JP2002205358A - Paper laminate for packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material which has a paper layer, a barrier layer inside the paper layer and further a polyethylene layer inside the barrier layer and makes the outward appearance of a container excellent when used as the container for liquid food or the like. SOLUTION: The present paper laminate for the packaging material has a polycyclic olefin copolymer containing layer at least outside the paper layer, the barrier layer at least inside the paper layer and further the polyethylene layer inside the barrier layer. The polyethylene layer is constituted of a straight- chain low-density polyethylene manufactured by using a metallocene catalyst.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material paper laminate, and more particularly to a packaging material paper laminate suitable for packaging liquids such as liquid foods.

[0002]

2. Description of the Related Art Conventionally, a packaging material such as a liquid food is mainly made of paper, and a material obtained by laminating a material such as a plastic film such as polyethylene, polypropylene, polyester, or polyvinyl chloride is used. In addition, such packaging materials are often provided with a barrier layer inside the packaging material to protect the liquid as an internal filling material, and a packaging container is produced using the packaging material inside the barrier layer. For convenience, a polyethylene layer having good adhesiveness is also provided.

[0003] In these packaging materials, the packaging material obtained by laminating the above-mentioned plastic film or the like so as to be on the outside of the paper, if a packaging container is manufactured using this packaging material, the appearance of the obtained packaging container is never satisfactory. It cannot be said that the appearance deteriorates particularly with the use of the packaging container. In addition, the internal filling in the container may seep out.
Such an obstacle tends to be remarkable especially when the container filled with the internal filling is handled at a high temperature such as bending at 70 ° C. or more or retorting at a temperature up to about 130 ° C. Is shown.

[0004] The reason for this is that the rigidity, gloss, transparency, scratch resistance, heat resistance, moisture resistance, etc. of the plastic film and the like decrease with the use of the packaging container. Therefore, even if a packaging container filled with the internal filling is used, the appearance of a material that does not deteriorate in the above properties is expected.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a liquid food or the like in which a packaging material having a paper layer and a barrier layer on the inside thereof and a polyethylene layer on the inside thereof has a good appearance and the internal filling does not seep outside. The purpose of the present invention is to provide a packaging material.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above problems, and as a result, have found that a paper layer of a packaging material having a paper layer, a barrier layer inside the paper layer, and a polyethylene layer inside the paper layer. It has been found that the object of the present invention can be achieved by providing at least a layer containing a polycyclic olefin copolymer on the outside of the above, and the present invention has been achieved. In the present invention, the inner layer refers to a layer on the side in contact with the inner filler when the inner filler is packaged using the packaging material laminate, and the outer layer refers to a layer on the opposite side. Similarly, when packing the internal filling, the inside refers to the side near the internal filling, and the outside refers to the opposite side.

That is, the present invention is characterized in that the paper layer has at least a polycyclic olefin copolymer-containing layer outside, and the paper layer has at least a barrier layer inside and a polyethylene layer further inside. The gist is a packaging paper laminate. Moreover, the packaging material paper laminate of the present invention is characterized in that the polycyclic olefin copolymer-containing layer is in contact with the outer surface of the paper layer.

The present invention further provides a packaging paper laminate having a polyethylene layer between the paper layer and the barrier layer.

The present invention further provides a packaging paper laminate having at least a thermoplastic resin layer between the polycyclic olefin copolymer-containing layer and the paper layer.

[0010] The present invention further provides a packaging paper laminate having a metallized layer on one side of the thermoplastic resin layer.

The present invention further provides a packaging material paper laminate having a thermoplastic resin layer outside the above-mentioned polycyclic olefin copolymer-containing layer.

[0012] Further, the paper laminate of the packaging material of the present invention is characterized in that the polycyclic olefin copolymer is a copolymer of a cyclic olefin and ethylene or α-olefin. Further, the paper laminate of the packaging material of the present invention is characterized in that the polyethylene layer is made of linear low-density polyethylene produced by using a metallocene catalyst. Further, the packaging material paper laminate of the present invention is characterized in that the thermoplastic resin layer comprises a polyolefin layer.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The packaging paper laminate of the present invention comprises:
It has at least a polycyclic olefin copolymer-containing layer outside the paper layer, and has at least a barrier layer inside the paper layer and a polyethylene layer further inside (a laminate 1).

The paper forming the paper layer has a basis weight of 50 to 350.
g / m ² can be used.

The polycyclic olefin copolymer of the polycyclic olefin copolymer-containing layer forming the laminate 1 of the present invention may be a copolymer of a polycyclic olefin and ethylene or α-olefin, or a polycyclic olefin and a monocyclic olefin. Examples include copolymers of olefins and copolymers of polycyclic olefins and non-conjugated dienes. Copolymers of polycyclic olefins and ethylene or α-olefins, especially copolymers of polycyclic olefins and ethylene, Polymers are preferred.

The polycyclic olefin includes bicyclo
[2,2,1] -Hept-2-ene and its derivatives,
Toracyclo [4,4,0,1^2,5, 1^7,10] -3-Dode
Sen and its derivatives, hexacyclo [6,6,1,1
^3,6, 1^10,13, 0^2,7, 0^9,14] -4-Heptadecene
And its derivatives, octacyclo [8,8,0,1^2,9,
1^{Four, 7}, 1^11,10, 1^13,16, 0^3,8, 0^12,17] -5
-Dococene and its derivatives, pentacyclo [6,6,
1,1^3,6, 0^2,7, 0^9,14-4-hexadecene and
Its derivative, pentacyclo [6,5,1,1^3,6, 0
^2,7, 0^9,134-pentadecene and its derivatives;
Butacyclo [8,7,0,1^2,9, 1^4,7, 1^{11,1 7},
0^3,8, 0^12,15] -5-Hen-eicosene and its induction
Body, heptacyclo [8,8,0,1^2,9, 1^4,7, 1
^11,16, 0^3,8, 0^12,17-5-heneicosen and
Its derivative, tricyclo [4,4,0,1^2,5] -3-
Undecene and its derivatives, tricyclo [4,3,0,
1^2,5] -3-decene and its derivatives, pentacyclo
[6,5,1,1^3,6, 0^2,7, 0^9,13] -4,10-
Pentadecadiene and its derivatives, pentacyclo [4,
7,0,1^2,5, 0^8,13, 1^9,12] -3-pentadecene
And its derivatives, heptacyclo [7,8,0,1^3,5,
1 ^2,7, 1^10,17, 0^11,16, 0^12,15] -4-eiko
Sen and its derivatives, nonacyclo [10,1,1^4,7,
0^3,8, 0^2,10, 0^12,21, 1^13,20, 0^14,19, 0
^15,19] -5-pentacecon and derivatives thereof, and the like.
It is.

Examples of the α-olefin copolymerized with the polycyclic olefin include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene and 1-nonene. , 1-decene and the like. Examples of the monocyclic olefin include cyclobutene, cyclopentene, cyclohexene, 3-methylcyclohexene, cyclooctene, and the like. Non-conjugated dienes include 1,4-hexadiene and 4-methyl-
Examples thereof include 1,4-hexadiene and 1,7-octadiene. One or more of these olefins copolymerized with the polycyclic olefin can be used.

The copolymerization of a polycyclic olefin with the above olefins is usually carried out by using titanium, zirconium, vanadium,
The reaction is performed at a temperature of −50 to 150 ° C. in the presence or absence of a medium such as an organic solvent using a catalyst in which a transition metal compound such as hafnium and an organic aluminum compound are combined. The polycyclic olefin copolymer used in the present invention produced by the above copolymerization is a random copolymer of a polycyclic olefin and the above olefins, and the structural unit derived from the polycyclic olefin has a content of 30 to 95. Molar%, especially 40 to 80 mole% is preferred.

The layer containing the polycyclic olefin copolymer may be a single layer of the above-mentioned polycyclic olefin copolymer or a mixture with another substance. As a substance that can be mixed with the polycyclic olefin copolymer, a polyolefin such as polyethylene, polypropylene, ethylene-propylene copolymer, and polybutene-1 is preferable. Examples of polyethylene include high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, and linear low-density polyethylene (hereinafter, referred to as mLLDPE) produced by using a metallocene catalyst.

MLLDPE has a narrow molecular weight distribution (weight average molecular weight / number average molecular weight) of 2 to 4 and a density of 0.900.
Preferably those ~0.925g / cm ^3, but those density of 0.900~0.915g / cm ³ are preferred.
Further, those having a melt flow index (MFI: 190 ° C., load 2.16 kg) of 10 to 20 g / 10 min are preferable.

[0021] Such mLLDPE has a carbon number of 4 to 8 for ethylene and comonomer in the presence of a metallocene catalyst.
Α-olefins, preferably 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, etc., produced by copolymerizing α-olefins having 6 or more carbon atoms are desirable. .

The above-mentioned metallocene catalyst is a compound having a structure in which a transition metal such as titanium, zirconium or hafnium is sandwiched by an unsaturated cyclic compound containing a π-electron cyclopentadienyl group or a substituted cyclopentadienyl group. It is a combination of a metallocene and a cocatalyst such as an aluminum compound such as alkylaluminoxane, alkylaluminum, aluminum halide, and alkylaluminum halide.

When the polycyclic olefin copolymer is mixed with another substance, preferably a polyolefin, the polycyclic olefin copolymer is preferably at least 50% by weight, particularly preferably at least 60% by weight. The thickness of the layer containing the polycyclic olefin copolymer is usually 10 to 100 μm.

The laminate 1 of the present invention is characterized by having at least a barrier layer inside the paper layer and a polyethylene layer inside the barrier layer. The barrier layer may be composed of a barrier material alone or may have a multilayer structure containing the barrier material. Examples of the barrier material include aluminum foil, silicon oxide-deposited polyethylene phthalate, ethylene-vinyl alcohol copolymer, and nylon resin. Examples of the multilayer structure containing a barrier material include a polyethylene film / aluminum foil, an adhesive polyethylene / silicon oxide-deposited polyethylene terephthalate biaxially stretched film (/ adhesive), and a polyethylene film / adhesive / ethylene-vinyl alcohol copolymer film. / Adhesive, nylon resin film / adhesive and the like. The thickness of the barrier layer is usually 5 to 20 μm.

The polyethylene of the polyethylene layer provided inside the barrier layer may be any of high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, and the above-mentioned mLLDPE. These polyethylene layers may be a plurality of layers, in which case different types of polyethylene layers may be used. However, as in the laminate 1 (the same applies to the laminates 2 to 6 described later), the outermost layer of the laminate has many layers. In the case of a cyclic olefin copolymer-containing layer, the polycyclic olefin copolymer-containing layer and the polyethylene layer are adhesive, so that the polycyclic olefin copolymer-containing layer of the laminates 1 to 6 and the polyethylene layer are bonded. This is convenient for producing a packaging container. Among the above polyethylene, the above mLL
Since DPE shows the best adhesiveness to the polycyclic olefin copolymer, the sealing property of the obtained packaging container can be improved by using the above-mentioned mLLDPE layer as the innermost layer of the laminate. The thickness of the polyethylene layer is usually 20 to 50 μm.

The laminate of the present invention is characterized in that the laminate 1 has a polyethylene layer between the paper layer and the barrier layer (laminate 2). The polyethylene of the polyethylene layer may be any of high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene. These polyethylene layers may be a plurality of layers,
In this case, different types of polyethylene layers may be used. The thickness of the polyethylene layer is usually 10 to 50 μm.

The laminate 1 and the laminate 2 of the present invention each have a structure in which the polycyclic olefin copolymer-containing layer is in direct contact with the outer surface of the paper layer. A configuration in which one or more other layers are provided between the olefin copolymer-containing layer and the olefin copolymer-containing layer (laminate 2 and laminate 4) can be adopted, and a layer made of a thermoplastic resin is preferable as the other layer.
Examples of the thermoplastic resin include polyolefin, nylon, polyester, and polyvinyl chloride. Examples of the polyolefin include polyethylene, polypropylene, an ethylene-propylene copolymer, and polybutene-1. As nylon, nylon 6, nylon 6
6, nylon-11, nylon-12 and the like.
As polyester, polyethylene terephthalate,
And polybutylene terephthalate. Among these thermoplastic resins, polyolefins, particularly polyethylene, are preferred. The polyethylene may be any of high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene. When a plurality of the thermoplastic resin layers are provided, each of the thermoplastic resin layers may be the same type of layer or different types of layers. The thickness of the thermoplastic resin layer is usually 5 to 200 μm.

The laminates 3 and 4 of the present invention are characterized by having a metal deposition layer on one surface of the thermoplastic resin layer (laminates 5 and 6). Examples of the metal of the metal deposition layer include aluminum, alumina, and silver.
Particularly, aluminum is preferable. The thickness of the metal deposition layer is 2
100-600 Å (20-60 nm), especially 300-550 Å (30-55 nm)
It is preferred that

The method of forming a metal vapor deposition layer on one side of the thermoplastic resin layer is carried out by using a commonly used batch type vacuum vapor deposition apparatus or continuous vacuum vapor deposition apparatus by introducing high purity metal such as aluminum into a high frequency induction metal. For example, 1,300 to 1,4 by heating, direct current heating, electron beam heating, etc.
Heating and evaporating to 50 ° C. is performed at a degree of vacuum of about 10 to 100 mPa. Before forming the metal film, the surface of the thermoplastic resin layer may be subjected to an anchor coating treatment. Anchor coat treatment is nitrocellulose, polyurethane,
Polyester system, vinyl chloride-vinyl acetate copolymer system,
Acrylic copolymer system, or an anchor coating agent such as a mixture thereof is applied to the surface of the thermoplastic resin layer,
This is achieved by removing the solvent in the anchor coating agent by drying. The thickness of the anchor coat layer obtained by the anchor coat treatment may usually be about 0.05 to 1 μm. In the case where vacuum deposition is performed without performing the anchor coat treatment, it is possible to take measures for improving the adhesion such as corona discharge treatment on the surface of the thermoplastic resin layer in advance. One surface of the thermoplastic resin layer forming the metal deposition layer may be inside or outside the thermoplastic resin layer.

Further, each of the laminates 1 to 6 of the present invention can have a structure (laminates 7 to 12) in which one or more other layers are provided outside the above-mentioned polycyclic olefin copolymer-containing layer. ,
As the other layer, a layer made of a thermoplastic resin is preferable. Examples of the thermoplastic resin include polyolefin, nylon, polyester, and polyvinyl chloride. Examples of the polyolefin include polyethylene, polypropylene, an ethylene-propylene copolymer, and polybutene-1. As nylon, nylon 6, nylon 6-6,
Nylon-11, nylon-12 and the like can be mentioned. Examples of the polyester include polyethylene terephthalate and polybutylene terephthalate. Among these thermoplastic resins, polyolefins, especially polyethylene, are preferred. The polyethylene may be any of high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene. When a plurality of the thermoplastic resin layers are provided, the respective thermoplastic resin layers may be the same type of layer or different types of layers. The thickness of the thermoplastic resin layer is usually 5 to 200 μm.

Each of the above-mentioned laminates of the present invention can further be provided with a printed layer. For example, the laminates 1 and 2 are inside the polycyclic olefin copolymer-containing layer or between the polycyclic olefin copolymer-containing layer and the paper layer, and the laminates 3 to 6 are inside, outside, or inside the thermoplastic resin layer. The laminates 7 to 12 can be provided inside, outside or inside the external thermoplastic resin layer, or inside, outside or inside the internal thermoplastic resin layer, respectively. It may be printed on the spot.

The laminate for packaging material of the present invention is obtained by laminating the above-mentioned respective layers. The method of joining these layers to form a laminate includes a method performed through an adhesive, Conventionally, when a laminated body is manufactured, such as a method of hot-melting a layer that can be bonded to a layer in contact with it, a method of simultaneously extruding and laminating layers that can be simultaneously extruded, and a method of combining them, etc. Any of the methods described can be employed.

From the above laminates for packaging materials of the present invention,
A rectangular parallelepiped such as a tetrabrick (trademark) type, a rectangular parallelepiped with a roof represented by a 1-liter milk container, a cube, a cylindrical shape, a parallel octagonal prism, a parallel octagonal prism at the center of the trunk, and a top and a bottom of 4
Conventionally known arbitrary forms of packaging containers and the like, such as a square tetraprisma (trademark) type and a pouch, can be formed.

[0034]

The present invention will be described below in detail with reference to examples. Example 1 Polycyclic olefin copolymer (polycyclic olefin component 60 mol%, ethylene component 40 mol%) film (25 μm), kraft paper (basis weight: 220 g /
m ² ), aluminum foil (7 μm) and density: 0.91
A 5 mm / cm ³ , MI: 14 g / 10 min mLLDPE film (20 μm) was laminated using an adhesive to produce a laminate of the present invention.

Example 2 A film (25 μm) formed from a mixture of 70% by weight of the polycyclic olefin copolymer and 30% by weight of low-density polyethylene used in Example 1, kraft paper (basis weight: 200 g / m 2) ² ) A low-density polyethylene film (20 μm), an aluminum foil (7 μm) and the mLLDPE film used in Example 1 were laminated using an adhesive to produce a laminate of the present invention.

Example 3 A film (25 μm) formed from a mixture of the polycyclic olefin copolymer and low density polyethylene used in Example 2, a low density polyethylene film (20 μm), kraft paper (basis weight: 180 g) /
m ² ), the aluminum foil (7 μm) and the mLLDPE film used in Example 1 were laminated using an adhesive to produce a laminate of the present invention.

Example 4 Polypropylene, a mixture of 80% by weight of the polycyclic olefin copolymer used in Example 1 and 20% by weight of polypropylene and polypropylene were simultaneously melt-extruded to obtain a polypropylene film (25 μm).
m), a composite 1 comprising a mixture film (25 μm) of a polycyclic olefin copolymer and polypropylene and a polypropylene film (20 μm) was obtained. Next, a low-density polyethylene film (20 μm) and kraft paper (basis weight: 200 g) were added to the polypropylene film of the composite 1.
/ M ² ), the aluminum foil (7 μm) and the mLLDPE film used in Example 1 were laminated using an adhesive to produce a laminate of the present invention.

Example 5 Low-density polyethylene, a mixture of 70% by weight of the polycyclic olefin copolymer used in Example 1 and 20% by weight of low-density polyethylene and a linear low-density polyethylene were simultaneously melt-extruded. A composite 2 comprising a low-density polyethylene film (20 μm), a mixture film of a polycyclic olefin copolymer and low-density polyethylene (25 μm), and a linear low-density polyethylene film (20 μm) was obtained. Next, after the surface of the linear low-density polyethylene film of the composite 2 was subjected to anchor coating treatment, aluminum was vacuum-deposited thereon at 1,350 ° C. to provide an aluminum-deposited layer having a thickness of 45 nm. Further, an adhesive is applied to a low-density polyethylene film (20 μm), kraft paper (basis weight: 210 g / m ² ), a low-density polyethylene film (20 μm), an aluminum foil (7 μm), and a linear low-density polyethylene film (20 μm). To produce a laminate of the present invention.

Comparative Example 1 A biaxially stretched polypropylene film (20 μm) was used in place of the film molded from the mixture of the polycyclic olefin copolymer and low-density polyethylene used in Example 2. A laminate was produced in the same manner as in Example 2.

Comparative Example 2 A biaxially stretched polyethylene terephthalate film (12 μm) was used in place of the film formed from the mixture of the polycyclic olefin copolymer and low-density polyethylene used in Example 2. A laminate was manufactured in the same manner as in Example 2.

Using the laminates produced in Examples 1 to 5 and Comparative Examples 1 and 2, 200 ml of a brick type liquid food container was prepared and filled with water, and the performance of the container was determined as follows. It was evaluated in the same way. The results are shown in Table 1. In Table 1, ◎ indicates excellent, ○ indicates good, and △ indicates acceptable.

External Inspection The appearance (gloss, transparency) of the container immediately after filling with water and that stored at 55 ° C. for 2 weeks was visually observed.

[0043]

[Table 1] As is clear from the results in Table 1, the container molded using the conventional laminate according to the comparative example deteriorates in appearance when stored at a high temperature, whereas the container according to each example uses the laminate according to each example. It can be seen that the molded container does not change at all.

[0044]

When a container is formed using the laminate of the present invention, the rigidity, gloss, transparency, etc. of plastics and the like conventionally used by the polycyclic olefin copolymer-containing layer constituting the outer layer of the paper layer can be improved. The scratch resistance, heat resistance, moisture resistance, etc. are improved, and the appearance and appearance of the container are improved.
Since the polycyclic olefin copolymer-containing layer has good adhesion to the polyethylene layer constituting the inner layer of the laminate of the present invention, the outermost polycyclic olefin copolymer-containing layer and the innermost polyethylene layer of the laminate of the present invention Are overlapped to form a container, the resulting container exhibits good sealing properties. When a container is molded using the laminate of the present invention, the container molded with the layered polycyclic olefin copolymer-containing layer has excellent shape retention. Therefore, the workmanship of the container is good. Since the outermost layer of the container wall is provided with the polycyclic olefin copolymer-containing layer, it is not always clear in theory, but the container appearance is excellent, and the tint color pattern is clearly displayed in the container from the printing layer, Therefore, the workmanship of the container is good. In particular, when a metal deposition layer is provided, the metallic luster can be satisfactorily shown in appearance. The polycyclic olefin copolymer-containing layer is not only excellent in heat resistance,
Even at a high temperature of about 130 ° C., even if a process is performed in which the containers come into contact with each other on the outer surface, no damage or heat history is observed on the outer surface of the container, and it is necessary to perform an autoclave process and a retort process. Ideal for certain packaging containers. Since the outside of the container is protected by the polycyclic olefin copolymer-containing layer, no leakage of the container occurs even at a high temperature. By making the innermost layer of the laminate of the present invention a linear low-density polyethylene layer obtained by polymerization with a metallocene catalyst,
The sealing property of a container formed by overlapping the outermost layer and the innermost layer of the package laminate can be improved. When a container is molded using the laminate of the present invention, when the linear low-density polyethylene layer obtained by polymerization with the metallocene catalyst is configured as the innermost layer, surprisingly, together with the sealing property, the container has excellent openability. ing. The polycyclic olefin copolymer of the layer constituting the container formed from the laminate of the present invention has a very good moisture barrier property, and the moisture barrier property of the container is improved.
The mechanical strength of the paper layer inside the polycyclic olefin copolymer layer can be maintained and protected. With the oxygen barrier property of the barrier layer inside the paper layer, a complete barrier function can be added to the container.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Sauvillon Anderson Asafarsa Begen 56 S-240 17 Sedra Sandby, Sweden (72) Inventor Rip Race Anna Houkas Beg 7 S-273 64 Kebulinge, Sweden F-term (reference) ) 3E067 AA03 AB01 BA06A BA12A BB01A BB15A BB25A BC03A BC06A BC10A CA30 EA06 FA01 FC01 GB06 GC01 3E086 AD01 AD02 BA04 BA13 BA14 BA15 BB90 CA11 4F100 AK01E AK02A AK02J AK04A AK04D AK04J AK08A AK08J AL01A AR00C BA04 BA05 BA07 BA10A BA10C BA10D BA10E DG10B EH66E GB15 JB16E JD01C JD04 JJ03 JK12 JN01 4J100 AA02Q AA03Q AA04Q AA07Q AA15Q AA16Q AA17Q AA19Q AA21Q AR03Q AR04Q AR05Q AR09P AR11P AS11Q CA04 DA12 FA10 JA58

Claims (9)

[Claims] 1. A packaging material paper laminate comprising at least a polycyclic olefin copolymer-containing layer outside a paper layer, and at least a barrier layer inside the paper layer and further a polyethylene layer inside the paper layer. body. 2. The packaging material sheet laminate according to claim 1, wherein the polycyclic olefin copolymer-containing layer is in contact with an outer surface of the paper layer. 3. The packaging material paper laminate according to claim 1, further comprising a polyethylene layer between said paper layer and said barrier layer. 4. The packaging material sheet laminate according to claim 1, further comprising at least a thermoplastic resin layer between the polycyclic olefin copolymer-containing layer and the paper layer. 5. The packaging paper laminate according to claim 4, wherein said thermoplastic resin layer has a metal deposition layer on one surface thereof. 6. The packaging material sheet laminate according to claim 1, further comprising a thermoplastic resin layer outside the polycyclic olefin copolymer-containing layer. 7. The packaging material paper laminate according to claim 1, wherein the polycyclic olefin copolymer is a copolymer of a cyclic olefin and ethylene or α-olefin. body. 8. The packaging material paper laminate according to claim 1, wherein the polyethylene layer is made of a linear low-density polyethylene produced by using a metallocene catalyst. 9. The packaging material sheet laminate according to claim 4, wherein said thermoplastic resin layer comprises a polyolefin layer.