² -day-atm, which was satisfactory.

Example 2 Low-density polyethylene (composed of L layer, manufactured by Tosoh Corporation, trade name: Petrocene 204) from an extruder having a cylinder diameter of 40 mm, and nylon (a) as a polyamide (a) from an extruder having a cylinder diameter of 40 mm Polyamide obtained by mixing 80 parts by weight of MXD6 (manufactured by Mitsubishi Gas Chemical Company, trade name: MX nylon 6007) and 20 parts by weight of nylon 66 (manufactured by Ube Industries, Ltd., trade name: Ube nylon 2020B) as polyamide (b) (C) Extruding adhesive polyethylene (constituting an N layer, manufactured by Mitsubishi Chemical Corporation, trade name: Modic M515V) from an extruder having a cylinder diameter of 30 mm (constituting an M layer) and having an L layer / N layer / M layer to form a multi-layer melted state through a feed block so that the order of the advance, the low-density base paper having a basis weight of 400 g / m ² Riechiren (Mitsubishi Chemical Co., Ltd., trade name: Novatec L300) of 20μm what was extrusion lamination,
The base paper having a surface roughness Ra of 1.7 μm was laminated at 280 ° C. so that the M layer was laminated on the base paper while performing corona treatment. The thickness of each layer was 50/10/18 (μm) for the L layer / N layer / M layer, and the total thickness was 78 μm.

A paper container was obtained from the above-mentioned laminate in the same manner as in Example 1. Table 1 shows the adhesive strength of the laminated body,
The values of the odor, taste test, and oxygen permeability of the paper container are shown. Adhesion strength, odor, taste test are also good, and oxygen permeability is
8.3 cc / m ² -day-atm was satisfactory.

Example 3 From an extruder having a cylinder diameter of 40 mm, low-density polyethylene (composed of L layer, manufactured by Tosoh Corporation, trade name: Petrocene 204), and nylon (a) as a polyamide (a) from an extruder having a cylinder diameter of 40 mm MXD6 (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name: MX nylon 6007) (constituting M layer), and adhesive polyethylene (constituting N layer, manufactured by Mitsubishi Chemical Corporation) from an extruder having a cylinder diameter of 30 mm. Name: Modic M515V), and the layer configuration is L layer /
A multilayer melted state is formed via a feed block so as to be in the order of N layer / M layer, and a basis weight of 400 g /
in m ² base paper low density polyethylene (Mitsubishi Chemical Co.,
(Trade name: Novatec L300) A 20 μm extrusion-laminated product was laminated at 280 ° C. on a base paper surface having a surface roughness Ra of 1.2 μm so that the M layer was laminated on the base paper while performing corona treatment. The thickness of each layer is L layer / N
Each layer / M layer had a thickness of 50/10/18 (μm) and a total thickness of 78 μm.

From the above-mentioned laminate, the same steps as in Example 1
Thus, a paper container was obtained. Table 1 shows the adhesive strength of the laminated body,
The values of the odor, taste test, and oxygen permeability of the paper container are shown. Bonding
The strength, odor and taste tests are also good, and the oxygen permeability is
7.2cc / m ^Two-day-atm was satisfactory.

Comparative Example 1 Using the same apparatus as in Example 1, the basis weight was 400
g / m ² , and 280 using a base paper having a surface roughness Ra of 0.9.
The same paper container was produced by laminating at a temperature of ° C. Table 2 shows the values of the adhesive strength, the odor of paper containers, the taste test, and the oxygen permeability of the produced laminate. The bond strength was insufficient.

Comparative Example 2 Using the same apparatus as in Example 1, a basis weight of 400
g / m ² and a surface roughness Ra of 310 using a base paper of 0.8.
The same paper container was produced by laminating at a temperature of ° C. Table 2 shows the values of the adhesive strength, the odor of paper containers, the taste test, and the oxygen permeability of the produced laminate. Although the adhesive strength was sufficient, taste and odor were not satisfactory.

Comparative Example 3 Using the same apparatus as in Example 1, the basis weight was 400
g / m ² , and 280 using base paper having a surface roughness Ra of 3.5.
The same paper container was produced by laminating at a temperature of ° C. Table 3 shows the values of the adhesive strength, the odor of the paper container, the taste test, and the oxygen permeability of the produced laminate. In addition to the fact that there was a portion that did not adhere and floated, the smoothness of the inner resin layer was low, and was insufficient.

Comparative Example 4 The same apparatus as in Example 1 was used, and the basis weight was 400
g / m ² , and 310 using a base paper having a surface roughness Ra of 3.2.
The same paper container was produced by laminating at a temperature of ° C. Table 3 shows the values of the adhesive strength, the odor of the paper container, the taste test, and the oxygen permeability of the produced laminate. There were some parts that did not adhere, and they were not satisfactory in terms of odor and taste.

As is clear from the results shown in Tables 1, 2, and 3, the paper container obtained by the present invention has sufficient adhesive strength, good gas barrier properties, and furthermore, odor and taste. Is satisfied.

According to the present invention, by limiting the surface roughness Ra of the paper laminated on the resin layer including the layer composed of the polyamide resin (a) to a specific range of 1.0 to 3.0 μm, the oxidation of the thermoplastic resin can be prevented. It is possible to obtain a paper container that can secure sufficient adhesiveness even when extruded at a low temperature in order to suppress generation of low molecular volatile components due to decomposition and the like.

[0040]

Table 1 Example No. 1 23 Polyamide (a) NMXD6 NMXD6 NMXD6 Polyamide (b) N66 N66- NMXD6 / Nylon 66 (wt ratio) 80/20 80/20 100/0 Molding conditions Extrusion temperature (° C) 280 280 280 Surface roughness Ra (μm) 2.2 1.7 1.2 Thickness of each layer (μm) L / N / M / N / P 50/10/18/10/10--L / N / M-50 / 10/18 50/10/18 Total thickness (μm) 98 78 78 Evaluation result Adhesive strength (gf / 15mm) Paper layer peeling Paper layer peeling Paper layer peeling Odor sensory test 4.0 4.2 4.2 Taste sensory test 3.9 4.2 4.0 Oxygen permeability (cc / m ² -day-atm) 13.3 8.3 7.2

[0041]

Comparative Example No. 12 Polyamide (a) NMXD6 NMXD6 Polyamide (b) Nylon 66 Nylon 66 NMXD6 / Nylon 66 (wt ratio) 80/20 80/20 Molding conditions Extrusion temperature (° C.) 280 310 Surface roughness Ra (Μm) 0.9 0.8 Thickness of each layer (μm) L / N / M / N / P 50/10/18/10/10 50/10/18/10/10 Total thickness (μm) 98 98 Evaluation Result Adhesive strength (gf / 15mm) 200 Paper layer peeling Odor sensory test 3.9 2.1 Taste sensory test 4.3 1.7 Oxygen permeability (cc / m ² -day-atm) 13.3 13.1

[0042]

Table 3 Comparative Example No. 34 Polyamide (a) NMXD6 NMXD6 Polyamide (b) Nylon 66 Nylon 66 NMXD6 / Nylon 66 (wt ratio) 80/20 80/20 Molding conditions Extrusion temperature (° C) 280 310 Surface roughness Ra (Μm) 3.5 3.2 Thickness of each layer (μm) L / N / M / N / P 50/10/18/10/10 50/10/18/10/10 Total thickness (μm) 98 98 Evaluation Result Adhesive strength (gf / 15mm) Non- adhesive part present Non- adherent part present Odor sensory test 3.7 1.8 Taste sensory test 4.0 2.0 Oxygen permeability (cc / m ² -day-atm) 13.8 12.8

[0043]

As described in the present invention, when the surface roughness of the base paper is limited to 1.0 to 3.0 μm in a paper container formed of a laminate of a resin layer including a layer made of nylon MXD6 and base paper, Even if the thermoplastic resin is extruded at a low temperature, sufficient adhesiveness can be ensured, and generation of low molecular volatile components due to oxidative decomposition and the like can be suppressed. Therefore, various shapes,
It can be used as cartons, cups, etc. of size, and can be used for contents such as fruit juice, milk drinks such as milk, alcohol drinks, mineral water, edible oils such as salad oils, industrial oils, detergents, etc. Excellent effect on storage stability.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuko Kubota 866 Koizumi, Fujinomiya City, Shizuoka Prefecture Inside Tokyo Paper Co., Ltd. (72) Koji Yamamoto, Inventor 5-6-1, Higashi-Hachiman, Hiratsuka-shi, Kanagawa Sanritsu Gas Chemical Co., Ltd. Ryogas Chemical Co., Ltd. Hiratsuka Laboratory

Claims (3)

[Claims] 1. A polyamide resin (a) obtained from a diamine containing at least 70 mol% of meta-xylylenediamine and a dicarboxylic acid containing at least 70 mol% of an α, ω-aliphatic dicarboxylic acid having 6 to 12 carbon atoms. 1 including layer (layer A)
Resin layer having a surface roughness Ra of 1.0 to 3.0 μm
A paper container obtained by laminating the base paper (layer B). 2. The base paper has a surface roughness Ra of 1.2 to 2.5 μm.
The paper container according to claim 1, wherein m is m. 3. The resin layer according to claim 1, which has a thickness of 40 to 8
A paper container provided with a sealant layer (C layer) of 0 μm.