Packaging materials and products

Abstract

To provide a packaging material having an enhanced biomass degree.SOLUTION: A packaging material includes at least a base material layer, a print layer, an adhesive layer, and a sealant layer, wherein the print layer contains a cured product of polyol and an isocyanate compound, at least one of the polyol and the isocyanate compound contains a biomass-derived component, the polyol of the print layer is polyester polyol of a reaction product of polyfunctional alcohol and a polyfunctional carboxylic acid, one of the polyfunctional alcohol and the polyfunctional carboxylic acid of the print layer contains a biomass-derived component, and the other thereof is a fossil fuel-derived component, the print layer has thickness of 0.1 μm or more and 10 μm or less, a thermoplastic resin constituting the sealant layer is derived from a fossil fuel, and the thermoplastic resin contains polypropylene or a propylene-ethylene copolymer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to packaging materials that include biomass-derived components and packaged products that include the packaging materials. [Background technology]

[0002] Conventionally, various packaging materials have been developed and proposed as packaging materials for constituting packaged products in which various items such as food and beverages, medicines, chemicals, cosmetics, sanitary products, daily necessities, etc. are filled and packaged. The packaging materials are composed of a laminate in which at least a base layer containing a stretched plastic or the like and a sealant layer for welding the packaging materials together are laminated. Usually, the laminate further includes a printing layer for forming a printed pattern and an adhesive layer for bonding each layer of the laminate.

[0003] In recent years, with the growing demand for the creation of a recycling-oriented society, there is a desire to move away from fossil fuels in the field of laminates that make up packaging materials, just as in the field of energy, and the use of biomass has attracted attention. Biomass is an organic compound that is photosynthesized from carbon dioxide and water, and by using it, it is converted back into carbon dioxide and water, making it a so-called carbon-neutral renewable energy. Recently, the practical application of biomass plastics made from these biomass raw materials has progressed rapidly, and attempts are being made to produce various resins from biomass raw materials.

[0004] As a biomass-derived resin, polylactic acid (PLA), which is produced via lactic acid fermentation, was the first to be commercially produced, but since its performance as a plastic differs greatly from current general-purpose plastics, including its biodegradability, there are limitations to its product applications and manufacturing methods, and it has not yet become widely used.In addition, a life cycle assessment (LCA) is being conducted on PLA, and discussions are being held on the energy consumption during PLA production and its equivalence when replacing general-purpose plastics.

[0005] Here, various types of general-purpose plastics are used, such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyester. In particular, polyethylene is molded into films, sheets, bottles, and the like, and is used in various applications such as packaging materials, and is used in large quantities around the world. Therefore, using conventional polyethylene derived from fossil fuels places a large burden on the environment. For this reason, it is desirable to use raw materials derived from biomass in the production of polyethylene to reduce the amount of fossil fuel used. For example, research has been conducted to date on the production of ethylene and butylene, which are raw materials for polyolefin resins, from renewable natural raw materials (see Patent Document 1).

[0006] In addition, polyesters are widely used in various industrial applications because they are inexpensive and have excellent mechanical properties, chemical stability, heat resistance, transparency, etc. Polyesters are obtained by polycondensation of diol units and dicarboxylic acid units. For example, polyethylene terephthalate (hereinafter sometimes abbreviated as PET) is produced by esterifying ethylene glycol and terephthalic acid as raw materials and then polycondensing them. These raw materials are produced from petroleum, which is a fossil resource. For example, ethylene glycol is industrially produced from ethylene, and terephthalic acid is industrially produced from xylene.

[0007] Recently, attempts have been made to produce polyester from biomass raw materials. For example, a polyester resin containing ethylene glycol derived from biomass as a monomer component has been put to practical use. It has been proposed to use such polyester resin containing biomass-derived raw materials in packaging materials (see Patent Document 2). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Special Publication No. 2011-506628 [Patent Document 2] JP 2012-96410 A Summary of the Invention [Problem to be solved by the invention]

[0009] In conventional packaging materials, the printed layer of the laminate is formed from a material derived from fossil fuels, which reduces the biomass content of the entire packaging material. Therefore, in packaging materials composed of a laminate including a base layer, a printed layer, an adhesive layer, and a sealant layer, there is a demand for increasing the biomass content of the entire packaging material.

[0010] The present invention has been made in consideration of these points, and an object of the present invention is to provide a packaging material with an increased biomass content. [Means for solving the problem]

[0011] The present invention is a packaging material including at least a base layer, a printed layer, an adhesive layer, and a sealant layer, wherein the printed layer includes a cured product of a polyol and an isocyanate compound, and at least one of the polyol and the isocyanate compound includes a biomass-derived component, the polyol of the printed layer is a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, one of the polyfunctional alcohol and the polyfunctional carboxylic acid of the printed layer includes a biomass-derived component and the other is derived from a fossil fuel, the printed layer has a thickness of 0.1 μm or more and 10 μm or less, the thermoplastic resin constituting the sealant layer is derived from a fossil fuel, and the thermoplastic resin includes polypropylene or a propylene-ethylene copolymer.

[0012] In the packaging material according to the present invention, the isocyanate compound of the printed layer may contain a biomass-derived component.

[0013] In the packaging material according to the present invention, the substrate layer may comprise a substrate film comprising polyester, polyamide or polyolefin.

[0014] In the packaging material according to the present invention, the base film may contain a biomass polyester having ethylene glycol derived from biomass as the diol unit and a dicarboxylic acid derived from a fossil fuel as the dicarboxylic acid unit.

[0015] In the packaging material according to the present invention, the adhesive layer may contain a cured product of a polyol and an isocyanate compound.

[0016] In the packaging material according to the present invention, the polyol of the adhesive layer may be a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate.

[0017] The present invention is a packaging product comprising the packaging material described above. Effect of the Invention

[0018] According to the present invention, the biomass content of packaging materials can be increased. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic cross-sectional view showing an example of a packaging material according to the present invention. [Diagram 2] FIG. 1 is a schematic cross-sectional view showing an example of a packaging material according to the present invention. [Diagram 3] FIG. 1 is a schematic cross-sectional view showing an example of a packaging material according to the present invention. [Figure 4] FIG. 1 is a schematic cross-sectional view showing an example of a packaging material according to the present invention. [Diagram 5] FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. [Figure 6] FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. [Figure 7] FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. [Figure 8] FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. [Figure 9] FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. [Figure 10] FIG. 1 is a diagram showing the layer configuration of the packaging materials of Examples 1A to 1L. [Figure 11] FIG. 1 is a diagram showing the layer structures of the packaging materials of Examples 1A and 2A to 11. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] <Packaging materials> The laminate constituting the packaging material according to the present invention includes at least a base layer, a printed layer, an adhesive layer, and a sealant layer. In the present invention, the printed layer is formed from a material containing a biomass-derived component, thereby making it possible to reduce the amount of fossil fuel used compared to conventional methods and to reduce the environmental load.

[0021] In the present invention, the biomass ratio, which will be described below, of the entire laminate constituting the packaging material is preferably 3% or more, more preferably 5% to 60%, and even more preferably 10% to 60%. If the biomass ratio is within the above range, the amount of fossil fuel used can be reduced, and the environmental load can be reduced.

[0022] The laminate constituting the packaging material preferably has a thickness of 10 μm or more and 500 μm or less, more preferably 20 μm or more and 300 μm or less, and even more preferably 30 μm or more and 200 μm or less.

[0023] The packaging material according to the present invention may further have at least one other layer, such as a barrier layer, such as a metal foil, a vapor deposition layer, a gas barrier coating film, etc. When the packaging material has two or more other layers, they may have the same composition or different compositions.

[0024] The laminate constituting the packaging material according to the present invention will be described with reference to the drawings. Examples of schematic cross-sectional views of the packaging material 10 according to the present invention are shown in Figs. 1 to 4. In Figs. 1 to 4, the reference numeral 10y denotes the outer surface of the packaging material 10, and the reference numeral 10x denotes the inner surface of the packaging material 10. The inner surface 10x is the surface located on the side of the contents contained in the packaging product, such as a bag formed from the packaging material 10. The outer surface 10y is the surface located opposite the inner surface 10x. In the present application, the term "in this order" in descriptions such as "provided in this order" and "laminated in this order" denotes the order in the direction from the outer surface 10y side toward the inner surface 10x side, unless otherwise specified.

[0025] 1 includes, in this order, a base material layer 20, a print layer 50, an adhesive layer 30, and a sealant layer 40. The base material layer 20 includes a base material film 22. The sealant layer 40 includes a sealant film .

[0026] The packaging material 10 shown in FIG. 2 is obtained by providing a barrier layer 60 between the base film 22 and the printed layer 50 of the packaging material 10 in FIG.

[0027] The packaging material 10 shown in FIG. 3 is obtained by providing a barrier layer 60 between the adhesive layer 30 and the sealant film 42 of the packaging material 10 shown in FIG.

[0028] In addition, the packaging material 10 shown in Figure 4 has a first barrier layer 61 provided between the base film 22 and the printed layer 50 of the packaging material 10 in Figure 1, and further has a second barrier layer 62 provided between the adhesive layer 30 and the sealant film 42.

[0029] The packaging material 10 shown in Figures 2 to 4 includes a barrier layer 60, 61, or 62, but the barrier layer may be a single-layer structure such as a metal foil or a vapor deposition layer, or may be a laminate structure in which a gas barrier coating film is formed on a vapor deposition layer.

[0030] It is also possible to appropriately combine a plurality of layer structures of the packaging material 10 shown in the above-mentioned Figs. 1 to 4.

[0031] Each layer constituting the packaging material 10 will now be described.

[0032] (Base film) The base film 22 of the base layer 20 is a plastic film. The base film 22 may or may not contain a biomass-derived component.

[0033] When the base film 22 contains a biomass-derived component, the base film 22 can be formed using the biomass polyester or biomass polyethylene described below.

[0034] Biomass polyester has ethylene glycol derived from biomass as a diol unit and dicarboxylic acid derived from fossil fuel as a dicarboxylic acid unit. In addition to biomass polyester, the base layer may further contain a polyester derived from fossil fuel having ethylene glycol derived from fossil fuel as a diol unit and dicarboxylic acid derived from fossil fuel as a dicarboxylic acid unit. It is sufficient that the base layer as a whole can achieve the following biomass degree. In the present invention, by the base layer containing biomass polyester, the amount of polyester derived from fossil fuel can be reduced compared to the conventional method, thereby reducing the environmental load.

[0035] In the present invention, the "biomass degree" may be expressed as a value obtained by measuring the content of carbon derived from biomass by radiocarbon (C14) measurement, or may be expressed as a weight ratio of components derived from biomass.

[0036] When the value of the content of carbon derived from biomass measured by radiocarbon (C14) measurement is indicated as the "biomass degree", the "biomass degree" can be calculated as follows. That is, since carbon dioxide in the atmosphere contains a certain proportion of C14 (105.5 pMC), it is known that the C14 content in plants that grow by absorbing carbon dioxide from the atmosphere, such as corn, is also about 105.5 pMC. It is also known that fossil fuels contain almost no C14. Therefore, the proportion of carbon derived from biomass can be calculated by measuring the proportion of C14 in the total carbon atoms in the polyester. In the present invention, the C14 content in the polyester is expressed as P C14 The content of carbon derived from biomass, P bio It can be calculated as follows: P bio (%)=P C14 / 105.5×100 Note that pMC stands for Percent Modern Carbon.

[0037] Taking polyethylene terephthalate, a typical polyester, as an example, polyethylene terephthalate is a polymer of ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms in a molar ratio of 1:1. Therefore, if only biomass-derived ethylene glycol is used, the content of biomass-derived carbon in polyethylene terephthalate, P bio On the other hand, the content of biomass-derived carbon in fossil fuel-derived polyethylene terephthalate produced using fossil fuel-derived ethylene glycol and fossil fuel-derived dicarboxylic acid is 0%, and the biomass degree of fossil fuel-derived polyethylene terephthalate is 0%.

[0038] In addition, when the "biomass degree" is expressed by the weight ratio of the biomass-derived component, the "biomass degree" can be calculated as follows. For example, in the case of polyethylene terephthalate, as described above, polyethylene terephthalate is a polymer of ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms in a molar ratio of 1:1. Therefore, when only biomass-derived ethylene glycol is used, the weight ratio of the biomass-derived component in the polyester is about 30%, so the biomass degree is about 30%. In addition, the weight ratio of the biomass-derived component in the fossil fuel-derived polyester produced using fossil fuel-derived ethylene glycol and fossil fuel-derived dicarboxylic acid is 0%, and the biomass degree of the fossil fuel-derived polyester is 0%. Hereinafter, unless otherwise specified, the "biomass degree" refers to the weight ratio of the biomass-derived component.

[0039] When the base film 22 contains a biomass-derived component, the biomass ratio in the base film 22 is 5% or more, preferably 10% to 30%, and more preferably 15% to 25%. If the biomass ratio in the base film 22 is 5% or more, the amount of polyester derived from fossil fuels can be reduced compared to conventional methods, thereby reducing the environmental burden.

[0040] Biomass-derived ethylene glycol is made from ethanol (biomass ethanol) produced from biomass as a raw material. For example, biomass-derived ethylene glycol can be obtained by a method of producing ethylene glycol from biomass ethanol via ethylene oxide using a conventionally known method. Commercially available biomass ethylene glycol may also be used, and for example, biomass ethylene glycol commercially available from India Glycoal Limited can be suitably used.

[0041] The dicarboxylic acid unit of the biomass polyester uses a dicarboxylic acid derived from a fossil fuel. As the dicarboxylic acid, aromatic dicarboxylic acids, aliphatic dicarboxylic acids, and derivatives thereof can be used without limitation. As the aromatic dicarboxylic acid, terephthalic acid and isophthalic acid can be mentioned, and as the derivative of the aromatic dicarboxylic acid, lower alkyl esters of aromatic dicarboxylic acids, specifically, methyl esters, ethyl esters, propyl esters, butyl esters, and the like can be mentioned. Among these, terephthalic acid is preferred, and as the derivative of the aromatic dicarboxylic acid, dimethyl terephthalate is preferred.

[0042] In addition, specific examples of the aliphatic dicarboxylic acid include linear or alicyclic dicarboxylic acids having 2 to 40 carbon atoms, such as oxalic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, dodecanedioic acid, dimer acid, and cyclohexanedicarboxylic acid. In addition, examples of the derivatives of the aliphatic dicarboxylic acids include lower alkyl esters such as methyl esters, ethyl esters, propyl esters, and butyl esters of the above aliphatic dicarboxylic acids, and cyclic acid anhydrides of the above aliphatic dicarboxylic acids, such as succinic anhydride. Among these, adipic acid, succinic acid, dimer acid, or a mixture thereof is preferred, and those containing succinic acid as the main component are particularly preferred. Examples of the derivatives of the aliphatic dicarboxylic acid include methyl esters of adipic acid and succinic acid, or a mixture thereof. These dicarboxylic acids can be used alone or in combination of two or more.

[0043] The biomass polyester may be a copolymer polyester in which a copolymer component is added as a third component in addition to the above diol component and dicarboxylic acid component. Specific examples of the copolymer component include bifunctional oxycarboxylic acid, and at least one polyfunctional compound selected from the group consisting of trifunctional or more polyhydric alcohols, trifunctional or more polyvalent carboxylic acids and / or their anhydrides, and trifunctional or more oxycarboxylic acids to form a crosslinked structure. Among these copolymer components, bifunctional and / or trifunctional or more oxycarboxylic acids are particularly preferably used because they tend to easily produce copolymer polyesters with a high degree of polymerization. Among them, the use of trifunctional or more oxycarboxylic acids is most preferred because it allows easy production of polyesters with a high degree of polymerization with a very small amount without using a chain extender described later.

[0044] Biomass polyester can be obtained by a conventionally known method of polycondensing the above-mentioned diol unit and dicarboxylic acid unit. Specifically, it can be produced by a general melt polymerization method in which the above-mentioned dicarboxylic acid component and diol component are subjected to an esterification reaction and / or transesterification reaction, followed by a polycondensation reaction under reduced pressure, or a known solution heating dehydration condensation method using an organic solvent. The amount of diol used in producing biomass polyester is substantially equimolar to 100 moles of dicarboxylic acid or its derivative, but in general, it is preferable to use an excess amount of 0.1 mol% to 20 mol% because distillation occurs during the esterification and / or transesterification reaction and / or condensation polymerization reaction.

[0045] The base film 22 can be formed by forming a film using a resin composition of biomass polyester or a resin composition containing biomass polyester and a polyester derived from a fossil fuel, for example, by a T-die method. Specifically, after drying the above-mentioned resin composition, the resin composition is supplied to a melt extruder heated to a temperature of Tm or higher to Tm+70°C to melt the resin composition, and extruded into a sheet from a die such as a T-die, and the extruded sheet is quenched and solidified by a rotating cooling drum, etc., to form the base film 22. As the melt extruder, a single-screw extruder, a twin-screw extruder, a vent extruder, a tandem extruder, etc. can be used depending on the purpose.

[0046] Biomass polyethylene is a monomer polymer containing ethylene derived from biomass. Details of biomass polyethylene will be described in the description of the sealant layer 40.

[0047] When the base film 22 is formed from a material that does not contain biomass-derived components, for example, a plastic film such as a polyester film such as a polyethylene terephthalate film or polybutylene terephthalate, a polyolefin film such as a polyethylene film or polypropylene film, a polyamide film such as a nylon film or a nylon 6 / metaxylylenediamine nylon 6 co-extruded co-stretched film, or a polypropylene / ethylene-vinyl alcohol copolymer co-extruded co-stretched film, or a composite film in which two or more of these films are laminated, can be used as the base film 22. The plastic film may be coated with polyvinyl alcohol or the like.

[0048] The base film 22 may be a stretched plastic film stretched in a predetermined direction. In this case, the base film 22 may be a uniaxially stretched film stretched in one predetermined direction, or a biaxially stretched film stretched in two predetermined directions. The stretched plastic film is obtained, for example, by heating a plastic film extruded onto a cooling drum with roll heating, infrared heating, or the like, and stretching it in the longitudinal direction. This stretching is preferably performed by utilizing the peripheral speed difference between two or more rolls. The longitudinal stretching is usually performed in a temperature range of 50°C or more and 100°C or less. In addition, the longitudinal stretching ratio is preferably 2.5 times or more and 4.2 times or less, depending on the required characteristics of the film application. If the stretching ratio is less than 2.5 times, the thickness unevenness of the film becomes large, making it difficult to obtain a good film.

[0049] The longitudinally stretched film is then subjected to the sequential processes of transverse stretching, heat setting, and heat relaxation to become a biaxially stretched film. Transverse stretching is usually performed at a temperature range of 50°C to 100°C. The transverse stretching ratio is preferably 2.5 times to 5.0 times, depending on the required properties of the application. If it is less than 2.5 times, the film thickness becomes uneven and it is difficult to obtain a good film, and if it exceeds 5.0 times, breakage is likely to occur during film formation.

[0050] The breaking strength of the base film 22 is, for example, 5 kg / mm 2 More than 40kg / mm 2 Below, 5kg / mm ​​in TD direction 2 More than 35kg / mm 2 The elongation at break is, for example, 50% to 350% in the MD direction and 50% to 300% in the TD direction. The shrinkage percentage when left in a temperature environment of 150° C. for 30 minutes is, for example, 0.1% to 5%.

[0051] When the base film 22 is a biomass polyester film or a polyester film, the thickness of the base film 22 is preferably 6 μm or more and 20 μm or less, and more preferably 12 μm or more and 16 μm or less. When the base film 22 is a polyamide film, the thickness of the base film 22 is preferably 10 μm or more and 30 μm or less, and more preferably 15 μm or more and 25 μm or less. When the base film 22 is a polypropylene film, the thickness of the base film 22 is preferably 15 μm or more and 50 μm or less, and more preferably 20 μm or more and 30 μm or less. When the base film 22 is a biomass polyethylene film or a polyethylene film, the thickness of the base film 22 is preferably 10 μm or more and 80 μm or less, and more preferably 30 μm or more and 60 μm or less.

[0052] The base film 22 may be a single-layer film or a co-extruded film of two or more layers.

[0053] (Printing layer) The printing layer 50 is a layer formed by printing for decoration, display of contents, display of expiration date, display of manufacturer, seller, etc., and for imparting aesthetics. The printing layer 50 includes a pattern layer that forms any desired pattern such as a picture, a photograph, a letter, a number, a figure, a symbol, a pattern, etc. The printing layer may further include a background color layer formed by printing to highlight the pattern of the pattern layer. The printing layer 50 includes a colorant and a cured product of a polyol and an isocyanate compound. The printing layer 50 includes a biomass-derived component. Specifically, the printing layer 50 can be formed using a cured product in which at least one of the polyol as the main agent and the isocyanate compound as the curing agent includes a biomass-derived component. As the polyol, a polyester polyol, which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, or a polyether polyol, which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate, can be used.

[0054] [Polyester polyol] When the polyester polyol contains a biomass-derived component, at least one of the polyfunctional alcohol and the polyfunctional carboxylic acid contains a biomass-derived component. The following are examples of polyester polyols containing a biomass-derived component. Reaction product of biomass-derived polyfunctional alcohol and biomass-derived polyfunctional carboxylic acid Reaction products of polyfunctional alcohols derived from fossil fuels and polyfunctional carboxylic acids derived from biomass Reaction products of biomass-derived polyfunctional alcohols and fossil fuel-derived polyfunctional carboxylic acids

[0055] As the biomass-derived polyfunctional alcohol, an aliphatic polyfunctional alcohol obtained from a plant raw material such as corn, sugarcane, cassava, or sago palm can be used. As the biomass-derived aliphatic polyfunctional alcohol, for example, polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG), diethylene glycol (DEG), butylene glycol (BG), hexamethylene glycol, etc., which are obtained from a plant raw material by the following method, can be used. These may be used alone or in combination.

[0056] Biomass-derived polypropylene glycol is produced by a fermentation method in which glucose is obtained by decomposing plant raw materials, via 3-hydroxypropylaldehyde (HPA) from glycerol. Compared with polypropylene glycol produced by the EO production method, polypropylene glycol produced by a biomethod such as the fermentation method is preferable in terms of safety, since useful by-products such as lactic acid can be obtained, and the production cost can be kept low. Biomass-derived butylene glycol can be produced by producing glycol from plant raw materials, fermenting the resulting succinic acid, and then hydrogenating the resulting succinic acid. Biomass-derived ethylene glycol can be produced, for example, from bioethanol obtained by a conventional method via ethylene.

[0057] As the polyfunctional alcohol derived from fossil fuel, a compound having two or more, preferably two to eight hydroxyl groups in one molecule can be used. Specifically, as the polyfunctional alcohol derived from fossil fuel, there is no particular limitation and a conventionally known substance can be used. For example, polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG), diethylene glycol (DEG), butylene glycol (BG), hexamethylene glycol, triethylene glycol, dipropylene glycol, 1,4-cyclohexanedimethanol, trimethylolpropane, glycerin, 1,9-nonanediol, 3-methyl-1,5-pentanediol, polyether polyol, polycarbonate polyol, polyolefin polyol, acrylic polyol, etc. can be used. These may be used alone or in combination of two or more.

[0058] As the biomass-derived polyfunctional carboxylic acid, aliphatic polyfunctional carboxylic acids obtained from plant raw materials such as plant-derived oils that can be reproduced, such as soybean oil, linseed oil, tung oil, coconut oil, palm oil, castor oil, and the like, and regenerated oils obtained by recycling waste edible oils mainly composed of these can be used. As the biomass-derived aliphatic polyfunctional carboxylic acid, for example, sebacic acid, succinic acid, phthalic acid, adipic acid, glutaric acid, dimer acid, and the like can be mentioned. For example, sebacic acid is produced by subjecting ricinoleic acid obtained from castor oil to alkaline pyrolysis, with heptyl alcohol being a by-product. In the present invention, it is particularly preferable to use succinic acid derived from biomass or sebacic acid derived from biomass. These may be used alone or in combination of two or more kinds.

[0059] As the polyfunctional carboxylic acid derived from fossil fuel, an aliphatic polyfunctional carboxylic acid or an aromatic polyfunctional carboxylic acid can be used. As the aliphatic polyfunctional carboxylic acid derived from fossil fuel, there is no particular limitation and a conventionally known substance can be used, for example, adipic acid, dodecanedioic acid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, maleic anhydride, itaconic anhydride, sebacic acid, succinic acid, glutaric acid, and dimer acid, as well as ester compounds thereof. As the aromatic polyfunctional carboxylic acid derived from fossil fuel, there is no particular limitation and a conventionally known substance can be used, for example, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, phthalic anhydride, trimellitic acid, and pyromellitic acid, as well as ester compounds thereof. These may be used alone or in combination of two or more.

[0060] [Polyether polyol] When the polyether polyol contains a biomass-derived component, at least one of the polyfunctional alcohol and the polyfunctional isocyanate contains a biomass-derived component. Examples of polyether polyols containing a biomass-derived component include the following. Reaction product of biomass-derived polyfunctional alcohol and biomass-derived polyfunctional isocyanate -Reaction product of polyfunctional alcohol derived from fossil fuels and polyfunctional isocyanate derived from biomass Reaction product of biomass-derived polyfunctional alcohol and fossil fuel-derived polyfunctional isocyanate

[0061] As the biomass-derived polyfunctional alcohol and the fossil fuel-derived polyfunctional alcohol, the biomass-derived polyfunctional alcohol and the fossil fuel-derived polyfunctional alcohol described above in relation to the polyester polyol can be used.

[0062] As the biomass-derived polyfunctional isocyanate, a product obtained by converting a plant-derived divalent carboxylic acid into a terminal amino group by acid amidation and reduction, and then reacting with phosgene to convert the amino group into an isocyanate group can be used. The biomass-derived polyfunctional isocyanate is, for example, a biomass-derived diisocyanate. Examples of the biomass-derived diisocyanate include dimer acid diisocyanate (DDI), octamethylene diisocyanate, and decamethylene diisocyanate. In addition, a plant-derived diisocyanate can also be obtained by using a plant-derived amino acid as a raw material and converting its amino group into an isocyanate group. For example, lysine diisocyanate (LDI) can be obtained by methyl esterifying the carboxyl group of lysine, and then converting the amino group into an isocyanate group. In addition, 1,5-pentamethylene diisocyanate can be obtained by decarboxylating the carboxyl group of lysine, and then converting the amino group into an isocyanate group.

[0063] Other synthesis methods for 1,5-pentamethylene diisocyanate include the phosgenation method and the carbamate method. More specifically, the phosgenation method is a method of directly reacting 1,5-pentamethylene diamine or its salt with phosgene, or a method of suspending pentamethylene diamine hydrochloride in an inert solvent and reacting it with phosgene to synthesize 1,5-pentamethylene diisocyanate. The carbamate method is a method of first carbamatizing 1,5-pentamethylene diamine or its salt to generate pentamethylene dicarbamate (PDC), which is then thermally decomposed to synthesize 1,5-pentamethylene diisocyanate. In the present invention, a polyisocyanate that is preferably used is 1,5-pentamethylene diisocyanate-based polyisocyanate (trade name: STABIO (registered trademark)) manufactured by Mitsui Chemicals, Inc.

[0064] The fossil fuel-derived polyfunctional isocyanate is not particularly limited, and conventionally known substances can be used. For example, aromatic diisocyanates such as toluene-2,4-diisocyanate, 4-methoxy-1,3-phenylene diisocyanate, 4-isopropyl-1,3-phenylene diisocyanate, 4-chloro-1,3-phenylene diisocyanate, 4-butoxy-1,3-phenylene diisocyanate, 2,4-diisocyanate diphenyl ether, 4,4'-methylenebis(phenylene isocyanate) (MDI), jurylene diisocyanate, tolidine diisocyanate, xylylene diisocyanate (XDI), 1,5-naphthalene diisocyanate, benzidine diisocyanate, o-nitrobenzidine diisocyanate, and 4,4'-diisocyanate dibenzyl can be mentioned. Other examples include aliphatic diisocyanates such as methylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, and 1,10-decamethylene diisocyanate; and alicyclic diisocyanates such as 1,4-cyclohexylene diisocyanate, 4,4-methylenebis(cyclohexyl isocyanate), 1,5-tetrahydronaphthalene diisocyanate, isophorone diisocyanate, hydrogenated MDI, and hydrogenated XDI. These may be used alone or in combination of two or more.

[0065] [Coloring Agent] The colorant is not particularly limited, and any conventionally known pigment or dye can be used.

[0066] When the printed layer 50 contains a biomass-derived component, the printed layer 50 preferably has a biomass degree of 5% or more, more preferably 5% to 50%, and even more preferably 10% to 50%. If the biomass degree is within the above range, the amount of fossil fuel used can be reduced, and the environmental load can be reduced.

[0067] The weight of the printed layer 50 after drying is preferably 0.1 g / m 2 More than 10g / m 2 Less than 1 g / m, more preferably 2 More than 5g / m 2More preferably, 1 g / m or less 2 More than 3g / m 2 The following is the result.

[0068] The printing layer 50 preferably has a thickness of 0.1 μm or more and 10 μm or less, more preferably 1 μm or more and 5 μm or less, and even more preferably 1 μm or more and 3 μm or less.

[0069] (adhesive layer) The adhesive layer 30 is a layer that functions to bond the printed layer 50 and the sealant layer 40 that constitute the packaging material 10. In addition, when a barrier layer 60 such as a deposition layer is included between the adhesive layer 30 and the sealant layer 40, it goes without saying that the adhesive layer 30 functions to bond the printed layer 50 and the barrier layer 60. The adhesive layer 30 includes a cured product of a polyol and an isocyanate compound. The adhesive layer 30 may use a conventionally known polyol and isocyanate compound derived from fossil fuels, but by using at least one of the polyol and the isocyanate compound that contains a biomass-derived component, the amount of fossil fuel used can be further reduced, and the environmental load can be reduced.

[0070] In the adhesive layer 30, the isocyanate compound containing a biomass-derived component can be the same as that in the printed layer 50. In addition, in the adhesive layer 30, the polyol containing a biomass-derived component can be the same as that in the printed layer 50. When both the printed layer 50 and the adhesive layer 30 are formed using a cured product containing a biomass-derived component, the cured product in the printed layer 50 and the cured product in the adhesive layer 30 may have the same composition or different compositions.

[0071] The adhesive layer preferably has a biomass ratio of 5% or more, more preferably 5% to 50%, and even more preferably 30% to 50%. If the biomass ratio is within the above range, the amount of fossil fuel used can be reduced, and the environmental load can be reduced.

[0072] The dry weight of the adhesive layer is preferably 0.1 g / m 2 More than 10g / m 2 Less than 1 g / m, more preferably 2 More than 6g / m 2 More preferably, 2 g / m or less 2 More than 5g / m 2 The following is the result.

[0073] The adhesive layer preferably has a thickness of 0.1 μm or more and 10 μm or less, more preferably 1 μm or more and 6 μm or less, and even more preferably 2 μm or more and 5 μm or less.

[0074] (Sealant layer) The sealant film 42 of the sealant layer 40 constitutes the inner surface 10x of the packaging material 10. The sealant film 42 of the sealant layer 40 may or may not contain a biomass-derived component. When the sealant layer 40 is formed from a material containing a biomass-derived component, the sealant layer 40 can be formed from the following biomass polyolefin. When the sealant layer 40 is formed from a material not containing a biomass-derived component, the sealant layer 40 can be formed from a conventionally known thermoplastic resin derived from fossil fuels.

[0075] Biomass polyolefin is a polymer of monomers containing olefins such as ethylene derived from biomass. Since biomass-derived olefins are used as the raw material monomers, the polyolefins obtained by polymerization are derived from biomass. Note that the raw material monomers for polyolefins do not have to contain 100% by mass of biomass-derived olefins.

[0076] 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 a plant raw material. The plant raw material is not particularly limited, and any conventionally known plant can be used. Examples of the plant raw material include corn, sugarcane, beet, and manioc.

[0077] Fermented ethanol derived from biomass refers to ethanol produced by contacting a culture solution containing a carbon source obtained from a plant raw material with an ethanol-producing microorganism or a product derived from its crushed material, and then purifying the ethanol. Conventionally known methods such as distillation, membrane separation, and extraction can be used to purify ethanol from the culture solution. For example, methods include adding benzene, cyclohexane, etc., and removing water by azeotropy or membrane separation.

[0078] The monomers that are the raw material for the biomass polyolefin may further include ethylene monomers derived from fossil fuels and / or α-olefin monomers derived from fossil fuels, or may further include α-olefin monomers derived from biomass.

[0079] The number of carbon atoms of the above-mentioned α-olefin is not particularly limited, but one having 3 to 20 carbon atoms can usually be used, and butylene, hexene, or octene is preferable. This is because butylene, hexene, or octene can be produced by polymerization of ethylene, which is a raw material derived from biomass. In addition, by including such an α-olefin, the polyolefin obtained by polymerization has an alkyl group as a branched structure, and therefore can be more flexible than a simple linear one.

[0080] As the biomass polyolefin, polyethylene or a copolymer of ethylene and α-olefin may be used alone or in combination of two or more. In particular, the biomass polyolefin is preferably polyethylene. This is because the use of ethylene, which is a raw material derived from biomass, makes it theoretically possible to produce the polyolefin from 100% biomass-derived components.

[0081] The biomass polyolefin may contain two or more kinds of biomass polyolefins having different biomass degrees, and it is sufficient that the biomass degree of the entire polyolefin resin layer falls within the range described below.

[0082] The biomass polyolefin preferably has a viscosity of 0.91 g / cm 3 More than 0.93g / cm 3 Less than or equal to 0.912 g / cm 3 More than 0.928g / cm 3 More preferably, 0.915 g / cm 3 More than 0.925g / cm 3 The density of the biomass polyolefin is a value measured according to the method A of JIS K7112-1980 after annealing as described in JIS K6760-1995. The density of the biomass polyolefin is 0.91 g / cm 3 If the density of the biomass polyolefin is 0.93 g / cm or more, the rigidity of the polyolefin resin layer containing the biomass polyolefin can be increased, and the polyolefin resin layer can be suitably used as an inner layer of a packaging product. 3 If the content is below this level, the transparency and mechanical strength of the polyolefin resin layer containing biomass polyolefin can be increased, and the polyolefin resin layer can be suitably used as an inner layer of a packaging product.

[0083] The biomass polyolefin has a melt flow rate (MFR) of 0.1 g / 10 min to 10 g / 10 min, preferably 0.2 g / 10 min to 9 g / 10 min, more preferably 1 g / 10 min to 8.5 g / 10 min. The melt flow rate is a value measured by the A method under the conditions of a temperature of 190° C. and a load of 21.18 N in the method specified in JIS K7210-1995. If the MFR of the biomass polyolefin is 0.1 g / 10 min or more, the extrusion load during molding can be reduced. In addition, if the MFR of the biomass polyolefin is 10 g / 10 min or less, the mechanical strength of the polyolefin resin layer containing the biomass polyolefin can be increased.

[0084] A suitable biomass polyolefin is a biomass-derived low-density polyethylene (product name: SBC818, density: 0.918 g / cm) manufactured by Braskem. 3, MFR: 8.1 g / 10 min, biomass content 95%), Braskem biomass-derived low-density polyethylene (product name: SPB681, density: 0.922 g / cm 3 , MFR: 3.8g / 10min, biomass content 95%), Braskem biomass-derived linear low-density polyethylene (product name: SLL118, density: 0.916g / cm 3 , MFR: 1.0 g / 10 min, biomass ratio 87%).

[0085] Examples of the thermoplastic resin derived from fossil fuels include low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, and ionomer.

[0086] The sealant layer may be formed by dry laminating a sealant film on the printed layer on the substrate layer side via an adhesive layer, or by extruding the above-mentioned thermoplastic resin on the adhesive layer side to form a film by melt extrusion lamination. When the melt extrusion lamination method is adopted, an anchor coat layer may be formed by applying an anchor coat agent to the surface of the adhesive layer and drying it. The anchor coat agent may be any resin having a heat resistance temperature of 135°C or higher, such as an anchor coat agent made of vinyl modified resin, epoxy resin, urethane resin, polyester resin, polyethyleneimine, etc., but in particular, an anchor coat agent which is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups in the structure and an isocyanate compound as a curing agent can be preferably used. In addition, a silane coupling agent may be used in combination with this as an additive, and nitrocellulose may be used in combination to increase heat resistance.

[0087] 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 or more and 10 μm or less, preferably 2 μm or more and 5 μm or less. The adhesive resin layer has a thickness of preferably 5 μm or more and 50 μm or less, preferably 10 μm or more and 30 μm or less.

[0088] The sealant layer 40 preferably has a biomass degree of 5% or more, more preferably 5% to 60%, and even more preferably 10% to 60%. If the biomass degree is within the above range, the amount of fossil fuel used can be reduced, and the environmental load can be reduced. Note that the above biomass degree is a value shown as a weight ratio, but it can also be shown as a value measured by measuring the content of carbon derived from biomass by radiocarbon (C14) measurement. That is, the proportion of carbon derived from biomass can be calculated by measuring the proportion of C14 contained in the total carbon atoms in the sealant layer. The content of C14 in the sealant layer is expressed as P C14 The content of carbon derived from biomass, P bio As above, the following formula is used: P bio (%)=P C14 / 105.5×100 The biomass content of polyethylene produced using ethylene, a biomass-derived raw material, is the same whether expressed as a weight ratio or as a value measured to determine the amount of biomass-derived carbon determined by radiocarbon (C14) measurement.

[0089] The sealant layer 40 may be a single layer or a multilayer. When the sealant layer uses the biomass polyolefin as described above, the sealant layer may have three layers: an inner layer, an intermediate layer, and an outer layer. In this case, it is preferable that the intermediate layer is made of a biomass polyolefin or a biomass polyolefin and a conventionally known polyolefin derived from fossil fuels, and the inner layer and the outer layer are made of conventionally known polyolefin derived from fossil fuels.

[0090] The sealant layer 40 has a thickness of preferably 10 μm or more and 300 μm or less, more preferably 20 μm or more and 200 μm or less, and even more preferably 30 μm or more and 150 μm or less.

[0091] (Barrier layer) Between the substrate layer and the print layer and / or between the adhesive layer and the sealant layer, layers other than those described above, such as a barrier layer, may be provided. As the barrier layer, a metal foil or an inorganic or inorganic oxide vapor deposition layer can be suitably used.

[0092] (Metal foil) As the metal foil constituting the barrier layer, a conventionally known metal foil can be used. Aluminum foil is preferable in terms of gas barrier properties that prevent the transmission of oxygen gas and water vapor, and light blocking properties that prevent the transmission of visible light and ultraviolet rays. In addition, it is possible to impart metallic luster to the packaging bag, thereby improving the design. The thickness of the metal foil is, for example, 5 μm or more and 15 μm or less.

[0093] (deposited layer) The vapor-deposited layer 60 is a vapor-deposited film made of an inorganic substance and / or an inorganic oxide. The vapor-deposited film can be formed by a conventionally known method using a conventionally known inorganic substance or inorganic oxide, and the composition and the method of formation are not particularly limited. The packaging material 10 may have two or more vapor-deposited layers 60. When the packaging material 10 has two or more vapor-deposited layers 60, each layer may have the same composition or different compositions.

[0094] The deposition layer 60 may be, for example, a deposition film of an inorganic substance or an inorganic oxide such as silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), or yttrium (Y).

[0095] The vapor-deposited film of an inorganic oxide such as silicon oxide or aluminum oxide has transparency. When the vapor-deposited layer 60 is located closer to the outer surface 10y than the printed layer 50, a vapor-deposited film of an inorganic oxide having transparency is used as the vapor-deposited layer 60.

[0096] Inorganic oxides are expressed as, for example, SiO X , AlO X MO X (wherein, M represents an inorganic element, and the range of the value of X varies depending on the inorganic element). The range of the value of X is as follows: silicon (Si) is 0-2, aluminum (Al) is 0-1.5, magnesium (Mg) is 0-1, calcium (Ca) is 0-1, potassium (K) is 0-0.5, tin (Sn) is 0-2, sodium (Na) is 0-0.5, boron (B) is 0-1.5, titanium (Ti) is 0-2, lead (Pb) is 0-1, zirconium (Zr) is 0-2, and yttrium (Y) is 0-1.5. In the above, when X=0, it is a completely inorganic element (pure substance) and is not transparent, and the upper limit of the range of X is the value when it is completely oxidized. Silicon (Si) and aluminum (Al) are preferably used for the vapor deposition layer 60 of the packaging material 10, and silicon (Si) with a value in the range of 1.0 to 2.0 and aluminum (Al) with a value in the range of 0.5 to 1.5 can be used.

[0097] The thickness of the above-mentioned inorganic substance or inorganic oxide vapor deposition film varies depending on the type of inorganic substance or inorganic oxide used, but it is desirable to select and form the film within the range of, for example, 50 Å to 2000 Å, preferably 100 Å to 1000 Å. More specifically, in the case of an aluminum vapor deposition film, the film thickness is desirably 50 Å to 600 Å, more preferably 100 Å to 450 Å, and in the case of an aluminum oxide or silicon oxide vapor deposition film, the film thickness is desirably 50 Å to 500 Å, more preferably 100 Å to 300 Å.

[0098] The deposition layer 60 can be formed on the base layer 20, the sealant layer 40, etc., by using the following formation methods. Examples of the formation method of the deposition layer 60 include physical vapor deposition methods (PVD methods) such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition methods (CVD methods) such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition.

[0099] (Gas barrier coating film) The gas barrier coating film is a film that is provided on the deposition layer as necessary. The gas barrier coating film functions as a layer that suppresses the permeation of oxygen gas, water vapor, etc. The gas barrier coating film is a film represented by the general formula R 1 n M(OR 2 ) m (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 the atomic valence of M. The gas barrier composition contains at least one alkoxide represented by the formula (I) and the above-mentioned polyvinyl alcohol resin and / or ethylene-vinyl alcohol copolymer, and is further polycondensed by a sol-gel method in the presence of a sol-gel catalyst, an acid, water, and an organic solvent.

[0100] The above general formula R 1 n M(OR 2 ) m As the alkoxide represented by the formula (I), at least one of the following may be used: partial hydrolysis product of alkoxide, and condensation product of hydrolysis of alkoxide. In addition, the partial hydrolysis product of alkoxide does not need to have all alkoxy groups hydrolyzed, and may be one in which one or more alkoxy groups are hydrolyzed, or a mixture thereof. As the condensation product of hydrolysis of alkoxide, a dimer or more of the partially hydrolyzed alkoxide, specifically, a dimer to hexamer, is used.

[0101] The above general formula R 1 n M(OR 2 ) m In the alkoxide represented by the formula (I), silicon, zirconium, titanium, aluminum, and the like can be used as the metal atom represented by M. In this embodiment, preferred metals include, for example, silicon and titanium. In the present invention, the alkoxide can be used alone or in the form of a mixture of two or more different metal atoms in the same solution.

[0102] In addition, the above general formula R 1 n M(OR 2 ) m In the alkoxide represented by the formula: 1 Specific examples of the organic group represented by the general formula R include alkyl groups such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, t-butyl, n-hexyl, n-octyl, and the like. 1 n M(OR 2 ) m In the alkoxide represented by the formula: 2 Specific examples of the organic group represented by the formula (1) include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a sec-butyl group, etc. In addition, these alkyl groups may be the same or different in the same molecule.

[0103] When preparing the gas barrier composition, for example, a silane coupling agent may be added. As the silane coupling agent, a known organoalkoxysilane containing an organic reactive group may be used. In this embodiment, in particular, an organoalkoxysilane having an epoxy group is preferably used, and specifically, for example, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, or β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane may be used. The silane coupling agents as described above may be used alone or in combination of two or more.

[0104] <Manufacturing methods for packaging materials> Next, an example of a method for producing the laminate that constitutes the packaging material 10 will be described.

[0105] First, the above-mentioned base material layer 20 is prepared. The base material layer 20 is provided in advance with a printed layer 50. Furthermore, the base material layer 20 may include a barrier layer 60 such as a deposition layer or a gas barrier coating film, as necessary.

[0106] Next, by dry lamination, the printed layer 50 side of the base material layer 20 and the sealant layer 40 are laminated via the adhesive layer 30. In this way, a packaging material 10 including the base material layer 20, the printed layer 50, the adhesive layer 30, and the sealant layer 40 can be obtained.

[0107] In the dry lamination method, first, an adhesive composition is applied to one of the two films to be laminated. Then, the applied adhesive composition is dried to volatilize the solvent. Then, the two films are laminated via the dried adhesive composition. Then, the two laminated films are wound up and aged, for example, in an environment of 20°C or higher for 24 hours or more.

[0108] The packaging material 10 can be subjected to secondary processing for the purpose of imparting surface functions such as chemical functions, electrical functions, magnetic functions, mechanical functions, friction / wear / lubrication functions, optical functions, thermal functions, and biocompatibility. Examples of secondary processing include embossing, painting, adhesion, printing, metallizing (plating, etc.), machining, and surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, coating, etc.). In addition, the packaging material according to the present invention can be subjected to lamination (dry lamination and extrusion lamination), bag making, and other post-treatment processes to manufacture molded products.

[0109] <Packaging products> Examples of packaging products formed by using the packaging material include packaging bags, laminated tubes, lid materials, sheet molded products, label materials, and the like.

[0110] The packaging product including the packaging material can be suitably used as packaging for various foods and beverages such as food and beverages, fruit juice, juice, drinking water, alcohol, cooked foods, fish paste products, frozen foods, meat products, stews, rice cakes, liquid soups such as soup for hot pots, seasonings, liquid detergents, cosmetics such as shampoos, rinses, and conditioners, hygiene products, daily necessities, and chemical products. Specific examples of foods and beverages include coffee, coffee beans, coffee powder, ice cream, gummies, side dishes, pasta sauce, curry, jelly, bacon, chocolate, and chocolate paste. Specific examples of daily necessities include absorbent cotton, masks, bath salts, and powdered milk. In addition, as exemplified in the examples described later, the packaging product including the packaging material 10 configured to have heat resistance can be used in applications for containing contents that are to be subjected to heat sterilization treatment such as retort treatment and boiling treatment. Note that the retort treatment is a treatment in which the packaged product is filled with the contents and sealed, and then the packaged product is heated under pressure using steam or heated hot water. The temperature of the retort treatment is, for example, 120° C. or higher. The boiling treatment is a treatment in which the packaged product is filled with the contents, sealed, and then heated in hot water under atmospheric pressure. The temperature of the boiling treatment is, for example, 90° C. or higher and 100° C. or lower.

[0111] The packaging bag for the packaged product can be produced by folding the packaging material 10 in half, or by preparing two sheets of the packaging material 10, overlapping the sealant layer 40 of the front packaging material 10 with the sealant layer 40 of the back packaging material 10 facing each other, and heat sealing the peripheral edge of the material 10 by a heat seal type such as a side seal type, a two-sided seal type, a three-sided seal type, a four-sided seal type, an envelope seal type, a grooving seal type (pillow seal type), a pleated seal type, a flat bottom seal type, or a square bottom seal type. Also, a gusset-type packaging bag can be produced by inserting the folded packaging material 10 between the front packaging material 10 and the back packaging material 10 and heat sealing the material 10. All of the packaging materials 10 constituting the packaging bag do not have to be the packaging materials 10 according to the present invention. In other words, it is sufficient that at least a portion of the packaging material 10 constituting the packaging bag is a packaging material 10 having an adhesive layer containing a biomass-derived component, and the other portion of the packaging material 10 constituting the packaging bag may be a packaging material 10 having an adhesive layer derived from fossil fuels.

[0112] The heat sealing can be performed by any known method, such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high frequency sealing, ultrasonic sealing, etc.

[0113] Fig. 5 is a diagram showing an example of a packaging bag 70 including packaging material 10. Bag 70 includes surface film 74 forming the surface, back film 75 forming the back, and lower film 76 forming lower portion 72. Lower film 76 is disposed between surface film 74 and back film 75 in a state where it is folded back at folded-back portion 76f. Thus, packaging bag 70 shown in Fig. 5 is a self-supporting standing pouch with the lower portion configured as a gusset portion.

[0114] The inner surfaces of the front film 74, the back film 75, and the lower film 76 are joined together by a seal portion. In a front view of the packaging bag 70 such as FIG. 5, the seal portion is hatched. As shown in FIG. 5, the seal portion has an outer edge seal portion extending along the outer edge of the packaging bag 70. The outer edge seal portion includes a lower seal portion 72a that spreads to the lower portion 72, and a pair of side seal portions 73a that extend along a pair of side portions 73. In the packaging bag 70 before the contents are filled (a state in which the contents are not filled), as shown in FIG. 5, the upper portion 71 of the bag 70 is an opening 71b. After the contents are placed in the packaging bag 70, the inner surface of the front film 74 and the inner surface of the back film 75 are joined at the upper portion 71 to form an upper seal portion, and the packaging bag 70 is sealed.

[0115] The above-mentioned terms "front film", "back film" and "lower film" merely divide each film according to its positional relationship, and the above-mentioned terms do not limit the method of providing the packaging material 10 when manufacturing the packaging bag 70. For example, the packaging bag 70 may be manufactured using one packaging material 10 in which the front film 74, the back film 75 and the lower film 76 are continuously arranged, or may be manufactured using a total of two packaging materials 10, that is, one packaging material 10 in which the front film 74 and the lower film 76 are continuously arranged and one back film 75, or may be manufactured using a total of three packaging materials 10, that is, one front film 74, one back film 75 and one lower film 76.

[0116] At least one of the front film 74, the back film 75, and the lower film 76 is made of the packaging material 10 having an adhesive layer containing a biomass-derived component. This makes it possible to reduce the amount of fossil fuel used compared to conventional methods, thereby reducing the environmental burden.

[0117] Fig. 6 is a diagram showing another example of a packaging bag 70 including a packaging material 10. The packaging bag 70 shown in Fig. 6 is substantially the same as the packaging bag 70 shown in Fig. 5 except that it further includes a steam release mechanism 80. In the packaging bag 70 shown in Fig. 6, the same parts as those in the packaging bag 70 shown in Fig. 5 are denoted by the same reference numerals and detailed description thereof will be omitted.

[0118] 6, packaging bag 70 includes a steam vent mechanism 80 for releasing steam generated when the contents stored in storage section 77 are heated to the outside. Steam vent mechanism 80 is configured to communicate between the inside and outside of packaging bag 70 to release steam when the steam pressure reaches or exceeds a predetermined value, and to suppress steam from escaping from places other than steam vent mechanism 80.

[0119] 6, the steam release mechanism 80 has a steam release seal portion 81 that protrudes from the side seal portion 73a toward the inside of the packaging bag 70, and an unsealed portion 82 that is isolated from the containing portion 77 by the steam release seal portion 81. The unsealed portion 82 is in communication with the outside of the packaging bag 70. When the pressure in the containing portion 77 increases due to heating in a microwave oven or the like, the steam release seal portion 81 peels off. Steam in the containing portion 77 can escape to the outside of the packaging bag 70 through the peeled portion of the steam release seal portion 81 and the unsealed portion 82.

[0120] The configuration of the steam release mechanism 80 is not limited to the configuration shown in Fig. 6. The configuration of the steam release mechanism 80 is arbitrary as long as it can communicate between the containing section 77 and the outside of the packaging bag 70 when the steam pressure reaches or exceeds a predetermined value.

[0121] 6, at least one of the front film 74, the back film 75, and the lower film 76 is made of the packaging material 10 having an adhesive layer containing a biomass-derived component. This makes it possible to reduce the amount of fossil fuel used compared to conventional methods, thereby reducing the environmental impact.

[0122] Fig. 7 is a diagram showing another example of a packaging bag 70 including a packaging material 10. The packaging bag 70 shown in Fig. 7 is substantially the same as the packaging bag 70 shown in Fig. 5 except that it further includes a spout portion 85. In the packaging bag 70 shown in Fig. 7, the same parts as those in the packaging bag 70 shown in Fig. 5 are denoted by the same reference numerals and detailed description thereof will be omitted.

[0123] As shown in Fig. 7, packaging bag 70 is a portion through which the contents contained in storage section 77 pass when the contents are removed. In this case, the contents are a liquid having flowability. The width of spout section 85 is narrower than the width of storage section 77. Therefore, the user can accurately determine the pouring direction of the contents poured from packaging bag 70 through spout section 85.

[0124] 7, the spout portion 85 is formed by a part of the front film 74 and the back film 75. For example, the spout portion 85 includes a spout seal portion 86 that joins the front film 74 and the back film 75 to define the spout portion 85 having a width narrower than that of the storage portion 77. The packaging bag 70 having such a spout portion 85 is suitably used as a refill pouch that contains contents such as detergent, shampoo, and conditioner to be refilled into a bottle.

[0125] As long as the content can be appropriately poured, the configuration of the pouring outlet part 85 is not limited to the configuration shown in Fig. 7. For example, the pouring outlet part 85 may be a member, such as a spout, separate from the front film 74 and the back film 75.

[0126] 7, at least one of the front film 74, the back film 75, and the lower film 76 is made of the packaging material 10 having an adhesive layer containing a biomass-derived component. This makes it possible to reduce the amount of fossil fuel used compared to conventional methods, thereby reducing the environmental impact.

[0127] Fig. 8 is a diagram showing another example of a packaging bag 70 including the packaging material 10. The packaging bag 70 shown in Fig. 8 is a four-sided sealed pouch formed by joining a front film 74 and a back film 75 at four sides along the outer edge. Note that, in the upper part 71, an upper seal portion is formed after the contents are placed in the packaging bag 70 through the opening 71b, as in the case of the examples shown in Figs. 5 to 7.

[0128] 8, at least one of the front film 74 and the back film 75 is made of the packaging material 10 having an adhesive layer containing a biomass-derived component. This makes it possible to reduce the amount of fossil fuel used compared to conventional methods, thereby reducing the environmental impact.

[0129] Although not shown, the packaging bag 70 may be a three-sided sealed pouch formed by joining the front film 74 and the back film 75 on three sides along the outer edge. Also, although not shown, the packaging bag 70 may be a pillow pouch joined at the upper portion 71, the lower portion 72, and the seam portion.

[0130] 9 is a diagram showing an example of a lidded container 90 including the packaging material 10. The lidded container 90 includes a container body 92 produced by sheet forming such as drawing, and a lid portion 94 joined to the container body 92.

[0131] 9, for example, a container body 92 is produced by drawing a packaging material 10 having an adhesive layer containing a biomass-derived component. This makes it possible to reduce the amount of fossil fuel used compared to conventional methods, thereby reducing the environmental burden.

[0132] 9, the lid 94 may be formed of the packaging material 10 having an adhesive layer containing a biomass-derived component. This makes it possible to reduce the amount of fossil fuel used compared to conventional methods, thereby reducing the environmental impact.

[0133] <Other aspects> Another aspect of the present invention is a packaging material including at least a base layer, a printed layer, an adhesive layer, and a sealant layer, wherein the adhesive layer is in contact with the sealant layer, the printed layer includes a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound includes a biomass-derived component. In the packaging material according to another aspect of the present invention, the polyol in the printed layer may be a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid. In the packaging material according to another aspect of the present invention, at least one of the polyfunctional alcohol and the polyfunctional carboxylic acid in the printed layer may contain a biomass-derived component. In the packaging material according to another aspect of the present invention, the polyol in the printed layer may be a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate. In the packaging material according to another aspect of the present invention, at least one of the polyfunctional alcohol and the polyfunctional isocyanate in the printed layer may contain a biomass-derived component. In the packaging material according to another aspect of the present invention, the isocyanate compound of the printed layer may contain a biomass-derived component. In the packaging material according to another aspect of the present invention, the base layer may have a base film comprising polyester, polyamide or polyolefin. In the packaging material according to another aspect of the present invention, the base film may contain a biomass polyester having ethylene glycol derived from biomass as a diol unit and a dicarboxylic acid derived from a fossil fuel as a dicarboxylic acid unit. In the packaging material according to another aspect of the present invention, the sealant layer may contain polyolefin, which is a polymer of a monomer containing olefin. In the packaging material according to another aspect of the present invention, the sealant layer may contain a biomass polyolefin, which is a polymer of a monomer containing ethylene derived from biomass. Another aspect of the present invention is a packaging product comprising the packaging material described above. EXAMPLES

[0134] Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the description of the following examples as long as it does not depart from the gist of the present invention.

[0135] [Example 1A] A biaxially stretched PET film (thickness 12 μm) derived from fossil fuel was prepared as the base film 22 of the base layer 20. Then, a printed layer 50 was formed on the inner surface of the PET film using an ink containing a biomass-derived component. In the process of forming the printed layer 50, a polyester polyol, which is a reaction product of a polyfunctional alcohol containing a biomass-derived component and a polyfunctional carboxylic acid derived from a fossil fuel, was first prepared as the base material. In addition, an isocyanate compound derived from a fossil fuel was prepared as the curing agent. Then, a colorant was added to the cured product of the polyester polyol containing a biomass-derived component and the isocyanate compound derived from a fossil fuel to obtain an ink. Then, the ink was applied in a predetermined pattern to the inner surface of the polypropylene film to form the printed layer 50.

[0136] The sealant film 42 of the sealant layer 40 was a polyethylene film 1 produced as follows. First, a linear low-density polyethylene (density: 0.918 g / cm3) derived from fossil fuels was used. 3 , MFR: 3.8g / 10min, biomass content: 0%), and 90 parts by mass of fossil fuel-derived low-density polyethylene (density: 0.924g / cm 310 parts by mass of polyethylene terephthalate (MFR: 2.0 g / 10 min, biomass degree: 0%) was melt-kneaded to obtain a resin composition. Next, the obtained resin composition was formed into a film using a top-blowing air-cooled inflation co-extrusion film-forming machine to obtain a single-layer polyethylene film (biomass degree: 0%) for the sealant layer. The polyethylene film thus produced is also referred to as polyethylene film 1. The thickness of the polyethylene film 1 was set to 30 μm. Next, the base film 22 on which the print layer 50 was formed and the sealant film 42 were bonded together by a dry lamination method using an adhesive layer 30 made of a component derived from fossil fuel to obtain a packaging material 10. The adhesive layer 30 has a cured product of a polyether polyol (base agent) obtained by reacting a polyfunctional alcohol derived from fossil fuel with a polyfunctional isocyanate derived from fossil fuel, and an isocyanate compound (curing agent) derived from fossil fuel.

[0137] The layer structure of the packaging material 10 of this embodiment is expressed as follows. PET12 / Bio-mark / Adhesive / PE(1)30 The " / " indicates the boundary between layers. The leftmost layer is the layer that constitutes the outer surface of the packaging material 10, and the rightmost layer is the layer that constitutes the inner surface of the packaging material 10. "PET" means fossil fuel derived biaxially oriented PET film. "Bio-print" refers to a printed layer that includes biomass-derived components. "Adhesive" refers to a fossil fuel-based adhesive layer. "PE(1)" refers to the polyethylene film 1 described above. The numbers indicate the layer thickness (unit: μm).

[0138] [Example 1B] The packaging material 10 was produced in the same manner as in Example 1A, except that the polyester polyol, which is the main component of the printed layer 50, was a reaction product of a fossil fuel-derived polyfunctional alcohol and a polyfunctional carboxylic acid containing a biomass-derived component.

[0139] [Example 1C] The packaging material 10 was produced in the same manner as in Example 1A, except that the polyester polyol, which is the main component of the printed layer 50, was a reaction product of a fossil fuel-derived polyfunctional alcohol and a fossil fuel-derived polyfunctional carboxylic acid, and the isocyanate compound, which is the curing agent, was an isocyanate compound containing a biomass-derived component.

[0140] In Examples 1A to 1C, one of the three components of the printed layer, the polyfunctional alcohol or polyfunctional carboxylic acid used in the polyester polyol base, or the isocyanate compound used in the curing agent, is a biomass-derived component, but the present invention is not limited to this. For example, two of the three components may contain a biomass-derived component, or all of the three components may contain a biomass-derived component.

[0141] [Example 1D] The packaging material 10 was produced in the same manner as in Example 1A, except that polyether polyol was used as the base material for the printed layer 50. Specifically, a reaction product of a polyfunctional alcohol containing a biomass-derived component and a polyfunctional isocyanate derived from a fossil fuel was used as the polyether polyol base material for the printed layer 50. In addition, an isocyanate compound derived from a fossil fuel was used as the curing agent for the printed layer 50.

[0142] [Example 1E] The packaging material 10 was produced in the same manner as in Example 1D, except that the polyether polyol, which is the main component of the printed layer 50, was a reaction product of a fossil fuel-derived multifunctional alcohol and a multifunctional isocyanate containing a biomass-derived component.

[0143] [Example 1F] The packaging material 10 was produced in the same manner as in Example 1D, except that the polyether polyol, which is the main component of the printed layer 50, was a reaction product of a fossil fuel-derived polyfunctional alcohol and a fossil fuel-derived polyfunctional isocyanate, and the isocyanate compound, which is the curing agent of the printed layer 50, was an isocyanate compound containing a biomass-derived component.

[0144] [Example 1G] A packaging material 10 was produced in the same manner as in Example 1A, except that a material containing a biomass-derived component was used as the adhesive layer 30. Specifically, a polyether polyol, which is a reaction product of a multifunctional alcohol containing a biomass-derived component and a multifunctional isocyanate derived from a fossil fuel, was used as the main agent of the adhesive layer 30. In addition, an isocyanate compound derived from a fossil fuel was used as the curing agent of the adhesive layer 30.

[0145] The layer structure of the packaging material 10 of this embodiment is expressed as follows. PET12 / Bio-marked / Bio-bonded / PE(1)30 "Bio-adhesive" refers to an adhesive layer that includes components derived from biomass.

[0146] [Example 1H] The packaging material 10 was produced in the same manner as in Example 1G, except that the polyether polyol, which is the main component of the adhesive layer 30, was a reaction product of a fossil fuel-derived multifunctional alcohol and a multifunctional isocyanate containing a biomass-derived component.

[0147] [Example 1I] The packaging material 10 was produced in the same manner as in Example 1G, except that the polyether polyol, which is the main component of the adhesive layer 30, was a reaction product of a fossil fuel-derived polyfunctional alcohol and a fossil fuel-derived polyfunctional isocyanate, and the isocyanate compound, which is the curing agent of the adhesive layer 30, was an isocyanate compound containing a biomass-derived component.

[0148] In Examples 1G to 1I, one of the three components of the adhesive layer, the polyfunctional alcohol or polyfunctional isocyanate used in the polyester polyol base, or the isocyanate compound used in the curing agent, is a biomass-derived component, but the present invention is not limited to this. For example, two of the three components may contain a biomass-derived component, or all of the three components may contain a biomass-derived component.

[0149] In Examples 1D to 1I, the adhesive layer shown in Examples 1B to 1F may be used as the printed layer in addition to the adhesive layer shown in Example 1A.

[0150] [Example 1J] A packaging material 10 was produced in the same manner as in Example 1G, except that a biaxially stretched PET film (thickness: 12 μm) containing a biomass-derived component was used as the base film 22.

[0151] The layer structure of the packaging material 10 of this embodiment is expressed as follows. Bio PET 12 / Bio mark / Bio adhesive / PE(1)30 "Bio-PET" refers to PET film derived from biomass.

[0152] [Example 1K] A packaging material 10 was produced in the same manner as in Example 1G, except that a polyethylene film 2 produced as described below was used as the sealant film 42 of the sealant layer 40. A method for producing the polyethylene film 2 will be described. First, linear low-density polyethylene (density: 0.918 g / cm3) derived from fossil fuels was used. 3 , MFR: 3.8g / 10min, biomass content: 0%), and 60 parts by mass of fossil fuel-derived low-density polyethylene (density: 0.924g / cm 3 20 parts by mass of biomass-derived linear low-density polyethylene (LLDPE, manufactured by Braskem, product name: SLL118, density: 0.916 g / cm3 20 parts by mass of polyethylene film (biomass degree: 87%) was melt-kneaded with 20 parts by mass of polyethylene film (biomass degree: 87%). The resin composition was then formed into a film using a top-blowing air-cooled inflation co-extrusion film-forming machine to obtain a single-layer polyethylene film 2 for a sealant layer (biomass degree: 16%). The thickness of the polyethylene film 2 was 30 μm, the same as in the case of the polyethylene film 1 of Example 1A.

[0153] The layer structure of the packaging material 10 of this embodiment is expressed as follows. PET12 / Bio-marked / Bio-bonded / PE(2)30 "PE(2)" refers to the polyethylene film 2 described above.

[0154] [Example 1L] The packaging material 10 was produced in the same manner as in Example 1G, except that a biaxially stretched PET film (thickness 12 μm) containing biomass-derived components was used as the base film 22, and the above-mentioned polyethylene film 2 was used as the sealant film 42 of the sealant layer 40.

[0155] The layer structure of the packaging material 10 of this embodiment is expressed as follows. Bio PET 12 / Bio mark / Bio adhesive / PE(2)30

[0156] In Examples 1J to 1L, the printed layer may be the printed layer shown in Examples 1B to 1F instead of the printed layer shown in Example 1A. Also, the adhesive layer may be the adhesive layer shown in Examples 1A to 1I instead of the adhesive layer shown in Example 1G.

[0157] The layer structures of the packaging materials 10 of Examples 1A to 1L are shown together in Figure 10. In the "Type of adhesive layer" column of Figure 10, the entry "Ether-based" means that the main agent used in the adhesive layer is polyether polyol. In addition, in the column "Biomass-derived components in the adhesive layer," the entry "polyfunctional alcohol" means that at least the polyfunctional alcohol of the main agent among the main agent and curing agent components used in the adhesive layer is derived from biomass. Similarly, the entry "isocyanate compound" means that at least the isocyanate compound of the curing agent among the main agent and curing agent components used in the adhesive layer is derived from biomass. In addition, in the column "Biomass-derived components in the adhesive," the entry "-" means that the adhesive layer does not contain any biomass-derived components.

[0158] Similarly, in the column "Type of Printed Layer", the description "Ether-based" means that the base agent used in the printed layer is polyether polyol. Also, the description "Ester-based" means that the base agent used in the printed layer is polyester polyol. Also, in the column "Biomass-derived components in the printed layer", the description "polyfunctional alcohol" means that at least the polyfunctional alcohol of the base agent and the curing agent used in the printed layer is derived from biomass. Similarly, the description "polyfunctional carboxylic acid" means that at least the polyfunctional carboxylic acid of the base agent and the curing agent used in the printed layer is derived from biomass. Similarly, the description "isocyanate compound" means that at least the isocyanate compound of the curing agent of the base agent and the curing agent used in the printed layer is derived from biomass.

[0159] [Example 2A] A fossil fuel-derived biaxially oriented polypropylene film (thickness: 20 μm) was prepared as the base film 22 of the base layer 20. Next, a printed layer 50 was formed on the inner surface of the polypropylene film using the same ink as that used in Example 1A.

[0160] Also, a polyethylene film 1 having a thickness of 25 μm was prepared as the sealant film 42 of the sealant layer 40. Next, the base film 22 on which the printed layer 50 was formed and the sealant film 42 were bonded together by a dry lamination method using the same adhesive as that used in Example 1A to obtain the packaging material 10.

[0161] The layer structure of the packaging material 10 of this embodiment is expressed as follows. OPP20 / Bio-mark / Connection / PE(1)25 "OPP" means fossil fuel derived biaxially oriented polypropylene film.

[0162] [Example 2B] A packaging material 10 was produced in the same manner as in Example 2A, except that a polypropylene film having a vapor deposition layer of an inorganic oxide and a gas barrier coating film located on the vapor deposition layer was used as the base film 22, which was a biaxially oriented polypropylene film (thickness 20 μm) derived from fossil fuels.

[0163] The layer structure of the packaging material 10 of this embodiment is expressed as follows. Barrier OPP20 / Bio-mark / Adhesive / PE(1)25 "Barrier OPP" refers to a polypropylene film in which a vapor-deposited layer of inorganic oxide and a gas barrier coating film are provided on a biaxially oriented polypropylene film derived from fossil fuels.

[0164] [Example 3] A packaging material 10 was produced in the same manner as in Example 1A, except that a polypropylene film (thickness 20 μm) derived from fossil fuels on which a metal vapor deposition layer was provided was used as the sealant film 42.

[0165] The layer structure of the packaging material 10 of this embodiment is expressed as follows. PET12 / Bio-print / Adhesive / VMCPP20 "VMCPP" means a fossil fuel-derived biaxially oriented polypropylene film having a metal vapor deposited thereon.

[0166] [Example 4] A packaging material 10 was produced in the same manner as in Example 2A, except that a polypropylene film (thickness 25 μm) derived from fossil fuels on which a metal vapor deposition layer was provided was used as the sealant film 42.

[0167] The layer structure of the packaging material 10 of this embodiment is expressed as follows. OPP20 / Bio-seal / Seal / VMCPP25

[0168] [Example 5] A packaging material 10 was produced in the same manner as in Example 1A, except that a fossil fuel-derived polypropylene film (thickness: 20 μm) was used as the sealant film 42.

[0169] The layer structure of the packaging material 10 of this embodiment is expressed as follows. PET12 / Bio-mark / Adhesive / CPP20

[0170] [Example 6A] A packaging material 10 was produced in the same manner as in Example 2A, except that a fossil fuel-derived polypropylene film (thickness: 20 μm) was used as the sealant film 42.

[0171] The layer structure of the packaging material 10 of this embodiment is expressed as follows. OPP20 / Bio-mark / Seal / CPP20

[0172] [Example 6A] A packaging material 10 was produced in the same manner as in Example 2B, except that a fossil fuel-derived polypropylene film (thickness: 20 μm) was used as the sealant film 42.

[0173] The layer structure of the packaging material 10 of this embodiment is expressed as follows. Barrier OPP20 / Bio-mark / Adhesive / CPP20

[0174] [Example 7] A packaging material 10 was produced in the same manner as in Example 1A, except that a nylon film (thickness 60 μm) derived from fossil fuels was used as the sealant film 42.

[0175] The layer structure of the packaging material 10 of this embodiment is expressed as follows. PET20 / Bio-mark / Adhesive / CNY60 "CNY" stands for fossil fuel-derived nylon film.

[0176] [Example 8] The packaging material 10 was produced in the same manner as in Example 1A, except that the base film 22 was a fossil fuel-derived biaxially stretched PET film (thickness 12 μm) having a vapor deposition layer of an inorganic oxide and a gas barrier coating film located on the vapor deposition layer, and the sealant film 42 was a fossil fuel-derived polypropylene film (thickness 25 μm).

[0177] The layer structure of the packaging material 10 of this embodiment is expressed as follows. IB-PET12 / Bio-stamp / Adhesive / CPP25 "IB-PET" refers to a PET film provided with a vapor-deposited layer of an inorganic oxide and a gas barrier coating film located on the vapor-deposited layer.

[0178] [Example 9] A packaging material 10 was produced in the same manner as in Example 8, except that a polyethylene film 1 having a thickness of 40 μm was used as the sealant film 42.

[0179] The layer structure of the packaging material 10 of this embodiment is expressed as follows. IB-PET12 / Bio-mark / Attachment / PE(1)40

[0180] In the packaging materials of Examples 2A to 9 described above, the printed layer may be any of the printed layers shown in Examples 1B to 1F other than that used in Example 1A. Also, the adhesive layer may be any of the variations shown in Examples 1B to 1L other than that used in Example 1A.

[0181] [Example 10] The packaging material 10 was produced in the same manner as in Example 1A, except that a fossil fuel-derived biaxially oriented nylon film (thickness 15 μm) was used as the base film 22, a 50 μm-thick polyethylene film 1 was used as the sealant film 42, and a polyester polyol, which is a reaction product of a fossil fuel-derived multifunctional alcohol and a fossil fuel-derived multifunctional carboxylic acid, was used as the main agent for the adhesive layer 30, and an isocyanate compound derived from a fossil fuel was used as the curing agent.

[0182] The layer structure of the packaging material 10 of this embodiment is expressed as follows. ONY15 / Bio mark / Connection / PE(1)50 "ONY" means fossil fuel derived biaxially oriented nylon film.

[0183] [Example 11] The packaging material 10 was produced in the same manner as in Example 10, except that the base film 22 was a biaxially oriented nylon film (thickness 15 μm) derived from fossil fuels, which had a vapor deposition layer of an inorganic oxide and a gas barrier coating film located on the vapor deposition layer.

[0184] The layer structure of the packaging material 10 of this embodiment is expressed as follows. IB-ONY15 / Bio mark / Connection / PE(1)50 "IB-ONY" refers to a fossil fuel-derived biaxially oriented nylon film having a vapor-deposited layer of inorganic oxide and a gas barrier coating overlying the vapor-deposited layer.

[0185] In Examples 10 and 11, the printed layer may be any of the printed layers shown in Examples 1B to 1F other than that used in Example 1A. Also, the printed layer may be any of the variations shown in Examples 1B to 1L other than that used in Example 1A.

[0186] FIG. 11 shows examples of the layer configurations and types of packaging containers of the packaging materials 10 of Examples 1A and 2A to 11. [Explanation of symbols]

[0187] 10 Packaging materials 20 Base material layer 22 Base film 30 Adhesive layer 40 Sealant Layer 42 Sealant Film 50 printing layers 60 Barrier Layer

Claims

1. A packaging material comprising at least a substrate layer, a printing layer, an adhesive layer, and a sealant layer, The printed layer contains a cured product of a polyol and an isocyanate compound, and at least one of the polyol and the isocyanate compound contains a biomass-derived component; The polyol of the printing layer is a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, one of the polyfunctional alcohol and the polyfunctional carboxylic acid of the printing layer contains a biomass-derived component and the other is derived from a fossil fuel; The printing layer has a thickness of 0.1 μm or more and 10 μm or less, the adhesive layer contains a cured product of a polyol and an isocyanate compound, The polyol of the adhesive layer is a polyether polyol, which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate, the thermoplastic resin constituting the sealant layer is derived from a fossil fuel, The packaging material, wherein the thermoplastic resin comprises polypropylene or a propylene-ethylene copolymer.

2. The packaging material of claim 1 , wherein the isocyanate compound of the printed layer comprises a biomass-derived component.

3. The packaging material according to claim 1 or 2, wherein the substrate layer comprises a substrate film comprising polyester, polyamide or polyolefin.

4. The packaging material according to claim 3 , wherein the base film contains a biomass polyester having ethylene glycol derived from biomass as a diol unit and a dicarboxylic acid derived from a fossil fuel as a dicarboxylic acid unit.

5. A packaging product comprising a packaging material according to any one of claims 1 to 4.

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