JP2018171777A - Laminate and packaging bag having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate with an improved biomass degree, having a substrate layer and a sealant layer in this order.SOLUTION: A laminate includes at least a substrate layer and a sealant layer. A plastic film composing the substrate layer is one layer in the laminate. The substrate layer includes a polyamide. The sealant layer includes a linear low-density polyethylene derived from a biomass and a low-density polyethylene. The thickness of the sealant layer is 80-150 μm. The laminate is capable of producing a packaging bag excellent in impact resistance and hand tearability.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminate including at least a base material layer and a sealant layer in this order. Furthermore, it is related with a packaging bag provided with this laminated body.

  In recent years, with the growing demand for the establishment of a recycling-oriented society, the use of biomass has been attracting attention in the materials field, as it is desired to move away from fossil fuels as well as energy. Biomass is an organic compound photo-synthesized from carbon dioxide and water, and by using it, it is so-called carbon neutral renewable energy that becomes carbon dioxide and water again. In recent years, biomass plastics using these biomasses as raw materials have been rapidly put into practical use, and attempts have been made to produce various resins from biomass raw materials.

  As a biomass-derived resin, commercial production of polylactic acid (PLA) produced via lactic acid fermentation has begun, but it is biodegradable, and its performance as a plastic is now a general-purpose plastic. Therefore, it has not been widely used due to its limitations in product applications and product manufacturing methods. Moreover, life cycle assessment (LCA) evaluation is performed for PLA, and discussion is made on energy consumption at the time of PLA production, equivalence at the time of replacement of general-purpose plastics, and the like.

  Here, various types such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyester are used as the general-purpose plastic. In particular, polyethylene is molded into films, sheets, bottles, etc., and is used for various applications such as packaging materials, and is used in large amounts all over the world. Therefore, using a conventional fossil fuel-derived polyethylene has a large environmental impact. Therefore, it is desired to reduce the amount of fossil fuel used by using raw materials derived from biomass for the production of polyethylene. For example, a resin film for packaging products using biomass-derived polyethylene has been proposed so far (see Patent Document 1).

JP 2012-251006 A

  The present inventors, together with polyolefins produced using ethylene obtained from conventional fossil fuels (hereinafter sometimes simply referred to as “polyolefins derived from fossil fuels”), biomass polyolefins using biomass-derived ethylene as a raw material By using (hereinafter, sometimes simply referred to as “biomass polyolefin”), a packaging bag having an increased biomass degree was developed while suppressing costs. In the process, when the present inventors mixed two kinds of linear low density polyethylene derived from biomass and linear low density polyethylene derived from fossil fuel to form a sealant layer of a packaging bag, I faced the technical challenge of not being able to achieve a balance between sexuality and hand cutting. Thus, as a result of further studies, the present inventors have found a layer structure of a laminate capable of producing a packaging bag excellent in impact resistance and hand cutting properties, and have completed the present invention.

  Therefore, the objective of this invention is providing the laminated body which can manufacture the packaging bag excellent in impact resistance and hand cutting property, raising the degree of biomass.

According to a first aspect of the invention,
A laminate comprising at least a base material layer and a sealant layer in this order,
The plastic film constituting the base material layer is one in the laminate,
The base material layer includes polyamide;
The sealant layer includes biomass-derived linear low density polyethylene and low density polyethylene,
A laminate in which the thickness of the sealant layer is 80 μm or more and 150 μm or less is provided.

  In the first aspect of the present invention, the sealant layer preferably contains 5% by mass or more and 25% by mass or less of the low density polyethylene.

  In the first aspect of the present invention, it is preferable that the sealant layer further includes a linear low density polyethylene derived from fossil fuel.

  In the 1st aspect of this invention, it is preferable that the said sealant layer contains 75 to 95 mass% in total of the linear low density polyethylene derived from the said biomass and / or a fossil fuel.

  In the 1st aspect of this invention, it is preferable that the biomass degree of the said sealant layer is 5% or more and 30% or less.

  In the first aspect of the present invention, it is preferable that the laminate further includes a printing layer between the base material layer and the sealant layer.

  In the first aspect of the present invention, it is preferable that the laminate further includes an adhesive layer between the base material layer and the sealant layer.

  In the 2nd aspect of this invention, a packaging bag provided with the said laminated body is provided.

  The laminate according to the present invention includes at least a base material layer containing polyamide and a sealant layer in this order, and the sealant layer includes biomass-derived linear low density polyethylene and low density polyethylene, and the sealant. When the thickness of the layer is 80 μm or more and 150 μm or less, it is possible to manufacture a packaging bag excellent in impact resistance and hand cutting property while increasing the degree of biomass.

It is a schematic cross section which shows an example of the laminated body by this invention. It is a schematic cross section which shows an example of the laminated body by this invention. It is a model front view which shows an example of the refilling pouch by this invention.

<Laminate>
The laminate according to the present invention comprises at least a base material layer and a sealant layer in this order. The plastic film which comprises a base material layer is one in a laminated body. One plastic film may be formed by a plurality of base material layers. That is, the plastic film constituting the base material layer may be a co-pressing film having a plurality of layers. As long as the plastic film which comprises a base material layer is one in a laminated body, a laminated body may further be further equipped with a printing layer, an adhesive layer, another layer, etc. When the laminate includes two or more other layers, each may have the same composition or a different composition.

The laminate according to the present invention will be described with reference to the drawings. Examples of schematic cross-sectional views of the laminate according to the present invention are shown in FIGS.
A laminate 10 shown in FIG. 1 includes a base material layer 11 and a sealant layer 12 in this order. As for the packaging bag provided with the laminated body 10, the sealant layer 12 is located in the inner surface side.
The laminated body 20 shown in FIG. 2 is provided with the base material layer 21, the printing layer 23, the contact bonding layer 24, and the sealant layer 22 in this order. As for the packaging bag provided with the laminated body 20, the sealant layer 22 is located in the inner surface side.
Hereinafter, each layer which comprises a laminated body is demonstrated.

[Base material layer]
The laminate according to the present invention includes at least a base material layer. By providing the base material layer, when the packaging bag is manufactured, hand cutting property and strength can be improved.

  The base material layer is a resin layer containing polyamide. The base material layer is preferably stretched, and biaxially stretched. Examples of the polyamide include nylon 6, nylon 6,6, nylon 9, nylon 11, nylon 12, nylon 6/66, nylon 66/610, nylon MXD6, and the like. By providing the polyamide resin layer as the base material layer, the puncture strength and the like can be improved when the packaging bag is manufactured.

When the base material layer is a stretched nylon film, the stretched nylon film used for the base material layer has a tensile strength in the MD direction, preferably 150 MPa or more and 350 MPa or less, more preferably 200 MPa or more and 300 MPa or less, preferably TD direction. 150 MPa to 400 MPa, more preferably 200 MPa to 350 MPa, and the tensile elongation is MD direction, preferably 50% to 200%, more preferably 70% to 150%, and TD direction. Preferably they are 30% or more and 200% or less, More preferably, they are 50% or more and 150% or less.
The tensile strength and tensile elongation can be measured in accordance with JIS K 7127.

  The base material layer preferably has a thickness of 15 μm or more and 25 μm or less. If the thickness of the base material layer is in the above range, the molding process is easy and it can be suitably used as a packaging material.

[Sealant layer]
The laminate according to the present invention includes a sealant layer that is an innermost layer when a packaging bag is manufactured. The sealant layer includes biomass-derived linear low density polyethylene (LLDPE) and low density polyethylene (LDPE), and may further include a linear low density polyethylene derived from fossil fuel. Further, the low density polyethylene may be derived from biomass or derived from fossil fuel. When the sealant layer contains both the biomass-derived linear low-density polyethylene and the low-density polyethylene, it is possible to achieve both excellent impact resistance and excellent hand cutting properties when a packaging bag is manufactured.

  The content of low-density polyethylene in the sealant layer (when two types derived from biomass and fossil fuel are included, the total content) is preferably 5% by mass to 25% by mass, more preferably 10% by mass to 20%. It is below mass%. In addition, the content of the linear low density polyethylene derived from biomass and / or fossil fuel in the sealant layer (when two types are included, the total content) is preferably 75% by mass to 95% by mass, and more Preferably they are 80 mass% or more and 90 mass% or less. By mixing the low density polyethylene and the linear low density polyethylene in the above ratio in the sealant layer, it is possible to achieve both excellent impact resistance and excellent hand cutting properties when the packaging bag is manufactured.

  The sealant layer preferably has a biomass degree of 5% to 30%, more preferably 10% to 25%, and still more preferably 15% to 20%. In addition, in this invention, "biomass degree" shows the weight ratio of a biomass origin component. If the degree of biomass is in the above range, the amount of fossil fuel used can be reduced while reducing costs, and the environmental load can be reduced.

The “biomass degree” (carbon concentration derived from biomass) is a value of C14 content obtained by a radioactive carbon (C14) measurement method based on ASTM-D6866. Since carbon dioxide in the atmosphere contains C14 at a constant ratio (105.5 pMC), the C14 content in plants that grow by incorporating carbon dioxide in the atmosphere, for example, corn, is also about 105.5 pMC. It is known. It is also known that fossil fuel contains almost no C14. Therefore, the proportion of carbon derived from biomass can be calculated by measuring the proportion of C14 contained in all carbon atoms in the sealant layer. In the present invention, the biomass-derived carbon content Pbio when the content of C14 in the sealant layer is PC14 can be obtained as follows.
Pbio (%) = PC14 / 105.5 × 100
Note that PMC is an abbreviation for Percent Modern Carbon.

  Biomass polyethylene is a monomer polymer containing biomass-derived ethylene. Since ethylene derived from biomass is used as a monomer as a raw material, the polymerized polyolefin is derived from biomass. The content of ethylene derived from biomass in the raw material monomer is not necessarily 100% by mass, and is preferably 50% or more, more preferably 80% or more, for example. The raw material monomer may contain fossil fuel-derived ethylene, and may contain α-olefin monomers such as butylene, hexene, and octene. Even in such a case, the obtained polymer is called biomass polyethylene. By including an α-olefin, the polymerized polyolefin has an alkyl group as a branched structure, and therefore can be more flexible than a simple linear one.

  For example, biomass-derived ethylene can be produced using biomass-derived ethanol as a raw material. In particular, it is preferable to use biomass-derived fermented ethanol obtained from plant raw materials. A plant raw material is not specifically limited, A conventionally well-known plant can be used. For example, corn, sugar cane, beet, and manioc can be mentioned.

  In the present invention, biomass-derived fermented ethanol refers to ethanol that has been purified after contacting a microorganism-producing product or a crushed product thereof with a culture solution containing a carbon source obtained from plant raw materials. For the purification of ethanol from the culture solution, conventionally known methods such as distillation, membrane separation, and extraction can be applied. For example, a method of adding benzene, cyclohexane or the like and azeotropically or removing water by membrane separation or the like can be mentioned.

  Linear low density polyethylene is obtained by polymerizing ethylene and a small amount of α-olefin by low pressure polymerization (gas phase polymerization using Ziegler-Natta catalyst or liquid phase polymerization using metallocene catalyst). . The low density polyethylene is obtained by polymerizing ethylene by a high pressure polymerization method. Linear low density polyethylene has many short molecular chains in the molecular chain and is excellent in sealing performance.

Linear low density polyethylene and low density polyethylene is less than 0.93 g / cm ^3, preferably 0.91 g / cm ³ or more 0.93 g / cm less than ^3, more preferably 0.912 g / cm ³ or more 0.928g / Cm ³ or less, more preferably 0.915 g / cm ³ or more and 0.925 g / cm ³ or less. The MFR of linear low density polyethylene may be lower than the MFR of low density polyethylene. The density of the linear low density polyethylene and the low density polyethylene is a value measured according to the method defined in Method A of JIS K7112-1980 after annealing described in JIS K6760-1995. If the density of the linear low density polyethylene and the low density polyethylene is 0.91 g / cm ³ or more, the rigidity of the sealant layer containing the linear low density polyethylene and the low density polyethylene can be increased, and the inner layer of the packaging bag It can be used suitably. Moreover, if the density of linear low density polyethylene and low density polyethylene is less than 0.93 g / cm < ³ >, the mechanical strength of a sealant layer can be raised and it can use suitably as an inner layer of a packaging bag.

  The linear low density polyethylene and the low density polyethylene are 0.1 g / 10 min or more and 10 g / 10 min or less, preferably 0.2 g / 10 min or more and 9 g / 10 min or less, more preferably 1 g / 10 min or more and 8. It has a melt flow rate (MFR) of 5 g / 10 min or less. The MFR of linear low density polyethylene may be lower than the MFR of low density polyethylene. The melt flow rate is a value measured by the method A under the conditions of a temperature of 190 ° C. and a load of 21.18 N in the method defined in JIS K7210-1995. If the MFR of the linear low density polyethylene and the low density polyethylene is 0.1 g / 10 min or more, the extrusion load during the molding process can be reduced. Moreover, if the MFR of the linear low density polyethylene and the low density polyethylene is 10 g / 10 min or less, the mechanical strength of the sealant layer can be increased.

In the present invention, biomass polyethylene suitably used is a biomass-derived linear low-density polyethylene (trade name: SLL118, density: 0.916 g / cm ³ , MFR: 1.0 g / 10 minutes) manufactured by Braschem. , Biomass degree 87%), biomass-derived linear low density polyethylene (trade name: SLL318, density: 0.918 g / cm ³ , MFR: 2.7 g / 10 min, biomass degree 87%), A linear low-density polyethylene derived from biomass manufactured by Braschem (trade name: SLH218, density: 0.916 g / cm ³ , MFR: 2.3 g / 10 min, biomass degree 87%), derived from biomass manufactured by Braschem low-density polyethylene (trade name: SBC818, ^{density: 0.918g / cm 3, MFR:} 8.1g / 10 minutes, Biomass of 95%), Braskem manufactured by low-density polyethylene (trade name derived biomass: SPB681, ^{Density: 0.922g / cm 3, MFR:} 3.8g / 10 min, the biomass of 95%), manufactured by Braskem Inc. Biomass-derived low density polyethylene (trade name: STN7006, density: 0.923 g / cm ³ , MFR: 0.6 g / 10 min, biomass degree 95%), and the like.

  Biomass-derived linear low-density polyethylene is produced, for example, using sugarcane as a raw material. The degree of dispersion of such a low-density polyethylene derived from sugarcane can be 4 or more and 7 or less. On the other hand, the degree of dispersion of the fossil-derived linear low-density polyethylene is usually from 1.5 to 3.5.

  The sealant layer has a thickness of 80 μm to 150 μm, preferably 90 μm to 140 μm, more preferably 100 μm to 130 μm. When the thickness of the sealant layer is in the above range, it is possible to achieve both excellent impact resistance and excellent hand cutting properties when a packaging bag is manufactured.

[Print layer]
The printed layer can be used to display decorations, contents, display of the best-before period, display of manufacturers, sellers, etc., and display of other characters and letters, numbers, pictures, figures, symbols, patterns, etc. It is a layer for forming a desired arbitrary printed pattern. A printing layer can be provided as needed and can be provided between a base material layer and a sealant layer. The printing layer may be provided on the entire surface of the base material layer, or may be provided on a part thereof. A printing layer can be formed using a conventionally well-known pigment and dye, The formation method is not specifically limited.

  The printed layer preferably has a thickness of 0.1 μm to 10 μm, more preferably 1 μm to 5 μm, and still more preferably 1 μm to 3 μm.

[Adhesive layer]
The adhesive layer is a layer provided when two arbitrary layers are bonded, and can be provided between the base material layer and the sealant layer.

  When two layers are bonded by a dry laminating method, the adhesive layer can be an adhesive layer formed by applying an adhesive to the surface of the layer to be laminated and drying it. Examples of the adhesive include one-part or two-part cured or non-cured vinyl, (meth) acrylic, polyamide, polyester, polyether, polyurethane, epoxy, rubber, etc. An adhesive such as a solvent type, an aqueous type, or an emulsion type can be used. As a two-component curable adhesive, a cured product of a polyol and an isocyanate compound can be used. As a coating method of the adhesive for laminating, for example, direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, fountain method, transfer roll coating method, and other methods can be used. .

  The adhesive layer may be an adhesive resin layer used when two layers are bonded by a sand lamination method. Examples of the thermoplastic resin that can be used for the adhesive resin layer include a polyethylene resin, a polypropylene resin, or a cyclic polyolefin resin, or a copolymer resin, a modified resin, or a mixture (including alloy) containing these resins as a main component. ) Can be used. Examples of polyolefin resins include low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear (linear) low density polyethylene (LLDPE), polypropylene (PP), and metallocene catalysts. Ethylene-α / olefin copolymer, ethylene / polypropylene random or block copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene Ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene / maleic acid copolymer, ionomer resin, and interlayer adhesion In order to improve the , It can be used acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and an acid-modified polyolefin resin modified with an unsaturated carboxylic acid such as itaconic acid. Further, a resin obtained by graft polymerization or copolymerization of an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or an ester monomer can be used as the polyolefin resin. These materials can be used alone or in combination of two or more. As the cyclic polyolefin-based resin, for example, cyclic polyolefins such as ethylene-propylene copolymer, polymethylpentene, polybutene, and polynorbornene can be used. These resins can be used alone or in combination. In addition, as said polyethylene-type resin, what used the above ethylene derived from biomass as a monomer unit can be used, and a biomass degree can further be improved.

  When the adhesive resin layer is laminated by the melt extrusion laminating method, an anchor coat layer formed by applying an anchor coat agent and drying it may be provided on the surface of the layer to be laminated. Examples of the anchor coating agent include an anchor coating agent made of any resin having a heat resistant temperature of 135 ° C. or higher, such as a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin, or a polyethyleneimine. An anchor coating agent that is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups and an isocyanate compound as a curing agent can be preferably used. Moreover, a silane coupling agent may be used in combination as an additive, and nitrified cotton may be used in combination in order to improve heat resistance.

  There may be one adhesive layer in the laminate, or two or more may be included. For example, when two adhesive layers are included in the laminate, one adhesive layer may be referred to as an adhesive layer, and the other adhesive layer may be referred to as a second adhesive layer.

  The anchor coat layer after drying has a thickness of 0.1 μm or more and 1 μm or less, preferably 0.3 μm or more and 0.5 μm or less. The adhesive layer after drying has a thickness of 1 μm to 10 μm, preferably 2 μm to 5 μm. The adhesive resin layer preferably has a thickness of 5 μm to 50 μm, preferably 10 μm to 30 μm.

[Other layers]
The laminate according to the present invention may include a barrier layer as another layer. The barrier layer is provided to extend the shelf life of the contents, such as a metal foil such as aluminum, a metal oxide such as aluminum, a metal oxide such as aluminum oxide, or an inorganic oxide vapor deposition layer such as silicon oxide, ethylene -A resin layer having gas barrier properties such as vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC), and aromatic polyamide such as nylon MXD6 can be used. Further, on the deposited layer, the general formula ^{_{R 1 n M (OR 2)}} m ( where in the ^formula, R 1, ^{R 2} represents 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 a valence of M), and a polyvinyl alcohol as described above A transparent gas barrier composition containing a benzene-based resin and / or an ethylene / vinyl alcohol copolymer, and further polycondensed by a sol-gel method in the presence of a sol-gel method catalyst, acid, water, and an organic solvent. The obtained gas barrier coating film may be provided.

<Method for producing laminate>
The manufacturing method of the laminated body by this invention is not specifically limited, It can manufacture using conventionally well-known methods, such as a dry lamination method and a sand lamination method.

  The laminate according to the present invention is provided with chemical functions, electrical functions, magnetic functions, mechanical functions, friction / abrasion / lubrication functions, optical functions, thermal functions, surface functions such as biocompatibility, etc. For the purpose, it is also possible to perform secondary processing. Examples of secondary processing include embossing, painting, adhesion, printing, metalizing (plating, etc.), machining, surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, Coating, etc.). Further, the laminate according to the present invention can be subjected to laminating processing (dry laminating or extrusion laminating), bag making processing, and other post-processing processing to produce a molded product.

<Packaging bag>
The packaging bag by this invention is provided with the said laminated body. For example, the above laminate is used, and the laminate is folded in two, or two laminates are prepared, and the surfaces of the sealant are opposed to each other, and the peripheral end portion thereof is, for example, a side seal type , Two-side seal type, three-side seal type, four-side seal type, envelope-attached seal type, joint-attached seal type (pillow seal type), pleated seal type, flat bottom seal type, square bottom seal type, gusset type, etc. Thus, various forms of packaging bags can be manufactured.

  In the above, as a heat sealing method, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be used.

  Since the packaging bag has excellent impact resistance and hand cutting properties while exhibiting a high degree of biomass, it can be suitably used particularly as a refill pouch for sealing and packaging shampoo, rinse, food, etc. for refill. .

The packaging bag by this invention is demonstrated referring drawings. An example of a schematic front view of a refillable pouch according to the present invention is shown in FIG.
The refill pouch 100 shown in FIG. 3 is manufactured in a standing pouch format, and the bottom portion of the pouch is placed between the lower portions of the front and rear wall films (using the above laminate) 101, 101 ′. (It may be the same as or different from the film) It is formed in a form having a gusset portion 104 formed by folding 103 inward and inserting it to the bottom film folding portion 102, and in the vicinity of the lower ends on both sides of the bottom film folded inward In this case, semi-circular bottom film cutout portions 103a and 103b are provided, and the gusset portion 104 is heat-sealed with a bottom-shaped bottom seal portion 105 that is concave in a curved line shape from both sides to the center. Form. Further, the body portion of the pouch is formed by heat-sealing the edge portions on both sides of the front and back wall films 101 and 101 ′ with the side seal portions 106 a and 106 b, and at one corner portion (see FIG. 3 on the left corner) is a tapered shape formed by heat-sealing the outer periphery with a spout portion seal portion 107 and having a narrow width and facing obliquely outwardly upward. 109b is provided in a protruding shape. In addition, a portion of the upper portion of the pouch 100 where the spout 110 is not provided is heat-sealed by the upper seal portion 108, but this portion is used as a filling port for the content. It is used as an opening of the seal, and heat sealing is performed after filling the contents. In the above-described example, the example in which the refill pouch 100 is configured using two wall films and one bottom film is described. However, the refill pouch is configured using one film or two films. You may make it do.

  Furthermore, the refilling pouch 100 includes a half-cut line 111 and a notch 112 at an upper end thereof as an easy-opening means at the opening position on the distal end side of the spout portion 110. In addition, the half-cut line 111 is shown by three parallel half-cut lines in FIG. 3, but in addition to one or two, a plurality of half-cut lines 111 such as one to three on both sides of the central half-cut line Arbitrary shape, such as a shape that converges the half-cut line in parallel or in the center half-cut line, or a combination of multiple parallel half-cut lines and diagonal half-cut lines that cross diagonally It can be provided in a shape.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples.

[Example 1]
<Preparation of laminated body 1>
A biaxially stretched nylon film (thickness 25 μm, manufactured by Unitika Ltd., trade name: ON) was prepared as a first base material layer, and a printing layer was formed on one surface of the nylon film by gravure printing. In addition, 60 parts by mass of fossil fuel-derived linear low density polyethylene (density: 0.918 g / cm ³ , MFR: 3.8 g / 10 min, biomass degree: 0%) and fossil fuel-derived low density polyethylene ( Density: 0.924 g / cm ³ , MFR: 2.0 g / 10 min, biomass degree: 0% 20 parts by mass, biomass-derived linear low density polyethylene (LLDPE, manufactured by Braschem, trade name: SLL118, 20 parts by mass of density: 0.916 g / cm ³ , MFR: 1.0 g / 10 min, biomass degree 87%) was melt-kneaded to obtain a resin composition. Subsequently, the obtained resin composition was formed into a film by a top blow air-cooled inflation coextrusion film forming machine to obtain a polyethylene film 1 for a sealant layer (thickness: 130 μm, biomass degree: 17.4%). Next, the printing surface of the nylon film and the polyethylene film 1 are bonded together using a two-component curable adhesive (manufactured by Rock Paint Co., Ltd., RU-40 / H-5), and a base material layer is printed. A laminate 1 was obtained in which a layer, an adhesive layer, and a sealant layer were sequentially laminated.

[Example 2]
<Preparation of laminated body 2>
The blend of the polyethylene film 1 for the sealant layer is added to 70 parts by mass of linear low density polyethylene derived from fossil fuel, 10 parts by mass of low density polyethylene derived from fossil fuel, and 20 parts by mass of linear low density polyethylene derived from biomass. Except having changed, it carried out similarly to Example 1, and obtained the laminated body 2. FIG.

[Example 3]
<Preparation of laminate 3>
The blend of the polyethylene film 1 for the sealant layer is added to 55 parts by mass of linear low density polyethylene derived from fossil fuel, 25 parts by mass of low density polyethylene derived from fossil fuel, and 20 parts by mass of linear low density polyethylene derived from biomass. Except having changed, it carried out similarly to Example 1, and obtained the laminated body 3. FIG.

[Example 4]
<Preparation of laminate 4>
A laminate 4 was obtained in the same manner as in Example 1 except that the thickness of the polyethylene film 1 for the sealant layer was changed to 80 μm.

[Example 5]
<Preparation of laminated body 5>
A laminate 5 was obtained in the same manner as in Example 1 except that the thickness of the polyethylene film 1 for the sealant layer was changed to 150 μm.

[Comparative Example 1]
<Preparation of laminate 6>
A laminate 6 was obtained in the same manner as in Example 1 except that the thickness of the polyethylene film 1 for the sealant layer was changed to 60 μm.

[Comparative Example 2]
<Preparation of laminate 7>
Except for changing the blend of the polyethylene film 1 for the sealant layer to 80 parts by mass of linear low density polyethylene derived from fossil fuel and 20 parts by mass of linear low density polyethylene derived from biomass, the same as in Example 1, A laminate 7 was obtained.

<Manufacture of pouches>
Two-component stretch-bonded nylon film (thickness 15 μm, manufactured by Unitika Co., Ltd., trade name: ON) and polyethylene film (thickness 150 μm, manufactured by Tamapoli Co., Ltd., trade name: UB-OB) A bottom film was obtained by pasting together using an agent (manufactured by Rock Paint Co., Ltd., RU-40 / H-5). Subsequently, using the laminate obtained in Example 1 as the wall film and the above bottom film, the outer dimensions: height 220 mm × width 130 mm, bottom folding portion height 40 mm, and seal width 5 mm are shown in FIG. The standing pouch shown in FIG. The bottom was heat sealed with a boat bottom type seal pattern. Similarly, the standing pouch shown in FIG. 3 was produced using the laminates obtained in Examples 2 to 5 and Comparative Examples 1 and 2 as the wall film and the bottom film.

<Impact resistance test>
Each pouch obtained above was filled with 400 cc of water and sealed by heat sealing. Next, these pouches were repeatedly dropped 10 times from a height of 1.2 m with the bottom portion facing downward, and evaluated according to the following criteria. The evaluation results are shown in Table 1.
(Evaluation criteria)
○: The pouch did not break.
X: The pouch was broken.

<Hand cutting test>
Three standing pouches shown in FIG. 3 each prepared in the same manner as described above were prepared using the laminates obtained in the examples and comparative examples. Then, the hand cutting property when cut along the half-cut line was confirmed using the notch provided in the spout part of the standing pouch as a base point.
(Evaluation criteria)
○: All three samples could be cut without applying excessive force.
X: Even one sample could not be cut unless excessive force was applied.

The results of the performance evaluation test are shown in Table 1.

10, 20 Laminate 11, 21 Base material layer 12, 22 Sealant layer 23 Print layer 24 Adhesive layer 100 Refill pouch 101, 101 'Wall surface film 102 Bottom film folded part 103 Bottom film 103a, 103b Bottom film notch part 104 Gusset part 105 Bottom seal portion 106a, 106b Side seal portion 107 Spout portion seal portion 108 Top seal portion 109a, 109b Notch portion 110 Spout portion 111 Half-cut wire 112 Notch

Claims (8)

A laminate comprising at least a base material layer and a sealant layer in this order,
The plastic film constituting the base material layer is one in the laminate,
The base material layer includes polyamide;
The sealant layer includes biomass-derived linear low density polyethylene and low density polyethylene,
The laminated body whose thickness of the said sealant layer is 80 micrometers or more and 150 micrometers or less.   The laminate according to claim 1, wherein the sealant layer contains 5% by mass to 25% by mass of the low-density polyethylene.   The laminated body of Claim 1 or 2 in which the said sealant layer further contains the linear low density polyethylene derived from a fossil fuel.   The laminate according to claim 3, wherein the sealant layer contains a total of 75% by mass or more and 95% by mass or less of linear low density polyethylene derived from the biomass and / or fossil fuel.   The laminated body as described in any one of Claims 1-4 whose biomass degree of the said sealant layer is 5% or more and 30% or less.   The laminate according to any one of claims 1 to 5, wherein the laminate further comprises a printing layer between the base material layer and the sealant layer.   The laminate according to any one of claims 1 to 6, wherein the laminate further comprises an adhesive layer between the base material layer and the sealant layer.   A packaging bag provided with the laminated body as described in any one of Claims 1-7.

Images