JP2018171796A - Easily openable gas barrier laminate, and easily openable gas barrier packaging material and pillow packaging bag comprising the laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate excellent in workability during production and excellent in easy openability, gas barrier properties and bending resistance, and to provide a packaging material and a pillow package comprising the laminate.MEANS FOR SOLVING THE PROBLEM: The easily openable gas barrier laminate includes at least a substrate layer (A), a gas barrier adhesive layer (B), a gas barrier inorganic vapor deposition layer (C), and an easily openable sealant layer (D). The easily openable gas barrier laminate has a configuration in which the gas barrier inorganic vapor deposition layer (C) and the adhesive layer (B) are in contact with each other. The adhesive layer (B) has a thickness of 0.5-6.0 μm.SELECTED DRAWING: Figure 1

Description

  The present invention provides an easily openable gas barrier having at least a base material layer (A), a gas barrier adhesive layer (B), a gas barrier inorganic vapor deposition layer (C), and an easily openable sealant layer (D). It is a laminate.

The easy-open gas barrier laminate has a configuration in which the gas barrier inorganic vapor deposition layer (C) and the adhesive layer (B) are laminated adjacent to each other, and the thickness of the adhesive layer (B) is 0.5 to 6. An easily-openable gas barrier laminate having a gas barrier coating film layer (E) and / or a printing layer (F), and the easily-openable gas barrier laminate having a thickness of 0.0 μm. , Easy-opening gas barrier packaging materials and pillow packaging bags, and in particular, laminates with excellent bending resistance, easy-opening properties, oxygen barrier properties, and water vapor barrier properties (reduced oxygen and water vapor permeability) And a packaging material comprising the laminate and a pillow packaging bag.
The packaging material of the present invention is most suitable for various packaging bags and retort bags.

In general, a packaging material having gas barrier properties includes a laminate having at least a base material layer, a gas barrier layer, an adhesive layer, and a sealant layer, and in particular, as a gas barrier layer for improving oxygen barrier properties, a metal foil, Metal or metal oxide vapor deposition films are used.
However, the metal foil as the gas barrier layer can achieve a high oxygen barrier property, but is thicker than the deposited film, etc., and as a result, the packaging material using the metal foil is also thicker and the bending resistance is inferior. It has been known.
On the other hand, if a metal or metal oxide vapor deposition film is used, the film thickness can be reduced and the bendability is excellent. However, the surface of the vapor deposition film has irregularities. It was difficult to achieve the problem.

Further, Patent Document 1 discloses a thermosetting gas (oxygen) barrier polyurethane resin containing a cured resin obtained by reacting an active hydrogen-containing compound (A) and an organic polyisocyanate compound (B) as an oxygen barrier material. Have been described.
In the cured resin, a skeleton structure derived from meta-xylene diisocyanate is contained in an amount of 20% or more, and among the (A) and (B), the proportion of trifunctional or higher functional compounds is (A) and ( Gas (oxygen) barrier composite film (base film layer and thermosetting gas barrier polyurethane resin) using a thermosetting oxygen barrier polyurethane resin, characterized in that it is 7% by mass or more based on the total amount of B) And a layer containing.

  Furthermore, in Patent Document 2, the thin film layer surface of a transparent coating film in which a thin film layer of silicon oxide or aluminum oxide is formed on at least one surface of a polymer film substrate, and a heat-sealable resin film, One or more particles selected from inorganic silicon oxide and aluminum oxide materials and a barrier laminate comprising a polyester polyol and an isocyanate compound, and a barrier laminate that is adhered by a dry laminate method; and A packaging material using this is described.

  However, in Patent Document 1, the composition has poor workability because a highly polar solvent must be used. For example, when a highly soluble solvent such as acetone is used, there is a problem that the adjusted viscosity is likely to increase due to the reaction between water and isocyanate because the boiling point is low and the water in the outside air is easily taken in.

  Further, in Patent Document 2, since the inorganic compound contained in the adhesive is a nano-order spherical or amorphous inorganic compound, the oxygen barrier property of the adhesive itself, particularly bending load was given. There is a problem that the oxygen barrier property is not high.

Japanese Patent No. 4054972 Japanese Patent No. 3829526

  The present invention solves the above-mentioned problems, has a total number of layers, is excellent in workability at the time of producing a laminate, and has an easy-opening property, gas barrier property and bending resistance, and the laminate. An object of the present invention is to provide a packaging material and a pillow packaging bag.

  As a result of various studies, the inventor has at least a base material layer (A), a gas barrier adhesive layer (B), a gas barrier inorganic vapor deposition layer (C), and an easily openable sealant layer (D). The gas barrier inorganic vapor deposition layer (C) and the adhesive layer (B) are adjacent to each other, and the thickness of the adhesive layer (B) is 0.5-6. An easy-opening gas barrier laminate having 0 μm, an easy-opening gas barrier laminate having a gas barrier coating film layer (E) and a printing layer (F), and an easy-opening property comprising the easy-opening gas barrier laminate It has been found that a gas barrier packaging material achieves the above objective.

The present invention is characterized by the following points.
1. An easily openable gas barrier laminate having at least a base material layer (A), a gas barrier adhesive layer (B), a gas barrier inorganic vapor deposition layer (C), and an easily openable sealant layer (D). The gas barrier inorganic vapor deposition layer (C) and the adhesive layer (B) are laminated adjacent to each other, and the thickness of the adhesive layer (B) is 0.5 to 6.0 μm. Laminated body.
2. Furthermore, it is a gas barrier laminate having a gas barrier coating film layer (E) between the base material layer (A) and the adhesive layer (B), and the gas barrier coating film layer (E) is composed of a metal alkoxide and a water-soluble layer. The easy-open gas barrier laminate according to the above 1, which contains a sol-gel hydrolysis polycondensate of a mixture with a polymer.
3. Furthermore, the easily openable gas barrier laminated body of said 1 or 2 which has a printing layer (F) between a base material layer (A) and an adhesive bond layer (B).
4). Gas barrier inorganic vapor deposition layer (C) is a layer which has a 1 type, or 2 or more types chosen from the group which consists of an aluminum vapor deposition layer, an alumina vapor deposition layer, and a silica vapor deposition layer, In any one of said 1-3. Easy-open gas barrier laminate.
5. The easily openable gas barrier laminate according to any one of 1 to 3, wherein the gas barrier inorganic vapor deposition layer (C) is a layer having an aluminum vapor deposition layer.
6). The easily openable gas barrier laminate according to any one of 1 to 5, wherein the gas barrier inorganic vapor-deposited layer (C) has a thickness of 1 to 100 nm.

Oxygen permeability under 7.23 ° C. 90% RH environment is a ^{0.05~2.0cc / m 2 / day / atm} , the water vapor permeability under 40 ° C. 90% RH environment, 0.01-2 The easily-openable gas barrier laminate according to any one of the above 1 to 6, which is 0.0 g / m ² / day / atm, for an oxygen barrier and a water vapor barrier.
8). The increase value of oxygen permeability in the environment of 23 ° C. and 90% RH after giving a filling load once with a vertical pillow filling machine is zero or 10.0 cc / m ² / day / atm or less,
8. The increase in water vapor permeability under a 40 ° C. and 90% RH environment from before the bending load is applied is zero or 5.0 g / m ² / day / atm or less, according to any one of 1 to 7 above. Easy-openable gas barrier laminate.
9. The easily openable gas barrier laminate according to any one of 1 to 7, wherein the total number of constituent layers is 6 or less.
10. An easily openable gas barrier packaging material using the easily openable gas barrier laminate according to any one of 1 to 9 above.
11. The pillow packaging bag using the easily openable gas barrier laminated body in any one of said 1-9.

  The easy-opening gas barrier laminate of the present invention and the easy-opening gas barrier packaging material comprising the easy-opening gas barrier laminate include at least a base layer (A), a gas barrier adhesive layer (B), and a gas barrier inorganic material. It has a vapor-deposited layer (C) and an easily-openable sealant layer (D). The gas barrier inorganic vapor-deposited layer (C) and the adhesive layer (B) are adjacent to each other. B) has a thickness of 0.5 to 6.0 μm, or further has a gas barrier coating film layer (E) and a printing layer (F), and has a gas barrier inorganic vapor deposition layer (C) and a gas barrier property. By combining the adhesive layer (B) adjacent to each other, the concave and convex concave portions generated on the surface of the gas barrier inorganic vapor-deposited layer (C) are filled with the adhesive layer (B) having gas barrier properties and flattened. Uniform gas barrier in the surface direction While retaining flexibility by reducing the thickness of the gas barrier inorganic vapor-deposited layer (C), with a small total structure layer number, it is possible to exert a conventional equal or gas barrier properties. Moreover, since it has an easily openable sealant layer (D), it can express easily openable.

It is a schematic sectional drawing which shows the example about the layer structure of the easily openable gas barrier laminated body of this invention. It is a schematic sectional drawing which shows another example about the layer structure of the easily openable gas barrier laminated body of this invention. It is a schematic sectional drawing which shows another example about the layer structure of the easily openable gas barrier laminated body of this invention.

The easy-open gas barrier laminate of the present invention, the easy-open gas barrier packaging material comprising the easy-open gas barrier laminate, and the pillow packaging bag will be described in detail below with reference to the drawings.
In the present invention, the total number of constituent layers is the detailed number of layers, such as a base material layer, a gas barrier layer, an adhesive layer, and a sealant layer, that constitute the laminate, such as a vapor deposition layer and an AC coat in each layer. It is the number of layers including the special treatment coat layer. For example, a PET film layer with an aluminum vapor deposition layer is counted as two layers.
1 to 3 are schematic cross-sectional views showing an example of the layer structure of the easy-open gas barrier laminate of the present invention.

As shown in FIG. 1, the easily openable gas barrier laminate of the present invention comprises a base material layer (A), a gas barrier adhesive layer (B), a gas barrier inorganic vapor deposition layer (C), and an easily openable gas barrier laminate. The structure formed by laminating the sealant layer (D) is a basic structure.
As another aspect of the easily openable gas barrier laminate of the present invention, as shown in FIG. 2, a gas barrier inorganic vapor deposition layer (C) is further provided between the base material layer (A) and the adhesive layer (B). The gas barrier inorganic vapor deposition layer and the gas barrier coating film layer (E) may be laminated separately.
As another aspect of the laminate of the present invention, as shown in FIG. 3, the printed layer (F) is laminated between the base material layer (A) and the gas barrier adhesive layer (B). May be.
Said example is an example of the easily openable gas barrier laminated body of this invention, and this invention is not limited to this.

Next, the material of the easily openable gas barrier laminate according to the present invention, the production method thereof, and the like will be described.
The resin names used in the present invention are those commonly used in the industry. Further, the present invention is not limited to the specific examples listed below.

[Base material layer (A)]
As the base material layer (A), a metal that has excellent chemical or physical strength, can withstand the conditions for forming an inorganic vapor-deposited film, and can be favorably retained without impairing the properties of the inorganic vapor-deposited film, An inorganic material such as a metal oxide or an organic material such as a resin can be used as a film or a sheet, for example.
As a base material layer (A), although a single layer film or a multilayer laminated film is used, it is not specifically limited, Arbitrary films used for various packaging materials can be used. Among these, a suitable one is freely selected and used according to the use conditions such as the type of contents to be packaged and the presence or absence of heat treatment after filling.

  Specific examples of the film preferably used as the base material layer (A) include paper, aluminum foil, cellophane, polyamide resin film, polyester resin film, olefin resin film, acid-modified polyolefin resin film, and polystyrene resin. Film, polyurethane-based resin film, acetal-based resin film, uniaxially or biaxially stretched film thereof, K coat film, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, polybutene, Polyvinyl alcohol, ethylene-vinyl acetate copolymer, ionomer, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester copolymer, ethylene-propylene copolymer, methylpentene, Liacrylonitrile, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyvinylidene fluoride (PVDF), ethylene-tetrafluoroethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate resin film, K-coated stretched polypropylene film, K-coated stretched nylon film, and two or more of these films Examples include laminated composite films.

  Among them, uniaxial or biaxially stretched polyester films such as polyethylene terephthalate and polyethylene naphthalate, uniaxial or biaxially stretched polyamide films of polyamide such as nylon 6, nylon 66, MXD6 (polymetaxylylene adipamide), and biaxial An oriented polypropylene film (OPP) etc. can be used conveniently. Moreover, transparent vapor deposition PET, such as silica vapor deposition PET and alumina vapor deposition PET, aluminum vapor deposition biaxially stretched polypropylene film (OPP), etc. are also suitable.

(thickness)
The thickness of the base material layer (A) can be arbitrarily selected, but from the viewpoint of moldability and transparency, it can be selected from the range of about 1 μm to 300 μm, preferably in the range of 1 to 100 μm. It is. If it is thinner than this, the strength is insufficient, and if it is thicker than this, the rigidity becomes too high, and the processing may be difficult.

(surface treatment)
Moreover, the film or sheet which comprises a base material layer (A) and a base material layer (A) is an adhesive layer (B
In order to improve the adhesion with each adhesive layer such as) or each inorganic vapor deposition layer such as gas barrier inorganic vapor deposition layer (C), the base layer (A) and the base layer (A) are laminated before lamination or vapor deposition. If necessary, physical treatment such as corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, chemical treatment, etc. Chemical treatment such as oxidation treatment using chemicals, treatment for forming an adhesive layer, primer coating agent layer, undercoat layer, vapor deposition anchor coating agent layer, etc., and other treatments may be performed. An inorganic vapor deposition layer may be provided after the surface treatment, and a barrier coat layer such as a gas barrier coating film layer (E) described later may be further provided on the inorganic vapor deposition layer.

(Film forming method)
As the resin film or sheet used for the base material layer (A), for example, one or more resins selected from the group of the above resins are used, and an extrusion method, a cast molding method, a T-die method, a cutting method are used. It can be produced by a conventional film-forming method such as a method or an inflation method, or by a multilayer co-extrusion film-forming method using two or more resins. Furthermore, from the viewpoint of the strength, dimensional stability, and heat resistance of the film, the film can be stretched uniaxially or biaxially using, for example, a tenter method or a tubular method.

(Additive)
The resin film or sheet used for the base material layer (A) can be processed, heat-resistant, weather-resistant, mechanical properties, dimensional stability, anti-oxidation, slipperiness, releasability, and flame retardancy as necessary. Lubricants, crosslinking agents, antioxidants, UV absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, etc., for the purpose of improving and modifying properties, antifungal properties, electrical properties, strength, etc. The plastic compounding agent, additive, and the like can be added, and the amount thereof can be arbitrarily added according to the purpose within a range that does not adversely affect other performances.

[Gas barrier adhesive layer (B)]
The adhesive layer (B) in the easy-open gas barrier laminate of the present invention has gas barrier properties, particularly oxygen and water vapor barrier properties.
The thickness of the adhesive layer (B) is 0.5 to 6.0 μm, preferably 0.8 to 5.0 μm, and more preferably 1.0 to 4.5 μm. If it is thinner than the above range, the gas barrier property tends to be insufficient, and if it is thicker than the above range, the bending resistance tends to be inferior, and the gas barrier property after bending tends to be lowered.
The adhesive resin composition for forming the adhesive layer (B) includes, for example, a polyol (J) having two or more hydroxyl groups in one molecule and an isocyanate compound (K) having two or more isocyanate groups in one molecule. ) And a phosphoric acid-modified compound (L), and the polyol (J) is one or two selected from the group consisting of a polyester structure, a polyester polyurethane structure, a polyether structure, and a polyether polyurethane structure as the main skeleton. The resin composition for adhesives which has the above is mentioned. The resin composition for adhesives may further contain a plate-like inorganic compound (M).

  The glass transition temperature of the cured coating film of the adhesive resin composition is preferably in the range of -30 ° C to 80 ° C. More preferably, it is 0 degreeC-70 degreeC. More preferably, it is 25 degreeC-70 degreeC. When the glass transition temperature is higher than 80 ° C., the flexibility of the cured coating film near room temperature becomes low, and thus the adhesiveness to the substrate may be deteriorated due to poor adhesion to the substrate. On the other hand, when the temperature is lower than −30 ° C., there is a fear that sufficient oxygen barrier properties may not be obtained due to intense molecular motion of the cured coating film at around room temperature, and there is a possibility that adhesive strength may be reduced due to insufficient cohesive force.

Specific examples of such a resin composition for an adhesive containing a polyol (J), an isocyanate compound (K), and a phosphoric acid-modified compound (L) are oxygen barrier properties sold by DIC Corporation. A series of adhesive path rims (PASLIM) can be used, and in particular, PASLIM VM001 / VM102CP, which is a compound in which the main skeleton is polyester-based and the curing agent has two or more isocyanate groups, is preferably used.

(Polyol (J))
The polyester structure in the polyol (J) is obtained by polycondensation reaction of a polyvalent carboxylic acid and a polyhydric alcohol by a known and usual method.
Examples of the polyvalent carboxylic acids include aliphatic polyvalent carboxylic acids and aromatic polyvalent carboxylic acids.
Specific aliphatic polyvalent carboxylic acids include succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and the like.

  Specific aromatic polycarboxylic acids include orthophthalic acid, terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1,2-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, and 2,3-naphthalene. Dicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, naphthalic acid, biphenyldicarboxylic acid, 1,2-bis (phenoxy) ethane-p, p'-dicarboxylic acid Acids and anhydrides or ester-forming derivatives of these dicarboxylic acids; polybasic acids such as p-hydroxybenzoic acid, p- (2-hydroxyethoxy) benzoic acid and ester-forming derivatives of these dihydroxycarboxylic acids, etc. .

Specific ortho-oriented aromatic dicarboxylic acids include orthophthalic acid, 1,2-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, and anhydrides or ester forming properties of these dicarboxylic acids. Derivatives and the like.
These polyvalent carboxylic acids can be used alone or in combination of two or more.
Examples of the polyhydric alcohol include aliphatic polyhydric alcohols and aromatic polyhydric phenols.

  Specific examples of the aliphatic polyhydric alcohol include ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, cyclohexanedimethanol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1, Examples include 6-hexanediol, methylpentanediol, dimethylbutanediol, butylethylpropanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, and tripropylene glycol.

  Specific examples of the aromatic polyphenol include hydroquinone, resorcinol, catechol, naphthalene diol, biphenol, bisphenol A, hisphenol F, tetramethylbiphenol, ethylene oxide extension products, and hydrogenated alicyclics. Etc. can be illustrated.

(Isocyanate compound (K))
The isocyanate compound (K) has two or more isocyanate groups in the molecule, may be aromatic or aliphatic, may be either a low molecular compound or a high molecular compound, a diisocyanate compound having two isocyanate groups, Known compounds such as three or more polyisocyanate compounds can be used. The isocyanate compound (K) may be a blocked isocyanate compound obtained by addition reaction using a known isocyanate blocking agent using a known and appropriate method.

Among these, from the viewpoint of adhesiveness and retort resistance, polyisocyanate compounds are preferred, and in terms of imparting oxygen barrier properties, those having an aromatic ring are preferred, and in particular, isocyanate compounds containing a metaxylene skeleton are urethane groups. This is preferable because the oxygen barrier property can be improved not only by hydrogen bonding but also by π-π stacking between aromatic rings.

  Specific examples of the isocyanate compound (K) include tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, metaxylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, and these. Trimers of isocyanate compounds, and excess amounts of these isocyanate compounds, such as ethylene glycol, propylene glycol, metaxylylene alcohol, 1,3-bishydroxyethylbenzene, 1,4-bishydroxyethylbenzene, trimethylolpropane, glycerol , Pentaerythritol, erythritol, sorbitol, ethylenediamine Reaction with low molecular active hydrogen compounds such as monoethanolamine, diethanolamine, triethanolamine, metaxylylenediamine and their alkylene oxide adducts, various polyester resins, polyether polyols, and high molecular active hydrogen compounds of polyamides. Adduct bodies, burette bodies, allophanate bodies, and the like obtained by

(Phosphate-modified compound (L))
The phosphoric acid-modified compound (L) has an effect of improving the adhesive strength to an inorganic member, and a known and commonly used compound can be used.
Specifically, phosphoric acid, pyrophosphoric acid, triphosphoric acid, methyl acid phosphate, ethyl acid phosphate, butyl acid phosphate, dibutyl phosphate, 2-ethylhexyl acid phosphate, bis (2-ethylhexyl) phosphate, isododecyl acid phosphate, butoxyethyl Acid phosphate, oleyl acid phosphate, tetracosyl acid phosphate, 2-hydroxyethyl methacrylate acid phosphate, polyoxyethylene alkyl ether phosphate, and the like can be used, and one or more of these can be used.

(solvent)
In the production process of the easily openable gas barrier laminate of the present invention, the polyol (J) and the isocyanate compound (K) are dissolved, and the phosphoric acid-modified compound (L) and the plate-like inorganic compound (M) can be uniformly dispersed. There is no particular limitation as long as it has an appropriate boiling point and volatility.

(Plate-like inorganic compound (M))
The plate-like inorganic compound (M) has an effect of improving the laminate strength and gas barrier property of the gas barrier adhesive layer (B) obtained by curing the resin composition for adhesive.
Specific examples of the plate-like inorganic compound (M) include kaolinite-serpentine clay minerals (haloloy, kaolinite, enderite, dickite, nacrite, antigolite, chrysotile, etc.), pyrophyllite-talc group (Pyrophyllite, talc, kerolai, etc.) can be used, and one or more of these can be used.

[Gas barrier inorganic vapor deposition layer (C)]
The gas barrier inorganic vapor deposition layer (C) is a barrier film having gas barrier properties that prevents permeation of oxygen gas, water vapor, and the like, and examples thereof include vapor deposition films made of inorganic substances or inorganic oxides.
In general, the surface of the inorganic vapor-deposited layer has ultra-fine irregularities. At the ultra-fine level, the thickness of the inorganic vapor-deposited layer is not uniform, and the thin portion has a weak gas barrier property in the surface direction.

However, the laminate of the present invention has a configuration in which the gas barrier inorganic vapor-deposited layer (C) and the adhesive layer (B) are in contact with each other, so that the super fine unevenness generated on the surface of the gas barrier inorganic vapor-deposited layer (C) is obtained. By having a structure in which the concave portion is filled and planarized by the adhesive layer (B) having gas barrier properties, the gas barrier properties in the plane direction are made uniform, and the layer thickness of the gas barrier inorganic vapor deposition layer (C) is reduced. While maintaining the bending resistance, it is possible to exhibit a gas barrier property that is equal to or higher than the conventional one.

The gas barrier inorganic vapor deposition layer (C) is preferably a layer having one or more selected from the group consisting of an aluminum vapor deposition layer, an alumina vapor deposition layer, and a silica vapor deposition layer, and particularly has an aluminum vapor deposition layer. It is preferable.
The gas barrier inorganic vapor deposition layer (C) can be provided directly on the sealant layer (D) without an adhesive layer such as an adhesive layer (B).

  Furthermore, if necessary, it is possible to impart a light blocking property that prevents transmission of visible light, ultraviolet light, and the like. Moreover, the gas barrier inorganic vapor deposition layer (C) may be composed of one layer or two or more layers. When composed of two or more layers, each may have the same composition or a different composition.

The thickness of the gas barrier inorganic vapor deposition layer (C) is preferably 1 to 200 nm, and the more preferred thickness varies depending on the vapor deposition species, but in the case of an aluminum vapor deposition film, it is more preferably 1 to 100 nm, and still more preferably. Is 15 to 60 nm, particularly preferably 10 to 40 nm.
In the case of a silicon oxide or alumina deposited film, the thickness is more preferably 1 to 100 nm, still more preferably 10 to 50 nm, and particularly preferably 20 to 30 nm.

A gas barrier inorganic vapor deposition layer (C) can be formed by a conventionally well-known method using a conventionally well-known inorganic substance or inorganic oxide, The composition and formation method are not specifically limited.
Examples of the forming method include physical vapor deposition methods (Physical Vapor Deposition method, PVD method) such as vacuum deposition method, sputtering method, and ion plating method, plasma chemical vapor deposition method, thermal chemical vapor deposition method, And chemical vapor deposition (chemical vapor deposition, CVD) such as photochemical vapor deposition.

In the present invention, the gas barrier inorganic vapor deposition layer (C) can be provided on the surface of the sealant layer (D) on the adhesive layer (B) side.
At that time, the surface of the sealant layer (D) can be pretreated as necessary. Specifically, corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow treatment, etc. A physical treatment such as a discharge treatment or a chemical treatment such as an oxidation treatment using a chemical may be performed.

  In the easy-opening gas barrier laminate of the present invention, in order to further enhance the gas barrier property against oxygen gas, water vapor and the like, a gas barrier inorganic vapor deposition layer similar to the gas barrier inorganic vapor deposition layer (C) is bonded to the base material layer (A). It can also be provided on the side in contact with the agent layer (B). The pretreatment, vapor deposition type, vapor deposition film forming method and the like are the same as those of the gas barrier inorganic vapor deposition layer (C).

[Sealant layer (D) (heat seal layer)]
The sealant layer (D) has an easy-open gas barrier laminate of the present invention and an easy-open gas barrier packaging material comprising the easy-open gas barrier laminate. A function such as impact property is imparted, and an easy peel film is used. In particular, a material that can suppress a decrease in gas barrier properties after bending by imparting bending resistance is desirable.
As the easy peel film, any of an interfacial peeling type, a cohesive peeling type, and an interlayer peeling type can be applied, and can be appropriately selected and used depending on the type of packaging and required characteristics.
As an easy-opening index, the seal strength of the package is preferably in the range of 2 to 20 N / 15 mm, and an easy peel film capable of giving the seal strength in the range is used.
In the present invention, a material that satisfies the various conditions as described above can be arbitrarily used.

In the present invention, the sealant layer (D) desirably has a heat-sealable resin layer. The heat-sealable resin layer may be any material that can be melted by heat and fused to each other.
Examples of the resin suitable for the sealant layer (D) include polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene polyethylene, unstretched polypropylene, and the like, and a resin film composed of one or more of these resins. Or a sheet | seat or another coating film etc. can be used.
As a layer structure of the sealant layer (D), a multilayer film of polyethylene / polypropylene + polyethylene / polypropylene is suitable. Moreover, the film which vapor-deposited on the unstretched polypropylene (CPP) which can heat seal an aluminum film, a low density polyethylene, and a linear low density polyethylene can also be used.
A known flex resistance improver, an inorganic or organic additive, or the like can be blended with the above resin as necessary.

(Film thickness of sealant layer (D))
The thickness of the sealant layer (D) can be arbitrarily selected, but from the viewpoint of strength as a packaging material, it can be selected from a range of about 5 to 500 μm, preferably 10 to 250 μm. Preferably it is the range of 15-100 micrometers. If it is thinner than this, sufficient laminate strength cannot be obtained even if it is heat-sealed, it does not function as a packaging material, and puncture resistance and the like deteriorate. On the other hand, if it is thicker than this, the cost rises and the film becomes hard and workability deteriorates.

[Gas barrier coating film layer (E)]
In the present invention, a gas barrier coating film layer (E) is further provided between the base material layer (A) and the adhesive layer (B) in order to improve the barrier property against gases such as oxygen gas and water vapor. be able to. A gas barrier coating film layer (E) may be provided on the gas barrier inorganic vapor deposition layer laminated | stacked on the base material layer (A).
The gas barrier coating film layer (E) is a hydrolyzate of a metal alkoxide obtained by polycondensation of a mixture of a metal alkoxide and a water-soluble polymer by the sol-gel method in the presence of a sol-gel method catalyst, water, an organic solvent, or the like. Or it is preferable that it is a layer formed from resin compositions, such as a hydrolysis condensate of a metal alkoxide.

As a metal alkoxide, 1 type (s) or 2 or more types represented by the following general formula can be used preferably.
R ¹ _n M (OR ² ) _m
(In the formula, R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m) Represents the valence of M.)
Here, as the metal atom M, silicon, zirconium, titanium, aluminum or the like can be used. Specific examples of the organic group represented by R ¹ and R ² include alkyl groups such as a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, and an i-butyl group. Can be mentioned. In the same molecule, these alkyl groups may be the same or different.

Examples of such metal alkoxides include tetramethoxysilane Si (OCH ₃ ) ₄ , tetraethoxysilane Si (OC ₂ H ₅ ) ₄ , tetrapropoxysilane Si (OC ₃ H ₇ ) ₄ , tetrabutoxysilane Si (OC ₄ H ₉ ) _{4 and the} like, and silane coupling agents having a functional group that binds to organic substances.
Metal alkoxides may be used alone or in combination of two or more.

As the silane coupling agent, a known organic reactive group-containing organoalkoxysilane can be used, and in particular, an organoalkoxysilane having an epoxy group is suitable, for example, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, or the like can be used.
The above silane coupling agents may be used alone or in combination of two or more. In the present invention, the silane coupling agent as described above can be contained within a range of about 1 to 20 parts by mass with respect to 100 parts by mass of the total amount of the alkoxide.

  As the water-soluble polymer, either a polyvinyl alcohol resin or an ethylene / vinyl alcohol copolymer or both can be preferably used. Commercially available resins may be used. For example, as an ethylene / vinyl alcohol copolymer, Kuraray Co., Ltd., Eval EP-F101 (ethylene content: 32 mol%), Nippon Synthetic Chemical Industry Co., Ltd., Soarnol D2908 (ethylene content; 29 mol%) or the like can be used.

  Moreover, as a polyvinyl alcohol-type resin, RS-110 (saponification degree = 99%, polymerization degree = 1,000) made from Kuraray Co., Ltd., Kuraray Poval LM-20SO (degree of saponification = 40%, degree of polymerization = 2,000), GOHSENOL NM-14 manufactured by Nippon Synthetic Chemical Industry Co., Ltd. (degree of saponification = 99%, degree of polymerization = 1,400) and the like can be used.

The content of the water-soluble polymer is preferably in the range of 5 to 500 parts by mass with respect to 100 parts by mass of the metal alkoxide. If the amount is less than 5 parts by mass, the film-forming property of the gas barrier coating film layer (E) is inferior and brittleness tends to increase, and the weather resistance tends to decrease. If the amount exceeds 500 parts by mass, the effect of improving the gas barrier property is reduced. Become a trend.
As the sol-gel method catalyst, an acid or an amine compound is suitable.

  As the amine compound, a tertiary amine that is substantially insoluble in water and soluble in an organic solvent is preferable. Specifically, for example, N, N-dimethylbenzylamine, tripropylamine, tributylamine, tripentylamine and the like can be used. In particular, N, N-dimethylbenzylamine is preferable, and it is preferable to contain, for example, 0.01 to 1.0 part by mass, particularly 0.03 to 0.3 part by mass, per 100 parts by mass of the metal alkoxide. When the amount is less than 0.01 parts by mass, the catalytic effect is too small. When the amount is more than 1.0 parts by mass, the catalytic effect is too strong, the reaction rate becomes too fast, and it tends to be uneven.

  Examples of the acid include mineral acids such as sulfuric acid, hydrochloric acid, and nitric acid, and organic acids such as acetic acid and tartaric acid. The acid content is preferably 0.001 to 0.05 mol, more preferably 0.01 to 0.03 mol, based on the total molar amount of the alkoxy groups of the metal alkoxide. When the amount is less than 0.001 mol, the catalytic effect is too small, and when the amount is more than 0.05 mol part, the catalytic effect is too strong, the reaction rate becomes too fast, and it tends to be uneven.

As the organic solvent, methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butanol and the like can be used.
For the gas barrier coating film layer (E), a coating liquid composed of the resin composition is usually used for conventional roll coating such as a gravure roll coater, spray coating, spin coating, dipping, brush, bar code, applicator, etc. It is formed by applying one or more times by a known means.

A specific example of the method for forming the gas barrier coating film layer (E) will be described below.
First, a metal alkoxide, a water-soluble polymer, a sol-gel method catalyst, water, an organic solvent, and, if necessary, a silane coupling agent and the like are mixed to prepare a coating liquid composed of a resin composition. The polycondensation reaction gradually proceeds in the coating solution.
Next, the coating liquid is applied by a usual method on the gas barrier inorganic vapor deposition layer laminated on the base material layer (A) and dried. By drying, the polycondensation of the alkoxide and vinyl alcohol polymer (and silane coupling agent) further proceeds to form a composite polymer layer. Preferably, a plurality of composite polymer layers can be laminated by repeating the above operation.

  Finally, the laminate coated with the coating solution is heated at a temperature of 20 to 250 ° C., preferably 50 to 220 ° C., for 1 second to 10 minutes. Thereby, a gas barrier coating film layer (E) can be formed on a gas barrier inorganic vapor deposition layer.

  The gas barrier coating film layer (E) may be a composite polymer layer in which one layer or two or more layers are laminated. Further, the thickness of the gas barrier coating film layer (E) after drying is preferably in the range of 0.01 to 100 μm, more preferably 0.1 to 50 μm. If the thickness after drying is less than 0.01 μm, the improvement in gas barrier properties is too small, and if it is greater than 100 μm, cracks are likely to occur.

[Print layer (F)]
The easy-openable gas barrier laminate of the present invention can be applied, for example, between a base material layer (A) and an adhesive layer (B), as shown in FIG. Between (E) and the adhesive layer (B), a printing layer (F) in which characters, figures, symbols, and other desired pictures are arbitrarily formed by a normal printing method can be provided.

[Laminate and packaging material comprising the laminate]
When the conventional easy-open gas barrier laminate includes an AC coat, a metal deposition layer, or the like, the total number of constituent layers is required to be about 8 or more, and therefore the manufacturing process is long and complicated. The easy-opening gas barrier laminate can have a total number of constituent layers smaller than that of the conventional one, and can exhibit an equivalent or higher gas barrier property with 6 layers or less. It is also possible to have a structure of seven layers or more, and it is possible to develop a gas barrier property equal to or higher than that with a relatively smaller total number of constituent layers than the conventional material. Also, since the total number of constituent layers is small and the inorganic vapor deposition layer can be thinned, the process can be shortened and simplified, the laminate can be thinned, the flexibility of the laminate is improved, and the bending resistance Will improve.

  The easy-opening gas barrier laminate of the present invention and the packaging material comprising the easy-opening gas barrier laminate are, as shown in FIG. 1, a gas barrier inorganic material provided on one side of a base material layer (A) and a sealant layer (D). The vapor deposition layer (C) and, as shown in FIG. 2, the gas barrier coating film layer (E) surface of the base material layer (A) provided with the gas barrier inorganic vapor deposition layer and the gas barrier coating film layer (E) on one surface; Further, as shown in FIG. 3, a base material layer (A) provided with a printing layer (F) as necessary, as shown in FIG. 3, on the surface of the gas barrier inorganic vapor deposition layer (C) provided on one side of the sealant layer (D). The printed layer (F) surface and the gas barrier inorganic vapor deposition layer (C) surface provided on one surface of the sealant layer (D) can be laminated through the adhesive layer (B), respectively. .

The easily openable gas barrier laminate of the present invention and the packaging material comprising the laminate are excellent in gas barrier properties, and preferably have an oxygen permeability of 0.05 to 2.0 cc / m ² / in a 23 ° C. and 90% RH environment. day / atm, and the water vapor permeability in an environment of 40 ° C. and 90% RH is 0.01 to 2.0 g / m ² / day / atm.

Furthermore, in general, when a packaging bag is made using a packaging material and the contents are filled with a vertical pillow, the packaging bag is exposed to a physical load due to heat, friction, pressure, etc. Although the gas barrier property is lowered, the packaging bag produced using the easy-open gas barrier packaging material of the present invention has a little deterioration of the gas barrier property after filling with the vertical pillow, and is preferably filled once with a vertical pillow filling machine. The increase in oxygen permeability in the environment of 23 ° C. and 90% RH after applying the load is zero or 10.0 cc / m ² / day / atm or less before applying the bending load, The increase value of the water vapor permeability in the% RH environment from before the bending load is applied is zero or 2.0 g / m ² / day / atm or less.

[Packaging]
The pillow packaging bag of the present invention is a packaging body obtained by pillow packaging the laminate obtained above, and is excellent in gas barrier properties, easy-opening properties, and bending resistance.
The present invention will be specifically described with reference to examples.

(Preparation of resin composition for adhesive)
The following adhesive and solvent were mixed to prepare an adhesive resin composition (A).
Adhesive: PASLIM VM001 / VM102CP (manufactured by DIC Corporation) 19 parts by mass Solvent: 15 parts by mass of ethyl acetate

(Preparation of aluminum vapor deposition easy peel CPP)
Subsequently, a multilayer film of polyethylene / polypropylene + polyethylene / polypropylene was formed to obtain an easy peel CPP film having a thickness of 25 μm.
Furthermore, the obtained easy peel CPP film is induction heated by a wind-up type vacuum vapor deposition machine, and aluminum vapor deposition treatment is performed under 5 × 10 ⁻⁴ Torr as a gas barrier inorganic vapor deposition layer (C). An easy peel CPP (unstretched polypropylene) film A having a thickness of 25 μm and having a 40 nm-thick single-sided aluminum vapor deposition layer was obtained.

[Example 1]
Corona-treated surface of 20 μm OPP (biaxially stretched polypropylene) film (P-2171, manufactured by Toyobo Co., Ltd.) subjected to single-sided corona treatment as the base layer (A) and single-sided aluminum as the sealant layer (D) The vapor-deposited easy peel CPP film A and the aluminum vapor-deposited surface were dry-laminated via an adhesive resin composition (A) as a gas barrier adhesive layer (B).
The application amount of the adhesive resin composition (a) at this time was such that the thickness of the adhesive layer after curing was 3 μm. After lamination, the laminate was aged at 40 ° C. for 3 days to obtain a laminate. About the obtained laminated body, the vertical pillow filling test, gas barrier property, laminate strength, and packaging material seal strength were evaluated. The results are shown in Table 1.
Layer structure: OPP (20 μm) / Gas barrier adhesive (3 μm) / Aluminum deposition (40 nm) / CPP (25 μm)

[Examples 2 to 5]
The thickness of the resin composition for adhesive (a) is the value in the table (1.1, 2.2, 3.3, 4.4 μm)
A laminated body was produced in the same manner as in Example 1 except that the gas barrier property was changed, and the gas barrier property was evaluated.
Layer structure of Example 2: OPP (20 μm) / gas barrier adhesive (1.1 μm) / aluminum deposition (40 nm) / CPP (25 μm)
Layer structure of Example 3: OPP (20 μm) / gas barrier adhesive (2.2 μm) / aluminum deposition (40 nm) / CPP (25 μm)
Layer structure of Example 4: OPP (20 μm) / gas barrier adhesive (3.3 μm) / aluminum deposition (40 nm) / CPP (25 μm)
Layer structure of Example 5: OPP (20 μm) / Gas barrier adhesive (4.4 μm) / Aluminum deposition (40 nm) / CPP (25 μm)

[Example 6]
The following raw materials were mixed to prepare a gas barrier coating film resin composition (A) for the gas barrier coating film layer (E).
Tetraethoxysilane 100 parts by mass Eval EP-F101 20 parts by mass N, N-dimethylbenzylamine 0.2 parts by mass Isopropyl alcohol 300 parts by mass

On the corona-treated surface of a 20 μm OPP (biaxially stretched polypropylene) film (Toyobo Co., Ltd., P-2171) subjected to single-sided corona treatment as the base material layer (A), by a take-up vacuum deposition machine Then, aluminum was induction-heated, and aluminum vapor deposition was performed under 5 × 10 ⁻⁴ Torr to obtain a 20 μm thick OPP film B having a 40 nm thick single-sided aluminum vapor deposition layer as a gas barrier inorganic vapor deposition layer.

Next, the gas barrier coating film resin composition (A) was applied to the gas barrier inorganic vapor-deposited surface of the OPP film B so that the thickness after drying and heating was 2 μm, and was dried by heating at 90 ° C. for 5 minutes. A coating film layer (E) was formed.
An adhesive resin composition as a gas barrier adhesive layer (B) is formed by using the gas barrier coating film layer (E) surface and the aluminum vapor deposition surface of the easy peel CPP film A with single-sided aluminum vapor deposition as the sealant layer (D). Dry lamination was carried out through the object (a).

The amount of the adhesive resin composition (A) applied at this time was such that the thickness of the adhesive layer (B) after curing was 3 μm. After lamination, the laminate was aged at 40 ° C. for 3 days to obtain a laminate. About the obtained laminated body, the vertical pillow filling test, gas barrier property, laminate strength, and packaging material seal strength were evaluated. The results are shown in Table 1.
Layer structure: OPP (20 μm) / Aluminum deposition (40 nm) / Gas barrier coating film (2 μm) / Gas barrier adhesive (3 μm) / Aluminum deposition (40 nm) / CPP (25 μm)

[Comparative Example 1]
A corona-treated surface of a 20 μm OPP film (P-2171, manufactured by Toyobo Co., Ltd.) subjected to single-sided corona treatment as a base material layer, and a 25-μm CPP film subjected to single-sided aluminum vapor deposition treatment (40 nm thickness) as a sealant layer (Toray Film Processing Co., Ltd., 2703) aluminum deposition surface and two-component curable urethane adhesive (Toyo Flex TM-340 / Toyo Morton Co., Ltd. CAT -29).

The amount of the adhesive applied at this time was such that the thickness of the adhesive layer after curing was 3 μm. After lamination, the laminate was obtained by aging treatment at 25 ° C. for 1 day. About the obtained laminated body, gas barrier property, laminate strength, and the amount of solvent contained were evaluated. The results are shown in Table 1.
Layer structure: OPP (20 μm) / 2-component curable urethane adhesive (3 μm) / aluminum deposition (40 nm) / CPP (25 μm)

[Comparative Example 2]
Corona-treated surface of a 20 μm OPP film (P-2171, manufactured by Toyobo Co., Ltd.) subjected to single-sided corona treatment as a base material layer, and 12 μm PET film subjected to single-sided aluminum vapor deposition treatment (40 nm thickness) as a sealant layer The aluminum vapor deposition surface of Toray Film Processing Co., Ltd. (1310) and a two-component curable urethane adhesive (manufactured by Toyo Morton Co., Ltd., Tomoflex TM-340 / Toyo Morton Co., Ltd. CAT) -29).

The amount of the adhesive applied at this time was such that the thickness of the adhesive layer after curing was 3 μm. Next, a non-deposition surface of the laminated PET and a corona-treated surface of a CPP film (P-1128, manufactured by Toyobo Co., Ltd.) subjected to a single-sided corona treatment are combined with a two-component curable urethane adhesive (Toyo Morton). (Tomoflex TM-340 / Toyo Morton Co., Ltd. CAT-29). After lamination, the laminate was obtained by aging treatment at 25 ° C. for 1 day.
About the obtained laminated body, gas barrier property, laminate strength, and the amount of solvent contained were evaluated. The results are shown in Table 1.
Layer structure: OPP (20 μm) / 2-component curable urethane adhesive (3 μm) / aluminum deposition (40 nm) / PET (12 μm) / 2-component curable urethane adhesive (3 μm) / CPP (25 μm)

[Comparative Example 3]
AC coating (P-1000 manufactured by DICG Co., Ltd., coating coat, thickness after drying) on the corona-treated surface of a 20 μm OPP film (Toyobo Co., Ltd., P-2171) subjected to single-sided corona treatment as a base material layer 3 g / m ² ), and the aluminum vapor deposition surface of a 12 μm PET film (manufactured by Toray Film Processing Co., Ltd., 1310) subjected to single-sided aluminum vapor deposition treatment (40 nm thickness), and low density polyethylene (Nippon Polyethylene Co., Ltd. , LC600A.). The thickness of polyethylene was adjusted to 7 μm.

Next, AC coating is performed on the non-deposition surface of the laminated aluminum vapor-deposited PET, and the AC-coated surface and an 18 μm CPP film (TAF-513, manufactured by Mitsui Chemicals, Inc.) are provided. Then, extrusion lamination was performed through low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., LC600A). The thickness of polyethylene was adjusted to 7 μm. After lamination, the laminate was aged at 25 ° C. for 1 day to obtain a laminate, which is a conventional gas barrier laminate, and evaluated in the same manner.
Layer structure: OPP (20 μm) / AC coat / PE (7 μm) / Aluminum deposition (40 nm) / PET (12 μm) / AC coat / PE (7 μm) / CPP (18 μm)

[Comparative Example 4]
A laminate was prepared and the gas barrier property was evaluated in the same manner as in Example 1 except that the thickness after curing of the adhesive layer (B) was changed to the thickness (0.55 μm) shown in Table 1. .
Layer structure: OPP (20 μm) / Gas barrier adhesive (0.55 μm) / Aluminum deposition (40 nm) / CPP (25 μm)

<Evaluation>
[Vertical pillow filling]
Under the following conditions, the vertical pillow filling property was evaluated using empty bags without contents.
Filling machine: KBF-6100 (manufactured by Kawashima Seisakusho Co., Ltd.)
Packaging bag size: width 200mm x height 240mm
Sealing conditions: vertical seal 140 ° C, horizontal seal 150 ° C
Number of shots: 30 / min

[Gas barrier properties]
(1) Oxygen permeability Each laminate was cut into A4 size, and oxygen permeability (cc / m ² / day / atm) under conditions of 23 ° C. and 90% RH using OXTRAN 2/20 manufactured by MOCON USA. ) Was measured.
(2) Water vapor permeability Each laminate was cut into A4 size, and PERMATRAN 3/31 manufactured by MOCON USA was used, and the water vapor permeability (g / m ² / day / atm) under the conditions of 40 ° C. and 90% RH. ) Was measured.
(3) After vertical pillow filling After carrying out the filling test of each laminated body using the vertical pillow filling machine, oxygen permeability and water vapor permeability were measured under the same method and conditions as described above.

[Laminating properties]
Each laminate obtained in each Example and each Comparative Example was cut into a strip of 15 mm in width, and a 25 ° C. atmosphere using a Tensilon tensile tester (RTC-1310A manufactured by Orientec Co., Ltd.). Below, the maximum load when the base material layer and the sealant layer were peeled was measured by a T-shaped peeling method (tensile speed: 50 mm / min) to obtain a laminate strength (N / 15 mm). Furthermore, the peeling interface part was confirmed. The notations in Table 1 have the following meanings. The laminate strength was determined to be 1N / 15 mm or more.
VM / CPP: peeling at the interface between the aluminum vapor deposition layer and the CPP layer PE / VM: peeling at the interface between the polyethylene layer and the aluminum vapor deposition layer Contact / VM: peeling at the interface between the adhesive layer and the aluminum vapor deposition layer

[Packaging material seal strength]
Each laminate obtained in each Example and each Comparative Example was cut into a strip of 15 mm in width, and a 25 ° C. atmosphere using a Tensilon tensile tester (RTC-1310A manufactured by Orientec Co., Ltd.). Below, the maximum load when the sealant layer was peeled was measured by a T-shaped peeling method (tensile speed: 50 mm / min) to obtain a packaging material seal strength (N / 15 mm). 2-20N / 15mm was set as the pass.

[Result Summary]
In Examples 1 to 6, although the total number of constituent layers is 4 to 6 layers, the longitudinal pillow filling property, the oxygen permeability before and after filling, the water vapor permeability before and after filling, and the laminate The balance between strength, peel interface and packaging material seal strength was shown, and the gas barrier property equal to or more than that of Comparative Example 3 in which the total number of constituent layers of the conventional gas barrier laminate was 8 layers was shown.

  However, Comparative Examples 1 and 2 which do not have the gas barrier adhesive layer (B) and the easy-open sealant layer (D) have an increase in oxygen permeability before filling and / or oxygen permeability after filling. The value became high and the comparative example 2 showed the result that the packaging material seal | sticker strength was too high and was inferior to easy-opening property. Comparative Example 3, which is a conventional gas barrier laminate, has a gas barrier property equivalent to that of the example by having eight layers having a total number of constituent layers larger than that of the example. Since Comparative Example 4 in which the thickness of the gas barrier adhesive layer (B) was too thin did not show sufficient oxygen permeability before filling, the subsequent evaluation was interrupted.

Claims (11)

An easily openable gas barrier laminate having at least a base material layer (A), a gas barrier adhesive layer (B), a gas barrier inorganic vapor deposition layer (C), and an easily openable sealant layer (D). And
The gas barrier inorganic vapor deposition layer (C) and the adhesive layer (B) are laminated adjacently,
The thickness of the adhesive layer (B) is 0.5 to 6.0 μm.
Easy-open gas barrier laminate.   Furthermore, it is a gas barrier laminate having a gas barrier coating film layer (E) between the base material layer (A) and the adhesive layer (B), and the gas barrier coating film layer (E) is composed of a metal alkoxide and a water-soluble layer. The easily openable gas barrier laminate according to claim 1, which contains a sol-gel hydrolysis polycondensate of a mixture with a polymer.   Furthermore, the easily openable gas barrier laminated body of Claim 1 or 2 which has a printing layer (F) between a base material layer (A) and an adhesive bond layer (B).   The gas barrier inorganic vapor deposition layer (C) is a layer having one or more selected from the group consisting of an aluminum vapor deposition layer, an alumina vapor deposition layer, and a silica vapor deposition layer. The easily openable gas barrier laminate as described in 1.   The easily openable gas barrier laminate according to any one of claims 1 to 3, wherein the gas barrier inorganic vapor deposition layer (C) is a layer having an aluminum vapor deposition layer.   The easily openable gas barrier laminate according to any one of claims 1 to 5, wherein the gas barrier inorganic vapor-deposited layer (C) has a thickness of 1 to 100 nm. The oxygen permeability in a 23 ° C. 90% RH environment is 0.05 to 2.0 cc / m ² / day / atm, and the water vapor permeability in a 40 ° C. 90% RH environment is 0.01 to 2.0 g. / m is ² / day / atm, the oxygen barrier and a moisture barrier, the easy-open gas-barrier laminate according to any one of claims 1 to 6. After applying a filling load once with a vertical pillow filling machine,
The increase value of oxygen permeability under a 23 ° C. and 90% RH environment from before the bending load is applied is zero or 10.0 cc / m ² / day / atm or less,
The increase in water vapor permeability under a 40 ° C. and 90% RH environment from before the bending load is applied is zero or 5.0 g / m ² / day / atm or less.
The easily openable gas barrier laminated body of any one of Claims 1-7.   The easily openable gas barrier laminate according to any one of claims 1 to 7, wherein the total number of constituent layers is 6 or less.   An easily openable gas barrier packaging material using the easily openable gas barrier laminate according to any one of claims 1 to 9.   A pillow packaging bag using the easy-open gas barrier laminate according to any one of claims 1 to 9.

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