JP2001138428A - Packaging material laminate and package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material laminate having excellent hermetic sealability usually but having no strong resistance and a good opening feeling at the time of opening, capable of being smoothly opened by a hand and having gas barrier properties and easy opening properties, and a package excellent in opening properties using the packaging material laminate. SOLUTION: A packaging material laminate is constituted by forming an inorganic oxide membrane layer on at least one surface of a plastic film and providing a layer wherein a crosslinking agent is mixed with more than one kind of an anchor coat agent on the inorganic oxide membrane layer and further providing a heat-sealable resin layer on the surface of this layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material laminate and a packaging material, and more particularly to a plastic film having an inorganic oxide thin film layer formed thereon.
Packaging laminates and packaging suitable for use in packaging articles that require airtightness when packaging pharmaceuticals, chemicals, medical equipment, electronic components, etc., and that require easy opening when removing contents It is about the body.

[0002]

2. Description of the Related Art Conventionally, a gas barrier laminate having an inorganic oxide thin film formed on a plastic film has been known as a transparent film having excellent gas barrier properties against oxygen and water vapor, and having a small environmental load. ing. Such a gas-barrier laminate further laminated with a heat-sealing resin layer is used for food, medicine,
Make bags for packaging chemicals, medical equipment, electronic components, etc.
Used as a package.

[0003] However, when the contents are taken out from the outer packaging of the packaging bag or the article, the outer packaging of the packaging bag or the article is opened. There are packaging bags and articles that cannot be easily opened by the power of the elderly or children, and when they are opened with more force, the content jumps out of the packaging bags and articles at once because of the strong momentum. May fly. For this reason, for the packaging of food or the like made of the packaging material and the exterior of articles, a means for adjusting the adhesive strength is used as a means for adjusting the ease of opening. For example, there is a method in which a polyethyleneimine-based anchor coating agent is laminated on the inorganic oxide thin film layer to improve the adhesive strength with the heat seal layer. When used in applications where water adheres to the parts, there has been a problem that the adhesive strength is reduced and the openability is also reduced.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional packaging material laminate and package, and usually has excellent airtightness. It is an object of the present invention to provide a packaging material laminate that has good gas barrier properties, can be opened smoothly by hand, has excellent openability, and has excellent openability using the packaging material laminate. And

[0005]

In order to achieve the above-mentioned object, a packaging material laminate and a packaging body according to the present invention are provided with an inorganic oxide thin film layer formed on the surface of a plastic film, A packaging material laminate is characterized in that a layer in which a crosslinking agent is mixed with one or more anchor coating agents is formed on the surface, and a heat-sealable resin layer is provided on the surface of the layer.

In this case, it is preferable that the method for providing the heat-sealing resin layer is an extrusion lamination method.

In this case, it is preferable that the layer in which the crosslinking agent is mixed with the anchor coating agent is a reaction product of polyethyleneimine and an epoxy compound.

Furthermore, in this case, it is preferable that the inorganic oxide thin film layer is a multi-component inorganic oxide thin film containing at least silicon oxide and aluminum oxide.

Furthermore, in this case, it is preferable that the plastic film is a biaxially stretched nylon film.

Furthermore, in this case, it is possible to use the packaging material laminate described above.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a packaging material laminate and a package of the present invention will be described.

The plastic film in the present invention is a film made of an organic polymer resin, which is melt-extruded, stretched in a longitudinal direction and / or a width direction, and further subjected to heat setting and cooling. , Polyethylene, polypropylene, polyethylene terephthalate, polyethylene-2,6-naphthalate, nylon 6, nylon 4, nylon 66, nylon 12, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, wholly aromatic polyamide, polyamide imide, polyimide, Examples include polyetherimide, polysulfone, and the like. These organic polymers may be copolymerized or blended with a small amount of another organic polymer.

Among these, specific examples of preferable polyamides include polycaproamide (nylon 6), poly-ε-aminoheptanoic acid (nylon 7), poly-ε-aminononanoic acid (nylon 9), polyundecaneamide (Nylon 11), polylaurin lactam (nylon 1
2), polyethylene diamine adipamide (nylon 2,
6), polytetramethylene adipamide (nylon 4,
6), polyhexamethylene adipamide (nylon 6
6), polyhexamethylene sebacamide (nylon 6.1
0), polyhexamethylene dodecamide (nylon 6.1
2), polyoctamethylene dodecamide (nylon 6.1
2), polyoctamethylene adipamide (nylon 8
6), polydecamethylene adipamide (nylon 10
6), polydecamethylene sebacamide (nylon 10.1)
0), polydodecamethylene dodecamide (nylon 12
12), meta-xylene diamine-6 nylon (MXD
6) and the like, and copolymers containing these as main components may be used. Examples thereof include caprolactam / laurin lactam copolymer, caprolactam / hexamethylene diammonium adipate copolymer, Laurin lactam / hexamethylene diammonium adipate copolymer, hexamethylene diammonium adipate /
Hexamethylene diammonium sebacate copolymer, ethylene diammonium adipate / hexamethylene diammonium adipate copolymer, caprolactam / hexamethylene diammonium adipate / hexamethylene diammonium sebacate copolymer, etc. be able to. It is also effective to mix these polyamides with plasticizers such as aromatic sulfonamides, p-hydroxybenzoic acid, and esters, as well as elastomer components having a low modulus of elasticity, and lactams, as film flexibility modifying components. is there.

As specific examples of preferred polyesters, polyethylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, etc. are used. When a polymer is used, the main component of the dicarboxylic acid component is an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid, phthalic acid or 2,6-naphthalenedicarboxylic acid, and a polyfunctional carboxylic acid such as trimellilotic acid and pyromellilotic acid. In addition, aliphatic dicarboxylic acids such as adipic acid and sebacic acid are used.
The main component of the glycol component is ethylene glycol or 1,4-butanediol, aliphatic glycols such as diethylene glycol, propylene glycol, neopentyl glycol, aromatic glycols such as p-xylylene glycol, and 1,4-cyclohexane. Alicyclic glycols such as dimethanol, having an average molecular weight of 150 to 2
For example, 0000 polyethylene glycol is used.
The preferable proportion of the copolymer component in the polyester is 20% or less. When the amount of the copolymer component exceeds 20%, the film strength, transparency, heat resistance and the like may be poor. These organic polymers may be copolymerized or blended with another organic polymer in a small amount.

Further, known additives such as an ultraviolet absorber, an antistatic agent, a plasticizer, a lubricant, and a coloring agent may be added to the organic polymer, and the transparency as a film is particularly limited. However, when used as a transparent packaging material laminate, one having a transmittance of 50% or more is desirable. Plastic film in the present invention, as long as the object of the present invention is not impaired, prior to laminating a thin film layer, corona discharge treatment of the plastic film, glow discharge, flame treatment,
A surface treatment such as a surface roughening treatment may be performed, and a known anchor coating treatment, printing, and decoration may be performed. The thickness of the plastic film in the present invention is preferably in the range of 3 to 500 μm, and more preferably in the range of 6 to 300 μm.

The inorganic oxide thin film in the present invention is not particularly limited as long as it can be formed into a thin film such as silicon oxide, aluminum oxide, and magnesium oxide, but is more preferably a multi-component inorganic oxide thin film containing silicon oxide and aluminum oxide. Is more excellent in gas barrier properties. Here, silicon oxide, a multi-component inorganic oxide thin film containing aluminum oxide is a thin film formed by a method known per se from an inorganic oxide, and an inorganic oxide is silicon oxide, aluminum oxide, There is no particular limitation as long as the inorganic oxide can be formed into a thin film such as magnesium oxide. Preferred inorganic oxides are aluminum oxide, a multi-component inorganic oxide thin film containing silicon oxide, more preferably a binary inorganic oxide containing silicon oxide and aluminum oxide. It is an object thin film. Here, silicon oxide means S
i, made of a mixture of various silicon oxides such as SiO and SiO ₂ , and aluminum oxide is Al, AlO, Al
Consisting of a mixture of various aluminum oxides such as ₂ O ₃ ,
The amount of oxygen bonded in each oxide varies depending on the respective manufacturing conditions. When silicon oxide and aluminum oxide are used in combination, the content of aluminum oxide in the inorganic oxide thin film is 20 to 99% by weight. Is preferably 20 to 75% by weight.

The relation between the value of the specific gravity of the inorganic oxide thin film and the content (% by weight) of aluminum oxide in the inorganic oxide thin film is represented by D = 0.01A + b (D: specific gravity of the thin film, A : Weight% of aluminum oxide in the thin film), when the b value is less than 1.6, the structure of the silicon oxide / aluminum oxide based thin film becomes coarse, and the b value is less than 2.2. In the case of a large area, the silicon oxide / aluminum oxide based thin film tends to be hard.

For this reason, the specific gravity of the silicon oxide / aluminum oxide based thin film as the inorganic oxide thin film depends on the specific gravity of the thin film and the content (% by weight) of aluminum oxide in the thin film.
When expressed by a relational expression of 0.01A + b (D: specific gravity of the thin film, A: content of aluminum oxide in the thin film), the b value is preferably 1.6 to 2.2, more preferably 1 to 2.2. 0.7 to 2.1, but of course is not limited to this range. A multi-component inorganic oxide thin film containing silicon oxide / aluminum oxide and further containing another inorganic oxide also has a large effect as a gas barrier laminate.

In the above case, if the content of aluminum oxide in the silicon oxide / aluminum oxide binary inorganic oxide thin film is less than 20% by weight, the gas barrier property is not always sufficient, and the silicon oxide / oxide If the amount of aluminum oxide in the aluminum-based binary inorganic oxide thin film exceeds 99% by weight, the flexibility of the vapor-deposited film is reduced, and it is relatively weak to bending and dimensional change of the gas barrier laminate, and the effect of the combination of the two is used. Problem may occur.

In the present invention, the thickness of the inorganic oxide thin film is usually from 10 to 8,000, preferably from 50 to 50,000.
00 °. If the film thickness is less than 10 °, it is difficult to obtain a satisfactory gas barrier property, and if the film thickness exceeds 8,000 °, the effect of improving the gas barrier property cannot be obtained. It is disadvantageous in terms of cost.

A typical manufacturing method for forming an inorganic oxide thin film will be described by forming a silicon oxide / aluminum oxide based thin film.
A physical vapor deposition method such as a sputtering method or an ion plating method, or a CVD method (chemical vapor deposition method) is appropriately used. For example, when a vacuum deposition method is employed, a mixture of SiO ₂ and Al ₂ O ₃ or SiO ₂
And a mixture of Al and the like. For heating, resistance heating, high-frequency induction heating, electron beam heating, etc. can be adopted. In addition, oxygen, nitrogen, hydrogen, argon, carbon dioxide gas, water vapor, etc. are introduced as reaction gas, ozone addition, ion assist It is also possible to employ reactive vapor deposition using such means. Further, film forming conditions such as applying a bias to the plastic film, heating and cooling the plastic film, and the like can be arbitrarily changed. The above-described deposition material, reaction gas, substrate bias, heating / cooling, and the like can be similarly changed when a sputtering method or a CVD method is adopted.

By such a method, various treatments such as boiling treatment and retort treatment, which are transparent and excellent in gas barrier property,
Further, it is possible to obtain a packaging material laminate and a packaging body having excellent performance that can withstand a gelbo test (flex resistance test). Such a gas barrier laminate in which an inorganic oxide thin film layer is formed on the surface of a plastic film is at least a part of the constituent layer of the packaging material laminate of the present invention. Further, the packaging material laminate of the present invention uses a plurality of gas barrier laminates in which an inorganic oxide thin film layer is formed on at least one surface of a plastic film, and a titanium oxide layer is formed on the surface of the thin film layer. The basic structure of a packaging material laminate in which a heat-sealing resin layer is directly provided on the surface of the titanium oxide layer by melt extrusion lamination is not limited thereto without departing from the gist of the present invention.

The heat-sealable resin layer in the present invention includes low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE),
Linear low density polyethylene (LLDPE), ethylene vinyl acetate copolymer (EVA), polypropylene (PP),
Ethylene / acrylic acid copolymer (EAA), ethylene / acrylic acid
Methacrylic acid copolymer (EMA), ethylene / methyl acrylate copolymer (EMAA), ethylene / ethyl acrylate copolymer (EEA), ethylene / methyl methacrylic acid copolymer (EMMA), ionomer (I
O) is a resin layer having heat sealability formed by O. Practically, low-density polyethylene, ethylene-vinyl acetate copolymer, and linear low-density polyethylene are often used as a resin layer by melt extrusion. The thickness of the melt extruded fat layer is about 3 to 100 μm, preferably 1 to 100 μm.
It is generally about 0 to 70 μm. In the present invention, a resin having heat sealing properties can be further laminated on the melt-extruded resin layer. As such a heat-sealable resin, the heat-sealable resin layer in the present invention may be a low-density polyethylene (LDPE), a medium-density polyethylene (MDPE), or a high-density polyethylene (HDP).
E), linear low density polyethylene (LLDPE), ethylene vinyl acetate copolymer (EVA), polypropylene (P
P), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMA), ethylene
Methyl acrylate copolymer (EMAA), ethylene
Examples include films formed from ethyl acrylate copolymer (EEA), ethylene / methyl methacrylic acid copolymer (EMMA), ionomer (IO), and the like.

In the present invention, the layer obtained by mixing a crosslinking agent with one or more anchor coating agents has a thickness of 0.001 to 1
When it is provided as an anchor coat layer in a melt extrusion lamination method, it is 0.003 to 5 μm.
About μm is desirable. Examples of the anchor coating agent include a polyethyleneimine derivative. The ratio of the polyethyleneimine derivative in the layer obtained by mixing the crosslinking agent with the one or more anchor coating agents is 10% to 100%.
% Is desirable, more preferably 30% to 100%, and still more preferably 50% to 100%. Polyethyleneimine derivatives are polyethyleneimines copolymerized with other components by a general method, or aldehydes, ketones, alkyl halides, isocyanate compounds, epoxy compounds, guanidines, ureas, and various acids. And a reaction product with a compound selected from the group consisting of acid anhydrides and the like, or a grafted product of a vinyl compound. Polyethyleneimine is a polymer of ethyleneimine, a highly reactive water-soluble polymer having an amino group having a three-membered ring structure, and having a molecular weight of 100 to 1
Those having about 00000 and an amine value of about 20 are generally used. It has been known that polyethyleneimine has been conventionally used as an anchor coating agent in melt extrusion lamination, and that a small amount can provide strong adhesive strength. However, there is also a disadvantage that when water adheres to the bonding portion, the bonding strength is reduced. The polyethyleneimine derivative-based anchor coating agent is used by diluting an aqueous solution of a polyethyleneimine derivative to a concentration which is a mixture of water and alcohol. As a crosslinking agent at this time,
Examples include, but are not limited to, polyisocyanate compounds, polyepoxy compounds, methylol melamine, and dimethylol ethylene urea.

In the present invention, when the packaging material and the packaging body composed of the packaging material laminate are classified by type for the food packaging, first of all, according to the food to be stored, it is convenient for dry food, water food, frozen food and the like. Can be divided. Furthermore, the packaging material and package for dried foods are used for the following applications. Applicable contents include snacks such as potato chips and popcorn, rice crackers such as rice crackers and oysters, instant noodles, sprinkles, and shavings. Dry goods such as laver, green tea, coffee,
There are luxuries such as tea, and grains such as flour, rice, and barley, and are not limited thereto.

As the packaging material for dried foods, various films and papers may be used to laminate the packaging material laminate of the present invention according to the requirements of the contents to be packaged. Biaxially stretched polyethylene terephthalate film / inorganic oxide thin film layer / polyethyleneimine derivative layer / polyethylene, biaxially stretched polyethylene terephthalate film / inorganic oxide thin film layer / polyethyleneimine derivative layer / unstretched polypropylene, biaxially stretched nylon film / biaxial Stretched polyethylene terephthalate / inorganic oxide thin film layer / polyethyleneimine derivative layer / polyethylene, biaxially stretched nylon film / inorganic oxide thin film layer / polyethyleneimine derivative layer / polyethylene, etc. can be considered. Furthermore, it may be subjected to printing for explanation of decoration or contents, or may be bonded to a design film or a reinforcing agent.

The package for dried food in the present invention includes bags, lids, cups, tubes, standing packs, trays, and the like. There are no particular restrictions on the shape and type of the package. , A pillow type, a three-side seal, a four-side seal, or the like can be used. The packaging material laminate of the present invention is used as all or a part of the configuration of these packaging materials and packages.

The contents applicable to the packaging material for water-based foods and the package in the present invention include various pickles such as board / yarn konjac, takuan, soy sauce pickles, and nara pickles, various miso pastes and sauces. There are, but are not limited to, foodstuffs, soy sauce, sauces, ketchup, mayonnaise, and other seasonings that are enclosed with dashi, mentsuyu and the like.

Various types of films may be laminated according to the required characteristics of the contents to be packaged as a packaging material for aquatic foods. Typical laminating structures include biaxially stretched nylon film / inorganic oxide thin film layer / polyethylene. Imine derivative layer /
Polyethylene, biaxially stretched nylon film / inorganic oxide thin film layer / polyethyleneimine derivative layer / undrawn polypropylene, biaxially stretched polyethylene terephthalate film / machine oxide thin film layer / polyethyleneimine derivative layer / polyethylene, biaxially stretched polyethylene terephthalate film / Inorganic oxide thin film layer / Polyethyleneimine derivative layer /
Unstretched polypropylene and the like can be considered. Furthermore, it may be subjected to printing for explanation of decoration or contents, or may be bonded to a design film or a reinforcing agent.

The package for aquatic foods in the present invention includes bags, lids, cups, tubes, standing packs, trays, and the like. There are no particular restrictions on the shape and type of the package. , Pillow type,
A three-sided seal, a four-sided seal, or the like can be used, and the packaging material laminate of the present invention is used as all or a part of the configuration of these packaging materials and packaging bags. The packaging material and the packaging body having the packaging material laminate of the present invention as a part or the whole of the configuration have a wide use temperature range, and thus can be applied to frozen foods.

Next, the packaging material laminate and the package in the present invention can be classified into uses such as paper cartons, tubes, bags, cups, standing packs, and trays by shape. For example, a paper carton refers to a composite container, and as a packaging material for a paper carton, a laminate of paper, a plastic film, or the like and a gas barrier film is used. Roof shape (gebelle top: gable
top), brick type (brick type: bricktype)
e), a rectangular shape, a cup type and the like are not particularly limited. Moreover, you may combine with an inner bag, a spout, etc. Contents that can be applied as a paper carton application in the present invention include milk,
There are drinks such as yogurt juice and carbonated drinks, alcohols such as sake, shochu and whiskey, and seasonings such as soy sauce and sauces, but are not particularly limited thereto.

Next, as another usage example of the packaging material laminate and the packaging body in the present invention, it can be used also as a packaging material and a packaging body for a microwave oven or micro-sterilization utilizing its non-conductivity. It is also used as a packaging material containing an oxygen scavenger. Similarly, there are various types of laminate configurations and shapes of the package. The packaging material of the present invention and the packaging material laminate constituting the package are transparent and have high barrier properties. That is, although it depends on the type and thickness of the resin used as the heat sealing layer, for example, an unstretched polypropylene film (thickness 5)
0 μm), the oxygen permeability is 3.0 cc / m ^2.
24 hrs · atm or less and water permeability of 3.0
It has an excellent barrier property of not more than g / m ² · 24 hrs.
Therefore, the food packaged with the packaging material comprising the packaging material laminate of the present invention can be stored for a long time. Further, the packaging material comprising the packaging material laminate of the present invention does not have a strong resistance at the time of opening and has a good opening feeling and can be opened smoothly. The opening property in the present invention means that the heat-sealing resin layers are heat-sealed with each other. A notch 2 having a length of 4 mm was inserted into the end 3 of the portion, the both ends of the notch of the sample were gripped, and the sample was torn by the following two methods, and the resistance at that time was distinguished in four stages. Cross method: Both ends of the notch are pulled in the direction perpendicular to the film surface. Tear method: Both ends of the notch are pulled in a Y-shape parallel to the film surface. The oxygen barrier property is measured according to the JIS K7126 B method using an oxygen permeability measuring device (OX manufactured by Modern Controls).
-TRAN2 / 20). The adhesive strength was measured between the inorganic oxide thin film layers by 90 in accordance with JIS K6854.
The SS curve at the time of peeling was measured by Tensilon (UTM2 manufactured by Toyo Sokki Co., Ltd.).

[0033]

EXAMPLES Hereinafter, the contents and effects of the present invention will be described specifically with reference to examples, but the present invention is not limited to the following examples unless departing from the gist thereof.

[0034]

Example 1 A 15 μm-thick film (VN100, manufactured by Toyobo Co., Ltd.) obtained by depositing a binary oxide thin film of silicon oxide and aluminum oxide on a biaxially stretched nylon film (N4142, manufactured by Toyobo Co., Ltd.) )
Extrusion Laminator (Modern Machinery) Speed 80m
/ min, a polyethyleneimine-based anchor coat agent (manufactured by Nippon Shokubai Kogyo Co., trade name P1
000) to which 3% by weight of an epoxy compound (manufactured by Dainippon Ink and Chemicals, trade name: CR-5L) was added. The anchor coating agent was diluted with isopropyl alcohol so that the solid content concentration became 2%. This diluent was applied with a bow roll so that the amount of application when dried was 0.03 g / m ² . On this anchor coat layer, a linear low-density polyethylene film (40 μm thick) was used as a heat-sealable resin.
m) (Toyobo Co., Ltd., trade name: L4102), low-density polyethylene extruded at a resin temperature of 315 ° C. with a thickness of 15 μm (Sumitomo Chemical Co., Ltd., trade name: Sumikasen L70)
Adhered in 5). The gap with the chill roll at that time was 15 mm. Thus, a laminate having a three-layer structure was obtained by extrusion lamination. Although this laminate had a high adhesive strength immediately after extrusion lamination, it was subjected to aging at 40 ° C. × 1 day just in case. While measuring the oxygen barrier of the obtained extruded laminate, heat sealing (seal condition: 160 ° C. × 2 kg × 2 seconds) was performed.
I made a packaging bag. When the cut property of this bag was evaluated, both the cloth method and the tearing method were good and cut cleanly.
The adhesive strength was 700 g / 15 mm or more, which was very good. This sample was stored in an environment of 35 ° C. × 90% RH for 3 days, and after having absorbed moisture, the adhesive strength and the opening property were measured once again, and were good.

[0035]

[Comparative Example 1] An isocyanate-based adhesive (manufactured by Toyo Morton Co., Ltd. under the trade name EL)
530 A / B: 0.2 g / m ² )
To obtain an extruded laminate. When the oxygen barrier property, adhesive strength and openability of this laminate were evaluated in the same manner as in Example 1, the adhesive strength was as low as 120 g / 15 mm.

[0036]

Comparative Example 2 An extruded laminate was obtained by processing in the same manner as in Example 1 except that the anchor coating agent for the extrusion laminate was a polyethyleneimine-based anchor coating agent (trade name: P1000, manufactured by Nippon Shokubai Kogyo Co., Ltd.). . About this laminated body, oxygen barrier property, adhesive strength,
When the openability was evaluated, the properties before moisture absorption were good, but the adhesive strength after moisture storage after storage for 3 days in an environment of 35 ° C. × 90% RH was as low as 100 g / 15 mm. With a strong sense of resistance, it did not cut well.

[0037]

Example 2 A biaxially stretched nylon film (manufactured by Toyobo Co., Ltd., trade name N4142) was used to deposit a binary oxide thin film of silicon oxide and aluminum oxide to a thickness of 15 μm. Polyethyleneimine anchor coating agent (Toyo Morton Co., Ltd., trade name
AD372MW) to obtain an extruded laminate having a three-layer structure in the same manner as in Example 1 except that 3% by weight of glycently glycidyl ether (manufactured by Nagase Kasei Co., Ltd.) as an epoxy compound was added. . About the obtained laminated body, oxygen barrier property,
The adhesive strength and openability were evaluated. The openability of the cloth method and the tearing method is good before and after moisture absorption, and the adhesive strength is 7
00g / 15 mm or more, which was sufficiently strong.

[0038]

Example 3 Using a film obtained by evaporating an aluminum oxide thin film on a biaxially stretched nylon film (manufactured by Toyobo Co., Ltd., trade name: N4142), a polyethyleneimine-based anchor coating agent (manufactured by Dainichi Seika Co., Ltd .;
Product name Secadyne 4100) and isocyanate compound (Daiichi Kogyo Seiyaku Co., Ltd., product name Elastron E-3)
7) was added and the isocyanate-crosslinked anchor coat layer was dried at a coating amount of 0.03.
g / m ² . On this anchor coat layer, a low-density polyethylene (trade name: Sumikasen L705, manufactured by Sumitomo Chemical Co., Ltd.) was extruded as a resin having a thickness of 25 μm as a heat-sealing resin. Here, a linear low-density polyethylene film (thickness: 40 μm) (manufactured by Toyobo Co., Ltd.,
A laminate having a two-layer structure was prepared without using the product name L4102). This laminate was not aged since the initial stage of extrusion lamination because of its high lamination strength. When each evaluation was similarly performed on the obtained laminate, the opening property was good before and after moisture absorption in both the cloth method and the tearing method, very good, and the adhesive strength was 7 or more.
It was 00 g / 15 mm or more, which was very good.

[0039]

[Comparative Example 3] Anchor coating agent for extrusion lamination was polyethyleneimine-based anchor coating agent (manufactured by Dainichi Seika Co., Ltd.
Example 3 except that the product name is Secadyne 4100)
To obtain an extruded laminate. The laminate was evaluated for oxygen barrier properties, adhesive strength, and openability in the same manner as in Example 1. As a result, the properties before moisture absorption were good, but the laminate was stored in an environment of 35 ° C. × 90% RH for 3 days. The adhesive strength after moisture absorption was as low as 80 g / 15 mm.

Table 1 shows the properties of the obtained laminate.

[0041]

[Table 1]

[0042]

According to the packaging material laminate and package of the present invention, they have excellent gas barrier properties and excellent airtightness, but they do not have a strong resistance upon opening and have a good opening feeling. It can be opened smoothly.

[Brief description of the drawings]

FIG. 1 is a view showing a main part of a heat seal portion of a packaging material laminate of the present invention, in which a cutout portion is formed.

[Description of Signs] 1 Packaging material laminate 2 Notch 3 Heat seal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masanori Kobayashi 2-1-1 Katata, Otsu City, Shiga Prefecture Inside Toyobo Co., Ltd. Research Institute (72) Inventor Hirohisa Fujita 17-19 Nihonbashi Koamicho, Chuo-ku, Tokyo No. Toyo spinning Co., Ltd., Tokyo branch in the F-term (reference) 3E067 AA03 AA04 AA11 AB01 AB16 AB21 AB24 AB26 AB28 AB41 AB81 AB83 AB96 BA07A BA10A BA14A BB14A BB15A BB16A BB18A BB25A BC07A CA04 CA24 EA06 EA08 EA09 EB07 FB07 4F100 AA17B AA17C AA19B AA19C AA20B AA20C AH03D AH03E AK01A AK48A AK53D AK53E AK63 AR00E BA03 BA04 BA05 BA06 BA07 BA13 CA02D CA02E CA30D CA30E EH66 EJ38A GB15 JD02 JL13E JM02B JM02C

Claims (6)

[Claims] An inorganic oxide thin film layer is formed on at least one surface of a plastic film, and a layer in which a crosslinking agent is mixed with one or more anchor coating agents is provided on the surface of the inorganic oxide thin film layer. A packaging material laminate comprising a heat-sealing resin layer provided on the surface of the layer. 2. The packaging material laminate according to claim 1, wherein the method for providing the heat-sealing resin layer is a melt extrusion lamination method. 3. A packaging material laminate according to claim 1, wherein the layer obtained by mixing the crosslinking agent with the at least one anchor coating agent according to claim 1 is a layer comprising a mixture of polyethyleneimine and an epoxy compound. 4. A packaging material laminate according to claim 1, wherein said inorganic oxide thin film is a multi-component inorganic oxide thin film containing at least silicon oxide and aluminum oxide. 5. A packaging material laminate according to claim 1, wherein the plastic film is a biaxially stretched nylon film. 6. A package comprising the packaging material laminate according to claim 1, 2, 3, or 4.