JP2018171797A - Easily openable gas barrier laminate using solventless adhesive, and easily openable gas barrier packaging material and easily openable pillow packaging bag comprising the laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated body having excellent easy-opening property and gas barrier property and also excellent bending resistance, and a packaging material using the laminated body. Means for Solving the Problems At least, a base material layer (A), a solvent-free gas barrier organic adhesive layer (B), a gas barrier inorganic vapor deposition layer (C), and an easily openable sealant layer (D). An easily openable gas barrier laminated body having the above, the gas barrier inorganic vapor deposition layer (C) and the solvent-free gas barrier organic adhesive layer (B) are laminated adjacent to each other, and the solvent-free gas barrier organic adhesive layer (B) is a layer formed by applying a two-component curable solvent-free adhesive and further curing, having a thickness of 0.5 to 6 μm and a solvent content of zero or 6 mg / m2 or less. An easily-openable gas barrier laminate having an easily-openable gas barrier laminate, a gas-barrier coating film layer and a printing layer, and an easily-openable gas barrier packaging material using the easily-openable gas barrier laminate. [Selection diagram] Fig. 1

Description

The present invention includes at least a base material layer (A), a solventless gas barrier organic adhesive layer (B), a gas barrier inorganic vapor deposition layer (C), and an easily openable sealant layer (D), The vapor deposition layer (C) and the solventless gas barrier organic adhesive layer (B) are adjacent to each other. The solventless gas barrier organic adhesive layer (B) is coated with a two-component curable solventless adhesive. A layer formed by curing, and the solvent content of the solventless gas barrier organic adhesive layer (B) is zero or 6 mg / m ² or less. The present invention relates to an easy-opening gas barrier laminate having a film layer (E) and / or a printing layer (F), a gas barrier packaging material comprising the easy-opening gas barrier laminate, and a pillow packaging bag. Oxygen barrier and water vapor barrier It relates Excellent (permeability of oxygen and water vapor is reduced) a laminate and laminate packaging material and pillow packaging bags. The packaging material of the present invention is most suitable for 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 water in the outside air is easily taken in. In No. 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 when the bending load is applied, There is a problem that it 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 production of a laminate, and is excellent in easy-opening property, gas barrier property and bending resistance, and the laminate It aims at providing the packaging material which consists of, and a pillow packaging bag.

As a result of various studies, the present inventor has at least a base material layer (A), a solventless gas barrier organic 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 solventless gas barrier organic adhesive layer (B) are adjacent to each other, and the solventless gas barrier organic adhesive layer (B) is composed of two liquids. An easily openable gas barrier, which is a layer formed by applying and curing a curable solventless adhesive, and the solvent content of the solventless gas barrier organic adhesive layer (B) is zero or 6 mg / m ² or less. An easily openable gas barrier laminate having a laminate, and further a gas barrier coating film layer (E) and / or a printing layer (F), and an easily openable gas barrier packaging material comprising the easily openable gas barrier laminate. Gas barrier inorganic vapor deposition layer (C) By forming in contact with the solvent-free gas barrier organic adhesive layer using a liquid curing type non-solvent adhesive (B), it was found to achieve the above object.
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 solventless gas barrier organic 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 solventless gas barrier organic adhesive layer (B) are laminated adjacent to each other, and the solventless gas barrier organic adhesive layer (B) is a two-component curable type. It is a layer formed by applying a solventless adhesive and further curing, and the thickness of the solventless gas barrier organic adhesive layer (B) is 0.5 to 6 μm, and the solventless gas barrier organic adhesive layer The solvent content of (B) is zero or 6 mg / m ² or less, an easily openable gas barrier laminate.
2. Furthermore, an easily openable gas barrier laminate having a gas barrier coating film layer (E) between the base material layer (A) and the solventless gas barrier organic adhesive layer (B), the gas barrier coating film layer (E) is an easily openable gas barrier laminate according to the above 1, which contains a sol-gel hydrolysis polycondensate of a mixture of a metal alkoxide and a water-soluble 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 a solventless type gas barrier organic 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.
7.2 Oxygen permeability in an environment of 23 ° C. and 90% RH is 0.05 to 2.0 cc / m ² / da
y / 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, for oxygen barrier and water vapor barrier, The easily openable gas barrier laminate according to any one of the above.
8). The increase in oxygen permeability in the environment of 23 ° C. and 90% RH after applying the bending load 5 times with the gelboflex tester is zero or 10.0 cc / m ² / Day / atm or less, and the increase in water vapor permeability under a 40 ° C. and 90% RH environment from before the bending load is applied is zero or 2.0 g / m ² / day / atm or less. The easily openable gas barrier laminated body in any one of -7.
9. The easily openable gas barrier laminate according to any one of 1 to 8 above, 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. An easy-open pillow packaging bag using the easy-open gas barrier laminate according to any one of 1 to 9 above.

The easy-opening gas barrier laminate and the easy-opening gas barrier packaging material comprising the easy-opening gas barrier laminate of the present invention include at least a base layer (A), a solventless gas barrier organic adhesive layer (B), and a gas barrier inorganic material. A vapor-deposited layer (C), and an easily-openable sealant layer (D), wherein the gas barrier inorganic vapor-deposited layer (C) and the solventless gas-barrier organic adhesive layer (B) are in contact with each other; The solvent-type gas barrier organic adhesive layer (B) is a layer formed by applying and curing a two-component curable solventless adhesive, and has a thickness of 0.5 to 6 mm and a solvent content of zero or 6 mg / m ² or less, an easily openable gas barrier laminate, preferably further comprising a gas barrier coating film layer (E) and / or a printing layer (F), and a gas barrier inorganic vapor deposition layer (C) Solvent-free gas barrier organic adhesion By combining the layer (B) adjacent to each other, the concave and convex portions formed on the surface of the gas barrier inorganic vapor deposition layer (C) are filled with the solventless gas barrier organic adhesive layer (B) and flattened. The gas barrier property in the direction is made uniform, and the gas barrier inorganic vapor-deposited layer is thinned to maintain the bending resistance, while exhibiting high gas barrier property equal to or higher than the conventional one with a small total number of constituent layers. Further, since the solvent-free gas barrier organic adhesive layer (B) is solvent-free and the solvent content is zero or 6 mg / m ² or less, further improvement of gas barrier properties and transfer of solvent odor to contents Can be reduced. Moreover, since it has an easily openable sealant layer (D), a package can express an easily openable property.

It is a schematic sectional drawing which shows the example about the layer structure of the gas barrier laminated body of this invention. It is a schematic sectional drawing which shows another example about the layer structure of the gas barrier laminated body of this invention. It is a schematic sectional drawing which shows another example about the layer structure of the 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 easy-open 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 easy-open gas barrier laminate of the present invention comprises a base material layer (A), a solventless gas barrier organic adhesive layer (B), a gas barrier inorganic vapor-deposited layer (C), and an easy-open The basic structure is a structure formed by laminating a porous sealant layer (D).

  As another embodiment of the easy-open gas barrier laminate of the present invention, as shown in FIG. 2, a gas barrier inorganic material is further provided between the base material layer (A) and the solventless gas barrier organic adhesive layer (B). The gas barrier inorganic vapor deposition layer separate from the vapor deposition layer (C) and the gas barrier coating film layer (E) may be laminated.

  As still another aspect of the easy-open gas barrier laminate of the present invention, as shown in FIG. 3, a printed layer (B) is interposed between the base material layer (A) and the solventless gas barrier organic adhesive layer (B). The structure which laminated | stacked F) may be sufficient.

  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 of 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 film such as polyethylene terephthalate and polyethylene naphthalate, uniaxial or biaxially stretched polyamide film 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 each adhesive layer, such as a solventless type gas barrier organic adhesive layer (B), or a gas barrier inorganic vapor deposition layer (C). In order to improve the adhesion to each inorganic vapor deposition layer, the surface of the base material layer (A) and the film or sheet constituting the base material layer (A) before laminating or vapor deposition, if necessary, in advance , Corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, physical treatment such as glow discharge treatment, chemical treatment such as oxidation treatment using chemicals, adhesive layer , A primer coating agent layer, an undercoat layer, or a treatment for forming a deposition anchor coating agent layer, etc., and other treatments may be performed, and an inorganic deposition layer is provided after the surface treatment, and further on the inorganic deposition layer It may be configured to provide a barrier coating layer, such as a gas barrier coating film layer described later (E).

(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.

[Solvent-free gas barrier organic adhesive layer (B)]
The solventless gas barrier organic adhesive layer (B) in the easy-open gas barrier laminate of the present invention is formed without a solvent and has a gas barrier property, particularly a barrier property against oxygen and water vapor.
The solvent content in the solventless gas barrier organic adhesive layer (B) is zero or 6 mg / m ² or less. In order to keep the solvent content low, the curable isocyanate resin composition for forming the solventless gas barrier organic adhesive layer (B) needs to be a two-component curable solventless adhesive. The two-component curable solventless adhesive is used by heating to lower the viscosity while laminating without laminating.
When a highly polar solvent is used in the curable isocyanate resin composition, workability is poor. For example, when a highly soluble solvent such as acetone is used, the boiling point is low and water from outside air is taken in. Therefore, there is a problem that the viscosity of the curable isocyanate resin composition is likely to increase due to the reaction between water and isocyanate.

  Moreover, when the solvent-free gas barrier organic adhesive layer (B) contains a large amount of solvent, there is a concern that the adhesion between the layers of the laminate is weakened by the solvent, and furthermore, the obtained laminate is used. In a package made of a packaging material, there is a concern that the solvent odor may be transferred to the contents. Still further, due to volume shrinkage during drying, the solventless gas barrier organic adhesive layer (B) embedded in the concave and convex portions formed on the surface of the gas barrier inorganic vapor-deposited layer (C) is peeled off to cause defects. As a result, the gas barrier property is liable to be lowered, and even when the laminate is bent, peeling from the concave portion is increased, and the gas barrier property is likely to be deteriorated.

  The thickness of the solventless gas barrier organic 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.

(Two-component curable solventless adhesive)
The two-part curable solventless adhesive forming the gas barrier organic adhesive layer (B) is, for example, a polyol (J) having two or more hydroxyl groups in one molecule and two or more isocyanate groups in one molecule. And a two-component curable solventless adhesive containing the isocyanate compound (K) and the phosphoric acid-modified compound (L). Here, the main skeleton of the polyol (J) having two or more hydroxyl groups in one molecule is a polyester structure or a polyester polyurethane structure, and 70 of the structure part derived from polyvalent carboxylic acids in the polyester structure or the polyester polyurethane structure. ˜100% by mass is derived from ortho-oriented aromatic dicarboxylic acids.

  The polyvalent carboxylic acids refer to polyvalent carboxylic acids and their anhydrides and ester-forming derivatives, and the ortho-oriented aromatic dicarboxylic acids refer to ortho-oriented aromatic dicarboxylic acids and their anhydrides and ester-forming derivatives. .

  The two-component curable solventless adhesive further comprises a plate-like inorganic compound (M), a polyester polyol (P) having two or more hydroxyl groups in one molecule, one or two or more in one molecule. 1 type or 2 types or more of the group which consists of the polyhydric carboxylic acid modified polyester polyol (N) which has a carboxyl group and two or more hydroxyl groups may be contained.

  In particular, it contains a polycarboxylic acid-modified polyester polyol (N) and an isocyanate compound (K) having two or more isocyanate groups in one molecule, and has an acid value of 20 mgKOH / g or more. Solvent adhesives are preferred.

  The glass transition temperature of the cured coating film of the two-component curable solventless adhesive is preferably in the range of −30 ° C. to 80 ° C., more preferably 0 ° C. to 70 ° C., and further preferably 25 ° C. to 70 ° C. 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.

As a specific example of the curable isocyanate resin composition for the adhesive layer having an oxygen barrier property although it is a type containing a solvent, an oxygen barrier adhesive path rim (PASLIM) sold by DIC Corporation is available. Series of PASLIMVM001 / VM102C
P etc. are mentioned.

(Polyol (J))
The polyol (J) has two or more hydroxyl groups in one molecule, the main skeleton has a polyester structure or a polyester polyurethane structure, and a structure portion derived from polyvalent carboxylic acids in the polyester structure or the polyester polyurethane structure is 70. ˜100% by mass is derived from ortho-oriented aromatic dicarboxylic acids.

  Here, the polyester portion of the main skeleton structure is obtained by polycondensation reaction of a polyvalent carboxylic acid and a polyhydric alcohol by a known and conventional 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.

(Polyvalent carboxylic acid-modified polyester polyol (N))
The polyvalent carboxylic acid-modified polyester polyol (N) having one or two or more carboxyl groups and two or more hydroxyl groups in one molecule is one of the hydroxyl groups of the polyester polyol having three or more hydroxyl groups in one molecule. It is obtained by reacting a polyvalent carboxylic acid with the part.

(Plate-like inorganic compound (M))
The plate-like inorganic compound (M) has an effect of improving the laminate strength and oxygen barrier property of the solventless gas barrier organic adhesive layer (B).
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 structure in which the gas barrier inorganic vapor-deposited layer (C) and the solvent-type gas barrier organic adhesive layer (B) are in contact with each other, so that the superstructure generated on the surface of the gas barrier inorganic vapor-deposited layer (C). By having a flattened structure in which fine concave and convex concave portions are filled with a solvent-type gas barrier organic adhesive layer (B) having gas barrier properties, the gas barrier properties in the plane direction are made uniform, and the gas barrier inorganic vapor deposition layer (C ), The gas barrier property can be exhibited higher than the conventional one while maintaining the bending resistance.

  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 a solventless gas barrier organic adhesive (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 solventless gas barrier organic 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 improve 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 added to the base layer (A). It can also be provided on the side in contact with the solvent-type gas barrier organic adhesive 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 is further provided between the base material layer (A) and the solvent-type gas barrier organic adhesive layer (B) in order to enhance the barrier property to gases such as oxygen gas and water vapor. (E) can be provided. The gas barrier coating film layer (E) may be provided on the gas barrier inorganic vapor deposition layer laminated on the base material layer (A).

The gas barrier coating film layer (E) is obtained by hydrolysis of a metal alkoxide obtained by polycondensation of a mixture of a metal alkoxide and a water-soluble polymer by a sol-gel method in the presence of a sol-gel catalyst, water, an organic solvent, or the like. It is preferably a layer formed from a resin composition such as a product or 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) tends to be inferior and brittleness tends to increase, and the weather resistance tends to decrease. Tend to be.

  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 suitable, and it is preferable to contain, for example, 0.01 to 1.0 part by weight, particularly 0.03 to 0.3 part by weight, per 100 parts by weight 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.

The gas barrier coating film layer (E) is a coating liquid composed of the resin composition, such as a roll coating such as a gravure roll coater, spray coating, spin coating, dipping, brush, barcode, applicator, etc. It is formed by applying one or more times by a conventionally known means.
Specific examples 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. The thickness of the dried gas barrier coating film layer (E) 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)]
As shown in FIG. 3, the easy-open gas barrier laminate of the present invention, for example, between the substrate layer (A) and the solventless gas barrier organic adhesive layer (B), as shown in FIG. As shown in FIG. 3, between the gas barrier coating film layer (E) and the solventless gas barrier organic adhesive layer (B), characters, figures, symbols, and other desired patterns are converted into a normal printing method. The printing layer (F) arbitrarily formed can be provided.

[Laminate and packaging material comprising the laminate]
When the conventional easy-open gas barrier laminate includes an AC coat, a metal vapor-deposited layer, etc., the total number of constituent layers is about 8, which makes the manufacturing process long and complicated. In the reactive gas barrier laminate, the total number of constituent layers can be made smaller than before, and can be 6 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.

  As shown in FIG. 1, the laminate of the present invention and the packaging material comprising the laminate comprise a base material layer (A) and a gas barrier inorganic vapor deposition layer (C) provided on one side of the sealant layer (D). Further, 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 side, and the sealant layer (D). The gas barrier inorganic vapor-deposited layer (C) surface provided on one side of the base material layer (A) provided with a print layer (F) as required, as shown in FIG. It can be produced by laminating the surface and the gas barrier inorganic vapor deposition layer (C) surface provided on one surface of the sealant layer (D) via the solventless gas barrier organic adhesive layer (B).

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, generally, when a packaging bag is produced by folding, heating and crimping using a packaging material and the contents are filled with a vertical pillow, the packaging bag is physically loaded by heat, friction, pressure, etc. However, the packaging bag produced using the gas barrier packaging material of the present invention has little degradation of the gas barrier property, and preferably 5 times with a gelbo flex tester. After the bending load is applied, the increase in oxygen permeability in 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.

[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 and flex resistance.
The present invention will be specifically described with reference to examples.

[Production of two-component curable solventless adhesive A]
The following raw materials are put into a polyester reaction vessel equipped with a rectifying tube and a water separator and gradually heated. Under a nitrogen atmosphere, the esterification reaction is carried out while maintaining the reaction liquid temperature 220 ° C. and the vapor temperature 100 ° C. The esterification reaction was terminated when the acid value of the reaction solution reached 1 mg KOH / g or less, and the solution temperature was cooled to 120 ° C.
Phthalic anhydride 241.9 parts by mass Ethylene glycol 105.4 parts by mass Glycerol 75.2 parts by mass Titanium tetraisopropoxide 0.042 parts by mass

Next, the following raw materials were added to the reaction liquid, and the polyvalent carboxylic acid modification reaction was allowed to proceed while maintaining the liquid temperature at 120 ° C., and the acid value was approximately half of the acid value calculated from the charged amount of maleic anhydride. At the end, the esterification reaction was terminated and cooled to obtain a polyvalent carboxylic acid-modified polyester polyol A.
The characteristics of the polyvalent carboxylic acid-modified polyester polyol A obtained by 77.5 parts by mass of maleic anhydride are as follows.
Number average molecular weight: about 520,
Hydroxyl value: 216.6 mg KOH / g,
Acid value: 96.2 mgKOH / g
Number of hydroxyl groups per molecule: 2 (design value)
Number of carboxyl groups per molecule: 1 (design value)

Next, as a isocyanate compound, “Desmodur N3200” manufactured by Sumika Bayer Urethane (biuret of hexamethylene diisocyanate. Number of isocyanate groups per molecule: 2 ) and “Takenate 500” (metaxylylene diisocyanate manufactured by Mitsui Chemicals, Inc. 1 The polyvalent carboxylic acid-modified polyester polyol A obtained above is heated to 80 ° C. at the following blending ratio, uniformly mixed, cooled, and cooled in two parts. A moldless solvent-free adhesive A was obtained.
Polycarboxylic acid-modified polyester polyol A 100 parts by mass Desmodur N3200 49.5 parts by mass Takenate 500 28.9 parts by mass

[Example 1]
Corona-treated surface of a 20 μm OPP (biaxially oriented polypropylene) film (P-2171, manufactured by Toyobo Co., Ltd.) subjected to single-sided corona treatment as a base material layer, and single-sided aluminum vapor deposition treatment (40 nm thickness) as a sealant layer The aluminum deposited surface of the 25 μm CPP (unstretched polypropylene) film (manufactured by Toray Film Processing Co., Ltd., 2703) was non-solvent laminated through a two-component curable solventless adhesive A. 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 aged at 40 ° C. for 3 days to obtain a laminate. 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) / solvent-free gas barrier organic adhesive (3 μm) / aluminum deposition (40 nm) / CPP (25 μm)

[Example 2]
As a sealant layer, CPP with a thickness of 25 μm (P1128, manufactured by Toyobo Co., Ltd., single-sided corona treatment) was replaced with single-sided alumina vapor deposition (20 nm thickness) instead of CPP with a thickness of 25 μm subjected to single-sided aluminum deposition Except having used, it carried out similarly to Example 1, the laminated body was obtained, and evaluated similarly. The conditions for single-sided alumina deposition are as follows.
Layer structure: OPP (20 μm) / solvent-free gas barrier organic adhesive (3 μm) / alumina deposition (20 nm) / CPP (25 μm)
<Vapor deposition conditions>
Deposition surface: Corona-treated surface Vacuum degree in the vacuum chamber; 2-6 × 10 ⁻⁶ mBar
Degree of vacuum in the deposition chamber: 2-5 × 10 ^-3 mBar
Cooling and electrode drum power supply: 10kW
Line speed: 100m / min
Next, immediately after forming the alumina deposited film having a thickness of 200 mm (20 nm) as described above, a glow discharge plasma generator was used on the surface of the deposited alumina film, the power was 9 kW, oxygen gas: argon gas = 7. Using a mixed gas consisting of 0: 2.5 (unit: s1 m), oxygen / argon mixed gas plasma treatment was performed at a mixed gas pressure of 6 × 10 ⁻³ Torr, and the surface tension of the deposited film surface of alumina was 54 dyne / A plasma-treated surface improved by at least cm was formed.

[Example 3]
As a sealant layer, CPP with a thickness of 25 μm (P1128, manufactured by Toyobo Co., Ltd., single-sided corona treatment) was replaced with a single-sided silicon oxide vapor-deposited (20 nm thick) instead of the 25 μm-thick CPP that was vapor-deposited on one side. Example 1 was performed in the same manner as in Example 1, and a laminate was obtained and evaluated in the same manner. The single-sided silicon oxide deposition process conditions are as follows.
Layer structure: OPP (20 μm) / solvent-free gas barrier organic adhesive (3 μm) / silicon oxide deposition (20 nm) / CPP (25 μm)
<Vapor deposition conditions>
Deposition surface: Corona-treated surface Introduction gas: Hexamethyldisiloxane / oxygen gas / helium = 1.0 / 3.0 / 3.0 (unit: s1 m)
Degree of vacuum in the vacuum chamber: 2-6 × 10 ⁻⁶ mBar
Degree of vacuum in the deposition chamber: 2-5 × 10 ^-3 mBar
Cooling and electrode drum power supply: 10kW
Line speed: 100m / min
Next, immediately after the silicon oxide vapor deposition film having a thickness of 200 mm (20 nm) is formed as described above, a glow discharge plasma generator is used on the silicon oxide vapor deposition film surface, the power is 9 kw, oxygen gas: argon gas = Using a mixed gas of 7.0: 2.5 (unit: s1 m) and performing oxygen / argon mixed gas plasma treatment at a mixed gas pressure of 6 × 10 ⁻³ Torr, the surface tension of the silicon oxide deposition film surface A plasma-treated surface with an improvement of 54 dyne / cm or more was formed.

[Comparative Example 1]
The two-pack curable solventless adhesive A is replaced with a two-pack curable urethane adhesive (Toyoflex TM-340 / Toyo Morton CAT-29, manufactured by Toyo Morton Co., Ltd.), and aging conditions Was performed in the same manner as in Example 1 except that the temperature was changed to 25 ° C. for 1 day, and a laminate was obtained and evaluated in the same manner.
Layer structure: OPP (20 μm) / 2-component curable urethane adhesive (3 μm) / aluminum deposition (40 nm) / CPP (25 μm)

[Comparative Example 2]
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.

After AC coating (P-1000 made by DICG Co., Ltd., coating coat) on the corona-treated surface of 20 μm OPP (biaxially stretched polypropylene) film (Toyobo Co., Ltd., P-2171) subjected to single-sided corona treatment, after drying thickness 3 g / m ^2), and said the AC coated surface, a PET film of 12 [mu] m, which is one side aluminized by the following deposition conditions (Toyobo Co., Ltd., biaxially oriented PET film, E-5100. thickness 12 [mu] m, The aluminum vapor-deposited surface of the single-sided corona treatment was laminated by extrusion lamination through low density polyethylene (manufactured by 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 easy-open 25-μm easy peel CPP film A are combined with low-density polyethylene (Nippon Polyethylene Co., Ltd.). Manufactured and manufactured by 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 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 (25 μm)
<Vapor deposition conditions>
Deposition surface: Corona-treated surface Vacuum degree in the vacuum chamber; 2-6 × 10 ⁻⁶ mBar
Degree of vacuum in the deposition chamber: 2-5 × 10 ^-3 mBar
Cooling and electrode drum power supply: 10kW
Line speed: 100m / min
Next, immediately after the aluminum vapor deposition film having a thickness of 400 mm (40 nm) is formed as described above, a glow discharge plasma generator is used on the aluminum vapor deposition film surface, and the power is 9 kW, oxygen gas: argon gas = 7. Using a mixed gas consisting of 0: 2.5 (unit: s1 m), oxygen / argon mixed gas plasma treatment was performed at a mixed gas pressure of 6 × 10 ⁻³ Torr, and the surface tension of the deposited aluminum film surface was 54 dyne / A plasma-treated surface improved by at least cm was formed.

[Comparative Example 3]
A laminate was obtained and evaluated in the same manner as in Example 1 except that the solventless gas barrier organic adhesive was replaced with the following solvent-containing gas barrier organic adhesive.
Layer structure: OPP (20 μm) / solvent gas barrier organic adhesive (3 μm) / aluminum deposition (40 nm) / CPP (25 μm)
(Preparation of solvent-containing gas barrier organic adhesive)
The following adhesive and solvent were mixed to prepare a solvent-containing gas barrier organic adhesive.

Adhesive: PASLIM VM001 / VM102CP (manufactured by DIC Corporation) 19 parts by mass Solvent: 15 parts by mass of ethyl acetate

<Evaluation>
[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.
VM / CPP: peeling at the interface between the vapor deposition layer and the CPP layer PE / VM: peeling at the interface between the polyethylene layer and the vapor deposition layer Contact / VM: peeling at the interface between the adhesive layer and the vapor deposition layer

[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 bending load After applying bending load 5 times with a gelbo flex tester, oxygen permeability and water vapor permeability were measured under the same method and conditions as described above.

[Amount of solvent]
The total amount (mg / m ² ) of toluene, ethyl acetate, IPA, methanol, and MEK in the film was measured by the DNP method. A total amount of zero or 6 mg / m ² or less was regarded as acceptable.

[Result Summary]
Examples 1-6 showed the gas barrier property equivalent to or more than the comparative example 3 which is a conventional gas barrier laminated body with a total number of 8 layers although the total number of layers is 4 layers.

Solvent-free gas barrier organic adhesive layer (B) formed using two-component curable solvent-free adhesive A
Examples 1 to 6 having a thickness of 0.5 to 6 μm and having an easy-open sealant layer (D) are superior to Comparative Examples 1 to 3 using a conventional two-component curable urethane adhesive. In addition, the solvent content of the solvent-free gas barrier organic adhesive layer (B) was low, and the sealing strength of the packaging material was good. However, Comparative Example 4 in which the thickness of the solventless gas barrier organic adhesive layer (B) is only 0.1 μm showed an insufficient gas barrier property.

  Moreover, the comparative examples 1 and 2 using the usual 2 liquid curable urethane adhesive containing a solvent had much solvent content of an adhesive bond layer.

Claims (11)

An easily openable gas barrier laminate having at least a base material layer (A), a solventless gas barrier organic adhesive layer (B), a gas barrier inorganic vapor deposition layer (C), and an easily openable sealant layer (D). Because
The gas barrier inorganic vapor deposition layer (C) and the solventless gas barrier organic adhesive layer (B) are laminated adjacent to each other,
The solventless gas barrier organic adhesive layer (B) is a layer formed by applying a two-component curable solventless adhesive and further curing.
The thickness of the solventless gas barrier organic adhesive layer (B) is 0.5 to 6 μm,
The solvent content of the solventless gas barrier organic adhesive layer (B) is zero or 6 mg / m ² or less.
Easy-open gas barrier laminate.   Furthermore, an easily openable gas barrier laminate having a gas barrier coating film layer (E) between the base material layer (A) and the solventless gas barrier organic adhesive layer (B), the gas barrier coating film layer The easily openable gas barrier laminate according to claim 1, wherein (E) contains a sol-gel hydrolysis polycondensate of a mixture of a metal alkoxide and a water-soluble 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 a solventless type gas barrier organic 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 ² / day / atm.
The easily openable gas barrier laminate according to any one of claims 1 to 6, which is used for an oxygen barrier and a water vapor barrier. After applying bending load 5 times with a gelbo flex tester,
The increase value of oxygen permeability in a 23 ° C. and 90% RH environment from before giving the bending load is zero or 10.0 cc / 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 8, 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. An easily openable pillow packaging bag using the easily openable gas barrier laminate according to any one of claims 1 to 9.

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