JP2001088260A - Laminate of polyamide film easy to cut and package body using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate of a polyamide film having gas barrier proper ties and easy to cut. SOLUTION: The laminate has a polyolefin resin layer 3 with heat-sealability stacked via a two-component setting type urethane adhesive 2 to at least one surface of a polyamide film 1 processed to have gas barrier properties. The laminate of the polyamide film is easy to cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging film which may be used as a boil for liquid soups, soups, sauces and the like used in instant foods and the like. Related to the packaging field.

[0002]

2. Description of the Related Art The required quality of packaging materials used for packaging materials for liquid soups is that oxygen, water vapor, and other contents that permeate the packaging materials in order to suppress deterioration of the contents and maintain their functions and properties. It is necessary to prevent the influence of the gas which alters the gas, and it is required to have a gas barrier property for blocking the gas. Furthermore, in order to respond flexibly to the liquid as the contents and to make it easy to take out, it was necessary to be soft and easy to cut. Conventionally, since the content is a liquid, a polyamide film, which is the most flexible and easy to cut among plastic materials, is used as the base material, and the polymer resin composition has relatively excellent gas barrier properties. In general, those coated with a vinylidene chloride resin and those laminated with a metal foil made of a metal such as aluminum have been used.

However, those coated with a vinylidene chloride resin are largely dependent on temperature and humidity and cannot maintain gas barrier properties. And since it is a resin system containing chlorine, there is a problem that it is difficult to use due to a recent dioxin problem. In addition, packaging materials using metal foil such as aluminum have excellent gas barrier properties, but the contents cannot be checked through the packaging material, and must be treated as incombustibles when disposed after use. At the time of inspection, there is a problem in that a metal detector cannot be used and the like.

Therefore, as a packaging material which overcomes these drawbacks, for example, US Pat. No. 3,442,686, JP-B-63-1988.
Silicon oxide as described in No. 28017, etc.,
2. Description of the Related Art Films have been developed in which an inorganic oxide such as aluminum oxide is formed on a polymer film such as a polyamide film by a forming method such as a vacuum evaporation method or a sputtering method. These deposited films are transparent and oxygen,
It is known to have a gas barrier property against water vapor and the like, and is considered to be suitable as a packaging material having both transparency and gas barrier properties which cannot be obtained with metal foil or the like.

[0005]

However, even a film suitable for the above-mentioned packaging material is rarely used as a vapor deposition film alone as a packaging container or a packaging material. None of the adhesive and sealant combinations met the required easy-cut properties.

[0006] The most common laminate is a dry laminate, but a polyester-based urethane resin generally used as an adhesive for dry lamination does not show easy cutting properties, and is not easily cut to a substrate by a sealant. The adhesion strength changes greatly.

[0007]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 is to provide a gas barrier treated polyamide film on at least one side with a two-component curable urethane adhesive. And a laminated body of an easily cut polyamide film, wherein a polyolefin resin layer having heat sealing properties is laminated.

[0008] The invention of claim 2 provides an undercoat layer having a thickness of 5 to at least one side of the polyamide film.
An inorganic oxide thin film layer having a gas barrier property of an inorganic oxide having a thickness of 300 nm, an aqueous solution containing a water-soluble polymer and at least one of (a) one or more metal alkoxides and a hydrolyzate thereof, or (b) tin chloride; A heat-sealing polyolefin is applied to a gas-barrier-treated polyamide film obtained by sequentially laminating a gas-barrier coating layer coated with a coating agent mainly composed of a water / alcohol mixed solution via a two-component curable urethane adhesive. A laminated body of an easily cut polyamide film characterized by laminating base resin layers.

Further, the invention according to claim 3 is characterized in that the adhesive is
Liquid curing type polyether urethane adhesive, NCO
3. The laminate of claim 1, wherein the ratio of groups / OH groups is 2 or more.

The invention of claim 4 is characterized in that the viscoelasticity of the two-component curable polyether-based urethane adhesive is 8.0 or more (dyne / cm ² , 10 Hz, 25 ° C.). 3. A laminate of the easily cut polyamide film according to items 1 and 2.

Further, in the invention according to claim 5, the undercoat layer is represented by the general formula R'Si (OR ¹ ) (R ': substituted or unsubstituted alkyl group, vinyl group, etc., R ¹ : alkyl group). It is composed of a compound of a trifunctional organosilane or a hydrolyzate of the trifunctional organosilane, which is a compound represented, and an acrylic polyol and an isocyanate compound, wherein a reaction catalyst is added to the composite. It is a laminated body of the easily cut polyamide film according to any one of claims 2 to 4. The invention of claim 6 is
When the trifunctional organosilane of the undercoat layer is R ^′ (R ^′ : an alkyl group,
The laminated body of an easily cut polyamide film according to claim 5, wherein an epoxy group or an isocyanate group is contained in a vinyl group, a glycidoxypropyl group, or the like. Here, tin compounds such as tin chloride, tin oxychloride and tin alkoxide are used as reaction catalysts.

Further, according to the invention of claim 9, the compound represented by the general formula M (OR ² ) n (M: metal element, R ² : CH ₃ , C ₂₎
The metal alkoxide represented by an alkyl group such as H ₅ , n: oxidation number of a metal element) or a hydrolyzate of the metal alkoxide is added. A laminate of an easily cut polyamide film, wherein Si, Al, T is used as a metal in the metal alkoxide or a hydrolyzate of the metal alkoxide.
i, Zr or a mixture thereof is used.

[0013] In the eleventh aspect of the present invention, the thickness of the undercoat layer is in the range of 0.01 to 2 µm, and the easy cutting according to any one of the second to tenth aspects. It is a laminate of a conductive polyamide film.

According to a twelfth aspect of the present invention, there is provided the laminate of the easily cut polyamide film according to the second aspect, wherein the inorganic oxide is aluminum oxide, silicon oxide or a mixture thereof. .

Further, in the invention according to claim 13, the metal alkoxide contained in the gas barrier coating layer is tetraethoxysilane or triisopropoxyaluminum,
Alternatively, the laminate is an easily cut polyamide film according to claim 2, which is a mixture thereof.

According to a fourteenth aspect of the present invention, the water-soluble polymer contained in the gas barrier coating layer is polyvinyl alcohol, and the laminated body of the easy-cut polyamide film according to the second aspect. It is.

Further, the invention of claim 15 provides the invention according to claims 1 to 1
4. A package using the laminate of the easily-cut polyamide film according to any one of 4.

[0018]

According to the present invention, after providing an undercoat layer having excellent weather resistance, heat resistance, adhesion and the like on a polyamide film base material suitable for applications such as liquid soup, inorganic oxide having excellent gas barrier properties. Since the thin film layer and the coating layer are sequentially laminated, a highly practical vapor-deposited film with little delamination and gas barrier property deterioration and a packaging material using this vapor-deposited film can be obtained. By laminating a polyolefin-based resin film having a sealing property using an adhesive that can bring out the easy-cutting performance of a polyamide film, a packaging material suitable for applications such as a liquid soup can be obtained.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a laminate of the polyamide film of the present invention. FIG. 1 shows a heat-sealing polyolefin-based resin layer (3) laminated on a gas-barrier-treated polyamide film (1) by using a two-component curable urethane adhesive as an adhesive layer (2). 2 shows a basic configuration.

The substrate (1a) in FIG. 2 is a film made of a polyamide resin, on which a trifunctional organosilane or a hydrolyzate thereof, or a silane coupling agent or a hydrolyzate thereof, an acrylic polyol and an isocyanate compound are used. An undercoat layer (1b) containing a composite of (1) and an inorganic oxide thin film layer (1c) formed by vapor-depositing an inorganic oxide are laminated and further formed thereon.
The coating layer (1d) is laminated. FIG. 2 shows a structure according to claim 2 of the present invention in which a two-component curable urethane adhesive is used as the adhesive layer (2) and a polyolefin-based resin layer (3) having heat sealability is laminated.

The above-mentioned substrate (1a) is a film made of a polyamide resin which is excellent in cutability among plastic materials, and is preferably transparent if the transparency of the vapor-deposited thin film layer is utilized. For example, 6-nylon obtained by a ring opening polymerization reaction of ε-caprolactam, 6,6 obtained by a polycondensation reaction of hexamethylenediamine and adipate.
Known polyamide resins such as 6-nylon can be used, and those obtained by processing them into a film shape are used. In particular, those stretched arbitrarily in the biaxial direction are preferable because of excellent mechanical strength and dimensional stability. In addition, this base material (1
Various well-known additives and stabilizers, for example, antistatic agents, UV inhibitors, plasticizers, lubricants, etc. may be used on the surface of a). In order to improve the adhesion to the thin film, As a treatment, a corona treatment, a low-temperature plasma treatment, an ion bombardment treatment, or a chemical treatment, a solvent treatment, or the like may be performed.

Although the thickness of the substrate (1a) is not particularly limited, it is suitable as a packaging material, and an undercoat layer (1b) and an inorganic oxide vapor-deposited thin film layer (1c) for laminating other layers. Considering the processability when forming the gas barrier coating layer (1d), the thickness is generally in the range of 5 to 100 μm, and practically preferably 10 to 30 μm.

Further, in consideration of mass productivity, it is desirable to use a long film so that each layer can be formed continuously.

The undercoat layer (1b) is provided on a base material (1a) made of a polyamide resin.
The purpose is to increase the adhesion between the layer and the inorganic oxide thin film layer (1c) made of an inorganic oxide to prevent the occurrence of delamination, deterioration of gas barrier properties, and the like. As a result of intensive studies, the undercoat layer (1b) that can be used as the undercoat layer (1b) to achieve the above object is a composite of a trifunctional organosilane or a hydrolyzate of the trifunctional organosilane, an acrylic polyol and an isocyanate compound. Needs to be

The trifunctional organosilane has a general formula R ′
Si (OR ¹ ) ₃ (R ′: a substituted or unsubstituted alkyl group,
R ¹ : an alkyl group such as a vinyl group). At this time, the substituent of R ′ preferably contains an epoxy group or an isocyanate group. For example,
Ethyltrimethoxysilane, vinyltrimethoxysilane, glycidoxypropyltrimethoxysilane containing an epoxy group in R ', glycidoxytrimethoxysilane, epoxycyclohexylethyltrimethoxysilane, or R' containing an isocyanate group Is γ
-Isocyanatopropyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane and the like. These compounds may be used alone or as a mixture of two or more.

Further, the trifunctional organosilane used in the present invention may be a hydrolyzate of the above compound or the like. At this time, the substituent of R ′ preferably contains an epoxy group. As a method for obtaining a hydrolyzate, a known method such as a method in which an acid or an alkali is directly added to a trifunctional organosilane to perform hydrolysis can be used.

Acrylic polyol is a polymer compound obtained by polymerizing an acrylic acid derivative monomer, or a polymer compound obtained by copolymerizing an acrylic acid derivative monomer and another monomer, and having a hydroxyl group at a terminal. And reacts with an isocyanate group of an isocyanate compound to be added later. Among them, ethyl methacrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate,
A polymer obtained by polymerizing an acrylic acid derivative monomer such as hydroxybutyl methacrylate alone, or an acrylic polyol obtained by adding and copolymerizing another monomer such as styrene is preferably used. In consideration of the reactivity with the isocyanate compound, the hydroxyl value is 5 to 200 (KO).
Hmg / g).

Further, the isocyanate compound is added to increase the adhesion to the substrate (1a) or the inorganic oxide thin film layer (1c) by urethane bonds formed by reacting with the acrylic polyol. Acts as an agent or curing agent. In order to achieve this, as an isocyanate compound, aromatic tolylene diisocyanate (TDI) or diphenylmethane diisocyanate (MD
I), aliphatic xylene diisocyanate (XDI)
And monomers such as hexadiene isocyanate (HMDI) and isophorone diisocyanate (IPDI),
These polymers and derivatives are used, and these are used alone or as a mixture.

The mixing ratio of the acrylic polyol and the isocyanate compound used in the undercoat layer (1b) is not particularly limited. However, if the amount of the isocyanate compound is too small, poor curing may occur. It occurs and there is a problem in processing. Therefore, the mixing ratio of the acrylic polyol and the isocyanate compound is determined by the isocyanate group (N
(CO group) is preferably 50 times or less the OH group derived from the acrylic polyol, and particularly preferably the case where the NCO group and the OH group are blended in the same amount. A well-known method can be used as the mixing method, and is not particularly limited.

Further, at the time of preparing the composite, a metal alkoxide or a hydrolyzate thereof may be added to improve the liquid stability. The metal alkoxide is a general formula M (OR) n (M: metal element, n: metal) such as tetraethoxysilane [Si (OC ₂ H ₅ ) ₄ ] and tripropoxy aluminum [Al (OC ₃ H ₇ ) ₃ ]. Oxidation number) or a hydrolyzate thereof. Among them, tetraethoxysilane, tripropoxyaluminum or a mixture of both is preferable because it is relatively stable in an aqueous solvent.

Further, various additives such as a curing accelerator such as a tertiary amine, an imidazole derivative, a metal salt compound of a carboxylic acid, a quaternary ammonium salt, and a quaternary phosphonium salt, a phenol-based compound, It is also possible to add an antioxidant such as a sulfur type or a phosphite type, a leveling agent, a flow regulator, a catalyst, a crosslinking reaction accelerator, a filler, and the like.

As a method for forming the undercoat layer (1b), for example, a known printing method such as an offset printing method, a gravure printing method, or a silk screen printing method, or a known coating method such as a roll coat, a knife edge coat, or a gravure coat is used. A method can be used.

The thickness of the undercoat layer (1b) is not particularly limited as long as a uniform coating film can be formed.
Generally, it is preferable to be in the range of 0.01 to 2 μm. If the thickness is less than 0.01 μm, it is difficult to obtain a uniform coating, and the adhesion may be reduced. If the thickness exceeds 2 μm, the flexibility of the coating cannot be maintained. It is not preferable because cracks may occur. It is particularly preferred that the thickness be outside the range of 0.05 to 0.5 μm.

The thin film layer (1c) made of an inorganic oxide is made of a deposited film of an inorganic oxide such as aluminum oxide, silicon oxide, magnesium oxide or a mixture thereof, and has a transparency and a gas barrier against oxygen, water vapor and the like. What is necessary is just to have the property.

There are various methods for forming the thin film layer (1c) made of an inorganic oxide on the undercoat layer (1b), which can be formed by a normal vacuum deposition method.
Other thin film forming methods such as a sputtering method, an ion plating method, and a plasma vapor deposition method (CVD) can also be used. As a heating means of the vacuum evaporation apparatus by the vacuum evaporation method, an electron beam heating method, a resistance heating method, and an induction heating method are preferable. It is also possible to use a beam assist method. Also,
At the time of vapor deposition, reactive vapor deposition such as blowing oxygen gas may be performed in order to increase the transparency of the deposited film.

The optimum conditions for the thickness of the thin film layer (1c) vary depending on the type and constitution of the inorganic compound used, but generally the thickness is preferably in the range of 5 to 300 nm. If it is less than 5 nm, a uniform film may not be obtained, or the film thickness may not be sufficient, and may not function as a gas barrier material. On the other hand, if the thickness exceeds 300 nm, the flexibility of the thin film cannot be maintained, and the thin film may be cracked by external factors such as bending and pulling after the film is formed. There is a problem. More preferably,
It is in the range of 10 to 50 nm.

The coating layer (1d) is provided on the inorganic oxide thin film layer (1c) in order to provide a gas barrier property as high as a metal foil made of metal such as aluminum.

The coating layer (1d) is made of an aqueous solution or a water / alcohol mixed solution containing at least one of a water-soluble polymer and (a) at least one metal alkoxide and a hydrolyzate or (b) tin chloride. It consists of a coating agent used as the main agent. A solution prepared by dissolving a water-soluble polymer and tin chloride in an aqueous (water or water / alcohol mixture) solvent, or a solution prepared by mixing a solution obtained by directly or previously hydrolyzing a metal alkoxide with an inorganic oxide The thin film layer (1c) is formed by coating and heating and drying.

The water-soluble polymer used for the coating agent includes polyvinyl alcohol, polyvinylpyrrolidone, starch, methylcellulose, carboxymethylcellulose, sodium alginate and the like. In particular, when polyvinyl alcohol (hereinafter referred to as PVA) is used, the gas barrier properties are most excellent. The PVA referred to here is generally obtained by saponifying polyvinyl acetate, and includes a range from so-called partially saponified PVA in which acetic acid groups remain to several tens% to complete PVA in which only a few% of acetic acid groups remain. ,
There is no particular limitation.

As the method of applying the coating, conventionally known means such as a commonly used dipping method, roll coating method, screen printing method, spraying method and the like can be used. It is sufficient that the thickness of the coating is not less than 0.01 μm. However, if the thickness is not less than 50 μm, cracks are easily generated in the coating.

Further, another layer can be laminated on the inorganic oxide thin film layer (1c) or the coating layer (1d). For example, a printing layer. The printing layer is formed for practical use as a packaging bag or the like, and various pigments are added to conventionally used ink binder resins such as urethane, acrylic, nitrocellulose, rubber, and vinyl chloride. This is a layer composed of an ink to which additives such as an extender pigment, a plasticizer, a desiccant, a stabilizer and the like are added, and a character, a picture, and the like are formed.

As a forming method, for example, a well-known printing method such as an offset printing method, a gravure printing method, a silk screen printing method, or a well-known coating method such as a roll coat, a knife edge coat, or a gravure coat can be used. The thickness may be 0.1-2.0 μm.

For the adhesive layer (2), an adhesive obtained by mixing a polyether-based urethane adhesive as a main agent and a curing agent having an active isocyanate group as a curing agent in a ratio of NCO / OH ≧ 2 can be used. . The solids content of the adhesive is 25
Up to 35%, the smaller the coating amount, the better the cutability,
1.0-4.0 g / m < ² > is preferable.

The adhesive has a viscoelasticity of 8.0 or more (d
yne / cm ² , 10 Hz, 25 ° C.) two-component curable polyether-based urethane adhesive can be used. If the viscoelasticity is less than 8.0, the adhesive is too soft,
High cut property does not appear.

The term "viscoelasticity" refers to a property having both viscosity and elasticity, and a solid of an amorphous polymer such as natural rubber, a gel or a solution swollen with a solvent belongs to an object exhibiting viscoelasticity. Generally, these exhibit various phenomena such as creep, delayed elasticity, and stress relaxation, and are characterized by the fact that there is time in the relationship between strain and stress, and elastic hysteresis and memory phenomena also appear.

The polyolefin-based resin layer (3) is provided as a sealing layer when forming a bag-like package or the like, and a film made of a polyolefin-based resin having heat sealing properties can be used. Although not particularly limited, it is preferable to use linear low-density polyethylene. The thickness of the film is suitably from 2 to 100 μm, preferably from 3 to 60 μm. If it is 2 μm or less, sufficient heat sealing strength cannot be obtained, and if it is 100 μm or more, the heat capacity is high, and the high-speed sealing characteristics deteriorate.

[0047]

【Example】

[Example 1] The base material (1a) having a thickness of 15
On one surface of a biaxially stretched polyamide film having a thickness of 0.1 μm, a composite solution A was formed as an undercoat layer (1b) to a thickness of 0.1 μm by a gravure coating method. The composite solution A described here is a mixed solution obtained by adding TDI as an acrylic polyol and an isocyanate compound in a diluting solvent (ethyl acetate) so that NCO groups are equivalent to OH groups of the acrylic polyol. It was diluted to a concentration. Next, metal aluminum is evaporated on the undercoat layer (1b) by a vacuum evaporation apparatus using an electron beam heating method, oxygen gas is introduced therein, and aluminum oxide having a thickness of 15 nm is evaporated to form an inorganic oxide thin film layer (1c). Was formed. Further thereon, a coating layer 4 having a thickness of 0.5 μm was formed by a gravure coating method using a coating agent having the following composition to obtain a laminate a.

[Composition of coating agent] A mixture of the liquid and the liquid in a weight ratio of 60/40. Liquid: 89.6 g of 0.1N hydrochloric acid was added to 10.4 g of tetraethoxysilane, and the mixture was stirred for 30 minutes and hydrolyzed to obtain a hydrolyzed solution having a solid content of 3% by weight (in terms of SiO ₂ ). Liquid: water / isopropyl alcohol solution (water : Isopropyl alcohol = 90: 10, weight ratio)

As the polyolefin resin layer (3), a linear low-density polyethylene film used for a die roll having no cutability requirement and this laminate a are used as the two-component curing type ether-based resin for the adhesive layer (2). Adhesive (viscoelasticity = 8.
Dry lamination was performed using 1) to obtain a laminated product A.

Example 2 A laminated product B was prepared in the same manner as in Example 1 except that a linear low-density polyethylene film having retort resistance and requiring no cut property was used for the polyolefin resin layer (2). Obtained.

Comparative Example 1 A laminate C was prepared in the same manner as in Example 1 except that a two-part curable ester urethane adhesive (viscoelasticity = 7.6) was used for the adhesive layer (2). Obtained.

Comparative Example 2 In Example 1, a two-component curable ester urethane-based adhesive (viscoelasticity = 7.6) was used for the adhesive layer (2), and the polyolefin-based resin layer (3) had retort resistance. A laminated product D was obtained in the same manner as above except that a linear low-density polyethylene film having no cutability requirement was used.

[Comparative Example 3] Instead of the laminate a obtained in Example 1, a biaxially stretched polyamide film coated with polyvinyl dichloride (PVDC) was used, and a two-component curable ester urethane-based adhesive layer (2) was used for the adhesive layer (2). Using an adhesive (viscoelasticity = 7.6), a linear low-density polyethylene film used as a polyolefin-based resin layer (3) for a die roll that does not require cutability was laminated to obtain a laminated product E. .

For the dry laminates A to E of the examples and comparative examples, oxygen permeability (ml / m ² / day),
Water vapor transmission rate (g / m ² / day), lamination strength (g / 15 mm), viscoelasticity of adhesive (dyne / cm,
(10 Hz, 25 ° C.), tear strength (g), cutability, and the presence or absence of chlorine by a combustion test were evaluated. Table 1 shows the results.

For the viscoelasticity, an alternating force is applied to the adhesive by a general viscoelasticity meter, and the phase difference from the drive vibration, the amplitude ratio with the drive vibration, the resonance frequency, the resonance curve, the viscoelasticity hysteresis curve, and the like are observed. Then, the dynamic elastic modulus and dynamic viscosity were determined, and the dynamic viscoelasticity was measured.

The tear strength was based on the method A (trouser tearing method) defined in JIS-K-7128.

For evaluation of cutability, about 15 g of tap water was packed in pouches (external dimensions: 100 mm × 50 mm) of each composition, stored at room temperature for one day, and cut into 1-2 mm in the pouches.
Sensory evaluation was performed. N = 3, 5 monitors.

[0059]

[Table 1]

The measurement conditions were as follows: oxygen permeability and water vapor permeability were 30 ° C.-70% RH, 40 ° C.-90% RH,
Laminate strength is T-type peeling, peeling speed 30 at 15mm width
0 mm / min.

The characters for evaluation of the cut properties were as follows: ○: no resistance, the cut was opened almost cleanly, Δ: resistance at the beginning of cutting,
After that, the cut edge can be cut cleanly and easily. ×: Polyethylene stretch can be seen in the entire cut part, but it can be opened to the end,
XX: The polyethylene stretched at the cut end was large and could be opened only halfway.

In Examples 1 and 2, overall physical properties were well-balanced, and physical properties enough to satisfy the required quality when storing the liquid soup as contents appeared. did not become.

[0063]

As described above, according to the present invention,
Using a laminated film in which an undercoat layer with excellent adhesion is provided on a polyamide film substrate and an inorganic oxide thin film layer and a coating layer with excellent gas barrier properties are sequentially laminated, a polyolefin-based resin with a polyether-based urethane adhesive Lamination with a film makes it possible to provide a packaging material suitable as a packaging material for contents such as a liquid soup that requires gas barrier properties and easy cutting properties.

[Brief description of the drawings]

FIG. 1 is a sectional view of a basic structure showing a laminate of an easily cut polyamide film of the present invention.

FIG. 2 is a cross-sectional view showing a laminate of an easily cut polyamide film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Gas barrier treated polyamide film 1a ... Substrate 1b ... Undercoat layer 1c ... Thin film layer 1d ... Coating layer 2 ... Undercoat layer 3 ... Polyolefin resin layer

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Ken Takahara 1-5-1, Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd. F-term (reference) 3E086 AD01 BA04 BA15 BA24 BB01 BB51 BB90 CA01 4F100 AA05A AA05E AA17A AA17D AA28A AH06A AK01E AK03C AK46A AK51A AK51B BA03 BA05 BA06 BA07 BA10A BA10C BA25D CB02B CC00A EH46E EJ65A GB15 JB09E JD02A JD02D JD02E JK06 JK07B JL08A JL11 JL11D

Claims (15)

[Claims] An easy-cut polyamide film characterized in that a heat-sealing polyolefin resin layer is laminated on at least one surface of a gas-barrier-treated polyamide film via a two-component curable urethane adhesive. Laminate. 2. At least one surface of a polyamide film,
An undercoat layer, an inorganic oxide thin film layer of inorganic oxide having a thickness of 5 to 300 nm which imparts gas barrier properties, a water-soluble polymer and (a) one or more metal alkoxides and a hydrolyzate thereof or (b) chloride A gas barrier-treated polyamide film obtained by sequentially laminating a gas barrier coating layer coated with a coating agent mainly containing an aqueous solution containing at least one of tin or a water / alcohol mixed solution,
A laminated body of an easy-cut polyamide film, wherein a polyolefin-based resin layer having heat sealing properties is laminated via a two-component curable urethane adhesive. 3. The easy-cutting property according to claim 1, wherein the adhesive is a two-part curable polyether-based urethane adhesive, and the ratio of NCO groups / OH groups is 2 or more. A laminate of a polyamide film. 4. The viscoelasticity of the two-component curable polyether-based urethane adhesive is 8.0 or more (dyne / cm ² , 10H).
z, 25 ° C.), wherein the laminated body of the easily cut polyamide film according to claim 1 or 2, wherein 5. The method according to claim 1, wherein the undercoat layer has a general formula of R′Si.
(OR ¹ ) (R ′: substituted or unsubstituted alkyl group, vinyl group, etc., R ¹ : alkyl group) represented by trifunctional organosilane or a hydrolyzate of the trifunctional organosilane; The laminate of an easily cut polyamide film according to any one of claims 2 to 4, comprising a composite with a polyol and an isocyanate compound, wherein a reaction catalyst is added to the composite. 6. The method according to claim 1, wherein the trifunctional organosilane of the undercoat layer comprises R ^′ (R ^′ :
6. The laminate of claim 5, wherein the epoxy group or the isocyanate group is contained in an alkyl group, a vinyl group, a glycidoxypropyl group, or the like. 7. The laminate of claim 5, wherein the reaction catalyst of the undercoat layer is a tin compound. 8. The laminate of claim 7, wherein the tin compound is tin chloride, tin oxychloride and tin alkoxide. 9. The compound of the undercoat layer, wherein the compound represented by the general formula M (OR ² ) n (M: metal element, R ² : alkyl group such as CH ₃ , C ₂ H ₅ , n: oxidation number of metal element 9. The laminate of an easily cut polyamide film according to claim 2, wherein a metal alkoxide represented by the formula (1) or a hydrolyzate of the metal alkoxide is added. 10. The method according to claim 9, wherein the metal in the metal alkoxide of the undercoat layer or the hydrolyzate of the metal alkoxide is Si, Al, Ti, Zr or a mixture thereof. A laminate of a cuttable polyamide film. 11. The undercoat layer having a thickness of 0.0
2. The method according to claim 1, wherein the distance is in the range of 1 to 2 [mu] m.
0. A laminate of the easily-cut polyamide film according to any one of 0. 12. The method according to claim 12, wherein the inorganic oxide is aluminum oxide,
The laminate of an easily-cut polyamide film according to claim 2, wherein the laminate is silicon oxide or a mixture thereof. 13. The easily cut polyamide film according to claim 2, wherein the metal alkoxide contained in the gas barrier coating layer is tetraethoxysilane, triisopropoxyaluminum, or a mixture thereof. Laminate. 14. The laminate of claim 2, wherein the water-soluble polymer contained in the gas barrier coating layer is polyvinyl alcohol. 15. A package using the laminate of the easily cut polyamide film according to any one of claims 1 to 14.