JP2003001745A - Gas barrier laminated body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas barrier laminated body which has excellent gas barrier properties and through which a content can be visible and a metal detector can be used in case of examination of the content and with which temperature and humidity dependency is suppressed and which exhibits good adhesive properties and excellent processability and in addition, is friendly to environment and is used for packaging for foods and non-food applications such as medical supplies and electronic members. SOLUTION: On one face or both faces of a base material consisting of a plastic material, a gas barrier coating film layer in which an alkali metal polysilicate expressed by M2 O.nSiO2 (wherein M is Lithium or a plurality of alkali metals containing Lithium and n is molar ratio and within 1-20) is a main ingredient and a deposited layer consisting of an inorganic oxide are at least successively laminated.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a laminate for packaging used in the field of packaging non-food items such as foods and pharmaceuticals and electronic components, and has a particularly high gas barrier property,
The present invention relates to a gas barrier laminate which suppresses the permeation of oxygen and water vapor in the atmosphere and can further suppress the deterioration and alteration of the contents contained in the package produced by this laminate.

[0002]

2. Description of the Related Art In recent years, packaging materials used for packaging foods and pharmaceuticals, non-foods such as electronic components, etc., contain oxygen and water vapor in order to suppress deterioration and alteration of contents and maintain their functions and properties. In addition, it is necessary to prevent the influence of gas that deteriorates / alters the contents, and it is required to have a gas barrier property for blocking these gases.

Therefore, conventionally, as a packaging material having a gas barrier property, a metal foil made of a metal such as aluminum, a metal vapor deposition film having a vapor deposition layer thereof, a polyvinyl alcohol / ethylene vinyl copolymer or polyvinylidene chloride,
A resin film such as polyacrylonitrile or a plastic film coated with these resins has been mainly used.

[0004]

However, the metal foil and the metal vapor-deposited film have excellent gas barrier properties, but the contents cannot be seen through them, and the metal detector is used when inspecting the contents. However, there is a problem in that it must be treated as an incombustible material when it is discarded after use. In addition, gas barrier resin films and films coated with them have a high temperature-humidity dependency and cannot maintain a high level of gas barrier properties.In addition, those using vinylidene chloride, polyacrylonitrile, etc. are harmful when discarded or incinerated. There are problems such as the possibility of causing the generation of substances. That is, it can be said that the gas barrier packaging materials mainly used at present have various advantages and disadvantages.

The present invention is intended to solve the problems of the prior art as described above, and has an excellent gas barrier property, the contents can be seen through, and a metal detector can be used for inspecting the contents. , The temperature and humidity dependence is suppressed,
An object of the present invention is to provide a gas barrier laminate having good adhesion, excellent processability, and environmental friendliness, which is used for packaging food and non-food such as pharmaceuticals and electronic components.

[0006]

The present invention has been made to achieve the above object, and the invention according to claim 1 is characterized in that M _{2 is provided on} one surface or both surfaces of a substrate made of a plastic material. O.nSiO ₂ (M is lithium or a plurality of alkali metals containing lithium, n is a molar ratio in the range of 1 to 20) and a gas barrier coating layer containing an alkali metal polysilicate as a main component and an inorganic oxide A vapor barrier layered product comprising a vapor-deposited layer composed of at least one layer is sequentially laminated.

The invention described in claim 2 is the same as claim 1
In the gas barrier laminate according to the item [1], an anchor coat layer is provided between the substrate and the gas barrier coating layer.

Furthermore, the invention according to claim 3 is the gas barrier laminate according to claim 2, characterized in that the anchor coat layer contains an alkali resistant resin as a main component.

Furthermore, the invention according to claim 4 is the gas barrier laminate according to any one of claims 1 to 3, wherein the gas barrier coating layer comprises a nitrogen compound and a water-soluble polymer. It is characterized in that at least one kind of organosilicon compound is introduced.

Furthermore, the invention according to claim 5 is the gas barrier laminate according to any one of claims 1 to 4, wherein a metal alkoxide and a water-soluble resin are mainly formed on the vapor deposition layer. It is characterized in that a coating layer as a component is provided.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional configuration explanatory view showing an embodiment of the gas barrier laminate of the present invention.

The gas-barrier laminate according to the present invention comprises a substrate 1 basically made of a plastic material, on one surface (or both surfaces) of which M ₂ O.nSiO ₂ (M is lithium or a plurality of alkali metals containing lithium). , N is a molar ratio of 1 to 2
Within the range of 0), a gas barrier coating layer 3 having an alkali metal polysilicate as a main component and an inorganic vapor deposition layer 4 made of an inorganic oxide are laminated at least in sequence.

In the gas barrier laminate shown in FIG. 1, an anchor coat layer 2 is further provided between the substrate 1 and the gas barrier coating layer 3, and a coating layer 5 is provided on the vapor deposition layer 4.

Examples of the substrate 1 include polyethylene terephthalate (PET) and polyethylene naphthalate (P
EN) etc., polyester films such as polyethylene and polypropylene, polystyrene films, polyamide films such as 66-nylon, polycarbonate films, polyacrylonitrile films, engineering plastic films such as polyimide films, etc. Any of them may be used, and those having transparency, mechanical strength and dimensional stability are preferable. Of these, a film or sheet arbitrarily stretched in the biaxial direction is preferably used, and when it is further used as a packaging material, it is biaxially stretched in consideration of price, moisture resistance, filling suitability, feeling, and disposability. A polypropylene (OPP) film is more preferred.

The base material 1 made of these materials may be added with various known additives and stabilizers such as antistatic agents, plasticizers, lubricants, antioxidants and the like, or coated. Further, in order to improve adhesion with various films, corona treatment, plasma treatment, ozone treatment or the like may be performed as pretreatment, and further chemical treatment or solvent treatment may be performed.

The thickness of the substrate 1 is not particularly limited, but it is suitable as a packaging material, may be laminated with other layers, and may be an anchor coat layer 2, a gas barrier coating layer 3 and an overcoat layer which will be described later. Considering the workability when forming the coat layer 4, it is practically in the range of 3 to 200 μm, and more preferably 6 to 30 μm depending on the application.

On the other hand, the anchor coat layer 2 improves the wettability, the uniform film formability, and the adhesiveness of the gas barrier coating layer 3 provided on the base material 1 made of, for example, a plastic material, and is excellent. It is provided so that the gas barrier property can be exhibited.

The anchor coat layer 2 is preferably such that the gas barrier film layer 3 to be laminated thereon can be applied by wet coating. As the material, a material containing a resin having excellent alkali resistance as a main component is preferable. Specifically, an organic polymer obtained by a two-component reaction of a polyol with an isocyanate compound such as an acrylic polyol, polyvinyl acetal, polyester polyol, or polyurethane polyol, or an organic polymer having a urea bond by a reaction with a polyisocyanate compound and water. Compounds, polyethyleneimine or its derivatives, polyolefin emulsions, polyimides, melamines, phenols, inorganic silica such as organically modified colloidal silica, silane coupling agents, and those containing an organic silane compound such as a hydrolyzate as a main component Although any of them can be used as the anchor coating agent, those containing an organic polymer having a urethane bond and / or a urea bond are particularly preferable. Urethane bonds and urea bonds do not have ester bonds in the main chain, so they have particularly strong alkali resistance compared to other organic polymers, and because they are solvent-based, they can be dried at low temperatures and adhere well, and the water-based gas barrier properties described below. The wettability of the coating layer is also high.

The above-mentioned isocyanate compounds are generally TDI (tolylene diisocyanate), MDI (diphenylmethane diisocyanate), NDI (1,5-naphthalene diisocyanate), XDI (xylylene diisocyanate), H6XDI (hydrogenated XDI). ) Etc. and those adduct bodies and nurate bodies. Further, a urethane prepolymer having an isocyanate group at the terminal may be used. As a material for forming the anchor coat layer 2, any one of these may be used alone, or two or more kinds thereof may be mixed and used. However, considering the generation of cracks due to heat damage during drying of the gas barrier coating layer 3 laminated thereon, a TDI-based, MDI-based, XD-based coating capable of obtaining a coating having a high glass transition point is obtained.
I type and IPDI type are more preferable.

The molecular motion and contraction of the resin forming the anchor coat layer 2 due to heat can cause cracks when the gas barrier coating layer 3 is dried. Therefore, it is preferable that the resin forming the anchor coat layer 2 has a high glass transition point. Considering the drying temperature of the gas barrier coating layer 3, 3
It is more preferably 0 ° C. or higher.

For the purpose of further improving the properties of the anchor coat layer 2, well-known additives, antioxidants, weathering agents, heat stabilizers, lubricants, crystal nucleating agents, ultraviolet absorbers, coloring agents, etc. are added. It doesn't matter. For example, surfactants such as anionic activators, cationic activators, nonionic activators, amphoteric activators, silica, kaolinite, talc,
Inorganic particles such as calcium carbonate, alumina, titanium oxide, aluminum hydroxide and carbon black, organic particles such as crosslinked polystyrene and crosslinked acrylic particles, silane coupling agents and titanium coupling agents. These may contain 50% or less by weight of the additives, as long as the transparency of the anchor coat layer is not impaired. Also,
As described above, the base material 1 may be previously subjected to corona treatment, plasma treatment, ozone treatment or the like in order to improve the wettability and adhesion of the anchor coat layer 2.

The thickness of the anchor coat layer 2 is not particularly limited, but if the thickness is 0.001 μm or less, desired adhesiveness and film forming property cannot be obtained, and if it is 1 μm or more, it is uneconomical. Not preferable. Generally from 0.01 μm
The range of 1 μm is practical and preferable.

Next, the gas barrier coating layer 3 will be described.
To do. This layer provides a high degree of gas barrier properties and is temperature dependent.
It is provided for the purpose of suppressing persistence and humidity deterioration. Up
In order to achieve the above purpose, the gas barrier coating layer 3 is
It is necessary to use potassium metal polysilicate as the main component.
This alkali metal polysilicate is₂O ・ nSiO ₂
(M is lithium or a plurality of alkaline gold containing lithium
Genus, n is represented by a molar ratio of 1 to 20)
Need to be Film formation when the molar ratio is less than 1 and 20 or more
I can't. In addition, this alkali metal polysilicate
Adhesion to the vapor-deposition layer 4 described later by using the main component
It also improves the heat resistance.

Lithium polysilicate which is an essential component of the above-mentioned alkali metal polysilicate having a gas barrier property is represented by Li ₂ O.nSiO ₂ (n is a molar ratio), and its solution is generally water glass using water as a solvent. It is a so-called alkaline silicate aqueous solution. Alkali metals other than lithium, which are generally inexpensive, such as sodium and potassium, which are industrially relatively inexpensive, are commonly used as alkali metals belonging to Group 1A, but an aqueous solution of alkali silicate composed of one or more alkali metals not containing lithium. The dry coating does not provide a stable and sophisticated gas barrier function under high temperature and high humidity.For example, the sodium type does not exhibit gas barrier properties, and the potassium type does exhibit gas barrier properties, but it has high humidity due to humidity dependence. Below, the gas barrier property is reduced.

Lithium polysilicate has a gas barrier property,
It has long been known that it is particularly useful as a material for improving the oxygen barrier property. However, when a coating film is formed on a plastic film by using only lithium polysilicate, the coating film cannot be formed unless the molar ratio represented by Li ₂ O · nSiO ₂ is within the range of n ≦ 5, and the range of n ≦ 5. The lithium polysilicate film formed by the method also has a rapid shrinkage due to drying during film formation and lack of flexibility of the film itself, so that it cannot follow a flexible plastic substrate unless it is slowly dried at low temperature for a long time, and cracks occur. Damage such as (cracking) occurs and the oxygen barrier property deteriorates.

In order to further improve the film-forming property, flexibility and wettability, it is preferable that at least one or more nitrogen compounds, water-soluble polymers and organic silicon compounds are introduced into the lithium polysilicate. Examples of nitrogen compounds include ammonia, halogenated amines, metal amides, metal imines, inorganic salts such as ammonium salts and nitrates, cyanide compounds, etc., but stability, safety, environmental friendliness,
Considering the price, compatibility with an aqueous solution of alkali silicate, and the like, highly water-soluble amines are preferable. Examples thereof include ethyleneimine-based polymers such as polyamine, polyethyleneimine, and aminoethylated resin, and amine-containing silane coupling agents. In particular, since the amine-containing silane coupling agent has an alkoxysilyl group in addition to the amino group, it has good compatibility with alkali silicates and is particularly excellent in consideration of moisture absorption stability. By adding an amine compound to lithium silicate, in addition to film-forming property and flexibility, dispersibility,
Liquid stability and moisture absorption deterioration under high temperature and high humidity can be boldly improved.

The water-soluble polymer has a molecular weight of 1
000 to 400000 saccharides, polyvinyl alcohol or derivatives thereof and the like can be mentioned. The polyvinyl alcohol is obtained by polymerizing and saponifying vinyl acetate, which is a main raw material, and as the polyvinyl alcohol used in the present invention, film-forming property of the gas barrier coating layer 3,
In consideration of flexibility, compatibility, and moisture resistance, the degree of polymerization is 300 to 30.
000 and a saponification degree of 95 mol% or more are more preferable. In addition, the polyvinyl alcohol derivative may have an alkoxysilyl group, etc.
A modified polyvinyl alcohol introduced in an amount of ol% or less is included, but one having an alkoxysilyl group introduced is more preferable in view of compatibility of lithium polysilicate and prevention of deterioration due to moisture absorption.

As a method for polymerizing the alkali metal polysilicate, the organosilicon compound, the nitrogen compound and the water-soluble polymer, a well-known method can be used and it is not particularly limited. Also,
From the viewpoint of gas barrier properties, film strength, water resistance, etc., it is preferable that the weight ratio of SiO ₂ (silica component) in the alkali metal polysilicate be 40% or more of the total solid content. If the SiO ₂ (silica component) is less than 40%, the gas barrier properties inherent in lithium polysilicate will not be exhibited.

The thickness of the gas barrier coating layer 3 is generally preferably such that the thickness after drying is in the range of 0.005 to 5 μm, more preferably 0.
It is in the range of 01 to 1 μm. If it is less than 0.01 μm, it is difficult to obtain a uniform coating film from the viewpoint of coating technology.
If it exceeds, there is a problem that the coating film is easily cracked by dehydration shrinkage during drying and it is uneconomical.

In the gas barrier laminate of the present invention,
Furthermore, the anchor coat layer 2 is formed on the base material (particularly OPP base material) 1.
By further providing a vapor deposition layer 4 made of an inorganic oxide on the surface where the gas barrier coating layer 3 and the gas barrier coating layer 3 are sequentially laminated, a more excellent gas barrier property, particularly a more excellent water vapor barrier property is exhibited.
The gas barrier coating layer 3 alone exhibits a high oxygen barrier property, but by further stacking the vapor deposition layer 4 made of an inorganic oxide, the barrier layer becomes two layers, and a higher oxygen barrier property is exhibited. In addition, since the vapor deposition layer 4 made of an inorganic oxide has a high water vapor barrier property, a high water vapor barrier property is exhibited by stacking these layers.

Conventionally, when a vapor-deposited layer made of a metal or an inorganic oxide is formed on a substrate made of a plastic film to provide a gas barrier property, for example, when vapor-deposited on an OPP substrate made of a homopolymer type polypropylene alone, Adhesion at the interface with the substrate is maintained when metal aluminum is deposited, but sufficient adhesion at the interface cannot be maintained when inorganic oxides such as silicon oxide, aluminum oxide, and magnesium oxide are deposited. There is. This occurs because organic additives such as antistatic agents and slip agents that have been added to the OPP base material bleed out on the base material surface in order to exhibit the original function. That is, when an OPP base material internally added with an organic additive having a poor compatibility with polypropylene as described above is directly subjected to a vapor deposition process, the bleed-out of the additive component hinders the adhesion between the OPP base material and the vapor deposition layer, Furthermore, it will deteriorate over time. However, in the present invention, the vapor-deposited layer 4 made of an inorganic oxide is a metal polysilicate (M ₂ O · nS).
Since it is formed via the gas barrier coating layer 3 containing iO ₂ ) as a main component, it is well compatible with the inorganic oxide and has good adhesion, and does not deteriorate over time.

As the inorganic oxide constituting the vapor deposition layer 4,
Aluminum oxide (AlO _x ), silicon monoxide (Si
O) and other silicon oxides, magnesium oxide, calcium oxide, etc. can be candidates in terms of safety and raw material prices.
In particular, aluminum oxide and silicon oxide are preferable in view of heating conditions during processing and vapor deposition speed. As a method for forming the vapor deposition layer 4, so-called reactive vapor deposition or reactive sputtering, in which aluminum oxide or metal silicon is used as an evaporation material to form a thin film in the presence of a mixed gas of oxygen, carbon dioxide gas and an inert gas, etc. , A method of continuously forming a vapor deposition layer made of an inorganic oxide by reactive ion plating. Further, there is also a method in which these two methods are combined, and the film forming apparatus can be made simple and easy, which is a desirable method from the viewpoint of productivity.

Further, when a coating layer 5 composed of a metal alkoxide and a water-soluble resin is applied on the vapor deposition layer 4,
Further, the gas barrier property and the water vapor barrier property are further improved. The metal alkoxide is represented by the general formula M (OR) n such as tetraethoxysilane, triisopropoxysilane, and triisopropoxyaluminum (M is a metal such as Si, Ti, Al, or Zr, R is C
Alkyl groups such as H ₃ and C ₂ H ₅ ). Of these, tetraisopropoxysilane and triisopropoxyaluminum are preferable because they are relatively stable in an aqueous solvent after hydrolysis. Examples of the water-soluble resin include polyvinyl alcohol, polyvinylpyrrolidone, starch, methyl cellulose, sodium alginate and the like. As the coating liquid, a mixture of the water-soluble resin and the metal alkoxide, which is directly or after being subjected to a treatment such as hydrolysis, is used. The thickness after drying may be in the range of about 0.01 to 100 μm, but 50 μm
If m or more, cracks are likely to occur, so 0.01 to
It is desirable to set it to 50 μm.

As a method for forming the anchor coat layer 2, the gas barrier coating layer 3 and the coating layer 5 described above, a usual coating method can be used.
For example, dipping method, roll coating, gravure coating, reverse coating, air knife coating, comma coating, die coating, screen printing method, spray coating,
A gravure offset method or the like can be used. Using these coating methods, each layer is applied and formed on one side or both sides of the substrate 1. In this case, the anchor coat layer 2 and the gas barrier coating layer 3 may be provided separately, or both layers may be provided simultaneously by using a multicolor gravure printing machine or the like. Considering the cost, it is more preferable to form them at the same time. As a drying method, hot air drying, hot roll drying, infrared irradiation and the like are appropriately used and are not particularly limited.

An anchor coat layer 2, a gas barrier coating layer 3, a vapor deposition layer 4 made of an inorganic oxide, and a coating layer 5 made of a metal alkoxide and a water-soluble resin are laminated on the base material 1 in this order, or the laminated surface thereof. On the opposite side, a practicable layer can be provided as a packaging material. For example, it is a print layer or a heat seal layer such as a thermoplastic resin.

The heat-sealing layer is used for an adhesive portion when forming a bag-like package, and is made of, for example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer, Ethylene
It is formed of a resin such as a methacrylic acid ester copolymer, an ethylene-acrylic acid copolymer, an ethylene-acrylic acid ester copolymer and a metal cross-linked product thereof. Although the thickness is determined according to the purpose, it is generally in the range of 15 to 200 μm.

The heat-sealing layer is a dry laminate method in which a film-like material made of the above resin is attached using a two-component curing type urethane adhesive, a non-solvent dry laminating method in which it is attached using a solventless adhesive. Any of the extrusion lamination method and the like in which the resin thus obtained is melted by heating and extruded and bonded in a curtain shape can be formed by a known lamination method.

[0038]

EXAMPLES The gas barrier laminate of the present invention will be further described below with reference to specific examples.

<Preparation of anchor coat liquid> Methacrylic polyol (molecular weight 100,000, glass transition point 10
(0 ° C.) was diluted with ethyl acetate, and then a TDI-based isocyanate compound (“Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd.) was used in a solid content weight ratio of 70/30 parts and a total solid content of 5 w.
% To prepare an anchor coat liquid.

<Preparation of Gas Barrier Coating Liquid> A silane coupling agent (manufactured by Chisso Corporation) as a nitrogen compound was added to an aqueous solution of lithium silicate aqueous solution (Li ₂ O.nSiO ₂ , n = about 5 molar ratio) in which the solid content was adjusted. "Sila Ace S3
20 ″, N- (2-aminoethyl) 3-aminopropyltrimethoxysilane) is dissolved in an aqueous solution at a SiO ₂ / organosilicon compound ratio of 4/1 and stirred, and silane is used as a water-soluble polymer. Modified polyvinyl alcohol (“R-2105” manufactured by Kuraray Co., Ltd., saponification degree about 9
An aqueous solution in which 8.5 mol%) was dissolved was added and stirred to obtain a gas barrier coating liquid.

<Preparation of Coating Liquid Consisting of Metal Alkoxide and Water-Soluble Resin> Tetraethoxysilane 10.4
89.6 g of 0.1N hydrochloric acid was added to g, and the mixture was hydrolyzed by stirring for 30 minutes to obtain a hydrolysis liquid (A) having a solid content of 3 w% (SiO conversion) and polyvinyl alcohol 3 w% water / isopropyl alcohol (90/10). ) Solution (B) was mixed to obtain a liquid.

Example 1 As the base material 1, a thickness of 20 μm
Biaxially oriented polypropylene film (Santox Co., Ltd.)
"PF20" manufactured by "PF20") was coated on the corona discharge treated surface with a gravure coating machine so that the thicknesses of the anchor coating solution and the gas barrier coating solution were about 0.1 μm and 0.2 μm, respectively. A gas barrier film is formed, and silicon oxide (SiO) is vapor-deposited to a thickness of 40 nm on the coated surface by a known method using a roll-up type vapor deposition machine to form a vapor deposition layer.
A gas barrier film according to the above was obtained.

Example 2 A gas barrier film according to Example 2 was obtained in the same manner as in Example 1 except that the vapor deposition layer was formed of aluminum oxide (Al ₂ O ₃ ).

Example 3 A gas barrier film according to Example 3 was obtained in the same manner as in Example 1, except that the vapor deposition layer was formed of magnesium oxide (MgO).

Example 4 Example 1 was repeated except that a coating liquid consisting of a metal alkoxide and a water-soluble resin was applied on the vapor deposition surface by a bar coater to a thickness of 0.05 μm to form a coating layer. A gas barrier film according to Example 4 was obtained by the same method.

Example 5 A gas barrier film according to Example 5 was obtained in the same manner as in Example 4, except that the vapor deposition layer was formed of aluminum oxide (Al ₂ O ₃ ).

Example 6 A gas barrier film according to Example 6 was obtained in the same manner as in Example 4, except that the vapor deposition layer was formed of magnesium oxide (MgO).

Comparative Example A gas barrier film according to a comparative example was obtained in the same manner as in Example 1 except that the anchor coat layer and the gas barrier coating layer were omitted.

<Evaluation> In each of the films of Examples and Comparative Examples, (1) Oxygen permeability (cm ³ / m ² · day · a)
tm) (2) Water vapor transmission rate (g / m ² · day) (3)
The cellophane tape adhesion was evaluated.

(1) Oxygen permeability Oxygen permeability measuring device (OXT manufactured by Modern Control Co., Ltd.)
RAN-10 / 50A), 30 ° C relative humidity 70
% In the atmosphere.

(2) Water vapor permeability Oxygen permeability measuring device (PAR manufactured by Modern Control Co., Ltd.
MATRAN-W600), 40 ° C relative humidity 9
It was measured in an atmosphere of 0%.

(3) Cellophane Tape Adhesive A cellophane tape was attached to the film-forming surface and then peeled off, and it was visually observed whether the film was peeled off.

The results are shown in Table 1.

[0054]

[Table 1]

In the comparative example, since the anchor coat layer and the gas barrier coating layer were not provided, there was almost no oxygen barrier property and the adhesion was poor. Moreover, only the water vapor barrier property of OPP itself is exhibited. In comparison with this, in Examples, the anchor coat layer and the gas barrier coating layer exhibit high oxygen barrier properties, and the inorganic vapor deposition layer also exhibits high water vapor barrier properties. Further, the adhesion between the layers is also good.

[0056]

As described above, according to the present invention, M ₂ O.
The gas barrier coating layer containing an alkali metal polysilicate represented by nSiO ₂ (M is lithium or a plurality of alkali metals containing lithium, n is in a molar ratio of 1 to 20) as a main component, and an inorganic oxide is further formed. By providing a vapor deposition layer, it becomes possible to form a gas barrier laminate having good oxygen barrier properties, water vapor barrier properties, and adhesion, and using this, printing processes, Dry lamination, melt extrusion lamination, thermocompression lamination, etc. After the post-processing, it is possible to provide a packaging material having a wide range of practical use, which is used for packaging foods, pharmaceuticals, non-foods such as electronic components and the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration explanatory view showing an outline of a gas barrier laminate of the present invention.

[Explanation of symbols]

1 ... Base material 2 ... Anchor coat layer 3 ... Gas barrier coating layer 4 ... Deposition layer 5 ... Coating layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Suzuki             1-5-1 Taito, Taito-ku, Tokyo Toppan stamp             Imprint Co., Ltd. F-term (reference) 3E086 BA04 BA13 BA15 BA24 BB01                       BB02 BB05 BB72 CA01 CA28                       CA31                 4F100 AA17B AA17C AA17E AA20B                       AA33B AH06B AK01A AK01B                       AK01D AK01E AL05B BA03                       BA04 BA05 BA07 BA10A                       BA10C BA10E CC00E EH66C                       EJ65D GB15 GB23 JB05B                       JB05E JD02B JL11 JN01                 4J038 AA011 BA012 BA092 BA112                       CE022 CK032 DJ012 DL021                       DL031 DM021 HA316 HA336                       HA456 JB01 JB12 JC35                       NA08 PA12 PB04 PC08

Claims (5)

[Claims] 1. M ₂ O.nSiO ₂ (M is lithium or a plurality of alkali metals containing lithium, and n is a molar ratio of 1 to 20) on one or both sides of a substrate made of a plastic material.
The gas barrier layered product having a gas barrier coating layer containing an alkali metal polysilicate as a main component and a vapor deposition layer formed of an inorganic oxide are laminated at least in sequence. 2. An anchor coat layer is provided between the base material and the gas barrier coating layer.
The gas barrier laminate according to. 3. The gas barrier laminate according to claim 2, wherein the anchor coat layer contains an alkali resistant resin as a main component. 4. A nitrogen compound, a water-soluble polymer, and an organosilicon compound are contained in the gas barrier coating layer in an amount of at least 1.
The gas barrier laminate according to any one of claims 1 to 3, wherein at least one kind is introduced. 5. The gas barrier property according to claim 1, wherein a coating layer containing a metal alkoxide and a water-soluble resin as a main component is provided on the vapor deposition layer. Laminate.