JP2020040259A - Laminate for packaging material and packaging material - Google Patents

Abstract

To provide a laminate for a packaging material capable of obtaining a packaging material having excellent recyclability while having strength or barrier properties as a packaging material.SOLUTION: There is provided a laminate for a packaging material which comprises a substrate and a heat seal layer, wherein the substrate comprises a substrate body and a barrier coat layer, the heat seal layer comprises a vapor deposition film and a polyolefin resin layer, the substrate body is a stretched resin film composed of a polyolefin, the polyolefin resin layer is composed of a polyolefin, a polyolefin constituting the substrate body and a polyolefin constituting the polyolefin resin layer are the same polyolefin, the thickness of the barrier coat layer is smaller than that of the substrate body and the thickness of the vapor deposition film is smaller than that of the polyolefin resin layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminate for packaging materials and a packaging material composed of the laminate.

  BACKGROUND ART Conventionally, a resin film made of a resin material has been used as a constituent material of a packaging material. For example, a resin film composed of polyolefin has a suitable flexibility and transparency and is excellent in heat sealability, and is therefore widely used as a packaging material.

  Normally, resin films composed of polyolefin are inferior in strength and heat resistance, so they cannot be used as a base material, and are used by laminating with resin films composed of polyester, polyamide, etc. In a normal package, a base material and a heat seal layer are formed of a laminated film made of a different resin material (for example, Patent Document 1).

  In recent years, with the increasing demand for building a recycling-based society, packaging materials having high recyclability have been demanded. However, the conventional package is made of a different kind of resin material as described above, and it is difficult to separate each resin material.

JP 2009-202519 A

The present inventors can use a polyolefin that has been conventionally used as a heat seal layer as a base material by forming a stretched resin film, and by using the base material laminated with the heat seal layer, It has been found that a recyclable packaging material can be obtained while maintaining the strength and heat resistance of the packaging material.
In addition, the present inventors have set the structure of the base material to include a barrier coat layer on one surface and the structure of the heat seal layer to include a vapor-deposited film on one surface, thereby enabling recycling. It was found that a packaging material having high barrier performance can be obtained while maintaining the property.

  The present invention has been made in view of the above findings, and an object of the present invention is to provide a packaging material capable of realizing a packaging material having strength and barrier properties as a packaging material and excellent recyclability. It is to provide a laminate.

  Another object of the present invention is to provide a packaging material composed of the packaging material laminate.

The laminate for packaging material of the present invention includes a base material and a heat seal layer,
The substrate includes a substrate body and a barrier coat layer,
The heat seal layer includes a vapor-deposited film and a polyolefin resin layer,
A base resin body is a stretched resin film composed of polyolefin,
The polyolefin constituting the base material body and the polyolefin constituting the polyolefin resin layer are the same polyolefin,
The thickness of the barrier coat layer is smaller than the thickness of the base body,
The thickness of the deposited film is smaller than the thickness of the polyolefin resin layer.

  In one embodiment of the present invention, the substrate includes a deposition film between the substrate body and the barrier coat layer.

  In one embodiment of the present invention, the packaging material laminate includes an adhesive layer between the base material and the heat seal layer.

In one embodiment of the present invention, the deposited film provided in the heat seal layer is an aluminum deposited film,
The adhesive layer contains a cured product of a resin composition containing a polyester polyol, an isocyanate compound, and a phosphoric acid-modified compound.

  In one embodiment of the present invention, the content of the polyolefin in the entire laminate for packaging materials is 80% by mass or more.

  The packaging material of the present invention is characterized by being composed of the above-mentioned laminate.

  ADVANTAGE OF THE INVENTION According to this invention, the laminated body for packaging materials which has high recyclability can be provided.

  Further, according to the present invention, a laminate for packaging materials having high strength, heat resistance, oxygen barrier properties and water vapor barrier properties can be provided.

  Further, according to the present invention, it is possible to provide a packaging material composed of the laminate for packaging material.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional schematic which shows one Embodiment of the laminated body for packaging materials of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional schematic which shows one Embodiment of the laminated body for packaging materials of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional schematic which shows one Embodiment of the laminated body for packaging materials of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional schematic which shows one Embodiment of the laminated body for packaging materials of this invention. It is a perspective view showing one Embodiment of the packaging material produced using the laminated body for packaging materials of this invention. It is a perspective view showing one Embodiment of the packaging material produced using the laminated body for packaging materials of this invention.

(Lamination for packaging materials)
As shown in FIG. 1, the packaging material laminate 10 of the present invention includes a base material 11 and a heat seal layer 12,
The base material 11 includes a base material body 13 and a barrier coat layer 14,
The heat seal layer 12 includes a vapor deposition film 15 and a polyolefin resin layer 16.

  Further, in one embodiment of the present invention, as shown in FIG. 2, the base material 11 can include a deposition film 17 between the base material body 13 and the barrier coat layer 14.

  Further, in one embodiment of the present invention, as shown in FIG. 3, the packaging material laminate 10 may include an adhesive layer 18 between the base material 11 and the heat seal layer 12.

  In one embodiment of the present invention, as shown in FIG. 4, the packaging material laminate 10 includes a polyolefin resin layer 16 including a first polyolefin resin layer 19 and a second polyolefin resin layer 20. Can be.

The content of the same polyolefin in the entire laminate for packaging materials of the present invention is preferably 80% by mass or more, and more preferably 90% by mass or more.
By setting the content of the same polyolefin in the entire laminate for packaging material of the present invention to 80% by mass or more, the recyclability of the laminate for packaging material of the present invention can be improved.
In addition, the content of the same polyolefin in the packaging material laminate means the ratio of the content of the same polyolefin to the sum of the content of the resin material in each layer constituting the laminate.

  Hereinafter, each layer constituting the laminate for packaging materials of the present invention will be described.

(Base material)
The substrate provided in the packaging material laminate of the present invention includes a substrate body and a barrier coat layer. Thereby, the oxygen barrier property and the water vapor barrier property of the laminate for packaging materials of the present invention can be remarkably improved.

In the present invention, the thickness of the barrier coat layer is smaller than the thickness of the substrate body. With such a configuration, the recyclability of the laminate for packaging materials of the present invention can be improved.
The thickness of the barrier coat layer is preferably smaller than the thickness of the base body by 5 μm or more, more preferably 10 μm or more. When the thickness of the barrier coat layer is smaller than the thickness of the substrate body by 5 μm or more, the recyclability of the laminate for packaging materials of the present invention can be further improved.

(Base material)
The base material body is composed of polyolefin, and the same polyolefin as the polyolefin constituting the polyolefin resin layer of the heat seal layer described later is used. By making the polyolefin constituting the base material body and the polyolefin resin constituting the polyolefin resin layer of the heat seal layer the same, the recyclability of the laminate for packaging materials can be improved.

  As the base material body, a stretched resin film made of polyolefin is used in order to impart sufficient strength and heat resistance as a packaging material. The stretched resin film may be a uniaxially stretched resin film or a biaxially stretched resin film.

The stretch ratio in the machine direction (MD) of the stretched resin film is preferably 2 times or more and 10 times or less, and more preferably 3 times or more and 7 times or less.
By setting the stretching ratio in the longitudinal direction (MD) of the stretched resin film to 2 times or more, the strength and heat resistance of the laminate for packaging materials of the present invention can be improved. Further, since the transparency of the base body can be improved, when an image is formed on the surface of the base body on the side of the barrier coat layer, the visibility can be improved.
On the other hand, the upper limit of the stretching ratio in the longitudinal direction (MD) of the stretched resin film is not particularly limited, but is preferably 10 times or less from the viewpoint of the breaking limit of the stretched resin film.

The stretching ratio in the transverse direction (TD) of the stretched resin film is preferably 2 times or more and 10 times or less, and more preferably 3 times or more and 7 times or less.
By setting the stretching ratio in the transverse direction (TD) of the stretched resin film to 2 times or more, the strength and heat resistance of the laminate for packaging materials of the present invention can be improved. Further, since the transparency of the base body can be improved, when an image is formed on the surface of the base body on the side of the barrier coat layer, the visibility can be improved.
On the other hand, the upper limit of the stretching ratio in the transverse direction (TD) of the stretched resin film is not particularly limited, but is preferably 10 times or less from the viewpoint of the breaking limit of the stretched resin film.

  The polyolefin constituting the base material body must be the same as the polyolefin resin constituting the heat seal layer as described above. Examples of such a polyolefin include polyethylene, polypropylene, polymethylpentene, and ethylene-propylene copolymer. And a propylene-butene copolymer. Of these, polyethylene and polypropylene are preferable.

As the polyethylene, high density polyethylene (HDPE) having a density of more than 0.945 g / cm ³ , medium density polyethylene (MDPE) having a density of 0.925 to 0.945 g / cm ³ , and a density of less than 0.925 g / cm ³ Low density polyethylene (LDPE) and linear low density polyethylene (LLDPE).

In one embodiment, a structure including a layer composed of high-density polyethylene (hereinafter, referred to as a high-density polyethylene layer) and a layer composed of medium-density polyethylene (hereinafter, referred to as a medium-density polyethylene layer) is provided as the base body. Can be used.
By providing the high-density polyethylene layer on the outside of the base material body, the strength and heat resistance of the laminate for packaging materials of the present invention can be improved. Further, by providing the medium density polyethylene layer, the stretchability of the resin film constituting the base material main body can be improved.

For example, it has a configuration of a high-density polyethylene layer / medium-density polyethylene layer from the outside.
With such a configuration, the stretchability of the resin film can be improved. Further, the strength and heat resistance of the laminate for packaging materials of the present invention can be improved.
At this time, the thickness of the high-density polyethylene layer is preferably smaller than the thickness of the medium-density polyethylene layer.
The ratio of the thickness of the high-density polyethylene layer to the thickness of the medium-density polyethylene layer is preferably from 1/10 to 1/1, more preferably from 1/5 to 1/2.
By setting the ratio of the thickness of the high-density polyethylene layer to the thickness of the medium-density polyethylene layer to 1/10 or more, the strength and heat resistance of the laminate for packaging materials of the present invention can be improved. Further, by setting the ratio of the thickness of the high-density polyethylene layer to the thickness of the medium-density polyethylene layer to 1/1 or less, the stretchability of the resin film can be improved.

In addition, for example, a configuration including a high-density polyethylene layer / a medium-density polyethylene layer / a high-density polyethylene layer from the outside may be employed.
With such a configuration, the stretchability of the resin film can be improved. Further, the strength and heat resistance of the laminate for packaging materials of the present invention can be improved. Further, it is possible to prevent the occurrence of curl in the base material body.
At this time, the thickness of the high-density polyethylene layer is preferably smaller than the thickness of the medium-density polyethylene layer.
The ratio of the thickness of the high-density polyethylene layer to the thickness of the medium-density polyethylene layer is preferably from 1/10 to 1/1, more preferably from 1/5 to 1/2.
By setting the ratio of the thickness of the high-density polyethylene layer to the thickness of the medium-density polyethylene layer to 1/10 or more, the strength and heat resistance of the laminate for packaging materials of the present invention can be improved. Further, by setting the ratio of the thickness of the high-density polyethylene layer to the thickness of the medium-density polyethylene layer to 1/1 or less, the stretchability of the resin film can be improved.

Further, for example, from the outside, a configuration of a high-density polyethylene layer / medium-density polyethylene layer / low-density polyethylene layer or a linear low-density polyethylene layer / medium-density polyethylene layer / high-density polyethylene layer may be employed.
With such a configuration, the stretchability of the resin film can be improved. Further, the strength and heat resistance of the laminate for packaging materials of the present invention can be improved. Further, it is possible to prevent the occurrence of curl in the base material body. Further, the processability of the resin film can be improved.
At this time, the thickness of the high-density polyethylene layer is preferably smaller than the thickness of the medium-density polyethylene layer.
The ratio of the thickness of the high-density polyethylene layer to the thickness of the medium-density polyethylene layer is preferably from 1/10 to 1/1, more preferably from 1/5 to 1/2.
By setting the ratio of the thickness of the high-density polyethylene layer to the thickness of the medium-density polyethylene layer to 1/10 or more, the strength and heat resistance of the laminate for packaging materials of the present invention can be improved. Further, by setting the ratio of the thickness of the high-density polyethylene layer to the thickness of the medium-density polyethylene layer to 1/1 or less, the stretchability of the resin film can be improved.
Further, the thickness of the high-density polyethylene layer is preferably smaller than the thickness of the low-density polyethylene layer or the linear low-density polyethylene layer.
The ratio of the thickness of the high-density polyethylene layer to the thickness of the low-density polyethylene layer or the linear low-density polyethylene layer is preferably 1/10 or more and 1/1 or less, and is 1/5 or more and 1/2 or less. More preferably, there is.
Heat resistance can be improved by setting the ratio of the thickness of the high-density polyethylene layer to the thickness of the low-density polyethylene layer or the linear low-density polyethylene layer to 1/10 or more. Further, by setting the ratio of the thickness of the high-density polyethylene layer to the thickness of the low-density polyethylene layer or the linear low-density polyethylene layer to 1/1 or less, the processability of the resin film can be improved.

The polypropylene may be any of a homopolymer, a random copolymer and a block copolymer.
The polypropylene homopolymer is a polymer of only propylene, and the polypropylene random copolymer is a copolymer of propylene and another α-olefin other than propylene (eg, ethylene, butene-1, 4-methyl-1-pentene, etc.). A random copolymer, a polypropylene block copolymer is a copolymer having a polymer block composed of propylene and a polymer block composed of an α-olefin other than the above-mentioned propylene.
Among these polypropylenes, from the viewpoint that the transparency of the base body can be improved, and in the case where an image is formed on the barrier coat layer side surface of the base body, the visibility can be improved from the viewpoint of a homopolymer. Alternatively, it is preferable to use a random copolymer. When importance is placed on the rigidity and heat resistance of the packaging material, a homopolymer can be used, and when importance is placed on impact resistance, a random copolymer can be used.

Further, as a raw material for obtaining a polyolefin, an olefin monomer derived from biomass may be used instead of an olefin monomer obtained from a fossil fuel. Since such an olefin monomer derived from biomass is a carb-neutral material, a packaging material with even less environmental load can be produced.
Such a biomass-derived polyolefin, for example, polyethylene, can be produced by a method as described in JP-A-2013-177531. A commercially available polyolefin derived from biomass (eg, green PE commercially available from Braskem) may be used.

  Further, a polyolefin recycled by mechanical recycling can also be used. Here, mechanical recycling generally means that the recovered polyolefin film or the like is crushed, washed with alkali to remove dirt and foreign matter on the film surface, and then dried under high temperature and reduced pressure for a certain time to remain inside the film. This is a method in which contaminants are diffused to perform decontamination, remove stains from the polyolefin film, and return to polyolefin again.

The substrate body may have an image formed on its surface. Although the image may be formed on any surface of the base material body, it is preferable to form an image on the barrier coat layer side surface because it can prevent contact with the outside air and prevent deterioration over time. .
The image to be formed is not particularly limited, and includes characters, patterns, symbols, combinations thereof, and the like.
The image can be formed using a conventionally known ink, but is preferably performed using a biomass-derived ink. Thereby, using the laminate of the present invention, a packaging material with less environmental load can be produced.
The method for forming an image is not particularly limited, and includes a conventionally known printing method such as a gravure printing method, an offset printing method, and a flexographic printing method. Among these, the flexographic printing method is preferable because the environmental load can be reduced.

Further, it is preferable that the base material body is subjected to a surface treatment. Thereby, the adhesiveness with an adjacent layer can be improved.
The surface treatment method is not particularly limited. For example, corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas and / or nitrogen gas, physical treatment such as glow discharge treatment, and oxidation using chemicals Chemical treatment such as treatment.
Further, an anchor coat layer may be formed on the surface of the base material body using a conventionally known anchor coat agent.

The thickness of the base material body is preferably 5 μm or more and 300 μm or less, more preferably 7 μm or more and 100 μm or less.
By setting the thickness of the base material body to 5 μm or more, the strength of the laminate for packaging materials of the present invention can be improved. Further, by setting the thickness of the base material body to 300 μm or less, the processability of the laminate for packaging materials of the present invention can be improved.

The base material body can be produced by forming a polyolefin film by a T-die method or an inflation method, producing a film, and then stretching the film.
According to the inflation method, film formation and stretching can be performed simultaneously.

When the substrate body is produced by the T-die method, the MFR of the polyolefin is preferably 5 g / 10 min or more and 20 g / 10 min or less.
By setting the MFR of the polyolefin to 5 g / 10 min or more, the processability of the laminate for packaging materials of the present invention can be improved. Further, by setting the MFR of the polyolefin to 20 g / 10 minutes or less, it is possible to prevent the resin film from breaking.

When the base body is produced by the inflation method, the MFR of the polyolefin is preferably 0.5 g / 10 min or more and 5 g / 10 min or less.
By setting the MFR of the polyolefin to 0.5 g / 10 minutes or more, the processability of the laminate for packaging materials of the present invention can be improved. Further, by setting the MFR of the polyolefin to 5 g / 10 minutes or less, the film forming property can be improved.

  In addition, the base material main body is not limited to the one produced by the above method, and a commercially available one may be used.

(Barrier coat layer)
The substrate is provided with a barrier coat layer, whereby the barrier properties of the packaging material laminate of the present invention, specifically, the oxygen barrier properties and the water vapor barrier properties can be improved.

  In one embodiment, the barrier coat layer comprises a polyamide, such as ethylene-vinyl alcohol copolymer (EVOH), polyvinyl alcohol, polyacrylonitrile, nylon 6, nylon 6,6, and polymethaxylylene adipamide (MXD6), polyester, It includes a polyurethane and a gas barrier resin such as a (meth) acrylic resin.

  The content of the gas barrier resin in the barrier coat layer is preferably from 50% by mass to 95% by mass, more preferably from 75% by mass to 90% by mass. By setting the content of the gas barrier resin in the barrier coat layer to 50% by mass or more, the oxygen barrier property and the water vapor barrier property of the packaging material laminate of the present invention can be further improved.

  The barrier coat layer may contain an additive as long as the properties of the present invention are not impaired. Examples of the additives include a cross-linking agent, an antioxidant, an anti-blocking agent, a slip agent, an ultraviolet absorber, a light stabilizer, a filler, a reinforcing agent, an antistatic agent, a compatibilizer, and a pigment. Can be

The thickness of the barrier coat layer is preferably from 0.01 μm to 10 μm, and more preferably from 0.1 μm to 5 μm.
By setting the thickness of the barrier coat layer to 0.01 μm or more, the oxygen barrier property and the water vapor barrier property of the laminate for a packaging material of the present invention can be further improved. By setting the thickness of the barrier coat layer to 10 μm or less, the recyclability of the laminate for packaging materials of the present invention can be improved.

  The barrier coat layer can be formed by dissolving or dispersing the above-mentioned material in water or a suitable solvent, and applying and drying the solution on a substrate body or a deposited film. The barrier coat layer can also be formed by applying a commercially available barrier coat agent on the polyolefin resin layer and drying.

In another embodiment, the barrier coat layer is a metal alkoxide obtained by polycondensing a mixture of a metal alkoxide and a water-soluble polymer by a sol-gel method in the presence of a sol-gel method catalyst, water and an organic solvent. Is a gas barrier coating film containing at least one resin composition such as a hydrolyzate of the above or a hydrolyzed condensate of a metal alkoxide.
When the packaging material laminate of the present invention includes a vapor-deposited film composed of an inorganic oxide between the substrate and the heat seal layer, the barrier coat layer in this form is provided so as to be adjacent to the vapor-deposited film. Accordingly, when a bending load is applied to the packaging material laminate by a molding machine or the like, a crack is generated in the deposited film, and it is possible to prevent the oxygen barrier property and the water vapor barrier property from being reduced.

In one embodiment, the metal alkoxide is represented by the following general formula.
R ¹ _n M (OR ² ) _m
(Wherein, R ¹ and R ² each represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, and m represents an integer of 1 or more. , N + m represents the valence of M.)

As the metal atom M, for example, silicon, zirconium, titanium, aluminum and the like can be used.
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.

Examples of the metal alkoxide satisfying the above general formula include tetramethoxysilane (Si (OCH ₃ ) ₄ ), tetraethoxysilane (% by mass) Si (OC ₂ H ₅ ) ₄ ), and tetrapropoxysilane (Si (OC ₃ H) ₇ ) ₄ ) and tetrabutoxysilane (Si (OC ₄ H ₉ ) ₄ ).

Further, it is preferable to use a silane coupling agent together with the metal alkoxide.
As the silane coupling agent, a known organoalkoxysilane containing an organic reactive group can be used, and an organoalkoxysilane having an epoxy group is particularly preferable. Examples of the organoalkoxysilane having an epoxy group include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, and β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane. Can be

  Two or more silane coupling agents as described above may be used, and the silane coupling agent is used in an amount of about 1 to 20 parts by mass with respect to 100 parts by mass of the total amount of the alkoxide. Is preferred.

  As the water-soluble polymer, polyvinyl alcohol and ethylene-vinyl alcohol copolymer are preferable, and from the viewpoint of oxygen barrier properties, water vapor barrier properties, water resistance and weather resistance, it is preferable to use them in combination.

The content of the water-soluble polymer in the gas barrier coating film is preferably 5 parts by mass or more and 500 parts by mass or less based on 100 parts by mass of the metal alkoxide.
By setting the content of the water-soluble polymer in the gas barrier coating film to 5 parts by mass or more based on 100 parts by mass of the metal alkoxide, the oxygen barrier property and the water vapor barrier property of the laminate for packaging materials of the present invention are further improved. can do. Further, by setting the content of the water-soluble polymer in the gas barrier coating film to 500 parts by mass or less based on 100 parts by mass of the metal alkoxide, the film forming property of the gas barrier coating film can be improved.

The thickness of the gas barrier coating film is preferably from 0.01 μm to 100 μm, more preferably from 0.1 μm to 50 μm.
When the thickness of the gas barrier coating film is 0.01 μm or more, the oxygen barrier property and the water vapor barrier property of the packaging material laminate of the present invention can be improved. In addition, by providing the film adjacent to the vapor-deposited film composed of an inorganic oxide, a crack is generated in the vapor-deposited film when a bending load is applied to the packaging material laminate by a molding machine or the like, and the oxygen barrier property and the water vapor barrier It is possible to prevent the property from being lowered.
By setting the thickness of the gas barrier coating film to 100 μm or less, the recyclability of the packaging material laminate of the present invention can be improved.

The gas barrier coating film is formed by coating the composition containing the above-mentioned material with a substrate body or vapor-deposited by a conventionally known means such as roll coating such as a gravure roll coater, spray coating, spin coating, dipping, brushing, bar code, and applicator. It can be formed by coating on a film and polycondensing the composition by a sol-gel method.
As the sol-gel method catalyst, an acid or amine compound is preferable. As the amine-based compound, a tertiary amine which is substantially insoluble in water and soluble in an organic solvent is preferable, for example, N, N-dimethylbenzylamine, tripropylamine, tributylamine, tripentyl. Amines and the like. Among these, N, N-dimethylbenzylamine is preferred.
The sol-gel method catalyst is preferably used in a range of 0.01 to 1.0 part by mass, and preferably in a range of 0.03 to 0.3 part by mass, per 100 parts by mass of the metal alkoxide. Is more preferable.
By setting the amount of the sol-gel method catalyst to 0.01 parts by mass or more per 100 parts by mass of the metal alkoxide, the catalytic effect can be improved. Further, by setting the amount of the sol-gel method catalyst to 1.0 parts by mass or less per 100 parts by mass of the metal alkoxide, the thickness of the formed gas barrier coating film can be made uniform.

The composition may further include an acid. The acid is used as a catalyst for the sol-gel method, mainly as a catalyst for hydrolysis of an alkoxide or a silane coupling agent.
As the acid, mineral acids such as sulfuric acid, hydrochloric acid and nitric acid, and organic acids such as acetic acid and tartaric acid are used. The amount of the acid to be used is preferably 0.001 mol or more and 0.05 mol or less with respect to the total mol amount of the alkoxide portion (for example, silicate portion) of the alkoxide and the silane coupling agent.
The catalytic effect can be improved by setting the amount of the acid to be 0.001 mol or more with respect to the total molar amount of the alkoxide component (for example, the silicate portion) of the alkoxide and the silane coupling agent. In addition, the thickness of the gas barrier coating film to be formed can be made uniform by controlling the amount of the alkoxide and the silane coupling agent to be 0.05 mol or less based on the total molar amount of the alkoxide component (for example, the silicate portion). it can.

Further, the composition may contain water in a ratio of preferably 0.1 mol or more and 100 mol or less, more preferably 0.8 mol or more and 2 mol or less, based on 1 mol of the total molar amount of the alkoxide. preferable.
By setting the content of water to 0.1 mol or more based on 1 mol of the total molar amount of the alkoxide, the oxygen barrier property and the water vapor barrier property of the laminate for packaging materials of the present invention can be improved. Further, by setting the content of water to 100 mol or more based on 1 mol of the total molar amount of the alkoxide, the hydrolysis reaction can be promptly performed.

  Further, the composition may contain an organic solvent. As the organic solvent, for example, methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butanol and the like can be used.

Hereinafter, an embodiment of a method of forming a gas barrier coating film will be described below.
First, a composition is prepared by mixing a metal alkoxide, a water-soluble polymer, a sol-gel catalyst, water, an organic solvent, and if necessary, a silane coupling agent. The polycondensation reaction proceeds gradually in the composition.
Next, the composition is applied and dried on the polyolefin resin layer by the above-mentioned conventionally known method. By this drying, the polycondensation reaction of the alkoxide and the water-soluble polymer (when the composition contains a silane coupling agent, also the silane coupling agent) further proceeds, and a composite polymer layer is formed.
Finally, the composition is heated at a temperature of 20 to 250 ° C., preferably 50 to 220 ° C. for 1 second to 10 minutes to form a gas barrier coating film.

  The barrier coat layer may have an image formed on its surface. The image forming method and the like are as described above.

(Evaporated film)
The substrate can be provided with a deposited film between the substrate body and the barrier coat layer. Thereby, the oxygen barrier property and the water vapor barrier property of the laminate for packaging materials of the present invention can be improved.

Examples of the deposited film include a metal such as aluminum, and an inorganic oxide such as aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, zirconium oxide, titanium oxide, boron oxide, hafnium oxide, and barium oxide. Can be mentioned.
When an image is formed on the surface of the barrier coat layer described below, the deposited film is required to be transparent. In this case, the deposited film is preferably an inorganic oxide deposited film.

The thickness of the deposited film is preferably from 1 nm to 150 nm, more preferably from 5 nm to 60 nm, even more preferably from 10 nm to 40 nm.
By setting the thickness of the deposited film to 1 nm or more, the oxygen barrier property and the water vapor barrier property of the packaging material laminate of the present invention can be further improved. Further, by setting the thickness of the deposited film to 150 nm or less, generation of cracks in the deposited film can be prevented, and the recyclability of the packaging material laminate of the present invention can be improved.

  In order for the deposited film to be an aluminum deposited film, the OD value is preferably 2 or more and 3.5 or less. Thereby, the oxygen barrier property and the water vapor barrier property can be improved while maintaining the productivity of the packaging material laminate of the present invention. In the present invention, the OD value can be measured according to JIS-K-7361.

  The deposited film can be formed by a conventionally known method. For example, a physical vapor deposition method (Physical Vapor Deposition method, PVD method) such as a vacuum deposition method, a sputtering method and an ion plating method, and plasma chemistry Chemical vapor deposition methods (Chemical Vapor Deposition method, CVD method) such as a vapor phase growth method, a thermal chemical vapor deposition method, and a photochemical vapor deposition method can be given.

Further, for example, a composite film composed of two or more layers of vapor deposited films of different kinds of inorganic oxides can be formed and used by using both physical vapor deposition and chemical vapor deposition. The degree of vacuum of the deposition chamber is preferably about 10 ⁻² to 10 ⁻⁸ mbar before oxygen introduction, and about 10 ⁻¹ to 10 ⁻⁶ mbar after oxygen introduction. Note that the amount of oxygen introduced differs depending on the size of the vapor deposition machine. As the oxygen to be introduced, an inert gas such as an argon gas, a helium gas, or a nitrogen gas may be used as a carrier gas within a range that does not cause any trouble. The transport speed of the film can be about 10 to 800 m / min.

  The surface of the deposited film is preferably subjected to the above surface treatment. Thereby, the adhesiveness with an adjacent layer can be improved.

(Heat seal layer)
The heat seal layer includes a deposited film and a polyolefin resin layer. With the heat seal layer having such a configuration, the oxygen barrier property and the water vapor barrier property of the laminate for a packaging material of the present invention can be improved.

The present invention is characterized in that the thickness of the deposited film is smaller than the thickness of the polyolefin resin layer. With such a configuration, the recyclability of the laminate for packaging materials of the present invention can be improved.
The thickness of the deposited film is preferably smaller than the thickness of the polyolefin resin layer by 5 μm or more, and more preferably smaller by 10 μm or more. When the thickness of the vapor-deposited film is smaller than the thickness of the polyolefin resin layer by 5 μm or more, the recyclability of the laminate for packaging materials of the present invention can be further improved.

(Evaporated film)
Examples of the deposited film include a metal such as aluminum, and an inorganic oxide such as aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, zirconium oxide, titanium oxide, boron oxide, hafnium oxide, and barium oxide. Can be mentioned.

The thickness of the deposited film is preferably from 1 nm to 150 nm, more preferably from 5 nm to 60 nm, even more preferably from 10 nm to 40 nm.
By setting the thickness of the deposited film to 1 nm or more, the oxygen barrier property and the water vapor barrier property of the packaging material laminate of the present invention can be further improved. Further, by setting the thickness of the deposited film to 150 nm or less, generation of cracks in the deposited film can be prevented, and the recyclability of the packaging material laminate of the present invention can be improved.

  In order for the deposited film to be an aluminum deposited film, the OD value is preferably 2 or more and 3.5 or less. Thereby, the oxygen barrier property and the water vapor barrier property can be improved while maintaining the productivity of the packaging material laminate of the present invention.

  The deposition film can be formed by the above method.

  The surface of the deposited film is preferably subjected to the above surface treatment. Thereby, the adhesiveness with an adjacent layer can be improved.

(Polyolefin resin layer)
The polyolefin resin layer is characterized by being composed of the same polyolefin as the above-mentioned polyolefin constituting the substrate main body. With such a configuration, a recyclable packaging material can be obtained while maintaining the strength and heat resistance of the packaging material.
However, the polyolefin resin layer is formed by an unstretched polyolefin resin film or by melt extrusion of polyolefin.

  When polypropylene is used as the polyolefin resin layer, a heat seal modifier may be included to improve heat sealability. The heat seal modifier is not particularly limited as long as it has excellent compatibility with the polyolefin constituting the polyolefin resin layer, and examples thereof include an olefin copolymer.

The thickness of the polyolefin resin layer is preferably 5 μm or more and 100 μm or less, more preferably 10 μm or more and 50 μm or less.
By setting the thickness of the polyolefin resin layer to 5 μm or more, heat sealability and recyclability can be improved. Further, by setting the thickness of the polyolefin resin layer to 100 μm or less, the processability of the laminate for packaging materials of the present invention can be improved.

  In one embodiment, the polyolefin resin layer may have a multilayer structure. In particular, when a heat seal modifier is added to polypropylene as a polyolefin resin layer, the modifier may migrate (leaches) to the gas barrier resin layer side. The heat-sealed side (the innermost layer side of the laminate) may be a layer containing a polyolefin resin and a heat-seal modifier, and the outer layer may be a layer made of polypropylene. That is, examples of the multilayer structure include a multilayer structure including a first polyolefin resin layer composed of a polyolefin and a second polyolefin resin layer composed of a polyolefin and a heat seal modifier.

The content of the heat seal modifier in the second polyolefin resin layer is preferably from 10% by mass to 50% by mass, and more preferably from 20% by mass to 40% by mass.
By setting the content of the heat seal modifier in the second polyolefin resin layer to 10% by mass or more, the heat seal property of the second polyolefin resin layer can be improved. Further, by setting the content of the heat seal modifier in the second polyolefin resin layer to 50% by mass or less, the recyclability of the laminate for packaging materials of the present invention can be improved.

When the polyolefin resin layer has the two-layer structure, the thickness of the first polyolefin resin layer is preferably 5 μm or more and 50 μm or less, and more preferably 7 μm or more and 45 μm or less.
By setting the thickness of the first polyolefin resin layer to 5 μm or more, the recyclability of the packaging material laminate of the present invention and the heat sealing property of the first polyolefin resin layer can be improved. Further, by setting the thickness of the first polyolefin resin layer to 50 μm or less, the workability of the laminate for packaging materials of the present invention can be improved.
Further, the thickness of the second polyolefin resin layer is preferably 5 μm or more and 20 μm or less, and more preferably 7 μm or more and 15 μm or less.
By setting the thickness of the second polyolefin resin layer to 5 μm or more, the heat sealing property of the second polyolefin resin layer can be improved. In addition, by setting the thickness of the second polyolefin resin layer to 20 μm or less, both the recyclability and the processability of the laminate for packaging materials of the present invention can be achieved.

(Adhesive layer)
The laminate for packaging materials of the present invention can include an adhesive layer between the substrate and the heat seal layer. Thereby, the adhesion between the barrier coat layer of the base material and the deposited film of the heat seal layer can be improved.

The adhesive layer contains at least one type of adhesive, and may be any of a one-component curable type, a two-component curable type, and a non-curable type. The adhesive may be a solventless adhesive or a solvent adhesive, but from the viewpoint of environmental load, a solventless adhesive can be preferably used.
Examples of the non-solvent type adhesive include a polyether-based adhesive, a polyester-based adhesive, a silicone-based adhesive, an epoxy-based adhesive, and a urethane-based adhesive. A system adhesive can be preferably used.
Examples of the solvent-based adhesive include a rubber-based adhesive, a vinyl-based adhesive, a silicone-based adhesive, an epoxy-based adhesive, a phenol-based adhesive, and an olefin-based adhesive.

Further, when the vapor-deposited film of the heat-sealing layer is an aluminum-deposited film, the adhesive layer is preferably formed of a cured product of a resin composition containing a polyester polyol, an isocyanate compound, and a phosphoric acid-modified compound.
When the adhesive layer has such a structure, the oxygen barrier property and the water vapor barrier property of the laminate for a packaging material of the present invention can be further improved.
Further, when a laminate for a packaging material provided with a vapor-deposited film is applied to a packaging material, a bending load is applied to the laminate by a molding machine or the like, so that a crack or the like may be generated in the aluminum vapor-deposited film. By using the specific adhesive as described above, it is possible to suppress a decrease in the oxygen barrier property and the water vapor barrier property even when a crack occurs in the aluminum deposited film.

  The polyester polyol has two or more hydroxyl groups in one molecule as a functional group. Further, the isocyanate compound has two or more isocyanate groups in one molecule as a functional group. The polyester polyol has, for example, a polyester structure or a polyester polyurethane structure as a main skeleton.

  As a specific example of a resin composition (adhesive) containing a polyester polyol, an isocyanate compound, and a phosphoric acid-modified compound, a series of PASLIMs sold by DIC Corporation can be used.

  The resin composition may further include a plate-like inorganic compound, a coupling agent, cyclodextrin and / or a derivative thereof, and the like.

As the polyester polyol having two or more hydroxyl groups in one molecule as a functional group, for example, the following [First Example] to [Third Example] can be used.
[Example 1] Polyester polyol obtained by polycondensation of ortho-oriented polycarboxylic acid or anhydride thereof and polyhydric alcohol [Example 2] Polyester polyol having glycerol skeleton [Example 3] Having isocyanuric ring Polyester polyol Hereinafter, each polyester polyol will be described.

The polyester polyol according to the first example is selected from the group consisting of a polycarboxylic acid component containing at least one or more of orthophthalic acid and its anhydride, and ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, and cyclohexane dimethanol. A polycondensate obtained by polycondensation with a polyhydric alcohol component containing at least one of the above.
Particularly, a polyester polyol in which the content of orthophthalic acid and its anhydride relative to all components of the polycarboxylic acid is 70 to 100% by mass is preferable.

The polyester polyol according to the first example essentially requires orthophthalic acid and its anhydride as the polyvalent carboxylic acid component, but copolymerizes other polyvalent carboxylic acid components within a range that does not impair the effects of the present embodiment. You may.
Specifically, aliphatic polycarboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid and dodecanedicarboxylic acid, maleic anhydride, polycarboxylic acids containing unsaturated bonds such as maleic acid and fumaric acid, 1, Alicyclic polycarboxylic acids such as 3-cyclopentanedicarboxylic acid and 1,4-cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic 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, anhydrides of these dicarboxylic acids and ester formation of these dicarboxylic acids Aromatic polycarboxylic acids such as a carboxylic acid derivative, p-hydroxybenzoic acid, p- ( And polybasic acids such as 2-hydroxyethoxy) benzoic acid and ester-forming derivatives of these dihydroxycarboxylic acids. Among these, succinic acid, 1,3-cyclopentanedicarboxylic acid, and isophthalic acid are preferred.
In addition, you may use 2 or more types of said other polyvalent carboxylic acids.

一般式（１）において、Ｒ_１、Ｒ_２、Ｒ_３は、各々独立に、Ｈ（水素原子）または下記の一般式（２）で表される基である。

As the polyester polyol according to the second example, a polyester polyol having a glycerol skeleton represented by the general formula (1) can be given.

In the general formula (1), R ₁ , R ₂ , and R ₃ are each independently H (hydrogen atom) or a group represented by the following general formula (2).

In the formula (2), n represents an integer of 1 to 5, and X represents an optionally substituted 1,2-phenylene group, 1,2-naphthylene group, 2,3-naphthylene group, Represents an arylene group selected from the group consisting of a 3-anthraquinonediyl group and a 2,3-anthracenediyl group, and Y represents an alkylene group having 2 to 6 carbon atoms.
However, at least one of R ₁ , R ₂ and R ₃ represents a group represented by the general formula (2).

In the general formula (1), at least one of R ₁ , R ₂ and R ₃ needs to be a group represented by the general formula (2). Among them, it is preferable that all of R ₁ , R ₂ and R ₃ are groups represented by the general formula (2).

_Also, tables in the compound R _1, R 2, one of _{R 3} is a group represented by the general formula _(2), R _1, R 2, either _{R 3} 2 two generally formula (2) A mixture of any two or more of the compound represented by the general formula (2) and the compound represented by the general formula (2) wherein all of R ₁ , R ₂ and R ₃ may be a mixture.

X is selected from the group consisting of a 1,2-phenylene group, a 1,2-naphthylene group, a 2,3-naphthylene group, a 2,3-anthraquinonediyl group and a 2,3-anthracenediyl group, and has a substituent. Represents an optionally substituted arylene group.
When X is substituted by a substituent, it may be substituted with one or more substituents, which is attached to any carbon atom on X different from the free radical. As the substituent, chloro, bromo, methyl, ethyl, i-propyl, hydroxyl, methoxy, ethoxy, phenoxy, methylthio, phenylthio, cyano, nitro, amino, Examples include a phthalimide group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group and a naphthyl group.

  In the general formula (2), Y represents ethylene group, propylene group, butylene group, neopentylene group, 1,5-pentylene group, 3-methyl-1,5-pentylene group, 1,6-hexylene group, methylpentylene. And an alkylene group having 2 to 6 carbon atoms such as a dimethylbutylene group. Y is preferably a propylene group or an ethylene group, and most preferably an ethylene group.

  The polyester resin compound having a glycerol skeleton represented by the general formula (1) is an essential component comprising glycerol, an aromatic polycarboxylic acid or an anhydride thereof in which a carboxylic acid is substituted at an ortho position, and a polyhydric alcohol component. And can be synthesized by reacting

Examples of the aromatic polycarboxylic acid or an anhydride thereof in which a carboxylic acid is substituted at an ortho position include orthophthalic acid or an anhydride thereof, naphthalene 2,3-dicarboxylic acid or an anhydride thereof, naphthalene 1,2-dicarboxylic acid or an anhydride thereof. Anhydrides, anthraquinone 2,3-dicarboxylic acids or anhydrides thereof, and 2,3-anthracene carboxylic acids or anhydrides thereof are exemplified.
These compounds may have a substituent at any carbon atom of the aromatic ring. As the substituent, chloro, bromo, methyl, ethyl, i-propyl, hydroxyl, methoxy, ethoxy, phenoxy, methylthio, phenylthio, cyano, nitro, amino, Examples include a phthalimide group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group and a naphthyl group.

  Examples of the polyhydric alcohol component include alkylene diols having 2 to 6 carbon atoms. For example, diols such as ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol and dimethylbutanediol Can be exemplified.

一般式（３）において、Ｒ_１、Ｒ_２、Ｒ_３は、各々独立に、「−（ＣＨ_２）ｎ１−ＯＨ（但しｎ１は２〜４の整数を表す）」、または、一般式（４）の構造を表す。

The polyester polyol according to the third example is a polyester polyol having an isocyanuric ring represented by the following general formula (3).

In the general formula (3), R ₁ , R ₂ , and R ₃ each independently represent “— (CH ₂ ) n 1-OH (where n 1 represents an integer of 2 to 4)” or the general formula (4 ).

In the general formula (4), n2 represents an integer of 2 to 4, n3 represents an integer of 1 to 5, X represents a 1,2-phenylene group, 1,2-naphthylene group, 2,3-naphthylene group, Selected from the group consisting of a 2,3-anthraquinonediyl group and a 2,3-anthracenediyl group, which represents an arylene group which may have a substituent, and Y represents an alkylene group having 2 to 6 carbon atoms. Represents a group represented by However, at least one of R ₁ , R ₂ and R ₃ is a group represented by the general formula (4).

In the general formula (3), - (CH 2 ) alkylene group represented by _n1- may be branched be linear. n1 is preferably 2 or 3, and most preferably 2.

In the general formula (4), n2 represents an integer of 2 to 4, and n3 represents an integer of 1 to 5.
X is selected from the group consisting of a 1,2-phenylene group, a 1,2-naphthylene group, a 2,3-naphthylene group, a 2,3-anthraquinonediyl group, and a 2,3-anthracenediyl group, and has a substituent. Represents an optionally substituted arylene group.

When X is substituted by a substituent, it may be substituted with one or more substituents, which is attached to any carbon atom on X different from the free radical. As the substituent, chloro, bromo, methyl, ethyl, i-propyl, hydroxyl, methoxy, ethoxy, phenoxy, methylthio, phenylthio, cyano, nitro, amino, Examples include a phthalimide group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group and a naphthyl group.
X is preferably a hydroxyl group, a cyano group, a nitro group, an amino group, a phthalimide group, a carbamoyl group, an N-ethylcarbamoyl group and a phenyl group, among which a hydroxyl group, a phenoxy group, a cyano group, a nitro group, a phthalimide group and A phenyl group is most preferred.

  In the general formula (4), Y represents an ethylene group, a propylene group, a butylene group, a neopentylene group, a 1,5-pentylene group, a 3-methyl-1,5-pentylene group, a 1,6-hexylene group, a methylpentylene group. And an alkylene group having 2 to 6 carbon atoms such as a dimethylbutylene group. Y is preferably a propylene group or an ethylene group, and most preferably an ethylene group.

In the general formula (3), at least one of R ₁ , R ₂ and R ₃ is a group represented by the general formula (4). Among them, it is preferable that all of R ₁ , R ₂ and R ₃ are groups represented by the general formula (4).

_Also, tables in the compound R _1, R 2, one of _{R 3} is a group represented by the general formula _(4), R _1, R 2, either _{R 3} 2 two generally formula (4) A mixture of any two or more of the compounds represented by the general formula (4) and the compounds represented by the general formula (4) in which all of R ₁ , R ₂ and R ₃ may be a mixture.

  The polyester polyol having an isocyanuric ring represented by the general formula (3) includes a triol having an isocyanuric ring, an aromatic polycarboxylic acid or an anhydride thereof in which a carboxylic acid is substituted at an ortho position, and a polyhydric alcohol component. Can be synthesized by reacting

  Examples of the triol having an isocyanuric ring include alkylene oxide adducts of isocyanuric acid such as 1,3,5-tris (2-hydroxyethyl) isocyanuric acid and 1,3,5-tris (2-hydroxypropyl) isocyanuric acid And the like.

  Examples of the aromatic polycarboxylic acid in which the carboxylic acid is substituted at the ortho position or an anhydride thereof include orthophthalic acid or an anhydride thereof, naphthalene 2,3-dicarboxylic acid or an anhydride thereof, and naphthalene 1,2-dicarboxylic acid. Or an anhydride thereof, anthraquinone 2,3-dicarboxylic acid or anhydride thereof, and 2,3-anthracene carboxylic acid or anhydride thereof. These compounds may have a substituent at any carbon atom of the aromatic ring.

  Examples of the substituent include chloro, bromo, methyl, ethyl, i-propyl, hydroxyl, methoxy, ethoxy, phenoxy, methylthio, phenylthio, cyano, nitro, amino, Examples include a phthalimide group, a carboxyl group, a carbamoyl group, an N-ethylcarbamoyl group, a phenyl group and a naphthyl group.

Examples of the polyhydric alcohol component include alkylene diols having 2 to 6 carbon atoms. For example, diols such as ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol and dimethylbutanediol Is mentioned.
Among them, 1,3,5-tris (2-hydroxyethyl) isocyanuric acid or 1,3,5-tris (2-hydroxypropyl) isocyanuric acid is used as the triol compound having an isocyanuric ring, and the carboxylic acid is in the ortho position. Orthophthalic anhydride is used as the aromatic polycarboxylic acid or its anhydride substituted with, and a polyester polyol compound having an isocyanuric ring using ethylene glycol as the polyhydric alcohol is particularly excellent in oxygen barrier properties and adhesiveness. preferable.

  The isocyanuric ring is highly polar and trifunctional, can increase the polarity of the entire system, and can increase the crosslink density. From such a viewpoint, it is preferable to contain the isocyanuric ring in an amount of 5% by mass or more based on the total solid content of the adhesive resin.

The isocyanate compound has two or more isocyanate groups in the molecule.
The isocyanate compound may be aromatic or aliphatic, and may be a low molecular compound or a high molecular compound.
Further, the isocyanate compound may be a blocked isocyanate compound obtained by an addition reaction using a known isocyanate blocking agent by a known and appropriate method.
Above all, a polyisocyanate compound having three or more isocyanate groups is preferable from the viewpoint of adhesion and retort resistance, and aromatic is preferable from the viewpoint of oxygen barrier properties and water vapor barrier properties.

Specific examples of the isocyanate compound include, for example, tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, metaxylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, and these isocyanate compounds. And adducts, burettes and allophanates obtained by reacting these isocyanate compounds with low molecular weight active hydrogen compounds or their alkylene oxide adducts or high molecular weight active hydrogen compounds.
Examples of the low-molecular active hydrogen compound include ethylene glycol, propylene glycol, metaxylylene alcohol, 1,3-bishydroxyethylbenzene, 1,4-bishydroxyethylbenzene, trimethylolpropane, glycerol, pentaerythritol, erythritol, sorbitol, Examples include ethylenediamine, monoethanolamine, diethanolamine, triethanolamine, and meta-xylylenediamine. Examples of the molecularly active hydrogen compound include various polyester resins, polyether polyols, and high molecular weight active hydrogen compounds of polyamide.

一般式（５）において、Ｒ_１、Ｒ_２、Ｒ_３は、水素原子、炭素数１〜３０のアルキル基、（メタ）アクリロイル基、置換基を有してもよいフェニル基および（メタ）アクリロイルオキシ基を有する炭素数１〜４のアルキル基から選ばれる基であるが、少なくとも一つは水素原子であり、ｎは、１〜４の整数を表す。

式中、Ｒ_４、Ｒ_５は、水素原子、炭素数１〜３０のアルキル基、（メタ）アクリロイル基、置換基を有してもよいフェニル基および（メタ）アクリロイルオキシ基を有する炭素数１〜４のアルキル基から選ばれる基であり、ｎは１〜４の整数、ｘは０〜３０の整数、ｙは０〜３０の整数を表すが、ｘとｙが共に０である場合を除く。 The phosphoric acid-modified compound is, for example, a compound represented by the following general formula (5) or (6).

In the general formula (5), R ₁ , R ₂ , and R ₃ represent a hydrogen atom, an alkyl group having 1 to 30 carbon atoms, a (meth) acryloyl group, a phenyl group which may have a substituent, and (meth) acryloyl. It is a group selected from an alkyl group having 1 to 4 carbon atoms having an oxy group, at least one of which is a hydrogen atom, and n represents an integer of 1 to 4.

In the formula, R ₄ and R ₅ represent a hydrogen atom, an alkyl group having 1 to 30 carbon atoms, a (meth) acryloyl group, a phenyl group which may have a substituent, and a carbon atom having 1 atom having a (meth) acryloyloxy group. And n is an integer of 1 to 4, x is an integer of 0 to 30, and y is an integer of 0 to 30 except when x and y are both 0. .

  More 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, butoxy Examples thereof include ethyl acid phosphate, oleyl acid phosphate, tetracosyl acid phosphate, 2-hydroxyethyl methacrylate acid phosphate, and polyoxyethylene alkyl ether phosphoric acid, and one or more of these can be used.

The content of the phosphoric acid-modified compound in the resin composition is preferably from 0.005% by mass to 10% by mass, and more preferably from 0.01% by mass to 1% by mass.
When the content of the phosphoric acid-modified compound is 0.005% by mass or more, the oxygen barrier property and the water vapor barrier property of the laminate for a packaging material of the present invention can be improved. Further, by setting the content of the phosphoric acid-modified compound to 10% by mass or less, the adhesiveness of the adhesive layer can be improved.

The resin composition containing the polyester polyol, the isocyanate compound and the phosphoric acid-modified compound may contain a plate-like inorganic compound, whereby the adhesiveness of the adhesive layer can be improved. Moreover, the bending load resistance of the laminate for packaging materials of the present invention can be improved.
Examples of the plate-like inorganic compound include kaolinite-serpentine group clay minerals (halloysite, kaolinite, enderite, dickite, nacrite, antigolite, chrysotile, etc.) and pyrophyllite-talc family (pyrophyllite, talc, Kerolai, etc.).

Examples of the coupling agent include a silane coupling agent, a titanium coupling agent, and an aluminum coupling agent represented by the following general formula (7). In addition, these coupling agents may be used alone or in combination of two or more.

  Examples of the silane coupling agent include vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ -Glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-methacryloxytrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxy Propylmethyldiethoxysilane, γ-methacryloxypropyltriethoxysilane, N-β (aminoethyl) γ-aminopropylmethyldimethoxysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, N-β (Aminoethyl) γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ- Examples include mercaptopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, and 3-triethoxysilyl-N- (1,3-dimethyl-butylidene).

  Examples of the titanium-based coupling agent include isopropyl triisostearoyl titanate, isopropyl tri (N-aminoethyl-aminoethyl) titanate, isopropyl tridodecylbenzenesulfonyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, and tetraoctyl bis. (Didodecyl phosphite) titanate, tetraoctyl bis (ditridecyl phosphite) titanate, bis (dioctyl pyrophosphate) oxyacetate titanate, bis (dioctyl pyrophosphate) ethylene titanate, isopropyl trioctaino nortitanate, isopropyl dimethacryl isostearyl titanate , Isopropylisostearoyldiacryl titanate, diisostearoylethyl Nchitaneto, isopropyl tri (dioctyl phosphate) titanate, isopropyl tricumylphenyl titanate and dicumyl phenyloxy acetate titanate.

  Specific examples of the aluminum-based coupling agent include, for example, acetoalkoxyaluminum diisopropylate, diisopropoxyaluminum ethyl acetoacetate, diisopropoxyaluminum monomethacrylate, isopropoxyaluminum alkyl acetoacetate mono (dioctyl phosphate), aluminum -2-ethylhexanoate oxide trimer, aluminum stearate oxide trimer and alkyl acetoacetate aluminum oxide trimer.

The resin composition can include cyclodextrin and / or a derivative thereof, whereby the adhesiveness of the adhesive layer can be improved. Moreover, the bending load resistance of the laminate for packaging materials of the present invention can be further improved.
Specifically, for example, a cyclodextrin such as cyclodextrin, alkylated cyclodextrin, acetylated cyclodextrin, and hydroxyalkylated cyclodextrin in which a hydrogen atom of a hydroxyl group of a glucose unit of a glucose unit is substituted with another functional group is used. Can be. Also, a branched cyclic dextrin can be used.
The cyclodextrin skeleton in cyclodextrin and the cyclodextrin derivative is composed of α-cyclodextrin consisting of six glucose units, β-cyclodextrin consisting of seven glucose units, and γ-cyclodextrin consisting of eight glucose units. Any of them may be used.
These compounds may be used alone or in combination of two or more. In addition, these cyclodextrins and / or derivatives thereof may be hereinafter collectively referred to as dextrin compounds.

  From the viewpoint of compatibility and dispersibility in the resin composition, it is preferable to use a cyclodextrin derivative as the cyclodextrin compound.

  Examples of the alkylated cyclodextrin include methyl-α-cyclodextrin, methyl-β-cyclodextrin, methyl-γ-cyclodextrin, and the like. These compounds may be used alone or in combination of two or more.

  As the acetylated cyclodextrin, for example, monoacetyl-α-cyclodextrin, monoacetyl-β-cyclodextrin, monoacetyl-γ-cyclodextrin and the like can be mentioned. These compounds may be used alone or in combination of two or more.

  Examples of the hydroxyalkylated cyclodextrin include hydroxypropyl-α-cyclodextrin, hydroxypropyl-β-cyclodextrin, and hydroxypropyl-γ-cyclodextrin. These compounds may be used alone or in combination of two or more.

The thickness of the adhesive layer is preferably 0.5 μm or more and 6 μm or less, more preferably 0.8 μm or more and 5 μm or less, and even more preferably 1 μm or more and 4.5 μm or less.
By setting the thickness of the adhesive layer to 0.5 μm or more, the adhesiveness of the adhesive layer can be improved. When a cured product of a resin composition containing a polyester polyol, an isocyanate compound, and a phosphoric acid-modified compound is used, the bending load resistance of the laminate for a packaging material can be improved.
By setting the thickness of the adhesive layer to 6 μm or less, the processability of the laminate for packaging materials can be improved.

  The adhesive layer may be applied and dried on a substrate or the like by a conventionally known method such as a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, a reverse roll coating method, a Fonten method, and a transfer roll coating method. Can be formed.

(Packaging material)
The packaging material of the present invention is characterized by comprising the above-mentioned laminate for packaging material.
The shape of the packaging material is not particularly limited, and may be a bag-like shape as shown in FIG.

In one embodiment, the bag-shaped packaging material can be manufactured by folding and stacking the laminate of the present invention in two so that the heat seal layer is on the inside, and heat-sealing the end thereof. .
In another embodiment, the bag-shaped packaging material can also be manufactured by stacking two laminates so that the heat seal layers face each other, and heat sealing the ends thereof.
In the drawings, the hatched portions represent the heat seal portions.

  The method of heat sealing is not particularly limited, and can be performed by a known method such as a bar seal, a rotating roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal.

  In one embodiment, as shown in FIG. 6, the packaging material has a shape of a stand pouch having a body and a bottom.

  The stand-pouch-shaped packaging material is heat-sealed in a tubular shape so that the heat-sealing layer of the above-mentioned laminate is on the inside, thereby forming a body portion, and then further heat-sealing another laminate. It can be manufactured by folding it into a V shape so that the layer is on the inside, sandwiching it from one end of the body, and heat-sealing to form the bottom.

The content filled in the packaging material is not particularly limited, and the content may be a liquid, a powder, or a gel. Further, the food may be a food or a non-food.
After filling the contents, the opening can be heat sealed to form a package.

  Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1
A 18 μm-thick biaxially stretched polypropylene film (manufactured by Toyobo Co., Ltd., trade name: P2108) is prepared as a base material body, and a polyvinyl alcohol-based barrier coating agent (manufactured by Michelman Co., Ltd.) EKF1407.F) was applied by a gravure method and dried to form a 1 μm-thick barrier coat layer, thereby producing a substrate.

  On the barrier coat layer formed as described above, an image was formed by a gravure printing method using a solvent type gravure ink (manufactured by DIC Graphics Co., Ltd., Finart).

As a polyolefin resin layer, polypropylene (manufactured by TPC Corporation, trade name: FL7540L, density: 0.90 g / cm ³ , melting point: 138 ° C., MFR: 7.0 g / 10 minutes) was extrusion-formed by a T-die method. An unstretched polypropylene film having a thickness of 35 μm was produced.

  A 30-nm-thick aluminum vapor-deposited film was formed on one surface of the polyolefin resin layer produced as described above by a PVD method, to produce a heat seal layer. In addition, when the vapor deposition concentration (OD value) of the formed vapor deposition film was measured, it was 3.0.

  The barrier coat layer surface of the base material and the vapor-deposited film forming surface of the heat seal layer are laminated via a two-component curable polyurethane adhesive (trade name: RU-3600 / H-689, manufactured by Rock Paint Co., Ltd.). Thus, a laminate for packaging material of the present invention was obtained. The proportion of the same polyolefin (PP) in the thus obtained packaging material laminate was 93% by mass.

Example 2
A laminate for packaging material of the present invention was produced in the same manner as in Example 1, except that the thickness of the deposited aluminum film was changed to 20 nm and the OD value of the deposited film was changed to 2.0. The proportion of the same polyolefin (PP) in the thus obtained packaging material laminate was 93% by mass.

Example 3
Example 2 except that the two-part curable polyurethane adhesive was changed to a two-part curable adhesive (manufactured by DIC Corporation, trade name: PASLIM VM001 / VM102CP) containing a polyester polyol, an isocyanate compound and a phosphoric acid-modified compound. In the same manner as in Example 1, a packaging material laminate of the present invention was produced. The proportion of the same polyolefin (PP) in the thus obtained packaging material laminate was 93% by mass.

Example 4
A 18 μm-thick biaxially stretched polypropylene film (manufactured by Toyobo Co., Ltd., trade name: P2108) is prepared as a base material body, and a 30 nm-thick aluminum oxide vapor-deposited film is formed on one surface thereof by a PVD method. I let it.

  Further, a polyvinyl alcohol-based barrier coating agent (MFB7010, manufactured by Michelman Co., Ltd.) was applied on the aluminum oxide vapor-deposited film by a gravure method, and dried to form a 1 μm-thick barrier coat layer, thereby producing a substrate.

  An image was formed on the barrier coat layer of the base material formed as described above by a gravure printing method using a solvent-type gravure ink (manufactured by DIC Graphics Co., Ltd., Finart).

As a polyolefin resin layer, polypropylene (manufactured by TPC Corporation, trade name: FL7540L, density: 0.90 g / cm ³ , melting point: 138 ° C., MFR: 7.0 g / 10 minutes) was extrusion-formed by a T-die method. An unstretched polypropylene film having a thickness of 35 μm was produced.

  On one surface of the polyolefin resin layer produced as described above, a 30 nm-thick aluminum vapor-deposited film as a second vapor-deposited film was formed by a PVD method to prepare a heat seal layer. In addition, when the vapor deposition concentration (OD value) of the formed vapor deposition film was measured, it was 3.0.

  The surface of the base material on which the barrier coat layer is formed and the surface of the heat seal layer on which the aluminum vapor deposition film is formed are interposed with a two-component curable polyurethane adhesive (Rock Paint Co., Ltd., trade name: RU-3600 / H-689). To obtain a laminate for packaging material of the present invention. The proportion of the same polyolefin (PP) in the thus obtained packaging material laminate was 93% by mass.

Example 5
A laminate for packaging material of the present invention was produced in the same manner as in Example 4, except that the thickness of the deposited aluminum film was changed to 20 nm and the OD value of the deposited film was changed to 2.0. The proportion of the same polyolefin (PP) in the thus obtained packaging material laminate was 93% by mass.

Example 6
Example 2 except that the two-part curable polyurethane adhesive was changed to a two-part curable adhesive (manufactured by DIC Corporation, trade name: PASLIM VM001 / VM102CP) containing a polyester polyol, an isocyanate compound and a phosphoric acid-modified compound. In the same manner as in Example 1, a packaging material laminate of the present invention was produced. The proportion of the same polyolefin (PP) in the thus obtained packaging material laminate was 93% by mass.

Comparative Example 1
A laminate for packaging material was obtained in the same manner as in Example 1, except that an unstretched polypropylene film (manufactured by Toyobo Co., Ltd., trade name: P1108) having a thickness of 18 μm was used as the base material body. The proportion of the same polyolefin (PP) in the laminate thus obtained was 93% by mass.

Comparative Example 2
A laminate for packaging material was obtained in the same manner as in Example 1, except that the base material was not provided with a barrier coat layer. The proportion of the same polyolefin (PP) in the thus obtained laminate was 95% by mass.

Comparative Example 3
A laminate for packaging material was obtained in the same manner as in Example 1 except that the base material was a 12-μm-thick biaxially stretched polyester film (manufactured by Toyobo Co., Ltd., trade name: E5100). The proportion of the same polyolefin (PP) in the thus obtained laminate was 69% by mass.

Comparative Example 4
A laminate for packaging material was obtained in the same manner as in Example 4, except that an unstretched polypropylene film (manufactured by Toyobo Co., Ltd., trade name: P1108) having a thickness of 18 μm was used as the substrate body. The proportion of the same polyolefin (PP) in the laminate thus obtained was 93% by mass.

Comparative Example 5
A laminate for packaging material was obtained in the same manner as in Example 4, except that the base material body was a 12-μm-thick biaxially stretched polyester film (manufactured by Toyobo Co., Ltd., trade name: E5100). The proportion of the same polyolefin (PP) in the thus obtained laminate was 69% by mass.

<< Recyclability evaluation >>
The recyclability of the laminate for packaging materials obtained in the above Examples and Comparative Examples was evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
(Evaluation criteria)
：: The content of the same polyolefin in the laminate for packaging material was 80% by mass or more.
X: The content of the same polyolefin in the packaging material laminate was less than 80% by mass.

<< strength evaluation >>
Using a tensile tester (trade name: RTC-1310A, manufactured by Orientec Co., Ltd.), the strength when the needle having a diameter of 0.5 mm was pierced was measured on the laminate for packaging materials produced in the above Examples and Comparative Examples. The piercing speed was 50 mm / min. The measurement results are summarized in Table 1.

<< heat resistance evaluation >>
From the laminate for packaging material obtained in the above Examples and Comparative Examples, two test pieces each having a length of 80 mm and a width of 80 mm were produced.
The two test pieces were overlapped so that the heat-seal layers faced each other, and three sides were heat-sealed at 150 ° C. to produce a pouch-shaped packaging material.
The prepared packaging material was visually observed, and the heat resistance of the packaging material laminate was evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
(Evaluation criteria)
：: No wrinkles or the like were generated on the surface of the packaging material, and no adhesion to the heat seal bar was observed.
×: Wrinkles and the like were generated on the surface of the packaging material, and adhesion to the heat seal bar was observed, and bag making could not be performed.

<< oxygen barrier property evaluation >>
The laminate for packaging materials obtained in the above Examples and Comparative Examples was cut into A4 size, and OXTRAN2 / 20 manufactured by MOCON, USA, was used. The oxygen permeability (cc) under the environment of 23 ° C. and 90% relative humidity was used. / M ² / day / atm). Table 1 summarizes the measurement results.

<< Evaluation of water vapor barrier property >>
The laminate for packaging materials obtained in the above Examples and Comparative Examples was cut into A4 size, and using PERMATRAN 3/31 manufactured by MOCON, USA, water vapor permeability (g in an environment of 40 ° C. and 90% relative humidity) / M ² / day / atm). Table 1 summarizes the measurement results.

<Bending load resistance evaluation>
The bending load (stroke: 155 mm, bending operation: 440) is applied to the laminate for packaging material obtained above using a gelbo flex tester (manufactured by Tester Sangyo Co., Ltd., trade name: BE1006BE) in accordance with ASTM F392. °) 5 times.
After the bending load, the oxygen permeability and the water vapor permeability of the packaging material laminate were measured. Table 1 summarizes the measurement results.

<< Heat sealability test >>
The laminate for packaging materials obtained in the above Examples and Comparative Examples was cut into 10 cm × 10 cm to prepare sample pieces. This sample piece was folded in two so that the heat seal layer was on the inside, and a region of 1 cm × 10 cm was heat-sealed under the conditions of a temperature of 140 ° C., a pressure of 1 kgf / cm ² , and one second.
The heat-sealed sample piece was cut into a strip having a width of 15 mm, and both ends that were not heat-sealed were gripped by a tensile tester, and the peel strength (N / 15 mm) was measured at a speed of 300 mm / min and a load range of 50 N. It was measured. Table 1 summarizes the measurement results.
Note that the packaging material laminate obtained in Comparative Example 1 was attached to the heat seal bar, and the peel strength could not be measured.

10: laminate for packaging material, 11: base material, 12: heat seal layer, 13: base material body, 14: barrier coat layer, 15: evaporated film, 16: polyolefin resin layer, 17: evaporated film, 18: adhesion Layer, 19: first polyolefin resin layer, 20: second polyolefin resin layer

Claims (6)

Comprising a base material and a heat seal layer,
The substrate includes a substrate body and a barrier coat layer,
The heat seal layer includes a vapor-deposited film and a polyolefin resin layer,
The substrate body is a stretched resin film composed of polyolefin,
The polyolefin constituting the base material body and the polyolefin constituting the polyolefin resin layer are the same polyolefin,
The thickness of the barrier coat layer is smaller than the thickness of the base body,
A laminate for packaging materials, wherein the thickness of the vapor-deposited film is smaller than the thickness of the polyolefin resin layer.   The packaging material laminate according to claim 1, wherein the substrate includes a deposition film between the substrate body and the barrier coat layer.   3. The packaging material laminate according to claim 1, further comprising an adhesive layer between the base material and the heat seal layer. 4. The deposited film provided by the heat seal layer is an aluminum deposited film,
The packaging material laminate according to claim 3, wherein the adhesive layer includes a cured product of a resin composition containing a polyester polyol, an isocyanate compound, and a phosphoric acid-modified compound.   The packaging material laminate according to any one of claims 1 to 4, wherein the content of the polyolefin in the entire packaging material laminate is 80% by mass or more.   A packaging material comprising the laminate for packaging material according to any one of claims 1 to 5.

Images